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A kind of method that glucose and castor oil mixture prepares aqueous polyurethane film former

A water-based polyurethane, castor oil technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of generating three wastes, high cost of polyols, large energy consumption, etc., and achieves simple implementation, improved water resistance, and high profits. Effect

Active Publication Date: 2021-02-02
SHANDONG YILI OIL PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is that the cost of polyols in the main film-forming materials of water-based polyurethane coatings on the market is high, and the process of producing polyols by petroleum cracking consumes a lot of energy and produces more three wastes. The method of extracting the mixture of castor oil and glucose instead of petroleum polyol to synthesize water-based polyurethane

Method used

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  • A kind of method that glucose and castor oil mixture prepares aqueous polyurethane film former
  • A kind of method that glucose and castor oil mixture prepares aqueous polyurethane film former

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Prepare a mixture of glucose and castor oil as follows to prepare water-based polyurethane:

[0013] First prepare the mixture of glucose and castor oil, first dissolve 25g of glucose in 200ml of absolute ethanol, stir to make it fully dissolved, slowly add it dropwise to 300ml of castor oil for esterification reaction, react at 85°C for 2h, adjust glucose and castor oil The molar ratio of sesame oil is 0.8:5; after the reaction, vacuumize with a rotary evaporator to remove anhydrous ethanol, and vacuum-dry at 35°C to obtain a mixture of carboxyl-containing glucose and castor oil. Then dissolve 20g of 2,4-toluene diisocyanate (TDI) in 100ml of cyclohexanone, heat the oil bath to 80°C and stir it with a magnetic force, add the mixture of glucose and castor oil, TDI in the ratio of 1:3, dropwise add The total mass of the catalyst is about 0.02%, and the reaction is continued under nitrogen protection; 1% acetic acid is added, and the reaction is continued for 1.5h; the te...

Embodiment 2

[0021] Prepare a mixture of glucose and castor oil as follows to prepare water-based polyurethane:

[0022] First prepare the mixture of glucose and castor oil, first dissolve 30g of glucose in 200ml of absolute ethanol, stir to make it fully dissolved, slowly add it dropwise to 400ml of castor oil for esterification reaction, react at 85°C for 2h, adjust glucose and castor oil The molar ratio of sesame oil is 1:5; after the reaction, vacuumize with a rotary evaporator to remove absolute ethanol, and then vacuum-dry at 35°C to obtain a mixture of carboxyl-containing glucose and castor oil. Then dissolve 15g of 2,4-toluene diisocyanate (TDI) in 100ml of cyclohexanone, heat the oil bath to 80°C and stir it with a magnetic force, add the mixture of glucose and castor oil and TDI in the ratio of 2:3, add the The total mass of the catalyst is about 0.03%, and the reaction is continued under nitrogen protection; 1% acetic acid is added, and the reaction is continued for 2 hours; the...

Embodiment 3

[0030] Prepare a mixture of glucose and castor oil as follows to prepare water-based polyurethane:

[0031] First prepare the mixture of glucose and castor oil, first dissolve 20g of glucose in 200ml of absolute ethanol, stir to make it fully dissolved, slowly add it dropwise to 400ml of castor oil for esterification reaction, react at 85°C for 2h, adjust glucose and castor oil The molar ratio of sesame oil is 2:5; after the reaction, vacuumize with a rotary evaporator to remove anhydrous ethanol, and vacuum-dry at 35°C to obtain a mixture of carboxyl-containing glucose and castor oil. Then dissolve 40g of 2,4-toluene diisocyanate (TDI) in 100ml of cyclohexanone, heat the oil bath to 80°C and stir it with a magnetic force, add the mixture of glucose and castor oil and TDI in a ratio of 1:3, add the The total mass of the catalyst is about 0.02%, and the reaction is continued under nitrogen protection; 1% acetic acid is added, and the reaction is continued for 1.5h; the temperat...

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Abstract

The invention discloses a method for preparing a water-based polyurethane film-forming material from a mixture of glucose and castor oil. First, 2,4-toluene diisocyanate is dissolved in cyclohexanone, and the oil bath is heated to 80° C. and stirred with a magnetic force, according to 1:( Add the mixture of glucose and castor oil, 2,4-toluene diisocyanate in the ratio of 2~5), add dropwise the catalyst accounting for 0.02~0.03% of the total mass, and continue the reaction under nitrogen protection; add 1% acetic acid, and continue the reaction 1 ~2h; cool down to 60~65°C, then add 2.0%~4.0% water-based chain extender dimethylolpropionic acid in total mass, react for 2~3h, cool down to 30~40°C to obtain waterborne polyurethane prepolymer ; Neutralize the obtained prepolymer with a neutralizer, then add water for high-speed emulsification, and distill off the solvent under reduced pressure to obtain a water-based polyurethane film-forming substance. The invention is simple to implement, low in energy consumption, can obtain water-based polyurethane with better performance at a lower cost, greatly improves the performance of the water-based polyurethane coating, creates higher profits for enterprises, and has better popularization and application value.

Description

technical field [0001] The invention relates to the field of anti-corrosion coatings, in particular to a method for preparing a water-based polyurethane film-forming material from a mixture of glucose and castor oil. Background technique [0002] Polyurethane resin is usually synthesized by the reaction of polyisocyanate and polyol. The coating with polyurethane as the main film-forming substance has excellent adhesion, wear resistance, high gloss and other properties, and has become one of the most widely used coatings in the market. With the improvement of people's awareness of environmental protection, a series of environmental problems caused by the preparation and use of polyurethane have also attracted people's attention. Solvent-based polyurethane can no longer meet the needs of social development. [0003] Water-based polyurethane uses abundant and cheap water as the dispersion medium. Compared with solvent-based coatings, it has the advantages of odorlessness, non-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/67C08G18/34C08G18/32C09D175/14
CPCC08G18/3218C08G18/348C08G18/36C08G18/7614C09D175/14
Inventor 王绍飞郭凯李伟华樊伟杰
Owner SHANDONG YILI OIL PAINT
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