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Degreasing method for pines

A technology of pine wood and degreasing solution, which is applied in wood treatment, wood processing equipment, wood treatment details, etc. It 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-sized test pieces, etc. , to achieve the effects of low production cost, convenient operation and easy realization

Inactive Publication Date: 2015-04-08
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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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

[0019] A method for degreasing pine wood, adopting the following steps:

[0020] (1) Preparation of degreasing solution: according to the volume ratio V 乙醇 / V 石油醚 =1:1, uniformly mix ethanol and petroleum ether to prepare a degreasing liquid; wherein the boiling point of petroleum ether is 60°C;

[0021] (2), canning: according to V 松木 / V 脱脂液 =1:0.3 volume ratio Put the degreasing liquid and pine wood into the high-pressure degreasing tank; wherein the pine wood refers to the sawn timber of Pinus massoniana, and the thickness of the sawn timber is ≤6.5 cm;

[0022] (3) Degreasing treatment: Solvent degreasing treatment at a temperature of 40°C and a pressure of 0.6MPa for 5 hours, then cool to room temperature, and discharge the degreasing waste liquid; the degreasing waste liquid is volatilized at a temperature of 45°C and a vacuum of 0.04MPa, and the solution is recovered , to obtain by-product rosin;

[0023] (4) Degreasing with superheated steam: After draining the de...

Embodiment 2

[0025] A method for degreasing pine wood, adopting the following steps:

[0026] (1) Preparation of degreasing solution: according to the volume ratio V 乙醇 / V 石油醚 =1:1, uniformly mix ethanol and petroleum ether to prepare a degreasing liquid; wherein the boiling point of petroleum ether is 70°C;

[0027] (2), canning: according to V 松木 / V 脱脂液 =1:0.4 volume ratio Put the degreasing liquid and pine wood into the high-pressure degreasing tank; wherein the pine wood refers to the sawn timber of Pinus sylvestris, and the thickness of the sawn timber is ≤6.5 cm;

[0028] (3) Degreasing treatment: Solvent degreasing treatment at a temperature of 50°C and a pressure of 0.5MPa for 4.5 hours, then cool to room temperature, and discharge the degreasing waste liquid; where the degreasing waste liquid is volatilized and recovered at a temperature of 45°C and a vacuum of 0.05MPa Solution, obtain by-product rosin;

[0029] (4) Degreasing with superheated steam: After draining the degrea...

Embodiment 3

[0031] A method for degreasing pine wood, adopting the following steps:

[0032] (1) Preparation of degreasing solution: according to the volume ratio V 乙醇 / V 石油醚 =1:2, uniformly mix ethanol and petroleum ether to prepare a degreasing liquid; the boiling point of petroleum ether is 70°C;

[0033] (2), canning: according to V 松木 / V 脱脂液 =1:0.5 volume ratio Put the degreasing liquid and pine wood into a high-pressure degreasing tank; the pine wood refers to the sawn timber of slash pine, and the thickness of the sawn timber is ≤6.5 cm;

[0034] (3) Degreasing treatment: Solvent degreasing treatment at a temperature of 60°C and a pressure of 0.4MPa for 4 hours, then cool to room temperature, and discharge the degreasing waste liquid; the degreasing waste liquid is volatilized at a temperature of 50°C and a vacuum of 0.06MPa, and the solution is recovered , to obtain by-product rosin;

[0035] (4) Degreasing with superheated steam: After draining the degreasing waste liquid, i...

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Abstract

The invention discloses a degreasing method for pines, comprising the followings steps of: (1) a degreasing solution preparation: uniformly mixing ethanol and petroleum ether according to the volume ratio that V petroleum ether / V petroleum ether is 1:1 to 1:3 to prepare the degreasing solution; (2) potting: filling the degreasing solution and pines in a high-pressure degreasing pot according to the volume ratio that V pines / V degreasing solution is 1:0.3 to 1:0.7; (3) degreasing treatment: carrying out solvent degreasing at the temperature of 40-70 DEG C and under the pressure of 0.3-0.6MPa for 3-5h, cooling to normal temperature, and discharging a degreasing waste solution; and (4) degreasing by using over-hot steam: introducing the over-hot steam of 110-130 DEG C after the degreasing waste solution is exhausted, holding for 1-2h, cooling to be lower than 80 DEG C, releasing the pressure, and taking out the pines to obtain the degreased pines. The degreasing method has the following advantages of low cost, high efficiency, low pollution, fresh material color and high industrialization degree.

Description

technical field [0001] The invention relates to a method for degreasing pine wood, in particular to a multi-effect degreasing method for pine wood. Background technique [0002] At present, the degreasing methods of various pine woods are slightly different due to their different material properties, rosin content and inclusions, but the current pine 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 pin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K5/00
Inventor 张明龙彭万喜李年村
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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