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Hydrophilic antifrosting coating

A hydrophilic and coating technology, applied in refrigeration and low temperature fields, can solve the problems of non-reusable use, poor anti-frost effect, poor adhesion between glycerol solution and wall surface, etc., to delay the formation of initial frost crystals and prevent volatilization Effect

Inactive Publication Date: 2007-05-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second method mainly uses the water-absorbing properties of water-absorbing polymers to absorb the water droplets formed in the early stage of frosting to prevent frosting, but it is often not reusable, and the active ingredients of the coating are volatile
There are still many shortcomings in the anti-frost coatings developed for frosting in low-temperature equipment. For example, some people use ethylene glycol to add ethylene glycol to high polymers to inhibit frosting. Although this coating has a certain anti-frost effect, but It is easy to volatilize, and it loses its effect after three experiments. Some people directly apply the thick glycerol solution to the surface of the cold wall, and the water vapor continuously condenses in the thick glycerol solution, achieving the effect of no frosting in a short time , but the glycerol solution has poor adhesion to the wall, and will soon be taken away by the mainstream air or washed away after the frost layer melts
The anti-frost coating with the best effect reported so far can reduce the amount of frosting within 30%, so the existing anti-frost coatings at low temperatures mainly have the following disadvantages: poor anti-frost effect, anti-frost components in organic coatings Volatile, short service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The production steps of anti-frost coating are as follows:

[0020] 1. Production of super absorbent resin:

[0021] The composition of superabsorbent resin is as follows according to mass ratio: Acrylic acid 49, Acrylamide 10, Water 160, Potassium hydroxide 20, Sodium hydroxide 5, Hydroxypropyl methacrylate 7, N, N'-methylenebisacrylamide 0.002, Initiator (ammonium persulfate) 0.04, sodium bisulfite 0.05.

[0022] According to the above formula, add water, potassium hydroxide and sodium hydroxide to the reactor with reflux condenser and dropping funnel 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 carry out a polymerization reaction. After the polymerization reaction, the mixture chang...

Embodiment 2

[0034] The components of the superabsorbent resin are shown in Table 1, and the manufacturing process is the same as in Example 1. Weigh 30 grams of superabsorbent resin, 60 grams of epoxy resin varnish, and 45 grams of glycerol, mix them thoroughly, and use a brush to apply part of the mixture to the left surface of the copper plate with a thickness of 6mm, and measure the coating thickness is 0.8mm. Actual tests show that no obvious frost crystals are found on the cold wall surface after 10 hours of actual operation in the range where the temperature of the cold wall surface is not lower than -10°C and the relative humidity of the air does not exceed 50%. Accompanying drawing 1 is the photograph that refrigeration 6 hours is taken in an experiment that adopts this anti-frost coating. This embodiment illustrates that the invented coating can be used for anti-frost treatment of air-conditioning outdoor units in cold winter in the north.

Embodiment 3，4

[0036] 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,.

[0037] In the test, it is measured that in the case of low air humidity (-10°C), the initial frost crystal appearance time can be delayed for at least 3 hours, and the amount of frost formation can be reduced by at least 3 hours. More than 55%. In the experiment, the longest measurement time is 10 hours, and the "average frosting delay time" and "average frosting amount reduction" in Table 1 are under the condition of air humidity-10℃ average value.

[0038] Example 1

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Abstract

The invention relates to a hydrophilic frost protection coating, which can be applied in household refrigerator, huge refrigerator and other refrigerating equipment, belonging to the low temperature and refrigeration field. Its characteristic is that it contains 20-60 portion mass of one or one combination of copolymer high water absorption resin with acrylate, acrylamide and methacrylate as hydrophilic monomer,30-60 portions of coating one from alcohol acid, epoxy, crylic acid and phenolic resin as base, aterials, and 30-50 portions of glycerine, and the main characteristic is the combination of high water absorption resin and glycerine. The invention can prolong the time of preliminary frost appearing more than 3h decrease the frost quantity 50% and keep the condition without frost in lower humidity of air with good repeatable.

Description

technical field [0001] The invention relates to a hydrophilic anti-frost paint, which can be applied to household refrigerators, large cold storages and other refrigeration equipment, and belongs to the field of low temperature and refrigeration. Background technique [0002] The phenomenon of frosting is common in nature and in low-temperature fields. Frosting has many hazards, especially in refrigeration equipment. The frost layer is a heat insulating layer for the heat exchange surface, which greatly reduces the heat transfer efficiency. In refrigerators and large cold storages, since the frost layer covers the wall, as the frost layer thickens, the surface temperature of the frost will gradually increase, so the equipment cannot reach the set temperature and the items will deteriorate. The defrosting methods currently used are all based on the idea of ​​"defrosting", that is, defrosting will be carried out when the frost layer reaches a certain thickness. There are metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/04C09D163/00C09D161/06C09D167/00C09D5/00
CPCF25D21/04
Inventor 刘中良孟声王洪燕张新华马重芳
Owner BEIJING UNIV OF TECH
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