Synthesis of a high-fastness cationic silica/fluorine-free acrylate water repellent and its application in fabrics. (9th December 2022)

• Record Type: Journal Article
• Authors: An, Xiaonan; Zhou, Panfei; Jiang, Yang; Miao, Dagang; Xiao, Guowei; Xu, Changhai; Du, Jinmei
• Is Part Of: New journal of chemistry. Volume 47:Number 2(2023)
• Page Start: 910
• Page End: 918
• Publication Date: 2022-12-09
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj05226a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Synthesis of a high-fastness cationic silica/fluorine-free acrylate water repellent and its application in fabrics. Abstract : Appropriate surface roughness can enhance the hydrophobicity of low-surface tension materials. SiO2 can increase the roughness of hydrophobic films. However, it is negatively charged and incompatible with cationic water-repellent emulsions. In this paper, a SiO2 /fluorine-free acrylate water-repellent emulsion (SKD + /FFA) in which cationic modified SiO2 built a chemical bond with the acrylate component was synthesized and coated on fabric to achieve high fastness and excellent hydrophobicity. SiO2 covered with polymer brushes containing cationic groups and carbon–carbon double bonds (SKD + ) was obtained after the modification of SiO2 with 3-methacryloxypropyltrimethoxysilane (KH570), 2-(dimethylamino) ethyl methacrylate (DMAEMA), and 3-bromopropene in order. SKD +, methyl methacrylate (MMA), butyl acrylate (BA), and octadecyl acrylate (SA) undergo a free radical polymerization reaction and can form a cationic SiO2 /fluorine-free acrylate emulsion (SKD + /FFA). FT-IR spectra suggested that the modification of SiO2 was successful. The mean particle size and electric potential were tested by dynamic light scattering. The core–shell structure of SKD + /FFA was characterized by TEM, and the surface morphology of the coated fabric was investigated via SEM. The results indicated that the modified SiO2 was well dispersed in acrylate emulsion and was evenly distributed on the fabric surface due to the positive charge and chemical bonding with acrylate. Compared with FFA without SiO2 (FFA), SKD + /FFA films had a higher thermal decomposition temperature and a slower decomposition rate. Fabric coated with SKD + /FFA was better than the one coated with FFA in whiteness and hydrophobicity (water repellency), showing good water repellency after 50 launderings.