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Low-shrinkage and low-density modified polypropylene composite material and preparation method thereof

A composite material and polypropylene technology, applied in the field of low shrinkage, low density modified polypropylene composite material and its preparation, can solve the problem of affecting the flow characteristics of polypropylene melt, unfavorable processing of polypropylene composite material, and affecting the comprehensive performance of materials, etc. Problems, to achieve good market prospects and economic benefits, low density, low shrinkage effect

Inactive Publication Date: 2017-12-22
BEIJING INST OF AEROSPACE TESTING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above published patents have certain effects on reducing the shrinkage of polypropylene, more inorganic fillers need to be added to the system, resulting in a significant increase in the proportion of polypropylene; adding other resin materials will affect the flow characteristics of polypropylene melt. It is not conducive to the processing of polypropylene composite materials, thus affecting the overall performance of the material

Method used

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  • Low-shrinkage and low-density modified polypropylene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, the long fiber reinforced resin is prepared as follows:

[0030] First, 45.6kg of polypropylene PP BJ356MO (melt index 100g / 10min), 4kg of compatibilizer maleic anhydride grafted polypropylene (grafting rate 0.8%), 0.2kg of tetrakis [β-(3,5- Di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 0.2kg of β, β'-thiodipropionic acid distearate are mixed evenly, then added to the twin-screw extruder for high-temperature melting , the temperature of the extruder is set at 240°C, the mixture is melted and blended by the extruder to obtain a high-temperature melt, and the high-temperature melt is transported to the impregnation mold, and the mold temperature is set at 250°C. After being extruded from the die, 50kg of non-alkali continuous long glass fiber is transported to the impregnation mould. The fiber-reinforced polypropylene strips are introduced into a pelletizer for granulation, and the length of the particles is controlled at 10-30mm, ...

Embodiment 2

[0032] In this embodiment, the long fiber reinforced resin is prepared as follows:

[0033]First, 55.6kg of polypropylene PP SK3920 (melt index 100g / 10min), 4kg of compatibilizer maleic anhydride grafted polypropylene (Shenyang Ketong KT-1, grafting rate 1.0%), 0.2kg of tetra[ β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 0.2kg of β, after the β'-thiodipropionic acid distearate is mixed uniformly, join the twin-screw High-temperature melting is carried out in the extruder, and the temperature of the extruder is set at 240°C. The mixture is melted and blended by the extruder to obtain a high-temperature melt, and the high-temperature melt is transported to the impregnation mold, and the mold temperature is set at 250°C , after the melt is filled with the mold and extruded from the die, transport 40kg of basalt fiber to the impregnation die, after the basalt fiber is dispersed and impregnated by the high-temperature melt, it is extruded from the die, a...

Embodiment 3

[0035] In this embodiment, the long fiber reinforced resin is prepared as follows:

[0036] First, 55.6kg of nylon 6 (China Baling Petrochemical YH160, relative viscosity 1.64), 4kg of compatibilizer maleic anhydride graft POE (Shenyang Ketong KT-9, grafting rate 0.8%), 0.2kg of four [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 0.2kg of β, β'-thiodipropionic acid distearate are mixed evenly, then added to bis High-temperature melting is carried out in the screw extruder, and the temperature of the extruder is set at 240°C. After the mixture is melted and blended by the extruder, a high-temperature melt is obtained. The high-temperature melt is transported to the impregnation mold, and the mold temperature is set at 250°C. ℃, after the melt is filled with the mold and extruded from the die, transport 40kg of carbon fiber to the impregnation die, after the basalt fiber is dispersed and impregnated by the high-temperature melt, it is extruded from...

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Abstract

The invention relates to a low-shrinkage and low-density modified polypropylene composite material and a preparation method thereof. The polypropylene composite material is prepared from the following raw materials in percentage by weight: 50 percent to 80 percent of polypropylene (PP), 5 percent to 40 percent of long fiber enhanced resin, 1 percent to 10 percent of a compatilizer, 1 percent to 20 percent of a toughening agent, 0.2 percent to 1 percent of an antioxidant and 0.2 percent to 1 percent of an anti-UV (Ultraviolet) agent. According to the preparation method provided by the invention, after the long fiber enhanced resin is prepared, the long fiber enhanced resin, the PP and other components are blended to uniformly disperse fibers in a polypropylene melt and the performance of the composite material is greatly improved. The low-shrinkage and low-density modified polypropylene composite material provided by the invention has excellent mechanical properties and also has the characteristics of low shrinkage rate and low density.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a low-shrinkage, low-density modified polypropylene composite material and a preparation method thereof. Background technique [0002] Modified polypropylene composite material is one of the materials widely used in the automobile industry. Due to the large shrinkage rate of pure polypropylene resin, easy shrinkage and deformation, and low heat distortion temperature, talcum powder, calcium carbonate, barium sulfate or silica fume are usually used Mineral fillers such as stone are filled with modified polypropylene to reduce its shrinkage and improve dimensional stability and heat distortion temperature. Taking the materials of automobile bumpers, instrument panels and door panels as examples, they are generally filled with 20% mineral fillers. [0003] Although the shrinkage of mineral-filled modified polypropylene has been improved, its density has increased from 0.9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L25/08C08L23/08C08L51/06C08L77/02C08L77/10C08K13/04C08K7/14C08K7/10C08K7/06C08K5/134C08K5/372C08J5/04B29B9/06
CPCC08J5/042C08J5/043C08J5/046C08J2323/12C08J2377/02C08K2201/003C08L23/12C08L77/02C08L2205/02C08L2205/035C08L2205/16C08J5/0405C08L51/06C08K7/14C08K5/1345C08K5/372C08K7/10C08K7/06C08L77/10C08L25/08C08L23/0815C08K13/04
Inventor 孟征孙兆懿钱晶贺芳吴超黄兴宇苏昱郭新利安峻莹陈婧舒帮建
Owner BEIJING INST OF AEROSPACE TESTING TECH
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