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One-component dealcoholized low-modulus silicone weather-resistant sealant and preparation method thereof

A dealcohol-type, low-modulus technology, which is applied in chemical instruments and methods, adhesives, and other chemical processes, can solve problems such as low elastic recovery rate, prolonged surface dry time, and non-compliance, achieving high elongation, The effect of short dry time and low modulus

Active Publication Date: 2021-06-08
GUANGZHOU JOINTAS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, from the performance data of the product of embodiment, its elastic recovery rate is very low, no more than 2.5%, and this is not up to standard, also can not satisfy actual requirement
[0006] In addition, the existing one-component dealcoholized silicone sealants mainly reduce the modulus by adding traditional alcohol-type chain extenders, but traditional alcohol-type chain extenders such as dimethyldimethoxysilane The chain extension efficiency is low, so in order to achieve a good chain extension effect, the amount needs to be increased; however, with the increase in the amount of chain extender, the surface dry time will gradually prolong, and the silicone weather-resistant sealant prepared in this way is not conducive to actual construction used in

Method used

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  • One-component dealcoholized low-modulus silicone weather-resistant sealant and preparation method thereof
  • One-component dealcoholized low-modulus silicone weather-resistant sealant and preparation method thereof
  • One-component dealcoholized low-modulus silicone weather-resistant sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The invention provides a one-component dealcoholized low-modulus silicone weather-resistant sealant, which includes: 200 parts of α, ω-dihydroxypolydimethylsiloxane, 250 parts of calcium carbonate, 15 parts of thixotropic agent, 15 parts of simethicone, 10 parts of chain extender, 16 parts of crosslinking agent, 5 parts of coupling agent and 8 parts of catalyst.

[0030] Wherein the α, ω-dihydroxy polydimethylsiloxane is selected from room temperature vulcanized methyl silicone rubber produced by Hoshine Silicon Industry Co., Ltd., and the viscosity at 25° C. is 100,000 mPa·s.

[0031] Described calcium carbonate includes heavy calcium carbonate and light calcium carbonate, and the weight ratio of described heavy calcium carbonate and described light calcium carbonate is 2:1, and described light calcium carbonate is selected from Guangxi Guilin Jinshan chemical industry For JS-930 produced by Co., Ltd., the average particle diameter of the heavy calcium carbonate is 1 μ...

Embodiment 2

[0042] The difference between the one-component dealcoholized low-modulus silicone weather-resistant sealant of Example 2 and Example 1 is that the α, ω-dihydroxypolydimethylsiloxane contains The viscosity of the mixture is 50000mPa·s and 120000mPa·s, and its weight ratio is 1:8.

[0043] The weight ratio of the heavy calcium carbonate and the light calcium carbonate is 3:1, the average particle diameter of the heavy calcium carbonate is 3 μm, and the average particle diameter of the light calcium carbonate is 0.06 μm, the The moisture content of calcium carbonate is 0.16%.

[0044] The simethicone oil includes a viscosity of 100mm at a temperature of 25°C 2 / s and 2000mm 2 / s mixture, its weight ratio is 1:10.

[0045] The weight ratio between the first chain extender and the second chain extender is 4:5.

[0046] The crosslinking agent is selected from D-150 produced by Hubei New Blue Sky New Material Co., Ltd.

[0047] The difference between the preparation method of t...

Embodiment 3

[0049] The difference between the one-component dealcoholized low modulus silicone weather-resistant sealant of Example 3 and Example 1 is that the α, ω-dihydroxypolydimethylsiloxane contains The viscosity of the mixture is 10000mPa·s and 200000mPa·s, and its weight ratio is 5:6.

[0050] The weight ratio of described heavy calcium carbonate and described light calcium carbonate is 4:1, and the average particle diameter of described heavy calcium carbonate is 5 μ m, and the average particle diameter of described light calcium carbonate is 0.07 μ m, and described The moisture content of calcium carbonate is 0.14%.

[0051] The simethicone oil includes a viscosity of 500mm at a temperature of 25°C 2 / s and 1000mm 2 / s mixture, its weight ratio is 1:7.

[0052] The weight ratio between the first chain extender and the second chain extender is 5.5:5.

[0053] The crosslinking agent is selected from LT-171 produced by Hubei New Blue Sky New Material Co., Ltd.

[0054] The diff...

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Abstract

The invention relates to a one-component dealcoholized low-modulus silicone weather-resistant sealant and a preparation method thereof, belonging to the field of silicone weather-resistant sealants, including: α, ω-dihydroxy polydimethylsiloxane, carbonic acid Calcium, thixotropic agent, simethicone oil, chain extender, crosslinking agent, coupling agent and catalyst, the chain extender includes the first chain extender and the second chain extender, the first chain extender is silane low Polymer, the second chain extender is a solid silane of long-chain carbosiloxy group; during the preparation process, the order of adding the crosslinking agent, the first chain extender and the second chain extender is as follows: the first chain extender agent, crosslinking agent and second chain extender. By selecting a suitable chain extender and improving the preparation process, the present invention obtains a one-component dealcoholized silicone sealant that is environmentally friendly, has a short surface-drying time, low modulus, and high elongation, and is suitable for filling super high-rise buildings. Joints, large concrete facilities, roads, bridges, airport runways and other facilities concrete expansion joints sealing, to meet the requirements of the industry and the market.

Description

technical field [0001] The invention relates to a one-component dealcoholized low-modulus silicone weather-resistant sealant and a preparation method thereof, belonging to the field of silicone weather-resistant sealants. Background technique [0002] Structural joints refer to the joints set between two adjacent buildings or two parts of buildings to avoid temperature expansion and contraction, foundation settlement and earthquake collision, including construction joints, expansion joints, settlement joints and seismic joints, etc. seam. In order to prevent corrosion between structural joints, it is necessary to pour joint sealant between structural joints. Seam sealant refers to a type of adhesive used to fill the joints of structural parts and has a sealing effect. It is usually required that this type of adhesive has a low curing shrinkage rate and a high elongation rate, which can stabilize the bonding interface and is compatible with elasticity or elasticity. Plastic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/04C09J11/04C08G77/38C09K3/10
CPCC08G77/38C08K2003/265C08K2201/014C08L2205/025C09J11/04C09J183/04C09K3/10C08L83/04C08K3/26
Inventor 谢丽莎林坤华肖珍石正金余飞
Owner GUANGZHOU JOINTAS CHEM