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Single-component epoxy modified silicone sealant and preparation method thereof

An epoxy modification and silicone technology, applied in epoxy resin adhesives, adhesives, polymer adhesive additives, etc., can solve the problems of poor adhesion, poor compatibility, and high surface energy, and improve the adhesion Force and elasticity, improve extrusion, improve cohesion effect

Active Publication Date: 2017-04-26
广东长鹿新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polarity of silicone polymer is small, the force between molecules is much weaker than that of hydrocarbons, and the surface energy is small; while epoxy resin is polar, the force between molecules is strong, and the surface energy is high, so silicone resin and ring Oxygen resins have poor compatibility, delamination, low strength after curing, and poor adhesion. Therefore, it is necessary to modify the silicone polymer to improve compatibility, so that the cured product has both silicone and epoxy. Advantages of the resin, thereby improving the overall performance of the sealant

Method used

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  • Single-component epoxy modified silicone sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Add 100 parts of silane-modified polyether resin, 10 parts of bisphenol-A epoxy resin E44, 50 parts of polyethylene glycol with an average molecular weight of 2000, and 100 parts of nano-calcium carbonate into the double planetary dynamic mixing in batches In the barrel, stir evenly and heat to 120°C, dehydrate for 1.5 hours at a vacuum of 0.099Mpa, and rotate at 500rpm.

[0048] (2) Cool down to room temperature with cooling water at a speed of 300 rpm.

[0049] (3) Add 2 parts of methyltrimethoxysilane and 2 parts of aminopropyltrimethoxysilane into the mixing tank of the planetary machine in batches, and stir for 20 minutes at a vacuum degree of 0.099Mpa at a rotation speed of 400rpm.

[0050] (4) Add 2 parts of dibutyltin dioctoate, stir for 30 minutes at a vacuum degree of 0.099Mpa and a rotation speed of 400rpm, and then pack and discharge to obtain a one-component epoxy-modified silicone sealant.

Embodiment 2

[0052] (1) Add 100 parts of silane-modified polyether resin, 20 parts of bisphenol A epoxy resin E51, 75 parts of polypropylene glycol with an average molecular weight of 2000, and 170 parts of nano-calcium carbonate into the barrel of the double planetary dynamic mixer in batches Inside, after stirring evenly, heat to 120°C, dehydrate for 1 hour under a vacuum of 0.099Mpa, and rotate at 800rpm.

[0053] (2) Cool down to room temperature with cooling water at a speed of 400 rpm.

[0054] (3) Add 2.5 parts of methyltriethoxysilane and 4 parts of aminopropyltriethoxysilane in batches into the mixing tank of the planetary machine, and stir for 20 minutes at a vacuum degree of 0.099Mpa at a rotation speed of 500rpm.

[0055] (4) Add 3 parts of ethyl acetoacetate organotin chelate, stir for 30 minutes at a vacuum of 0.099 MPa and a rotation speed of 400 rpm, then pack and discharge to obtain a one-component epoxy-modified silicone sealant.

Embodiment 3

[0057] (1) 100 parts of silane-modified polyether resins, 30 parts of bisphenol A type epoxy resin E45, 110 parts of polytetrahydrofuran glycol with an average molecular weight of 3000, and 270 parts of nanometer calcium carbonate were added in batches. In the barrel of planetary power mixer, stir evenly, heat to 120°C, dehydrate for 2 hours at a vacuum of 0.099Mpa, and rotate at 600rpm.

[0058] (2) Cool down to room temperature with cooling water at a speed of 500 rpm.

[0059] (3) Add 4 parts of methyltrimethoxysilane and 2 parts of aminopropyltrimethoxysilane into the mixing tank of the planetary machine in batches, and stir for 20 minutes at a vacuum degree of 0.099Mpa at a rotation speed of 400rpm.

[0060] (4) Add 2 parts of dibutyltin dioctoate, stir for 30 minutes at a vacuum degree of 0.099Mpa and a rotation speed of 400rpm, and then pack and discharge to obtain a one-component epoxy-modified silicone sealant.

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Abstract

The invention discloses a single-component epoxy modified silicone sealant and a preparation method thereof. the sealant is composed of, by mass, 100 parts of silane modified polyether resin, 10-50 parts of epoxy resin, 80-150 parts of plasticizers, 150-300 parts of nano calcium carbonate, 1-6 parts of first cross-linking agents, 3-10 parts of second cross-linking agents and 2-7 parts of catalysts. The advantages of the epoxy resin and the silane modified polyether resin are combined, the bonding powder, the tensile strength, the elasticity and the weather resistance of the sealant can be improved, and the sealant can be used for the different fields such as constructional engineering, electronics, the automobile industry and space flight and aviation. The sealant has the characteristics that the performance advantages of silicone and the epoxy resin are combined, the silicone and the epoxy resin are subjected to a cross-linking reaction with water molecules and the cross-linking agents under the action of the catalysts, and a three-dimensional spatial netty structure is formed. A cured system is high in binding performance and excellent in mechanical performance and weather resistance.

Description

technical field [0001] The invention relates to a one-component epoxy-modified silicone sealant and a preparation method thereof, belonging to the technical field of polymer materials and building sealants. Background technique [0002] Silicone is based on a silicon-oxygen (Si-O) bond as the main chain structure, OH is terminated, the main chain is very supple, and the intermolecular force is much weaker than that of hydrocarbons, so the polymer viscosity is low and the surface tension is low. Weak, small surface energy, strong film-forming ability, good high and low temperature resistance, weather resistance, good elasticity, and outstanding waterproof performance. It is not only used as a special material in cutting-edge technical departments such as aviation and military, but also used in various fields such as construction engineering, electronic and electrical, textile industry, automobile machinery, leather and paper making, chemical light industry, etc. [0003] Epo...

Claims

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Application Information

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IPC IPC(8): C09J171/00C09J163/00C09J11/04C09J11/06C09J11/08
CPCC08K2201/011C08L2201/08C08L2205/025C08L2205/03C08L2312/08C09J11/04C09J11/06C09J11/08C09J171/00C08L63/00C08L71/00C08K13/06C08K9/04C08K2003/265C08K5/5419C08K5/5425C08K5/544
Inventor 何晓军陈家荣马营张剑叶永称罗文军梁真福张柳君陈晓航
Owner 广东长鹿新材料科技有限公司
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