WO2021004293A1 - 一种聚丙烯复合材料及其制备方法和一种应用 - Google Patents

一种聚丙烯复合材料及其制备方法和一种应用 Download PDF

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WO2021004293A1
WO2021004293A1 PCT/CN2020/098136 CN2020098136W WO2021004293A1 WO 2021004293 A1 WO2021004293 A1 WO 2021004293A1 CN 2020098136 W CN2020098136 W CN 2020098136W WO 2021004293 A1 WO2021004293 A1 WO 2021004293A1
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composite material
ethylene
ethylene propylene
polypropylene
propylene copolymer
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PCT/CN2020/098136
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French (fr)
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雷亮
叶南飚
黄险波
俞飞
吴亦建
苏娟霞
彭莉
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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    • 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
    • C08L23/12—Polypropene
    • 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • 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
    • 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
    • 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
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • 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
    • C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • 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
    • C08L25/08—Copolymers of styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • 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
    • C08L2205/06—Polymer mixtures characterised by other features having improved processability or containing aids for moulding methods

Definitions

  • the invention relates to the technical field of polymer materials, in particular to a polypropylene composite material, a preparation method and an application thereof.
  • Polypropylene has the advantages of low density, easy processing, and excellent mechanical properties, and has been widely used in the automotive industry, home appliances and machinery.
  • polypropylene is mainly used in automotive interior and exterior parts, interior parts such as instrument panels, door panels and pillars, and exterior parts such as bumpers, fenders, and deflectors.
  • automotive materials With people's attention and attention to the appearance of automotive materials, automotive materials not only have excellent mechanical properties, but also need to have excellent appearance performance, and no pitting, crystal spots, fish eyes, sink marks and pinholes and other appearance defects.
  • a needle eye is a part that has a concave on both sides and a raised point on the surface of the part after the material is injection molded, similar to a human eye, so it is commonly called a needle eye.
  • the needle eye is large (>200um), it is visible to the naked eye, and spray paint can not only cover the needle eye, but also make the needle eye more obvious, which seriously affects the appearance of the part.
  • Chinese patent 201711066943.4 which first passes the plasticized polypropylene melt through a filter set consisting of four 100/200/400/100 mesh filters for coarse filtration, and then passes through 50 filters with a precision of (pore size 40 microns) ) The disc-type precision filter composed of filter discs for fine filtration, thereby reducing crystal points.
  • Chinese patent 201711066991.3 adds antioxidants and lubricants to polypropylene materials to prevent polypropylene from being oxidized and cross-linked to produce crystal points under high temperature and pressure.
  • Chinese patent 201610001893.0 uses silicone masterbatch and fatty acid amide lubricants to improve the fluidity of polypropylene materials, thereby improving the effect of injection molding pressure maintaining and shrinking, and improving the sink marks of polypropylene materials.
  • the purpose of the present invention is to provide a polypropylene composite material, which has the advantage of good appearance.
  • Another object of the present invention is to provide a method for preparing the above-mentioned polypropylene composite material.
  • the present invention is achieved through the following technical solutions.
  • a polypropylene composite material in parts by weight, comprising the following components:
  • Toughening agent 0-30 copies
  • the ethylene content is 6-15%
  • the crystallinity is 10-20%
  • the molecular weight is 30,000-120,000 g/mol.
  • the polypropylene resin is selected from at least one of homopolypropylene or copolymer polypropylene; when the polypropylene resin is homopolypropylene, the content of the toughening agent is not zero.
  • Copolymerized polypropylene contains a certain amount of rubber particles. Even if no toughening agent is added, the appearance of the polypropylene composite material prepared from it will have a certain degree of pinhole phenomenon. When the toughening agent is added, the rubber of the toughening agent The particles are not easy to disperse, causing the aggravation of pinholes.
  • the present invention utilizes the good compatibility of the ethylene-propylene copolymer and rubber to significantly disentangle the rubber molecular chain, thereby making the rubber easier to disperse, and the pinholes are reduced. It becomes less.
  • the ethylene content ranges from 4 to 16%
  • the crystallinity ranges from 4 to 35%
  • the molecular weight ranges from 20,000 to 150,000 g/mol. Even if the ethylene content of the ethylene propylene copolymer is 6-15% and the molecular weight is 30,000-120,000 g/mol, the crystallinity range is not necessarily within the range of 10-20%, which is determined by the preparation process of the ethylene propylene copolymer .
  • ethylene propylene copolymers are used for films, sheets and hot melt adhesives.
  • the amount of ethylene propylene copolymer is 5-9 parts.
  • the addition amount of ethylene-propylene copolymer is low, the effect of improving pinholes is poor.
  • the addition amount of ethylene-propylene copolymer is high, the ethylene-propylene copolymer itself becomes more entangled and the detangling effect on rubber becomes poor, resulting in pinholes. The improvement effect becomes worse.
  • the appearance of a sample is measured by the number and size of needle holes.
  • the number of needle holes is large (more than 10/100*100mm sample)
  • the needle holes are smaller than 150 microns, it will have a great negative effect on the appearance.
  • the number of pinholes is small (for example, only 5/100*100mm sample)
  • the pinhole is larger than 200 microns or even larger than 300 microns, the pinhole will appear very abrupt.
  • the ethylene propylene copolymer is at least one of ethylene propylene random copolymer and ethylene propylene block copolymer; preferably, the ethylene propylene copolymer is selected from ethylene propylene block copolymers.
  • the ethylene content in the ethylene propylene copolymer is 11-13%, the crystallinity is 14-16%, and the molecular weight is 80000-100000 g/mol.
  • the toughening agent is selected from at least one of ethylene-butene copolymer elastomer, ethylene-octene copolymer elastomer, and styrene copolymer elastomer.
  • Ethylene-butene copolymer elastomer it can be a copolymer of ethylene and butene, with a melt flow rate of 0.5-30g/10min;
  • Ethylene-octene copolymer elastomer it can be a copolymer of ethylene and octene, and the melt flow rate is 0.5-30g/10min;
  • Styrenic copolymer elastomer It can be styrene-butadiene-styrene copolymer (SBS) or hydrogenated SBS (SEBS), and the melt flow rate is 0.5-30g/10min;
  • SBS styrene-butadiene-styrene copolymer
  • SEBS hydrogenated SBS
  • the polypropylene composite material can also include: by weight, 0.2-2 parts of auxiliary agent; the auxiliary agent is selected from at least one of antioxidants and light stabilizers .
  • the antioxidant can be hindered phenol and phosphite antioxidants, specifically one of 1010, 1076, 3114, 168, and PEP-36 or a mixture of two or more of them.
  • the light stabilizer can be a hindered amine light stabilizer, specifically one or a mixture of two or more of UV-3808PP5, LA-402XP, and LA-402AF.
  • the preparation method of the above-mentioned polypropylene composite material includes the following steps: the polypropylene resin, the toughening agent, the ethylene propylene copolymer, and the auxiliary agent are uniformly mixed and then added to the twin-screw extruder for melting and mixing, and the melting and mixing temperature
  • the temperature is 170-220°C
  • the screw speed is 350-450 rpm
  • the polypropylene composite material is obtained by extrusion granulation.
  • ethylene propylene copolymer in improving the needle hole of polypropylene composite material, by weight, includes the following components:
  • Toughening agent 0-30 copies
  • the ethylene content is 6-15%
  • the crystallinity is 10-20%
  • the molecular weight is 30,000-120,000 g/mol.
  • the present invention can disentangle rubber molecular chains, improve the dispersibility of rubber particles, improve the technical problems of needle holes on the surface of the polypropylene composite material, and improve the condition of needle holes After that, the appearance of the part can be improved.
  • Figure 1 A photo with a small needle eye
  • Figure 2 A photo of a larger needle eye.
  • the raw materials used in the present invention are all derived from commercially available products.
  • Homopolymer polypropylene PP H9018;
  • Copolymer polypropylene PP EP548R;
  • Ethylene propylene copolymer A molecular weight 85,000, crystallinity 15%, ethylene content 12%, ethylene propylene block copolymer;
  • Ethylene propylene copolymer B molecular weight 88,000, crystallinity 14%, ethylene content 13%, ethylene propylene random copolymer;
  • Ethylene propylene copolymer C molecular weight 60,000, crystallinity 18%, ethylene content 9.5%, ethylene propylene random copolymer;
  • Ethylene propylene copolymer D molecular weight 118,000, crystallinity 16%, ethylene content 7%, ethylene propylene random copolymer;
  • Ethylene propylene copolymer E molecular weight 78000, crystallinity 8%, ethylene content 13%, ethylene propylene random copolymer;
  • Ethylene propylene copolymer F molecular weight 90000, crystallinity 7.6%, ethylene content 5%, ethylene propylene random copolymer;
  • Toughening agent ethylene-butene copolymer elastomer, the melt flow rate is 5.0g/10min;
  • the preparation method of the polypropylene composite material of the embodiment and the comparative example is that the polypropylene resin, the toughening agent, the ethylene propylene copolymer, and the auxiliary agent are mixed uniformly according to the ratio and then added to the twin-screw extruder for melt mixing and melt mixing.
  • the refining temperature is 170-220 DEG C
  • the screw speed is 350-450 rpm
  • extrusion granulation is performed, and the polypropylene composite material is obtained.
  • Needle eye size Observe the shape of the needle eye with a microscope, measure and count the size of the needle eye.
  • Table 1 The distribution ratio (parts by weight) of each component of the polypropylene composite material of the embodiment and the performance test results
  • Table 2 The distribution ratio (weight parts) and performance test results of each group of polypropylene composite material of the comparative example
  • Example 5 it can be seen from Examples 1-5 that within the preferred range of the amount of ethylene-propylene copolymer, the needle holes of the polypropylene composite material are in better condition.
  • Example 5 the number of needle holes reached 5, but the size of the needle holes was controlled at Below 200 microns, the pinhole condition is judged to be good.
  • Example 3/7/8/9 It can be seen from Example 3/7/8/9 that the preferred ethylene-propylene copolymer has a better effect on improving the needle hole.

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  • Health & Medical Sciences (AREA)
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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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Abstract

本发明公开了一种聚丙烯复合材料，按重量份计，包括以下组分：聚丙烯树脂63-99份；增韧剂0-30份；乙烯丙烯共聚物3-10份；其中，乙烯丙烯共聚物中，乙烯含量为6-15％，结晶度为10-20％，分子量为30000-120000g/mol。聚丙烯树脂可以是均聚聚丙烯或者共聚聚丙烯，当聚丙烯树脂为均聚聚丙烯时，增韧剂的含量不为0。本发明通过加入一定量的乙烯丙烯共聚物，能够缠结聚丙烯复合材料中的橡胶颗粒，从而改善聚丙烯复合材料的针眼现象。

Description

一种聚丙烯复合材料及其制备方法和一种应用 技术领域
本发明涉及高分子材料技术领域，特别是涉及一种聚丙烯复合材料及其制备方法和一种应用。
背景技术
聚丙烯(PP)具有密度低、易加工、力学性能优异等优点，已广泛应用在汽车工业、家电及机械领域。对于汽车工业，聚丙烯主要应用在汽车内外饰零部件上，内饰件如仪表板、门板和立柱等，外饰件如保险杠、挡泥板、导流板等。随着人们对汽车材料外观的关注和重视，汽车材料不仅具有优异的力学性能，还需具有优良的外观表现，且没有麻点、晶点、鱼眼、缩痕和针眼等外观缺陷。
针眼是材料注塑成制件后，制件表面有一种两边凹陷中间凸起的点，类似人的眼睛，因此俗称为针眼。针眼较大(＞200um)时，肉眼可见，且喷漆不仅不能掩盖针眼，还会使针眼更加明显，严重影响制件外观。
为了改善聚丙烯材料的外观，人们进行了很多研究。中国专利201711066943.4，其将塑化好的聚丙烯熔体先通过100/200/400/100目的四片过滤网组成的过滤网组进行粗滤，然后再经过由50片过滤精度为(孔径40微米)的过滤碟片组成的碟片式精密过滤器进行精滤，从而减少晶点。中国专利201711066991.3在聚丙烯材料中添加抗氧剂和润滑剂防止聚丙烯高温高压下氧化、交联产生晶点。中国专利201610001893.0采用硅酮母粒和脂肪酸酰胺类润滑剂提高聚丙烯材料的流动性，进而提高注塑保压补缩效果，改善聚丙烯材料制件的缩痕。
然而，目前对于针眼改善技术研究鲜有报道。
发明内容
本发明的目的在于，提供一种聚丙烯复合材料，其具有外观良好的优点。
本发明的另一目的在于，提供上述聚丙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。
一种聚丙烯复合材料，按重量份计，包括以下组分：
聚丙烯树脂           63-99份；
增韧剂               0-30份；
乙烯丙烯共聚物       3-10份；
其中，乙烯丙烯共聚物中，乙烯含量为6-15％，结晶度为10-20％，分子量为30000-120000g/mol。
聚丙烯树脂选自均聚聚丙烯或者共聚聚丙烯中的至少一种；当聚丙烯树脂为均聚聚丙烯时，增韧剂的含量不为0。
共聚聚丙烯中，含有一定含量的橡胶颗粒，即使不加入增韧剂，由其制备的聚丙烯复合材料的外观也会有一定程度的针眼现象，当加入增韧剂后，增韧剂的橡胶颗粒不易分散，造成针眼的加重。
本发明通过在聚丙烯复合材料中加入上述乙烯丙烯共聚物，利用乙烯丙烯共聚物与橡胶相容性好的特点，显著使橡胶分子链解缠结，从而使橡胶更容易分散，针眼既变小又变少。
一般的，已知的乙烯丙烯共聚物中，乙烯含量范围4-16％，结晶度范围4-35％，分子量范围20000-150000g/mol。即使乙烯丙烯共聚物的乙烯含量范围是6-15％、分子量为30000-120000g/mol，其结晶度范围也不必然在10-20％范围内，这是根据乙烯丙烯共聚物的制备过程决定的。一般的，乙烯丙烯共聚物用于薄膜、片材和热熔胶。
优选的，乙烯丙烯共聚物的用量为5-9份。当乙烯丙烯共聚物添加量较低时，改善针眼效果较差，当乙烯丙烯共聚物添加量较高时，乙烯丙烯共聚物自身缠结变多，对橡胶的解缠结效果变差，导致针眼改善效果变差。
一块样板的外观好坏是通过针眼数目、针眼大小来衡量的。当针眼数目多时(多于10个/100*100mm样板)，即使针眼小于150微米，也会给外观造成很大的负面影响。同时，即使针眼数目很少(比如仅有5个/100*100mm样板)，当针眼大于200微米甚至大于300微米时，针眼也会显得非常突兀。
所述的乙烯丙烯共聚物为乙烯丙烯无规共聚物、乙烯丙烯嵌段共聚物中的至少一种；优选的，所述的乙烯丙烯共聚物选自乙烯丙烯嵌段共聚物。
优选的，所述的乙烯丙烯共聚物中乙烯含量为11-13％，结晶度为14-16％，分子量为80000-100000g/mol。
所述的增韧剂选自乙烯-丁烯共聚物弹性体、乙烯-辛烯共聚物弹性体、苯乙烯类共聚物弹性体中的至少一种。
乙烯-丁烯共聚物弹性体：可以是乙烯和丁烯的共聚物，熔体流动速率为0.5-30g/10min；
乙烯-辛烯共聚物弹性体：可以是乙烯和辛烯的共聚物，熔体流动速率为0.5-30g/10min；
苯乙烯类共聚物弹性体：可以是苯乙烯-丁二烯-苯乙烯共聚物(SBS)或氢化的SBS(SEBS)，熔体流动速率为0.5-30g/10min；
根据聚丙烯复合材料的加工性能以及光稳定性能，还可以包括：按重量份计， 还包括0.2-2份助剂；所述的助剂选自抗氧剂、光稳定剂中的至少一种。
抗氧剂可以是受阻酚类和亚磷酸酯类抗氧剂，具体可以是1010、1076、3114、168、PEP-36中的一种或者两种及以上的混合物。
光稳定剂可以是受阻胺类光稳定剂，具体可以是UV-3808PP5、LA-402XP、LA-402AF中的一种或者两种及以上的混合物。
上述的聚丙烯复合材料的制备方法，包括以下步骤：将聚丙烯树脂、增韧剂、乙烯丙烯共聚物、助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170～220℃，螺杆转速为350～450转/分，挤出造粒，得到聚丙烯复合材料。
乙烯丙烯共聚物在改善聚丙烯复合材料针眼的应用，按重量份计，包括以下组分：
聚丙烯树脂           63-99份；
增韧剂               0-30份；
乙烯丙烯共聚物       3-10份；
其中，乙烯丙烯共聚物中，乙烯含量为6-15％，结晶度为10-20％，分子量为30000-120000g/mol。
本发明具有如下有益效果
本发明通过在聚丙烯复合材料中添加一定量的特定乙烯丙烯共聚物，能够使橡胶分子链解缠结，提升橡胶颗粒的分散性，改善聚丙烯复合材料表面针眼的技术问题，改善了针眼状况后能够提升制件的外观。
附图说明
图1：针眼较小的照片；
图2：针眼较大的照片。
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。
均聚聚丙烯：PP H9018；
共聚聚丙烯：PP EP548R；
乙烯丙烯共聚物A：分子量85000、结晶度15％、乙烯含量12％、乙烯丙烯嵌段共聚物；
乙烯丙烯共聚物B：分子量88000、结晶度14％、乙烯含量13％、乙烯丙烯无规共聚物；
乙烯丙烯共聚物C：分子量60000、结晶度18％、乙烯含量9.5％、乙烯丙烯无规共聚物；
乙烯丙烯共聚物D：分子量118000、结晶度16％、乙烯含量7％、乙烯丙烯无规共聚物；
乙烯丙烯共聚物E：分子量78000、结晶度8％、乙烯含量13％、乙烯丙烯无规共聚物；
乙烯丙烯共聚物F：分子量90000、结晶度7.6％、乙烯含量5％、乙烯丙烯无规共聚物；
增韧剂：乙烯-丁烯共聚物弹性体，熔体流动速率为5.0g/10min；
抗氧剂：抗氧剂1010/抗氧剂168＝1:1；
光稳定剂：UV-3808PP5。
实施例和对比例聚丙烯复合材料的制备方法，按照配比将聚丙烯树脂、增韧剂、乙烯丙烯共聚物、助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170～220℃，螺杆转速为350～450转/分，挤出造粒，得到聚丙烯复合材料。
各项性能测试方法
(1)针眼数目：将聚丙烯组合物注塑成100*100mm样板，观察样板表面针眼形貌，并统计样板表面的针眼数目。
(2)针眼大小：采用显微镜观察针眼形貌，测量并统计针眼大小。
表1：实施例聚丙烯复合材料各组分配比(重量份)及各项性能测试结果
Figure PCTCN2020098136-appb-000001
Figure PCTCN2020098136-appb-000002
续表1：
Figure PCTCN2020098136-appb-000003
表2：对比例聚丙烯复合材料各组分配比(重量份)及各项性能测试结果
Figure PCTCN2020098136-appb-000004
从实施例1-5可以看出，在优选的乙烯-丙烯共聚物用量的范围内，聚丙烯复合材料的针眼情况较好，实施例5及时针眼的数目达到5个，但是由于针眼大小控制在200微米以下，针眼状况判断为良。
从实施例3/7/8/9可以看出，优选的乙烯-丙烯共聚物，其对于针眼的改善效果更好。
从实施例和对比例1-2可以看出，对比例使用的乙烯丙烯共聚物，其各单体含量等参数不在本发明限制的范围内时，对于针眼效果的改善较差，应用价值不高。
从对比例4/5可以看出，乙烯丙烯共聚的用量范围需要限制在3-10的范围内，加入量太少时，针眼数目较多，且针眼较大。当乙烯丙烯共聚物的加入量过高时，针眼状况也会加重。

Claims (9)

  1. 一种聚丙烯复合材料，其特征在于，按重量份计，包括以下组分：
    聚丙烯树脂           63-99份；
    增韧剂               0-30份；
    乙烯丙烯共聚物       3-10份；
    其中，乙烯丙烯共聚物中，乙烯含量为6-15％，结晶度为10-20％，分子量为30000-120000g/mol。
  2. 根据权利要求1所述的聚丙烯复合材料，其特征在于，聚丙烯树脂选自均聚聚丙烯或者共聚聚丙烯中的至少一种；当聚丙烯树脂为均聚聚丙烯时，增韧剂的含量不为0。
  3. 根据权利要求1所述的聚丙烯复合材料，其特征在于，乙烯丙烯共聚物的用量为5-9份。
  4. 根据权利要求1所述的聚丙烯复合材料，其特征在于，所述的乙烯丙烯共聚物为乙烯丙烯无规共聚物、乙烯丙烯嵌段共聚物中的至少一种；优选的，所述的乙烯丙烯共聚物选自乙烯丙烯嵌段共聚物。
  5. 根据权利要求1所述的聚丙烯复合材料，其特征在于，所述的乙烯丙烯共聚物中乙烯含量为11-13％，结晶度为14-16％，分子量为80000-100000 g/mol。
  6. 根据权利要求1所述的聚丙烯复合材料，其特征在于，所述的增韧剂选自乙烯-丁烯共聚物弹性体、乙烯-辛烯共聚物弹性体、苯乙烯类共聚物弹性体中的至少一种。
  7. 根据权利要求1所述的聚丙烯复合材料，其特征在于，按重量份计，还包括0.2-2份助剂；所述的助剂选自抗氧剂、光稳定剂中的至少一种。
  8. 权利要求7所述的聚丙烯复合材料的制备方法，其特征在于，包括以下步骤：将聚丙烯树脂、增韧剂、乙烯丙烯共聚物、助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170～220℃，螺杆转速为350～450转/分，挤出造粒，得到聚丙烯复合材料。
  9. 乙烯丙烯共聚物在改善聚丙烯复合材料针眼的应用，其特征在于，按重量份计，包括以下组分：
    聚丙烯树脂           63-99份；
    增韧剂               0-30份；
    乙烯丙烯共聚物       3-10份；
    其中，乙烯丙烯共聚物中，乙烯含量为6-15％，结晶度为10-20％，分子量为30000-120000g/mol。
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