FIELD: chemistry.
SUBSTANCE: invention relates to a water-soluble resin composition, a method of producing such a resin composition, use of the resin composition as binding material for non-woven fibre material, particularly insulation materials, and a method of producing such insulation material. The water-soluble resin composition contains a resin which is a product of reaction of aldehyde, preferably selected from a group including formaldehyde and (lower alkyl (C1-C4)) mono- or di-aldehydes or formaldehyde precursors, which can form formaldehyde directly in the resin composition, and a hydroxyl-aromatic compound selected from a group including substituted and unsubstituted mono- or polycyclic phenols, preferably from phenol, said composition further containing: an amino compound containing 2-6 amino groups, which is selected from a group comprising urea, dicyandiamide and melamine, and where the amino compound can also be a mixture of two or more different amino compounds; and a sugar alcohol. The resin has initial molar ratio of aldehyde to the hydroxyl-aromatic compound from 2.3 to 5.5; the ratio of the resin to the amino compound plus the sugar alcohol ranges from 45:55 to 70:30 pts.wt; the ratio of the amino compound to the resin lies between 20:80 and 50:50 pts.wt; and the ratio of the sugar alcohol to the resin plus the amino compound lies between 5:95 and 30:70 pts.wt. The sugar alcohol has a boiling point higher than the setting point of the resin.
EFFECT: obtaining a resin composition having well preserved water-solubility and without ammonia, reduced phenol and formaldehyde emissions during hardening and preservation of mechanical properties of the hardened resin, particularly wet strength.
16 cl, 2 tbl, 6 ex
