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Polyurethane hydrophobic agent and preparation and use method thereof

A hydrophobic additive, polyurethane technology, used in polyurea/polyurethane coatings, applications, animal husbandry, etc., can solve the problems of no coating, high price of perfluorinated solvents, and high cost

Inactive Publication Date: 2018-07-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN103992043A discloses a method of hydrolyzing and extracting a long-chain fluoroalkyl group into a perfluorinated solvent to prepare a hydrophobic agent, but this method uses a large amount of fluoropolymers and expensive perfluorinated solvents. The high cost of the preparation method greatly limits its practical application
[0005] To sum up, after the traditional polyurethane coating agent finishes the leather base, it forms a special feel, pattern and gloss, and there are also shortcomings in the waterproof and anti-graffiti properties of the surface of the coating agent.
Directly use off-the-shelf hydrophobic polyurethane resin, which is expensive and has no finishing function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take 13.92g of toluene diisocyanate and 20g of dimethylformamide into a 100ml three-neck flask with heating, magnetic stirring and temperature controller, seal and dissolve, then take 5.07g of neopentyl glycol and dissolve in 10.14g of dimethylformamide Methylformamide was added dropwise to the flask through a constant pressure dropping funnel at a rate of 1ml / min. After the addition was complete, the reaction was carried out at 40°C and a stirring rate of 300rpm for 2 hours. The above reaction process required isolation from the air.

[0023] (2) Dissolve 5g of perfluorooctyl ethanol in 15g of dimethylformamide and add it to the reaction system of step (1), then raise the temperature of the system to 60°C, keep the temperature at 60°C, and stir at a speed of 400rpm, React for 4 hours, then add a small amount of isopropanol to terminate the reaction, measure the concentration of isocyanate groups in the system until the concentration of isocyanate groups in the syste...

Embodiment 2

[0026] (1) Take 13.92g of toluene diisocyanate and 20g of dimethylformamide into a 100ml three-necked flask with heating, magnetic stirring and temperature controller, seal and dissolve, then take 4.39g of butanediol and dissolve in 10g of dimethylformamide Formamide was added dropwise to the flask through a constant pressure dropping funnel at a rate of 2ml / min. After the dropwise addition was completed, the reaction was carried out for 3 hours. The reaction temperature was 35°C and the stirring speed was 400rpm. The above reaction process required isolation from the air.

[0027] (2) Dissolve 10g of perfluorooctyl ethanol in 15g of dimethylformamide and add it to the flask at one time, then raise the temperature of the system to 60°C, keep the temperature at 60°C, stir at 300rpm, react for 7h, and finally Add a small amount of n-butanol to terminate the reaction, measure the concentration of isocyanate groups in the system until the concentration of isocyanate groups in the s...

Embodiment 3

[0030] (1) Take 13.92g of toluene diisocyanate and 20g of dimethylformamide into a 100ml three-neck flask with heating, magnetic stirring and temperature controller, seal and dissolve, then take 2.54g of neopentyl glycol and 2.20g of butanediol Dissolve in 10g of dimethylformamide, and drop it into the flask through the constant pressure dropping funnel, the dropping speed is 1.5ml / min, react for 2h after the dropping, the reaction temperature is 50°C, the stirring speed is 350rpm, above The reaction process needs to be isolated from the air.

[0031] (2) Dissolve 10g of perfluorooctyl ethanol in 15g of dimethylformamide and add it to the flask at one time, then raise the temperature of the system to 60°C, keep the temperature at 60°C, stir at 250rpm, react for 5h, and finally Add a small amount of isopropanol to terminate the reaction, measure the concentration of isocyanate groups in the system until the concentration of isocyanate groups in the system is 0, stop stirring, e...

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Abstract

The invention discloses a method for preparing a polyurethane hydrophobic agent used for the field of a leather finishing agent. Toluene diisocynate (TDI) or methylene diphenyl diisocyanate (MDI), neopentyl glycol, butanediol or pentaerythritol are taken as raw materials, then perfluoroalkyl alcohol and isopropanol are added for cessation action, condensation reaction is carried out under heatingand stirring conditions, and the polyurethane hydrophobic agent with excellent properties is finally prepared. According to the method, the prepared product is a light yellow transparent liquid with agood hydrophobic effect, a small quantity of polyurethane hydrophobic agent is taken to be added into the leather surface finishing agent, the ratio of the adding mass of the polyurethane hydrophobicagent and mass of the finishing agent is 0.5-5:100, the surface hydrophobic property of the coating of the leather finishing agent can be greatly improved, and the hand feeling, lustre and other physical properties of the coating are not affected. The method for preparing the polyurethane hydrophobic agent used for the field of the leather finishing agent has the advantages that the technologicalprocess is simple, the percent conversion of the reaction is high, post-processing is not needed, the product is obtained easily and environmentally friendly, the reaction conditions are wild and controlled conveniently, the cost of the raw materials is low, and the polyurethane hydrophobic agent is very helpful for large-scale production.

Description

technical field [0001] The invention belongs to the field of hydrophobic agent preparation, in particular to a polyurethane hydrophobic agent and its preparation and use method. Background technique [0002] The wettability of the surface plays a vital role in the application of materials, and the modification of the surface of materials by low surface energy substances plays a vital role in improving the hydrophobicity of the surface of materials. Due to its excellent thermal stability, chemical inertness, low surface energy, and biocompatibility, fluorine-containing polyurethane has become a key research direction of hydrophobic agents at home and abroad. In the fields of shoe materials, luggage and clothing, a large number of leather materials are used, such as genuine leather, PU artificial leather and PVC artificial leather, etc.; in order to make these leather materials have special patterns and handles, the leather base is usually modified with polyurethane coating ag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/28C08G18/32C14C11/00C09D175/04
CPCC08G18/10C08G18/2885C08G18/3206C09D175/04C14C11/006
Inventor 潘朝群孙锐
Owner SOUTH CHINA UNIV OF TECH