Antibacterial formaldehyde-removing coating and preparation method thereof

A formaldehyde and coating technology, applied in antifouling/underwater coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of not reaching the ideal effect, producing harmful substances, poor durability, etc., to avoid adsorption saturation and secondary Less pollution, good stability, and improved water resistance

Inactive Publication Date: 2019-10-18
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium dioxide is an excellent photocatalyst, but pure titanium dioxide does not achieve the desired effect for photocatalytic removal of formaldehyde
[0005] Organic amines, pipetriazines, and isothiazolinones are added to the existing antibacterial coatings as antibacterial agents, which have obvious antibacterial effects in a short period of time, but have poor durability and temperature resistance, and will produce harmful substances after decomposition under ultraviolet light
[0006] In addition, dibutyltin dilaurate is often used as a catalyst for the synthesis of polyurethane, but the heavy metal tin is harmful to the environment as the polyurethane degrades.

Method used

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  • Antibacterial formaldehyde-removing coating and preparation method thereof

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preparation example Construction

[0093] The present invention also provides a method for preparing the antibacterial and formaldehyde-removing coating according to any of the above technical solutions, comprising the following steps:

[0094] A1 Preparation of prepolymer

[0095] Remove water from polyether polyol, pass nitrogen, add butanone and polyisocyanate, heat, add catalyst to the system dropwise, after reacting for 1-3 hours, add the first chain extender and the second chain extender in sequence, and continue the reaction for 2- 4h, obtain described prepolymer;

[0096] A2 prepares polyurethane aqueous dispersion

[0097] Cool down the prepolymer prepared in step A1, add a neutralizing agent to neutralize, react for 30-40min, add acetone and stir to adjust the viscosity, add water and stir to obtain a polyurethane aqueous dispersion;

[0098] Preparation of A3 functional dispersion

[0099] Add the formaldehyde-removing agent, activated bamboo charcoal powder, and antibacterial agent to acetone, si...

Embodiment 1

[0111] A1 Preparation of prepolymer

[0112] Remove water from the mixture (68g / 32g) of N,N-di(2-hydroxy-3-perfluorohexyl-propyl)methylamine and polytetrahydrofuran ether diol, blow nitrogen, add methyl ethyl ketone and isophorone Heat isocyanate (80g), add a mixture of titanium trichloride and triethylaluminum (0.046g / 0.024g) dropwise to the system, after reacting for 1-3h, add 1,2-dihydroxy-3-propanesulfonic acid in sequence Sodium (4g) and 1,4-butanediol (10g) continued to react for 4h to obtain the prepolymer;

[0113] A2 prepares polyurethane aqueous dispersion

[0114] Cool down the prepolymer prepared in step A1, add neutralizing agent triethylamine (10g) to neutralize, the reaction temperature is 80°C, react for 30-40min, add acetone and stir to adjust the viscosity, add water and stir to obtain Aqueous polyurethane dispersion;

[0115] Preparation of A3 functional dispersion

[0116] Add the pure mixture of nano-layered zirconium phosphate and diatom (4g / 16g), act...

Embodiment 2

[0120] A1 Preparation of prepolymer

[0121] Remove water from the mixture (52g / 22g) of N,N-di(2-hydroxy-3-perfluorohexyl-propyl)methylamine and polytetrahydrofuran ether diol, blow nitrogen, add butanone, toluene diisocyanate (70g ), heating, and dropwise adding a mixture of titanium trichloride and triethylaluminum (0.045g / 0.020g) to the system, after reacting for 2h, adding dimethylolpropionic acid (7g) and 1,4-cyclohexane Dimethanol (10g), continue to react 3h, obtain described prepolymer;

[0122] A2 prepares polyurethane aqueous dispersion

[0123] Cool down the prepolymer prepared in step A1, add neutralizing agent triethanolamine (8g) to neutralize, the reaction temperature is 70°C, react for 30-40min, add acetone and stir to adjust the viscosity, add water and stir to obtain polyurethane water dispersion;

[0124] Preparation of A3 functional dispersion

[0125] Add the pure mixture of nano-layered zirconium phosphate and diatoms (4g / 7g), activated bamboo charcoal...

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Abstract

The invention relates to the technical field of coatings, and provides an antibacterial formaldehyde-removing coating. The coating comprises the following raw materials: polyether polyol, polyisocyanate, an acrylate monomer, a first chain extender, a second chain extender, a neutralizer, a catalyst, an initiator, butanone, acetone, water, an emulsifier, an antibacterial agent, a silane coupling agent, a formaldehyde removal acting substance, activated bamboo charcoal powder and ethylene glycol. According to the invention, titanium trichloride and triethyl aluminum are used as catalysts, and asemi-interpenetrating network polymer is prepared by using complementary properties of polyurethane and polyacrylate, so that water resistance of a coating film is improved, and storage stability is good. A diatom purificant, the activated bamboo charcoal powder and the antibacterial agent are adopted as antibacterial and formaldehyde removal functional materials of the coating, so that the coating has a good antibacterial property and high formaldehyde removal capability.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an antibacterial and formaldehyde-removing coating. Background technique [0002] Formaldehyde, is a kind of irritating gas, has serious damage to the health of human body, for example: causes diseases such as oral cavity, throat, respiratory tract, lung organ, blood. In some home and office environments, due to the use of poor-quality adhesives, binders and other building materials containing formaldehyde, the formaldehyde content in the air exceeds the standard, which is always harmful to people's health. [0003] Water-based polyurethane (also known as water-based polyurethane) is a polyurethane resin containing hydrophilic groups in the molecular chain of polyurethane, which has a strong affinity with water. It can be dispersed in water and formed by using a specific process. stable system. Waterborne polyurethane can be used in architectural coatings and other fields, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D133/08C09D5/14C09D7/61C09D7/62C08G18/66C08G18/48C08G18/32C08G18/22
CPCC09D175/08C09D5/14C09D7/61C09D7/70C09D7/62C08G18/6666C08G18/4854C08G18/3812C08G18/222C08L2205/02C08L2205/03C08L2205/04C08L33/08C08K13/06C08K9/12C08K7/24C08K7/26C08K5/19C08L33/26C08L5/08
Inventor 易苏陈建芳廖欢周亭
Owner HUNAN INSTITUTE OF ENGINEERING
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