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Preparation method for single-component organic silicon transparent sealant

A silicone and sealant technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of rapid temperature increase, increased consumption, high coupling agent price, and achieve good stability , the effect of fast curing speed

Active Publication Date: 2014-09-03
RIFENG ENTERPRISE GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method has the following disadvantages: 1. With the addition of fumed silica, the consistency of the rubber material will gradually increase. Under the stirring action of the high-speed disperser, the internal temperature of the rubber material will also slowly increase. increase, the internal temperature of the rubber compound will also increase rapidly, and it is not easy to conduct
During this process, the presence of excess catalyst will make the catalytic reaction and end capping of the system more active and sufficient. Although it can greatly improve the surface drying and curing speed of sealant products, due to the excessive reaction of the glue making process, its storage is stable. sex will get worse
2. Generally speaking, the price of the coupling agent is relatively high, and its group activity is also high, and it is easy to react and change color, etc., so the addition ratio should not be too high
Adding the coupling agent before adding gas-phase silica will greatly increase its consumption and reduce the coupling and bonding effect of the sealant product

Method used

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  • Preparation method for single-component organic silicon transparent sealant
  • Preparation method for single-component organic silicon transparent sealant
  • Preparation method for single-component organic silicon transparent sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a one-component silicone transparent sealant, the steps are as follows:

[0021] (1) 100 parts of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 80000 centipoise, 45 parts of simethicone with a viscosity of 350 centipoise, and 0.025 parts of transparent color paste (yellow powder: dimethyl Silicone oil = 1:100), put them into the mixing tank respectively, stir at a stirring speed of 300 rpm for 10 minutes, and at the same time evacuate to -0.08MPa, and turn on the mixing tank to circulate cooling water, the bottom goes in and the top goes out, the cooling water The temperature is set to 17°C;

[0022] (2) Nitrogen release vacuum to normal pressure, add 10 parts of crosslinking agent methyl tributylketoxime base silane and 0.02 part of catalyst dibutyltin dilaurate (accounting for 20% of catalyzer gross weight), with 300 rpm Stir at a stirring speed for 10 minutes, and keep the vacuum at -0.08MPa during the stirring process;

[0023] (3)...

Embodiment 2

[0027] A preparation method of a one-component silicone transparent sealant, the steps are as follows:

[0028] (1) 100 parts of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 80000 centipoise, 45 parts of simethicone with a viscosity of 350 centipoise, and 0.025 parts of transparent color paste (yellow powder: dimethyl Silicone oil = 1:100), put them into the mixing tank respectively, stir at a stirring speed of 300 rpm for 10 minutes, and at the same time evacuate to -0.08MPa, and turn on the mixing tank to circulate cooling water, the bottom goes in and the top goes out, the cooling water The temperature is set to 17°C;

[0029] (2) Nitrogen release vacuum to normal pressure, add 10 parts of crosslinking agent methyl tributylketoxime base silane and 0.04 part of catalyst dibutyltin dilaurate (accounting for 40% of catalyzer gross weight), with 300 rpm Stir at a stirring speed for 10 minutes, and keep the vacuum at -0.08MPa during the stirring process;

[0030] (3)...

Embodiment 3

[0034] A preparation method of a one-component silicone transparent sealant, the steps are as follows:

[0035] (1) 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 80000 centipoise, 45 parts of simethicone oil with a viscosity of 350 centipoise, and 0.025 parts of transparent color paste (yellow powder: dimethyl Silicone oil = 1:100), put them into the mixing tank respectively, stir at a stirring speed of 300 rpm for 10 minutes, and at the same time evacuate to -0.08MPa, and turn on the mixing tank to circulate cooling water, the bottom goes in and the top goes out, the cooling water The temperature is set to 17°C;

[0036] (2) Nitrogen release vacuum to normal pressure, add 10 parts of crosslinking agent methyl tributylketoxime base silane and 0.06 part of catalyst dibutyltin laurate (accounting for 60% of catalyzer gross weight), with 300 rpm Stir at a stirring speed for 10 minutes, and keep the vacuum at -0.08MPa during the stirring process;

[0037](...

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PUM

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Abstract

The invention discloses a preparation method for single-component organic silicon transparent sealant. The preparation method is as follows: adding alpha,omega-dyhydroxyl polydimethyl siloxane and dimethyl silicone oil, and stirring for uniformly mixing; then, adding a cross-linking agent and a catalyst which accounts for 20%-80% of the total weight, and adding fumed silica after uniformly stirring; adding a coupling agent and the catalyst which accounts for 80%-20% of the total weight after stirring. In the method disclosed by the invention, one part of the catalyst is added at the glue-preparing early stage, and one part of the catalyst is added before discharging, so that the bonding stability of the organic silicon transparent sealant can be greatly improved on the premise of not greatly lowering the vulcanization speed of the sealant, and storage stability of the sealant is effectively increased.

Description

technical field [0001] The invention relates to a silicone building sealant, in particular to a preparation process of a single-component silicone transparent sealant. technical background [0002] In the 1960s, a one-component room temperature vulcanized silicone rubber elastic sealant came out. This silicone sealant has excellent weather resistance and durability, can be cured at room temperature, and is easy to use, making it suitable for construction and indoor sealing. fields are widely used. Compared with other sealants, the comprehensive performance and process performance are superior, and silicone sealants are accepted by more and more customers. One-component silicone neutral transparent sealant is a kind of one-component silicone sealant, and it is a very representative high-demand product in one-component silicone sealant. In various fields, Especially in the field of construction, its production and sales volume is huge. Due to the vast market and wide range ...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J183/04C09J11/06C09J11/04
Inventor 邓叔元张升李白千彭晓翊
Owner RIFENG ENTERPRISE GRP CO LTD