CN101456936B - Flame-retardant interface modifier and preparation method and flame-retardant polycarbonate composition - Google Patents

Abstract

The invention discloses a flame-retardant interface modifier, a preparation method thereof and a flame-retardant polycarbonate composition. The flame-retardant interface modifier comprises two parts of high phenyl polysilsesquioxane and polyacrylate which are combined through vinyl free radical polymerization reaction. The preparation method comprises the steps of sequentially carrying out emulsion copolymerization on the high-phenyl polysilsesquioxane, the acrylic esters and the methacrylic esters, and then carrying out demulsification and drying. The flame retardant polycarbonate composition comprises: 97.8-99.3 parts by mass of polycarbonate, 0.1-1.0 part by mass of flame-retardant interface modifier, 0.05-1.0 part by mass of fluororesin and 0.05-1.0 part by mass of organic sulfonate. The total amount of the three flame retardants is 0.5 part, so that a polycarbonate composition bar with the thickness of 1.6mm can reach UL94V-0 grade, and the composition can be used for manufacturing various office automation, electronic and electrical equipment and the like.

Description

Flame-retardant interface modifier and preparation method and flame-retardant polycarbonate composition

technical field

The present invention relates to a flame retardant interface modifier, in particular to a high phenyl organopolysilsesquioxane which can endow polycarbonate thermoplastic resins with flame retardant properties and a polycarbonate which has excellent interfacial interaction with polycarbonate Polyacrylate, the two parts are combined through polycondensation reaction and vinyl radical polymerization reaction, specifically relate to the flame retardant interface modifier and preparation method and a flame retardant polycarbonate combination comprising the flame retardant interface modifier thing.

Background technique

Organic polysilsesquioxane has excellent high temperature resistance, oxidative degradation resistance and environmental friendliness. It is widely used in high-performance plastic additives and insulating materials in the microelectronics industry. In recent years, its application in flame retardants has begun to attract attention. . Polyacrylates are widely used as low temperature impact modifiers and chain extenders for thermoplastic resins. The linear polysiloxane-modified acrylate copolymer emulsion produced by ring-opening polymerization of a small amount of organosilicon monomer octamethylcyclotetrasiloxane (D4) can not only improve the film-forming property of the coating, but also improve its heat resistance It has attracted attention in the application of latex, and it has also been studied as an impact modifier for thermoplastics, and the acrylate-modified high-phenyl polysilsesquioxane compound is used as a polycarbonate flame-retardant interface Modifiers have not been reported.

Polycarbonate is widely used in the automotive industry, construction industry, and electrical and electronic industries due to its excellent transparency, impact strength, and creep resistance. It has the fastest growth rate among the five general-purpose engineering plastics, and currently ranks first in usage. Polycarbonate itself is flammable and will drip hot melt, causing nearby materials to catch fire. With the improvement of flame retardant performance requirements for electronic and electrical products, its flame retardant modification is becoming more and more important. At present, the flame retardants commonly used are halogen flame retardants, phosphorus flame retardants, etc. Due to environmental pollution problems of halogen flame retardants, developed countries or regions such as Western Europe, North America, and Japan have successively promulgated and implemented non-standard flame retardants. The ban on halogenated flame retardants; the large amount of phosphorus flame retardants has a great impact on the performance of polycarbonate. Environmentally friendly organopolysiloxanes can be used as flame retardants for polycarbonates. The existing Chinese patent (Patent No. ZL 03800721.5) discloses a polyorganosiloxane and a vinyl monomer containing at least two A thermoplastic resin composition in which a graft copolymer of polyorganosiloxane formed by graft copolymerization of polyfunctional monomers with unsaturated bonds, an alkali metal salt, and a fluororesin are jointly flame-retardant, but the graft copolymer polyorganosiloxane The main skeleton of siloxane is polydimethylsiloxane, polymethylphenylsiloxane and dimethylsiloxane-diphenylsiloxane copolymer, without any trifunctionality or more Not only the reaction temperature of polysiloxane polymerization part is above 70℃, but also the flame retardant efficiency is not high. In the case of compounding alkali metal salt and fluororesin, the usage amount of the graft copolymer still reaches the quality of polycarbonate 3%.

Contents of the invention

The invention aims to overcome the problems in the prior art, and provides a high phenyl organopolysilsesquioxane/acrylate compound flame retardant interface modifier with both high flame retardancy and interface modification functions.

Another object of the present invention is to provide a preparation method of the above-mentioned flame retardant interface modifier.

Another object of the present invention is to provide a flame-retardant polycarbonate composition prepared by using the above-mentioned flame-retardant interface modifier.

The purpose of the present invention is achieved through the following technical solutions:

A preparation method of a flame-retardant interface modifier, comprising the steps of:

(1) Add difunctional organosilane and trialkoxysilane organosilane monomer sequentially or evenly after mixing them into the aqueous solution in which anionic emulsifier or compound emulsifier is dissolved, and react at 30-60°C for 6-12 hours , to obtain a high phenyl organopolysilsesquioxane emulsion; the difunctional organosilane accounts for 10% to 45% by mole of the organosilane monomer, and the mole percentage of the organosilane monomer occupied by the trialkoxysilane is 50% to 85% %; the total mass of organosilane monomers is 25% to 40% of the water mass; the amount of emulsifier is 0.5% to 10% of the total mass of organosilane monomers, and the compound emulsifier is a mass ratio of 0.5 to 3:1 A mixture of anionic and nonionic emulsifiers;

(2) Adjust the pH value of the high phenyl organopolysilsesquioxane emulsion obtained in step (1) to 8-11 with alkaline solution, then add sodium dodecylbenzenesulfonate emulsifier, initiator and acrylate React for 4-8 hours at 50-95°C; then add sodium dodecylbenzenesulfonate emulsifier, initiator and methacrylate monomer, react for 4-8 hours at 50-95°C , to obtain a high phenyl organopolysilsesquioxane/acrylate composite emulsion, add a metal salt solution 0.5 to 2 times the quality of the emulsion, heat at 60 to 100°C for 5 to 10 hours, and wash the precipitated product , drying, to obtain high phenyl organopolysilsesquioxane/acrylate compound flame retardant interfacial modifier; wherein, sodium dodecylbenzenesulfonate consumption is the mass of acrylate or methacrylate monomer 0.5% to 5% of the mass of the initiator; the amount of the initiator is 0.1% to 1% of the mass of the acrylate or methacrylate monomer, and it is added at one time or added dropwise to an aqueous solution with a concentration of 10% by mass; The molar ratio of methacrylates and acrylates to acrylates is 0.5 to 5:1, and the ratio of the total moles of methacrylates and acrylates to the total moles of organosilane monomers is 0.15 to 1.5:1. The method adopts batch method, semi-continuous addition method, continuous addition method or pre-emulsification method.

In order to further realize the object of the present invention, the difunctional organosilane described in step (1) is octamethylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, diphenyldimethoxysilane, Phenyldiethoxysilane, Diphenyldihydroxysilane, Dimethyldimethoxysilane, Dimethyldiethoxysilane, γ-Methacryloxypropylmethyldimethoxysilane , one or more of γ-methacryloxypropyltrimethoxysilane and γ-methacryloxypropylmethyldiethoxysilane;

The trialkoxysilane is methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane One or more of methoxysilane and methacryloxypropyltrimethoxysilane;

Among the above organosilane monomers, difunctional organosilane and trialkoxysilane are necessary, and tetraalkoxysilane tetramethoxysilane and tetraethoxysilane can be used according to the situation.

The anionic emulsifier is dodecylbenzenesulfonic acid, tetradecylbenzenesulfonic acid or hexadecylbenzenesulfonic acid.

The nonionic emulsifier is nonylphenol polyoxyethylene ether or polyethylene glycol lauryl ether.

The acrylic monomer described in step (2) is monofunctional monomer methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate and polyfunctional monomer acrylic acid with at least two polymerizable unsaturated bonds. One or more of allyl ester and trimethylolpropane triacrylate.

The methacrylate monomer in step (2) is one or more of a monofunctional monomer and a multifunctional monomer; the monofunctional monomer is methyl methacrylate, ethyl methacrylate or Butyl methacrylate; the polyfunctional monomer is allyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, ethylene glycol dimethacrylate, propylene glycol dimethacrylate , 1,3-butanediol dimethacrylate or 1,4-butanediol dimethacrylate.

The initiator described in step (2) is an inorganic peroxygen initiator or a redox initiation system; the inorganic peroxygen initiator is potassium persulfate or ammonium persulfate; the redox initiation system is potassium sulfate- Sodium bisulfite, potassium persulfate-sodium thiosulfate or tert-butyl hydroperoxide-ferrous salt; the metal salt solution is 10% by mass concentration of sodium salt, calcium salt, magnesium salt, aluminum salt or potassium salt solution.

A flame retardant interfacial modifier, composed of high phenyl polysilsesquioxane and polyacrylate through vinyl radical polymerization, high phenyl organopolysilsesquioxane and polyacrylate in the compound The mass ratio is 0.8~10; the structural formula of high phenyl organopolysilsesquioxane is: (R ₂ R ₃ SiO)x(R ₁ SiO _3/2 )y(SiO _4/2 )z, where x=0.1~ 0.45, y=0.5~0.85, z=0~0.3, x+y+z=1, R ₁ , R ₂ and R ₃ are methyl, phenyl, propyl, vinyl and methacryloxypropyl The molar percentage of the phenyl group in the organopolysilsesquioxane side group is 50% to 90%, and the sum of the vinyl group and the methacryloxypropyl group is 2% to 20% in molar percentage; the rest is methyl and propyl;

The polyacrylate is composed of polymethacrylate and polyacrylate, and the molar ratio of the two reactive monomers, methacrylate and acrylate, is 0.5-5:1.

Flame-retardant polycarbonate composition, comprising 97.8-99.3 parts by mass of polycarbonate, 0.1-1.0 parts by mass of flame-retardant interface modifier, 0.05-1.0 parts by mass of fluororesin, and 0.05-1.0 parts by mass of organic sulfonic acid Salt.

The organic sulfonate is potassium perfluorobutyl sulfonate and potassium diphenyl sulfone sulfonate; the fluororesin is polytetrafluoroethylene, polyvinylidene fluoride, polyhexafluoroethylene, poly(tetrafluoroethylene-hexafluoroethylene), Styrene-acrylonitrile copolymer coated polytetrafluoroethylene.

Conventional additives in the processing technology of the above-mentioned flame retardant polycarbonate composition can be added in the method of the present invention, these additives include but not limited to antioxidant, plasticizer, release agent, light stabilizer, heat stabilizer, pigment, Dye, color masterbatch.

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

(1) Flame-retardant interfacial modifier of the present invention is compounded with polytetrafluoroethylene and organic sulfonate to have a very obvious flame-retardant effect on polycarbonate, and the total consumption is lower than 0.5wt% to make 1.6mm thick spline reach UL94V-0 Grade, and without adding any other impact modifiers and compatibilizers, it maintains the original excellent impact strength and other mechanical properties of polycarbonate, and has interface modification.

(2) In the preparation method of the graft copolymer of polyorganosiloxane, the emulsion polymerization temperature of polyorganosiloxane is relatively high, generally above 70°C, while the high phenyl polysilsesquioxane in the method of the present invention The emulsion polymerization temperature is lower than 60°C.

Description of drawings

Fig. 1 is the infrared spectrogram of the flame retardant interface modifier I in Example 1 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with specific examples, but the protection scope of the present invention is not limited to the scope involved in the examples.

Example 1

The first step: add 880g of deionized water, 1.5g of tetradecylbenzenesulfonic acid and polyethylene glycol with a mass ratio of 3 in a four-necked flask equipped with a stirrer, a constant pressure dropping funnel, a thermometer and a reflux condenser. Alcohol lauryl ether composite emulsifier, add dropwise 14.8g octamethyltetrasiloxane, 64.8g diphenyldihydroxysilane, 46.2g γ-methacryloxypropylmethyldimethoxysilane , reacted at 60° C. for 5 hours, then lowered the temperature to 30° C., added dropwise 118.8 g of phenyltrimethoxysilane and reacted for 6 hours to obtain a high phenyl organopolysilsesquioxane emulsion.

Step 2: Use 0.2mol/L ammonia solution to adjust the pH value of the emulsion to 8-10, pass nitrogen into the reaction system and raise the temperature to 60°C, add 1.6g sodium dodecylbenzenesulfonate and 0.03g persulfuric acid Potassium-sodium thiosulfate initiation system, drop 30.8g hexyl acrylate, react for 8 hours to obtain polysilsesquioxane-hexyl acrylate emulsion; add 0.38g sodium dodecylbenzenesulfonate and 0.76g persulfuric acid Potassium, a mixture of 59.3 g of ethyl methacrylate and 16 g of allyl methacrylate was added dropwise, and reacted at 80° C. for 8 hours to obtain a polysilsesquioxane-hexyl acrylate-methacrylate emulsion. Use 10wt% sodium chloride twice as much as the emulsion to heat at 100°C for 6 hours to break the emulsion, then suction filter, wash, and dry to obtain the flame retardant interface modifier I. Its infrared spectrum is shown in Figure 1, which can be The characteristic peaks of phenyl group, methyl group, acrylate group and silicon-oxygen bond are clearly seen, indicating that the product is a high phenyl organopolysilsesquioxane/acrylate compound.

Example 2

The first step: Add 880g of deionized water, 30.0g of dodecylbenzenesulfonic acid and nonylphenol with a mass ratio of 0.5 to a four-necked flask equipped with a stirrer, a constant pressure dropping funnel, a thermometer and a reflux condenser. Polyoxyethylene ether composite emulsifier, slowly drop 211.8g phenyltrimethoxysilane, 12.7g tetramethoxysilane, 25.2g dimethyldiethoxysilane, 51.8g vinyltrimethoxysilane Add and react at 30°C for 12 hours to obtain a high phenyl organopolysilsesquioxane emulsion.

Step 2: Use 2mol/L potassium hydroxide solution to adjust the pH value of the emulsion to 9-10, pass nitrogen into the reaction system and raise the temperature to 90°C, add 9.5g butyl acrylate, 0.5g dodecylbenzenesulfonate Sodium acid pre-emulsified for 1 hour, then dropwise added an aqueous solution containing 0.05g ammonium persulfate, and continued to react for 4 hours to obtain a polysilsesquioxane-butyl acrylate emulsion; add 28.4g butyl methacrylate, 4.5g dimethyl 1,4-butanediol acrylate and 1.6g sodium dodecylbenzenesulfonate were pre-emulsified for 1 hour, then an aqueous solution containing 0.16g potassium persulfate was added dropwise, and the reaction was continued for 6 hours at 95°C to obtain polysequivalent Silicone-butyl acrylate-methacrylate emulsion. Heat 10wt% aluminum sulfate solution 0.5 times of the emulsion at 70°C for 9 hours to break the emulsion, then suction filter, wash and dry to obtain the flame retardant interface modifier II.

Example 3

The first step: 120g phenyltriethoxysilane, 18.7g tetraethoxysilane, 26.6g octamethylcyclotetrasiloxane, 46.2g diphenyldiethoxysilane, 9.9g gamma-methylpropene Acyloxypropyltrimethoxysilane is mixed evenly, and one-tenth of it is added to a tank equipped with a stirrer, a constant pressure dropping funnel, a thermometer and a reflux condenser, which has added 880g of deionized water and 4.0g of dodecyl In a 2000mL four-necked flask of benzenesulfonic acid, react at 40°C for half an hour to obtain a blue polysilsesquioxane seed emulsion; add 2.0g of dodecylbenzenesulfonic acid, and add the remaining nine-tenths of The silane monomer mixture was reacted at 40°C for 8 hours to obtain a high phenyl organopolysilsesquioxane emulsion.

Step 2: Use 0.2mol/L sodium hydroxide solution to adjust the pH value of the emulsion to 9-10, pass nitrogen into the reaction system and raise the temperature to 95°C, add 0.5g sodium dodecylbenzenesulfonate, 1.0g Potassium persulfate initiator, add dropwise 99g octyl acrylate, continue to react for 4 hours, obtain polysilsesquioxane-octyl acrylate emulsion; add 3.0g sodium dodecylbenzenesulfonate and 0.061g potassium persulfate, drop Add 61 g of methyl methacrylate, and continue to react at 90°C for 8 hours to obtain a polysilsesquioxane-octyl acrylate-methyl methacrylate emulsion. Add an equal amount of 10wt% calcium chloride solution into the emulsion, heat at 100°C for 5 hours to break the emulsion, then filter with suction, wash and dry to obtain the flame retardant interface modifier III.

Example 4

The first step: add 880g of deionized water, 18.5g of hexadecylbenzenesulfonic acid and nonylphenol with a mass ratio of 0.5 to a four-necked flask equipped with a stirrer, a constant pressure dropping funnel, a thermometer and a reflux condenser Polyoxyethylene ether compound emulsifier, slowly drop and mix uniformly 237.6g phenyltrimethoxysilane, 45.4g diphenyldimethoxysilane, 20.9g γ-methacryloxypropylmethyl dimethoxy The base silane mixture was reacted at 30°C for 8 hours to obtain a high phenyl organopolysilsesquioxane emulsion.

Step 2: Use 2mol/L sodium hydroxide solution to adjust the pH value of the emulsion to 9-11, pass nitrogen into the reaction system and raise the temperature to 50°C, add 2.0g sodium dodecylbenzenesulfonate, 0.4g tert- Butyl hydroperoxide-ferrous salt, add dropwise 49.5g octyl acrylate and 5.0g trimethylolpropane triacrylate, continue to react for 6 hours, obtain polysilsesquioxane-acrylate emulsion; add 0.5g ten Sodium dialkylbenzenesulfonate and 0.1g tert-butyl hydroperoxide-ferrous salt redox initiator system, 23g methyl methacrylate was added dropwise, and the reaction was continued for 10 hours at 50°C to obtain polysilsesquioxane- Acrylates-methyl methacrylate emulsion. Use 10wt% magnesium chloride solution twice as large as the emulsion to heat at 90°C for 7 hours to break the emulsion, then filter with suction, wash and dry to obtain the flame retardant interface modifier IV.

Example 5

The first step: add 880g of deionized water, 10.0g of dodecylbenzenesulfonic acid and polyethylene glycol with a mass ratio of 1 in a four-necked flask equipped with a stirrer, a constant pressure dropping funnel, a thermometer and a reflux condenser. Alcohol lauryl ether composite emulsifier, slowly drop and mix uniformly 57.1g diphenyldiethoxysilane, 180g phenyltriethoxysilane, 68.4g tetramethoxysilane, 23.4g γ-methylpropene Acyloxypropylmethyldiethoxysilane was reacted at 60°C for 6 hours to obtain a high phenyl organopolysilsesquioxane emulsion.

Step 2: Use 2mol/L potassium hydroxide solution to adjust the pH value of the emulsion to 9-11, pass nitrogen into the reaction system and raise the temperature to 60°C, add 0.48g sodium dodecylbenzenesulfonate and 12.0g acrylic acid Methyl ester, pre-emulsified for 1 hour, then added dropwise an aqueous solution containing 0.048g potassium persulfate-sodium bisulfite, and continued to react for 6 hours to obtain a polysilsesquioxane-methyl acrylate emulsion; add 0.28g dodecyl 7g of methyl methacrylate of sodium benzenesulfonate, pre-emulsified for 1 hour, then dropwise added an aqueous solution containing 0.028g of ammonium persulfate, and continued the reaction at 85°C for 8 hours to obtain polysilsesquioxane-methyl acrylate-methacrylic acid Acrylate emulsion. Use 10wt% aluminum sulfate solution 1 times the amount of the emulsion to heat at 60°C for 10 hours to break the emulsion, then filter with suction, wash and dry to obtain the flame retardant interface modifier V.

Example 6

Step 1: Add 880 g of deionized water and 6.0 g of cetylbenzenesulfonic acid into a four-neck flask equipped with a stirrer, a constant pressure dropping funnel, a thermometer and a reflux condenser, and slowly add 240 g of benzene, which is uniformly mixed, dropwise. Triethoxysilane, 13.6g methyltrimethoxysilane, 30g dimethyldimethoxysilane and 17.2g tetramethyltetravinylcyclotetrasiloxane were reacted at 50°C for 8 hours to obtain high Phenyl organopolysilsesquioxane emulsion.

Step 2: Use 2mol/L potassium hydroxide solution to adjust the pH value of the emulsion to 9-10, pass nitrogen into the reaction system and raise the temperature to 75°C, add 0.1g sodium dodecylbenzenesulfonate and 10g ethyl acrylate Ester, pre-emulsified for 1 hour, then added dropwise an aqueous solution containing 0.02g ammonium persulfate, and reacted for 8 hours to obtain a polysilsesquioxane-ethyl acrylate emulsion; add 2.0g sodium dodecylbenzenesulfonate and 44g formazan methyl methacrylate, 9.0g hydroxypropyl methacrylate, pre-emulsified for 1 hour, then dropwise added an aqueous solution containing 0.4g potassium persulfate, and continued the reaction at 90°C for 4 hours to obtain polysilsesquioxane-ethyl acrylate - Methacrylate emulsion. Use 10wt% potassium chloride solution twice as large as the emulsion to heat at 80°C for 8 hours to break the emulsion, then filter with suction, wash and dry to obtain the flame retardant interface modifier VI.

Examples 7-10

Disperse and mix polycarbonate, the flame retardant interfacial modifiers of Examples 1 to 4, organic sulfonate, fluororesin, antioxidant, etc. according to the ratio in Table 1, then melt, extrude, cool, and dry through a twin-screw machine , pelletizing and packaging. The temperature of each section of the barrel of the twin-screw extruder used should be kept at 240-290°C. The compositions prepared in Examples 7-10 were injection molded into test standard specimens according to standard sizes, and tested according to international standards respectively. The performance test results are shown in Table 1.

                            Table 1, Raw material ratios and test results

performance Example 7 Example 8 Example 9 Example 10 control sample Polycarbonate (parts) 99.3 97.8 98.0 98.0 98.8 Flame retardant interface modifier (parts) 0.1(I) 1.0(II) 0.45(III) 0.40(IV) 0 Fluorine resin (parts) 0.2 (polytetrafluoroethylene) 0.5 (coated with polytetrafluoroethylene) 1.0 (polyvinylidene fluoride) 0.05 (polyhexafluoroethylene) 0.5 (coated with polytetrafluoroethylene) Organic sulfonate (parts) 0.2 (potassium diphenyl sulfone sulfonate) 0.2 (potassium diphenyl sulfone sulfonate) 0.05 (potassium perfluorobutane sulfonate) 1.0 (potassium perfluorobutane sulfonate) 0.2 (potassium diphenyl sulfone sulfonate) Other (parts) 0.2 0.5 0.5 0.5 0.5 Izod notched impact strength (KJ/m ² ) 64.3 69.6 65.2 65.6 27.1 Tensile strength (MPa) 65.5 63.8 65.6 66.7 63.7 Bending strength (MPa) 78.2 75.9 78.6 79.1 75.8 Elongation at break (%) 145 158 139 141 151 UL94 combustion rating (1.6mm) V-0 V-0 V-0 V-0 NR

It can be seen from the table that 0.1% to 1.0% of the flame retardant interface modifier and organic sulfonate, fluororesin, and antioxidant compound modified polycarbonate can make the 1.6mm thick polycarbonate composition sample reach UL94V -0 grade, and without adding any other impact modifiers and compatibilizers, it maintains the original excellent impact strength and other mechanical properties of polycarbonate. Without adding flame retardant interface modifier, only adding potassium diphenyl sulfone sulfonate and coating polytetrafluoroethylene carbonate composition as a control sample not only fails to reach a certain level in combustion performance, but also has a significant drop in impact strength. This shows that the flame retardant interface modifier of the present invention has both flame retardant and interface modification functions.

Claims (6)

1. a preparation method of flame retardant interfacial modifier, is characterized in that comprising the steps: (1) Add difunctional organosilane and trialkoxysilane organosilane monomer sequentially or evenly after mixing them into the aqueous solution in which anionic emulsifier or compound emulsifier is dissolved, and react at 30-60°C for 6-12 hours , to obtain a high phenyl organopolysilsesquioxane emulsion; the difunctional organosilane accounts for 10% to 45% of the mole percentage of the organosilane monomer, and the mole percentage of the organosilane monomer occupied by the trialkoxysilane is 50% to 85%. %; the total mass of organosilane monomers is 25% to 40% of the water quality; the amount of emulsifier is 0.5% to 10% of the total mass of organosilane monomers, and the compound emulsifier is a mass ratio of 0.5 to 3:1 The mixture of anionic emulsifier and nonionic emulsifier; described anionic emulsifier is dodecylbenzenesulfonic acid, tetradecylbenzenesulfonic acid or hexadecylbenzenesulfonic acid; described nonionic emulsifier is nonyl Phenol ethoxylate or polyethylene glycol lauryl ether; (2) Adjust the pH value of the high phenyl organopolysilsesquioxane emulsion obtained in step (1) to 8-11 with alkaline solution, then add sodium dodecylbenzenesulfonate emulsifier, initiator and acrylate React for 4-8 hours at 50-95°C; then add sodium dodecylbenzenesulfonate emulsifier, initiator and methacrylate monomer, react for 4-8 hours at 50-95°C , to obtain a high phenyl organopolysilsesquioxane/acrylate composite emulsion, add a metal salt solution 0.5 to 2 times the quality of the emulsion, heat at 60 to 100°C for 5 to 10 hours, and wash the precipitated product , drying, to obtain high phenyl organopolysilsesquioxane/acrylate compound flame retardant interfacial modifier; wherein, sodium dodecylbenzenesulfonate consumption is the mass of acrylate or methacrylate monomer 0.5% to 5% of the mass of the initiator; the amount of the initiator is 0.1% to 1% of the mass of the acrylate or methacrylate monomer, and it is added at one time or added dropwise to an aqueous solution with a concentration of 10% by mass; The molar ratio of methacrylates and acrylates to acrylates is 0.5 to 5:1, and the ratio of the total moles of methacrylates and acrylates to the total moles of organosilane monomers is 0.15 to 1.5:1. The method adopts batch method, semi-continuous addition method, continuous addition method or pre-emulsification method; the acrylate monomers are monofunctional monomers methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate and One or more of polyfunctional monomer allyl acrylate and trimethylolpropane triacrylate with at least two polymerizable unsaturated bonds; the initiator is an inorganic peroxygen initiator or a redox Initiation system; the inorganic peroxygen initiator is potassium persulfate or ammonium persulfate; the redox initiation system is potassium sulfate-sodium bisulfite, potassium persulfate-sodium thiosulfate or tert-butyl peroxide Hydrogen-ferrous salt; the metal salt solution is a 10% by mass concentration of sodium salt, calcium salt, magnesium salt, aluminum salt or potassium salt solution. 2. the preparation method of flame retardant interfacial modifier according to claim 1 is characterized in that the described difunctional organosilane of step (1) is octamethyl cyclotetrasiloxane, tetramethyl tetravinyl ring Tetrasiloxane, diphenyldimethoxysilane, diphenyldiethoxysilane, diphenyldihydroxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, γ- Methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane and γ-methacryloxypropylmethyldiethoxysilane one or more; The trialkoxysilane is methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane One or more of methoxysilane and methacryloxypropyltrimethoxysilane. 3. the preparation method of flame-retardant interfacial modifier according to claim 1 is characterized in that the described methacrylate monomer of step (2) is a kind of in monofunctional monomer and polyfunctional monomer or multiple; the monofunctional monomer is methyl methacrylate, ethyl methacrylate or butyl methacrylate; the multifunctional monomer is allyl methacrylate, hydroxyethyl methacrylate, Hydroxypropyl methacrylate, ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate or 1,4-butylene glycol dimethacrylate. 4. A flame-retardant interface modifier, prepared by the method claimed in claim 1, is characterized in that the flame-retardant interface modifier consists of high phenyl polysilsesquioxane and polyacrylate through vinyl radicals Polymerization combination, the mass ratio of high phenyl organopolysilsesquioxane and polyacrylate in the compound is 0.8-10; the structural formula of high phenyl organopolysilsesquioxane is: (R ₂ R ₃ SiO)x (R ₁ SiO _3/2 )y(SiO _4/2 )z, wherein x=0.1～0.45, y=0.5～0.85, z=0～0.3, x+y+z=1, R ₁ , R ₂ and R ₃ is one or more of methyl, phenyl, propyl, vinyl and methacryloxypropyl, and the molar percentage of phenyl in the side group of organopolysilsesquioxane is 50%~ 90%, the sum of vinyl and methacryloxypropyl is 2% to 20% by mole; the rest is methyl and propyl; The polyacrylate is composed of polymethacrylate and polyacrylate, and the molar ratio of the two reactive monomers, methacrylate and acrylate, is 0.5-5:1. 5. The flame retardant polycarbonate composition, characterized in that it comprises 97.8 to 99.3 parts by mass of polycarbonate, 0.1 to 1.0 parts by mass of a flame retardant interfacial modifier, 0.05 to 1.0 parts by mass of fluororesin, and 0.05 to 1.0 parts by mass The organic sulfonate of part; Described flame retardant interfacial modifier is the described flame retardant interfacial modifier of claim 4. 6. The flame retardant polycarbonate composition according to claim 5, characterized in that: the organic sulfonate is potassium perfluorobutyl sulfonate, potassium diphenyl sulfone sulfonate; the fluororesin is polytetrafluoroethylene Vinyl fluoride, polyvinylidene fluoride, polyhexafluoroethylene, poly(tetrafluoroethylene-hexafluoroethylene) or styrene-acrylonitrile copolymer coated polytetrafluoroethylene.

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