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High-weld-mark-strength long glass fiber reinforced polypropylene composite material and preparation method thereof

A long glass fiber and composite material technology, which is applied in the field of polypropylene composite material preparation, can solve problems such as exacerbating the performance risk of injection molded parts, and achieve the effect of improving the strength of weld lines

Active Publication Date: 2022-04-12
SHANGHAI PRET COMPOSITES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This characteristic exacerbates the product performance risk of injection molded parts of such materials

Method used

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  • High-weld-mark-strength long glass fiber reinforced polypropylene composite material and preparation method thereof
  • High-weld-mark-strength long glass fiber reinforced polypropylene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Pour 31.4Kg polypropylene resin PP-1, 31.4Kg polypropylene resin PP-2, 2Kg antioxidant, 0.2Kg GH-1, 1Kg calcium stearate, 4Kg PP-g-MAH into the mixer, mix The material is uniform. At the same time, the glass fiber roll is placed on the creel, and the continuous glass fiber enters the mold cavity through the guide roller, tension frame, and yarn feeding plate, and passes through the die head on the other side of the cavity. After the above preparatory work is completed, start the extruder, pour the uniformly mixed material into the main feeding port of the extruder, and the molten resin will finally enter the mold cavity through the action of the screw shear block and the conveying block, and adhere to the traction machine. On the surface of glass fiber that moves due to force. The resin-wrapped glass fibers are water-cooled, air-dried, pelletized, and dried to finally form plastic particles with a length of 10mm-12mm and a glass fiber content of 30%.

Embodiment 2

[0047] Pour 31.35Kg polypropylene resin PP-1, 31.35Kg polypropylene resin PP-2, 2Kg antioxidant, 0.3Kg GH-1, 1Kg calcium stearate, 4Kg PP-g-MAH into the mixer, mix The material is uniform. At the same time, the glass fiber roll is placed on the creel, and the continuous glass fiber enters the mold cavity through the guide roller, tension frame, and yarn feeding plate, and passes through the die head on the other side of the cavity. After the above preparatory work is completed, start the extruder, pour the uniformly mixed material into the main feeding port of the extruder, and the molten resin will finally enter the mold cavity through the action of the screw shear block and the conveying block, and adhere to the traction machine. On the surface of glass fiber that moves due to force. The resin-wrapped glass fibers are water-cooled, air-dried, pelletized, and dried to finally form plastic particles with a length of 10mm-12mm and a glass fiber content of 30%.

Embodiment 3

[0049] Pour 31.3Kg polypropylene resin PP-1, 31.3Kg polypropylene resin PP-2, 2Kg antioxidant, 0.4Kg GH-1, 1Kg calcium stearate, 4Kg PP-g-MAH into the mixer, mix The material is uniform. At the same time, the glass fiber roll is placed on the creel, and the continuous glass fiber enters the mold cavity through the guide roller, tension frame, and yarn feeding plate, and passes through the die head on the other side of the cavity. After the above preparatory work is completed, start the extruder, pour the uniformly mixed material into the main feeding port of the extruder, and the molten resin will finally enter the mold cavity through the action of the screw shear block and the conveying block, and adhere to the traction machine. On the surface of glass fiber that moves due to force. The resin-wrapped glass fibers are water-cooled, air-dried, pelletized, and dried to finally form plastic particles with a length of 10mm-12mm and a glass fiber content of 30%.

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Abstract

The invention discloses a preparation method of a high-weld-mark-strength long glass fiber reinforced polypropylene composite material. The high-weld-mark-strength long glass fiber reinforced polypropylene composite material is prepared from the following raw materials in percentage by weight: 42.6-72.8% of polypropylene resin, 20-50% of continuous long glass fibers, 4% of a compatilizer, 2% of an antioxidant, 0.2-0.4% of a nucleating agent and 1% of a lubricant. Wherein the polypropylene resin adopts a random copolymerization type and a high crystallization type and adopts a 1: 1 blending scheme, and the nucleating agent is selected from organic phosphates and has the characteristics of low molecular weight, small viscosity and low interaction force with polymers. According to the formula design, on one hand, the interpenetration and entanglement degree of molecular chains when multiple strands of melts intersect is improved, on the other hand, ordered arrangement of the polymer molecular chains is facilitated, and finally the purpose of optimizing the strength of a weld mark area is achieved. Aiming at the welding mark injection molding defect inevitably existing due to the multi-pouring-gate design of a large injection molding part, the characteristic of high welding mark strength can effectively avoid the risk of product performance failure, and the design freedom degree of the part is further improved.

Description

technical field [0001] This patent relates to a high weld line strength long glass fiber reinforced polypropylene composite material and its preparation method, specifically, to a preparation method of a polypropylene composite material characterized by high weld line strength. Background technique [0002] Weld line is a common injection defect in injection molded parts, and it mostly appears in the grooves, holes or parts with uneven wall thickness. Its existence will not only affect the appearance of the product, but also affect the conventional mechanical properties of the parts such as stretching, bending, compression, etc., increasing the risk of product use. [0003] Long glass fiber reinforced polypropylene composite material is a high-performance engineering plastic with many advantages such as high rigidity, high toughness, fatigue resistance, and high cost performance. The particle length is generally 10mm-12mm, and the orientation of the glass fiber impregnated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/12C08K5/49C08K7/14C08J5/04
Inventor 宫浩张中伟何书珩张杨周炳张锴蔡莹蔡青周文
Owner SHANGHAI PRET COMPOSITES
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