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Two-component polyurethane composition with delayed crosslinking

A two-component polyurethane and composition technology, applied in the direction of polyurea/polyurethane adhesives, layered products, adhesive types, etc., can solve the problem of inability to obtain defect-free matrix materials, short effective service life, unsuitability, etc. question

Active Publication Date: 2013-09-18
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this leads to a short effective life for bonding large surfaces and workpieces
These adhesives are also not suitable for evenly filling large molds with adhesive, since a defect-free matrix material cannot be obtained by rapid reaction

Method used

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  • Two-component polyurethane composition with delayed crosslinking
  • Two-component polyurethane composition with delayed crosslinking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] The invention is illustrated by the following examples.

[0050] Measurement methods:

[0051] Viscosity: Brookfield RVT (ISO EN2555), at a given temperature

[0052] Glass transition temperature (Tg): DSC

[0053] Effective pot life: These two components are brought to 25°C and mixed in a predetermined ratio. Viscosity was measured at regular intervals. The time when the viscosity rises above 50000mPas is determined as the effective use period.

[0054] Tensile strength, elongation at break, E modulus: DIN EN ISO527 (test speed 1mm / min)

[0055] Shear strength, shear deformation, shear modulus: DIN EN ISO14129 (test rate 2mm / min)

[0056] Fiber content: DIN EN ISO1172

[0057] The ingredients of the polyol component were mixed and dried in vacuum. Similarly, the ingredients of the NCO component were mixed. For use, components A and B are mixed in a ratio of 1.1 at room temperature and subsequently filled into vertical plate molds. Hardening was carried out at ...

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Abstract

The invention relates to a crosslinking two-component polyurethane composition consisting of (i) a constituent A containing polyols and additives, and (ii) a constituent B containing between 100 and 65 wt. % of aromatic polyisocyanates, between 0 and 35 wt. % of aliphatic polyisocyanates, and between 0.05 and 3.0 wt. % of a retarder, and optionally additives, the mixed composition having a viscosity (EN ISO 2555) of between 100 mPas and 3000 mPas at 25 DEG C, and the crosslinked composition having a glass transition temperature (Tg) of higher than 50 DEG C and a pot life of longer than 60 minutes. The two-component polyurethane composition is suitable as an adhesive and as a matrix substance for composite materials.

Description

technical field [0001] The invention relates to crosslinkable two-component polyurethane-based compositions suitable as adhesives and as matrix binders for bonding composite elements made of fiber materials and fiber materials. The invention also relates to a method for producing fiber composite parts from the bicomponent composition and fibers. Background technique [0002] WO 2004 / 029121 describes two-component polyurethane adhesives composed of polyols based on diols and triols, which are crosslinked by polyisocyanates. Furthermore, considerable amounts of pigments, such as highly dispersed silica, fillers and molecular sieves, are contained in the binder. There is no mention of highly functional polyols to increase network density. Aromatic isocyanates are used as crosslinkers. There is no mention of adding substances that delay the reaction. [0003] WO2002 / 066572 describes two-component polyurethane adhesives for wood containing up to 98% of oleochemical polyols, 1...

Claims

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Application Information

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IPC IPC(8): C08G18/08C08G18/72C08L75/04C09J175/04C08K5/09
CPCC08G18/089C08G18/724C08G18/725C08K3/16C08K3/24C08K5/09C09J175/04C08L75/04C08G18/08C08G18/72B27N3/10B29C43/00B32B27/40C08G18/65
Inventor L·蒂勒W·于特纳O-K·冈本
Owner HENKEL KGAA
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