Method for increasing dyeing and fixation rate of reactive dye to wood

Abstract

The invention discloses a method for increasing dyeing and fixation rate of a reactive dye to wood. The method for increasing the dyeing and fixation rate of the reactive dye to the wood comprises the following steps: respectively extracting to-be-dyed wood in hot water, NaOH solution and H2O2; after reactive dye liquor and anhydrous sodium sulphate are mixed, dyeing the extracted wood to obtain dyed wood; then carrying out fixation to the dyed wood by adopting an alkali silica sol fixing agent, wherein the alkali silica sol fixing agent is prepared by carrying out sol-gel reaction on ethyl orthosilicate, a silane coupling agent, ethanol, water and ammonia which are taken as raw materials; soaping with the fixed wood by adopting soap lotion, then washing with cold water, and drying, thus the dyed and fixed wood is obtained. The method for increasing the dyeing and fixation rate of the reactive dye to the wood has the advantages that a technology is simple, the dyeing and fixation rate of the reactive dye to the wood is high, and an alcohol organic solvent can be recycled, so that increase of difficulty for treating printing and dyeing wastewater caused by using a large number of salts is avoided, and the method for increasing the dyeing and fixation rate of the reactive dye to the wood is safe, energy-saving, economical and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of dyeing methods of wood reactive dyes, in particular to a method for improving the color fixation rate of wood reactive dyes with an alkaline silica sol color fixing agent. Background technique [0002] Wood dyeing is an important method for dye molecules to absorb, infiltrate and fix in wood to make the wood have a certain firm color, realize the optimal use of inferior wood, and correct the visual characteristics of wood. Reactive dyes can covalently bond with cellulose, hemicellulose, and lignin in wood, endowing wood with excellent color fastness, coupled with its bright color and complete color spectrum, it is more and more widely used in wood dyeing. Wood reactive dyes are generally fixed with soda ash color fixing agent. The principle is that under alkaline conditions, fibers and reactive dyes react chemically to form ether bonds (Cell-O-D) to fix reactive dyes on wood, but the dye solution Oh - I...

AI Technical Summary

Problems solved by technology

Wood reactive dyes are generally fixed with soda ash color fixing agent. The principle is that under alkaline conditions, fibers and reactive dyes react chemically to form ether bonds (Cell-O-D) to fix reactive dyes on wood, but the dye solution Oh - It can also undergo nucleophilic reaction with reactive dyes to generate hydrolyzed dyes, which not only reduces the color fixation rate of reactive dyes, but also easily produces floating colors

Moreover, hydrolyzed dyes cannot react with wood, and have little affinity for fibers. Strong soaping and water washing are required to remove floating colors, which increases water consumption and environmental pollution.

At the same time, the use of a large amount of soda ash makes the printing and dyeing wastewater contain a large amount of salt substances, which is not conducive to the biological treatment of wastewater, which aggravates the difficulty and cost of printing and dyeing wastewater treatment