Low-warpage polypropylene composite and preparation method thereof

A composite material, polypropylene technology, applied in the field of plastics, can solve the problems of reduced production efficiency and processing performance, warpage and deformation, poor surface properties, etc., to improve warpage, improve the difference in shrinkage, and improve crystallinity Effect

Inactive Publication Date: 2019-02-19
安庆市泽烨新材料技术推广服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But usually as the amount of glass fiber filled in polypropylene resin increases, the high degree of orientation makes a big difference between the shrinkage rate of the molded product in the flow direction and perpendicular to the flow direction, so that it causes warping of the final product, It is difficult to be used in rotating parts that require high dimensional stability, such as fans, inner barrels,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A low warpage polypropylene composite material, calculated in parts by weight, includes the following components:

[0022] 61 parts of polypropylene copolymer, 13 parts of continuous glass fiber, 12 parts of EPDM rubber, 25 parts of organically coated modified silicon carbide powder, 10 parts of four-needle nano-zinc oxide whisker, 3 parts of dimethyl itaconate , 2 parts of isopropyl tris(dioctyl phosphate acyloxy) titanate, 9 parts of ethylene-octene copolymer, 0.9 parts of subphenolic heat stabilizer, tetrakis[β-(3,5-di-tert-butyl 0.5 part of pentaerythritol ester and 0.9 part of zinc stearate. The organic-coated modified silicon carbide powder is obtained by first treating silicon carbide with a silane coupling agent and then grafting acrylamide on the surface.

[0023] Preparation:

[0024] Copolymerized polypropylene, continuous glass fiber, EPDM rubber accounting for 36% of the total mass, isopropyl tris(dioctyl phosphate acyloxy) titanate, ethylene-octene copol...

Embodiment 2

[0026] A low warpage polypropylene composite material, calculated in parts by weight, includes the following components:

[0027] 55 parts of polypropylene copolymer, 10 parts of continuous glass fiber, 15 parts of EPDM rubber, 20 parts of organically coated modified silicon carbide powder, 12 parts of tetraacicular nano-zinc oxide whiskers, 2 parts of dimethyl itaconate , 1 part of isopropyl tris (dioctyl phosphate acyloxy) titanate, 6 parts of ethylene-octene copolymer, 0.5 part of subphenolic heat stabilizer, tris (2,4-di-tert-butyl phosphite) 0.2 part of phenyl) ester and 0.6 part of zinc stearate. The organic-coated modified silicon carbide powder is obtained by first treating silicon carbide with a silane coupling agent and then grafting acrylamide on the surface.

[0028] Preparation:

[0029] Copolymerized polypropylene, continuous glass fiber, EPDM rubber accounting for 30% of the total mass, isopropyl tris(dioctyl phosphate acyloxy) titanate, ethylene-octene copoly...

Embodiment 3

[0031] A low warpage polypropylene composite material, calculated in parts by weight, includes the following components:

[0032] 65 parts of homopolypropylene, 15 parts of continuous glass fiber, 10 parts of EPDM rubber, 30 parts of organically coated modified silicon carbide powder, 8 parts of tetraacicular nano-zinc oxide whiskers, 4 parts of dimethyl itaconate 3 parts, 3 parts of isopropyl titanate triisostearate, 12 parts of ethylene-propylene-diene copolymer, 1.2 parts of phosphite heat stabilizer, tetrakis[β-(3,5-di-tert-butyl- 0.8 parts of 4-hydroxyphenyl)propionic acid] pentaerythritol ester and 1.8 parts of polypropylene wax. The organic-coated modified silicon carbide powder is obtained by first treating silicon carbide with a silane coupling agent and then grafting acrylamide on the surface.

[0033] Preparation:

[0034] Homopolypropylene, continuous glass fiber, EPDM rubber accounting for 40% of the total mass, isopropyl triisostearate titanate, ethylene-propyl...

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PUM

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Abstract

The invention provides a low-warpage polypropylene composite and a preparation method thereof. The low-warpage polypropylene composite comprises 60-70 parts of polypropylene resin, 10-15 parts of continuous glass fibers, 10-15 parts of ethylene propylene diene monomers, 20-30 parts of organic coated modified silicon carbide powder, 8-12 parts of tetrapod-like nano-zinc oxide whiskers, 2-4 parts ofdibutyl itaconate, 1-3 parts of titanate coupling agent, 6-12 parts of toughening agent, 0.5-1.2 parts of heat stabilizer, 0.2-0.8 part of antioxygen and 0.6-1.8 parts of lubricant. The preparation method includes: adding the polypropylene resin, the continuous glass fibers, 30-40% by mass of the whole ethylene propylene diene monomers, the titanate coupling agent, the toughening agent, the heatstabilizer, the antioxygen and the lubricant into a double-screw extruder through a main feeding port, adding the other ingredients into the double-screw extruder through a side feeding port, and melting and extruding to pellet at a temperature of 200-240 DEG C. The low-warpage composite has the advantages of good low warpage and good friction resistance.

Description

technical field [0001] The invention belongs to the technical field of plastics, and in particular relates to a low warpage polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene, as a general-purpose plastic, has entered every corner of daily life. Polypropylene modified with mineral powder has been widely used in household appliances due to its good rigidity, low shrinkage and deformation. The currently used method is to add elastomer materials to the polypropylene matrix to improve the impact strength, and to improve the tensile strength, bending strength and bending modulus by introducing 10-40% talcum powder, mica powder, wollastonite, kaolin and other fillers. The amount of scratch resistance is improved by introducing scratch resistance agents such as silicone masterbatches and amide-containing resins. [0003] Polypropylene is one of the five general-purpose plastics. It has excellent performance and has been w...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08L23/12C08L23/16C08L23/08C08K13/06C08K9/10C08K3/34C08K7/14C08K7/08C08K5/11
CPCC08K2201/011C08L23/12C08L23/14C08L2205/03C08L23/16C08L23/0815C08K13/06C08K9/10C08K3/34C08K7/14C08K7/08C08K5/11
Inventor 汪琦
Owner 安庆市泽烨新材料技术推广服务有限公司
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