Preparation method of solvent-free environment-friendly aqueous polyurethane emulsion with multi-model particle size distribution, high solid content, and low viscosity

A technology of water-based polyurethane with high solid content, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve problems such as poor water resistance

Inactive Publication Date: 2015-11-25
武汉强力荷新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of highly hydrophilic sulfonate, the water resistance is relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 is used as adhesive

[0030] Add polyethylene adipate diol into the reaction vessel, and vacuumize at 105-140°C for 1-4 hours. Then cool down to 60-90°C, add TDI, and react until the NCO content reaches the theoretical value (the NCO content is measured by the di-n-butylamine method); at a temperature of 60-90°C, add N,N-dimethylformaldehyde dissolved in a co-solvent The amide hydrophilic chain extender dimethylol propionic acid is chain extended, after heating and dissolving, add it to a four-neck flask, and react until the NCO content reaches the theoretical value; add a small molecule chain extender diethylene glycol to react for 1 hour, cool to 35~50℃, the alkali dissociation constant K b Dissolve n kinds of neutralizers (n is a natural number, n>1) with a difference of more than two orders of magnitude in a certain amount of deionized water in a certain proportion, slowly add them into the rapidly stirring polyurethane prepolymer, emulsify at a high s...

Embodiment 2

[0033] Embodiment 2 is used as printing water-based ink adhesive material and base material

[0034] Add polyethylene glycol phthalate to the reaction vessel, and vacuumize at 105-140°C for 1-4 hours. Then cool down to 60-90°C, add MDI, and react until the NCO content reaches the theoretical value (the NCO content is measured by the di-n-butylamine method); at a temperature of 60-90°C, add N,N-dimethylformaldehyde dissolved in a co-solvent The amide hydrophilic chain extender dimethylol propionic acid is chain extended, after heating and dissolving, add it to a four-neck flask, and react until the NCO content reaches the theoretical value; add a small molecule chain extender diethylene glycol to react for 1 hour, cool to 35~50℃, the alkali dissociation constant K b Dissolve n kinds of neutralizers (n is a natural number, n>1) with a difference of more than two orders of magnitude in a certain amount of deionized water in a certain proportion, slowly add them into the rapidly ...

Embodiment 3

[0037] Embodiment 3 is used as leather finishing agent or textile surface finishing agent film-forming substance

[0038] Add polypropylene glycol to the reaction vessel, and vacuumize at 105-140°C for 1-4 hours. Then cool down to 60-90°C, add HDI, and react until the NCO content reaches the theoretical value (the NCO content is measured by the di-n-butylamine method); at a temperature of 60-90°C, add N,N-dimethylformaldehyde dissolved in a co-solvent The amide hydrophilic chain extender dimethylol propionic acid is chain extended, after heating and dissolving, add it to a four-neck flask, and react until the NCO content reaches the theoretical value; add a small molecule chain extender diethylene glycol to react for 1 hour, cool to 35~50℃, the alkali dissociation constant K b Dissolve n kinds of neutralizers (n is a natural number, n>1) with a difference of more than two orders of magnitude in a certain amount of deionized water in a certain proportion, slowly add them into ...

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Abstract

The invention discloses a preparation method of solvent-free environment-friendly aqueous polyurethane emulsion with multi-model particle size distribution, a high solid content, and a low viscosity. The preparation method comprises the following steps: reacting polyol with a molecular weight of 400 to 5000 with diisocyanate to generate a prepolymer comprising a -NCO terminal group, then adding a hydrophilic chain extender to carry out chain extension, then adding micro-molecular dibasic alcohol to carry out chain extension, adding neutralizing agents with different alkali dissociation constants into a certain amount of deionized water according to a certain ratio, and then adding the neutralizing agents into the polyurethane prepolymer under high-speed stirring so as to obtain a milk-white emulsion product. The prepared aqueous polyurethane emulsion has a solid content of 60% or more, and has the advantages of low viscosity and high stability. At the same time, the added organic solvent is volatile, and the step of removing solvent is saved.

Description

technical field [0001] The invention relates to a polyurethane emulsion, in particular to a preparation method of an environment-friendly water-based polyurethane emulsion with high solid content, low viscosity, solvent-free, multiple particle size distribution, and low viscosity. The water-based polyurethane emulsion of the invention can be used in the fields of adhesives, coatings, leather finishing and the like. technical background [0002] Water-based polyurethane (WPU) has gradually replaced organic solvent-based polyurethane due to its safety and environmental protection. Its application in coatings, adhesives, inks and leather finishes has attracted much attention. Due to the advantages of film-forming performance, lower production and transportation costs, simpler equipment and processes, and higher utilization of equipment, high-solid content emulsions are increasingly valued by industries such as coatings and adhesives, and have become an important direction for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/10C08G18/08C08G18/48C09J175/06C09D11/102C09D175/08D06M15/568
Inventor 艾照全鲁艳蔡婷艾书伦
Owner 武汉强力荷新材料有限公司
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