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Low-shrinkage modified polypropylene material

A polypropylene material, low shrinkage technology, applied in the field of low shrinkage modified polypropylene materials and modified polypropylene materials, can solve the problem of difficult to greatly control or reduce polypropylene shrinkage, mechanical properties decline, material modification Can not meet the actual needs and other problems

Active Publication Date: 2016-01-06
SUZHOU RUNJIA ENGINEER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Studies have found that crystallization and orientation are the main reasons for the shrinkage of PP products. In the prior art, it is usually difficult to greatly control or reduce the shrinkage of polypropylene by relying on a single component or a single technical improvement. Even if the shrinkage of polypropylene is reduced, It is often based on the premise of sacrificing other properties of the material. For example, although the shrinkage rate of polypropylene drops below 1%, or even reaches 0.6%, its mechanical properties drop a lot, and the modification of the material cannot meet the actual needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In terms of parts by mass, take 40 parts of polypropylene resin, 2 parts of tetrapod zinc oxide whiskers modified by silane coupling agent, 10 parts of a mixture of nano calcium carbonate and micron titanium dioxide, wherein nano calcium carbonate and micron titanium dioxide The mass is equal, and the particle size of titanium dioxide is 3.0 microns. 0.05 part of aryl carboxylic acid α-nucleating agent, 1 part of sulfate ester antioxidant, and 5 parts of high-density polyethylene are blended in a high-speed mixer and stirred evenly. The stirring time is 3 minutes and the rotation speed is 1000r / min;

[0025] Then put the mixture obtained above into a twin-screw extruder for melting and kneading, then extrude, pelletize and dry to obtain a modified low-shrinkage polypropylene material.

Embodiment 2

[0027] The preparation method of Example 2 is the same as that of Example 1, the distribution ratio of each component is shown in Table 1, and the performance test data is shown in Table 2. Wherein the inorganic powder adopts nanometer talc powder and 5.0 micron titanium dioxide in mass percentage each accounting for 50%, and the antioxidant adopts phosphite antioxidant, and the rest of the components are the same as in Example 1.

[0028] The components of Examples 3-4 are the same as those in Example 2, see Table 1 for the distribution ratio of each component, and see Table 2 for the performance test data.

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Abstract

The invention discloses a low-shrinkage modified polypropylene material. The material is prepared from the following raw materials in parts by weight: 40-80 parts of polypropylene resin, 2-5 parts of tetrapod-shaped ZnO whisker, 10-20 parts of inorganic powder, 0.05-1.2 parts of an alpha-nucleating agent, 1-5 parts of an anti-oxidant, and 5-30 parts of high density polyethylene; the polypropylene resin is co-polypropylene K9026, and in a test condition of 230 DEG C x 2.16kg, the melt flow rate of the co-polypropylene K9026 is 30g / 10min. Synergism of the whisker, the high density polyethylene and the inorganic powder is used, especially the tetrapod-shaped ZnO whisker is added, so that the moulding shrinkage of the polypropylene is substantially reduced, and the mechanical property of the material is substantially improved.

Description

technical field [0001] The invention relates to a modified polypropylene material, in particular to a low-shrinkage modified polypropylene material, which belongs to the technical field of polymer composite materials. Background technique [0002] Polypropylene is a semi-crystalline resin, and its molding shrinkage is generally 1.4-2.6%. It is compatible with acrylonitrile-butadiene-styrene terpolymer (ABS), polystyrene (PS), polycarbonate (PC) Compared with other amorphous materials (0.4-0.8% molding shrinkage), it is much larger. The molding shrinkage here, also known as the secondary shrinkage, refers to the dimensional difference between the injection molded product and the mold cavity after the material is injection molded. The shrinkage control of polypropylene has a great influence on its application range. Shrinkage often occurs during the injection molding, storage and use of the product, resulting in warping of the product, local internal stress and unstable produ...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08L23/06C08K13/06C08K9/06C08K3/22C08K3/26C08K3/34C08K7/08
CPCC08K2201/003C08K2201/011C08L23/14C08L2205/24C08L2207/062C08L23/06C08K13/06C08K9/06C08K2003/2241C08K2003/265C08K7/08C08K3/34
Inventor 翁永华汪理文丁贤麟
Owner SUZHOU RUNJIA ENGINEER PLASTIC
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