Chlorinated paraffin-montmorillonite compounded efficient flame retardant and use thereof

Abstract

Disclosed in the present invention are a chlorinated paraffin-montmorillonite compounded efficient flame retardant and the use thereof. The chlorinated paraffin-montmorillonite compounded efficient flame retardant is obtained by subjecting montmorillonite to an intercalation modification reaction using a chlorinated-paraffin-based quaternary ammonium salt. According to the chlorinated paraffin-montmorillonite compounded efficient flame retardant and the use thereof provided by the present invention, by compounding chlorinated paraffin and montmorillonite for use as the efficient flame retardant for flame-retardant modification of a plastic product, chlorinated paraffin, a halogen flame retardant, and montmorillonite, an inorganic flame retardant, can achieve a synergistic effect, making it possible to achieve high flame retardance and high mechanical properties of a high-molecular plastic product on the premise of a low addition amount.

Description

A high-efficiency flame retardant of chlorinated paraffin composite montmorillonite and its application Technical Field

[0001] The present invention relates to the technical field of flame retardant materials, in particular to a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite and application thereof. Background Art

[0002] The use and application of plastic polymers is rapidly increasing, and the applications of plastic products in daily life are becoming increasingly diverse. However, once a fire occurs in plastic products, which are polymer materials, the consequences are extremely serious. The combustion process produces large amounts of toxic and harmful gases, posing an extremely significant threat to humans and the surrounding environment. This places correspondingly high demands on the flame retardant properties of plastic products. Research on flame retardancy in plastic products is now extensive and in-depth. Strict flame retardant standards and environmental regulations are gradually being implemented and applied to all aspects of modern life. High-efficiency, low-smoke, low-toxic, and environmentally friendly flame retardants have become the development trend of flame retardants.

[0003] Currently, flame retardant modification of plastic products primarily involves adding flame retardants. However, most additive flame retardants have negative, sometimes severe, effects on the mechanical and processing properties of plastic products. Therefore, resolving the conflict between high flame retardancy and mechanical properties has become a challenge in developing high-quality flame-retardant plastic products.

[0004] Chlorine-based flame retardants are commonly used flame retardant additives for plastic products, and their flame retardant effect is mainly achieved through the gas-phase flame retardant mechanism. Not only can they inhibit the combustion chain reaction, but their pyrolysis products can also act as inert substances to dilute the concentration of combustible gases. As halogen-containing compounds, the flame retardant mode of chlorine-based flame retardants is to release halogen and hydrogen halide at high temperatures, among which hydrogen halide can capture highly active free radicals H·, O· and OH·, while generating halogen free radicals with lower energy, and ultimately terminate the chain combustion reaction. However, due to the insufficient flame retardant efficiency or heat resistance of chlorine-based flame retardants (such as chlorinated paraffin), they cannot be widely used in flame-retardant plastic products.

[0005] Montmorillonite is a layered, chain-like inorganic nanomaterial. Existing technologies have effectively combined it with plastic polymers to form composite plastic products with excellent mechanical, flame-retardant, and other properties. The superior performance of these composite plastic products compared to traditional composite plastic products stems from the strong interaction between the polymer matrix and the organic montmorillonite. On the one hand, since the polymer's macromolecular chains are confined within the montmorillonite's interlayer, their movement is hindered. Furthermore, the organic montmorillonite has a small particle size, a large surface area, and numerous surface active centers, allowing it to tightly bond with the polymer matrix and exhibit good compatibility, resulting in excellent mechanical properties. On the other hand, since montmorillonite itself is non-flammable, when the polymer's macromolecular chains are confined within the interlayer of the montmorillonite, their movement is restricted, hindering the formation of volatile gases during combustion.

[0006] However, the premise for using montmorillonite to form composite plastic products with excellent mechanical, flame retardant and other properties is that the montmorillonite can be effectively dispersed when added to the polymer matrix. At present, if the montmorillonite is not modified, there will be a problem of poor dispersion when the montmorillonite is added to the polymer matrix. At this time, only a small amount of montmorillonite can be added to the matrix to avoid the agglomeration of the montmorillonite and affect the physical and mechanical properties of the composite material. However, it is difficult to achieve the ideal modification effect with a small amount of montmorillonite.

[0007] Summary of the Invention

[0008] Based on the technical problems existing in the background technology, the present invention proposes a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite and its application. Chlorinated paraffin composite montmorillonite is used as a high-efficiency flame retardant to perform flame retardant modification on plastic products, so that the halogen flame retardant chlorinated paraffin and the inorganic flame retardant montmorillonite can play a synergistic role, and high flame retardancy and high mechanical properties of polymer plastic products can be achieved under the premise of low addition amount.

[0009] The invention provides a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite, which is obtained by subjecting montmorillonite to an intercalation modification reaction with a chlorinated paraffin-based quaternary ammonium salt.

[0010] In the present invention, montmorillonite is intercalated and modified with a chlorinated paraffin-based quaternary ammonium salt. On the one hand, the chlorinated paraffin-based quaternary ammonium salt increases the interlayer spacing of the inorganic montmorillonite, improves its expansion performance, and introduces organic components between its layers, thereby improving the interface polarity and chemical microenvironment of the inorganic matter, and ultimately improving the dispersibility of the montmorillonite and the chlorinated paraffin intercalated therein in the polymer matrix. This not only reduces the mobility of small molecules of flame retardants such as chlorinated paraffin, allowing the montmorillonite and chlorinated paraffin to better exert their synergistic effect, but also facilitates the effective dispersion of the montmorillonite in the polymer matrix, thereby obtaining excellent mechanical improvement properties. On the other hand, the pore structure of the montmorillonite in the obtained high-efficiency flame retardant can absorb a large amount of combustible gas, delay the escape of volatile products generated during the thermal decomposition of the polymer material, and help to exert the flame retardant effect. In addition, the heat insulation effect of the montmorillonite itself can avoid the defect of easy melting and dripping when the chlorinated paraffin is simply added to the polymer, objectively overcoming the defect of insufficient heat resistance.

[0011] Preferably, the chlorinated paraffin-based quaternary ammonium salt is obtained by subjecting chlorinated paraffin to a nucleophilic substitution reaction with a tertiary amine compound.

[0012] Preferably, the tertiary amine compound is a tertiary amine compound containing alkoxysilane;

[0013] Preferably, the tertiary amine compound containing alkoxysilane is obtained by a ring-opening reaction of a silane coupling agent containing an epoxy group with N,N-dimethylethanolamine;

[0014] Preferably, the epoxy group-containing silane coupling agent is at least one of γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane or β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, preferably γ-glycidyloxypropyltrimethoxysilane.

[0015] In the present invention, when the silane coupling agent containing an epoxy group is γ-glycidyloxypropyltrimethoxysilane, the structure of the tertiary amine compound containing an alkoxysilane is as follows:

[0016] In the present invention, chlorinated paraffin is subjected to a nucleophilic substitution reaction with a tertiary amine compound containing an alkoxysilane. The structure of the obtained chlorinated paraffin-based quaternary amine contains an alkoxysilane group. In addition to being able to perform intercalation modification on montmorillonite, the alkoxysilane can also condense with the hydroxyl groups on the montmorillonite. This does not further increase the surface lipophilicity of the montmorillonite, but is beneficial for dispersing the montmorillonite in the polymer matrix. It also improves the anchoring property of the chlorinated paraffin in the montmorillonite, avoids migration, and thus effectively exerts a flame retardant effect.

[0017] Preferably, the mass ratio of the chlorinated paraffin to the tertiary amine compound is 1:1-3;

[0018] Preferably, the temperature of the nucleophilic substitution reaction is 70-90° C., and the time is 1-3 h.

[0019] Preferably, the montmorillonite is at least one of sodium-based montmorillonite, calcium-based montmorillonite and magnesium-based montmorillonite.

[0020] Preferably, the mass ratio of the chlorinated paraffin-based quaternary ammonium salt to montmorillonite is 1:3-5.

[0021] Preferably, the temperature of the intercalation modification reaction is 80-100° C. and the time is 4-8 hours.

[0022] The present invention also provides a method for preparing the above-mentioned chlorinated paraffin composite montmorillonite high-efficiency flame retardant, comprising:

[0023] (1) After mixing chlorinated paraffin and a tertiary amine compound, heating to 70-90° C. and stirring for 1-3 hours to obtain a chlorinated paraffin-based quaternary ammonium salt;

[0024] (2) After montmorillonite is evenly dispersed with a dispersion medium, the chlorinated paraffin-based quaternary ammonium salt is added and mixed evenly, the mixture is heated to 80-100° C. and stirred for reaction for 4-8 hours, filtered, washed, and dried to obtain the high-efficiency flame retardant of the chlorinated paraffin-composite montmorillonite.

[0025] Preferably, the dispersion medium is at least one of water, ethanol or methanol, and the content of the montmorillonite after being uniformly dispersed in the dispersion medium is 1-5 wt%.

[0026] The present invention also proposes the use of the chlorinated paraffin composite montmorillonite high-efficiency flame retardant in flame-retardant plastics.

[0027] Preferably, the flame retardant plastic comprises a polymer matrix and the high-efficiency flame retardant;

[0028] Preferably, the polymer matrix is ​​at least one of PE, PP, PA, PC, PBT or ABS;

[0029] Preferably, the amount of the high-efficiency flame retardant is 1-20 wt% of the polymer matrix.

[0030] In the present invention, the high-efficiency flame retardant of the chlorinated paraffin composite montmorillonite is modified by intercalation of the montmorillonite using a chlorinated paraffin-based quaternary ammonium salt, thereby introducing organic components between the layers and improving its lipophilicity. As the lipophilicity of the montmorillonite increases, the interaction between the montmorillonite and the polymer matrix increases, resulting in increased viscosity of the system, decreased fluidity of the polymer matrix, and difficulty in dripping. In addition, when heated, the chlorinated paraffin generates unstable free Cl structures, which capture H free radicals in the polymer matrix. Although the generated HCl gas can have a flame retardant effect, the HCl gas is corrosive to the environment. Considering that the intercalated structure of the montmorillonite can effectively adsorb the HCl gas and prevent it from diffusing into the environment, the high-efficiency flame retardant of the present invention is also beneficial to the environment. Furthermore, when the polymer material is subjected to strong heating, the montmorillonite can form multiple layers of black flocculent carbon-containing aluminum silicate residues on the polymer surface, which migrate to the material surface to form a protective layer, thereby improving the thermal stability of the polymer and helping the chlorinated paraffin to exert its flame retardant effect in plastic products.

[0031] In the present invention, compared with simply physically blending chlorinated paraffin and montmorillonite as a flame retardant, montmorillonite is intercalated and modified with a chlorinated paraffin-based quaternary ammonium salt to serve as a flame retardant. The latter can significantly reduce the amount of flame retardant without reducing the flame retardancy level. It can be seen that chlorinated paraffin and montmorillonite have a certain synergistic flame retardant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is an infrared spectrum of montmorillonite before and after modification by the chlorinated paraffin-based quaternary ammonium salt intercalation described in Example 1;

[0033] FIG2 is a thermogravimetric analysis diagram of the flame retardants of Example 1 and Comparative Examples 1 and 2. DETAILED DESCRIPTION

[0034] Hereinafter, the technical solutions of the present invention will be described in detail through specific embodiments. However, it should be clearly stated that these embodiments are provided for illustration only and are not to be construed as limiting the scope of the present invention.

[0035] Example 1

[0036] This embodiment provides a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite, which is prepared by the following method:

[0037] (1) N, N-dimethylethanolamine mixed with tin tetrachloride (catalyst) was added dropwise to γ-glycidyloxypropyltrimethoxysilane, with the mass ratio of tin tetrachloride, N, N-dimethylethanolamine, and γ-glycidyloxypropyltrimethoxysilane being 0.01:1:2.8. After the addition was completed, the mixture was heated to 60°C and stirred for a ring-opening reaction for 3 hours to obtain a tertiary amine compound containing alkoxysilane;

[0038] (2) mixing chlorinated paraffin and the above-mentioned alkoxysilane-containing tertiary amine compound in a mass ratio of 1:2, heating to 80° C. and stirring for 2 h to obtain a chlorinated paraffin-based quaternary ammonium salt;

[0039] (3) Sodium-based nano-montmorillonite (particle size of 60 nm) is dispersed in water and stirred to disperse evenly to obtain a nano-montmorillonite dispersion with a concentration of 3 wt%. The above-mentioned chlorinated paraffin-based quaternary ammonium salt is added to the nano-montmorillonite dispersion, and the mass ratio of the chlorinated paraffin-based quaternary ammonium salt to the sodium-based nano-montmorillonite is 1:4. After stirring and mixing evenly, the mixture is heated to 90°C and stirred for 6 hours, filtered, washed with water, and the filter cake is dried to obtain the high-efficiency flame retardant of the chlorinated paraffin composite montmorillonite.

[0040] This embodiment also provides a flame-retardant plastic, which is obtained by adding the above-mentioned high-efficiency flame retardant of chlorinated paraffin composite montmorillonite and polypropylene into a high-speed mixer and blending them evenly, wherein the amount of the high-efficiency flame retardant of chlorinated paraffin composite montmorillonite is 5wt% of the polypropylene. The resulting blended material is then added to a twin-screw extruder, extruded and granulated in the temperature range of 165-195°C, and melt injection molded at 250°C to obtain the flame-retardant plastic.

[0041] The montmorillonite before and after the modification by the chlorinated paraffin-based quaternary ammonium salt intercalation described in Example 1 was subjected to infrared absorption spectrum test. The results were shown in FIG1 . FIG1 is an infrared spectrum of the montmorillonite before and after the modification by the chlorinated paraffin-based quaternary ammonium salt intercalation described in Example 1. As shown in FIG1 , the montmorillonite after the modification by the chlorinated paraffin-based quaternary ammonium salt intercalation described in Example 1 has an infrared absorption spectrum of 763 cm -1 The absorption peak at 1288 cm -1 The absorption peak at 1732 cm is the stretching vibration peak of -COC-. -1 and 2018cm -1 The absorption peak at is C-C1 characteristic absorption peak.

[0042] Example 2

[0043] This embodiment provides a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite, which is prepared by the following method:

[0044] (1) N, N-dimethylethanolamine mixed with tin tetrachloride (catalyst) was added dropwise to γ-glycidyloxypropyltriethoxysilane, with the mass ratio of tin tetrachloride, N, N-dimethylethanolamine, and γ-glycidyloxypropyltriethoxysilane being 0.01:1:3. After the addition was completed, the mixture was heated to 60°C and stirred for a ring-opening reaction for 3 hours to obtain a tertiary amine compound containing alkoxysilane;

[0045] (2) mixing chlorinated paraffin and the above-mentioned alkoxysilane-containing tertiary amine compound in a mass ratio of 1:3, heating to 70° C. and stirring for 3 hours to obtain a chlorinated paraffin-based quaternary ammonium salt;

[0046] (3) Sodium-based nano-montmorillonite (particle size of 60 nm) is dispersed in water and stirred to disperse evenly to obtain a nano-montmorillonite dispersion with a concentration of 1 wt%, and the above-mentioned chlorinated paraffin-based quaternary ammonium salt is added to the nano-montmorillonite dispersion, with the mass ratio of the chlorinated paraffin-based quaternary ammonium salt to the sodium-based nano-montmorillonite being 1:5. After stirring and mixing evenly, the mixture is heated to 80°C and stirred for reaction for 8 hours, filtered, washed with water, and the filter cake is dried to obtain the high-efficiency flame retardant of the chlorinated paraffin-composite montmorillonite.

[0047] This embodiment also provides a flame-retardant plastic, which is obtained by adding the above-mentioned high-efficiency flame retardant of chlorinated paraffin composite montmorillonite and polypropylene into a high-speed mixer and blending them evenly, wherein the amount of the high-efficiency flame retardant of chlorinated paraffin composite montmorillonite is 5wt% of the polypropylene. The resulting blended material is then added to a twin-screw extruder, extruded and granulated in the temperature range of 165-195°C, and melt injection molded at 250°C to obtain the flame-retardant plastic.

[0048] Example 3

[0049] This embodiment provides a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite, which is prepared by the following method:

[0050] (1) N, N-dimethylethanolamine mixed with tin tetrachloride (catalyst) was added dropwise to β-(3, 4-epoxycyclohexyl) ethyltrimethoxysilane, with the mass ratio of tin tetrachloride, N, N-dimethylethanolamine, and β-(3, 4-epoxycyclohexyl) ethyltrimethoxysilane being 0.01:1:3. After the addition was complete, the mixture was heated to 60°C and stirred for a ring-opening reaction for 3 hours to obtain a tertiary amine compound containing an alkoxysilane;

[0051] (2) mixing chlorinated paraffin and the above-mentioned alkoxysilane-containing tertiary amine compound in a mass ratio of 1:1, heating to 90° C. and stirring for 1 hour to obtain a chlorinated paraffin-based quaternary ammonium salt;

[0052] (3) Sodium-based nano-montmorillonite (particle size of 60 nm) is dispersed in water and stirred to disperse evenly to obtain a nano-montmorillonite dispersion with a concentration of 5 wt%. The above-mentioned chlorinated paraffin-based quaternary ammonium salt is added to the nano-montmorillonite dispersion, and the mass ratio of the chlorinated paraffin-based quaternary ammonium salt to the sodium-based nano-montmorillonite is 1:3. After stirring and mixing evenly, the mixture is heated to 100°C and stirred for reaction for 4 hours. The mixture is filtered, washed with water, and the filter cake is dried to obtain the high-efficiency flame retardant of the chlorinated paraffin-composite montmorillonite.

[0053] This embodiment also provides a flame-retardant plastic, which is obtained by adding the above-mentioned high-efficiency flame retardant of chlorinated paraffin composite montmorillonite and polypropylene into a high-speed mixer and blending them evenly, wherein the amount of the high-efficiency flame retardant of chlorinated paraffin composite montmorillonite is 5wt% of the polypropylene. The resulting blended material is then added to a twin-screw extruder, extruded and granulated in the temperature range of 165-195°C, and melt injection molded at 250°C to obtain the flame-retardant plastic.

[0054] Comparative Example 1

[0055] This comparative example proposes a flame retardant, which is prepared by the following method:

[0056] Sodium-based nano-montmorillonite (particle size of 60 nm) is dispersed in water and stirred to be uniformly dispersed to obtain a nano-montmorillonite dispersion with a concentration of 3 wt%. Chlorinated paraffin is added to the nano-montmorillonite dispersion with a mass ratio of chlorinated paraffin to sodium-based nano-montmorillonite of 1:4. After stirring and mixing evenly, the mixture is heated to 90° C. and stirred for reaction for 6 hours. The mixture is filtered, washed with water, and the filter cake is dried to obtain the flame retardant.

[0057] This comparative example also proposes a flame-retardant plastic, which is obtained by adding the above-mentioned flame retardant and polypropylene into a high-speed mixer and blending them evenly, wherein the amount of the flame retardant is 5wt% of the polypropylene, and then adding the obtained blended material into a twin-screw extruder, extruding and granulating in the temperature range of 165-195°C, and melt injection molding at 250°C to obtain the flame-retardant plastic.

[0058] Comparative Example 2

[0059] This comparative example proposes a flame retardant, which is prepared by the following method:

[0060] (1) After mixing chlorinated paraffin and N, N-dimethylethanolamine in a mass ratio of 1:2, heating to 80°C and stirring for 2 hours to obtain a chlorinated paraffin-based quaternary ammonium salt;

[0061] (2) Sodium-based nano-montmorillonite (particle size of 60 nm) was dispersed in water and stirred to obtain a nano-montmorillonite dispersion with a concentration of 3 wt%. The above-mentioned chlorinated paraffin-based quaternary ammonium salt was added to the nano-montmorillonite dispersion. The mass ratio of the chlorinated paraffin-based quaternary ammonium salt to the sodium-based nano-montmorillonite was 1:4. After stirring and mixing evenly, the mixture was heated to 90° C. and stirred for 6 h. The mixture was filtered, washed with water, and the filter cake was dried to obtain the flame retardant.

[0062] This comparative example also proposes a flame-retardant plastic, which is obtained by adding the above-mentioned high-efficiency flame retardant of chlorinated paraffin composite montmorillonite and polypropylene into a high-speed mixer and blending them evenly, wherein the amount of the high-efficiency flame retardant of chlorinated paraffin composite montmorillonite is 5wt% of the polypropylene. The obtained blended material is then added to a twin-screw extruder, extruded and granulated in the temperature range of 165-195°C, and melt injection molded at 250°C to obtain the flame-retardant plastic.

[0063] The flame retardants described in Example 1 and Comparative Examples 1 and 2 were subjected to TGA testing, and the results are shown in FIG2 , which is a thermogravimetric analysis diagram of the flame retardants described in Example 1 and Comparative Examples 1 and 2. Referring to FIG2 , it can be seen that compared with the flame retardants described in Comparative Examples 1 and 2, it can be clearly seen that the thermal decomposition temperature of the flame retardant described in Example 1 is significantly increased, and the heat resistance is enhanced.

[0064] According to the ASTM D2863-70 standard, the flame retardant plastics described in the examples and comparative examples were subjected to a limiting oxygen index (LOI) test using an oxygen index tester, and the flame retardant plastics described in the examples and comparative examples were subjected to a horizontal vertical combustion (UL-94) test using a horizontal vertical combustion analyzer;

[0065] The mechanical properties of the flame retardant plastics described in the examples and comparative examples were tested with reference to GB / T 1040-2018, GB / T 21189-2007, and GB / T 9341-2008 standards;

[0066] The results are shown in Table 1 below:

[0067] Table 1 Performance test results of the flame retardant plastics described in Examples and Comparative Examples

[0068] As can be seen from Table 1 above, although the simple addition of montmorillonite and chlorinated paraffin has a certain flame retardant effect, the effect is not ideal, and melt dripping occurs; and compared with the ordinary chlorinated paraffin-based quaternary ammonium salt intercalated modified montmorillonite, the chlorinated paraffin-based quaternary ammonium salt intercalated modified montmorillonite of the present invention has a significantly improved interlayer spacing and thermal stability of the montmorillonite, and the flame retardant and mechanical properties are also significantly improved.

[0069] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high-efficiency flame retardant of chlorinated paraffin composite montmorillonite, characterized in that: The invention is obtained by subjecting montmorillonite to an intercalation modification reaction with a quaternary ammonium salt of chlorinated paraffin.

2. The high-efficiency flame retardant of chlorinated paraffin composite montmorillonite according to claim 1, characterized in that: The chlorinated paraffin-based quaternary ammonium salt is obtained by subjecting chlorinated paraffin to a nucleophilic substitution reaction with a tertiary amine compound.

3. The high-efficiency flame retardant of chlorinated paraffin composite montmorillonite according to claim 2, characterized in that: The tertiary amine compound is a tertiary amine compound containing alkoxysilane; Preferably, the tertiary amine compound containing alkoxysilane is obtained by subjecting a silane coupling agent containing an epoxy group to a ring-opening reaction with N,N-dimethylethanolamine; Preferably, the epoxy group-containing silane coupling agent is at least one of γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane or β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, preferably γ-glycidyloxypropyltrimethoxysilane.

4. The high-efficiency flame retardant of chlorinated paraffin composite montmorillonite according to claim 2 or 3, characterized in that: The mass ratio of the chlorinated paraffin to the tertiary amine compound is 1:1-3; Preferably, the temperature of the nucleophilic substitution reaction is 70-90° C. and the time is 1-3 h.

5. The high-efficiency flame retardant of chlorinated paraffin composite montmorillonite according to any one of claims 1 to 4, characterized in that: The montmorillonite is at least one of sodium-based montmorillonite, calcium-based montmorillonite and magnesium-based montmorillonite. Preferably, the mass ratio of the chlorinated paraffin-based quaternary ammonium salt to montmorillonite is 1:3-5.

6. The high-efficiency flame retardant of chlorinated paraffin composite montmorillonite according to any one of claims 1 to 5, characterized in that: The temperature of the intercalation modification reaction is 80-100° C. and the time is 4-8 hours.

7. A method for preparing a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite according to any one of claims 1 to 6, characterized in that: include: (1) After mixing chlorinated paraffin and tertiary amine compounds, heating to 70-90°C and stirring for reaction for 1-3 hours, Obtaining chlorinated paraffin-based quaternary ammonium salt; (2) After montmorillonite is dispersed evenly with a dispersion medium, the chlorinated paraffin-based quaternary ammonium salt is added and mixed evenly, the temperature is raised to 80-100° C. and stirred for reaction for 4-8 hours, filtered, washed, and dried to obtain the chlorinated paraffin-composite montmorillonite high-efficiency flame retardant.

8. The method for preparing a high-efficiency flame retardant of chlorinated paraffin composite montmorillonite according to claim 7, characterized in that: The dispersion medium is at least one of water, ethanol or methanol, and the content of the montmorillonite after being uniformly dispersed in the dispersion medium is 1-5wt%.

9. Use of the high-efficiency flame retardant of the chlorinated paraffin composite montmorillonite according to any one of claims 1 to 6 in flame-retardant plastics.

10. The use of the high-efficiency flame retardant in flame-retardant plastics according to claim 9, characterized in that: The flame retardant plastic comprises a polymer matrix and the high-efficiency flame retardant; Preferably, the polymer matrix is ​​at least one of PE, PP, PA, PC, PBT or ABS; Preferably, the amount of the high-efficiency flame retardant is 1-20 wt % of the polymer matrix.

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