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High-tear-resistance white carbon black/methyl vinyl silicone rubber composite material and preparation method thereof

A technology of methyl vinyl silicon and composite materials, which is applied in the field of polymer nanocomposites and can solve problems such as complex structures

Active Publication Date: 2021-10-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve higher tear strength silicone rubber by similar methods. However, in the fields of electronics, aviation, food, and hygiene, a large number of silicone rubber products are small parts with complex structures, which require high tear resistance.

Method used

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  • High-tear-resistance white carbon black/methyl vinyl silicone rubber composite material and preparation method thereof
  • High-tear-resistance white carbon black/methyl vinyl silicone rubber composite material and preparation method thereof
  • High-tear-resistance white carbon black/methyl vinyl silicone rubber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) In parts by weight, get 97.5 parts of methyl vinyl silicone rubber 110-2, 2.5 parts of epoxidized silicone rubber with an epoxy content of 15%, 40 parts of fumed white carbon black, vulcanizing agent (double two five) 0.1 copies;

[0035] (2) The roll temperature of the double-roll mill is room temperature. After the methyl vinyl silicone rubber 110-2 is pressed into thin sheets by the mill at room temperature, the vulcanizing agent and white carbon black are added in batches, and the mixture is uniform for 30 minutes. ;

[0036] (3) Add epoxy silicone rubber, and the mixing time is 30min;

[0037] (4) After being parked at room temperature for 24 hours, it was re-milled for 20 minutes, and vulcanized by a flat vulcanizer at 170°C for 10 minutes to prepare a vulcanized silicone rubber composite material.

Embodiment 2

[0039] (1): In parts by weight, get 97.5 parts of methyl vinyl silicone rubber 110-2, 2.5 parts of epoxidized silicone rubber with an epoxy content of 20%, 40 parts of fumed white carbon black, vulcanizing agent (double two five )0.1 part;

[0040] (2) The roll temperature of the double-roll mill is room temperature. After the methyl vinyl silicone rubber 110-2 is pressed into thin sheets by the mill at room temperature, the vulcanizing agent and white carbon black are added in batches, and the mixture is uniform for 30 minutes. ;

[0041] (3) Add epoxy silicone rubber, and the mixing time is 30min;

[0042] (4) After being parked at room temperature for 24 hours, it was re-milled for 20 minutes, and vulcanized by a flat vulcanizer at 170°C for 10 minutes to prepare vulcanized silicone rubber composites.

Embodiment 3

[0044] (1): In parts by weight, get 95 parts of methyl vinyl silicone rubber 110-2, 5 parts of epoxidized silicone rubber with an epoxy content of 10%, 40 parts of fumed white carbon black, vulcanizing agent (double two five )0.1 part;

[0045] (2) The roll temperature of the double-roll mill is room temperature. After the methyl vinyl silicone rubber 110-2 is pressed into thin sheets by the mill at room temperature, the vulcanizing agent and white carbon black are added in batches, and the mixture is uniform for 30 minutes. ;

[0046] (3) Add epoxidized silicone rubber, and the mixing time is 30 minutes.

[0047] (4) After being parked at room temperature for 24 hours, it was re-milled for 20 minutes, and vulcanized by a flat vulcanizer at 170°C for 10 minutes to prepare vulcanized silicone rubber composites.

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Abstract

The invention discloses a high-tear-resistance white carbon black / methyl vinyl silicone rubber composite material and a preparation method thereof. The high-tear-resistance silicone rubber composite material is prepared from the following components in parts by weight: 100 parts of methyl vinyl silicone rubber and epoxidized silicone rubber (80-99.9 parts of methyl vinyl silicone rubber and 0.1-20 parts of epoxidized silicone rubber), 30-50 parts of white carbon black and 0.05-3 parts of a vulcanizing agent. According to the epoxy silicone rubber, epoxy groups can react with hydroxyl groups on the surface of the white carbon black to inhibit structuralization of the white carbon black and improve dispersity, meanwhile, the epoxy silicone rubber can participate in cross-linking of the methyl vinyl silicone rubber to form a giant rigid cross-linked structure with the white carbon black as the center, stress is diffused through cross-linking points of the white carbon black when the material is subjected to stress, so that the composite material has high tear strength. The tensile strength of the prepared silicone rubber composite material can reach 10 MPa, the elongation at break can reach 600%, and the tear strength can reach 60 kN / m.

Description

technical field [0001] The invention relates to the field of polymer nanocomposite materials, in particular to a high tear-resistant white carbon black / methyl vinyl silicone rubber composite material and a preparation method thereof. Background technique [0002] The silicone rubber molecule has a main chain with a silicon-oxygen bond as the repeating unit, and two groups are connected to the silicon atom. Ordinary silica gel mainly has methyl groups and other groups. Due to the certain characteristics of the bond length and bond energy of the silicon-oxygen bond, the silicone rubber molecular chain interaction is small, it has good flexibility and thermal stability, and has good high and low temperature resistance. The Si-O bond distance is 1.64A, which is shorter than the sum of the covalent radii (1.76A), implying that the Si-O bond has the characteristics of a partial double bond. In fact, siloxanes are less basic than ethers. However, both the barrier for rotation ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08K13/02C08K3/36C08K5/14
CPCC08L83/04C08L2205/02C08L83/06C08K13/02C08K3/36C08K5/14
Inventor 卢咏来张立群乔治刚赵秀英
Owner BEIJING UNIV OF CHEM TECH
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