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Preparation method of degradable waterborne polyurethane paint and product

A technology of water-based polyurethane and coatings, which is applied in the field of preparation of degradable water-based polyurethane coatings, can solve the problems of not widely used marine coatings, and achieve the effects of convenient operation, cheap raw materials and simple process

Active Publication Date: 2016-09-07
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] With the development of nanotechnology, nanomaterials are used in various fields, but they are not widely used in marine coatings

Method used

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  • Preparation method of degradable waterborne polyurethane paint and product
  • Preparation method of degradable waterborne polyurethane paint and product
  • Preparation method of degradable waterborne polyurethane paint and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Vacuum-dry nano-titanium dioxide at 50°C for 24 h, fully mix 2.0 g of nano-titanium dioxide with 50 mL of anhydrous toluene, and disperse evenly by ultrasonic waves. Under the condition of nitrogen protection and constant temperature stirring at ℃ for 12 h, the hydroxyl group on the surface of nano-titanium dioxide initiates the ring-opening of lactide, and the titanium dioxide / polylactic acid composite material and anhydrous toluene mixture obtained by the reaction are added dropwise to 8 times the volume of n-hexane , and filtered under reduced pressure, the product was dried at 50°C for use. 2,2-Dihydroxymethylpropionic acid is dehydrated at 110°C, and polypropylene glycol is dehydrated at 110°C. Mix and stir 2.5 g of dry polypropylene glycol and 0.3 g of 2,2-dihydroxymethylpropionic acid, slowly add 0.25 g of toluene diisocyanate dropwise, and react at a constant temperature of 75°C for 8 h under nitrogen protection and strong stirring, then cool down After reachin...

Embodiment 2

[0032] Vacuum-dry nano-titanium dioxide at 50°C for 24 h, fully mix 2.0 g of nano-titanium dioxide with 50 mL of anhydrous toluene, and disperse evenly with ultrasonic waves. Under the condition of nitrogen protection and constant temperature stirring at ℃ for 12 h, the hydroxyl group on the surface of nano-titanium dioxide initiates the ring-opening of lactide, and the titanium dioxide / polylactic acid composite material and anhydrous toluene mixture obtained by the reaction are added dropwise to 8 times the volume of n-hexane , and filtered under reduced pressure, the product was dried at 50°C for use. 2,2-Dihydroxymethylpropionic acid is dehydrated at 110°C, and polypropylene glycol is dehydrated at 110°C. Mix and stir 2.5 g of dry polypropylene glycol and 0.3 g of 2,2-dihydroxymethylpropionic acid, slowly add 0.5 g of toluene diisocyanate dropwise, and react at a constant temperature of 75°C for 10 h under nitrogen protection and strong stirring, then cool down After reach...

example 3

[0034] Vacuum-dry nano-titanium dioxide at 50°C for 24 h, fully mix 2.0 g of nano-titanium dioxide with 50 mL of anhydrous toluene, and disperse evenly by ultrasonic waves. Under the condition of nitrogen protection and constant temperature stirring at ℃ for 12 h, the hydroxyl group on the surface of nano-titanium dioxide initiates the ring-opening of lactide, and the titanium dioxide / polylactic acid composite material and anhydrous toluene mixture obtained by the reaction are added dropwise to 8 times the volume of n-hexane , and filtered under reduced pressure, the product was dried at 50°C for use. 2,2-Dihydroxymethylpropionic acid is dehydrated at 110°C, and polypropylene glycol is dehydrated at 110°C. Mix and stir 5.0 g of dry polypropylene glycol and 0.6 g of 2,2-dihydroxymethylpropionic acid, slowly add 0.5 g of toluene diisocyanate dropwise, and react at a constant temperature of 75°C for 12 h under nitrogen protection and strong stirring, then cool down After reachin...

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Abstract

The invention discloses a method for preparing degradable waterborne polyurethane paint. The method comprises the steps that waterborne polyurethane is modified by nano titanium dioxide, wherein the water resistance, the mechanical property and the like of waterborne polyurethane can be improved through the special characters such as the surface and interface effect, the quantum size effect and the macroscopic quantum tunneling effect of the titanium dioxide particles, and meanwhile attachment of microorganisms to the surface of a coating can be effectively reduced through the antibacterial property of nano titanium dioxide; polylactic acid is connected to the surface of nano titanium dioxide, and then the waterborne polyurethane coating with the biodegradablity is prepared. According to the method, a -NCO terminal is prepared through the connection function of a toluene diisocynate functional group -NCO to be connected with a titanium dioxide-polylactic acid composite coating, the purpose of modifying waterborne polyurethane is achieved, polylactic acid is soft in main chain and can be easily catabolized by microorganisms in the natural world, a decomposition product is free of pollution, and the microorganisms attached to the surface are effectively removed; nano titanium dioxide has the excellent antibacterial and bactericidal characteristics, attachment of fouling organisms is greatly reduced, and the surface cleanliness of the coating is kept.

Description

technical field [0001] The invention belongs to the field of polymer nanocomposite materials, and relates to a preparation method of degradable waterborne polyurethane coating. technical background: [0002] In the process of human development and utilization of marine resources, marine fouling organisms have become a major problem hindering the development of marine economy. Once such organisms attach to the bottom of the ship, it will slow down the ship's navigation speed, increase resistance, and waste fuel; corrode the metal surface coating, accelerate metal aging, and reduce the service life of the ship; dealing with attachments on the ship's surface consumes a lot of manpower material resources, causing huge economic losses; in addition, once the ship enters a new ocean area, it will cause the invasion of alien species and cause damage to the marine ecosystem. Therefore, it is imminent to solve the problems caused by marine fouling organisms. [0003] So far, the mos...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/34C08G18/42C08G18/48C08G18/66C08K3/22
CPCC08G18/12C08G18/348C08G18/4018C08G18/428C08G18/4825C08G18/6692C08K3/22C08K2003/2237C08K2201/011
Inventor 欧宝立王向刘俊成周虎易守军周智华
Owner HUNAN UNIV OF SCI & TECH
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