Crosslinked sulfonate carboxylate aqueous polyurethane emulsion and preparation method thereof

A technology of water-based polyurethane and sulfonic acid carboxylate, which is applied in the field of synthesis of water-based resins, and can solve problems affecting the cohesive energy and water resistance of water-based polyurethane films

Active Publication Date: 2019-01-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, when preparing carboxylic acid type and sulfonic acid type water-based polyurethane emulsion, trimethylolpropane crosslinking agent is mostly added, which affects the cohesive energy and water resistance of the prepared water-based polyurethane film.

Method used

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  • Crosslinked sulfonate carboxylate aqueous polyurethane emulsion and preparation method thereof
  • Crosslinked sulfonate carboxylate aqueous polyurethane emulsion and preparation method thereof
  • Crosslinked sulfonate carboxylate aqueous polyurethane emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] a. Main reaction raw materials and proportion composition:

[0072] raw material

mass (g)

millimole (mmol)

Isophorone diisocyanate

6.68

30

N-tris(hydroxymethyl)methyl-2-aminoethanesulfonic acid monosodium salt

0.60

2.38

Dimethylolpropionic acid

1

7.4

1,4-Butanediol

1.02

11.3

Triethylamine

0.75

7.4

Dibutyltin dilaurate

0.12

0.2

water

20

1111

Polytetrahydrofuran ether glycol

6.14

6.1

[0073] The reaction raw material diisocyanate is isophorone diisocyanate, the trifunctional sulfonate is N-tris(hydroxymethyl)methyl-2-aminoethanesulfonic acid monosodium salt, and the hydrophilic chain extender is dimethylol Propionic acid, small molecule chain extender is 1,4-butanediol, salt forming agent is triethylamine, organotin catalyst is dibutyltin dilaurate, deionized water, macromolecule glycol is polytetrahydrofuran ether diol Alcohols, their molar ratio...

Embodiment 2

[0081] Embodiment 2 differs from Example 1 in that: polytetrahydrofuran ether glycol (PTMG Mn=1000) added in step b is changed to molecular weight and is the polycaprolactone glycol of 1000g / mol, and other processes do not Change, obtain a kind of stable blue translucent cross-linked sulfonic acid carboxylate water-based polyurethane emulsion, wherein the water-based polyurethane macromolecular segment nano-spherical colloid particle diameter is 42nm, molecular weight is 12800, and mass percent is solid content is 44%, the water absorption rate of the water-based polyurethane film after drying into a film is 19.4%, the tensile strength is 10.6MPa, and the elongation at break is 220%.

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Abstract

The invention relates to a crosslinked sulfonate carboxylate aqueous polyurethane emulsion, which is prepared by macromolecular diol, diisocyanate, a hydrophilic chain extender, small molecule diol, aneutralizing agent, trifunctional sulfonate, and deionized water, under the conditions of high-speed stirring and emulsification, bifunctional small-molecular trifunctional sulfonate having both hydrophilicity and cross-linking property is added, and by instead of a conventional technology of separately adding sulfonate and a trimethylolpropane cross-linking agent, the method of the invention prepares the stable blue translucent environmentally friendly aqueous polyurethane emulsion. The aqueous polyurethane macromolecular chain segment nano-spherical colloidal particle has a particle size of20 to 100 nm, a molecular weight of 12,000 to 30,000, and a mass percentage which is the solid content of 35% to 45%. After drying and film forming, the film has a water absorption of 6 to 8%, a tensile strength of 10 to 15 MPa, and an elongation at break of 170% to 250%.

Description

technical field [0001] The invention relates to the synthesis of water-based resins, in particular to a cross-linked sulfonic acid carboxylate water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] In April 2017, the Ministry of Environmental Protection announced the "Emission Standards for Air Pollutants in the Coatings, Inks and Adhesives Industry (Draft for Comment)" (Huanban Qihan [2017] No. 565), stipulating the VOCs emission standards for the adhesives and coatings industry 80g / L. National laws and regulations have strengthened environmental protection, and traditional polyurethane will produce a large amount of VOCs gas during use, which will pollute people and the environment. Water-based polyurethane uses water as the dispersion medium, has the advantages of low VOCs, good compatibility, easy modification, safe and reliable transportation and storage, and is widely used in coatings, wood coatings, adhesives and other indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/42C08G18/10C08G18/32C08G18/34
CPCC08G18/10C08G18/4277C08G18/4854C08G18/755C08G18/3206C08G18/348C08G18/3857
Inventor 刘跃进朱建涛吴志民熊迪梁忠李程坦
Owner XIANGTAN UNIV
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