SU889674A1 - Composition for hydrophobization of wood particle boards - Google Patents

Description

I

The invention relates to the woodworking industry and can be used in the production of particleboard of higher resistance to water.

Known to hydrophobize plates l

However, the use of such a composition does not provide high water resistance chipboard.

The composition of the hydrophobization of wood chipboards is known, which includes, as a hydrophobic additive, a gach, a self-contained meat and water 2 J.

This composition also does not provide high hydrophobic properties and increase the strength of the plates.

The aim of the invention is to improve the water-resistant performance of plates with prolonged exposure to water.

The goal is achieved by the fact that the hydrophobic additive additionally contains an ethanol-insoluble fraction of the resinous part of crude peat wax in the following ratio of components,% by weight:

Gach 13.2-15,6 Economic

soap 1,5-2,0

The resinous fraction is insoluble in ethanol.

parts of it.

peat wax 8.4-10.8WaterOther

The ethanol-insoluble fraction of the resinous part of crude peat wax is a waste product from the sterol peat resin for the perfume industry.

Characteristics of the fraction insoluble in ethanol of the resinous part of the crude peat wax :, temperature drop 49 ° C; viscosity at 95 ° C; 191.4 cps. Its structure includes t, May.%: Wax 9.4; paraffins 64.3 and resin 26.3. Example 1. 45 g of water are heated to 90-95 ° C. During mixing, without causing a strong foaming, 1.5 g of household soap, previously soaked in 20.5 g of water having a temperature of 3035 ° C, is introduced. 13.2 g of gacha and 10.8 g of the insoluble in ethanol, a fraction of the resinous part of peat wax, are melted together. Make the melt with stirring in an aqueous solution-emulsifier having a temperature of 85-90 C. Emulsification is carried out. 5 minutes. Then the composition is cooled to 25-30 ° C 5 minutes

Example 2. The preparation of the composition is carried out according to example 1, changing only the ratio of components, g: water 74.2; economic mto 1,8; Gach 14.4; the fraction of the resinous part of crude peat wax 9.6 is not soluble in ethanol.

Example 3. The preparation of the composition is carried out according to example 1, changing only the ratio of components, p of water 74; household soap 2.0; Gach 15.6 is not soluble in ethanol fraction of the resinous part of crude peat wax 8.4.

Physico-chemical characteristics of the compositions are presented in table 1.

As follows from the data of table 1, the composition is highly resistant

and helps reduce the curing time of the binder,

With the use of these compounds are manufactured chipboard. 5% of the compositions are injected into a completely dry blast together with a binder. The binder content is 14% dry on the outer layer and 10% on the inner layer.

The indicators of the physicochemical properties of the plates are presented in Table 2 ..

In the known and proposed formulations, the density is 740 kg / m; The tensile strength at stretching perpendicular to the plates of the plate is 0.44 MPa.

Thus, the use of the proposed composition makes it possible to reduce compared to the known water-absorbing plates for 24 hours by 1.27-1.4 times and increase the efficiency of the composition with the long-term effect of water on the plates. Plates that are hydrophobic with a composition have more low water absorption and swelling after being in water for 30 days.

The strength of pieces when using the proposed composition increases slightly,

Table 1

Humidity,%

Strength at static bend, Sha

5.6

5.1

5.3

24.6 24.3

25.1

Claims (2)

1. USSR author's certificate No. 585063, cl. In 27 K 3/52, 1976. 2. Copyright Certificate CCCl: 40 according to application number 2680072 / 29-15, cl. C 08 L 97/02, 1979.