Pigment printing is a method in which insoluble pigments are mechanically fixed to fibers with the help of adhesives.
Binder is a film-forming polymer substance, which is one of the main components of pigment printing. It is polymerized from monomers. It is in liquid phase or The fine powder phase exists in the printing paste. After the solvent or other solution evaporates through heating, under the action of the cross-linking agent, they polymerize with each other to form a strong film, fixing the paint on the fiber.
It can be seen that the fastness of pigment printing is mainly determined by the adhesive. As a binder for paint printing, paint printing additives should have high adhesion, good safety, light resistance, aging resistance, solvent resistance, acid resistance, and corrosion resistance. They should be stable to chemicals and form a clear and transparent film. After printing, Does not discolor and does not damage fibers. It is elastic and less affects the feel of the fabric. It is easy to remove from the printing equipment.
Generally speaking, a single resin cannot fully meet the above requirements. Two or more resins need to be used to complement each other.
(1) Screen printing adhesives and paint printing adhesives are stable emulsions copolymerized by butyl acrylate and methyl methacrylate. The difference is that the monomer ratio is different. The ratio of screen printing adhesive is: 70% butyl acrylate, 26% methyl methacrylate, and 4% acrylic amide. Both methyl methacrylate and acrylamide in pigment printing adhesives are higher than the former.
Butyl acrylate and acrylic wax copolymer systems are also used as paint printing or screen printing printing adhesives. Paint additives can also be combined with other adhesives Used as a film-forming agent for pigment printing, it is also a type of copolymer emulsion. It is suitable for white and light-colored pigment printing adhesives, and is more suitable for fluorescent pigment printing adhesives.
Hydroxymethylacrylamide cross-linked printing adhesive is a copolymer of butyl acrylate, methacrylic acid and hydroxymethylacrylamide. Used as polyester/cotton Printing adhesive. Butyl acrylate and acrylonitrile are copolymerized with hydroxymethylacrylamide as the cross-linking agent. The appearance is blue fluorescent milky white emulsion. It is a newer adhesive for paint printing and can obtain better fastness and softness. feel.
Chitin-based adhesives are generally synthesized by mixing chitin, water, glacial acetic acid and emulsifier evenly, then Beat with styrene-butadiene latex while stirring. Generally, chitin only accounts for 1/15 of the amount of styrene-butadiene latex. Suitable for pigment printing adhesive for cotton, viscose, silk, polyester, nylon and other fibers and their blended fabrics.
Commonly used thickening systems are
①Thickener PAS, which is mixed with a copolymer of acrylic acid and methacrylic acid and a copolymer of styrene and butyl acrylate, can be used to adjust printing colors Slurry thickness;
② Thickener PA, a copolymer of acrylic acid and methacrylic acid cross-linked with dipropylene phthalate, used for partial disperse dye printing Replace natural paste.
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