CN118344774A - A super-weather-resistant light-cured wood coating and its use method - Google Patents
A super-weather-resistant light-cured wood coating and its use method Download PDFInfo
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- CN118344774A CN118344774A CN202410367118.1A CN202410367118A CN118344774A CN 118344774 A CN118344774 A CN 118344774A CN 202410367118 A CN202410367118 A CN 202410367118A CN 118344774 A CN118344774 A CN 118344774A
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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
- C09D109/00—Coating compositions based on homopolymers or copolymers of conjugated diene hydrocarbons
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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
- B05D3/02—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 by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
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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
- B05D3/02—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 by baking
- B05D3/0254—After-treatment
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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
- B05D3/06—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 by exposure to radiation
- B05D3/061—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 by exposure to radiation using U.V.
- B05D3/065—After-treatment
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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
- B05D7/08—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 using synthetic lacquers or varnishes
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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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention relates to a super weather-resistant photo-curing wood coating and a use method thereof, wherein the method comprises the following steps: providing a wood, wherein the wood at least comprises a first position and a second position; heating a first location of the wood; coating the super-weather-resistant photo-curing wood coating on the first position and the second position of the wood, wherein the super-weather-resistant photo-curing wood coating comprises a photo-curing component and a heat-curing component, and the ratio of the photo-curing component to the heat-curing component is 1: (0.1 to 0.5); the first location and the second location are irradiated with low ultraviolet light. The photo-curing component and the heat curing component at the first position are subjected to double crosslinking, so that the overall crosslinking degree is higher, and the hardness is high; and the photo-curing component at the second position is fully crosslinked, the crosslinking degree of the thermosetting component is lower, so that the overall crosslinking degree is lower, and the flexibility is good, thereby realizing that the first position and the second position have different crosslinking degrees.
Description
Technical Field
The invention relates to the technical field of wood coating, in particular to super weather-resistant photo-curing wood coating and a using method thereof.
Background
The wood lacquer is a resin lacquer used on wood products, the wood lacquer has high crosslinking degree, so that the wood lacquer has better hardness to resist impact, scratch and the like, and the wood lacquer has better flexibility due to low crosslinking degree, so that the wood lacquer is not easy to crack when the wood is bent. Because the stress conditions of all the positions of the woodware are different, different hardness and flexibility are often required for different positions of the woodware.
At present, UV irradiation is a common mode for curing wood lacquer, and the number and duration of the UV irradiation have remarkable influence on the crosslinking degree of the lacquer. If UV irradiation is performed only once, it is difficult to ensure that the desired and different degree of crosslinking is achieved for the individual parts of the lacquer. If the UV curing is carried out for different areas, the paint surface or the wood is easy to damage. Thus, there is a need for a wood coating and method that can easily adjust the degree of crosslinking.
Disclosure of Invention
Based on this, it is necessary to provide a super weather-resistant photo-curing wood coating capable of easily adjusting the crosslinking degree of wood lacquer and a method for using the same.
The application method of the super weather-resistant photo-curing wood coating comprises the following steps:
providing a wood, wherein the wood at least comprises a first position and a second position;
Heating a first location of the wood; specifically, the second location is not heat treated. For example, a first location of the wood is heated using an air heater to heat the first location. Further, the first position of the woodware is heated by covering the positions around the first position with the heat insulation pad and adopting the air duct, so that the first position can be heated more accurately. For another example, a heating plate is used to attach the first location to heat the first location. For another example, the first position of the heating woodware is further a preheating first position, so that when the super-weather-resistant photo-curing woodware coating is coated, heat curing can be started, the super-weather-resistant photo-curing woodware coating is cured faster, and flowing deformation is avoided.
Coating the super-weather-resistant photo-curing wood coating on the first position and the second position of the wood, or respectively coating the super-weather-resistant photo-curing wood coating on the first position and the second position of the wood, wherein the super-weather-resistant photo-curing wood coating comprises a photo-curing component and a heat-curing component, and the ratio of the photo-curing component to the heat-curing component is 1: (0.1-0.5). Wherein the photo-setting component is for curing by UV irradiation and the thermosetting component is for heat curing. For example, the thickness of the super weather-resistant photo-curing wood coating is 30-100 μm, so that the wood coating can be well adhered to the wood surface.
And irradiating the first position and the second position by using low ultraviolet light with the curing energy of 50-60 mj/cm 2, so that the photo-curing component is cured by irradiation of the low ultraviolet light and the thermosetting component is not affected. The penetration of low ultraviolet light is weaker in various frequency bands of ultraviolet light, so that the wood is not easy to damage. For example, the irradiation time of the low ultraviolet light is 20 to 40 seconds, so that the light curing component is cured sufficiently and does not damage the wooden ware. For another example, the light source of the low ultraviolet light is an LED light source, so that the light intensity is low, the wood is not easy to damage, and the first position of the wood still can reach ideal curing hardness through double curing.
According to the application method of the super-weather-resistant photo-curing wood coating, the first position of the wood is heated, and the super-weather-resistant photo-curing wood coating containing the photo-curing component and the thermosetting component is coated on the first position and the second position of the wood. Because the temperature of the first position is higher, the heat curing component at the first position is cured, and then the low ultraviolet light with the curing energy of 50-60 mj/cm 2 is adopted to irradiate the first position and the second position at the same time, so that the light curing components at the first position and the second position are cured, the low ultraviolet light has a small heating effect on wood surface rice, and the heat curing component is not easy to initiate to cure. Thus, the photo-curing component and the thermosetting component at the first position are doubly crosslinked, the overall crosslinking degree is higher, and the hardness is high; the photo-curing component at the second position is fully crosslinked, the crosslinking degree of the thermosetting component is lower, so that the overall crosslinking degree is lower, and the flexibility is good, thereby realizing that the first position and the second position have different crosslinking degrees, and further realizing that the wood coating on the wood surface has different crosslinking degrees according to the requirement. In addition, the method can be used for coating the super weather-resistant photo-curing wood paint once and completing ultraviolet irradiation once, so that the conditions of multiple wood paints, multiple coating and multiple irradiation can be avoided, the whole operation flow is simple, convenient and quick, and the production efficiency is improved.
It should be noted that heating the specified position is easier to achieve than irradiating the specified position with ultraviolet light, and thus the curing of the thermosetting component of the first position can be precisely controlled by heating the first position, thereby adjusting the crosslinking degree of the entire specified position. In the prior art, the wood lacquer needs to be irradiated by medium-high ultraviolet light so as to achieve corresponding high hardness, but the application achieves high hardness at the first position through two crosslinking modes, so that the medium-high ultraviolet light is not required to be irradiated later, but the low ultraviolet light is used for irradiating the wood instead, thereby realizing the solidification of the photo-solidified components, and being capable of being irradiated for a long time without damaging the wood.
For example, the first position and the second position of the wood are uniformly coated with the super-weather-resistant photo-curing wood coating, or the first position and the second position of the wood are coated with the super-weather-resistant photo-curing wood coating with the same thickness, so that the wood coating with the same thickness can be formed after being cured, and the wood coating with the first position and the second position can have different crosslinking degrees by preheating the first position.
In one embodiment, the first location comprises a plane of the wood. The plane of the wood needs to have higher hardness, and two crosslinking modes are realized at the first position, so that the hardness of the wood coating at the plane of the wood is improved.
In one embodiment, the second location comprises a curved surface of the wood. The curved surface of the wood is curved, and the wood coating is required to have better flexibility, so that the wood coating can be better attached to the curved surface, and therefore, the overall crosslinking degree of the wood coating is lower only by UV curing, and the wood coating at the second position has better flexibility.
In one embodiment, the step of heating the specific location of the wood comprises: and heating the specific position of the wood to 50-80 ℃. Too low a temperature is detrimental to the curing of the heat curable components, whereas higher temperatures can lead to wood damage.
In one embodiment, the photocurable component comprises 60 to 80 parts of polybutadiene (meth) acrylate prepolymer and 2 to 6 parts of photoinitiator. The polybutadiene (methyl) acrylate prepolymer and the photoinitiator can be cured under the irradiation of ultraviolet light, so that the function of a photocuring component is realized. For example, the photoinitiator includes at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1-hydroxycyclohexyl phenyl ketone.
In one embodiment, the heat curing component includes 50 to 70 parts of polyurethane resin and 1 to 5 parts of thermal initiator. The polyurethane resin can realize heat curing, so that double curing is realized by matching with a light curing component. For example, the thermal initiator includes at least one of azobisisobutyronitrile and benzoyl peroxide.
In one embodiment, the super weather-proof photo-curing wood coating also comprises 0.5 to 2 parts of amine accelerator, 10 to 25 parts of acrylic ester diluent, 1 to 5 parts of pigment and 0.5 to 1 part of flatting agent. The amine accelerator can accelerate the reaction of the photo-curing component, shorten the curing time and improve the photo-curing efficiency, for example, the amine catalyst comprises at least one of N, N-dimethylbenzylamine, triethylamine, tetrabutylammonium bromide and triethanolamine. The acrylic diluent can adjust the viscosity of the super weather-resistant photo-curing wood coating so that the super weather-resistant photo-curing wood coating can easily form a uniform coating when being coated, for example, the acrylic diluent comprises at least one of methyl methacrylate, butyl acrylate, trimethylolpropane triacrylate, 1, 6-hexanediol diacrylate and pentaerythritol triacrylate. The pigment is used for adjusting the color of the super weather-proof photo-curing wood coating. The leveling agent can reduce the surface tension of the wood coating, so that the coating has a flat and smooth surface.
In one embodiment, the super weather-resistant photo-curing wood coating also comprises 0.1-1 part of catalyst, wherein the catalyst can increase the reaction rate of photo-curing and thermal-curing.
In one embodiment, the photo-curing component comprises a photo-initiator and the thermal curing component comprises a thermal initiator, wherein the weight ratio of the photo-initiator to the thermal initiator is 1: (0.1-0.5), wherein the super weather-resistant photo-curing wood coating also comprises polyethylene glycol modified epoxy acrylic resin and polyurethane modified epoxy acrylate. After the polyethylene glycol modified epoxy propylene resin and the polyurethane modified epoxy acrylic ester are mixed, the UV curing can be carried out under the guidance of a photoinitiator, and the thermal curing can also be carried out under the guidance of a thermal initiator, so that the dual curing is realized, wherein the polyethylene glycol modified epoxy propylene resin comprises epoxy resin, polyethylene glycol and acrylic acid. The polyurethane modified epoxy acrylate resin comprises epoxy resin, diisocyanate, oxygen inhibitor and acrylic acid.
The super weather-proof photo-curing wood coating comprises 40-60 parts of photo-curing components and 10-40 parts of thermosetting components, wherein the super weather-proof photo-curing wood coating is used for coating the wood which is heated at part of the positions and is matched with low ultraviolet light with the curing energy of 50-60 mj/cm 2.
The super weather-resistant photo-curing wood coating can realize photo-curing and thermal curing, and can realize double crosslinking when being coated at a heating position and irradiated by UV, so that the wood coating has high crosslinking degree and high hardness. And when the wood coating is coated at a position which is not heated, only photo-curing is realized, so that the wood coating has low crosslinking degree and good flexibility. Thus, the wood coating on the wood surface can be realized to have different crosslinking degrees according to the requirement. In addition, the coating is only needed to be coated once for super weather-proof photo-curing wood coating and one ultraviolet irradiation is completed, and multiple wood coatings, multiple coatings and multiple irradiations are not needed, so that the whole operation flow is simple, convenient and quick, and the production efficiency is improved.
Detailed Description
The present application will be described more fully hereinafter in order to facilitate an understanding of the present application. This application may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1:
the application method of the super weather-resistant photo-curing wood coating comprises the following steps:
S1: a wood article is provided, the wood article including a first location and a second location. In this embodiment, the wooden article includes a first rectangular block of 100mm×100mm×5mm and a second rectangular block of 200mm×100mm×20mm connected to both sides of the first rectangular block. The first rectangular block is a first position of the woodware, and the two second rectangular blocks are second positions of the woodware.
S2: and heating the first position of the wood. Specifically, the heat insulation pad is adopted to shield the outer side of the first position, and the air duct is used for blowing heat to the first position so as to heat the first position of the wood.
S3: coating the super-weather-resistant photo-curing wood coating with the thickness of 50 microns on the first position and the second position of the wood, wherein the super-weather-resistant photo-curing wood coating comprises a photo-curing component and a heat-curing component, and the ratio of the photo-curing component to the heat-curing component is 1:0.1. wherein the photo-curing component comprises 60 parts of polybutadiene (methyl) acrylate prepolymer and 2 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone photoinitiator. The thermosetting component comprises 50 parts of polyurethane resin and 1 part of azodiisobutyronitrile thermal initiator. Wherein the super weather-proof photo-curing wood coating also comprises 0.5 part of triethylamine accelerator, 10 parts of ethyl acetate diluent, 0.5 part of phthalocyanine blue and 0.5 part of titanium dioxide pigment respectively, and 0.5 part of polydimethylsiloxane flatting agent. Specifically, in this example, 2-hydroxy-2-methyl-1-phenyl-1-propanone photoinitiator was gradually added to the prepolymer at 25℃and stirred for 15 minutes to give mixture A. Then, triethylamine accelerator, ethyl acetate diluent, phthalocyanine blue and titanium dioxide were added to the mixture A one by one at 40℃with stirring for 5 minutes each time, to obtain a mixture C. And adding polyurethane resin and azodiisobutyronitrile at 50 ℃, and stirring for 30 minutes to obtain the super weather-resistant photo-curing wood coating.
S4: and irradiating the first position and the second position by adopting low ultraviolet light with the curing energy of 50mj/cm 2, wherein the irradiation time is 30s.
Example 2: the difference from example 1 is that the ratio of the photo-setting component and the thermosetting component is 1:0.5. wherein the photo-curing component comprises 80 parts of polybutadiene (methyl) acrylate prepolymer and 6 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone photoinitiator. The thermosetting component comprises 70 parts of polyurethane resin and 5 parts of azodiisobutyronitrile thermal initiator. Wherein the super weather-proof photocuring wood coating also comprises 2 parts of triethylamine accelerator, 25 parts of ethyl acetate diluent, 2.5 parts of phthalocyanine blue and 1 part of polydimethylsiloxane flatting agent. The curing energy of the low ultraviolet light in this embodiment is 60mj/cm 2.
Example 3 differs from example 1 in that the ratio of the photocurable component to the thermosetting component is 1:0.2. wherein the photo-curing component is 70 parts of polybutadiene (methyl) acrylate prepolymer and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone photoinitiator. The thermosetting component is 60 parts of polyurethane resin and 3 parts of azodiisobutyronitrile thermal initiator. Wherein the super weather-proof photocuring wood coating also comprises 1.2 parts of triethylamine accelerator, 22 parts of ethyl acetate diluent, 2 parts of phthalocyanine blue and 2 parts of titanium dioxide pigment respectively, and 0.8 part of polydimethylsiloxane flatting agent. The low UV curing energy in this embodiment is 55mj/cm 2.
Comparative example 1 differs from example 1 in that the step of heating the first location is not included.
Comparative example 2: 60 parts of polybutadiene (methyl) acrylate prepolymer and 2 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone photoinitiator are coated on the wood, and ultraviolet light with the curing energy of 70mj/cm 2 is used for irradiating the wood.
Comparative example 3: the difference from example 1 is that the curing energy of the ultraviolet light is 70mj/cm 2.
In the photocuring process of each example and comparative example, a temperature measuring gun is used for detecting the surface temperature of the wood, five points are measured and averaged, and the finished products of each example and comparative example are subjected to hardness test and flexibility test.
The hardness test method is as follows: grinding the pencil on abrasive paper vertically to form a sharp plane edge; holding the pencil at an angle of 45 degrees, and applying a certain force to push the coating of the pencil at the first position and the second position to draw a straight line; sequentially testing from soft to hard; the hardness of the coating film is the hardness of the model before the coating is destroyed, and the pencil hardness is from low to high: 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, and 9H.
The flexibility test method is as follows: repeatedly bending the first position of the woodware for 50 times, wherein the bending angle is 30 degrees, and observing whether cracking occurs on the surface of the woodware coating at the first position by using a 4-time eyepiece.
The following results were obtained:
From the above table, in each embodiment, the hardness of the second position is higher than that of the comparative example, because the super weather-resistant photo-curing woodware of each embodiment has dual curing effects of photo-curing and thermal curing, so that the hardness of the woodware coating of the second position is increased, and the first position of each embodiment is free from cracking and has better flexibility. Specifically, as can be seen from the comparison between each example and comparative example 1, the first position and the second position of comparative example 1 are only photo-cured, so that the hardness of the whole wood is consistent, the crosslinking degree required by the wood coating cannot be adjusted according to different positions, and the comparative example 1 is only photo-cured by low ultraviolet light, and the hardness of the second position is too low, which is not beneficial to protecting the wood. As is apparent from the comparison of examples and comparative example 2, comparative example 2 only contains a photo-curing component and is integrally photo-cured only by ultraviolet light of higher energy, which shows the use state of the prior art wood coating, the degree of crosslinking of the wood coating at different positions cannot be adjusted as required, and the hardness at the second position of comparative example 2 is inferior to that of examples because comparative example 2 is photo-cured only, the degree of crosslinking is lower than that of examples, and the hardness at the first position of comparative example 2 is higher, resulting in poor flexibility at the first position and cracking after bending. As is clear from the comparison between example 1 and comparative example 3, the energy of the ultraviolet light of comparative example 3 is relatively high, so that the surface temperature of the wooden article is excessively increased when the ultraviolet light is irradiated, the thermosetting component is also heated to be cured, and finally, the thermosetting component and the photo-curing component are completely cured, so that the effect of different crosslinking degrees cannot be exhibited on a single wooden article, and it is seen that curing of the thermosetting component can be avoided only by using low ultraviolet light irradiation of 50mj/cm 2, so that different crosslinking degrees are realized on a single wooden article at different positions. Further, as can be seen from comparison of the examples, the example 3 adopts better component matching and parameter conditions, so that the hardness of the second position is higher, the hardness of the first position is also higher, the first position is not easy to crack, the hardness and flexibility are both considered, and the super weather-resistant photo-curing wood coating is better adapted to wood.
Therefore, by adopting the method, different crosslinking degrees of different positions of the woodware can be realized, specifically, the first position is the position of the woodware which does not need to be stressed, the woodware can be protected from being influenced by collision, the second position is the position of the woodware which is easy to bend under stress, the positions are often bent due to stress, good flexibility is needed, and the phenomenon of cracking after frequent bending of the positions is avoided. The method can easily realize that different positions have different crosslinking degrees so as to meet the requirements of hardness or flexibility of different positions of the woodware.
It is worth mentioning that, the embodiment adopts low ultraviolet light to carry out UV irradiation to the woodware, and low ultraviolet light's energy is lower, can not damage the surface of woodware, and adopts low ultraviolet light to carry out UV solidification and then cooperate the thermosetting, can realize under the prerequisite of not using middle-high ultraviolet light that the second position possesses higher crosslinking degree to make the woodware coating of second position reach required hardness, realized simultaneously through light solidification and thermosetting woodware coating of different positions and have different crosslinking degree.
Further, different temperatures may be preheated on the surface of the wood, for example, the wood has a first position, a second position and a third position, the first position is heated to the first temperature, the third position is heated to the third temperature, wherein the temperatures of the first position and the third position are different, so that the cross-linking degree of the thermosetting components are different, then the super-weather-resistant photo-curing wood coating is coated and the low ultraviolet light is irradiated, and thus, the first position, the second position and the third position all have different cross-linking degrees. Still further, the heat curable component comprises two components having different cross-linking temperatures, e.g., the heat curable component comprises component a and component B, the cross-linking temperature of component a being lower than the cross-linking temperature of component B, such that when the wood is heated to a temperature above the cross-linking temperature of component a and below the cross-linking temperature of component B, component a cures. When the heating temperature of the wood is higher than the crosslinking temperature of the component B, the component A and the component B are cured simultaneously. Thus, the crosslinking degree of the thermosetting component can be adjusted according to different temperatures so as to realize different crosslinking degrees at various positions on the wood.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
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