Jiangsu Shangyong New Material Co., Ltd

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Embodiment of water retention properties of hydroxypropyl methyl cellulose
- Oct 27, 2016 -

Quality hydroxypropyl methyl cellulose can be uniform and effective decentralization in cement and gypsum based products and packages all of the solid particles, and the formation of a wetting film, gradually release the water for quite a long time in the base, hydration with inorganic cementitious materials, so as to ensure the bonding strength and compressive strength of the material.

So, in the construction of high temperatures in summer, for water conservation results, HPMC to be follow the formula enough to add a high quality product, otherwise, it will dry too quickly and cause hydration, insufficient strength, cracking and hollowing and loss of quality, but also increase the difficulty of construction workers. As the temperature falls, water can be gradually reduced amount of HPMC and can achieve the same effect.

Hydroxypropyl methyl cellulose can promote water retention function. Hydroxypropyl methyl cellulose in dry-mixed mortar, a low amount of cellulose ether, but it can significantly improve the performance of the wet mortar, is a main additives influencing the performance of mortar construction. Now, hydroxy propyl methyl cellulose using cellulose ethers are mainly in the dry mortar is hydroxypropyl methyl cellulose (HPMC).

Hydroxypropyl methyl cellulose in dry-mixed mortar HPMC is mainly water, thickening, improve performance, and so on. Hydroxypropyl methyl cellulose HPMC did not participate in any chemical reaction, only play a supporting role. PuTTY powder, on the wall, is a chemical reaction, because there are new substances, PuTTY powder on the wall came down from the wall, ground into a powder, and then, to die, because have formed new substances (calcium carbonate).

Ash powder main ingredients are: Ca (OH) 2, CaO, and a small amount of mixture of CaCO3, CaO+H2O=Ca (OH) 2-Ca (OH) 2+CO2=CaCO3 ↓ +H2O ash calcium in the presence of water and CO2 in the air, produce calcium carbonate, and HPMC just water retention, secondary calcium ash better response, which was not involved in any response.