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HPMC Effectively Improve The Slurry
Oct 12, 2017

HPMC Effectively improve the slurry

Relationship between water retention and temperature of hydroxypropylmethylcellulose

Hydroxypropyl methyl cellulose HPMC water retention effect and principle:

Cellulose ether HPMC in the cement mortar and gypsum-based slurry, mainly from the role of water retention and thickening, can effectively improve the pulp adhesion and anti-dullness.

Air temperature, temperature and wind pressure and other factors will affect the cement mortar and gypsum-based products in the evaporation rate of water. So in different seasons, add the same amount of HPMC product water retention effect there are some differences. In the specific construction can increase or decrease the amount of HPMC, adjust the water retention effect of the slurry. Methyl cellulose ether under high temperature water retention, is an important indicator of the quality of methyl cellulose ether. Excellent HPMC series of products can effectively solve the problem of water retention at high temperatures. In the hot season, especially in hot and dry areas and Xiangyang side of the thin layer of construction, the need for high-quality HPMC to improve the water retention of the slurry. High-quality HPMCs are very homogeneous, and their methoxy and hydroxypropoxy groups are evenly distributed along the cellulose chain to improve the ability of hydroxyl groups and ether bonds to form hydrogen bonds with water , So that free water into a combination of water, so as to effectively control the evaporation of water caused by high temperature weather, to achieve high water retention.

High-quality cellulose HPMC can be uniformly and effectively dispersed in the cement mortar and gypsum-based products, and wrapped all the solid particles, and the formation of a layer of wetting film, the water in the base for a long time to gradually release, and inorganic glue Coagulation material hydration reaction, so as to ensure the bonding strength of materials and compressive strength. Therefore, in the high temperature summer construction, in order to achieve water retention effect, according to the formula enough to add high-quality HPMC products, otherwise, there will be too fast drying caused by insufficient hydration, reduced strength, cracking, hollowing and shedding quality Problem, but also increase the difficulty of construction workers. And with the temperature drop, you can gradually increase the amount of HPMC added, and can achieve the same water retention effect.

The water retention of the hydroxypropylmethylcellulose HPMC product itself is affected by the temperature and the following factors:

1. Cellulose ether HPMC homogeneity

Homogeneous reaction of HPMC, methoxy, hydroxypropoxy even distribution, high water retention.

2. Cellulose ether HPMC thermogel temperature

Hot gel temperature is high, high water retention rate; the other hand, the water retention rate is low.

3. Cellulose ether HPMC viscosity

When the viscosity of HPMC increases, the water retention rate also increases; when the viscosity reaches a certain degree, the rate of increase in water retention tends to be gentle.

4. Cellulose ether HPMC added

The higher the amount of cellulose ether HPMC added, the higher the water retention rate, the better the water retention effect. In the range of 0.25-0.6%, the water retention rate increased with the increase of the adding amount. When the adding amount increased further, the increasing trend of water retention rate slowed down.