SU854964A1 - Press-mass for producing wood shaving boards - Google Patents

Description

I

The invention relates to building materials and is intended for the manufacture of a material based on chopped wood and an inorganic binder, which are used in construction as, for example, decorative facing, heat and sound insulating and structural plates.

Known press pulp for fire resistant material.

The disadvantage of the material is high density, which creates additional difficulties in the processing of products from such material (cutting, sizing, trimming in place, etc.). In addition, this material has a low water resistance.

A press pulp for making chipboards, is also known. including ground wood, urea resin, phosphate binder, and hydrophobic additive 2.

The disadvantage of the press mass is the low fire resistance of particle boards. In addition, the use of particle boards made from such a press mass in building envelopes (floors, walls, etc.) requires painting, varnishing and other finishing operations, which increases the cost of the material.

The purpose of the invention is to improve the fire resistance and improve the quality of the surface of the plates.

The delivered chain is achieved in that the press mass additionally contains exfoliated vermiculite and a surfactant in the following ratio of components, wt .: Urea resin 15.3-19.5 Phosphate binder 0.1-1.0 Hydrophobic additive 0.5 -1.0 Expanded vermiculite14-18 Surfactant 0.1-0.5 Chopped wood Lead As a phosphate binder, it contains an aqueous solution of acidic phosphate salts Zn, Ak, Cr with a concentration of 10-13%. The concentration of the carpentry resin ration of 54-58% (by dry residue). As a surfactant, it contains sulfite-alcohol bard. Example 1 70% woody lines are mixed with 14% expanded vermiculite, 0.5% of melted paraffin and 15.3% of urea resin (dry residue) with 0.1% sulfite-alcohol stillage and 0.1% of mixture are added to the mixture. acid phosphate salts of aluminum and chromium (13% solution). Mixed for 35 min, the press mass is formed, and then pressed in a hot press at 160-180 ° C and a specific pressure of 20-: 25 kgf / cm П Example 2. 65% of wood chips are mixed with 16% of expanded vermiculite , to the resulting mixture, add 0.7% of melted paraffin and 17.5% of urea resin (dry residue) with 0.3% sulfite-alcohol stillage and 0.5% of a mixture of acidic phosphate salts of aluminum and chromium (13% concentration). Subsequent operations are carried out as in example I. Example 3. 60% wood chips are mixed with 18% of expanded vermi-. 1% molten paraffin and 19.5% carbamide resin (dry residue) with 0.5% sulfite-alcohol stillage and 1.0% mixture of acid phosphoric acids. aluminum and chromium (l3% solution), the subsequent operation is carried out similarly to examples 1 ft 2. Indicators of chipboard made according to the proposed and known methods are shown in the table.

, kg / tf

Density Flexural strength, kgf / cm Weight loss during fire tests according to GOST 17088-71 (4.1),% Fire Resistance Category Evaluation of the quality of the surface of a plate 60-70%. The use of chipboard high fire resistance in the construction of wall panels instead of profiles 705

712

718

750-850 Combustible Requires finishing Hard-burning Does not require finishing metal with insulation provides an economic effect of up to 10 p. on 1 m panel. In addition, the use of particle boards made from such a press mass in building envelopes (floors, walls and dd) does not require painting, varnishing and other finishing operations.

Claims (4)

1. Press pulp for the manufacture of chipboard, including ground wood, urea resin, phosphate binder and hydrophobic additive, characterized in that, in order to improve the fire resistance and improve the quality of the surface of the plates, it additionally contains exfoliated vermiculite and surfactant in the following ratio, wt.%. Urea resin 15.3-19.5 Phosphate binder 0.1-1.0 Hydrophobic additive 0.5-1.0 Expanded vermiculite 14-18 Surfactant, 0.1-0.5 Ground wood Else 2. The press mass according to claim 1, about t l and that with the fact that as of the phosphate binder, it contains an aqueous solution of acid phosphate salts Zn, AlJ C g concentration of 1013%. 3.Press weight on PP. 1 and 2, which is different from the fact that the concentration of the urea-resin is 54-58% (by dry residue). 4.Press weight on PP. 1-3, that is, it contains sulphite-alcohol bard as a strength-active substance. Sources of information taken into account in the examination one . Copyright certificate -SSSR number 331932, cl. At 29 J 5/00, 1970. 2. USSR author's certificate No. 616153, cl. In 29 J 5/00, 1976.