Flame retardant material and preparation method and product thereof

Abstract

The present application discloses a flame retardant material and a preparation method and product thereof. The flame retardant material comprises a thermoplastic polymer, a reinforcing material, a composite flame retardant, and includes a phosphorus-containing flame retardant and polysiloxane. The mass ratio of the thermoplastic polymer, the reinforcing material, the phosphorus-containing flame retardant, the polysiloxane, the antioxidant and the lubricant is (30-80): (10-50): (0.4-12): (2-20); the structural formula of the polysiloxane is: [(R 1 ) 2 (R 2 )SiO 1 / 2 ] a ·[(R 3 ) 3 SiO 1 / 2 ] b ·[SiO 4 / 2 ] c , (a+b):c=(0.4-1):1. The flame retardant material disclosed in the present application can suppress the dripping phenomenon during combustion under thin-wall conditions and achieve a thin-wall flame retardant grade of V-0.

Description

Technical Field

[0001] The present application relates to the field of materials, and in particular to a flame retardant material capable of achieving a thin-wall flame retardancy grade of V0, a ​​preparation method of the flame retardant material, and a product manufactured based on the flame retardant material. Background Art

[0002] Engineering plastics (e.g., thermoplastic polymers) are widely used in injection molded products in the fields of automobiles, electronic appliances, etc. Glass fibers can enhance the performance of thermoplastic polymers, such as achieving excellent properties such as high strength, high rigidity, high heat resistance, and good dimensional stability of thermoplastic polymers, and therefore have been widely used in the fields of home appliances, consumer electronics, medical devices, etc. Among them, the self-coking ability during combustion and excellent ductility make polycarbonate particularly suitable for the consumer electronics industry. However, the consumer electronics industry increasingly requires lighter and thinner designs that can achieve their desired flame retardant ratings and generally requires products to be halogen-free. In the prior art solutions, PTFE is generally used as an anti-drip agent to achieve the V-0 rating. Perfluoro and polyfluoroalkyl substances (PFAS) are considered permanent chemicals that can persist in the environment and are almost non-biodegradable. They are not only easily harmful to the environment, but also easily accumulate in the food chain and cause potential health effects on organisms. In electronic devices, trends such as lightweight and thin and PFAS regulations have put forward higher requirements for the flame retardant properties of engineering plastics. How to achieve thin-wall flame retardancy and no dripping under fluorine-free conditions has become an important issue to be solved. Summary of the invention

[0003] In order to solve the above problems, the present application discloses a flame retardant material and a preparation method thereof and a product obtained based on the flame retardant material. The flame retardant material can suppress dripping during combustion under thin-wall conditions and achieve a 0.6mm flame retardant grade of V-0.

[0004] The first aspect of the present application discloses a flame retardant material. The flame retardant material may include: a thermoplastic polymer; a reinforcing material; and a composite flame retardant, including a phosphorus-containing flame retardant and polysiloxane; wherein the mass ratio of the thermoplastic polymer, the reinforcing material, the phosphorus-containing flame retardant, and the polysiloxane is (30-80): (10-50): (4-12): (0.4-20); the structural formula of the polysiloxane may be expressed as: [(R 1 ) 2 (R 2 )SiO 1 / 2 ] a ·[(R 3 ) 3 SiO 1 / 2 ] b ·[SiO 4 / 2 ] c ; Among them, R1 , R 2 and R 3 The same or different, each independently comprises an alkyl or substituted alkyl group containing no more than 30 carbon atoms, an alkenyl or substituted alkenyl group containing no more than 30 carbon atoms, an alkynyl or substituted alkynyl group containing no more than 30 carbon atoms, and / or an aryl or substituted aryl group containing no more than 30 carbon atoms. Wherein, the relationship between a, b and c can satisfy (a+b):c=(0.4-1):1. The polysiloxane has a high silicon content and is easily transferred to the surface of the polycarbonate resin at the initial stage of combustion to form a dense and stable silicon-containing carbon layer, which can not only insulate heat and oxygen to block the further combustion reaction, but also prevent the internal decomposition of combustibles from overflowing. Wherein the ratio of a, b, and c controls the network structure of the polysiloxane, achieving flame retardancy without reducing the mechanical properties of glass fiber reinforced polycarbonate. It forms a good synergistic effect with phosphorus-based flame retardants to achieve a thin-walled V-0 flame retardant grade of fluorine-free formula.

[0005] According to some embodiments of the present application, the thermoplastic polymer may include a mixture of linear homopolycarbonate and branched polycarbonate; the mass ratio of the linear homopolycarbonate to the branched polycarbonate is (0.05-0.5): 1; the melt index of the linear homopolycarbonate is 1-40g / 10min, and the melt index of the branched polycarbonate is 2-15g / 10min. The traditional anti-drip agent PTFE has a large molecular weight, and it is fibrous under the shear force of the screw to form a network structure, thereby playing an anti-drip role. By compounding branched and linear polycarbonates, a small amount of linear molecular chains are mixed in a large number of high molecular weight branched molecular chains (low melt index branched polycarbonate), so that the molecular chains are entangled with each other, forming a network structure locally, improving the melt strength and improving the dripping phenomenon during combustion, and the traditional anti-drip agent PTFE is not environmentally friendly.

[0006] According to some embodiments of the present application, the thermoplastic polymer may contain at least 30% recycled material.

[0007] According to some embodiments of the present application, the reinforcing material may include one or more of a glass fiber composite, a carbon fiber, and a metal fiber. The carbon fiber may contain at least 30% recycled material. By using recycled material, petrochemical resources can be saved and it is environmentally friendly.

[0008] The glass fiber composition may include flat glass fiber and round glass fiber, and the mass ratio of the flat glass fiber to the round glass fiber is 1:(0.05-0.3); the flatness ratio of the flat glass fiber is 1:3-1:4, and the diameter of the round glass fiber is 7-13 microns. Thin-walled electronic devices have high requirements on the size and flatness of the products. Due to its flat structure, the difference in shrinkage between the flow direction and the vertical direction of the flat glass fiber during the injection molding process is small, and a low warping effect can be achieved. However, its fluidity is relatively high, and it is easy to cause dripping and ignition during the combustion process. A small amount of round glass fiber is introduced and interspersed among the highly oriented flat glass fibers to hinder the rapid flow of the PC resin melt along the flat glass fibers, avoiding the dripping and ignition phenomenon caused by it, while maintaining the original low warping and mechanical properties of the flat glass fibers.

[0009] According to some embodiments of the present application, the phosphorus-containing flame retardant can be selected from one or more phosphazene compounds and / or one or more phosphate compounds; wherein the mass ratio of the phosphazene compound to the phosphate compound is 1:(3-11).

[0010] According to some embodiments of the present application, the phosphazene compound can be hexaphenoxycyclotriphosphazene, and the phosphate compound can be bisphenol A bis(phenyl phosphate) and / or resorcinol bis(diphenyl phosphate). During the combustion process, the burning time after leaving the fire is too long to only reach the V-1 level, and it will also increase the risk of dripping and ignition. When using phosphate compounds alone, the combustion process of thin-walled parts is prone to take more than 10 seconds. Introducing a small amount of phosphazene compounds, through phosphorus-phosphorus compounding, can effectively reduce the burning time and reduce the probability of dripping and ignition.

[0011] According to some embodiments of the present application, the structural formula of the polysiloxane is: [(CH 3 ) 2 (CH 2 =CH)SiO 1 / 2 ] a ·[(CH 3 ) 3 SiO 1 / 2 ] b ·[SiO 4 / 2 ] c .

[0012] According to some embodiments of the present application, the flame retardant material may further include an antioxidant, and the antioxidant may include one or more of antioxidant 168 , antioxidant 1010 , and antioxidant 1098 .

[0013] According to some embodiments of the present application, the flame retardant material may further include a lubricant, and the lubricant may include one or more of calcium stearate, stearic acid, ethylene bisstearamide, pentaerythritol stearate, silicone powder, and polyethylene wax.

[0014] The second aspect of the present application provides a method for preparing the flame retardant material as described above, and the preparation method may include: placing the components in a mixing device and mixing them evenly to obtain a mixture according to the mass ratio of the components of the flame retardant material; using an extrusion device to extrude the mixture into strips, and transferring them to a granulation device for granulation, and obtaining the flame retardant material after post-processing.

[0015] A third aspect of the present application provides a product, which can be made of the flame retardant material as described above.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The words "include" or "comprises" and the like used herein mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "and / or" or "and / or" used herein include any and all combinations of one or more related listed items.

[0019] The flame retardant material disclosed in the present application, by using a combination of thermoplastic polymer with excellent anti-dripping performance, glass fiber and composite flame retardant, achieves the suppression of dripping phenomenon during combustion under thin-wall conditions, and reaches a flame retardant grade of 0.6mm V-0. At the same time, the flame retardant material disclosed in the present application does not contain an anti-dripping agent, and the composition does not contain halogen (especially fluorine), which ensures high performance while being environmentally friendly.

[0020] Some preferred embodiments of the present application are described below. It should be noted that the following description is for the purpose of illustration and is not intended to limit the scope of protection of the present application. The steps involved in the present application can be performed accurately in sequence, or various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or one or more operations can be removed from these processes.

[0021] The present application discloses a flame retardant material, which may be composed of a glass fiber reinforced thermoplastic polymer combined with a composite flame retardant (the composite flame retardant is a composition composed of a phosphorus-based flame retardant and polysiloxane).

[0022] The thermoplastic polymer may include a combination of one or more substances, for example, it may be a mixture of one or more of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyamide (PA), polycarbonate (PC), polyetheretherketone (PEEK), etc. The above polymers may also be homopolymers (e.g., linear polymers, branched / hyperbranched polymers, etc.), or copolymers (e.g., random copolymers, alternating copolymers, periodic copolymers, statistical copolymers, block copolymers, regular block copolymers, stereoblock copolymers, tapered copolymers and / or graft copolymers, etc.). A suitable but non-limiting thermoplastic polymer may be polycarbonate. Exemplarily, the polycarbonate can be bisphenol A polycarbonate (BPA-PC), bisphenol S polycarbonate (BPS-PC), bisphenol TMC polycarbonate, aliphatic polycarbonate, aromatic-aliphatic copolycarbonate, poly(1,4-cyclohexanedimethanol) carbonate (PCHC), silicon-containing polycarbonate, poly(hydroquinone) carbonate, poly(resorcinol) carbonate, poly(2,2,4,4-tetramethyl-1,3-cyclobutanediol) carbonate, phosphorus-containing polycarbonate, etc.

[0023] In some embodiments, the polycarbonate may be prepared based on a bisphenol compound. Some suitable but non-limiting bisphenol compounds may include 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), 4,4'-dihydroxydiphenyl sulfone (bisphenol S), bis(4-hydroxyphenyl)methane (bisphenol F), 1,1-bis(4-hydroxyphenyl)cyclohexane (bisphenol Z), 1,1-bis(4-hydroxyphenyl)-4-isopropylcyclohexane (bisphenol C), 1,1-bis(4-hydroxyphenyl)-1-phenylethane (bisphenol AP), 4,4'-(1,3-phenyldiisopropyl)diphenol (bisphenol M), 4,4'-(1,4-phenyldiisopropyl)diphenol (bisphenol P), 1,1-bis(4 -hydroxy-3-methylphenyl)cyclohexane (bisphenol TMC), 4,4'-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, 3,3'-dihydroxybiphenyl, 4,4'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenylmethane, 2,2'-dihydroxydiphenylmethane, 4,4'-dihydroxydiphenylethane, 4,4'-dihydroxydiphenylpropane, 4,4'-dihydroxydiphenylbutane, 4,4'-dihydroxydiphenylpentane, 4,4'-dihydroxydiphenylhexane, 4,4'-dihydroxydiphenylheptane, 4,4'-dihydroxydiphenyloctane, 4,4'-dihydroxydiphenylnonane, 4 ,4'-dihydroxydiphenyldecane, 1,4-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxy-3-methylphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)cycloheptane, 1,1-bis(4-hydroxyphenyl)cyclooctane, 9,9-bis(4-hydroxyphenyl)fluorene, 4,4'-dihydroxydiphenyl sulfone, 3,3'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfide, 3,3'-dihydroxydiphenyl sulfide, 4,4'-dihydroxybenzophenone, 2,2'-dihydroxydiphenyl ketone, 4,4'-dihydroxyphenylethylene, 4,4'-dihydroxytolane, 4,4'-dihydroxybenzaldehyde, 4,4'-dihydroxybenzhydrol, 4,4'-dihydroxybenzethanol, 4,4'-dihydroxybenzpropanol, 4,4'-dihydroxybenzbutanol, 4,4'-dihydroxybenzenopentanol, 4,4'-dihydroxybenzenehexanol, 4,4'-dihydroxybenzeneheptanol, 4,4'-dihydroxybenzeneoctanol, 4,4'-dihydroxybenzenenonanol, 4,4'-dihydroxybenzenedecyl alcohol, 4,4'-dihydroxybenzenethione, 4,4'-dihydroxybenzenesulfone, 4,4'-dihydroxybenzenesulfone ether, etc. 3,3-bis(4-hydroxyphenyl)benzopyrrolone, 2-phenyl-3,3-bis(4-hydroxyphenyl)benzopyrrolone, etc. The functional groups contained in the above bisphenol compounds, such as alkyl groups, may also contain heteroatoms, such as oxygen, nitrogen, sulfur, silicon, phosphorus, etc.

[0024] In some embodiments, the polycarbonate can be obtained based on bisphenol A. For example, bisphenol A and phosgene are used to perform an interfacial polycondensation reaction in a two-phase system to obtain bisphenol A polycarbonate. Exemplary steps may include dissolving bisphenol A in an aqueous sodium hydroxide solution, mixing the solution with an organic solvent containing phosgene (such as dichloromethane, 1,2-dichloroethane, chlorobenzene, toluene, etc.), polycondensation reaction at the interface of the two phases under stirring conditions, separation of the organic phase after the reaction is completed, washing and drying, and evaporation of the solvent to obtain bisphenol A polycarbonate. Subsequent optional polycondensation can obtain a polymer with a higher molecular weight. Of course, melt transesterification polycondensation or non-phosgene melt transesterification polycondensation can also be used to obtain bisphenol A polycarbonate. In the process of preparing the polycarbonate, a capping agent can also be used to control and improve the molecular weight and properties of the polymer. Such as monophenol compounds (such as phenol, 4-tert-butylphenol, 4-isooctylphenol, 4-dodecylphenol, 4-phenylphenol, etc. are used to improve stability and heat resistance), phenolic compounds (such as 2,4-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol (BHT), 2,6-di-tert-butylphenol, etc. are used to improve thermal stability, enhance antioxidant properties and improve yellowing resistance), ester compounds (such as 4-tert-butylbenzoic acid, methyl 4-tert-butylbenzoate, benzoic acid, methyl benzoate, etc. are used to improve hydrolysis resistance and improve thermal stability Qualitative), long-chain alkylphenol compounds (such as nonylphenol, dodecylphenol, octadecylphenol, etc. for improving weather resistance), epoxy compounds (such as phenyl glycidyl ether, p-tert-butylphenyl glycidyl ether, etc. for improving weather resistance and improving hydrolysis resistance), phosphate compounds (such as triphenyl phosphate, tris (2,6-dimethylphenyl) phosphate, etc. for improving flame retardancy and increasing thermal stability), multifunctional compounds (such as 4-hydroxybenzoic acid methyl ester, 4-hydroxyacetophenone, etc. for providing multiple functionalities) can be used as end-capping agents. In addition, thioether carbonyl end-capping agents such as the formula GC (= O) -LSR can also be used. Among them, G represents a leaving group, which can usually be a hydroxyl group (-OH) or other reactive groups, and L can be C 1 -C 12 Aliphatic or aromatic linking groups such as alkyl or aryl, R can be C 1 -C 30 Alkyl or aryl. Suitable but non-limiting, the thioether carbonyl end-capping agent may include but is not limited to 2-mercaptobenzoic acid, thiosalicylic acid, S-(4-hydroxyphenyl)thioacetic acid, 2-(phenylthio)acetic acid, 4-mercaptobenzoic acid methyl ester, 3,3'-thiobis(2-methylpropionic acid), 2-[(4-hydroxyphenyl)thio]benzoic acid, 4-(methylthio)benzoic acid, 2-mercapto-5-methylbenzoic acid, S-phenylthioacetic acid, etc. or any combination thereof.

[0025] In some embodiments, the polycarbonate may be a composition of a linear homopolycarbonate and a branched polycarbonate. The interfacial polycondensation method and the melt polycondensation method as described above may be used to prepare the linear homopolycarbonate. The branched polycarbonate may be prepared by adding a monomer having three or more functional groups (or a multifunctional monomer) during the synthesis of the polycarbonate (for example, using the interfacial polycondensation method). Generally speaking, the amount of the multifunctional monomer added is usually less than 5 mol% to avoid gelation. Alternatively, branching points are introduced by subsequent reaction of the hydroxyl groups at the ends of the linear polycarbonate chains to obtain branched polycarbonates. The aforementioned multifunctional monomers may be used as modifiers to react with the hydroxyl groups to form a branched structure. Alternatively, a multifunctional monomer is added to the polycarbonate in a molten state to react with the polycarbonate to obtain a branched polycarbonate. Alternatively, a precursor of a multifunctional monomer may be selected to be added to the polymerization reaction so that the multifunctional monomer is generated during the reaction and participates in the polymerization reaction to make the branching points of the branched polycarbonate more evenly distributed. Alternatively, high-energy radiation is used to induce crosslinking and branching of polycarbonate molecular chains to synthesize branched polycarbonates. For example, linear polycarbonate is irradiated with gamma rays or electron beams under controlled conditions to form a branched structure through free radical reactions. Exemplary branching agents may include, but are not limited to, polyfunctional phenolic compounds such as 1,3,5-trihydroxybenzene, tetrakis(4-hydroxyphenyl)methane, 1,1,1-tris(4-hydroxyphenyl)ethane, phloroglucinol, hydroquinone, etc., polyfunctional carboxylic acid compounds such as tricarboxybenzoic acid, citric acid, 1,2,3,4-butanetetracarboxylic acid, trimellitic anhydride, pyromellitic acid, etc., polyfunctional amine compounds such as, diethylenetriamine, triethylenetetramine, melamine, m-phenylenediamine, etc., polyfunctional isocyanate compounds such as triisocyanates (such as triglycidyl isocyanurate), polymethyl polyphenyl polyisocyanate (PAPI), polyfunctional Functional epoxy compounds such as triglycidyl isocyanurate, phenolic epoxy resin, tetrafunctional epoxy resin, multifunctional acid anhydrides such as pyromellitic anhydride, trimellitic anhydride, bismaleic anhydride, etc., multifunctional olefin compounds such as triallyl isocyanurate, pentaerythritol tetraacrylate, etc., inorganic multifunctional compounds such as multifunctional silanes (such as tetraethoxysilane), polysiloxanes, multifunctional phosphides, etc., reactive oligomers such as epoxidized polybutadiene, hydroxyl-terminated polybutadiene, multifunctional polyethers, etc., in-situ generated multifunctional compounds such as phenolic resins generated by the reaction of formaldehyde and phenols, hydrolysis products of multifunctional silanes, etc.

[0026] The branching agent used in the synthesis of branched polycarbonate may include, but is not limited to, 1,1,1-tris(4-hydroxyphenyl)ethane, tetrakis(4-hydroxyphenyl)methane, 1,3,5-trihydroxybenzene, 4,4',4''-trihydroxytriphenylmethane, phloroglucinol, hydroquinone, 2,4,6-trimethyl-2,4,6-tris(4-hydroxyphenyl)heptane-3-one, 1,3,5-tris(2-hydroxyethyl)isocyanuric acid, trimethylolpropane, pentaerythritol, dipentaerythritol, trimethylolpropane triglycidyl ether, triglycidyl isocyanurate, trihydroxybenzoic acid, 1,3,5-tris(4-hydroxyphenyl)benzene, 4,4'-di(4-hydroxyphenyl)pentanoic acid, 4,6-dimethyl-2,4,6-tris(4-hydroxyphenyl)-2-heptene, 1,1,2,2-tetrakis(4-hydroxyphenyl)ethane, 1,4 -Bis(4',4''-dihydroxytriphenylmethyl)benzene, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 4,4'-bis(3,5-dimethyl-4-hydroxyphenyl)methane, 1,3-bis(4-hydroxyphenyl)-5,5-dimethylhydantoin, tris(4-hydroxyphenyl)phosphate, 1,3,5-tris(4-hydroxyphenoxy)benzene, 4,4',4''-trihydroxyphenyl ether , 2,4,6-tris(2,4-dihydroxyphenyl)-1,3,5-triazine, 1,1,3-tris(4-hydroxyphenyl)propane, 1,3,5-tris(4-hydroxy-3-methylphenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 4,4'-bis(4,4'-dihydroxytriphenylmethyl)biphenyl, tris(4-hydroxyphenyl)cyanomethane, etc. or any combination thereof.

[0027] In some embodiments, the mass ratio of the linear homopolycarbonate to the branched carbonate may be (0.05-0.5):1. Alternatively or preferably, the mass ratio of the linear homopolycarbonate to the branched carbonate may be (0.1-0.5):1. Alternatively or preferably, the mass ratio of the linear homopolycarbonate to the branched carbonate may be (0.2-0.4):1. Alternatively or preferably, the mass ratio of the linear homopolycarbonate to the branched carbonate may be (0.25-0.35):1. Alternatively, the mass ratio of the linear homopolycarbonate to the branched carbonate may be any value within the above numerical range, for example, 0.05:1, 0.08:1, 0.17:1, 0.5:1, etc.

[0028] When a mixture of linear polycarbonate and branched polycarbonate is selected as the thermoplastic polymer, the melt index (MFR) can be used for material selection. Exemplarily, the melt index of the linear homopolycarbonate can be 1-40 g / 10 min, for example, 1 g / 10 min, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, etc. The melt index of the branched polycarbonate can be 2-15g / 10min, for example, 2g / 10min, 3g / 10min, 4g / 10min, 5g / 10min, 6g / 10min, 7g / 10min, 8g / 10min, 9g / 10min, 10g / 10min, 11g / 10min, 12g / 10min, 13g / 10min, 14g / 10min, 15g / 10min, etc. An exemplary but non-limiting selection is that the melt index of the linear homopolycarbonate is 2g / 10min or 36g / 10min, and the melt index of the branched polycarbonate is 3g / 10min, or 12g / 10min. For the melt index, the test condition can be carried out at 300°C under a pressure of 1.2kg. In the present application, the selection of the melt index of the linear polycarbonate and the branched polycarbonate has an influence on the performance of the flame retardant material. The above-mentioned limitation on the melt index enables the flame retardant material to have better performance, rather than being selected arbitrarily.

[0029] Molecular weight can also be used as selection condition.For example, the molecular weight of described linear homopolycarbonate can be 15000-30000 dalton, or 17000-28000 dalton, or 19000-25000 dalton, or 21000-22000 dalton.The molecular weight of described branched polycarbonate can be 30000-45000 dalton, or 32000-40000 dalton, or 34000-38000 dalton, or 35000-36000 dalton.

[0030] The mass fraction of the polycarbonate composed of a mixture of linear homopolycarbonate and branched polycarbonate in the flame retardant material can be 30-80wt%. Alternatively or preferably, the mass fraction of the polycarbonate in the flame retardant material can be 40-70wt%. Alternatively or preferably, the mass fraction of the polycarbonate in the flame retardant material can be 50-60wt%. Alternatively, the mass fraction of the polycarbonate in the flame retardant material can be any value in the above numerical range, such as 64.4wt%, 68.4wt%, etc.

[0031] In some embodiments, the polycarbonate may also be one of a linear homopolycarbonate or a branched polycarbonate, and the relevant characteristics / properties thereof may be as described above.

[0032] In some embodiments, the polycarbonate may include at least 30% recycled material. For example, 30%, 33%, 35%, 37%, 40%, 50%, etc. or even more. Using recycled material is not only economical but also environmentally friendly.

[0033] The reinforcing material can be used to enhance the properties of the thermoplastic polymer, including but not limited to material strength / rigidity / toughness, heat resistance, etc. For example, the reinforcing material is melt-mixed with the thermoplastic polymer such as the aforementioned polycarbonate to obtain a reinforced polycarbonate material. In some embodiments, the reinforcing material may include one or more of glass fiber, carbon fiber, mineral filler, glass beads, carbon nanotubes, aramid fiber, carbon black, metal powder, metal fiber, etc. For example, glass fiber (a composition consisting of a single type of glass fiber or a plurality of glass fibers) can be used to improve the strength, rigidity and dimensional stability of thermoplastic polymers such as polycarbonate. For another example, carbon fiber and / or carbon nanotubes can also improve the strength and thermal properties of thermoplastic polymers such as polycarbonate. For another example, metal fibers (e.g., stainless steel, copper, aluminum, nickel, chromium, etc.) also have the same / similar effects. The rest, such as talc in mineral fillers can improve stability, mica can improve rigidity and heat resistance, kaolin can increase hardness, and others such as calcium carbonate, dolomite, wollastonite, barium sulfate, silica, feldspar, barite, etc. can also participate in the reinforcement of the thermoplastic polymer to improve the performance of the flame retardant material.

[0034] In some embodiments, when carbon fiber is used as the reinforcing material, the carbon fiber may include at least 30% recycled material, for example, 30%, 33%, 35%, 37%, 40%, 50%, etc. or even more. Using recycled material is not only economical but also environmentally friendly.

[0035] In some embodiments, the reinforcing material may be a glass fiber composition. The term "glass fiber" may be regarded as an abbreviation of "glass fiber" in this application. In some embodiments, the glass fiber composition may include flat glass fiber and round glass fiber. Flat glass fiber may have an elliptical cross section or a quasi-elliptical cross section, and round glass fiber may have a solid circular cross section or a circular cross section. Materials such as quartz sand (providing silicon dioxide), feldspar (providing aluminum oxide and potassium oxide), dolomite (providing magnesium oxide and calcium oxide), limestone (providing calcium oxide), borax or boric acid (providing boron oxide), etc., combined with soda ash, saltpeter, zirconium oxide, titanium oxide, iron oxide, lithium oxide, zinc oxide, etc., can be used to prepare the above-mentioned glass fiber. Different glass fibers, such as E-glass fibers, S-glass fibers, C-glass fibers, etc., can be obtained by adjusting the raw material selection and ratio. The glass fibers used in this application can be selected based on relevant physical properties. Exemplarily, for flat glass fibers, the flatness ratio of the flat glass fibers may be 1:3-1:4, for example, the flatness ratio of the flat glass fibers may be 1:3, 1:3.1, 1:3.2, 1:3.3, 1:3.4, 1:3.5, 1:3.6, 1:3.7, 1:3.8, 1:3.9, 1:4, etc., or any value within the above numerical range. Optionally or selectively, the flatness ratio of the flat glass fibers may be 1:3 or 1:4. For round glass fibers, the diameter of the round glass fibers may be 7-13 microns, for example, 7 microns, 8 microns, 9 microns, 10 microns, 11 microns, 12 microns, 13 microns, etc., or any value within the above numerical range. Optionally or selectively, the diameter of the round glass fibers may be 7 microns, 10 microns, 13 microns, etc.

[0036] In the glass fiber composition, the mass ratio of the flat glass fiber to the round glass fiber is 1:(0.05-0.3). Optionally or preferably, the mass ratio of the flat glass fiber to the round glass fiber is 1:(0.1-0.3). Optionally or preferably, the mass ratio of the flat glass fiber to the round glass fiber is 1:(0.15-0.25). Optionally or preferably, the mass ratio of the flat glass fiber to the round glass fiber is 1:(0.18-0.22). Alternatively, the mass ratio of the flat glass fiber to the round glass fiber can be any value within the above numerical range, for example, 1:0.176, 1:0.333, etc.

[0037] The composite flame retardant may be composed of a phosphorus-containing flame retardant and polysiloxane. The phosphorus-containing flame retardant may include one or more of phosphazene compounds and / or one or more of phosphate compounds. The phosphazene compound may be an inorganic or organic-inorganic hybrid containing a phosphazene group (-P=N-) in the molecule. In the present application, the general structural formula of the phosphazene compound may be (NPX 2 ) nWherein, N represents a nitrogen atom, P represents a phosphorus atom, X represents a substituent group, such as a halogen, an amino group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, etc., and n represents the number of repeating units, which can be an integer of 3 or greater. Some suitable non-limiting examples of phosphazene compounds can include hexa(dimethylamino)cyclotriphosphazene [NP(N(CH3) 2 ) 2 ] 3 、Hexaphenylcyclotriphosphazene (NPPh 2 ) 3 、Hexa(diethylamino)cyclotriphosphazene[NP(N(C2H5) 2 ) 2 ] 3 、hexa(morpholinyl)cyclotriphosphazene[NP(NC 4 H 8 O) 2 ] 3 、hexa(piperidinyl)cyclotriphosphazene[NP(NC 5 H 10 ) 2 ] 3 、Hexa(p-tolyl)cyclotriphosphazene [NP(p-CH 3 C 6 H 4 ) 2 ] 3 、Hexa(methoxy)cyclotriphosphazene [NP(OCH 3 ) 2 ] 3 、Hexa(ethoxy)cyclotriphosphazene[NP(OC 2 H 5 ) 2 ] 3 、hexa(isopropoxy)cyclotriphosphazene[NP(OCH(CH 3 ) 2 ) 2 ] 3 、Hexa(tert-butyloxy)cyclotriphosphazene[NP(OC(CH 3 ) 3 ) 2 ] 3 、Hexa(cyano)cyclotriphosphazene[NP(CN) 2 ] 3 、hexa(nitro)cyclotriphosphazene[NP(NO 2 ) 2 ] 3 、Hexa(amino)cyclotriphosphazene [NP(NH 2 ) 2 ] 3 、Hexa(acetylamino)cyclotriphosphazene [NP(NHCOCH 3 ) 2 ]3 、Hexa(phenoxy)cyclotriphosphazene[NP(OC 6 H 5 ) 2 ] 3 、Hexa(phenylthio)cyclotriphosphazene[NP(SC 6 H 5 ) 2 ] 3 In some embodiments, the phosphazene compound is hexa(phenoxy)cyclotriphosphazene.

[0038] The phosphate compounds can be represented by O=P(OR) 3 Represents. Wherein, O represents an oxygen atom, P represents a phosphorus atom, and R represents hydrogen or an organic group, including substituted or unsubstituted alkyl, aryl, etc. Examples of some suitable non-limiting phosphate compounds may include triphenyl phosphate, tritolyl phosphate, tri(2-ethylhexyl) phosphate, tri(2-butoxyethyl) phosphate, resin acid dimethyl ester phosphate, bisphenol A bis(diphenyl phosphate), resorcinol bis(diphenyl phosphate), tri(4-isopropylphenyl) phosphate, tri(2,4-di-tert-butylphenyl) phosphate, tri(4-isopropylphenyl) phosphate, tri(2,6-dimethylphenyl) phosphate, Tris(4-tert-butylphenyl)phosphate, tris(2-ethoxyethyl)phosphate, tris(2-methoxyethyl)phosphate, tris(2-propenyl)phosphate, tris(2-propynyl)phosphate, tris(4-bromophenyl)phosphate, tris(3,5-dimethylphenyl)phosphate, tris(2,4,6-trimethylphenyl)phosphate, tris(2-hydroxypropyl)phosphate, tris(2-propenyloxyethyl)phosphate, tris(2-cyanoethyl)phosphate, tris(2-carboxyethyl)phosphate, etc. In some embodiments, the phosphate compound is bisphenol A bis(phenyl phosphate) and / or resorcinol bis(diphenyl phosphate).

[0039] In some embodiments, the phosphazene compound and the phosphate compound can be used as flame retardants alone, or a mixture of the two compounds can be used as a flame retardant. When the phosphorus-containing flame retardant uses a mixture of the phosphazene compound and the phosphate compound, the mass ratio of the phosphazene compound to the phosphate compound is 1: (3-11). Optionally or preferably, the mass ratio of the phosphazene compound to the phosphate compound is 1: (4-10). Optionally or preferably, the mass ratio of the phosphazene compound to the phosphate compound is 1: (5-9). Optionally or preferably, the mass ratio of the phosphazene compound to the phosphate compound is 1: (6-8). Alternatively, the mass ratio of the phosphazene compound to the phosphate compound can be any value within the above numerical range, for example, the mass ratio of the phosphazene compound to the phosphate compound is 1: 5, 1: 6, 1: 7, etc.

[0040] In some embodiments, the phosphorus-containing flame retardant may also be other flame retardants, for example, phosphate compounds such as tributyl phosphate, disodium hexamethylenephthalate (POT), trisodium hexamethylenephthalate (TSP), phosphonate compounds, organic phosphorus salt compounds, phosphorus heterocyclic compounds and polymer phosphate (phosphonate) ester compounds, polyphosphate ammonium salt compounds, organic phosphinate metal salt compounds, etc.

[0041] The proportion of the phosphorus-containing flame retardant in the total mass of the flame retardant material (or referred to as the mass proportion) may be 2-20%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant may be 3-16%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant may be 4-12%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant may be 5-10%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant may be 6-8%. Alternatively, the mass proportion of the phosphorus-containing flame retardant may be any value within the numerical range as described above, for example, 6%, 7%, 8%, 9%, 10%, 12%, 15%, etc.

[0042] The polysiloxane used in the present application may be a polysiloxane having the general structural formula: 1 SiO 3 / 2 ] A [R 2 R 3 SiO] B [R 4 R 5 R 6 SiO 1 / 2 ] C Indicates. Among them, R 1 , R 2 , R 3 , R 4 , R5 , R 6 They may represent the same or different organic groups, including substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl, etc. When it is a substituted group, it may be substituted by heteroatoms (e.g., oxygen, nitrogen, sulfur, etc.), hydroxyl, alkoxy, etc., or a multifunctional group consisting of multiple groups above.

[0043] The alkyl group may have a variety of suitable structures, and some suitable alkyl groups may be non-branched and / or straight-chain functional groups, and some suitable alkyl groups may be branched and / or branched functional groups. Branched alkyl groups and / or branched alkyl groups may be branched and connected with a branched chain in a single position or at multiple positions. For example, two or more branches with equal lengths and / or two or more branches with unequal lengths may be included. For example, the alkyl group may include, but is not limited to, methyl, ethyl, n-propyl, isopropyl, butyl, isobutyl, tert-butyl, sec-butyl, n-pentyl, isopentyl, neopentyl, 2-methylbutyl, 3-methylbutyl, 2,2-dimethylpropyl, n-hexyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 2,3-dimethylbutyl, 2-ethylbutyl, 3-ethylpentyl, etc. The above alkyl group may also be substituted, such as non-halogen, particularly fluorine atom heteroatom substitution, etc.

[0044] Identical or similar, the alkenyl and alkynyl groups may also be unbranched and / or straight chain functional groups, or branched and / or hyperbranched. For alkenyl and alkynyl groups, branches may also be branched or connected at a single position or at multiple positions. When branched at multiple positions, the branches may be equally spaced or unequally spaced.

[0045] Exemplary alkenyl groups may include, but are not limited to, ethenyl, 1-propenyl, 2-butenyl, isobutenyl, 2-pentenyl, 2-methyl-1-propenyl, hexenyl, 2-methyl-2-pentenyl, 4-methyl-2-pentenyl, heptenyl, 2-heptenyl, etc. Exemplary alkynyl groups may include, but are not limited to, ethynyl, 1-propynyl, 2-butynyl, 3-pentynyl, 4-hexynyl, 3-methyl-1-butynyl, 4-methyl-1-pentynyl, 3,3-dimethyl-1-butynyl, 4-ethyl-1-hexynyl, 4-isopropyl-1-pentynyl, 3,4-dimethyl-1-pentynyl, etc.

[0046] The cycloalkyl group may be obtained by ring formation of the above-mentioned straight-chain alkyl groups. Some exemplary examples may be cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, methylcyclopropyl, ethylcyclobutyl, dimethylcyclohexyl, cyclohexenyl, cyclopentadienyl, cyclooctatetraenyl, bicyclo[2.2.1]heptyl, bicyclo[2.2.2]octyl, adamantyl (tricyclo[3.3.1.13,7]decyl), 1-methylcyclopentyl, 2-ethylcyclohexyl, 4-isopropylcyclohexyl, cycloheptenyl, etc.

[0047] Some suitable aryl groups can include phenyl, or functional groups constructed with phenyl as basic framework. A non-limiting example can be a condensed ring aryl obtained by condensing multiple phenyl groups, and another non-limiting example can be a substituted phenyl, and the substituted functional group can include unsubstituted and / or substituted alkyl, aryl, nitro, alkoxy, etc. For some exemplary examples, the aryl group can include but is not limited to phenyl, naphthyl, anthracenyl, phenanthrenyl, methylphenyl, p-tolyl, m-tolyl, o-tolyl, ethylphenyl, p-ethylphenyl, m-ethylphenyl, o-ethylphenyl, propylphenyl, isopropylphenyl, tert-butylphenyl, nitrophenyl, aminophenyl, dimethylaminophenyl, cyanophenyl, methoxyphenyl, ethoxyphenyl, formylphenyl, vinylphenyl, etc.

[0048] It should be noted that the above examples are only for illustrative purposes and are not intended to limit the scope of protection of this application. Any modification / adjustment / update made under the teachings of this application is within the scope of protection of this application.

[0049] The alkyl and aryl groups described herein may have various suitable lengths and spatial structures, and are described in terms of the number of carbon atoms contained, wherein the alkyl, alkenyl, alkynyl, cycloalkyl and aryl groups may each independently contain less than or equal to 30 carbon atoms, less than or equal to 28 carbon atoms, less than or equal to 26 carbon atoms, less than or equal to 24 carbon atoms, less than or equal to 22 carbon atoms, less than or equal to 20 carbon atoms, less than or equal to 18 carbon atoms, less than or equal to 16 carbon atoms, less than or equal to 14 carbon atoms, less than or equal to 12 carbon atoms, less than or equal to 10 carbon atoms, less than or equal to 8 carbon atoms, less than or equal to 6 carbon atoms, less than or equal to 4 carbon atoms, less than or equal to 3 carbon atoms, less than or equal to 2 carbon atoms, or 1 carbon atom. Of course, other ranges are also permitted.

[0050] The general structural formula of polysiloxane shown above includes three basic structural units constituting polysiloxane: T unit (R 1 SiO 3 / 2 , trifunctional unit), D unit (R 2 R 3 SiO, difunctional unit) and M unit (R4 R 5 R 6 SiO 1 / 2 , a monofunctional unit). A, B and C represent the number of repetitions of each unit. Based on the numerical selection of A, B and C, different types / kinds of polysiloxanes can be involved in the formation of the flame retardant material.

[0051] In some embodiments, the polysiloxane may be modified. For example, elements such as phosphorus, nitrogen, boron, aluminum, zirconium, and titanium are introduced to improve performance. For another example, the polysiloxane may include copolymers combined with other polymers, such as polydimethylsiloxane-polyphenylmethylsiloxane copolymers, polydimethylsiloxane-polyethylene copolymers, polydimethylsiloxane-polyacrylate copolymers, polydimethylsiloxane-polyurethane copolymers, polydimethylsiloxane-polystyrene copolymers, polydimethylsiloxane-polymethyl methacrylate copolymers, polydimethylsiloxane-polyethylene glycol copolymers, polydimethylsiloxane-polyvinyl pyrrolidone copolymers, polydimethylsiloxane-polyacrylonitrile copolymers, polydimethylsiloxane alkyl-polylactic acid copolymer, polydimethylsiloxane-polycaprolactone copolymer, polydimethylsiloxane-polycarbonate copolymer, polydimethylsiloxane-polyvinyl alcohol copolymer, polydimethylsiloxane-polyacrylamide copolymer, polydimethylsiloxane-polyhydroxyethyl methacrylate copolymer, polydimethylsiloxane-polyvinyl pyridine copolymer, polydimethylsiloxane-polyethylene oxide copolymer, polydimethylsiloxane-polybutadiene copolymer, polydimethylsiloxane-polyisobutylene copolymer, polydimethylsiloxane-polyacrylic acid copolymer, polydimethylsiloxane-polymethacrylic acid copolymer, etc. These copolymers combine the properties of polysiloxane with the properties of other polymers to achieve various unique properties to better meet the requirements.

[0052] In some implementations, the structural formula of the polysiloxane may be: [(R 1 ) 2 (R 2 )SiO 1 / 2 ] a ·[(R 3 ) 3 SiO 1 / 2 ] b ·[SiO 4 / 2 ] c , where R 1 , R 2 and R 3 It can be the same as the R described above. 1 To R 6The same or similar, each independently is an alkyl or substituted alkyl containing no more than 30 carbon atoms, an alkenyl or substituted alkenyl containing no more than 30 carbon atoms, an alkynyl or substituted alkynyl containing no more than 30 carbon atoms, and / or an aryl or substituted aryl containing no more than 30 carbon atoms. Wherein, a, b and c can satisfy the relationship (a+b):c=(0.4-1):1. For example, (a+b):c=0.4:1, or 0.5:1, or 0.6:1, or 0.7:1, or 0.8:1, or 0.9:1, or 1:1, etc. Alternatively, the relationship between a, b and c can be (a+b):c=0.68:1, 0.4:1, 1:1, etc. The polysiloxane associated with this relationship has a high silicon content and is easily transferred to the surface of the polycarbonate resin at the initial stage of combustion to form a dense and stable silicon-containing carbon layer, which can not only insulate heat and oxygen to block the further combustion reaction, but also prevent the internal decomposed combustibles from overflowing. The ratio of a, b, and c controls the network structure of the polysiloxane, achieving flame retardancy without reducing the mechanical properties of the glass fiber reinforced polycarbonate. In some embodiments, the polysiloxane may be methyl vinyl siloxane, and its structural formula may be: [(CH 3 ) 2 (CH 2 =CH)SiO 1 / 2 ] a ·[(CH 3 ) 3 SiO 1 / 2 ] b ·[SiO 4 / 2 ] c .

[0053] When participating in the formation of the flame retardant material, the mass proportion of the polysiloxane in the total mass of the flame retardant material is 0.4-20%, for example, 0.4%, 1%, 2%, 5%, 7%, 9%, 12%, 15%, 20%, etc. In some embodiments, the mass proportion of the polysiloxane in the total mass of the flame retardant material is 0.4%, 4%, 5%, 20%, etc.

[0054] In some embodiments, the polysiloxane may be replaced with other flame retardants to form the composite flame retardant with the phosphorus-containing flame retardant, for example, other high molecular polymers such as microporous expanded polypropylene (MPP) or inorganic compounds such as expanded graphite (EG).

[0055] In the present application, the content of the phosphorus-containing flame retardant in the flame retardant material can be equivalent to the content of polysiloxane (or other flame retardants), and the two play a synergistic role in flame retardancy, rather than one party assisting the flame retardant performance of the other party with a small mass ratio. The phosphorus-containing flame retardant can form a good flame retardant effect with polysiloxane, and the composite flame retardant formed by the mutual compounding can improve the anti-dripping performance of the flame retardant material, while achieving a thin-wall V-0 flame retardant grade of a fluorine-free formula. In some embodiments, the content of the polysiloxane can also be a smaller proportion than the content of the phosphorus-containing flame retardant. Polysiloxane is enhanced and synergistic with a small mass ratio of phosphorus-containing flame retardant.

[0056] The flame retardant material may further include an antioxidant, which can be used to improve the durability of the flame retardant material and maintain the long-term performance of the flame retardant material. Exemplary antioxidants may include, but are not limited to, 2,6-di-tert-butyl-4-methylphenol, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butylphenyl)phosphite, N,N'-bis(β-hydroxyethyl)-5-methylhydrazine-1,3-dicarboxamide, 2,2'-thiodiethanol bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenyl)benzene, 3,5-di-tert-butyl-4-hydroxybenzoic acid n-octyl ester, 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), distearylthiodipropionate, 2-(1, 1-dimethylethyl)-6-[3-(1,1-dimethylethyl)-2-hydroxy-5-methylphenyl]methyl-4-methylphenol, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, di(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, 2,2'-thiodiethanol bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 1,6-hexanediol bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 2,4-di-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)phenol, pentamethylenebis(β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 2,2'-methylenebis(6-tert-butyl-4-ethylphenol), etc. or any combination thereof.

[0057] By mass, the antioxidant may account for 0.1%-1%, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc. Alternatively, the antioxidant may account for any value within the above numerical range, for example, 0.3%.

[0058] The flame retardant may also include a lubricant. The lubricant may improve the processing properties, surface properties and mechanical properties of the material. Exemplary lubricants may include, but are not limited to, stearic acid, calcium stearate, zinc stearate, magnesium stearate, montmorillonite, talcum powder, polyethylene wax, ethylene glycol distearate, stearamide, ethylene bis stearamide, silicone oil, silicone powder, oxidized polyethylene wax, castor oil derivatives, lauramide, stearyl glyceride, pentaerythritol stearate, polypropylene wax, propylene glycol distearate, beeswax, paraffin, etc. or any combination thereof. Similarly, by mass, the mass proportion of the lubricant may be 0.1%-1%, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc. Alternatively, the mass proportion of the lubricant may be any value within the above numerical range, for example, 0.3%.

[0059] In some embodiments, other additives such as mold release agents, heat stabilizers, smoke suppressants, annual modifiers, etc. or additives to achieve other functions may be used to participate in the formation of the flame retardant material.

[0060] The present application also discloses a method for preparing the flame retardant material, which may include the following exemplary steps.

[0061] In the first step, according to the mass ratio of each component of the flame retardant material, each component is placed in a mixing device and mixed evenly to obtain a mixture.

[0062] In some embodiments, after weighing, the components of the flame retardant material can be placed in a mixing device for blending to obtain a mixture in which the components are uniformly mixed. The mixing device used can be various devices that can achieve mixing functions, such as horizontal mixers, vertical mixers, double cone mixers, V-type mixers, trough mixers, kneaders, planetary mixers, fluidized bed mixers, spiral cone mixers, belt mixers, tipping bucket mixers, air flow mixers, high-speed mixers, slurry mixers, vacuum mixers, etc. The mixing of the components can be dry mixing, melt mixing, solution mixing, etc. or any combination. In some embodiments, the mixing of the components of the flame retardant material can be achieved under molten conditions. Thermoplastic polymers, phosphorus-containing flame retardants, polysiloxanes, antioxidants, lubricants and other additives (if any) can first be added to a mixing device (e.g., a twin-screw extruder, a single-screw extruder, a kneader, a planetary mixer, etc.) for premixing. Subsequently, reinforcing materials are added to mix with the premix to obtain a uniform mixture. A suitable but non-limiting example may be to use a twin-screw extruder to mix the components. Reinforcing materials such as glass fiber composites are added to the mixing chamber by side feeding and mixed with the premix.

[0063] In the second step, the mixture is extruded into strips by using an extrusion device, and the strips are transferred to a granulation device for granulation, and the flame retardant material is obtained after post-processing.

[0064] In some embodiments, the mixture can be transferred to an extrusion device for strip extrusion. Alternatively, the aforementioned mixing device can simultaneously realize the extrusion function, so as to be further used as the extrusion device in the second step. For example, various types of extruders include single-screw extruders, twin-screw extruders, conical twin-screw extruders, multi-screw extruders, planetary screw extruders, etc. After the components used to make up the flame retardant material are mixed evenly in any of the above-mentioned suitable extruders, the strip extrusion operation is then performed. The strips can be transferred to a granulation device for granulation, such as directly using a hot pelletizer to cut the strips. Alternatively, the obtained strips can be cooled, for example, placed in a water tank and cooled by flowing cooling water (for example, 15°C-20°C). Then transfer it to a pelletizer (for example, a cold pelletizer, a rotary pelletizer, a swing pelletizer, etc.) for cutting the strips. The rotation speed of the pelletizer may be 500-700 rpm, for example, 500 rpm, 550 rpm, 600 rpm, 650 rpm, 700 rpm, etc., or may be adjusted according to actual process conditions or process requirements, which is not restrictive.

[0065] The precursor particles of the flame retardant material obtained after granulation can be treated to obtain the flame retardant material. The post-treatment may include cooling (e.g., to stabilize the particle shape and prevent adhesion), drying (e.g., to remove surface and internal moisture), screening (e.g., to separate particles of different sizes to ensure uniformity), dust removal (e.g., to remove fine dust and improve product purity), metal separation (e.g., to remove metal impurities that may be mixed in), surface treatment (e.g., to improve performance), coloring (e.g., to meet the needs of a specific color), metering packaging (e.g., to facilitate storage and transportation), etc. One or more of the above.

[0066] The flame retardant material disclosed in the present application can be used to prepare various products, such as electronic and electrical components, automotive parts, household items, aerospace components, power facilities, medical devices, energy storage protective parts, etc. Common thermoplastic processes such as injection molding, extrusion molding, blow molding, hot pressing molding, calendering, hot melt bonding, heat sealing, 3D printing and other processes can be used to prepare the flame retardant material into the aforementioned various products.

[0067] The present application is further described in detail below in conjunction with the examples. It should be noted that the following examples are only used to illustrate the present application and are not used to limit the scope of protection claimed in the present application.

[0068] Wherein, the sources of reagents used in the embodiments are as follows:

[0069]

[0070] Example 1 - Preparation of flame retardant material

[0071] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 1.

[0072] The preparation process is as follows:

[0073] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0074] Example 2 - Preparation of flame retardant materials

[0075] Compared with Example 1, Example 2 differs in that the ratio of the linear homopolycarbonate (MFR=2) to the branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0076] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 3:65.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 1.

[0077] The preparation process is as follows:

[0078] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0079] Example 3 - Preparation of flame retardant materials

[0080] Compared with Example 1, Example 3 differs in that the ratio of the linear homopolycarbonate (MFR=2) and the branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0081] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 10:58.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 1.

[0082] The preparation process is as follows:

[0083] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0084] Example 4 - Preparation of flame retardant material

[0085] Example 4 is compared with Example 1, except that the ratio of the linear homopolycarbonate (MFR=2) and the branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0086] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 23:45.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 1.

[0087] The preparation process is as follows:

[0088] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0089] Example 5 - Preparation of flame retardant material

[0090] Compared with Example 1, Example 5 differs in that the melt indexes of the linear homopolycarbonate and the branched polycarbonate in the polycarbonate composition are different.

[0091] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=36) and branched polycarbonate (MFR=3) (mass ratio is 5:65.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 1.

[0092] The preparation process is as follows:

[0093] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0094] Example 6 - Preparation of flame retardant material

[0095] Compared with Example 1, Example 6 is different in that the melt indexes of the linear homopolycarbonate and the branched polycarbonate in the polycarbonate composition are different.

[0096] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=12) (mass ratio is 5:65.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 1.

[0097] The preparation process is as follows:

[0098] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0099] Example 7 - Preparation of flame retardant material

[0100] Compared with Example 1, Example 7 differs in that the ratio of flat glass fibers to round glass fibers in the glass fiber composition is different.

[0101] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 15:5; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 2.

[0102] The preparation process is as follows:

[0103] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0104] Example 8 - Preparation of flame retardant material

[0105] Compared with Example 1, Example 8 differs in that the ratio of flat glass fibers to round glass fibers in the glass fiber composition is different.

[0106] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 19:1; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 2.

[0107] The preparation process is as follows:

[0108] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0109] Example 9 - Preparation of flame retardant material

[0110] The difference between Example 9 and Example 1 is that the flatness ratio of the flat glass fibers in the glass fiber composition is different.

[0111] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:3, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 2.

[0112] The preparation process is as follows:

[0113] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0114] Example 10 - Preparation of flame retardant material

[0115] Compared with Example 1, Example 10 differs in that the diameter of the round glass fiber in the glass fiber composition is different.

[0116] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:3, the diameter of the round glass fiber is 7 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 2.

[0117] The preparation process is as follows:

[0118] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0119] Example 11 - Preparation of flame retardant material

[0120] Compared with Example 1, Example 11 is different in that the diameter of the round glass fiber in the glass fiber composition is different.

[0121] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:3, the diameter of the round glass fiber is 13 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 2.

[0122] The preparation process is as follows:

[0123] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0124] Example 12 - Preparation of flame retardant material

[0125] Example 12 is compared with Example 1, except that the phosphorus-containing flame retardant is a mixture of phosphazene and bisphenol A bis(phenyl phosphate) with different mass ratios. Also, the ratios of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) in the polycarbonate composition are different.

[0126] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:61.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and bisphenol A bis (phenyl phosphate), the mass ratio is 1:7, the polysiloxane (a+b):c=0.68:1, the above components are taken according to the mass ratio of 66.4:20:8:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 3.

[0127] The preparation process is as follows:

[0128] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0129] Example 13 - Preparation of flame retardant material

[0130] Example 14 is compared with Example 1, except that the mass ratio of phosphazene to resorcinol bis(diphenyl phosphate) in the phosphorus-containing flame retardant is different, and the ratio of linear homopolycarbonate (MFR=2) to branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0131] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:62.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 2:5, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 67.4:20:7:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 3.

[0132] The preparation process is as follows:

[0133] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0134] Example 14 - Preparation of flame retardant material

[0135] Example 14 is compared with Example 1, except that the mass ratio of phosphazene to resorcinol bis(diphenyl phosphate) in the phosphorus-containing flame retardant is different, and the ratio of linear homopolycarbonate (MFR=2) to branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0136] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:64.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 1:3, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 69.4:20:4:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 3.

[0137] The preparation process is as follows:

[0138] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0139] Example 15 - Preparation of flame retardant material

[0140] Example 15 is compared with Example 1, except that the mass ratio of phosphazene to resorcinol bis(diphenyl phosphate) in the phosphorus-containing flame retardant is different, and the ratio of linear homopolycarbonate (MFR=2) to branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0141] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:61.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate) with a mass ratio of 2:6, and the polysiloxane has (a+b):c=0.68:1. The above components are taken according to the mass ratio of 66.4:20:8:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 3.

[0142] The preparation process is as follows:

[0143] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0144] Example 16 - Preparation of flame retardant material

[0145] Example 16 is compared with Example 1, except that the mass ratio of phosphazene to resorcinol bis(diphenyl phosphate) in the phosphorus-containing flame retardant is different, and the ratio of linear homopolycarbonate (MFR=2) to branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0146] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:57.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:11, the polysiloxane (a+b):c=0.68:1, the above components are taken according to the mass ratio of 62.4:20:12:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 3.

[0147] The preparation process is as follows:

[0148] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0149] Example 17 - Preparation of flame retardant material

[0150] Compared with Example 1, Example 17 differs in that the mass ratio of phosphazene to resorcinol bis(diphenyl phosphate) in the phosphorus-containing flame retardant is different, and the mass proportion of polysiloxane is different.

[0151] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:6, the polysiloxane (a+b):c=0.68:1, the mass ratio is 4%, the above components are taken according to the mass ratio of 68.4:20:7:4, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 4.

[0152] The preparation process is as follows:

[0153] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0154] Example 18 - Preparation of flame retardant material

[0155] Compared with Example 1, Example 18 differs in that the mass proportion of polysiloxane is different, the ratio of linear homopolycarbonate (MFR=2) to branched polycarbonate (MFR=3) in the polycarbonate composition is different, and the ratio of phosphazene compounds to phosphate compounds in the phosphorus-containing composition is different.

[0156] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:66.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:10, the polysiloxane (a+b):c=0.68:1, the mass ratio is 0.4%, the above components are taken according to the mass ratio of 71.4:20:11:0.4, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 4.

[0157] The preparation process is as follows:

[0158] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0159] Example 19 - Preparation of flame retardant material

[0160] Compared with Example 1, Example 19 differs in that the mass proportion of polysiloxane is different, and the proportion of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0161] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:66.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:5, the polysiloxane (a+b):c=0.68:1, the mass ratio is 2%, the above components are taken according to the mass ratio of 71.4:20:6:2, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 4.

[0162] The preparation process is as follows:

[0163] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0164] Example 20 - Preparation of flame retardant material

[0165] Compared with Example 1, Example 20 differs in that the mass proportion of polysiloxane is different, and the proportion of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) in the polycarbonate composition is different.

[0166] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:48.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:5, the polysiloxane (a+b):c=0.68:1, the mass ratio is 20%, the above components are taken according to the mass ratio of 53.4:20:6:20, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 4.

[0167] The preparation process is as follows:

[0168] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0169] Example 21 - Preparation of flame retardant material

[0170] Compared with Example 1, Example 21 differs in that the polysiloxane structure is different.

[0171] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:5, the polysiloxane (a+b):c=0.4:1, the mass ratio is 5%, the above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 4.

[0172] The preparation process is as follows:

[0173] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0174] Example 22 - Preparation of flame retardant material

[0175] Compared with Example 1, Example 22 differs in that the polysiloxane structure is different.

[0176] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:5, the polysiloxane (a+b):c=1:1, the mass ratio is 5%, the above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 4.

[0177] The preparation process is as follows:

[0178] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0179] Example 23 - Preparation of flame retardant material

[0180] Compared with Example 1, Example 23 differs in that the reinforcing material is carbon fiber instead of a glass fiber composite.

[0181] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is carbon fiber, with a mass ratio of 20%; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), with a mass ratio of 1:5, and the polysiloxane (a+b):c=1:1, with a mass ratio of 5%. The above components are taken according to a mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, with a mass ratio of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 5.

[0182] The preparation process is as follows:

[0183] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and carbon fiber is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0184] Example 24 - Preparation of flame retardant material

[0185] Compared with Example 1, Example 24 differs in that the phosphorus-containing flame retardant is diethyl aluminum hypophosphite, which forms a composite flame retardant with MPP instead of silicone resin.

[0186] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:61.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is diethyl aluminum hypophosphite, accounting for 10% by mass, and MPP accounts for 3% by mass. The above components are taken according to the mass ratio of 66.4:20:10:3, and the rest are antioxidants and lubricants, accounting for 0.3% and 0.3% by mass respectively. The specific mass ratios are shown in Table 6.

[0187] The preparation process is as follows:

[0188] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, MPP and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0189] Example 25 - Preparation of flame retardant material

[0190] Compared with Example 1, Example 25 differs in that the phosphorus-containing flame retardant and MPP instead of polysiloxane form a composite flame retardant.

[0191] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:62.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:8, and the mass proportion of MPP is 3%. The above components are taken according to the mass ratio of 67.4:20:9:3, and the rest are antioxidants and lubricants, with mass proportions of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 6.

[0192] The preparation process is as follows:

[0193] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, MPP and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0194] Example 26 - Preparation of flame retardant material

[0195] Compared with Example 1, Example 26 differs in that the phosphorus-containing flame retardant is diethyl aluminum hypophosphite.

[0196] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:59.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is diethyl aluminum hypophosphite, accounting for 10% by mass, and the polysiloxane (a+b):c=0.68:1, accounting for 5% by mass. The above components are taken according to the mass ratio of 64.4:20:10:5, and the rest are antioxidants and lubricants, accounting for 0.3% and 0.3% by mass respectively. The specific mass ratios are shown in Table 6.

[0197] The preparation process is as follows:

[0198] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0199] Example 27 - Preparation of flame retardant material

[0200] Compared with Example 1, Example 27 differs in that flat glass fiber is used alone, and the phosphorus-containing flame retardant and MPP instead of silicone resin constitute a composite flame retardant.

[0201] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:62.4); the reinforcing material is flat glass fiber, the flatness ratio is 1:4, and the mass ratio is 20%; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:8, and the mass ratio of MPP is 3%. The above components are taken according to the mass ratio of 67.4:20:9:3, and the rest are antioxidants and lubricants, with mass ratios of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 6.

[0202] The preparation process is as follows:

[0203] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, MPP and other additives are added to a twin-screw extruder for mixing, and flat glass fiber is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0204] Example 28 - Preparation of flame retardant material

[0205] Compared with Example 1, Example 28 differs in that the phosphorus-containing flame retardant and MPP instead of polysiloxane form a composite flame retardant.

[0206] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:62.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:8, and the mass proportion of MPP is 3%. The above components are taken according to the mass ratio of 67.4:20:9:3, and the rest are antioxidants and lubricants, with mass proportions of 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 6.

[0207] The preparation process is as follows:

[0208] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, MPP and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0209] Example 29 - Preparation of flame retardant material

[0210] Compared with Example 1, Example 29 differs in that only flat glass fiber is used.

[0211] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:63.4); the reinforcing material is flat glass fiber, the flatness ratio is 1:4, and the mass ratio is 20%; the phosphorus-containing flame retardant in the composite flame retardant is a mixture of phosphazene and resorcinol bis(diphenyl phosphate), the mass ratio is 1:5, the polysiloxane (a+b):c=0.68:1, the mass ratio is 5%, the above components are taken according to the mass ratio of 68.4:20:6:5, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 6.

[0212] The preparation process is as follows:

[0213] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and flat glass fiber is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0214] Example 30 - Preparation of flame retardant material

[0215] Compared with Example 1, Example 30 differs in that flat glass fiber is used alone, and the phosphorus-containing flame retardant is diethyl aluminum hypophosphite.

[0216] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:61.4); the reinforcing material is flat glass fiber, the flatness ratio is 1:4, and the mass ratio is 20%; the phosphorus-containing flame retardant in the composite flame retardant is diethyl aluminum hypophosphite, the mass ratio is 8%, the polysiloxane (a+b):c=0.68:1, the mass ratio is 5%, the above components are taken according to the mass ratio of 66.4:20:8:5, and the rest are antioxidants and lubricants, the mass ratios are 0.3% and 0.3% respectively. The specific mass ratios are shown in Table 6.

[0217] The preparation process is as follows:

[0218] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and flat glass fiber is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0219] Example 31 - Preparation of flame retardant material

[0220] Compared with Example 1, Example 31 differs in that flat glass fiber is used alone, and the phosphorus-containing flame retardant is diethyl aluminum hypophosphite.

[0221] In this embodiment, the thermoplastic polymer is a polycarbonate composition of linear homopolycarbonate (MFR=2) and branched polycarbonate (MFR=3) (mass ratio is 5:61.4); the reinforcing material is a glass fiber composition, the flatness ratio of the flat glass fiber in the glass fiber composition is 1:4, the diameter of the round glass fiber is 10 microns, and the mass ratio of the flat glass fiber to the round glass fiber is 17:3; the phosphorus-containing flame retardant in the composite flame retardant is diethyl aluminum hypophosphite, accounting for 8% by mass, and the polysiloxane (a+b):c=0.68:1, accounting for 5% by mass. The above components are taken according to the mass ratio of 66.4:20:8:5, and the rest are antioxidants and lubricants, accounting for 0.3% and 0.3% by mass respectively. The specific mass ratios are shown in Table 6.

[0222] The preparation process is as follows:

[0223] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0224] Comparative Example 1-Preparation of flame retardant material

[0225] Comparative Example 1 is compared with Example 1, except that the thermoplastic polymer is a linear homopolycarbonate (MFR=2).

[0226] In Comparative Example 1, linear homopolycarbonate (MFR=2) (mass ratio of 68.4%) is used; the linear homopolycarbonate, glass fiber composition, phosphorus-containing flame retardant, polysiloxane, antioxidant and lubricant are prepared in a mass ratio of 68.4:20:6:5:0.3:0.3. The specific mass ratios are shown in Table 1.

[0227] The preparation process is as follows:

[0228] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0229] Comparative Example 2-Preparation of flame retardant material

[0230] The difference between Comparative Example 2 and Example 1 is that the mass ratio of the linear homopolycarbonate to the branched polycarbonate in the polycarbonate composition is different.

[0231] In Comparative Example 2, the mass ratio of linear homopolycarbonate (MFR=2) to branched polycarbonate (MFR=3) is 25:43.4. The polycarbonate composition, glass fiber composition, phosphorus-containing flame retardant, polysiloxane, antioxidant and lubricant are prepared in a mass ratio of 68.4:20:6:5:0.3:0.3. The specific mass ratios are shown in Table 1.

[0232] The preparation process is as follows:

[0233] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0234] Comparative Example 3-Preparation of flame retardant material

[0235] The difference between Comparative Example 3 and Example 1 is that only flat glass fibers are used.

[0236] In Comparative Example 3, the polycarbonate composition, the flat glass fiber, the phosphorus-containing flame retardant, the polysiloxane, the antioxidant and the lubricant are prepared in a mass ratio of 68.4:20:6:5:0.3:0.3. The specific mass ratios are shown in Table 2.

[0237] The preparation process is as follows:

[0238] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0239] Comparative Example 4-Preparation of flame retardant material

[0240] Compared with Example 1, Comparative Example 4 differs in that only round glass fibers are used.

[0241] In Comparative Example 4, the polycarbonate composition, round glass fiber, phosphorus-containing flame retardant, polysiloxane, antioxidant and lubricant are prepared in a mass ratio of 68.4:20:6:5:0.3:0.3. The specific mass ratios are shown in Table 2.

[0242] The preparation process is as follows:

[0243] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0244] Comparative Example 5-Preparation of flame retardant material

[0245] The difference between Comparative Example 5 and Example 1 is that the mass ratio of the flat glass fiber to the round glass fiber in the glass fiber composition is different, which is 1:1.

[0246] In Comparative Example 5, the polycarbonate composition, the glass fiber composition, the phosphorus-containing flame retardant, the polysiloxane, the antioxidant and the lubricant are prepared in a mass ratio of 68.4:20:6:5:0.3:0.3. See Table 2 for the specific mass ratios.

[0247] The preparation process is as follows:

[0248] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0249] Comparative Example 6-Preparation of flame retardant material

[0250] The difference between Comparative Example 6 and Example 1 is that the phosphorus-containing flame retardant is resorcinol bis(diphenyl phosphate).

[0251] In Comparative Example 6, the polycarbonate composition, the glass fiber composition, the phosphorus-containing flame retardant (resorcinol bis(diphenyl phosphate)), the polysiloxane, the antioxidant and the lubricant were prepared in a mass ratio of 68.4:20:6:5:0.3:0.3. The specific mass ratios are shown in Table 2.

[0252] The preparation process is as follows:

[0253] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, polysiloxane and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0254] Comparative Example 7-Preparation of flame retardant material

[0255] The difference between Comparative Example 7 and Example 1 is that the phosphorus-containing flame retardant is used alone instead of polysiloxane, and the mass ratio of phosphazene to resorcinol bis(diphenyl phosphate) in the phosphorus-containing flame retardant is different.

[0256] In Comparative Example 7, the polycarbonate composition, the glass fiber composition, the phosphorus-containing flame retardant, the antioxidant and the lubricant are prepared in a mass ratio of 68.4:20:9:0.3:0.3. The specific mass ratios are shown in Table 4.

[0257] The preparation process is as follows:

[0258] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant and other additives are added to a twin-screw extruder for mixing, and the glass fiber composition is added by side feeding during the mixing process. After mixing evenly, the material strips are extruded and cooled in a water tank. The cooling water temperature is 15-20°C. After cooling, the material strips are added to a pelletizer for pelletizing, and the speed of the pelletizer is 500-700rpm. After the pellets are dried by an elevator, they are packaged in portions to obtain the final product.

[0259] Flame retardant grade test

[0260] The flame retardant grade of the products prepared from the flame retardant materials obtained in Examples 1-31 and Comparative Examples 1-7 was tested: the flame retardant test strips were treated with two conditions, condition 1: 23°C 50%RH treatment for 48h, condition 2: 70°C oven treatment for 168h. The two treatment conditions were tested for vertical burning flame retardancy according to the UL94 standard, and the lower grade was taken as the final flame retardancy grade result. The test results are summarized in Tables 1 to 6.

[0261] Tensile strength and elongation at break test

[0262] The products made of the flame retardant materials obtained in Examples 1-31 and Comparative Examples 1-7 were tested for tensile strength and elongation at break: the tensile test was conducted according to ISO 527 standard, the tensile speed was 5 mm / min, and the average value of 5 pieces was taken. The test results are summarized in Tables 1 to 6.

[0263] Charpy notched impact test

[0264] The products made of the flame retardant materials obtained in Examples 1-31 and Comparative Examples 1-7 were subjected to a simple beam notched impact test: the impact test bars were notched according to ISO 179 and then tested. The test temperature was 23° C. Ten bars were tested and the average value was taken. The test results are summarized in Tables 1 to 6.

[0265] Table 1 Composition and test results of flame retardant materials

[0266]

[0267] Table 2 Composition and test results of flame retardant materials

[0268]

[0269] Table 3 Composition and test results of flame retardant materials

[0270]

[0271] Table 4 Composition and test results of flame retardant materials

[0272]

[0273] Table 5 Composition and test results of flame retardant materials

[0274]

[0275] Table 6 Composition and test results of flame retardant materials

[0276]

[0277] It can be seen from Tables 1 to 6 above that the flame retardant material provided in the embodiments of the present application can achieve a higher flame retardant grade (0.6mm flame retardant grade V-0) than the comparative example, and the tensile strength and elongation at break are not degraded due to the change of components. At the same time, the simply supported beam notched impact results show that the toughness of the material is not reduced.

[0278] The basic concepts have been described herein. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0279] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", "some embodiments", and / or "some implementation methods" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in the present application does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0280] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment or its description. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0281] Finally, it should be understood that the embodiments described in this application are only used to illustrate the principles of the embodiments of the present application. Other variations may also fall within the scope of the present application. Therefore, as an example and not a limitation, the alternative configurations of the embodiments of the present application may be considered to be consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described in the present application.

Claims

1. A flame retardant material, characterized in that: The flame retardant material comprises: Thermoplastic polymer; the thermoplastic polymer comprises a mixture of linear homopolycarbonate and branched polycarbonate; the mass ratio of the linear homopolycarbonate to the branched polycarbonate is (0.05-0.5):1; the melt index of the linear homopolycarbonate is 2-36 g / 10 min, and the melt index of the branched polycarbonate is 3-12 g / 10 min; Reinforcement material; the reinforcement material comprises a glass fiber composition or carbon fiber; the glass fiber composition comprises flat glass fiber and round glass fiber, the mass ratio of the flat glass fiber to the round glass fiber is 1:(0.05-0.3); the flatness ratio of the flat glass fiber is 1:3-1:4, and the diameter of the round glass fiber is 7-13 microns; and A composite flame retardant, comprising a phosphorus-containing flame retardant and polysiloxane; the phosphorus-containing flame retardant is selected from one or more phosphazene compounds and one or more phosphate compounds; the mass ratio of the phosphazene compound to the phosphate compound is 1:(3-11); Wherein, the mass ratio of the thermoplastic polymer, the reinforcing material, the phosphorus-containing flame retardant, and the polysiloxane is (30-80): (10-50): (4-12): (0.4-20); The structural formula of the polysiloxane is: [(R1)2(R2)SiO 1 / 2 ] a ·[(R3)3SiO 1 / 2 ] b ·[SiO 4 / 2 ] c , R1, R2 and R3 are the same or different and are each independently an alkyl or substituted alkyl group containing no more than 30 carbon atoms, an alkenyl or substituted alkenyl group containing no more than 30 carbon atoms, an alkynyl or substituted alkynyl group containing no more than 30 carbon atoms, and / or an aryl or substituted aryl group containing no more than 30 carbon atoms; (a+b):c=(0.4-1):1; The flame retardant material does not contain fluorine element.

2. The flame retardant material according to claim 1, characterized in that: The thermoplastic polymer comprises at least 30% recycled content.

3. The flame retardant material according to claim 1, characterized in that: The carbon fiber contains at least 30% recycled material.

4. The flame retardant material according to claim 1, characterized in that: The phosphazene compound is hexaphenoxy cyclotriphosphazene, and the phosphate compound is bisphenol A bis(phenyl phosphate) and / or resorcinol bis(diphenyl phosphate).

5. The flame retardant material according to claim 1, characterized in that: The structural formula of the polysiloxane is: [(CH3)2(CH2=CH)SiO 1 / 2 ] a ·[(CH3)3SiO 1 / 2 ] b ·[SiO 4 / 2 ] c .

6. The flame retardant material according to claim 1, characterized in that: The flame retardant material further includes an antioxidant, and the antioxidant includes one or more of antioxidant 168, antioxidant 1010, and antioxidant 1098.

7. The flame retardant material according to claim 1, characterized in that: The flame retardant material further includes a lubricant, and the lubricant includes one or more of calcium stearate, stearic acid, ethylene bis stearamide, pentaerythritol stearate, silicone powder, and polyethylene wax.

8. A method for preparing a flame retardant material according to any one of claims 1 to 7, characterized in that: The preparation method comprises: According to the mass ratio of each component of the flame retardant material, each component is placed in a mixing device and mixed evenly to obtain a mixture; The mixture is extruded into material strips by using an extrusion device, and is transferred to a granulation device for granulation, and the flame retardant material is obtained after post-processing.

9. A product, wherein the product is made of the flame retardant material according to any one of claims 1 to 8.

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