What role does cellulose ether play in dry-mixed mortar?

Cellulose ether is a synthetic polymer made from natural cellulose through chemical modification. Cellulose ether is a derivative of natural cellulose. The production of cellulose ether is different from synthetic polymers. Its most basic material is cellulose, a natural polymer compound. Due to the particularity of the natural cellulose structure, the cellulose itself has no ability to react with etherification agents. However, after the treatment of the swelling agent, the strong hydrogen bonds between the molecular chains and the chains are destroyed, and the active release of the hydroxyl group becomes a reactive alkali cellulose. Obtain cellulose ether.

The properties of cellulose ethers depend on the type, number and distribution of substituents. The classification of cellulose ethers is also based on the type of substituents, degree of etherification, solubility and related application properties. According to the type of substituents on the molecular chain, it can be divided into monoether and mixed ether. We usually use mc as monoether, and HPmc as mixed ether. Methyl cellulose ether mc is the product after the hydroxyl group on the glucose unit of natural cellulose is substituted by methoxy group. It is a product obtained by substituting a part of the hydroxyl group on the unit with a methoxy group and another part with a hydroxypropyl group. The structural formula is [C6H7O2(OH)3-m-n(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethyl methyl cellulose ether HEmc, these are the main varieties widely used and sold in the market.

In terms of solubility, it can be divided into ionic and non-ionic. Water-soluble non-ionic cellulose ethers are mainly composed of two series of alkyl ethers and hydroxyalkyl ethers. Ionic Cmc is mainly used in synthetic detergents, textile printing and dyeing, food and oil exploration. Non-ionic mc, HPmc, HEmc, etc. are mainly used in construction materials, latex coatings, medicine, daily chemicals, etc. Used as thickener, water retaining agent, stabilizer, dispersant and film forming agent.

Post time: Nov-24-2022