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There are so many unknowns about the strengthening agent of ceramic body!

2020-09-09 15:04:04

The product range of green body reinforcer is very wide. In a broad sense, any product that can improve the green body strength can be called green body reinforcer. With the difficulty of obtaining high-quality mud increasing year by year, in order to maintain production, ceramic enterprises have to seek low-grade mud. In this case, not only the requirement of superplasticizer is improved, but also the green body reinforcer is applied on a large scale.

The common green body reinforcing agents are bentonite, cellulose series, lignosulfonate and various water-soluble polymers.

1. Bentonite

With the decrease of clay, bentonite has basically entered all ceramic enterprises. With its strength and price, it is favored by various enterprises.

Bentonite has good binding property, and proper addition can improve the strength of green body. At present, the inorganic green bodies in the market are generally bentonite, natural or artificial bentonite.

There are many kinds of bentonite, such as sodium bentonite and calcium bentonite. The composition of bentonite is very much, from the aluminum content of 12 points to 20 points, or even wider. The bentonite used as green body reinforcing agent is generally sodium bentonite. Calcium based bentonite is relatively easy to cause adverse effects on gel release. Because of its fine particle size, the dosage of Pengrun soil should be paid attention to. If the dosage is too high, it is easy to cause the green body drying and cracking due to excessive shrinkage.

2. Lignin

Lignin is a by-product of paper mill, which is extracted from the waste liquid in the pulping process. The fiber bundle and lignin are extracted from the paper industry, and the remaining half fiber and lignin remain in the waste liquid. Lignin can be divided into alkali lignin and lignosulfonate according to different raw materials.

The preparation process of alkali lignin is as follows: the wood and NaOH solution are heated and cooked, and the lignin in the wood forms alkali lignin and sulfurized lignin, which are dissolved in alkali liquor. After the pulp is washed and cellulose is analyzed, the lignin enters into the waste liquor, which is also called black liquor because of its black color.

Alkali lignin and sulfur lignin were separated by chemical precipitation and then recovered. In the process of using, the effect of alkali lignin is general. At the same time, due to the high content of sulfur and phosphorus, it is easy to volatilize in the process of ball milling, and the smell is relatively large when the pulp is produced. Relatively speaking, it has a greater impact on the working environment of ball milling.

Under the current pressure of environmental protection, many paper companies begin to pay attention to the use of black liquor, and many large paper enterprises and universities jointly develop the use of black liquor in the field of building ceramics. The prospect of alkali lignin is worthy of attention.

Lignosulfonate. The preparation of calcium lignosulfonate comes from acid pulping. Acid sulfite containing calcium sulfite, magnesium sulfite, sodium sulfite or ammonium sulfite is heated with wood, and lignin is sulfonated to form water-soluble lignosulfonate. Because it is red, it becomes red liquid. The strengthening effect of lignosulfonate is better than that of alkali lignin.

3. Water soluble polymer

The common water-soluble polymers are polyacrylamide, polyvinyl alcohol, polyacrylate, starch, acorn tannin extract, Arabic gum and so on. Liquid enhancer is generally dissolved in advance, and then added to the ball mill.

It is worth noting that if we want to make full use of water-soluble polymers, we must understand the number of carbon chains and their branched chains, as well as the functional groups of the polymers, in order to be able to use them well. Some polymers can not be ball milled, and the molecular chain is easy to break at the temperature, which can not play the role of reinforcement. If the molecular chain is too long, it will lead to the black center phenomenon in the process of sintering, because the temperature is too high, it can not effectively burn completely.

Relatively speaking, the effect of inorganic enhancer is relatively good, and its effect on degumming is relatively limited. In order to avoid defects, the molecular weight and carbon chain branch of organic enhancer should be modified properly. At the same time, it is necessary to pay attention to the effect of organic enhancer on mud degumming.

Foshan super speed Chemical Co., Ltd. was established in 2007, The company is located in the big Toyota Industrial Zone of Wuzhuang, Luocun, with convenient transportation, 1.5km away from the first ring of Foshan. It is specialized in R & D, production and sales of ceramic superplasticizer, diluent, degumming agent, sodium metasilicate jiushui, sodium metasilicate pentahydrate, sodium metasilicate zero water, compound trimer, liquid dispersing agent, green body strengthening agent, green body whitening agent, and other ceramic additives for the whole line. The product quality and quality are very high Sales in Foshan ceramic thinner industry leading position, with a number of large domestic brand ceramic enterprises to maintain long-term cooperative relations, products are exported to Southeast Asia, the Middle East and other regions.


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