Microwave/hot air collaborative drying method of paste-like coating

A drying and microwave technology, used in coatings, drying solid materials, devices for coating liquids on surfaces, etc., can solve the problems of reducing drying efficiency, prone to chemical reaction solvents, slow heating and other problems, to prevent high temperature oxidation or Workpiece damage, significant energy savings, process control effects

Active Publication Date: 2012-08-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slurry coating is widely used in water-based coatings, solvent-based paints, rubber, chemical fiber coloring, plastics, construction, and metal materials due to its advantages of easy dispersion, convenient coating, heating and curing, and room temperature drying. However, due to the complex composition of slurry coatings, high water content, and relatively strict requirements for film-forming performance, it has brought technical difficulties to the rapid drying of coating films, which has seriously restricted the development of the coating industry.
[0003] Slurry coatings generally need to be heated to a certain temperature to meet the requirements of drying moisture content and surface quality of the coating. Conventional heating methods generally include radiation heating, forced convection heating and radiation heating combined with forced convection heating. The traditional heating method is to heat the workpiece or make the tem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The specific steps of the method for the microwave / hot air cooperative drying of the slurry coating of this embodiment include as follows:

[0024] (1) Preheating and drying stage: Apply magnesium oxide refractory slurry coating (moisture content 83wt%) evenly on the workpiece, the thickness of the coating coating is 5mm, keep the thickness of the coating uniform, and then place the workpiece on microwave drying In the equipment, the microwave output power is 5kW / m, and the microwave frequency is 2450MHz, until the average moisture content of the coating is 50wt%;

[0025] (2) Constant-speed drying stage: adjust the power of the microwave drying equipment to 12kW / m, the blowing temperature on the surface of the workpiece to 65°C, and the speed to 1.0m 3 / s hot air until the average moisture content of the coating is 20wt%;

[0026] (3) Deceleration drying stage: adjust the power of the microwave drying equipment to 3kW / m, the blowing temperature on the su...

Embodiment 2

[0028] Implementation Example 2: The specific steps of the method for the microwave / hot air co-drying of the slurry coating in this embodiment include as follows:

[0029] (1) Preheating and drying stage: Apply ultra-fine zinc oxide anti-corrosion slurry coating (water content 90wt%) evenly on the surface of Q235-A workpiece, the thickness of the coating coating is 1mm, keep the coating thickness uniform, and then Place the workpiece in the microwave drying equipment, the microwave output power is 4kW / m, and the microwave frequency is 2450MHz, until the average moisture content of the coating is 55wt%;

[0030] (2) Constant-speed drying stage: adjust the power of the microwave drying equipment to 15kW / m, the blowing temperature on the surface of the workpiece to 60°C, and the speed to 2.0m 3 / s hot air until the average moisture content of the coating is 15wt%;

[0031] (3) Deceleration drying stage: adjust the power of the microwave drying equipment to 4kW / m, the blowing tem...

Embodiment 3

[0033] Implementation Example 3: The specific steps of the method for the microwave / hot air co-drying of the slurry coating in this embodiment include as follows:

[0034] (1) Preheating and drying stage: evenly coat the phosphate-based high-temperature resistant slurry coating (moisture content 75wt%) on the workpiece, the thickness of the coating is 6mm, keep the thickness of the coating uniform, and then place the workpiece In the microwave drying equipment, the microwave output power is 6kW / m, and the microwave frequency is 2450MHz, until the average moisture content of the coating is 60wt%;

[0035] (2) Constant-speed drying stage: adjust the power of the microwave drying equipment to 10kW / m, the blowing temperature on the workpiece surface to 63°C, and the speed to 2.5m 3 / s hot air until the average moisture content of the coating is 18wt%;

[0036](3) Deceleration drying stage: adjust the power of the microwave drying equipment to 5kW / m, the blowing temperature on the...

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Abstract

The invention relates to a microwave/hot air collaborative drying method of a paste-like coating, which belongs to the technical field of microwave heating application. the method comprises the following steps of: respectively adjusting microwave power and hot air volume for a coating with water content of 75-90 wt% in a preheating drying stage, a constant speed drying stage and a decelerating drying stage according to water evaporation rate and water diffusion rate in the coating; and fast and deeply drying the coating at a lower temperature. Compared with other drying methods, the microwave-hot air collaborative low temperature fast and deep drying method of the paste-like coating, which is provided by the invention, has the advantages of energy conservation, environment friendliness and high drying speed; and because the drying temperature is lower, high temperature oxidization of a coating metal substrate can be effectively avoided.

Description

technical field [0001] The invention relates to a microwave / hot air co-drying method for a slurry coating, and belongs to the technical field of microwave heating applications. Background technique [0002] Today's coatings have become the top five synthetic materials along with plastics, adhesives, synthetic rubber, and synthetic fibers. The paint industry is a high-tech industry, and its development level is one of the symbols of the developed level of a country's chemical industry. The volatile organic compounds emitted by the paint into the air when it dries to form a film pose a serious threat to the human ecological environment. For this reason, countries around the world have formulated corresponding environmental protection regulations according to their own characteristics to limit the emission of VOC in coatings. The research of coatings is also developing toward water-based, high-solid differentiation, high-performance and functional. The slurry coating is wide...

Claims

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Application Information

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IPC IPC(8): B05D3/00B05D3/06F26B7/00
Inventor 彭金辉杨金富罗会龙郭胜惠张利波梁贵安周俊文许磊夏仡张世敏
Owner KUNMING UNIV OF SCI & TECH
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