ZUBEREITUNGEN AUS NICHT-IONISCHEN UND IONISCHEN HYDROKOLLOIDEN UND DEREN VERWENDUNG ALS HILFSMITTEL FÜR DEN TUNNELBAU

摘要

Prepn. comprises a non-ionic hydrocolloid, esp. polysaccharide ether, pref. cellulose ether, and at least an ionic hydrocolloid, esp. polysaccharide ether, pref. cellulose ether, and at least one surface active material. Also claimed is a prepn. comprising the above materials and an unrefined natural polysaccharide. Pref. the non-ionic hydrocolloid is a polysaccharide ether, pref. alkyl cellulose, alkyl hydroxyalkyl cellulose, hydroxyl alkyl cellulose or (hydroxy) alkylated ether starch. The ionic hydrocolloid is a carboxyalkyl or carboxylalkylhydroxyalkyl cellulose ether or carboxy(alkylhydroxy)alkylated ether starch. The surface active component is an anionic, cationic non-ionic or ampho-tenside. The unrefined natural polysaccharide is made of xanthan, starch, guar, natural rubber, ground locust bean, traganth, tamarind, alginate, protein, esp. cellulose material such as pine wood-sulphate, surface and cellulosic wood material.