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Waterborne polyurethane coating

A water-based polyurethane and coating technology, applied in the field of polymer materials and nanomaterials, can solve problems such as unsatisfactory dispersion and affect sterilization performance, and achieve the effect of ensuring compatibility and mild preparation conditions.

Active Publication Date: 2021-07-20
JIANGMEN CAIGE ENVIRONMENTAL PROTECTION TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used are isothiazolinones, but such fungicides are not well dispersed in some polyurethane systems, thus affecting their bactericidal performance

Method used

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  • Waterborne polyurethane coating
  • Waterborne polyurethane coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation of embodiment 1 silver nano colloid particle solution

[0015] (1) Weigh 0.5g of macromolecule SMA (Mn=100000), dissolve it in 10ml of organic solvent DMF, stir vigorously, and slowly add ultrapure water dropwise at the same time, when blue opalescence appears, slowly add this solution dropwise In 100ml ultrapure water, and vigorously stirred to obtain SMA nano colloidal particles. (2) Take 10ml of the above-mentioned SMA nano colloidal particle solution, add dropwise 0.2mol / L AgNO3 solution 15μL, wrap it in tin foil to avoid light, and stir for 3 hours under the action of magnetic stirring to fully mix the colloidal particle and silver nitrate, then place Expose under ultraviolet light for 5 minutes to prepare a silver nano colloid particle (nano SMA-Ag) solution.

Embodiment 2

[0016] The characterization of embodiment 2 silver nano colloid particle solution

[0017] After the silver-loaded nano colloid particle (nanoSMA-Ag) solution that step 2 in the embodiment 1 makes is diluted, after dedusting with a 0.45 μm filter membrane, test its particle size distribution with dynamic laser light scattering (DLS), the result Such as figure 1 . And the above-mentioned solution after dedusting by filter membrane was dropped drop by drop on the copper grid, and after drying at room temperature for 1 day, the morphology was observed with TEM, and the results were as follows: figure 2 shown. DLS results show that there are two peaks on the particle size distribution diagram, the nano-silver at 8-12nm, and the peak at about 70nm comes from SMA nanoparticles. The TEM results show that the nano-Ag particle size is about 8-16nm (due to the contrast problem between Ag and SMA colloidal particles, the SMA colloidal particles in TEM are not clear), and it can be se...

Embodiment 3

[0018] The preparation of embodiment 3 waterborne polyurethane coatings

[0019] Add the silver nano-colloid particle solution that embodiment 1 makes in water-based polyurethane resin, and add auxiliary agent, concrete composition is: 100 parts of water-based polyurethane resin, 5 parts of silver nano-colloid particles, 2 parts of water-based defoamer, leveling agent 2 servings.

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Abstract

The invention discloses a water-based polyurethane paint, which is composed of water-based polyurethane resin, silver nano colloid particles and auxiliary agents. Specifically, SMA is used as the polymer matrix, AgNO3 is added, nano-silver is reduced by ultraviolet light, and the nano-silver with antibacterial properties is stably loaded on the SMA colloidal particles through the complexation between the carbonyl group on the anhydride ring of SMA and silver. On the other hand, the obtained silver nano-colloid particles are further added to the water-based polyurethane coating system, which can replace fungicides such as isothiazolinone traditionally used in water-based polyurethane coatings.

Description

technical field [0001] The invention belongs to the field of polymer materials and nanometer materials, and in particular relates to a water-based polyurethane coating. Background technique [0002] At present, due to the excellent mechanical properties of polyurethane coatings, high solid content and other properties, as well as the characteristics of solvent-free and environmental protection of water-based coatings, the application range of water-based polyurethane coatings has been expanded to various fields. The main application directions are wood coatings and automobile repairs. Coatings, anti-corrosion coatings, floor paints, electronic coatings, etc. At present, antifungal and fungicides are a kind of additives often added to waterborne polyurethane coatings, which can endow the coatings with certain antibacterial properties. Isothiazolinones are commonly used, but these fungicides are not well dispersed in some polyurethane systems, thus affecting their fungicidal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D5/14
CPCC08K2003/0806C08K2201/011C09D5/14C09D175/04C08K9/12C08K3/08
Inventor 李莉葛瑞娟
Owner JIANGMEN CAIGE ENVIRONMENTAL PROTECTION TECH IND
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