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Two-component polyurethane adhesive having a long open time

A component, composition technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., which can solve the problems of shortened open time, short open time, odor burden and VOC emission

Active Publication Date: 2016-11-09
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the problem of bubble formation can be countered by the use of chain extenders such as diols or diamines while achieving rapid cure at low temperatures and better mechanical properties, the open time is drastically reduced
Although slightly longer open times can be achieved by using oxazolidines as chemically terminated chain extenders along with bismuth catalysts as described in US 5,603,798, the open times are still relatively short and must be tolerated due to release from the oxazolidines. Significant odor burden and VOC emissions caused by volatile capping agents

Method used

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  • Two-component polyurethane adhesive having a long open time
  • Two-component polyurethane adhesive having a long open time
  • Two-component polyurethane adhesive having a long open time

Examples

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Embodiment

[0184] Examples are described below, which explain the present invention in more detail. The invention is of course not limited to the described embodiments.

[0185] 1. Commercially available substances used:

[0186] 4003 / 1 EO-terminated polyoxypropylene triol with 45% by weight of grafted SAN polymer, OH number 20.0 mg KOH / g (from BASF)

[0187] 5028GT EO-terminated polyoxypropylene triol with 20% by weight of PHD polymer, OH value 28.5 mg KOH / g (from Bayer MaterialScience)

[0188] CP 4755 EO-terminated polyoxypropylene triol, OH value 34.7 mg KOH / g (from Dow)

[0189] CD Modified diphenylmethane-4,4'-diisocyanate containing MDI carbodiimide adduct, liquid at room temperature, NCO content 28% by weight (from BayerMaterialScience)

[0190] chalk BLH (from Omya)

[0191] Kaolin (from Engelhard)

[0192] Molecular sieve Molecular sieve powder (from Zeochem)

[0193] Silica Hydrophobically Modified Fumed Silica

[0194] A-209 Zirconium (IV) chelate comp...

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Abstract

The present invention relates to a two-component composition comprising a polymer-polyol, optionally further polyols, an aldimine of the formula (I), a zirconium (IV) catalyst and, in the second component, diphenylmethane diisocyanate. The composition is particularly suitable as a solvent-free, low-odor elastic adhesive. The composition has a particularly long open time, a low density and a high level of final strength and cures quickly and without complications.

Description

technical field [0001] The present invention relates to two-component polyurethane compositions which are particularly useful in elastic bonding applications. Background technique [0002] Elastic adhesive compounds are used in industrial production to join materials so that the joined parts can move relative to one another to a certain extent during vibrations and thus transmit only significantly reduced forces on the respective other component. [0003] Known adhesives for elastic bonding applications are two-component polyurethane compositions based on polyols and polyisocyanates. However, two-component polyurethane compositions are more demanding in application than the likewise frequently used one-component systems, since they presuppose precise metering and thorough mixing of the components in order to achieve the desired properties. To this end, they contain only little or no solvents or diluents or plasticizers, thus have little emission or shrinkage, and cure essen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/63C08G18/65C08G18/76C08G18/80C08G18/12C08G18/22C08G18/32C08K5/29C09J175/08C08G18/08
CPCC08G18/4841C08G18/632C08G18/797C08G18/222C08G18/2815C08G18/3206C08G18/3256C08K5/29C08G18/4072C09J175/04C08L75/04
Inventor R·坎纳斯U·斯塔德尔曼U·布尔克哈德特
Owner SIKA TECH AG
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