HPS - Hydroxypropyl Starch Ether
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HPS is a kind of ionic hydroxypropyl starch ether, which is produced by a series of chemical and physical reactions with starch as raw material. It is a kind of non-toxic, tasteless white or beige power, which can be dissolved in cold water to form transparent or translucent viscous liquid. It is effective in thickening, adhesion, dispersion, emulsification, suspension, adsorption, surface activity, water retention and so on.
ETON Hydroxypropyl starch ether is a kind of chemical modified starch mainly used as thickener and texturing agent for cement or gypsum based mortar products. Hydroxypropyl starch ether is used for construction.
ETON HPS is a cost-saving material and is easy to obtain the required thickening. In wet mortars, it offers non-sag, anti-slip properties, good work-ability and low stickiness.
Key properties
1. Rapid thickening ability is available.
2. It is with medium viscosity and high water retention.
3. With a small amount, a little increase can achieve high effect.
4. It can be used together with methyl cellulose ( MC ) and ( HPMC ) to reduce the amount of cellulose ether
5. It can improve the sagging resistance ability to prevent the (sliding) flowing of materials when coated or pasted.
6. Lubrication can improve the operating skills of the material to ensure more smooth operation.
Applications
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Our HPS product has been applied in a variety of building materials, such as tile adhesives, cement/gypsum mortar, and various putty powders (e.g., cement-based, gypsum-based and gray calcium-based putty powder).
Our HPS product is an excellent thickener and water retention agent. With a small dosage, it can effectively increase the slip resistance, improve the workability, and extend the open time of the material.
Shandong ETON New Material Co.,Ltd
The Role of Starch Ether in the Mortar
For example, in the construction of tile adhesive, putty, and plastering mortar, especially now that mechanical spraying requires high fluidity, for example, it is imperative in a gypsum-based mortar (machine sprayed gypsum needs high fluidity but will cause severe sagging. Starch ether can make up for this defect).
Liquidity and sag resistance are often contradictory, and the increase in fluidity will bring about a decline in sag resistance. The mortar with rheological properties can well solve the contradiction that when an external force is applied, the viscosity will decrease, and the workability and pumpability will be enhanced. When the external force is withdrawn, the viscosity will increase and improve the sag resistance.
For the current trend of increasing tile area, adding starch ether can improve the tile adhesive slip resistance.
It can meet the requirements of special tile adhesives for tile adhesives with extended opening hours (Class E, extend from 20min to 30min to reach 0.5MPa).
Starch ether can make the surface of gypsum-based and cement mortar smooth, easy to apply, and has an excellent decorative effect. It is significant for plastering mortars and thin-layer decorative mortars such as putty.
The Mechanism of Action of Starch Ether
When starch ether is dissolved in water, it will be evenly dispersed in the cement mortar system. Because starch ether molecules have a network structure and are negatively charged, they will adsorb positively charged cement particles. As a transition bridge, the cement can be connected to give the slurry a more considerable yield value, improving the anti-sagging or anti-slip effect.