PC / ABS alloy material as well as preparation method and application thereof

Abstract

The invention discloses a PC / ABS alloy material as well as a preparation method and application thereof, and belongs to the field of high polymer materials. According to the PC / ABS alloy material, the phosphorus-nitrogen flame retardant serves as a main flame retardant, meanwhile, the silicon flame retardant synergist is compounded to synergistically improve the flame retardance of the alloy material, and the silicon flame retardant synergist and the silicon copolymerized polycarbonate are utilized to synergistically improve the flame retardance, toughness and demolding performance of the alloy material, so that the PC / ABS alloy material has excellent flame retardance, toughness and demolding performance; the method is suitable for preparing plastic parts in financial equipment, consumer electronics or household appliances, and even thin-walled plastic parts.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, and in particular to a PC / ABS alloy material and a preparation method and application thereof. Background Art

[0002] Flame-retardant PC / ABS alloys are widely used in the electronics and electrical appliance fields. A growing number of scientific studies have confirmed the serious hazards of PFAS (per- and polyfluoroalkyl substances). However, the flame retardancy of PC / ABS alloys is currently highly dependent on fluorides. Although PC resin itself has a certain degree of self-extinguishing properties, reducing the amount of fluoride added will cause drip failure. Especially after adding ABS, drip failure will be exacerbated, making it impossible to achieve thin-wall flame retardancy V0 or V1 grades (for example, wall thickness below 2.0mm), let alone without any fluoride addition. This greatly limits the application of the material, especially with the development trend of miniaturization, thin-walling, and environmentally friendly electronic components. Therefore, it is necessary to develop a technology that can make PC / ABS alloys have excellent flame retardancy, toughness, and processability, suitable for the preparation of thin-wall products. Summary of the Invention

[0003] Based on the defects of the existing technology, the purpose of this application is to provide a PC / ABS alloy material and its preparation method and application. The obtained PC / ABS alloy material has excellent flame retardancy, toughness and demolding properties, and is suitable for the preparation of plastic parts, even thin-walled plastic parts.

[0004] In order to achieve the above objectives, in a first aspect, the present application provides a PC / ABS alloy material comprising the following components in parts by weight:

[0005]

[0006] The silicon-based flame retardant synergist includes fast-migrating silicone, slow-migrating silicone and inorganic silicone, wherein the mobility of the fast-migrating silicone is above 50%, the mobility of the slow-migrating silicone is below 5%, and the inorganic silicone includes at least one of silicon dioxide and silicate substances.

[0007] The PC / ABS alloy material utilizes a phosphorus-nitrogen flame retardant as the primary flame retardant, along with a silicon-based flame retardant synergist to synergistically improve the alloy's flame retardancy. The phosphorus-nitrogen flame retardant exhibits a highly effective dual-phase flame retardancy mechanism. Its phosphorus component generates acidic substances such as polyphosphoric acid, promoting dehydration and carbonization of the material and ensuring sufficient condensed-phase flame retardancy. Simultaneously, its nitrogen component generates non-combustible gases (such as NH3 and / or N2), which dilute oxygen and combustible gases. This synergistic effect significantly improves the quality of the char layer and flame retardancy, while reducing the amount of flame retardant added. Among the silicon-based flame retardant synergists, fast-migrating silicones rapidly migrate to the alloy surface during combustion and accumulate there, providing thermal insulation. Slow-migrating silicones migrate more slowly during combustion, primarily distributing themselves within the material. This increases fluid viscosity during combustion and reduces the risk of drip failure. Specific types of inorganic silicones act as stress dispersants, reinforcing the combustion char layer and improving flame retardancy stability. Furthermore, the silicon-based flame retardant synergist enhances the alloy's toughness and fluid stability, facilitating demolding and optimizing processing performance.

[0008] Silicon copolymer polycarbonate has the characteristics of high fluidity, low stress, and low adhesion to metal molds. During the combustion process, its silicon element can be thermally decomposed to generate SiO2 particles and siloxane oligomers, which capture free radicals in the gas phase. The released Si(CH3)3 and other groups can further interfere with the combustion reaction and can cooperate with silicon-based flame retardant synergists to improve demolding properties and toughness. However, excessive addition of silicon copolymer polycarbonate will cause the alloy material to have excessive fluidity and easily cause dripping failure. In addition, since PDMS (i.e. polydimethylsiloxane) itself is self-igniting, the burning time is too long. At the same time, the compatibility with the PC matrix is ​​deteriorated, and obvious interface defects appear, resulting in a significant reduction in impact strength and failure to achieve effective toughening.

[0009] The above-mentioned PC / ABS alloy material has excellent flame retardancy, toughness and demoulding properties under the synergistic effect of appropriate contents of each component, and can achieve thin-wall flame retardancy (such as thickness below 2mm, and thickness below 1.5mm), and is suitable for the preparation of electronic components.

[0010] The silicon copolymer polycarbonate is 18 to 112 parts by weight, such as 18 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 40 parts by weight, 50 parts by weight, 60 parts by weight, 70 parts by weight, 80 parts by weight, 90 parts by weight, 100 parts by weight, 110 parts by weight, 112 parts by weight or an interval formed by any two of the above.

[0011] The ABS is 3 to 19 parts by weight, such as 3 parts by weight, 5 parts by weight, 8 parts by weight, 10 parts by weight, 12 parts by weight, 15 parts by weight, 17 parts by weight, 19 parts by weight or any two parts thereof.

[0012] The phosphorus-nitrogen flame retardant is present in an amount of 10 to 37 parts by weight, such as 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 37 parts by weight, or any two parts thereof.

[0013] The silicon-based flame retardant synergist is present in an amount of 5 to 50 parts by weight, such as 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, or any two parts thereof.

[0014] The mass proportion of the polycarbonate in the PC / ABS alloy material is greater than 35%, such as 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% or a range formed by any two of the above.

[0015] The mobility of the fast-moving silicone is above 50%, such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or any two thereof. In some embodiments, the mobility of the fast-moving silicone is 53% to 88%.

[0016] The mobility of the slow-migrating silicone is below 5%, such as 5%, 4.5%, 4%, 3.5%, 3%, 2.5%, 2%, 1.5%, 1% or any two of the above. In some embodiments, the mobility of the slow-migrating silicone is 1% to 4%. The mobility of the fast-migrating silicone and the mobility of the slow-migrating silicone are measured as follows:

[0017] Organic silicon and PC (PC2100, Wanhua Chemical) were mixed and dispersed, melt-extruded in a twin-screw extruder, and granulated to obtain a PC composite material with a 5% organic silicon content by mass;

[0018] The obtained PC composite material was injection molded at 260°C into strips with a length of 60 mm, a width of 60 mm, and a thickness of 2.0 mm;

[0019] The obtained specimens were placed in an oven (IAT-216, Jufu Instruments) at 150°C for 8 h, and the surface silicon content was measured by EDS (energy dispersive X-ray spectroscopy), and the mobility μ of the silicone was calculated by the following formula:

[0020] μ = 100 × (surface silicon content after being placed at 150°C for 8 hours / silicon content in the entire specimen).

[0021] In some embodiments, the mass ratio of the slow migration silicone, the fast migration silicone and the inorganic silicon is 1:(0.08-0.92):(0.08-0.92), for example, 1:0.08:0.92, 1:0.08:0.8, 1:0.08:0.6, 1:0.08:0.4, 1:0.08:0.2, 1:0.08:0.08, 1:0.2:0.92, 1:0.2:0.8, 1:0.2:0.6, 1:0.2:0.4, 1:0.2:0.2, 1:0.2:0.08, 1:0.4:0.92, 1:0.4:0.8, 1:0.4:0.6, 1:0.4:0 .4, 1:0.4:0.2, 1:0.4:0.08, 1:0.6:0.92, 1:0.6:0.8, 1:0.6:0.6, 1:0.6:0.4, 1:0.6:0.2, 1:0.6:0.08, 1:0.8:0.92, 1:0.8:0.8, 1:0.8:0.6, 1:0.8:0.4, 1:0.8:0.2, 1:0.8:0.08, 1:0.92:0.92, 1:0.92:0.8, 1:0.92:0.6, 1:0.92:0.4, 1:0.92:0.2, 1:0.92:0.08 or the interval formed by any two of the above. In one embodiment, the mass ratio of the slow migration silicone, the fast migration silicone and the inorganic silicone is 1:(0.25-0.75):(0.25-0.75).

[0022] When the mass ratio of the slow-migrating silicone, the fast-migrating silicone and the inorganic silicone is within the range of 1:(0.08-0.92):(0.08-0.92), especially within the range of 1:(0.25-0.75):(0.25-0.75), the synergistic effect of the three can be better exerted, which is more conducive to achieving the triple balance of flame retardancy, toughness and demolding properties of the alloy material.

[0023] In some embodiments, the fast-transfer organosilicon includes at least one of methylsiloxane and phenylsiloxane. For example, the methylsiloxane includes octa(trimethylsiloxy)silsesquioxane; and the phenylsiloxane includes at least one of octaphenylsiloxane and diphenyldihydroxysilane.

[0024] In some embodiments, the slow-migration organosilicon comprises a polysiloxane compound, and the polysiloxane compound comprises at least one of polydimethylsiloxane, a polysiloxane block copolymer, and a polysiloxane graft copolymer. Exemplarily, the polysiloxane block copolymer comprises a polysiloxane-acrylate block copolymer, and the polysiloxane graft copolymer comprises a polysiloxane-acrylate graft copolymer or a polysiloxane-SAN graft copolymer (where SAN refers to a styrene-acrylonitrile copolymer).

[0025] In some embodiments, the silicate material includes at least one of talc, wollastonite, aluminum silicate, and mica.

[0026] In some embodiments, the average particle size of the inorganic silicon is 0.01 to 200 μm, such as 0.01 μm, 0.05 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, or any two thereof. Preferably, the average particle size of the inorganic silicon is 0.01 to 20 μm.

[0027] The average particle size of the inorganic silicon is measured by a laser particle size analyzer, and the Dv50 of the obtained particles is the average particle size.

[0028] In some embodiments, the phosphorus-nitrogen flame retardant includes at least one of phosphazene, phosphaphenanthrene, melamine polyphosphate, and ammonium polyphosphate.

[0029] In some embodiments, the weight percentage of siloxane in the silicon co-polycarbonate is 5% to 22%, for example, 5%, 7%, 10%, 12%, 15%, 18%, 20%, 22%, or any two thereof. In one embodiment, the weight percentage of siloxane in the silicon co-polycarbonate is 6% to 10%.

[0030] When the mass percentage of siloxane in the silicon copolymer polycarbonate is within the range of 5% to 22%, especially within the range of 6% to 10%, it has better compatibility with the polycarbonate resin matrix, can provide sufficient matrix toughness, and can also improve flame retardancy.

[0031] The mass percentage of siloxane in the silicon copolymer polycarbonate is determined by 29 The results were detected by Si NMR method.

[0032] In some embodiments, the weight average molecular weight of the silicon copolymer polycarbonate is 30,000 to 60,000, such as 30,000, 35,000, 40,000, 45,000, 50,000, 55,000, 60,000, or any two thereof.

[0033] The weight average molecular weight of the silicon copolymer polycarbonate is measured by gel permeation chromatography using polystyrene as a standard.

[0034] The silicon co-polycarbonate can be prepared either in-house or commercially available. In some embodiments, the method for preparing the silicon co-polycarbonate comprises the following steps:

[0035] ① At 20-30° C. and 25-80 rpm, a bisphenol A (BPA) alkaline aqueous solution (50-200 g / min, wherein the bisphenol A concentration is 8 wt.% to 12 wt.%, and the alkali concentration is 1 wt.% to 10 wt.%), phosgene (5-20 g / min), dichloromethane (50-200 g / min), and a 32 wt.% inorganic alkali aqueous solution (1-7 g / min) are continuously introduced into a reaction vessel and stirred for 0.5-3 h to obtain a primary reaction product;

[0036] ② At 20-30°C and 25-80 rpm, a 20 wt.% dichloromethane solution of siloxane PDMS was continuously added (50-200 g / min) and phosgene (1 g / min) to the reaction vessel for premixing. The addition time was 3-30 hours.

[0037] ③ At 20-30° C. and 25-80 rpm, triethylamine was continuously added to the reaction vessel at a rate of 0.03 g / min, a 30% aqueous solution of an inorganic base was added at a rate of 4 g / min, and a phenolic substance was added at a rate of 0.5 g / min to perform an end-capping reaction. The end-capping reaction time was 0.5-4 h. After the reaction was completed, the aqueous phase was removed to obtain a polysiloxane-polycarbonate copolymer glue;

[0038] ④ Wash with an inorganic alkali aqueous solution of 0.3% to 0.8% by mass and an acid solution of 0.2 to 0.6 mol / L in sequence, and then wash with pure water until the aqueous phase conductivity is below 0.01 μS / m. Concentrate, precipitate, crush, and dry the washed copolymer glue to obtain copolymer powder, namely, silicon copolymer polycarbonate.

[0039] Among them, the phenolic substance can be selected from at least one of p-tert-butylphenol and phenol; in the alkaline aqueous solution of bisphenol A (BPA) used in step ①, the base can be selected from at least one of NaOH, KOH, etc.; in steps ①, ③ and ④, the inorganic base in the inorganic alkaline aqueous solution used can each independently be selected from at least one of NaOH, KOH, etc.; in step ④, the acid in the acid solution used can be selected from at least one of hydrochloric acid, sulfuric acid, phosphoric acid, etc.

[0040] In some embodiments, the weight average molecular weight of the polycarbonate is 25,000 to 82,000, such as 25,000, 30,000, 40,000, 50,000, 60,000, 70,000, 82,000, or any two thereof.

[0041] The weight average molecular weight of the polycarbonate is measured by gel permeation chromatography using polystyrene as a standard.

[0042] In some embodiments, the polycarbonate includes at least one of phosgene-processed polycarbonate, transesterification-processed polycarbonate, and the like.

[0043] In some embodiments, the ABS comprises bulk ABS.

[0044] In some embodiments, the weight average molecular weight of the ABS is 50,000 to 200,000, such as 50,000, 70,000, 100,000, 120,000, 150,000, 180,000, 200,000, or any two of the above.

[0045] The weight average molecular weight of the ABS is measured by gel permeation chromatography using polystyrene as a standard.

[0046] As needed, at least one of an antioxidant, a heat stabilizer, a lubricant, and a colorant may be added to the PC / ABS alloy material, but the present invention is not limited thereto.

[0047] Exemplarily, the antioxidant includes at least one of a hindered phenol antioxidant, a phosphite antioxidant, etc. The antioxidant can be selected from 0 to 0.5 parts by weight, such as 0.01 parts by weight, 0.05 parts by weight, 0.1 parts by weight, 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight or 0.5 parts by weight.

[0048] Exemplarily, the heat stabilizer includes at least one of a phenolic heat stabilizer, a phosphite heat stabilizer, and a thioester heat stabilizer. The heat stabilizer can be selected from 0 to 0.5 parts by weight, such as 0.1 parts by weight, 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight, or 0.5 parts by weight.

[0049] Exemplarily, the lubricant includes at least one of ethylene bisstearamide, silane polymer, stearate, stearic acid, fatty acid salt, fatty acid amide, polyethylene wax, etc. The lubricant can be selected from 0 to 1 part by weight, such as 0.2 part by weight, 0.3 part by weight, 0.4 part by weight, 0.5 part by weight, 0.6 part by weight, 0.7 part by weight, 0.8 part by weight, 0.9 part by weight, or 1 part by weight.

[0050] Illustratively, the color powder may be selected to be 0 to 2.5 parts by weight, such as 0.1 parts by weight, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, or 2.5 parts by weight.

[0051] In a second aspect, the present application provides a method for preparing a PC / ABS alloy material, comprising the following steps: mixing and dispersing the raw materials of each component, melt-extruding, and granulating to obtain a PC / ABS alloy material.

[0052] In some embodiments, the melt extrusion is performed in a screw extruder, such as a twin-screw extruder.

[0053] Preferably, the temperature zones of the screw extruder are set as follows:

[0054] Zone 1: 230-260°C, Zone 2: 240-270°C, Zone 3: 245-290°C, Zone 4: 250-300°C, Zone 5: 250-300°C, Zone 6: 250-300°C, Zone 7: 250-300°C, Zone 8: 250-300°C, Zone 9: 250-280°C, Zone 10: 260-300°C, screw speed: 200-800rpm, screw aspect ratio: (30-60):1.

[0055] In a third aspect, the present application provides a plastic component comprising the PC / ABS alloy material.

[0056] In some embodiments, the thickness of the plastic component is less than 2.0 mm.

[0057] In one embodiment, the thickness of the plastic component is 1.5 to 0.8 mm.

[0058] The PC / ABS alloy material is suitable for preparing financial equipment components, consumer electronic components, household appliance components, etc., especially thin-walled plastic components with a thickness of less than 2.0 mm (e.g., 1.5-0.8 mm) in these products, such as the housings of financial equipment such as handheld POSS machines and bank ATMs, the housings of consumer electronics such as portable headphones and speakers, and the housings of household appliances such as film and television equipment.

[0059] In a fourth aspect, the present application provides applications of the PC / ABS alloy material in financial equipment, consumer electronics or household appliances.

[0060] Compared with the prior art, the present invention has the following advantages:

[0061] (1) The PC / ABS alloy material of the present application uses a phosphorus-nitrogen flame retardant as the main flame retardant, and is compounded with a silicon-based flame retardant synergist to synergistically improve the flame retardancy of the alloy material. The silicon-based flame retardant synergist is further used with silicon copolymerized polycarbonate to synergistically improve the flame retardancy, toughness and demolding properties of the alloy material.

[0062] (2) The PC / ABS alloy material of the present application has excellent flame retardancy, toughness and demolding properties under the synergistic effect of the appropriate contents of each component, and can achieve thin-wall flame retardancy (such as a thickness of less than 2.0 mm, or even less than 1.5 mm), and is suitable for preparing plastic parts in financial equipment, consumer electronics or household appliances, and even thin-walled plastic parts. DETAILED DESCRIPTION

[0063] In order to better illustrate the purpose, technical solutions and advantages of the present application, the present application will be further described below in conjunction with specific embodiments and comparative examples. Its purpose is to understand the content of the present application in detail, rather than to limit the present application. All other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present application. The experimental reagents and instruments involved in the implementation of this application are all commonly used ordinary reagents and instruments unless otherwise specified. In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions comprising the listed features.

[0064] The raw materials used in the following examples and comparative examples are as follows. Unless otherwise specified, they are all commercially available raw materials. In addition, the components and raw materials used in each parallel experiment are the same:

[0065] Slow migration silicone 1: mobility 1.5%, polysiloxane-acrylate block copolymer, MR01, Kaneka Chemical, Japan;

[0066] Slow migration silicone 2: mobility 2.3%, polysiloxane-acrylate graft copolymer, SX005, Mitsubishi Chemical Engineering;

[0067] Slow migration silicone 3: mobility 3.7%, polydimethylsiloxane, SR600, Yinyuan New Materials;

[0068] Slow migration silicone 4: mobility 1.0%, polysiloxane-SAN grafted compound, SX006, Mitsubishi Liyang;

[0069] Fast-migrating silicone 1: mobility 53.7%, octaphenylsiloxane, purity 98%, CAS: 546-56-5, Beijing Bailingwei Technology;

[0070] Fast-migrating silicone 2: mobility 78.9%, diphenyldihydroxysilane, purity 98%, CAS: 947-42-2, manufacturer Jinan Yunuo Chemical;

[0071] Fast-migrating silicone 3: mobility 86.1%, octa(trimethylsiloxy)silsesquioxane, purity 98%, CAS: 51777-38-9, Xi'an Qiyue Biological;

[0072] Inorganic silicon 1: silicon dioxide, average particle size 20 nm, model G010-M, Jiashan Shenjia Technology;

[0073] Inorganic silicon 2: talc, average particle size 1200 nm, model AT-0026, Gaide Chemical;

[0074] Inorganic silicon 3: talc, average particle size 800 nm, model HTP Ultra 5L, Italy, France and Germany;

[0075] Inorganic silicon 4: wollastonite, average particle size 10 μm, model WFA50, Hubei Fengjiashan Silica Fiber;

[0076] Inorganic silicon 5: silicon nitride, average particle size 2 μm, type silicon nitride α phase, J&K Technology;

[0077] Polycarbonate 1: phosgene method, weight average molecular weight 38,000, PC2100, Wanhua Chemical;

[0078] Polycarbonate 2: transesterification method, weight average molecular weight 36,000, model WY-106WR, manufacturer Lihuayi;

[0079] Silicone copolymer polycarbonate 1: The mass percentage of siloxane is 9%, the weight average molecular weight is 41,000, and the preparation method is as follows:

[0080] ① At 26° C. and 35 rpm, an alkaline aqueous solution of bisphenol A (BPA) (flow rate 143 g / min, wherein the bisphenol A concentration is 12.5 wt.%, the alkali concentration is 6 wt.%, and the alkali is sodium hydroxide), phosgene (flow rate 11.2 g / min), dichloromethane (flow rate 127 g / min), and a 32 wt.% NaOH aqueous solution (flow rate 4 g / min) were continuously introduced into the reactor and stirred for 1.5 h to obtain a primary reaction product;

[0081] ② Continuously add 10.5 wt.% PDMS (i.e., polydimethylsiloxane) dichloromethane solution (flow rate 20 g / min) and phosgene (1 g / min) to the above reactor at 26°C and 35 rpm for 1 h;

[0082] ③ At 26° C. and 35 rpm, triethylamine was continuously added at a rate of 0.03 g / min, a 30% mass fraction NaOH aqueous solution was added at a rate of 4 g / min, and p-tert-butylphenol was added at a rate of 0.5 g / min to perform an end-capping reaction. The end-capping reaction time was 3 h. After the reaction was completed, the aqueous phase was removed to obtain a polysiloxane-polycarbonate copolymer glue;

[0083] ④ The polysiloxane-polycarbonate copolymer glue was washed with a 0.5% mass fraction NaOH aqueous solution and a 0.4 mol / L acid solution, and then washed with pure water until the aqueous phase conductivity was below 0.01 μS / m. The washed copolymer glue was concentrated, precipitated, crushed, and dried at 140°C for 6 hours to obtain copolymer powder, namely, silicon copolymer polycarbonate.

[0084] Silicone co-polycarbonate 2: The mass percentage of siloxane is 6%, and the weight-average molecular weight is 38,000. Its preparation method differs from that of silicon co-polycarbonate 1 in that the concentration of the dichloromethane solution added to PDMS in step ② is 6.5 wt.%, and the flow rate is 30 g / min.

[0085] Silicone co-polycarbonate 3: The mass percentage of siloxane is 20%, and the weight-average molecular weight is 32,000. The preparation method thereof differs from that of silicon co-polycarbonate 1 in that the concentration of the PDMS dichloromethane solution added in step ② is 25 wt % and the flow rate is 10 g / min.

[0086] ABS1: weight average molecular weight 150,000, model ABS275, Gaoqiao Petrochemical;

[0087] ABS2: weight average molecular weight 98,000, model ABS 8391, Gaoqiao Petrochemical;

[0088] Phosphorus-nitrogen flame retardant 1: phosphazene, HPCTP, Zhejiang Wansheng;

[0089] Phosphorus-nitrogen flame retardant 2: phosphaphenanthrene, DiDOPO-B, Shandong Weidong Chemical;

[0090] Additive: β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, commercially available.

[0091] The test methods for the mobility of the slow migration silicone and the fast migration silicone are the same as above.

[0092] The testing methods for the siloxane mass percentage and weight average molecular weight of the silicon copolymer polycarbonate are the same as above.

[0093] The following examples and comparative examples each provide a PC / ABS alloy material, the specific composition of which is shown in Table 2 or Table 3. The preparation method thereof comprises the following steps:

[0094] The raw materials of each component were mixed and dispersed, melted and extruded in a twin-screw extruder, and granulated to obtain a PC / ABS alloy material. The length-to-diameter ratio of the twin-screw extruder was 52:1, the speed was 350 rpm, and the temperature of each zone was as follows:

[0095] Zone 1 230℃, Zone 2 240℃, Zone 3 250℃, Zone 4 260℃, Zone 5 265℃, Zone 6 265℃, Zone 7 270℃, Zone 8 270℃, Zone 9 275℃, Zone 10 280℃;

[0096] The composition information of each silicon-based flame retardant synergist is shown in Table 1.

[0097] Table 1

[0098]

[0099]

[0100] Table 2

[0101]

[0102]

[0103] Table 3

[0104] Components / parts by weight Example 19 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 PC 1 100 100 100 100 100 100 100 100 Silicone copolymer PC 1 36.4 36.4 36.4 36.4 36.4 36.4 10 160 ABS1 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 Phosphorus nitrogen flame retardant 1 22.7 22.7 22.7 22.7 22.7 22.7 22.7 22.7 Silicone flame retardant synergist 1 25 25 Silicone flame retardant synergist 13 25 Silicone flame retardant synergist 14 25 Silicone flame retardant synergist 15 25 Silicone flame retardant synergist 16 25 Silicone flame retardant synergist 17 25 Silicone flame retardant synergist 18 25 additives 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9

[0105] The performance of the above-mentioned embodiment and comparative example PC / ABS alloy materials was tested as follows:

[0106] 1) Flame Rating: Flammability testing is conducted according to the "Flammability Tests for Plastic Materials, UL94" protocol. The flame rating is determined based on burning rate, extinguishing time, resistance to dripping, and whether the dripping is burning. The test specimens used are 125 mm long, 13 mm wide, and 1.0 mm thick. According to UL94, materials can be classified as HB, V0, V1, V2, 5VA, and / or 5VB.

[0107] 2) Impact strength: 3.0 mm IZOD notched impact strength was tested according to ASTM D256-2010, where the notch is an injection-molded U-shaped notch and the test temperature was 25°C.

[0108] 3) Mold Release: The mold release force was measured using a cylindrical cup mold after a fixed injection temperature of 260°C, a 10-second cooling period, and a 10-second hold period. The molded sample had a wall and base thickness of 2.0 mm, an outer diameter of 5 cm, and a height of 10 cm. The injection speed and pressure were fixed at 55%.

[0109] The test results are shown in Table 4.

[0110] Table 4

[0111] Flame retardant grade Impact strength (J / m) Demolding force (N) Example 1 1.0mm V0 892 8.9 Example 2 1.0mm V0 883 9.0 Example 3 1.0mm V0 792 11.3 Example 4 1.0mm V0 879 9.1 Example 5 1.0mm V0 873 9.8 Example 6 1.0mm V0 813 10.3 Example 7 1.0mm V0 783 11.2 Example 8 1.0mm V0 808 9.9 Example 9 1.0mm V0 754 9.3 Example 10 1.0mm V0 878 9.7 Example 11 1.0mm V0 712 10.2 Example 12 1.0mm V0 752 8.9 Example 13 1.0mm V0 748 10.9 Example 14 1.0mm V0 702 9.3 Example 15 1.0mm V0 697 11.3 Example 16 1.0mm V1 723 10.7 Example 17 1.0mm V1 808 11.1 Example 18 1.0mm V1 785 10.3 Example 19 1.0mm V0 750 9.9 Comparative Example 1 1.0mmV2 723 13.2 Comparative Example 2 1.0mmV2 605 12.1 Comparative Example 3 1.0mmV2 592 12.4 Comparative Example 4 1.0mmHB 782 13.5 Comparative Example 5 1.0mmV2 587 11.3 Comparative Example 6 1.0mmV2 550 23.6 Comparative Example 7 1.0mmHB 432 9.3

[0112] It can be seen from the above data that the PC / ABS alloy materials implemented in this application can achieve a balance of thin-wall flame retardancy, toughness and demolding properties, and have excellent thin-wall flame retardancy, toughness and demolding properties. Among them, if it can reach 1.0mm wall thickness V0 or V1 level, the impact strength is above 690J / m, and the demolding force is below 12.0N.

[0113] It can be seen from Example 1 and Comparative Examples 1 to 4 that the slow-migrating silicone, the fast-migrating silicone and the specific inorganic silicone can synergistically improve the flame retardancy, toughness and mold release properties of the PC / ABS alloy material. Among them, Comparative Examples 1 to 4 lack one or two of the slow-migrating silicone, the fast-migrating silicone and the inorganic silicone, resulting in poor flame retardancy, toughness and mold release properties.

[0114] From the comparison of Examples 1, 9 to 11 and Comparative Example 5, it can be seen that when the inorganic silicon includes at least one of silicon dioxide and silicate substances, the flame retardancy and toughness of the PC / ABS alloy material are better.

[0115] In Comparative Example 6, the flame retardancy, toughness and demolding properties of the PC / ABS alloy material are relatively poor due to the low content of silicon copolymer polycarbonate. In Comparative Example 7, the fluidity of the alloy material is too strong due to the excessive content of silicon copolymer polycarbonate, which easily causes dripping failure. Moreover, since PDMS itself is self-igniting, the burning time of a single piece exceeds 30s. At the same time, due to the deterioration of compatibility with the PC matrix, obvious interface defects appear, resulting in a significant decrease in impact strength and failure to achieve effective toughening.

[0116] From the comparison of Examples 1 and 12 to 15, it can be seen that when the mass ratio of slow-migrating silicone, fast-migrating silicone and inorganic silicone is 1:(0.25-0.75):(0.25-0.75), it is more conducive to achieving the triple balance of flame retardancy, toughness and demolding properties of the alloy material.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A PC / ABS alloy material, characterized in that: The composition comprises the following components in parts by weight: The silicon-based flame retardant synergist includes fast-migrating silicone, slow-migrating silicone and inorganic silicone, wherein the mobility of the fast-migrating silicone is above 50%, the mobility of the slow-migrating silicone is below 5%, and the inorganic silicone includes at least one of silicon dioxide and silicate substances.

2. The PC / ABS alloy material according to claim 1, wherein: The mobility of the fast-migrating organic silicon is 53% to 88%; the mobility of the slow-migrating organic silicon is 1% to 4%.

3. The PC / ABS alloy material according to claim 1, wherein: The mass ratio of the slow migration organic silicon, the fast migration organic silicon and the inorganic silicon is 1:(0.08-0.92):(0.08-0.92).

4. The PC / ABS alloy material according to claim 3, wherein: The mass ratio of the slow migration organic silicon, the fast migration organic silicon and the inorganic silicon is 1:(0.25-0.75):(0.25-0.75).

5. The PC / ABS alloy material according to claim 1, wherein: The fast-transfer silicone comprises at least one of methylsiloxane and phenylsiloxane; and / or, The slow migration organosilicon comprises a polysiloxane compound, wherein the polysiloxane substance comprises at least one of polydimethylsiloxane, a polysiloxane-acrylate block copolymer, a polysiloxane-acrylate graft copolymer, and a polysiloxane-SAN graft copolymer; and / or, The silicate substance includes at least one of talc, wollastonite, aluminum silicate, and mica; and / or, The phosphorus-nitrogen flame retardant includes at least one of phosphazene, phosphaphenanthrene, melamine polyphosphate, and ammonium polyphosphate.

6. The PC / ABS alloy material according to claim 1, wherein: The mass percentage of siloxane in the silicon copolymer polycarbonate is 5% to 22%, and the weight average molecular weight of the silicon copolymer polycarbonate is 30,000 to 60,000.

7. The PC / ABS alloy material according to claim 1, wherein: At least one of the following conditions is met: (1) The weight average molecular weight of the polycarbonate is 25,000 to 82,000; (2) The weight average molecular weight of the ABS is 50,000 to 200,000.

8. The method for preparing the PC / ABS alloy material according to any one of claims 1 to 7, comprising the following steps: The raw materials of various components are mixed and dispersed, melt-extruded, and granulated to obtain PC / ABS alloy material.

9. A plastic component, characterized in that: The PC / ABS alloy material according to any one of claims 1 to 7 is included, and the thickness of the plastic component is preferably below 2.0 mm, more preferably 1.5 to 0.8 mm.

10. Use of the PC / ABS alloy material according to any one of claims 1 to 7 in financial equipment, consumer electronics or household appliances.

Images