Preparation method of aqueous polyurethane emulsion with high solid content

A technology of water-based polyurethane and high solid content, which is applied in the field of preparation of high-solid content water-based polyurethane emulsion, can solve the problems of harming the health of users, slow volatilization speed, etc., and achieve the effects of improving efficiency, improving comprehensive performance and wide adjustment range.

Inactive Publication Date: 2011-10-19
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, some water-based polyurethane products use a large amount of high-boiling and expensive solvents in the preparation process, such as nitrogen methyl pyrrolidone (Nanda A K, Wicks D A, Madbouly S A, et al. J Appl Polym Sci, 2005, 98(6 ): 2514-2520), although the introduction of this kind of solvent makes the preparation process relative

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add PBA (40g), IPDI (9.18g) and acetone (accounting for 4% of the mass of the prepolymer) into a 500ml reactor, stir evenly at 60°C, then add the catalyst, raise the temperature to 70°C for 1.5 hours; Add DEG (1.07g) and acetone (accounting for 6-8% of the mass of the prepolymer), and react at a constant temperature for 1.5 hours; add DMPA (2.63g) dissolved in DMF to the system, stir evenly, and raise the temperature to 75°C, and keep the temperature at 1.5 hours; add IPDI (4.59g), raise the temperature to 85°C, and keep the temperature constant for 2 hours; cool down to 60°C, add TEA (1.94g) for neutralization, then add deionized water for water dispersion, and the stirring speed is 900-1500r / min; A 20% aqueous solution of ethylenediamine (2.57 g) was added for post-chain extension. After stirring at constant temperature for 1.5 hours, the solvent was removed under reduced pressure to obtain an aqueous polyurethane emulsion. The average particle size of the product is ...

Embodiment 2

[0045] Add PBA (40g), IPDI (9.18g) and acetone (accounting for 4% of the mass of the prepolymer) into a 500ml reactor, stir evenly at 60°C, then add the catalyst, raise the temperature to 70°C for 1.5 hours; Add BDO (0.95g) and acetone (accounting for 6-8% of the mass of the prepolymer) and react at a constant temperature for 1.5 hours; add DMPA (2.21g) dissolved in DMF to the system, stir evenly and raise the temperature to 75°C, and keep the temperature at 1.5 hours; add H 12 MDI (4.33g), heat up to 85°C, keep the temperature for 2 hours; cool down to 60°C, add TEA (1.59g) for neutralization, then add deionized water for water dispersion, stirring speed is 900-1500r / min; add mass fraction 20% aqueous solution of ethylenediamine (2.11 g) was used for post-chain extension. After stirring at constant temperature for 1.5 hours, the solvent was removed under reduced pressure. The average particle diameter of the obtained water-based polyurethane emulsion product is 200nm, and th...

Embodiment 3

[0049] PNA (40g), H 12 Add MDI (10.48g) and acetone (accounting for 4% of the mass of the prepolymer) into a 500ml reactor, stir evenly at 60°C, then add the catalyst, raise the temperature to 70°C and react for 1.5 hours; add BDO (0.77g) to the system and acetone (accounting for 6-8% of the mass of the prepolymer), react at a constant temperature for 1.5 hours; add DMPA (3.03g) dissolved in DMF to the system, stir evenly and then raise the temperature to 75°C, and keep the temperature at a constant temperature for 1.5 hours; add XDI (4.33 g), heat up to 85°C, keep the temperature constant for 2 hours; cool down to 60°C, add TEA (2.21g) for neutralization, then add deionized water for water dispersion, stirring speed is 900-1500r / min; adding mass fraction is 20% The aqueous solution of ethylenediamine (3.46g) was post-chain extended, stirred at constant temperature for 1.5 hours, and the solvent was removed under reduced pressure to obtain an aqueous polyurethane emulsion with...

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Abstract

The invention relates to a preparation method of an aqueous polyurethane emulsion with a high solid content. The method comprises the following steps: first, adding polymer polyol, polyisocyanates, catalyst and chain extender into a reactor according to certain steps, and controlling hydrophilic groups to distribute on molecular chain ends; then adding polyisocyanates to form a performed polymer terminated with an NCO group; then reducing system temperature, adding a neutralizer for neutralization, adding deionized water, and stirring with high speed to carry out water dispersion; at last, adding a post chain extender to carry out chain extension in water; removing the solvents under a reduced pressure after reaction to obtain the aqueous polyurethane emulsion. According to the invention, hydrophilic efficiency of the hydrophilic groups is raised to lower intake amount of hydrophilic groups, and a small amount of solvents are added in the reaction to lower a system viscosity. The aqueous polyurethane emulsion prepared by the invention has characteristics of high solid content, low viscosity, good water resistance and stabile storage, and can be used in industries of paint, adhesive, leather finishing and fabric arrangement, etc.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane, in particular to a preparation method of high-solid content water-based polyurethane emulsion. Background technique [0002] Solvent-based polyurethane products are widely used in coatings, adhesives and other fields due to their superior performance. However, a large amount of volatile organic compounds (VOC) will volatilize into the atmosphere during the film forming process, causing environmental pollution. Therefore, the development of environmentally friendly polyurethane products has attracted increasing attention. Water-based polyurethane emulsion uses water instead of traditional organic solvents as the dispersion medium of the system. It not only has the excellent properties of solvent-based polyurethane such as low temperature resistance, good flexibility, and high bonding strength, but also can significantly reduce or even completely eliminate VOC pollution to the env...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/12C08G18/32
Inventor 张卫英张伟李晓
Owner FUZHOU UNIV
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