Receiving modified wood chemi-mechanical process and шnvestigation of its properties

V. Shamaev

doi:doi:10.12737/17421

Receiving modified wood chemi-mechanical process and шnvestigation of its properties

Published в Forestry Engineering Journal · Volume 5, Issue 4, 2015 · Pages 177–187 · Rubrics: WOOD PROCESSING. CHEMICAL TECHNOLOGY

DOI 10.12737/17421

Received: 25.01.2016 Accepted: 25.01.2016 Published: 25.01.2016 Language of publication: RUS

Authors

V. Shamaev

ABSTRACT

The best method of hardening of low-value wood is pressing her to the extent of 40-50 %. About 2 times its volume decreases and, respectively, but the output of the modified wood. As hardener can be used on-nofibrillyarnuyu cellulose (NFP) in the form of a 2 % hydrogel magnetically activated. Completely replace the pressing NFP is impossible, since hydrogel has a very small concentration of NFP and receive content over 1 % in relation to dry wood impossible. Technology for producing modified wood involves activation of a 2 % hydrogel magnetization in STEL-49 to obtain the analyte with a potential of 600-800 mV and the pH = 2.5. In a 30 % aqueous urea solution was added 20 % activated hydrogel NFP stabilizer and 15 % the size of the particle board - UREAFORMALDEHYDE oligomer aqueous solution (UFC). The resulting mixture is impregnated with crude wood aspen or birch end under pressure to ensure through impregnation. The content of the mixture in the impregnated wood of 40-60 % by weight of the wood. The impregnated wood is dried with simultaneous compression to the extent of 20-25 %. The resulting wood has a moisture content 6-8 %, the density of 800-900 kg / m3, compressive strength parallel to the grain of 100-150 MPa. Due to the presence of urea loss on fire test is reduced 5 times. Biostability modified wood increases from baseline in 2-3 raza.Posle processing wood according to the procedure described obtained modified wood having a degree of compaction of 15 % birch and 25 % aspen, i.e. Use of the method reduces the degree of compaction is twice as compared with the known method, thus also increasing the yield of the resulting material. Reducing pressing for birch from 30 to 15 % increases the yield of modified wood by 15 %, ie 1 m3 with savings of 0.15 m3, with 1000 m3 -150 m3, When the selling price of the modified birch 30 thousand rubles. 1 m3 for savings of 150x30 = 4500 rubles. Reducing the degree of compaction of the aspen from 50 to 25 % increases the yield of modified wood by 25 %, i.e. 1 m3 with savings of 0.25 m3, with 1000 m3 -250 m3. When the selling price of the modified aspen wood 25 thousand rubles. 1 m3 for savings of 250x25 = 6250 rubles.

KEYWORDS

wood modification impregnation pressing nanotsellyuloza nanofibrils urea urea-formaldehyde condensate fire resistance biostability.

Information References

Authors:

Type:

Article

Pages:

from 177 to 187

Status:

Published

Language:

Russian

Keywords:

wood, modification, impregnation, pressing, nanotsellyuloza, nanofibrils, urea, urea-formaldehyde condensate, fire resistance, biostability.

References

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