WO2021120883A1 - 一种聚丙烯组合物 - Google Patents

一种聚丙烯组合物 Download PDF

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Publication number
WO2021120883A1
WO2021120883A1 PCT/CN2020/125087 CN2020125087W WO2021120883A1 WO 2021120883 A1 WO2021120883 A1 WO 2021120883A1 CN 2020125087 W CN2020125087 W CN 2020125087W WO 2021120883 A1 WO2021120883 A1 WO 2021120883A1
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Prior art keywords
polypropylene
parts
molecular weight
weight
resin
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PCT/CN2020/125087
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English (en)
French (fr)
Inventor
李伟
陈嘉杰
黄险波
叶南飚
俞飞
雷亮
姚程
钱志军
赖昂
李志鹏
吴国峰
杨波
罗忠富
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金发科技股份有限公司
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Publication of WO2021120883A1 publication Critical patent/WO2021120883A1/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
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • 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
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

Definitions

  • the invention belongs to the technical field of polymer materials, and specifically relates to a polypropylene composition.
  • Polypropylene (PP) material has the advantages of low density, good comprehensive performance and low price. It fits the light weight and environmental protection development trend of the automotive industry, and has been gradually developed new application scenarios for automotive parts. As a new branch of the traditional automobile field, the new energy automobile industry has even more pursuit of lightweight vehicles.
  • the tailgate and fender materials of new energy vehicles were originally made of steel or aluminum alloy, but are gradually being replaced by plastic tailgates and aluminum alloys. Replaced by plastic fender material.
  • the biggest advantage of plastic parts over metal parts is that they are light.
  • the tailgate and fender materials are non-stressed structural parts. They will not encounter large stress or strain environments in the daily working conditions of automobiles, and they have the basics of plasticization. premise.
  • Polypropylene as the lightest plastic among commonly used plastics, has become the best choice for plasticizing tailgates and fenders.
  • general polypropylene materials have several obvious disadvantages compared with metal materials.
  • the second is that the polypropylene material used as the material for the tailgate and fender of the car needs to be sprayed to achieve a consistent appearance with the metal car body. If the flow marks appearing during the injection molding process are too obvious, the spraying will not be completely covered, which will result in the parts.
  • the common method to reduce the linear expansion coefficient of polypropylene materials is to add fillers with a high diameter-to-thickness ratio for improvement.
  • Patent application number: CN106147034A the polypropylene material uses: polypropylene 50%-70%, thermoplastic elastomer 1%-20%, talc 0%-30%, phlogopite powder 5%-30%, composite light and heat stable It is prepared from 0.5% to 5% of an agent, 0.5% to 3% of a targeted nano-synergy function masterbatch, and 0 to 5% of a colorant.
  • the technical solution improves the dispersion of the phlogopite powder in the polypropylene material by targeting the nano-enhanced functional masterbatch and adopts the method of powder side feeding, and realizes the effect of reducing the linear expansion coefficient.
  • the polypropylene material obtained by this method has rough and uneven appearance, and the appearance after spraying cannot meet the requirements of automobile appearance.
  • the polypropylene uses polypropylene 95-53%, heat stabilizer 0-1%, lubricant 0-1%, toughening agent 0-20%, interface compatibilizer 0-5%, silica fume 5-20% of stone, wherein the wollastonite is acicular wollastonite with an aspect ratio of 10-30 and a powder with an aspect ratio of ⁇ 5, and the ratio of wollastonite is 1/4-4 Mixed mixture.
  • the technical scheme adopts the compound of wollastonite with special aspect ratio and adopts the method of side feeding to reduce the linear expansion coefficient.
  • the invention needs to add a side feeding device, which has high requirements on equipment, which is not conducive to realization.
  • Patent application number: CN108084562A the polypropylene uses 15 ⁇ 65 parts by weight of polypropylene, 10 ⁇ 25 parts by weight of appearance modifier, 5 ⁇ 15 parts by weight of glass beads, 5 ⁇ 10 parts by weight of toughening agent, and 15 ⁇ 35 parts by weight. Parts by weight, 1-5 parts by weight of compatibilizer, and 0.1-2 parts by weight of optional auxiliary agent.
  • This method uses glass beads and an appearance modifier to improve the appearance.
  • the high cost of this polypropylene is not conducive to industrialization.
  • the polypropylene is composed of polypropylene 35%-98.99%, glass fiber 1%-50%, modified polyolefin 0.01%-15%, and auxiliary agent: 0.16%-0.8%.
  • This invention has the good appearance of glass fiber polypropylene resin, but does not have the good appearance characteristics of mineral-filled polypropylene resin.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and provide a polypropylene composition.
  • the technical solution adopted by the present invention is: a polypropylene composition comprising the following components by weight: 40 to 55 parts of copolymerized polypropylene resin, 0 to 10 parts of low density polyethylene resin, and ethylene octene 5-20 parts of copolymer and 25-35 parts of talc; the molecular weight distribution of the copolymerized polypropylene resin is less than or equal to 4.5.
  • the polypropylene composition of the present invention adopts a copolymerized polypropylene resin with a narrow molecular weight distribution, which can effectively reduce the content of low molecular weight polypropylene in the copolymerized polypropylene, can weaken the crystallization tendency of polypropylene polymer, and can reduce the linear expansion of polypropylene materials. It can also improve the appearance during molding, and all raw materials can be input from the main feed port, which can be applied to the outer panel of the polypropylene tailgate and polypropylene fender of automobiles to help the automobile lightweight business.
  • the molecular weight distribution of the copolymerized polypropylene resin is ⁇ 3.
  • the weight average molecular weight of the copolymerized polypropylene resin is 60,000-75,000, the isotacticity of the copolymerized polypropylene resin is 85-93%, and the atactic polypropylene (aPP) in the copolymerized polypropylene resin
  • the weight percentage is 0.5 to 1.5%, and the weight percentage of ethylene propylene rubber (EP) in the copolymer polypropylene resin is 6.5 to 13.5%.
  • the copolymerized polypropylene resin is preferably prepared by the peroxide method, and the molecular weight of the ethylene-propylene rubber phase prepared by the peroxide method is larger than the weight average molecular weight of the hydrogen modulation method.
  • the molecular weight of the ethylene octene copolymer has a bimodal distribution, the weight average molecular weight of the low molecular weight component in the bimodal is 60,000 to 80,000, and the peak area is 38 to 41%; the high molecular weight component in the bimodal is The weight average molecular weight is 150,000 to 170,000, and the peak area is 52 to 55%.
  • the ethylene octene copolymer of the present invention adopts an ethylene octene copolymer with a bimodal molecular weight distribution, and when combined with the copolymerized polypropylene, the appearance state during molding can be improved, so that the prepared polypropylene material has a good injection molding appearance .
  • the branching degree of the low-density polyethylene resin is 11.0-15.0.
  • the use of the low-density polyethylene resin with this degree of branching can reduce the regularity of its chain segments and thereby reduce crystallization.
  • the low-density polyethylene resin is 2-10 parts.
  • the low-density polyethylene with a branching degree of 11.0-15.0 can affect the crystallization behavior, reduce the crystallization rate and crystallinity, and then reduce the linear expansion coefficient of the polypropylene material when the above-mentioned addition amount is used.
  • the weight average molecular weight of the low-density polyethylene resin is 300,000-350,000.
  • the content of methyl branches is 40.0-55.0%
  • the content of ethyl branches is 25.0-35.0%
  • propyl and branches containing more than 4 carbons The content is 20.0-25.0%.
  • the particle size of the talc powder is 5000-10000 mesh.
  • the polypropylene composition further contains 0-0.6 parts of antioxidant.
  • the antioxidant is at least one of 1010, AO-330, 4213A, 3114, 168, PEP-36 and 627AV.
  • the present invention provides a polypropylene composition.
  • the polypropylene composition of the present invention adopts a copolymer polypropylene resin with a narrow molecular weight distribution, which can effectively reduce the content of low molecular weight polypropylene in the copolymer polypropylene. It can make polypropylene polymer crystals tend to weaken, can reduce the linear expansion coefficient of polypropylene materials, and all raw materials can be input from the main feed port, which can be applied to automobile polypropylene tailgates and polypropylene fender outer panels to help cars Lightweight business.
  • the antioxidant in the examples and comparative examples is a mixture of 1010 and 168, wherein the weight ratio of 1010 and 168 is 1:1; the particle size of the talc powder is 5000 mesh.
  • the preparation method of the polypropylene composition described in the examples and comparative examples includes the following steps:
  • the copolymerized polypropylene resin, low-density polyethylene resin, ethylene octene copolymer, talcum powder, and antioxidant are mixed uniformly and then added to the twin-screw extruder for melting and kneading.
  • the melting and kneading temperature is 190-210°C.
  • the screw rotation speed is 450-550 rpm, extrusion granulation is performed, and the polypropylene composition is obtained.
  • Injection molding mold Archimedes ring mold, ISO mechanics mold.
  • Archimedes ring mould length 1000mm, width 50mm, thickness 2mm.
  • Injection molding machine model Borch BS320-III.
  • Injection conditions The injection temperature is 200°C in the whole area.
  • the injection pressure is 70% in the whole area, the holding pressure is 70% in the whole area, and the cooling time is 8 seconds.
  • ISO mechanical mold The size of tensile test specimens refers to the standard ISO 527.
  • Injection molding machine model Borch BS80-III.
  • Injection conditions The injection temperature is 200°C in the whole area.
  • the injection pressure is 45% in the whole area, the holding pressure is 45% in the whole area, and the cooling time is 15 seconds.
  • test methods involved in the examples and comparative examples are as follows:
  • Coefficient of linear expansion After the injection molded stretch spline is adjusted in a standard environment for 24 hours, a rectangular sample with a length of about 10mm in the middle of the gauge length is cut with a tool, and tested according to the standard ISO 11359-2.
  • the test temperature is the test temperature range: -40°C ⁇ 100°C, and the temperature rise rate is 5°C/min.
  • Flow mark appearance position After injection molding, the Archimedes ring sample, visually observe the length and distance corresponding to the flow mark, at least 3 testers, the data is taken as the mathematical average, and the decimal point is reserved for single digits. If no flow marks are visible to the naked eye, mark "No flow marks".
  • the performance indicators of the copolymer polypropylene resin used in the examples and comparative examples are shown in Table 3, the performance indicators of the low-density polyethylene resin used in the examples and comparative examples are shown in Table 4, and the ethylene octene used in the examples and comparative examples
  • the performance index of the copolymer is shown in Table 5.

Abstract

本发明公开了一种聚丙烯组合，包含以下重量份的组分：共聚聚丙烯树脂40～55份、低密度聚乙烯树脂0～10份、乙烯辛烯共聚物5～20份和滑石粉25～35份；所述共聚聚丙烯树脂的分子量分布≤4.5。本发明所述聚丙烯组合物采用窄分子量分布的共聚聚丙烯树脂，能有效降低共聚聚丙烯中低分子量聚丙烯部分含量，可使聚丙烯聚合物结晶趋向减弱，可降低聚丙烯材料的线性膨胀系数，并且原料均可以采用主喂料口投入，可应用于汽车聚丙烯尾门和聚丙烯翼子板外板，助力汽车轻量化事业。

Description

一种聚丙烯组合物 技术领域
本发明属于高分子材料技术领域，具体涉及一种聚丙烯组合物。
背景技术
聚丙烯(Polypropylene，简称PP)材料具有密度低、综合性能好且价格便宜等优势，贴合汽车行业的轻量化、环保化发展趋势，被逐渐开发出新的汽车部品应用场景。新能源汽车行业作为传统汽车领域的一个新分支，对于汽车轻量化的追求更为甚之，如新能源车的尾门、翼子板材料原为钢或铝合金，正逐步被塑料尾门和塑料翼子板材料所替代。塑料件对于金属件的最大优势在于质轻，尾门和翼子板材料属于非受力结构件，其在汽车日常工况中并不会遭遇较大的应力或应变环境，具备塑料化的基本前提。聚丙烯作为常用塑料中密度最轻的塑料就成为了尾门和翼子板塑料化的最佳选材。但一般聚丙烯材料对比金属材料有几个比较明显的劣势：一是聚丙烯材料作为半结晶型高分子聚合物材料，在冷热交变的应用环境下容易出现尺寸的变化，其变化幅度比金属高，容易造成装配缝隙过大，装配制件出现干涉等问题。二是聚丙烯材料作为汽车尾门和翼子板材料需要进行喷涂处理以达到与金属车身一致的外观，在注塑过程中出现的流痕若过于明显的话喷涂并不能完全遮盖，这将导致制件表面出现明显的类似于“虎皮”状的流痕，影响汽车外观。基于以上汽车的发展趋势和应用场景，一款能够应用在汽车尾门和翼子板的具备低线性膨胀系数和良外观的聚丙烯组合物材料具有重要的开发意义和广阔的应用前景。
降低聚丙烯材料的线性膨胀系数的常用方法是添加高径厚比的填料进行改善。申请专利号：CN106147034A，该聚丙烯材料采用：聚丙烯50％-70％、热塑性弹性体1％-20％、滑石粉0％-30％、金云母粉5％-30％、复合光热稳定剂0.5％-5％、靶向纳米增效功能母料0.5％-3％、着色剂0-5％制备。该技术方案通过靶向纳米增效功能母粒且采取粉体侧喂的方法，提高金云母粉在聚丙烯材料中的分散，实现降低线性膨胀系数的效果。该方法制得的聚丙烯材料外观粗 糙不平，喷涂后外观不能满足汽车外观的要求。申请专利号CN102504411A，该聚丙烯采用聚丙烯95-53％、热稳定剂0-1％、润滑剂0-1％、增韧剂0-20％、界面相容剂0-5％、硅灰石5-20％，其中，所述硅灰石为长径比在10～30之间的针状硅灰石与长径比≤5的粉状，硅灰石按1/4～4的比例混合的混合物。技术方案采用特殊长径比的硅灰石复配且采用侧喂加入的方式，降低线性膨胀系数。该发明需要增加侧喂装置，对设备的要求较高，不利于实现。
实现良外观聚丙烯材料的常用方法是加入外观改良剂。申请专利号：CN108084562A，该聚丙烯采用聚丙烯15～65重量份、外观改良剂10～25重量份、玻璃微珠5～15重量份、增韧剂5～10重量份、填充剂15～35重量份、相容剂1～5重量份、可选择的助剂0.1～2重量份。该方法通过玻璃微珠和外观改良剂共同改善外观。但此聚丙烯成本较高，不利于工业化推广。申请专利号：CN105102529A，该聚丙烯由聚丙烯35％-98.99％、玻璃纤维1％-50％、改性聚烯烃0.01％-15％，助剂：0.16％-0.8％组成。该发明具有玻璃纤维聚丙烯树脂的良外观，但不具备矿物填充聚丙烯树脂的良外观特性。
综上所述，目前针对汽车聚丙烯尾门和聚丙烯翼子板外板的低线性膨胀系数和良外观聚丙烯产品及专利少有报道。
发明内容
本发明的目的在于克服现有技术存在的不足之处而提供一种聚丙烯组合物。
为实现上述目的，本发明采取的技术方案为：一种聚丙烯组合物，包含以下重量份的组分：共聚聚丙烯树脂40～55份、低密度聚乙烯树脂0～10份、乙烯辛烯共聚物5～20份和滑石粉25～35份；所述共聚聚丙烯树脂的分子量分布≤4.5。
本发明所述聚丙烯组合物采用窄分子量分布的共聚聚丙烯树脂，能有效降低共聚聚丙烯中低分子量聚丙烯部分含量，可使聚丙烯聚合物结晶趋向减弱，可降低聚丙烯材料的线性膨胀系数，且能改善成型时的外观，并且原料均可以采用主喂料口投入，可应用于汽车聚丙烯尾门和聚丙烯翼子板外板，助力汽车轻量化事业。
更优选地，所述共聚聚丙烯树脂的分子量分布≤3。
优选地，所述共聚聚丙烯树脂的重均分子量为60000～75000，所述共聚聚丙烯树脂的等规度为85～93％，无规聚丙烯(aPP)在所述共聚聚丙烯树脂中的重量百分含量为0.5～1.5％，乙丙橡胶(EP)在所述共聚聚丙烯树脂中的重量百分含量为6.5～13.5％。
所述共聚聚丙烯树脂优选采用过氧化物法制得，过氧化物法制得的乙丙橡胶相分子量较氢调法的重均分子量更大。
优选地，所述乙烯辛烯共聚物的分子量呈双峰分布，双峰中的低分子量组分的重均分子量为60000～80000，峰面积为38～41％；双峰中的高分子量组分的重均分子量为150000～170000，峰面积为52～55％。本发明所述乙烯辛烯共聚物采用分子量呈双峰分布的乙烯辛烯共聚物，与所述共聚聚丙烯配合能够提升成型时的外观状态，使制得的聚丙烯材料具有良好的注塑成型外观。
优选地，所述低密度聚乙烯树脂支化度为11.0～15.0。采用该支化度的低密度聚乙烯树脂，能够降低其链段规整度从而降低结晶。
优选地，所述低密度聚乙烯树脂为2～10份。支化度为11.0～15.0的低密度聚乙烯采用上述加入量能够影响结晶行为，降低结晶速率和降低结晶度，进而降低聚丙烯材料的线性膨胀系数。
优选地，所述低密度聚乙烯树脂的重均分子量为300000～350000。
优选地，所述低密度聚乙烯树脂的支链中，甲基支链的含量为40.0～55.0％，乙基支链的含量为25.0～35.0％，丙基及含4个碳以上的支链含量为20.0～25.0％。
优选地，所述滑石粉的粒径为5000～10000目。
优选地，所述聚丙烯组合物还包含抗氧剂0～0.6份。
优选地，所述抗氧剂为1010、AO-330、4213A、3114、168、PEP-36和627AV中的至少一种。
本发明的有益效果在于：本发明提供了一种聚丙烯组合物，本发明所述聚丙烯组合物采用窄分子量分布的共聚聚丙烯树脂，能有效降低共聚聚丙烯中低分子量聚丙烯部分含量，可使聚丙烯聚合物结晶趋向减弱，可降低聚丙烯材料的线性膨胀系数，并且原料均可以采用主喂料口投入，可应用于汽车聚丙烯尾门和聚丙烯翼子板外板，助力汽车轻量化事业。
具体实施方式
为更好的说明本发明的目的、技术方案和优点，下面将结合具体实施例对本发明作进一步说明。
实施例和对比例中所述抗氧剂为1010和168的混合物，其中，1010和168的重量之比为：1：1；所述滑石粉的粒径为5000目。
实施例和对比例中所述聚丙烯组合物的制备方法包括以下步骤：
将共聚聚丙烯树脂、低密度聚乙烯树脂、乙烯辛烯共聚物、滑石粉、抗氧剂混合均匀后加入双螺杆挤出机中，进行熔融混炼，熔融混炼温度为190～210℃，螺杆转速为450～550转/分，挤出造粒，得到聚丙烯组合物。
注塑成型模具：阿基米德环模具、ISO力学模具。
阿基米德环模具：长度1000mm，宽度50mm，厚度为2mm。注塑机型号：博创BS320-III。注塑条件：注塑温度全区200℃。注塑压力全区70％，保压压力全区70％，冷却时间8秒。
ISO力学模具：拉伸测试样条尺寸参考标准ISO 527。注塑机型号：博创BS80-III。注塑条件：注塑温度全区200℃。注塑压力全区45％，保压压力全区45％，冷却时间15秒。
实施例和对比例中涉及的测试方法如下：
线性膨胀系数：注塑后的拉伸样条在标准环境调节24h后，用刀具裁剪标 距正中间区域约10mm长度的长方矩形样品，根据标准ISO 11359-2测试。测试温度为测试温度范围：-40℃～100℃，温度上升速度为5℃/min。
流痕出现位置：注塑后的阿基米德环样品，用目视观察开始出现流痕对应的长度距离，测试人员至少3人，数据取数学平均值，小数点保留个位整数位。若肉眼未见流痕，则标记“未见流痕”。
实施例1～16和对比例1～5所述聚丙烯组合物的配方见表1和表2。
表1实施例1～9和对比例1～2所述聚丙烯组合物配方(重量份)和测试结果
Figure PCTCN2020125087-appb-000001
表2实施例10～16和对比例3～5所述聚丙烯组合物配方(重量份)和测试结果
Figure PCTCN2020125087-appb-000002
注：表1和表2中“-”表示未添加该物质。
实施例和对比例所使用的共聚聚丙烯树脂的性能指标见表3，实施例和对比例所使用的低密度聚乙烯树脂的性能指标见表4，实施例和对比例所使用的乙烯辛烯共聚物的性能指标见表5。
表3实施例和对比例所使用的共聚聚丙烯树脂的性能指标
共聚聚丙烯树脂牌号 1# 2# 3# 4#
制备工艺 过氧化物法 过氧化物法 过氧化物法 氢调法
重均分子量 67000～70000 70000～73000 70000～75000 45000～48000
分子量分布 3.0 4.5 5.5 6.5
等规度 88.5 90.3 89.5 95.0
aPP含量(％) 1.3 1.4 1.2 0.3
EP含量(％) 9.6 8.5 9.5 5.0
表4实施例和对比例所使用的低密度聚乙烯树脂的性能指标
Figure PCTCN2020125087-appb-000003
表5实施例和对比例所使用的乙烯辛烯共聚物的性能指标
乙烯辛烯共聚物牌号 1# 2#
重均分子量 120000～130000 96000～106000
峰1重均分子量 70000～71000 94000～95000
分子峰1峰面积百分比(％) 39.5 93.5
峰2重均分子量 160000～161000 ——
分子峰2峰面积百分比(％) 53.5 ——
针对汽车聚丙烯尾门和聚丙烯翼子板外板而言，当线性膨胀系数≤3.5×10 -5时，尺寸变化较小，其尺寸宏观变化可以满足要求，否则尺寸变化明显，容易出现装配缝隙过大，装配制件出现干涉等问题。
从表1和表2的测试结果可以看出，采用分子量分布≤4.5的共聚聚丙烯树 脂，其具有更低的线性膨胀系数；采用支化度大于11的低密度聚乙烯树脂的线性膨胀系数更低，并且，当低密度聚乙烯树脂大于2份时，能有效降低聚乙烯树脂的线性膨胀系数。采用分子量分布小于4.5的共聚聚丙烯树脂和双峰分布的乙烯辛烯共聚物配合能制得实现具有低密度聚乙烯树脂，并且不出现流痕，注塑外观较佳。
最后所应当说明的是，以上实施例仅用以说明本发明的技术方案而非对本发明保护范围的限制，尽管参照较佳实施例对本发明作了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的实质和范围。

Claims (10)

  1. 一种聚丙烯组合物，其特征在于，包含以下重量份的组分：共聚聚丙烯树脂40～55份、低密度聚乙烯树脂0～10份、乙烯辛烯共聚物5～20份和滑石粉25～35份；所述共聚聚丙烯树脂的分子量分布≤4.5。
  2. 如权利要求1所述聚丙烯组合物，其特征在于，所述共聚聚丙烯树脂的重均分子量为60000～75000，所述共聚聚丙烯树脂的等规度为85～93％，无规聚丙烯在所述共聚聚丙烯树脂中的重量百分含量为0.5～1.5％，乙丙橡胶在所述共聚聚丙烯树脂中的重量百分含量为6.5～13.5％。
  3. 如权利要求1所述聚丙烯组合物，其特征在于，所述乙烯辛烯共聚物的分子量呈双峰分布，双峰中的低分子量组分的重均分子量为60000～80000，峰面积为38～41％；双峰中的高分子量组分的重均分子量为150000～170000，峰面积为52～55％。
  4. 如权利要求1所述聚丙烯组合物，其特征在于，所述低密度聚乙烯树脂支化度为11.0～15.0。
  5. 如权利要求5所述聚丙烯组合物，其特征在于，所述低密度聚乙烯树脂为2～10重量份。
  6. 如权利要求1所述聚丙烯组合物，其特征在于，所述低密度聚乙烯树脂的重均分子量为300000～350000。
  7. 如权利要求1所述聚丙烯组合物，其特征在于，所述低密度聚乙烯树脂的支链中，甲基支链的重量百分含量为40.0～55.0％，乙基支链的重量百分含量为25.0～35.0％，丙基及含4个碳以上的支链的重量百分含量为20.0～25.0％。
  8. 如权利要求1所述聚丙烯组合物，其特征在于，所述滑石粉的粒径为5000-10000目。
  9. 如权利要求1～8中任一项所述聚丙烯组合物，其特征在于，所述聚丙烯组合物还包含抗氧剂0～0.6份。
  10. 如权利要求9所述聚丙烯组合物，其特征在于，所述抗氧剂为1010、AO-330、4213A、3114、168、PEP-36和627AV中的至少一种。
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