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By Lzh | 09 February 2023 | 0 Comments

Why the aqueous solution of HPMC has surface activity?

What is hydroxypropyl methylcellulose?
Hydroxypropyl methylcellulose is mainly used for adhesives and is widely used as an adjunct to oral and local drug preparations. It is also widely used in cosmetics and foods. It is generally believed that hydroxypropyl methylcellulose is a non-toxic and non-irritating material, but excessive oral administration can cause diarrhea. Ordinary intake is harmless to human health, and WHO has no clear regulations on the daily intake of hydroxypropyl methylcellulose. PhEur2002 defines hydroxypropyl methylcellulose as partial O-methylation, Some O - (2-hydroxypropylated) cellulose. Commercially available products have various grades with different viscosity and degrees of substitution. The grade is indicated by adding a number: the apparent viscosity of its 2% aqueous solution at 20 . The unit is mPas. USP 25. Four digits are attached to the common name to indicate the model of the substituent content of hydroxypropyl methylcellulose. For example, hydroxypropyl methylcellulose 1828. The first two digits represent the approximate percentage of methoxy; The last two represent the approximate percentage of hydroxypropyl. The molecular weight is about 10000~150000.
Source and preparation of HPMC
Treat refined cotton cellulose with lye at 35-40 for half an hour, press, crush the cellulose, and properly age it at 35 to make the average polymerization degree of the obtained alkali fiber within the required range. Put the alkali fiber into the etherification kettle, add propylene oxide and methyl chloride in turn, etherify it at 50-80 for 5 hours, and the maximum pressure is about 1.8 MPa. The reaction product is subject to post-treatment (hydrochloric acid neutralization, oxalic acid iron removal, washing, and drying). The raw material consumption quota is 1100kg/t cotton pulp, Chloromethane and propylene oxide 4300kg/t, solid alkali 1200kg/t, hydrochloric acid 30kg/t, oxalic acid 50kg/t.
Application of HPMC
1. Fiber: as a printing dye paste, it can be used for pigments, borax dyes, basic dyes, and textile dyes. In addition, it can be used together with heat-hardening resin in the corrugated processing of kapok
2. Paper: used for gluing and oil-resistant processing of carbon paper
3. Leather: used as a final lubricant or disposable adhesive
4. Water-based ink: added to water-based ink and ink as a thickener and film-forming agent
5. Tobacco: as the adhesive of regenerated tobacco.
Price of hydroxypropyl methyl cellulose
Hydroxypropyl methylcellulose particle size and purity will affect the product's price, and the purchase volume can also affect the cost of hydroxypropyl methylcellulose. A large amount of large amount will be lower. The price of hydroxypropyl methylcellulose can be found on our company's official website.
Hydroxypropyl methyl cellulose supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including hydroxypropyl methylcellulose, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective hydroxypropyl methylcellulose, you are welcome to contact us or inquire at any time.

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