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A kind of low voc organosilicon sealant and preparation method thereof

A silicone and sealant technology, applied in the direction of adhesives, non-polymer adhesive additives, adhesive additives, etc., can solve the problem of large usage of adhesion promoters and coupling agents, affecting the stability of electronic products, and VOC content High-level problems, to achieve stable product quality, faster curing and cross-linking, and lower VOC content

Active Publication Date: 2022-04-12
佛山东麓科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electrical and electronic industry, these volatile small molecules may cause electrical contact barriers, making the circuit short circuit or unable to connect, affecting the stability of electronic products
In the lighting industry, volatile substances may also condense and then adhere to the inner wall of the lampshade to form mist, which affects the light effect of the whole lamp
[0004] In order to improve the adhesive performance of the existing conventional one-component condensation type silicone sealant, the amount of adhesion promoter and coupling agent is often used in a large amount, and the VOC content is relatively high

Method used

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  • A kind of low voc organosilicon sealant and preparation method thereof
  • A kind of low voc organosilicon sealant and preparation method thereof
  • A kind of low voc organosilicon sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of the low VOC silicone sealant of the present embodiment is as follows:

[0044] (1) 100 parts by mass of alkoxy-terminated polydimethylsiloxane (kinematic viscosity at 25° C. is 20 Pa s) with a structure such as formula (3), 80 parts by mass of nano-calcium carbonate with an average particle diameter of 50 nm , and 5 parts by mass of BET specific surface area is 120m 2 / g of fumed silica was added into a vacuum kneader, under the condition of nitrogen protection, dehydration, blending and kneading at 125°C for 120min, and then cooled to obtain the base material;

[0045] (CH 3 )(CH 3 O) 2 SiO-[(CH 3 ) 2 SiO] 1000 -Si(OCH 3 ) 2 (CH 3 ) (3)

[0046] (2) at room temperature, the base material obtained in the above step (1), 6 parts by mass of methyltrimethoxysilane crosslinking agent, the citrate chelate catalyst of 2 parts by mass of isopropyl titanate, and 0.75 parts by mass of a polyfunctional silane coupling agent with the structure ...

Embodiment 2

[0050] The preparation method of the low VOC silicone sealant of the present embodiment is as follows:

[0051] (1) 100 parts by mass of alkoxy-terminated polydimethylsiloxane (kinematic viscosity at 25°C is 50 Pa s) with a structure such as formula (5), 50 parts by mass of nano-calcium carbonate with an average particle diameter of 20 nm , and 10 parts by mass of BET specific surface area is 200m 2 / g of fumed silica was added into the vacuum kneader, under the condition of nitrogen protection, dehydration, blending and kneading at 130°C for 180min, and then cooled to obtain the base material;

[0052] (CH 2 =CH)(CH 3 O) 2 SiO-[(CH 3 ) 2 SiO] 1500 -Si(OCH 3 ) 2 (CH=CH 2 ) (5);

[0053] (2) At room temperature, the base material obtained in the above step (1), a mixed crosslinking agent composed of 3 parts by mass of propyltrimethoxysilane and 1 part by mass of methyltrimethoxysilane, and 1 part by mass of titanic acid Isopropyl ester catalyst, and 0.5 mass parts of...

Embodiment 3

[0057] The preparation method of the low VOC silicone sealant of the present embodiment is as follows:

[0058] (1) 80 parts by mass of alkoxy-terminated polydimethylsiloxane (kinematic viscosity at 25°C is 20 Pa·s), 20 parts by mass of alkoxy-terminated polydimethylsiloxane with the structure of formula (7) Group-terminated polydimethylsiloxane (kinematic viscosity at 25°C is 80 Pa s), 120 parts by mass of nano-calcium carbonate with an average particle size of 30 nm, and 8 parts by mass of BET with a specific surface area of ​​180 m 2 / g of fumed silica was added into the vacuum kneader, under the condition of nitrogen protection, dehydration, blending and kneading at 120°C for 150min, and then cooled to obtain the base material;

[0059] (CH 3 )(CH 3 O) 2 SiO-[(CH 3 ) 2 SiO] 1000 -Si(OCH 3 ) 2 (CH 3 ) (3);

[0060] (CH 3 )(CH 3 O) 2 SiO-[(CH 3 ) 2 SiO] 2000 -Si(OCH 3 ) 2 (CH 3 ) (7);

[0061] (2) At room temperature, the base material obtained in the abo...

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Abstract

The invention provides a low-VOC silicone sealant, which comprises the following preparation raw materials in parts by weight: 100 parts of alkoxy-terminated polydimethylsiloxane, 50-150 parts of nano-calcium carbonate, and 5 parts of fumed white carbon black. -10 parts, 3-6 parts of crosslinking agent, 1-5 parts of catalyst, 0.5-1.5 parts of adhesion promoter; the alkoxy-terminated polydimethylsiloxane has a structure shown in formula (1) A compound or composition, the adhesion promoter is a compound or composition having the structure shown in formula (2). The invention belongs to the technical field of silicone sealants, and provides a low-VOC silicone sealant with low odor, good adhesive performance, storage stability and weather resistance, and can be widely used in household appliances, electronic equipment, lighting fixtures, indoor Bonding and sealing in decoration and other fields.

Description

technical field [0001] The invention belongs to the technical field of silicone sealants, in particular to a low-VOC silicone sealant and a preparation method thereof. Background technique [0002] With the continuous development of social science and technology economy, people pay more and more attention to the problems of quality of life and environmental protection. The influence of volatile organic compounds (Volatile Organic Compounds, VOCs) on human health and the surrounding environment has been paid more and more attention. [0003] One-component condensation type silicone sealants are widely used in household appliances, electronic equipment, lighting fixtures, interior decoration and other fields. When crosslinking and curing, they need to come into contact with water vapor in the air to release small molecules, so certain VOCs. When VOC reaches a certain concentration, it will cause symptoms such as headache, nausea, vomiting, fatigue, etc., and even convulsions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/04C09J183/07C09J11/04C09J11/06C09J11/08
CPCC09J183/04C09J11/04C09J11/06C09J11/08C08L2205/02C08K2201/011C08K2003/265C08L2205/025C08L2205/03C08L83/06C08K13/02C08K3/26C08K3/36C08K5/5419C08L83/04
Inventor 曾智麟李盛开冯芸珍
Owner 佛山东麓科技有限公司
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