Corrosion-resistant hygroscopic coat and preparation method thereof

A coating and corrosion-resistant technology, used in the field of corrosion-resistant and moisture-absorbing coatings and their preparation, can solve the problems of uneven chromaticity, easy pulverization, and poor hygroscopicity, and achieve a simple preparation process, good hygroscopicity, and poor mechanical strength. Effect

Active Publication Date: 2011-08-31
GUANGZHOU HUMAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of organic solvents in the slurry, the production cost is high, there are hidden dangers in production safety during the heating process, and it will damage the health of production personnel and cause pollution to the environment, which cannot meet the requirements of green environmental protection.
[0009] Patent US5120694 relates to a method of coating solid hygroscopic agents such as silica gel and molecular sieves on the surface of aluminum foil substrates. The slurry contains clay binders, polyacrylic acid dispersants and tetrasodium pyrophosphate surfactants. The solvent content is small, but the coating process must first heat the aluminum substrate to a surface temperature of 350-650°C for oxidation, and then heat it at 550-650°C for 1 hour to harden the coating. The whole process consumes time and energy.
[0010] In addition, the thickness of the aluminum foil used to make the runner is generally about 0.1 mm. During the operation of the dehumidifier, the surface of the aluminum foil loaded with the hygroscopic agent is in a state of alternating dry and wet cycles. Compared with other inorganic materials, aluminum foil is prone to corrosion. The adhesion of the dehumidifier will have adverse effects, and it will also affect the life of the dehumidifier runner, and the patent rarely involves the anti-corrosion protection of the aluminum foil and other foil materials used for the dehumidifier runner.
[0011] At present, the hygroscopic coating products used for dehumidifier runners generally have defects such as poor hygroscopicity, poor adhesion of the coating to the substrate, easy chalking, poor appearance, insufficient coating, and uneven chroma.

Method used

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  • Corrosion-resistant hygroscopic coat and preparation method thereof
  • Corrosion-resistant hygroscopic coat and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The water-based anti-corrosion primer coating A component is: the phenolic resin (molecular weight one million) of 25% by weight concentration, the amino crosslinking agent of 3% by weight percent concentration, the isopropanol of 5% by weight percent concentration, the rest is deionized water;

[0053] The composition B of the water-based hygroscopic surface coating is: silica gel (powder) with a concentration of 20% by weight, polyacrylic acid (100,000 molecular weight) with a concentration of 5% by weight, and the rest is deionized water.

[0054] Apply the water-based anti-corrosion primer A on the aluminum foil by roller coating, and bake it at 300°C for 10 seconds to form a thickness of 0.8g / m 2 After cooling, apply water-based moisture-absorbing top coat B by roller coating, and bake at 400°C for 5 seconds to form a thickness of 8g / m 2 The moisture-absorbing top coating of the coating is obtained to obtain a corrosion-resistant moisture-absorbing coating, and th...

Embodiment 2

[0056] The water-based anti-corrosion primer A component is: the acrylic resin (molecular weight ten thousand) that the weight percent concentration is 12%, the silane coupling agent that the weight percent concentration is 1%, the ethylene glycol monobutyl ether that the weight percent concentration is 2% , and the rest is deionized water;

[0057] Water-based moisture-absorbing surface coating B component is: the molecular sieve (powder shape, particle diameter of 1000mm) of 40% by weight concentration, the polyacrylamide (molecular weight 20 million) of 5% by weight concentration, and the rest is deionized water.

[0058] Apply the water-based corrosion-resistant primer A on the aluminum foil by brushing, and bake it at 250°C for 25 seconds to form a thickness of 1.0g / m 2 After cooling, apply water-based moisture-absorbing topcoat B by brush, and bake at 300°C for 10 seconds to form a thickness of 12g / m 2 The moisture-absorbing top coating is used to obtain a corrosion-res...

Embodiment 3

[0060] The water-based anti-corrosion primer coating A component is: the epoxy resin (molecular weight five hundred) that the weight percent concentration is 18%, the isocyanate cross-linking agent that the weight percent concentration is 2%, the ethylene glycol that the weight percent concentration is 1%, the rest is deionized water;

[0061] The water-based hygroscopic surface coating B component is: the molecular sieve (powder) of 10% by weight concentration, the silica gel (sol-like) of 30% by weight concentration, the polyoxyethylene (molecular weight two million) of 7% by weight concentration ), and the rest was deionized water.

[0062] First coat the water-based anti-corrosion primer A on the aluminum foil by dip coating, and bake it at 200°C for 50 seconds to form a thickness of 0.9g / m 2 After cooling, apply water-based moisture-absorbing topcoat B by dip coating, and bake at 80°C for 10 minutes to form a thickness of 10g / m 2 The moisture-absorbing top coating can b...

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Abstract

The invention discloses a corrosion-resistant hygroscopic coat and a preparation method thereof. The coat comprises an upper layer and a lower layer, wherein the lower layer is a corrosion-resistant ground coat, and the upper layer is a hygroscopic surface coat. The preparation method of the coat comprises the steps of: (1) coating water-based corrosion-resistant ground paint A on a base material, and drying the paint A to form a corrosion-resistant ground coat with the thickness being 0.1-5.0g/m<2>; and (2) cooling the corrosion-resistant ground coat, coating water-based corrosion-resistant ground paint B on the corrosion-resistant base coat, and drying to form a hygroscopic surface coat with the thickness being 0.5-100g/m<2> so as to obtain a corrosion-resistant hygroscopic coat on the base material. The invention is simple in preparation process, suitable for continuous production, high in production efficiency, and environment-friendly, so that the good binding force is formed between the formed coats and the base material and among the coats, and obtained material is good in hygroscopicity, corrosion resistance and heat transfer, attractive in appearance, stable in performance, and suitable for the preparation of a rotating wheel of a dehumidifier.

Description

technical field [0001] The invention belongs to the field of hygroscopic materials used in air dehumidification equipment, in particular to a corrosion-resistant hygroscopic coating and a preparation method thereof. Background technique [0002] The relative humidity in the air has an important impact on the environment in which people live, industrial production, and scientific research equipment operate. Especially in areas with high humidity and places such as factories and warehouses with strict humidity requirements, ensuring the required low humidity environment is very important for improving living conditions, developing production technology, ensuring production technology, and improving product quality. significance. [0003] Among various air dehumidification methods, adsorption dehumidification has the characteristics of high dehumidification efficiency, continuous operation, controllable humidity, compact structure, energy saving and material saving, and can al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/32B01D53/28
Inventor 陈兴耀金兴菊黄艳轶魏小飞
Owner GUANGZHOU HUMAN CHEM
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