Method and apparatus for coating with liquid or supercritical carbon dioxide

A carbon dioxide, supercritical fluid technology, applied in chemical instruments and methods, devices for coating liquids on surfaces, coatings, etc., can solve problems such as hindering applications

Inactive Publication Date: 2001-12-05
NORTH CAROLINA STATE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Continuous coating is often desirable because of the high throughput, however the complex engineering involved often prevents its application

Method used

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  • Method and apparatus for coating with liquid or supercritical carbon dioxide
  • Method and apparatus for coating with liquid or supercritical carbon dioxide
  • Method and apparatus for coating with liquid or supercritical carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Coating equipment and preparation

[0048] The purpose of this series of experiments was to determine whether carbon dioxide could be used as a free surface coating solvent. The equipment used is shown in Figure 1 (see previous description). The device 10 comprises an upper plenum 11 and a lower plenum 12 . Piping is constructed of 1 / 16 inch stainless steel tubing. A magnetic stirrer 13 is provided for cooperating with the stirring rod placed in the lower chamber. The device is supported by a stand 20 and an adjustable clamp 21 . The substrate is held in position by chucks attached to the fixture, which is attached to the interior of the chamber. Also included are a pressure sensor 22 and a temperature sensor 23, also connected to each chamber by 1 / 16 inch stainless steel tubing 24, 24a, 24b, 25 (shown in dashed lines), respectively.

[0049] The chambers can be primed with carbon dioxide from a carbon dioxide pump (not shown) through lines 30 , 30 a , 30 b and val...

Embodiment 2

[0055] 1.4psi / s pressure release rate

[0056]The apparatus in the freezer was charged with clean carbon dioxide and polymer solution at a temperature of 9.1°C and a pressure of 611 psig. The device was removed from the refrigerator and turned upside down to allow the liquid to drain into the substrate chamber. After about 2 minutes, close the valve and place the device upright. Return the chamber to the refrigerator, turn off the pressure transducer, and wait for the system to reach stabilization. Once the top of the liquid is no longer fluctuating, valves 1 and 2 are opened to begin draining. After 1 minute and 6 seconds, close the drain valve and isolate the substrate chamber, turn on the converter in the upper part of the chamber and pump down at a slow rate of 1.4 psi / s. Remove the slides from the apparatus and close all valves. Polymer thin films were observed on glass slides, such as figure 2 with image 3 shown.

Embodiment 3

[0058] 0.89psi / s pressure release rate

[0059] The implementation process of this embodiment is basically the same as the above embodiment 2, and the solution used in the equipment is also the same as that used in embodiment 2. The chambers were allowed to equilibrate at 10.4°C and 606 psig. The solution was observed to be cloudy, so waited for it to become clear and stable before draining. The discharge took 1 minute and 20 seconds. After closing the drain valve, the substrate chamber was isolated and evacuation was initiated at a rate of 0.89 psi / s. Remove slides from chamber. Polymer thin films were observed on glass slides, such as Figure 4 shown. Re-use of the polymer solution failed to produce coated slides, apparently due to dilution of the solution used after these manipulations.

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Abstract

A method of coating a substrate comprises immersing a surface portion of a substrate in a liquid or supercritical first phase. The first phase comprises carbon dioxide and a coating component such as a polymer. The substrate is then withdrawn from the first phase into a distinct second phase such as a gas atmosphere so that the coating component is deposited on said surface portion. The withdrawal step is followed by separating the carbon dioxide from the coating component (e.g., by evaporation, venting, heating, etc.) so that the coating component is retained as a coating layer formed on the surface portion. Apparatus for carrying out the method by free meniscus coating, or employing a metering element such as a knife, blade, or roll, are also disclosed.

Description

field of invention [0001] The present invention relates to a liquid surface coating method and apparatus in which the need to use volatile organic solvents to carry or dissolve paint is avoided by using a carbon dioxide liquid containing the paint ingredients. Background of the invention [0002] There are three types of liquid surface coating methods commonly referred to as "free liquid surface coating": the withdrawal method, the drainage method, and the continuous method. Many other methods also utilize a meniscus to create a paint film on the substrate to be coated. Such methods include roll coating, knife coating and slot die coating. [0003] Lift-up coating (commonly referred to as dip coating) is the most widely used free-surface coating technique in the laboratory and industry because of its simplicity and low cost. Continuous coating is often desirable because of the high throughput, however the complex engineering involved often prevents its application. The dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B05C3/02B05C11/04B05C11/10B05C13/00B05D1/18B05D3/00B05D7/24C09D7/00C09D201/00D06B1/08D06B3/10D06M23/00D06M23/10
CPCB05D2401/90D06M23/10D06M23/105D06B3/10D06B1/08B05D1/18D06M23/00D06B19/00
Inventor R·G·卡波尼尔J·M·德西蒙尼B·J·诺维克
Owner NORTH CAROLINA STATE UNIV
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