SU1071450A1 - Composition for water-proofing particle-board panels - Google Patents

Description

4L The invention relates to woodworking, in particular, to the production of chipboard for construction, auto-car building. A known composition for the hydrophobicity of particle boards, including water repellents and water SP, The disadvantage of it is to reduce the strength of particle boards. A known composition for the hydrophobization of chipboard, including water-repellent agent, borax, boric acid, organic surfactant and water C21. However, when combined with a bond, the composition does not interact with it, but is distributed throughout the volume, not participating in the process of gluing wood particles, which leads to a decrease in the physical and mechanical coatings of the plates and an increase in the consumption of the binder. The purpose of the invention is to improve the physicomechanical indicators of chipboard and to reduce the binder consumption. The goal is achieved by the fact that the composition of the hydrophobization of chipboard as a water repellent contains fatty synthetic alcohols of the general formula CrtH2rt -4 About the number of carbon atoms, with the following ratio of ETI components, May OH with the number of carbon atoms Q -Cjs30-50 Bura1-10 Boric acid1-15 Organic surfactant2-4 Water 21-66 The hydrophobic composition is prepared as follows. Borax, boric acid and an organic surfactant are first added to the water heated to 80-9 ° C. Then the water-repellent agent. After ten minutes of mixing at a speed of 20-50 rev / s, the composition has a milky-white liquid consistency with a conditional viscosity using a BZ-4 viscometer for 12-15 seconds, for example. A hydrophobic composition is prepared with a different ratio of components, which is combined with synthetic urea formaldehyde resin KF-MT based on: 100 mash., 60% resin 1520 mash. hydrophobic composition, and then sprayed on wood shavings. The plates are pressed gfy 160 C. Recipes hydrophobic composition and its properties are presented in Table. 1 and 2 respectively. Table Fat synthetic alcohols of the general formula (OH WITH NUMBER OF CARBON ATOMS C – C2.5 BORNIC ACID Note: Compatibility with the resin is complete. The physicomechanical characteristics of particle boards made using the compositions shown in Table 1 are listed in Table 3.

Tensile strength

with static

bending, MPa

Tensile strength

when stretched

perpendicular

plate slab, MPa

Water absorption s

24 h,%

Swelling over

24 h,% Thus, the use of the proposed Composition allows to improve the physico-mechanical characteristics of chipboard with a reduction in binder consumption.

27

24

26.5

0.27

0.4

0.48

ten

12

eleven

2.5 In addition, the complete replacement of the deficient paraffin water-repellent agent with fatty synthetic alcohols is carried out, which is waste from the production of synthetic fragrances.

Claims (1)

COMPOSITION FOR HYDROPHOBIZATION OF WOODBACKBOARDS, comprising a water repellent agent, borax, boric acid, an organic surfactant and water, characterized in that, in order to improve the physicomechanical properties of particle boards and reduce the consumption of a binder, the composition contains fatty synthetic alcohols of the general formula ScN _{2n <q} OH with the number of carbon atoms _{—C g5} in the following ratio of components, parts by weight: Fatty synthetic alcohols of the general formula C _p ⁿ 2 θΗ ^{with the} number of carbon atoms C _w ~ ^s 2530-50 Borax1-10 Boric acid 1-15g Organic Surfactant 2-4 Water21-66 SU „1071450