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Bi-component polyurethane structural adhesive for bonding power batteries and preparation method thereof

A two-component polyurethane and power battery technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem of difficult to meet the requirements of adhesive performance and toughness at the same time, poor storage stability, and hard structure segment increase

Active Publication Date: 2020-06-19
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] Although epoxy resin adhesives in the prior art have good adhesion to metals, they are not ideal for adhesion to PET materials. Low tolerance to frequency vibration conditions
The second generation of acrylic adhesives has the problems of difficult to meet the requirements of both adhesive performance and toughness at the same time, poor aging performance and poor storage stability.
It can be seen that in the existing patents, polyols containing benzene rings are used. The use of polyols containing benzene rings can improve the infiltration of two-component polyurethane adhesives on the surface of the substrate, thereby improving the plastic materials such as PET and PC, as well as aluminum, steel and The adhesiveness on the surface of metal materials such as its alloys, however, the introduction of polyols containing benzene rings will lead to an increase in the hard segment of the two-component polyurethane structural adhesive, which will lead to an increase in the hardness and modulus of the structural adhesive after curing (usually > 1000MPa), which cannot meet the requirements. Working condition of power battery with long-term high-frequency vibration
The removal of polyols containing benzene ring can reduce the modulus of the two-component polyurethane structural adhesive, but at the same time lead to a decrease in the bonding strength to the profile (aluminum-aluminum shear strength is usually <6MPa)
[0005] In summary, there is currently no two-component polyurethane structural adhesive that can meet the requirements of medium elastic modulus (400-800MPa) and high bonding strength (aluminum-aluminum shear strength > 10MPa).

Method used

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  • Bi-component polyurethane structural adhesive for bonding power batteries and preparation method thereof
  • Bi-component polyurethane structural adhesive for bonding power batteries and preparation method thereof

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preparation example Construction

[0050] The present invention provides a method for preparing a two-component polyurethane structural adhesive for bonding power batteries described in the above technical solution, comprising the following steps:

[0051] Mix 40-65 parts of polymethylene polyphenylisocyanate, 30-50 parts of aluminum hydroxide, 2-5 parts of hydrophobic fumed silica, and 0-5 parts of plasticizer to obtain component A;

[0052] Mix 40-65 parts of bio-based polyol, 1-4 parts of fumed silica, 20-50 parts of flame retardant, 1-5 parts of adhesion promoter and 0.01-0.5 parts of catalyst to obtain component B;

[0053] The A component and the B component are mixed to obtain a two-component polyurethane structural adhesive for power battery bonding.

[0054] The present invention tests the shear strength and elastic modulus of the two-component polyurethane structural adhesive for bonding the power battery described in the above technical solution:

[0055] Shear strength test method: Use unpolished a...

Embodiment 1

[0059] Preparation of Adhesion Promoter:

[0060] Add 255g of N-phenyl-γ-aminopropyltrimethoxysilane into a three-necked flask, stir, heat up to 40°C, add 164g of p-cresyl glycidyl ether, stir and react at 40°C for 2 hours, then cool down and discharge to obtain Adhesion promoter.

[0061] Preparation of component A:

[0062] Add 520g of polymethylene polyphenyl isocyanate PM100, 420g of aluminum hydroxide, 30g of Wacker H18 hydrophobic silica, and 30g of tricresyl phosphate into a planetary mixer, stir and disperse for 2 hours, and obtain component A with a viscosity of about 15Pa· s.

[0063] Preparation of component B:

[0064] Add 550g of Sovermol 760 and 400g of nitrogen-phosphorus flame retardant into a planetary mixer, vacuum dehydrate at 100°C for 2 hours, and cool down to 60°C. Then add 20g of Evonik A380 hydrophilic silica, 29g of the above adhesion promoter, 1g of bismuth laurate catalyst, and stir for 2h under vacuum to obtain component B with a viscosity of ab...

Embodiment 2

[0085] Preparation of Adhesion Promoter:

[0086] 297g of N-phenyl-γ-aminopropyltriethoxysilane was added to the three-necked flask, stirred and heated to 50°C, 164g of o-tolyl glycidyl ether was added, stirred and reacted at 50°C for 1 hour, then cooled and discharged, An adhesion promoter is obtained.

[0087] Preparation of Component A:

[0088] Add 420g polymethylene polyphenyl isocyanate PM130, 500g aluminum hydroxide, 30g Wacker H16 hydrophobic silica, and 50g diphenyl cresyl phosphate into the planetary mixer, stir and disperse for 1.5h to obtain component A, viscosity About 26Pa·s.

[0089] Preparation of Part B:

[0090] 550g of Sovermol 750 and 380g of nitrogen-phosphorus flame retardant were added to the planetary mixer, dehydrated in vacuum at 100°C for 1.5h, and then cooled to 55°C. Then, 35.5g of Wacker T30 hydrophilic silica, 34g of the above-mentioned adhesion promoter, and 0.5g of bismuth neodecanoate catalyst were added, and the mixture was stirred under va...

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Abstract

The invention provides a bi-component polyurethane structural adhesive for bonding power batteries and a preparation method of the bi-component polyurethane structural adhesive. The polyurethane structural adhesive comprises a component A and a component B. The component A comprises 40-65 parts of polymethylene polyphenyl isocyanate, 30-50 parts of aluminum hydroxide, 2-5 parts of hydrophobic fumed silica and 0-5 parts of a plasticizer. The component B comprises the following components in parts by weight: 40-65 parts of bio-based polyol, 1-4 parts of fumed silica, 25-50 parts of a flame retardant, 1-5 parts of an adhesion promoter and 0.01-0.5 parts of a catalyst. The bio-based polyol is selected from one or more of rapeseed oil modified polyol, castor oil modified polyol, soybean oil modified polyol and palm oil modified polyol. The adhesion promoter is prepared by reacting aminophenylsilane with a silane modifier. The adhesive is relatively high in bonding strength and has a mediumelastic modulus. The flame-retardant effect is good, the adhesive has excellent adhesion performance to materials such as bare aluminum and PET films, and the adhesive can be used for structural adhesion of power battery PACKs.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a two-component polyurethane structural adhesive for power battery bonding and a preparation method thereof. Background technique [0002] In recent years, new energy vehicles have developed rapidly. In 2019, the production and sales of new energy vehicles were 1.242 million and 1.206 million respectively. The new energy policy dividend has driven the rapid development of the battery industry. In March 2019, the installed capacity of new energy vehicle power batteries in my country was about 5.09GWh, an increase of 146.3% year-on-year and a month-on-month increase of 126.69%. The rapid development of the industry promotes the development and improvement of related industries. In terms of adhesives for battery PACK structural bonding, because the surface materials of power battery PACK modules include various functional materials such as PET, PC, and aluminum alloys,...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J11/04C08G18/76C08G18/42C08G18/32C08G18/66
CPCC08G18/3218C08G18/4202C08G18/4288C08G18/664C08G18/7664C08K2003/2227C08L2201/02C09J11/04C09J175/06C08K13/06C08K3/22C08K5/523C08K9/00C08K7/26C08K5/544
Inventor 李云龙陶小乐应天祥陈丹孙辉何永富
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD
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