SU697346A1 - Composition for making wood articles - Google Patents

Description

one

The invention relates to the woodworking industry, to the production of structural materials, namely, wood press composition.

The known wood press composition containing ground wood, -phenol-formaldehyde resin, ammonia fire retardant, chalcium oxide and the wood press composition containing ground wood, phenol-formaldehyde resin, urotropin 2, is closest to the proposed one.

The known press composition has low chemical resistance and dielectric properties, has a fluidity, which hinders its use for the manufacture of ribbons of belt conveyors for the chemical industry and the production of mineral fertilizers.

In order to increase the chemical resistance, the wood compressed wood composition, which includes crushed wood, phenol-formaldehyde resin, hexamine, additionally contains rubber, sulfur, zinc oxide in the following ratio of components, Bec., J | J ,;

Ground wood 73,8-71,3 Phenol-formaldehyde resin (dry residue). 16-20 Rubber 4-8 Sulfur .1.6-3.5 Urotropin 0.1-0.2 Zinc oxide 0.5-1

The wood press composition is a material obtained by hot pressing crushed wood (sawdust, crushed material, chips) impregnated with a solution of rubber in gasoline and then polycondensed resins, such as phenol formaldehyde resin. Phenol-formaldehyde resin, in addition to the polycondensation reaction, is involved in the process of vulcanization of rubber, and No.e together with sulfur performs the cross-linking of rubber molecules:

+ NASH Y See.

iHpOH

fin.

enz

g

c riH-lHf L

with not him

C, -urotropin plays the role of a hardener of phenol-formaldehyde resin, as well as the organic accelerator of the vulcanization process and rubber, and zinc oxide, the activator of this process. The resulting material has the physico-mechanical and technological properties given in table. 2. An example. To obtain wood chemical resistant press compositions 1-5, the number of components indicated in Table 2 was taken. 1 (wt.%). Physical, mechanical and technological properties of these compositions are given in Table. 3. The chemical resistance of the material, in addition to laboratory tests, was tested in roller-conveyors of belt conveyors at the Gomel Chemical Plant and the Belarusian Potash Plant. Rollers with a diameter of 108 mm and a length of 240 and 310 mm were made of woody chemical resistant press composition of the following composition, wt.%: Chopped wood 71.3; phenol form ;: liquid resin 18.0; SKS-30 ARKP 7.5 rubbers; sulfur technical 2,3; ypot ropita 0.15; iijiHKa oxides 0.75. The rollers were operated in atressive-abrasive environments during the transportation of potassium salts, phosphogaps, ammophos and double superphosphate. As shown by the test videos

Ground wood Phenol-formaldehyde resin (dry residue) Sulfur

Urotropin Zinc Oxide

70.7

71.3

71.3 fiH-dHsC-r-H% from the proposed material have a sufficiently high chemical resistance and durability. As laboratory and field tests have shown, wood squeeze is a copy of an ionic, LM material suitable for using various parts of the machine, chi; / jaic productions. Manufacturing of products from the proposed material is produced by -Ps using the method of direct pressing 1 in a mold. X at a temperature of 155 + 5 ° C, and 250. + 50 kgf / cm and a holding time under pressure} 0.8-1 , 2 min per 1 mm from a distance. The introduction of belt conveyor rollers from the specified composition at the Belarusian Potash Combi {ate, Sumy Production Facility 1Ine1t Khimprom, Maardu, Kedain Yom and Gomel Chemical Plants reduces the life of conveyors by 2-2.5 times and significantly reduces the consumption of rubberized belts and rollers. At the Kedain Chemical Plant, the utilization rate of 1 thousand PO.LIKES has an economic effect of about 10 thousand rubles. In total, the annual consumption of rollers by the above mentioned medicines is about a thousand opuk. Consequently, the expected effect of using the proposed composition on these enterprises will be about 200 thousand rubles. Table

Density, g / cm Raschig flowability, mm Flexural modulus, kgf / cm Volume resistivity. Ohm-cm Coefficient of chemical reagent in a plastic sample, g-cm / cm. with

double superphosphate

ammophis

salt on cis-l i. uii

, YAG ,, N

horny KHCJioia flO np.ch)

1.30-1.4

1.3-1.4 150-170 60

60-1070.10

NO-SN M0-M0