Use of a silicone polymer in plastic flame retardation

Abstract

The application relates to the technical field of flame-retardant materials, in particular to application of an organic silicon polymer in plastic flame retardation, wherein the plastic is at least one selected from polypropylene plastic, polyethylene plastic, polycarbonate plastic, polystyrene plastic, nylon or EVA. The silicon-oxygen bond in the organic silicon polymer has high compatibility with inorganic substances or organic substances, the flame retardation of the plastic material can promote the compatibility of the inorganic flame retardant and the organic plastic matrix, the flame retardant is uniformly dispersed in the plastic matrix, the flame retardation of the plastic product is improved, and meanwhile, the plastic product can have excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of flame retardant materials technology, specifically to the application of an organosilicon polymer in flame retardant plastics. Background Technology

[0002] Flame retardants have become a major driving force in the development of polymer materials, second only to plasticizers in usage. Currently, the most commonly used flame retardants in polymers are halogen-based and phosphorus-based. Halogen-based flame retardants, however, produce harmful gases during combustion, thus limiting their application in certain fields. Developing new, highly efficient, and low-toxicity halogen-free flame retardants has become a hot topic in current flame retardant research. Because phosphorus-based flame retardants have many advantages, initially, people pinned their hopes for achieving halogen-free flame retardants on organophosphorus flame retardants, promoting their development. However, it has been proven that organophosphorus flame retardants also have certain drawbacks, such as high polarity, hygroscopicity, poor high-temperature resistance, and high smoke production.

[0003] Silicon is a non-toxic element, and organosilicon flame retardants possess advantages such as high efficiency, low toxicity, environmental friendliness, and good thermal stability. In addition to imparting excellent flame retardant properties to the substrate, they can also improve the substrate's mechanical and heat resistance properties. Furthermore, organosilicon flame retardants have minimal impact on the processing and physical properties of plastics and rubber. However, existing organosilicon flame retardants produce large amounts of smoke and are highly volatile during combustion, exhibiting relatively poor stability and a low limiting oxygen index of only 20-30%. Therefore, there is a need to find a novel organosilicon flame retardant, especially one applicable to flame-retardant materials in polymers. Summary of the Invention

[0004] This invention is based on the inventor's discovery and understanding of the following facts and problems: existing flame retardants cannot meet the actual flame retardant requirements, especially in plastic materials such as polypropylene (PP) plastics, polyethylene (PE) plastics, polycarbonate (PC) plastics, nylon, and EVA, where their performance is unsatisfactory.

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose the application of an organosilicon polymer in plastic flame retardancy, a composite flame retardant, and fire-resistant plastics. By utilizing the compatibility of organosilicon polymers with organic or inorganic substances, it can be compounded with existing flame retardants, and its application in plastic flame retardancy can effectively improve the flame retardancy of plastics.

[0006] An application of an organosilicon polymer in flame retardant plastics according to an embodiment of the present invention, wherein the organosilicon polymer comprises the structure of the general formula shown in Formula I.

[0007]

[0008] R1, R2, R4, R5, R6, and R7 are each independently selected from at least one of the following: optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted alkenyl, optionally substituted cycloalkenyl, optionally substituted heterocyclic, optionally substituted phenyl, and optionally substituted heteroaryl.

[0009] R3 and R8 are each independently selected from at least one of the following: optionally substituted alkyl, optionally substituted alkenyl, optionally substituted cycloalkenyl, optionally substituted heterocyclic, optionally substituted aryl, optionally substituted heteroaryl, and optionally substituted cyclohexyl.

[0010] m can independently take any value between 2 and 3,000,000, and n can independently take any value between 0 and 3,000,000.

[0011] The advantages and technical effects of the application of organosilicon polymers in flame retardant plastics according to embodiments of the present invention are as follows: 1. In the application of the present invention, the organosilicon polymers used contain a large number of silicon-oxygen bonds in their chemical structure. The silicon dioxide generated after combustion can prevent the combustion material from burning further. In addition, some silicon atoms in the eight-membered ring structure are connected to multiple oxygen atoms, making it easier to form silicon dioxide after combustion, which further improves the flame retardancy of the organosilicon polymers; 2. The silicon-oxygen bonds in organosilicon polymers have high compatibility with both inorganic and organic substances. When used for flame retardant plastic materials, they can promote the compatibility between inorganic flame retardants and organic plastic matrices, allowing the flame retardants to be uniformly dispersed in the plastic matrix. This not only improves the flame retardancy of plastic products but also allows the plastic products to basically maintain their original mechanical properties.

[0012] In some embodiments of the present invention, the plastic is selected from at least one of polypropylene (PP) plastic, polyethylene (PE) plastic, polycarbonate (PC) plastic, polystyrene (PS) plastic, nylon or EVA.

[0013] In some embodiments of the present invention, R3 and R8 are each independently selected from at least one of optionally substituted alkyl, optionally substituted alkenyl, or optionally substituted aryl.

[0014] In some embodiments of the invention, R1-R8 may be optionally substituted with halogen-free groups.

[0015] In some embodiments of the present invention, the organosilicon polymer is compounded with a flame retardant.

[0016] An embodiment of the present invention provides a composite flame retardant for plastic flame retardancy, comprising a flame retardant and the aforementioned organosilicon polymer.

[0017] The advantages and technical effects of the composite flame retardant for plastics in this invention are as follows: 1. The silicon-oxygen bonds in the organosilicon polymer in this invention have high compatibility with both inorganic and organic substances. When used for flame retardancy of plastic materials, it can promote the compatibility between the inorganic flame retardant and the organic plastic matrix, so that the flame retardant is uniformly dispersed in the plastic matrix, improving the flame retardancy and fire resistance of plastic products, while also allowing the plastic products to basically maintain their original mechanical properties; 2. The composite flame retardant of this invention is mainly composed of inorganic flame retardants, supplemented by organosilicon polymers, which greatly reduces the cost of raw materials while ensuring the flame retardant effect.

[0018] In some embodiments of the present invention, the flame retardant includes inorganic flame retardants and organic flame retardants.

[0019] In some embodiments of the present invention, the mass ratio of the organosilicon polymer to the flame retardant is 1:(0-1000).

[0020] A fire-resistant plastic according to an embodiment of the present invention includes the above-mentioned organosilicon polymer or the above-mentioned composite flame retardant, and a plastic substrate.

[0021] The advantages and technical effects of the fire-resistant plastics in this invention are as follows: 1. The organosilicon polymer in this invention contains a large number of silicon-oxygen bonds in its chemical structure. The silicon dioxide generated after combustion can prevent the combustion material from burning further. In addition, some silicon atoms in the eight-membered ring structure are connected to multiple oxygen atoms, making it easier to form silicon dioxide after combustion, which further improves the flame retardancy of the organosilicon polymer. When incorporated into plastic materials, it can improve the flame retardancy of the plastic materials. 2. The silicon-oxygen bonds in the organosilicon polymer in this invention have high compatibility with both inorganic and organic substances. When used for flame retardancy of plastic materials, it can improve the compatibility between existing inorganic flame retardants and organic plastic matrices, so that the flame retardant is uniformly dispersed in the plastic matrix, improving the flame retardancy of plastic products and maintaining excellent mechanical properties. 3. The composite flame retardant of this invention is mainly composed of inorganic flame retardants, supplemented by organosilicon polymers, which ensures the flame retardant effect while greatly reducing the raw material cost.

[0022] In some embodiments of the present invention, the mass percentage of the composite flame retardant is 0.01%-60% based on the total mass of the fire-resistant plastic;

[0023] And / or, when the refractory plastic does not contain the flame retardant, the mass percentage of the organosilicon polymer is 0.01%-10% based on the total mass of the refractory plastic;

[0024] And / or, the plastic is selected from at least one of polypropylene plastic, polyethylene plastic, polycarbonate plastic, polystyrene plastic, nylon or EVA. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] An application of an organosilicon polymer in flame retardant plastics according to an embodiment of the present invention, wherein the organosilicon polymer comprises the structure of the general formula shown in Formula I.

[0027]

[0028] R1, R2, R4, R5, R6, and R7 are each independently selected from at least one of the following: optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted alkenyl, optionally substituted cycloalkenyl, optionally substituted heterocyclic, optionally substituted phenyl, and optionally substituted heteroaryl.

[0029] R3 and R8 are each independently selected from at least one of the following: optionally substituted alkyl, optionally substituted alkenyl, optionally substituted cycloalkenyl, optionally substituted heterocyclic, optionally substituted aryl, optionally substituted heteroaryl, and optionally substituted cyclohexyl.

[0030] m independently takes any value between 2 and 3,000,000, and n independently takes any value between 0 and 3,000,000;

[0031] The organosilicon polymer containing an octagonal silicon-oxygen ring in this embodiment of the invention is the organosilicon polymer disclosed in CN107759791A, and is obtained by the preparation method disclosed in CN107759791A.

[0032] The application of organosilicon polymers in flame retardant plastics according to embodiments of the present invention has the following advantages: the chemical structure of organosilicon polymers contains a large number of silicon-oxygen bonds, and the silicon dioxide generated after combustion can prevent the combustion material from burning further. In addition, some silicon atoms in the eight-membered ring structure are connected to multiple oxygen atoms, making it easier to form silicon dioxide after combustion, which further improves the flame retardancy of organosilicon polymers. The silicon-oxygen bonds in organosilicon polymers have high compatibility with both inorganic and organic substances. When used for flame retardant plastic materials, they can promote the compatibility between inorganic flame retardants and organic plastic matrices, so that the flame retardants are uniformly dispersed in the plastic matrix. This not only improves the flame retardancy of plastic products, but also allows plastic products to basically maintain their original mechanical properties.

[0033] In some embodiments of the present invention, preferably, n independently takes any value between 0 and 300, and more preferably between 0 and 100. In the application of the embodiments of the present invention, n can be 0 or not 0; preferably, n is 0, the organosilicon polymer is a cyclic polymer, and its flame retardancy is further improved.

[0034] In some embodiments of the present invention, the plastic is selected from at least one of polypropylene (PP) plastic, polyethylene (PE) plastic, polycarbonate (PC) plastic, polystyrene (PS) plastic, nylon or EVA.

[0035] In some embodiments of the present invention, R3 and R8 are each independently selected from at least one of optionally substituted alkyl, optionally substituted alkenyl, or optionally substituted aryl groups. In the synthesis and preparation of the organosilicon polymers in the embodiments of the present invention, the introduction of the two groups R3 and R8 is relatively easy, the synthesis is less difficult, and flame-retardant groups can also be introduced, preferably optionally substituted aryl groups.

[0036] In some embodiments of the present invention, R1-R8 are optionally replaced by halogen-free groups. In applications of the present invention, no harmful gases are produced during combustion, and the flame-retardant effect of the organosilicon polymer is halogen-independent, exhibiting low toxicity and environmental friendliness, thus meeting the requirements of green development.

[0037] In some embodiments of the present invention, the organosilicon polymer is compounded with a flame retardant. In the application of the present invention, the organosilicon polymer can not only be used alone as a flame retardant due to its inherent flame-retardant properties, but also can be compounded with a flame retardant due to its compatibility with organic or inorganic substances, promoting uniform dispersion of the flame retardant in the plastic substrate and enhancing the flame-retardant effect.

[0038] An embodiment of the present invention provides a composite flame retardant for plastic flame retardancy, comprising a flame retardant and the aforementioned organosilicon polymer.

[0039] This invention discloses a composite flame retardant for plastics. The silicon-oxygen bonds in the organosilicon polymer have high compatibility with both inorganic and organic substances. When used for flame retardancy in plastic materials, it promotes the compatibility between the inorganic flame retardant and the organic plastic matrix, allowing the flame retardant to be uniformly dispersed in the plastic matrix, thereby improving the flame retardancy and fire resistance of the plastic product, while also enabling the plastic product to maintain its original mechanical properties. The composite flame retardant of this invention is mainly composed of inorganic flame retardants, supplemented by organosilicon polymers, which ensures the flame retardant effect while significantly reducing raw material costs.

[0040] In some embodiments of the present invention, the flame retardant includes inorganic flame retardants and organic flame retardants; preferably, the inorganic flame retardant is selected from at least one of aluminum hydroxide, magnesium hydroxide, borate or phosphate, and the organic flame retardant is selected from at least one of melamine pyrophosphate, triethyl phosphate, melamine cyanurate, melamine or tricresyl phosphate.

[0041] In some embodiments of the present invention, the mass ratio of the organosilicon polymer to the flame retardant is 1:(0-1000).

[0042] A fire-resistant plastic according to an embodiment of the present invention includes the above-mentioned organosilicon polymer or the above-mentioned composite flame retardant, and a plastic substrate.

[0043] The fire-resistant plastic of this invention contains a large number of silicon-oxygen bonds in the chemical structure of the organosilicon polymer. The silica generated after combustion can prevent further combustion of the burning material. In addition, some silicon atoms in the eight-membered ring structure are connected to multiple oxygen atoms, making it easier to form silica after combustion, which further improves the flame retardancy of the organosilicon polymer. When incorporated into plastic materials, it can improve the flame retardancy of the plastic materials. The silicon-oxygen bonds in the organosilicon polymer have high compatibility with both inorganic and organic substances. When used for flame retardancy in plastic materials, it can improve the compatibility between existing inorganic flame retardants and organic plastic matrices, so that the flame retardant is uniformly dispersed in the plastic matrix, improving the flame retardancy of plastic products and maintaining excellent mechanical properties. The composite flame retardant of this invention is mainly composed of inorganic flame retardants, supplemented by organosilicon polymers, which ensures the flame retardant effect while greatly reducing the raw material cost.

[0044] In some embodiments of the present invention, the mass percentage of the composite flame retardant is 0.01%-60% based on the total mass of the fire-resistant plastic;

[0045] Preferably, when the refractory plastic does not contain the flame retardant, that is, when the organosilicon polymer is added to the plastic alone without being compounded, the mass percentage of the organosilicon polymer is 0.01%-10% based on the total mass of the refractory plastic; the organosilicon polymer in the embodiments of the present invention has excellent flame retardant properties, and a small amount can achieve excellent flame retardant effect.

[0046] Preferably, the plastic is selected from at least one of polypropylene, polyethylene, polycarbonate, polystyrene, nylon, or EVA. The silicone polymers and composite flame retardants of the present invention are suitable for flame retardancy of a variety of plastic materials.

[0047] The present invention will now be described in detail with reference to the embodiments.

[0048] Example 1

[0049] Preparation of organosilicon polymer: An organosilicon polymer having the general formula shown in Formula I was prepared by the method disclosed in Example 8 of the specification of patent CN107759791A, wherein R1, R2, R4, R5, R6, and R7 are methyl, R3 is phenyl, R8 is phenyl, m = 555, and n = 0. The resulting organosilicon polymer is denoted as I-1.

[0050] Preparation of composite flame retardant: Weigh 4g of organosilicon polymer I-1 and 56g of aluminum hydroxide, mix them evenly to prepare composite flame retardant Z-1.

[0051] Preparation of fire-resistant polyethylene plastic: Weigh 14g LLDPE8320, 18g EVA7470, 60g composite flame retardant Z-1, 8g maleic anhydride-grafted ethylene-octene copolymer, 0.5g carbon fiber, and 0.4g fumed silica. Put them into a stirrer and stir. Put the well-mixed raw materials into a Hefujie 36 mixer and stir and mix them at 280-290℃ to obtain fire-resistant polyethylene plastic, denoted as PE-1.

[0052] The refractory plastic prepared in this embodiment has a tensile strength of 61.71 MPa, a flexural strength of 82.67 MPa, and an impact toughness of 18.85 KJ / m. 2 .

[0053]

[0054] Example 2

[0055] Preparation of organosilicon polymer: An organosilicon polymer having the general formula shown in Formula I was prepared by the method disclosed in Example 7 of the specification of patent CN107759791A, wherein R1, R2, R4, R5, R6, and R7 are methyl, R3 is phenyl, R8 is dodecyl, m = 47, and n = 0, to obtain organosilicon polymer I-2.

[0056] Preparation of composite flame retardant and fire-resistant polyethylene plastic: The preparation method is the same as in Example 1, except that organosilicon polymer I-2 is used instead of organosilicon polymer I-1 to prepare composite flame retardant Z-2 and fire-resistant polyethylene plastic PE-2, respectively.

[0057] Example 3

[0058] Preparation of composite flame retardant: Weigh 2g of organosilicon polymer I-1 and 22g of halogen-free intumescent flame retardant EPFR-110DN with non-polyphosphate ammonium as acid source, mix them evenly to prepare composite flame retardant Z-3.

[0059] Preparation of refractory polypropylene plastic: Weigh 75.6g of copolymer PP-K8003, 0.2g of sodium benzoate nucleating agent, 0.2g of antioxidant, 24g of composite flame retardant Z-3, and 0.2g of fumed silica. Put them into a stirrer and stir. Put the well mixed raw materials into a Hefujie 36 machine and stir and mix at 280-290℃ to obtain refractory polypropylene plastic, denoted as PP-3.

[0060] The refractory plastic prepared in this embodiment has a tensile strength of 58.66 MPa, a flexural strength of 78.69 MPa, and an impact toughness of 17.36 KJ / m. 2 .

[0061] Example 4

[0062] Preparation of organosilicon polymer: An organosilicon polymer having the general formula shown in Formula I was prepared by the method disclosed in Example 10 of the specification of patent CN107759791A, wherein R1, R2, R4, R5, R6, and R7 are methyl, R3 is phenyl, R8 is vinyl, m = 37, and n = 0. The resulting organosilicon polymer is denoted as I-4.

[0063] Preparation of composite flame retardant: Weigh 2g of organosilicon polymer I-4 and 22g of aluminum hydroxide, mix them evenly to prepare composite flame retardant Z-4.

[0064] Preparation of refractory polypropylene plastic: Weigh 75.6g of copolymer PP-K8003, 0.2g of sodium benzoate nucleating agent, 0.2g of antioxidant, 24g of composite flame retardant Z-4, and 0.2g of fumed silica. Put them into a stirrer and stir. Put the well mixed raw materials into a Hefujie 36 machine and stir and mix at 280-290℃ to obtain refractory polypropylene plastic, denoted as PP-4.

[0065]

[0066] Example 5

[0067] Preparation of composite flame retardant: Weigh 0.7g of organosilicon polymer I-1 and 0.2g of flame retardant potassium diphenyl sulfonate, mix them evenly to prepare composite flame retardant Z-5.

[0068] Preparation of refractory polycarbonate plastic: Weigh 100g PCIR2200, 0.03g antioxidant 1076, 0.9g composite flame retardant Z-5, 0.1g antioxidant B125, and 0.2g fumed silica, put them into a Hefujie 36 mixer, and stir and mix them at 280-290℃ to obtain refractory polycarbonate plastic, denoted as PC-5.

[0069] Example 6

[0070] Preparation of organosilicon polymer: An organosilicon polymer having the general formula shown in Formula I was prepared by the method disclosed in Example 2 of the specification of patent CN107759791A, wherein R1, R2, R4, R5, R6, and R7 are methyl, R3 is vinyl, R8 is phenyl, m = 62, and n = 0. The resulting organosilicon polymer is denoted as I-6.

[0071] Preparation of composite flame retardant: Weigh 0.7g of organosilicon polymer I-6 and 0.2g of potassium diphenyl sulfonate, mix them evenly to prepare composite flame retardant Z-6.

[0072] Preparation of refractory polycarbonate plastic: Weigh 100g PCIR2200, 0.03g antioxidant 1076, 0.9g composite flame retardant Z-6, 0.1g antioxidant B125, and 0.2g fumed silica, put them into a Hefujie 36 mixer, and stir and mix them at 280-290℃ to obtain refractory polycarbonate plastic, denoted as PC-6.

[0073]

[0074] Example 7

[0075] The preparation method is the same as in Example 1, except that in the preparation of fire-resistant polyethylene plastic, 10g of organosilicon polymer I-1 is used instead of 60g of composite flame retardant Z-1, and the resulting fire-resistant polyethylene plastic is denoted as PE-7.

[0076] Example 8

[0077] The preparation method is the same as in Example 1, except that the prepared organosilicon polymer has the general formula shown in Formula I, where n = 20. The prepared organosilicon polymer, composite flame retardant and fire-resistant polyethylene plastic are respectively denoted as I-8, Z-8 and PE-8.

[0078] Example 9

[0079] Preparation of organosilicon polymer: An organosilicon polymer having the general formula shown in Formula I was prepared using the method disclosed in patent CN107759791A, wherein R1, R2, R4, R5, R6, and R7 are methyl groups, and R3 is a methyl group. R8 is a phenyl group, m = 62, n = 0, and an organosilicon polymer, denoted as I-9, is prepared by adding [a specific ingredient] in the preparation method. Introduce R3;

[0080] Preparation of composite flame retardant: Weigh 0.7g of organosilicon polymer I-9 and 0.2g of potassium diphenyl sulfonate, mix them evenly to prepare composite flame retardant Z-9.

[0081] Preparation of refractory polycarbonate plastic: Weigh 100g PCIR2200, 0.03g antioxidant 1076, 0.9g composite flame retardant Z-9, 0.1g antioxidant B125, and 0.2g fumed silica, put them into a Hefujie 36 mixer, and stir and mix them at 280-290℃ to obtain refractory polycarbonate plastic, denoted as PC-9.

[0082] The refractory plastic prepared in this embodiment has a tensile strength of 84.3 MPa, a flexural strength of 128.5 MPa, and an impact toughness of 7.8 KJ / m. 2 .

[0083] Example 10

[0084] Preparation of organosilicon polymer: An organosilicon polymer having the general formula shown in Formula I was prepared by the method disclosed in the specification of patent CN107759791A, wherein R1, R2, R4, R5, R6, and R7 are methyl, R3 is dodecyl, R8 is dodecyl, m = 32, and n = 0. The resulting organosilicon polymer is denoted as I-10.

[0085] Preparation of composite flame retardant: Weigh 0.7g of organosilicon polymer I-10 and 0.2g of potassium diphenyl sulfonate, mix them evenly to prepare composite flame retardant Z-10.

[0086] Preparation of refractory polycarbonate plastic: Weigh 100g PCIR2200, 0.03g antioxidant 1076, 0.9g composite flame retardant Z-9, 0.1g antioxidant B125, and 0.2g fumed silica, put them into a Hefujie 36 machine, and stir and mix them at 280-290℃ to obtain refractory polycarbonate plastic, denoted as PC-10.

[0087] Comparative Example 1

[0088] A polyethylene plastic was prepared using the same method as in Example 1, except that no composite flame retardant Z-1 was added. The resulting polyethylene plastic was designated PE-1-1.

[0089] The plastic in Comparative Example 1 has a tensile strength of 64.02 MPa, a flexural strength of 83.89 MPa, and an impact toughness of 19.77 KJ / m. 2 .

[0090] Comparative Example 2

[0091] The preparation method is the same as in Example 1, except that 60g of aluminum hydroxide is used instead of 60g of composite flame retardant Z-1 in the preparation of fire-resistant polyethylene plastic, that is, no organosilicon polymer I-1 is added. The resulting fire-resistant polyethylene plastic is denoted as PE-1-2.

[0092] The refractory plastic prepared in Comparative Example 2 exhibits localized white spots, a phenomenon caused by uneven distribution of aluminum hydroxide. Its tensile strength is 54.02 MPa, flexural strength is 67.88 MPa, and impact toughness is 15.74 KJ / m. 2 .

[0093] Flame retardancy tests were conducted on the organosilicon polymers, composite flame retardants, and fire-resistant plastics used in the above examples and comparative examples. According to the national standard GB2409-84 test method, five groups of samples from each example / comparative example were tested for flame retardancy. Each group of samples underwent two flame retardancy tests, with extinguishing times of t1 and t2, respectively. The cumulative time for the five groups of samples was recorded as tf. The test results are shown in Table 1.

[0094] Table 1

[0095]

[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0097] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0098] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A composite flame retardant for plastics, characterized in that, It includes flame retardants and silicone polymers, wherein the silicone polymers have a structure of the general formula shown in Formula I. Where R1, R2, R4, R5, R6, and R7 are methyl groups; R3 and R8 are phenyl groups; m=555, n=0; The flame retardant is an inorganic flame retardant.

2. The composite flame retardant according to claim 1, characterized in that, The mass ratio of the organosilicon polymer to the flame retardant is 1:(0-1000).

3. A fire-resistant plastic, characterized in that, It includes a plastic substrate and a composite flame retardant as described in any one of claims 1-2.

4. The refractory plastic according to claim 3, characterized in that, Based on the total mass of the fire-resistant plastic, the mass percentage of the composite flame retardant is 0.01-60%; And / or, when the refractory plastic does not contain the flame retardant, the mass percentage of the organosilicon polymer is 0.01-10% based on the total mass of the refractory plastic; And / or, the plastic is selected from at least one of polypropylene plastic, polyethylene plastic, polycarbonate plastic, polystyrene plastic, nylon or EVA.

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