CN110548663A - method for preparing photocatalytic coating on surface of wooden material - Google Patents
method for preparing photocatalytic coating on surface of wooden material Download PDFInfo
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- CN110548663A CN110548663A CN201910697483.8A CN201910697483A CN110548663A CN 110548663 A CN110548663 A CN 110548663A CN 201910697483 A CN201910697483 A CN 201910697483A CN 110548663 A CN110548663 A CN 110548663A
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- titanium dioxide
- nano titanium
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- paint liquid
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
Abstract
The invention discloses a method for preparing a photocatalytic coating on the surface of a wooden material, which is used for solving the problem that the wooden material in the prior art can not purify polluted gases such as formaldehyde and the like, and comprises the following steps: forming a workpiece, namely cutting the raw material into a required shape according to requirements; ultra-high temperature dehumidification, and three-stage stepwise temperature rise to evaporate water in the wood; finishing the external dimension; leveling powder, namely embedding the workpiece c into a heating container filled with nano titanium dioxide powder, embedding the nano titanium dioxide powder into through holes on the surface of the workpiece, spraying paint on the surface of the workpiece d, and naturally drying; according to the invention, the nano titanium dioxide powder is embedded into the wood, so that the surface hardness of the wood is obviously increased, and meanwhile, the paint liquid added with the nano titanium dioxide powder is matched to adsorb harmful gases such as formaldehyde in the air by utilizing the photocatalytic performance of the titanium dioxide.
Description
Technical Field
The invention belongs to the technical field of building material processing, and particularly relates to a method for preparing a photocatalytic coating on the surface of a wooden material.
background
The wood material is still one of the most commonly used building materials due to excellent texture and texture, and is adopted in both bottom plates and furniture, but compared with stone materials or metal materials, the wood material has lower hardness and poorer wear resistance, more importantly, in order to avoid corrosion, the wood material needs to be additionally provided with a coating on the outer layer to avoid contact with air, the wear resistance of the coating is also poor, a composite floor can also use a binder, the binder can release formaldehyde, the formaldehyde is harmful to human health and needs to be evolved, various purification devices are provided in the prior art, the purification devices have good purification effects, but a large amount of electricity or consumables are consumed, the formaldehyde release period is as long as 3 ~ 10 years, and therefore, the continuous use of the purifier is not economical.
The existing technology provides a building material for purifying harmful gases such as formaldehyde and the like by photocatalysis, the reaction is driven by light to be carried out, and energy is saved, the building material generally uses titanium dioxide as a coating, the principle is that the titanium dioxide is an N-type semiconductor, the band gap width of the titanium dioxide is about 3.2eV, when the light with the wavelength of less than 387.5nm is irradiated, outermost electrons are excited, the excited electrons can jump from a valence band to a conduction band, so as to generate photoinduced electron hole pairs with extremely strong activity, the electron hole pairs provide places for redox reaction, and the harmful gases such as formaldehyde and the like react at the places and are converted, but the titanium dioxide adopted in the prior art is mostly micron-sized, the particle size is large, and the catalytic effect is poor.
Disclosure of Invention
the invention aims to provide a method for preparing a photocatalytic coating on the surface of a wooden material, which not only can keep good photocatalytic effect, but also can improve the surface hardness of the wooden material.
in order to achieve the purpose, the invention adopts the following technical scheme:
A method for preparing a photocatalytic coating on the surface of a wooden material, comprising the following steps:
a. Forming a workpiece; cutting the raw materials into required shapes according to requirements, and polishing the raw materials smoothly;
b. The method comprises the following steps of ultra-high temperature dehumidification, wherein the ultra-high temperature dehumidification process comprises 3 stages, preheating a workpiece for 20 minutes at a preheating temperature of 100 ℃, increasing the temperature to 160 ~ 190 ℃ and increasing the pressure to 0.5 ~ 2mpa for 20 minutes, increasing the temperature to 200 ~ 210 ℃ for 10 minutes, and cooling the workpiece along with a furnace after heating to obtain a workpiece b.
c. And (4) finishing the external dimension, adjusting the external dimension of the workpiece b, polishing the surface smoothly, and cleaning to obtain a workpiece c.
d. And (3) leveling powder, embedding the workpiece c into a heating container filled with nano titanium dioxide powder, heating, knocking the workpiece c embedded in the nano titanium dioxide powder every two minutes, stopping heating after 10 minutes, and removing the nano titanium dioxide on the surface of the workpiece c by using a high-pressure air gun after the workpiece c is cooled to room temperature to obtain a workpiece d.
e. And spraying paint liquid on the surface of the workpiece d, and naturally drying.
Further, the paint liquid includes: 80% of nano titanium dioxide, 5% of wetting dispersant, 3% of flatting agent, 11% of ultrapure water and 1% of industrial pigment.
Further, the thickness of the paint liquid is 0.5mm +/-0.2 mm.
The invention has at least the following beneficial effects:
(1) The reaction can be started by light without electric drive, no extra resource is consumed, the effective time is long, and the replacement is not needed.
(2) Under the condition of illumination, the formaldehyde generated can be effectively removed, and the antibacterial agent has an excellent antibacterial effect and is safer to use.
(3) Through filling up the through-hole on timber surface with nanometer powder, increase timber surface hardness to reduce timber itself's formaldehyde and release.
(4) The nano-scale titanium dioxide powder is adopted, so that the surface area is larger, the catalytic effect is better, meanwhile, the titanium dioxide powder can be fixed on the wood only by an extremely thin coating, and the appearance of the wood cannot be influenced.
Detailed Description
the following examples and experimental examples are further described.
Examples
A method for preparing a photocatalytic coating on the surface of a wooden material comprises the following steps:
a. Forming a workpiece; the raw materials are cut into required shapes according to requirements, polished smoothly, and enough machining allowance is reserved, so that the problems that the size is inconsistent after dehydration and the raw materials cannot be assembled after modification are avoided.
B. The method comprises the following steps of ultra-high temperature dehumidification, wherein the ultra-high temperature dehumidification process comprises 3 stages, preheating a workpiece for 20 minutes at a preheating temperature of 100 ℃, increasing the temperature to 160 ~ 190 ℃ and increasing the pressure to 0.5 ~ 2mpa for 20 minutes, increasing the temperature to 200 ~ 210 ℃ for 10 minutes, and cooling the workpiece along with a furnace after heating to obtain a workpiece b.
It should be noted that: through the cascaded intensification of three stages, can avoid timber to increase because of the temperature is violent, moisture evaporates rapidly and causes timber to warp, the moisture that is close to the workpiece surface in preheating the stage evaporates earlier, the inside vapor of work piece need pass through the evaporation of timber fibre clearance, the heating time of the heating in two preceding stages is longer, timber can fully dewater, effectively reduce the water content, last heating phase is super high temperature drying stage, this stage timber moisture content is very low, timber lasts the duration processing a period at super high temperature, hemicellulose degradation in the timber, hydroxyl in the timber cell wall reduces, the hydroscopicity descends, size stability in the use obtains improving.
c. And (3) finishing the external dimension, adjusting the external dimension of the workpiece b, removing the deformation generated by heating, polishing the surface smoothly, and cleaning the surface by using high-pressure gas to obtain a workpiece c.
d. And (3) leveling powder, embedding the workpiece c into a heating container filled with nano titanium dioxide powder, heating the heating container, transferring the heat of the heating container to the workpiece c due to good heat conductivity of the titanium dioxide powder, uniformly heating the workpiece c, knocking the workpiece c embedded in the nano titanium dioxide powder every two minutes, stopping heating after 10 minutes, and removing the nano titanium dioxide on the surface of the workpiece c by using high-pressure gas after the workpiece c is cooled to room temperature to obtain a workpiece d.
It should be noted that: in the step, the workpiece c is heated again, the temperature of the heated nano titanium dioxide is always controlled to be about 100 ℃, because the workpiece c is wood, the surface of the workpiece c is provided with a large number of through holes, and the nano titanium dioxide powder is smaller than the aperture of the through holes, the nano titanium dioxide powder can be filled into the through holes after the workpiece c is heated and expanded, the workpiece c is knocked from time to time, the nano titanium dioxide powder is promoted to be more tightly filled into the through holes on the surface of the workpiece c, after the workpiece c is cooled, the workpiece c is cooled and contracted, the powder filled into the workpiece c is embedded into the surface of the workpiece c, high-pressure gas is difficult to remove the nano titanium dioxide powder embedded into the surface of the workpiece c, the surface roughness of the workpiece c is increased; in addition, under the illumination condition, the nano titanium dioxide particles embedded on the workpiece c can decompose formaldehyde generated by the wood, so that the content of the formaldehyde is further reduced.
e. And spraying paint liquid on the surface of the workpiece d, and naturally drying.
Through the processing technology, the nano titanium dioxide powder is embedded on the surface of the workpiece, so that the surface hardness of the workpiece is increased, the workpiece is more durable, the workpiece d has photocatalysis capacity and higher surface hardness, but the nano titanium dioxide powder on the surface of the workpiece d is embedded on the through holes on the surface of the wood, the number of the through holes on the surface is limited, the density of the nano titanium dioxide on the surface of the workpiece d is lower than that of the nano titanium dioxide on the surface of a finished product, and therefore, additional spray paint liquid is needed, and better photocatalysis effect is guaranteed.
The paint liquid also contains nano titanium dioxide powder, part of the nano titanium dioxide powder is located on the surface formed by the paint liquid and directly contacts with air, and the nano titanium dioxide powder has small particle size, so that the surface area contacting with the air is larger, and the paint liquid can play a role in purification under the excitation of visible light, and in addition, because the titanium dioxide powder has a better sterilization effect on escherichia coli, streptococcus and the like, the use process is safer and more secure.
The final photocatalytic effect of the paint liquid used in the above examples is affected by the different contents of the components, and is described in detail in the following experimental examples.
Experimental example 1:
The paint liquid a comprises the following components in percentage by weight: 20% of nano titanium dioxide, 2% of wetting dispersant, 3% of flatting agent, 74% of ultrapure water and 1% of industrial pigment, and uniformly stirring;
And spraying the paint liquid a to the surface of the wood material by using a spray gun with the caliber of 1mm, wherein the thickness of the paint liquid a is controlled to be 1mm +/-0.2 mm.
Experimental example 2
The paint liquid b comprises the following components in percentage by weight: 40% of nano titanium dioxide, 3% of wetting dispersant, 3% of flatting agent, 53% of ultrapure water and 1% of industrial pigment, and uniformly stirring.
And spraying the paint liquid b on the surface of the wood material by using a spray gun with the caliber of 1mm, wherein the thickness of the paint liquid b is controlled to be 0.5mm +/-0.2 mm.
Experimental example 3
The paint liquid c comprises the following components in percentage by weight: 60% of nano titanium dioxide, 4% of wetting dispersant, 3% of flatting agent, 32% of ultrapure water and 1% of industrial pigment, and uniformly stirring.
And spraying the paint liquid c to the surface of the wood material by using a spray gun with the caliber of 1mm, wherein the thickness of the paint liquid c is controlled to be 1mm +/-0.2 mm.
experimental example 4
The paint liquid d comprises the following components in percentage by weight: 80% of nano titanium dioxide, 5% of wetting dispersant, 3% of flatting agent, 11% of ultrapure water and 1% of industrial pigment, and uniformly stirring.
And spraying the paint liquid d onto the surface of the wood material by using a spray gun with the caliber of 1mm, wherein the thickness of the paint liquid d is controlled to be 0.5mm +/-0.2 mm.
Experimental samples used in the above experimental examples: the average particle size of the nano titanium dioxide is 30nm, P25 produced by Degussa company is adopted, the specific surface area is 48.6m2/g, and the rutile phase content is 22.3 percent;
The experimental method comprises the following steps:
1. Reagents and instrumentation:
Formaldehyde solution (analytically pure)
synthetic air (cylinder gas), ultraviolet lamp (peak wavelength 365 nm), Siemens temperature and humidity probe, formaldehyde analyzer (Interscan company, USA)
2. The experimental operating method comprises the following steps:
the equipment is installed in a stainless steel sealed cabin, a feed inlet, an air outlet and a quartz glass window are arranged on the sealed cabin, the feed inlet is used for placing a material to be detected, an ultraviolet lamp is arranged outside the quartz glass window, ultraviolet rays are radiated to the material to be detected in the sealed cabin through the ultraviolet lamp, two fans are arranged in the sealed cabin and used for uniformly mixing formaldehyde in the sealed cabin, a temperature and humidity probe and a formaldehyde analyzer are further arranged in the cabin, and the material to be detected is placed close to the quartz glass window; the synthetic air is communicated with the conical flask filled with the formaldehyde solution through a conduit, the formaldehyde separated out from the formaldehyde solution enters the sealed cabin through the synthetic air, and when the concentration reaches the set concentration, the air intake is stopped.
The paint liquid obtained in the four experimental examples is coated on four wood boards, the four wood boards are respectively placed in a sealing box for detection, after ultraviolet irradiation is carried out for one hour, the result is obtained, and the experiment is repeated twice in each example.
3. conditions of the experiment
Humidity: 9285.5mg/m 3;
light intensity: 380 μ w/cm 2;
Initial formaldehyde concentration: 1.3 ppm.
4. Experimental results (Formaldehyde concentration/ppm in sealed cabin)
5. analysis of Experimental results
The content of the nano titanium dioxide is higher, the adsorption effect on formaldehyde is better, because the higher the content of the nano titanium dioxide is, the larger the surface area contacted with air is, the better the catalytic effect is, in addition, the influence of the thickness of the paint liquid on the catalytic effect of the formaldehyde is not obvious, because the nano titanium dioxide is approximately uniformly distributed in the paint liquid, and the density of the nano titanium dioxide on the surface of the paint liquid is not determined by the thickness of the paint liquid.
As a preferred embodiment, the paint liquid comprises the following components in the proportioning range of 60% ~ 80% of nano titanium dioxide, 4% ~ 5% of wetting dispersant, 3% of leveling agent, 11% ~ 32% of ultrapure water and 1% of industrial pigment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A method for preparing a photocatalytic coating on the surface of a wooden material is characterized in that: the method comprises the following steps:
a. Forming a workpiece; cutting the raw materials into required shapes according to requirements, and polishing the raw materials smoothly;
b. the method comprises the following steps of ultra-high temperature dehumidification, wherein the ultra-high temperature dehumidification process comprises 3 stages, preheating a workpiece for 20 minutes at a preheating temperature of 100 ℃, increasing the temperature to 160 ~ 190 ℃ and increasing the pressure to 0.5 ~ 2mpa for 20 minutes, increasing the temperature to 200 ~ 210 ℃ for 10 minutes, and cooling the workpiece along with a furnace after heating to obtain a workpiece b.
c. And (4) finishing the external dimension, adjusting the external dimension of the workpiece b, polishing the surface smoothly, and cleaning to obtain a workpiece c.
d. and (3) leveling powder, embedding the workpiece c into a heating container filled with nano titanium dioxide powder, heating, knocking the workpiece c embedded in the nano titanium dioxide powder every two minutes, stopping heating after 10 minutes, and removing the nano titanium dioxide on the surface of the workpiece c by using a high-pressure air gun after the workpiece c is cooled to room temperature to obtain a workpiece d.
e. And spraying paint liquid on the surface of the workpiece d, and naturally drying.
2. A method for preparing photocatalytic coatings on the surface of wooden materials, as claimed in claim 1, characterized by that: the paint liquid comprises: 80% of nano titanium dioxide, 5% of wetting dispersant, 3% of flatting agent, 11% of ultrapure water and 1% of industrial pigment.
3. A method for preparing photocatalytic coatings on the surface of wooden materials, as claimed in claim 1, characterized by that: the thickness of the paint liquid is 0.5mm plus or minus 0.2 mm.
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| CN201910697483.8A CN110548663A (en) | 2019-07-30 | 2019-07-30 | method for preparing photocatalytic coating on surface of wooden material |
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| CN201910697483.8A CN110548663A (en) | 2019-07-30 | 2019-07-30 | method for preparing photocatalytic coating on surface of wooden material |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060104894A1 (en) * | 2004-11-16 | 2006-05-18 | Daoud Walid A | Method for making single-phase anatase titanium oxide |
| CN104858118A (en) * | 2015-04-07 | 2015-08-26 | 广东左凡智能家居科技有限公司 | Photocatalyst furniture and coating construction process thereof |
| CN105202870A (en) * | 2015-10-26 | 2015-12-30 | 王璐 | Wood drying process |
| CN105984007A (en) * | 2016-01-28 | 2016-10-05 | 阜南县天亿工艺品有限公司 | Antimicrobial wood softener containing nanometer titanium dioxide and preparation method thereof |
| CN106493815A (en) * | 2016-11-09 | 2017-03-15 | 山东农业大学 | The preparation method of compression compact charred wood |
| US20170297056A1 (en) * | 2010-01-29 | 2017-10-19 | Valinge Photocatalytic Ab | Method for applying nanoparticles |
| CN107903790A (en) * | 2017-11-24 | 2018-04-13 | 东莞市明天纳米科技有限公司 | Aqueous woodware paint with purification air and sterilizing function and preparation method thereof |
-
2019
- 2019-07-30 CN CN201910697483.8A patent/CN110548663A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060104894A1 (en) * | 2004-11-16 | 2006-05-18 | Daoud Walid A | Method for making single-phase anatase titanium oxide |
| US20170297056A1 (en) * | 2010-01-29 | 2017-10-19 | Valinge Photocatalytic Ab | Method for applying nanoparticles |
| CN104858118A (en) * | 2015-04-07 | 2015-08-26 | 广东左凡智能家居科技有限公司 | Photocatalyst furniture and coating construction process thereof |
| CN105202870A (en) * | 2015-10-26 | 2015-12-30 | 王璐 | Wood drying process |
| CN105984007A (en) * | 2016-01-28 | 2016-10-05 | 阜南县天亿工艺品有限公司 | Antimicrobial wood softener containing nanometer titanium dioxide and preparation method thereof |
| CN106493815A (en) * | 2016-11-09 | 2017-03-15 | 山东农业大学 | The preparation method of compression compact charred wood |
| CN107903790A (en) * | 2017-11-24 | 2018-04-13 | 东莞市明天纳米科技有限公司 | Aqueous woodware paint with purification air and sterilizing function and preparation method thereof |
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Application publication date: 20191210 |
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