The difference between hydroxypropyl starch ether HPS and cellulose ether
October 16, 2020
The difference between hydroxypropyl starch ether and cellulose ether and its role in mortar
1. Starch ether can effectively improve the anti-sagging and anti-slip properties of the mortar. However, cellulose ethers usually can only increase the viscosity and water retention of the system, but cannot improve the anti-sagging and anti-slip properties.
2. Thickening and viscosity. Generally, the viscosity of cellulose ether is about tens of thousands, while the viscosity of starch ether is several hundred to several thousand, but this does not mean that starch ether is not as thick as cellulose ether in thickening mortar. The thickening mechanism of the two is different.
3. Compared with cellulose ether, starch ether can significantly increase the initial yield value of tile adhesive, thereby improving its anti-slip performance.
4. Air-entraining. Cellulose ether has strong air-entraining properties, while starch ether has no air-entraining properties.
5. Molecular structure of cellulose ether. Although both starch and cellulose are composed of glucose molecules, their composition is different. The orientation of all glucose molecules in starch is the same, while cellulose is just the opposite. The orientation of each adjacent glucose molecule is more common and commonly used are potato starch, tapioca starch, corn starch, wheat starch, etc. Compared with cereal starches with higher fat and protein content, the starches of root crops such as potato and tapioca starch are more pure.
Starch is a polysaccharide polymer compound composed of glucose. There are two kinds of molecules, linear and branched, called amylose (content about 20%) and amylopectin (content about 80%). To improve the use of starch in building materials