Application of hydroxyethyl cellulose in daily chemical products

Daily products: HEC is effective in shampoos, hair sprays, neutrals, hair conditioners and cosmetics

Film agents, adhesives, thickeners, stabilizers and dispersants; In washing powder is a kind of dirt reprecipitation agent; The dissolution of HEC at high temperature can accelerate the production process and improve the production efficiency. The obvious characteristic of HEC containing detergent is to improve the smoothness and mercerization of the fabric. 5. Paper making and ink chemical industry: HEC is used as the adhesive for paper and paperboard, as well as the thickening and suspension of water-based ink; In the process of paper making, HEC's superior performance includes compatibility with most of tree gum, resin and inorganic salt, low foam, low oxygen consumption and the formation of smooth surface film, which has low surface permeability and strong gloss; HEC coated paper for high quality printing; In water-based ink manufacturing

1 molecular structure

Cellulose ether products are formed by the reaction of hydroxyl of glucose anhydride unit on cellulose chain with etherification group. The etherifying group of CMC is vinyl chloride sodium, and the etherifying group of HEC is ethylene oxide. CMC and HEC

The degree of polymerization of molecular structures is generally greater than 600. The DS of carboxymethylcellulose sodium (CMC) is the average number of moles of sodium added to a glucose anhydride unit, and the MS of hydroxyethyl cellulose (HEC) is the average number of moles of epoxy ethylene added to a glucose anhydride unit. Products of CMC or HEC with different degree of polymerization and different DS or MS can be obtained by selecting molecular substitution, reaction conditions and uniform control of substitution.

At present, the market of CMC DS are 0.7, 0.9, 0.7 and 0.9, CMC is probably one of the following several kinds of viscosity of different DS specification: 50000 mpa, s, and 30000 mpa, s, and 30000 pa, s (2% aqueous solution, 25 ℃, Broofield viscometer), etc.

HEC product at the time of MS 2.5 in water-soluble, the viscosity of the common specifications: 100000 mPa, s, and 50000 mPa, s, and 50000 mPa, s, 15000 mPa, s, and 6000 mPa, s, and 6000 mPa, s and 15 mPa, s (2% aqueous solution, 25 ℃, Broofield viscometer).

4 application examples

CMC and HEC have been widely used in daily chemical products that require adhesion to form a stable emulsion system, such as toothpaste, body wash, hand sanitizer, skin cream, shampoo and glycerin, shoe oil and detergent.

4.1 the toothpaste

CMC has always been one of the important raw materials of toothpaste manufacturing. Its function is to mix the liquid and solid raw materials of toothpaste evenly, and to endow the shaping flow and proper viscosity as well as certain brightness and delicacy of toothpaste.

CMC adhesive can be used for common type toothpaste without special efficacy additives. However, CMC of anions is sensitive to high concentration of ions, which can reduce CMC adhesion performance. CMC is of high quality. Special efficacy toothpaste is limited. The non-ionic HEC is used as the adhesive, which enhances the performance of the adhesive against high concentration of ions, greatly improves the storage stability of the paste and extends the storage time of toothpaste. The toothpaste manufacturer can use CMC ~ HEC in the high-salt toothpaste, so the cost of the product does not change much. CMC is used in toothpaste for DS = 0.9 ~ 1.0, viscosity specifications for 6500 mPa, s, HEC viscosity specifications for 6000 mPa, s (2% aqueous solution, 25 ℃, Broofield viscometer).