SU1669948A1 - Composition for manufacturing wallboards - Google Patents

Abstract

The invention relates to the preparation of a composition for the manufacture of wood-based panels used as building materials, which makes it possible to increase the strength of the boards and to utilize the waste. For this, the composition contains wt.%: Chopped wood 37 - 44

ash from burning oil shale 18.5 - 21.5

caustic magnesite 18.5 - 21.5 and an aqueous solution of magnesium chloride with a density of 1.22 g / cm ³ 19 - 20. Table 1.

Description

Yo

The invention relates to compositions for the production of wood-based panels used as building materials.

Pel invention - increasing the strength of the plates and disposal of waste,

The composition used Eola of the following composition: SiOz 30,0-35,0; AlfcO, 9.6-12; MgO 2.5-3.5; South 0.5-0.6; KeRP 4.0-4.7; CaO -29-36; 4.5-6.2; Na20 0.1-0.3; S03 8.8-11.2; CO2 1.3-2.2

Example 1 (comparative) Og from shale combustion is mixed in a ball mill with caustic magnesite for 5 minutes, then wood chips are added to them and mixed for another 5 minutes. An aqueous solution of magnesium chloride is added to the mixer and mixed for 10 minutes. the resulting mixture is formed of a mineral chip briquette and a slab is pressed from it. Pressing parameters: temperature 155 ° С, pressure 4 f-ЯТа, time 1.25 min / mm. Plate thickness 16 mm. Caustic magnesite grade PKK-83, wood chips from waste production fraction of 10/1 fraction are used.

The ratio of components, wt0%: chopped wood (chips) 34; ash 23; caustic magnesite 22; Vbdny solution of magnesium chloride with a density of 1.22 g / cm3 (bischofite) 2 K

Finished plates were tested by known methods.

The test results are shown in the table.

Example 2. The ratio of components, chips. 3 /; aeol 21.5; caustic magnesite 21.5; Bishofit 20.0.

ABOUT

oh oh

00 00

Plate making technology is similar to that described in Example 1

Example 3 Ratio of components, maso%: load AO, 0; ash 20, Oj caustic magnesite 20.0; Bishofit 20.0

Plate making technology is similar to that described in Example 1c.

Example 4c The ratio of components, wt.%: Chips 44.0; ash 18.5; caustic magnesite 18.5; Bishofit 19.0 o

Plate making technology is similar to that described in Example 1

Example 5 (comparative) about The ratio of components, wt%,%: chips 46.0; ash 15.0; caustic magnesite 1 /, 0; Bishofit 22,0 „

Plate making technology is similar to that described in Example 1

Example 6 (known composition) Component ratio, chips 44.0; caustic magnesite 32.0; an aqueous solution of magnesium chloride 24,0 „

Plate making technology is similar to that described in Example 1

Test data are given in the table.

The use of ash from burning shale in the composition results in its burning properties, due to the presence of magnesium chloride, and, above all, such compounds as oxides of aluminum, iron, silicon, potassium, calcium.

The use of the proposed composition leads to cheaper raw materials, reducing the consumption of scarce caustic magnesite, increasing the strength properties of the finished product

Claims (1)

Invention Formula A composition for making wood-based panels, including crushed wood, caustic magnesite and an aqueous solution of magnesium chloride with a density of 1.22 g / cm3, characterized in that, in order to increase the strength of the plates and waste, it additionally contains ash from combustible shale at the following the ratio of components, crushed wood 3 / -44; ash from burning oil shale - 18.5-21.5; caustic magnesite - 18.5-21.5; an aqueous solution of magnesium chloride with a density of 1.22 g / cm3 - 19-20,