SU1047938A1 - Press-mixture for making chip boards - Google Patents

Abstract

PRESS MASS FOR THE MANUFACTURE OF I WOOD PLATE, including wood chips, phenol-formaldehyde resin or urea-formaldehyde resin and an additive, that is, and t. So that, in order to reduce the release of formaldehyde from the finished plates, it contains the chlorophenol compound of the formula CgCl56Na-H o as an additive in the following ratio of components, wt%: Phenol-formaldehyde or urea-formaldehyde resin. 7.5-10.2 Chlorophenol compound of the formula C CljONa-HjO Wood chips

Description

00 00 The invention relates to the production of building materials and molar bpb: mainly used 3 process streams of production of chipboard for housing. Lime press pulp for the manufacture of wood-based plates, including wood particles, phenol-formaldehyde resin and chemical additive (crystalline urea J fl. Known additive does not completely eliminate the release of formaldehyde from wood boards. The closest to the invention is technical essence and achievable The result is a press mass for the manufacture of chipboard, including wood shavings, phenol-formaldehyde or urea-formaldehyde resin, and an additive (ammonia water and ammonium chloride NIN} 2 J. Known chemical additives do not completely eliminate the release of free formaldehyde from finished plates and reduce the formaldehyde release from plates only by 20–40% and at the same time reduce the physicomechanical properties of wood boards. from finished slabs The goal (le is achieved that the press mass for the manufacture of particle boards, including wood strulsku, phenol formaldehyde or urea formaldehyde sm and additive, 3 as an additive contains chlorf nolnoe compound of formula. I am 20 with the following ratio of components, Mac.% S Phenol-formaldehyde1 or poreformaldehyde resin7.5-10.2 Chlorophenol compound0, 9-1.8 Wood chips Rest Implementation of the method of preparing the press mass. Resin and additive are introduced into chip chips. The mixture for 5-10 minutes, mix thoroughly in a paddle mixer. The additive may be introduced by spraying a chip with an aqueous solution or by introducing it into the resin, followed by dissolving it in the latter. Before the introduction, the additive is crushed and sieved through a sieve, having 100 holes per 1 cm. The crushed additive is mixed with the resin solution until the solution is complete, and the mixture is rubbed with the mixture. A carpet is formed from the obtained press mass, it is pressed and a hot pressing of the plates is carried out according to a known technology. When the additive is introduced by the chip spray method, an aqueous solution of the chlorophenol compound of 10-15% concentration is used. The solution is sprayed with chips in a mixer. After that, the chips are dried and resinified in a mixer. A carpet is formed from the obtained press material, it is pressed and a hot pressing of the plates is carried out according to a known technology. CocTaB | it polymer press mass is given in Table. 1. 3 As a phenol-formaldehyde resin, SFZh-3014 resin with a reduced content of formaldehyde is used, and urea-formaldehyde resin is used as a KF-MT resin (GOST 14231-78), which is used in chipboard production on an industrial scale. Sanitary-chemical testing of plates for the formaldehyde use is carried out by photocolorimetric method by reaction with chromotropic acid under conditions simulating the operation of the plates. The physicomechanical tests are carried out according to State Standards 10634-78, 10635-78; 10636-78. For testing, simulate the operating conditions of the plates in various climatic zones of the USSR. In the flooring, in the interior and exterior claddings of the wall panels of residential buildings, the saturation of the required volume of air is in the range of 0.4 (for floors I up to 1 ,, 5 air (in the claddings of panels, Simulation of the conditions of service of plates in different climatic -, their zones are carried out by maintaining a certain temperature in the chamber (the temperature of the test plates operated in the North zone is 2 ° C, and in the Middle zone. Table 2 shows the formaldehyde emission data from particle boards made from press masses, on SF resin Table 3 shows the release of formaldehyde from particle boards made of molding material on KF-MT resin, the physicomechanical indicators of the plates are given in Table 4. Plates made of the well-known press mass with SFI-3014 resin after months after manufacture, they can be used only as a floor covering for residential premises and lisch in the northern zone of the country. Through the same (“the time of the plate, made of the press mass according to the invention, can be used for both floors and panels homes in North and The middle zones of the USSR. After 3 months after the manufacture of the slab, isrotovlenny from the known composition can not be used in residential premises for the skins of houses, in contrast to PL made of glossy press. When using KF-ZT resin, it is possible to lower the formaldehyde content by 9-10 times. Plates made of a press mass according to the invention have a lower content of formaldehyde, a substance harmful to humans. The physicomechanical indicators of the plates made from the proposed press mass have the same meaning as the plates from the press mass not containing the target additive. . Thus, the plates made from the press mass according to the invention are non-toxic to humans and have high physical and mechanical properties. A decrease in the amount of the additive introduced into the press mass increases the toxicity of the plates, and an increase increases the cost and worsens the physicomechanical parameters. The use of the proposed press provides a good sanitary and hygienic environmental conditions in homes. Table 1

Phenol formaldehyde

or urea-formaldehyde resin

Wood chips

Chlorophenol compound

10.2 88.8

1.8

-Table 2

0,008

Oh .007 OD

OD 50

t0, 09

Table 3

0.086

0,005 0,004

0.086 0.051

Table 4

Claims (1)

, PRESS MASS FOR THE PRODUCTION OF WOODEN BIRTH PLATES, including wood shavings, phenol-formaldehyde resin or urea-formaldehyde resin and additive, about t and h and. In addition, in order to reduce the emission of formaldehyde from finished boards, it contains as an additive a chlorophenol compound of the formula CgClgONa · H ^ o in the following ratio, wt.%: Phenol-formaldehyde or urea-formaldehyde resin 7.5-10.2 Chlorophenol compound of the formula C ₆ Cl ₅ ONa-H ₂ O 0.9-1.8 Wood shavings, rest