Preparation method of high-solid content waterborne polyurethane emulsion

A technology of water-based polyurethane with high solid content, which is applied in the field of preparation of high-solid content water-based polyurethane dispersion emulsion, which can solve the problems of high reactivity between amino groups and isocyanate, difficult control of the production process, uneven chain extension, etc., to ensure controllability and repeatability, mild and controllable chain extension process, enhanced uniformity and efficiency

Active Publication Date: 2017-06-06
SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the hydrophilic chain extenders used in this type of method are sulfamate chain extenders, mostly aqueous solutions, poor compatibility with polyurethane prepolymers, uneven chain extension, and low

Method used

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  • Preparation method of high-solid content waterborne polyurethane emulsion
  • Preparation method of high-solid content waterborne polyurethane emulsion
  • Preparation method of high-solid content waterborne polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 270g of polybutylene adipate diol (PBA) with a number average molecular weight of 2000 and a hydroxyl value of 56mg KOH / g was vacuum dehydrated at 110°C for 1.5h, cooled to 60°C, and 28.9g of Isophor was added Ketone diisocyanate (IPDI), 21.9g hexyl diisocyanate (HDI), under the protection of nitrogen, heat up to 90°C, and mechanically stir for 1.5h; then cool down to 55°C, add 0.22g of dibutyltin dilaurate, dilute solvent acetone 50g, continue to react at 70°C for 1.5h; then lower the temperature to 50°C, add 75g of diluting solvent acetone, keep the temperature of the prepolymer at 45°C, and prepare the pre-configured chain extender aqueous solution (take 1.25g N-amine ethylethanolamine, 13.2 g of 50% sodium ethylenediamine sulfonate aqueous solution and 10 g of deionized water were mixed uniformly) into the reaction system dropwise within 1 min, and kept at 45° C. for 25 min. Then add 250 g of diluting solvent acetone and stir for 20 minutes, then add water for high-...

Embodiment 2

[0048] 270g of polyneopentyl adipate diol (PNA) with a number average molecular weight of 2000 and a hydroxyl value of 56mg KOH / g was vacuum dehydrated at 110°C for 1.5h, cooled to 60°C, and 38.5g of isofor ketone diisocyanate (IPDI), 14.6g hexyl diisocyanate (HDI), under the protection of nitrogen, heat up to 90 ° C, mechanically stir the reaction for 1.5 h; then cool down to 55 ° C, add dibutyltin dilaurate 0.22 g, dilution solvent Acetone 45g, continue to react at 70°C for 1.5h; then cool down to 50°C, add 70g of diluting solvent acetone, keep the temperature of the prepolymer at 45°C, mix the pre-configured small molecular amine aqueous solution (take 1.00g ethylenediamine and 8g of deionized water (mixed uniformly) was added dropwise to the reaction system within 1min, and the reaction was continued for about 10min at 45°C, followed by the dropwise addition of 13.2g of 50% sodium ethylenediaminoethanesulfonate aqueous solution with controlled dropwise Adding time is 30-90...

Embodiment 3

[0050] 135g number average molecular weight is 2000, the polyadipate neopentyl glycol ester diol (PNA) of hydroxyl value 56mgKOH / g and 135g number average molecular weight is 2000, the polyadipate of hydroxyl value 56mgKOH / g Mix hexanediol ester diol (PHA) and vacuum dehydrate at 110°C for 1.5h, cool down to 60°C, add 57.8g of isophorone diisocyanate (IPDI), and raise the temperature to 90°C under nitrogen protection, mechanically Stir the reaction for 1.5h; then cool down to 55°C, add 0.22g of stannous octoate, 52g of diluting solvent acetone, and continue the reaction at 70°C for 1.5h; then cool down to 50°C, add 75g of diluting solvent acetone, and keep the temperature of the prepolymer at At 45°C, mix the pre-configured chain extender aqueous solution (take 1.30g of N-aminoethylethanolamine, 13.0g of 50% sodium ethylenediamine ethanesulfonate aqueous solution with a mass fraction of 50%, and 10g of deionized water to mix uniformly) for 1min Add it dropwise to the reaction ...

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Abstract

The invention discloses a preparation method of a high-solid content waterborne polyurethane emulsion, comprising the following steps: (A) reacting polymer polyhydric alcohol with diisocyanate, then adding a catalyst and a diluting solvent, reacting to obtain a polyurethane prepolymer; (B) adding the diluting solvent to the polyurethane prepolymer to obtain the diluted polyurethane prepolymer; (C) preparing a mixed water solution of small molecule amines and a sulphonate type hydrophilic chain-extending agent; (D) dropwise adding the mixed water solution of small molecule amines and the sulphonate type hydrophilic chain-extending agent to the diluted polyurethane prepolymer, then insulating; (E) adding the diluting solvent to the product of the step (D) at room temperature and mixing; and (F) adding water to the product of the step (E), emulsifying and dispersing to obtain the polyurethane emulsion, and removing the diluting solvent to obtain the high-solid content waterborne polyurethane emulsion. The high-solid content waterborne polyurethane emulsion has better storage stability, better hydrolysis resistance, better pH stability, high utilization rate of equipment and low transportation and drying costs.

Description

technical field [0001] The invention relates to a preparation method of high solid content aqueous polyurethane dispersion emulsion. Background technique [0002] As a high-performance polymer material, polyurethane has been widely used in coatings, adhesives, inks, leather processing, textiles and other fields. At present, solvent-based polyurethane is still widely used in industry, but the production and use of solvent-based polyurethane will bring a lot of environmental pollution and health hazards. Water-based polyurethane uses water as the dispersion medium, which has the advantages of non-toxic, non-flammable, and non-polluting, and inherits many excellent properties of solvent-based polyurethane materials. However, most domestic waterborne polyurethane products are currently designed with a solid content of 25-40%, which increases the cost of drying and transportation, while the research and development of high solid content waterborne polyurethane is becoming increa...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/38C08G18/42C08G18/48C08G18/66C08G18/73C08G18/75C08G18/32
CPCC08G18/10C08G18/4202C08G18/4238C08G18/4854C08G18/6651C08G18/6655C08G18/6662C08G18/6688C08G18/6696C08G18/73C08G18/755C08G18/3271C08G18/3855C08G18/3228
Inventor 陆银锋蒋红梅尚玥王焕宋海峰唐劲松
Owner SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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