SU982914A1 - Composition for impregnating hard wet-formed fibreboard panels - Google Patents

Description

The impregnation mixture is prepared as follows. Tall oil is heated in the bath of the impregnating machine to 110-120 ° С. The adduct of rosin with melamine in the liquid state at 180–270 s is fed to the bath of an impregnating machine, where it is mixed in the required ratio with tall oil. The impregnation of solid fibreboard impregnating composition is carried out as follows. After drying in a hot press, the plates enter the impregnating machine, where they are treated with the prepared composition at 125-135 ° С. The plates are then heat treated in the bore chamber for 3-4 hours at 150-170. The consumption of the impregnating mixture is 8-9% by weight of the dry plates. Example 1. In order to obtain an impregnating composition, an tall oil heated to 110-120 ° C is introduced into an adduct obtained from 1 weight.h. rosins with 0.05 weight parts. melamine at 180 ° C. The components are taken in the following ratio, wt.%: Tall oil 98.5 Dzdukt rosin with melamine 1.5 In a similar way, formulations containing 0.5 and 2.5 wt.% adobe rosin with melamine are prepared. The plates are impregnated with the prepared compositions at 125135 ° C. Example 2. An adduct obtained from 1 part by weight of rosin with 0.11 part by weight was introduced into tall oil. melamine obtained at 215 ° C. Example 3. An adduct obtained from 1 part by weight of rosin with 0.16 part by weight was introduced into tall oil. melamine obtained at. For impregnation, solid fibreboard with a thickness of 3.0-3.2 mm is used, made at the factory of fiberboard of Alytus EDSK with the following wood composition: softwood 40%, hardwood 60%. In all examples, the impregnated plates are subjected to heat treatment at 160 ° C for 3 hours. Samples are tested according to GFST 19592-74. . . Physico-mechanical parameters of the plates are given in the table.

0.5

1 0.05

1 Rosin 1,5 Melamine 2.5 0.5

1 0.11

2 Rosin

5 Melamine 2.5

0.5

1 0.16

3 Rosin 1,5 Melamine 2.5

Rezinat

zvest1, 5 th manganese

8.2

12.7 8.3 12.9 12.8 8.3 8.4 13.1 8.6 13.5 8.5 13.2 8.4 13.5 8.6 13.9 8.4 13, 6

15.6

The technical and economic efficiency of the invention consists in improving the physicomechanical index of impregnated solid fibreboard, in reducing the cost of superhard fibreboard by reducing the amount of impregnating composition in the slab, in increasing the performance of the impregnating material.

Claims (2)

Invention Formula A composition for impregnating solid wet-fiber fibreboard including tall oil. characterized in that, in order to improve the physical and mechanical properties of the plates, the composition additionally contains an adduct of rosin with melamine in the following ratio of components, wt.% Tall oil 97.5-99.5 Adduct rosin with melamine 0.5-2.5 Information sources, 0 psi expertise taken into account 1, Dmitrieva G.A. Impregnation of solid fiberboard with organic matter. M., VNIIPIEIlesprom, 1972, p. 9, 2. USSR author's certificate 5 589120, class In 27 K 3/52, 1975.