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Cellulose ethers are often used as water-retaining agents in (desulfurized) gypsum mortar. Years of research have shown that,water-retaining agent has a very important influence on the gypsum quality and anti-plastering layer performance of plastering gypsum. Good water retention can ensure that the plastering gypsum is fully hydrated, ensure the necessary strength, and improve the rheological properties of the plastering gypsum.
Structural formula
(n2)/2
OR=-OH-OCH3-[OCH2CH(CH3)]nOH or-[OCH2CH(CH3)]OCH3
Modified products
Type
Item
HPMC
YT7
YT-
Specification of non modified products
Type
Item
HPMC
PD/PDS
HPMC
PK/PKS
HEMC
EM/EMS
EM40M
PD40M
PK40M
EM60M
Non surface
PD100M
PK100M
EM70M
treatment
PD150M
PK150M
EM100M
PD200M
PK200M
EM150M
EM200M
Gel temperature
58.064.0
70.090.0
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70.090.0
pH
5.09.0
5.08.0
5.09.0
Loss on drying %
5.0
5.0
5.0
Burning residue %
5.0
5.0
5.0
Bulk density g/L
330400
350420
350420
Methoxy %
23.025.0
19.024.0
19.024.0
Hydroxypropyl %
8.011.0
4.012.0
/
Hydroxyethoxy %
/
/
7.010.0
Applied to gypsum features
1. improve the water retention and processability, and improve the adhesion to the substrate.
2. it is insensitive to the alkalinity of gypsum and can quickly infiltrate in various gypsum products without agglomeration.
3. it has no negative effect on the porosity of the cured gypsum product and ensures the respiratory performance of the gypsum product.
4. it has good retarding effect and does not affect the growth of gypsum crystal.
5. have proper wet adhesion to ensure the bonding ability of the material to the base surface.
6. greatly improve the construction performance of gypsum products, which are easy to spread and do not stick to the knife.
HPMC packaging and storage
Barrel or paper plastic bag lined with polyethylene film inner bag. Net weight of each bag: 25kg.
Protect from sun and rain during storage and transportation.
The Role of HPMC in Enhancing the Performance of Gypsum Plaster Gypsum plaster, a widely used material in construction and sculpture, is valued for its easy workability, fast setting time, and excellent fire resistance. However, traditional gypsum plaster often encounters issues such as cracking, poor water resistance, and reduced adhesion over time. To address these challenges, the inclusion of Hydroxypropyl Methylcellulose (HPMC) has proven to be a game-changer, significantly improving the properties and performance of gypsum plaster. HPMC is a type of cellulose ether that acts as a water-soluble polymer, enhancing the flexibility and bonding strength of various materials. In the context of gypsum plaster, HPMC plays a crucial role in several ways. Firstly, it improves the consistency and workability of the plaster mix, allowing for smoother application and a more uniform finish. This is particularly beneficial for intricate designs or large surface areas where consistent application is essential. Secondly, HPMC enhances the water retention of gypsum plaster. By slowing down the rate at which water evaporates from the mix, it ensures that the chemical reaction between gypsum and water can proceed more effectively. This results in a more complete hydration process, leading to stronger and harder final set products. Additionally, this increased water retention reduces the risk of premature drying and associated cracking, which can compromise the structural integrity and aesthetic appeal of the plasterwork. Moreover, HPMC imparts improved adhesion to the gypsum plaster Moreover, HPMC imparts improved adhesion to the gypsum plasterMoreover, HPMC imparts improved adhesion to the gypsum plaster Moreover, HPMC imparts improved adhesion to the gypsum plaster hpmc for gypsum plaster . It allows the plaster to form a stronger bond with various substrates, including brick, wood, and concrete. This enhanced adhesion prevents delamination and prolongs the lifespan of the plaster by resisting the forces that could lead to peeling or flaking over time. The inclusion of HPMC also offers benefits in terms of water resistance. By modifying the way water interacts with the plaster, HPMC helps to create a more hydrophobic surface that resists water penetration. This is particularly useful in damp environments or when the plaster may come into contact with water, reducing the chances of damage and mold growth. Finally, the use of HPMC in gypsum plaster contributes to an overall greener construction process. As a non-toxic additive that can potentially reduce the need for additional materials or repairs due to its protective qualities, it supports sustainability efforts by minimizing waste and extending the longevity of building components. In conclusion, the integration of HPMC into gypsum plaster formulations addresses many of the material's inherent limitations. By enhancing workability, water retention, adhesion, water resistance, and contributing to more sustainable building practices, HPMC elevates the performance of gypsum plaster. These improvements ensure that gypsum plaster remains a preferred choice for builders, sculptors, and designers who demand both excellence in performance and aesthetics in their work.
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