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A kind of bamboo drying and heat treatment method

A heat treatment method and drying treatment technology, applied in the direction of wood heat treatment, wood treatment, wood treatment details, etc., can solve the problems of reducing the water absorption of bamboo and the decline of mechanical properties of heat-treated bamboo, and achieve low cost, improve dimensional stability, and improve drying. efficiency effect

Active Publication Date: 2020-07-31
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a bamboo drying and heat treatment method, which can significantly reduce the water absorption of bamboo, improve the dimensional stability of bamboo, and at the same time solve the problem of the decline in the mechanical properties of heat-treated bamboo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1. Paraffin wax modification treatment: mix L-912 polyethylene wax (molecular weight 1000-2000) with paraffin wax solid and pour it into the mixing tank. The amount of polyethylene wax added is 5% of the paraffin wax mass; after mixing, the temperature is raised to 100°C, The heating rate is 10°C / h, after the wax is fully melted, stir, and the stirring time is 3h;

[0025] S2. Bamboo chip drying treatment: inject modified paraffin into a treatment tank equipped with bamboo sheets with an initial moisture content of 30% for drying treatment; the temperature of the first stage modified paraffin is 100°C, and the treatment time is 2h; the second In the first stage, the degree of modified paraffin was reduced to 80°C, the treatment time was 16 hours, and the moisture content of bamboo chips was 7%;

[0026] S3, heat treatment of bamboo chips: continue to heat the modified paraffin at a speed of 10°C / h, raise the temperature of the modified paraffin to 180°C, and keep it fo...

Embodiment 2

[0030] S1. Paraffin modification treatment: mix domestic H1001 polyethylene wax (molecular weight 1500-3500) with paraffin solids and pour them into the mixing tank. The amount of polyethylene wax added is 5% of the paraffin mass; after mixing, heat up to 100°C and heat up The speed is 10°C / h, stir after the wax liquid is fully melted, and the stirring time is 4h;

[0031] S2. Bamboo glulam drying treatment: inject the modified paraffin into the bamboo glulam treatment tank with an initial moisture content of 40% for drying treatment; the temperature of the first stage modified paraffin is 120°C, and the treatment time is 3h, and the second In the first stage, the degree of modified paraffin was reduced to 80°C, and the moisture content was balanced. The treatment time was 24 hours, and the moisture content of the bamboo glulam was 8%;

[0032] S3. Heat treatment of bamboo glulam: continue to heat the modified paraffin at a rate of 10°C / h, raise the temperature of the modified...

Embodiment 3

[0036] A method for drying and heat-treating bamboo, which uses modified paraffin as a medium to dry and heat-treat bamboo (raw bamboo), comprising the following steps:

[0037] S1. Paraffin wax modification treatment: use polyethylene wax (molecular weight 3500-5000) to modify paraffin wax, mix polyethylene wax with paraffin wax, and add polyethylene wax in an amount of 3% of the mass of paraffin wax at 10°C / h Heat the mixture up to 100°C at a high speed, and stir for 2 hours after the paraffin wax is fully melted; the prepared modified paraffin wax has finer crystals and a denser structure, its drop melting point increases to 60-80°C, its molecular weight increases to 600-800, and its hardness is relatively low. Modified paraffin increased by 20-30%;

[0038] S2, bamboo drying treatment: inject the modified paraffin liquid obtained in step S1 into a treatment tank equipped with bamboo (raw bamboo) for drying treatment, and the bamboo drying treatment adopts segmental drying ...

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Abstract

The invention discloses a bamboo drying and heat treatment method. The bamboo drying and heat treatment method comprises the following steps: modifying paraffin by adopting polyethylene wax, pouring the modified paraffin liquid in a treatment tank, provided with bamboo, to be dried until the water content of the bamboo is reduced to 6 to 8 percent; heating the modified paraffin to 160 to 200 DEG C, and keeping the temperature for 2 to 6 hours; and cooling the modified paraffin to 75 to 100 DEG C, and taking out the bamboo until the modified paraffin in the bamboo is sufficiently cured. By adopting the bamboo drying and heat treatment method, the polyethylene wax modified paraffin is used as a medium to dry and thermally treat the bamboo, capillary tubes in bamboo cell walls begin to continuously expand in the treatment process, the modified paraffin of low molecular weight permeates into the capillary tubes of the bamboo so as to replace water, so that the bamboo can be rapidly dried;and in addition, under the action of the high-temperature modified paraffin, organic substances such as semi-cellulose and sugars in the bamboo cell walls can be degraded to form a pore structure, themodified paraffin can enter the cell wall structure, and after being cooled and cured, the modified paraffin can play a physical filling and reinforcing effect.

Description

technical field [0001] The invention belongs to the technical field of bamboo processing, in particular to a bamboo drying and heat treatment method. Background technique [0002] Bamboo high-temperature heat treatment technology is a modification technology that places bamboo materials in a high-temperature, oxygen-free or low-oxygen environment for short-term pyrolysis treatment. Through the degradation of hemicellulose in bamboo, the reduction of hydrophilic groups and the pyrolysis of nutrients such as starch and sugar can effectively improve the color, weather resistance and dimensional stability of bamboo. No chemical modifier is added in the treatment process, which has good environmental protection. In recent years, the industrial application of bamboo heat treatment technology has been realized. According to the different heat treatment media, the currently researched processes are mainly divided into three categories: steam treatment process, inert gas treatment p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K9/00B27K5/00
CPCB27K5/0085B27K9/002
Inventor 李延军王新洲许斌何文蒋身学
Owner NANJING FORESTRY UNIV
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