Sodium alginate can be made into reactive printing paste, which is helpful for printing and dyeing industry.

　　The reactive printing paste made of sodium alginate has high dye uptake and color giving rate, good printing uniformity, proper printing transparency and stability. Today, Qingdao Nanshan Biotechnology-sodium alginate manufacturer Xiaobian popularized some knowledge about sodium alginate being made into reactive printing paste, hoping to help everyone.

　　The reactive printing paste should have certain wettability, adhesion and cohesion, so that the dye can be printed on the fiber material perfectly. The stress of paste is different with different printing methods. For example, in reactive printing, to print a complete and uniform pattern under stress, it is required that the paste has certain fluidity and can enter the gap of textile organization, but it will not lead to infiltration. Therefore, the rheology of paste is very important. The so-called rheology is the flow or deformation characteristics of fluid under stress. Generally speaking, the rheology of color paste mainly depends on the original paste. Practice has proved that only the original paste made of sodium alginate has the best rheology.

　　Reactive printing paste is printed on textiles after drying and necessary post-treatment. After reactive dyes are printed, they must be steamed or baked before they can be fully dyed into the fiber. Finally, they must be washed with water and soaped to remove paste and undyed dyes. The reactive printing paste made of sodium alginate has a certain adhesion and flexibility after being dried on textiles. Although it is easy to wash off after baking, it makes the fabrics feel soft and not hard.

　　The reactive printing paste made of sodium alginate has high dye uptake and color giving rate, good printing uniformity, proper printing transparency and stability. The transfer and dyeing of reactive dyes from color paste to fiber are mainly completed during steaming or baking. The reactive printing paste made of sodium alginate has certain hygroscopicity, which is helpful to the dissolution of dyes and chemicals and the swelling of fibers during steaming, thus being beneficial to the dyeing of fibers by dyes and increasing the color yield of fabrics.

　　Reactive printing is different from dyeing, it usually only prints patterns on local parts of the fabric. In order to obtain a clear pattern, the printing paste should not only contain necessary chemicals, but also add appropriate paste to prevent the dye from infiltrating. The so-called paste is a kind of substance that increases the viscosity of soluti on, also known as thickener. Most printing and dyeing factories use sodium alginate to make the original paste. Under normal circumstances, sodium alginate is first prepared into thick paste, and then mixed with dyes or pigments, chemicals, cosolvents, dispersants, moisture absorbers and other additives to become reactive printing paste, also known as reactive printing paste.

　　The function of reactive printing paste is to transfer reactive dyes or pigments to fibers smoothly and print clear patterns on fiber materials. Differ ent printing methods and printing objects require different reactive printing pastes. Taking the printing method as an example, during roller printing, the printing paste is placed in the pulp tray, brought to the surface of the flower tube by the pulp feeding roller, and then scraped off the paste on the surface of the flower tube by the scraper, while the paste in the concave pattern is printed on the fabric when the flower tube and the pressure roller are strongly squeezed, which requires very good fluidity and permeability of the paste to the fabric; In screen printing, the printing paste is placed in flat screen or rotary screen, and it is printed on the fabric through the screen only when it is scraped by a scraper. Screen printing requires the paste to have high viscosity, self-uniformity and certain rheology. Rotary screen printing requires paste with high solid content, low viscosity and good rheology.

　　It should be pointed out that, up to now, many manufacturers have not fully understood the inhibition performance of color paste, and the actual production is often judged mainly by experience. Moreover, it is impossible for reactive printing paste to meet all the above requirements, and some factors are mutually restrictive, such as printing transparency and color supply are often contradictory. In addition, the printing cost must also be considered. Therefore, there is no perfect printing paste, and it should be selected flexibly according to the actual situation.