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 solv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033]76g PBA3000 and 54g PCDL3000 were mixed and melted, 100g IPDI was added at 60°C, the temperature was raised to 80°C for 60min; the temperature was lowered to 60°C and the acetone solution of BDO (30g each of BDO and acetone) was added dropwise. Incubate the reaction at ℃ for 120min; cool to below 60℃, add 250g acetone, stir evenly and divide into three equal parts, denoted as A, B, C; add 5.6g, 6.4g, 8.0g to each of A, B, and C at room temperature The aqueous solution of sodium ethylenediamine ethanesulfonate (mass concentration is 50%, the same below) is subjected to a hydrophilic chain extension reaction for 30 min, and the A, B and C after the hydrophilic chain extension are remixed to obtain a mixed polyurethane ionomer. The ionomer was emulsified by adding 250g deionized water for 10min under high-speed stirring at 5000r / min, then slowly adding 1.1g butanediamine for post-chain extension, and continuing to stir at 500r / min for 30min; finally, at 5...

Example Embodiment

[0034] Example 2

[0035] Melt 150g PBA2000, add 7.5g IPDI and 13g HDI while stirring at 60℃, heat up to 75~80℃ and react for 120min, cool down to below 60℃, add 298g acetone, fully dissolve the prepolymer and divide it into two equal parts A and B , respectively, adding 5.8g and 8.6g aqueous solutions of sodium ethylenediamine ethanesulfonate to react for 20min, remixing A and B to obtain a mixed polyurethane ionomer, which was added with 170g deionized water under high-speed stirring at 7000r / min It was emulsified completely, and then 0.9 g of ethylenediamine was slowly added to carry out post-chain extension reaction for 20 min. The solvent removal method was the same as that in Example 1. The obtained aqueous polyurethane emulsion has a solid content of 50.18%, a viscosity of 177 mPa·s, an average particle size of 138 nm, and a volume fraction of small particle size of 32.7%.

Example Embodiment

[0036] Example 3

[0037] The difference between this example and Example 2 is that the mass of the reaction raw materials PBA2000, PCDL2000, HDI and TDI in this formula are 66g, 53g, 3.5g and 13g respectively, and the mass of the solvent acetone is 165g; After dissolving, it was divided into two equal parts, and 4.2g and 6.4g of aqueous solution of hydrophilic chain extender sodium 2,4-diaminobenzenesulfonate were added respectively, and the reaction time was 12min; 130g of deionized water was used, and ethylenediamine, a post-chain extender 1g. The obtained aqueous polyurethane emulsion has a solid content of 51.36%, a viscosity of 143 mPa·s, an average particle size of 355 nm, 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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