Polypropylene composite material and preparation method thereof

A composite material and polypropylene technology, applied in the field of polypropylene composite material and its preparation, can solve the problems of external fiber wrapping, affecting the appearance of products, etc., and achieve the effects of good surface hardness, elimination of weld line defects, and excellent rigidity performance.

Inactive Publication Date: 2019-03-19
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Generally, in traditional injection molding, the extra fibers will be aligned with the flow direction of the molten plastic. If the molten plastic suddenly cools and solidifies on the mold wall due to insufficient mold cavity surface temperature during the filling process, the extra fibers will appear and cannot be completely absorbed. Encased in molten resin plastic
In addition, due to the difference in shrinkage characteristics between the external fiber and the resin plastic, when the molded product is cooled, the external fiber will be more likely to be exposed on the surface of the product and affect the appearance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Polypropylene resin 80kg, basalt fiber 5kg, syndiotactic 1,2-polybutadiene 5kg, N-vinylbenzyl-N-trimethoxysilylpropyl ethylenediamine salt 1kg, bromine Flame retardant FR-3B 5kg, ethylene bisstearamide 1kg, tris(nonylphenyl) phosphite 1kg, subnanometer barium sulfate 7kg, nanometer talcum powder 1kg, brightener A-388 0.5kg and ultraviolet absorber 2kg of the mixture obtained by mixing UV-531 and antioxidant 425 at a mass ratio of 1:1 was heated to 80°C and stirred for 10 minutes to obtain a mixture;

[0026]B. Put the mixture obtained in step A into the SHJ-50 twin-screw granulator to extrude and granulate. The temperature of each zone of the twin-screw granulator is controlled at: 140°C in the first zone, 180°C in the second zone, and 190°C in the third zone. ℃, the fourth zone is 200°C, the fifth zone is 220°C, the sixth zone is 200°C, the seventh zone is 190°C, the eighth zone is 180°C, the screw speed of the feeding motor is controlled at 50rpm, and the screw spe...

Embodiment 2

[0028] A. Polypropylene resin 100kg, carbon fiber 10kg, syndiotactic 1,2-polybutadiene 10kg, N-vinylbenzyl-N-trimethoxysilylpropyl ethylenediamine salt 2kg, bromine Combustion agent FR-3B 12kg, ethylene bis stearamide 2kg, tris(nonylphenyl) phosphite 3kg, 16kg of a mixture of subnanometer barium sulfate and nanometer calcium carbonate in a mass ratio of 1:1, nanometer talcum powder 2kg, Brightener A-3881kg, ultraviolet absorber UV-531 and antioxidant 425 are mixed at a mass ratio of 1:1 to obtain a mixture 4kg heated together to 80°C and stirred for 15 minutes to obtain a mixture;

[0029] B. Put the mixture obtained in step A into the SHJ-50 twin-screw granulator to extrude and granulate. The temperature of each zone of the twin-screw granulator is controlled at: 155°C in the first zone, 190°C in the second zone, and 210°C in the third zone. ℃, the fourth zone is 220°C, the fifth zone is 240°C, the sixth zone is 220°C, the seventh zone is 210°C, the eighth zone is 200°C, the ...

Embodiment 3

[0031] A. Polypropylene resin 120kg, glass fiber 15kg, syndiotactic 1,2-polybutadiene 15kg, N-vinylbenzyl-N-trimethoxysilylpropyl ethylenediamine salt 3kg, bromine Flame retardant FR-3B 20kg, ethylene bis stearamide 4kg, tris(nonylphenyl) phosphite 5kg, mixture of subnanometer barium sulfate and nanometer calcium carbonate 25kg, nanometer talcum powder 3kg, brightener A- 3882kg and 6kg of the mixture of ultraviolet absorber UV-531 and antioxidant 425 mixed in a mass ratio of 1:1 were heated together to 80°C and stirred for 20min to obtain the mixture;

[0032] B. Put the mixture obtained in step A into the SHJ-50 twin-screw granulator to extrude and granulate. The temperature of each zone of the twin-screw granulator is controlled at: 170°C in the first zone, 200°C in the second zone, and 230 in the third zone. ℃, the fourth zone is 240°C, the fifth zone is 260°C, the sixth zone is 240°C, the seventh zone is 230°C, the eighth zone is 220°C, the screw speed of the feeding motor...

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Abstract

The invention belongs to the technical field of high polymer material mixing modification, in particular to a polypropylene composite material and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 80-120 parts of polypropylene resins, 5-15 parts of reinforcing agents, 5-15 parts of toughening agents, 1-3 parts of coupling agents, 5-20 partsof flame retardants, 1-4 parts of dispersing agents, 1-5 parts of heat stabilizers, 7-25 parts of fillers, 1-3 parts of nucleating agents, 0.5-2 parts of gloss modifiers and 2-6 parts of weathering agents. The material has high appearance glossiness, good rigidity and strength performance, long service life, light weight and simple and easy preparation.

Description

technical field [0001] The invention belongs to the technical field of polymer material blending modification, and in particular relates to a polypropylene composite material and a preparation method thereof. Background technique [0002] High-gloss seamless injection molding uses steam, hot oil, electric heating, etc. to rapidly heat up the mold surface, so that the surface temperature of the molding cavity reaches above the glass transition temperature of the resin plastic, and then starts injection molding. When the cavity filling process is completed Immediately after using cooling media such as water, oil, and cold air, the temperature on the surface of the mold cavity is rapidly dropped below the glass transition temperature of the resin plastic, thereby changing the surface characteristics of plastic products. An advanced injection molding processing method. [0003] Large-scale appearance parts such as automotive bright ventilation grilles, car bumpers, and flat-pane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L47/00C08K13/04C08K7/10C08K3/30C08K3/34C08K3/26C08K7/14B29C48/92
CPCC08K2003/3045C08K2201/011C08L23/12C08L2205/24C08L47/00C08K13/04C08K7/10C08K3/30C08K3/34C08K7/06C08K3/26C08K7/14
Inventor 袁毅黄美娜刘昌东谢道伟陈丹
Owner CHONGQING TECH & BUSINESS UNIV
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