Method for preparing waterborne polyurethane emulsion with high solid content

A technology of water-based polyurethane with high solid content, applied in the field of water-based polyurethane, can solve the problems that the solid content of water-based polyurethane is difficult to increase, and achieve the effects of good stability, high solid content and low viscosity

Active Publication Date: 2014-07-02
HANGZHOU TRANSFAR FINE CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical defect that the solid content is difficult to increase in the preparation of water-based polyurethane by the common internal emulsification method, the present invention provides a method for preparing a high-solid content water-based polyurethane emulsion, It prepares water-based polyurethane emulsion with high solid content by controlling the thickness of the hydration layer, so that the water-based polyurethane emulsion has the characteristics of thin hydration layer, high solid content, low viscosity, and good dispersion stability. It can be used in the furniture industry, artificial leather industry and adhesives Industry and other fields with high requirements on environmental protection, energy consumption and construction conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 50g of polybutylene adipate diol with a molecular weight of 500 was vacuum dehydrated at 110°C for 1.5h, cooled to 65°C, added 39g of TDI, stirred for 0.5h under nitrogen protection, and added 0.015g of dibutyltin dilaurate , react at 80°C for 2h; add 5g DMPA, 1g 1,4-butanediol, 2g neopentyl glycol, 10g butanone, 5g N-methylpyrrolidone, react at 80°C for 3h, cool down to 50 ℃, to obtain a clear and transparent viscous prepolymer A, which is composed of 15g 500 molecular weight polybutylene adipate diol, 9g TDI, 0.005g dibutyltin dilaurate, 0.3g 1,4-butanediol, 0.6g of neopentyl glycol, 3g of methyl ethyl ketone, and 1.5g of N-methylpyrrolidone were mixed evenly with the prepolymer B obtained by the same steps, added 3.7g of TEA for neutralization, and dispersed in the Add 3 g of ethylenediamine to 110 g of deionized water, then extend the chain, stir for 1 h, remove the solvent under reduced pressure, and obtain a water-based polyurethane emulsion with high solid conten...

Embodiment 2

[0021] 300g of polypropylene glycol with a molecular weight of 4000 was vacuum dehydrated at 110°C for 1h, cooled to 65°C, added 66g of TDI, stirred for 0.5h under nitrogen protection, added 0.08g of stannous octoate, and reacted for 3h at 80°C; added 15g DMPA, 3g 2-methylpropanediol, 2g 3-methylpentanediol, 50g butanone, reacted for 2h at 80°C, and cooled to 55°C to obtain a clear and transparent viscous prepolymer A, which was mixed with 200g 4000 Molecular weight polypropylene glycol, 28g TDI, 0.04g stannous octoate, 3g 2-methylpropanediol, 2g 3-methylpentanediol, and 50g butanone were mixed evenly with the prepolymer B obtained by reacting in the same steps, and then added 11g TEA to neutralize , dispersed in 330g of deionized water under high-speed stirring at 800~2000r / min, added 10.2g of pentamethylenediamine to extend the chain, stirred for 1 hour, and removed the solvent under reduced pressure to obtain a water-based polyurethane emulsion with high solid content.

Embodiment 3

[0023]50g of polybutylene adipate diol with a molecular weight of 500 was dehydrated under vacuum for 1.5h at 110°C, cooled to 65°C, added 50g of IPDI, stirred for 0.5h under nitrogen protection, added 0.02g of stannous octoate, and At 80°C, react for 2h; add 5g DMPA, 1g 1,4-butanediol, 2g neopentyl glycol, 10g butanone, 5g N-methylpyrrolidone, react at 80°C for 3h, cool down to 50°C, Obtain clear and transparent viscous prepolymer A, and by 50g 500 molecular weight polybutylene adipate diol, 38g IPDI, stannous octoate 0.02g, 1g 1,4-butanediol, 2g neopentyl glycol , 10g methyl ethyl ketone, 5g N-methylpyrrolidone, mix the prepolymer B obtained by the same steps, add 3.7g TEA to neutralize, disperse in 135g deionized water under high-speed stirring at 800~2000r / min, add 8g Hexamethylenediamine was followed by chain extension, stirred for 1 h, and the solvent was removed under reduced pressure to obtain a water-based polyurethane emulsion with high solid content.

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PUM

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Abstract

The invention discloses a method for preparing a waterborne polyurethane emulsion with high solid content. An existing preparation method has a limited promotion effect on the solid content of the waterborne polyurethane emulsion. Waterborne polyurethane emulsion particles with high solid content have core-shell structures with different hydrophilic properties. The preparation method of the waterborne polyurethane emulsion particles comprises the steps of dehydrating polymer polyol; enabling the dehydrated polymer polyol to react with diisocyanate, a hydrophilic chain extender and a micro-molecular chain extender to obtain a viscous pre-polymer A; uniformly mixing the pre-polymer A and a pre-polymer B which does not contain hydrophilic monomers, or contains fewer hydrophilic monomers, and is synthesized according to the same step; neutralizing by adding a neutralizer; dispersing into deionized water under high-speed stirring; performing chain extension with a subsequent chain extender to obtain the waterborne polyurethane emulsion with the high solid content. The waterborne polyurethane emulsion with high solid content has the advantages of thin hydration layer, low viscosity, good stability and high solid content; the preparation method of the waterborne polyurethane emulsion with high solid content has the advantages of unlimited formulas and raw materials, wide adaptability, simple and feasible process and strong controllability.

Description

technical field [0001] The invention relates to the field of water-based polyurethane, in particular to a method for preparing a high-solid content water-based polyurethane emulsion. Background technique [0002] Solvent-based polyurethane is widely used in the surface protection of wood products, adhesives, artificial leather and other fields due to its excellent performance. The environment is polluted. [0003] In recent years, countries around the world have gradually paid attention to the hazards of volatile organic compounds (VOC) in organic waste gas. The regulations on VOC control have become increasingly stringent. Some western developed countries have clearly stipulated the types and amounts of organic compounds emitted. Different from solvent-based polyurethane, water-based polyurethane uses water as the medium. Water is non-flammable, non-explosive, non-toxic, tasteless, does not pollute the environment, and has good construction conditions, safe production and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/12
CPCC08G18/0823C08G18/12C08G18/3206C08G18/348C08G18/4238C08G18/4804C08G18/4825C08G18/4854C08G18/664C08G18/6659C08G18/6674C08G18/6692C08G18/3228C08G18/3234C08G18/3231C08G18/3848
Inventor 王小君余冬梅王胜鹏蒋文佳
Owner HANGZHOU TRANSFAR FINE CHEM CO LTD
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