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Preparation method for transference resistance leather dye

A migration-resistant, leather-based technology that is applied in dyeing, organic dyes, textiles, and papermaking. It can solve the problems of poor color fastness of leather, casein resistance to light, and migration resistance, and achieve good color and transparency. , easy control of functionality, and stable performance of dyes

Inactive Publication Date: 2012-10-24
CHINA LEATHER & FOOTWEAR IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a three-roller grinding machine, the pigment particles are coarse and uneven in size, and the coloring power and hiding power are not ideal, so that the leather finishing layer is thick, and the smoothness and fineness are poor, which affects the quality of finishing.
Casein as a stabilizer is not light fast, it will affect the whiteness of white leather and the brightness of colored leather, and it is easy to spoil
And the coloring method of adding pigment paste often leads to poor color fastness of leather, especially serious color fading by wet friction, and the color durability and solvent resistance of leather after dyeing and finishing are not good.
The above shortcomings can be overcome by using soluble dyes, but it is not resistant to solvents and has become an Achilles' heel that limits its application.
In addition, small molecule dye water is generally added to the top coating to further color the leather, but the toxicity of small molecule dyes (except for a few), poor fastness, opacity, solvent resistance and migration resistance, and low Heat resistance severely limits the application of small molecule dyes

Method used

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preparation example Construction

[0031] The technical process of the preparation of the anti-migration leather polymer dye of the present invention is as follows:

[0032] Add metered isocyanates, polyols and catalysts into the reactor, wherein the molar ratio of isocyanates to polyols is 1:0.10 to 0.50, preferably 1:0.15 to 0.45, and the catalyst is 0.02% to 0.02% of the total weight of isocyanates, polyols and reactive dyes 0.06%, preferably 0.03%~0.05%, stirring reaction at 60~90°C for 60~180min, preferably 70~80°C, 90~130min, to generate polyurethane prepolymer; The total weight of polyols and reactive dyes is 50% to 100%; when reactive dyes are added, the molar ratio of isocyanate to reactive dyes is 1:0.65 to 0.90, preferably 1:0.70 to 0.80, and the reaction is stirred at 60 to 95°C for 60 to 180 minutes , preferably 75-90°C, 90-150min; adding a chain extender, the molar ratio of isocyanate to chain extender is 1:0.10-0.60, preferably 1:0.20-0.50, and the hydroxyl-containing chain extender reacts at 70-95...

Embodiment 1

[0035] Add 672.8kg HDI, 2000kg polypropylene glycol 2000, 2.01kg dibutyltin dilaurate to the reaction kettle, stir and react at 75°C for 120min to form a polyurethane prepolymer; add 4000kg N, N-dimethylformamide and stir evenly; add 1145.5kg Reactint-Black X41LV (hydroxyl value: 137), react at 90°C for 120min, then add 212.7kg of hexanediol, react at 80°C for 60min; then add 2515kg N,N-dimethylformamide dropwise to obtain a solid content of 38.22 % of migration resistant leather dyes.

Embodiment 2

[0037] Add 1111.5kg of IPDI, 1500kg of polypropylene glycol 1500, and 1.71kg of dibutyltin dilaurate into the reaction kettle, and stir and react at 80°C for 90 minutes to form a polyurethane prepolymer; add 3500kg of tetrahydrofuran and stir evenly; add 1468.9kg of reactint-red X64 (Hydroxyl value: 180), react at 80°C for 150min, then add 188.5kg of 2-aminoethylethanolamine, react at 75°C for 50min; add dropwise 3000kg of tetrahydrofuran to obtain a migration-resistant leather dye with a solid content of 39.64%.

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PUM

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Abstract

The present invention discloses a preparation method for a transference resistance leather dye, wherein an active group-containing dye, an anti-yellowing isocyanate compound, a hydroxyl group-containing polymer, a compound containing a hydroxyl group and a hydrophilic functional group, a chain extender, and the like are subjected to polymerization to obtain a product of the present invention. The dye prepared by the method of the present invention has the following advantages that: performance is stable, and transference resistance of products dyed by the dye is excellent. The method of the present invention has advantages of simple synthetic route, molecular weight adjusting, easy functionality control, and the like. The dye prepared by the method of the present invention can be used for leather dyeing, and colorant components in leather coating and synthetic leather coating.

Description

technical field [0001] The invention relates to a preparation method for preparing polyurethane polymer migration-resistant leather dye, which belongs to the field of leather chemical materials. The dye obtained by the preparation method of the invention can be applied to leather dyeing and colorant components in leather and synthetic leather coatings. Background technique [0002] In the production process of leather, the leather is further colored by adding pigment paste to the polymer resin slurry in the bottom or middle layer coating or adding dye water in the top layer coating in the finishing process, so as to prepare rich-colored leather materials. The pigment paste used in the finishing process is generally a paste made by mixing and grinding pigments, casein, sulfated oil, preservatives, etc. It has strong hiding power, bright color and certain air permeability. It can be mixed with resin film former to prepare finishing paste, which is used for bottom and middle l...

Claims

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Application Information

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IPC IPC(8): C09B69/10C08G18/66C08G18/48D06P3/32D06P1/38
Inventor 庞晓燕陈永芳丁志文
Owner CHINA LEATHER & FOOTWEAR IND RES INST
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