1. Preface
Paint printing is a printing process that utilizes the principle of forming a film on the surface of a fabric using an adhesive. The coating, which has no affinity or reactivity, is adhered to the fabric and then baked to fix it on the surface, giving the fabric various colors and patterns. Compared with the traditional printing process, pigment printing has many advantages. For example, pigment printing is not limited by fabric fibers or weaving methods; Paint printing generally only requires color fixation after printing without water washing, thus shortening the process flow, saving water, electricity, and gas, and reducing the pollution of printing and dyeing wastewater to the environment. Paint printing has a complete color spectrum, bright colors, and clear printing contours, which is inferior to general dye printing; Special patterns can also be printed. Therefore, this process is widely used in the printing and dyeing industry. According to incomplete statistics, paint printed fabrics account for about 55% of the total printed fabrics worldwide, and in the United States, paint printed fabrics account for 80% of the total printed fabric production. Almost all polyester/cotton fabrics are printed with paint. In recent years, due to factors such as simplified processes and reduced energy consumption, the proportion of pigment printing in China has also been on the rise, accounting for about 20% to 25%. The National Economic and Trade Commission has also included pigment printing as one of the processes for promoting clean production in the textile industry.
2. Requirements for Adhesive in Paint Printing
Paint printing is the mechanical bonding of paint and adhesive onto the surface of fabric fibers, therefore, the role of adhesive in paint printing pigments is crucial. The hand feel, brightness, and various fastness indicators (such as rubbing, washing, and dry cleaning fastness) of printed products largely depend on the quality of the adhesive. Therefore, high-performance adhesives must meet the following requirements: after the adhesive is printed on the fabric, it can be dried and baked to form a colorless and transparent film with strong adhesion, elasticity, and toughness; Resistant to UV radiation, aging, and not yellowing; The film should be resistant to bending, wrinkling, hardening, sticking, adsorption of colored substances, and resistance to organic solvents and other chemicals; The adhesive lotion shall have good storage stability, film formation shall not be too fast, it shall not be skinned or agglomerated when placed at room temperature, the printing paste shall not block the screen or stick to the roller, and it shall be easy to wash; Adhesives also need to have certain heat and frost resistance properties.
3. Polyacrylate adhesive
At present, most of the adhesives used for pigment printing are polymer lotion, but not all lotion can meet the requirements of pigment printing in terms of hand feel, toughness, elasticity, transparency, mechanical strength, adhesion, especially printing fastness and hand feel. The lotion adhesives that can be used for textile printing can be divided into polyacrylate, butadiene, vinyl acetate and polyurethane according to their chemical structures, among which polyacrylate adhesives are the most widely used adhesives.
Cowint is the largest DTF Film Factory in China
