SU1579782A1 - Method of producing wood-particle boards - Google Patents

Abstract

The invention relates to the woodworking industry and can be used in the manufacture of chipboard and fibreboard of the dry production method. The purpose of the invention is to eliminate the bonding of the obtained chipboard during pressing at 200 - 230 ° C and to increase the strength of the boards. For this, polyisocyanate B is applied to wood particles with a moisture content of 6% in an amount of 6% by weight of dry wood. After mixing in the mixer for 5-6 minutes, the carpet is formed in a frame laid on a pallet. The pallet is pretreated with waste from the production of caprolactam after periodic distillation in accordance with TU6-01-7-158-84 at a consumption of 80-120 g / m 2 of surface. After the carpet has been formed, cold pressing is performed at a pressure of 1.0 MPa. The same wastes of caprolactam production in the amount of 80–120 g / m 2 of surface are applied to the pre-pressed carpet with a pneumatic spray. The carpet was placed in a hot press and pressed at 200–230 ° C, pressure 2.8–3.0 MPa for 6 minutes. After 4-5 cycles, a dry continuous protective release layer is formed on the surface of the pallet and the upper press plate. On the 6th cycle, the consumption of antiadhesive is reduced to 40 - 60 g / m 2. Table 1.

Description

The invention relates to the woodworking industry and can be used in the manufacture of chipboard and fiberboard of a dry production method.

The purpose of the invention is to eliminate the bonding of the obtained chipboard during pressing at 200-230 ° C and to increase the strength of the boards.

Example 1. 100 g of polyisocyanate B (6 wt.% Of dry wood) are applied to wood particles with a mass of 1850 g and a moisture content of 6% using a pneumatic spray in a vertical mixer. After mixing in the mixer for 5-6 minutes, the carpet is formed in a frame laid on a pallet pretreated with caprolactam production waste.

after periodic distillation on TU 6-01-7-158-84 at a flow rate of 80 g / m2 of the pallet. After the formation of the carpet, cold prepressing is performed at a pressure of 1.0 MPa and the caprolactam production waste at a rate of 80 g / m2 is applied to the upper surface of the formed and pressed laminated carpet with the help of a pneumatic sprayer. Without a cover, the carpet is placed in a hot press and the hot pressing is performed at a pressure of 2.8-3.0 MPa for 6 minutes. The thickness of the finished plate 20 mm. After pressing, the finished plate is easily separated from the press and the pallet. After cycles on the surface of the pallet and the top plate of the press forms a continuous coating.

On the 6th cycle, the consumption of waste production of caprolactam is reduced to 40 g / m. The plate is easily separated from the metal surfaces. The resulting plates of the first and sixth cycles are tested according to GOST 10632-10637.

The research results are given, the additional cost and labor costs for the processing of plates with caprolactam production waste are shown in the table.

Example2. 100 g of polyisocyanate B (b wt.% Of dry wood) are applied to wood particles weighing 1850 g, moisture 6%. Caprolactam production costs in the amount of 100 g / m After the carpet is formed, the same amount of caprolactam production is sprayed onto the surface (100 g / m2). Without a cover, the carpet is placed in the press and the hot pressing is performed at 215 ° C. The remaining operations, as in Example 1, also reduce the consumption of antiadhesive after the 6th cycle to 50 g / m2

Example Wood particles of the same mass and humidity are applied.

polyisocyanate B in the amount of 100 g

/ 6 wt.% Of dry wood). Waste production of caprolactam in the amount of 120 g / mg is applied to the pallet and the upper surface of the carpet. The remaining operations, as in example 1, except that the pressing is performed at 230 ° C.

.

0

five

and after the 6th cycle, the release agent consumption is 60 g / m2.

PRI me R 4 (prototype). The shavings are treated with polyeiocyanate B in a quantity of 6 wt.% Of dry wood (100 g). The binder is converted into an emulsion using an emulsifier with a special rotor-pulsating unit. In the emulsion in an amount of 10 May. hours at 100 May. g of polyisocyanate (in this example, 0% by weight of polyisocyanate) polyphosphates are introduced, obtained by removing condensation water from a mixture of oleic acidic phosphoric acid salt and dioleic acidic phosphoric acid salt. Form a carpet on the pallet without processing. The formed carpet is covered with a second pallet and placed in a hot press, where pressing is performed at 200 ° C for 6 minutes. The plate after pressing stuck to the pallets. When separating the pallets, the destruction of the surface layer was not less than 10% of the sample area.

Thus, the invention makes it possible to eliminate sticking of the obtained chipboard during pressing at a temperature of 200-230 ° C, to increase the strength of the boards and to reduce the cost of the adhesive.

Claims (1)

Invention Formula A method of manufacturing chipboard, including treating the wood particles with a binder based on polyisocyanates and antiadhesin, forming a carpet on a pallet, cold pressing and hot pressing, characterized in that, in order to eliminate the bonding of the obtained chipboard during pressing at 200 -230 ° C and increasing the strength of the plates, as an anti-adhesive, use caprolactam production waste after periodic distillation, which is applied to the pallet, before the formation of the carpet and on the subpress nny carpet in an amount of 80-120 g / mg dry surface to form a continuous protective layer of release agent on the metal surfaces, contiguous with the carpet, followed by decrease in the release agent consumption to 40-60 g / m2. Damage to the plates during separation from the sample pallets,% of area Strength during static bending, MPa Tensile strength perpendicular to the layer, MPa Binder cost, rub / kg together with anti-agent including emulsified adhesive anti-adhesive 28.4 30.4 31.7 33.0 0.85 2.96 1.0 1.21 1.38 1-70 1-70 1-70 2.13 8.32 0.05 0.05 0.05