Thermoplastic with excellent flame retardant property and preparation method thereof

Abstract

The invention discloses a thermoplastic plastic with excellent flame retardant property and a preparation method thereof, the flame retardant thermoplastic plastic composite material comprises the following components by weight: 90-100 parts of thermoplastic plastic; 15 to 17 parts of a flame retardant; 3-5 parts of a synergistic flame retardant; 0.1 to 0.5 part of an antioxidant; wherein the flame retardant is WR02, and the synergistic flame retardant is EGMA-g-TiO2 (ethylene glycol monomethyl methacrylate). The synthesized EGMA-g-TiO2 can be used as an interfacial compatibilizer of the thermoplastic plastic and the flame retardant WR02, and the dispersion of the flame retardant WR02 in the thermoplastic plastic is improved, so that the flame retardant property of the thermoplastic plastic is improved; a continuous and compact titanium-containing protective layer can be formed on an interface to better isolate heat and oxygen, so that flammable thermoplastic plastic is prevented from being decomposed, and a better synergistic flame-retardant effect is achieved with WR02.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical materials, and in particular to a thermoplastic plastic with excellent flame retardancy and a preparation method thereof. Background Art

[0002] Thermoplastics are widely used in automotive manufacturing, electronics, construction, and building materials due to their advantages such as easy processing and stable mechanical properties. However, their flammability limits their application in high-end applications, and improving their flame retardancy has become a key technical challenge in the industry.

[0003] Existing flame retardant technologies primarily utilize halogen flame retardants, phosphorus-based flame retardants, and metal oxide flame retardants. While halogen flame retardants offer high flame retardancy, they release toxic gases during combustion, making them incompatible with environmental protection. Traditional phosphorus-based flame retardants suffer from insufficient thermal stability and poor compatibility with polymers, which can lead to a decrease in the mechanical properties of the material. While single metal oxides (such as titanium dioxide) can block heat and oxygen to a certain extent, they have weak interfacial bonding with polymers, poor dispersion uniformity, and limited synergistic flame retardant effects.

[0004] Flame retardancy is one of the important properties of automotive interior and exterior decorative parts, plastic housings, etc. There are many methods to improve the flame retardancy of polymers. The present invention innovatively produces a thermoplastic plastic with excellent flame retardancy and a preparation method thereof, which improves the flame retardancy of existing thermoplastic plastics. This composite flame retardant has not been reported so far, and the present invention has very important practical significance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a thermoplastic plastic with excellent flame retardant properties and a preparation method thereof, so as to solve the problem that the existing thermoplastic plastic has insufficient flame retardant properties.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] A flame retardant thermoplastic composite material comprises the following components in parts by weight:

[0008]

[0009] Wherein, the flame retardant is WR02, and the synergistic flame retardant is EGMA-g-TiO2.

[0010] Preferably, in the above technical solution, the method for preparing the synergistic flame retardant comprises the following steps:

[0011] (1) Weigh a certain amount of ammonia water, titanium dioxide, KH570, anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 30-60°C for 6-8 hours, filter, wash, and dry to obtain amino titanium dioxide;

[0012] (2) Weigh a certain amount of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 50-60°C for 7-8 hours, filter, wash, and dry to obtain EGMA-g-TiO2, which is a synergistic flame retardant.

[0013] Preferably, in the above technical solution, in step (1), the mass ratio of ammonia water, titanium dioxide, KH570, anhydrous ethanol and deionized water is (36-40): (22-24): (10-16): (50-60): (60-80).

[0014] Preferably, in the above technical solution, in step (2), the mass ratio of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol, and deionized water is (30-40): (16-20): (18-20): (60-70): (80-100).

[0015] Preferably, in the above technical solution, the antioxidant is one or a mixture of 2,2'-thiobis[ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-p-cresol and 4,6-bis(octylthiomethyl)-o-cresol.

[0016] Preferably, in the above technical solution, the thermoplastic plastic is one of polyethylene (PE), polypropylene (PP), polystyrene (PS), polybutylene terephthalate (PBT) or polyamide 6 (PA6).

[0017] A method for preparing a flame retardant thermoplastic composite material comprises the following steps:

[0018] (1) mixing a thermoplastic plastic, a flame retardant, a synergistic flame retardant, and an antioxidant in proportion and stirring uniformly to obtain a mixture;

[0019] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a thermoplastic composite material.

[0020] A method for preparing a synergistic flame retardant EGMA-g-TiO2 comprises the following steps:

[0021] (1) Weigh a certain amount of ammonia water, titanium dioxide, KH570, anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 30-60°C for 6-8 hours, filter, wash, and dry to obtain amino titanium dioxide;

[0022] (2) Weigh a certain amount of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 50-60°C for 7-8 hours, filter, wash, and dry to obtain EGMA-g-TiO2, which is a synergistic flame retardant;

[0023] Among them, the mass ratio of ammonia water, titanium dioxide, KH570, anhydrous ethanol and deionized water is (36-40): (22-24): (10-16): (50-60): (60-80); the mass ratio of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol and deionized water is (30-40): (16-20): (18-20): (60-70): (80-100).

[0024] Application of synergistic flame retardant EGMA-g-TiO2 in the preparation of flame retardant thermoplastics.

[0025] Preferably, in the above technical solution, the synergistic flame retardant EGMA-g-TiO2 is used to improve the interface compatibility between WR02 and thermoplastic materials, and form a titanium-containing protective layer at the interface to enhance the flame retardant performance.

[0026] The above technical solution of the present invention has the following beneficial effects:

[0027] (1) The EGMA-g-TiO2 synthesized in this patent has two functions: 1) EGMA-g-TiO2 can act as an interface compatibilizer between thermoplastics and flame retardant WR02, improving the dispersion of flame retardant WR02 in thermoplastics, thereby improving their flame retardant properties; 2) EGMA-g-TiO2 can form a continuous and dense titanium-containing protective layer on the interface, better isolating heat and oxygen, thereby preventing the decomposition of flammable thermoplastics, and playing a better synergistic flame retardant role with WR02.

[0028] (2) The present invention synthesizes a synergistic flame retardant EGMA-g-TiO2. Compared with titanium dioxide, it can better enhance the flame retardancy of thermoplastics together with the nitrogen-phosphorus flame retardant WR02, and has very important promotion value. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0030] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods. The materials and reagents used are all commercially available unless otherwise specified. The equipment used in the experiments are all well known to those skilled in the art unless otherwise specified.

[0031] The raw materials used in the embodiments of the present invention are as follows:

[0032] PBT (model 2002U), Polyplastics, Japan; PP (model Z30S), Maoming Petrochemical; PE (model 5070), Panjin Ethylene; PA6 (model CM1017), Toray, Japan; PS (model 350), Guoqiao; titanium dioxide, Langfang Lanke Chemical Co., Ltd.; deionized water, Jinan Qingtian Chemical Technology Co., Ltd.; ammonia, Jinan Mengqiao Chemical Co., Ltd.; anhydrous ethanol, Jinan Century Tongda Chemical Co., Ltd.; N,N-dimethylformamide, Shanghai Denuo Chemical Co., Ltd.; ethylene methyl acrylate-glycidyl methacrylate (EGMA), Guangzhou Hangqin Chemical Co., Ltd.; WR02, Suzhou Anhongtai New Materials Co., Ltd.; 2,6-di-tert-butyl-p-cresol, Jiangsu Jufeng Chemical Technology Co., Ltd.; 2,6-di-tert-butyl-p-cresol, Nanjing Milan Chemical Co., Ltd.; 4,6-bis(octylthiomethyl)-o-cresol), Shandong Xufuyuan Chemical Co., Ltd.; KH570, Jinan Haowen Chemical Co., Ltd.

[0033] The testing instrument used in the present invention is as follows:

[0034] ZSK30 twin-screw extruder, W&P, Germany; JL-1000 tensile testing machine, Guangzhou Guangcai Experimental Instrument Co., Ltd.; HTL900-T-5B injection molding machine, Haitai Plastic Machinery Co., Ltd.; XCJ-500 impact testing machine, Chengde Testing Machine Factory; QT-1196 tensile tester, Dongguan Gaotai Testing Instrument Co., Ltd.; QD-GJS-B12K high-speed mixer, Beijing Hengaode Instrument Co., Ltd.

[0035] Example 1

[0036] Preparation Example 1

[0037] (1) Weigh 360 g of ammonia water, 220 g of titanium dioxide, 100 g of KH570, 500 g of anhydrous ethanol, and 600 g of deionized water, add them to a reaction vessel, react in a water bath at 30°C for 6 h, filter, wash, and dry to obtain amino titanium dioxide.

[0038] (2) Weigh 300 g of amino titanium dioxide, 160 g of N,N-dimethylformamide, 180 g of ethylene-methyl acrylate-glycidyl methacrylate (EGMA), 600 g of anhydrous ethanol, and 800 g of deionized water, add them to a reaction vessel, react in a 50°C water bath for 7 h, filter, wash, and dry to obtain EGMA-g-TiO2, which is the synergistic flame retardant M1.

[0039] Application Example 1

[0040] (1) Weigh 90 parts of PP, 15 parts of WR02, 3 parts of synergistic flame retardant M1, and 0.1 parts of 2,6-di-tert-butyl-p-cresol, mix and stir to obtain a mixture;

[0041] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PP composite material X1.

[0042] Among them, the twin-screw extruder includes six temperature zones arranged in sequence, the temperature of the first temperature zone is 170°C, the temperature of the second temperature zone is 220°C, the temperature of the third temperature zone is 230°C, the temperature of the fourth temperature zone is 240°C, the temperature of the fifth temperature zone is 240°C, and the temperature of the sixth temperature zone is 240°C. The head temperature of the twin-screw extruder is 230°C and the screw speed is 220r / min.

[0043] Comparative Example 1

[0044] (1) Weigh 90 parts of PP, 15 parts of WR02, 3 parts of titanium dioxide, and 0.1 parts of 2,6-di-tert-butyl-p-cresol, mix and stir to obtain a mixture;

[0045] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PP composite material P1.

[0046] Among them, the twin-screw extruder includes six temperature zones arranged in sequence, the temperature of the first temperature zone is 170°C, the temperature of the second temperature zone is 220°C, the temperature of the third temperature zone is 230°C, the temperature of the fourth temperature zone is 240°C, the temperature of the fifth temperature zone is 240°C, and the temperature of the sixth temperature zone is 240°C. The head temperature of the twin-screw extruder is 230°C and the screw speed is 220r / min.

[0047] The performance data of the PP composite materials prepared in the above Application Example 1 and Comparative Example 1 are shown in the following table:

[0048]

[0049] It can be seen from the above table that the flame retardant performance of X1 is better than that of D1, which means that the flame retardant performance of PP is better after adding the synergistic flame retardant M1 of the present invention.

[0050] Example 2

[0051] Preparation Example 2

[0052] (1) Weigh 400 g of ammonia water, 240 g of titanium dioxide, 160 g of KH570, 600 g of anhydrous ethanol, and 800 g of deionized water, add them to a reaction vessel, react in a water bath at 60°C for 8 h, filter, wash, and dry to obtain amino titanium dioxide.

[0053] (2) Weigh 400 g of amino titanium dioxide, 200 g of N,N-dimethylformamide, 200 g of ethylene-methyl acrylate-glycidyl methacrylate (EGMA), 700 g of anhydrous ethanol, and 1.0 kg of deionized water, add them to a reaction vessel, react in a water bath at 60°C for 8 h, filter, wash, and dry to obtain EGMA-g-TiO2, which is the synergistic flame retardant M2.

[0054] Application Example 2

[0055] (1) Weigh 100 parts of PBT, 17 parts of WR02, 5 parts of synergistic flame retardant M2, 0.1 parts of antioxidant 2,6-di-tert-butyl-p-cresol, 0.2 parts of antioxidant β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, and 0.2 parts of antioxidant 4,6-bis(octylthiomethyl)-o-cresol, mix and stir evenly to obtain a mixture;

[0056] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PBT composite material X2.

[0057] Among them, the twin-screw extruder includes six temperature zones arranged in sequence, the temperature of the first temperature zone is 200°C, the temperature of the second temperature zone is 260°C, the temperature of the third temperature zone is 260°C, the temperature of the fourth temperature zone is 260°C, the temperature of the fifth temperature zone is 260°C, and the temperature of the sixth temperature zone is 260°C. The head temperature of the twin-screw extruder is 260°C and the screw speed is 300r / min.

[0058] Comparative Example 2

[0059] (1) Weigh 100 parts of PBT, 17 parts of WR02, 5 parts of titanium dioxide, 0.1 parts of antioxidant 2,6-di-tert-butyl-p-cresol, 0.2 parts of antioxidant β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, and 0.2 parts of antioxidant 4,6-bis(octylthiomethyl)-o-cresol, mix and stir evenly to obtain a mixture;

[0060] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PBT composite material D2.

[0061] Among them, the twin-screw extruder includes six temperature zones arranged in sequence, the temperature of the first temperature zone is 200°C, the temperature of the second temperature zone is 260°C, the temperature of the third temperature zone is 260°C, the temperature of the fourth temperature zone is 260°C, the temperature of the fifth temperature zone is 260°C, and the temperature of the sixth temperature zone is 260°C. The head temperature of the twin-screw extruder is 260°C and the screw speed is 300r / min.

[0062] The performance data of the PBT composite materials prepared in the above Application Example 2 and Comparative Example 2 are shown in the following table:

[0063]

[0064] It can be seen from the above table that the flame retardant performance of X2 is better than that of D2, which means that after adding the synergistic flame retardant M2 of the present invention, the flame retardant performance of PBT is better.

[0065] Example 3

[0066] Preparation Example 3

[0067] (1) Weigh 380 g of ammonia water, 230 g of titanium dioxide, 130 g of KH570, 550 g of anhydrous ethanol, and 700 g of deionized water, add them to a reaction vessel, react in a 45°C water bath for 7 h, filter, wash, and dry to obtain amino titanium dioxide.

[0068] (2) Weigh 350 g of amino titanium dioxide, 180 g of N,N-dimethylformamide, 190 g of ethylene-methyl acrylate-glycidyl methacrylate (EGMA), 650 g of anhydrous ethanol, and 900 g of deionized water, add them to a reaction vessel, react in a 55°C water bath for 7.5 h, filter, wash, and dry to obtain EGMA-g-TiO2, which is the synergistic flame retardant M3.

[0069] Application Example 3

[0070] (1) Weigh 95 parts of PE, 16 parts of WR02, 4 parts of synergistic flame retardant M3, 0.1 parts of antioxidant β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, and 0.2 parts of antioxidant 2,6-di-tert-butyl-p-cresol, mix and stir to obtain a mixture;

[0071] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PE composite material X3.

[0072] Among them, the twin-screw extruder includes six temperature zones arranged in sequence, the temperature of the first temperature zone is 120°C, the temperature of the second temperature zone is 180°C, the temperature of the third temperature zone is 180°C, the temperature of the fourth temperature zone is 180°C, the temperature of the fifth temperature zone is 180°C, and the temperature of the sixth temperature zone is 180°C. The head temperature of the twin-screw extruder is 180°C and the screw speed is 300r / min.

[0073] Comparative Example 3

[0074] (1) Weigh 95 parts of PE, 16 parts of WR02, 4 parts of titanium dioxide, 0.1 parts of antioxidant β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, and 0.2 parts of antioxidant 2,6-di-tert-butyl-p-cresol, mix and stir to obtain a mixture;

[0075] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PE composite material X3.

[0076] The performance data of the PE composite materials prepared in the above Application Example 3 and Comparative Example 3 are shown in the following table:

[0077]

[0078] It can be seen from the above table that the flame retardant performance of X3 is better than that of D3, which means that after adding the synergistic flame retardant M3 of the present invention, the flame retardant performance of PE is better.

[0079] Example 4

[0080] Preparation Example 4

[0081] (1) Weigh 385 g of ammonia water, 235 g of titanium dioxide, 155 g of KH570, 545 g of anhydrous ethanol, and 775 g of deionized water, add them to a reaction vessel, react in a water bath at 58°C for 7.5 h, filter, wash, and dry to obtain amino titanium dioxide.

[0082] (2) Weigh 315 g of amino titanium dioxide, 195 g of N,N-dimethylformamide, 185 g of ethylene-methyl acrylate-glycidyl methacrylate (EGMA), 675 g of anhydrous ethanol, and 925 g of deionized water, add them to a reaction vessel, react in a water bath at 58°C for 7.4 h, filter, wash, and dry to obtain EGMA-g-TiO2, which is the synergistic flame retardant M4.

[0083] Application Example 4

[0084] (1) Weigh 98.5 parts of PA6, 16.6 parts of octabromobisphenol S ether, 4.8 parts of synergistic flame retardant M4, 0.1 parts of antioxidant 2,6-di-tert-butyl-p-cresol, and 0.2 parts of antioxidant 4,6-bis(octylthiomethyl)-o-cresol, mix and stir to obtain a mixture;

[0085] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PA6 composite material X4.

[0086] Among them, the twin-screw extruder includes six temperature zones arranged in sequence, the temperature of the first temperature zone is 230°C, the temperature of the second temperature zone is 260°C, the temperature of the third temperature zone is 260°C, the temperature of the fourth temperature zone is 260°C, the temperature of the fifth temperature zone is 260°C, and the temperature of the sixth temperature zone is 260°C. The head temperature of the twin-screw extruder is 250°C and the screw speed is 320r / min.

[0087] Comparative Example 4

[0088] (1) Weigh 98.5 parts of PA6, 16.6 parts of octabromobisphenol S ether, 4.8 parts of synergistic flame retardant M4, 0.1 parts of antioxidant 2,6-di-tert-butyl-p-cresol, and 0.2 parts of antioxidant 4,6-bis(octylthiomethyl)-o-cresol, mix and stir to obtain a mixture;

[0089] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PA6 composite material D4.

[0090] The performance data of the PA6 composite materials prepared in the above Application Example 4 and Comparative Example 4 are shown in the following table:

[0091]

[0092] It can be seen from the above table that the flame retardant performance of X4 is better than that of D4, which means that the flame retardant performance of PA6 is better after adding the synergistic flame retardant of the present invention.

[0093] Example 5

[0094] Preparation Example 5

[0095] (1) Weigh 389 g of ammonia water, 229 g of titanium dioxide, 145 g of KH570, 525 g of anhydrous ethanol, and 698 g of deionized water, add them to a reaction vessel, react in a water bath at 45°C for 7 h, filter, wash, and dry to obtain amino titanium dioxide.

[0096] (2) Weigh 390 g of amino titanium dioxide, 195 g of N,N-dimethylformamide, 185 g of ethylene-methyl acrylate-glycidyl methacrylate (EGMA), 655 g of anhydrous ethanol, and 945 g of deionized water, add them to a reaction vessel, react in a water bath at 58°C for 7.2 h, filter, wash, and dry to obtain EGMA-g-TiO2, which is the synergistic flame retardant X5.

[0097] Application Example 5

[0098] (1) Weigh 99 parts of PS, 15.8 parts of octabromobisphenol S ether, 3.8 parts of synergistic flame retardant M5, 0.1 parts of antioxidant 2,6-di-tert-butyl-p-cresol, and 0.1 parts of antioxidant β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, mix and stir to obtain a mixture;

[0099] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PS composite material X5.

[0100] Among them, the twin-screw extruder includes six temperature zones arranged in sequence, the temperature of the first temperature zone is 160°C, the temperature of the second temperature zone is 200°C, the temperature of the third temperature zone is 200°C, the temperature of the fourth temperature zone is 200°C, the temperature of the fifth temperature zone is 200°C, and the temperature of the sixth temperature zone is 200°C. The head temperature of the twin-screw extruder is 200°C and the screw speed is 280r / min.

[0101] Comparative Example 5

[0102] (1) Weigh 99 parts of PS, 15.8 parts of octabromobisphenol S ether, 3.8 parts of titanium dioxide, 0.1 parts of antioxidant 2,6-di-tert-butyl-p-cresol, and 0.1 parts of antioxidant β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, mix and stir to obtain a mixture;

[0103] (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a PS composite material X5.

[0104] The performance data of the PS composite materials prepared in the above Application Example 5 and Comparative Example 5 are shown in the following table:

[0105]

[0106] It can be seen from the above table that the flame retardant performance of X5 is better than that of D5, which means that the flame retardant performance of PS is better after adding the synergistic flame retardant M5 of the present invention.

[0107] The present application discloses a method for preparing a synergistic flame retardant, and the thermoplastic plastic material prepared by using the synergistic flame retardant also has a certain degree of improvement in flame retardancy, which is of great significance.

[0108] Although the present invention has been disclosed above by way of embodiments, they are not intended to limit the present invention. Any person skilled in the art may make various choices and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A flame retardant thermoplastic composite material, characterized in that: It comprises the following components in parts by weight: Wherein, the flame retardant is WR02, and the synergistic flame retardant is EGMA-g-TiO2.

2. The flame retardant thermoplastic composite material according to claim 1, characterized in that: The preparation method of the synergistic flame retardant comprises the following steps: (1) Weigh a certain amount of ammonia water, titanium dioxide, KH570, anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 30-60°C for 6-8 hours, filter, wash, and dry to obtain amino titanium dioxide; (2) Weigh a certain amount of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 50-60°C for 7-8 hours, filter, wash, and dry to obtain EGMA-g-TiO2, which is a synergistic flame retardant.

3. The flame retardant thermoplastic composite material according to claim 2, characterized in that: In step (1), the mass ratio of ammonia water, titanium dioxide, KH570, anhydrous ethanol and deionized water is (36-40): (22-24): (10-16): (50-60): (60-80).

4. The flame retardant thermoplastic composite material according to claim 2, characterized in that: In step (2), the mass ratio of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol, and deionized water is (30-40): (16-20): (18-20): (60-70): (80-100).

5. The flame retardant thermoplastic composite material according to claim 1, characterized in that: The antioxidant is one of 2,2'-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)ethyl propionate], 2,6-di-tert-butyl-p-cresol and 4,6-bis(octylthiomethyl)-o-cresol or a mixture of several of them.

6. The flame retardant thermoplastic composite material according to claim 1, characterized in that: The thermoplastic plastic is one of polyethylene (PE), polypropylene (PP), polystyrene (PS), polybutylene terephthalate (PBT) or polyamide 6 (PA6).

7. The method for preparing a flame retardant thermoplastic composite material according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) mixing a thermoplastic plastic, a flame retardant, a synergistic flame retardant, and an antioxidant in proportion and stirring uniformly to obtain a mixture; (2) The mixed material obtained in step (1) is extruded from an extruder and granulated to obtain a thermoplastic composite material.

8. A method for preparing a synergistic flame retardant EGMA-g-TiO2, characterized in that: The following steps are involved: (1) Weigh a certain amount of ammonia water, titanium dioxide, KH570, anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 30-60°C for 6-8 hours, filter, wash, and dry to obtain amino titanium dioxide; (2) Weigh a certain amount of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol, and deionized water, add them to a reaction vessel, react in a water bath at 50-60°C for 7-8 hours, filter, wash, and dry to obtain EGMA-g-TiO2, which is a synergistic flame retardant; Among them, the mass ratio of ammonia water, titanium dioxide, KH570, anhydrous ethanol and deionized water is (36-40): (22-24): (10-16): (50-60): (60-80); the mass ratio of amino titanium dioxide, N,N-dimethylformamide, ethylene-methyl acrylate-glycidyl methacrylate (EGMA), anhydrous ethanol and deionized water is (30-40): (16-20): (18-20): (60-70): (80-100).

9. Use of a synergistic flame retardant EGMA-g-TiO2 in the preparation of flame-retardant thermoplastics, characterized in that: The synergistic flame retardant EGMA-g-TiO2 is prepared according to the preparation method according to claim 8.

10. The use according to claim 9, characterized in that The synergistic flame retardant EGMA-g-TiO2 is used to improve the interfacial compatibility between WR02 and thermoplastic materials, and to form a titanium-containing protective layer at the interface to enhance flame retardancy.

Images