Preparation method of waterborne polyurethane

A technology for water-based polyurethane and polyester diol, applied in the field of chemical synthesis, can solve the problems of difficult control of the preparation process of water-based polyurethane and the use of sulfonic acid type chain extenders, etc., and achieves easy large-scale production, high solid content, Good dispersion stability
CN104910342AInactive Publication Date: 2015-09-16DONGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DONGHUA UNIV
Publication Date
2015-09-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a preparation method of waterborne polyurethane. The preparation method of the water polyurethane is characterized by comprising the first step of adding diisocyanate and chain extender into the polyether glycol or / and polyester dihydric alcohol, stirring and reacting for 1-4 hours at the temperature of 70-80 DEG C, reducing the temperature to 30-40 DEG C, adding the neutralizer for neutralizing, adjusting the viscosity with acetone and obtaining the prepolymer; and the second step of adding distilled water, stirring for emulsion dispersion, adding sulfoacid chain extender, stirring and reacting for 0.5-4 hours, conducting the reduced pressure distillation, removing acetone and obtaining the waterborne polyurethane. The prepared novel waterborne polyurethane is high in strength, good in stability of emulsion dispersion, simple in operation technology, friendly for environment and easy for large-scale production.
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Description

technical field

[0001] The invention relates to a preparation method of water-based polyurethane, which belongs to the technical field of chemical synthesis. Background technique

[0002] Since its industrialization in the 1990s, water-based polyurethane has been widely used in the textile and leather processing industries due to its excellent performance. With the strengthening of people's awareness of environmental protection and environmental protection laws and regulations, the research and development of environmentally friendly water-based polyurethane has been paid more and more attention, and it is gradually occupying the market of solvent-based polyurethane, which represents the development direction of coatings and adhesives.

[0003] At present, the most commonly used anionic chain extender 2,2-dimethylolpropionic acid (DMPA) is used to prepare carboxylate-type waterborne polyurethane in industry. The following formula is the molecular structural formula of DMPA:...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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