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Non-traditional moisture cured catalysts and cold curing polyisocyanate adhesives prepared therefrom

A polyisocyanate and adhesive technology, applied in the field of polyisocyanate adhesives and composite products, can solve problems such as unsatisfactory performance, incomplete curing, slow curing of adhesives, etc.

Inactive Publication Date: 2007-11-21
HUNTSMAN INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these adhesive systems when used in laminated wood applications showed excessive delamination under cold curing conditions and unsatisfactory performance when tested according to ASTM D-2559-00
It is assumed that the delamination problem may be caused by slow curing and / or incomplete curing of the adhesive

Method used

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  • Non-traditional moisture cured catalysts and cold curing polyisocyanate adhesives prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Preparation of phenylisocyanate-terminated T-304

[0059] This example shows the preparation of at least partially blocked derivatives of amine alkoxylates. The amine alkoxylate used was the TETRONIC(R) T-304 product and the monofunctional blocking agent was phenylisocyanate.

[0060] A sample of TETRONIC(R) T-304 product was obtained from BASF Corporation. This material has the following properties: number average MW = 1650; nominal hydroxyl functionality of 4 (nominal functionality is the active hydrogen functionality of the initiator, in this case ethylenediamine), and number average equivalent weight = 412.5. The nominal hydroxyl functionality is very close to the number average hydroxyl functionality for this system. All of the amine groups in T-304 are believed to be tertiary amine groups. Phenyl isocyanate was obtained from Aldrich Chemical Co. This material has the following properties: molecular weight (absolute value) = 119.12; isocyanate functi...

Embodiment 2

[0062] Example 2: Application of the phenylisocyanate-terminated T-304 prepared in Example-1 in a one-component polyisocyanate wood adhesive under cold curing conditions

[0063] A series of polyisocyanate adhesive formulations were prepared using phenylisocyanate terminated T-304 (according to the invention). These samples were compared to LS-4800 as a control, which implements the technology disclosed in US Patent 6,368,714. Polyisocyanate adhesives comprising phenylisocyanate-terminated T-304 were prepared by blending the specified polyisocyanate product with the specified amount of P.I.-blocked T-304 at ambient laboratory temperature (about 25° C.), and Any free OH groups on the capped T-304 were allowed to react over a period of about 24 hours.

[0064] Laminated wood composite test samples were prepared and tested according to ASTM D-2559-00 sections 10 and 11. The wood used for these studies was Southern Ponderosa Pine, which was cut to 6' x 12' x 3 / 4" dimensions, san...

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Abstract

Cold curing polyisocyanate adhesive compositions suitable for use in the preparation of engineered lumber composites. Additionally provided are catalysts comprising tertiary amine alkoxylates that are reduced in or substantially free of isocyanate-reactive hydroxylic or amine hydrogen atoms. Further provided is a process for preparing composites articles using the adhesive compositions and composite articles prepared from the adhesive compositions. Composite articles prepared from the adhesive compositions have a substantially increased resistance to delamination.

Description

field of invention [0001] The present invention relates to adhesive systems, and more particularly to cold curing catalysts for polyisocyanate adhesives, polyisocyanate adhesives prepared using such catalysts, adhesive bonds prepared from such adhesives A method for preparing a composite article, and a composite article bonded by such an adhesive. Background of the invention [0002] Organic polyisocyanate binders are well known for the production of reinforced wood composites such as particle board (OSB), fiberboard, and related composite wood products. Polyisocyanate binders are also known for use in the preparation of engineered wood composites such as I-beams (I-beams), laminated veneer lumber (LVL), and other types of structural wood composites. It is believed that curing of the polyisocyanate in these end use applications is facilitated by the moisture present in the wood substrate. In commercial wood composite panels, such as OSB, heated presses...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/50C08G18/71C08G18/10C08G18/12C08G18/79C09J175/12
CPCC08G18/794C08G18/12C08G18/5021C09J175/12C08G18/71C08G18/10C08G18/307
Inventor J·J·马钦科A·A·帕克H·R·吉利斯
Owner HUNTSMAN INT LLC