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Polypropylene composition with good dimensional stability and preparation method and application thereof

A technology of polypropylene composition and dimensional stability, which is applied in the field of modified plastics, can solve the problems of large differences in linear expansion coefficients, etc., and achieve the effect of improving dimensional stability and improving dimensional stability

Active Publication Date: 2013-01-16
TIANJIN KINGFA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem that the linear expansion coefficient of the existing modified polypropylene material is very different in the melt flow direction (FD) and the vertical flow direction (MD), the primary purpose of the present invention is a kind of linear expansion coefficient in the FD and MD Polypropylene composition with small linear expansion coefficient difference and good dimensional stability

Method used

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  • Polypropylene composition with good dimensional stability and preparation method and application thereof
  • Polypropylene composition with good dimensional stability and preparation method and application thereof

Examples

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Embodiment 1

[0031] A polypropylene composition with good dimensional stability, its raw material formulation is shown in Table 1, and its preparation method comprises the following steps:

[0032] Adding polypropylene, elastomer, mineral filler, inorganic filler, nucleating agent and other additives into a twin-screw extruder, performing melt blending, extruding and granulating to obtain the polypropylene composition with good dimensional stability ; The aspect ratio of the twin-screw extruder is (32-48):1, and the processing temperature of the twin-screw extruder is 180-250°C.

[0033] The polypropylene used is high crystalline polypropylene with an isotacticity ≥ 99%, crystallinity ≥ 70%, and a melt flow rate of 3-70g / 10min under the conditions of 230°C and 2.16kg.

[0034] The elastomer used is an ethylene-propylene-diene copolymer.

[0035] The nucleating agent used was sodium 2,2'-methylene-bis(4,6-di-tert-butylphenoxy)phosphate.

[0036] The mineral filler used is ultra-fine high-...

Embodiment 2

[0040] A polypropylene composition with good dimensional stability, its raw material formula is shown in Table 1, and its preparation method is the same as in Example 1.

[0041] Used polypropylene, mineral filler, inorganic filler, other additives are all with embodiment 1.

[0042] The elastomer used is an ethylene-butene copolymer.

[0043] The nucleating agent used was sodium bis(4-tert-butyl-phenoxy)phosphate.

Embodiment 3

[0045] A polypropylene composition with good dimensional stability, its raw material formula is shown in Table 1, and its preparation method is the same as in Example 1.

[0046] Used polypropylene, mineral filler, inorganic filler, other additives are all with embodiment 1.

[0047] The elastomers used are ethylene-propylene-diene copolymers and ethylene-octene copolymers.

[0048] The nucleating agents used were 2,2'-methylene-bis(4,6-di-tert-butylphenoxy)sodium phosphate and bis[2,2'-methylene-bis(4,6-bis tert-butylphenoxy) hydroxyaluminum phosphate].

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Abstract

The invention discloses a polypropylene composition with a good dimensional stability and a preparation method and an application thereof. The polypropylene composition comprises 40% to 90% of polypropylene, 3% to 25% of elastomer, 0.2% to 2% of nucleating agents, 5% to 30% of mineral fillers and 1% to 5% of inorganic fillers, the nucleating agents are alpha-nucleating agents, the mineral fillers are superfine high silicon talcum powders, and the inorganic fillers are alkali-free boron-free silicate inorganic glass fibers. By means of the efficient nucleating agents and the superfine high silicon talcum powder fillers, after a workpiece is formed by injection moulding of the polypropylene composition, the polypropylene material is fully crystallized, so that the linear expansion coefficient of the polypropylene composition can be effectively reduced, and the dimensional stability is improved. By means of the inorganic fillers, the mechanical property of the material can not be reduced, simultaneously the subsequent crystallization of the polypropylene material can be controlled, and the dimensional stability of the polypropylene composition under the condition of long-time cold and heat cycling can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of modified plastics, in particular to a modified polypropylene composition, in particular to a polypropylene composition with good dimensional stability, its preparation method and application. Background technique [0002] Polypropylene plastic has the characteristics of abundant raw materials, cheap price, easy processing, and excellent comprehensive performance. It has become the largest and fastest-growing variety of automotive plastics. However, polypropylene has a large shrinkage rate, poor dimensional stability, and easy warping and deformation, which limit its further application in automobiles. Therefore, polypropylene for automobiles is generally modified. The usual method is to add Mineral fillers and elastomers. Mineral fillers include talc, wollastonite, calcium carbonate, mica, barium sulfate, and the like. The modified polypropylene material has reduced molding shrinkage, which can meet the needs of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16C08L23/08C08K13/04C08K3/34C08K7/14C08K5/527C08K5/523
Inventor 张春怀李欣李晟丁超罗忠富陶四平
Owner TIANJIN KINGFA NEW MATERIAL
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