Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of waterborne one-component polyurethane paint with low viscosity

A water-based polyurethane and oligomer technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of affecting emulsion stability, inconvenient production and application, large resin particle size, etc., and achieves extensive use of technology and excellent mechanical strength , Apply easy and quick effects

Active Publication Date: 2014-04-02
ZHEJIANG RONGTAI TECH ENTERPRISE
View PDF11 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of waterborne polyurethane according to the conventional method needs to use a large amount of substances containing hydrophilic groups, such as: dimethylol propionic acid and dimethylol butyric acid, etc., in order to achieve a good self-emulsifying effect, which will inevitably weaken the paint. Water resistance, strength and insulation of membrane
At the same time, the increase of hydrophilic groups will also enhance the hydrogen bonding of molecular chains, so the viscosity of the system is also high, which limits the increase of solid content and brings inconvenience to production and application.
And reducing the content of hydrophilic group-containing substances will make the resin particle size larger, thus affecting the stability of the emulsion

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of waterborne one-component polyurethane paint with low viscosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a reaction flask protected by nitrogen and equipped with a reflux device, add 201.92 g (0.40 moles of OH) of polyphthalic anhydride diethylene glycol ester polyol with a hydroxyl value of 112 mg KOH / g after vacuum dehydration at 120 ° C, and then add 5g methyl ethyl ketone, stop heating after heating up to 50°C. Add MDI-50144.38g (1.15mol NCO) dropwise slowly with a dropping funnel. After 1.5 hours of dropping, the system automatically exotherms for 1 hour, and then reacts at 65°C for 0.5 hours. After the system is stable, add 0.18g of dibutyltin dilaurate, keep warm at 75°C until the measured NCO content is 9.08%, add an appropriate amount of acetone to adjust the viscosity to 4720mPa·s, and obtain an isocyanate-terminated oligomer.

[0039] Add 42.4 g of diethylene glycol (0.8 mol OH) and 16.75 g of dimethylol propionic acid (0.25 mol OH) in a reaction flask protected by nitrogen and equipped with a reflux device. And 13.8g of glycerin (0.45 moles of OH), then add...

Embodiment 2

[0043] In a reaction flask protected by nitrogen and equipped with a reflux device, add 140.25 g (0.3 mole OH) of polycaprolactone polyol with a hydroxyl value of 120 mgKOH / g and a polyol with a hydroxyl value of 110 mgKOH / g at 120 ° C. Propylene glycol 150g (0.3 mole OH), then add 6g methyl ethyl ketone, heat up to 50°C and stop heating. Slowly add 130.62 g of TDI (1.5 moles of NCO) dropwise with a dropping funnel. After 1.5 hours of dropping, the system automatically exotherms for 1 hour, and then reacts at 65°C for 0.5 hours. After the system is stable, add 0.2 g of dibutyltin dilaurate, keep warm at 75°C until the measured NCO content is 8.97%, add an appropriate amount of acetone to adjust the viscosity to 4290mPa·s, and obtain an isocyanate-terminated oligomer.

[0044] In a reaction flask protected by nitrogen and equipped with a reflux device, add 45.6 g (1.2 moles of OH) of propylene glycol, 20.1 g of dimethylol propionic acid (0.3 moles of OH) and trimethylol Add 20...

Embodiment 3

[0048] In a reaction flask protected by nitrogen and equipped with a reflux device, add 201.92g (0.40 mole OH) of polyphthalic anhydride diethylene glycol ester polyol with a hydroxyl value of 112mgKOH / g after vacuum dehydration at 120°C, and then add 10g Methylpyrrolidone, stop heating after heating up to 50°C. Add MDI-50144.38g (1.15mol NCO) dropwise slowly with a dropping funnel. After 1.5 hours of dropping, the system automatically exotherms for 1 hour, and then reacts at 65°C for 0.5 hours. After the system is stable, add propylene glycol, dimethylolpropionic acid and glycerin, add 0.18g of dibutyltin dilaurate, and react at 75°C. During this process, the viscosity of the system is reduced by adding acetone. When the NCO content is 0.51%, a water-based polyurethane resin is obtained, and the measured acid value is 29 mgKOH / g.

[0049] Add triethylamine to the above resin for neutralization, then add it into deionized water, emulsify and disperse at 800rpm for 30min. Aft...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Acid valueaaaaaaaaaa
Acid valueaaaaaaaaaa
Login to View More

Abstract

A preparation method of waterborne one-component polyurethane paint with low viscosity comprises the following steps: firstly, polymeric polyol and polyisocyanate react in a ratio of 1:(1.8-3.4) to generate an isocyanate-group terminated oligomer (a); secondly, low molecular polyol and polyisocyanate react in a ratio of 1:(0.3-0.5) to generate a hydroxyl terminated oligomer (b); the oligomer (a), the oligomer (b) and a polylactic acid oligomer react in a ratio of 1:(0.78-0.92):(0.02-0.95) to obtain waterborne polyurethane resin (c), wherein the molecular weight of the polylactic acid oligomer is 800-1,200 g / mol; and finally, a product is obtained through self-emulsification. According to the waterborne polyurethane paint prepared with the method, the viscosity is smaller than 60 s, the storage life is longer than 3 months, the solid content is higher than 40%, the water resistance of condensate is high, the insulativity is high, the mechanical strength is excellent, and the paint can serve as surface insulation paint for a transformer, a charger and a motor coil.

Description

technical field [0001] The invention relates to a method for preparing polyurethane resin, in particular to a modified epoxy impregnating resin with excellent insulation performance under high voltage, high heat resistance, storage stability and good compatibility, especially suitable for F and H grades Vacuum pressure impregnation insulation process for coils of large and medium-sized high-voltage motors, wind power motors and other high-voltage electrical appliances. Background technique [0002] Water-based polyurethane paint is a water-based paint with water as the dispersion medium. Because it contains no or only a small amount of VOC, and is non-toxic, non-polluting, safe and reliable, it is a green and environmentally friendly water-based paint. The resin matrix contained in the water-based polyurethane paint is polyurethane, which endows the cured paint film with excellent adhesion, high flexibility, wear resistance, oil resistance, adjustable softness and hardness, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09D175/06C09D175/08C08G18/42C08G18/64C08G18/76C08G18/48C08G18/32C08G18/34C08G18/12
Inventor 曹万荣马苗施萍唐杰中沈彬莫东惠
Owner ZHEJIANG RONGTAI TECH ENTERPRISE
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com