CN111702901B - Preparation method of transparent weather-resistant coating on wood surface - Google Patents
Preparation method of transparent weather-resistant coating on wood surface Download PDFInfo
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- CN111702901B CN111702901B CN202010545090.8A CN202010545090A CN111702901B CN 111702901 B CN111702901 B CN 111702901B CN 202010545090 A CN202010545090 A CN 202010545090A CN 111702901 B CN111702901 B CN 111702901B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/12—Impregnating by coating the surface of the wood with an impregnating paste
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/007—Treating of wood not provided for in groups B27K1/00, B27K3/00 using pressure
- B27K5/0075—Vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2240/00—Purpose of the treatment
- B27K2240/70—Hydrophobation treatment
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Paints Or Removers (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
A method for preparing a transparent weather-resistant coating on the surface of wood. The invention aims to solve the technical problem of constructing a transparent hydrophobic ultraviolet absorption coating on the surface of wood on the premise of not damaging the natural aesthetic texture of the surface of the wood, and provides a preparation method of a weather-resistant coating on the surface of the wood. Firstly, synthesizing graphite-like carbon nitride by using a thermal polymerization method, and treating the graphite-like carbon nitride by using an oxidation stripping method to obtain Carbon Nitride Nano Sheets (CNNs); preparing a composite solution of Cellulose Nanofibers (CNF) and CNNs in a certain mass ratio, and spraying the composite solution on the surface of a wood test piece; and finally, carrying out hydrophobic treatment on the surface of the test piece by using a chemical vapor deposition method to obtain the functional wood with the surface coated with the CNF/CNNs weather-resistant coating. The product is tested for weather resistance for 15 days, the integral color difference is less than 10 percent and far less than 32 percent of the untreated material, and the water contact angle of the surface of the wood is improved from 49 degrees to 135 degrees. The product has the advantages of simplicity, easy obtaining, no toxicity, low cost and the like, has an industrial production prospect, is beneficial to improving the added value of the wood product, simultaneously prolongs the service life of the wood product, and realizes the efficient utilization of the wood resource material.
Description
Technical Field
The invention relates to a preparation method of a weather-resistant coating on a wood surface.
Background
The wood is environment-friendly, renewable and has the characteristics of natural aesthetic texture and the like, and occupies an irreplaceable position in the fields of indoor decoration, buildings and the like. However, as wood is a biomass material, lignin in the main composition of the wood is degraded under the irradiation of ultraviolet rays, and meanwhile, a large number of hydroxyl groups on the surface of the wood make the wood hydrophilic, so that the surface of the wood is damaged under the action of rainwater, wind erosion and the like, the service life of a wood product is seriously shortened, and the use cost is greatly increased.
There are many substances currently available as uv-screening materials, and they are mainly classified into organic uv-absorbers and inorganic uv-absorbers. In recent years, inorganic ultraviolet absorbers have been developed vigorously due to the problems of more by-products, pollution and biological safety of organic reagents during the preparation and use processes of the organic reagents. Wherein, the graphite-like phase carbon nitride (g-C)3N4) The graphene-like two-dimensional material graphite-like Carbon Nitride Nanosheets (CNNs) are inorganic agents which do not contain metal elements, have no biotoxicity, are low in preparation cost, simple in synthesis process and stable in property, and can be subjected to physical/chemical stripping treatment to obtain two-dimensional material graphite-like Carbon Nitride Nanosheets (CNNs) similar to graphene, which mainly need to be used at presentFor use in the field of photocatalysis, using g-C3N4Studies on ultraviolet absorbers have been rarely reported except for the inventors.
Cellulose Nanofiber (CNF) is a fibrous material with a nanoscale structure, and the source of the cellulose nanofiber is mainly wood, bamboo, crop straw and the like, but wood pulp is generally used. The preparation method is various and comprises a mechanical method, an enzymolysis method, a Tempo oxidation method and the like. At present, the method has certain industrial production capacity. The CNF can be widely applied to the fields of coating materials, composite material additives, food additives, film materials, capacitors and the like.
In summary, in order to solve the problems of hydrophilicity and susceptibility to ultraviolet aging of the wood surface, the research prepares a CNF/CNNs composite coating, performs hydrophobic treatment on the surface of the CNF/CNNs composite coating, constructs a transparent hydrophobic protective coating capable of absorbing ultraviolet rays on the wood surface, and obtains the weather-resistant functional wood under the condition of maintaining the natural texture structure of the wood. The experiment has the advantages of simple operation, easy obtaining of products, no toxicity, low cost and the like, and has an industrial production prospect.
Disclosure of Invention
The invention aims to solve the technical problem of constructing a transparent hydrophobic ultraviolet absorption coating on the surface of wood on the premise of not damaging the natural aesthetic texture of the surface of the wood, and provides a preparation method of a weather-resistant coating on the surface of the wood.
The preparation method of the weather-resistant coating is specifically carried out according to the following steps:
1. a preparation method of a transparent weather-resistant coating on the surface of wood comprises the following steps:
(1) placing poplar test pieces with the length, width and thickness of 20mm multiplied by 5mm into an ultrasonic cleaning machine, ultrasonically cleaning the surface for 5 minutes, and placing the cleaned poplar test pieces in a drying box at 60 ℃ for drying for 24 hours for later use;
(2) calcining urea serving as a raw material at 550 ℃ for 2 hours to obtain a g-C3N4 crude product, and uniformly grinding the crude product for later use;
(3) performing oxidation stripping treatment on the g-C3N4 crude product obtained in the step (2) for 24 hours by taking 98% concentrated H2SO4 as an oxidant, performing repeated dialysis treatment on the diluted solution by using a dialysis bag with the cut-off molecular weight of 12000-14000 and deionized water until the pH value of the dialysate is 6.8-7.0, and performing ultrasonic dispersion treatment on the solution in the dialysis bag for 1-2 hours to obtain CNNs;
(4) preparing a CNF/CNNs mixed coating solution with the mass concentration of 1% and the mass ratio of 1: 0.5-1: 0.05 by using the commercial CNF gel and the CNNs prepared in the step (3);
(5) spraying the CNF/CNNs mixed coating solution in the step (4) on the surface of the poplar test piece in the step (1) by using a spray gun, standing at room temperature of 25 ℃ until the poplar surface coating solution is dried and cured;
(6) and (3) carrying out hydrophobic treatment on the wood test piece obtained in the step (5) for 2 hours in a 0.1k Pa vacuum drying oven at 60 ℃ by using methyltrichlorosilane as a hydrophobic agent by using a chemical vapor deposition method to obtain the functional wood with the surface coated with the CNF/CNNs weather-resistant coating.
The method takes the wood as a research object, aims at the problems that the surface of the wood is easy to age by ultraviolet irradiation and corrode by rainwater, constructs a transparent CNF/CNNs ultraviolet absorption coating on the surface of the wood, carries out hydrophobic treatment on the coating, and after 15-day weather-proof experiments on the treated wood, the integral chromatic aberration is less than 10 percent and far less than 32 percent of the untreated wood, and the water contact angle of the surface of the wood is improved from 49 degrees to 135 degrees. The product has the advantages of simplicity, easy obtainment of products, no toxicity, low cost and the like, has an industrial production prospect, is beneficial to improving the added value of wood products, simultaneously prolongs the service life of wood products, and realizes the high-efficiency utilization of wood resource materials.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.
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.
Example 1
And (3) placing the poplar test piece with the length, width and thickness of 20mm multiplied by 5mm into an ultrasonic cleaning machine, ultrasonically cleaning the surface for 5 minutes, and placing the cleaned poplar test piece into a drying box at 60 ℃ for drying for 24 hours for later use. Calcining urea as raw material in open-type tubular furnace at 550 deg.C for 2 hr to obtain g-C3N4And (5) grinding the crude product uniformly for later use. Using 98% concentrated H2SO4For g to C obtained3N4The crude product was subjected to an oxidative stripping treatment for 24 hours under magnetic stirring. And (3) repeatedly dialyzing the diluted solution by using deionized water by using a dialysis bag with the cut-off molecular weight of 12000-14000 until the pH value of the dialysate is 6.8-7.0, and performing ultrasonic dispersion treatment on the solution in the dialysis bag for 1-2 hours to obtain the CNNs. And preparing a CNF/CNNs mixed coating solution with the mass ratio of 1: 0.5-1: 0.05 and the mass concentration of 1% by using the commercial CNF gel and the prepared CNNs. And spraying the CNF/CNNs mixed coating solution on the surface of the poplar test piece by using a spray gun, and standing at room temperature of 25 ℃ until the poplar surface coating solution is dried and cured. And (3) performing hydrophobic treatment on the surface of the coating for 2 hours in a 0.1k Pa vacuum drying oven at 60 ℃ by using methyltrichlorosilane as a hydrophobic agent by using a chemical vapor deposition method to obtain the functional wood with the surface coated with the CNF/CNNs weather-resistant coating.
Example 2
The prepared functional wood with surface weather resistance is placed in a QUV ultraviolet spraying weather-resistant experimental box produced by American Q-LAB company for weather resistance test. The temperature of the test environment is set to be 60 ℃, and the radiation intensity is 1.00W/m2The test time was 15 days. According to a CIELAB color system, a NF333 type spectrophotometer produced by Beijing Kameister company is used for measuring the surface color of the wood after weather resistance test, and the result shows that the integral chromatic aberration of the surface of the wood with the CNF/CNNs coating is less than 10 percent and far less than 32 percent of that of a control group. The OCA20 video optical contact angle measuring instrument produced by Beijing Ordoffian instruments Ltd is used for testing the water contact angle of the surface of the test piece, and the result shows that the contact angle of the surface of the wood test piece after treatment is improved to 135 degrees from 49 degrees before treatment.
Claims (1)
1. A preparation method of a transparent weather-resistant coating on the surface of wood comprises the following steps:
(1) placing poplar test pieces with the length, width and thickness of 20mm multiplied by 5mm into an ultrasonic cleaning machine, ultrasonically cleaning the surface for 5 minutes, and placing the cleaned poplar test pieces in a drying box at 60 ℃ for drying for 24 hours for later use;
(2) calcining urea as raw material at 550 deg.C for 2 hr to obtain g-C3N4Grinding the coarse product uniformly for later use;
(3) with 98% concentrated H2SO4As an oxidizing agent, for g-C obtained in (2)3N4Carrying out oxidation stripping treatment on the crude product for 24 hours, carrying out repeated dialysis treatment on the diluted solution by using a dialysis bag with the cut-off molecular weight of 12000-14000 and deionized water until the pH value of the dialysate is 6.8-7.0, and carrying out ultrasonic dispersion treatment on the solution in the dialysis bag for 1-2 hours to obtain CNNs;
(4) preparing a CNF/CNNs mixed coating solution with the mass concentration of 1% and the mass ratio of 1: 0.5-1: 0.05 by using the commercial CNF gel and the CNNs prepared in the step (3);
(5) spraying the CNF/CNNs mixed coating solution in the step (4) on the surface of the poplar test piece in the step (1) by using a spray gun, standing at room temperature of 25 ℃ until the poplar surface coating solution is dried and cured;
(6) and (3) carrying out hydrophobic treatment on the wood test piece obtained in the step (5) for 2 hours in a 0.1k Pa vacuum drying oven at 60 ℃ by using methyltrichlorosilane as a hydrophobic agent by using a chemical vapor deposition method to obtain the functional wood with the surface coated with the CNF/CNNs weather-resistant coating.
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| CN202010545090.8A CN111702901B (en) | 2020-06-15 | 2020-06-15 | Preparation method of transparent weather-resistant coating on wood surface |
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| CN111702901B true CN111702901B (en) | 2021-11-05 |
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Citations (4)
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|---|---|---|---|---|
| CN107353680A (en) * | 2017-08-23 | 2017-11-17 | 浙江理工大学 | A kind of light catalyzed coating and its preparation method and application |
| CN107803900A (en) * | 2017-10-23 | 2018-03-16 | 东北林业大学 | A kind of preparation method of the feature timber with photocatalytic activity |
| CN109291182A (en) * | 2018-11-06 | 2019-02-01 | 东北林业大学 | A kind of method of physical vaporous deposition preparation ultraviolet aging resistance functional form timber |
| CN110314693A (en) * | 2019-07-23 | 2019-10-11 | 青岛滨海学院 | One type graphite phase carbon nitride nanometer sheet and preparation method and application |
-
2020
- 2020-06-15 CN CN202010545090.8A patent/CN111702901B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107353680A (en) * | 2017-08-23 | 2017-11-17 | 浙江理工大学 | A kind of light catalyzed coating and its preparation method and application |
| CN107803900A (en) * | 2017-10-23 | 2018-03-16 | 东北林业大学 | A kind of preparation method of the feature timber with photocatalytic activity |
| CN109291182A (en) * | 2018-11-06 | 2019-02-01 | 东北林业大学 | A kind of method of physical vaporous deposition preparation ultraviolet aging resistance functional form timber |
| CN110314693A (en) * | 2019-07-23 | 2019-10-11 | 青岛滨海学院 | One type graphite phase carbon nitride nanometer sheet and preparation method and application |
Non-Patent Citations (2)
| Title |
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| 木材表面g-C3N4的固定及其光降解性能表征;袁炳楠;《南京林业大学学报（自然科学版）》;20180131;第42卷(第1期);193-197 * |
| 木质基g-C3N4/TiO2复合涂层的制备及光催化性能表征;董悦;《北京林业大学学报》;20171231;第39卷(第12期);112-117 * |
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