SU814775A1 - Composition for making fibreboard panels - Google Patents

Description

(54) COMPOSITION FOR THE MANUFACTURE OF WOOD-FIBER PLATES

The invention relates to the production of plates of fibrous material and can be applied in the woodworking industry. A known composition for the manufacture of fiberboard, in which, as a sizing agent, it is recommended to use a paraffin emulsion together with albumin glue flj as a water-resistant fiberboard. Also known is a composition for the manufacture of fibreboard, including pulp, albumin and gach (21 The disadvantages of this composition include poor retention of galevy emulsion on wood fiber when using traditional precipitants (aqueous solution of sulfuric acid, alumina, alum-ammonium alum) and, as As a result, high water absorption and swelling of fibreboard, heavily soiled racks of the casting machine, high content of oil products in the return and waste water. water content of fibreboards and reduction of oil content in circulating water. The goal is that the composition additionally contains a surface-active bleach - a 55% solution of dicyandiamide polycondensate with formaldehyde and urotropin in acetic acid in the following ratio of components on a dry matter by weight ,%: AlbuminO, 3 - 1.5 Gach0.5 - 1.5 55% solution of dicyandiamide polycondensate with formaldehyde and hexamine in an acetic acid medium of 0.5 - 2, O Fibrous mass Residual Physics The khanicheskie indicators of plates, the results of the analysis of the current and inspection of the grids are shown in the table.

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Claims (2)

The results in the table show that the introduction of a 55% aqueous solution of a cicanoantamic polycondensate with formalcegica and hexamine in an acetic acid medium helps to keep the gacha in the plate, since the content of oil products in circulating water decreases significantly; To blend water resistance of wood-fiber plates, which expands the area of their application, and also contributes to the fact that the net of the casting machine does not pollute. Formula of the invention Composition for the manufacture of wood-based panel boards, including pulp, albumin and gach, which is also distinguished by the fact that, in order to improve the quality of fiber (: / fiber boards and reduce the oil content in the circulating water, the composition additionally contains surface-active substance 55% solution of policonence dicyandiamide with formaldehyde and hexamine in acetic acid in the following ratio of components on dry matter wt.%: Albumin 0.3 - 1.5 Gach0.5 - 1.5 55% solution of dicyandiamide polycondensate with formaldehyde and hexamine in acetic acid medium 0.5 - 2, O Fibrous mass Rest Sources of information taken into account during the examination 1.Refin S., P., Mersov E.D., Evdokimov V. G. Fiberboard technology. M., Lesna Industry 1971, p. 63 - 70. 2. Technological recommendations on the application in the manufacture of fibreboard by the wet method of a hydrophobic emulsion on the basis of gacha instead of paraffy (ceresin). Balabanovo, 1977.