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Light-coloured high temperature resistant organic silicone adhesive/sealant

A technology of organic silica gel and high temperature resistance, which is applied in the direction of adhesives, other chemical processes, chemical instruments and methods, etc., and can solve problems such as decreased elasticity, decreased manufacturability, unfavorable adhesive/sealant application and construction, etc.

Inactive Publication Date: 2008-11-26
上海橡胶制品研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Fe 2 o 3 There are some defects: firstly, it is a kind of red pigment with strong coloring power, so the obtained product has a single color, which is not conducive to the user's choice of color diversity; in addition, Fe 2 o 3 The ability to consume oxygen (unit mass) is low, and a large amount needs to be added to achieve a certain effect, and the upper limit temperature that can be used is limited to 250°C. Under the condition of higher than 300°C, silicone rubber will still age rapidly
However, this method also has certain limitations. If the amount of phenyl groups introduced is too small, the temperature resistance will not be improved significantly. If too many phenyl groups are introduced, the rigidity of the rubber will increase, and the elasticity will decrease. At the same time, the manufacturability will decrease, the viscosity will increase, and it will be difficult to squeeze. Out, not conducive to the application of adhesive / sealant construction
In addition, the cost of liquid silicone rubber containing phenyl groups is high, which is much higher than that of liquid silicone rubber terminated with functional groups such as hydroxyl groups.
It should also be pointed out that general room temperature vulcanizing silicone adhesives / sealants are cured by absorbing moisture in the air, and the curing cycle is long, usually taking about one week. In this way, it is used in some production lines, and some Difficult, there needs to be a means of accelerating curing

Method used

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  • Light-coloured high temperature resistant organic silicone adhesive/sealant
  • Light-coloured high temperature resistant organic silicone adhesive/sealant
  • Light-coloured high temperature resistant organic silicone adhesive/sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Get 100g of hydroxyl-terminated polydimethylsiloxane with a viscosity of 5,000cp, add 20g of hexamethyldisilazane-treated fumed silica, 0.5g of fumed titanium dioxide, and 100g of Al 2 o 3 , stir evenly in a stirred tank, vacuum dehydrate at 150°C, cool to 60°C, add 7g of methyltrimethoxysilane, stir for 30min, add 1.5g of isopropyl titanate, stir for 50min, and press the rubber mixture Form a test piece of 50mm×50mm×2mm, and measure its mechanical properties at room temperature and high temperature, and the results are shown in Table 2. The adhesive / sealant material skins on the surface within 1 hour at 25°C and loses its viscosity, and the curing depth reaches 3mm in 24 hours: the vulcanization speed can be increased by heating, for example, the curing depth can be achieved after 4 hours at 200°C. up to 3mm.

Embodiment 2

[0038] Get 100g of hydroxyl-terminated polydimethylsiloxane with a viscosity of 5,000cp, add 20g of hexamethyldisilazane-treated fumed silica, 2g of fumed titanium dioxide, and 100g of Al 2 o 3 , stirred evenly in a stirred tank, vacuum dehydrated at 150°C, cooled to 60°C, added 7g of phenyltrimethoxysilane, stirred for 30min, added 1.5g of isopropyl titanate, stirred for 50min, and pressed the rubber mixture Form a test piece of 50mm×50mm×2mm, and measure its mechanical properties at room temperature and high temperature, and the results are shown in Table 2. The adhesive / sealant material skins on the surface within 1 hour at 25°C, loses its viscosity, and the curing depth reaches 3mm in 24 hours; the vulcanization speed can be increased by heating, such as heating at 200°C for 4 hours, the curing depth can reach 3mm .

Embodiment 3

[0040] Get 100g of hydroxyl-terminated polydimethylsiloxane with a viscosity of 7,000cp, add 20g of hexamethyldisilazane-treated fumed white carbon black, 1.5g of fumed titanium dioxide, 60gAl 2 o 3 , stirred evenly in a stirred tank, vacuum dehydrated at 150°C, cooled to 60°C, added 7g of phenyltrimethoxysilane, stirred for 30min, added 1.5g of isopropyl titanate, stirred for 50min, and pressed the rubber mixture Form a test piece of 50mm×50mm×2mm, and measure its mechanical properties at room temperature and high temperature, and the results are shown in Table 2. The adhesive / sealant material skins on the surface within 1 hour at 25°C, loses its viscosity, and the curing depth reaches 3mm in 24 hours; the vulcanization speed can be increased by heating, such as heating at 200°C for 4 hours, the curing depth can reach 3mm.

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PUM

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Abstract

The invention relates to a tint high-temperature resistant organic silicon adhesive / sealant, which takes the polysiloxane with the end capped by active functional groups as the foundation, the white carbon soot with the surface going through hydrophobic treatment as reinforcing stuffing, the vapor phase titanium dioxide as a free oxygen consumption agent and the silane coupling agent containing phenyl as a cross linker and combines with proper heat conducting stuffing and catalyst. The silicon adhesive / agent can be solidified at room temperature or rapidly solidified through heating. The product is French grey paste, which allows diversified color matching. The solidified product of the silicon adhesive / agent can endure the temperature as high as 300 DEG C.

Description

technical field [0001] The present invention relates to the adhesive / sealant industry in the field of chemical industry, in particular to a light-colored composition based on silicone materials that is pasty before curing, which can be used as both an adhesive and a Sealant, its cured product can withstand high temperature of 300°C. Background technique [0002] The room temperature vulcanization (RTV) adhesive / sealant based on low molecular weight polysiloxane terminated by active functional groups is a material that combines the properties of organic materials and inorganic materials, and has excellent comprehensive physical and chemical properties, especially its The stability at high temperature makes it widely used in many sectors of the national economy. At present, room temperature vulcanized silicone adhesives / sealants usually use hydroxyl-terminated polydimethylsiloxane as the main material, and are exposed at room temperature under the combined action of added rei...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09K3/10C08K5/57
Inventor 汪钧
Owner 上海橡胶制品研究所有限公司
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