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A kind of polypropylene modified plastic with high rigidity and low warpage and preparation method thereof

A technology of polypropylene and low warpage, which is applied in the field of high rigidity and low warpage polypropylene modified plastics and its preparation. It can solve the problems that glass fiber and polypropylene are easy to warp, affect product appearance and assembly, etc., and achieve improvement Effects of rigidity and warpage resistance, reduction of warpage, and reduction of transverse and longitudinal shrinkage ratios

Active Publication Date: 2021-01-15
东莞市高能高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the addition of glass fibers to polypropylene materials has solved the rigidity problem of polypropylene materials, the introduction of glass fibers has brought another problem, that is, glass fibers and polypropylene are easy to warp during the molding process, thus affecting the product. appearance and assembly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the polypropylene modified plastic with high rigidity and low warpage of the present embodiment comprises the following steps:

[0025] Mixing step: first mix and stir polypropylene, grafted polypropylene, and high-impact polystyrene, then add α-nucleating agent, antioxidant and lubricant and stir to obtain a mixture;

[0026] Extrusion steps: put the compound into the extruder from the main feeding port of the extruder, put the glass fiber into the extruder from the side feeding port, control the extrusion temperature of the extruder to 160 °C, and the temperature of the extruder The speed is 300r / min;

[0027] Water-cutting step: after extrusion, water-cutting is carried out, the length of water-passing is 1.95 meters, and the particle size of cutting is controlled to 2.8 mm, so as to obtain the polypropylene modified plastic;

[0028] Wherein, the mass percent of the raw material that adds is:

[0029] 65% polypropylene, 25% glass fiber, 1...

Embodiment 2

[0032] The preparation method of the polypropylene modified plastic with high rigidity and low warpage of the present embodiment comprises the following steps:

[0033] Mixing step: first mix and stir polypropylene, grafted polypropylene, and high-impact polystyrene, then add α-nucleating agent, antioxidant and lubricant and stir to obtain a mixture;

[0034] Extrusion steps: put the compound into the extruder from the main feeding port of the extruder, put the glass fiber into the extruder from the side feeding port, control the extrusion temperature of the extruder to 170°C, and the temperature of the extruder The speed is 350r / min;

[0035] Water-cutting step: carry out water-cutting after extrusion, the length of water-passing is 2 meters, and the cutting particle size is controlled to 3 mm, so as to obtain the polypropylene modified plastic;

[0036] Wherein, the mass percent of the raw material that adds is:

[0037] 57% polypropylene, 30% glass fiber, 2.6% grafted pol...

Embodiment 3

[0040] The preparation method of the polypropylene modified plastic with high rigidity and low warpage of the present embodiment comprises the following steps:

[0041] Mixing step: first mix and stir polypropylene, grafted polypropylene, and high-impact polystyrene, then add α-nucleating agent, antioxidant and lubricant and stir to obtain a mixture;

[0042] Extrusion steps: Put the compound into the extruder from the main feeding port of the extruder, put the glass fiber into the extruder from the side feeding port, control the extrusion temperature of the extruder to 180°C, and the temperature of the extruder The speed is 400r / min;

[0043] Water-cutting step: carry out water-cutting after extrusion, the length of water-passing is 2.05 meters, and the cutting particle size is controlled to 3.3mm, so as to obtain the polypropylene modified plastic;

[0044] Wherein, the mass percent of the raw material that adds is:

[0045] 60% polypropylene, 27% glass fiber, 3% grafted p...

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Abstract

The invention relates to the technical field of modified plastics, particularly to a high-rigidity and low-warpage polypropylene modified plastic and a preparation method thereof, wherein the high-rigidity and low-warpage polypropylene modified plastic is prepared from 55-65% of polypropylene, 25-30% of glass fiber, 1-3% of grafted polypropylene, 7-10% of high-impact-resistant polystyrene, 0.1-0.3% of an alpha-nucleating agent, 0.1-0.5% of an antioxidant, and 0.2-0.5% of a lubricant. According to the present invention, by introducing the high-impact-resistant polystyrene into the composite material of the polypropylene and the glass fiber, the crystallization of polypropylene along the glass fiber direction is prevented so as to reduce the warpage of the polypropylene modified plastic, andthe flowing of the polypropylene chain segment along the same direction is effectively prevented through the high-impact-resistant polystyrene part incompatible to the polystyrene so as to further improve the rigidity and the warpage resistance of the polypropylene modified plastic, such that the prepared polypropylene modified plastic integrates the high rigidity and the low warpage.

Description

technical field [0001] The invention relates to the technical field of modified plastics, in particular to a polypropylene modified plastic with high rigidity and low warpage and a preparation method thereof. Background technique [0002] As the country pays more attention to environmental protection, it is more and more common to replace steel with plastic. The rigidity of plastic products is lower than that of steel products. Therefore, it is necessary to improve the rigidity of plastic products while replacing steel with plastic. In the prior art, glass is generally used. Fiber-reinforced polypropylene material is rigid, and glass fiber is cheap. Therefore, polypropylene material using glass fiber is widely used in many fields such as home appliances, sports equipment, and automobiles. [0003] Although the addition of glass fibers to polypropylene materials has solved the rigidity problem of polypropylene materials, the introduction of glass fibers has brought another pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L51/06C08L51/04C08K13/04C08K7/14
CPCC08L23/12C08L2205/02C08L2205/035C08L51/06C08L51/04C08K13/04C08K7/14
Inventor 杨鹏彭玉敏祝学远胡双飞刘光锋
Owner 东莞市高能高分子材料有限公司
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