What is hydroxypropyl starch ether used for?

Differences between HPS and HPMC

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HPS (short for hydroxypropyl starch ether) is unfamiliar to many people, and thought to be a little different from common starch, but that’s not the case. HPS has a very small amount used in mortar products, and a very low addition amount enables to achieve very good quality effects.

HPS is a white fine powder free from plasticizers, prepared from natural plants, which are modified, highly etherified, and spray dried. It is totally different from common or modified starch.

 

Hydroxypropyl methyl cellulose (HPMC for short), also known as hypromellose or hydroxypropyl methyl cellulose ether, is prepared from selection of highly pure cotton cellulose, treated in 35-40℃ alkali liquor for 0.5h, squeezed to smash cellulose, and properly aged at 35℃ to make average polymerization degree of alkali fiberobtained within the required range. Put alkali fiber into the reaction kettle, then add propylene oxide and methyl chloride in order for 5h etherification at 50-80℃, with the maximum pressure of 1.8MP. Afterwards, add an appropriate amount of hydrochloric acid and oxalic acid into 90℃ hot water for washing the materials and expanding the volume. Then use the centrifugal machine for dehydration and finally become neutral with repeated washings. It is widely used in building, chemical, coatings, pharmaceutical and military industries, respectively as a film former, binder, dispersant, stabilizer and thickener.

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HPMC can be used as an admixture of cement-based, gypsum-based and ash-calcium products, having good compatibility with other admixtures in building. Its use in conjunction with HPMC enables to reduce the amount of HPMC (usually an amount of 0.05% HPS added can reduce by about 20%-30% of HPMC’s amount), play thickening roles, promote the inner structure, possess better crack resistance and improve workability.

Hydroxypropyl Starch Ether

SE-301

 

Hydroxypropyl Starch Ether can impart unique properties to cement and gypsum based products. It has the similar chemical structure with Hydroxypropyl Methylcellulose(HPMC) that not only provide Hydroxypropyl Methylcellulose(HPMC)-like function, but also has good compatibility with other building additives. In combination with Hydroxypropyl Methylcellulose(HPMC), Hydroxypropyl Starch Ether can play a better thickening effect, with better crack resistance and improve workability. And by adding starch ether, the cost of the mortar formulation can be significantly reduced.

Item Standard Appearance White to yellow powder Moisture ≤10% pH 7.0~9.0（5% solution） Viscosity 500-1200mPa.s (5% solution) Solubility Soluble in water

The properties of starch ether in dry mortar are as follows:

1. Due to the special chemical structure of starch ether, Hydroxypropyl Starch Ether can effectively prevent the hanging phenomenon of thick layer of mortar, which has a good improvement effect on the sliding of the tile, the hanging of thick layer and other undesirable phenomenon;
2. Adding appropriate amount of Hydroxypropyl Starch Ether in the mortar can delay the opening time of it. The water retention of starch ether can be kept stable with the increase of temperature. Therefore, the product can not only improve the water retention performance of the mortar, but also compensate the rapid retention of the water retention capacity of the ordinary water retention agent with the increase of the temperature;
3. Hydroxypropyl Starch Ether has a fast thickening function for mortar, which can improve the rheology of spray mortar and plaster mortar;
4. Hydroxypropyl Starch Ether can effectively prevent the stratification/segregation of the mortar, which can be well used in self-leveling mortar;

Hydroxypropyl starch ethers are added in the following materials:

1. Inner and outer wall putty powder of various types(cement, gypsum base);
2. Various types of(tile, stone) binders;
3. All kinds of facing mortar and plaster mortar, especially the exterior wall insulation mortar.

The starch ether produced by Sidley Chemical can replace of AVEBE starch ether CASUCOL 301, it has excellent performance in mortar and can greatly reduce the cost.

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