Foam printing is a special Effect printing process. Also known as three-dimensional printing, the foam printing process is developed on the basis of the glue printing process. Its principle is to add several certain proportions of high expansion coefficient chemical substances to the glue printing dye, and the printed positions are dried. The foam is then foamed at a high temperature of 200-300 degrees to achieve a three-dimensional effect similar to a “relief”. The foam printing process can produce high, medium and low foaming effects according to the requirements of the substrate, which is very eye-catching. The biggest advantage of the foam printing printing process is that it has a strong three-dimensional effect and the printing surface protrudes and expands. Widely used in cotton, nylon cloth and other materials.
Coating foam printing paste is composed of fully aqueous binder, foaming agent, stabilizer, cross-linking agent, coating, etc. Sodium lauryl sulfate can be used as the foaming agent, and ammonium stearate, lauryl alcohol, etc. can be used as the stabilizer. The adhesive can be polyacrylic acid, acrylic acid copolymer, hydroxyethyl cellulose, sodium alginate or cellulose derivatives. Among them, hydroxyethyl cellulose has the effect of improving foam stability, and sometimes no binder is needed when using it.
Paint foam printing is suitable for flat screen printing, rotary screen printing, and roller printing. There will be no clogging, no splashing, and no dragging knife during the printing process. , no negative color, cross-color phenomenon, no stain on the interlining.
Introduction to lauryl alcohol as a stabilizer:
According to the supply of lauryl alcohol: lauryl alcohol is a light yellow oily liquid or solid, which crystallizes into flakes in acetic acid. It has a slight aroma of moonflower and violet, and has a weak but long-lasting oily smell. It is insoluble in water.
Production method:
1. High-pressure hydrogenation: Coconut oil is continuously hydrogenated in a copper-chromium catalyst to obtain C8-C18 Mix alcohol. The glycerin in the oil is hydrogenolyzed into isopropyl alcohol and water. After the mixed fatty alcohols are frequently pressure evaporated to remove the water and isopropyl alcohol, C8-C10 alcohols, C12-C14 alcohols and C16-C18 alcohols are distilled under reduced pressure.
2. Esterification and hydrogenation method: Coconut oil undergoes a transesterification reaction with methanol in the presence of sulfuric acid to generate methyl laurate and glycerol. After catalytic hydrogenation and distillation, lauryl alcohol is obtained.
Uses:
Lauryl alcohol is used to make high-efficiency detergents, surfactants, foaming agents, hair sprays, and milk extracts. agents, textile oils, fungicides, cosmetics, plasticizers, plant growth regulators, lubricant additives and other special chemicals, widely used in light industry, chemical industry, metallurgy, medicine and other industrial products.
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