WO2018121167A1 - 一种聚苯乙烯组合物及其应用 - Google Patents

一种聚苯乙烯组合物及其应用 Download PDF

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WO2018121167A1
WO2018121167A1 PCT/CN2017/113745 CN2017113745W WO2018121167A1 WO 2018121167 A1 WO2018121167 A1 WO 2018121167A1 CN 2017113745 W CN2017113745 W CN 2017113745W WO 2018121167 A1 WO2018121167 A1 WO 2018121167A1
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polystyrene composition
light diffusing
composition according
lubricant
light
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PCT/CN2017/113745
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English (en)
French (fr)
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王亮
李斌
程庆
王林
陈平绪
付锦峰
叶南飚
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金发科技股份有限公司
天津金发新材料有限公司
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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
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • 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
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • 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
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • 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
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • LED Light-emitting diode
  • LED is a solid-state semiconductor device that can directly convert electricity into light, with high luminous efficiency, low power consumption, long life, easy control, maintenance-free, safe and environmentally friendly.
  • a light-diffusing material is a physical phenomenon in which refraction, reflection, and scattering occur when a light encounters two media having different refractive indices (density) in the course of traveling by chemical or physical means, through PMMA, PC, PS, PP.
  • the light diffusing agent is added to the base of the substrate, or the array of micro-features on the surface of the substrate is arranged to artificially adjust the light, and the light is refracted, reflected, and scattered in different directions, thereby changing the traveling path of the light and achieving sufficient incident light. The color is scattered to produce an optical diffusion effect. Widely used in liquid crystal display and LED lighting and imaging display systems.
  • PC polycarbonate
  • polycarbonate is a high molecular polymer containing a carbonate group in a molecular chain.
  • aromatic polycarbonate has been industrially produced and widely used.
  • PC materials have several outstanding advantages: 1, transparent, almost colorless glassy amorphous polymer, has good optical properties; 2, good toughness, PC resin cantilever beam notched impact strength is 600 ⁇ 900J /m; 3, good heat resistance, the heat distortion temperature of pure resin is about 130 ° C; 4, the rigidity is good, the flexural modulus of PC can reach more than 400 MPa. Based on the above advantages, PC is currently the most widely used material for extrusion grade LED lampshades.
  • PC has high processing temperature, poor hydrolysis resistance, must be dried during production, and has poor processing; 2, poor resistance to organic chemicals and scratch resistance; 3, relatively high cost.
  • Patent CN201110453000 and CN201210221227 use matrix resin as polymethacrylate copolymer or transparent polystyrene, which has poor toughness;
  • patent CN201310021103 uses 3-8 parts of K glue and acrylate or silicone light diffusing agent and transparent polyphenylene Ethylene blending granulation to obtain light-diffusing polystyrene material, although its toughness has been improved, but the notched impact strength is less than 30J / m, the actual assembly and use process is easy to break, the practical application is not high.
  • a polystyrene composition comprising the following components:
  • the toughening agent A of the present invention is a high molecular polymer prepared by anionic solution polymerization process using styrene and butadiene as monomers, alkyl lithium as an initiator;
  • the invention adopts the compounding system of the toughening agent A and the toughening agent B of the size and the particle size, can effectively improve the transverse longitudinal toughness of the material, and can meet the impact of the current LED lampshade industry through simulation evaluation. Strength requirements.
  • the silicone light diffusing agent has good shielding property, and the polyacrylic acid light diffusing agent has good light transmittance, and the present invention adopts both When used in combination, it can be used to complement each other, further improving the transmittance and haze of the material, and achieving a balance between light transmission and shielding.
  • the particle size of the light diffusing agent is too large, for example, more than 10 ⁇ m, not only the light diffusion effect is poor, but also the surface gloss of the finished product is significantly reduced; the particle size is too small, for example, less than 1 ⁇ m, the light transmittance is poor, and the dispersion is difficult. . Therefore, the particle diameter of the silicone light diffusing agent of the present invention is 1 ⁇ m to 4 ⁇ m; and the particle diameter of the polyacrylate light diffusing agent is 1 ⁇ m to 10 ⁇ m.
  • the above polystyrene composition of the present invention further comprises 0.1 parts by weight to 0.4 parts of antioxidant, 0.1 part to 1 part of light stabilizer and 0.1 part to 1 part by weight of the lubricant. .
  • the antioxidant is a hindered phenolic antioxidant (such as antioxidant 1010), a phosphite antioxidant (such as antioxidant 168), an amine antioxidant, a sulfur-containing antioxidant or a metal salt.
  • a hindered phenolic antioxidant such as antioxidant 1010
  • a phosphite antioxidant such as antioxidant 168
  • an amine antioxidant such as sulfur-containing antioxidant or a metal salt.
  • One or more of the antioxidants specifically, a mixture of the antioxidant 1010 and the antioxidant 168 in a weight ratio of 1:2;
  • the lubricant is a silicone lubricant, an amide lubricant (such as oleic acid amide, erucamide, etc.), a stearic acid lubricant (such as N, N'-ethylene bisstearamide), a polyolefin. a mixture of one or more of a lubricant or an ester lubricant.
  • the preparation method of the above polystyrene composition of the present invention comprises the steps of: placing each raw material into a high-speed mixer in the above ratio and mixing uniformly, and then feeding the mixture into a twin-screw extruder for kneading, extruding, and drawing , water cooling, pelletizing, that is.
  • the twin-screw extruder can have a length to diameter ratio of 40:1; the barrel temperature is set to: a zone temperature of 80 ° C, a zone temperature of 200 ° C, a three zone temperature of 210 ° C, a four zone temperature of 210 ° C, and five zones. Temperature 210 ° C, six zone temperature 210 ° C, seven zone temperature 210 ° C, eight zone temperature 210 ° C, nine zone temperature 210 ° C, ten zone temperature 210 ° C, head temperature 220 ° C;
  • the invention also provides the use of the above polystyrene composition in an extrusion grade LED lampshade.
  • the present invention has the following beneficial effects:
  • the present invention can effectively improve the transverse direction of the material without affecting the optical effect thereof by using a compounding system of the toughening agent A and the toughening agent B of a large particle size. Resilience, through simulation evaluation, can meet the requirements of the current LED lampshade industry in its production and use;
  • the LED lamp cover material of the invention is relatively low in cost compared with the conventional PC substrate, and is easy to process, and is favorable for popularization and application.
  • Transparent polystyrene resin selected from Total's GPPS 1050;
  • the toughening agent A1 is a butadiene-styrene copolymer having a butadiene weight content of 25% and a rubber particle diameter of 30 nm, which is commercially available;
  • the toughening agent A2 is a butadiene-styrene copolymer having a butadiene weight content of 15% and a rubber particle diameter of 30 nm, which is commercially available;
  • the toughening agent B1 is a butadiene-styrene copolymer having a particle diameter of 1-2 ⁇ m, which is commercially available;
  • the toughening agent B2 is a butadiene-styrene copolymer having a particle diameter of 3-4 ⁇ m, which is commercially available;
  • Silicone light diffusing agent SL-200M (average particle size 1.7 ⁇ m), Samsung SDI Chemistry;
  • Polymethyl methacrylate light diffusing agent MX-500 (average particle size 5 ⁇ m), comprehensive research chemistry;
  • the antioxidant is selected from the mixture of antioxidant 1010 and antioxidant 168 produced by Shanghai Ciba Specialty Chemical Co., Ltd. at a weight ratio of 1:2;
  • the light stabilizer is a mixture of a benzotriazole light absorber and a hindered amine light stabilizer at a weight ratio of 1:1; the lubricant is made of domestically produced ethylene bis-stearic acid amide (EBS), from Beijing. Provided by Shidafeng Trading Co., Ltd.
  • EBS ethylene bis-stearic acid amide
  • the components are added to a high-speed mixer for uniform mixing according to the ratio of Table 1, and then the above mixture is sent to a twin-screw extruder for kneading, extruding, drawing, water cooling, and pelletizing;
  • the twin-screw extruder has a length to diameter ratio of 40:1; the barrel temperature is set to: a zone temperature of 80 ° C, a zone temperature of 200 ° C, a zone temperature of 210 ° C, a zone temperature of 210 ° C, and a zone temperature of 210 ° C.
  • the temperature in the six zones is 210 °C
  • the temperature in the seven zones is 210 °C
  • the temperature in the eight zones is 210 °C
  • the temperature in the nine zones is 210 °C
  • the temperature in the ten zones is 210 °C
  • the temperature in the head is 220 °C
  • the screw speed is 450 rpm.
  • the polystyrene compositions prepared in the above respective examples and comparative examples were extruded into 0.5 mm thick sheets of about 60 mm width by an extrusion grade rheometer according to American Society for Testing and Materials Standard ASTM D1003-61 (1997).
  • the light transmittance test and the haze were measured, and the notched impact strength was tested in accordance with ASTM D256, and the sheet was folded from the transverse direction or the longitudinal direction in the flow direction, and the number of times the desired bending was broken was recorded.
  • the test results are shown in Table 2 below.
  • the present invention adopts a compounding system of the toughening agent A and the toughening agent B of a large and small particle size, and can effectively improve the transverse direction of the material without affecting the optical properties thereof.
  • no toughening agent was added, and the transverse toughness of the material was significantly reduced.
  • a single toughening agent A or a toughening agent B was added, and the transverse toughness of the material was largely different and could not be balanced.

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
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Abstract

本发明公开了一种聚苯乙烯组合物及其应用，包括以下组分：透明聚苯乙烯35份-93份；增韧剂A 5份-40份；增韧剂B 1份-30份；光扩散剂0.1份-3份。本发明通过采用大小粒径的增韧剂A和增韧剂B复配体系，制备的得到的聚苯乙烯组合物在不影响其光学效果的前提下，能有效提高材料的横纵向韧性，通过模拟评估，能满足目前LED灯罩行业对其生产和使用过程中的要求，且相对传统的PC基材的LED灯罩料，成本大幅降低，并且易于加工，有利于普遍推广应用。

Description

一种聚苯乙烯组合物及其应用 技术领域
本发明属于高分子材料领域，具体涉及一种聚苯乙烯组合物及其在挤出级LED灯罩中的应用。
背景技术
发光二极管(LED)，是一种固态的半导体器件，它可以直接把电转化为光，光效高、耗电少，寿命长、易控制、免维护、安全环保。2010年国家明确了节能环保、新能源、新材料等作为重点发展的战略性新兴产业，并颁布了《半导体照明节能产业发展意见》，要求通过集聚创新资源，突出技术进步，攻克关键瓶颈，推进LED产业的发展。
但LED发出的光类似于点光源，直视刺眼，所以LED普遍都配光扩散材料制成的灯罩，在LED光线到达灯罩时，将光线散开去，使其点亮后看不见LED光源，光线柔和。
光扩散材料是通过化学或物理的手段，利用光线在行进途中遇到两个折射率(密度)相异的介质时，发生折射、反射与散射的物理现象，通过在PMMA、PC、PS、PP等基材基础中添加光扩散剂、或者通过基材表面的微特征结构的阵列排列人为调整光线、使光线发生不同方向的折射、反射、与散射，从而改变光的行进路线，实现入射光充分散色以此产生光学扩散的效果。广泛应用在液晶显示与LED照明及成像显示系统中。
PC(聚碳酸酯)是分子链中含有碳酸酯基的高分子聚合物，目前芳香族聚碳酸酯获得了工业化生产，应用广泛。PC材料有几个突出优点：1，透明性好，几乎无色的玻璃态的无定形聚合物，有很好的光学性；2，韧性好，PC树脂的悬臂梁缺口冲击强度为600～900J/m；3，耐热性好，纯树脂的热变形温度大约为130℃；4，刚性好，PC的弯曲模量可达400MPa以上。基于以上优点，PC是目前挤出级LED灯罩使用最广泛的材料。
但PC应用于LED灯罩也有其不足：1，PC加工温度高，耐水解性差，生产时必须烘干，加工型差；2，耐有机化学品性差，不耐刮痕；3，相对成本高昂。
PS(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，是一种无毒、无臭、无色透明的热塑性塑料，其制品具有极高的透明度，透光率可达90％以上，电绝缘性能好，易着色，加工流动性好，刚性好及耐化学腐蚀性好等，并且其成本低廉，其原料价格几乎只有PC的50％。普通聚苯乙烯如能用于挤出级LED灯罩，几乎可以克服现有PC材料的所有缺陷，但其一直未能在该领域广泛推广开的主要原因在于其性脆，韧性低。LED灯罩在安装及运输过程中会在不同方向受到挤压或拉伸外力，普通透明PS或K胶增韧的透明 PS在此条件下极易开裂，无法满足生产及使用要求。
专利CN201110453000和CN201210221227中采用基体树脂为聚甲基丙烯酸酯共聚物或透明聚苯乙烯，其韧性较差；专利CN201310021103中采用3-8份K胶以及丙烯酸酯或有机硅光扩散剂与透明聚苯乙烯共混造粒制得光扩散聚苯乙烯材料，其韧性虽有一定提升，但缺口冲击强度不到30J/m，实际组装及使用过程中易折断，实际应用性不高。
发明内容
为了解决目前LED灯罩材料存在的不足，本发明的目的在于提供一种聚苯乙烯组合物，该聚苯乙烯组合物能在不影响其光学效果的前提下，能有效提高材料的横纵向韧性。
本发明是通过以下技术方案实现的：
一种聚苯乙烯组合物，按重量份数计，包括以下组分：
Figure PCTCN2017113745-appb-000001
所述增韧剂A为丁二烯-苯乙烯共聚物，基于增韧剂A的总重量，增韧剂A中丁二烯的重量含量为15-30％，优选丁二烯的重量含量为20-25％；所述增韧剂A的丁二烯橡胶相粒径为20nm-60nm。
本发明所述的增韧剂A是以苯乙烯和丁二烯为单体，烷基锂为引发剂，阴离子溶液聚合工艺制备的高分子聚合物；
所述增韧剂B为丁二烯-苯乙烯共聚物，所述增韧剂B的丁二烯橡胶相粒径为0.5μm-4μm，优选粒径为1μm-2μm。
本发明所述的增韧剂B是以丁二烯或丁二烯、苯乙烯为单体，以碱金属、烷基锂或其他负离子聚合为引发剂制备的高分子聚合物。
本发明根据银纹-剪切带理论，采用大小粒径的增韧剂A和增韧剂B复配体系，能有效提高材料的横纵向韧性，通过模拟评估，能满足目前LED灯罩行业对冲击强度的要求。
优选的，所述增韧剂A与增韧剂B的质量比为1：2-5：1，优选为1：1-3：1。
所述光扩散剂为有机硅光扩散剂和聚丙烯酸酯类光扩散剂的的复配物，所述有机硅光扩散剂和聚丙烯酸酯类光扩散剂的质量比为2：1-1：5，优选为1：1-1：3。
有机硅光扩散剂遮蔽性好，聚丙烯酸酯类光扩散剂的透光性好，本发明通过将两者 复配使用，能取长补短，进一步提高了材料的透光度和雾度，可以实现透光性和遮蔽性的均衡。
有机硅光扩散剂的具体实例可以列举为：日本信越公司的KMP590，美国道康宁公司的EP-2720，韩国ABC公司的E+340，三星SDI化学的SL-200M等；
聚丙烯酸酯类光扩散剂的具体实例可以列举为：日本钟渊公司的MP59，日本积水公司的EXM系列和SBX系列，综研化学的MX-500等；
光扩散剂的粒径太大，例如超过10μm，不仅光扩散效果差，而且会导致成品制件表面光泽度明显降低；粒径太小，例如低于1μm，透光率较差，同时分散困难。因此，本发明所述有机硅光扩散剂的粒径为1μm-4μm；所述聚丙烯酸酯类光扩散剂的粒径为1μm-10μm。
根据实际性能需要，本发明上述的聚苯乙烯组合物，按重量份数计，还包括0.1份-0.4份的抗氧剂、0.1份-1份光稳定剂和0.1份-1份的润滑剂。
所述抗氧剂为受阻酚类抗氧剂(如抗氧剂1010)、亚磷酸脂类抗氧剂(如抗氧剂168)、胺类抗氧剂、含硫类抗氧剂或金属盐类抗氧剂中的一种或几种，具体可以选用抗氧剂1010和抗氧剂168按重量比1:2复配而成的混合物；
所述光稳定剂为苯并三唑类光吸收剂或受阻胺类光稳定剂中的一种或几种的混合物，具体可以选用苯并三唑类光吸收剂和受阻胺类光稳定剂按重量比1：1复配而成的混合物；
所述润滑剂为硅酮类润滑剂、酰胺类润滑剂(如油酸酰胺、芥酸酰胺等)、硬脂酸类润滑剂(如N,N’-乙撑双硬脂酰胺)、聚烯烃类润滑剂或酯类润滑剂中的一种或几种的混合物。
本发明上述聚苯乙烯组合物的制备方法，包括如下步骤：将各原料按上述比例置入高速混合机混合均匀，然后将上述混合物送入双螺杆挤出机中混炼、挤出、拉条、水冷、切粒，即得。
其中，双螺杆挤出机的长径比可以为40:1；螺筒温度设定为：一区温度80℃，二区温度200℃，三区温度210℃，四区温度210℃，五区温度210℃，六区温度210℃，七区温度210℃，八区温度210℃，九区温度210℃，十区温度210℃，机头温度220℃；螺杆转速为450转/分钟。
本发明还提供了上述聚苯乙烯组合物在挤出级LED灯罩中的应用。
与现有技术相比，本发明具有如下有益效果：
(1)本发明通过采用大小粒径的增韧剂A和增韧剂B复配体系，制备的得到的聚苯乙烯组合物在不影响其光学效果的前提下，能有效提高材料的横纵向韧性，通过模拟评估，能满足目前LED灯罩行业对其生产和使用过程中的要求；
(2)本发明相对传统的PC基材的LED灯罩料，成本大幅降低，并且易于加工，有利于普遍推广应用。
具体实施方式
下面给出实施例以对本发明进行具体的描述，但不限于此。
现对实施例及对比例所用的原材料做如下说明，但不限于这些材料：
透明聚苯乙烯树脂选用道达尔的GPPS 1050；
增韧剂A1选用丁二烯重量含量为25％，橡胶粒径为30nm的丁二烯-苯乙烯共聚物，市购；
增韧剂A2选用丁二烯重量含量为15％，橡胶粒径为30nm的丁二烯-苯乙烯共聚物，市购；
增韧剂A3选用丁二烯重量含量为35％，橡胶粒径为60nm的丁二烯-苯乙烯共聚物，市购；
增韧剂B1选用粒径为1-2μm的丁二烯-苯乙烯共聚物，市购；
增韧剂B2选用粒径为3-4μm的丁二烯-苯乙烯共聚物，市购；
增韧剂B3选用粒径为8-10μm的丁二烯-苯乙烯共聚物，市购；
光扩散剂：
有机硅光扩散剂SL-200M(平均粒径为1.7μm)，三星SDI化学；
聚甲基丙烯酸甲酯光扩散剂MX-500(平均粒径为5μm)，综研化学；
抗氧剂选用上海汽巴精化公司生产的抗氧剂1010和抗氧剂168按重量比1:2复配而成的混合物；
光稳定剂选用苯并三唑类光吸收剂和受阻胺类光稳定剂按重量比1：1复配而成的混合物；润滑剂选用国产的乙撑双硬脂酸酰胺(EBS)，由北京实达丰商贸有限公司提供。
实施例1-17和对比例1-3：
将各组分按表1配比将各组分加入高速混合机中进行均匀混合，然后将上述混合物送入双螺杆挤出机中混炼、挤出、拉条、水冷、切粒；其中，双螺杆挤出机的长径比为40:1；螺筒温度设定为：一区温度80℃，二区温度200℃，三区温度210℃，四区温度210℃，五区温度210℃，六区温度210℃，七区温度210℃，八区温度210℃，九区温度210℃，十区温度210℃，机头温度220℃；螺杆转速为450转/分钟。
表1 实施例和对比例聚苯乙烯组合物组成(重量份)
Figure PCTCN2017113745-appb-000002
续表1
Figure PCTCN2017113745-appb-000003
将上述各实施例及对比例所制得的聚苯乙烯组合物用挤出级流变仪挤出成0.5mm厚、约60mm宽的薄片，按照美国材料实验协会标准ASTM D1003-61(1997)测试透光率测试及雾度，缺口冲击强度按ASTM D256标准进行测试，并从沿流动方向的横向或纵向折叠该薄片，记录折断所需弯折的次数。测试结果见下表2。
表2实施例和对比例的性能测试结果
Figure PCTCN2017113745-appb-000004
续表2
Figure PCTCN2017113745-appb-000005
由各实施例与对比例的测试结果可以看出，本发明采用大小粒径的增韧剂A和增韧剂B复配体系，在不影响其光学性能的前提下，能有效提高材料的横纵向韧性，且横纵向韧性较为均衡。对比例1不添加增韧剂，材料的横纵向韧性显著降低；对比例2-3中添加单一增韧剂A或增韧剂B，材料的横纵向韧性差异较大，不能均衡。

Claims (9)

  1. 一种聚苯乙烯组合物，其特征在于，按重量份数计，包括以下组分：
    Figure PCTCN2017113745-appb-100001
  2. 根据权利要求1所述的聚苯乙烯组合物，其特征在于，所述增韧剂A为丁二烯-苯乙烯共聚物；基于增韧剂A的总重量，增韧剂A中丁二烯的重量含量为15-30％，优选丁二烯的重量含量为20-25％；所述增韧剂A的丁二烯橡胶相粒径为20nm-60nm。
  3. 根据权利要求1所述的聚苯乙烯组合物，其特征在于，所述增韧剂B为丁二烯-苯乙烯共聚物；所述增韧剂B的丁二烯橡胶相粒径为0.5μm-4μm，优选粒径为1μm-2μm。
  4. 根据权利要求1所述的聚苯乙烯组合物，其特征在于，所述增韧剂A与增韧剂B的质量比为1：2-5：1，优选为1：1-3：1。
  5. 根据权利要求1所述的聚苯乙烯组合物，其特征在于，所述光扩散剂为有机硅光扩散剂和聚丙烯酸酯类光扩散剂的复配物，所述有机硅光扩散剂和聚丙烯酸酯类光扩散剂的质量比为2：1-1：5，优选为1：1-1：3。
  6. 根据权利要求5述的聚苯乙烯组合物，其特征在于，所述有机硅光扩散剂的粒径为1μm-4μm；所述聚丙烯酸酯类光扩散剂的粒径为1μm-10μm。
  7. 根据权利要求1所述的聚苯乙烯组合物，其特征在于，按重量份数计，还包括0.1份-0.4份的抗氧剂、0.1份-1份光稳定剂和0.1份-1份的润滑剂。
  8. 根据权利要求1所述的聚苯乙烯组合物，其特征在于，所述抗氧剂为受阻酚类抗氧剂、亚磷酸脂类抗氧剂、胺类抗氧剂、含硫类抗氧剂或金属盐类抗氧剂中的一种或几种；所述光稳定剂为苯并三唑类光吸收剂或受阻胺类光稳定剂中的一种或几种的混合物；所述润滑剂为硅酮类润滑剂、酰胺类润滑剂、硬脂酸类润滑剂、聚烯烃类润滑剂或酯类润滑剂中的一种或几种的混合物。
  9. 根据权利要求1-8任一项所述的聚苯乙烯组合物在挤出级LED灯罩中的应用。
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