Hydrophobic and light-operated antibacterial waterborne polyurethane composite emulsion and preparation method and application thereof

A technology of water-based polyurethane and composite emulsion, which is applied in polyurea/polyurethane coatings, antifouling/underwater coatings, coatings, etc.

Inactive Publication Date: 2021-05-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, g-C 3 N 4 Composite with ZIF-8 nanocomposite material and WPU emulsion containing fluorine polysiloxane segment, theoretical analysis can inhibit the growth of bacteria on its surface during use and storage, but there is no relevant report so far

Method used

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  • Hydrophobic and light-operated antibacterial waterborne polyurethane composite emulsion and preparation method and application thereof
  • Hydrophobic and light-operated antibacterial waterborne polyurethane composite emulsion and preparation method and application thereof
  • Hydrophobic and light-operated antibacterial waterborne polyurethane composite emulsion and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0029] A kind of preparation method of hydrophobic type and light control antibacterial type aqueous polyurethane composite emulsion of the present invention comprises the following steps,

[0030] Step 1, weigh 10-20g of dicyandiamide in a crucible, place it in a muffle furnace and heat it to 470-550°C at 2.3-4.6°C / min, and keep it for 4-6h to obtain yellow block g-C 3 N 4 , using concentrated HNO 3 Etching and stripping to prepare flake g-C 3 N 4 . In the prepared g-C 3 N 4 Adding Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole (2-MIm) were stirred at room temperature for 6-8 hours, g-C 3 N 4 The concentration of nanosheets is 1-2mg / mL, dicyandiamide, 2-MIm and Zn(NO 3 ) 2 ·6H 2 The mass ratio of O (10-20): (165-248): (60-90). Then the obtained white emulsion was centrifuged, washed 2 to 3 times with absolute ethanol, and the obtained g-C was dispersed in pure water. 3 N 4 @ZIF-8 nanocomposite concentration to 0.5 ~ 2mg / mL.

[0031] Step 2, drying polycaprolactone a...

Embodiment 1

[0040] A kind of preparation method of hydrophobic type and light control antibacterial type aqueous polyurethane composite emulsion of the present invention, concrete preparation method comprises the following steps,

[0041] Step 1, preparation of FSiPU composite emulsion,

[0042] Step 1a, dry PCL1000 and PDSF in an oven at 120°C to remove water for 2 hours to obtain anhydrous PCL1000 and PDSF, and anhydrous PDSF and PCL1000 are in liquid state at this time;

[0043] Step 1b, add 3.88g of anhydrous PCL1000 and 1.056g of anhydrous DMBA into a 250mL round bottom flask, insert a mechanical stirring paddle, a spherical condenser and a glass stopper to keep the whole system in a closed state, and place the flask in a water bath The temperature was raised to 60°C in the middle and kept for 0.5h, the stirring rate was adjusted to 300rpm, the temperature was raised to 80°C after stirring for 30min, 4.446g IPDI was added dropwise at 0.05mL / s, and then 20μL of catalyst DBTDL was adde...

Embodiment 2

[0050] A kind of preparation method of hydrophobic type and light control antibacterial type aqueous polyurethane composite emulsion of the present invention, concrete preparation method comprises the following steps,

[0051] Step 1, preparation of FSiPU composite emulsion,

[0052] Step 1a, dry PCL1000 and PDSF in an oven at 120°C to remove water for 2 hours to obtain anhydrous PCL1000 and PDSF, and anhydrous PDSF and PCL1000 are in liquid state at this time;

[0053] Step 1b, add 3.88g of anhydrous PCL1000 and 1.056g of anhydrous DMBA into a 250mL round bottom flask, insert a mechanical stirring paddle, a spherical condenser and a glass stopper to keep the whole system in a closed state, and place the flask in a water bath The temperature was raised to 60°C in the medium and then kept for 0.5h, the stirring rate was adjusted to 300rpm, the temperature was raised to 80°C after stirring for 30min, 4.446g IPDI was added dropwise at 0.05mL / s, and then 20μL of catalyst DBTDL was...

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Abstract

The invention relates to a hydrophobic and light-operated antibacterial waterborne polyurethane composite emulsion and a preparation method and application thereof. The method comprises the following steps: adding Zn(NO3)2.6H2O and 2-methylimidazole into a g-C3N4 solution, stirring at room temperature to obtain an emulsion, centrifugally separating, washing, and dispersing with water to obtain a dispersion liquid; carrying out heat preservation on polycaprolactone and 2, 2-dimethylolbutanoic acid in a closed state to obtain a reaction solution A, heating to 70-80 DEG C, adding isophorone diisocyanate and dibutyltin dilaurate, carrying out a reaction to obtain a reaction solution B, adding hydroxyl-terminated fluorine-containing polysiloxane, carrying out a reaction for 3-4 hours to obtain a reaction solution C, adding acetone, cooling to 40-60 DEG C, adding 1, 4-butanediol, carrying out heat preservation for 0.5-1 hour to obtain a reaction solution D, finally, adding triethylamine, preserving heat for 0.5-1 hour, and emulsifying with deionized water to obtain an FSiPU composite emulsion; and 2, uniformly mixing the dispersion liquid with the composite emulsion to obtain the hydrophobic and light-operated antibacterial waterborne polyurethane composite emulsion.

Description

technical field [0001] The invention relates to the technical field of coating materials, in particular to a hydrophobic and light-controlled antibacterial water-based polyurethane composite emulsion, a preparation method and application thereof. Background technique [0002] Waterborne polyurethane (abbreviated as WPU) is a polymer with water as the dispersion medium. It has the advantages of safety and environmental protection, good mechanical properties, low temperature resistance, good flexibility, pH stability, acid and alkali resistance, and easy modification. It is widely used In various fields such as leather, fabric, medicine, etc. However, after WPU is used for coating, its hydrophobic performance is not good. In addition, under the appropriate temperature and humidity, the surface of WPU materials is very easy to grow bacteria during use and storage, which not only makes the material break and yellow, but also endangers human health. [0003] Fluoropolymer has l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D7/62C08G18/32C08G18/34C08G18/42C08G18/61C08G18/66C09D5/14
CPCC09D175/06C09D5/14C09D7/62C08G18/6659C08G18/4277C08G18/348C08G18/61C08G18/3206C08K9/10C08K3/28
Inventor 闫凯慕成龙王英博张国超陈华
Owner SHAANXI UNIV OF SCI & TECH
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