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High-solid content waterborne polyurethane emulsion with particle size polydispersity and preparation method thereof

A polyurethane emulsion, polydispersity technology, applied in the field of preparation of water-based polyurethane emulsion, can solve the problems of low solid content, high viscosity, single particle size distribution, etc., and achieve the effect of wide application range

Inactive Publication Date: 2013-10-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above problems, the present invention provides a method for preparing a high-solid aqueous polyurethane emulsion with particle size polydispersity, which solves the problem of low solid content and high viscosity of aqueous polyurethane emulsion products currently on the market due to single particle size distribution. technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Mix 76g PBA3000 and 54g PCDL3000 and melt, add 100g IPDI at 60°C, raise the temperature to 80°C for 60min; Insulate and react at ℃ for 120 minutes; cool down to below 60℃, add 250g of acetone, stir evenly and divide into three equal parts, denoted as A, B, C; add 5.6g, 6.4g, 8.0g to A, B, C at room temperature An aqueous solution of sodium ethylenediaminoethanesulfonate (mass concentration is 50%, the same below) is subjected to a hydrophilic chain extension reaction for 30 minutes, and A, B and C after the hydrophilic chain extension are remixed to obtain a mixed polyurethane ionomer. The ionomer was emulsified by adding 250g of deionized water for 10min under high-speed stirring at 5000r / min, then slowly adding 1.1g of butanediamine for post-chain extension, and continued stirring for 30min at 500r / min; The solvent was removed such that the residual solvent content was less than 1%. The solid content of gained water-based polyurethane emulsion is 50.99%, viscosity 132...

Embodiment 2

[0035] Melt 150g of PBA2000, add 7.5g of IPDI and 13g of HDI while stirring at 60°C, raise the temperature to 75-80°C and react for 120min, cool down to below 60°C, add 298g of acetone, fully dissolve the prepolymer and divide into two equal parts A and B , respectively add 5.8g and 8.6g of sodium ethylenediamine sulfonate aqueous solution to react for 20min, remix A and B to obtain a mixed polyurethane ionomer, and add 170g of deionized water to the ionomer under high-speed stirring at 7000r / min After emulsifying it completely, slowly add 0.9 g of ethylenediamine to carry out post-chain extension reaction for 20 minutes, and the solvent removal method is the same as in Example 1. The obtained aqueous polyurethane emulsion had a solid content of 50.18%, a viscosity of 177mPa·s, an average particle size of 138nm, and a small particle size volume fraction of 32.7%.

Embodiment 3

[0037] The difference between this embodiment and Example 2 is that the quality of the reaction raw materials PBA2000, PCDL2000, HDI, and TDI in this formula is 66g, 53g, 3.5g, and 13g respectively, and the quality of the solvent acetone is 165g; Divide into two equal parts after dissolving, add 4.2g and 6.4g of the aqueous solution of hydrophilic chain extender sodium 2,4-diaminobenzenesulfonate respectively, and the reaction time is 12min; 1g. The obtained aqueous polyurethane emulsion has a solid content of 51.36%, a viscosity of 143mPa·s, an average particle size of 355nm, and a small particle size volume fraction of 15.2%.

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Abstract

The invention relates to a high-solid content waterborne polyurethane emulsion with particle size polydispersity and a preparation method thereof, belonging to the technical field of high polymer materials. The preparation method comprises the following steps of: preparing a polyurethane prepolymer, diluting the synthesized polyurethane prepolymer by adding a solvent, then dividing the diluted polyurethane prepolymer into a plurality of portions, respectively adding different doses of sulfonate hydrophilic chain extender to the different portions of polyurethane prepolymer for remixing, dispersing the mixtures to deionized water, carrying out secondary chain extension and removing the solvent from the emulsion in vacuum, thus obtaining the waterborne polyurethane emulsion with the solid content being higher than or equal to 50%. The preparation method has the advantages that a catalyst is not needed, the production time is short, and the process is simple and easy to control. The prepared waterborne polyurethane emulsion is relatively wide in particle size distribution and relatively low in viscosity and can be applied to the fields of environment-friendly coatings, adhesives and the like.

Description

technical field [0001] The invention relates to the preparation of a water-based polyurethane emulsion, in particular to a preparation method of the water-based polyurethane emulsion with wide particle size distribution, high solid content and low viscosity. Background technique [0002] Solvent-based polyurethanes cause great harm to the environment and human body due to the large amount of organic solvents used, while water-based polyurethanes can not only greatly reduce the damage of organic solvents to the environment, but also save resources and energy. With the increasingly stringent environmental protection regulations around the world, water-based polyurethane has been gradually used in water-based adhesives, coatings, inks and other fields, and the market prospect is very broad. At present, the solid content of commercially available water-based polyurethane emulsions generally does not exceed 45%. The low solid content increases the packaging and transportation cos...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/44C08G18/32C08G18/12C08G18/10
Inventor 夏正斌曹高华张燕红
Owner SOUTH CHINA UNIV OF TECH
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