Progress and research progress of printing thickening agent

Inorganic thickener

Inorganic thickeners include inorganic salt thickeners and inorganic gel mineral thickeners. Inorganic salt thickened agents mainly include sodium chloride, potassium chloride, ammonium chloride, etc. When surfactants form rubber beams in the aqueous solution, the presence of this type of electrolyte will increase System viscosity, so it is often used as a thickest of the water -solution system of surfactants. However, too much inorganic thickening agent will cause the "salt analysis effect", so it is generally reproduced with other thickeners. Inorganic gel mineral thickeners mainly include puffed soil, aluminum silicate and other gel minerals. These minerals generally have laminar or expanded grid structures. Through the effect of chip crystal charge and hydro -inflation to achieve thickening effect. Although inorganic gel mineral thickeners have good thickening effects, there are problems such as poor water retention and poor flowing levels during use.

Natural organic polymer thickener

There are many varieties of natural organic polymer thickeners, mainly including sodium alginate, cellulose, natural glue, starch and its transsexual products. Among them, sodium alginate is a type of natural organic polymer compounds extracted from kelp and ponyto. Because the molecular structure contains carboxyl groups, it can form sodium carboxylic acid salt with alkali and dissolve in water. Since the advent of self -active dyes, sodium algina at home and abroad has been used as a thickest dealer of active dyes. Because sodium alginate and negative electrical active dyes are scolding, chemical effects will not occur during use. Therefore Become an ideal thickener for active dye printing. When the sodium alginate is printed, the fabric has a high amount of color and good lumping. The slurry attached to the screen when printing is easy to wash. However, there are also some problems during use. For example, in order to print fine flower types, sodium alginate is used in flat and round net prints with high numbers. Generally, the outline of printing is not clear, and the printing effect is not ideal. In order to achieve a better printing effect, it is currently actively developing alternative sodium alginate at home and abroad, such as carboxymethyl cellulose, transgender starch, etc. Although these products are better than sodium algina, they still cannot satisfy the printed color paste paste Comprehensive performance requirements.

During the use of cellulose thicker, due to the strong hydrochtic effect between the hydrophobic chain segment on the molecular chain and the surrounding water molecules, the molecular chain is wrapped in each other, the polymer itself increases, the particle volume of the polymer itself, the granules are free of granules, the granules are free The space for activity decreases and the system viscosity increases. Cellulose thickener has a high thickening efficiency and is not sensitive to the pH value and electrolytes of the solution, but there are also some disadvantages, such as poor flowing and stability. It often needs to be added with an additional mildew to prevent mildew.

Polyacrynal thickener

Polyphonal thickened agent is quite sensitive to electrolytes and poor electrolyte resistance. The research on polyacrylate thickeners abroad was carried out earlier. In 1953, COODRICH developed the first carbomer934 that was completely synthesized by artificial synthesis. In addition, foreign thickeners have been used for coatings in the 1970s, and the research work of synthetic thickened agents in China has only begun to synthesize the integrated thickener developed in my country at this time. KG -401C, the synthetic thickener PF developed by the Shenyang Institute of Chemical Engineering, has problems such as poor electrolyte resistance and high color amount when printing, and the thickening effect is not ideal. In recent years, some researchers have also carried out research on improving salt resistance to improving polyacrylate thickeners.

Water -based polyurethane thickener

Water -based polyurethane thickener is a hydrophobic group modified sorted polyurethane hydraulic polymer. It belongs to a non -ion -connected thickener and is a newly developed environment -friendly thickener in recent years. The molecular structure of its three -in -segment is mainly composed of three parts of hydrophilic groups, hydrophobic groups, and amino componan acetate groups connecting hydrophobic and hydrophilic groups. The hydrophobic chain segment at both ends of the main chain is generally long carbon chain alkyl alcohol. The hydrophilic chain segment in the middle is generally polyether polyol. The amino -based amino -based amino -based amino -based amino -based on polyether polyol alcohol connects the hydrophilic Chain segment and hydrophobic chain segment. Due to the good electrolyte resistance of water -based polyurethane thickened agent, the changes in the pH value are relatively stable, and the film formation is good. Therefore, the application is becoming wider and more attention.