CN107522888B - Ultraviolet-shielding and water mist-preventing coating on film surface and preparation method thereof - Google Patents
Ultraviolet-shielding and water mist-preventing coating on film surface and preparation method thereof Download PDFInfo
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- CN107522888B CN107522888B CN201710831375.6A CN201710831375A CN107522888B CN 107522888 B CN107522888 B CN 107522888B CN 201710831375 A CN201710831375 A CN 201710831375A CN 107522888 B CN107522888 B CN 107522888B
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- film
- tannic acid
- water mist
- methyl cellulose
- hydroxypropyl methyl
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- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
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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
- C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
- C09D101/08—Cellulose derivatives
- C09D101/26—Cellulose ethers
- C09D101/28—Alkyl ethers
- C09D101/284—Alkyl ethers with hydroxylated hydrocarbon radicals
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- 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
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/26—Cellulose ethers
- C08J2301/28—Alkyl ethers
Abstract
The invention discloses a film surface ultraviolet-shielding and water mist-preventing coating and a preparation method thereof. At least one combined coating layer formed by a hydroxypropyl methyl cellulose layer and a tannic acid layer is covered on the two surfaces of the membrane, and the hydroxypropyl methyl cellulose layer and the tannic acid layer in the combined coating layer are respectively used as an inner layer and an outer layer. The preparation method comprises the following steps: hydroxypropyl methylcellulose and tannic acid solution were prepared. Fully soaking the membrane in enough hydroxypropyl methyl cellulose solution, cleaning in deionized water, and drying; then soaking in sufficient tannic acid solution, washing in deionized water, and drying. Repeating the steps for a plurality of times to obtain the film with the ultraviolet shielding and water mist preventing coating on the surface. The preparation method is simple and easy to implement, the selected raw materials are green and environment-friendly, the treated film has good ultraviolet shielding and water mist preventing performances, the transparency of the film is kept, and the film has wide application prospects in the fields of packaging materials and the like.
Description
Technical Field
The invention relates to a coating and a preparation method thereof, in particular to an ultraviolet-shielding and water mist-preventing coating on the surface of a film and a preparation method thereof.
Background
It is well known that the properties of materials, particularly human health, are affected by prolonged exposure to ultraviolet light. To date, many materials have been used to reduce the level of uv damage, and metal oxide nanoparticles such as zinc oxide and titanium dioxide have been used in a wide variety of applications. However, the metal oxide nanoparticles have the function of photocatalytic degradation, so that negative effects of promoting photodegradation are generated on the matrix material. In addition, the water fog phenomenon is relatively common in daily life. When water mist is generated, people can hardly see the real shape and size of an object, so that inconvenience and even danger are brought. At present, a plurality of materials and technical methods for preventing water mist exist, but the combination of ultraviolet shielding and water mist prevention is rare. Moreover, with the increasing awareness of environmental protection, it is valuable to apply green environmental protection materials to ultraviolet shielding or water mist prevention by a simple and effective method.
Disclosure of Invention
In order to overcome the problems in the background art, the invention aims to provide an ultraviolet-shielding and water-fog-preventing coating on the surface of a film and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a UV-shielding and water-mist-preventing coating on the surface of a film:
at least one combined coating layer formed by a hydroxypropyl methyl cellulose layer and a tannic acid layer is covered on the two surfaces of the membrane, and the hydroxypropyl methyl cellulose layer and the tannic acid layer in the combined coating layer are respectively used as an inner layer and an outer layer.
The film is a polylactic acid film, a polyethylene terephthalate film, a polypropylene film or a polyethylene film.
Secondly, a preparation method of the ultraviolet shielding and water mist preventing coating on the surface of the film comprises the following steps:
1) preparing hydroxypropyl methyl cellulose and a tannic acid solution;
2) fully soaking the membrane in sufficient hydroxypropyl methyl cellulose solution for 1-5 min, washing in deionized water for 2 times, and drying; then soaking in sufficient tannic acid solution for 1-5 min, washing in deionized water for 2 times, and drying;
3) repeating the step 2) for a plurality of times to obtain the film with the ultraviolet shielding and water mist preventing coating on the surface.
The hydroxypropyl methyl cellulose solution is prepared by adopting the following method: dissolving the dried hydroxypropyl methyl cellulose powder in deionized water at normal temperature with stirring to obtain a uniform and transparent hydroxypropyl methyl cellulose solution with the concentration of 0.5-2.0 wt%.
The tannic acid solution is prepared by adopting the following method: dissolving the dried tannic acid powder in deionized water at normal temperature with stirring to obtain a uniform and transparent tannic acid solution with a concentration of 0.5-2.0 wt%.
Compared with the background art, the invention has the beneficial effects that:
the invention selects green environment-friendly raw materials of hydroxypropyl methylcellulose and tannic acid, constructs a multilayer coating on the surfaces of a polylactic acid film, a polyethylene glycol terephthalate film, a polypropylene film or a polyethylene film and the like based on a layer-by-layer assembly method driven by hydrogen bond acting force, so that the matrix film has the functions of shielding ultraviolet rays and preventing water mist and keeps the transparency of the matrix film. The preparation method is simple and easy to implement, does not need complex chemical treatment and expensive instruments and equipment, and has good controllability; the processed film has wide application prospect in the fields of packaging materials and the like.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The examples and comparative examples of the present invention are as follows:
in examples and comparative examples, polylactic acid film, hydroxypropylmethylcellulose (type I, viscosity: 400mPa.s) and tannic acid (analytically pure) were all commercially available materials.
Example 1:
(1) 2g of the dried hydroxypropylmethylcellulose powder was dissolved in 398g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent hydroxypropylmethylcellulose solution having a concentration of 0.5%.
(2) 2g of dried tannic acid powder was dissolved in 398g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent tannic acid solution with a concentration of 0.5%.
(3) Soaking a polylactic acid film (length multiplied by width: 10cm multiplied by 10cm) in the hydroxypropyl methyl cellulose solution formed in the step (1) for 1min, washing with 500mL of deionized water for 2 times, and drying at 40 ℃; soaking in the tannic acid solution formed in the step (2) for 1min, washing with 500mL of deionized water for 2 times, and drying at 40 ℃.
(4) And (4) repeating the step (3) for 30 times to obtain the polylactic acid film with the ultraviolet shielding and water mist preventing coating on the surface.
The results of the ultraviolet shielding and water mist resistance tests are shown in table 1.
Example 2:
(1) 4g of the dried hydroxypropylmethylcellulose powder was dissolved in 396g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent hydroxypropylmethylcellulose solution having a concentration of 1.0%.
(2) 4g of the dried tannic acid powder was dissolved in 396g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent tannic acid solution with a concentration of 1.0%.
(3) Soaking a polylactic acid film (length multiplied by width: 10cm multiplied by 10cm) in the hydroxypropyl methyl cellulose solution formed in the step (1) for 2min, washing with 500mL of deionized water for 2 times, and drying at 40 ℃; soaking in the tannic acid solution formed in the step (2) for 2min, washing with 500mL of deionized water for 2 times, and drying at 40 ℃.
(4) And (4) repeating the step (3) for 20 times to obtain the polylactic acid film with the ultraviolet shielding and water mist preventing coating on the surface.
The results of the ultraviolet shielding and water mist resistance tests are shown in table 1.
Example 3:
(1) 8g of the dried hydroxypropylmethylcellulose powder was dissolved in 392g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent hydroxypropylmethylcellulose solution having a concentration of 2.0%.
(2) 8g of the dried tannic acid powder was dissolved in 392g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent tannic acid solution with a concentration of 2.0%.
(3) Soaking a polylactic acid film (length multiplied by width: 10cm multiplied by 10cm) in the hydroxypropyl methyl cellulose solution formed in the step (1) for 5min, washing with 500mL of deionized water for 2 times, and drying at 40 ℃; soaking in the tannic acid solution formed in the step (2) for 5min, washing with 500mL of deionized water for 2 times, and drying at 40 ℃.
(4) And (5) repeating the step (3) for 5 times to obtain the polylactic acid film with the ultraviolet shielding and water mist preventing coating on the surface.
The results of the ultraviolet shielding and water mist resistance tests are shown in table 1.
Comparative example 1:
(1) 8g of the dried hydroxypropylmethylcellulose powder was dissolved in 392g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent hydroxypropylmethylcellulose solution having a concentration of 2.0%.
(2) A polylactic acid film (length. times. width: 10 cm. times.10 cm) was immersed in the hydroxypropylmethylcellulose solution formed in step (1) for 5min, washed 2 times with 500mL of deionized water, and dried at 40 ℃.
(4) And (3) repeating the step (2) for 5 times to obtain the polylactic acid film with the surface coated with the hydroxypropyl methyl cellulose coating.
The results of the ultraviolet shielding and water mist resistance tests are shown in table 1.
Comparative example 2:
(1) 8g of the dried tannic acid powder was dissolved in 392g of deionized water under magnetic stirring at room temperature to obtain a uniform and transparent tannic acid solution with a concentration of 2.0%.
(2) A polylactic acid film (length. times. width: 10 cm. times.10 cm) was immersed in the tannic acid solution formed in step (1) for 5min, washed 2 times with 500mL of deionized water, and dried at 40 ℃.
(4) And (3) repeating the step (2) for 5 times to obtain the polylactic acid film with the surface coated with the tannin coating.
The results of the ultraviolet shielding and water mist resistance tests are shown in table 1.
The ultraviolet shielding and water fog preventing performance tests of the various embodiments of the invention are carried out, and the test results are shown in table 1, wherein the blank sample is a polylactic acid film without a coating. The ultraviolet shielding performance test method comprises the following steps: measured using an ultraviolet spectrophotometer (model: Lambda 900, Perkin Elmer, USA), the wavelength range: 200-800nm, the UV absorption in Table 1 is at 280nm for example. The waterproof fog performance test method comprises the following steps: testing by using a light transmittance haze tester (model: WGT-S, Shanghai Shenguang Co.); the samples were first pretreated in a refrigerator at about-20 ℃ for 1h and then quickly placed on top of boiling water (distance: about 5cm) for testing.
TABLE 1
| Sample (I) | Ultraviolet absorption (%) | Haze (%) |
| Blank sample | 0 | 26.5±0.3 |
| Example 1 | 82.5±0.4 | 3.2±0.2 |
| Example 2 | 94.6±0.6 | 0.3±0.1 |
| Example 3 | 80.1±0.2 | 4.0±0.3 |
| Comparative example 1 | 0 | 24.0±0.3 |
| Comparative example 2 | 10.3±0.1 | 23.6±0.5 |
As can be seen from the analysis of the data in table 1, examples 1, 2 and 3, the coatings prepared on the surface of the polylactic acid film comprise a hydroxypropyl methylcellulose layer and a tannic acid layer, and such coatings provide the polylactic acid film with good uv shielding and water mist preventing properties. Compared with example 3, in comparative example 1, the coating prepared on the surface of the polylactic acid film only comprises the hydroxypropyl methyl cellulose layer, and the coating does not provide the polylactic acid film with ultraviolet shielding performance, and the coating improves the water fog resistance of the polylactic acid film but is not obvious. In comparison with example 3, in comparative example 2, only the tannic acid layer was included in the coating layer prepared on the surface of the polylactic acid film, and such a coating layer improved both the ultraviolet shielding property and the water mist preventing property of the polylactic acid film, but none of them was significant.
The above examples are only for explaining the present invention, and do not limit the scope of protection of the present invention. Any equivalent changes or modifications made within the spirit of the present invention and the scope of the claims are to be considered as within the scope of the present invention.
Claims (4)
1. A preparation method of a film surface ultraviolet-shielding and water mist-preventing coating is characterized by comprising the following steps:
1) preparing hydroxypropyl methyl cellulose and a tannic acid solution;
2) fully soaking the membrane in sufficient hydroxypropyl methyl cellulose solution for 1-5 min, washing in deionized water for 2 times, and drying; then soaking in sufficient tannic acid solution for 1-5 min, washing in deionized water for 2 times, and drying;
3) repeating the step 2) for a plurality of times to obtain the film with the ultraviolet shielding and water mist preventing coating on the surface.
2. The method of claim 1 for preparing a uv and water mist barrier coating on a film surface, wherein the coating comprises: the hydroxypropyl methyl cellulose solution is prepared by adopting the following method: dissolving the dried hydroxypropyl methyl cellulose powder in deionized water at normal temperature with stirring to obtain a uniform and transparent hydroxypropyl methyl cellulose solution with the concentration of 0.5-2.0 wt%.
3. The method of claim 1 for preparing a uv and water mist barrier coating on a film surface, wherein the coating comprises: the tannic acid solution is prepared by adopting the following method: dissolving the dried tannic acid powder in deionized water at normal temperature with stirring to obtain a uniform and transparent tannic acid solution with a concentration of 0.5-2.0 wt%.
4. The method of claim 1 for preparing a uv and water mist barrier coating on a film surface, wherein the coating comprises: the film is a polylactic acid film, a polyethylene terephthalate film, a polypropylene film or a polyethylene film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710831375.6A CN107522888B (en) | 2017-09-11 | 2017-09-11 | Ultraviolet-shielding and water mist-preventing coating on film surface and preparation method thereof |
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| CN201710831375.6A CN107522888B (en) | 2017-09-11 | 2017-09-11 | Ultraviolet-shielding and water mist-preventing coating on film surface and preparation method thereof |
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| CN107522888B true CN107522888B (en) | 2020-05-22 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108451921A (en) * | 2018-04-04 | 2018-08-28 | 上海祺宇生物科技有限公司 | A kind of anti-ultraviolet plant hollow capsule shell |
| CN110016260B (en) * | 2019-04-25 | 2021-02-12 | 浙江理工大学 | Natural nontoxic highly transparent water-proof fog coating and preparation method thereof |
| CN111621050A (en) * | 2020-06-29 | 2020-09-04 | 浙江理工大学 | Oxygen-blocking and oxidation-resisting coating of food-grade konjac glucomannan and tannic acid and preparation method thereof |
| CN113058830B (en) * | 2021-03-16 | 2022-05-13 | 安徽华能电缆集团有限公司 | Preparation method of underwater adhesive coating capable of being adhered for long time based on alloy substrate |
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| CN103119107A (en) * | 2010-07-30 | 2013-05-22 | 埃西勒国际通用光学公司 | Optical article including an antireflecting coating having antifog properties and process for making same |
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| CN103119107A (en) * | 2010-07-30 | 2013-05-22 | 埃西勒国际通用光学公司 | Optical article including an antireflecting coating having antifog properties and process for making same |
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| pH Responsive Decomposable Layer-by-Layer Nanofilms and Capsules on the Basis of Tannic Acid;Tatsiana Shutava et al.;《Macromolecules》;20050302;第2850-2858页 * |
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