Flame-retardant material, preparation method thereof and product

Abstract

The invention discloses a flame-retardant material, a preparation method thereof and a product. The flame-retardant material comprises a triazine compound which is used as a charring agent of the flame-retardant material. The mass ratio of the triazine compound in the flame-retardant material is 0.2 to 10 percent. The triazine compound can cooperate with the flame retardant contained in the flame-retardant material to form a compact carbon layer on the surface of the material in the combustion process, so that the dripping phenomenon during combustion is inhibited, the combustion time is shortened, and the thin-wall flame-retardant grade V-0 is realized.

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 V-0, a method for preparing 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 is increasingly in need of lighter and thinner designs that can achieve their desired flame retardant grades and generally requires products to be halogen-free. PTFE is generally used as an anti-drip agent in the prior art to achieve the V-0 grade. Perfluoro and polyfluoroalkyl substances (PFAS) are considered permanent chemicals that can persist in the environment and are almost not biodegradable. They are not only easy to cause harm to the environment, but also easy to 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 on 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, as well as a product obtained based on the flame retardant material. The flame retardant material can form a dense carbon layer on the surface during combustion, inhibit dripping during combustion, and achieve a flame retardant grade of V-0 in a thin-wall condition of 1mm.

[0004] In a first aspect, the present application discloses a flame retardant material, which may include: a triazine compound used as a charring agent for the flame retardant material; the mass proportion of the triazine compound in the flame retardant material may be 0.2-10%.

[0005] According to some embodiments of the present application, the triazine compound may include one or more of 1,3,5-triazine, 2,4,6-tris(N-hydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N-hydroxymethyl-N-hydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N,N-dihydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N,N-dimethoxyamino)-1,3,5-triazine, poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazinediyl], etc.

[0006] According to some embodiments of the present application, the triazine compound may be poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazinediyl].

[0007] According to some embodiments of the present application, the flame retardant material may further include: polycarbonate; a reinforcing material; and a phosphorus-containing flame retardant; wherein the mass proportions of the thermoplastic polymer, the reinforcing material, the phosphorus-containing flame retardant, and the triazine compound in the flame retardant material may be (30-80): (10-50): (2-20): (0.2-10).

[0008] According to some embodiments of the present application, the thermoplastic polymer may contain at least 30% recycled materials. By using recycled materials, petrochemical resources can be saved and the environment is friendly.

[0009] According to some embodiments of the present application, the thermoplastic polymer may include a mixture of linear homopolymer and branched polycarbonate; the mass ratio of the linear homopolymer to the branched polycarbonate is (0.05-0.5): 1; the melt index of the linear homopolymer is 1-40 g / 10 min, and the melt index of the branched polycarbonate is 2-15 g / 10 min. The traditional anti-drip agent PTFE has a large molecular weight, and it is fibrosed to form a mesh structure under the shear force of the screw, thereby playing an anti-drip role. By compounding branched and linear polycarbonates, a small amount of linear molecular chains are mixed into 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 mesh structure locally, thereby improving the melt strength and improving the dripping phenomenon during combustion, and the traditional anti-drip agent PTFE is not environmentally friendly.

[0010] According to some embodiments of the present application, the thermoplastic polymer may contain at least 30% recycled material.

[0011] 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.

[0012] According to some embodiments of the present application, the glass fiber composition may contain flat glass fibers and / or round glass fibers, and the mass ratio of the flat glass fibers to the round glass fibers is 1:(0.05-0.3); the flatness ratio of the flat glass fibers is 1:3-1:4, and the diameter of the round glass fibers 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 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 fibers are 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.

[0013] According to some embodiments of the present application, the phosphorus-containing flame retardant may include one or more of phosphate compounds; the phosphate compounds may be selected from one or more of bisphenol A bis(phenyl phosphate), resorcinol bis(diphenyl phosphate), and resorcinol bis[di(2,6-dimethylphenyl)phosphate].

[0014] 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 .

[0015] 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.

[0016] 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.

[0017] A third aspect of the present application provides a product, which can be made of the flame retardant material as described above.

[0018] 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

[0019] 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.

[0020] 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.

[0021] The flame retardant material disclosed in the present application, by using a combination of thermoplastic polymer with excellent anti-dripping performance, glass fiber, flame retardant and triazine carbon-forming agent, achieves the suppression of dripping phenomenon during combustion under thin-wall conditions, and reaches a 1mm flame retardant grade of 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.

[0022] 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.

[0023] The present application discloses a flame retardant material, which may include a triazine compound. The triazine compound may be used as a carbon-forming agent for the flame retardant material. Triazine compounds undergo a series of complex pyrolysis reactions under high temperature conditions, and form a carbon skeleton after the volatile components are lost, the nitrides are converted and combined with each other. Due to the stable structure of the triazine ring, the carbon skeleton formed is stable, the carbon layer formed is dense, and has excellent heat insulation and oxygen isolation capabilities. It can prevent dripping while being flame retardant. Therefore, the high flame retardant grade of the flame retardant material can be achieved while suppressing the dripping phenomenon.

[0024] Examples of suitable but non-limiting triazine compounds may include 1,3,5-triazine, 2,4,6-tris(N-hydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N-hydroxymethyl-N-hydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N,N-dihydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N,N-dimethoxyamino)-1,3,5-triazine, poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazinediyl], melamine (2,4,6-triamine-1,3,5-triazine) and its derivatives, and the like. Exemplary melamine derivatives may include, but are not limited to, cyanuric acid, melamine phosphate, melamine polyphosphate, melamine borate, melamine cyanurate, melamine formaldehyde resin, melamine sulfonate, melamine pyrophosphate, melamine zinc phosphate, melamine aluminum phosphate, melamine magnesium phosphate, melamine cyanurate-formaldehyde resin, melamine-urea-formaldehyde resin, melamine-phenolic resin, melamine-epoxy resin, melamine-ammonium polyphosphate complex, melamine-phosphorus pentoxide complex, etc. or any combination thereof. In some embodiments, the triazine compound may be poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazinediyl].

[0025] In some embodiments, the mass proportion of the triazine compound in the total mass of the flame retardant material is 0.2-10%, and optionally or preferably, the mass proportion of the triazine compound in the total mass of the flame retardant material is 1-9%. Optionally or preferably, the mass proportion of the triazine compound in the total mass of the flame retardant material is 2-8%. Optionally or preferably, the mass proportion of the triazine compound in the total mass of the flame retardant material is 3-7%. Optionally or preferably, the mass proportion of the triazine compound in the total mass of the flame retardant material is 4-6%. Optionally or preferably, the mass proportion of the triazine compound in the total mass of the flame retardant material is 4.5-5.5%. Alternatively, the mass proportion of the triazine compound in the total mass of the flame retardant material is any value within the above numerical range, for example, 0.2%, 0.5%, 1%, 2%, 5%, 8%, 10%, etc. In some embodiments, the mass proportion of the triazine compound in the total mass of the flame retardant material is 3%.

[0026] The flame retardant material may further include a thermoplastic polymer reinforced by a reinforcing material, a phosphorus-containing flame retardant, and other auxiliary agents.

[0027] The thermoplastic polymer may include a combination of one or more polymers, 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.

[0028] 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.

[0029] 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, an end-capping agent can also be used to control and improve the molecular weight and performance of the polymer. Such as monophenol compounds (such as phenol, p-tert-butylphenol, p-isooctylphenol, p-dodecylphenol, p-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 p-tert-butylbenzoic acid, methyl p-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. Wherein, G represents a leaving group, which can usually be a hydroxyl group (-OH) or other reactive groups, and L can be C1-C 12 Aliphatic or aromatic linking groups such as alkyl or aryl, R can be C1-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.

[0030] 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 to participate in the polymerization reaction so that the branching points of the branched polycarbonate are more evenly distributed. Alternatively, high energy radiation is used to induce crosslinking and branching of polycarbonate molecular chains to synthesize branched polycarbonate. For example, linear polycarbonate is irradiated with gamma rays or electron beams under controlled conditions to form a branched structure through free radical reaction. 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.

[0031] 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.

[0032] 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, 1:0.05:1, 0.08:1:0.17, 1:0.5, etc.

[0033] 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. In the present application, the selection of the melt index of the linear polycarbonate and the branched polycarbonate has an impact on the performance of the flame retardant material. The above-mentioned limitation on the melt index can enable the flame retardant material to have better performance, rather than being selected at will.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 good for the environment.

[0038] 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 composed 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 enhance 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.

[0039] 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.

[0040] In some embodiments, the reinforcing material can be a glass fiber composite. The term "glass fiber" can be regarded as an abbreviation of "glass fiber" in this application. In some embodiments, the glass fiber composite can include flat glass fiber and / or round glass fiber. Flat glass fiber can be an elliptical cross section or a quasi-elliptical cross section, and round glass fiber can be a solid circular cross section or a ring cross section. 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 can be obtained by adjusting the raw material selection and ratio, such as E-glass fiber, S-glass fiber, C-glass fiber, etc. The glass fiber 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.

[0041] 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.

[0042] In some embodiments, the glass fiber composition may consist of only flat glass fibers, or only round glass fibers.

[0043] The phosphorus-containing flame retardant may include one or more of the phosphazene compounds and / or one or more of the phosphate compounds. The phosphazene compounds may be inorganic or organic-inorganic hybrids containing a phosphazene group (-P=N-) in the molecule. In the present application, the general structural formula of the phosphazene compounds may be (NPX2) n Represents. Wherein, 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 may include hexa(dimethylamino)cyclotriphosphazene [NP(N(CH3)2)2]3, hexaphenylcyclotriphosphazene (NPPh2)3, hexa(diethylamino)cyclotriphosphazene [NP(N(C2H5)2)2]3, hexa(morpholinyl)cyclotriphosphazene [NP(NC4H8O)2]3, hexa(piperidinyl)cyclotriphosphazene [NP(NC5H 10 )2]3, hexa(p-tolyl)cyclotriphosphazene [NP(p-CH3C6H4)2]3, hexa(methoxy)cyclotriphosphazene [NP(OCH3)2]3, hexa(ethoxy)cyclotriphosphazene [NP(OC2H5)2]3, hexa(isopropoxy)cyclotriphosphazene [NP(OCH(CH3)2)2]3, hexa(tert-butoxy)cyclotriphosphazene [NP(OC(CH3)3)2]3, hexa(cyano)cyclotriphosphazene [NP(CN)2]3, hexa(nitro)cyclotriphosphazene [NP(NO2)2]3, hexa(amino)cyclotriphosphazene [NP(NH2)2]3, hexa(acetylamino)cyclotriphosphazene [NP(NHCOCH3)2]3, hexa(phenoxy)cyclotriphosphazene [NP(OC6H5)2]3, hexa(phenylthio)cyclotriphosphazene [NP(SC6H5)2]3, etc. In some embodiments, the phosphazene compound is hexa(phenoxy)cyclotriphosphazene.

[0044] The phosphate compound can be represented by O=P(OR)3. 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. Some suitable non-limiting examples of 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), resorcinol bis[di(2,6-dimethylphenyl) phosphate], tri(4-isopropylphenyl) phosphate, tri(2,4-di-tert-butylphenyl) phosphate, tri(4-isopropylphenyl) phosphate, tri(2,6 In some embodiments, the phosphate compound is bisphenol A bis (phenyl phosphate), resorcinol bis [bis (2,6-dimethylphenyl) phosphate], and / or resorcinol bis (diphenyl phosphate).

[0045] In some embodiments, the phosphazene compound and the phosphate compound can be used alone as a flame retardant, 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.

[0046] The proportion of the phosphorus-containing flame retardant in the total mass of the flame retardant material (or referred to as the mass proportion) can be 2-20%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant can be 3-16%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant can be 4-12%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant can be 5-10%. Optionally or preferably, the mass proportion of the phosphorus-containing flame retardant can be 6-8%. Alternatively, the mass proportion of the phosphorus-containing flame retardant can be any value within the numerical range as described above, for example, 6%, 7%, 8%, 9%, 10%, 12%, 15%, etc.

[0047] In some embodiments, the phosphorus-containing flame retardant is one or more of the phosphate compounds. In this case, the mass proportion of the phosphate compounds is 2-20%. In some embodiments, the phosphorus-containing flame retardant is a combination of phosphazene compounds and phosphate compounds. In this case, the mass proportion of the phosphorus-containing flame retardant is 4-12%.

[0048] The flame retardant material may include other additives such as antioxidants, 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.

[0049] In terms of mass, the mass proportion of the antioxidant in the flame retardant material can 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 antioxidant can be any value within the above numerical range, for example, 0.3%.

[0050] Other additives included in the flame retardant material may include lubricants. The lubricant can improve the processing performance, 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, talc, polyethylene wax, ethylene glycol distearate, stearamide, ethylene bis stearamide, silicone oil, silicone powder, oxidized polyethylene wax, castor oil derivatives, lauramide, stearic acid glyceryl ester, pentaerythritol stearate, polypropylene wax, distearate propylene glycol ester, beeswax, paraffin, etc. or any combination thereof. Similarly, by mass, the mass proportion of the lubricant in the flame retardant material 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%.

[0051] 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.

[0052] The present application also discloses a method for preparing the flame retardant material, which may include the following exemplary steps.

[0053] In the first step, according to the mass proportion of each component of the flame retardant material, each component is placed in a mixing device and mixed evenly to obtain a mixture.

[0054] In some embodiments, the components of the flame retardant material can be placed in a mixing device for blending after weighing 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, triazine compounds, antioxidants, lubricants and other additives (if any) can be first 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.

[0055] 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.

[0056] 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, including single-screw extruders, twin-screw extruders, conical twin-screw extruders, multi-screw extruders, planetary screw extruders, etc. After the components used to constitute 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.

[0057] 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., performance improvement), coloring (e.g., to meet the eyeballs of a specific color), metering packaging (e.g., to facilitate storage and transportation), etc. One or more.

[0058] 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.

[0059] 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.

[0060] Example 1 - Preparation of flame retardant material

[0061] In this embodiment, the thermoplastic polymer is polycarbonate (mass ratio is 64.4%); the reinforcing material is a glass fiber composite, the glass fiber composite is flat glass fiber, and the flat ratio is 1:4; the phosphorus-containing flame retardant is bisphenol A bis (phenyl phosphate); the triazine compound is poly [[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazine diyl]; the above components are taken according to the mass ratio of 64.4:20:12:3, 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 1.

[0062] The preparation process is as follows:

[0063] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, triazine compound 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.

[0064] Example 2 - Preparation of flame retardant materials

[0065] Compared with Example 1, Example 2 differs in the selection and mass proportion of the phosphorus-containing flame retardant and the mass proportion of the polycarbonate.

[0066] In this embodiment, the thermoplastic polymer is polycarbonate (mass ratio is 66.4); the reinforcing material is a glass fiber composite, the glass fiber composite is flat glass fiber, and the flat ratio is 1:4; the phosphorus-containing flame retardant is resorcinol bis(diphenyl phosphate); the triazine compound is poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazinediyl]; the above components are taken according to the mass ratio of 66.4:20:10:3, 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 1.

[0067] The preparation process is as follows:

[0068] The above raw materials are mixed evenly by a mixer. First, polycarbonate, phosphorus-containing flame retardant, triazine compound 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.

[0069] Example 3 - Preparation of flame retardant materials

[0070] Compared with Example 1, Example 3 differs in the selection and mass proportion of the phosphorus-containing flame retardant.

[0071] In this embodiment, the thermoplastic polymer is polycarbonate (mass ratio is 64.4); the reinforcing material is a glass fiber composite, the glass fiber composite is flat glass fiber, and the flat ratio is 1:4; the phosphorus-containing flame retardant is resorcinol bis[di(2,6-dimethylphenyl) phosphate]; the triazine compound is poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazine diyl]; the above components are taken according to the mass ratio of 64.4:20:12:3, 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 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, triazine compound 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 4 Preparation of flame retardant material

[0075] Compared with Example 1, Example 4 differs in that the mass proportions of polycarbonate and triazine compounds are different.

[0076] In this embodiment, the thermoplastic polymer is polycarbonate (mass ratio is 67.2%); the reinforcing material is a glass fiber composite, the glass fiber composite is flat glass fiber, and the flat ratio is 1:4; the phosphorus-containing flame retardant is bisphenol A bis (phenyl phosphate); the triazine compound is poly [[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazine diyl]; the above components are taken according to the mass ratio of 67.2:20:12:0.2, 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 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, triazine compound 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 5 Preparation of flame retardant material

[0080] Compared with Example 1, Example 5 differs in that the mass proportions of polycarbonate and triazine compounds are different.

[0081] In this embodiment, the thermoplastic polymer is polycarbonate (mass ratio is 57.4%); the reinforcing material is a glass fiber composite, the glass fiber composite is flat glass fiber, and the flat ratio is 1:4; the phosphorus-containing flame retardant is bisphenol A bis (phenyl phosphate); the triazine compound is poly [[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazine diyl]; the above components are taken according to the mass ratio of 57.4:20:12:10, 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 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, triazine compound 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] Comparative Example 1-Preparation of flame retardant material

[0085] Compared with Example 1, Comparative Example 1 differs in that no triazine compound is added, and the mass proportion of the thermoplastic polymer is different.

[0086] In Comparative Example 1, the mass proportion of the thermoplastic polymer is 67.4%; the thermoplastic polymer, the glass fiber composition, the phosphorus-containing flame retardant, the antioxidant and the lubricant are taken in a mass ratio of 67.4:20:12:0.3:0.3. The specific mass proportions are shown in Table 1.

[0087] The preparation process is as follows:

[0088] The above raw materials are mixed evenly by a mixer. First, the thermoplastic polymer, 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.

[0089] Comparative Example 2-Preparation of flame retardant material

[0090] Compared with Example 2, Comparative Example 2 differs in that no triazine compound is added and the mass proportion of the thermoplastic polymer is different.

[0091] In Comparative Example 2, the mass proportion of the thermoplastic polymer is 69.4%; the thermoplastic polymer, glass fiber composition, phosphorus-containing flame retardant, antioxidant and lubricant are taken according to the mass proportion of 69.4:20:10:0.3:0.3. The specific mass proportions are shown in Table 1.

[0092] The preparation process is as follows:

[0093] The above raw materials are mixed evenly by a mixer. First, the thermoplastic polymer, 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.

[0094] Comparative Example 3-Preparation of flame retardant material

[0095] Compared with Example 3, Comparative Example 3 differs in that no triazine compound is added, and the mass proportion of the thermoplastic polymer is different.

[0096] In Comparative Example 3, the mass proportion of the thermoplastic polymer is 67.4%; the thermoplastic polymer, glass fiber composition, phosphorus-containing flame retardant, antioxidant and lubricant are taken according to the mass proportion of 67.4:20:12:0.3:0.3. The specific mass proportions are shown in Table 1.

[0097] The preparation process is as follows:

[0098] The above raw materials are mixed evenly by a mixer. First, the thermoplastic polymer, 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.

[0099] Comparative Example 4-Preparation of flame retardant material

[0100] Compared with Example 3, Comparative Example 4 differs in that no triazine compound is added, and the mass proportions of the thermoplastic polymer and the phosphorus-containing flame retardant are different.

[0101] In Comparative Example 3, the mass proportion of the thermoplastic polymer is 64.4%; the thermoplastic polymer, glass fiber composition, phosphorus-containing flame retardant, antioxidant and lubricant are taken according to the mass proportion of 64.4:20:15:0.3:0.3. The specific mass proportions are shown in Table 1.

[0102] The preparation process is as follows:

[0103] The above raw materials are mixed evenly by a mixer. First, the thermoplastic polymer, 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.

[0104] Flame retardant grade test

[0105] The flame retardant grade of the products prepared from the flame retardant materials obtained in Examples 1-5 and Comparative Examples 1-4 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 Table 1.

[0106] Tensile strength and elongation at break test

[0107] The products made of the flame retardant materials obtained in Examples 1-5 and Comparative Examples 1-4 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 was taken after testing 5 pieces. The test results are summarized in Table 1.

[0108] Charpy notched impact test

[0109] The products made of the flame retardant materials obtained in Examples 1-5 and Comparative Examples 1-4 were subjected to a simple beam notched impact test: the impact test bars were notched according to ISO 179 and then tested at a test temperature of 23° C. Ten bars were tested and the average value was taken. The test results are summarized in Table 1.

[0110] Table 1 Composition and test results of flame retardant materials

[0111]

[0112]

[0113] It can be seen from Table 1 above that the flame retardant material provided in the embodiment of the present application can achieve a higher flame retardant grade (1mm flame retardant grade V-0) than the comparative example, and has a better flame retardant effect than using the phosphate flame retardant alone. Moreover, the tensile strength and elongation at break do not degrade 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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: The triazine compound is used as a carbon-forming agent for the flame retardant material; the mass proportion of the triazine compound in the flame retardant material is 0.2-10%.

2. The flame retardant material according to claim 1, characterized in that: The triazine compounds include one or more of 1,3,5-triazine, 2,4,6-tris(N-hydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N-hydroxymethyl-N-hydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N,N-dihydroxymethylamino)-1,3,5-triazine, 2,4,6-tris(N,N-dimethoxyamino)-1,3,5-triazine, poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazinediyl], etc.

3. The flame retardant material according to claim 2, characterized in that: The triazine compound is poly[[6-(4-morpholinyl)-1,3,5-triazine-2,4-diyl]-1,4-piperazinediyl].

4. The flame retardant material according to claim 1, characterized in that: The flame retardant material further comprises: Polycarbonate; Reinforcement materials; and Phosphorus-containing flame retardants; The mass ratios of the PC, the reinforcing material, the phosphorus-containing flame retardant, and the triazine compound in the flame retardant material are (30-80): (10-50): (2-20): (0.2-10).

5. The flame retardant material according to claim 4, characterized in that: 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 1-40 g / 10 min, and the melt index of the branched polycarbonate is 2-15 g / 10 min.

6. The flame retardant material according to claim 4, characterized in that: The reinforcing material comprises one or more of a glass fiber composite, carbon fiber, and metal fiber; and the carbon fiber contains at least 30% recycled material.

7. The flame retardant material according to claim 6, characterized in that: The glass fiber composition comprises flat glass fibers and / or round glass fibers, the mass ratio of the flat glass fibers to the round glass fibers is 1:(0.05-0.3); the flatness ratio of the flat glass fibers is 1:3-1:4, and the diameter of the round glass fibers is 7-13 microns.

8. The flame retardant material according to claim 4, characterized in that: The phosphorus-containing flame retardant includes one or more phosphate compounds; the phosphate compounds are selected from one or more of bisphenol A bis(phenyl phosphate), resorcinol bis(diphenyl phosphate), and resorcinol bis[bis(2,6-dimethylphenyl)phosphate].

9. The flame retardant material according to claim 4, 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.

10. The flame retardant material according to claim 4, 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.

11. A method for preparing a flame retardant material according to any one of claims 1 to 10, characterized in that: The preparation method comprises: According to the mass proportion 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.

12. A product, wherein the product is made of the flame retardant material according to any one of claims 1 to 11.

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