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Adhesive composition

A composition and adhesive technology, applied in the direction of adhesive types, adhesives, polyurea/polyurethane adhesives, etc., can solve the problems of short open time, low strength, etc.

Active Publication Date: 2021-01-19
DDP SPECIALTY ELECTRONICS MATERIALS US LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also well known that, using prior compositions and methods of the prior art, long open times (>8 minutes) can be achieved, but at such long open times undesired open times may occur after one hour at room temperature. Low strength build-up (e.g. lap shear strength less than (<) 0.8MPa)
Alternatively, using known compositions and methods of the prior art, high one-hour room temperature lap shear strengths (e.g., >0.8 MPa) can be achieved, but at this high strength build-up, undesirably short open set time (e.g. <8 minutes)

Method used

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Examples

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example

[0085] The following examples are given to further illustrate the invention, but are not to be construed as limiting the scope of the claims. All parts and percentages are by weight unless otherwise indicated.

[0086] The various raw materials used in the examples are explained below:

[0087] Desmodur N3400, available from Covestro, is an aliphatic polyisocyanate based on hexamethylene diisocyanate.

[0088] Isonate M143 is a liquefied MDI with a functionality of 2.2 and a viscosity of 40 mPa-s. Isonate M143 is available from The Dow Chemical Company (Dow).

[0089] Isonate M342 is a polymeric MDI with a functionality of 2 and a viscosity of 580 mPa-s, available from Dow.

[0090] VORANATE M220 is a polymeric MDI having a functionality of 2.7 and a viscosity of 205 mPa-s, available from Dow.

[0091] Metatin T713 is a tin-based dibutyltinmercaptide catalyst; and available from ACIMA Corporation.

[0092] Di-n-octylbis[isooctylthioglycolate]tin, a tin-based dioctyltinmer...

example 1-8 and comparative example A-D

[0122] Table I below describes the formulations of Comparative Examples A-D and Inventive Examples 1-8; and the results of the performance data after testing the adhesive compositions. The open times of the adhesive compositions of Comparative Examples A-D and Examples 1-8 were measured by the rheological reactivity test described above. Lap shear strength was measured with e-coated steel substrates at 1 h and 7d RT. Lap shear ("1h-lap shear") strength was measured with e-coated steel substrates having bond dimensions of 15 mm x 25 mm x 1.5 mm. Tensile testing was performed on Dogbones 5A test samples as described above. Table I depicts the results of tests performed on Dogbones 5A samples using various adhesives. Lap shear IR thermal cure experiments were run with a heating cycle of 180 s and with CFK substrates (available from Dow) with bond dimensions of 45 mm x 15 mm x 1.5 mm. At a sample thickness of

[0123] Tensile properties were measured at 2 mm.

[0124] It was ...

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PUM

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Abstract

A polyurethane adhesive composition, more specifically a two-component polyurethane adhesive, comprising (a) at least one isocyanate component wherein the isocyanate component comprises (ai) at leastone first polyisocyanate compound, and (ai) at least one second polyisocyanate compound having a functionality of greater than, or equal to, about 2.3; and (b) at least one polyol component; and a method for producing the adhesive composition.

Description

technical field [0001] The present invention relates to an adhesive composition; and more particularly, the present invention relates to a two-part polyurethane adhesive composition, which is particularly useful in automotive applications. Background technique [0002] Reinforced composite materials are increasingly used in modern vehicle designs due to performance advantages and lightweight vehicle requirements. Adhesive joining is the most preferred assembly technique for composite materials, since bonding does not destroy the composite structure (unlike mechanical fastening, like screw joints or riveting, for example). Typically, the use of adhesive technology for part assembly aims to optimize the production process in order to achieve fast adhesive application, rapid strength build-up and rapid development of handling strength. In some cases, accelerated adhesive application, adhesive strength building, and development of adhesive handling strength can be achieved thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/66C08G18/72C08G18/76C08G18/79C09J175/04C09J175/08C08L75/04C08L75/08C08G18/24
CPCC08G18/246C08G18/4829C08G18/6674C08G18/6677C08G18/724C08G18/7664C08G18/7671C08G18/797C08G18/798C08L75/04C08L75/08C09J175/04C09J175/08C09J11/00C09J2301/416C08G18/2063C08G18/242C08G2170/60C08K3/04C08K3/346C08K3/36C08K5/18
Inventor H·吴S·格伦德S·施马特洛赫J·孔茨
Owner DDP SPECIALTY ELECTRONICS MATERIALS US LLC
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