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Preparation method of a fluorinated halloysite nanotube/waterborne polyurethane composite hydrophobic coating

A technology of halloysite nanotubes and water-based polyurethane, which is applied in the field of preparation, can solve the problems of restricting the extensive research and application of carbon nanotubes, the complicated preparation process of carbon nanotubes, and the high requirements of the processing environment, and achieve unique surface characteristics, good Effects of biocompatibility and easy availability of raw materials

Active Publication Date: 2020-08-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the processing speed is slow, the cost is high and the requirements for the processing environment are high
However, the preparation process of carbon nanotubes with high strength is complicated and expensive, which limits the extensive research and application of carbon nanotubes.

Method used

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  • Preparation method of a fluorinated halloysite nanotube/waterborne polyurethane composite hydrophobic coating
  • Preparation method of a fluorinated halloysite nanotube/waterborne polyurethane composite hydrophobic coating
  • Preparation method of a fluorinated halloysite nanotube/waterborne polyurethane composite hydrophobic coating

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preparation example Construction

[0041] The invention provides a method for preparing a fluorinated halloysite nanotube / water-based polyurethane composite hydrophobic coating, comprising the following steps:

[0042] S1, modification of halloysite nanotubes,

[0043] Weigh a certain mass of halloysite nanotubes and dissolve them in 75% ethanol aqueous solution, ultrasonically vibrate for 30-45min, add a certain mass of ammonia water and 3-aminopropyltrimethoxysilane, stir at room temperature for 24h-36h, then centrifuge and separate with The anhydrous ethanol and water are respectively washed 2-3 times, dried after centrifugal separation, and the modified halloysite nanotubes are obtained.

[0044] S2, preparation of halloysite nanotube / waterborne polyurethane composite emulsion,

[0045] Mix the modified halloysite nanotubes, isocyanate and polyol, and react at 75°C-90°C until the NCO content reaches a stable state. Add a certain quality of 2,2-dimethylolbutyric acid, 1,4-butanediol, dibutyltin dilaurate a...

Embodiment 1

[0057] In a three-necked flask equipped with a condenser tube and a stirrer, add 12.8g of polycarbonate diol (PCDL2000) and 400mg of modified halloysite nanotubes, raise the temperature to 85°C, and wait until PCDL is completely dissolved and mixed with Angstrom After the stellite nanotubes were uniformly mixed, 5 g of isophorone diisocyanate was added into the flask, and the mixture was continuously stirred and reacted until the NCO content reached a stable value. Add 0.7g of 2,2-dimethylolbutyric acid (DMBA) hydrophilic chain extender, 0.54g of 1,4-butanediol small molecule chain extender and two drops of dibutyltin dilaurate catalyst, while adding Acetone, react until the NCO content reaches a stable value, then lower the reaction temperature to 50°C, add 0.47g triethylamine to neutralize for 30min, then add deionized water, stir and emulsify at 1200r / min for 1h, and distill off the acetone under reduced pressure , to obtain aqueous polyurethane composite emulsion. It is s...

Embodiment 2

[0060] The difference from Example 1 is that 400 mg of the modified halloysite nanotubes is changed to 300 mg, and other components and processes are the same.

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Abstract

The invention provides a preparation method of a fluorinated halloysite nanotube / waterborne polyurethane composite hydrophobic coating layer. The preparation method comprises the following steps: introducing silane modified halloysite nanotubes into waterborne polyurethane emulsion, spraying, forming a composite coating layer with a micro-nano crude structure, and carrying out surface modificationon the composite coating layer by using fluorosilane, thus obtaining the fluorinated halloysite nanotube / waterborne polyurethane composite hydrophobic coating layer. The halloysite nanotubes adoptedby the invention are tubular natural nanoparticles, the raw materials are easy to obtain, the cost is low, and the fluorinated halloysite nanotube / waterborne polyurethane composite hydrophobic coatinglayer has the advantages of unique surface properties, high dispersion capacity, good biocompatibility and the like; the micro-nano crude structure is formed by spraying a halloysite nanotube / waterborne polyurethane composite coating material to the surface of a matrix by adopting a spraying method, and the preparation method is easy to operate and is suitable for preparation of a large-area coating layer; the formed coating layer is relatively uniform in thickness; by adopting a surface modification method and utilizing the fluorosilane to modify the coating layer, the using amount of a solvent is saved, and the operation is simple and fast.

Description

technical field [0001] The invention relates to the technical field of water-based paint preparation, in particular to a method for preparing a fluorinated halloysite nanotube / water-based polyurethane composite hydrophobic coating. Background technique [0002] Polyurethane is a kind of multifunctional polymer with carbamate structure in its molecular chain, which is usually prepared by stepwise polymerization of dibasic or polyisocyanate and compounds containing two or more active hydrogens. The binary colloidal system formed by dissolving or dispersing polyurethane resin in water is waterborne polyurethane (WPU). [0003] The structure and ratio of water-based polyurethane hard segment and soft segment can be flexibly adjusted, and it also has the advantages of non-combustibility, low odor, no pollution, energy saving, convenient operation and processing, etc. more and more widely. But at the same time, due to the introduction of hydrophilic groups into the polyurethane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D183/08C09D7/62C08G18/32C08G18/34C08G18/44C08G18/75C08G18/66
CPCC08G18/0823C08G18/3206C08G18/348C08G18/44C08G18/6659C08G18/755C08G77/24C08K2201/011C09D4/00C09D7/62C09D7/67C09D7/70C09D175/04C09D183/08C08K9/02C08K9/06C08K7/26
Inventor 贾非张晶应枭李剑旻王珺牟娜娜李震谭添岳前进
Owner DALIAN UNIV OF TECH
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