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Two-component polyurethane potting glue and its preparation method and application method

A two-component polyurethane, potting glue technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc. Small space, good stability and convenient construction

Active Publication Date: 2021-03-23
GUANGZHOU GBS HIGH TECH & IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with epoxy potting compound, polyurethane potting compound has good elasticity, and compared with silicone potting compound, it has high cohesion, high strength and outstanding bonding performance, but it also has disadvantages such as lower hardness.
At present, most polyurethane potting adhesives on the market are used in two-component combination, and the mixing operation is easy to generate air bubbles, and during the curing process, NCO is very easy to react with moisture in the air to produce CO 2 , leading to defects in the appearance and performance of the product, often need to be vacuumized during the curing process
In addition, polyurethane generally has a high viscosity, which is not conducive to filling the small space in the mold during the potting process, and it is difficult to discharge air bubbles

Method used

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  • Two-component polyurethane potting glue and its preparation method and application method
  • Two-component polyurethane potting glue and its preparation method and application method
  • Two-component polyurethane potting glue and its preparation method and application method

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Experimental program
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Embodiment 1

[0029] The two-component polyurethane potting compound provided in this embodiment consists of a first component and a second component. Wherein, the first component includes the following components in parts by weight: 48 parts of castor oil, 12 parts of polyether trihydric alcohol, 3 parts of BYK-066N defoamer of German BYK company, 0.1 part of KH560 coupling agent, oxidation 1 part of calcium water remover, 3 parts of fumed silica rheology additive, 30 parts of calcium carbonate inorganic filler. Wherein, the number average molecular weight of the polyether trihydric alcohol is 1500, and the hydroxyl value is 100 mgKOH / g.

[0030] The second component is diphenylmethane diisocyanate. The first component and the second component can be used after being fully mixed according to the mass ratio of 3:1.

[0031] The preparation method of the above-mentioned two-component polyurethane encapsulant comprises the following steps:

[0032] Vacuum dehydrate castor oil, polyether tr...

Embodiment 2

[0034] The two-component polyurethane potting compound provided in this embodiment consists of a first component and a second component. Among them, the first component includes the following components in parts by weight: 30 parts of castor oil, 20 parts of polyether glycol, 1 part of BYK-066N defoamer, 4 parts of KH560 coupling agent, oxazolidine dehydration 3 parts of agent, 2 parts of BYK-410 rheological additive of German BYK company, 60 parts of aluminum hydroxide inorganic filler. Among them, the polyether diol has a number average molecular weight of 700 and a hydroxyl value of 300 mgKOH / g.

[0035] The second component is formed by mixing diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanate at a mass ratio of 3:1. The first component and the second component can be used after being fully mixed according to the mass ratio of 2:1.

[0036] The preparation method of the above-mentioned two-component polyurethane encapsulant comprises the following s...

Embodiment 3

[0039] The two-component polyurethane potting compound provided in this embodiment consists of a first component and a second component. Among them, the first component includes the following components in parts by weight: 10 parts of polyether diol, 20 parts of polyether triol, 0.1 part of BYK-066N defoamer, 5 parts of KH560 coupling agent, molecular sieve 10 parts of water agent, 3 parts of organic bentonite rheology additive, 70 parts of alumina inorganic filler. Among them, the number average molecular weight of the polyether diol is 2500, and the hydroxyl value is 40 mgKOH / g; the number average molecular weight of the polyether triol is 300, and the hydroxyl value is 400 mgKOH / g.

[0040] The second component is polymethylene polyphenyl polyisocyanate. The first component and the second component can be used after being fully mixed according to the mass ratio of 5:1.

[0041] The preparation method of the above-mentioned two-component polyurethane encapsulant comprises ...

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Abstract

The invention relates to two-component polyurethane pouring sealant, which is prepared from a first component and a second component, wherein the first component is prepared from the following components in parts by weight: 30-60 parts of polymer polyol, 0.1-3 parts of a defoaming agent, 0.1-5 parts of a coupling agent, 1-10 parts of a water removal agent, 0.1-3 part of a rheological additive and30-70 parts of inorganic filler; the second component contains isocyanate. The two-component polyurethane pouring sealant has good stability, and the anti-settling ability generally reaches 12 monthsor more; furthermore, the two-component polyurethane pouring sealant has an automatic defoaming ability, and does not need to be vacuumed during curing; in addition, the pouring sealant provided by the invention has the advantage of being high in hardness, is low in viscosity and convenient in construction, and is good for filling the small spaces in a mold.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a two-component polyurethane potting adhesive and a preparation method and application method thereof. Background technique [0002] Polyurethane potting glue, also known as PU potting glue, is usually composed of oligomer polyols such as polyester, polyether and polydiene, and diisocyanate, with diols or diamines as chain extenders, and gradually polymerized. become. The characteristics of polyurethane potting materials are low hardness, moderate strength, good elasticity, water resistance, mold resistance, shock resistance, transparency, electrical insulation and flame retardancy, no corrosion to electrical components, and no corrosion to steel, aluminum, copper, tin and other metals and Rubber, plastic, wood and other materials have good adhesion. Potting materials can protect installed and debugged electronic components and circuits from vibration, corrosion, moisture and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/14C09J11/04C09J11/06C08G18/48C08G18/67
CPCC08G18/36C08G18/4812C08G18/4825C08G18/4829C08G18/6696C08K3/346C08K3/36C08K5/5435C08K2003/2227C08K2003/265C08K2003/3045C09J11/04C09J11/06C09J175/14
Inventor 石金亨段先健吴春蕾
Owner GUANGZHOU GBS HIGH TECH & IND