Temperature-sensitive color-changing coating

A temperature-sensitive discoloration and coating technology, applied in the field of building exterior wall materials, can solve the problems of difficult realization of discoloration, inability to use large-scale construction industry, high raw material cost, and achieve the effect of maintaining comfortable temperature, reducing use and saving energy.

Inactive Publication Date: 2012-07-18
武汉康桥伟业高新科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

Among them, among temperature-changing paints, high-temperature discoloration is relatively easy to achieve, while low-temperature discoloration, especially in the temperature r...
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Method used

1, be reversible type color-changing paint, service life is long, long-term use its color-changing performance is still stable; 2, its color-changing mechanism is temperature control, and the color-changing temperature range is within the natural environment temperature range; 3, by adjust...
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Abstract

The embodiment of the invention provides a temperature-sensitive color-changing coating, which comprises following components by weight part ratio: 20 to 160 parts of temperature-sensitive polymers, 2 to 20 parts of film forming agents, 0.2 to 5 parts of thickening agents, 0.5 to 10 parts of dispersing agents, 0.1 to 5 parts of defoaming agents and 100 to 500 parts of solvents. Through the adoption of the temperature-sensitive color-changing coating provided by the invention, the color of an outer wall of a building can change at a certain critical temperature; when the actual temperature is higher than the critical temperature, the coating is white and can reflect 80 percent of heat; when the actual temperature is higher than the critical temperature, the coating is colorless and the color of the outer wall material self is exposed; and if the color of the outer wall self is black, the best sun heat absorbing effect is achieved and 80 percent of the sun heat can be absorbed, so that the effects of indoor comfortable temperature maintenance, reduction of the use of air conditioners and heating equipment, and energy source conservation are achieved.

Application Domain

Polyether coatingsThermosensitive paints +1

Technology Topic

Examples

  • Experimental program(3)

Example Embodiment

[0020] Example 1
[0021] High molecular polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer, its molecular weight M n about 1x10 5 g/mol, 100 parts;
[0022] Film former, 8 parts;
[0023] thickener, 1 part;
[0024] Dispersant, 2 parts;
[0025] Defoamer, 1 part;
[0026] Solvent water, 200 parts.
[0027] The above materials were dissolved and stirred for 90 minutes.
[0028] Polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (PEO-PPO-PEO or EOn-POm-EOn) is a covalent bond that links together hydrophilic PEO segments and hydrophobic PPO segments The polymer compound is used as a polyoxyethylene-containing block copolymer (temperature-sensitive polymer) in this embodiment, which forms an emulsion or solution in a certain solution under temperature control. In other embodiments, polyoxyethylene-polyoxybutylene-polyoxyethylene block copolymers or polyoxyethylene-polyoxypentene-polyoxyethylene block copolymers may also be used. In the example, the discoloration temperature of the paint is about 50°C. When the temperature is above 50°C, the paint is white; when the temperature is below 50°C, the paint is colorless and transparent. At a temperature scan rate of 0.5°C/min to reach 50°C, the discoloration time is about 2 minutes. After repeated discoloration 500 times, its discoloration performance is still stable. Example 2

Example Embodiment

[0028] Polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (PEO-PPO-PEO or EOn-POm-EOn) is a covalent bond that links together hydrophilic PEO segments and hydrophobic PPO segments The polymer compound is used as a polyoxyethylene-containing block copolymer (temperature-sensitive polymer) in this embodiment, which forms an emulsion or solution in a certain solution under temperature control. In other embodiments, polyoxyethylene-polyoxybutylene-polyoxyethylene block copolymers or polyoxyethylene-polyoxypentene-polyoxyethylene block copolymers may also be used. In the example, the discoloration temperature of the paint is about 50°C. When the temperature is above 50°C, the paint is white; when the temperature is below 50°C, the paint is colorless and transparent. At a temperature scan rate of 0.5°C/min to reach 50°C, the discoloration time is about 2 minutes. After repeated discoloration 500 times, its discoloration performance is still stable. Example 2
[0029] High molecular polyethylene glycol-polyglycolide lactide-polyethylene glycol block copolymer, its molecular weight M n about 5x10 4 g/mol, 100 parts;
[0030] Film former, 8 parts;
[0031] thickener, 1 part;
[0032] Dispersant, 2 parts;
[0033] Defoamer, 1 part;
[0034] Solvent water, 200 parts.
[0035] The above materials were dissolved and stirred for 90 minutes.
[0036] In the example, the discoloration temperature of the paint is about 40°C. When the temperature is above 40°C, the paint is white; when the temperature is below 40°C, the paint is colorless and transparent. At a temperature scan rate of 0.5°C/min to reach 40°C, the discoloration time is about 5 minutes. After repeated discoloration 500 times, its discoloration performance is still stable.
[0037] In this embodiment, the macromolecular polyethylene glycol-polyglycolide lactide-polyethylene glycol block copolymer is used as a block copolymer (temperature-sensitive polymer) containing polyethylene glycol, which is Form an emulsion or solution under temperature control in the solution. In other embodiments, polyethylene glycol-polylactic acid-polyethylene glycol block copolymers or polyethylene glycol-polyglycolic acid-polyethylene glycol block copolymers may also be used.

Example Embodiment

[0038] Example 3
[0039] High molecular poly-N,N-diethylacrylamide, its molecular weight M n about 1x10 5 g/mol, 100 parts;
[0040] Film former, 8 parts;
[0041] thickener, 1 part;
[0042] Dispersant, 2 parts;
[0043] Defoamer, 1 part;
[0044] Solvent water, 200 parts.
[0045] The above materials were dissolved and stirred for 90 minutes.
[0046] In the example, the discoloration temperature of the paint is about 38°C. When the temperature is above 38°C, the paint is white; when the temperature is below 38°C, the paint is colorless and transparent. When reaching 38°C with a temperature scan rate of 0.5°C/min, the discoloration time is about 1 minute. After repeated discoloration 500 times, its discoloration performance is still stable.
[0047] In this embodiment, the polymer poly-N,N-diethylacrylamide is used as a polyacrylamide-based polymer (temperature-sensitive polymer), which forms an emulsion or a solution in a certain solution under temperature control. In other embodiments, poly-N,N-dipropylacrylamide or poly-N,N-diethyl-2-carboxyacrylamide can also be used.
[0048] When the temperature is higher than the critical temperature, the temperature-sensitive polymer in the embodiment of the present invention undergoes a phase transition, and stably forms a nano-scale emulsion with the assistance of other components of the coating, and the overall appearance is white.
[0049] The film-forming agent, thickener, dispersant and defoamer in the embodiments of the present invention are commonly used chemical auxiliaries, and the film-forming agent includes but is not limited to protein film-forming agent, acrylic resin film-forming agent, butadiene One or more mixtures of resin film formers, polyurethane film formers and nitrocellulose film formers; the thickeners include but are not limited to sodium carboxymethyl cellulose, agar, xanthan gum, carrageenan , one or more mixtures of pectin; the dispersing agents include but are not limited to triethylhexyl phosphoric acid, sodium lauryl sulfate, methyl amyl alcohol, cellulose derivatives, polyacrylamide, gul One or more mixtures of glue and fatty acid polyethylene glycol ester; the defoamer includes but is not limited to emulsified silicone oil, higher alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene One or more mixtures of oxyethylene polyoxypropanolamine ether, polyoxypropylene glycerol ether and polyoxypropylene.
[0050] The temperature-sensitive color-changing paint in the present invention has the following advantages:
[0051] 1. It is a reversible color-changing paint, with a long service life and stable discoloration performance after long-term use; 2. Its discoloration mechanism is temperature control, and the discoloration temperature range is within the natural temperature range; 3. By adjusting the paint ratio, its discoloration temperature It can be precisely controlled at any temperature of 0-50℃; 4. The temperature range of discoloration is narrow; 5. The discoloration is rapid; 6. The cost of raw materials is low, and it can be widely used in the construction industry.
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Description & Claims & Application Information

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