Use of carboxymethyl chitosans as additives in agglomerating compositions

摘要

The present invention belongs to the field of binder compositions for construction, more specifically it relates to the use of carboxymethylchitosan as flocculating additive and setting accelerator in binder compositions of the cement, cement mortar, concrete, grout, stucco and similar type. The invention also relates to binder compositions comprising carboxymethylchitosan, as well as to the method for their preparation.

主权项

1. A method for preparing mortar or concrete comprising
adding a carboxymethylchitosan as a flocculating additive and a setting accelerator to a construction useable binder composition wherein the carboxymethylchitosan has the general formula (I): where: R1 and R2 independently of one another represent H or CH2COOX; R3 and R4 independently of one another represent H, CH2COOX, CH2CH2Y, CH2CH2COOZ, COCH3, or CH(CH3)CH2CH2COOX; X represents a H, Na, Li or K, Y is selected from one of the following groups: Z is selected from H, CH2CH3, Na and K; n represents a number between 35 and 6000; and at least one from among R1, R2, R3 and R4 is a CH2COOX group.