Isocyanate-free polyurethane UV resin and preparation method thereof

Abstract

Isocyanate-free polyurethane UV resin is prepared after cyclic carbonate reacts with amine oligomer. Cyclic carbonate is prepared from cyclic carbonate polymers with few repeated units, and cyclic carbonate polymers are reactants obtained after carbon dioxide and epoxy compound are subjected to a coupling reaction under the catalysis of a novel coupling reaction catalyst. By means of the isocyanate-free polyurethane UV resin, the defect that polyurethane UV resin manufactured through the traditional preparation process is plentiful in harmful substance is overcome, the hydrolytic stability, chemical resistant stability, seepage resistance and other characteristics of the polyurethane UV resin are improved, the environment is protected, and the damage of polyurethane to human body health is reduced to the maximum extent; through the method of replacing isocyanate with cyclic carbonate, toxic isocyanate is not used as the raw material, the adhesive force and wear resistance of the resin are remarkably improved, the resin can be used for wet base materials and low-temperature curing, the concentration of carbon dioxide in the atmosphere is reduced, and energy conservation and environment protection are achieved.

Description

technical field [0001] The patent of the present invention relates to the technical field of a synthetic resin and its preparation method, especially a kind of isocyanate-free polyurethane UV resin and its preparation method. The invention adopts the alternative method of using cyclocarbonate instead of isocyanate, and does not use toxic isocyanate as raw material. It improves the hydrolysis stability, chemical resistance stability, and permeability resistance of traditional polyurethane UV resins, and is suitable for crack-resistant materials, chemical-resistant coatings, sealants, paints, etc. The invention is safe, non-toxic, solvent-free, etc. Advantages, adhesion and wear resistance are significantly improved, can be used for wet substrates and low-temperature curing, save energy, and reduce the damage to human body and environment. Background technique [0002] Isocyanate is a general term for various esters of isocyanic acid. If it is classified by the number of -NCO ...

AI Technical Summary

Problems solved by technology

[0005] Since the traditional polyurethane uses the above two isocyanates as the main raw materials, the production process uses highly toxic phosgene as an auxiliary means. The production conditions are extremely harsh and the cost is very high, and the isocyanates used in the traditional technology encounter When it reaches water molecules, it is easy to separate and release CO2. If this defect is used in coatings, adhesives or elastomers, it may cause air bubbles and sand holes when the product is shaped due to the release of carbon dioxide, which seriously affects the quality control of the finished product. , and it will cause great harm to the human body and the environment in the production, transportation, storage and use links;