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Hydroxypropyl methylcellulose (HPMC) and hydroxyethyl methylcellulose (HEMC) are widely used building materials, when applied to gypsum-based plastering, it has the following characteristics:
Water Retention: Retains in the mortar, allowing the gypsum to fully set. The higher the viscosity, the higher the water retention, and vice versa;
Sag: Allows workers to create thick coatings without ripples;
Mortar Yield: For a fixed weight of dry mix mortar, ETON products can provide more wet mortar.
Structural formula
(n'2)/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 '
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58.0'64.0
70.0'90.0
70.0'90.0
pH
5.0'9.0
5.0'8.0
5.0'9.0
Loss on drying %
'5.0
'5.0
'5.0
Burning residue %
'5.0
'5.0
'5.0
Bulk density g/L
330'400
350'420
350'420
Methoxy %
23.0'25.0
19.0'24.0
19.0'24.0
Hydroxypropyl %
8.0'11.0
4.0'12.0
/
Hydroxyethoxy %
/
/
7.0'10.0
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 Gypsum Plaster In the world of construction and home improvement, gypsum plaster has been a staple for centuries. It's known for its ease of application, smooth finish, and ability to create fire-resistant surfaces. However, the introduction of Hydroxypropyl Methylcellulose (HPMC) into the formulation of gypsum plasters has revolutionized the industry by enhancing both the process and outcome of plastering projects. HPMC is a type of cellulose ether that serves as a multifunctional additive in gypsum plaster. This synthetic polymer boasts a range of benefits including increased workability, improved adhesion, reduced cracking, and enhanced water retention. These attributes are crucial in modern plastering applications where speed, efficiency, and quality are paramount. When added to gypsum plaster, HPMC acts as a binder and thickener, which allows for a more uniform mixture that adheres better to various surfaces. This ensures a seamless application process, reducing the occurrence of air pockets or uneven coats. Furthermore, the addition of HPMC helps maintain moisture within the plaster, preventing it from drying too quickly and allowing ample time for shaping and finishing. One of the most significant advantages of using HPMC in gypsum plaster is its ability to improve flexibility One of the most significant advantages of using HPMC in gypsum plaster is its ability to improve flexibilityOne of the most significant advantages of using HPMC in gypsum plaster is its ability to improve flexibility One of the most significant advantages of using HPMC in gypsum plaster is its ability to improve flexibility hpmc for gypsum plaster . By reducing the brittleness of the set plaster, it becomes less susceptible to cracking due to natural movements in the building structure or temperature fluctuations. This not only extends the longevity of the plaster but also reduces maintenance costs over time. Moreover, HPMC enhances the fire resistance properties of gypsum plaster. In the event of a fire, the polymer helps form a protective barrier that slows down the spread of flames and heat, providing additional time for occupants to evacuate safely. This feature is particularly important in commercial buildings and high-rise structures where safety standards are stringent. The inclusion of HPMC in gypsum plaster formulations is a testament to the ongoing advancements in the construction industry. By leveraging the unique properties of this cellulose derivative, professionals can achieve superior results with greater confidence and peace of mind. As we continue to seek innovative solutions for building materials, the role of HPMC in gypsum plaster will undoubtedly remain an essential chapter in the evolution of construction practices.
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