CN111715492A - Coating process of finishing varnish on integrated board - Google Patents
Coating process of finishing varnish on integrated board Download PDFInfo
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- CN111715492A CN111715492A CN201910207322.6A CN201910207322A CN111715492A CN 111715492 A CN111715492 A CN 111715492A CN 201910207322 A CN201910207322 A CN 201910207322A CN 111715492 A CN111715492 A CN 111715492A
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- curing
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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
- B05D3/02—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
- B05D3/0263—After-treatment with IR heaters
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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
- B05D3/067—Curing or cross-linking the coating
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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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/53—Base coat plus clear coat type
- B05D7/534—Base coat plus clear coat type the first layer being let to dry at least partially before applying the second layer
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention belongs to the field of coating processes of finish varnish, and particularly discloses a coating process of the finish varnish on an integrated board, which comprises drying and curing, wherein the drying comprises dehydration flash drying and post-treatment heat treatment, the dehydration flash drying is rapid dehydration treatment before curing, and the post-treatment heat treatment is heating treatment after curing. The coating process is suitable for the field of the outer wall integrated plate, and has the advantages of good coating effect, high paint adhesion and small color difference.
Description
Technical Field
The invention belongs to the field of coating process, and particularly relates to a coating process of finishing varnish on an integrated board.
Background
At present, the water-based UV coating is mainly applied to the field of wood floors and furniture, and can not be widely applied due to application difficulties of novel composite materials, flexible veneering materials, inorganic plates and the like when being applied to prefabricated integrated plates for external walls. The main reason is that when applied to exterior wall integrated panels, the requirements for aqueous UV coatings are higher, as detailed in the following: 1) the weather resistance (yellowing resistance and stain resistance) is higher due to the outdoor use; 2) because the base material on the integrated board is mainly colorful, real stone paint and texture, the density of the base material is greatly higher than that of wood, and compared with wood, the water-based UV coating is more difficult to permeate on the base material. The existing common water-based UV coating process can cause poor coating adhesion, large color difference after 2000h of ultraviolet irradiation and irrational coating effect. The coating process adopting the two-component polyurethane coating has poor coating adhesion, the production time is more than 4 hours, and the working efficiency is low. Application number 201110119143.0 provides an ultraviolet curing coating melamine lagging roller coating construction method, which comprises the following steps: the construction method has the advantages of high production efficiency, no cracking at low temperature or high temperature after coating, good adhesive force, high surface hardness and good paint film fullness. However, the method is only suitable for the fields of wood boards and furniture, and the problems of large chromatic aberration and poor adhesion force still occur when the method is applied to the field of integrated boards of external walls. Therefore, the coating process of the integrated plate for the outer wall, which has the advantages of good coating adhesion, high hardness, small color difference and high production efficiency, needs to be provided.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the coating process of the integrated outer wall plate, which has the advantages of good coating adhesion, high hardness, small color difference and high production efficiency.
In order to solve the technical problems, the invention provides a coating process of finishing varnish on an integrated board, which comprises drying and curing, wherein the drying comprises dehydration flash drying and post-heat treatment, the dehydration flash drying is rapid dehydration drying treatment before curing, and the post-heat treatment is heating drying treatment after photocuring.
In the above-mentioned scheme, since water is used as a dispersion medium of the coating material and cannot participate in the crosslinking reaction of curing, it is necessary to perform curing after dehydration and flash drying. However, since the coating undergoes stress shrinkage after curing, which causes a decrease in the adhesion of the coating, a further post-heat treatment is required after curing. According to the invention, the coating is further subjected to post-heat treatment after being cured, so that the movement capacity of macromolecular reticular polymerization formed after curing is increased, on one hand, the upward stress generated by volume shrinkage in the UV light curing process is eliminated, and the adhesive force between the coating and the base material is improved; on the other hand, the hydrolysis and condensation of organosilane in the system are promoted to improve the crosslinking density of the coating and improve the chemical resistance and hardness of the coating.
Such curing means include, but are not limited to, air oxidation curing, solvent evaporation curing, thermal or chemical reaction curing, radiation (molecular fusion) curing, melt curing, and infrared-catalyzed thermal reaction curing.
Further, the double bond conversion rate of the coating is 85-95%.
Further, the dehydration flash-drying temperature is 45-90 ℃, and the dehydration flash-drying time is 10-40 min;
preferably, the dehydration flash-drying temperature is 50-80 ℃, and the dehydration flash-drying time is 20-30 min.
Further, the temperature of the post heat treatment is 70-100 ℃, and the time of the post heat treatment is 0-15 min;
preferably, the temperature of the post heat treatment is 70-90 ℃, and the time of the post heat treatment is 5-10 min.
Further, the curing is ultraviolet curing under ultraviolet irradiation.
The invention utilizes the medium and short wave (200-450 nm) of UV ultraviolet light to change the photoinitiator in the coating into free radicals or cations under the stimulation of UV radiation, thereby initiating the polymerization of the coating containing active functional groups into insoluble solid coating.
Further, the intensity of ultraviolet light in the ultraviolet light curing process is 600-1500mJ/cm2。
Further, the ultraviolet light intensity in the ultraviolet light curing process is 800-1200mJ/cm2。
Further, the process time in the coating process is less than 55 min.
Further, the coating process comprises the following steps:
(1) and (3) coating a first finishing varnish: uniformly rolling or spraying a layer of finishing varnish on the surface of the substrate;
(2) infrared drying of the first finishing varnish: leveling and drying the substrate roller-coated or sprayed with the finishing varnish in the step (1) by using infrared rays;
(3) and (3) second finishing varnish: uniformly roller-coating or spraying a layer of finishing varnish on the surface of the finish varnish dried by infrared drying in the step (2);
(4) and (3) second infrared drying of finishing varnish: leveling and drying the substrate roller-coated or sprayed with the finishing varnish in the step (3) by using infrared rays;
(5) dewatering and flash drying: placing the substrate dried by the finishing varnish in the step (4) in a drying box for primary drying treatment;
(6) UV light curing: carrying out UV light curing treatment on the substrate dried in the step (5);
(7) and (3) post heat treatment: and (4) placing the substrate cured in the step (6) in a drying oven for post-heating curing treatment.
Furthermore, the substrate comprises real stone paint, flat coating rock color, texture rock color and other novel composite materials, flexible veneering materials, inorganic plates and the like.
The finishing varnish is prepared from the following raw materials in parts by weight:
the finishing varnish of the invention takes the ultraviolet curing aqueous polyurethane dispersoid and the acrylate emulsion as main raw materials, takes the cheap water as the diluent, not only can conveniently control the rheology, but also can ensure that the coating can be used for various coating modes, such as roller coating, curtain coating, spray coating and the like, also avoids the curing shrinkage caused by using a large amount of active diluent, and reduces the problems of toxicity, irritation and the like. Meanwhile, a small amount of silane coupling agent is added, siloxane is hydrolyzed and condensed in the process of drying and film forming of the resin, and a firm cross-linked network (-Si-O-Si-) structure can be formed between polymer molecules and a base material, so that a paint film has strong adhesive force, and the water resistance can be improved.
The UV-curable aqueous polyurethane dispersions are aqueous anionic UV-crosslinkable dispersions based on aliphatic urethane acrylates, having a solids content of 39.0 to 41.0% and a tack of 10 to 500mPas, which are known or can be prepared by known methods, including some preferred products which are commercially available aqueous dispersions, for example under the trade name
(BASF SE germany), in particular the products LAROMER LR 8949, UA 9060, UA 9095, LR 8963, LR9005, UA 9059; for example by means of a trade mark name
Products sold (Bayer Material science AG, Germany), in particular the products BAYHYDROL UV 2280, UV 2282, UV 2317 and UV 2689; for example by means of a trade mark name
(DSM Coating Resins, LLC), in particular the products NEORAD R-441, R-448, UV-14, UV-20 and UV-65; such as that sold under the trade name Alberdingk Boley
Products sold by LUX, in particular the products LUX339, 225, 250 and 260 VP; or by trade mark name
(Allnex), in particular the products UCECOAT7177, 7699/7733/7710/7689 and 7788.
The acrylate emulsion is known in the art, and comprises one or more of pure acrylic emulsion, silicone acrylic emulsion, styrene-acrylic emulsion, vinyl acetate acrylic emulsion, organic silicone modified acrylic emulsion, organic fluorine modified styrene-acrylic emulsion, epoxy resin modified acrylic emulsion, functional monomer modified acrylic emulsion and cationic acrylic emulsion.
The silane coupling agents are well known in the art and include one or more of epoxy silanes, isocyanate group-containing silanes, chelating silanes, fluorine-containing silanes, vinyl silanes, azides, acid anhydride groups, carboxylic acid groups, ester groups, aldehyde groups, hydroxyl groups, multifunctional polymeric silanes, and long chain alkyl silanes.
The coatings of the present invention also contain conventional coating adjuvants, photoinitiators, suitable photoinitiators being capable of initiating polymerization of ethylenically unsaturated double bonds upon exposure to UV radiation. The photoinitiator is one or more of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 1-hydroxy-cyclohexyl-phenyl ketone, 2, 4, 6-trimethylbenzoyl diphenyl phosphine oxide, benzophenone and benzoin dimethyl ether.
The light stabilizer includes dihydroxy benzophenone and its derivatives, benzotriazole and its derivatives, phenoxy triazine and its derivatives, and other types of light stabilizers such as bis (1,2,2,6, 6-pentamethyl-4-piperidine) sebacate, 1-methyl-8- (1,2,2,6, 6-pentamethyl-4-piperidine) sebacate, polymeric light stabilizers such as a polymer of succinic acid and (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidinol), and the like.
The auxiliary agent comprises a leveling agent, a rheological auxiliary agent, a film forming auxiliary agent, a dispersing agent, a defoaming agent and/or a flatting agent or an anti-adhesion agent.
The surfactants, including the specific type of surfactant, can further improve the stain resistance of the finish varnish coating of the present invention. Preferably, the specific type of surfactant is a fluorocarbon surfactant or a silicone surfactant.
In the present invention, the fluorocarbon surfactant includes anionic fluorocarbon surfactant, cationic fluorocarbon surfactant, nonionic fluorocarbon surfactant, amphoteric fluorocarbon surfactant, and other types of fluorocarbon surfactants such as silicon-containing fluorocarbon surfactant, hybrid surfactant, long-chain surfactant, and/or non-hydrophilic fluorocarbon surfactant. For example by means of a trade mark name
(Senyong chemical synthesis) products sold, in particular, the products AZF-2003, 2301, 2105, 2002, to
(Senyong chemical) marketed products, in particular FCS-100,005,4430, for the production of pharmaceuticals
(DuPont), in particular Zonyl FS-3100, FS-O100, FSN-100, etc.
The organic silicon surfactant comprises an anionic organic silicon surfactant, a cationic organic silicon surfactant, an amphoteric organic silicon surfactant and a nonionic organic silicon surfactant.
The preparation method of the finishing varnish comprises the following steps: fully stirring the auxiliary agent in parts by weight with the ultraviolet curing aqueous polyurethane dispersion, the acrylic emulsion, the silane coupling agent, the water and the surfactant in parts by weight, adding the photoinitiator and the light stabilizer in parts by weight, and fully stirring to obtain the ultraviolet curing aqueous polyurethane emulsion
Since the photoinitiator and the light stabilizer are sensitive to light, the photoinitiator and the light stabilizer need to be protected from light for storage, and the light also needs to be protected from light in the production process. In order to avoid accidental exposure to light and thus polymerization, which is caused by the production process being too long, the photoinitiator and the light stabilizer are added last.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the coating process is suitable for the field of the integrated outer wall board with high requirement on coating;
2. the coating process has good adhesion and small color difference;
3. the coating process disclosed by the invention is short in production time, the time from drying to curing is less than 55min, the dehydration and flash drying is carried out for 10-40min, the UV curing is carried out for 10-20 seconds, and the post heat treatment is carried out for 0-15 min;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
Example 1
Mixing 48 parts by weight of ultraviolet curing aqueous polyurethane dispersion, 40 parts by weight of acrylate emulsion, 0.5 part by weight of silane coupling agent, 0.1 part by weight of fluorocarbon surfactant, 20 parts by weight of water and 1.4 parts by weight of auxiliary agent, fully stirring, adding 0.5 part by weight of photoinitiator and 2 parts by weight of light stabilizer, and fully stirring to obtain the finishing varnish.
Examples 2-4 finishing varnishes prepared according to the method of example 1 had the raw material compositions shown in table 1.
Table 1: raw materials and specific parts by weight of each example
Wherein the raw material sources of the ultraviolet curing aqueous polyurethane dispersion, the acrylate emulsion, the auxiliary agent, the silane coupling agent, the fluorocarbon surfactant, the photoinitiator and the light stabilizer in the examples 1 to 4 are shown in table 2.
Table 2: examples 1-4 sources of starting materials
| Coating composition | Company name | Product code |
| Silane coupling agent | Daokangning for curing disease | Z-6040 |
| Fluorocarbon surfactants | "Senyong" chemical synthesis | AZF-2003 |
| Photoinitiator | IGM | Omnirad 500 |
| Ultraviolet light curing aqueous polyurethane dispersion | Basf-Fr | Laromer UV 9095 |
| Acrylic ester emulsion | Basf-Fr | Acronal 7051 |
| Auxiliary agent (defoaming agent) | Bike (Bike) | BYK 093 |
| Auxiliary agent (thickener) | Dow's disease | Acrysol 12W |
| Light stabilizers | Basf-Fr | Tinuvin 1130 |
Example 5
The finishing varnish prepared according to example 1 was subjected to a coating process comprising the following specific steps:
(1) coating a first finishing varnish: uniformly rolling or spraying a layer of finishing varnish on the surface of the substrate;
(2) infrared drying of the first finishing varnish: drying the substrate roller-coated or sprayed with the first finishing varnish in the step (1) for 1min by using infrared rays;
(3) coating a second coat varnish: uniformly roller-coating or spraying a layer of finishing varnish on the surface of the finish varnish dried by infrared drying in the step (2);
(4) and (3) second infrared drying of finishing varnish: drying the substrate roller-coated or sprayed with the finishing varnish in the step (3) for 1min by using infrared rays;
(5) dewatering and flash drying: placing the substrate dried by the finishing varnish in the step (4) in an oven at 75 ℃ for flash drying for 15 min;
(6) UV curing: irradiating the substrate dried in the step (5) with ultraviolet light with the energy of 800mJ/cm2Curing under the condition;
(7) and (3) post heat treatment: and (4) drying the substrate cured in the step (6) in an oven at 70 ℃ for 10 min.
Examples 6-9 are the finishing varnishes obtained in example 1 following the procedure of example 5 with the application of the different parameters of the dehydration drying process, as specified in table 3.
Table 3: examples 6-9 different dehydration drying Process parameters
Examples 10-14 are the finishing varnish prepared in example 1 and applied according to the method of example 5 under different UV-curing irradiation energy process parameters, which are shown in Table 4.
Table 4: examples 10-14 different UV-curing irradiation energy Process parameters
Examples 15-19 are the finishing varnish prepared in example 1 and were applied according to the method of example 5 with the different post-heat treatment process parameters, as shown in table 5.
Table 5: examples 15-19 different post heat treatment Process parameters
Comparative example 1
The comparative example is a coating process of a two-component polyurethane coating on an integrated board.
1. The two-component polyurethane coating comprises the following raw materials:
and B component: 29 parts of water-based isocyanate curing agent
The preparation method comprises the following steps: and fully stirring the water, the hydroxyl acrylate dispersoid, the flatting agent, the defoaming agent and other auxiliaries in parts by weight to obtain the component A. And before construction, adding the B component water-based isocyanate curing agent according to a certain proportion, and fully dispersing uniformly at a high speed.
2. The coating process comprises the following steps:
the comparative example is a coating process adopting a two-component polyurethane coating, and comprises the following specific steps:
(1) coating a first finishing varnish: uniformly rolling or spraying a layer of finishing varnish on the surface of the substrate;
(2) infrared drying of the first finishing varnish: drying the substrate roller-coated or sprayed with the first finishing varnish in the step (1) for 1min by using infrared rays;
(3) coating a second coat varnish: uniformly roller-coating or spraying a layer of finishing varnish on the surface of the finish varnish dried by infrared drying in the step (2);
(4) and (3) second infrared drying of finishing varnish: drying the substrate roller-coated or sprayed with the finishing varnish in the step (3) for 1min by using infrared rays;
(5) curing and drying: placing the substrate dried by the finishing varnish in the step (4) in an oven at 55 ℃ for flash drying for 4 h;
comparative example 2
The comparative example is a coating process of a common water-based UV coating on an integrated board.
1. The water-based UV coating comprises the following raw materials:
the comparative example is a coating process adopting a common water-based UV coating, and comprises the following specific steps:
(1) coating a first finishing varnish: uniformly rolling or spraying a layer of finishing varnish on the surface of the substrate;
(2) infrared drying of the first finishing varnish: drying the substrate roller-coated or sprayed with the first finishing varnish in the step (1) for 1min by using infrared rays;
(3) coating a second coat varnish: uniformly roller-coating or spraying a layer of finishing varnish on the surface of the finish varnish dried by infrared drying in the step (2);
(4) and (3) second infrared drying of finishing varnish: drying the substrate roller-coated or sprayed with the finishing varnish in the step (3) for 1min by using infrared rays;
(5) dewatering and flash drying: and (5) placing the substrate with the finish paint dried in the step (4) in an oven at 50 ℃ for flash drying for 30 min.
(6) And (3) photocuring: placing the substrate after flash drying in the step (5) at the ultraviolet light intensity of 800mJ/cm2Curing under the condition.
Test example 1
In this test example, the specifications of the finish varnish obtained in example 1 after the coating process according to the process parameters of example 5 were compared with the specifications of the coating process of comparative examples 1-2, and the results are shown in Table 6.
Table 6: comparison of the Properties of example 5 with those of comparative examples 1-2
From the above test results, the technical index of example 5 has obvious advantages in the aspect of time consumption of the coating process compared with that of comparative example 1, and the coating prepared by the method has certain improvements in adhesion, hardness and QUV artificial aging resistance. The technical criteria of example 5 compared to comparative example 2, although the production time is not very different, it shows better performance in terms of coating adhesion, hardness and QUV artificial ageing discoloration resistance.
The technical indexes of the finishing varnish prepared in example 1 after the coating process is carried out according to the process parameters of examples 6 to 19 and after curing and film forming are similar to the comparison results of comparative example 1 and comparative example 2 and the comparison results, and the details are not repeated.
Test example 2
The test example examined the effect of different dehydration conditions on the specifications of the cured film-forming finish varnish, and specifically, the finish varnish obtained in example 1 was coated according to the coating method of example 5 under the same coating process parameters as in example 5 except for different dehydration flash conditions, and the results are shown in table 7.
TABLE 7 comparison of technical indexes of film formation by curing of finishing varnish under different dehydration conditions
From the above results, it can be seen that the adhesion, hardness, water and alkali resistance and artificial aging resistance are better when the dehydration flash drying condition is 45-90 deg.C for 10-40min, and the performance is best when the dehydration flash drying condition is 50-80 deg.C for 20-30 min.
Test example 3
The test example investigates the influence of different ultraviolet curing irradiation energy on the technical index of curing and film forming of the finishing varnish. Specifically, the finishing varnish obtained in example 1 was subjected to the same coating process as in example 5 except that the uv curing irradiation energy was different, and the results are shown in table 8.
Table 8: comparison of technical indexes of finish varnish curing film formation under different ultraviolet curing irradiation energies
From the above test results, when the irradiation energy of UV-curing is 600-2The coating has good performances of appearance, adhesive force, hardness, aging resistance and the like, and when the ultraviolet curing irradiation energy is 800-1200mJ/cm2The performance is best.
Example 4
The test example investigates the influence of different post-heat treatment conditions on the technical index of the film formation by the curing of the finishing varnish. Specifically, the finishing varnish obtained in example 1 was subjected to the same coating process as in example 5 except that the post heat treatment conditions were different in the coating process of example 5, and the results are shown in table 9.
Table 9: comparison of technical indexes of finish varnish curing film forming under different post heat treatment conditions
From the test results, the performances of the coating film such as appearance, adhesive force, hardness, aging resistance and the like are better when the post heat treatment condition is 70-100 ℃ for 0-15min, the performances are best when the post heat treatment condition is 70-90 ℃ for 5-10min, and the performances are more stable in the aspects of adhesive force, hardness, double bond conversion rate and the like when the post heat treatment is adopted compared with the performances which are not adopted.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The coating process of the finishing varnish on the integrated board is characterized by comprising drying and curing, wherein the drying comprises dehydration flash drying and later-stage heat treatment, the dehydration flash drying is dehydration drying treatment before curing, and the later-stage heat treatment is heating drying treatment after curing.
2. The process for coating a finishing varnish on an integrated board according to claim 1, wherein the dehydration flash-drying temperature is 45 to 90 ℃ and the dehydration flash-drying time is 10 to 40 min;
preferably, the dehydration flash-drying temperature is 50-80 ℃, and the dehydration flash-drying time is 20-30 min.
3. The process for coating a finishing varnish on an integrated board according to claim 1, wherein the post heat treatment temperature is 70 to 100 ℃ and the post heat treatment time is 0 to 15 min;
preferably, the temperature of the post heat treatment is 70-90 ℃, and the time of the post heat treatment is 5-10 min.
4. The process of claim 1, wherein the curing is ultraviolet curing under ultraviolet irradiation.
5. The process for coating a finishing varnish on an integrated board as claimed in claim 4, wherein the ultraviolet irradiation energy in the ultraviolet curing process is 600 to 1500mJ/cm2。
6. The process for coating a finishing varnish on an integrated board as claimed in claim 5, wherein the ultraviolet irradiation energy in the ultraviolet curing process is 800-1200mJ/cm2。
7. Process for finishing varnish application on one piece board according to any one of claims 1 to 6, characterised in that the coating process comprises the following steps:
(1) coating a first finishing varnish: uniformly rolling or spraying a layer of finishing varnish on the surface of the substrate;
(2) infrared drying of the first finishing varnish: drying the substrate roller-coated or sprayed with the finishing varnish in the step (1) by using infrared rays;
(3) coating a second coat varnish: uniformly roller-coating or spraying a layer of finishing varnish on the surface of the finish varnish dried by infrared drying in the step (2);
(4) and (3) second infrared drying of finishing varnish: drying the substrate roller-coated or sprayed with the finishing varnish in the step (3) by using infrared rays;
(5) dewatering and flash drying: placing the substrate dried by the finishing varnish in the step (4) in a drying box for primary drying treatment;
(6) and (3) photocuring: carrying out UV light curing treatment on the substrate dried in the step (5);
(7) and (3) post heat treatment: and (4) placing the substrate cured in the step (6) in a drying oven for post-heating curing treatment.
8. The process of claim 7, wherein the time required for the finishing process is less than 55 min.
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