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A kind of two-component polyurethane heat-conducting structural adhesive and preparation method thereof

A technology of two-component polyurethane and heat-conducting structure, applied in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the working conditions that cannot meet the high-frequency vibration of power batteries, and do not conduct heat Coefficient research, unsatisfactory use and other problems, to achieve the effect of excellent industrial application prospects, low elastic modulus, and good elastic elongation

Active Publication Date: 2022-04-12
HANGZHOU ZHIJIANG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent with the publication number CN109609081A discloses a polyurethane adhesive for the bonding of power battery PACK structures, and the Chinese patent with the publication number CN110699033A discloses a two-component polyurethane adhesive and its preparation method and application, but these formulations The system has a very high elastic modulus (usually > 1000MPa), which cannot meet the working conditions of the power battery for a long time and high frequency vibration; and the Chinese patent with the publication number CN111303820A discloses a two-component polyurethane for power pool bonding Although the structural adhesive and its preparation method reduce the elastic modulus (400MPa~800MPa) of the product, the modulus is still high, and the elastic elongation of the product is low (about 5%), which cannot meet the requirements of more severe environments. use
And none of the above patents has conducted special research on thermal conductivity

Method used

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  • A kind of two-component polyurethane heat-conducting structural adhesive and preparation method thereof
  • A kind of two-component polyurethane heat-conducting structural adhesive and preparation method thereof
  • A kind of two-component polyurethane heat-conducting structural adhesive and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0104] The present invention also provides a method for preparing the two-component polyurethane thermally conductive structural adhesive described in the above technical solution, comprising the following steps:

[0105] a) Heat polyether polyol, chain extender, first thermally conductive filler and dispersant under stirring to 110°C-130°C and vacuumize to below -90KPa for 1.5h-2.5h, then cool down to below 50°C and add metal Catalyst, vacuum down to below -90KPa and continue stirring for 0.2h to 1h to obtain component A;

[0106] b) Heat the high-reactivity polyisocyanate, polyether diol, and the second thermally conductive filler to 50°C-70°C under stirring for 1.5h-2.5h, then cool down to below 50°C and add low-reactivity polyisocyanate, silane coupling agent, evacuate to below -90KPa and continue to stir for 0.2h to 1h to obtain component B;

[0107] c) Mix the above-mentioned components A and B according to the volume ratio (0.8-1.2): 1 to obtain a two-component polyure...

Embodiment

[0122] (1) Heat polyether polyol A1, chain extender A2, thermally conductive filler and dispersant under stirring to 120°C and vacuumize to below -90KPa for dehydration for 2 hours, then cool down to below 50°C and add metal catalyst, vacuumize to - Continue to stir for 0.5h below 90KPa to obtain component A;

[0123] (2) Heat high-reactivity polyisocyanate, polyether diol A2, dried thermally conductive filler and dispersant to 60°C for 2 hours under stirring, then cool down to below 50°C and add low-reactivity polyisocyanate and silane coupling agent , evacuate to below -90KPa and continue to stir for 0.5h to obtain component B;

[0124] (3) Mix the above components A and B uniformly at a volume ratio of 1:1 to obtain a two-component polyurethane thermally conductive structural adhesive.

[0125] Refer to Table 1 for the component selection and proportioning of Examples 1-6 and Comparative Examples 1-3.

[0126] Table 1 Embodiment 1~6 and the component selection of comparat...

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Abstract

The invention provides a two-component polyurethane heat-conducting structural adhesive, which includes component A and component B with a volume ratio of (0.8-1.2): 1; the component A includes: 10-40 parts by weight of polyether polyol ; 1-10 parts by weight of chain extender; 50-90 parts by weight of first thermally conductive filler; 0.5-3 parts by weight of dispersant; 0.1-1 part by weight of metal catalyst; Parts by weight; 1-15 parts by weight of polyether diol; 1-3 parts by weight of silane coupling agent; 1-5 parts by weight of low-reactivity polyisocyanate; 50-90 parts by weight of the second thermally conductive filler. Compared with the prior art, the two-component polyurethane thermally conductive structural adhesive provided by the present invention adopts specific content components to achieve overall better interaction, and the product provides lower The elastic modulus and better elastic elongation are especially suitable for the bonding of power battery packs.

Description

technical field [0001] The invention relates to the technical field of adhesives, and more specifically relates to a two-component polyurethane heat-conducting structural adhesive and a preparation method thereof. Background technique [0002] In recent years, the development of new energy vehicles has been accelerating, and various automobile OEMs have also proposed development goals for new energy vehicles. Under the dual stimulus of policy and market, in 2020, the production and sales of new energy vehicles will be 1.366 million and 1.367 million, respectively, a year-on-year increase of 7.5% and 10.9%. Power battery packs generally use aluminum profiles, PET film, PC, etc. as the main packaging materials, so the adhesive requirements for adhesive products are relatively high; at the same time, due to the serious heat dissipation of the power battery during use, adhesive products are required in some specific parts It can provide a certain thermal conductivity; on the ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J11/04C08G18/64C08G18/48C08G18/32C08G18/65
CPCC09J175/08C09J11/04C08G18/64C08G18/4825C08G18/4081C08G18/3206C08G18/6511C08K2003/2227C08K3/22
Inventor 孙辉钱晓前周朝栋邢浩陶小乐何永富
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD