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Strong water absorption frost-restraining paint

A strong water-absorbing, coating technology, applied in antifouling/underwater coatings, coatings, defrosting, etc., can solve problems such as unsatisfactory coating thickness, poor impact resistance, and inconspicuous anti-frost effect

Inactive Publication Date: 2009-05-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has certain disadvantages, that is, the anti-frost effect is not obvious in the case of high ambient humidity.
When the ambient humidity is above 55%, the cold surface of the hydrophilic coating generally has initial frost crystals after about 25 minutes of refrigeration experiment, and the coating thickness is not ideal, generally above 0.3mm, and the coating is too thick It will increase the thermal resistance of the heat exchanger and reduce the heat transfer efficiency. In addition, the surface of the coating is relatively soft and has poor impact resistance.
Therefore, the hydrophilic coating still needs to be improved in terms of its film-forming thickness, surface hardness, anti-frost effect under high humidity conditions, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The production steps of anti-frost coating are as follows:

[0025] 1. Production of water-absorbent resin (refer to the general process of existing water-absorbent resin production):

[0026] The composition of water-absorbent resin is as follows according to the mass ratio: Acrylic acid 49, acrylamide 10, water 160, potassium hydroxide 20, sodium hydroxide 5, hydroxypropyl methacrylate 7, N, N'-methylenebisacrylamide 0.002, initiator Agent (ammonium persulfate) 0.04, sodium bisulfite 0.05.

[0027] According to the above formula, add water, potassium hydroxide and sodium hydroxide to the reactor with reflux condenser, dropping funnel and nitrogen conduit, and add acrylic acid and N,N'-methylenebispropene under the condition of nitrogen gas Amide, while stirring, add hydroxypropyl methacrylate, keeping the temperature at 40°C. Add acrylamide, add ammonium persulfate initiator and sodium bisulfite in 4 times. It was heated to 60°C and left to stand for 6 hours to car...

Embodiment 2

[0043] The composition of the water-absorbing resin is shown in Table 1, and the manufacturing process is the same as in Example 1. Weigh 20 grams of water-absorbent resin, 40 grams of polyurethane baking varnish, 30 grams of calcium chloride, and 30 grams of 200# gasoline, stir well after mixing, and spray the mixture on the inner wall of the refrigerator with a spray gun. Figure 7 It is the comparison situation of the amount of frost formed after six months of refrigerator operation for the refrigerator inner wall surface coated with strong water-absorbing anti-frost coating of the present invention and the inner wall bare surface not coated with any coating. The left side is the hydrophilic surface, the right side is the bare surface of the inner wall of the refrigerator, and the environmental condition is T ∞ =—30.6°C, T w =-34.0°C, φ=80%. It can be seen from the figure that a thick layer of frost has formed on the bare surface of the inner wall of the refrigerator on t...

Embodiment 3，4

[0045] Listed respectively in embodiment 3,4, the component of anti-frost coating in table 1, wherein superabsorbent resin and anti-frost coating production process and testing equipment are the same as embodiment 1, and embodiment is listed simultaneously in table 1 1, 2 components and the test effect of 5 embodiments,.

[0046] It is measured in the experiment that when the air humidity-20°C, and the ambient temperature are at 20°C, the surface coated with the strong water-absorbing frost-suppressing coating of the present invention can reduce the initial frost crystal appearance time to at least Delay for more than 3 hours, the anti-frost effect is quite obvious, as in Examples 1, 3, 4 and 5 in the table. In addition, the anti-frost test of the strong water-absorbing anti-frost coating has a maximum measurement time of six months. Taking the inside of the refrigerator in actual operation as the experimental environment, the strong water-absorbing anti-frost coating of the p...

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Abstract

This invention discloses a frost-inhibitive paint with good water absorbency, which comprises: polyacrylic acid absorbent resin 20-40 parts, metal baking paint containing polyacrylic acid resin, amino alkyd resin or polyurethane 40-60 parts, NaCl or KCl crystal particles 20-40 parts, and solvent 20-40 parts. The solvent is cyclohexanone, gasoline, propylene glycol butyl ether, butyl acetate or butanone. The layer painted from the paint has a thickness of 0.06 mm, and an impact strength higher than 50 kg .cm / cm2. The paint has a more obvious frost-inhibitive effect when the humidity is 50%.

Description

technical field [0001] The invention relates to a strong water-absorbing anti-frost coating, which belongs to the technical field of refrigeration and energy saving. Background technique [0002] Frosting is a common natural phenomenon in nature. When the temperature of a certain surface is lower than the dew point temperature of water vapor in the air, frosting may occur. The existence of this phenomenon brings a lot of inconvenience to the actual production and life, and the process of defrosting will consume a lot of energy, so it is necessary to explore various methods of frost suppression. Among them, changing the properties of the surface of the heat exchanger and coating it with a hydrophilic coating is one of the effective anti-frost methods. [0003] The anti-frost mechanism of hydrophilic coatings is still being explored in detail, but it is generally believed that the hydrophilic coatings contain strong water-absorbing substances, which can absorb the water dropl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/02C09D5/16
CPCF25D21/04
Inventor 刘中良勾昱君孟声王洪燕王皆腾
Owner BEIJING UNIV OF TECH
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