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Preparation method of cationic waterborne polyurethane, leather back cover resin and leather coating

A water-based polyurethane and cationic technology, which is applied in the preparation of cationic water-based polyurethane and the field of cationic water-based polyurethane to prepare leather coatings, can solve the problems of poor water resistance, not easy to dry, and not resistant to yellowing of the film, and achieves increased molecular weight and enhanced mechanical properties. , Improve the effect of yellowing resistance and temperature resistance

Active Publication Date: 2022-04-19
HEFEI KETIAN WATERBORNE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is precisely because of its positive charge that the hydrophilicity is too high, resulting in poor water resistance of the film, not easy to dry, and poor temperature resistance. At the same time, the commercially available products are mainly aromatic systems, which are not resistant to yellowing and feel hard. problems, which in turn limit its application in mid-to-high-end leather finishing products and other key industrial fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of preparation method of cationic water-based polyurethane and leather coating, is characterized in that, comprises the following steps:

[0054] First, vacuum dehydrate ethanolamine at 95-110°C for 1.5h, put 20 parts of methyl acrylate and 32 parts of ethanolamine into a three-necked flask, and then pass nitrogen gas to react at 45°C for 1.5h, then put Containers and placed in a dry box for use.

[0055] Then weigh 50 parts of polytetrahydrofuran ether diol 1000 molecular weight, 15 parts of polytetrahydrofuran ether diol 2000 molecular weight, 5 parts of liquid polycarbonate diol, and 5 parts of castor oil according to the set weight ratio and place them in the reaction device, and After vacuum dehydration at 95°C for 1 hour, then lower the temperature to 65°C, add 45 parts of isophorone diisocyanate and 8 parts of hexamethylene diisocyanate to mix with it, add 0.5 parts of dibutyltin dilaurate catalyst, and react at 90°C 3h;

[0056] Then lower the temperatu...

Embodiment 2

[0062] A kind of preparation method of cationic water-based polyurethane and leather coating, is characterized in that, comprises the following steps:

[0063] First, dehydrate methylethanolamine under vacuum at 95-110°C for 1.5h, put 21 parts of octadecyl acrylate and 38 parts of methylethanolamine weighed in a three-necked flask, and then pass in nitrogen to react at 45°C for 1.8 h, then put it into a container and place it in a dry box for use.

[0064] Then weigh 30 parts of polytetrahydrofuran ether diol 1000 molecular weight, 20 parts of polytetrahydrofuran ether diol 2000 molecular weight, 15 parts of polytetrahydrofuran ether diol 3000 molecular weight, 8 parts of liquid polycarbonate diol, Put 6 parts of sesame oil in the reaction device, and dehydrate under vacuum at 95°C for 1 hour, then cool down to 65°C, add 65 parts of isophorone diisocyanate, 10 parts of hexamethylene diisocyanate and mix with it, and add 0.65 parts of carboxylic acid Bismuth catalyst, react at...

Embodiment 3

[0071] A kind of preparation method of cationic water-based polyurethane and leather coating, is characterized in that, comprises the following steps:

[0072] First, dehydrate aminoethylethanolamine under vacuum at 95-110°C for 1.5h, put 25 parts of ethyl acrylate and 40 parts of aminoethylethanolamine into a three-necked flask, and then inject nitrogen to react at 50°C 2h, then put it into a container and put it in a dry box for use.

[0073] Then weigh 30 parts of polytetrahydrofuran ether diol 1000 molecular weight, 15 parts of hydroxypropyl tetrahydrofuran triol, 35 parts of polytetrahydrofuran ether diol 3000 molecular weight, 10 parts of liquid polycarbonate diol, castor oil according to the weight ratio set. 8 parts were placed in the reaction device and dehydrated under vacuum at 95°C for 1 hour, then cooled to 65°C and added with 75 parts of isophorone diisocyanate, 8 parts of hexamethylene diisocyanate, 6 parts of methylcyclohexyl diisocyanate and Mix and add 0.6 p...

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Abstract

The invention relates to a preparation method of cationic water-based polyurethane, leather back cover resin and leather coating, and belongs to the field of polymer material preparation. The present invention combines the quaternization neutralization reaction with the acid neutralization reaction, and at the same time further assists the Michael addition reaction for post-chain extension to improve the reaction degree of the cationic hydrophilic chain extender in the synthesis process, and prepares a soft The cationic water-based polyurethane of the aliphatic system, the yellowing resistance grade of the cationic water-based polyurethane is ≥3, the modulus is as low as 0.5-1MPa, the breaking strength is 5-10MPa, and the elongation is 1000-1500%; the cationic water-based polyurethane Polyurethane is added with other synergists to prepare the back cover resin. The back cover resin is sprayed on the leather and then heated and dried in a gradient to endow the leather cover with better flex resistance and flexibility. Leather sealant resin used.

Description

technical field [0001] The invention relates to the field of polymer material preparation, in particular to a method for preparing a cationic waterborne polyurethane for leather finishing and a method for preparing a leather coating from the cationic waterborne polyurethane. Background technique [0002] With the continuous improvement of people's quality of life requirements, the environmental protection regulations of various countries have stricter requirements on functional coating materials. Waterborne polyurethane functional coating materials have the characteristics of no pollution, safe transportation, good working environment, safety and low price, etc. It is widely used in leather, furniture, construction, textile, automobile, printing and even medicine industries. Among them, cationic water-based polyurethane has a good bonding effect on leather hair fibers and textile synthetic fibers due to its positive charge, and can be absorbed by fabrics or leather during th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/44C08G18/62C08G18/36C08G18/32C08G18/12C09D175/14C09D193/04C09D7/65C09D7/61B05D7/12B05D7/24B05D3/02C14C11/00
CPCC08G18/6629C08G18/4063C08G18/4808C08G18/4854C08G18/44C08G18/6225C08G18/36C08G18/3206C08G18/3275C08G18/12C09D175/14C09D7/65C09D7/61B05D7/12B05D7/24B05D3/0254C14C11/00C14C11/006C08L2201/08C08L2205/035B05D2503/00C08L83/04C08L3/02C08L93/04C08L91/06C08K3/34
Inventor 李维虎闫成成孙之龙赵曦刘辉戴家兵朱保凌
Owner HEFEI KETIAN WATERBORNE TECH CO LTD
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