II. Traditional water retention methods The traditional solution is to pour water onto the base, but this is unlikely to ensure that the base is evenly moistened in the right amount. The ideal hydration target for cement mortar on the substrate is that the hydration products of the cement accompany the process of water absorption
Hydroxypropyl methylcellulose has an important role in mortars, and that is water retention. Mortars with poor water retention are prone to segregation and water loss during transport. When laid on the surface of porous materials, most of the water is easily absorbed and the properties of the mortar are altered. This affects the normal hardening
As the main admixture in construction dry-mix mortar products, hydroxypropyl methyl cellulose plays a key role in the performance and cost of dry-mix mortars. Currently, the majority of cellulose ether products are used in construction materials worldwide. An important property of cellulose ethers is their water retention in construction materials. Without the addition of cellulose
Generally speaking, the higher the viscosity, the better the water retention effect. However, the higher the viscosity, the higher the molecular weight of MC, and its solubility will be reduced accordingly, which has a negative impact on the strength and construction performance of mortar. The higher the viscosity, the more obvious the thickening effect on
For particle size, the finer the particle, the better the water retention. When large particles of cellulose ether come into contact with water, the surface immediately dissolves and forms a gel to wrap the material and prevent water molecules from continuing to penetrate. Sometimes it is not evenly dispersed and dissolved even after long time
HPMC Chinese name hydroxypropyl methyl cellulose, non-ionic, is often used as a water retention agent in dry-mixed mortar, and is the most commonly used water retention material in mortar. HPMC production process is mainly cotton fiber (domestic) through alkylation, etherification and generated a polysaccharide-based ether products. It is not charged itself and does not react
Following the previous article, we continue to introduce HEC and CMC in the classification of cellulose ethers. 1.1.3 Hydroxyethyl cellulose (HEC) It is made from refined cotton treated with alkali and reacted with ethylene oxide as etherizing agent in the presence of acetone. Its substitution degree is generally 1.5~2.0. It has strong hydrophilicity and is
The previous article introduced the mechanism of action of cellulose ethers, and the next article will introduce some basic cellulose ether classifications. 1.1.1 Methyl cellulose (MC) molecular formula \[C6H7O2(OH)3-h(OCH3)n\]x Refined cotton is treated with alkali and made into cellulose ether after a series of reactions with methane chloride as the etherizing agent. The general degree
Water retention agent is the key admixture to improve the water retention performance of dry-mixed mortar, and is also one of the key admixtures to determine the cost of dry-mixed mortar materials, and its main source is cellulose ether. Hydroxypropyl methyl cellulose ether, hydroxypropyl methyl cellulose is a general term for the reaction of alkali
Advantages of HEC application in toothpaste: (1)Combined with CMC, to meet the requirements of modern toothpaste production process, so that the time of wetting, hydration and expansion of adhesive is shorter than in the past, suitable for dry production process. (2) The particle size is less than CMC, and the paste appearance is bright, delicate
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