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Easy-to-dye polyurethane resin for superfine fiber synthetic leather and preparation method thereof

A polyurethane resin and microfiber technology, applied in textiles and papermaking, can solve the problems of difficult dyeing, poor levelness, and poor color fastness, and achieve good dyeing uniformity, high dyeing rate, and high color fastness. Effect

Active Publication Date: 2018-02-27
HUAFON MICROFIBER SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of easy-to-dye polyurethane resin for superfine fiber synthetic leather, which solves the defects of difficult dyeing, poor level dyeing property and poor color fastness of existing polyurethane resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Put polytetrahydrofuran diol (PTMG2000) (100g), difunctional polyetheramine (PEA) D2000 (20g), solvent N,N-dimethylformamide (DMF) (100g) into the reaction flask, mix Evenly, put in MDI (12g) and pre-polymerize at 70°C for 80min;

[0033] (2) After the prepolymerization is completed, add ethylene glycol EG (11g), N-tert-butyldiethanolamine TBDEA (1.5g) and DMF (280g), add MDI (51g) in batches, react at 80°C, and the MDI reaction is complete Finally, add MDI to make the viscosity rise to 90Pa·s (25°C), stop adding;

[0034] Then add DMF (80g) to dilute the viscosity of the reactant to 60Pa·s (25°C), add 0.05g of methanol as a terminator to react for 30min, cool down to 50°C, and discharge the material to obtain the superfine fiber synthetic leather. Dyed polyurethane resin, the resin solid mass fraction is (30±1)%.

[0035] Used on synthetic leather base fabrics, tested with GB / T 29865-2013 method, Datacolors F650 computer color measurement and color matching instr...

Embodiment 2

[0037] (1) Put polytetrahydrofuran diol (PTMG2000) (120g), difunctional polyetheramine (PEA) D230 (10g) and DMF (100g) into the reaction flask, stir to make it mix evenly, drop into MDI (20g), heat up Prepolymerize at 60°C for 90 minutes;

[0038] (2) After the prepolymerization is completed, add ethylene glycol (EG) (10g), N,N'-bis(2-hydroxyethyl)succinamide (HEDA) (5g), DMF (320g) into the reaction flask , put in MDI (52g) in batches, keep the reaction at 70°C, after the MDI reaction is complete, add MDI to make the viscosity rise to 100Pa·s (25°C), stop adding;

[0039] Add DMF (80g) to dilute to a viscosity of 80Pa·s (25°C), add methanol (0.05g) as a terminator to react for 30min, cool down to 50°C and discharge, the obtained resin has a solid mass fraction of (30±1)%.

[0040] Used on synthetic leather base fabrics, tested by GB / T 29865-2013 method, Datacolors F650 computer color measurement and color matching instrument SCT-mixed transmission color measurement and color...

Embodiment 3

[0042] (1) Put polytetrahydrofuran glycol (PTMG) 2000 (120g), difunctional polyether amine (PEA) D2000 (30g), DMF (100g) into the reaction flask, stir to make it mix evenly, drop into MDI (14g), Raise the temperature to 80°C for 60 minutes of pre-polymerization;

[0043] (2) Add ethylene glycol (EG) (14g), N-tert-butyldiethanolamine (TBDEA) (1g) and DMF (380g), N,N'-bis(2-hydroxyethyl)oxamide (HEOA ) (4g), add MDI (70g) in batches, keep the reaction at 75°C, after the MDI reaction, add MDI to make the viscosity rise to 140Pa·s (25°C), stop adding;

[0044] Add DMF (80g) to dilute to a viscosity of 120Pa·s (25°C), add methanol (0.05g) as a terminator to react for 30min, drop to 50°C and discharge, the obtained resin has a solid mass fraction of (30±1)%.

[0045] Used on synthetic leather base fabrics, tested by GB / T 29865-2013 method, Datacolors F650 computer color measurement and color matching instrument SCT-mixed transmission color measurement and color matching system test...

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Abstract

The invention discloses easily-dyeable polyurethane resin used for superfine fiber synthetic leather and a preparation method thereof. The preparation method comprises the following steps: with isocyanate, polyol and a chain extender as starting materials, carrying out reaction, and diluting an obtained reaction product so as to obtain the easily-dyeable polyurethane resin used for the superfine fiber synthetic leather, wherein more than one of polyol and the chain extender contain an amide group, a secondary amino group or a tertiary amino group. The polyurethane resin provided by the invention has the advantages of high dye-uptake rate, good base fabric dyeing homogeneity, high color fastness and bright color after dyeing, and low dye usage amount; thus, production cost can be greatly reduced, and practical application values are obtained.

Description

technical field [0001] The invention relates to a polyurethane resin and a preparation method thereof. Background technique [0002] At present, microfiber synthetic leather is divided into indefinite island superfine fiber and fixed island superfine fiber synthetic leather, which is the most ideal material to replace natural leather. The base layer is a composite non-woven fabric material composed of superfine fibers and polyurethane (PU) elastomers. The superfine fibers are three-dimensionally cross-linked together to play a role of skeleton and support. The polyurethane is distributed around the fibers to make the entire synthetic leather base fabric form a whole. The surface layer is also made of polyurethane resin. The resulting product is comparable to high-grade natural leather in terms of internal microporous structure, appearance texture, physical properties, and wearing comfort. It has been widely used in clothing, manufacturing, etc. Shoes, automobiles and other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/50C08G18/32C08G18/12D06N3/14
CPCC08G18/12C08G18/3206C08G18/3275C08G18/3825C08G18/4018C08G18/4804C08G18/4854C08G18/5021C08G18/6607C08G18/6674C08G18/6688D06N3/14
Inventor 杜明兵张其斌杨银龙吴勇诸葛磊刘国胡雪丽彭超豪王贺玲蔡肖燕
Owner HUAFON MICROFIBER SHANGHAI
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