SU804513A1 - Wood particle and glue composition - Google Patents

Description

one

The invention relates to wood; manufacturing industry, in particular to the production of wood chipboards.

The known preovesic composition includes wood particles and binder 1.

Closest to the proposed wood-glue composition containing a urea-formaldehyde resin; with hardener and wood particles 2.

The disadvantages of these compositions are low physical and mechanical properties.

The purpose of the invention is to observe the physicomechanical properties of wood. particle board and reduced cure time.

The goal is achieved by the fact that the composition additionally contains a distillation residue from the production of a mixture of isomers of 2,4- and 2,6 -toluene diisocyanate in the following ratio of components, mass, mass:

, Urea-formaldehyde- 5.0-20.0 hydna resin with hardener. Low residue 0.2-6.0

production of a mixture of isomers-2, 4- and 2,6-toluene diisocyanate

Wood particles 90.0-100.0 Urea-formaldehyde resins with hardener can be used as a binder.

As wood material

0 can be sawmill waste, plywood, furniture, woodworking industries, chopped firewood for wood and technological chips according to GOST 15815-70. .

five

As the bottom residue of the production of diisocyanates, a product can be used that is obtained in the production of a mixture of isomers of 2,4- and 2,6-toluene diisocyanate.

0 (TDI) representing the bottoms residue. TDI is obtained after the maximum discharge of the target product in the process of unloading it from the reactor at elevated temperature and in contact 5 with air moisture; it contains the MSO

groups of 5-20 wt.%. It has a mainly three-dimensional structure, is insoluble in organic solvents and pure TDI, does not melt (decomposes at a temperature of 0 above 380 ° C). Example. Obrae1№1 based on wood material (oak), urea-formaldehyde resin (KS-68m with a dry residue content of 65 wt.%.) tearing, which is one of the essential characteristics of the quality of plywood products. The test results are shown in Table. 1. Table Additive VAT residue TDI in the mass. hours per 00 mass.h. the dry residue of urea-formaldehyde resin KS-8 M i L-iiL; °; Strength with uniform tear-off, kgf / cm numerator - strength 1 day after gluing, on the indicator - strength after sticking in water for 3 days. To determine the effect of the bottom residue produced by TDI on the rate of curing of the resin in carbamide Ormal dehydrated resin KS-68 M (00 wt, 4, 20 and 30 wt. determined according to GOST 20501-75 in comparison with resin KS-68 M.

too

the ratio of components, mass. h | Regular

Table 3 1 The test results are given in Table. 2. Table 2 The amount of the cubic residue of the production of TDI in masses. hours based on 100 mass. including the dry residue of urea-formaldehyde resin KS-68 M Cure time, from 52-53 48-49 46-47 Example 3. Samples from wood-adhesive composition are prepared as follows. Aqueous solutions of urea formaldehyde resins with a dry matter content of 50 wt.% Are USED as a binder. The hardener is ammonium chloride (NH4C) in the amount of wt.% By weight of the resin. As shredded wood chips used conifers. The preparation of the composition is carried out in a batch mixer. Then the bag is formed, prepacked and samples were pressed (tozhtsina 20 mm). The test was carried out according to the main indicators GOST 0632-77 for particle boards. Recipes procedural and the proposed composition are given in table. 3, pressing mode is given in tab. 4, the physicomechanical properties of the samples obtained are given in Table. five.

5.0 0.0 20.0 - - - - -10.0 - - 10.0

-, 0 90,0 95,0 100,0 95,0 95,0 95,0 95,0 0,2 2,0 6,02,0 2,0 2,0 Indicators

Pressing temperature, ° С

Pressure of pressob88, 8,710.9 744.5 712.9.709.3 708.4 28.6 -30.6 33.9 30.5 32.7 30.1

0, 63 0.7 0.74 0.73 0.72 0.72

,

..

9.2 11.3 10.8 11.5 12.4 11.9

Continuation of table 3

Table4

Compositions

;: g;

Offered - Regulation 1mentna

170

171

Table

709.6

23.4

0.56

Claims (2)

14.3 As can be seen from the table. 4 and 5, the introduction of the VAT residue of the production of TDI into the wood-adhesive composition contributes to a 17-25% increase in the physicomechanical properties of the products obtained from it, reducing the pressing time. Claims Wood-glue composition containing carbamide-formaldehyde resin with hardened wood particles (characterized in that, in order to improve the physicomechanical properties of chipboard and shorten curing time, the composition additionally contains the residue from the production of 2.4- isomer mixture and 2,6 - toluene diisocyanate in the following ratio of components, masses, including: Urea-formaldehyde - 5,0-20,0 hydrochloric resin with a hardening agent VAT residue 0,2-6,0 produced by a mixture of isomers 2,4 and 2,6 - toluylene otsianata Wood parts - 90.0-100.0 tsi Sources of information taken into account during the examination 1. RZ Temkina Synthetic adhesives in woodworking, M., Lesna industrialism, 1971, pp. 193-195. 2.Shvartsman G.M. Chipboard production. M., Lesna 1977, p. 168 (totype industry).