WO2024066969A1 - 一种聚丙烯组合物及其制备方法和应用 - Google Patents

一种聚丙烯组合物及其制备方法和应用 Download PDF

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WO2024066969A1
WO2024066969A1 PCT/CN2023/117128 CN2023117128W WO2024066969A1 WO 2024066969 A1 WO2024066969 A1 WO 2024066969A1 CN 2023117128 W CN2023117128 W CN 2023117128W WO 2024066969 A1 WO2024066969 A1 WO 2024066969A1
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parts
polypropylene resin
polypropylene
antioxidant
nucleating agent
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French (fr)
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胡佳旭
陈平绪
叶南飚
吴亦建
秦炜
俞飞
陈嘉杰
雷亮
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Kingfa Science and Technology Co Ltd
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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
    • 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
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials
    • 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
    • C08L2205/24—Crystallisation aids

Definitions

  • the invention belongs to the field of polymers, and in particular relates to a polypropylene composition and a preparation method and application thereof.
  • Polypropylene has the advantages of low density, easy processing, and excellent mechanical properties. It has been widely used in the automotive industry, home appliances, and medical fields. However, when ordinary polypropylene is used in medical equipment and instruments, in addition to transparency requirements, it is also required to be transparent during daily disinfection and use of the equipment. Ordinary transparent polypropylene is still acceptable in terms of visible light transmission, but it is difficult to transmit ultraviolet rays. Generally, the ultraviolet transmittance is only less than 10%. In addition, ordinary polypropylene is sensitive to ultraviolet rays and is prone to aging. After 2 hours of ultraviolet disinfection, it will show obvious yellowing, and even become brittle due to aging. Therefore, the application of polypropylene is limited in the ultraviolet application environment.
  • the present invention aims to provide a polypropylene composition and a preparation method and application thereof.
  • the polypropylene composition of the present invention has not only high visible light transmittance, but also good ultraviolet light transmittance and is resistant to ultraviolet aging.
  • a polypropylene composition comprising the following components in parts by weight: 40 to 95 parts of random copolymer polypropylene resin, 5 to 55 parts of homopolymer polypropylene resin, 2 to 8 parts of chlorinated polypropylene resin, 0.1 to 0.5 parts of antioxidant, 0.24 to 0.4 parts of light stabilizer, 0.1 to 0.5 parts of nucleating agent, and 0.1 to 0.5 parts of lubricant; the chlorine content of the chlorinated polypropylene resin is 20% to 26wt%; the isotacticity of the homopolymer polypropylene resin mmmm>97%.
  • the chlorine content of the chlorinated polypropylene resin is determined by oxygen bottle combustion-potentiometric titration; the isotacticity of the homopolymer polypropylene resin is determined in accordance with GB 2412-2008.
  • the isotacticity of homopolymer polypropylene represents the regularity of arrangement of propylene molecules in the macromolecular chain. The higher the regularity, the faster the homopolymer polypropylene crystallizes, which is conducive to making the spherulites smaller.
  • the polypropylene composition comprises the following components in parts by weight: 50-75 parts of random copolymer polypropylene resin, 20-44 parts of homopolymer polypropylene resin, 4-6 parts of chlorinated polypropylene resin, 0.2-0.4 parts of antioxidant, 0.25-0.3 parts of light stabilizer, 0.2-0.3 parts of nucleating agent, and 0.2-0.3 parts of lubricant.
  • the polypropylene composition comprises at least one of the following (1) to (3):
  • the random copolymer polypropylene resin has a melt mass flow rate of 0.2 to 13 g/10 min at 230° C. and a load of 2.16 kg;
  • the comonomer content of the random copolymer polypropylene is 3% to 7%; the random comonomer is inserted into the long molecular chain of polypropylene, destroying the regularity of the molecular chain, reducing the overall crystallinity and generating a relatively small spherulite size;
  • the homopolymer polypropylene resin has a melt mass flow rate of 45 to 150 g/10 min at 230° C. and a load of 2.16 kg;
  • the melt mass flow rate of the above-mentioned random copolymer polypropylene resin and homopolymer polypropylene resin are measured in accordance with ISO 1133-1 2011.
  • the nucleating agent is a fourth generation sorbitol transparent nucleating agent.
  • the addition of the nucleating agent can limit the crystallization of the polypropylene composite and reduce the size. When the crystal size is lower than the wavelength of ultraviolet light, it is conducive to the passage of ultraviolet light, thereby improving the ultraviolet light transmittance. When the nucleating agent is not added, the ultraviolet light transmittance of the material will be reduced. At the same time, the weight ratio of the nucleating agent also has a great influence on the final performance of the polypropylene composition. When the amount of the nucleating agent is small, the spherulites of the polypropylene are still large and the requirement of high ultraviolet light transmittance cannot be met.
  • the polypropylene composition comprises at least one of the following (1) to (3):
  • the antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant. More preferably, the antioxidant is a compound of a hindered phenol antioxidant and a phosphite antioxidant.
  • the light stabilizer is a UV absorber and a hindered amine light stabilizer
  • the lubricant is at least one of glyceryl monostearate and stearic acid metal salt compounds.
  • a method for preparing the polypropylene composition comprises the following steps:
  • the portion of random copolymerized polypropylene resin in step S1 accounts for 20% to 40% of the total weight of the random copolymerized polypropylene resin.
  • the temperature of melt kneading in step S1 is 170-250° C., and the screw speed is 450-550 rpm.
  • the temperature of melt kneading in step S2 is 160-180° C., and the screw speed is 350-600 rpm.
  • a twin-screw extruder is used for melt mixing and extrusion granulation.
  • the invention discloses an application of the polypropylene composition in the fields of medical containers (test tube boxes, tool boxes, medicine boxes, etc.) and consumables (disposable reaction containers in the process of ultraviolet curing reaction).
  • the random copolymer polypropylene used in the present invention as the resin matrix has good mechanical properties and crystallinity, so that it can achieve light transmission.
  • homopolymer polypropylene resin is added to the random copolymer polypropylene, polypropylene crystallization and the generation of larger spherulites can be inhibited, further improving the light transmittance.
  • the present invention adds a nucleating agent to the resin matrix component to further inhibit the formation of crystals of the polypropylene component and make the crystal size
  • a nucleating agent to the resin matrix component to further inhibit the formation of crystals of the polypropylene component and make the crystal size
  • the crystal size is smaller than the wavelength of ultraviolet light, it is conducive to the passage of ultraviolet light.
  • the interface between spherulites and spherulites, and between spherulites and amorphous regions inside polypropylene is too obvious, and the refraction and reflection losses are too much, resulting in a decrease in the ultraviolet light transmission rate. Therefore, the inventors also added a chlorinated polypropylene resin component to modify the random copolymer polypropylene, nucleating agent, antioxidant, light stabilizer and other component systems.
  • the polarity of the chlorine functional group in the chlorinated polypropylene resin is very large, and only a small part can participate in crystallization.
  • the uncrystallized part remains outside the spherulites and retains a certain length. Due to the presence of polar chlorine functional groups, there is a certain force between spherulites, and the remaining chlorinated polypropylene chain segments on the surface of the spherulites weaken the interface between spherulites and between spherulites and amorphous regions, reducing the refraction and reflection losses, thereby effectively improving the ultraviolet light transmittance of the obtained polypropylene composition.
  • the present invention has the following beneficial effects:
  • the present invention adds a nucleating agent and a chlorinated polypropylene resin to a random copolymer polypropylene resin and a homopolymer polypropylene resin, and then compounding with an antioxidant, a light stabilizer, and a lubricant to obtain a polypropylene composition having a high visible light transmittance and ultraviolet light transmittance.
  • the high light transmittance characteristic can improve the transmittance of light, reduce the absorption of light energy by the polypropylene material, reduce the transition from the molecular ground state to the excited state, thereby reducing the probability of molecular chain scission, extending the anti-aging performance of the product, and effectively extending the service life of the obtained product. Therefore, the polypropylene composition of the present application can be better applied to the field of medical containers and consumables.
  • FIG. 1 is a diagram showing the reaction mechanism of the reflection of light after the weakened interface of the present invention (a) and the reflection of light by ordinary spherulites (b).
  • FIG. 2 is a photograph of crystallization after (a) weakening the interface of the present invention and before (b) weakening the interface.
  • FIG. 3 is a photograph of the size of spherulites after (a) and before (b) light-transmitting modification of the present invention.
  • antioxidants, light stabilizers, and lubricants are all commercially available, and the same antioxidants, light stabilizers, and lubricants are used in parallel experiments.
  • the preparation method of the polypropylene composition of Examples 1-9 and Comparative Examples 1-8 comprises the following steps:
  • the polypropylene composition prepared in the embodiment of the present invention can not only maintain a relatively high visible light transmittance range of 80-87.5%, but also has a good ultraviolet light transmittance, the ultraviolet light transmittance can be maintained at 41.9%-48.1%, and the highest ultraviolet light transmittance can reach 48.1%, achieving excellent ultraviolet aging resistance.
  • Comparative Examples 1 to 2 chlorinated polypropylene is not added or chlorinated polyethylene is used to replace it, resulting in a significant decrease in the visible light transmittance and ultraviolet light transmittance of the obtained polypropylene composition, and the ultraviolet aging resistance of Comparative Example 2 is much worse than that of the embodiment of the present invention; the chlorine content of the chlorinated polypropylene resin added in Comparative Examples 3 to 4 is too high or too low, resulting in a low ultraviolet light transmittance of the obtained wiping material; the weight portion of the nucleating agent added in Comparative Example 5 is not appropriate, resulting in a low visible light transmittance and ultraviolet light transmittance of the polypropylene composition, which are both worse than those of the embodiment, and the ultraviolet aging resistance is also poor.
  • the isotacticity of the homopolymerized polypropylene resin selected in Comparative Example 6 is less than 97%, and the visible light transmittance, ultraviolet light transmittance and anti-ultraviolet aging performance of the obtained polypropylene composition are all worse than those of the embodiment; the weight proportions of the chlorinated polypropylene resin added in Comparative Examples 7 and 8 are not appropriate, resulting in the visible light transmittance and ultraviolet light transmittance of the obtained polypropylene composition being worse than those of the embodiment, and the polypropylene composition product obtained in Comparative Example 8 itself is seriously yellowed.
  • the embodiments of the present invention select random copolymer polypropylene or random copolymer polypropylene and homopolymer polypropylene as the base resin component, add components such as a nucleating agent and an antioxidant, and select chlorinated polypropylene resin to modify the component system.
  • the prepared polypropylene composition can have a high visible light transmittance and ultraviolet light transmittance, and achieve excellent ultraviolet aging resistance.

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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)

Abstract

本发明属于聚合物领域，具体涉及一种聚丙烯组合物及其制备方法和应用。所述聚丙烯组合物包括以下重量份计的组分：无规共聚聚丙烯树脂40～95份、均聚聚丙烯树脂5～55份、氯化聚丙烯树脂2～8份、抗氧剂0.1～0.5份、光稳定剂0.24～0.4份、成核剂0.1～0.5份、润滑剂0.1～0.5份；所述氯化聚丙烯树脂的氯含量为20％～26wt％；所述均聚聚丙烯树脂的等规度mmmm>97％。本发明在无规共聚聚丙烯树脂和均聚聚丙烯树脂组分中通过加入氯化聚丙烯树脂、成核剂等进行改性，得到的聚丙烯组合物具有较高的可见光透光率和紫外光透光率，同时具有优异的耐紫外老化性能，可以有效延长制得产品的使用寿命。

Description

一种聚丙烯组合物及其制备方法和应用 技术领域
本发明属于聚合物领域，具体涉及一种聚丙烯组合物及其制备方法和应用。
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、家电及医疗领域。但是普通的聚丙烯在应用医疗设备和器械时，除了有透明要求外，在设备日常消毒和使用过程中还要求透紫外线，而普通的透明聚丙烯在透过可见光方面还尚可，紫外线则很难透过，一般紫外透过率只有10％以下；另外，普通聚丙烯对紫外线敏感，容易发生老化，紫外线消毒2小时后就出现明显黄变，甚至老化变脆。因此，在紫外线应用环境中，聚丙烯的应用受到了限制。
发明内容
本发明旨在提供一种聚丙烯组合物及其制备方法和应用。本发明聚丙烯组合物不仅具有较高的可见光透过率，还具有良好的紫外光透光率，同时耐紫外老化。
为了达到上述目的，本发明采用以下技术方案：一种聚丙烯组合物，包括以下重量份计的组分：无规共聚聚丙烯树脂40～95份、均聚聚丙烯树脂5～55份、氯化聚丙烯树脂2～8份、抗氧剂0.1～0.5份、光稳定剂0.24～0.4份、成核剂0.1～0.5份、润滑剂0.1～0.5份；所述氯化聚丙烯树脂的氯含量为20％～26wt％；所述均聚聚丙烯树脂的等规度mmmm>97％。
所述氯化聚丙烯树脂的氯含量通过氧瓶燃烧-电位滴定法进行测定；所述均聚聚丙烯树脂的等规度按照GB 2412-2008进行测定。
均聚聚丙烯的等规度代表大分子链中丙烯分子的排列规整性，规整性越高，均聚聚丙烯结晶越快，有利于使球晶变小。
优选地，所述的聚丙烯组合物，包括以下重量份计的组分：无规共聚聚丙烯树脂50～75份、均聚聚丙烯树脂20～44份、氯化聚丙烯树脂4～6份、抗氧剂0.2～0.4份、光稳定剂0.25～0.3份、成核剂0.2～0.3份、润滑剂0.2～0.3份。
优选地，所述的聚丙烯组合物，至少包含以下(1)～(3)中的一项：
(1)所述无规共聚聚丙烯树脂在230℃，2.16kg负荷下，熔体质量流动速率为0.2～13g/10min；
(2)所述无规共聚聚丙烯的共聚单体含量为3％～7％；无规共聚单体插入到聚丙烯长分子链中，破坏了分子链的规整度，使整体结晶度降低、生成的球晶尺寸相对较小；
(3)所述均聚聚丙烯树脂在230℃，2.16kg负荷下，熔体质量流动速率为45～150g/10min；
上述无规共聚聚丙烯树脂和均聚聚丙烯树脂的熔体质量流动速率均按照ISO 1133-1 2011进行测定。
优选地，所述成核剂为第四代山梨醇类透明成核剂。成核剂的加入能够使聚丙烯复合物的结晶受到限制并使尺寸减小，当结晶尺寸低于紫外光波长时，有利于紫外光通过，从而提高紫外光透过率，当不添加成核剂时，材料的紫外光透光率会有所降低。同时，成核剂的重量比对聚丙烯组合物的最终性能也具有较大影响，当成核剂用量较少时，聚丙烯的球晶仍较大，无法达到较高紫外光透过率的要求。
优选地，所述的聚丙烯组合物，至少包含以下(1)～(3)中的一项：
(1)所述抗氧剂为受阻酚类抗氧剂和亚磷酸酯类抗氧剂中的至少一种，更优选地，所述抗氧剂为受阻酚类抗氧剂和亚磷酸酯类抗氧剂的复配物；
(2)所述光稳定剂为紫外线吸收剂和受阻胺类光稳定剂；
(3)所述润滑剂为单硬脂酸甘油酯和硬脂酸金属盐类化合物中的至少一种。
一种所述聚丙烯组合物的制备方法，包括以下步骤：
S1、将部分无规共聚聚丙烯树脂、抗氧剂、光稳定剂、成核剂均匀混合，之后进行熔融混炼、挤出造粒、得到混合物A；
S2、将混合物A与剩余的无规共聚聚丙烯树脂、均聚聚丙烯树脂、氯化聚丙烯树脂、润滑剂混合，之后进行熔融混炼、挤出造粒、即得聚丙烯组合物。
优选地，所述步骤S1中部分无规共聚聚丙烯树脂为无规共聚聚丙烯树脂总重量份数的20％～40％。
优选地，所述步骤S1中熔融混炼的温度为170～250℃，螺杆转速为450～550rpm。
优选地，所述步骤S2中熔融混炼的温度为160～180℃，螺杆转速为350～600rpm。
优选地，所述步骤S1和S2中均采用双螺杆挤出机进行熔融混炼、挤出造粒。
一种所述聚丙烯组合物在医疗容器(试管盒、工具盒、药品盒等)和消耗品(紫外线固化反应过程中的一次性反应容器)领域中的应用。
本发明选用无规共聚聚丙烯作为树脂基体能够具有较好的力学性能和结晶性，使其能够实现光线的透过，在无规共聚聚丙烯中添加均聚聚丙烯树脂时，可以抑制聚丙烯结晶以及较大球晶的生成，进一步提高光线的透过率。
本发明在树脂基体组分中加入成核剂，进一步抑制聚丙烯组分结晶的形成，并使结晶尺 寸减小，当结晶尺寸低于紫外光波长时，有利于紫外光通过，但聚丙烯内部球晶与球晶、球晶与非晶区之间的界面太明显，折射和反射损失太多，导致紫外光光通过率降低。于是发明人还加入了氯化聚丙烯树脂组分，对无规共聚聚丙烯、成核剂、抗氧剂、光稳定剂等组分体系进行改性，氯化聚丙烯树脂中的氯官能团极性很大，只能小部分参与结晶，未结晶的部分留在球晶的外面并保留一定长度，由于极性氯官能团的存在，使得球晶与球晶之间存在一定作用力，再加上球晶表面剩余的氯化聚丙烯链段，使球晶与球晶之间界面、球晶与非晶区之间的界面弱化，降低折射和反射损失，从而有效提高制得聚丙烯组合物的紫外光透过率。
与现有技术相比，本发明具有以下有益效果：
本发明通过在无规共聚聚丙烯树脂、均聚聚丙烯树脂中加入成核剂和氯化聚丙烯树脂，再复配以抗氧剂、光稳定剂、润滑剂得到的聚丙烯组合物具有较高的可见光透光率和紫外光透光率，较高的透光率特性可以提高光线的透过性，降低聚丙烯材料对光能的吸收，减少分子基态到激发态度跃迁，从而降低分子链断链的几率，延长产品的抗老化性能，可以有效延长制得产品的使用寿命。因此，本申请的聚丙烯组合物能够更好的应用于医疗容器和消耗品领域中。
附图说明
图1为本发明弱化界面后对光的反射(a)以及普通球晶对光的反射(b)反应机理图。
图2为本发明弱化界面后(a)与未弱化界面时(b)结晶的照片。
图3为本发明透光改性后(a)和透光改性前(b)球晶大小照片。
具体实施方式
下面将结合本发明实施例，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
下述实施例和对比例中，所使用的实验方法如无特殊说明，均为常规方法，如无特别说明，抗氧剂、光稳定剂、润滑剂均通过市售获得，且平行实验中使用的是相同的抗氧剂、光稳定剂、润滑剂。
实施例及对比例所用原料说明见表1。
表1

实施例1-9和对比例1-8
实施例1-9和对比例1-8的聚丙烯组合物，组分、重量份如表2和表3所示。
实施例1-9和对比例1-8的聚丙烯组合物的制备方法包括以下步骤：
S1、将无规共聚聚丙烯树脂总重量份数25％的无规共聚聚丙烯树脂、抗氧剂、光稳定剂、成核剂均匀混合，之后加入双螺杆挤出机中，熔融混炼，熔融混炼的温度为200℃，螺杆转速为500rpm，挤出造粒、得到混合物A；
S2、将混合物A与剩余的无规共聚聚丙烯树脂、均聚聚丙烯树脂、氯化聚丙烯树脂、润滑剂混合，之后加入双螺杆挤出机中，进行熔融混炼，熔融混炼的温度为170℃，螺杆转速为400rpm，挤出造粒、即得聚丙烯组合物。
表2实施例中组分用量(重量份)

表3对比例中组分用量(重量份)

性能测试
对实施例1～9和对比例1～8的聚丙烯组合物制备成型2mm厚度的方板，然后进行可见光透光率、紫外光透过率、紫外线照射后黄变指数测试。实验结果如表4所示。
测试方法：
(1)透光率：使用透光率雾度仪/NDH7000II进行测试；
(2)紫外线透过率：采用LH-206型光学透过率测定仪进行测定。
(3)紫外线照射后黄变指数测试：在碳弧灯老化箱内照射后，参考ASTM D 6290标准，在实验板背面增加标准白板后，采用SC-P45分光色度仪进行测量。
表4性能测试结果

从表4中的数据可以得知，本发明实施例制得的聚丙烯组合物不仅可以保持在80～87.5％较高的可见光透光率范围内，还具有良好的紫外光透光率，紫外光透光率可保持在41.9％～48.1％，最高紫外光透光率可达48.1％，实现优异的耐紫外老化性能。
对比例1～2中不加入氯化聚丙烯或者用氯化聚乙烯对其进行替换，导致制得的聚丙烯组合物具有可见光透光率和紫外光透光率均明显下降，且对比例2的抗紫外老化性能远远差于本发明实施例；对比例3～4中加入的氯化聚丙烯树脂的含氯量过高或过低，导致制得擦材料所具有的紫外光透光率较低；对比例5中加入的成核剂重量份数不合适，导致聚丙烯组合物具有的可见光透光率和紫外光透光率较低，均差于实施例，具有的耐紫外老化性能也较差。对比例6选用的均聚聚丙烯树脂的等规度小于97％，制得的聚丙烯组合物具有的可见光透光率、紫外光透光率和抗紫外老化性能均差于实施例；对比例7和对比例8加入的氯化聚丙烯树脂的重量份数不合适，导致制得的聚丙烯组合物具有的可见光透光率和紫外光透光率均差于实施例，且对比例8制得的聚丙烯组合物产品自身发黄严重。
从以上实验结果可以得知，本发明实施例通过选用无规共聚聚丙烯或无规共聚聚丙烯和均聚聚丙烯作为基体树脂组分，同时加入成核剂、抗氧化剂等组分，并选用氯化聚丙烯树脂对组分体系进行改性，制得的聚丙烯组合物能够具有较高的可见光透光率和紫外光透光率，实现优异的耐紫外老化性能。
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。

Claims (10)

  1. 一种聚丙烯组合物，其特征在于，包括以下重量份计的组分：无规共聚聚丙烯树脂40～95份、均聚聚丙烯树脂5～55份、氯化聚丙烯树脂2～8份、抗氧剂0.1～0.5份、光稳定剂0.24～0.4份、成核剂0.1～0.5份、润滑剂0.1～0.5份；所述氯化聚丙烯树脂的氯含量为20％～26wt％；所述均聚聚丙烯树脂的等规度mmmm>97％。
  2. 如权利要求1所述的聚丙烯组合物，其特征在于，包括以下重量份计的组分：无规共聚聚丙烯树脂50～75份、均聚聚丙烯树脂20～44份、氯化聚丙烯树脂4～6份、抗氧剂0.2～0.4份、光稳定剂0.25～0.3份、成核剂0.2～0.3份、润滑剂0.2～0.3份。
  3. 如权利要求1所述的聚丙烯组合物，其特征在于，至少包含以下(1)～(3)中的一项：
    (1)所述无规共聚聚丙烯树脂在230℃，2.16kg负荷下，熔体质量流动速率为0.2～13g/10min；
    (2)所述无规共聚聚丙烯树脂的共聚单体含量为3％～7％；
    (3)所述均聚聚丙烯树脂在230℃，2.16kg负荷下，熔体质量流动速率为45～150g/10min；
  4. 如权利要求1所述的聚丙烯组合物，其特征在于，所述成核剂为山梨醇类透明成核剂。
  5. 如权利要求1所述的聚丙烯组合物，其特征在于，至少包含以下(1)～(3)中的一项：
    (1)所述抗氧剂为受阻酚类抗氧剂和亚磷酸酯类抗氧剂中的至少一种；
    (2)所述光稳定剂为紫外线吸收剂和受阻胺类光稳定剂；
    (3)所述润滑剂为单硬脂酸甘油酯和硬脂酸金属盐类化合物中的至少一种。
  6. 一种如权利要求1～5任一所述聚丙烯组合物的制备方法，其特征在于，包括以下步骤：
    S1、将部分无规共聚聚丙烯树脂、抗氧剂、光稳定剂、成核剂均匀混合，之后进行熔融混炼、挤出造粒、得到混合物A；
    S2、将混合物A与剩余的无规共聚聚丙烯树脂、均聚聚丙烯树脂、氯化聚丙烯树脂、润滑剂混合，之后进行熔融混炼、挤出造粒、即得聚丙烯组合物。
  7. 如权利要求6所述的制备方法，其特征在于，所述步骤S1中部分无规共聚聚丙烯树脂为无规共聚聚丙烯树脂总重量份数的20％～40％。
  8. 如权利要求6所述的制备方法，其特征在于，所述步骤S1中熔融混炼的温度为170～250℃，螺杆转速为450～550rpm。
  9. 如权利要求6所述的制备方法，其特征在于，所述步骤S2中熔融混炼的温度为160～180℃，螺杆转速为350～600rpm。
  10. 一种如权利要求1～5任一所述聚丙烯组合物在医疗容器和消耗品领域中的应用。
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