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Polypropylene glass fiber material with good appearance and low warpage, and preparation method thereof

A technology of polypropylene and low warpage, applied in the field of polymers, which can solve the problems of high molding shrinkage rate, reduced shrinkage rate, difficulty in consistent distribution of glass fibers, etc., to achieve enhanced interface interaction, good surface and low warpage , Improve the effect of shrinkage uniformity

Inactive Publication Date: 2020-05-15
ORINKO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polypropylene (referred to as PP) material has excellent heat resistance, bending fatigue resistance, low price, and wide application; but PP has low impact toughness, poor creep resistance, high molding shrinkage, and poor dimensional stability; ordinary PP materials require Adding more than 20% glass fiber can effectively reduce the shrinkage rate of the material and improve the dimensional stability of the composite material. However, glass fiber modified PP, due to the relatively large length and diameter of the glass fiber, the molecular chain orientation of the polypropylene base material during product injection molding. The reason is that the internal stress of the orientation is generated; and the shrinkage of the product is not uniform when it is cooled and shaped, and the internal stress of the cooling is generated.
The existence of these internal stresses will seriously affect the flatness of injection molded products, causing warping and deformation of injection molded parts. At the same time, because the distribution tendency of glass fibers is difficult to be consistent, the appearance of the product is seriously floating, which affects the appearance of the product. It can only be used In non-appearance parts, it cannot be applied to appearance parts

Method used

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  • Polypropylene glass fiber material with good appearance and low warpage, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of good appearance and low warpage polypropylene glass fiber material, its raw materials include by weight: 57 parts of polypropylene, 30 parts of glass fiber, 10 parts of compatibilizer, 3 parts of organopolysiloxane surface modifier, antioxidant 0.1 part of dose;

[0033] Wherein, in the preparation process of the organopolysiloxane surface modifier, the pH=7.5-8 of the polysiloxane emulsion with a solid content of 10% is adjusted with a mass fraction of 5% sodium carbonate aqueous solution, and in a nitrogen atmosphere , stirred and heated up to 85°C, added dropwise styrene, swelled for 30 minutes, then added potassium persulfate aqueous solution, kept the reaction for 4 hours, then added dropwise methyl methacrylate, swelled for 30 minutes, then added potassium persulfate aqueous solution, kept the temperature for 4 hours, cooled to room temperature, break the emulsion, take the solid, wash it, and dry it in vacuum for 24 hours to obtain an organopolysiloxane...

Embodiment 2

[0039] A kind of good appearance and low warpage polypropylene glass fiber material, its raw materials include by weight: 50 parts of polypropylene, 30 parts of glass fiber, 15 parts of compatibilizer, 5 parts of organopolysiloxane surface modifier, antioxidant 1 dose;

[0040] Among them, the preparation methods of organopolysiloxane surface modifier, compatibilizer, polypropylene, glass fiber, and the above-mentioned polypropylene glass fiber material with good appearance and low warpage are the same as in Example 1.

Embodiment 3

[0042] A kind of good appearance and low warpage polypropylene glass fiber material, its raw materials include by weight: 44 parts of polypropylene, 30 parts of glass fiber, 20 parts of compatibilizer, 6 parts of organopolysiloxane surface modifier, antioxidant 1.5 parts of agent;

[0043] Among them, the preparation methods of organopolysiloxane surface modifier, compatibilizer, polypropylene, glass fiber, and the above-mentioned polypropylene glass fiber material with good appearance and low warpage are the same as in Example 1.

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Abstract

The invention discloses a polypropylene glass fiber material with good appearance and low warpage. The polypropylene glass fiber material comprises, by weight, 35-70 parts of polypropylene, 20-40 parts of a glass fiber, 10-20 parts of a compatilizer, 3-6 parts of an organopolysiloxane surface modifier and 0.1-2 parts of an auxiliary agent. The invention also discloses a preparation method of the polypropylene glass fiber material with good appearance and low warpage. Through compounding of the compatibilizer, the organopolysiloxane surface modifier, the polypropylene and the glass fiber, on the premise that the rigidity and the strength of the material are not greatly lost, the material has the advantages of being good in appearance and low in warping degree and can be widely applied to appearance part products with high requirements in the fields of automobiles, household appliances and the like.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a polypropylene glass fiber material with good appearance and low warpage and a preparation method thereof. Background technique [0002] Polypropylene (referred to as PP) material has excellent heat resistance, bending fatigue resistance, low price, and wide application; but PP has low impact toughness, poor creep resistance, high molding shrinkage, and poor dimensional stability; ordinary PP materials require Adding more than 20% glass fiber can effectively reduce the shrinkage rate of the material and improve the dimensional stability of the composite material. However, glass fiber modified PP, due to the relatively large length and diameter of the glass fiber, the molecular chain orientation of the polypropylene base material during product injection molding. The reason is that the internal stress of orientation is generated; and the shrinkage of the product is not uniform w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L51/08C08L23/08C08L53/02C08L51/06C08K7/14C08J5/04C08F283/12C08F220/14C08F212/08
CPCC08F283/12C08J5/043C08J2323/12C08J2423/08C08J2451/06C08J2451/08C08J2453/02C08K7/14C08F220/14C08F212/08
Inventor 王刚吴仲涛蒋文远周海
Owner ORINKO NEW MATERIAL CO LTD
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