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Polypropylene resin composite

A technology of polypropylene resin and composition, applied in the field of polypropylene resin composition, can solve the problems of flow marks, prolong the molding cycle, increase the production cost, etc., and achieve the effect of good performance

Inactive Publication Date: 2010-11-17
株洲时代工程塑料制品有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing modified polypropylene is made into auto parts by injection molding, especially in the process of large automotive interior parts such as instrument panels and door panels, due to the different flow properties of polypropylene and fillers, lubricants and other materials, The prepared automotive interior parts have appearance defects such as tiger skin patterns or flow marks, which affect the appearance of the automotive interior parts
[0004] The existing technology generally eliminates tiger stripes or flow marks by modifying the mold or post-processing the automotive interior parts, such as using a metal mold whose temperature can be changed, but this method requires a specific metal mold and will prolong the forming cycle and increase Cost of production
Spraying treatment of automotive interior parts can also cover up tiger skin or flow marks, but the spraying treatment requires polypropylene to have good paint adhesion performance, and it is necessary to modify the surface of non-polar polypropylene, which not only increases the process steps, and the paint will cause environmental pollution and affect human health

Method used

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  • Polypropylene resin composite
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mix 68kg polypropylene, 20kg calcium carbonate, 0.3kg2-tert-butyl-4-methoxyphenol, 0.2kg4-hydroxyl-2,2,6,6-tetramethylpiperidine and 0.3kg calcium stearate Mix in the machine for 2min, the rotating speed of the mixer is 350 rpm; then add 12kgPOE and 0.2kg acrylate-maleic acid-ethylene terpolymer to it and continue mixing for 1.5min, the rotating speed of the mixer is 500 rpm Minutes, then transfer the material to a twin-screw extruder, melt and knead at 200°C, and obtain a polypropylene resin composition after extrusion. Wherein, the MFR of the polypropylene is 10g / 10min, and the Izod notched impact strength is 15kJ / m 2 .

[0048] The polypropylene resin composition was dried at 80°C for 2 hours, and a standard sample was obtained after injection molding by an injection machine. The molding process parameters were as follows:

[0049] Material temperature: 230°C for the first stage, 230°C for the second stage, 230°C for the third stage, 220°C for the fourth stage, and...

Embodiment 2

[0062] 68kg polypropylene, 10kg calcium carbonate, 10kg talcum powder, 0.4kg tris(2-isobutylphenyl) phosphite, 0.2kg2-(2'-hydroxyl-5'-methylphenyl)benzotriazole Mix 2min with 0.3kg titanate in the mixer, the rotating speed of the mixer is 350 rpm; then add 12kgPOE and 0.2kg1,2-epoxy-5-hexene-butadiene copolymer to it and continue mixing 1.5min, the rotational speed of the mixer is 600 rpm, and then the material is transferred to a twin-screw extruder, melted and kneaded at 200°C, and extruded to obtain a polypropylene resin composition. Wherein, the MFR of the polypropylene is 15g / 10min, and the Izod notched impact strength is 20kJ / m 2 .

[0063] The polypropylene resin composition was dried at 80°C for 2 hours, and a standard sample was obtained after injection molding by an injection machine according to the process parameters provided in Example 1. The appearance of the standard sample was observed, and the results are shown in Table 1, Table 1. 1 is the appearance observ...

Embodiment 3

[0066] 61kg polypropylene, 15kg calcium carbonate, 10kg talcum powder, 0.3kg octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.2kg2-(2'-hydroxy -5'-methylphenyl) benzotriazole and 0.3kg aluminate were mixed in a mixer for 2min, and the rotation speed of the mixer was 350 rpm; then 14kgSEBS and 0.2kg acrylate-trans-butene were added thereto The diacid-ethylene terpolymer continued to mix for 1.5min, the speed of the mixer was 600 rpm, and then the material was transferred to a twin-screw extruder, melted and kneaded at 200°C, and a polypropylene resin composition was obtained after extrusion. things. Wherein, the MFR of the polypropylene is 20g / 10min, and the notched Izod impact strength is 18kJ / m 2 .

[0067] The polypropylene resin composition was dried at 80°C for 2 hours, and a standard sample was obtained after injection molding by an injection machine according to the process parameters provided in Example 1. The appearance of the standard sample was observe...

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Abstract

The invention provides a polypropylene resin composite. The composite comprises the following components in part by weight: 30 to 80 parts of polypropylene, 10 to 40 parts of packing, 5 to 20 parts of toughening agent, 0.2 to 1.5 parts of heat stabilizer, 0.01 to 3 parts of appearance improver and 0.2 to 2 parts of lubricant, wherein the appearance improver is an acrylate-carboxyl-containing olefin-propylene terpolymer or an epoxy aliphatic polymer. The appearance improver used in the invention is an aliphatic polymer with polar groups such as an acrylic resin group, a carboxyl, an epoxy group or the like, wherein the polymer per se has high compatibility with the components such as the polypropylene, the toughening agent and the like, while the polar groups have the high compatibility with the components such as the packing, the lubricant and the like; under the effect of the appearance improver, the fluidity and the flow direction of the non-polar substances such as the polypropylene, the toughening agent and the like and the polar substances such as the packing, the lubricant and the like tend to be consistent so as to avoid appearance defects such as a fiddle back figure, a rill mark or the like.

Description

technical field [0001] The invention relates to the technical field of resin compositions, in particular to a polypropylene resin composition. Background technique [0002] Polypropylene is widely used in the automobile manufacturing industry due to its advantages of light weight, corrosion resistance, and large design freedom, especially for the manufacture of automobile bumpers, instrument panels, door panels and other components. [0003] In order to make the obtained automotive products have better performance, modified polypropylene has become one of the research hotspots, such as filled polypropylene with fillers such as calcium carbonate, mica powder, calcium silicate or talcum powder added; rubber latex, Toughened polypropylene with toughening agents such as minerals or whiskers; filled and toughened polypropylene with fillers, toughening agents and other lubricants added at the same time. However, when the existing modified polypropylene is made into auto parts by ...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08L23/12C08L23/08C08L33/08C08L23/20C08K13/02C08K3/26C08K5/13C08K3/34
Inventor 陈如意邓凯桓黎敏李方军
Owner 株洲时代工程塑料制品有限责任公司
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