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Glass fiber-reinforced polypropylene material with shallow shrinkage mark and low warpage as well as preparation method and application thereof

A polypropylene material, low warpage technology, applied in the field of modified plastics, can solve the problems of reduced impact strength, slow cooling and solidification speed, poor physical properties of materials, etc., achieve high bending strength and flexural modulus, and increase cooling and solidification speed , the effect of high surface gloss

Active Publication Date: 2012-12-12
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large shrinkage rate of the polypropylene material itself and the crystalline material, the cooling and solidification speed after injection molding is slow, and there are positions where the thickness changes in the part, and sink marks are prone to appear. This surface defect seriously affects the appearance of the product. degree, and is still visible after spraying, which greatly limits the use of polypropylene materials in exterior parts
In addition, using the existing ordinary glass fiber reinforced polypropylene production process, the glass fiber will be oriented during the molding process, and warping will occur, so that glass fiber reinforced polypropylene can be used in mechanical parts that require high precision dimensions and flatness. App is restricted
[0003] Chinese patent CN 1315465A discloses a low warpage glass fiber reinforced polypropylene material, but because the matrix resin is polypropylene and polystyrene alloy, the compatibility between the two is poor, the physical properties of the obtained material are poor, and the impact strength is reduced. The material is brittle; Chinese patent CN 102264839 A discloses a reinforced nylon material with shallow sink marks and good appearance effects. By adding amorphous polyamide to semi-crystalline nylon, it can achieve good appearance and have shallow sink marks.

Method used

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  • Glass fiber-reinforced polypropylene material with shallow shrinkage mark and low warpage as well as preparation method and application thereof
  • Glass fiber-reinforced polypropylene material with shallow shrinkage mark and low warpage as well as preparation method and application thereof
  • Glass fiber-reinforced polypropylene material with shallow shrinkage mark and low warpage as well as preparation method and application thereof

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Embodiment 1-6

[0026] A glass fiber reinforced polypropylene material with shallow sink marks and low warpage, its raw material composition is as shown in table 1, and its preparation method comprises the following steps:

[0027] Mix raw materials other than chopped glass fiber and feed from the main feed port of the twin-screw extruder; chopped glass fiber is fed from the side feed port of the twin-screw extruder; raw materials are fed in the extruder After melting, extruding and granulating, a glass fiber reinforced polypropylene material with shallow sink marks and low warpage can be obtained. The pellets were injection molded into mechanical specimens for testing, and the test results are shown in Table 2.

[0028] In Table 1, the melt index of homopolypropylene is 5g / min (230°C, 2.16kg), the melt index of copolymerized polypropylene tree is 50g / min (230°C, 2.16kg), and the melt index of high crystalline polypropylene is 15g / min (230°C, 2.06kg). The melt index of polypropylene grafted...

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Abstract

The invention discloses a glass fiber-reinforced polypropylene material with shallow shrinkage mark and low warpage as well as a preparation method and an application of the glass fiber-reinforced polypropylene material. The polypropylene material is prepared by using the following raw materials including 45-79% of polypropylene, 15-30% of chopped glass fiber, 1-20% of mineral fillers and 2-5% of grafted polypropylene, wherein the polypropylene includes high crystalline polypropylene as well as homopolymerized polypropylene and / or copolymerized polypropylene; the mineral fillers are one or more of barium sulfate, calcium carbonate or mica.The preparation method for preparing the glass fiber-reinforced polypropylene material provided by the invention uses the high crystalline polypropylene, the added chopped glass fiber and the mineral fillers for composite reinforcement and can effectively increase the cooling and curing rates of the material during the injection moulding process. The prepared product has the characteristics of shallow shrinkage mark, low warpage and high surface gloss, has the advantages of high flexural strength and modulus, good processability and low cost, can be used in household appliances and automotive industries, and can replace engineering plastic, and meet the requirements of high dimensional stability, high wrap and high mechanical properties of the parts.

Description

technical field [0001] The invention belongs to the field of modified plastics, and in particular relates to a glass fiber reinforced polypropylene material with shallow sink marks and low warpage, a preparation method and application thereof. Background technique [0002] Glass fiber reinforced polypropylene has the advantages of high mechanical strength, good heat resistance, chemical corrosion resistance, dimensional stability, etc. It is widely used in household appliances, automobiles, machinery and other fields. The strength and modulus of glass fiber reinforced polypropylene are comparable to engineering plastics, which further expands the application prospects of reinforced polypropylene. However, due to the large shrinkage rate of the polypropylene material itself and the crystalline material, the cooling and solidification speed after injection molding is slow, and there are positions where the thickness changes in the part, and sink marks are prone to appear. This...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08L51/06C08K3/30C08K3/26C08K3/34C08K7/14
Inventor 李聪刘乐文姜向新肖鹏陶四平陈大华叶南飚
Owner KINGFA SCI & TECH CO LTD
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