Polyurethane adhesive with high weather resistance and yellowing resistance as well as preparation method and application of polyurethane adhesive

Through the reaction of isocyanate oligomers and polymer polyols and the chain extension reaction of polyacrylate polyols, a high weathering and yellowing resistance polyurethane adhesive is prepared, which solves the problems of the existing polyurethane adhesives being easily turned yellow and insufficient weathering resistance under light and humid environments, and achieves the improvement of yellowing and weathering resistance of the adhesive.

CN119662180APending Publication Date: 2025-03-21HUBEI ENG UNIV
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Patent Information

Application Number
CN202411636985.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-15
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

The existing polyurethane adhesives are prone to yellowing under light, humidity and heat, and the weather resistance of polyurethane adhesives prepared by aliphatic or cycloaliphatic isocyanate is insufficient, resulting in the outdoor sports field being prone to aging and sticky.

Method used

The isocyanate oligomer reacts with polymer polyols, and the chain extension reaction of polyacrylate polyols is prepared by preparing a high weathering and yellowing-resistant polyurethane adhesive without anti-yellowing agent or light stabilizer.

Benefits of technology

The yellowing resistance and weather resistance of polyurethane adhesives have been improved, and the problems of low activity and incomplete reaction of the aliphatic or cycloaliphatic isocyanate preparation adhesives have been overcome, ensuring the long-term stability of outdoor sports venues.

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Abstract

The invention discloses a polyurethane adhesive with high weather resistance and yellowing resistance as well as a preparation method and application of the polyurethane adhesive. The polyurethane adhesive is prepared from the following components in parts by weight on the basis of 10 parts of isocyanate: 72 to 457 parts of polymer polyol, 36 to 111 parts of isocyanate oligomer, 30 to 385 parts of polyacrylate polyol, 15 to 191 parts of plasticizer and 0.8 to 9.5 parts of catalyst. The isocyanate adopted by the invention is aliphatic and / or alicyclic isocyanate and oligomer thereof, and no anti-yellowing agent or light stabilizer is added, so that the problem of yellowing of polyurethane can be thoroughly solved. The preparation method comprises the following steps: reacting aliphatic / alicyclic isocyanate with excessive polymer polyol under the assistance of a small amount of a catalyst, so that the low-activity aliphatic / alicyclic isocyanate is completely reacted to obtain a hydroxyl-terminated polyurethane prepolymer; then reacting with an isocyanate oligomer to completely react a terminal hydroxyl group to obtain a polyurethane prepolymer; and then carrying out chain extension by using polypropylene ester polyol to obtain the polyurethane adhesive with a certain structure and excellent weather resistance and yellowing resistance, and the polyurethane adhesive is widely applied to outdoor sports field materials.
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