Gypsum Special Grade HPMC

Hydroxypropyl methyl cellulose (HPMC) is a non-ionic cellulose ether
obtained by cellulose alkalization, etherification, neutralization and
washing.
HaoShuo HPMC has good thickening, dispersing, emulsifying, film-forming
properties, etc. It is the first choice for production of high quality
building materials additives.
Properties of Gypsum Special Grade HPMC
To meet the needs of environmental protection, Our product with high water
retention, dispersion, good fineness, good work ability, easy dissolution
characteristics. It is widely used in building base materials.It has good
water retention and improve the workability. It can also prolong the open
time and improve sag resistence.
Plaster plaster, bonding plaster, caulking plaster
Plaster materials are divided into whitewashed plaster, bonding plaster, and
caulking plaster. Gypsum products have various different features. In
addition to gypsum and related fillers, the key issue is that the added
cellulose ether additives play a leading role. Since gypsum is divided into
hydrated gypsum, anhydrous gypsum and semi-hydrated gypsum, different gypsum
has different effects on the performance of the product, so thickening,
water retention, and retardation determine the quality of gypsum building
materials. The common problem of these materials is hollowing and cracking,
and the initial strength cannot be reached. To solve this problem, it is to
choose the type of cellulose and the compound utilization method of
retarder. In this regard, hydroxypropyl methyl 30000-60000cps is generally
selected, and the addition amount is between 1.5%-2%. It is water retention,
retardation and lubrication. Notice to choose HPMC with high water
retention.
HPMC water retention mechanism
HPMC is a polymer material with a three-dimensional network structure. There
are many hydroxyl groups on the cross-linked network structure. The hydroxyl
groups are hydrophilic groups. When it comes into contact with water, the
hydrophilic groups will interact with water molecules. Combines into
hydrogen bonds and absorbs large amounts of water through chemical
adsorption.
The role of HPMC in gypsum products
Shrinkage resistance, hollow resistance and crack resistance
Good sag resistance
Good workability
Good water retention
Environmental protection

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