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High-strength light-weight thin-wall polypropylene composition for injection molding

A polypropylene composition and lightweight technology, which is applied in the field of polypropylene composition, high-strength, lightweight and thin-walled polypropylene composition for injection molding, can solve the problems of unsatisfactory practical application and reduced rigidity of parts, and achieve surface quality Good, light weight, low density effect

Active Publication Date: 2016-06-15
SUZHOU RUNJIA ENGINEER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in thin-walled injection molding, the decrease in wall thickness will lead to a serious decrease in the rigidity of the parts, which cannot meet the requirements of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, weigh 100 parts of polypropylene resin, 20 parts of 1-butene oligomer, 1 part of nano-montmorillonite nucleating agent, and 1 part of EPDM grafted glycidyl methacrylate compatibilizer by weight fraction. 1 part, 1 part of maleic anhydride grafted POE, the number average molecular weight of 1-butene oligomer is less than 10000, and the polypropylene resin is a polypropylene resin with a C6-C8 long chain branch structure.

[0020] The melt flow rate of the polypropylene resin was 45 g / 10 minutes, and the melt flow rate measurement was performed according to ASTM D-1238, condition 230° C. / 2.16 kg kg weight.

[0021] Secondly, the above-mentioned composition is injection-molded to obtain an injection molded part, and the performance of the injection molded part is tested:

[0022] According to the ISO180 test standard, the notched impact strength at 23°C is 31kJ / m 2 , according to the ISO180 test standard, the notched impact strength at -30°C is 6kJ / m 2 , according...

Embodiment 2

[0024] First, take 100 parts of polypropylene resin by weight fraction, 25 parts of α-olefin oligomer, 3 parts of nucleating agent, 2 parts of compatibilizer, 8 parts of maleic anhydride grafted POE, the α-olefin oligomer It is an oligomer with a number average molecular weight less than 10,000, and the polypropylene resin is a polypropylene resin with a C6-C8 long chain branch structure. The melt flow rate of the polypropylene resin was 75 g / 10 minutes, and the melt flow rate was measured according to ASTM D-1238, condition 230° C. / 2.16 kg kg weight.

[0025] Secondly, the above-mentioned composition is injection-molded to obtain an injection molded part, and the performance of the injection molded part is tested:

[0026] According to the ISO180 test standard, the notched impact strength at 23°C is 40kJ / m 2 , according to the ISO180 test standard, the notched impact strength at -30°C is 8kJ / m 2 , according to the ISO527 test standard, the tensile strength is 29Mpa. The de...

Embodiment 3

[0028] First, take 100 parts of polypropylene resin by weight fraction, 30 parts of α-olefin oligomer, 8 parts of nucleating agent, 4 parts of compatibilizer, 5 parts of maleic anhydride grafted POE, and the α-olefin oligomer It is an oligomer with a number average molecular weight less than 10,000, and the polypropylene resin is a polypropylene resin with a C6-C8 long chain branch structure. The melt flow rate of the polypropylene resin was 55 g / 10 minutes, and the melt flow rate was measured according to ASTM D-1238, condition 230°C / 2.16 kg kg weight.

[0029] Secondly, the above-mentioned composition is injection-molded to obtain an injection molded part, and the performance of the injection molded part is tested:

[0030] According to the ISO180 test standard, the notched impact strength at 23°C is 36kJ / m 2 , according to the ISO180 test standard, the notched impact strength at -30°C is 6kJ / m 2 , according to the ISO527 test standard, the tensile strength is 26Mpa. The ...

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Abstract

The invention discloses a high-strength light-weight thin-wall polypropylene composition for injection molding. The polypropylene composition is prepared from, by weight, 100 parts of polypropylene resin, 20-30 parts of an alpha-olefin oligomer, 1-10 parts of a nucleating agent, 1-5 parts of a compatilizer and 1-10 parts of maleic anhydride-grafted POE, wherein an oligomer with the number-average molecular weight smaller than 10,000 is adopted as the alpha-olefin oligomer, and polypropylene resin with a C6-C8 long-chain branch structure is adopted as the polypropylene resin. An injection molding part made of the polypropylene composition is small in density and weight, excellent in mechanical property, capable of being widely applied to automobile industry, good in surface quality and free of surface problems such as flow marks, tiger skin patterns and sink marks.

Description

technical field [0001] The invention relates to a polypropylene composition, in particular to a high-strength lightweight polypropylene composition for thin-wall injection molding, and belongs to the technical field of polymer materials. Background technique [0002] At present, the development of the automobile industry is facing challenges from energy, environment and many other aspects, and the demand for lightweight is also imminent. For every 100kg reduction in vehicle weight, fuel consumption can be reduced by 0.3-0.6L / 100km, CO 2 The emission is reduced by 5-8g / km, and the use of thin-walled components is one of the quick and effective means to achieve the goal of lightweighting. Mahishi and Maloney define thin-wall injection molding as injection molding with a flow length thickness ratio of L / T (L: Length, flow length; T: Thickness, thickness of plastic parts; L / T is also referred to as flow length ratio) above 100 or 150 as Thin wall injection molding. In the fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L51/06C08L51/04C08K3/34C08K3/26C08K3/36
CPCC08L23/12C08K2201/011C08L2205/08C08L2205/24C08L2205/02C08L2205/03C08L51/06C08L51/04C08K3/346C08L51/003C08K2003/265C08K3/34C08K3/36
Inventor 汪理文李庆贵孙兆才翁永华丁贤麟
Owner SUZHOU RUNJIA ENGINEER PLASTIC