Polyurethane with amino-containing side chain and preparation method thereof

Abstract

The invention relates to polyurethane with an amino-containing side chain and a preparation method of the polyurethane. According to the technical scheme, the preparation method comprises the following steps: step 1, adding polymer dihydric alcohol and diisocyanate into an aprotic solvent, stirring for 0.5-6 hours under the condition of N2 atmosphere and 50-100 DEG C, then adding a chain extender, and stirring for 0.5-12 hours under the condition of 50-100 DEG C to prepare polyurethane containing double bonds; and step 2, adding a compound containing sulfydryl and amino and a photoinitiator into the polyurethane containing the double bonds prepared in the step 1, and reacting for 5 seconds to 6 hours under the conditions of room temperature and ultraviolet irradiation, so as to prepare the polyurethane containing the amino on the side chain. The preparation method has the characteristics of simple process, low cost, high efficiency, easiness in regulation and control of polymer structure, low toxicity, environment friendliness and easiness in industrial production, and the prepared polyurethane containing amino on the side chain is high in amino content, controllable, safe, non-toxic and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of polyurethane. Specifically relates to a side chain amino-containing polyurethane and a preparation method thereof. Background technique [0002] Polyurethane has good biodegradability and biocompatibility, and its molecular structure has flexible "tailoring", that is, polyurethane with various chemical structures can be obtained through molecular design. Therefore, it has been widely studied and applied in the field of polymer materials in recent decades. [0003] In order to improve the performance of polyurethane or endow it with functional properties, the introduction of active group amino groups into polyurethane has aroused the interest of many scientists. "An amino-terminated aqueous polyurethane dispersion and its preparation method" (CN104211898B) patented technology, reacting a linear polyurethane prepolymer with a polyamine chain extender to obtain an amino-terminated polyurethane. "A hyperbr...

AI Technical Summary

Problems solved by technology

But there are the following problems: (1) the amino group is only connected to the end of the linear polyurethane, and a polyurethane molecular chain only contains two amino groups, and its amino content is very limited; (2) the prepolymer containing isocyanate is directly connected to the same end Amino hyperbranched polymer reaction, the raw materials used are expensive, and the product structure is difficult to control; (3) heavy metal catalysts need to be used in the preparation process, and their residues in the polymer material have toxicity problems; (4) the method of protection / deprotection is adopted The preparation of amino-containing polyurethanes has problems such as many preparation steps, complicated reaction process, long reaction time, and low reaction efficiency.

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