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High-surface-smoothness long-glass-fiber-reinforced polypropylene composite material and preparation method thereof

A technology of long glass fibers and polypropylene materials, applied in the field of polypropylene composite materials, can solve the problems of reducing the fluidity of crystalline polymer substrates, limiting applications, and increasing material costs, achieving good low VOC emission performance and simplifying production processes , the effect of excellent appearance performance

Inactive Publication Date: 2016-04-13
SHANGHAI PRET COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during the injection molding process, a high proportion of reinforcement phase materials, such as glass fibers, carbon fibers or other reinforcement materials, will reduce the fluidity of rapidly solidifying crystalline polymer substrates if the fibers cannot be impregnated sufficiently and uniformly, especially In the case of a high reinforcement ratio and a molded product with a large wall thickness, it is easy to cause performance degradation and surface quality degradation of the resulting reinforced composite material
[0005] For a long time, the surface finish of automotive exterior parts made of long glass fiber reinforced materials has been a topic of concern in the industry. Since long glass fibers are polar materials with obvious orientation, their compatibility with non-polar matrix resins is poor Although a certain amount of compatibilizer is added to improve the bonding force of the two interfacial phases, the surface is easy to expose fibers, floating fibers, and even the phenomenon of glass fiber agglomeration still occurs from time to time, which greatly limits the long glass fiber reinforced polymer. The application of propylene material, a cost-effective material, in automotive appearance parts
However, if some additives that are conducive to the dispersion of glass fiber are added to the matrix formula, it will not only increase the risk of VOC emission from the material, but also cause great pressure on the increase in material cost, which is not conducive to popularization and use.

Method used

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  • High-surface-smoothness long-glass-fiber-reinforced polypropylene composite material and preparation method thereof
  • High-surface-smoothness long-glass-fiber-reinforced polypropylene composite material and preparation method thereof
  • High-surface-smoothness long-glass-fiber-reinforced polypropylene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Use the TE-65 (length-to-diameter ratio 1 / D=48) twin-screw extruder with side feed port, add 1500 grams of polypropylene resin PP-1 at the main feed port, add 48 at the side feed port gram of black mother, 2 grams of 1,4-(bis-tert-butylperoxy)dicumene and 50 grams of maleic anhydride. The processing temperatures (from the feed port to the die) are: 150°C, 190°C, 200°C, 220°C, 240°C, 240°C, 260°C, 265°C, and the speed of the main machine is 350rpm.

[0038] The compound and the continuous glass fiber melted and reacted by the extruder adopt the pultrusion process, the impregnation temperature is 260°C, and the fiber weight percentage is 20% and the length is the same as the resin pellet. The long glass fiber reinforced PP pellets with the same material length were used to prepare standard mechanical test samples by injection molding machine. The test results are shown in Table 1.

Embodiment 2

[0040] Use the TE-65 (length-to-diameter ratio 1 / D=48) twin-screw extruder with side feed port, add 1500 grams of polypropylene resin PP-2 at the main feed port, add 48 at the side feed port gram of black mother, 2 grams of 1,4-(bis-tert-butylperoxy)dicumene and 50 grams of maleic anhydride. The processing temperatures (from the feed port to the die) are: 150°C, 190°C, 200°C, 220°C, 240°C, 240°C, 260°C, 265°C, and the speed of the main machine is 350rpm.

[0041] The compound and the continuous glass fiber melted and reacted by the extruder adopt the pultrusion process, the impregnation temperature is 260°C, and the fiber weight percentage is 20% and the length is the same as the resin pellet. The long glass fiber reinforced PP pellets with the same material length were used to prepare standard mechanical test samples by injection molding machine. The test results are shown in Table 1.

Embodiment 3

[0043] Use the TE-65 (length-to-diameter ratio 1 / D=48) twin-screw extruder with side feed port, add 1500 grams of polypropylene resin PP-3 at the main feed port, add 48 at the side feed port gram of black mother, 2 grams of 1,4-(bis-tert-butylperoxy)dicumene and 50 grams of maleic anhydride. The processing temperatures (from the feed port to the die) are: 150°C, 190°C, 200°C, 220°C, 240°C, 240°C, 260°C, 265°C, and the speed of the main machine is 350rpm.

[0044] The compound and the continuous glass fiber melted and reacted by the extruder adopt the pultrusion process, the impregnation temperature is 260°C, and the fiber weight percentage is 20% and the length is the same as the resin pellet. The long glass fiber reinforced PP pellets with the same material length were used to prepare standard mechanical test samples by injection molding machine. The test results are shown in Table 1.

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Abstract

The invention discloses a high-surface-smoothness long-glass-fiber-reinforced polypropylene composite material and a preparation method thereof. The composite material is composed of the following components in percentage by weight: 20-60% of long glass fiber and 80-40% of modified polypropylene resin. The modified polypropylene resin is prepared by carrying out reaction extrusion on the existing commercial polypropylene resin by a double screw extruder and other melt impregnators. People do not need to previously independently produce or purchase the high-flowability modified polypropylene resin, thereby simplifying the production technique. The product has the advantages of excellent surface properties, no exposed glass fiber, favorable smoothness, favorable heat resistance and high processability, and is especially suitable for appearance parts with high requirements for surface grade and color combination. The product disclosed by the invention has favorable mechanical properties, such as favorable tensile strength, bending strength and impact resistance. The composite material also has the characteristics of low smell, low VOC (volatile organic compound) and the like.

Description

technical field [0001] The invention relates to a polypropylene composite material, in particular to a high surface smoothness, long glass fiber reinforced polypropylene composite material and a manufacturing method thereof. Background technique [0002] With the rapid development of the automobile industry, the per capita occupancy of passenger cars has been rising steadily, which is accompanied by the increasing demand for automobile materials, and the requirements for various aspects of materials are also getting higher and higher. Among the automotive interior materials currently on the market, cost performance is an indicator that OEMs are very concerned about. Compared with PC / ABS, PA6, 6-GF and other materials, long glass fiber reinforced polypropylene materials have a good balance of rigidity and toughness, and can It satisfies the mechanical performance requirements of many parts in the car, and at the same time, the price is low, and has great market development an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K13/04C08K7/14C08K5/14C08K5/1539C08K3/04B29C70/52
CPCC08K13/04B29C70/52C08K3/04C08K5/14C08K5/1539C08K7/14C08L2201/08C08L23/12
Inventor 钟颖陈永东李宏张祥福周文
Owner SHANGHAI PRET COMPOSITES
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