Preparation method of organic silicon-modified polyurethane copolymer fabric softener

Abstract

The invention discloses a preparation method of an organic silicon-modified polyurethane copolymer fabric softener. The method comprises the following steps: (a) carrying out a stirring reaction on polyether polyol, a hydroxyl-terminated polysiloxane linear body and diisocyanate for 2-3h at the temperature of 75-85 DEG C under the action of a tin catalyst, so as to obtain an isocyanate-terminated organic silicone-modified polyurethane prepolymer; (b) adding a small molecular amine chain extender into the organic silicone-modified polyurethane prepolymer, and carrying out a stirring reaction for 1-2h at the temperature of 50-60 DEG C, so as to obtain an organic silicon-modified polyurethane copolymer; (c) evenly mixing the organic silicon-modified polyurethane copolymer obtained in the step (b) with an emulsifying agent at the temperature of 50-70 DEG C, and slowly adding deionized water into the mixture for emulsifying, so as to obtain the organic silicon-modified polyurethane copolymer fabric softener. The softener prepared by the method is good in stability, endows fabric with excellent softnesss, smoothness and hydrophilic property, has excellent yellowing resistance, and can maintain the brightness of the light-colored fabrics and the whiteness of the white fabrics.

Description

technical field [0001] The invention belongs to the technical field of preparation of polyurethane textile auxiliaries, in particular to a preparation method of organosilicon-modified polyurethane copolymer fabric softener. Background technique [0002] Textile softener is a textile auxiliary that can give fabrics a special feel, among which silicone softener is a very important and commonly used one in textile softener. Silicone softeners are mainly polydimethylsiloxane softeners, which have rich methyl groups and good molecular softness, which can effectively reduce the dynamic and static friction coefficient between fibers and achieve a good softening effect. However, since polydimethylsiloxane (i.e., silicone oil) itself has no hydrophilic groups and groups crosslinked with fibers, the fabrics after finishing are poor in hydrophilicity and washability, resulting in decreased wearing comfort and softness that is not durable. In order to improve this problem, people have ...

AI Technical Summary

Problems solved by technology

However, due to the presence of amino groups, amino-modified silicone oils reduce the whiteness of white fabrics (fabric yellowing) when heated or baked, affecting the color and brightness of light-colored fabrics, and the softeners prepared from such silicone oils have poor stability. In the process of storage, transportation and use, it is prone to defects such as delamination, oil floating, demulsification and oil spot staining