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Method for preparing polymer ultrathin coating by inhibiting Rayleigh instability

A polymer coating, polymer technology, applied in fiber processing, textiles and papermaking, etc., can solve the problems of cumbersome process, harsh preparation conditions and small scale

Active Publication Date: 2021-07-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention solves the technical problems of harsh preparation conditions, cumbersome process, small scale, limited material subtractive manufacturing and base material selection in the process of preparing a uniform polymer coating in the prior art. The purpose of the invention is to provide a simple and Effectively utilizes the method of suppressing Rayleigh instability to prepare a polymer ultra-thin coating with controllable thickness and uniformity. The invention adopts the solution processing method of coaxial stretching fiber traction coating, and the stretched fiber is first immersed in the oil phase on its surface. Form an oil film with polymer and polymeric surfactant; then immerse in the aqueous phase dispersed with terminated nanoparticles, in a suitable pH range, due to the interfacial electrostatic interaction between the terminated nanoparticles and polymeric surfactant , so that the oil-water interface is blocked, the Rayleigh instability phenomenon of the liquid film on the surface of the substrate can be suppressed to obtain a uniform liquid film, and a uniform polymer ultra-thin coating can be formed on the surface of the fiber by solvent volatilization

Method used

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  • Method for preparing polymer ultrathin coating by inhibiting Rayleigh instability
  • Method for preparing polymer ultrathin coating by inhibiting Rayleigh instability
  • Method for preparing polymer ultrathin coating by inhibiting Rayleigh instability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 100ul of PDMS-NH 2 with 10ml CHCl 3 In the reagent bottle, use a vortex mixer to stir and mix for 5 minutes at a speed of 800 rpm, and the obtained solution is 1v / v% PDMS-NH 2 / CHCl 3 .

[0039] (2) Weigh 1g of CNC-OHSO 3 In a beaker with 100ml of deionized water, use a cell pulverizer to disperse evenly. The frequency of the cell pulverizer is 60%, and the working time is 10min to 20min. The obtained dispersion is 10mg / ml CNC-OHSO 3 / H 2 O.

[0040] (3) The pH of the dispersion obtained in step (2) was prepared by using 0.1 mol / L hydrochloric acid and 0.1 mol / L sodium hydroxide solution to be: 2.02, 3.18, 4.94, 7.38, 11.03 respectively.

[0041] (4) Measure the surface tension of the two phases by using the interfacial viscoelastic measuring instrument with the five different pH solutions prepared in step (1) and step (3).

[0042] surface tension as figure 1 shown. CNC-OHSO at pH 2.02 and 3.18 3 / H 2 O with 1v / v% PDMS-NH 2 / CHCl 3 The interfacia...

Embodiment 2

[0044] (1) The 1v / v% PDMS-NH obtained in the above-mentioned Example 1 2 / CHCl 3 , add PMMA (Mw=350k), using a vortex mixer, under the condition of 800 rpm, stir and mix and dissolve for 30min, the obtained solution is 9wt%PMMA / 1v / v%PDMS-NH 2 / CHCl 3 .

[0045] (2) 9wt%PMMA / 1v / v%PDMS-NH in step (1) 2 / CHCl 3 10mg / mlCNC-OHSO of different pH in solution and above-mentioned example 1 step (3) 3 / H 2 The O dispersion liquid was put into two quartz tanks respectively, the stretched fiber first passed through the oil phase, and then passed through the water phase, and the morphology of the fiber in the water phase was observed by the interface viscoelasticity measuring instrument.

[0046] Such as figure 2 shown. When the pH is 2.02 and 3.18, the surface of the fiber is uniform without Rayleigh instability, but when the pH is 4.94, 7.38 and 11.03, the liquid film on the fiber surface presents a spindle structure, which is the performance of Rayleigh instability. It shows t...

Embodiment 3

[0048] (1) According to the above example 1, configure the CNC-OHSO with mass volume fractions of 2mg / ml, 3mg / ml, 5mg / ml and 10mg / ml respectively 3 / H 2 O, were adjusted to pH 2 with 0.1mol / L hydrochloric acid respectively.

[0049] (2) According to the same steps in the above-mentioned example 2, the drawn fiber is first passed through the oil phase (9wt%PMMA / 1v / v%PDMS-NH 2 / CHCl 3 ), and then through the aqueous phase (CNC-OHSO 3 / H 2 O), observe the morphology of fiber in aqueous phase by interfacial viscoelastic measuring instrument.

[0050] Such as image 3 shown. CNC-OHSO 3 / H 2 When O is 5mg / ml and 10mg / ml, the surface of the fiber is uniform without Rayleigh instability. Indicates higher concentration of CNC-OHSO 3 / H 2 The O two-phase interface assembles quickly, which can quickly suppress the Rayleigh instability of the liquid film.

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Abstract

The invention relates to a method for preparing a polymer ultrathin coating by inhibiting Rayleigh instability, and belongs to the technical field of coating preparation. The preparation method comprises the following steps of (1) dissolving a polymer and a polymer surfactant in an oil phase, and dispersing terminated nanoparticles in a water phase, wherein the terminated nanoparticles and the polymer surfactant can generate electrostatic interaction; (2) immersing a base material into the oil phase to form a liquid film with the polymer and the polymer surfactant on the surface of the base material; and (3) immersing the base material into the water phase to form a uniform polymer coating on the surface of the base material. According to the method, the problems that a non-uniform coating is formed on the surface of the base material due to Rayleigh instability and subtractive manufacturing, limitation of small preparation scale, a complex method and harsh conditions exist in a solution processing process are effectively solved, the utilization efficiency of the material is greatly improved, and large-scale preparation can be achieved; and the method has a relatively wide application prospect in the technical field of coating preparation.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a method for preparing ultra-thin polymer coatings by suppressing Rayleigh instability. Background technique [0002] Polymer coatings are mainly coatings made of organic polymers. With the development of industry and technology, the application fields of polymer coatings continue to expand. Polymer coatings with different structural components have broad application prospects in various fields due to their different properties, and can be applied to flexible electronic devices, organic semiconductor devices, as separation membrane materials, protective coating materials, optical coating materials and Various functional coating materials, etc. [0003] Polymer coatings are usually prepared by solution-based processing technology. The target polymer is dissolved in a selected solvent, and then coated on the substrate by different methods. The polymer coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/643D06M15/507D06M15/356D06M15/263D06M15/233D06M15/05D06M11/79D06M11/74
CPCD06M15/6436D06M15/233D06M15/3562D06M15/05D06M11/79D06M11/74D06M15/263D06M15/507
Inventor 黄才利程泉勇
Owner HUAZHONG UNIV OF SCI & TECH
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