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Preparation method of cationic waterborne polyurethane resin with high solid content

A water-based polyurethane and cationic technology, applied in the field of coatings, can solve problems such as the demand for polluting organic solvents, less isocyanate varieties, and narrow raw material sources, and achieve the effect of reducing the amount of finishing agents, firm adhesion, and soft, natural and plump appearance.

Inactive Publication Date: 2015-02-04
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are obvious deficiencies in the research on polyurethane leather finishing agents: the source of raw materials is narrow, polyols are mainly polyether type, polyester type is second, and polycarbonate is very few; there are fewer types of isocyanate, only TDI is reported, HDI and IPDI less reported
In terms of wood lacquer application, most of the wood lacquers on the market are still oily, and there are problems such as pollution and a large demand for organic solvents.

Method used

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  • Preparation method of cationic waterborne polyurethane resin with high solid content
  • Preparation method of cationic waterborne polyurethane resin with high solid content
  • Preparation method of cationic waterborne polyurethane resin with high solid content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Polyester (Mn=1000), Ymer TM Add N120, 1,8-octanediol, and triethanolamine into the reactor for mixing, and vacuum dehydrate at 0.05MPa, 107°C for 1h;

[0039] 2) Remove the vacuum, pass nitrogen protection, start to add toluene diisocyanate dropwise at 60°C, finish dropping for 1 hour and keep warm for 1 hour;

[0040] 3) Add dibutyltin dilaurate, lower the temperature to 50°C, start to add N-methyldiethanolamine dropwise, keep the temperature for reaction after 1h dropwise addition, measure the content of NCO until the content of isocyanate reaches the theoretical end point of 4.7%;

[0041] 4) Neutralize with glacial acetic acid to pH 6-7 at 40°C;

[0042] 5) Add deionized water at 40°C and stir at high speed to disperse, add ethylenediamine to extend the chain for 30 minutes, and remove acetone under reduced pressure to obtain a light yellow and relatively clear cationic waterborne polyurethane resin.

[0043] Wherein the raw material of various raw materials u...

Embodiment 2

[0048] 1) Polycarbonate diol (Mn=2000), Ymer TM Add N120, 1,4-butanediol, and triethanolamine into the reactor for mixing, and vacuum dehydrate at 0.05MPa, 107°C for 1h;

[0049] 2) Remove the vacuum, pass nitrogen protection, start to add toluene diisocyanate dropwise at 60°C, finish dropping for 1 hour and keep warm for 1 hour;

[0050] 3) Add dibutyltin dilaurate, lower the temperature to 50°C, start to add N-methyldiethanolamine dropwise, keep the temperature for reaction after 1h dropwise addition, measure the content of NCO until the content of isocyanate reaches the theoretical end point of 6.57%;

[0051] 4) Neutralize with glacial acetic acid to pH 6-7 at 40°C;

[0052] 5) Add deionized water at 40°C and stir at high speed to disperse, add ethylenediamine to extend the chain for 30 minutes, and remove acetone under reduced pressure to obtain a light yellow and clear waterborne polyurethane resin with high cationic content.

[0053] Wherein the raw material of various ...

Embodiment 3

[0058] 1) Polyester (Mn=1000), Ymer TM Add N120, 1,4-butanediol, and triethanolamine into the reactor for mixing, and vacuum dehydrate at 0.05MPa, 107°C for 1h;

[0059] 2) Remove the vacuum, pass nitrogen protection, start to drop toluene diisocyanate at 65°C, finish dropping for 1 hour and keep warm for 1 hour;

[0060] 3) Add dibutyltin dilaurate, lower the temperature to 50°C, start to add N-methyldiethanolamine dropwise, keep the temperature for reaction after 1h dropwise addition, measure the content of NCO until the content of isocyanate reaches the theoretical end point of 6.492%;

[0061] 4) Neutralize with acetic acid to pH 6-7 at 40°C;

[0062] 5) Add deionized water at 40°C and stir at high speed to disperse, add ethylenediamine to extend the chain for 30 minutes, and remove acetone under reduced pressure to obtain a light yellow and relatively clear cationic waterborne polyurethane resin.

[0063] Wherein the raw material of various raw materials used is (by wei...

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Abstract

The invention discloses a preparation method of cationic waterborne polyurethane resin with high solid content. The preparation method comprises the following steps: adding polyester dihydric alcohol, micromolecular dihydric alcohol, polyhydric alcohols and bis-hydroxyl polyethylene oxide ether into a reactor to heat, and dehydrating in vacuum; introducing nitrogen gas to protect, and dropwise adding diisocyanate at 60-80 DEG C; cooling to 45-55 DEG C, and dropwise adding hydrophilic monomer after adding a catalyst; keeping the reaction temperature to 45-50 DEG C and stopping heating until the content of isocyanate is detected to reach a theoretical end point; regulating the viscosity by using acetone, neutralizing by using acetic acid at 40 degrees until the pH value is 6-7; adding deionized water and a chain extender to stir and disperse at a high speed, and removing acetone under reduced pressure to obtain the cationic waterborne polyurethane resin. While being used as a leather finishing agent, the cationic waterborne polyurethane resin shows relatively firm adhesion with leather due to positive charges; while woodware is coated with the cationic waterborne polyurethane resin, tannic acid is fixed by virtue of electric charge effects to prevent the tannic acid from migrating, so that a wood plate is flat and smooth, and has gloss and good sealing effects.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a preparation method of a high-solid cationic waterborne polyurethane resin. Background technique [0002] Cationic water-based polyurethane has good wettability to hydrophobic polyester and plant fibers. At the same time, cationic water-based polyurethane is not sensitive to water hardness and can be used under acidic conditions. Therefore, it is widely used in the fields of textile, leather, papermaking and wood paint Wide application prospects. Polyurethane finishing products with excellent performance can cover leather defects, highlight fashion features, and endow finished leather with beautiful appearance, comfortable hand feeling and good mechanical and physical properties. Water-based polyurethane resin used as wood lacquer has the characteristics of non-toxic, odorless and pollution-free, and its hardness, water resistance and corrosion resistance are also very good....

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/44C08G18/48C08G18/32C09D175/06C09D175/08C14C11/00
CPCC08G18/12C08G18/3203C08G18/3228C08G18/3275C08G18/3281C08G18/4833C08G18/6674C08G18/6685C08G18/6688C09D175/06C09D175/08C14C11/006
Inventor 闫福安周玉琴
Owner WUHAN INSTITUTE OF TECHNOLOGY
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