SYNTHETIC FIBRE FOR THREE-DIMENSIONAL REINFORCEMENT OF CEMENT PRODUCT AND METHOD OF PREPARING SAID FIBRE (VERSIONS), CEMENT PRODUCT CONTAINING DISPERSED SYNTHETIC FIBRE AND METHOD OF PREPARING SAID CEMENT PRODUCT Russian patent published in 2010 - IPC D01F8/04 C04B16/06 C08J5/00 

FIELD: chemistry.

SUBSTANCE: invention relates to technology of producing synthetic fibre which can be used for three-dimensional reinforcement of cement products. The fibre is made in form of coaxial core and cladding. The core contains a thermoplastic polymer. The cladding contains either a thermoplastic polymer which is resistant to medium at pH>11 and one or more hydrophilic and/or surface active substances in amount of 3-30% of the total weight of the cladding, or the cladding contains a thermoplastic polymer which is resistant to medium at pH>11, engrafted with active or unsaturated monomers which make up 3-25% of the total weight of the cladding. In both cases, surface tension of the cladding is not less than 45 mN/m. The method making the cladding involves extrusion of molten mass of the basic component of the cladding and the basic component of the core through a concentric draw plate, where during extrusion, hydrophilic and/or surface active substance is added to the molten mass of the cladding. The cement product is obtained from a concrete mixture, mortar or cement paste in which the said fibre is dispersed.

EFFECT: invention enables to obtain fibre with a uniformly hydrophilic surface and high surface tension, good strength properties, which has an effect on strength and longevity of reinforced cement products.

27 cl, 3 tbl, 6 ex