High-fluidity halogen-free flame-retardant PC / ABS material and preparation method thereof

Abstract

The invention relates to a high-fluidity halogen-free flame-retardant PC / ABS material and a preparation method thereof. The PC / ABS alloy material is prepared from the following raw materials in parts by weight: 20-50 parts of PC, 50-80 parts of ABS, 10-20 parts of a high-flow flame retardant and 1-5 parts of a processing aid, the high-fluidity flame retardant is composed of a flame-retardant compound, a polydimethylsiloxane derivative and a compatible plasticizer; the flame-retardant compound is composed of boron modified phenolic resin and a polyhedral oligomeric silsesquioxane material; the compatible plasticizer is a composition of a plurality of materials selected from maleic anhydride grafted SEBS, hydrogenated terpene resin and polyethylene oxide phosphate. The boron modified phenolic resin and the polyhedral oligomeric silsesquioxane material are compounded to achieve a synergistic flame-retardant effect, and are uniformly mixed with PC and ABS under the action of the polydimethylsiloxane derivative and the compatible plasticizer to form a stable flame-retardant system, and the flame-retardant PC / ABS composite material has better flowability and toughening property, and further improves the quality and qualified rate of precise electronic product parts.

Description

Technical Field

[0001] The present application relates to the field of polymer flame retardancy, and more specifically, to a high-flow halogen-free flame retardant PC / ABS material and a preparation method thereof. Background Art

[0002] In the field of engineering plastics, alloys of polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) (PC / ABS) are widely used in numerous industries, including electronics, electrical appliances, and automotive manufacturing, due to their excellent overall performance. With the continuous advancement of technology, the performance requirements for PC / ABS materials in various industries are becoming increasingly diverse and stringent. This is particularly true in areas with extremely high safety and product quality requirements, such as electronic equipment and automotive parts manufacturing, which pose greater challenges to the flame retardancy, mechanical properties, and molding processability of PC / ABS materials. This development trend has prompted researchers to continuously explore and improve the formulation and preparation processes of PC / ABS materials to meet market demand.

[0003] In the past, to ensure that halogen-free flame-retardant PC / ABS compositions meet certain flame retardancy standards, the common practice was to add inorganic and halogen flame retardants. Inorganic flame retardants, such as magnesium hydroxide and aluminum hydroxide, are commonly used. While these inorganic flame retardants can achieve V0 flame retardancy, they often negatively impact the material's fluidity and mechanical properties during use. Halogen flame retardants, primarily composed of halogen elements such as fluorine, chlorine, bromine, and iodine, achieve their flame retardant properties by inhibiting the combustion chain reaction. While achieving excellent flame retardancy, they can also maintain the fluidity and mechanical properties of PC / ABS materials to a certain extent. Furthermore, the overall performance of PC / ABS materials can be enhanced by adding maleic anhydride-grafted ABS, high-rubber powder, or plasticizers.

[0004] However, these existing technical means have obvious defects. When using inorganic flame retardants, although the flame retardant goal can be achieved, the fluidity and mechanical properties of the material are sacrificed, which is very unfavorable for production that requires precision injection molding, especially for those precision parts with complex shapes and high dimensional accuracy requirements. It is easy to cause dimensional deviations in the products produced, increasing the rate of defective products. Although the use of halogen flame retardants can ensure certain fluidity and mechanical properties as well as flame retardant effects, halogen substances are easy to pollute the environment and cause harm to human health. In addition, the addition of maleic anhydride grafted ABS, high glue powder or plasticizers, etc., for precision parts with extremely high dimensional accuracy requirements such as mobile phone middle frames, mobile phone buckles, SIM card trays, camera module brackets, complex circuit board supports, sensor housings in new energy vehicles, precision connectors in new energy vehicles, and battery management system related components, still finds it difficult to meet the requirements for dimensional precision and uniformity during the production process. Summary of the Invention

[0005] The purpose of this application is to overcome the above technical problems and provide a high-flow halogen-free flame-retardant PC / ABS material and a preparation method thereof.

[0006] In the first aspect, a high-flow halogen-free flame-retardant PC / ABS material is composed of the following raw materials in parts by weight: PC: 20-50 parts ABS: 50-80 copies High flow flame retardant: 10-20 parts Processing aids: 1-5 parts; The high-flow flame retardant is composed of a flame retardant compound, a polydimethylsiloxane derivative, and a compatible plasticizer; The flame retardant compound is composed of boron-modified phenolic resin and cage-type polysilsesquioxane material; The compatible plasticizer is a combination of multiple types selected from maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate, at least one of which is maleic anhydride grafted SEBS.

[0007] By employing this technical solution, the boron-modified phenolic resin and caged polysilsesquioxane compound achieve a synergistic flame-retardant effect. With the help of polydimethylsiloxane derivatives and compatible plasticizers, they can be evenly mixed with PC, ABS, and other materials to form a stable flame-retardant system. Polyethylene oxide phosphate reduces melt viscosity and improves melt flow, providing both lubrication and flame-retardant properties. Hydrogenated terpene resin penetrates polymer chains, reducing molecular entanglement and improving processing fluidity. The combination of the two further reduces melt viscosity, with even more pronounced effects at high shear rates.

[0008] Maleic anhydride grafted SEBS can enhance the impact strength and toughness of the material and improve the compatibility between PC and ABS. It has a synergistic effect when compounded with hydrogenated terpene resin and / or polyethylene oxide phosphate, giving the compatible plasticizer better compatibility, plasticizing fluidity and toughening effects. It synergistically promotes dispersion flow with polydimethylsiloxane derivatives, and promotes the compatibility of flame retardant compounds with the raw material system as well as PC and ABS, further improving the flame retardant properties, processing fluidity and mechanical properties of the material, so that the flame retardant grade of the final high-flow halogen-free flame-retardant PC / ABS material reaches VO grade. It is easy to injection mold when processing precision parts such as mobile phone card slots, forming a stable precision component structure, and the final product qualification rate is as high as over 95%.

[0009] Preferably, the weight ratio of the flame retardant compound, the polydimethylsiloxane derivative, and the compatible plasticizer is (3-5):1:(4-6).

[0010] By adopting the above technical solution, the weight ratio of the flame retardant compound, the polydimethylsiloxane derivative, and the compatible plasticizer is controlled to (3-5):1:(4-6), so that the three can better exert a synergistic effect, further promote the compatibility and dispersibility between the flame retardant compound, PC and ABS, improve the flame retardancy, fluidity and toughness of the material, ensure that when the mobile phone card slot is processed with halogen-free flame retardant PC / ABS material, it is easy to injection mold and the card slot structure is stable, and it can still maintain good performance after subsequent processes, thereby improving the qualification rate of the final product.

[0011] Preferably, the weight ratio of the boron-modified phenolic resin to the cage-type polysilsesquioxane material is 5:(2-3).

[0012] By adopting the above technical solution, the boron-modified phenolic resin and the cage-type polysilsesquioxane material are compounded in a weight ratio of 5:(2-3), which can synergize with polydimethylsiloxane derivatives and compatible plasticizers to further improve the flame retardant properties, so that the flame retardant grade of the final high-flow halogen-free flame retardant PC / ABS material reaches VO grade.

[0013] Preferably, the caged polysilsesquioxane material is polystyrene-poly(heptaisobutyl caged polysilsesquioxane propyl-methacrylate) and / or caged polysilsesquioxane-octaepoxy nano-silica dispersion.

[0014] By adopting the above technical solution, the use of polystyrene-poly(heptaisobutyl cage-type polysilsesquioxane propyl-methacrylate) can improve the flame retardancy, thermal stability, processing fluidity and mechanical properties of the material; the use of cage-type polysilsesquioxane-octaepoxy nanosilica dispersion can improve the flame retardancy, thermal stability, processing performance and mechanical properties of the material; and the combination of the two can enhance the flame retardancy, improve the thermal stability, improve the processing fluidity and enhance the mechanical properties.

[0015] Preferably, the caged polysilsesquioxane material is composed of polystyrene-poly(heptaisobutyl caged polysilsesquioxane propyl-methacrylate) and caged polysilsesquioxane-octaepoxy nano-silica dispersion, and the weight ratio of the two is 1:(1.8-2.5).

[0016] By adopting the above technical solution, polystyrene-poly (heptaisobutyl cage-type polysilsesquioxane propyl-methacrylate) and cage-type polysilsesquioxane-octaepoxy nano-silica dispersion are compounded at a ratio of 1: (1.8-2.5) as the cage-type polysilsesquioxane material, so that the POSS parts in the two materials can jointly form a denser inorganic oxygen-isolating and heat-insulating protective layer, more effectively isolating oxygen, heat and combustible gases, and improving flame retardant properties; the synergistic effect of POSS (cage-type polysilsesquioxane) and nano-silica can further improve the thermal stability of the material, so that it maintains better performance at high temperatures; the compounding can optimize the viscosity of the system, increase the melt index, improve the processing fluidity, and make the material easier to form and process; the synergistic effect of the nano-cage structure of POSS and nano-silica can enhance the mechanical properties of the material, such as hardness, strength and toughness, and improve the durability and reliability of the product.

[0017] Preferably, the polydimethylsiloxane derivative is polydimethylsiloxane-polytert-butyl methacrylate and / or polyethylene glycol-polydimethylsiloxane-polyethylene glycol.

[0018] By adopting the above technical scheme, the use of polydimethylsiloxane-polytert-butyl methacrylate can improve processing fluidity, enhance flame retardant properties and enhance mechanical properties; the use of polyethylene glycol-polydimethylsiloxane-polyethylene glycol can improve compatibility, enhance flame retardant properties and enhance flexibility; the combination of the two can enhance flame retardant properties, optimize processing fluidity, improve mechanical properties and enhance compatibility.

[0019] Preferably, the compatible plasticizer is composed of maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate in a weight ratio of 8: (0.5-1): (1-1.5).

[0020] By employing this technical solution, maleic anhydride-grafted SEBS as a toughening agent improves the material's impact strength and toughness, while also improving compatibility between PC and ABS. Hydrogenated terpene resin penetrates polymer chains, reducing molecular entanglement and improving processing fluidity. Polyethylene oxide phosphate reduces melt viscosity and improves melt flow, providing both lubrication and flame retardancy. A weight ratio of 8:(0.5-1):(1-1.5) of these three components allows the compatible plasticizer to combine excellent compatibility, plasticizing fluidity, and toughening. These components also synergistically promote dispersion and flow with the polydimethylsiloxane derivative, improving compatibility between the flame retardant compound, PC, and ABS. This results in excellent fluidity and toughness during processing. When used in the manufacture of mobile phone card slots, the resulting card slot structure is easily injection molded, and the resulting slot maintains excellent performance through subsequent processing steps, resulting in a final product qualification rate exceeding 95%.

[0021] Preferably, the processing aid is one or more of a release agent, stearic acid, a heat stabilizer, an anti-UV agent, an antioxidant, silicon nitride, hexagonal boron nitride, and a colorant.

[0022] By adopting the above technical solution, one or more of a release agent, stearic acid, a heat stabilizer, an anti-UV agent, an antioxidant, silicon nitride, hexagonal boron nitride, and a colorant are selected as processing aids in the high-flow halogen-free flame-retardant PC / ABS material. The release agent can improve the processing fluidity, stearic acid can be used as a lubricant to improve the processing performance, the heat stabilizer can improve the thermal stability of the material, the anti-UV agent can prevent the material from aging due to ultraviolet rays, the antioxidant can delay the aging process of the material, silicon nitride and hexagonal boron nitride can enhance the mechanical properties of the material, and the colorant can meet different color requirements.

[0023] Preferably, the processing aid consists of a release agent, an anti-UV agent, and an antioxidant.

[0024] By adopting the above technical solution and using a processing aid consisting of a release agent, stearic acid, a heat stabilizer, an anti-UV agent, and an antioxidant, the functions of different additives can be brought into play during the raw material processing process. The heat stabilizer can prevent the material from thermal decomposition during high-temperature processing, the anti-UV agent can improve the material's resistance to ultraviolet rays, the antioxidant can delay the aging of the material, silicon nitride and hexagonal boron nitride can improve certain properties of the material, and the release agent and stearic acid can improve the processing fluidity of the material, thereby ensuring the comprehensive performance of high-flow halogen-free flame-retardant PC / ABS materials.

[0025] In a second aspect, a method for preparing a high-flow halogen-free flame-retardant PC / ABS material comprises the following steps: High flow flame retardant: According to parts by weight, weigh the flame retardant compound, polydimethylsiloxane derivative, and compatible plasticizer and mix them evenly to obtain a high flow flame retardant; According to parts by weight, PC, ABS, and processing aid were weighed and mixed evenly to obtain a mixture A; A high-flow flame retardant is weighed and added to the mixture A and mixed evenly to obtain a mixture B; the mixture B is melt-extruded, cooled, granulated, and dried to obtain a high-flow halogen-free flame retardant PC / ABS material.

[0026] By adopting the above technical solution, the flame retardant compound, polydimethylsiloxane derivative, and compatible plasticizer are first mixed into a high-flow flame retardant, which is then mixed with PC, ABS, and processing aids and then subjected to melt extrusion, cooling, granulation, drying and other processes to obtain a high-flow halogen-free flame retardant PC / ABS material. This allows the raw materials to be fully mixed to exert a synergistic effect, thereby obtaining a PC / ABS material with a flame retardancy grade of V0, excellent fluidity and mechanical properties, good thermal stability, and suitability for precision injection molding, and a high product qualification rate when used for precision parts processing.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The boron-modified phenolic resin and caged polysilsesquioxane in the flame retardant compound have a synergistic flame retardant effect, and also have a synergistic effect with polydimethylsiloxane derivatives, bringing the flame retardancy of high-flow halogen-free flame-retardant PC / ABS materials to VO grade. 2. The compatible plasticizer has a toughening effect on the entire raw material system, and synergistically compatibility and dispersed flow with polydimethylsiloxane derivatives, improving the compatibility between the flame retardant compound, PC, and ABS, giving the material better flowability and toughness during processing, and the final product qualification rate is as high as over 95%. 3. Cage-type polysilsesquioxane materials and polydimethylsiloxane derivatives can form an inorganic oxygen-isolating and heat-insulating protective layer, improve the flame retardancy of the material, and optimize processing fluidity and enhance mechanical properties. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the embodiments.

[0029] Some sources of raw materials: The number average molecular weight of PC and ABS is 100,000-500,000; Boron-modified phenolic resin brand: Yihuiyang, model: YHY, solid content: 99%; The brand model of maleic anhydride grafted SEBS is Kraton FG1924 from the United States; Hydrogenated terpene resin brand model number Xinghai Chemical T-100XH-028; Polyethylene oxide phosphate CAS number 52503-24-9; The molecular formula of polystyrene-poly(heptamidobutyl cage-type polysilsesquioxane propyl methacrylate) is: [C8H8] n [C4H5O2-(CH2)3-Si8O 12 (C4H9)7]m; purity: ≤100%; Main chain structure: diblock copolymer, main component: POSS cage-type polysilsesquioxane, its n and m are both 300-500; Cage-type polysilsesquioxane-octaepoxy nanosilica dispersion brand Qicaiguan EP4F09.01; The molecular formula of polydimethylsiloxane-polytert-butyl methacrylate is: [C2H6OSi] n [C8H 14 O2] m ; Wherein, n and m are both 10-50; Polyethylene glycol-polydimethylsiloxane-polyethylene glycol Molecular formula: [C2H4O] n [C2H6OSi] m[C2H4O] n ; wherein n is 2-10; m is 10-50; The release agent is PE wax (molecular weight 3000-4000); The anti-UV agent is ultraviolet absorber UV-P; The antioxidant is antioxidant 1010. Example

[0030] Example 1 A high-flow halogen-free flame-retardant PC / ABS material is obtained by the following method: High-flow flame retardant: According to parts by weight, a flame retardant compound, a polydimethylsiloxane derivative, and a compatible plasticizer are weighed and placed in a high-speed mixer at a speed of 300 r / min for 10 minutes to fully mix them. The weight ratio of the flame retardant compound, the polydimethylsiloxane derivative, and the compatible plasticizer is 3:1:6 to obtain a high-flow flame retardant; According to parts by weight, 20 parts of PC, 80 parts of ABS, and 1 part of a processing aid were weighed and placed in a high-speed mixer at a speed of 300 r / min. The mixture was mixed for 10 minutes to obtain a mixture A. Weigh 20 parts of high-flow flame retardant and add it to mixture A, mix it at a speed of 300 r / min for 10 minutes to fully mix it, and obtain mixture B; put mixture B into a twin-screw extruder for melt extrusion, the extruded material enters a water cooling device for cooling, and then enters a granulator for granulation, and then enters a 100°C oven for drying for 10 minutes to obtain a high-flow halogen-free flame retardant PC / ABS material.

[0031] In the above-mentioned invention, the flame retardant compound is composed of a boron-modified phenolic resin and a caged polysilsesquioxane material in a weight ratio of 5:1. The caged polysilsesquioxane material is polystyrene-poly(heptaisobutyl caged polysilsesquioxane propyl methacrylate). The polydimethylsiloxane derivative is polydimethylsiloxane-poly(tert-butyl methacrylate). The compatible plasticizer is composed of maleic anhydride-grafted SEBS and hydrogenated terpene resin in a weight ratio of 8:2. The processing aids are composed of a release agent, a UV inhibitor, and an antioxidant in a weight ratio of 3:1:1.

[0032] Example 2 The difference between Example 2 and Example 1 is that the amounts of raw materials used are different, as follows: According to weight, 37 parts of PC, 63 parts of ABS, 14 parts of high flow flame retardant, 2.5 parts processing aid.

[0033] The high-flow flame retardant consists of a flame retardant compound, a polydimethylsiloxane derivative and a compatible plasticizer in a weight ratio of 4:1:5.

[0034] The flame retardant compound consists of boron-modified phenolic resin and cage-type polysilsesquioxane material in a weight ratio of 5:2.5.

[0035] Example 3 The difference between Example 3 and Example 1 is that the amounts of raw materials used are different, as follows: By weight, 50 parts of PC, 50 parts of ABS, 10 parts of high flow flame retardant, and 5 parts of processing aid.

[0036] The high-flow flame retardant consists of a flame retardant compound, a polydimethylsiloxane derivative and a compatible plasticizer in a weight ratio of 5:1:4.

[0037] The flame retardant compound is composed of boron-modified phenolic resin and cage-type polysilsesquioxane material in a weight ratio of 5:3.

[0038] Example 4 The difference between Example 4 and Example 2 is that the cage-type polysilsesquioxane material is a cage-type polysilsesquioxane-octaepoxy nano-silica dispersion.

[0039] Example 5 The difference between Example 5 and Example 2 is that the caged polysilsesquioxane material is composed of polystyrene-poly(heptaisobutyl caged polysilsesquioxane propyl-methacrylate) and caged polysilsesquioxane-octaepoxy nano-silica dispersion in a weight ratio of 1:2.

[0040] Example 6 The difference between Example 6 and Example 2 is that the polydimethylsiloxane derivative is polyethylene glycol-polydimethylsiloxane-polyethylene glycol.

[0041] Example 7 The difference between Example 7 and Example 2 is that the polydimethylsiloxane derivative consists of polydimethylsiloxane-polytert-butyl methacrylate and polyethylene glycol-polydimethylsiloxane-polyethylene glycol in a weight ratio of 1:1.

[0042] Example 8 The difference between Example 8 and Example 5 is that the polydimethylsiloxane derivative consists of polydimethylsiloxane-polytert-butyl methacrylate and polyethylene glycol-polydimethylsiloxane-polyethylene glycol in a weight ratio of 8:2.

[0043] Example 9 The difference between Example 9 and Example 2 is that the compatible plasticizer is maleic anhydride grafted SEBS and polyethylene oxide phosphate in a weight ratio of 8:2.

[0044] Example 10 The difference between Example 10 and Example 2 is that the compatible plasticizer consists of maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate in a weight ratio of 8:0.7:1.3.

[0045] Example 11 The difference between Example 11 and Example 5 is that the compatible plasticizer consists of maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate in a weight ratio of 8:0.7:1.3.

[0046] Example 12 The difference between Example 12 and Example 2 is that the compatible plasticizer consists of maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate in a weight ratio of 8:0.7:1.3.

[0047] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that the flame retardant compound is replaced by magnesium hydroxide (particle size 500 mesh) in equal amount.

[0048] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the polydimethylsiloxane derivative is replaced by an equal amount of a compatible plasticizer.

[0049] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that the compatible plasticizer is replaced by maleic anhydride grafted ABS (Mitsui Chemicals GT7, Japan) in equal amount.

[0050] Comparative Example 4 The difference between Comparative Example 4 and Example 2 is that the flame retardant compound is a boron-modified phenolic resin.

[0051] Performance testing The high-flow, halogen-free, flame-retardant PC / ABS materials obtained in Examples 1-12 and Comparative Examples 1-4 were dried at 100°C for 2 hours and then transferred to an injection molding machine for injection molding. The following injection molding parameters were used: barrel temperature (typically controlled between 230°C and 300°C); mold temperature (80°C); injection speed (a moderate injection speed helps reduce bubbles and weld marks); injection pressure (105 MPa); dwell time (10 seconds); cooling time (30 seconds); and annealing treatment (125°C for 40 minutes). The materials were then cooled to 30°C to produce the mobile phone card slots and samples used in the following experiments.

[0052] Detection method / test method The size of the nano SIM card slot of the mobile phone in this application is 12.3mm*8.8mm*0.67mm.

[0053] 1) Product qualification rate For each experimental sample, 200 mobile phone card slots were subjected to surface treatments such as spraying and electroplating. They were then subjected to quality inspection, including dimensional measurement, appearance inspection, and performance testing. Products were considered acceptable if the dimensional measurement was within 0.01mm of the preset value, and the pass rate was calculated.

[0054] 1. Liquidity The experimental samples used to test fluidity were tested for melt index according to ASTM D1238; 3) Flame retardant grade The test was conducted with reference to the UL94 combustion standard, and the thickness of the test sample was 1.5mm; 4) Impact toughness The test was carried out according to ASTM D256, with a 2 mm V-notch, a temperature of 25°C, and a test specimen thickness of 3.2 mm.

[0055] The above experimental data are shown in Table 1. Table 1 Experimental data of Examples 1-12 and Comparative Examples 1-4 Combining Example 2 and Comparative Examples 1-3 and Table 1, it can be seen that the qualified rate of Example 2 is above 95%, and the qualified rates of Comparative Examples 1-3 are all below 90%; the flame retardant grade of Example 2 reaches the VO level, and the flame retardant grade of Comparative Examples 2-3 is only V1 level. In addition, the notched impact toughness and melt index of Comparative Examples 1-3 are lower than those of Example 2, indicating that the high flow flame retardant of the present application is composed of a flame retardant compound (the flame retardant compound is a boron-modified phenolic resin and a cage-type polysilsesquioxane material), a polydimethylsiloxane derivative, and a compatible plasticizer (the compatible plasticizer is a combination of a variety of maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate); its compounding has a synergistic effect on PC / ABS material, can further improve the flowability and mechanical properties of high-flow halogen-free flame retardant PC / ABS material, facilitates the processing of high-precision products, and can ensure dimensional stability after processing to obtain uniform quality specifications of products.

[0056] Combining Example 2 and Comparative Example 4 with Table 1, it can be seen that the flame retardant grade of Example 2 reaches V0 level, and the notched impact strength is as high as 87.2 J / m, while the flame retardant grade of Comparative Example 4 is only V2, and the notched impact strength is as high as 76.2 J / m, which is significantly lower than Example 2. This shows that the flame retardant compound is compounded by boron-modified phenolic resin and cage-type polysilsesquioxane material, which plays a synergistic role and can make the high-flow halogen-free flame retardant PC / ABS material have better comprehensive performance.

[0057] By comparing Example 2 with Examples 4-5 and combining them with Table 1, it can be seen that the cage-type polysilsesquioxane material is compounded by polystyrene-poly (heptaisobutyl cage-type polysilsesquioxane propyl-methacrylate) and cage-type polysilsesquioxane-octaepoxy nano-silica dispersion, which plays a synergistic role, thereby enabling the high-flow halogen-free flame retardant PC / ABS material to obtain better comprehensive properties.

[0058] Comparing Examples 5 and 8, it can be seen that when Example 8 uses polydimethylsiloxane-polytert-butyl methacrylate and polyethylene glycol-polydimethylsiloxane-polyethylene glycol in a compound, the product qualification rate reaches 100%, the melt index increases to 36.4 g / 10 min, and the notched impact strength increases to 91.7 J / m. This demonstrates that the two compoundings work synergistically, promoting the dispersion and compatibility of the flame retardant compounds within the raw material system and further improving the overall performance of the high-flow halogen-free flame-retardant PC / ABS material, making it easier to injection mold small, precise, and high-precision electronic product components, thereby improving their quality and qualification rate.

[0059] Comparing Examples 2, 5, 8, and 11, it can be seen that Example 11 reaches the highest in terms of melt index, notched impact strength, etc., indicating that the use of a compatible plasticizer composed of maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate in a weight ratio of 8:0.7:1.3 not only has a better synergistic effect, but also can be combined with a polydimethylsiloxane derivative (composed of polydimethylsiloxane-polytert-butyl methacrylate and polyethylene glycol-polydimethylsiloxane-polyethylene glycol), a flame retardant compound composed of a boron-modified phenolic resin and a cage-type polysilsesquioxane material (cage-type polysilsesquioxane material composed of polystyrene-poly (heptaisobutyl cage-type polysilsesquioxane propyl-methacrylate) and a cage-type polysilsesquioxane-octaepoxy nanosilica dispersion), which plays a synergistic role, further improving the comprehensive performance of the high-flow halogen-free flame retardant PC / ABS material, so that it can be used in the production of precision electronic products. It can be beneficial to injection molding to form products with precise dimensions and ensure the qualified rate of product production.

[0060] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-flow halogen-free flame-retardant PC / ABS material, characterized in that: It is composed of the following raw materials in parts by weight: PC: 20-50 copies ABS: 50-80 copies High flow flame retardant: 10-20 parts Processing aids: 1-5 parts; The high-flow flame retardant is composed of a flame retardant compound, a polydimethylsiloxane derivative, and a compatible plasticizer; The flame retardant compound is composed of boron-modified phenolic resin and cage-type polysilsesquioxane material; The compatible plasticizer is a combination of multiple types selected from maleic anhydride grafted SEBS, hydrogenated terpene resin, and polyethylene oxide phosphate, at least one of which is maleic anhydride grafted SEBS.

2. The high-flow halogen-free flame-retardant PC / ABS material according to claim 1, characterized in that: The weight ratio of the flame retardant compound, the polydimethylsiloxane derivative and the compatible plasticizer is (3-5):1:(4-6).

3. The high-flow halogen-free flame-retardant PC / ABS material according to claim 1, characterized in that: The weight ratio of the boron-modified phenolic resin to the cage-type polysilsesquioxane material is 5:(2-3).

4. The high-flow halogen-free flame-retardant PC / ABS material according to claim 1, characterized in that: The cage-type polysilsesquioxane material is polystyrene-poly(heptaisobutyl cage-type polysilsesquioxane propyl-methacrylate) and / or cage-type polysilsesquioxane-octaepoxy nano-silica dispersion.

5. The high-flow halogen-free flame-retardant PC / ABS material according to claim 4, characterized in that: The cage-type polysilsesquioxane material consists of polystyrene-poly(heptaisobutyl cage-type polysilsesquioxane propyl-methacrylate) and cage-type polysilsesquioxane-octaepoxy nano-silica dispersion.

6. The high-flow halogen-free flame-retardant PC / ABS material according to claim 1, characterized in that: The polydimethylsiloxane derivative is polydimethylsiloxane-polytert-butyl methacrylate and / or polyethylene glycol-polydimethylsiloxane-polyethylene glycol.

7. The high-flow halogen-free flame-retardant PC / ABS material according to claim 1, characterized in that: The compatible plasticizer consists of maleic anhydride grafted SEBS, hydrogenated terpene resin and polyethylene oxide phosphate.

8. The high-flow halogen-free flame-retardant PC / ABS material according to claim 1, characterized in that: The processing aid is composed of one or more of a release agent, stearic acid, a heat stabilizer, an anti-UV agent, an antioxidant, silicon nitride, hexagonal boron nitride, and a colorant.

9. The high-flow halogen-free flame-retardant PC / ABS material according to claim 8, characterized in that: The processing aid consists of a release agent, an anti-UV agent and an antioxidant.

10. A method for preparing a high-flow halogen-free flame-retardant PC / ABS material according to any one of claims 1 to 9, characterized in that: The following steps are involved: High flow flame retardant: According to parts by weight, weigh the flame retardant compound, polydimethylsiloxane derivative, and compatible plasticizer and mix them evenly to obtain a high flow flame retardant; According to parts by weight, PC, ABS, and processing aid were weighed and mixed evenly to obtain a mixture A; A high-flow flame retardant is weighed and added to the mixture A and mixed evenly to obtain a mixture B; the mixture B is melt-extruded, cooled, granulated, and dried to obtain a high-flow halogen-free flame retardant PC / ABS material.

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