Alkaline silica sol color fixing agent and preparation method thereof

Abstract

The invention discloses an alkaline silica soil color fixing agent and a preparation method thereof. The alkaline silica soil color fixing agent is prepared by mixing ethyl orthosilicate, water, alcohol, a catalyst and a silane coupling agent as raw materials in the molar ratio of 1:(30-40):(20-30):(0.3-0.7):(0.001-0.01) and then performing a sol-gel reaction. The preparation method comprises the following steps: mixing ethyl orthosilicate with an alcohol solvent, stirring evenly to obtain a solution A, evenly mixing the water with the catalyst to obtain a solution B, putting 30wt% of the solution A into a reactor, heating to the range of 30-60 DEG C, dropwise adding the solution b and the left 70wt% of the solution A to the reactor under the condition of stirring, performing reflux condensation at a temperature ranging from 30 to 60 DEG C, reacting for 30 minutes, next, dropwise adding the silicone coupling agent, further stirring for reacting for 0.5-3 hours, and aging for 8-12 hours, thereby completing the preparation of the alkaline silica soil color fixing agent; the alkaline silica soil color fixing agent has the advantages of safety and environmental pollution, good color fixing effect, small silica sol particle size, narrow distribution and the like.

Description

technical field [0001] The invention relates to the technical field of color-fixing agents, in particular to an alkaline silica sol color-fixing agent and a preparation method thereof. Background technique [0002] Wood reactive dyeing is a process in which reactive dye molecules are adsorbed and infiltrated in wood, and the reactive active groups in the reactive dye molecules are combined with wood by covalent bonds to fix them in the wood. It is a coloring treatment for plantation fast-growing wood. To produce a wood processing method whose color, texture and other physical and mechanical properties reach or exceed ideal precious tree species wood, increase the added value of plantation fast-growing wood, and realize efficient utilization of plantation fast-growing wood. [0003] After wood is dyed with reactive dyes, although some reactive dyes are adsorbed on the surface of wood fibers but not chemically bonded to wood fibers, these reactive dyes that are not bonded to w...

AI Technical Summary

Problems solved by technology

Although the traditional color-fixing agent soda ash can improve the color fastness of wood, its strong alkalinity will hydrolyze 20-40% of reactive dyes, reducing the probability of reactive dyes reacting with wood fibers to form covalent bonds; Dyes are easily adsorbed on the surface of wood to form multi-layered associations, which hinder the further adsorption and diffusion of dye molecules, resulting in floating colors, which not only make the color fixation rate and color fastness not much improved, but also increase water consumption and Environmental pollution; at the same time, adding a large amount of soda ash makes the printing and dyeing wastewater contain a large amount of inorganic salts, which intensifies the difficulty of biological treatment of printing and dyeing wastewater

In the cotton textile industry, the use of more color-fixing agent Alkali Y can also improve the color fastness of wood, but because of the high formaldehyde content in Y, it will seriously affect human health and cause environmental pollution.

Images