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Single-component addition type liquid silicone rubber

A liquid silicone rubber, addition-type technology, applied in the field of liquid silicone rubber, can solve the problems of wrinkling on the surface of sulfide and deterioration of storage performance, achieve high-efficiency inhibition effect, improve storage stability and smoothness of vulcanized surface

Pending Publication Date: 2022-05-06
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, acetylenic alcohols, amines and other volatile substances are mainly used as inhibitors, and the volatilization of the inhibitors often causes problems such as poor storage performance and wrinkling of the sulfide surface during storage and heating vulcanization.

Method used

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  • Single-component addition type liquid silicone rubber
  • Single-component addition type liquid silicone rubber
  • Single-component addition type liquid silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A one-component addition type liquid silicone rubber, according to parts by weight, includes the following components:

[0025]

[0026]

[0027] Low viscosity vinyl silicone oil has a viscosity of 200mPa.s, and high viscosity vinyl silicone oil has a viscosity of 7500mPa.s.

[0028] The phosphite is triphenyl phosphite.

[0029] Described peroxide is a kind of in double two four, two two five, hydroperoxide, is double two four in the present embodiment.

[0030] The mass fraction of hydrogen in the hydrogen-containing silicone oil is 0.1%.

[0031] The liquid silicone rubber of the above components is heated and fully cured at 120°C for 20 minutes, and heated at 150°C for 6 minutes. After curing, the surface is smooth, and the measured bonding strength with the substrate aluminum is 1.60 MPa; the storage time and viscosity changes at room temperature are shown in Table 1.

Embodiment 2

[0033] A one-component addition type liquid silicone rubber, according to parts by weight, includes the following components:

[0034]

[0035] The low-viscosity vinyl silicone oil has a viscosity of 500 mPa.s, and the high-viscosity vinyl silicone oil has a viscosity of 10000 mPa.s.

[0036] The phosphite is triphenyl phosphite.

[0037] The peroxide is bis-2-5.

[0038] The filler is alumina.

[0039] The mass fraction of hydrogen in the hydrogen-containing silicone oil is 0.4%.

[0040] The liquid silicone rubber of the above components is heated and fully cured at 120°C for 55 minutes, and heated at 150°C for 13 minutes. After curing, the surface is smooth, the measured bonding strength with the substrate aluminum is 2.03MPa, and the thermal conductivity is 0.9W / (K.m). The storage time and viscosity changes at room temperature are shown in Table 1.

Embodiment 3

[0042] A one-component addition type liquid silicone rubber, according to parts by weight, includes the following components:

[0043]

[0044] The low-viscosity vinyl silicone oil has a viscosity of 750 mPa.s, and the high-viscosity vinyl silicone oil has a viscosity of 20000 mPa.s.

[0045] The phosphite is triphenyl phosphite.

[0046] The peroxide is bis-diquat.

[0047] The fillers are aluminum nitride and boron nitride.

[0048] The mass fraction of hydrogen in the hydrogen-containing silicone oil is 0.6%.

[0049] The liquid silicone rubber of the above components is heated at 120°C for 15 minutes, and at 150°C for 5 minutes. After curing, the surface is smooth, the measured bonding strength with the substrate aluminum is 2.40MPa, and the thermal conductivity is 3.0W / (K.m). The storage time and viscosity changes at room temperature are shown in Table 1.

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Abstract

The invention discloses single-component addition type liquid silicone rubber, which is prepared from the following components in parts by weight: 25 to 55 parts of low-viscosity vinyl silicone oil, 15 to 35 parts of high-viscosity vinyl silicone oil, 15 to 45 parts of fumed silica, 3 to 6 parts of silazane, 0 to 500 parts of filler, 1.5 to 2 parts of water, 2 to 10 parts of hydrogen-containing silicone oil, 0.2 to 0.5 part of isopropyl alcohol solution containing 0.5 percent of chloroplatinic acid and 0.002 to 0.005 part of phosphite ester. And 0.01 to 1 part of peroxide. An inhibitor system is composed of phosphite ester with an efficient inhibition effect and low volatility and peroxide, the phosphite ester has a good inhibition effect on the platinum catalyst at low temperature, and after the temperature rises, the peroxide is heated to decompose and oxidize the phosphite ester, so that the phosphite ester loses the inhibition effect, the catalytic ability of the platinum catalyst is recovered, and the catalytic activity of the platinum catalyst is improved. Therefore, the purpose of improving the storage stability of the sizing material and the smoothness of the vulcanized surface is achieved.

Description

technical field [0001] The invention relates to the technical field of liquid silicone rubber, in particular to a single-component addition type liquid silicone rubber. Background technique [0002] Most of the currently commercially available addition-type silicone rubbers are two-component, and the two components need to be mixed evenly before use. The rubber material after mixing has a short service life, and equipment and instruments need to be cleaned after use. One-component addition-type silicone rubber has the advantages of convenient storage and transportation, and convenient use. It not only avoids the trouble caused by two-component mixing operations, but also has stable viscosity and easy control of curing. It is suitable for various high-temperature rapid coating processes. , showing more advantages than two-component. The key problem is to solve the storage stability of the rubber at room temperature. At present, the method to solve the storage stability at ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K7/26C08K5/526C08K5/14
CPCC08L83/04C08L2205/025C08K7/26C08K5/526C08K5/14
Inventor 刘建桥辛振祥卢娜王洪振
Owner QINGDAO UNIV OF SCI & TECH
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