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Degreasing method for wood

A wood and degreasing tank technology, which is applied in wood treatment, wood processing equipment, wood treatment details, etc., can solve the problems of great variation and difficulty in the permeability of degreasing liquid, and it is difficult to accurately reflect the penetrating characteristics of degreasing liquid of large-scale test pieces, etc. , to achieve the effect of low production cost, convenient operation and easy realization

Inactive Publication Date: 2012-12-26
湖南湘益竹木新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Secondly, because it is difficult to measure the degreasing fluid permeability coefficient of large-sized specimens in practice, and the current research on degreasing penetration is based on laboratory-scale small-sized specimens, and the variation of degreasing fluid permeability is extremely large. The degreasing fluid permeability of large-sized specimens has certain limitations in practical applications, and it is difficult to accurately reflect the actual degreasing fluid permeability characteristics of large-sized specimens

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of wood degreasing method, adopts following steps:

[0019] (1) Preparation of color retention solution: according to the mass ratio m 连二亚硫酸钠 :m 氯化钠 =10:0.1, uniformly mix sodium dithionite and sodium chloride, and then prepare an aqueous solution with a concentration of 0.5% by mass percentage to prepare a color-preserving solution;

[0020] (2), canning: according to the volume ratio V 木材 / V 保色液 =1:0.5 color retention liquid and wood are packed into high-pressure degreasing tank; wherein wood refers to pine sawn timber;

[0021] (3) Color retention treatment: keep warm for 7 hours at a temperature of 20°C and a pressure of 0.9 MPa, and then drain the liquid; after draining the liquid, open the degreasing tank and unload the color retention wood;

[0022] (4) Dry the color-preserving wood in the flue gas at 50°C for 3 days, then continue to dry in the flue gas at 80°C for 3 days, and then continue to dry in the flue gas at 95°C for 1 day to obtain degreased ...

Embodiment 2

[0024] A kind of wood degreasing method, adopts following steps:

[0025] (1) Preparation of color retention solution: according to the mass ratio m 连二亚硫酸钠 :m 氯化钠 =10:1, uniformly mix sodium dithionite and sodium chloride, then prepare an aqueous solution with a mass percentage concentration of 2.5%, and prepare a color-preserving solution;

[0026] (2), canning: according to the volume ratio V 木材 / V 保色液 =1:1.0 color retention liquid and wood are packed into high-pressure degreasing tank; wherein wood refers to pine sawn timber;

[0027] (3) Color retention treatment: keep warm for 6 hours at a temperature of 30°C and a pressure of 0.6 MPa, and then drain the liquid; after draining the liquid, open the degreasing tank and unload the color retention wood;

[0028] (4) Dry the color-preserving wood in flue gas at 55°C for 3 days, continue to dry in flue gas at 85°C for 2 days, and then continue to dry in flue gas at 100°C for 0.5 days to obtain degreased wood; The gas is th...

Embodiment 3

[0030] A kind of wood degreasing method, adopts following steps:

[0031] (1) Preparation of color retention solution: according to the mass ratio m 连二亚硫酸钠 :m 氯化钠 =10:2, uniformly mix sodium dithionite and sodium chloride, then prepare an aqueous solution with a mass percentage concentration of 3.5%, and prepare a color-preserving solution;

[0032] (2), canning: according to the volume ratio V 木材 / V 保色液 =1:0.5 color retention liquid and timber are packed into high-pressure degreasing tank; Wherein timber refers to Chinese fir sawn timber;

[0033] (3) Color retention treatment: keep warm for 5 hours at a temperature of 40°C and a pressure of 0.4 MPa, and then drain the liquid; after draining the liquid, open the degreasing tank and unload the color retention wood;

[0034] (4) Dry the color-preserving wood in flue gas at 50°C for 3 days, then continue to dry in flue gas at 90°C for 2 days, and then continue to dry in flue gas at 95°C for 1 day to obtain degreased wood; T...

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Abstract

The invention discloses a degreasing method for wood, which comprises the following steps: (1) preparing a color maintaining solution, to be specific, uniformly mixing sodium hydrosulfite with sodium chloride according to a mass ratio of m sodium hydrosulfite to m sodium chloride being equal to (10:0.1)-(10:2), and then preparing an aqueous solution with a mass percent concentration being 0.5%-3.5%, thereby obtaining the color maintaining solution; (2) canning: placing the color maintaining solution and wood into a high-pressure degreasing can according to a volume ratio of V wood to V color maintaining solution being equal to (1:0.5)-(1:1.5); (3) performing color maintaining treatment: keeping the temperature for 5-7h under the conditions of the temperature at 20-40 DEG C and the pressure at 0.4-0.9MPa, and then discharging the liquid, after completely discharging the liquid, opening the degreasing can and discharging the color maintained wood; and (4) drying the color maintained wood for 2-3 days in the smoke at 50-60 DEG C, drying for 2-3 days in the smoke at 80-90 DEG C, and then drying for 0.5-1 day in the smoke at 95-105 DEG C, thereby obtaining the degreased wood. The degreasing method for wood provided by the invention is easy to realize, convenient to operate, low in production cost and environment-friendly.

Description

technical field [0001] The invention relates to a method for degreasing wood, in particular to a method for degreasing wood flue gas. Background technique [0002] At present, the degreasing methods of various pine or fir are slightly different due to their different wood properties, fat content and inclusions, but the current wood degreasing methods and technologies can be summarized into five types: (1) lye saponification method, (2) ) solvent extraction method, (3) catalytic polymerization method, (4) high temperature drying method, (5) vacuum drying method. [0003] Generally, in order to improve the degreasing effect, two or more degreasing methods are often combined, but the manufacturers are not ideal in practical applications. For example, the pine wood processed by lye saponification has low degreasing rate, easy to change color, dull luster, and the problem of waste water has not been fundamentally solved, which hinders the development of pine solid wood product p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/00
Inventor 彭万喜李年村张明龙
Owner 湖南湘益竹木新材科技有限公司
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