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Preparation method of silicon rubber foam material

A foam material and silicone rubber technology, which is applied in the field of polymer material processing, can solve the problems of inconsistent degree of cross-linking between the surface layer and the interior of the rubber compound, uneven foam density, poor heat transfer, etc., and achieves low compression permanent deformation and small cells. Uniform, smooth surface effect

Inactive Publication Date: 2010-07-21
WUJIANG LANGKE CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In addition, the uniformity of peroxide crosslinking is affected by its dispersion state in silicone rubber. Especially for foamed rubber, the heat transfer is poor, and the internal heating is slower than the surface layer, which often results in the surface and internal crosslinking of the rubber. Inconsistent, non-uniform foam density and thick skin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: 100 grams of dimethyl silicone rubber, 15 grams of fumed silica, and 2 grams of hydroxyl silicone oil were mixed at room temperature for 4 minutes using a double-roller open mill, and 3 grams of azodicarbonamide were added. 1 gram of zinc oxide and 4 grams of triallyl isocyanurate were mixed for 4 minutes, and then compression molded on a flat vulcanizer at room temperature to form a plate. A cylindrical cobalt 60 gamma ray source is used to carry out radiation crosslinking on the silicone rubber compound in air at room temperature, and the radiation dose is 6kGy. The cross-linked silicone rubber is foamed in hot air, the temperature of the hot air is 200° C., and the foaming time is 5 minutes. After the silicone rubber is foamed, the cobalt 60 gamma ray source is used for secondary radiation crosslinking immediately, and the radiation dose is 50kGy.

Embodiment 2

[0031] Example 2: 100 grams of methyl vinyl silicone rubber, 30 grams of fumed silica, and 6 grams of diphenylsilanediol were mixed at room temperature for 7 minutes using an internal mixer, and 8 grams of dinitroso Pentamethylenetetramine, 2 grams of urea, and 2 grams of trimethylolpropane trimethacrylate were kneaded for 5 minutes, and then compression molded on a flat vulcanizing machine at room temperature to form a plate. Using a JJ-2 electrostatic accelerator, the silicone rubber compound is irradiated and cross-linked in air at room temperature, and the irradiation dose is 10kGy. The crosslinked film was foamed in hot air, the temperature of the hot air was 190° C., and the foaming time was 8 minutes. After the silicone rubber is foamed, the JJ-2 type electrostatic accelerator is used for secondary radiation crosslinking immediately, and the radiation dose is 30kGy.

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PUM

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Abstract

The invention discloses a preparation method of a silicon rubber foam material, which is characterized by mixing 100 parts of silicon rubber, 12-85 parts of white carbon black, 2-15 parts of constitution controller, 3-15 parts of foaming agent, 0-5 parts of blowing promoter and 0-8 parts of cross-linking agent promoter and forming, radiating the silicon rubber by electron beams or gamma rays to generate cross-linking reaction, heating the foaming agent for decomposing and foaming, immediately utilizing the electron beams or the gamma rays to carry out secondary radiation crosslinking after foaming the silicon rubber to further improve the comprehensive properties of the silicon rubber foam material. The silicon rubber foam material can be used for sealing, damping, insulation, sound insulation and thermal insulation materials.

Description

technical field [0001] The invention relates to a preparation method of a silicon rubber foam material, which belongs to the field of polymer material processing. Background technique [0002] Silicone rubber foam material is a porous polymer elastic material prepared by foaming silicone rubber. According to the different cell structures, it can be divided into closed-cell, open-cell and mixed-cell silicone rubber foams. According to the book "Organosilicon Materials" written by Professor Zhang Jikai from the School of Materials, Beijing University of Chemical Technology, silicone rubber foam materials can be divided into room temperature vulcanized silicone rubber foams and high temperature vulcanized silicone rubber foams. [0003] Room temperature vulcanized silicone rubber foam usually uses condensation-type hydroxyl-terminated silicone rubber as the base material, hydroxyl silicone oil as the foaming agent, and platinum complex as the catalyst. It can be vulcanized and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08K13/02C08K3/36C08J9/10C08J3/28C08J3/24
Inventor 卢贤生
Owner WUJIANG LANGKE CHEM FIBER
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