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Prepn process of water thinned polyurethane emulsion

A water-based polyurethane and emulsion technology, applied in the field of preparation of water-based polyurethane emulsion, can solve the problems of low tensile strength and elongation, etc.

Active Publication Date: 2006-03-01
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the previous data; the aqueous polyurethane dispersion produced by the prior art belongs to a kind of hard dispersion, and its tensile strength and elongation are all relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Put 40g polyneopentyl glycol adipate, 60g polytetrahydrofuran ether, 64g isophorone diisocyanate and 0.04g dilaurate into a 500ml flask equipped with a thermometer, stirrer, reflux condenser and dropping funnel Butyl tin, react at 78°C for 1 hour to obtain a prepolymer.

[0014] Subsequently, 12 g of dimethylol propionic acid containing a hydrophilic group and 15 g of co-solvent N-methylpyrrolidone were added, and reacted at 68° C. for 2 hours.

[0015] Then add 9g of triethylamine for neutralization, add the neutralized prepolymer solution into 340g of water to disperse, keep it for 10 minutes after adding, then add 3g of ethylenediamine to extend the chain, the feeding time is 13min, stir after adding After 30 minutes, a water-based polyurethane emulsion was prepared by defoaming and filtering, with a solid content of 33%, pH=7.4, viscosity of 30mPa·S, tensile strength of 40Mpa, and elongation at break of 450%.

Embodiment 2

[0017] In addition to adding 50g polyneopentyl glycol adipate, 50g polytetrahydrofuran ether, and 60g isophorone diisocyanate, the reaction temperature for preparing the prepolymer was 75°C, and 12g dimethylol propionic acid was added; 20g N-methyl Pyrrolidone was reacted at 70°C for 2 hours, and the prepolymer solution was added to 380 g of water for 25 minutes. 2.5g ethylenediamine chain extension, except that the feeding time is 10min, other operations are the same as in Example 1, and its solid content of the obtained aqueous polyurethane emulsion is 30%, pH=7.3, viscosity 10mPa S, tensile strength 15Mpa, an example Elongation 600%.

Embodiment 3

[0019] In addition to adding 30g polyneopentyl glycol adipate, 70g polytetrahydrofuran ether, and 71g isophorone diisocyanate, the reaction temperature for preparing the prepolymer is 80°C, and 18gN-methylpyrrolidone is reacted at 65°C for 2 hours. The prepolymer solution was added into 330g of water, and the addition time was 30min. 3g of diethylenetriamine was chain-extended, and the addition was completed within 15 minutes. Other operations were exactly the same as in Example 1. As a result, the solid content was 35%, the pH=7.5, the viscosity was 35mPa·S, the tensile strength was 50Mpa, and the elongation at break was 380%.

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Abstract

The preparation process of water thinned polyurethane emulsion includes the reaction of polyester polyols, polyether polyols and isophorone diisocyanate in the molar ratio between isophorone diisocyanate and the sum of polyester polyols and polyether polyols equal to 2.7-3.2 in the presence of dibutyl tin laurate catalyst at 75-80 deg.c for 1 hr to obtain pre-polymer; adding dihydroxymethyl propionic acid containing hydrophilic group and co-solvent N-methyl pyrrolidone to reaction for further 2 hr; neutralizing with triethylamine, dropping into water while adding amine chain expander, defoaming, and filtering to obtain the water thinned polyurethane emulsion. The water thinned polyurethane emulsion has solid content of 30-35 wt%, pH value of 6.5-8.0, viscosity of 10-50 MPa.S, etc.

Description

1. Technical field [0001] The present invention relates to a kind of preparation method of aqueous polyurethane emulsion 2. Background technology [0002] Water-based polyurethane emulsions, which have been developed rapidly in recent years, not only have superior properties such as high strength and wear resistance, but also have no pollution to the environment, and are green and environmentally friendly products. Due to the existence of urethane bonds and urea bonds in the molecules of waterborne polyurethane resins, the adhesive strength, toughness, abrasion resistance, chemical resistance and durability of waterborne polyurethane coatings are excellent, and developed countries are conducting vigorous research. [0003] The preparation method report of water-based polyurethane emulsion is also a lot, here only to the related patent U.S.Pat.5 of the present invention, 169,895, December 8, 1992. Technical characteristic is described. In the prior art, the polyester polyol ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/42C08G18/48C08G18/72C08G18/24C08J3/07
Inventor 范福庭沈剑张永德季天明
Owner SHANGHAI PLASTICS RES INST CO LTD
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