Polyurethane type UV viscosity-reducing adhesive and preparation method thereof

• Main Authors: XU WEIBING, REN FENGMEI, LI MENG, MA HAIHONG, ZHOU ZHENGFA, FENG CAIXING
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2021
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES

The invention provides a polyurethane type UV viscosity-reducing adhesive and a preparation method thereof. The polyurethane type UV viscosity-reducing adhesive comprises hydroxyl-terminated itaconic acid-aliphatic diol copolyester, diisocyanate and a photoinitiator. According to the invention, the hydroxyl-terminated itaconic acid-aliphatic diol copolyester is introduced into the UV viscosity-reducing adhesive; itaconic acid molecules contain two carboxyl groups and a double bond, and the double bond on a side chain and the carboxyl groups form a conjugation relationship, so high reaction activity is obtained; and the double bond is subjected to a cross-linking reaction under UV irradiation, so the 180-degree peel strength of the viscosity-reducing adhesive is reduced to 0.4 N/25 mm, viscosity-reducing effect is remarkable, and the phenomena of residual adhesive or debonding do not exist. 本发明提出一种聚氨酯型UV减粘胶及其制备方法，该聚氨酯型UV减粘胶包括端羟基衣康酸-脂肪族二醇共聚酯、二异氰酸酯和光引发剂。本发明在UV减粘胶中引入端羟基衣康酸-脂肪族二醇共聚酯，衣康酸分子中含有两个羧基和一个双键，侧链上的双键与羧基形成共轭