Preparation method of flame-retardant and anti-dripping molecular-level synergist and synergist

Abstract

The preparation method comprises the following steps: uniformly stirring and mixing a phenyl siloxane monomer and an organic solvent in a reactor in advance, dropwise adding an acidic catalyst solution or an alkaline catalyst solution, uniformly stirring, heating, slowly dropwise adding a polytetrafluoroethylene emulsion, and uniformly stirring and mixing; after dropwise adding, adding deionized water into the mixed solution, uniformly stirring, and carrying out hydrolysis dehydration condensation reaction to obtain a filtered product; adding an organic solvent into a filtered product, uniformly stirring, and then adding a sulfonating agent for sulfonating; after the reaction is completed, adding an alkaline substance to neutralize to obtain a product, and filtering, washing and centrifugally drying the product to obtain the flame-retardant anti-dripping molecular-level synergist and filtrate; and distilling the filtrate to recover the organic solvent, and recovering the emulsifier through a drying device. The heat resistance of the material can be improved, the production process is simple, byproducts can be recycled, the whole production process is free of environmental pollution, and the method can be used for large-scale industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of flame retardants, and in particular to a preparation method of a flame retardant and anti-dripping molecular-level synergist and the synergist. Background Art

[0002] With the development of science and technology and the improvement of people's safety awareness, the requirements for flame retardant properties of materials are getting higher and higher. In many emerging application scenarios, such as new energy vehicles, 5G base stations, and smart terminals, plastics are booming. Engineering plastics and their alloy materials play an important role in these fields due to their excellent properties such as good mechanical properties, heat resistance, and electrical insulation properties. The requirements for flame retardant properties are UL94-V0, or even higher 5VA requirements.

[0003] The combustion process of plastic polymers is relatively complicated. In order to effectively prevent combustion and secondary fires caused by dripping, flame retardants and anti-drip agents are often used in practical applications to achieve the synergistic effect of flame retardancy and anti-drip. However, the flame retardant synergist produced by the compounding has the problem of poor dispersibility. At the same time, excessive addition of flame retardants causes a significant decrease in the mechanical properties of the material, while insufficient addition of flame retardants fails to meet the flame retardant grade requirements. Poor dispersibility is due to the fact that the surface energy of flame retardants is generally high. If effective control measures are not taken, flame retardants will agglomerate in a short period of time to reduce the surface energy to reach their own thermodynamically stable state, affecting the flame retardant effect.

[0004] However, it is impossible to achieve good dispersion of flame retardants through processing in the existing technology. For example, the existing anti-drip agents still have the disadvantages of low polytetrafluoroethylene content and poor dispersibility. Products with anti-drip agents have surface defects, such as silver threads, pitting and broken strips on the appearance, and low anti-drip performance. Ordinary physical mixing and compounding cannot achieve a good flame retardant and anti-drip synergistic effect.

[0005] In the flame retardant research of PC resin in engineering plastics, if a compound of sulfonate flame retardant and polytetrafluoroethylene anti-drip agent is used, due to the poor dispersion of flame retardant and anti-drip agent, there are also problems such as flame retardant timeliness and unstable anti-drip performance, resulting in the flame retardant effect not meeting the standard. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a method for preparing a flame retardant and anti-dripping molecular synergist, which can prepare the molecular synergist in an environmentally friendly manner. The synergist plays a flame retardant and anti-dripping synergistic role, improves the dispersion performance of the flame retardant and anti-dripping agent, prolongs the flame retardant time and improves the stability of the anti-dripping performance.

[0007] To achieve the above object, the present invention provides a method for preparing a flame retardant and anti-dripping molecular synergist, comprising the following steps:

[0008] S1: Stir and mix the phenylsiloxane monomer and the organic solvent in a reactor in advance, add the acidic catalyst solution or the alkaline catalyst solution dropwise, stir and mix evenly, and heat to 50°C to 90°C, then slowly add the polytetrafluoroethylene emulsion dropwise, stir and mix evenly, and obtain a mixed solution;

[0009] S2: After the dropwise addition is completed, deionized water is added to the mixed solution and stirred evenly to cause a hydrolysis, dehydration and condensation reaction for 1 h to 2 h. After the reaction is completed, the product is filtered to obtain a filtered product;

[0010] S3: adding an organic solvent to the filtered product and stirring evenly, then adding a sulfonating agent for sulfonation, the reaction temperature is controlled at 100°C to 120°C, the reaction time is controlled at 0.5h to 2h, and the stirring speed is controlled at 30 to 60 rpm;

[0011] S4: after the reaction is completed, an alkaline substance is added to neutralize the product, and the product is filtered, washed, and centrifuged to dry to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0012] S5: After distilling the filtrate to recover the organic solvent, the filtrate is passed through a drying device to recover the emulsifier.

[0013] The polytetrafluoroethylene emulsion is capped under acidic or alkaline conditions by phenylsiloxane monomer, the benzene ring in the filtered product is sulfonated by a sulfonating agent, and finally the phenylsulfonic acid in the sulfonated product is neutralized into salt by an alkaline substance, thereby achieving the monomolecular dispersion of the sulfonate and the nano-scale dispersion of the anti-dripping agent, improving the dispersion performance of the molecular-level synergist, improving the surface gloss of the product, and having high whiteness, fine particle size and good processability.

[0014] As an improvement of the flame retardant and anti-dripping molecular synergist of the present invention, the present invention controls the dropping speed when dropping the polytetrafluoroethylene solution to avoid excessive dropping speed causing excessive reaction, resulting in the end-capped phenylsiloxane being unable to form a complete spherical structure for the polytetrafluoroethylene emulsion droplets, and at the same time, a slightly excessive amount of sulfonating agent can ensure the introduction of sufficient sulfonate structure.

[0015] Preferably, the phenylsiloxane monomer is selected from one or a mixture of phenyltrimethoxysilane, phenyltriethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane and octaphenylcyclotetrasiloxane. The selection of the phenylsiloxane monomer should take into account the reaction rate of the hydrolysis condensation of various siloxanes and the minimum reaction temperature of the activation energy required for the reaction.

[0016] Preferably, the organic solvent in step S1 is selected from one or a mixture of ether, toluene, ethanol, acetone and isopropanol; and the organic solvent in step S3 is selected from one or a mixture of dichloromethane and chloroform. The selection of the organic solvent should take into account the solvent's ability to dissolve the reaction monomers and its volatility at the reaction temperature.

[0017] Preferably, the acidic catalytic solution is selected from one or a mixture of HCl, H2SO4 and HNO3, the alkaline catalyst solution is selected from one or a mixture of NaOH, KOH, ammonia and K2CO3; the sulfonating agent is selected from one or a mixture of concentrated sulfuric acid, oleum and aminosulfonic acid. The selection of the catalyst should be considered comprehensively with factors such as the reaction rate, reaction temperature, and the dissolution of the reaction monomer by the organic solvent to avoid too fast a reaction that cannot achieve single molecule dispersion and too slow a reaction that reduces production efficiency.

[0018] As an improvement of the flame retardant and anti-drip molecular synergist of the present invention, before adding the phenylsiloxane monomer and the organic solvent into the reactor, the reactor must be ensured to be in a dry state. At the same time, when selecting the acidic catalyst solution, the corrosion resistance of the reactor must be considered to prevent the reactor from being corroded by the acidic catalyst solution.

[0019] Preferably, the pH value of the mixed solution is controlled at 1 to 4 under the control of the acidic catalyst solution, and the pH value of the mixed solution is controlled at 9 to 11 under the control of the alkaline catalyst solution. The catalytic principle of the alkaline catalyst solution is that the free hydroxide anions perform nucleophilic substitution on silicon atoms, while the catalytic principle of the acidic catalyst is that hydrogen ions first occupy the empty orbits of oxygen atoms in siloxane, and then the silicon hydroxyl groups perform nucleophilic substitution on them; both the alkaline catalyst solution and the acidic catalyst solution can accelerate the reaction rate, the reaction rate of dripping the alkaline catalyst solution is lower than the reaction rate of dripping the acidic catalyst solution, and the particle size of the siloxane-coated anti-dripping agent generated by the reaction is smaller and more uniform.

[0020] Preferably, the particle size of the polytetrafluoroethylene emulsion is between 90nm and 150nm. Selecting the nanometer-level emulsion particle size can ensure that the particle size of the final product generated by the reaction is effectively controlled; further, the particle size of the polytetrafluoroethylene emulsion is one of 90nm, 100nm, 120nm or 150nm. In practical applications, the particle size of the polytetrafluoroethylene emulsion includes but is not limited to the above specific values.

[0021] Preferably, the weight ratio of the phenylsiloxane monomer to the polytetrafluoroethylene emulsion is 5:1 to 1:5.

[0022] Preferably, the weight ratio of the mixed solution to the deionized water is 1:1 to 1:5; the mass ratio of the filtered product to the sulfonated agent is 1:1 to 1:2. Sufficient deionized water ensures complete hydrolysis of the end-capped phenylsiloxane; as an improvement of the flame retardant and anti-dripping molecular synergist of the present invention, the polytetrafluoroethylene emulsion is slowly added dropwise to the phenylsiloxane monomer in the present invention so that the two substances are combined with each other through hydrolysis-dehydration condensation to form a stable monodisperse condensate.

[0023] Preferably, the alkaline substance is selected from one or a mixture of KOH, NaOH, NaCO3 and K2CO3.

[0024] The second object of the present invention is to provide a flame retardant and anti-dripping molecular synergist obtained by the above preparation method.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The phenylsiloxane monomer and the polytetrafluoroethylene emulsion react in a specific acidic or alkaline environment, the phenylsiloxane monomer is coated on the surface of the polytetrafluoroethylene emulsion, and then the sulfonate is introduced into the system by sulfonating the benzene ring of the phenylsiloxane monomer and salifying the alkaline substance, so as to prepare a flame retardant and anti-dripping molecular synergist;

[0027] 2. The siloxane structure is very beneficial to the processing performance of the material, improving the heat resistance of the material. The production process is simple, the production efficiency is high, the by-products are recyclable, the entire production process is environmentally friendly, and can be used for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the preparation process of the flame retardant and anti-dripping molecular synergist of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0033] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0034] In order to solve the above problems, Figure 1 As shown, the present invention provides a method for preparing a flame retardant and anti-dripping molecular synergist, comprising the following steps:

[0035] S1: Stir and mix the phenylsiloxane monomer and the organic solvent in a reactor in advance, add the acidic catalyst solution or the alkaline catalyst solution dropwise, stir and mix evenly, and heat to 50°C to 90°C, then slowly add the polytetrafluoroethylene emulsion dropwise, stir and mix evenly, and obtain a mixed solution;

[0036] S2: After the dropwise addition is completed, deionized water is added to the mixed solution and stirred evenly to cause a hydrolysis, dehydration and condensation reaction for 1 h to 2 h. After the reaction is completed, the product is filtered to obtain a filtered product;

[0037] S3: adding an organic solvent to the filtered product and stirring evenly, then adding a sulfonating agent for sulfonation, the reaction temperature is controlled at 100°C to 120°C, the reaction time is controlled at 0.5h to 2h, and the stirring speed is controlled at 30 to 60 rpm;

[0038] S4: after the reaction is completed, an alkaline substance is added to neutralize the product, and the product is filtered, washed, and centrifuged to dry to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0039] S5: After distilling the filtrate to recover the organic solvent, the filtrate is passed through a drying device to recover the emulsifier.

[0040] Example 1

[0041] (1) Weigh 120 g to 150 g of ethanol and 60 g to 80 g of phenyltriethoxysilane and mix them evenly in a dry reactor, add ammonia water dropwise to make the pH value of the reaction system = 10, then heat the reactor and control the reaction temperature to 60 ± 2 ° C, and slowly add 50 g to 100 g of polytetrafluoroethylene emulsion dropwise;

[0042] (2) adding 150 g of deionized water and stirring evenly to cause a dehydration condensation reaction for 1 h. After the reaction is complete, the product is filtered to obtain a filtered product;

[0043] (3) Add 150 g to 180 g of chloroform to the filtered product and stir evenly, add 160 g of fuming sulfuric acid as a sulfonating agent, control the reaction temperature at 120° C., the reaction time for 1 h, and the stirring speed at 60 rpm;

[0044] (4) slowly adding NaCO3 and K2CO3, and controlling the weight ratio of the two to be 1:1, adjusting the pH value of the solution to 7, and obtaining the product;

[0045] (5) cooling the product, filtering, washing, and centrifuging and drying to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0046] (6) The filtrate is distilled under reduced pressure to recover ethanol and chloroform, and then the emulsifier powder is recovered by spray drying.

[0047] Example 2

[0048] (1) First, 120 g to 150 g of ethanol, 30 g to 40 g of phenyltriethoxysilane, and 30 g to 40 g of octaphenylcyclotetrasiloxane are weighed and mixed uniformly in a dry reactor in advance, and ammonia water is added dropwise to make the pH value of the reaction system = 10, and then the reactor is heated and the reaction temperature is controlled to 60 ± 2 ° C, and 50 g to 100 g of polytetrafluoroethylene emulsion is slowly added dropwise;

[0049] (2) 150 g of deionized water was added and stirred evenly, and a dehydration condensation reaction was carried out for 1 hour. After the reaction was completed, the mixture was filtered to obtain a filtered product.

[0050] (3) Add 150 g to 180 g of chloroform to the filtered product and stir evenly, add 160 g of fuming sulfuric acid as a sulfonating agent, control the reaction temperature at 120° C., the reaction time for 1 h, and the stirring speed at 60 rpm;

[0051] (4) slowly adding NaCO3 and K2CO3, and controlling the weight ratio of the two to be 1:1, adjusting the pH value of the solution to 7, and obtaining the product;

[0052] (5) cooling the product, filtering, washing, and centrifuging and drying to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0053] (6) The filtrate is distilled under reduced pressure to recover ethanol and chloroform, and then the emulsifier powder is recovered by spray drying.

[0054] Example 3

[0055] (1) Weigh 120g-150g of ethanol and 60g-80g of phenyltriethoxysilane in a dry reactor and mix them evenly. Add ammonia water to make the pH value of the reaction system equal to 10. Then heat the reactor and control the reaction temperature to 60±2℃. Slowly add 50g-100g of polytetrafluoroethylene emulsion.

[0056] (2) 150 g of deionized water was added and stirred evenly, and a dehydration condensation reaction was carried out for 1 hour. After the reaction was completed, the mixture was filtered to obtain a filtered product.

[0057] (3) Add 150 g to 180 g of chloroform to the filtered product and stir evenly, add 160 g of fuming sulfuric acid as a sulfonating agent, control the reaction temperature at 120° C., the reaction time for 1 h, and the stirring speed at 60 rpm;

[0058] (4) slowly adding NaCO3 and adjusting the solution pH to 7 to obtain the product;

[0059] (5) cooling the product, filtering, washing, and centrifuging and drying to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0060] (6) The filtrate is distilled under reduced pressure to recover ethanol and chloroform, and then the emulsifier powder is recovered by spray drying.

[0061] Example 4

[0062] (1) First, 120 g to 150 g of ethanol, 30 g to 40 g of phenyltriethoxysilane, and 30 g to 40 g of octaphenylcyclotetrasiloxane are weighed and mixed uniformly in a dry reactor in advance, and ammonia water is added dropwise to make the pH value of the reaction system = 10, and then the reactor is heated and the reaction temperature is controlled to 60 ± 2 ° C, and 50 g to 100 g of polytetrafluoroethylene emulsion is slowly added dropwise;

[0063] (2) 150 g of deionized water was added and stirred evenly, and a dehydration condensation reaction was carried out for 1 hour. After the reaction was completed, the mixture was filtered to obtain a filtered product.

[0064] (3) Add 150 g to 180 g of chloroform to the filtered product and stir evenly, add 160 g of fuming sulfuric acid as a sulfonating agent, control the reaction temperature at 120° C., the reaction time for 1 h, and the stirring speed at 60 rpm;

[0065] (4) Slowly adding K2CO3 and adjusting the solution pH to 7 to obtain the product;

[0066] (5) cooling the product, filtering, washing, and centrifuging and drying to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0067] (6) The filtrate is distilled under reduced pressure to recover ethanol and chloroform, and then the emulsifier powder is recovered by spray drying.

[0068] Example 5

[0069] (1) First, 120 g to 150 g of ethanol, 30 g to 40 g of diphenyldiethoxysilane, and 30 g to 40 g of octaphenylcyclotetrasiloxane are weighed and mixed uniformly in a dry reactor, and ammonia water is added dropwise to make the pH value of the reaction system = 10, and then the reactor is heated and the reaction temperature is controlled to 60 ± 2 ° C, and 50 g to 100 g of polytetrafluoroethylene emulsion is slowly added dropwise;

[0070] (2) 150 g of deionized water was added and stirred evenly, and a dehydration condensation reaction was carried out for 1 hour. After the reaction was completed, the mixture was filtered to obtain a filtered product.

[0071] (3) Add 150 g to 180 g of chloroform to the filtered product and stir evenly, add 160 g of fuming sulfuric acid as a sulfonating agent, control the reaction temperature at 120° C., the reaction time for 1 h, and the stirring speed at 60 rpm;

[0072] (4) Slowly adding K2CO3 and adjusting the solution pH to 7 to obtain the product;

[0073] (5) cooling the product, filtering, washing, and centrifuging and drying to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0074] (6) The filtrate is distilled under reduced pressure to recover ethanol and chloroform, and then the emulsifier powder is recovered by spray drying.

[0075] Example 6

[0076] (1) Weigh 120g-150g of ethanol, 30g-40g of diphenyldiethoxysilane, and 30g-40g of octaphenylcyclotetrasiloxane in a dry reactor and mix them evenly. Add ammonia water dropwise to make the pH value of the reaction system = 10. Then heat the reactor and control the reaction temperature to 60±2°C. Slowly add 50g-100g of polytetrafluoroethylene emulsion dropwise.

[0077] (2) 150 g of deionized water was added and stirred evenly, and a dehydration condensation reaction was carried out for 1 hour. After the reaction was completed, the mixture was filtered to obtain a filtered product.

[0078] (3) Add 150 g to 180 g of chloroform to the filtered product and stir evenly, add 160 g of fuming sulfuric acid as a sulfonating agent, control the reaction temperature at 120° C., the reaction time for 1 h, and the stirring speed at 60 rpm;

[0079] (4) slowly adding Na2CO3 and adjusting the solution pH to 7 to obtain the product;

[0080] (5) cooling the product, filtering, washing, and centrifuging and drying to obtain a flame retardant and anti-drip molecular synergist and a filtrate;

[0081] (6) The filtrate is distilled under reduced pressure to recover ethanol and chloroform, and then the emulsifier powder is recovered by spray drying.

[0082] Performance inspection test

[0083] Through the methods of the above embodiments 1, 2, 3, 4, 5, and 6, a flame retardant and anti-dripping molecular synergist can be prepared. The flame retardant plastics are used as follows:

[0084] The flame retardant and anti-dripping synergists prepared in Examples 1 to 6 were melt-granulated with PC resin in a twin-screw extruder at a ratio of 0.2%.

[0085] In order to further illustrate the excellent performance of the synergist of the present invention, the granulated product of the PC resin with the synergist of the present invention, the product with the common flame retardant and anti-drip compound synergist, and the PC resin without the synergist were first granulated by water-cooling on a twin-screw granulator, and then injection molded on an injection molding machine at a suitable temperature to prepare the test specimens. The specimens of the test injection number were burned horizontally and vertically to test the flame retardancy of the product, the processing performance during the processing, and the surface gloss of the product by observation. The test results are shown in Table 1 below.

[0086] Table 1 Performance inspection test results

[0087]

[0088]

[0089] By comparing the performance test table of Examples 1-6, Comparative Examples 1-2 and Table 1, it is found that the PC resin to which the flame retardant and anti-dripping synergist prepared in any one of the embodiments of the present invention is added has good flame retardant and anti-dripping properties, high gloss, and stable processing and granulation process.

[0090] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing a flame retardant and anti-drip molecular synergist, characterized in that: The following steps are involved: S1: Stir and mix the phenylsiloxane monomer and the organic solvent in a reactor in advance, add the acidic catalyst solution or the alkaline catalyst solution dropwise, stir and mix evenly, and heat to 50°C to 90°C, then slowly add the polytetrafluoroethylene emulsion dropwise, stir and mix evenly, and obtain a mixed solution; S2: After the dropwise addition is completed, deionized water is added to the mixed solution and stirred evenly to cause a hydrolysis, dehydration and condensation reaction for 1 h to 2 h. After the reaction is completed, the product is filtered to obtain a filtered product; S3: adding an organic solvent to the filtered product and stirring evenly, then adding a sulfonating agent for sulfonation, the reaction temperature is controlled at 100°C to 120°C, the reaction time is controlled at 0.5h to 2h, and the stirring speed is controlled at 30 to 60 rpm; S4: after the reaction is completed, an alkaline substance is added to neutralize the product, and the product is filtered, washed, and centrifuged to dry to obtain a flame retardant and anti-drip molecular synergist and a filtrate; S5: After distilling the filtrate to recover the organic solvent, the filtrate is passed through a drying device to recover the emulsifier.

2. The method for preparing the flame retardant and anti-dripping molecular synergist according to claim 1, characterized in that: The phenylsiloxane monomer is selected from one or a mixture of phenyltrimethoxysilane, phenyltriethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane and octaphenylcyclotetrasiloxane.

3. The method for preparing the flame retardant and anti-dripping molecular synergist according to claim 1, characterized in that: The organic solvent in step S1 is selected from one or a mixture of ether, toluene, ethanol, acetone and isopropanol; the organic solvent in step S3 is selected from one or a mixture of two of dichloromethane and chloroform.

4. The method for preparing the flame retardant and anti-dripping molecular synergist according to claim 1, characterized in that: The acidic catalytic solution is selected from one or a mixture of HCl, H2SO4 and HNO3, the alkaline catalyst solution is selected from one or a mixture of NaOH, KOH, ammonia water and K2CO3; the sulfonating agent is selected from one or a mixture of concentrated sulfuric acid, oleum and aminosulfonic acid.

5. The method for preparing the flame retardant and anti-dripping molecular synergist according to claim 4, characterized in that: The pH value of the mixed solution is controlled within the range of 1 to 4 under the control of the acidic catalyst solution, and the pH value of the mixed solution is controlled within the range of 9 to 11 under the control of the alkaline catalyst solution.

6. The method for preparing a flame retardant and anti-dripping molecular synergist according to claim 1, characterized in that: The particle size of the polytetrafluoroethylene emulsion is between 90nm and 150nm.

7. The method for preparing a flame retardant and anti-dripping molecular synergist according to claim 1, characterized in that: The weight ratio of the phenylsiloxane monomer to the polytetrafluoroethylene emulsion is 5:1 to 1:

5.

8. The method for preparing a flame retardant and anti-dripping molecular synergist according to claim 1, characterized in that: The weight ratio of the mixed solution to the deionized water is 1:1 to 1:5; the mass ratio of the filtered product to the sulfonating agent is 1:1 to 1:

2.

9. The method for preparing a flame retardant and anti-dripping molecular synergist according to claim 1, characterized in that: The alkaline substance is selected from one or a mixture of KOH, NaOH, NaCO3 and K2CO3.

10. A flame retardant and anti-drip molecular synergist, characterized in that: include: A synergist prepared by the preparation method of claim 1.

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