Introduction to the characteristics and functions of pigment printing additives

Pigment printing is the mechanical fixation of insoluble pigments to the coating with the help of adhesivesfiberdimensional method.

gluingAgent Film-forming polymer substance is one of the main components of paint printing. It is polymerized from monomers. It is in liquid phase or fine powder The polymer 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. Pigment printing auxiliary As an adhesive for pigment printing, it should have high adhesion and good safety , It has light resistance, aging resistance, solvent resistance, acid resistance, corrosion resistance, and is stable against chemicalsstable is fixed, the film is clear and transparent, does not discolor after printing, and does not damage the fiber . 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 usedto learn from each other’s strengths and weaknesses. .

(1) Screen printing adhesives and paint printing adhesives are composed of butyl acrylate and methacrylic acid Stable emulsion of methyl ester copolymer, the difference between them is the different monomer ratio. The ratio of screen printing adhesive is: 70% butyl acrylate, 26% methyl methacrylate, and 4% acrylic amide. The content of methyl methacrylate and acrylamide in pigment printing adhesives is higher than that of the former.

Butyl acrylate and acrylic wax copolymer systems are also used as pigment printing or screen printing Printing adhesives and paint additives can also be used in conjunction with other adhesives as film-forming agents for paint printing. They are 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 adhesiveAgentCopolymer of butyl acrylate, methacrylic acid and hydroxymethylacrylamide. Used as polyester/cotton printing adhesive mixture. AcrylicButyl acidCopolymerized with acrylonitrile,A copolymer system using hydroxymethylacrylamide as the cross-linking agent. It has a blue fluorescent milky white emulsion in appearance. It is a newer adhesive for paint printing and can obtain better results. Fastness and soft feel.

Chitin-based bondingAgentThe general synthesis method of this kind of adhesive is to mix chitin, water, glacial acetic acid and emulsifier evenly, under stirring Beat with styrene-butadiene latex. Generally, chitin only accounts for 1/15 of the amount of styrene-butadiene latex. Suitable for cotton, viscose, silk, polyester, nylon and other fibersPigment printing adhesive for �� and its blended fabrics.

AddedThickCommonly used ones are

①increaseThickAgentPAS,Mixed by a copolymer of acrylic acid and methacrylic acid and a copolymer of styrene and butyl acrylate, can be used to adjust the thickness of printing paste;

②ThickenerPA,Made of acrylic and methacrylic,Copolymer cross-linked with dialcyl phthalate, used to replace natural paste when printing with some disperse dyes.