Modified polypropylene material with low molding shrinkage and without buckling deformation and preparation method of modified polypropylene material

A technology of polypropylene material and shrinkage rate, which is applied in the field of modified polypropylene material and its preparation, can solve the problems of small value difference and small shrinkage rate, and achieve the effect of toughness balance, excellent rigidity, and no floating fiber

Inactive Publication Date: 2013-10-02
GUANGDONG TIANBAO NEW MATERIALS CO LTD
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AI Technical Summary

Problems solved by technology

[0005] At present, there is no modified polypropylene material that can ensure that the shrinkage rate in the horizontal direction and the vertical direction are small at the same time, and the difference between the two values ​​​​is small (less than 0.1%)

Method used

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  • Modified polypropylene material with low molding shrinkage and without buckling deformation and preparation method of modified polypropylene material

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with specific examples. The test methods used in the following examples are conventional methods unless otherwise specified; the raw materials and reagents used, if not otherwise specified, are commercially available raw materials and reagents such as commercially available.

[0030] In the embodiment, the relative density of the polypropylene used is 0.9~0.93g / cm 3 , the melt flow rate is 15~25 g / 10min (190°C, 2.16kg), the horizontal shrinkage rate is 1.3%~1.7%, and the vertical shrinkage rate is 1.4%~1.8%. You can choose PP548RQ produced by Yanshan Petrochemical, which is relatively The density is 0.91g / cm 3 , the melt flow rate is 23 g / 10min (190°C, 2.16kg), and the vertical and horizontal shrinkage rates are 1.46% and 1.50% respectively;

[0031] The filler is a composition of hydrated magnesium silicate and light calcium carbonate;

[0032] Hydrated magnesium silicate, relative densit...

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Abstract

The invention discloses a modified polypropylene material and a preparation method thereof. The modified polypropylene material comprises the following ingredients by mass percentage: 50-55% of polypropylene, 25-30% of filler, 5-10% of glass fiber, 3-8% of shrinkage regulator, 3-8% of elastomer, 0.5-1% of coupling agent, 0.4-1% of dispersing agent, and 0.2-0.5% of antioxidant. The preparation method comprises the steps of mixing weighed PP (polypropylene) resin and the coupling agent in a high speed mixer, adding the other ingredients than the glass fiber for mixing for 5-10min, fusing, mixing, extruding, cooling, drying, pelleting and packaging the mixed material and the glass fiber, and obtaining the modified polypropylene material. According to the polypropylene material and the preparation method, horizontal and vertical flow shrinkages of polypropylene are reduced to below 0.8%, the difference between the shrinkages is very small (below 0.1%), the polypropylene material has excellent processability and rigidity and balanced toughness, a product made of modified polypropylene is free from warpage, no fiber exists on the surface of the product, and the application field of the polypropylene material is expanded greatly.

Description

technical field [0001] The invention relates to a modified polypropylene material with low molding shrinkage and no warping and deformation and a preparation method thereof. Background technique [0002] Polypropylene material is a polymer material with regular structure and high crystallinity. It has low density, good mechanical properties, good heat resistance, stable chemical properties and good processing and forming properties. Therefore, it is widely used in automobiles, home appliances, and construction And the field of daily life has been widely used. However, since polypropylene is a crystalline material, its molding shrinkage rate is relatively large (1.5%~2.5%). Its application is limited in some precision parts that require low shrinkage of the material and no defects in the appearance of the molding. The shrinkage rate of polypropylene can be reduced by glass fiber and mineral filling modified polypropylene material. However, usually due to the anisotropy of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08K13/04C08K7/14C08K3/34C08K3/26
Inventor 张金柱
Owner GUANGDONG TIANBAO NEW MATERIALS CO LTD
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