Toughened cold-resistant transparent modified polypropylene material and preparation

A polypropylene material and homopolypropylene technology, applied in the field of modified polymer material polypropylene, can solve the problems of low transparency, poor impact strength, large difference in refractive index, etc.

Inactive Publication Date: 2009-08-12
浙江富丽新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polypropylene has low transparency and is a translucent plastic. It has outstanding performance shortcomings. The impact strength changes significantly with temperature. The impact strength also deteriorates rapidly when the temperature decreases, and it becomes brittle at minus 15 to minus 20 degrees.
Ordinary tougheners can improve the toughness and cold resistance of polypropylene, but because of the large difference between its own refractive index and polypropylene, it exists in the form of small particles when added to polypropylene, resulting in a significant decrease in the transparency of polypropylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Weigh in proportion

[0058] Homopolypropylene: 85;

[0059] Alpha olefin / propylene copolymer: 15;

[0060] Sorbitol α nucleating agent: 0.15;

[0061] Substituted aromatic amide beta nucleating agent: 0.25;

[0062] Antioxidant 215: 0.3.

[0063] The first step, take polypropylene, toughening agent, nucleating agent, antioxidant by above-mentioned weight percentage;

[0064] The second step is to mix the above materials in a high-speed mixer at a speed of 600-900 rpm for 5-8 minutes;

[0065] The third step is to send the mixed raw materials into the twin-screw extruder through the intermediate silo. Under the high-speed shearing, mixing and conveying of the twin-screws, the materials can be fully melted and compounded. The length-to-diameter ratio of the extrusion equipment is 36:1, and it is equipped with precise temperature control and vacuum exhaust equipment. The screw speed is 400-600 rpm, and the working temperature of the twin-screw extrusion is 140-160°C in...

Embodiment 2

[0071] Weigh in proportion

[0072] Homopolypropylene: 75;

[0073] Ethylene octene copolymer: 25;

[0074] Sorbitol α nucleating agent: 0.2;

[0075] Substituted benzamide β-nucleating agent: 0.12;

[0076] Rare earth complex β-nucleating agent: 0.08;

[0077] Antioxidant 1010: 0.3.

[0078] Then the material was mixed at a high speed by a high-speed mixer, mixed and granulated by a twin-screw extruder, and the obtained granules were injection molded into products, and then their properties were tested. The results are shown in Table 2:

[0079] Table 2: The finished product test result of embodiment 2 gained

[0080] Test items unit experiment method test result Flexural modulus of elasticity 23°C MPa GB / T9341-2000 1231 Charpy notched impact strength

Embodiment 3

[0082] Weigh in proportion

[0083] Homopolypropylene: 65;

[0084] Metallocene polypropylene: 35;

[0085] Sorbitol α nucleating agent: 0.25;

[0086] Aromatic amine β-nucleating agent: 0.15;

[0087] Rare earth complex β-nucleating agent: 0.05;

[0088] Antioxidant 168: 0.3.

[0089] Then the material was mixed at a high speed by a high-speed mixer, mixed and granulated by a twin-screw extruder, and the obtained granules were injection molded into products, and then their properties were tested. The results are shown in Table 3:

[0090] Table 3: The finished product test result of embodiment 3 gained

[0091] Test items unit experiment method test result Flexural modulus of elasticity 23°C MPa GB / T9341-2000 1080 Charpy notched impact strength

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PUM

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Abstract

The invention provides a toughening cold-resistant transparent modified polypropylene material and a preparation method. The material is mainly made from the following components in parts by weight: 60-90 parts of homogeneous polypropylene, 10-30 parts of a toughening agent, 0.1-0.4 part of an alpha-nucleation agent, 0.1-0.4 part of a beta-nucleation agent and 0.2-0.4 part of an antioxidant. The material is added with propylene made from alpha-olefin with the same refractive index as polypropylene and a semi-crystalline polymer of the alpha-olefin as the toughening agent, thus the material can reduce effect on transparence of the polypropylene material and realize cold resistance and toughening of the polypropylene, and can be used together with an alpha-crystallographic form nucleating agent after compounding with a beta-crystallographic form nucleating agent to control proportions of polypropylene alpha-crystallographic form to polypropylene beta-crystallographic form, thus improving transparence of the polypropylene, compensating rigidity at room temperature and heat deformation temperature of the polypropylene and finally realizing development of the toughening cold-resistant transparent modified polypropylene.

Description

technical field [0001] The invention relates to a modified polymer material polypropylene, especially the polypropylene with cold resistance and transparency. Background technique [0002] Polypropylene is the second largest general-purpose resin in the world. It has the characteristics of light weight, low price, non-toxic, and tasteless. Its crystallinity is as high as 50%-70%. It has good thermal stability and its decomposition temperature can reach above 300 ° C. It is a general-purpose plastic. One of the highest heat resistance. Parts can be boiled and sterilized at 100°C. It can be used for a long time at 100-120 ℃; when it is not subjected to external force, it can be used at 150 ℃ without deformation. Good formability, high yield strength, high bending fatigue life. Therefore, polypropylene is widely used in the fields of automobiles, home appliances, daily necessities, films, fibers, and packaging. [0003] Polypropylene has low transparency and is a translucen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16C08L23/20C08L23/04C08L23/14C08K5/05C08K5/51C08K5/20C08K5/17C08K5/56B29B9/06B29C47/92
Inventor 张翼翔栾国俊钟卫平邱武平
Owner 浙江富丽新材料有限公司
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