Check patentability & draft patents in minutes with Patsnap Eureka AI!

Large-particle-size waterborne polyurethane dispersion and preparation method thereof

A water-based polyurethane dispersion technology, applied in the field of water-based polyurethane dispersion, to achieve good dilution stability, good stability, and the effect of expanding the application field

Pending Publication Date: 2021-05-14
重庆中科力泰高分子材料有限公司
View PDF18 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for improving the particle size of water-based polyurethane dispersions are generally to adjust the proportion, type and emulsification process of hydrophilic groups, etc., but the water-based polyurethane dispersions prepared by these methods are still stable at smaller particle sizes, and the effect efficient

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
  • Large-particle-size waterborne polyurethane dispersion and preparation method thereof
  • Large-particle-size waterborne polyurethane dispersion and preparation method thereof
  • Large-particle-size waterborne polyurethane dispersion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] A kind of preparation method of large particle size aqueous polyurethane dispersion, concrete steps are as follows:

[0048] (1) Vacuum dehydration of macromolecular dihydric alcohol at 120°C for 1-2 hours, add carboxylic acid type hydrophilic chain extender and mix evenly, add diisocyanate at 80-90°C for 2-3 hours, add small molecule alcohol to extend chain A few drops of solvent and catalyst, a small amount of solvent acetone to control the reaction viscosity, continue to react for 1 to 2 hours to obtain polyurethane prepolymer; the amount of acetone is about 10% to 15% of the total amount of macromolecular diols, chain extenders, and diisocyanates , can be adjusted according to the size of the viscosity.

[0049] (2) Add a certain amount of acetone and hydrophobic solvent to the polyurethane prepolymer to lower the temperature and reduce the viscosity. When the temperature drops to 40-50°C, add a neutralizer to react for 15-30 minutes to obtain a polyurethane prepoly...

Embodiment 1～5

[0054] Embodiment 1~5, the addition amount of each component in comparative example 1~3 adds the mass parts number shown in the following table:

[0055]

[0056]

[0057] In the present invention, through a large number of component tests, it is found that the addition of a hydrophobic solvent has a significant impact on the morphology, particle size and stability of the dispersion. Further, the content of hydrophobic solvent and acetone in the overall formula will have an important influence on each other, and its amount should be appropriately reduced. The large particle size waterborne polyurethane dispersion has good stability, and no particle precipitation or delamination occurs. Further, the particle size of each component can reach 400-600nm in an appropriate ratio, and the mechanical stability and dilution stability are both excellent.

Embodiment 2

[0059] The physical properties of Examples 1 to 5 and Comparative Examples 1 to 3 are compared, and the results are as follows:

[0060] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1 Comparative example 2 Comparative example 3 Solid content / % 40.0 39.7 40.1 40.7 41.2 39.8 40.5 40.5 Particle size / nm 408 488 466 575 453 394 563 322 Exterior milky milky milky milky milky milky milky milky mechanical stability no precipitation no precipitation no precipitation no precipitation no precipitation more precipitation precipitation Partial precipitation dilution stability Unlayered Unlayered Unlayered Unlayered Unlayered layered layered layered

[0061] image 3 For the large particle size aqueous polyurethane dispersion prepared in comparative example 1, after placing 1 hour, it just began to precipitate and stratify. Figure 4 It is a photo o...

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
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a large-particle-size waterborne polyurethane dispersion, which is prepared from the following raw materials in parts by mass: 50-100 parts of macromolecular dihydric alcohol, 0.5-1.5 parts of carboxylic acid type hydrophilic chain extender, 30-45 parts of diisocyanate, 2-4 parts of micromolecular alcohol chain extender, 0.3-1.5 parts of micromolecular amine chain extender, 0.05-0.1 part of catalyst, 0.5-1.5 parts of neutralizer, 25-100 parts of acetone, 50-125 parts of hydrophobic solvent, 0.5-1.5 parts of emulsifier and 150-200 parts of deionized water. The preparation method provided by the invention can be used for preparing the waterborne polyurethane dispersoid with a relatively large particle size, and the waterborne polyurethane dispersoid is good in dispersity, mechanical stability and dilution stability and does not generate precipitates or layers. The stability of the waterborne polyurethane dispersion is equivalent to that of a common waterborne polyurethane dispersion, and the application field of the waterborne polyurethane dispersion can be expanded.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane dispersions, and in particular relates to a large-diameter water-based polyurethane dispersion and a preparation method thereof. Background technique [0002] Water-based polyurethane dispersion is a kind of polyurethane resin that uses water as the dispersion medium. Due to the unique properties of polyurethane, as well as the characteristics of environmental protection and non-toxicity, water-based polyurethane dispersion is widely used in various fields. Waterborne polyurethane dispersions are generally prepared by the acetone method, and their particle size is small, generally <200nm. However, the large particle size waterborne polyurethane dispersion prepared by this method has poor stability and cannot meet some needs. Application of large particle size waterborne polyurethane dispersion fields, such as glass fiber film formers. Therefore, the preparation of large partic...

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): C08G18/66C08G18/42C08G18/44C08G18/34C08G18/32C08G18/08C08J3/03C08L75/06
CPCC08G18/6659C08G18/42C08G18/4202C08G18/44C08G18/348C08G18/3206C08G18/08C08J3/03C08J2375/06
Inventor 李有刚杜泽川谭鸿柏兴华冉忠祥
Owner 重庆中科力泰高分子材料有限公司
Features
  • R&D
  • 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