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CN-122008373-A - Wood dyeing method

CN122008373ACN 122008373 ACN122008373 ACN 122008373ACN-122008373-A

Abstract

The invention provides a method for dyeing wood, and belongs to the technical field of wood dyeing. The invention carries out bleaching treatment on wood, carries out pretreatment on bleached wood by utilizing inorganic alkaline solution, carries out cation modification on pretreated wood in cation modification liquid, and carries out dyeing on cation modified wood in acid dye dyeing liquid to obtain cation modified dyed wood. The invention uses inorganic alkaline solution to pretreat the bleached wood, under alkaline condition, hydroxyl groups on the surface of wood fiber are more easily activated, the reactivity is increased, cationic groups in cationic modifier and hydroxyl groups in wood cellulose are more easily subjected to chemical reaction, so that more stable covalent bond combination is formed, more cationic modifier is grafted to the wood fiber by a chemical grafting method, more positively charged groups are introduced on the surface of wood, and further, the dye-uptake is improved, and the method is suitable for dyeing and processing of wood materials such as recombined decorative veneers, veneer veneers and the like.

Inventors

  • GUI CHENGSHENG
  • ZHOU XINLIN
  • LIU WENSHENG
  • ZHAO JIANZHONG
  • Fu JueJie
  • YUAN CHENGLONG
  • ZHAO ZHONGQING
  • YU YANFEN

Assignees

  • 浙江升华云峰新材股份有限公司

Dates

Publication Date
20260512
Application Date
20260331

Claims (10)

  1. 1. A method of dyeing wood, comprising the steps of: bleaching the wood to obtain bleached wood; pretreating the bleached wood by using an inorganic alkaline solution to obtain pretreated wood; carrying out cationic modification on the pretreated wood in a cationic modification liquid to obtain cationic modified wood, wherein the cationic modification liquid comprises a cationic modifier, an inorganic alkaline compound and water; and (3) placing the cation modified wood in acid dye dyeing liquid for dyeing to obtain cation modified dyed wood.
  2. 2. The dyeing method according to claim 1, wherein the concentration of the inorganic alkaline solution is 0 to 50g/L and not 0.
  3. 3. The dyeing method according to claim 1, wherein the inorganic basic compound includes one or more of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.
  4. 4. The dyeing method according to claim 1 or 3, wherein the concentration of the inorganic basic compound in the cation-modified liquid is 0 to 50g/L and not 0.
  5. 5. Dyeing process according to claim 1, characterized in that the cationic modifier comprises an epoxy quaternary ammonium salt type cationic modifier and/or a chlorotriazine quaternary ammonium salt.
  6. 6. The dyeing method according to claim 5, wherein the cationic modifier of epoxy quaternary ammonium salt type comprises one or more of glycidyl dimethyl butyl ammonium chloride, glycidyl trimethyl ammonium chloride and glycidyl triethyl ammonium chloride.
  7. 7. The dyeing method according to claim 1 or 5, wherein the concentration of the cationic modifier in the cationic modifying liquid is 0.1 to 30g/L.
  8. 8. Dyeing process according to claim 1, characterized in that the cationic modification is carried out at a temperature of 35-95 ℃ for a time of 0.25-3 h.
  9. 9. The dyeing method according to claim 1, wherein the concentration of the acid dye solution is 0.36-0.6 g/L.
  10. 10. Dyeing method according to claim 1, characterized in that the dyeing is followed by lamination gluing, compression moulding and planing in sequence.

Description

Wood dyeing method Technical Field The invention relates to the technical field of wood dyeing, in particular to a wood dyeing method. Background The recombined decorative material (technical wood) is used as a novel wood material, and is widely applied to indoor decoration by virtue of the advantages of being capable of accurately reproducing the textures and rich colors of rare wood. However, the increasingly stringent environmental regulations and resource conservation requirements make the traditional dyeing process face double bottlenecks due to insufficient color fastness and high pollution load of dye wastewater. Acid dyes are widely used for dyeing recombinant decorative veneers due to their vivid color, simple dyeing process and good permeability. However, acid dyes have poor stability and are easily desorbed from the fiber surface, resulting in a final product with low color fastness. In addition, both the acid dye molecules and the wood fiber surfaces are negatively charged, which can impede the binding of the dye to the wood fibers during dyeing due to coulomb repulsion. Currently, the mainstream dye fixing technology mainly involves the use of color stabilizers, which not only increases the complexity of the dyeing process, but also causes serious environmental pollution. In addition, the existing chemical modification method may have the problems of complex steps, high cost, negative influence on wood performance and the like, so that the industrial popularization is difficult. The related art discloses a method for dyeing wood, which adopts a specific amine compound to pretreat the wood, so that the wood has stronger adsorption and fixation effects on acid dye, thereby remarkably improving the dyeing efficiency, but still has the problem of low dye-uptake. Disclosure of Invention In view of the above, an object of the present invention is to provide a method for dyeing wood. The dyeing method has high dye-uptake. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a method for dyeing wood, which comprises the following steps: bleaching the wood to obtain bleached wood; pretreating the bleached wood by using an inorganic alkaline solution to obtain pretreated wood; Carrying out cation modification on the pretreated wood in cation modification liquid to obtain cation modified wood (CBW), wherein the cation modification liquid comprises a cation modifier, an inorganic alkaline compound and water; And (3) placing the cation modified wood into an acid dye dyeing liquid for dyeing to obtain cation modified dyed wood (DCBW). Preferably, the concentration of the inorganic alkaline solution is 0-50 g/L and is not 0. Preferably, the inorganic basic compound includes one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate. Preferably, the concentration of the inorganic alkaline compound in the cation modifying liquid is 0-50 g/L and is not 0. Preferably, the cationic modifier comprises an epoxy quaternary ammonium salt cationic modifier and/or a chlorotriazine quaternary ammonium salt. Preferably, the epoxy quaternary ammonium salt cationic modifier comprises one or more of glycidyl dimethyl butyl ammonium chloride, glycidyl trimethyl ammonium chloride and glycidyl triethyl ammonium chloride. Preferably, the concentration of the cationic modifier in the cationic modification liquid is 0.1-30 g/L. Preferably, the temperature of the cationic modification is 35-95 ℃ and the time is 0.25-3 h. Preferably, the concentration of the acid dye dyeing liquid is 0.36-0.6 g/L. Preferably, the dyeing further comprises laminated gluing, compression molding and planing sequentially. The invention provides a method for dyeing wood, which comprises the following steps of carrying out bleaching treatment on wood to obtain bleached wood, carrying out pretreatment on the bleached wood by utilizing an inorganic alkaline solution to obtain pretreated wood, carrying out cation modification on the pretreated wood in a cation modification liquid to obtain cation modified wood, wherein the cation modification liquid comprises a cation modifier, an inorganic alkaline compound and water, and placing the cation modified wood in an acid dye dyeing liquid to dye to obtain cation modified dyed wood. Compared with the prior art, the invention has the following beneficial effects: According to the invention, inorganic alkaline solution is utilized to pretreat the bleached wood, under alkaline conditions, hydroxyl groups on the surface of wood fibers are more easily activated, the reactivity of the hydroxyl groups is increased, cationic groups in the cationic modifier and hydroxyl groups in the wood cellulose are more easily subjected to chemical reaction, so that more stable covalent bond combination is formed, more cationic modifiers are grafted onto the wood fibers by a chemical grafting method, more positively charged gro