Polyimide resin for improving hydrophobicity of cotton fabric and preparation method thereof

The invention discloses polyimide resin capable of improving hydrophobicity of cotton fabrics and a preparation method thereof.Silicon-oxygen bonds and carbon-carbon double bonds are introduced into polyimide resin, the silicon-oxygen bonds can be hydrolyzed to be combined with hydroxyl on cellulose of the cotton fabrics, the carbon-carbon double bonds can be subjected to thermal crosslinking with the cellulose in a high-temperature environment, and the hydrophobicity of the cotton fabrics is improved; therefore, a stable coating with a covalent bond structure is obtained on the surface of the cotton fabric and is washable; in addition, the aliphatic long chain on the polyimide resin can endow the cotton fabric with good hydrophobicity. 本发明公开一种改善棉织物疏水性的聚酰亚胺树脂及其制备方法，本发明通过在聚酰亚胺树脂中引入硅氧键和碳碳双键，硅氧键可水解与棉织物纤维素上的羟基结合，碳碳双键可在高温环境中与纤维素发生热交联，从而在棉织物表面获得具有共价键结构的稳固涂层，耐水洗；另外聚酰亚胺树脂上的脂肪族长链可赋予棉织物良好的疏水性。