CN114055590A - Ultraviolet-resistant fiberboard for outdoor decoration - Google Patents
Ultraviolet-resistant fiberboard for outdoor decoration Download PDFInfo
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- CN114055590A CN114055590A CN202111291585.3A CN202111291585A CN114055590A CN 114055590 A CN114055590 A CN 114055590A CN 202111291585 A CN202111291585 A CN 202111291585A CN 114055590 A CN114055590 A CN 114055590A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
Abstract
The invention discloses an ultraviolet-resistant fiberboard for outdoor decoration, which relates to the technical field of fiberboard processing, and the preparation method comprises the following steps: 1) mixing graphene oxide and butyl titanate, performing constant-temperature water bath treatment, and performing heat treatment to obtain an anti-ultraviolet compound; 2) dispersing the anti-ultraviolet composite in deionized water to form a suspension, adding the ferroferric oxide nanowires into the suspension, adding a reducing agent, and carrying out heating reaction to obtain an anti-ultraviolet aerogel composite; 3) and uniformly mixing the plant fiber, the bamboo powder, the wheat bran, the paraffin, the ultraviolet-resistant aerogel compound and the urea-formaldehyde resin adhesive, paving, prepressing and carrying out hot-pressing treatment to obtain the ultraviolet-resistant fiberboard. The anti-ultraviolet fiber board has excellent anti-ultraviolet capability, and the anti-ultraviolet capability of the fiber board is not obviously weakened along with the prolonging of time, and the anti-ultraviolet capability is still excellent.
Description
Technical Field
The invention belongs to the technical field of fiberboard processing, and particularly relates to an ultraviolet-resistant fiberboard for outdoor decoration.
Background
The fiberboard is also named as a density board, which is an artificial board made of wood fiber or other plant cellulose fiber as a raw material and applied with urea-formaldehyde resin or other applicable adhesives, and the fiberboard can be applied with adhesives, additives and the like in the manufacturing process; the fiberboard has the advantages of uniform material, small longitudinal and transverse strength difference, difficult cracking and the like, and has very wide application; 2.5-3 cubic meters of wood is needed for manufacturing 1 cubic meter of fiberboard, and 3 cubic meters of sawn timber or 5 cubic meters of log can be replaced, so that the development of fiberboard production is an effective way for comprehensive utilization of wood resources.
In the existing technology of composite wood fiber material artificial plate, glass fiber, mineral cotton fiber and the like are used as tough fiber, mixed with glue and filling fiber in the production process, sprayed on a press station for die-casting forming, the material characteristics of the glass fiber and the mineral cotton fiber can generate thermal stress (temporary stress and residual stress) when being subjected to high temperature during processing, so that the plate is deformed and embrittled due to temperature change after being formed or used, and the plate is easy to degrade and discolor under ultraviolet rays, has extremely high aging speed, influences the use effect of the fiber plate, reduces the service life of the fiber plate, and has important significance for prolonging the service life of wood, improving the use value of the wood, saving wood resources and increasing the added value of the wood by carrying out ultraviolet-resistant treatment on the wood. For example, chinese patent CN2016105348956 discloses a method for preparing antibacterial and ultraviolet-resistant wood and the resulting product, comprising sequentially impregnating wood with wood impregnating solution a and wood impregnating solution B, wherein wood impregnating solution a is aqueous solution of zinc salt, and wood impregnating solution B is aqueous solution of alkali, and the wood treating process provided by the present invention comprises in-situ generating nano zinc oxide inside wood by wet chemical method, and has strong binding force between nano particles and wood components, low loss, and long-lasting modification effect; however, the depth of impregnation liquid penetrating into the wood is shallow due to single impregnation treatment, so that the nano zinc oxide exists in the shallow structure of the wood, the retention rate of the nano zinc oxide in the wood is lower and lower in the using process, the ultraviolet resistance of the wood is gradually reduced, and the long-acting effect cannot be realized.
Disclosure of Invention
The invention aims to solve the existing problems and provides an ultraviolet-resistant fiber board for outdoor decoration.
The invention is realized by the following technical scheme:
an ultraviolet-resistant fiber board for outdoor decoration is prepared by the following steps:
1) mixing graphene oxide and butyl titanate, performing constant-temperature water bath treatment, and performing heat treatment to obtain an anti-ultraviolet compound;
2) dispersing the anti-ultraviolet composite in deionized water to form a suspension, adding the ferroferric oxide nanowires into the suspension, adding a reducing agent, and carrying out heating reaction to obtain an anti-ultraviolet aerogel composite;
3) and uniformly mixing the plant fiber, the bamboo powder, the wheat bran, the paraffin, the ultraviolet-resistant aerogel compound and the urea-formaldehyde resin adhesive, paving, prepressing and carrying out hot-pressing treatment to obtain the ultraviolet-resistant fiberboard.
In a specific embodiment, step 1) is specifically performed as follows:
s1) slowly adding butyl titanate into absolute ethyl alcohol, uniformly mixing by magnetic stirring to obtain solution A, adding graphene oxide during distillation, oscillating in water bath to form graphene oxide solution, adding the graphene oxide solution into the absolute ethyl alcohol, and adjusting the pH value of glacial acetic acid to be less than 3 after magnetic stirring to obtain solution B for later use;
s2) keeping the liquid B to be stirred continuously, slowly dripping the liquid A into the liquid B, continuing to react after the dripping is finished, stopping stirring, treating in a constant-temperature water bath to obtain gel, drying the gel, grinding, placing in a resistance furnace, heating, and cooling to room temperature to obtain the anti-ultraviolet compound.
According to the invention, butyl titanate is taken as a precursor of titanium, graphene oxide is taken as a raw material, the graphene oxide has abundant hydrophilic oxygen-containing functional groups such as hydroxyl groups and epoxy groups, and can provide sites for titanium dioxide generated by titanium source in-situ hydrolysis, the graphene oxide is reduced by adopting a sol-gel method and heat treatment, so that the ultraviolet-resistant composite with ultraviolet resistance is provided, and the formed ultraviolet-resistant composite has good ultraviolet-scattering and ultraviolet-absorbing capabilities, so that the damage of ultraviolet rays to a fiber board is reduced, the aging rate of the fiber board under the ultraviolet rays is slowed down, and the outdoor use performance of the fiber board is enhanced.
Further, in S1), the ratio of the butyl titanate to the absolute ethyl alcohol in the solution A is 160 mL-100: 500 mL-350.
Further, in S1), the magnetic stirring time is 10-20 min.
Further, in S1), the particle size of the graphene oxide is 1 to 5 μm.
Further, in S1), the ratio of the graphene oxide, the distilled water, the absolute ethyl alcohol and the glacial acetic acid in the solution B is 3-10g, 160mL, 350mL, 500mL and 40-52 mL.
Further, in S1), the water bath temperature is 60-70 ℃.
Further, in S1), the oscillation power is 200-300W, and the time is 1-3 h.
Further, in S2), the rotation speed of the continuous stirring is 30-80 r/min.
Further, in S2), the continuous reaction time is 0.5-2.0 h.
Further, in S2), the temperature of the thermostatic water bath is 45-50 ℃, and the water bath treatment is carried out for 30-60 min.
Further, in S2), the drying temperature is 105 ℃ and 110 ℃, and the drying time is 3-7 h.
Further, in S2), the heating temperature is 450-470 ℃ for 2-5 h.
Further, in S2), the particle size of the uvioresistant compound is 5-15 μm.
In a specific embodiment, step 2) specifically operates as follows:
adding an anti-ultraviolet compound into deionized water to form a suspension, adding ferroferric oxide nanowires into the suspension, performing ultrasonic treatment to obtain a dispersion, adding ascorbic acid into the dispersion, uniformly mixing, sealing in an autoclave, performing heating reaction, cooling to room temperature, repeatedly washing a product ethanol, freezing, crushing, grinding, and performing vacuum drying to obtain the anti-ultraviolet aerogel compound.
In order to enable the anti-ultraviolet compound to have long-acting anti-ultraviolet performance and prevent the reduction of the anti-ultraviolet performance caused by the loss of the titanium dioxide, the anti-ultraviolet compound is subjected to secondary treatment, the graphene oxide in the anti-ultraviolet compound is reduced by using a reducing agent through a chemical reduction method so as to gelatinize a solution of the graphene oxide, and the graphene oxide is self-assembled into a three-dimensional reticular graphene hydrogel, along with the increase of the reduction degree of the graphene oxide, oxygen-containing group energy groups on the graphene oxide are reduced, so that the titanium dioxide gradually drops, the dropped titanium dioxide falls into the three-dimensional reticular structure of the graphene hydrogel, and the introduced ferroferric oxide nanowires have a one-dimensional overlong structure and form an interpenetrating structure with the graphene hydrogel, so that the ferroferric oxide nanowires exist in and out of the graphene hydrogel, wherein the ferroferric oxide nanowires embedded in the graphene hydrogel can play a role in limiting and fixing, the flow migration of the titanium dioxide is inhibited, so that the loss of the titanium dioxide is reduced, and the retention rate of the titanium dioxide in the ultraviolet-resistant aerogel composite is improved, so that the ultraviolet-resistant aerogel composite has long-acting ultraviolet resistance; meanwhile, the ferroferric oxide nanowires exposed outside the graphene hydrogel play a role of bridging, and the ferroferric oxide nanowires can be intertwined with plant fibers to form firm combination with the plant fibers, so that the loss of the ultraviolet-resistant aerogel compound is reduced, the retention rate of the ultraviolet-resistant aerogel compound in the fiber board is improved, the fiber board has long-acting ultraviolet resistance, and the fiber board can be suitable for outdoor environments for a long time.
Further, the concentration of the suspension is 2-5 mg/mL.
Further, the proportion of the ferroferric oxide nanowire, the suspension and the ascorbic acid is 400mg to 80-130mL to 400 mg.
Further, the ultrasonic treatment power is 200-300W, and the treatment time is 20-50 min.
Further, the heating reaction temperature is 90-95 ℃, and the reaction time is 3-5 h.
Further, the freezing temperature is-50 to-60 ℃, and the freezing time is 10 to 15 hours.
Further, the vacuum degree of the vacuum drying is 0.1-1.0KPa, the temperature is 50-80 ℃, and the time is 3-10 h.
Further, the particle size of the uvioresistant aerogel composite is 20-50 microns.
Further, the preparation method of the ferroferric oxide nanowire comprises the following steps:
mixing ferrous sulfate and sodium thiosulfate, then transferring into a hydrothermal reaction kettle, adding a PEG (polyethylene glycol) aqueous solution, adding sodium hydroxide, carrying out hydrothermal reaction after complete sealing, cooling to room temperature after the reaction is finished, carrying out centrifugal washing on the obtained product, and carrying out freeze drying to obtain the ferroferric oxide nanowire.
Furthermore, the ratio of the ferrous sulfate, the sodium thiosulfate, the PEG aqueous solution and the sodium hydroxide is 40-70mmmoL:20-35mmoL: 100-.
Furthermore, in the PEG aqueous solution, the volume ratio of PEG to water is 1: 3.0-3.5.
Furthermore, the hydrothermal reaction temperature is 180-.
Furthermore, the temperature of the freeze drying is-30 to-50 ℃, and the drying time is 12 to 16 hours.
In a specific embodiment, step 3) is specifically performed as follows:
putting the plant fiber, the bamboo powder, the wheat bran and the paraffin into a stirrer, adding the uvioresistant aerogel compound into the urea-formaldehyde resin adhesive, stirring at a high speed, uniformly mixing, spraying into the stirrer, uniformly stirring, paving, putting into a prepress for prepressing, and then transferring into a hot press for hot pressing to obtain the uvioresistant fiberboard.
Further, relative to 100 parts by weight of plant fiber, 5-10 parts by weight of bamboo powder, 10-20 parts by weight of wheat bran, 5-10 parts by weight of paraffin, 5-10 parts by weight of anti-ultraviolet aerogel compound and 20-30 parts by weight of urea-formaldehyde resin glue.
Furthermore, the solid content of the urea-formaldehyde resin adhesive is 50-60%.
Further, the high-speed stirring speed is 1000-.
Furthermore, the pre-pressing pressure is 0.8-1.3Mpa, and the pre-pressing time is 20-40 s.
Further, the hot-pressing temperature is 100-.
Compared with the prior art, the invention has the following advantages:
in the prior art, a vacuum impregnation method is generally adopted to fill nanoparticles with an ultraviolet resistance function into a porous carrier so as to obtain a substance with the ultraviolet resistance function, but in the above process, the depth of the nanoparticles filled into the carrier is shallow, and a large number of nanoparticles exist in a shallow layer structure of the carrier, so that the retention rate of the nanoparticles in the carrier is gradually reduced in the use process, the ultraviolet resistance performance of the carrier is gradually reduced, and the long-acting effect cannot be realized; aiming at the defects in the prior art, titanium dioxide particles are loaded on the surface of graphene oxide firstly, then the graphene oxide is subjected to reduction treatment, the graphene oxide is self-assembled into three-dimensional reticular graphene hydrogel, the titanium dioxide particles loaded on the surface of the graphene oxide gradually fall off by utilizing the increase of the reduction degree of the graphene oxide and fall into the three-dimensional reticular structure of the graphene hydrogel, so that the titanium dioxide particles are filled in the deep of the porous structure of the graphene hydrogel, the improvement of the retention rate of the titanium dioxide is realized, the fiberboard has long-acting ultraviolet resistance, and the fiberboard can be suitable for the outdoor environment for a long time.
Detailed Description
Example 1
An ultraviolet-resistant fiberboard for outdoor decoration is prepared by the following specific steps:
1) slowly adding 100mL of butyl titanate into 350mL of absolute ethyl alcohol, magnetically stirring for 10min, uniformly mixing to obtain solution A, adding 3g of graphene oxide with the particle size of 1 mu m into 100mL of distilled water, carrying out ultrasonic oscillation for 1h at the temperature of 60 ℃ in a water bath by 200W to form a graphene oxide solution, adding the graphene oxide solution into 350mL of absolute ethyl alcohol, magnetically stirring for 10min, and adding 40mL of glacial acetic acid to obtain solution B for later use;
2) keeping the liquid B to be continuously stirred at 30r/min, slowly dripping the liquid A into the liquid B, continuously reacting for 0.5 after dripping is finished, stopping stirring, carrying out constant-temperature water bath at 45 ℃ for 30min to obtain gel, drying the gel at 105 ℃ for 3h, grinding, placing in a resistance furnace, carrying out heat treatment at 450 ℃ for 2h, and cooling to room temperature to obtain an anti-ultraviolet compound with the particle size of 5 mu m;
3) mixing 40mmoL ferrous sulfate and 20mmoL sodium thiosulfate, then transferring into a hydrothermal reaction kettle, adding 100mLPEG aqueous solution, wherein the volume ratio of PEG to water is 1:3, then adding 500mmoL sodium hydroxide, completely sealing, reacting at 180 ℃ for 3 hours, cooling to room temperature after the reaction is finished, centrifugally washing the obtained product, and freeze-drying at-30 ℃ for 12 hours to obtain the ferroferric oxide nanowire;
4) adding an anti-ultraviolet compound into deionized water to form a suspension with the concentration of 2mg/mL, adding 100mg of ferroferric oxide nanowires into 80mL of the suspension, carrying out ultrasonic treatment for 20min at 200W to obtain a dispersion, adding 400mg of ascorbic acid into the dispersion, uniformly mixing, sealing in an autoclave, heating at 90 ℃ for 3h, cooling to room temperature, repeatedly washing a product ethanol, freezing at-50 ℃ for 10h, crushing, grinding, and carrying out vacuum drying at 0.1KPa and 50 ℃ for 3h to obtain an anti-ultraviolet aerogel compound with the particle size of 20 microns;
5) putting 100 parts of plant fiber, 5 parts of bamboo powder, 10 parts of wheat bran and 5 parts of paraffin into a stirrer, adding 5 parts of an anti-ultraviolet aerogel compound into 20 parts of urea-formaldehyde resin adhesive with the solid content of 50%, stirring at a high speed of 1000r/min for 10min, uniformly mixing, spraying into the stirrer, uniformly stirring, paving, putting into a prepressing machine for prepressing (the prepressing pressure is 0.8MPa, the prepressing time is 20 s), and then transferring into a hot press for hot pressing (the hot pressing temperature is 100 ℃, the hot pressing time is 30s/mm, and the hot pressing pressure is 0.5 MPa), so as to obtain the anti-ultraviolet fiberboard.
Example 2
An ultraviolet-resistant fiberboard for outdoor decoration is prepared by the following specific steps:
1) slowly adding 130mL of butyl titanate into 400mL of absolute ethyl alcohol, magnetically stirring for 15min, uniformly mixing to obtain a solution A, adding 6g of graphene oxide with the particle size of 5 microns into 130mL of distilled water, carrying out ultrasonic oscillation for 2h at the temperature of 65 ℃ in a water bath by 200W to form a graphene oxide solution, adding the graphene oxide solution into 400mL of absolute ethyl alcohol, magnetically stirring for 15min, adding 45mL of glacial acetic acid to obtain a solution B for later use;
2) keeping the liquid B to be continuously stirred at 50r/min, slowly dripping the liquid A into the liquid B, continuously reacting for 1.5h after dripping is finished, stopping stirring, carrying out 50-DEG C constant-temperature water bath for 50min to obtain gel, drying the gel for 5h at 110 ℃, grinding, placing in a resistance furnace, carrying out heat treatment for 3h at 460 ℃, and cooling to room temperature to obtain an anti-ultraviolet compound with the particle size of 10 mu m;
3) mixing 50mmoL ferrous sulfate and 25mmoL sodium thiosulfate, then transferring the mixture into a hydrothermal reaction kettle, adding 140mLPEG aqueous solution, wherein the volume ratio of PEG to water is 1:3.2, then adding 560mmoL sodium hydroxide, completely sealing, reacting for 5 hours at 185 ℃, cooling the mixture to room temperature after the reaction is finished, centrifugally washing the obtained product, and freeze-drying for 15 hours at-40 ℃ to obtain the ferroferric oxide nanowire;
4) adding an anti-ultraviolet compound into deionized water to form a suspension with the concentration of 3mg/mL, adding 200mg of ferroferric oxide nanowires into 100L of the suspension, carrying out ultrasonic treatment for 30min at 200W to obtain a dispersion, adding 600mg of ascorbic acid into the dispersion, uniformly mixing, sealing in an autoclave, heating at 90 ℃ for 5h, cooling to room temperature, repeatedly washing a product ethanol, freezing at-55 ℃ for 15h, crushing, grinding, and carrying out vacuum drying at 0.1KPa and 70 ℃ for 5h to obtain an anti-ultraviolet aerogel compound with the particle size of 30 mu m;
5) putting 100 parts of plant fiber, 6 parts of bamboo powder, 15 parts of wheat bran and 7 parts of paraffin into a stirrer, adding 8 parts of an anti-ultraviolet aerogel compound into 25 parts of urea-formaldehyde resin adhesive with the solid content of 60%, stirring at a high speed of 1300r/min for 15min, uniformly mixing, spraying into the stirrer, uniformly stirring, paving, putting into a prepressing machine for prepressing (the prepressing pressure is 0.8MPa, the prepressing time is 40 s), and then transferring into a hot press for hot pressing (the hot pressing temperature is 120 ℃, the hot pressing time is 50s/mm, and the hot pressing pressure is 0.8 MPa) to obtain the anti-ultraviolet fiberboard.
Example 3
An ultraviolet-resistant fiberboard for outdoor decoration is prepared by the following specific steps:
1) slowly adding 160mL of butyl titanate into 500mL of absolute ethyl alcohol, magnetically stirring for 20min, uniformly mixing to obtain solution A, adding 10g of graphene oxide with the particle size of 5 microns into 160mL of distilled water, carrying out ultrasonic oscillation for 3h at 70 ℃ in a water bath by 300W to form a graphene oxide solution, adding the graphene oxide solution into 500mL of absolute ethyl alcohol, magnetically stirring for 20min, and adding 52mL of glacial acetic acid to obtain solution B for later use;
2) keeping the liquid B to be continuously stirred at the speed of 80r/min, slowly dripping the liquid A into the liquid B, continuously reacting for 2.0h after dripping is finished, stopping stirring, carrying out constant-temperature water bath at the temperature of 50 ℃ for 60min to obtain gel, drying the gel at the temperature of 110 ℃ for 7h, grinding, placing the gel in a resistance furnace, carrying out heat treatment at the temperature of 470 ℃ for 5h, and cooling to room temperature to obtain an anti-ultraviolet compound with the particle size of 15 mu m;
3) mixing 70mmoL ferrous sulfate and 35mmoL sodium thiosulfate, then transferring into a hydrothermal reaction kettle, adding 160mLPEG aqueous solution, wherein the volume ratio of PEG to water is 1:3.5, then adding 620mmoL sodium hydroxide, completely sealing, reacting at 186 ℃ for 7 hours, cooling to room temperature after the reaction is finished, centrifugally washing the obtained product, and freeze-drying at-50 ℃ for 16 hours to obtain the ferroferric oxide nanowire;
4) adding an anti-ultraviolet compound into deionized water to form a suspension with the concentration of 4mg/mL, adding 400mg of ferroferric oxide nanowires into 120mL of the suspension, carrying out ultrasonic treatment for 50min at 300W to obtain a dispersion, adding 1000mg of ascorbic acid into the dispersion, uniformly mixing, sealing in an autoclave, heating at 95 ℃ for 5h, cooling to room temperature, repeatedly washing a product ethanol, freezing at-60 ℃ for 15h, crushing, grinding, and carrying out vacuum drying at 1.0KPa and 80 ℃ for 10h to obtain an anti-ultraviolet aerogel compound with the particle size of 50 mu m;
5) putting 100 parts of plant fiber, 10 parts of bamboo powder, 20 parts of wheat bran and 10 parts of paraffin into a stirrer, adding 10 parts of an anti-ultraviolet aerogel compound into 30 parts of urea-formaldehyde resin adhesive with the solid content of 60%, stirring at a high speed of 1500r/min for 20min, uniformly mixing, spraying into the stirrer, uniformly stirring, paving, putting into a prepressing machine for prepressing (the prepressing pressure is 1.3Mpa and the prepressing time is 40 s), and then transferring into a hot press for hot pressing (the hot pressing temperature is 130 ℃, the hot pressing time is 60s/mm and the hot pressing pressure is 1.0 MPa) to obtain the anti-ultraviolet fiberboard.
Control group:
the preparation method of the common fiber board comprises the following steps:
according to the weight parts, 100 parts of plant fiber, 10 parts of bamboo powder, 20 parts of wheat bran and 10 parts of paraffin are placed in a stirrer, 30 parts of urea-formaldehyde resin adhesive with the solid content of 60% are sprayed into the stirrer, the mixture is uniformly stirred and paved, then the mixture is placed in a prepress for prepressing (the prepressing pressure is 1.3Mpa and the prepressing time is 40 s), and then the mixture is moved into a hot press for hot pressing (the hot pressing temperature is 130 ℃, the hot pressing time is 60s/mm and the hot pressing pressure is 1.0 MPa), so that the common fiberboard is obtained.
Comparative example:
the conventional uvioresistant fiber board is prepared by the following steps:
the common fiberboard in the control group was treated by the process method provided in example 1 of patent No. CN2016105348956 to obtain the conventional ultraviolet resistant fiberboard.
The fiberboard samples provided in examples 1 to 3 and the control and comparative examples were placed in an ultraviolet box and the resistance of the samples to ultraviolet rays was evaluated by measuring the color change of the surface of the samples under irradiation of an ultraviolet lamp. Wherein, the sample is tested by a spectrophotometer to change the surface brightness (Delta L), the red-green chroma (Delta a) and the yellow-blue chroma (Delta b) after 6 weeks of ultraviolet irradiation, and the color change (Delta E) is calculated according to the following formula:
the test results are shown in table one:
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (9)
1. An ultraviolet-resistant fiberboard for outdoor decoration is characterized in that the preparation method comprises the following steps:
1) mixing graphene oxide and butyl titanate, performing constant-temperature water bath treatment, and performing heat treatment to obtain an anti-ultraviolet compound;
2) dispersing the anti-ultraviolet composite in deionized water to form a suspension, adding the ferroferric oxide nanowires into the suspension, adding a reducing agent, and carrying out heating reaction to obtain an anti-ultraviolet aerogel composite;
3) and uniformly mixing the plant fiber, the bamboo powder, the wheat bran, the paraffin, the ultraviolet-resistant aerogel compound and the urea-formaldehyde resin adhesive, paving, prepressing and carrying out hot-pressing treatment to obtain the ultraviolet-resistant fiberboard.
2. The ultraviolet-resistant fiberboard for outdoor decoration as claimed in claim 1, wherein the amount ratio of the graphene oxide to the butyl titanate is 3-10g:100-160 mL.
3. The ultraviolet resistant fiberboard for outdoor decoration according to claim 1, wherein the constant temperature water bath treatment temperature is 45-50 ℃ and the treatment time is 30-60 min.
4. The ultraviolet-resistant fiber board for outdoor decoration as claimed in claim 1, wherein the heat treatment temperature is 450 ℃ and 470 ℃, and the treatment time is 2-4 h.
5. The ultraviolet resistant fiberboard of claim 1, wherein the suspension has a concentration of 2 to 5 mg/mL.
6. The ultraviolet-resistant fiberboard for outdoor decoration according to claim 1, wherein the ratio of the ferroferric oxide nanowires, the suspension and the reducing agent is 10-40mg:8-13mL:40-100 mg.
7. The ultraviolet-resistant fiberboard of claim 1, wherein the reducing agent is at least one of sodium citrate, sodium bisulfite and ascorbic acid.
8. The ultraviolet resistant fiberboard for outdoor decoration according to claim 1, wherein the heating reaction temperature is 90-95 ℃ and the reaction time is 3-5 h.
9. The ultraviolet resistant fiberboard of claim 1, wherein the ultraviolet resistant aerogel composite comprises, based on 100 parts by weight of the plant fiber, 5 to 10 parts by weight of bamboo powder, 10 to 20 parts by weight of wheat bran, 5 to 10 parts by weight of paraffin, 5 to 10 parts by weight of the ultraviolet resistant aerogel composite, and 20 to 30 parts by weight of urea-formaldehyde resin glue.
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