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Two-component room temperature vulcanized fluorosilicone sealant and preparation method thereof

A room temperature vulcanization, two-component technology, used in adhesives, adhesive additives, non-polymer adhesive additives, etc. Long time, difficult to control the surface drying time of fluorosilicone sealant, etc., to achieve the effect of reducing material cost, fast curing, and simple and easy preparation method

Pending Publication Date: 2019-05-21
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Domestic research on fluorosilicone rubber sealants is less, and fluorosilicone sealants have shortcomings such as difficult control of surface dry time, poor high and low temperature resistance, etc.
Guo Linlin from Beijing University of Chemical Technology studied the effect of vulcanization type on the performance of RTV-2 fluorosilicone sealant, and found that the surface drying time of condensation type fluorosilicone sealant is longer
Patent CN102850807 introduces a method of one-component room temperature vulcanization of fluorosilicone rubber, but the mechanical properties of this one-component sealant are not good, the storage period is limited, and there is a problem of slow curing

Method used

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  • Two-component room temperature vulcanized fluorosilicone sealant and preparation method thereof
  • Two-component room temperature vulcanized fluorosilicone sealant and preparation method thereof
  • Two-component room temperature vulcanized fluorosilicone sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 1 part of tetramethyldivinyldisilazane and 1 part of KH550 to 100 parts of fumed silica, stir and react in a planetary mixer at 95°C for 2h, then take it out and dehydrate at 105°C for 2h, and dry it for later use.

[0032] Add 100 parts of hydroxyl-terminated liquid fluorosilicone rubber into the high-speed disperser, then add 20 parts of treated fumed silica, mix well, add 20 parts of precipitated calcium carbonate, and then add 0.5 parts of platinum and silane complexes , 8 parts of methyl fluorosilicone oil, stirred for 20 minutes, after rough mixing, mixed three times with a three-roller mill, then added to a planetary mixer, and vacuumed at 60°C until the mixture was uniform and free of bubbles, and discharged after 30 minutes, to obtain Component A, kept sealed under nitrogen gas for later use.

[0033] Add 100 parts of vinyl-terminated liquid fluorosilicone rubber into the high-speed disperser, then add 20 parts of treated fumed silica, mix well, add 10 part...

Embodiment 2

[0036] Add 1 part of tetramethyldihexenyldisilazane and 2 parts of KH550 to 100 parts of diatomaceous earth, stir and react in a planetary mixer at 125°C for 3 hours, then take it out and dehydrate at 105°C for 3 hours, and dry it for later use.

[0037] Add 100 parts of hydroxyl-terminated liquid fluorosilicone rubber into the high-speed disperser, then add 20 parts of diatomaceous earth, then add 0.5 parts of platinum and silane complexes, 40 parts of methyl fluorosilicone oil, and stir for 20 minutes. After rough mixing, use a three-roller mill to mix three times, then add it to a planetary mixer, and vacuumize at 60°C until the mixture is uniform and free of air bubbles. After 30 minutes, the material is discharged to obtain component A, which is stored in nitrogen and sealed for later use.

[0038] Add 100 parts of vinyl-terminated liquid fluorosilicone rubber into the high-speed disperser, then add 20 parts of diatomite, mix well, add 10 parts of titanium dioxide, and the...

Embodiment 3

[0041] Add 3 parts of tetramethyldipropenyldisilazane and 1 part of KH570 to 100 parts of titanium dioxide, stir and react in a planetary mixer at 110°C for 2h, then take it out and dehydrate at 105°C for 2h, and dry it for later use.

[0042] Add 100 parts of hydroxyl-terminated liquid fluorosilicone rubber into the high-speed disperser, then add 20 parts of treated titanium dioxide, mix well and add 20 parts of precipitated calcium carbonate, then add 0.5 parts of platinum and silane complexes, 3 parts Methyl fluorosilicone oil, stirred for 20 minutes, after rough mixing, mixed three times with a three-roller mill, then added to a planetary mixer, and vacuumed at 60°C until the mixture was uniform and free of air bubbles, and discharged after 30 minutes to obtain component A , kept sealed under nitrogen gas for later use.

[0043]Add 100 parts of vinyl-terminated liquid fluorosilicone rubber into the high-speed disperser, then add 20 parts of treated titanium dioxide, mix we...

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Abstract

The invention relates to the technical field of fluorosilicone sealants, in particular to a two-component room temperature vulcanized fluorosilicone sealant and a preparation method thereof. The two-component room temperature vulcanized fluorosilicone sealant provided by the invention is prepared from a component A and a component B at the mass ratio of 1:(1-5); the component A comprises hydroxyl-terminated liquid fluorosilicone rubber, a filler, a catalyst and methyl fluorosilicone oil; the component B comprises vinyl-terminated liquid fluorosilicone rubber, a filler, a coupling agent, a crosslinking agent, a catalyst, an inhibitor and hydrogen-containing fluorosilicone oil. The two-component room temperature vulcanized fluorosilicone sealant disclosed by the invention has the advantagesof good adhesion of a condensed silicone sealant and high strength of an addition type silicone sealant, excellent curing performance and wide application. The invention also provides a preparation method that is simple, feasible and favorable for industrial production.

Description

technical field [0001] The invention relates to the technical field of fluorosilicon sealant, in particular to a two-component room temperature vulcanized fluorosilicon sealant and a preparation method thereof. Background technique [0002] There are many types of silicone sealants, and silicone sealants are divided into addition type and condensation type. Condensation type two-component room temperature vulcanization (RTV-2) silicone sealant is one of the commonly used varieties. Condensation type silicone sealant can be divided into dealcohol type, deketoxime type, deacidification type and so on. In actual production, dealcoholized, deketoxime and deacetic acid types are more commonly used; addition-type silicone sealants are cross-linked by the reaction of silicon-hydrogen bonds and vinyl groups in the presence of platinum catalysts. However, silicone sealants are not resistant to oil and non-polar solvents, and cannot be used for sealing lubrication systems, oil tanks,...

Claims

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Application Information

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IPC IPC(8): C09J183/08C09J11/04C09J11/08
Inventor 王军徐凤伟孟祥青岳广张兴超王汉利
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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