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Deep staining methods for wood

A dyeing method and wood technology, which is applied in wood impregnation, wood treatment, impregnation of wood, etc., can solve the problems of short boosting and decompression time intervals, limited dyeing depth, steam consumption, etc., and achieve improved permeability and good color fastness , high color fixation effect

Active Publication Date: 2021-01-08
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Vacuum impregnation method, cold and hot tank method, and pressurized injection method in the existing deep dyeing technology all use the fixed pressure difference inside and outside the wood as the driving force to promote the dye to diffuse in the wood. Consumed, the concentration of the dye solution is diluted due to the blocking of the superficial layer, and the dyeing depth is limited
CN101125433A discloses a wood dyeing method using pressurized and decompressed processes. The pressure difference between the inside and outside of the wood is used to cause the dyeing liquid to move to achieve dyeing. Because the wood's transverse penetration and diffusion channel is the pit structure of the wood, the diameter of the pit film is 10 μm The pit plug is about 5 μm, the pore size is small, and the porosity is low. It takes a certain amount of time for the dye solution to penetrate or diffuse into the wood by pressure difference. Therefore, the time interval for boosting and decompressing in this method (especially after 4 hours of dyeing) It is relatively short, and the dye solution has not had time to penetrate or diffuse into the deeper layer of the wood, and one cycle has been completed. Each cycle can basically only make the dye reach the same wood depth, and the dyeing depth is also limited. At the same time, this method needs to consume steam, increase pressure and reduce pressure repeatedly. Circulation, resulting in excessive energy consumption in the dyeing process

Method used

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  • Deep staining methods for wood
  • Deep staining methods for wood
  • Deep staining methods for wood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as figure 1 Shown, a kind of depth staining method of wood of the present embodiment specifically comprises the following steps:

[0054] S1. Pretreatment: Saw poplar wood (specification 2600 mm×100 mm~300 mm×50 mm~80 mm, the specification of poplar sawn board in this embodiment is 2600 mm×100 mm×80 mm, moisture content 10% ) into a stainless steel airtight pretreatment tank, evacuated at 0.04 MPa for 0.5 h, and injected 0.2% NaOH solution and 0.8% cetyltrimethylammonium bromide (CTAB) solution at 40 °C with a multistage centrifugal booster pump, so that Poplar sawn board samples were soaked in the mixed solution, pressurized to 0.6 MPa, and pretreated with heat preservation and pressure for 4 h. Release the pressure, discharge the solution in the pretreatment tank, and vacuumize the sample at 0.04MPa for 0.5h to obtain the pretreated poplar sawn board.

[0055] S2. Put the pretreated poplar sawn board into a drying kiln at 40°C to dry until the moisture content ...

Embodiment 2

[0071] A kind of depth dyeing method of wood of the present embodiment specifically comprises the following steps:

[0072]S1. Pretreatment: Saw poplar wood (specification 2600 mm×100 mm~300 mm×50 mm~80 mm, the specification of poplar sawn board in this embodiment is 2600 mm×100 mm×80 mm, moisture content 10% ) into a stainless steel airtight pretreatment tank, vacuumed at 0.02 MPa for 0.5 h, and injected with 50 °C 0.2% NaOH solution, 0.6% cetyltrimethylammonium bromide (CTAB) and 0.4% Polyoxyethylene octylphenol ether (OP-10) solution, soak poplar sawn boards in the mixed solution, pressurize to 0.8 MPa, and pretreat with heat preservation and pressure for 4 h. Release the pressure, release the solution in the pretreatment tank, and vacuum the poplar sawn board at 0.02 MPa for 0.5 h to obtain the pretreated poplar sawn board.

[0073] S2. Put the pretreated poplar sawn board into a drying kiln at 40°C to dry until the moisture content of the poplar sawn board is 30%, to obt...

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Abstract

The invention discloses a deep dyeing method for wood. The method comprises the following steps that S1, pretreatment is carried out on wood, wherein the wood to be dyed is placed into a first closedcontainer, a solution containing NaOH and a first surfactant is added to carry out vacuum-pressurization-vacuum pretreatment, and the dried wood is obtained after drying; S2, dyeing treatment of the wood is carried out, wherein the dried wood obtained in the S1 is placed into a second closed container, a solution containing reactive dyes and a second surfactant is added to carry out vacuum-pressurization-vacuum dyeing treatment so as to obtain the primary dyed wood; and S3, post-treatment of the wood is carried out, wherein a soap washing liquid is added into the second closed container for vacuum-pressurization-vacuum color fixation treatment, and the dyed wood is obtained after drying. The deep dyeing method for the wood has the advantages of being simple in process, high in wood dyeingdepth and the like.

Description

technical field [0001] The invention relates to the technical field of wood reactive dye dyeing methods, in particular to a deep wood dyeing method. Background technique [0002] The dyeing of reactive dyes in wood is accomplished by the penetration, diffusion, and adsorption of reactive dye molecules from different directions to the interior of anisotropic wood. Pretreatment of wood before dyeing can improve the structural properties of wood itself, especially change the pit structure and quantity of wood, and reduce the content of extracts (especially NaOH extracts), which is to improve the permeability of reactive dyes in wood and realize The key to deep staining. When the wood is dyed, when the water content is saturated, the dye solution enters the wood in the form of diffusion and adsorption under the concentration gradient. At this time, the dyeing depth is mainly affected by the properties of the dye solution and the dyeing process conditions. Therefore, how to imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K5/02B27K3/08B27K3/52B27K5/04B27K3/50
CPCB27K3/08B27K3/50B27K3/52B27K5/02B27K5/04B27K2240/70
Inventor 喻胜飞刘元罗武生李贤军胡嘉裕唐玉莲吕霜霜
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY