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Application of chitosan guanidine cationic waterborne polyurethane in preparation of antibacterial coating layer

A technology of cationic polyurethane and water-based polyurethane, applied in application, coating, anti-fouling/underwater coating, etc., can solve problems such as human injury, atmospheric damage, violation of the concept of sustainable development, etc., and achieve reduction of VOC emissions and operation methods Simple and easy to implement, reducing the impact on the environment and human health

Inactive Publication Date: 2020-04-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volatile organic solvents (Volatile Organic Compounds, VOC) contained in oil-based paints, such as benzene, toluene, formaldehyde, etc., will cause great harm to the human body
At the same time, the organic solvents of oil-based paints are mainly extracted from coal and petroleum, which consume a large amount of fossil energy, and the volatilization period lasts for more than ten years, causing certain damage to the atmosphere, which greatly violates the concept of sustainable development

Method used

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  • Application of chitosan guanidine cationic waterborne polyurethane in preparation of antibacterial coating layer
  • Application of chitosan guanidine cationic waterborne polyurethane in preparation of antibacterial coating layer
  • Application of chitosan guanidine cationic waterborne polyurethane in preparation of antibacterial coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Take poly-1,4-butylene adipate diol 600 in a four-necked flask, heat the oil bath to 90°C under the condition of mechanical stirring of 300r / min, vacuumize for 1h to dehydrate, and pass nitrogen Keep the pressure, lower the temperature to below 50°C, add isophorone diisocyanate according to 5.0 times the molar weight of polyadipate-1,4-butylene glycol ester diol, add 3 drops of stannous octoate catalyst, at 80°C In an oil bath, react under nitrogen protection for 3h to obtain a prepolymer terminated by isocyanate groups;

[0050] (2) Pass condensed water, use acetone to reduce the prepolymer viscosity (the amount of acetone is 20% of the prepolymer mass), after being completely dissolved and dispersed, according to the polyadipate-1,4-butylene glycol ester diol mole Diethylene glycol was added to 0.6 times the amount, and polyethylene glycol 200 was added to 0.4 times. Under the protection of nitrogen, the chain extension reaction of small molecules was carried out ...

Embodiment 2

[0055] (1) Take poly-1,4-butylene adipate diol 600 in a four-necked flask, heat the oil bath to 90°C under mechanical stirring at 150r / min, vacuumize for 0.5h to dehydrate, pass Keep the pressure with nitrogen, lower the temperature to below 50°C, add isophorone diisocyanate according to 5.0 times the molar weight of polyadipate-1,4-butylene glycol ester diol, add 3 drops of stannous octoate catalyst, at 85 ℃ oil bath, under the protection of nitrogen for 2 hours to obtain the isocyanate group-terminated prepolymer;

[0056] (2) Pass condensed water, use acetone to reduce the prepolymer viscosity (the amount of acetone is 30% of the prepolymer mass), after completely dissolving, according to polyadipate-1,4-butylene glycol ester diol molar weight Diethylene glycol was added to 0.6 times of the concentration, and polyethylene glycol 200 was added to 0.5 times. Under the protection of nitrogen, the chain extension reaction of small molecules was carried out in an oil bath at 80°...

Embodiment 3

[0061] (1) Take poly-1,4-butylene adipate diol 600 in a four-necked flask, heat the oil bath to 90°C under the condition of 200r / min mechanical stirring, vacuumize for 40min to dehydrate, and blow nitrogen Keep the pressure, lower the temperature to below 50°C, add isophorone diisocyanate according to 5.0 times the molar weight of polyadipate-1,4-butylene glycol ester diol, add 3 drops of stannous octoate catalyst, at 60°C In an oil bath, react for 5 h under nitrogen protection to obtain a prepolymer terminated by isocyanate groups;

[0062] (2) Pass condensed water, use acetone to reduce the prepolymer viscosity (the amount of acetone is 40% of the prepolymer mass), after completely dissolving, according to polyadipate-1,4-butylene glycol ester diol molar weight Diethylene glycol was added to 0.5 times of the concentration, and polyethylene glycol 200 was added to 0.5 times. Under the protection of nitrogen, the chain extension reaction of small molecules was carried out in a...

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Abstract

The invention discloses an application of chitosan guanidine cationic waterborne polyurethane in preparation of an antibacterial coating layer. A preparation method comprises the steps: taking polyester diol as a soft segment, diisocyanate as a hard segment and stannous octoate as a catalyst, and synthesizing an isocyanate end-capped prepolymer; carrying out primary chain extension reaction with small molecular chain extenders diethylene glycol and polyethylene glycol in an acetone dilution environment; introducing a cationic hydrophilic chain extender N-methyldiethanolamine, further carryingout chain extension, generating quaternary ammonium salt under the neutralization action of glacial acetic acid, and emulsifying the neutralized product by a chitosan guanidine aqueous solution underan ice-water bath condition to form the chitosan guanidine / cationic waterborne polyurethane emulsion; and coating a tetrafluoroethylene plate with a film by a film coater to obtain a chitosan guanidine / cationic waterborne polyurethane coating layer. The prepared polyurethane coating layer of chitosan guanidine has high transparency, excellent mechanical property, thermal stability, water resistance and adhesive force, so that the coating layer is expected to be used for antibiosis in the field with high requirements on weather resistance.

Description

technical field [0001] The present invention relates to the field of polymer materials, in particular to a novel polyurethane coating—chitosan guanidine / cationic waterborne polyurethane coating, coating and preparation method thereof, especially in the preparation of chitosan guanidine cationic waterborne polyurethane in the preparation of antibacterial coatings Applications. Background technique [0002] "Green development" is one of the important contents of the five major development concepts, and it is also a continuation of sustainable development. Only by adhering to the basic national policy of environmental protection can green development be achieved. Therefore, environmentally friendly materials have attracted more and more attention. Coatings are indispensable materials in daily production and life, and are used in a wide range of applications. However, the volatile organic solvents (Volatile Organic Compounds, VOC) contained in the oil paint, such as benzene, to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C09D187/00C09D5/14A01N47/44A01P1/00
CPCA01N47/44C08G81/00C09D5/14C09D187/005
Inventor 刘晓非邹雅露刘宇星王园园赵励彦郑淇方
Owner TIANJIN UNIV
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