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Single-component transparent organic silicon sealant as well as preparation method and application thereof

A silicone and sealant technology, applied in the direction of adhesives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve the problems of increased viscosity, poor storage stability, poor thixotropy, etc., and achieve bonding strength. Excellent, widely applicable effect

Active Publication Date: 2021-06-04
GUANGZHOU MECHANICAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using conventional 107 liquid silicone rubber as the base polymer, during the preparation process of the one-component dealcoholized silicone sealant, its silanol group will react with the catalyst, resulting in an increase in viscosity and a "viscosity peak" phenomenon, which needs to be maintained for a period of time. It can only be lowered after a long time, so the process control is difficult and the production is unstable
In addition, the one-component dealcoholized silicone sealant prepared from hydroxyl-terminated polysiloxane has the problem of poor storage stability
[0004] Invention patent CN 106190012B describes that the reinforcing fumed silica is hydrophilic, and the plasticizer is non-reactive silicone oil. The prepared one-component dealcoholized silicone sealant has low transparency, is not resistant to boiling, and has thixotropy. Difference

Method used

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  • Single-component transparent organic silicon sealant as well as preparation method and application thereof
  • Single-component transparent organic silicon sealant as well as preparation method and application thereof
  • Single-component transparent organic silicon sealant as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] As a one-component transparent silicone sealant in an embodiment of the present invention, the silicone sealant includes the following components in parts by mass, 100 parts of alkoxy-terminated silicone rubber, 20 parts of diluent, 5 parts of Fumed silica, 5 parts of cross-linking agent, 0.4 part of catalyst A, 1 part of adhesion promoter, the cross-linking agent is a compound type alcohol type cross-linking agent, and the compound type alcohol type cross-linking agent Agents include at least one alkoxysilane and (CH 2 =CCH 3 -O) 3 -SiCH 2 CH 2 Si(OCH 3 ) 3 , the compound alcohol type crosslinking agent is CXT-10 of Jiangsu Kexing New Material Co., Ltd.;

[0034] The diluent is a low-viscosity monomethoxy-terminated silicone oil, and the viscosity of the low-viscosity monomethoxy-terminated silicone oil is 20mPa.s;

[0035] The fumed silica is hydrophobic fumed silica, and the BET specific surface area of ​​the silica is 170m 2 / g;

[0036] Described catalyst ...

Embodiment 2

[0047] As a one-component transparent silicone sealant of the embodiment of the present invention, the difference between this embodiment and embodiment 1 is:

[0048] Specifically, the preparation method of the alkoxy-terminated silicone rubber in Example 2 includes the following steps: add 107 liquid silicone rubber with a viscosity of 5000 mPa.s into a dried three-necked flask, and under nitrogen protection, magnetically stir and heat up to 80°C ; Add end-capping agent vinyltrimethoxysilane, catalyst tetramethylammonium hydroxide, continue to stir and react for 60 minutes at 80°C under nitrogen protection, neutralize the alkalinity of the system, raise the temperature to 120°C, stir in vacuum for 60 minutes, and remove volatile matter , to obtain alkoxy-terminated polysiloxane.

[0049] The preparation method of the one-component transparent silicone sealant of the present embodiment comprises the following steps:

[0050] (1) Add 100 parts of the alkoxy-terminated liquid ...

Embodiment 3

[0054] As a one-component transparent silicone sealant of the embodiment of the present invention, the difference between this embodiment and embodiment 1 is:

[0055] Specifically, the preparation method of the alkoxy-terminated silicone rubber of Example 3 comprises the following steps: adding 2×10 4 107 liquid silicone rubber with a viscosity of mPa.s, under the protection of nitrogen, magnetically stir, and heat up to 80°C; Make the system alkaline, raise the temperature to 120°C, stir in vacuum for 60 minutes, and remove volatile matter to obtain alkoxy-terminated polysiloxane.

[0056] The preparation method of the one-component transparent silicone sealant of the present embodiment comprises the following steps:

[0057] (1) Add 100 parts of alkoxy-terminated liquid silicone rubber of this embodiment, 15 parts of monomethoxy-terminated silicone oil with a viscosity of 100mPa.s and 3 parts of BET with a specific surface area of ​​230mPa. 2 / g of hydrophobic fumed silic...

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Abstract

The invention provides a single-component transparent organosilicon sealant and a preparation method thereof, the organosilicon sealant comprises the following components in parts by mass: 100 parts of alkoxy-terminated silicone rubber, 10-20 parts of a diluent, 3-10 parts of fumed silica, 3-10 parts of an alcohol type cross-linking agent, 0.1-0.4 part of a catalyst A, and 1-5 parts of an adhesion promoter, and the alcohol type cross-linking agent. The single-component transparent organic silicon sealant adopts the alkoxy-terminated silicone rubber, the alkoxy-terminated silicone rubber replaces hydroxyl of 107 silicone rubber through alkoxy, and the alkoxy-terminated silicone rubber is matched with the fumed silica, the alcohol type cross-linking agent and the bonding accelerant, so that the single-component transparent organic silicon sealant is high transparency, excellent in bonding strength, can resist long-term boiling, and can be widely applied to the field of electronic and electrical appliances.

Description

technical field [0001] The invention relates to the field of silicone sealants, in particular to a single-component transparent silicone sealant and its preparation method and application. Background technique [0002] Silicone sealant is one of the important process materials widely used in the assembly and manufacturing of home appliances, etc. It plays an important role in structural reinforcement, sealing and rust prevention, vibration and noise reduction, and simplification of manufacturing processes. In recent years, with the demand for the development of the small household appliances industry towards environmental protection, energy saving, and light weight, the development of silicone sealants suitable for various application environments has become more and more important. The one-component dealcoholized silicone sealant has the characteristics of no corrosion to the substrate, no irritating odor, and good bonding applicability. It is widely used in the fields of e...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/04C09J11/06C09J11/08
CPCC09J183/06C09J11/04C09J11/06C09J11/08C08L2201/10C08L2205/02C08K2201/006
Inventor 李吉明刘桂恒高燕邓娟罗靖宜韦园思
Owner GUANGZHOU MECHANICAL ENG RES INST
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