AS composition, preparation method and application thereof

Abstract

The present invention relates to an AS composition, its preparation method, and its application. The AS composition comprises the following components: an AS resin, a toughening agent, a PBAT resin, a flame retardant, a flame retardant synergist, a flame retardant filler, and an anti-drip agent. The AS composition of the present invention exhibits a high glow-wire ignition temperature, good toughness, and strength.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and more particularly to an AS composition, a preparation method thereof, and an application thereof. Background Art

[0002] The housings of household appliances such as dishwashers, microwave ovens, dehumidifiers and heaters require materials with good strength, good toughness and a high glow-wire ignition temperature (GWIT).

[0003] Regarding GWIT, the International Electrotechnical Commission standard IEC 60335-1 stipulates that for unattended electrical and electronic equipment, the GWIT of materials within 3mm of, or in direct contact with, conductive parts carrying a current greater than 0.2A must be ≥ 775°C. This standard is one of the most important criteria for electronic products exported to the European market.

[0004] Common materials for household appliance casings include ABS, HIPS, and ABS alloys. ABS and HIPS offer good processing performance and a high cost-performance ratio, but their GWIT is typically only 675-700°C. Among ABS alloys, only PC / ABS alloy has a slightly higher GWIT, typically reaching 725-800°C. However, its fluidity is poor and its cost is high.

[0005] A Chinese patent titled "An ABS composite material and its preparation method" adds halogenated flame retardants and inorganic fillers to ABS to improve the material's GWIT. However, the large amount of halogenated flame retardants and inorganic fillers added will deteriorate the material's toughness, which will have certain limitations on the material's application in household appliance casings.

[0006] Therefore, it is necessary to develop materials with GWIT ≥ 775°C and good toughness and strength to meet their application in scenarios such as household appliance casings. Summary of the Invention

[0007] The primary purpose of the present invention is to overcome the above-mentioned problems that the GWIT of existing materials cannot reach a good level and have poor mechanical properties, and to provide an AS composition.

[0008] A further object of the present invention is to provide a method for preparing the above-mentioned AS composition.

[0009] A further object of the present invention is to provide use of the above-mentioned AS composition in the preparation of household items, electronic components, household appliances, gardening equipment, medical technology equipment, motor vehicle components or body parts.

[0010] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0011] An AS composition comprising the following components in parts by weight:

[0012] AS resin (styrene-acrylonitrile copolymer) 20~50 parts,

[0013] 6~10 parts of styrene elastomer,

[0014] 12~20 parts of chlorinated polyethylene,

[0015] PBAT resin (polybutylene adipate / terephthalate) 4-21 parts,

[0016] 6~15 parts of flame retardant,

[0017] 2~5 parts of flame retardant synergist,

[0018] 10~18 parts of flame retardant filler,

[0019] 0.5~2 parts of anti-dripping agent;

[0020] The intrinsic viscosity of the PBAT resin is 1.85~2.85 dl / g.

[0021] The addition of flame retardants, flame retardant synergists, anti-dripping agents and flame retardant fillers can improve the flame retardant properties of the AS composition, thereby being beneficial to the improvement of the GWIT of the AS composition.

[0022] Through research, the inventors discovered that the addition of a PBAT resin with a high intrinsic viscosity can significantly improve the GWIT of an AS composition. This is because when the AS composition comes into contact with a glow-wire, the addition of the PBAT resin makes the AS composition more easily meltable, rapidly expanding the pores formed by melting. This allows the AS composition to separate from the glow-wire, preventing further high-temperature degradation of the AS composition and the generation of more flammable gases, thereby increasing the GWIT temperature of the AS composition. Controlling the intrinsic viscosity of the PBAT resin is critical. The viscosity of the AS resin is typically greater than that of the PBAT resin. If the viscosity of the PBAT resin is too low, it will not be able to fully disperse the PBAT resin in the AS composition, effectively failing to increase the glow-wire ignition temperature and also degrading the mechanical properties of the AS composition. If the viscosity of the PBAT resin is too high, the flowability of the AS composition will decrease, preventing the AS composition from rapidly melting and separating from the glow-wire upon contact, and the GWIT will not be significantly improved.

[0023] Because the present invention adds a certain amount of flame-retardant filler, the toughness of the AS composition cannot reach a good level. The inventors of the present invention further discovered that, when a certain amount of flame-retardant filler is added, the addition of styrene elastomers and chlorinated polyethylene can achieve a good level of mechanical properties for the AS composition. This is because: although styrene elastomers themselves have a good toughening effect and good compatibility with AS resins, the presence of flame-retardant fillers will still affect the dispersibility of styrene elastomers to a certain extent. Chlorinated polyethylene is an amorphous toughening agent that can be well dispersed in the AS composition during melt extrusion, allowing the styrene elastomer and chlorinated polyethylene to maximize their toughening effect in the AS composition of the present invention, thereby improving the mechanical properties of the AS composition. In addition, chlorinated polyethylene contains halogens and produces gases such as hydrogen chloride when decomposed at high temperatures, which has a certain flame retardant effect and can also improve the GWIT of the AS composition.

[0024] That is, the present invention combines styrene elastomer, chlorinated polyethylene, flame retardant, flame retardant synergist, anti-dripping agent, flame retardant filler and PBAT resin with a specific intrinsic viscosity to make the GWIT of the AS composition reach above 775°C, have a high glow-wire ignition temperature, and have good toughness and strength.

[0025] In the present invention, the intrinsic viscosity of PBAT resin can be measured using the Ubbelohde viscometer according to GB / T 14189-2015. Specifically, the test conditions are as follows: a 1:1 mixture of phenol and tetrachloroethane (by mass ratio) is used as the solvent to prepare a PBAT resin solution with a concentration of approximately 0.002 g / ml. The solution is then measured in a constant temperature water bath at 25°C using an IV2400 automatic Ubbelohde viscometer.

[0026] In the present invention, AS resin is used as the main resin, and its content is above 16 wt % of the AS composition.

[0027] Preferably, the AS resin has a melt flow rate of 25-45 g / 10 min measured at 220° C. and 10 kg.

[0028] Preferably, the AS resin has a melt flow rate of 25-40 g / 10 min measured at 220° C. and 10 kg. Within this melt flow rate range, the mechanical properties of the AS resin of the present invention are better.

[0029] In the present invention, the melt flow rate of the AS resin can be measured according to the standard GB / T 3682.1-2018.

[0030] Preferably, the average particle size of the rubber phase of the styrene-based elastomer of the present invention is 30 to 2000 nm.

[0031] Preferably, the rubber content of the rubber phase of the styrene-based elastomer of the present invention is 40-80 wt%.

[0032] Preferably, the styrene content of the rubber phase of the styrene-based elastomer of the present invention is 13 to 35 wt %.

[0033] Preferably, the styrene elastomer has a core-shell structure.

[0034] Preferably, the styrene elastomer is at least one of polybutadiene grafted SAN (ABS high rubber powder), acrylonitrile-EPDM rubber-styrene copolymer or methyl methacrylate-butadiene-styrene copolymer.

[0035] Preferably, the mass ratio of the styrene elastomer to the chlorinated polyethylene is 1:(1-3).

[0036] Preferably, the mass ratio of the styrene elastomer to the chlorinated polyethylene is 1:(2-3). Within this range, the obtained AS composition has better toughness and a higher glow-wire ignition temperature.

[0037] Preferably, the chlorinated polyethylene has a melt flow rate of 5 to 30 g / 10 min measured at 180° C. and 10 kg.

[0038] In the present invention, the melt flow rate of chlorinated polyethylene can be measured according to GB / T 3682.1-2018.

[0039] Preferably, the chlorine content of the chlorinated polyethylene is 30-40 wt%.

[0040] In the present invention, the chlorine content of chlorinated polyethylene can be measured according to GB / T 7139-2023.

[0041] In the present invention, the intrinsic viscosity of the PBAT resin may be 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7 or 2.8 dl / g.

[0042] Preferably, the intrinsic viscosity of the PBAT resin is 2.0-2.3 dl / g. Within this range, the glow-wire ignition temperature of the obtained AS composition is higher.

[0043] The PBAT resin of the present invention can be obtained commercially or homemade, as long as its intrinsic viscosity meets the requirements of the present invention.

[0044] Preferably, in the PBAT resin, the repeating units derived from terephthalic acid account for 45 to 92 mol % of the sum of the repeating units derived from terephthalic acid and the repeating units derived from adipic acid.

[0045] More preferably, in the PBAT resin, the repeating units derived from terephthalic acid account for 69 to 81 mol% of the sum of the repeating units derived from terephthalic acid and the repeating units derived from adipic acid. Within this range, the toughness of the obtained AS composition is better.

[0046] The homemade process of PBAT resin can be as follows:

[0047] 1) terephthalic acid and / or its ester-forming derivative, butanediol, and a catalyst are mixed and reacted at 195-220°C for 2-4 hours to obtain an esterified product A1;

[0048] 2) mixing adipic acid and / or its ester-forming derivative, butanediol, and a catalyst, and reacting at 140-180° C. for 2-3 hours to obtain an esterified product A2;

[0049] 3) Ester A1 and ester A2 are reacted at 240-255° C. and 0-50 Pa for 90-150 min to obtain the PBAT resin.

[0050] Optionally, the amount of the catalyst used in step 1) is 0.01-2% of the combined mass of terephthalic acid and / or its ester derivative and butanediol. The catalyst may be a tin compound, antimony compound, cobalt compound, lead compound, zinc compound, aluminum compound, or titanium compound, more preferably a zinc compound, aluminum compound, or titanium compound, and most preferably a titanium compound. The titanium compound may be n-butyl titanate or tetraisopropyl titanate.

[0051] Optionally, the amount of the catalyst used in step 2) is 0.01-2% of the combined mass of adipic acid and / or its ester derivative and butanediol. The catalyst may be a tin compound, antimony compound, cobalt compound, lead compound, zinc compound, aluminum compound, or titanium compound, more preferably a zinc compound, aluminum compound, or titanium compound, and most preferably a titanium compound. The titanium compound may be n-butyl titanate or tetraisopropyl titanate.

[0052] Preferably, the flame retardant is a brominated flame retardant.

[0053] More preferably, the brominated flame retardant is at least one of tetrabromobisphenol A, tris(tribromophenoxy)triazine, brominated epoxy, decabromodiphenylethane, brominated polyimide, brominated polystyrene, polybrominated styrene, brominated polycarbonate or brominated polyacrylate.

[0054] Preferably, the flame retardant synergist is an antimony-containing compound.

[0055] More preferably, the antimony-containing compound is at least one of antimony pentoxide or sodium antimonate.

[0056] Preferably, the mass ratio of the flame retardant to the flame retardant synergist is (4-2):1.

[0057] Preferably, the flame retardant filler is a flame retardant filler whose surface is modified with a coupling agent.

[0058] The surface of the flame retardant filler is modified with a coupling agent, which can further improve the compatibility of the flame retardant filler with the AS resin, thereby further improving the toughness of the AS composition.

[0059] More preferably, the coupling agent is a silane coupling agent; the silane coupling agent contains at least one of an epoxy group or a base group, including but not limited to at least one of 3-glycidyloxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-n-butyl-3-aminopropyltriethoxysilane or anilinemethyltriethoxysilane.

[0060] More preferably, in the flame retardant filler whose surface is modified with a coupling agent, the content of the coupling agent is 1-3 wt %.

[0061] More preferably, the flame retardant filler with a surface modified with a coupling agent is prepared as follows: the flame retardant filler is mixed with a coupling agent to obtain the flame retardant filler with a surface modified with a coupling agent.

[0062] The flame retardant fillers commonly used in the art can be used in the present invention.

[0063] Preferably, the flame retardant filler is at least one of magnesium hydroxide, magnesium carbonate, zinc carbonate, ammonium polyphosphate, melamine polyphosphate, zinc hydroxide or melamine cyanurate.

[0064] More preferably, the flame-retardant filler comprises a first flame-retardant filler and a second flame-retardant filler in a mass ratio of 1:(0.5-2); the first flame-retardant filler has an initial decomposition temperature of 300-380°C, and the second flame-retardant filler has an initial decomposition temperature of 400-460°C. The initial decomposition temperature can be measured by thermogravimetric analysis using a thermogravimetric analyzer under a nitrogen atmosphere at a heating rate of 20°C / min. The first-order derivative curve (DTG curve) is obtained. The peak of the first-order derivative curve corresponds to the maximum weight loss rate, which is the initial decomposition temperature.

[0065] The AS composition of the present invention can have a required glow-wire ignition temperature by selecting a single flame-retardant filler, and the glow-wire ignition temperature of the AS composition can be made higher by further selecting composite flame-retardant fillers with different initial decomposition temperatures.

[0066] More preferably, the average particle size of the flame retardant filler is 1-18 μm.

[0067] Further preferably, the average particle size of the first flame retardant filler is 1-18 μm; the average particle size of the second flame retardant filler is 1-6 μm.

[0068] The average particle size of the flame retardant filler can be measured in accordance with GB / T 19077-2016.

[0069] Further preferably, the first flame retardant filler is at least one of magnesium hydroxide, magnesium carbonate, zinc carbonate, ammonium polyphosphate (average degree of polymerization greater than 100) or melamine polyphosphate.

[0070] Further preferably, the average degree of polymerization of the ammonium polyphosphate is ≥100.

[0071] Further preferably, the second flame retardant filler is at least one of zinc hydroxide or melamine cyanurate.

[0072] Preferably, the anti-drip agent includes but is not limited to polytetrafluoroethylene.

[0073] Preferably, the AS composition further comprises 0.1 to 2 parts of other auxiliary agents.

[0074] More preferably, the other auxiliary agents include but are not limited to at least one of an antioxidant, a lubricant, a weathering agent or a colorant.

[0075] Further preferably, the antioxidant includes but is not limited to at least one of a hindered phenol antioxidant or a phosphite antioxidant.

[0076] Further preferably, the lubricant includes but is not limited to at least one of an amide lubricant, a stearate lubricant, an ester lubricant or a silicone lubricant.

[0077] Further preferably, the weathering agent includes but is not limited to at least one of a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber or a hindered amine light stabilizer.

[0078] Further preferably, the colorant includes at least one of a pigment-type colorant, a dye-type colorant, or a colorant with special aesthetic effects.

[0079] The preparation method of the above-mentioned AS composition comprises the following steps: mixing the components, melt-extruding, and granulating to obtain the AS composition.

[0080] Preferably, the temperature of the melt extrusion is 160-220°C.

[0081] Preferably, the screw aspect ratio of the melt extruder is 30-45:1, and the screw speed is 200-800 rpm.

[0082] The use of the above-mentioned AS composition in the preparation of household items, electronic components, household appliances, gardening equipment, medical technology equipment, motor vehicle parts or body parts also falls within the scope of protection of the present invention.

[0083] In particular, the AS composition can be used to prepare articles having good strength, good toughness and high glow-wire ignition temperature, and in particular, can be used to prepare housings of household appliances.

[0084] Preferably, the household appliance is an unattended household appliance.

[0085] More preferably, the household appliance is a dishwasher, a microwave oven, a dehumidifier or a heater.

[0086] Compared with the prior art, the present invention has the following beneficial effects:

[0087] The AS composition of the present invention has a high glow-wire ignition temperature, good toughness and strength, and is particularly suitable for preparing parts that need to have good strength, good toughness and a high glow-wire ignition temperature. DETAILED DESCRIPTION

[0088] In order to more clearly and completely describe the technical solution of the present invention, the present invention is further described in detail through specific embodiments below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Various changes can be made within the scope of the rights of the present invention.

[0089] Some of the reagents selected in the embodiments and comparative examples of the present invention are described as follows:

[0090] AS resin 1#: KFA-130, Liaoning Jinfa, melt flow rate: 39 g / 10 min;

[0091] AS resin 2#: SAN NF2200, Taiwan Chemical Fiber Co., Ltd., melt flow rate: 29 g / 10 min;

[0092] AS resin 3#: SAN 2150, INEOS Styrolution Group Ltd., melt flow rate: 45 g / 10 min;

[0093] PBAT resin 1#: Homemade, the preparation process is as follows:

[0094] 1) Terephthalic acid (PTA) and 1,4-butanediol (BDO) were added to an esterification reactor at a molar ratio of 1:1.05, and n-butyl titanate (catalyst) was added at a concentration of 1% by weight of the total raw materials. The reaction was continued at 210°C and atmospheric pressure for 180 minutes to obtain ester A1.

[0095] 2) Adipic acid (AA) and 1,4-butanediol (BDO) were added to an esterification reactor at a molar ratio of 1:1.05, and n-butyl titanate (catalyst) was added at a concentration of 1% by weight of the total raw materials. The reaction was continued at 150°C and atmospheric pressure for 160 minutes to obtain ester A2.

[0096] 3) The esters A1 and A2 were continuously fed into a mixer for mixing. The ratio of repeating units derived from terephthalic acid to repeating units derived from succinic acid was controlled by adjusting the mass flow rate ratio of the two esters. The reaction was conducted at 250°C and 50 Pa for 110 minutes to obtain PBAT resin 1#. The intrinsic viscosity of PBAT resin 1# was 2.3 dl / g. The repeating units derived from terephthalic acid accounted for 81% of the total molar weight of the repeating units derived from the dibasic acid.

[0097] PBAT Resin 2#: Homemade. Its main difference from PBAT Resin 1# is that in step 3), the temperature was 245°C and the reaction time was 90 minutes. PBAT Resin 2# had an intrinsic viscosity of 2.0 dl / g. The repeating units derived from terephthalic acid accounted for 81% of the total molar weight of the repeating units derived from the diacid.

[0098] PBAT Resin 3#: Homemade. Its main differences from PBAT Resin 1# are: In step 3, the temperature was 255°C and the reaction time was 150 minutes. PBAT Resin 3# had an intrinsic viscosity of 2.8 dl / g; the repeating units derived from terephthalic acid accounted for 81% of the total molar weight of the repeating units derived from the diacid.

[0099] PBAT Resin 4#: Homemade. Its main differences from PBAT Resin 1# are: in step 3), the mass flow rate ratio of the two esters was varied, and the reaction temperature was controlled at 255°C for 120 minutes. PBAT Resin 4# has an intrinsic viscosity of 2.3 dl / g; the repeating units derived from terephthalic acid account for 69% of the total molar weight of the repeating units derived from the diacid.

[0100] PBAT Resin 5#: Homemade. Its main differences from PBAT Resin 1# are: in step 3), the mass flow rate ratio of the two esters was varied, and the reaction temperature and time were controlled at 245°C and 100 minutes. PBAT Resin 1# has an intrinsic viscosity of 2.3 dl / g; the repeating units derived from terephthalic acid account for 91% of the total molar weight of the repeating units derived from the diacid.

[0101] PBAT Resin 6#: Homemade. Its main differences from PBAT Resin 1# are: in step 3), the reaction temperature is 230°C and the reaction time is 60 minutes. PBAT Resin 6# has an intrinsic viscosity of 1.4 dl / g; the repeating units derived from terephthalic acid account for 81% of the total molar weight of the repeating units derived from the diacid.

[0102] PBAT Resin 7#: Homemade. Its main differences from PBAT Resin 1# are: in step 3), the reaction temperature is 265°C and the reaction time is 160 minutes. PBAT Resin 7# has an intrinsic viscosity of 3.0 dl / g; the repeating units derived from terephthalic acid account for 81% of the total molar weight of the repeating units derived from the diacid.

[0103] PBAT resin A#: A400, Zhuhai Wantong Chemical Co., Ltd., intrinsic viscosity 2.0 dl / g, repeating units derived from terephthalic acid account for 45 wt% of the total molar amount of repeating units derived from dibasic acid.

[0104] Styrene elastomer 1#: Polybutadiene grafted SAN, HR-181, Kumho Petrochemical Co., Ltd., South Korea

[0105] Styrene elastomer 2#: methyl methacrylate-butadiene-styrene copolymer, EM-500A, LG Chemical, South Korea;

[0106] Chlorinated polyethylene 1#: CPE135C, Hangzhou Keli Chemical Co., Ltd., chlorine content is 35wt%;

[0107] Other toughening agents 1#: acrylic impact modifier, KM-355P, Dow Chemical, USA;

[0108] Flame retardant 1#: tris(tribromophenoxy)triazine, commercially available.

[0109] Flame retardant 2#: brominated epoxy, commercially available.

[0110] Flame retardant synergist: antimony trioxide, commercially available.

[0111] The first flame retardant filler 1#: magnesium hydroxide, Aitemag 12FD, Jiangsu Aitek Flame Retardant Material Co., Ltd., with an initial decomposition temperature of 370°C and a particle size of D 50 1.0 μm;

[0112] First flame retardant filler 2#: ammonium polyphosphate, APP101, Shouguang Weidong Chemical Co., Ltd., initial decomposition temperature is 306℃, particle size D 50 15 μm;

[0113] Second flame retardant filler 1#: melamine cyanurate, MCA, Shandong Haiwang Chemical Co., Ltd., initial decomposition temperature is 424℃, particle size D 50 4 μm;

[0114] Second flame retardant filler 2#: zinc hydroxide, Hubei Fangde New Materials Co., Ltd., initial decomposition temperature is 441℃, particle size D 50 5 μm;

[0115] Composite flame retardant filler 1#: homemade, the process is as follows: the first flame retardant filler 1# and the second flame retardant filler 1# are mixed in a mass ratio of 1:1 to obtain flame retardant filler 1#;

[0116] Composite flame retardant filler 2#: homemade, the difference from flame retardant filler 1# is that the first flame retardant filler 1# is replaced by the first flame retardant filler 2#.

[0117] Composite flame retardant filler 3#: homemade, the difference from flame retardant filler 1# is that the second flame retardant filler 1# is replaced by the second flame retardant filler 2#.

[0118] Anti-dripping agent: polytetrafluoroethylene, SN3201, Guangzhou Entropy Innovation Materials Co., Ltd.

[0119] Other additives 1#: antioxidant 1010 and antioxidant 168 mixed in a mass ratio of 1:2, where both antioxidant 1010 and antioxidant 168 are commercially available products;

[0120] Other additives 2#: lubricant, ethylene bisstearamide, commercially available.

[0121] Unless otherwise specified, the components (such as anti-dripping agents and other additives) used in the parallel examples and comparative examples are all the same commercially available products.

[0122] The performance of the AS compositions provided in the various embodiments and comparative examples of the present invention was measured using the following test methods:

[0123] (1) Glow-wire ignition (GWIT) temperature: in accordance with IEC 60695-2-13 (using a 100mm*100mm*2.0mm square plate);

[0124] (2) Izod notched impact strength: in accordance with ISO 180 / 1A-2000 (4 mm, 23°C);

[0125] (3) Tensile strength: in accordance with ISO 527-2012 (50 mm / min).

[0126] The AS compositions of the examples and comparative examples of the present invention were prepared by the following preparation method:

[0127] The components were weighed according to the formula, mixed uniformly, and melt-extruded and granulated using a twin-screw extruder to obtain the AS composition. The temperatures in zones 1 to 10 of the twin-screw extruder were 160°C, 180°C, 190°C, 200°C, 210°C, 210°C, 210°C, 220°C, and 220°C, respectively; the screw aspect ratio was 40:1; and the screw speed was 600 rpm.

[0128] Examples 1 to 16

[0129] Examples 1 to 16 provide a series of AS compositions, the formulations of which are shown in Tables 1 and 2.

[0130] Table 1 Formulas of Examples 1 to 8 (parts by weight)

[0131]

[0132] Table 2 Formulas of Examples 9 to 16 (parts by weight)

[0133]

[0134] Comparative Examples 1 to 7

[0135] Comparative Examples 1 to 7 provide a series of AS compositions, the formulations of which are shown in Table 3.

[0136] Table 3 Formulas of Comparative Examples 1 to 7 (parts by weight)

[0137]

[0138] The properties of the AS compositions of the embodiments and comparative examples were measured according to the above-mentioned test methods. The test results are shown in Table 4.

[0139] Table 4 Performance test results of AS compositions of various examples and comparative examples

[0140]

[0141] From Table 4 we can see that:

[0142] The GWIT of the AS compositions of Examples 1 to 16 can reach above 775°C, and the Izod notched impact strength can reach 15KJ / m 2 , and the tensile strength can reach above 33 MPa, indicating that the AS composition of the present invention has a high glow-wire ignition temperature, good toughness and strength.

[0143] Comparative Example 1 omitted the addition of PBAT resin, resulting in an AS composition with a GWIT temperature of no more than 775°C and reduced mechanical properties compared to Example 1. The viscosity of the PBAT resins added in Comparative Examples 2 and 3 was inappropriate, resulting in an AS composition with a GWIT temperature of no more than 775°C and poor mechanical properties compared to Example 2. Comparative Example 4 replaced chlorinated polyethylene with another toughening agent, resulting in an AS composition with a GWIT temperature of no more than 775°C and poor toughness, and a decrease in tensile strength compared to Example 1. Comparative Example 5 replaced the styrene elastomer with another toughening agent, resulting in an AS composition with poor toughness. Comparative Example 6 added only a styrene elastomer without the addition of chlorinated polyethylene, resulting in an AS composition with a GWIT temperature of no more than 775°C and poor toughness, and a decrease in tensile strength compared to Example 1. Comparative Example 7 added only chlorinated polyethylene without the addition of a styrene elastomer, resulting in an AS composition with poor toughness.

[0144] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An AS composition, characterized in that The composition comprises the following components in parts by weight: 20~50 parts of AS resin, 6~10 parts of styrene elastomer, 12~20 parts of chlorinated polyethylene, PBAT resin 4~21 parts, 6~15 parts of flame retardant, 2~5 parts of flame retardant synergist, 10~18 parts of flame retardant filler, 0.5~2 parts of anti-dripping agent; The intrinsic viscosity of the PBAT resin is 1.85~2.85 dl / g.

2. The AS composition according to claim 1, characterized in that The melt flow rate of the AS resin measured at 220° C. and 10 kg is 25-45 g / 10 min.

3. The AS composition according to claim 1, characterized in that The styrene elastomer is at least one of polybutadiene grafted SAN, acrylonitrile-EPDM rubber-styrene copolymer or methyl methacrylate-butadiene-styrene copolymer.

4. The AS composition according to claim 1, characterized in that The chlorine content of the chlorinated polyethylene is 30-40 wt %.

5. The AS composition according to claim 1, characterized in that In the PBAT resin, the repeating units derived from terephthalic acid account for 45 to 92 mol % of the sum of the repeating units derived from terephthalic acid and the repeating units derived from adipic acid.

6. The AS composition according to claim 1, characterized in that The flame retardant is a brominated flame retardant.

7. The AS composition according to claim 1, characterized in that The flame retardant filler is at least one of magnesium hydroxide, magnesium carbonate, zinc carbonate, ammonium polyphosphate, melamine polyphosphate, zinc hydroxide or melamine cyanurate.

8. The AS composition according to claim 1, characterized in that The AS composition further comprises 0.1 to 2 parts of other auxiliary agents.

9. The method for preparing the AS composition according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing the components, melt-extruding, and granulating to obtain the AS composition.

10. Use of the AS composition according to any one of claims 1 to 8 in the preparation of household items, electronic components, household appliances, gardening equipment, medical technology equipment, motor vehicle parts or body parts.

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