WO2020134844A1 - 聚苯乙烯复合材料及其制备方法 - Google Patents

聚苯乙烯复合材料及其制备方法 Download PDF

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WO2020134844A1
WO2020134844A1 PCT/CN2019/121732 CN2019121732W WO2020134844A1 WO 2020134844 A1 WO2020134844 A1 WO 2020134844A1 CN 2019121732 W CN2019121732 W CN 2019121732W WO 2020134844 A1 WO2020134844 A1 WO 2020134844A1
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composite material
acrylate
polymer
polystyrene
styrene
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PCT/CN2019/121732
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English (en)
French (fr)
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戴建建
官焕祥
唐磊
黄宝奎
付锦锋
杨霄云
黄险波
叶南飚
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金发科技股份有限公司
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Priority to AU2020101213A priority Critical patent/AU2020101213A4/en
Publication of WO2020134844A1 publication Critical patent/WO2020134844A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers

Definitions

  • the invention relates to the technical field of polymer materials, in particular to a polystyrene composite material and a preparation method thereof.
  • Polystyrene refers to a polymer synthesized by free radical addition polymerization of styrene monomer.
  • Polystyrene includes ordinary polystyrene, expanded polystyrene, high impact polystyrene and syndiotactic polystyrene.
  • High impact polystyrene (HIPS for short) is a graft copolymer of styrene and polybutadiene rubber. Polybutadiene is toughened as rubber, which improves the impact strength, so that HIPS has both high strength and good toughness. It is widely used in household appliances, electronic appliances and packaging industries.
  • high-impact polystyrene contains rubber with a large particle size structure, which makes the surface of the material soft.
  • the product When used as a shell material, the product will inevitably collide with and rub against hard objects during preparation, transportation, and use, which makes the surface prone to obvious scratches, which affects the appearance of the surface and hinders its application.
  • the general approach is to add a scratch-resistant agent to increase the scratch-resistant performance, but simply adding a scratch-resistant agent can only reduce the clarity of the scratch, and can not improve the surface resistance of the material to sharp objects. Moreover, the excessive addition of scratch-resistant agents also increases the risk of precipitation during use and reduces the durability.
  • Another method is to add a large amount of filler to increase the scratch resistance, but the filler will seriously reduce the surface gloss of the material and affect the appearance of the parts. And also reduce the toughness of the material.
  • the purpose of the present invention is to overcome the above technical defects and provide a polystyrene composite material, which has the advantages of good toughness and good appearance.
  • Another object of the present invention is to provide a method for preparing the above polystyrene composite material.
  • a polystyrene composite material including the following components:
  • HIPS Polystyrene-polybutadiene graft copolymer
  • polyacrylate polymer can make HIPS increase the surface hardness, thereby improving the scratch resistance.
  • compatibility between HIPS and polyacrylate polymers is very poor.
  • polyacrylate polymers When more polyacrylate polymers are added, they will coagulate to form tiny clusters, which not only leads to a significant decrease in toughness, but also "dark lines” and gloss The degree of decline, the surface and pearlescent, affect the appearance.
  • the existing commonly used compatibilizers are not very compatible with each other (styrene-nylon 6 graft copolymer, styrene-ethylene/propylene diblock copolymer has good compatibility with HIPS, but it is compatible with polymer Acrylic polymers have poor compatibility and cannot play a good compatibilizing role for polyacrylate polymers; SBS or SEBS have good compatibility with HIPS, but poor compatibility with polyacrylate polymers , At the same time will have a great impact on gloss).
  • SBS or SEBS have good compatibility with HIPS, but poor compatibility with polyacrylate polymers , At the same time will have a great impact on gloss).
  • the present invention found that styrene-acrylate copolymers as compatibilizers can effectively improve the compatibility of HIPS and polyacrylates, thereby improving the dark streak phenomenon, pearlescence phenomenon, improving the surface gloss, and improving the surface hardness. At the same time, the toughness of the composite material is guaranteed.
  • the polyacrylate polymer is selected from polymethyl acrylate polymer, polyethyl acrylate polymer, polypropyl acrylate polymer, polybutyl acrylate polymer, polypentyl acrylate polymer At least one of
  • the polyacrylate polymer is at least one selected from polymethyl acrylate polymers and polyethyl acrylate polymers.
  • the hardness and gloss of the polystyrene composite material of the present invention can be adjusted according to the polyacrylate polymers of different substituents.
  • the above two types of polyacrylate polymers have a relatively high hardness and gloss. In a small number of cases, it can meet the needs of improving the hardness and gloss in common situations.
  • the weight average molecular weight Mw of the polyacrylate polymer is 80,000 g/mol to 300,000 g/mol;
  • the weight average molecular weight Mw of the polyacrylate polymer is 140,000 g/mol to 190000 g/mol.
  • the styrene-acrylate copolymer is selected from at least one of styrene-acrylate copolymer and styrene-butadiene-acrylate copolymer.
  • styrene-acrylate copolymers are generally used to prepare core-shell structures for toughening.
  • styrene-butadiene-acrylate copolymers are generally used to prepare MBS with a core-shell structure and for toughening PVC.
  • Styrene-acrylate copolymers can be prepared as emulsions for coatings. So far, it has not been reported that it is used for compatibilizing applications of HIPS and polyacrylate polymers, and the styrene-acrylate copolymer has a certain glossiness, which can further enhance the glossiness of the polystyrene composite material and achieve high glossiness. The effect of good appearance.
  • the content of acrylate in the styrene-acrylate copolymer is in the range of 20-60%.
  • the acrylate content is in the range of 20-60%, and the styrene-acrylate copolymer has good compatibility with HIPS and polyacrylate polymers.
  • the weight average molecular weight Mw of the polystyrene-polybutadiene graft copolymer is 80,000 g/mol to 180,000 g/mol, based on the total weight of the polystyrene-polybutadiene graft copolymer segment , Polybutadiene content is 10% to 40%.
  • the parameters of the polystyrene-polybutadiene graft copolymer are within the above range, so that the material can obtain better comprehensive mechanical properties and good processing performance to meet the actual application needs.
  • the test result of the weight average molecular weight of a general polymer is a wide range of "inverted U-shaped curve" similar to a normal distribution, with a highest value, as long as the highest value is within the scope of the requirements of the present invention, it falls within the protection of the present invention range.
  • the scratch-resistant agent may further include 0-3 parts of the scratch-resistant agent; the scratch-resistant agent is selected from at least one of stearate scratch-resistant agents and silicone-based scratch-resistant agents.
  • additives are selected from flame retardants, heat stabilizers, antioxidants, flame retardant synergists, anti-dripping agents, light stabilizers, plasticizers At least one of an agent, filler and colorant.
  • the lubricant is a metal stearate lubricant, an alkyl stearate lubricant, a pentaerythritol stearate lubricant, paraffin wax, or montan wax.
  • the heat stabilizer is an organic phosphite, preferably triphenyl phosphite, tri-(2,6-dimethylphenyl) phosphite, tri-nonylphenyl phosphite, dimethylbenzene Phosphonate or trimethyl phosphate.
  • the antioxidant is an organic phosphite, alkylated monohydric phenol or polyhydric phenol, polyhydric phenol and diene alkylation reaction product, p-cresol or dicyclopentadiene butylation reaction product, alkyl Hydroxyquinones, hydroxylated thiodiphenyl ethers, alkylene-bisphenols, benzyl compounds or polyol ester antioxidants.
  • the flame retardant synergist is a silicon-containing compound or a fluorine-containing compound, preferably silicone, dimethylsiloxane, phenylsiloxane, methoxysiloxane, polytetrafluoroethylene, propylene Nitrile-butadiene copolymer SAN coated polytetrafluoroethylene, polycarbonate PC coated polytetrafluoroethylene, emulsion polytetrafluoroethylene or perfluorosulfonate.
  • the light stabilizer is at least one of a benzotriazole light stabilizer or a benzophenone light stabilizer.
  • the plasticizer is phthalate.
  • the colorant is a pigment or dye.
  • the preparation method of the above polystyrene composite material includes the following steps:
  • the invention increases the hardness of the composite material by adding polyacrylate to the polystyrene-polybutadiene graft copolymer (HIPS), and then improves by adding a special compatibilizer styrene-acrylate copolymer
  • HIPS polystyrene-polybutadiene graft copolymer
  • a special compatibilizer styrene-acrylate copolymer ensures the toughness of the material, and the hardness is further improved (good scratch resistance and long-term preservation of good appearance), eliminating Dark lines, pearlescent, and improved surface gloss.
  • the polystyrene composite material of the present invention has the advantages of high toughness and good appearance.
  • the raw materials used in the present invention are all derived from commercially available products.
  • Polystyrene-polybutadiene graft copolymer weight average molecular weight is about 140,000g/mol, polybutadiene content is about 33%;
  • Styrene-acrylate copolymer A The content of acrylate is about 46%;
  • Styrene-acrylate copolymer B the content of acrylate is about 76%
  • PMMA-A Polymethyl methacrylate A
  • Polymethyl methacrylate B (hereinafter referred to as PMMA-B): the highest value of the weight average molecular weight is about 129000g/mol;
  • PEBA Polybutyl acrylate
  • PBMA Polybutyl methacrylate
  • compatibilizer A styrene-ethylene/propylene diblock copolymer
  • Antioxidant pentaerythritol ester antioxidant, phosphite antioxidant
  • Lubricant Ethylene bis stearamide.
  • the preparation method of the polystyrene composite material of the examples and comparative examples the raw materials are weighed according to the proportion, and then the polystyrene-polybutadiene graft copolymer, polyacrylate, styrene-acrylate copolymer (or Other compatibilizers), additives are mixed uniformly at high speed, melted and extruded into the main machine to obtain polystyrene composite material, the screw temperature is 210-230 °C.
  • Various performance test methods are:
  • Rockwell hardness is tested according to GB230.1-2004 "Rockwell hardness test method", the test sample is a 6mm thick diameter disc; pencil hardness is measured according to GB/T 6739-2006 "color paint and varnish pencil method” Paint film hardness” test.
  • Table 1 Example polystyrene composite material distribution ratio (parts by weight) and various performance test results
  • the weight average molecular weight Mw of the polyacrylate polymer is preferably 140,000 g/mol to 190000 g/mol .
  • Example 1 and Example 8 It can be seen from Example 1 and Example 8 that the styrene-acrylate copolymer is within the preferred range, and the various properties are better, especially the notch impact strength is better maintained.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Graft Or Block Polymers (AREA)

Abstract

一种聚苯乙烯复合材料，其特征在于，按重量份计，包括以下组分：聚苯乙烯-聚丁二烯接枝共聚物100份；聚丙烯酸酯类聚合物5-70份；苯乙烯-丙烯酸酯类共聚物1-15份。该聚苯乙烯复合材料具有韧性好、良外观的优点。

Description

[根据细则37.2由ISA制定的发明名称]　聚苯乙烯复合材料及其制备方法 技术领域
本发明涉及高分子材料技术领域，特别是涉及一种聚苯乙烯复合材料及其制备方法。
背景技术
聚苯乙烯是指由苯乙烯单体经自由基加聚反应合成的聚合物。聚苯乙烯包括普通聚苯乙烯、发泡聚苯乙烯、高抗冲聚苯乙烯及间规聚苯乙烯等。高冲聚苯乙烯(简称HIPS)为苯乙烯和聚丁二烯橡胶的接枝共聚物。聚丁二烯作为橡胶增韧，提高了冲击强度，使HIPS同时具有较高的强度和良好的韧性。其广泛应用于家电、电子电器和包装行业中。
但是，高冲聚苯乙烯中含有大粒径结构的橡胶，使材料表面变软。当用于外壳材料时，产品在制备、运输和使用的过程中难免会与硬物碰撞、摩擦，而使表面易出现明显的划痕，影响表面美观度，阻碍了其应用。
一般的做法是加入耐划伤剂来增加耐划伤性能，但是单纯加入耐划伤剂，只能减轻划痕的清晰，无法提高材料表面抵抗尖锐物体产生划痕。并且，过多的加入耐划伤剂，也加大了使用时析出的风险，耐用性下降。
还有的做法是加入大量填料来增加耐划伤性能，但是填料会严重降低材料的表面光泽度，影响制件的美观。并且对材料的韧性也有降低作用。
发明内容
本发明的目的在于，克服以上技术缺陷，提供一种聚苯乙烯复合材料，其具有韧性好、良外观的优点。
本发明的另一目的在于，提供上述聚苯乙烯复合材料的制备方法。
本发明是通过以下技术方案实现的：
一种聚苯乙烯复合材料，按重量份计，包括以下组分：
聚苯乙烯-聚丁二烯接枝共聚物(HIPS)   100份；
聚丙烯酸酯类聚合物                  5-70份；
苯乙烯-丙烯酸酯类共聚物             1-15份。
聚丙烯酸酯类聚合物的加入能够使HIPS提升表面硬度，进而提高了耐划伤性能。但是HIPS与聚丙烯酸酯类聚合物的相容性很差，当加入较多的聚丙烯酸酯类聚合物后会凝结形成微小团，不仅导致韧性的大幅下降，还会出现“暗纹”并且光泽度下降、表面还有珠光，影响外观。现有的常用相容剂不能很好的使两者相容(苯乙烯-尼龙6接枝共聚物、苯乙烯-乙烯/丙烯二嵌段共聚物与HIPS的相容性较好，但与聚丙烯酸酯类聚合物相容性差，无法对聚 丙烯酸酯类聚合物起到很好的增容作用；SBS或SEBS均与HIPS的相容性较好，但与聚丙烯酸酯类聚合物相容性差，同时会对光泽度有很大影响)。本发明发现，苯乙烯-丙烯酸酯类共聚物作为相容剂，能够有效提升HIPS与聚丙烯酸酯的相容性，进而改善了暗纹现象、珠光现象，提高表面光泽度，提升了表面硬度的同时保证了复合材料的韧性。
所述的聚丙烯酸酯类聚合物选自聚丙烯酸甲酯类聚合物、聚丙烯酸乙酯类聚合物、聚丙烯酸丙酯类聚合物、聚丙烯酸丁酯类聚合物、聚丙烯酸戊酯类聚合物中的至少一种；
优选的，所述的聚丙烯酸酯类聚合物选自聚丙烯酸甲酯类聚合物、聚丙烯酸乙酯类聚合物中的至少一种。
可以根据不同取代基的聚丙烯酸酯类聚合物来调节本发明聚苯乙烯复合材料的硬度、光泽度，上述两类聚丙烯酸酯类聚合物，硬度和光泽度都综合较高，在加入量较少的情况下即可满足常用情形下的硬度、光泽度提升的需求。
所述的聚丙烯酸酯类聚合物重均分子量Mw为80000g/mol-300000g/mol；
以聚苯乙烯复合材料的硬度和加工性能的综合性能作为优先指标，优选的，所述的聚丙烯酸酯类聚合物重均分子量Mw为140000g/mol-190000g/mol。
聚丙烯酸酯类聚合物的重均分子量越大，硬度相对也越大，对聚苯乙烯复合材料的硬度提升较好。但是，聚丙烯酸酯类聚合物的分子量太大，会导致太硬而增加加工难度。
所述的苯乙烯-丙烯酸酯类共聚物选自苯乙烯-丙烯酸酯共聚物、苯乙烯-丁二烯-丙烯酸酯共聚物中的至少一种。
一般的，苯乙烯-丙烯酸酯类共聚物一般用于制备成核壳结构，用于增韧。具体的，苯乙烯-丁二烯-丙烯酸酯类共聚物一般用于制备成核壳结构的MBS，用于PVC的增韧。苯乙烯-丙烯酸酯共聚物可以制备成乳液状，用于涂料。至今没有报道其用于HIPS与聚丙烯酸酯类聚合物的增容应用，并且苯乙烯-丙烯酸酯类共聚物具有一定的光泽度，能够进一步提升聚苯乙烯复合材料的光泽度，达到高光泽度的良外观的效果。
优选的，所述的苯乙烯-丙烯酸酯类共聚物中丙烯酸酯的含量在20-60％范围内。
丙烯酸酯的含量在20-60％范围内，苯乙烯-丙烯酸酯类共聚物对于HIPS与聚丙烯酸酯类聚合物的相容性较好。
优选的，所述的聚苯乙烯-聚丁二烯接枝共聚物的重均分子量Mw为80000g/mol至180000g/mol，以聚苯乙烯-聚丁二烯接枝共聚物链段总重量计，聚丁二烯含量在10％至40％。聚苯乙烯-聚丁二烯接枝共聚物的参数在上述范围内，可使材料获得较好的综合力学性能以及良好的加工性能，满足实际应用需求。
一般聚合物的重均分子量的测试结果为一个宽范围的类似正态分布的“倒U型曲线”，有一个最高值，只要最高值在本发明的要求范围内，即落入本发明的保护范围。
按重量份计，还可以包括0-3份的耐划伤剂；所述的耐划伤剂选自硬脂酸盐耐划伤剂、硅酮类耐划伤剂中的至少一种。
按重量份计，还包括0.1-10份的助剂；所述助剂选自阻燃剂、热稳定剂、抗氧剂、阻燃增效剂、抗滴落剂、光稳定剂、增塑剂、填料和着色剂中的至少一种。
所述润滑剂为硬脂酸金属盐类润滑剂、硬脂酸烷基酯类润滑剂、硬脂酸季戊四醇酯类润滑剂、石蜡或褐煤蜡。
所述热稳定剂为有机亚磷酸酯，优选为亚磷酸三苯酯、亚磷酸三-(2,6-二甲基苯基)酯、亚磷酸三-壬基苯基酯、二甲基苯膦酸酯或磷酸三甲酯。
所述抗氧剂为有机亚磷酸酯、烷基化的一元酚或者多元酚、多元酚和二烯的烷基化反应产物、对甲酚或者二环戊二烯的丁基化反应产物、烷基化的氢醌类、羟基化的硫代二苯基醚类、亚烷基-双酚、苄基化合物或多元醇酯类抗氧剂。
所述阻燃增效剂为含硅的化合物或含氟的化合物，优选为硅氧烷、二甲基硅氧烷、苯基硅氧烷、甲氧基硅氧烷、聚四氟乙烯、丙烯腈-丁二烯共聚物SAN包覆的聚四氟乙烯、聚碳酸酯PC包覆的聚四氟乙烯、乳液聚四氟乙烯或全氟磺酸盐。
所述光稳定剂为苯并三唑类光稳定剂或二苯甲酮类光稳定剂中的至少一种。
所述增塑剂为邻苯二甲酸酯。
所述着色剂为颜料或染料。
上述的聚苯乙烯复合材料的制备方法，包括以下步骤：
按照配比称量原料，再将聚苯乙烯-聚丁二烯接枝共聚物、聚丙烯酸酯、苯乙烯-丙烯酸酯类共聚物、助剂高速混合均匀，在加入主机中熔融挤出造粒得到聚苯乙烯复合材料，螺杆温度为210-230℃。
本发明具有如下有益效果
本发明通过在聚苯乙烯-聚丁二烯接枝共聚物(HIPS)中加入聚丙烯酸酯，提高了复合材料的硬度，再通过加入特殊的相容剂苯乙烯-丙烯酸酯类共聚物，提高了聚苯乙烯-聚丁二烯接枝共聚物和聚丙烯酸酯的相容性，保证了材料的韧性，也进一步提高了硬度(耐划伤性能好，能长久保存良好的外观)，消除了暗纹、珠光，并提高了表面光泽度。综上，本发明的聚苯乙烯复合材料具有高韧性、良外观的优点。
具体实施方式
本发明通过以下实施例来进一步说明本发明，但是本发明不受以下实施例限制。
本发明所用原料均来源于市售产品。
聚苯乙烯-聚丁二烯接枝共聚物：重均分子量约为140000g/mol，聚丁二烯含量约为33％；
苯乙烯-丙烯酸酯共聚物A：丙烯酸酯的含量约为46％；
苯乙烯-丙烯酸酯共聚物B：丙烯酸酯的含量约为76％；
聚甲基丙烯酸甲酯A(下文中简称PMMA-A)：重均分子量最高值约为161000g/mol；
聚甲基丙烯酸甲酯B(下文中简称PMMA-B)：重均分子量最高值约为129000g/mol；
聚乙基丙烯酸丁酯(PEBA)：重均分子量最高值约为154000g/mol；
聚甲基丙烯酸丁酯(PMBA)：重均分子量最高值约为189000g/mol；
聚丁基丙烯酸甲酯(PBMA)：重均分子量最高值约为146000g/mol；
其他相容剂A：苯乙烯-乙烯/丙烯二嵌段共聚物；
其他相容剂B：SEBS；
抗氧剂：季戊四醇酯类抗氧剂，亚磷酸酯类抗氧剂；
润滑剂：乙撑双硬脂酰胺。
实施例和对比例聚苯乙烯复合材料的制备方法：按照配比称量原料，再将聚苯乙烯-聚丁二烯接枝共聚物、聚丙烯酸酯、苯乙烯-丙烯酸酯类共聚物(或者其他相容剂)、助剂高速混合均匀，在加入主机中熔融挤出造粒得到聚苯乙烯复合材料，螺杆温度为210-230℃。各项性能测试方法：
(1)冲击强度：按照GB1843-1996《塑料悬臂梁冲击试验方法》标准测试，摆锤能量2.75J，常温测试。
(2)硬度：洛氏硬度按GB230.1-2004《洛氏硬度实验方法》测试，测试样品为6mm厚直径的圆片；铅笔硬度按GB/T 6739-2006《色漆和清漆铅笔法测定漆膜硬度》测试。
(3)百格：注塑出100×100mm带皮纹方板，按《GB9286-1998色漆和清漆漆膜的划格试验》进行划百格，之后在显微镜下观察划痕△L，△L越小越好。
(4)光泽度：按《GB/T 8807-1988塑料镜面光泽试验方法》以60°角度测试光泽度。
(5)暗纹：注塑长200mm、宽50mm、厚2mm的矩形板，目视观察表面暗纹。
表1：实施例聚苯乙烯复合材料各组分配比(重量份)及其各项性能测试结果
Figure PCTCN2019121732-appb-000001
Figure PCTCN2019121732-appb-000002
表2：对比例聚苯乙烯复合材料各组分配比(重量份)及其各项性能测试结果
Figure PCTCN2019121732-appb-000003
从对比例和实施例可以看出，加入苯乙烯-丙烯酸酯类共聚物作为相容剂，能够最大限度上保证复合材料的韧性，并且得到良好的外观质量。
从对比例2-3和实施例可以看出，苯乙烯-丙烯酸酯类共聚物作为相容剂对于HIPS和聚丙烯酸酯类聚合物的增容作用最好，并且能够大幅度提升光泽度。
从实施例1-5可以看出，添加聚丙烯酸甲酯类聚合物的产品硬度和光泽度综合较高。
从实施例1和实施例2可以看出，以聚苯乙烯复合材料的硬度和加工性能的综合性能作为优先指标时，优选聚丙烯酸酯类聚合物重均分子量Mw为140000g/mol-190000g/mol。
从实施例1和实施例8可以看出，苯乙烯-丙烯酸酯共聚物在优选的范围内，各项性能较好，特别是对于缺口冲击强度有较好保持。

Claims (9)

  1. 一种聚苯乙烯复合材料，其特征在于，按重量份计，包括以下组分：
    聚苯乙烯-聚丁二烯接枝共聚物          100份；
    聚丙烯酸酯类聚合物                  5-70份；
    苯乙烯-丙烯酸酯类共聚物             1-15份。
  2. 根据权利要求1所述的聚苯乙烯复合材料，其特征在于，所述的聚丙烯酸酯类聚合物选自聚丙烯酸甲酯类聚合物、聚丙烯酸乙酯类聚合物、聚丙烯酸丙酯类聚合物、聚丙烯酸丁酯类聚合物、聚丙烯酸戊酯类聚合物中的至少一种；优选的，选自聚丙烯酸甲酯类聚合物、聚丙烯酸乙酯类聚合物中的至少一种。
  3. 根据权利要求1或2所述的聚苯乙烯复合材料，其特征在于，所述的聚丙烯酸酯类聚合物重均分子量Mw为80000g/mol-300000g/mol；优选的，所述的聚丙烯酸酯类聚合物重均分子量Mw为140000g/mol-190000g/mol。
  4. 根据权利要求1所述的聚苯乙烯复合材料，其特征在于，所述的苯乙烯-丙烯酸酯类共聚物选自苯乙烯-丙烯酸酯共聚物、苯乙烯-丁二烯-丙烯酸酯共聚物中的至少一种。
  5. 根据权利要求1或4所述的聚苯乙烯复合材料，其特征在于，所述的苯乙烯-丙烯酸酯类共聚物中丙烯酸酯的含量在20-60％范围内。
  6. 根据权利要求1所述的聚苯乙烯复合材料，其特征在于，所述的聚苯乙烯-聚丁二烯接枝共聚物的重均分子量Mw为80000g/mol至180000g/mol，以聚苯乙烯-聚丁二烯接枝共聚物链段总重量计，聚丁二烯含量在10％至40％。
  7. 根据权利要求1所述的聚苯乙烯复合材料，其特征在于，按重量份计，还包括0-3份的耐划伤剂；所述的耐划伤剂选自硬脂酸盐耐划伤剂、硅酮类耐划伤剂中的至少一种。
  8. 根据权利要求1所述的聚苯乙烯复合材料，其特征在于，按重量份计，还包括0.1-10份的助剂；所述助剂选自阻燃剂、热稳定剂、抗氧剂、阻燃增效剂、抗滴落剂、光稳定剂、增塑剂、填料、着色剂中的至少一种。
  9. 权利要求8所述的聚苯乙烯复合材料的制备方法，其特征在于，包括以下步骤：
    按照配比称量原料，再将聚苯乙烯-聚丁二烯接枝共聚物、聚丙烯酸酯、苯乙烯-丙烯酸酯类共聚物、助剂高速混合均匀，在加入主机中熔融挤出造粒得到聚苯乙烯复合材料，螺杆温度为210-230℃。
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