CN112552752A - Humidity-sensitive color-changing coating and preparation method and application thereof - Google Patents
Humidity-sensitive color-changing coating and preparation method and application thereof Download PDFInfo
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- CN112552752A CN112552752A CN202011401715.XA CN202011401715A CN112552752A CN 112552752 A CN112552752 A CN 112552752A CN 202011401715 A CN202011401715 A CN 202011401715A CN 112552752 A CN112552752 A CN 112552752A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 49
- 238000000576 coating method Methods 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 27
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 27
- 229920000609 methyl cellulose Polymers 0.000 claims abstract description 16
- 239000001923 methylcellulose Substances 0.000 claims abstract description 16
- 235000010981 methylcellulose Nutrition 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000012153 distilled water Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000003623 enhancer Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 20
- 235000011187 glycerol Nutrition 0.000 claims description 15
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical group [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 8
- 230000008961 swelling Effects 0.000 claims description 7
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical group Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000002441 reversible effect Effects 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000003860 storage Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000741 silica gel Substances 0.000 description 7
- 229910002027 silica gel Inorganic materials 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010345 tape casting Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 1
- 239000012928 buffer substance Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 description 1
- 229910001429 cobalt ion Inorganic materials 0.000 description 1
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/08—Cellulose derivatives
- C08J2401/26—Cellulose ethers
- C08J2401/28—Alkyl ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a humidity-sensitive color-changing coating which is prepared from the following raw materials in parts by mass: polyvinyl alcohol: 8-10 parts of methyl cellulose: 1-2 parts of glycerol, 0.2-0.5 part of color enhancer: 3-5 parts of color developing agent: 1-3 parts of distilled water: 100 parts. The humidity-sensitive color-changing coating prepared by the invention can show obvious color change in the environment with low humidity, moderate humidity and high humidity, the reaction phenomenon is reversible, and the color change phenomenon is obvious; when in use, the color-changing film or the color-changing block can be made by optionally shaping; the use state is determined according to different application environments, and the method can adapt to various use requirements.
Description
Technical Field
The invention relates to the field of humidity-sensitive color-changing materials, in particular to a humidity-sensitive color-changing coating and a preparation method and application thereof.
Background
With the improvement of living standard and the development of industrial fields such as industry, people have more subtle or delicate requirements in the production and living process, and the requirement on environmental humidity is naturally improved to the level capable of observing, detecting and even changing at any time. The environmental humidity is an important factor affecting the environmental quality, and affects the production and storage of products, for example, the environmental humidity needs to be strictly controlled in the production process and storage of products such as food, electronic components and the like, and whether a humidity sensitive material exists can reflect the humidity of the environment where the product is located on the premise of not damaging the product or packaging becomes more and more important.
The currently commonly used humidity-sensitive white materials mainly comprise humidity-sensitive allochroic silica gel particles, humidity indicator cards and humidity-sensitive allochroic ink; the humidity-sensitive allochroic silica gel particles adsorb water molecules in air by utilizing a microporous structure in the silica gel, so that metal ions such as cobalt ions in the silica gel undergo a complexing reaction to change color, are commonly found in food and medicine packages, and are placed in the packages of food and medicine in a small package mode. The main color-changing substance cobalt chloride used in the humidity-sensitive color-changing silica gel particles is determined as a secondary carcinogen by European Union in 2004, and is not beneficial to human health, the granular silica gel is easy to be eaten by children by mistake, so that accidents are caused, and meanwhile, the test precision is low, and most of the granular silica gel particles are used for determining whether the humidity in the environment exceeds the standard or not and cannot determine the specific humidity range.
The humidity indicator card stores the metal ions such as copper ions and the like which can change color after absorbing moisture by taking paper as a carrier, different circular areas on the paper correspond to a humidity range, and the corresponding areas on the card can change color according to the humidity in the environment after absorbing moisture, so that the humidity in the environment is indicated. The humidity indicator card is applied to containers and other large environments more, is not suitable for food packaging and other small environments, is too single in use form, has the conditions of moving, sliding and the like in the use process, and may have the problems of loss and the like, and the card is made of paper, can deform after meeting liquid water, and has reduced strength, and influences recovery and repeated use.
The humidity-sensitive color-changing ink is characterized in that an acid-base buffer substance is added into a proper conventional coating or ink to adjust the pH value of the coating or ink so as to change the pH value of the coating or ink into an unstable state which is easy to change, and a color developing substance sensitive to pH change is added at the same time, the substance shows different colors under different pH values, the pH value of the ink or coating changes after the ink or coating absorbs water, the color developing substance also changes color, the color changing interval of the existing humidity-sensitive color-changing ink on the market is 5% -65% of the ambient humidity or 40% -80%, and the ink is used in a printing or smearing mode. The application range of the ink is limited by the use mode, the ink is not suitable for all environments due to the fact that various factors such as adaptability to printing materials and the printing mode need to be considered during printing, and the ink has large limitation, and is more used as an anti-counterfeiting coating instead of a humidity monitoring tool in the actual use process.
Disclosure of Invention
The invention aims to provide a humidity-sensitive allochroic paint aiming at the defects in the prior art, which takes polyvinyl alcohol as a main water absorption base material, has small influence on products by the form of the paint after moisture absorption, can effectively absorb water molecules and accurately reflect the water molecule content under the actual environment humidity.
The invention also aims to provide a preparation method of the humidity-sensitive allochroic paint.
The invention also aims to provide the application of the humidity-sensitive color-changing coating in preparing a humidity-sensitive color-changing film.
The purpose of the invention is realized by the following technical scheme:
the humidity-sensitive color-changing coating comprises the following raw materials in parts by mass: polyvinyl alcohol: 8-10 parts of methyl cellulose: 1-2 parts of glycerol, 0.2-0.5 part of color enhancer: 3-5 parts of color developing agent: 1-3 parts of distilled water: 100 parts.
Preferably, the humidity-sensitive color-changing coating comprises the following raw materials in parts by mass: polyvinyl alcohol: 10 parts of methyl cellulose: 1.3 parts, 0.25 part of glycerin, and a color enhancer: 3.3 parts of color developing agent: 2 parts of distilled water: 100 parts.
Further, the polyvinyl alcohol is 1799 in type.
Further, the color developing agent is copper chloride, and the color enhancer is potassium chloride.
The preparation method of the humidity-sensitive allochroic paint comprises the following steps:
s1, weighing raw materials in proportion;
s2, adding polyvinyl alcohol into distilled water, continuously stirring, and heating in a water bath after swelling to obtain a PVA solution;
s3, adding methyl cellulose and glycerol into the PVA solution, stirring until the methyl cellulose and the glycerol are completely dissolved, and standing;
s4, adding the color enhancer and the color developing agent into the standing solution, and uniformly stirring to obtain the humidity-sensitive color-changing coating.
Further, the swelling time in the step S2 is 30-45 min.
Further, the water bath heating in the step S2 is carried out at the temperature of 80-100 ℃ for 0.5-1 h.
Further, the stirring speed is 600-800 r/min.
An application of the humidity-sensitive color-changing coating in preparing a humidity-sensitive color-changing film.
Further, the application is that the humidity-sensitive color-changing coating is prepared into a humidity-sensitive color-changing film by a tape casting method.
Compared with the prior art, the invention has the following beneficial effects:
the humidity-sensitive allochroic paint prepared by the invention is green when the relative humidity is 10-50%, is blue-green when the relative humidity is 50-80%, and is light blue when the relative humidity is 80-95%; the humidity condition in the environment can be reflected through obvious color change, the measurement precision is high, and the color change reaction is reversible.
The water-absorbing base material contains polyvinyl alcohol, methyl cellulose and glycerin, the prepared material is jelly, is in a fluid state before drying, can be shaped at will, and can be used according to different application environments; the moisture-sensitive color-changing film can be prepared by a tape casting method, can be used as a coating, can be directly coated on a bearing object, and can be removed when not used.
The humidity-sensitive allochroic paint prepared by the invention has viscosity, can be fixed at a painting position after being dried, cannot move, can reflect the humidity condition in a product under the condition of not unsealing, and does not occupy space in a package.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1
The embodiment provides a preparation method of a humidity-sensitive color-changing coating, which comprises the following steps:
s1, weighing the following raw materials in parts by weight: polyvinyl alcohol: 10 parts of methyl cellulose: 1.3 parts, 0.25 part of glycerin, and a color enhancer: 3.3 parts of color developing agent: 2 parts of distilled water: 100 parts of (A);
s2, adding polyvinyl alcohol into distilled water, continuously stirring at the speed of 750r/min, placing the mixture in a water bath kettle at 90 ℃ after swelling for 30min, stopping stirring after 1h, and taking out a beaker from the water bath kettle to obtain a PVA solution;
s3, adding methyl cellulose and glycerol into the PVA solution, stirring for 10min at the rotating speed of 750r/min until the mixture is completely dissolved, and generating a large amount of bubbles in the solution;
s4, standing the solution, adding potassium chloride and copper chloride after bubbles naturally disappear, uniformly stirring to obtain the humidity-sensitive color-changing coating, and pouring the humidity-sensitive color-changing coating into a lightproof storage container for sealed storage.
Example 2
The embodiment provides a preparation method of a humidity-sensitive color-changing coating, which comprises the following steps:
s1, weighing the following raw materials in parts by weight: polyvinyl alcohol: 8 parts of methyl cellulose: 1 part, 0.4 part of glycerin, and a color enhancer: 5 parts of color developing agent: 3 parts of distilled water: 100 parts of (A);
s2, adding polyvinyl alcohol into distilled water, continuously stirring at the speed of 600r/min, placing the mixture into a water bath kettle at the temperature of 100 ℃ after swelling for 45min, stopping stirring after 0.5h, and taking out a beaker from the water bath kettle to obtain a PVA solution;
s3, adding methyl cellulose and glycerol into the PVA solution, stirring for 10min at the rotating speed of 700r/min until the mixture is completely dissolved, and generating a large amount of bubbles in the solution;
s4, standing the solution, adding potassium chloride and copper chloride after bubbles naturally disappear, uniformly stirring to obtain the humidity-sensitive color-changing coating, and pouring the humidity-sensitive color-changing coating into a lightproof storage container for sealed storage.
Example 3
The embodiment provides a preparation method of a humidity-sensitive color-changing coating, which comprises the following steps:
s1, weighing the following raw materials in parts by weight: polyvinyl alcohol: 9 parts of methyl cellulose: 2 parts, 0.2 part of glycerol, and a color enhancer: 5 parts of color developing agent: 1 part of distilled water: 100 parts of (A);
s2, adding polyvinyl alcohol into distilled water, continuously stirring at the speed of 700r/min, placing the mixture into a water bath kettle at the temperature of 80 ℃ after swelling for 40min, stopping stirring after 1h, and taking out a beaker from the water bath kettle to obtain a PVA solution;
s3, adding methyl cellulose and glycerol into the PVA solution, stirring for 10min at the rotating speed of 600r/min until the mixture is completely dissolved, and generating a large amount of bubbles in the solution;
s4, standing the solution, adding potassium chloride and copper chloride after bubbles naturally disappear, uniformly stirring to obtain the humidity-sensitive color-changing coating, and pouring the humidity-sensitive color-changing coating into a lightproof storage container for sealed storage.
Application example 1
The application example provides a humidity-sensitive color-changing film, which is prepared by using the humidity-sensitive color-changing coating in example 1 and forming a film by a tape casting method, and the humidity-sensitive color-changing film is placed in a room with the humidity of 65% and is light green; then transferring the humidity-sensitive color-changing film into a constant humidity box with the humidity of 90 percent, and changing the color of the film into blue; after being taken out from the constant humidity chamber and placed indoors, the film turns into light green.
Application example 2
In the application example, the humidity-sensitive color-changing coating prepared in the embodiment 2 is directly coated inside the vegetable greenhouse, and the greenhouse film is a transparent film, so that the color change condition of the humidity-sensitive color-changing coating can be directly observed outside. When the humidity in the greenhouse is 70%, the humidity-sensitive color-changing coating is blue-green, when the humidity in the greenhouse is reduced to 50%, the humidity-sensitive color-changing coating is green, the humidity in the greenhouse is indicated to be humidified, when the humidity in the greenhouse is increased to 90%, the humidity-sensitive color-changing coating is blue, and at the same time, the haar begins to appear in the greenhouse, the greenhouse is indicated to need ventilation, when the humidity in the greenhouse is reduced to 70%, the humidity-sensitive color-changing coating is changed to blue-green, and the ventilation can be finished.
Application example 3
In the application example, the humidity-sensitive color-changing coating prepared in the embodiment 2 is dried to prepare a blocky humidity-sensitive color-changing block, and the humidity-sensitive color-changing block is respectively placed in glass cabinets with the humidity of 50%, 60% and 90%, so that the humidity-sensitive color-changing block is dark green, and the dark green is changed into blue-green and light blue.
The humidity-sensitive allochroic paint prepared by the invention can determine the use state according to different application environments, and can be prepared into flaky blocks or directly used fluid; the coating can be used as a coating to be directly coated on a bearing object, and can be directly removed when the coating is discarded after being used, so that the use of the product is not influenced. The invention has reversible reaction phenomenon and obvious color change phenomenon, and can adapt to various use requirements.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The humidity-sensitive color-changing coating is characterized by comprising the following raw materials in parts by mass: polyvinyl alcohol: 8-10 parts of methyl cellulose: 1-2 parts of glycerol, 0.2-0.5 part of color enhancer: 3-5 parts of color developing agent: 1-3 parts of distilled water: 100 parts.
2. The humidity-sensitive color-changing coating according to claim 1, wherein the humidity-sensitive color-changing coating is composed of the following raw materials in parts by mass: polyvinyl alcohol: 10 parts of methyl cellulose: 1.3 parts, 0.25 part of glycerin, and a color enhancer: 3.3 parts of color developing agent: 2 parts of distilled water: 100 parts.
3. The moisture sensitive color-changing coating of claim 1, wherein the polyvinyl alcohol is type 1799.
4. The moisture-sensitive color-changing coating according to claim 1, wherein the color-developing agent is copper chloride and the color-enhancing agent is potassium chloride.
5. A method for preparing the humidity-sensitive color-changing coating according to any one of claims 1 to 4, comprising the steps of:
s1, weighing raw materials in proportion;
s2, adding polyvinyl alcohol into distilled water, continuously stirring, and heating in a water bath after swelling to obtain a PVA solution;
s3, adding methyl cellulose and glycerol into the PVA solution, stirring until the methyl cellulose and the glycerol are completely dissolved, and standing;
s4, adding the color enhancer and the color developing agent into the standing solution, and uniformly stirring to obtain the humidity-sensitive color-changing coating.
6. The method for preparing the humidity-sensitive color-changing coating according to claim 5, wherein the swelling time in step S2 is 30-45 min.
7. The method for preparing the humidity-sensitive allochroic paint according to claim 5, wherein the water bath heating in the step S2 is carried out at a temperature of 80-100 ℃ for 0.5-1 h.
8. The method for preparing the humidity-sensitive color-changing coating according to claim 5, wherein the stirring speed is 600 to 800 r/min.
9. Use of the moisture-sensitive color-changing coating according to any one of claims 1 to 4 for preparing a moisture-sensitive color-changing film.
10. The use according to claim 9, wherein the use is for preparing a humidity-sensitive color-changing film from a humidity-sensitive color-changing coating by a casting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401715.XA CN112552752A (en) | 2020-12-04 | 2020-12-04 | Humidity-sensitive color-changing coating and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011401715.XA CN112552752A (en) | 2020-12-04 | 2020-12-04 | Humidity-sensitive color-changing coating and preparation method and application thereof |
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| CN202011401715.XA Pending CN112552752A (en) | 2020-12-04 | 2020-12-04 | Humidity-sensitive color-changing coating and preparation method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113214512A (en) * | 2021-04-16 | 2021-08-06 | 南雄中科院孵化器运营有限公司 | Film capable of stretching, strong in adhesiveness and capable of monitoring humidity change and preparation method thereof |
| CN113322690A (en) * | 2021-06-01 | 2021-08-31 | 福建集成伞业有限公司 | Processing technology of color-changeable umbrella |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048555A (en) * | 1990-08-28 | 1991-01-16 | 北京纺织科学研究所 | Moistrure sensitive allochromic coating |
| CN1365447A (en) * | 1999-07-30 | 2002-08-21 | 莱沃西尔股份公司 | Moisture indicators for the absorbent capacity of a dessicant |
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| CN103690308A (en) * | 2013-12-16 | 2014-04-02 | 福建恒安集团有限公司 | Disposable absorbent article with function of humidity-sensitive discoloration prompt |
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| CN113322690A (en) * | 2021-06-01 | 2021-08-31 | 福建集成伞业有限公司 | Processing technology of color-changeable umbrella |
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Application publication date: 20210326 |