Transparent, fast-cured and thixotropic dealcoholization one-component silicone rubber

A fast-curing, dealcoholization technology, applied in adhesives, other chemical processes, chemical instruments and methods, etc., can solve the problems of unsatisfactory product storage performance, decreased use performance, troublesome production, etc., to improve storage stability, excellent Thixotropy, effect of short curing time

Inactive Publication Date: 2014-08-27
SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this production method, when the catalyst is added to the product, the rubber material has a thickening process, and it needs to be placed for a period of time before the consistency decreases, which brings trouble to production. At the same time, the storage performance of the product is not ideal. After a period of time, the use performance will decrease. Compared with the vulcanization speed and performance after vulcanization at the initial stage of preparation, there is a big difference, and yellowing will occur at the same time

Method used

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  • Transparent, fast-cured and thixotropic dealcoholization one-component silicone rubber
  • Transparent, fast-cured and thixotropic dealcoholization one-component silicone rubber
  • Transparent, fast-cured and thixotropic dealcoholization one-component silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 40 parts by weight of trimethoxysilane-terminated polydimethylsiloxane (viscosity: 20,000 cps at 25°C), 60 parts by weight of end-methyldimethoxysilane-end polydimethylsiloxane (viscosity: 20,000 cps at 25°C) Parts by weight, 10 parts by weight of fumed white carbon black was put into a double planetary mixer, vacuumized and stirred for 20-30min, and then 6 parts by mass of methyltrimethoxysilane, 2 parts by mass of tetra-tert-butyl titanate, 3-(methyl 1.5 parts by mass of acryloyloxy)propyltriethoxysilane, vacuumize and stir for 20-30 minutes, then discharge and seal for storage.

[0050] The prepared RTV-1 silica gel has good transparency, excellent thixotropy, surface drying time of 7 minutes (temperature 23 ℃ / humidity 55%), 24 hours of curing 5mm, tensile strength of 1.8MPa, fracture productivity of 350%, Shore hardness of 35 , After 12 months of storage, there is no significant difference between extrusion vulcanization and the newly produced silica gel.

Embodiment 2

[0052] 20 parts by weight of trimethoxysilane-terminated polydimethylsiloxane (viscosity: 50,000 cps at 25°C), 80 parts by weight of end-methyldimethoxysilane-end polydimethylsiloxane (viscosity: 80,000 cps at 25°C) Parts by weight, 5 parts by weight of polydimethylsiloxane (viscosity of 1000cps at 25°C), 10 parts by weight of fumed silica, put into a double planetary mixer, vacuumize and stir for 20~30min, then add tetraethyl orthosilicate 5 parts by mass, 4 parts by mass of tetra-tert-butyl titanate, 0.005 parts by mass of dibutyltin dilaurate, 1.5 parts by mass of γ-[(2,3)-epoxypropyl]propyltrimethoxysilane, vacuum stirring After 20-30 minutes, the material is sealed and stored.

[0053] The prepared RTV-1 silica gel has good transparency, excellent thixotropy, surface drying time 2min (temperature 23 ℃ / humidity 55%), 24h curing 7mm, tensile strength 1.6MPa, fracture productivity 470%, Shore hardness 29 , After 16 months of storage, there is no significant difference betwe...

Embodiment 3

[0055] 100 parts by weight of polydimethylsilane (viscosity of 50,000 cps at 25°C) and 5 parts by weight of polydimethylsiloxane (viscosity of 1,000 cps at 25°C) of methyldimethoxysiloxane-terminated polydimethylsiloxane, vapor phase whitening Put 15 parts by weight of carbon black into a double planetary mixer, vacuumize and stir for 20~30min, then add 2 parts by mass of methyl trimethoxy, 4 parts by mass of methyl orthosilicate, 6 parts by mass of tetra-tert-butyl titanate, γ- 1 part by mass of aminopropyltrimethoxysilane, 0.5 part by mass of N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, vacuumize and stir for 20 to 30 minutes, then discharge and seal for storage.

[0056] The prepared RTV-1 silica gel has good transparency, excellent thixotropy, surface drying time of 2 minutes (temperature 23 ℃ / humidity 55%), 24 hours of curing 6mm, tensile strength of 2.1MPa, fracture productivity of 410%, Shore hardness of 33 , After 16 months of storage, there is no significant differe...

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Abstract

The invention provides transparent, fast-cured and thixotropic dealcoholization one-component silicone rubber. Polydimethylsiloxane of tail end trimethoxy silanesilicon and polydimethylsilane of tail end methyl dimethoxy silica are used as a body, components are weighed and comprise, by weight, 0-40 parts of the polydimethylsiloxane of tail end trimethoxy silane, 60-100 parts of the olydimethylsilane of the tail end methyl dimethoxy silica, 0-20 parts of polydimethyl siloxane fluid, 5-20 parts of vapor phase method silicon dioxide, 0.24-8 parts of catalysts, 0.1-3 parts of tackifier and 1-7 parts of cross-linking agents, and the catalysts are organic titanium or catalytic compositions of organic titanium and organic tin. The invention further provides a preparation method of the material. The rubber has the good transparency, good adhesion and stable storage performance, and has the advantages of being high in curing speed, adjustable in time and free of pollution in production. The rubber is used for device adhesion of electronic devices, adhesion of various lamps and the like, and is easy to produce and high in production efficiency.

Description

technical field [0001] The invention relates to room temperature vulcanized silicone rubber, in particular to a transparent, fast-curing and thixotropic dealcoholized one-component silicone rubber, which belongs to the field of polymer sealing materials. technical background [0002] One-component room temperature vulcanization (hereinafter referred to as RTV-1) silicone rubber has excellent heat resistance, natural aging resistance, moisture resistance and air permeability, as well as excellent electrical properties and chemical inertness. It is widely used in medical treatment and daily life. [0003] Deacidification type and deketoxime type RTV-1 transparent silicone rubber technology has been very mature. The deacidified silicone rubber will release acidic small molecules, which are corrosive to metal objects, but will produce irritating sour taste; the deketoxime silicone rubber is corrosive to copper, and will crack when it is bonded to PC. The problem limits the app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08L83/04C08K13/02C08K3/36C09J183/06C09J183/04C09J11/04C09K3/10
Inventor 周渭国何秀冲潘仕荣赵勇刚
Owner SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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