Double-component polyurethane sealant and preparation method and application thereof

A two-component polyurethane and sealant technology, applied in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problem of difficult reinforcement, poor adhesion and shock resistance, and metal spacers Easy to damage the hollow structure and other problems, to achieve the effect of reducing the risk of destroying the hollow structure, fast curing speed, and good industrial application prospects

Active Publication Date: 2019-10-25
ZHENGZHOU ZHONGYUAN SILANDE HIGH TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This kind of special glass building structure has become a symbol of modern architecture, but it has also brought some problems, for example, it is difficult to stabilize and reinforce the large glass, and the adhesion and shock resistance are poor; , the metal spacer is easy to damage the hollow structure under excessive pressure, etc.

Method used

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  • Double-component polyurethane sealant and preparation method and application thereof
  • Double-component polyurethane sealant and preparation method and application thereof
  • Double-component polyurethane sealant and preparation method and application thereof

Examples

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preparation example Construction

[0047] In some embodiments, the preparation method of hydroxyl-terminated polyurethane prepolymer comprises:

[0048] First, add polyol and aliphatic isocyanate to the reaction kettle, and carry out a stirring reaction at a constant temperature of 75°C to 80°C for 0.5h to 1.0h in a vacuum environment with a vacuum degree of -0.09MPa to -0.10MPa;

[0049] Then, remove the vacuum environment, add 0.01 to 0.05 parts of the second catalyst in the reactor, and continue to carry out the secondary stirring reaction at a constant temperature of 75°C to 80°C for 2.0h to 3.0 hours under a vacuum environment with a vacuum degree of -0.09MPa to -0.10MPa h;

[0050] Then, remove the vacuum environment, add 0.01 to 0.05 parts of the second catalyst to the reactor, and continue to carry out three stirring reactions at a constant temperature of 75 ° C to 80 ° C for 0.5 h to After 2.0 h, a hydroxyl-terminated polyurethane prepolymer was obtained.

[0051] In some embodiments, after three sti...

Embodiment 1

[0063] (1) Preparation of hydroxyl-terminated polyurethane prepolymer

[0064] Add 700 g of polyether triols with a molecular weight of 500 and 100 g of polytetrahydrofuran diols with a molecular weight of 650 into a three-necked flask, heat to 100° C., and stir the reaction under a vacuum environment with a vacuum of -0.09 MPa while dehydrating. About 1~2h;

[0065] Then, the temperature of the three-necked flask was lowered to 75°C, nitrogen gas was introduced to release the vacuum environment, 200 g of isophorone diisocyanate was added to the three-necked flask, the vacuum was continued to carry out a stirring reaction for 0.5 h, about 0.01 g of bismuth laurate was added, and the pumping was continued. The second stirring reaction was carried out in vacuum for 2.5 hours, and then about 0.01 g of bismuth laurate was added, and the vacuum was continued to carry out three stirring reactions for 1 hour. After that, the temperature was lowered to 60° C. and stored for later use....

Embodiment 2

[0070] (1) Preparation of hydroxyl-terminated polyurethane prepolymer

[0071] Add 600 g of polyether triols with a molecular weight of 500 and 200 g of polytetrahydrofuran diols with a molecular weight of 650 in a three-necked flask, heat to 120° C., and stir the reaction in a vacuum environment with a vacuum of -0.10 MPa while dehydrating. About 1~2h;

[0072] Then, the temperature of the three-necked flask was lowered to 78°C, nitrogen gas was introduced to release the vacuum environment, 175 g of isophorone diisocyanate was added to the three-necked flask, the vacuum was continued to carry out a stirring reaction for 0.5 h, about 0.01 g of bismuth laurate was added, and the pumping was continued. The second stirring reaction was carried out in vacuum for 2.5 hours, and then about 0.01 g of bismuth laurate was added, and the vacuum was continued to carry out three stirring reactions for 1 hour. After that, the temperature was lowered to 60° C. and stored for later use.

[...

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Abstract

The invention provides a double-component polyurethane sealant and a preparation method and application thereof. The sealant comprises a component A and a component B, wherein the component A is prepared from the components in parts by mass: 25-40 parts of hydroxyl terminated polyurethane prepolymer, 7.5-9.4 parts of a plasticizer, 0.5-2.0 parts of a coupling agent, 50-65 parts of a filler and 0.1-0.5 part of a first catalyst; the component B comprises liquid aromatic isocyanate; the hydroxyl terminated polyurethane prepolymer is obtained by a reaction of 50-70 parts of polyol and 10-40 partsof aliphatic isocyanate, the mass ratio of the component A to the component B is 3 to 1-6 to 1, the double-component polyurethane sealant is a pouring type sealant, has the characteristics of environmental protection, self-leveling, high curing speed, high bonding strength after curing and the like, and can be applied to the manufacture of large plate-shaped glass and glass handrails and pouring and sealing in an U-shaped groove or aconcrete maintenance structure of single glass and angle glass.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a two-component polyurethane sealant and its preparation method and application. Background technique [0002] With the development of modern science and technology and glass technology and the improvement of people's living standards, the function of architectural glass is no longer just to meet the lighting requirements, but to have the functions of adjusting light, heat insulation, safety (bulletproof, anti-theft, fireproof, radiation, anti-electromagnetic interference), art decoration and other characteristics. Especially for many landmark buildings and commercial promotion buildings, more and more super-large plate single glass, angled glass and insulating glass are used to meet their unique design requirements. For example, the exterior wall of the Hangzhou West Lake Apple Store uses a 14.5-meter-wide glass exterior wall, using a total of 11 pieces of custom-made single-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/06C09J11/04C08G18/48C08G18/12C08G18/76C08G18/75
CPCC09J175/08C09J11/06C09J11/04C08G18/4812C08G18/4854C08G18/12C08G18/7671C08G18/755C08G18/724C08K2201/011C08K2003/265C08K5/42C08K3/26
Inventor 张燕红刘亚琼陆瑜翀吕亚真邢凤群张光涛卜涛王华南龚洪洋冯培
Owner ZHENGZHOU ZHONGYUAN SILANDE HIGH TECH CO LTD
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