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Two-component pouring sealant as well as preparation method and application thereof

A potting glue, two-component technology, applied in the field of potting glue, can solve the problems of unrepairable recycling, environmental pollution, etc.

Active Publication Date: 2022-03-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the application provides a two-component encapsulant and its preparation method and application. The two-component encapsulant is stable during use after encapsulating electronic components, and the PPC contained in it can be used in a weakly alkaline environment. It can be degraded into small molecular compounds and can be degraded by composting, which solves the technical problem that electronic components in the prior art cannot be repaired and recycled after being potted with electronic glue, and are likely to cause environmental pollution

Method used

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  • Two-component pouring sealant as well as preparation method and application thereof
  • Two-component pouring sealant as well as preparation method and application thereof
  • Two-component pouring sealant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 of the present application provides the first method for preparing a two-component encapsulant, including the preparation of component A and component B.

[0039] (1) Preparation of component A

[0040] Calculated in parts by mass, vacuum dehydrate 60 parts of polypropylene carbonate with a molecular weight of 1000g / mol and 40 parts of polypropylene carbonate with a molecular weight of 2000g / mol at 110-120°C for 2-3 hours, then lower the temperature to 60-70°C , add 0.08 parts of organometallic catalyst stannous octoate, add 25 parts of isophorone diisocyanate and gradually raise the temperature to 75-85°C for reaction within 30 minutes, pass nitrogen protection during the reaction, and test the NCO% value, the NCO% value When the set value is reached, the reaction is stopped, and anti-aging agent 2,6-di-tert-butyl-4-methylphenol is added to obtain component A, and the set value is within the range of 5% to 15%.

[0041] (2) Preparation of component B

[004...

Embodiment 2

[0044] Example 2 of the present application provides a second method for preparing a two-component encapsulant, including the preparation of component A and component B.

[0045] The difference with Example 1 is that the preparation raw material ratio of A component and B component is:

[0046]

[0047]

Embodiment 3

[0049] Example 3 of the present application provides a third method for preparing a two-component potting compound, including the preparation of component A and component B.

[0050] The difference with Example 1 is that the preparation raw materials of A component and B component are:

[0051] raw material Component A Polypropylene carbonate polyol (Mn=2000) 60 Polypropylene carbonate polyol (Mn=3000) 40 Toluene diisocyanate (MDI) 20 Catalyst (Stannous Octanoate) 0.08 Anti-aging agent (2,6-di-tert-butyl-4-methylphenol) 0.1 raw material Component B Chain extender (butanediol) 3 Crosslinking agent (trimethylolpropane) 0.5 Defoamer BYK-A530 0.1 UV absorber (2-hydroxy-4-n-octyloxybenzophenone) 0.2 A component and B component mass mixing ratio 100:15

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Abstract

The invention belongs to the technical field of pouring sealants, and particularly relates to a two-component pouring sealant as well as a preparation method and application thereof. The double-component pouring sealant provided by the invention is soaked in a weakly alkaline solution such as ethanolamine, water molecules in the solution can be adsorbed to a pouring sealant molecular chain and have a hydrolysis reaction with ester groups on the pouring sealant molecular chain to generate a short molecular chain, and the short molecular chain is continuously hydrolyzed into a small molecular chain, so that the double-component pouring sealant loses strength and can be removed; the removed pouring sealant can be degraded through compost without causing environmental pollution, so that the technical problem that in the prior art, electronic components cannot be maintained and recycled after being poured with the electronic sealant, and environmental pollution is easily caused is solved.

Description

technical field [0001] The application belongs to the technical field of potting glue, and in particular relates to a two-component potting glue and its preparation method and application. Background technique [0002] Potting adhesives are used for bonding and sealing electronic components to achieve dust-proof, moisture-proof, shock-resistant, and corrosion-resistant effects. Currently, commonly used potting adhesives include epoxy potting adhesives, silicone potting adhesives, and polyurethane potting adhesives; Polyurethane contains a unique soft and hard segment phase separation structure. Therefore, after the polyurethane potting adhesive is potted, the colloid part has good elasticity, wear resistance, and impact resistance, which can ensure the work of components in harsh environments. Improve the stability and service life of components. [0003] However, when there is a local problem with the electronic components after polyurethane potting, because the currently ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/06
CPCC09J175/04C09J11/06C08K5/132Y02E10/50
Inventor 区炜刘保华艾娇艳宋丽娜
Owner GUANGDONG UNIV OF TECH
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