Dextrins

Dextrins are degradation products obtained by treating starch under carefully controlled conditions. Dextrins are made by heating starch in dry form with small amounts of catalyst. There are two types of Dextrins such as White Dextrin which has an appearance of the native starch and has solubility varying from 25-80%. It forms a soft, light colored gel on cooling. The other one is Yellow Dextrin which ranges in color from pale yellow to dark brown and has high water solubility varying from 85-92%. It is used to produce high solid concentration pastes.

Applications

Chemical & Dyes industry

The advantage of Dextrin in the dyestuff industry is that they wash out quickly and easily and do not react with chemicals used in the process. It is so well recognized that many large-scale manufacturers have started using highly soluble Dextrins as diluents to standardize the dyes with respect to the range of colors.

Textile industry

As Dextrins do not easily react with chemicals, they are specifically suitable for applications in the textile field. In textile printing, they are used as thickners. In sizing, they are used with starch for increased adhesiveness. In finishing, they give desired ‘feel’ and handle to the fabrics.

Paint Industry

Dextrins are largely used in dry distemper. Two to three percent of dextrins, mixed with chalk and pigment, acts as a carrier and imparts good adhesion of the paint to the wall.