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Powdered water-based polyurethane and preparation method thereof

A water-based polyurethane and powder technology, applied in the field of water-based polyurethane, can solve problems such as complex processes, and achieve the effects of simple equipment requirements, simple production process, and simple synthesis process.

Active Publication Date: 2014-09-03
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process needs to be emulsified with water first, and then centrifugally settled to obtain powder, which is a complicated process

Method used

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  • Powdered water-based polyurethane and preparation method thereof
  • Powdered water-based polyurethane and preparation method thereof
  • Powdered water-based polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 14.8g (0.1mol) of dimethylolpropionic acid was dissolved in 50g of acetone, and 10.1g (0.1mol) of triethylamine was added for neutralization reaction. After 10min, the acetone was removed in vacuum to obtain an ionized hydrophilic chain extender , add 100g (0.1mol) molecular weight again and be the polyethylene glycol of 1000, 100g (0.05mol) molecular weight is the polyoxypropylene ether glycol of 2000, butanediol 10g (0.11mol), catalyst dibutyltin dilaurate 0.1 g, mixed evenly, vacuum dehydrated, added 80.2 g (0.36 mol) of isophorone diisocyanate (IPDI), heated at 60°C for 90 minutes, and crushed the solid to obtain water-based polyurethane powder.

[0023] Add the water-based polyurethane powder into tap water and stir to obtain the water-based polyurethane emulsion. Add 100 parts by mass of an emulsion with a solid content of 30% to 3 parts by mass of a water-based polyurethane curing agent to form an adhesive film. The properties are shown in Table 1.

Embodiment 2

[0025] Dissolve 14.8g of dimethylolpropionic acid in 50g of acetone, add 10.1g of triethylamine for neutralization reaction, after 10min, remove the acetone in vacuum to obtain an ionized hydrophilic chain extender, then add 100g (0.05mol) Molecular weight is the polyethylene glycol of 2000, and 100g molecular weight is the polyoxypropylene ether glycol of 2000, butanediol 10g, catalyst dibutyltin dilaurate 0.1g, mix homogeneously, vacuum dehydration, add toluene diisocyanate (TDI) 53.9 g (0.31mol), heated at 60°C for 90 minutes, and pulverized the solid to obtain water-based polyurethane powder.

[0026] The obtained powder is added into tap water and stirred to obtain a water-based polyurethane emulsion. Add 100 parts by mass of an emulsion with a solid content of 30% to 3 parts by mass of a water-based polyurethane curing agent to form an adhesive film. The properties are shown in Table 1.

Embodiment 3

[0028] 7.4g (0.05mol) of dimethylolbutyric acid was dissolved in 50g of acetone, and 5.05g (0.05mol) of triethylamine was added for neutralization reaction. After 10min, the acetone was removed in vacuum to obtain an ionized hydrophilic chain extender , add 100g molecular weight again and be the polyethylene glycol of 1000, 100g molecular weight is the polyoxypropylene ether glycol of 2000, catalyst dibutyltin dilaurate 0.1g, mix homogeneously, vacuum dehydration, add isophorone diisocyanate (IPDI ) 44.4g (0.20mol), heated at 60°C for 90min, and pulverized the solid to obtain water-based polyurethane powder.

[0029] Add the water-based polyurethane powder into tap water and stir to obtain the water-based polyurethane emulsion. Add 100 parts by mass of an emulsion with a solid content of 30% to 3 parts by mass of a water-based polyurethane curing agent to form an adhesive film. The properties are shown in Table 1.

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Abstract

The invention discloses a powdered water-based polyurethane and a preparation method thereof. The powdered water-based polyurethane is prepared from the following raw materials: 0.25-0.65 mol of polyisocyanate, 0.1-0.2 mol of hydrophilc agent, 0.05-0.2 mol of polyethyleneglycol, 0-0.15 mol of chain extender, 0.1-0.2 mol of triethylamine, 0.1-0.2 mol of polyalcohol, 10-30 wt% of solvent and 0.01-0.1 wt% of catalyst. The powdered water-based polyurethane can be emulsified by tap water when in use. The production technique is simple. The powdered water-based polyurethane is applicable to the fields of adhesives and paints.

Description

technical field [0001] The invention relates to a water-based polyurethane, in particular to a powder-type water-based polyurethane and a preparation method thereof. Background technique [0002] Water-based polyurethane is used more and more widely because it does not contain organic solvents and has no pollution to the environment, mainly in the fields of adhesives and coatings. Existing water-based polyurethanes generally exist in the form of emulsions, which require storage and transportation above 5°C, which increases the cost of storage and transportation. CN1418900A discloses a preparation method of water-based polyurethane powder material, mixing polyester diol and dimethylol propionic acid according to the hydroxyl ratio of 0.5 to 1.5, heating to 60 to 100°C for complete melting, vacuum dehydration, and then under nitrogen protection Add isocyanate with a ratio of 1.0 to 2.0 to the total hydroxyl content, react at 60 to 100°C for 2 to 3 hours, add acetone to dilute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42
CPCC08G18/0823C08G18/4808C08G18/4833C08G18/6674C08G18/6692
Inventor 付立成董火成赵修文
Owner LIMING RES INST OF CHEM IND
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