METHOD OF OBTAINING BINDING AGENT FOR FIBRES AND HARDENING BINDER FOR FIBRES Russian patent published in 2014 - IPC C08F8/28 C08L35/06 C08J5/04 C08L29/14 C08L33/14 C08L33/20 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining a binder, used for soaking mineral fibres, in particular glass and basalt fibres, applied in the field of insulation materials. The method of obtaining the polymer binder for soaking fibres contains the following stages: {a} obtaining partially acetalated polyhydroxypolymer, preferably polyvinyl alcohol, preferably with the acetalation degree of 18-22%, with aldehyde, in the presence of an acetalation catalyst, preferably inorganic acid, {b} obtaining a triple copolymer of (b1) vinylaromatic monomer, (b2) compound, containing a carboxyl group, (b3) acryl compound, selected from the group, consisting of isobutylacrylate, isopentylacrylate, pentylacrylate, N-isopropylacrylamide and butylacrylate, taken in a specified molar ratio until viscosity of at least 50 sec, measured by a cup viscosimeter with a nozzle diameter of 8 mm, in accordance with ISO 2431/ASTM D5125, {c} obtaining a copolymer of acrylic acid and acrylnitrile, {d} with the following compound, with mixing, of specified quantities of earlier obtained polymers, with the optional addition of additives into the formed in the said way mixture with further mixing for 30 minutes, the resulting hardening binder represents a water solution and has the colour from reddish-yellowish to reddish-brown and pH in the range of 5-7. The invention relates to the hardening binder, its application, and to the bound fibres.

EFFECT: products from fibreglass, soaked with the binder in accordance with the invention, have after ageing good size stability both in the longitudinal and in the transverse direction, as well as are characterised by good tensile strength stability.

7 cl, 1 tbl, 3 ex