High-temperature-resistant glass fiber reinforced polypropylene composite material

Abstract

The invention belongs to the technical field of glass fiber reinforced polypropylene composite materials and particularly relates to a high-temperature-resistant glass fiber reinforced polypropylene composite material. The composite material contains the following raw materials: polypropylene, high-density low-pressure polyethylene, alkali-free glass fibers, modified basalt fibers, polypropylene grafted maleic anhydride, sodium stearate, wollastonite powder and a silane coupling agent. Compared with the prior art, the composite material has the advantages that basalt fibers are modified and generate a synergistic effect with high-density low-pressure polyethylene and alkali-free glass fibers, so that the crystal form of polypropylene can be changed, the crystal size is increased, the gapsamong the crystals are increased and can be effectively filled with sodium stearate, wollastonite powder and the like, the mutual effect among the crystals is guaranteed, the stress in the crystals isguaranteed, the mechanical property of the composite material is improved, meanwhile, the high-temperature resistance of the material is improved, and the use range is further broadened.

Description

technical field [0001] The invention belongs to the technical field of glass fiber reinforced polypropylene composite materials, in particular to a high temperature resistant glass fiber reinforced polypropylene composite material. Background technique [0002] Polypropylene is a crystalline polymer with a relatively regular structure. It has good performance, low density, low cost, large output, good chemical stability, easy processing and recyclability. It has been widely used in daily necessities, automobiles, home appliances, etc. field, but the polypropylene molding shrinkage rate is large, it is very sensitive to the gap, it is easy to crack at low temperature, and the impact performance is poor. In order to solve the above problems, the existing technology uses glass fiber to modify the polypropylene material to make it have better rigidity. In application, instead of engineering plastics, the crystallization properties of the modified polypropylene material will be g...

AI Technical Summary

Problems solved by technology

[0002] Polypropylene is a crystalline polymer with a relatively regular structure. It has good performance, low density, low cost, large output, good chemical stability, easy processing and recyclability. It has been widely used in daily necessities, automobiles, home appliances, etc. field, but the polypropylene molding shrinkage rate is large, it is very sensitive to the gap, it is easy to crack at low temperature, and the impact performance is poor. In order to solve the above problems, the existing technology uses glass fiber to modify the polypropylene material to make it have better rigidity. In application, instead of engineering plastics, the crystallization properties of the modified polypropylene material will be greatly changed, which will affect the mechanical properties. However, due to the difference in horizontal and vertical shrinkage, the glass fiber reinforced polypropylene material will warp seriously, and there are Some improvements made specifically for warpage, but the effect is not good, and the effect is not satisfactory in terms of heat welding sealing and compressive strength; in order to solve this problem, the application number 201710478880.7 discloses a low warpage Non-toxic, easy to weld, high pressure glass fiber reinforced polypropylene material, by adding whiskers with specific content and specific aspect ratio to polypropylene matrix resin, supplemented with specific content of polyethylene and specific content of nucleating agent , through the compounding of various components, the difference in transverse shrinkage of glass fiber reinforced polypropylene material is improved, the warpage of the material is fundamentally improved, the welding sealing performance is greatly improved, and the glass fiber reinforced polypropylene material is broadened. The application range of polypropylene material; basalt fiber is made of natural basalt ore as raw material, high-temperature melting wire drawing, has good electrical insulation performance, is a new high-strength material, used in polypropylene can improve the resistance of polypropylene matrix Thermal properties and corrosion resistance are of great significance in practical applications, but interfacial transverse crystals will also appear, resulting in uneven crystallization of the matrix, affecting the performance of composite materials, and prone to internal stress and cracks, resulting in a decline in mechanical properties; With the continuous improvement of material performance requirements, glass fiber reinforced polypropylene materials cannot meet the high-strength mechanical requirements, and at the same time cannot meet the heat resistance performance, and only using basalt fibers will also have problems affecting material performance. Therefore, it is necessary to compound polypropylene Further research on the preparation method of the material

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