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Polyethylene/rubber expansion rubber brick for automobile and preparation method thereof

A technology of rubber expansion and polyethylene, which is applied in the field of expansion rubber blocks, can solve the problems of poor performance such as shock absorption, sound insulation and flame retardancy, complex preparation process of expansion rubber blocks, and discounted product performance, so as to achieve uniform product structure and low cost. Low, good filling and sealing performance

Inactive Publication Date: 2012-04-18
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation process of the expansion rubber block with the above-mentioned layered structure is complicated and the cost is high, and due to the different thermal expansion coefficients between the layers of the expansion rubber block, they will be mutually restricted during the thermal expansion process, which will not only affect the expansion rate, but also may cause interlayer Peel off each other, so that the holes in the body sheet metal or the cavity formed between the sheet metals cannot be fully filled, resulting in poor fit and sealing, resulting in poor performance such as shock absorption, sound insulation, and flame retardancy, which greatly reduces product performance.

Method used

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  • Polyethylene/rubber expansion rubber brick for automobile and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Internal mixing: In terms of parts by weight, first add 60 parts of low-density polyethylene, 40 parts of medium-density polyethylene, and 20 parts of natural rubber into the internal mixer, mix at 120°C for 10 minutes, and then Add 15 parts of 4,4'-oxobisbenzenesulfonyl hydrazide, 5 parts of polyethylene wax, 1.5 parts of zinc stearate, 1 part of dicumyl peroxide, 0.2 parts of sulfur, triallyl 3 parts of isocyanurate, 1.5 parts of tetramethylthiuram disulfide, 0.5 parts of zinc ethylbenzene dithiocarbamate, 1.5 parts of trimethylolpropane triacrylate, 10 parts of liquid polyisobutylene, trioxide 20 parts of diantimony and 10 parts of decabromodiphenylethane were mixed for another 5 minutes at a temperature of 110° C. to form a uniform mixture.

[0023] (2) Milling: Add the above-mentioned homogeneous mixture into a two-roller kneader, pass it thinly for 5 times at a temperature of 120°C, and produce tablets, then pulverize and granulate into pellets with a pulveriz...

Embodiment 2

[0027] (1) Internal mixing: In terms of parts by weight, first add 80 parts of low-density polyethylene, 20 parts of medium-density polyethylene, and 15 parts of ethylene-propylene rubber into the internal mixer, and mix for 15 minutes at a temperature of 135°C. Then add 10 parts of azodicarbonamide, 10 parts of azobisisobutyronitrile, 4 parts of foaming aid AG-210, 1.5 parts of calcium silicate, 1 part of tert-butyl dicumyl peroxide, and 0.3 parts of sulfur 1 part, 3 parts of triallyl isocyanurate, 1.2 parts of tetramethylthiuram disulfide, 1 part of 2-mercaptobenzothiazole, 1 part of trimethylolpropane triacrylate, rosin pentaerythritol ester 10 parts, 20 parts of antimony trioxide, 10 parts of aluminum hydroxide, and mixed at 125 ° C for 8 minutes to form a uniform mixture.

[0028] (2) Kneading: Add the above-mentioned homogeneous mixture into a two-roller kneader, pass it thinly for 8 times at a temperature of 135°C, and then produce tablets, then pulverize and granulate ...

Embodiment 3

[0032] (1) Internal mixing: in parts by weight, first add 90 parts of low-density polyethylene, 10 parts of medium-density polyethylene, and 25 parts of styrene-butadiene rubber into the internal mixer, and mix for 20 minutes at a temperature of 110°C. Then add 20 parts of N,N-dinitrosopentamethylenetetramine, 5 parts of ammonium bicarbonate, 4 parts of white oil, 1 part of urea, 2,5-dimethyl-2,5-bis(tert 1.5 parts of butyl peroxy) hexane, 0.4 parts of sulfur, 3 parts of triallyl isocyanurate, 1.2 parts of tetramethylthiuram disulfide, 0.8 parts of dithiodimorpholine, trimethylol 1 part of propane triacrylate, 20 parts of C5 petroleum resin, 20 parts of antimony trioxide, 5 parts of magnesium hydroxide, and 10 parts of chlorinated paraffin, and mixed at 105°C for 20 minutes to form a uniform mixture.

[0033] (2) Kneading: Add the above mixture into a two-roller kneader, pass it thinly for 12 times at a temperature of 115°C, and produce tablets, then pulverize and granulate. ...

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Abstract

The invention discloses a polyethylene / rubber expansion rubber brick for an automobile and a preparation method thereof. The expansion rubber brick is prepared by using polyethylene and rubber as raw materials, then adding foaming agent, foaming promoter, cross linking agent, cross linking assistant, tackifying resin and fire retardant, and performing the processes of mixing, milling, prilling and extrusion molding to prepare the high performance expansion rubber brick which integrates the functions of foaming expansion, bonding, fire retardant and the like and is provided with even texture. The preparation method provided by the invention has the advantages ofsimple process and low preparation cost; and the product has the advantages of high bulk expansion ratio, excellent filling and sealing properties, fire resistance, good bonding performance to the steel plate, even structure, stable performance and pollution-free preparation process.

Description

technical field [0001] The invention relates to an expansion rubber block, in particular to a polyethylene / rubber expansion rubber block for automobiles and a preparation method thereof. Background technique [0002] At present, the expansion rubber block for automobiles adopts a multi-layer composite structure, which is mainly composed of an inner adhesive layer, an intermediate expansion layer and an outer flame-retardant layer. Before the automobile welding process, the above-mentioned expansion rubber block is fixed in the hole on the automobile body sheet metal or in the cavity formed between the sheet metal. When the expansion rubber block passes through the specific temperature of the baking process, the volume of the expansion rubber block will increase. Expansion can seal the holes in the sheet metal of the body or the cavity formed between the sheet metals, and can block the transmission of water, smoke and air noise. It also has the functions of heat preservation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L9/06C08L23/22C08L23/16C08L7/00C08K13/02C08J9/10C08J9/08B29C47/92B29C48/92
CPCB29C48/0022B29C48/08B29C48/92B29C2948/92647B29C2948/92704B29C2948/92895B29C2948/92904
Inventor 赵雄燕马劲松张仕彪耿耀宗刘德居
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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