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Polyurethane sealant

A polyurethane sealant and polyurethane technology, applied in the field of sealant, can solve problems such as thermal insulation, poor heat dissipation, poor heat conduction, failure of electronic components, etc., and achieve good storage stability, good economic and social benefits, and durability Effect of grinding performance on storage stability

Inactive Publication Date: 2017-08-18
WUHU HONGSHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, the existing sealant is mainly used in electronic components, and electronic components are often in a high-temperature working state. When the heat dissipation performance of the sealant is not good, it will cause the electronic components to fail or be damaged due to local overheating. However, the sealant in the prior art often only plays the role of sealing and fixing, not only can not conduct heat well, but also is more unfavorable for heat dissipation because of its heat insulation; therefore, how to improve the existing sealant to achieve the ideal Heat dissipation performance is a technical problem that needs to be solved urgently in this field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A polyurethane sealant made by mixing the following components by weight percentage:

[0023] Silylated polyurethane 40 parts

[0024] Filling 45 parts

[0025] Plasticizer 10 parts

[0026] Catalyst 2.5 parts

[0027] 2.5 parts of water remover.

Embodiment 2

[0029] A polyurethane sealant made by mixing the following components by weight percentage:

[0030] Silylated polyurethane 40 parts

[0031] Nano calcium carbonate 47 parts

[0032] Diisodecyl phthalate 8 parts

[0033] 2 parts dibutyltin dilaurate

[0034] 3 parts water remover.

[0035] At the same time, in this embodiment, the following components are also included: a mixture of sodium bicarbonate particles and carbon powder, and the particle size of the mixture is less than 0.1 mm. When the sealant has just been filled into the position to be sealed, the hot air from the blower will heat the sealant to above 50°C, and stop heating after 30 seconds. Since solid sodium bicarbonate begins to decompose gradually above 50°C to generate carbon dioxide, the generation of carbon dioxide inside the sealant makes a porous micro-breathable structure inside the sealant, which is conducive to the convective heat transfer of the sealant (because the above-mentioned breathable struc...

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Abstract

The invention discloses a polyurethane sealant. The polyurethane sealant is prepared from silylated polyurethane, a filling, a plasticizer, a catalyst and a moisture scavenger through mixing. By utilizing silylated polyurethane, the polyurethane sealant has the advantages of polyurethane and an organic silicon material and has damp-hot resistance, oil resistance, chemical resistance, wear resistance and good storage stability. Meanwhile, by adding nano-calcium carbonate capable of well reinforcing silylated polyurethane, the polyurethane sealant has good comprehensive performance and economic and social benefits and is low in cost. Meanwhile, the polyurethane sealant further contains a mixture of sodium hydrogen carbonate particles and carbon powder, wherein the particle size of the mixture is less than 0.1mm. When a to-be-sealed position is filled with the sealant just now, the sealant is heated to above 50 DEG C by virtue of hot wind produced by a blowing machine, and the heating is stopped after 30 seconds. The invention provides a novel sealant with a good heat dissipation function.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a polyurethane sealant. Background technique [0002] Silanized polyurethane has the advantages of both polyurethane and silicone materials, and has heat resistance, oil resistance, chemical resistance, wear resistance and good storage stability, and has broad application prospects in the fields of automobiles, construction and electronics. However, due to the low strength of silanized polyurethane itself, if it is used to prepare sealants, reinforcing fillers must be added. Adding fillers can improve the physical properties of sealants and reduce costs at the same time. Due to the unique quantum size effect, surface and interface effect and small size effect, nanomaterials have many physical properties that macroscopic substances do not have. [0003] At the same time, the existing sealant is mainly used in electronic components, and electronic components are often in a high-temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/04C09J11/06
CPCC09J175/04C08K3/26C08K5/12C08K5/57C08K13/02C08K2003/265C08K2201/011C09J11/04C09J11/06
Inventor 甘露轩慎亚王俊飞
Owner WUHU HONGSHENG TECH
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