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Polypropylene expanded material and method for manufacturing same

A foaming material, polypropylene technology, applied in the field of polyolefin foaming materials, can solve the problems of insufficient mechanical properties, long cycle, difficulty in large-scale production, etc., and achieve the effect of good physical and mechanical properties and heat resistance

Inactive Publication Date: 2007-12-05
天津市润生塑胶制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the current polyolefin foam materials are used in the fields of automobiles and construction, they have shortcomings such as insufficient mechanical properties and large dimensional changes after thermoforming.
[0003] Chinese patent CN 1346843A discloses a preparation method of radiation cross-linked polypropylene foam material, but the polypropylene resin used in this patent is a special radiation-resistant polypropylene, and the blending temperature is as high as 160-200 ℃, and the sheet after radiation crosslinking needs to be placed for a period of time before it can be foamed, the cycle is long, and large-scale production is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13

25.8

[0041] Blowing agent A-Azodicarbonamide

[0042] Blowing agent B-5-phenyl tetrazole

[0043] Foaming agent C-p-toluenesulfonyl semicarbazide

[0044] Blowing agent D-N,N'-dimethylenepentamethylenetetramine.

[0045] The method that the embodiment of the present invention adopts is as follows:

[0046] (1) Mix the matrix resin with the chemical foaming agent, auxiliary crosslinking agent and other additives uniformly according to the proportion or first granulate them into masterbatches and then mix them uniformly.

[0047] (2) Melting and blending the mixture in step (1) into a sheet or shaped material. The blending equipment can be an open mill, an internal mixer, a single-screw extruder or a twin-screw extruder, etc. In order to ensure stability in the molding process, the blending molding temperature should be controlled at 110-160°C, preferably 125-150°C.

[0048] (3) Carrying out radiation crosslinking to the molded product of the previous step. ...

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Abstract

The present invention is foamed polypropylene material and its production process. The foamed polypropylene material is produced with polypropylene resin 30-97 wt%, other olefin polymer 0-57 wt%, foaming agent 2-20 wt% and cross-linking assistant 0.1-5 wt%, and through a radiation cross-linking process including smelting the mixture at 110-160 deg.c, blending, shaping and radiation cross-linking in the radiation dose of 5-60 kGy; and a high temperature foaming process of normal pressure foaming at 200-350 deg.c or pressurized foaming at 200-300 deg.c. The present invention has a radiation cross-linking process superior to chemical cross-linking process with likelihood of breaking molecular chain and is suitable for industrial production, and the foamed polypropylene material has high physical and mechanical performance and high heat resistance.

Description

technical field [0001] The invention belongs to polyolefin foam material, and more specifically, it relates to a polypropylene foam material and a manufacturing method thereof. Background technique [0002] Polyolefin foam materials have the characteristics of softness, cushioning, sound and heat insulation, non-toxicity, excellent mechanical properties and post-processing properties, and excellent chemical resistance. Therefore, it is widely used in thermal insulation, sealing and waterproof protection materials in civil construction; interior and exterior trim parts of automobiles and vehicles, such as bumpers, door panels and instrument panels; positioning packaging in the packaging industry, and thermal insulation in the electronic and electrical industry. Thermal materials and packaging protection materials, as well as transportation, daily culture, instrumentation and other fields. However, when the current polyolefin foam materials are used in the fields of automobil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08J9/06C08J3/24
Inventor 万君樊高明王加存孔爱斌刘宏家
Owner 天津市润生塑胶制品有限公司
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