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Methods for resisting frost on substrates, compositions and copolymers therefor

A composition, copolymer technology, applied in the direction of coating, etc., can solve the problem of not mentioning anti-frost performance and so on

Pending Publication Date: 2022-04-15
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no frost resistance is mentioned

Method used

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  • Methods for resisting frost on substrates, compositions and copolymers therefor
  • Methods for resisting frost on substrates, compositions and copolymers therefor
  • Methods for resisting frost on substrates, compositions and copolymers therefor

Examples

Experimental program
Comparison scheme
Effect test

example

[0151] Material

[0152] Degreaser KM-CL from Kexing Chemical

example 1

[0153] Example 1: Synthesized by conventional free radical polymerization (initiator: 2,2'-azobis(2-methylpropionamidine) dihydrochloride) V50-VPA=20mol%-SPE=80mol% in the present invention Statistical copolymer poly(vinylphosphonic acid-stat-N-(2-methacryloyloxyethyl)-N,N-dimethyl-N-(3-sulfopropyl)ammonium betaine) ( poly(VPA-stat-SPE))

[0154] In a 500 mL tank reactor equipped with a water condenser and mechanical stirring, 10 g of vinylphosphonic acid solution (85.4% purity) and 61.17 g of distilled water were introduced at room temperature (22° C.). The mixture was degassed by bubbling nitrogen heavily for 50 minutes while raising the temperature of the solution to 60°C. After stabilizing the temperature in the tank reactor at 60°C, a 5 wt% aqueous solution of V50 (34.3 g, 6.3 mmol) was introduced under a nitrogen blanket. Then, 40 wt% aqueous SPE solution (220.8 g, 0.79 mol) was fed continuously in two portions: 154.58 g for the first 4 hours (flow rate=0.644 g / min) an...

example 2

[0170] Example 2. Preparation of Aluminum Fins Coated with Poly(VPA-stat-SPE) Prepared by Example 1

[0171] The degreaser was diluted with ultrapure water to achieve a final concentration of 5% wt solution with a pH of about 13. The aluminum fins were then immersed in the 5%wt solution for 2 to 5 minutes and then rinsed with water for another 5 minutes. Dry the aluminum fins at ambient temperature.

[0172] Ultrapure water was heated to 60 °C. The original VPA-SPE solution prepared by Example 1 was diluted to 5000 ppm with heated ultrapure water. Keep the diluted solution warm throughout the coating process.

[0173] A clean and dry aluminum fin was immersed in the diluted VPA-SPE solution at 60 °C for 5 minutes.

[0174] The coated aluminum fins were placed in an oven at 75°C for 10 minutes, at 120°C for 30 minutes and at 80°C overnight.

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Abstract

The present disclosure relates to the use of a composition comprising a copolymer having recurring units derived from one or more zwitterionic monomers and recurring units derived from one or more phosphorous acid monomers for making a substrate resist frost.

Description

technical field [0001] The present invention relates to the field of frost resistance on substrates, compositions and copolymers therefor. Background technique [0002] Frosting occurs when the surface temperature is below the freezing temperature of water and the dew point temperature of air. In other words, when contact occurs between a cold surface and adjacent water vapor in the air, due to the temperature difference, frost begins to form. Frosting is a common natural phenomenon on cold surfaces. In our daily life, frost on cold surfaces will reduce the operating efficiency of refrigeration equipment and cause huge energy waste, such as: frost on heat exchangers of air conditioners, frost on refrigerators and other refrigeration devices. Since the frost layer has a certain thermal insulation effect, the frost on the surface of the refrigeration equipment will damage the heat transfer efficiency of the equipment and narrow or even block the airflow channel, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/56
CPCC08F220/385C09D133/14C08F230/02
Inventor 包从余吉鹏飞顾云娇
Owner RHODIA OPERATIONS SAS