CN113022184A - Spray painting process - Google Patents
Spray painting process Download PDFInfo
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- CN113022184A CN113022184A CN202110134209.7A CN202110134209A CN113022184A CN 113022184 A CN113022184 A CN 113022184A CN 202110134209 A CN202110134209 A CN 202110134209A CN 113022184 A CN113022184 A CN 113022184A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0023—Digital printing methods characterised by the inks used
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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
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D11/107—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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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
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The application relates to the field of advertisement inkjet printing, in particular to an inkjet printing process. The spray painting process comprises the following steps: s1, coating a base coating on the spray-painted substrate, and drying to obtain a base-painted substrate; s2, spray-printing the spray-painting ink on the base coating substrate, and drying to finish spray-painting; the base coating in the step S1 is prepared from the following raw materials in parts by weight: adhesive: 10-25 parts; nano-porous titanium dioxide: 20-40 parts of a solvent; auxiliary agent: 1.5-3 parts; water: 15-25 parts. The spray painting process has the effect of improving the color fastness, light fastness and water resistance of the printing ink.
Description
Technical Field
The application relates to the field of advertisement spray painting, in particular to a spray painting process.
Background
The spray painting is a process of printing color advertisement pictures on a substrate in a large format by adopting a digital piezoelectric technology, and has become an important component in the advertisement media industry chain together with the screen printing industry.
The Chinese patent application with the application number of CN202010381097.0 discloses an inkjet printing process, which comprises the following steps: s1: selecting CTP screen special equipment and outputting a high-resolution printing file; s2, selecting a 5-8 color printer, configuring permeable oxidation drying ink, inputting the printed file obtained in the step S1 into the printer, and selecting rice paper as printing paper; s3: printing and spray-painting on rice paper; s4: after the printing is finished, the rice paper naturally permeates and is fully oxidized and dried for 24 hours.
In the related art, the ink is directly jet-printed on the printing substrate; because the light resistance of the ink is general, the phenomena of color change and even color drop are easy to occur in the spray-painted advertisement displayed outdoors.
Content of application
In order to solve the problems that the light resistance of the spray-painted advertisement in the related technology is poor, and the phenomenon of color change or color drop is easy to occur, the application provides a spray-painting process.
The application provides an inkjet printing process, which adopts the following technical scheme:
a spray painting process comprises the following steps:
s1, coating a base coating on the spray-painted substrate, and drying to obtain a base-painted substrate;
s2, spray-printing the spray-painting ink on the base coating substrate, and drying to finish spray-painting;
the base coating in the step S1 is prepared from the following raw materials in parts by weight:
adhesive: 10-25 parts;
nano-porous titanium dioxide: 20-40 parts of a solvent;
auxiliary agent: 1.5-3 parts;
water: 15-25 parts.
According to the spray painting process, the base coating is coated on the printing substrate to form the coating, and then spray painting ink is sprayed and printed on the base coating. The bottom coating contains nano porous titanium dioxide, so that on one hand, the light resistance of the ink can be improved by utilizing the shielding effect of the titanium dioxide on ultraviolet rays, and the destructiveness of the ultraviolet rays on the color fastness of the ink can be reduced; on the other hand, the high porosity is utilized to quickly adsorb and fix the jet printing ink, so that the jet printing ink not only has good light resistance, but also has good water resistance, the color is not easy to fall off, and the color fastness is obviously improved.
Preferably, the nano-porous titanium dioxide is prepared by the following method:
s101, fully dissolving butyl titanate in absolute ethyl alcohol, and dropwise adding a proper amount of deionized water under the stirring condition to prepare titanium dioxide sol;
s102, adding a proper amount of absolute ethyl alcohol into the titanium dioxide sol, then dropwise adding polyethylene glycol, uniformly mixing, aging and airing to obtain dry powder, calcining the dry powder at a high temperature of 430-480 ℃ for 2-3h, cooling, washing with water, washing with alcohol, and drying to obtain the nano porous titanium dioxide.
In the step S102, the polyethylene glycol is mixed with the titanium dioxide sol as a surfactant and dried to form dry powder, and after high-temperature calcination, the polyethylene glycol in the dry powder is burnt out, so that pores are formed in dry powder particles, the specific surface area of the titanium dioxide is increased, the titanium dioxide not only has an ultraviolet-resistant effect, but also has an effect of adsorbing and fixing the inkjet printing ink, and finally, the light resistance and the color fastness of the inkjet printing advertisement are improved.
Preferably, in step S102, the molecular weight of the polyethylene glycol is 700-1000.
The larger the molecular weight of the polyethylene glycol adopted in the technical scheme is, the larger the pore diameter of the calcined particle is, and on the contrary, the smaller the pore diameter is. The diameter is too small, which affects the adsorption and fixation of the ink and further affects the color fastness, and the diameter is too large, which affects the diffusion of the ink.
Preferably, the molar ratio of the butyl titanate to the polyethylene glycol is (3-5): 1.
The use amount of the polyethylene glycol is increased, so that the porosity of the nano porous titanium dioxide is improved, the adsorption and the fixation of the printing ink are facilitated, and the color fastness and the water resistance are improved.
Preferably, the adhesive is polyacrylate emulsion.
Through adopting above-mentioned technical scheme, compare traditional PVA emulsion, acrylic emulsion's water resistance, weatherability, stability are higher, are favorable to improving the waterproof nature of air brushing advertisement.
Preferably, the auxiliary agent is one or more of a water-retaining agent, a leveling agent, a dispersing agent and a defoaming agent.
By adopting the technical scheme, the water-retaining agent has a moisturizing effect, reduces the shrinkage of the priming paint, and meanwhile, retains partial water in the paint layer, thereby being beneficial to the permeation and fixation of the inkjet printing ink.
The leveling agent can enhance the leveling property of the paint, so that the film formed by the paint on a substrate is smoother and more uniform, the surface tension of the bottom coating layer is reduced, and the adsorption and fixation of the spray painting ink are facilitated.
The dispersing agent can reduce and improve the dispersing performance of the coating, particularly promote the dispersion of the nano-porous titanium dioxide and reduce the agglomeration probability of the nano-porous titanium dioxide.
The defoaming agent can eliminate bubbles in the coating, reduce the generation of coating cracks and improve the waterproof performance of the priming coating.
Preferably, the weight part of the water-retaining agent is 1-1.5 parts; the water-retaining agent is one or more of carboxymethyl cellulose, polyvinyl alcohol and sodium polyacrylate.
By adopting the technical scheme, the water-retaining agent has a moisturizing effect, reduces the shrinkage of the priming paint, can retain partial moisture in a paint layer, and is favorable for permeation inside a painting ink phase coating, so that the color fastness of the painting ink is improved.
Preferably, in the step S1, the thickness of the coating of the priming paint is 20-35 μm.
By adopting the technical scheme, part of flowing moisture is left in the base coating layer, the flowing moisture which is closer to the substrate part is less, and the Liu Loose moisture which is closer to the surface of the coating layer is more, so that the concentration difference is generated in the direction of the thickness of the coating layer. If the thickness of the coating film is too thick, the water dysphoria rate is reduced, the coating opening rate phenomenon is caused, and if the thickness of the coating film is too thin, the penetration depth of the printing ink is influenced, and the color fastness is influenced.
Preferably, in step S2, the inkjet ink is prepared from the following raw materials in parts by weight:
alcohol-soluble acrylic resin: 20-30 parts of a solvent;
trifluoroethanol: 15-25 parts;
dye: 20-35 parts.
By adopting the technical scheme, the alcohol-soluble acrylic resin is used as the adhesive of the jet printing ink, so that on one hand, the jet printing ink has better water resistance; on the other hand, the polyacrylate emulsion has better compatibility with polyacrylate emulsion in the base coating layer, so that the base coating layer has better adsorption effect on the jet printing ink.
In summary, the present application has the following beneficial effects:
1. because the primer coating containing the nano-porous titanium dioxide is adopted, the spray printing ink can be fixed in the gaps of the porous titanium dioxide, so that the light resistance and the water resistance of the spray printing advertisement are effectively improved, and the color is not easy to fall off.
2. In the application, polyethylene glycol with the molecular weight of 700-1000 is preferably used as a pore-forming agent, so that the prepared nano porous titanium dioxide has a proper gap diameter, the uvioresistant and waterproof effects of the nano porous titanium dioxide can be fully exerted, and the light resistance and the water resistance of the inkjet advertisement are finally improved.
3. Adopt the cooperation of water-retaining agent and suitable coating thickness in this application for the air brushing ink can permeate to prime coat paint layer thickness direction, has further improved the colour fastness after the air brushing.
4. The base coating and the inkjet printing ink respectively adopt polyacrylate emulsion and alcohol-soluble acrylic resin, so that on one hand, the water resistance of inkjet printing advertisements can be improved; on the other hand, the compatibility of the two is good, which is beneficial to improving the color fastness.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example
Preparation example 1, a nanoporous titanium dioxide was prepared as follows:
s101, fully dissolving butyl titanate in absolute ethyl alcohol, and dropwise adding a proper amount of deionized water under the stirring condition to prepare titanium dioxide sol;
s102, adding a proper amount of absolute ethyl alcohol into the titanium dioxide sol, immersing the titanium dioxide sol, then dropwise adding polyethylene glycol, uniformly mixing, aging and airing to obtain dry powder, calcining the dry powder at the high temperature of 430-480 ℃ for 2-3h, and cooling, washing with water, washing with alcohol and drying to obtain the nano porous titanium dioxide with the D90 being less than or equal to 80 nm.
Wherein the weight ratio of the butyl titanate, the absolute ethyl alcohol and the deionized water in the step S101 is 1:5: 30; the molar ratio of butyl titanate in step S101 to polyethylene glycol in step S102 was 4:1, and the molecular weight of polyethylene glycol was 800.
Preparation example 2, a nanoporous titanium dioxide, was different from preparation example 1 in that the molar ratio of butyl titanate to polyethylene glycol was 2:1 in step S102.
Preparation example 3, a nanoporous titanium dioxide, was different from preparation example 1 in that the molar ratio of butyl titanate to polyethylene glycol was 6:1 in step S102.
Preparation example 4, a nanoporous titanium dioxide, was different from preparation example 1 in that polyethylene glycol has a molecular weight of 600 in step S102.
Preparation example 5, a nanoporous titanium dioxide, was different from preparation example 1 in that polyethylene glycol had a molecular weight of 1200 in step S102.
Examples
Embodiment 1, a spray painting process, comprising the steps of:
s1, coating a primer on paper (spray painting substrate), drying at 80 ℃ to obtain a primer layer with the thickness of 30 mu m, and obtaining a primer substrate;
s2, spray-printing the spray-painting ink on the base coating substrate, and naturally drying at room temperature of 23 ℃ to finish spray-painting;
the base coating in the step S1 is prepared from the following raw materials in parts by weight:
the raw materials and the corresponding contents of the priming paint and the inkjet printing ink are shown in table 1.
Examples 2 to 5, a difference of the inkjet printing process from example 1 is that the raw material selection and the corresponding content of the primer coating or inkjet printing ink are shown in table 1.
Table 1 examples 1 to 5 raw material components and their respective contents (kg) of undercoat paint and inkjet ink
In table 1, the nano-porous titanium dioxide prepared in preparation example 1 was used as the undercoat, and the manufacturer information of each raw material component is shown in table 2.
Table 2 raw material manufacturer information table
| Raw materials | Manufacturer model information |
| Water-retaining agent | Zhengzhou Guangda chemical products Co Ltd sodium polyacrylate |
| Leveling agent | BYK-333, a university and Chuan Fine chemical Co., Ltd, Guangzhou |
| Dispersing agent | BYK-190, a Shanghai Guangbai New Material Co., Ltd |
| Defoaming agent | Shenzhen ocean New Material Co Ltd DC-65 |
| Adhesive agent | Polyacrylate emulsion (acrylic emulsion) of Shanghai Yu building materials Co., Ltd |
Example 6, a spray painting process, differs from example 1 in that the raw material of the base coating adopts the nanoporous titanium dioxide prepared in preparation example 2.
Example 7, a spray painting process, differs from example 1 in that the raw material of the base coating adopts the nanoporous titanium dioxide prepared in preparation example 3.
Example 8, a spray painting process, differs from example 1 in that the raw material of the base coating adopts the nanoporous titanium dioxide prepared in preparation example 4.
Example 9, a spray painting process, differs from example 1 in that the raw material of the base coating adopts the nano-porous titanium dioxide prepared in preparation example 5.
Example 10, a spray painting process, differs from example 1 in that the same amount of polyvinyl alcohol was used in the binder material of the base coat instead of the polyacrylate emulsion.
Example 11, a difference of an inkjet printing process from example 1, is that in the raw materials of the inkjet printing ink, the same amount of polyvinyl alcohol is used instead of alcohol-soluble acrylic resin.
Example 12, a spray painting process, different from example 1, in that in the binder raw material of the base coating, polyvinyl alcohol of the same amount is used to replace polyacrylate emulsion; in the raw materials of the spray-painting ink, the same amount of polyvinyl alcohol is adopted to replace alcohol-soluble acrylic resin.
Example 13, an inkjet printing process, differs from example 1 in that the thickness of the primer coating layer prepared in step S1 is 15 μm.
Example 14, an inkjet printing process, differs from example 1 in that the thickness of the undercoat paint layer prepared in step S1 was 35 μm.
Comparative example
Comparative example 1, a spray painting process, differs from example 1 in that the same amount of nano-silica is used in the raw materials of the base coating instead of nano-porous titanium dioxide.
Comparative example 2, an inkjet printing process, differs from example 1 in that inkjet printing ink was directly inkjet printed on paper (inkjet printed substrate) without performing the operation in step S1.
Comparative example 3, a spray painting process comprising the steps of:
s1: selecting CTP screen special equipment and outputting a high-resolution printing file;
s2, selecting a 6-color printer and preparing permeable oxidation drying ink, wherein the ink is produced by DIC; inputting the printing file obtained in the step S1 into a printing machine, and selecting rice paper as printing paper;
s3: printing spray drawing on the rice paper, wherein the pressure is 1500kg when the rice paper is subjected to inking printing;
s4: after the printing is finished, the rice paper naturally permeates and is fully oxidized and dried for 24 hours.
Performance test
Test 1: color fastness test
Test samples: the inkjet printing products prepared in examples 1 to 15 and comparative examples 1 to 3.
The test method comprises the following steps: referring to a test method in GB/T13217.7-2009 'method for testing liquid ink adhesion fastness', an adhesive tape is adhered to a printing surface of spray-painting ink, the ink tape is rolled and rolled on a tape press for 3 times in a reciprocating manner, the ink tape is placed for 5min, a sample is clamped on the adhesive tape exposed out of a disc A and fixed on a disc B (test equipment is shown in GB/T7707-2008), then the disc A rotates at the speed of 1.0m/s, and the adhesive tape is uncovered.
Covering the uncovered part with a semitransparent millimeter paper with a width of 20mm to count the number of the grids occupied by the ink layer (A)1) And the number of the ink layer to be peeled off (A)2) According to the colour fastness A ═ A1/(A1+A2) The test results were calculated by x 100% and are shown in table 3.
TABLE 3 color fastness test results
And (3) analyzing test results:
(1) by combining examples 1 to 15 and comparative examples 1 to 3 and combining table 3, it can be seen that the color fastness of the inkjet printing ink on the substrate can be effectively improved by preparing the primer coating layer and adopting the primer coating containing the nano-porous titanium dioxide. The reason may be that the priming paint layer has a good ink receiving layer, so that the inkjet printing ink can be adsorbed and fixed in pores of the nano-porous titanium dioxide, and compared with the inkjet printing ink directly attached to the substrate, the color fastness of the inkjet printing ink can be effectively enhanced.
(2) By combining the examples 1 and 4-5 and combining the table 3, it can be seen that the water-retaining agent adopted in the base coating is beneficial to improving the heating color fastness of the inkjet printing ink. The reason for this is probably that the water-retaining agent can retain a small amount of water in the undercoat paint, which is beneficial to the penetration of the ink in the thickness direction of the undercoat paint layer, thereby improving the color fastness.
(3) By combining the examples 1 and 6-9 and combining the table 3, it can be seen that the thickness of the undercoat paint layer is within the range of 20-35 μm, and the color fastness of the inkjet printing ink is good. The reason for this may be that the thickness is too small, the penetration depth of the inkjet ink is small, and the fixing force is low; too large thickness, fast surface moisture evaporation and slow internal moisture evaporation, thereby generating cracks and being not beneficial to improving color fastness. Under the condition of proper thickness, due to different water evaporation rates, concentration difference exists between the inside and the outside of the bottom coating layer, the more the water content is close to the substrate, the penetration of the ink to the substrate direction is promoted, and the color fastness is further improved.
Test 2: water resistance test
Test samples: the inkjet printing products prepared in examples 1 to 15 and comparative examples 1 to 3.
The test method comprises the following steps: when the jet printing is carried out in the step S2, two groups of jet printing ink with different dye colors are adopted for the jet printing, and two groups of color blocks with linear boundaries are formed on the bottom coating layer. After the printing ink is dried, a drop of deionized water is dripped on the straight line boundary of the two color blocks of the coating layer by adopting a dropper at the height of 1 cm, the deionized water forms a water drop similar to a circle on the printing ink, and the maximum diameter of the water drop is set as d1. In the water drop drying process, the circular water drops are diffused outwards, a region with fuzzy color is formed on the surface of the coating after the water drops are dried, and the width of the widest part of the fuzzy region is set as d2，d2/d1The smaller the ratio of (A) is, the better the waterproof property of the surface is, and the test results are shown in Table 4.
Test 3: light resistance test
Test samples: the inkjet printing products prepared in examples 1 to 15 and comparative examples 1 to 3.
The test method comprises the following steps: with reference to GB/T22771-2008 "evaluation of light resistance of printed matter and printing ink by using a xenon arc lamp for filtering" in the printing technology ", samples were placed in a well-ventilated indoor environment, a test was performed by using a xenon arc lamp with a color temperature of 6000K at a test temperature of 40 + -3 ℃, and the light resistance rating (1-8, 5 and below by N) of each sample was measured, and the test results are shown in Table 4.
TABLE 4 Water and light fastness test results
And (3) analyzing test results:
(1) by combining examples 1 to 15 and comparative examples 1 to 3 and combining table 3, it can be seen that the water resistance and the light resistance of the inkjet printing ink can be effectively improved by preparing the undercoat paint layer and adopting the undercoat paint containing the nanoporous titanium dioxide. The reason for this may be that the inkjet ink is adsorbed and fixed in the pores of the nanoporous titanium dioxide, and thus, after dripping, the ink is difficult to diffuse around, so that the water resistance thereof is improved. Meanwhile, because the titanium dioxide has an anti-ultraviolet effect and is matched with a porous structure, the light resistance of the composite material is obviously improved.
(2) By combining the examples 1 and 6-9 and combining the table 3, it can be seen that the light resistance of the inkjet printing ink can be effectively improved by adopting the polyethylene glycol with the molecular weight of 700-1000 under the condition that the molar ratio of the butyl titanate to the polyethylene glycol is (3-5): 1. The original possibility is that the size of the pore diameter is determined by the molecular weight of polyethylene glycol, and the dosage of polyethylene glycol influences the number of the pore diameters, further influences the specific surface area of the nano-porous titanium dioxide and finally influences the light resistance.
(3) By combining the example 1 and the examples 10 to 12 and combining the table 3, it can be seen that the polyacrylate emulsion is adopted as the base coating, and the alcohol-soluble acrylic resin is adopted as the inkjet printing ink, and the combination of the two is favorable for improving the water resistance of the inkjet printing ink. The reason for this is probably that the polyacrylate emulsion has a crosslinked structure, and the coating film thereof is dense and can effectively suppress the diffusion of moisture. The ink has high compatibility with alcohol-soluble acrylic resin in the inkjet printing ink and good adhesive property, and is beneficial to improving the color fastness of the ink.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A spray painting process is characterized by comprising the following steps:
s1, coating a base coating on the spray-painted substrate, and drying to obtain a base-painted substrate;
s2, spray-printing the spray-painting ink on the base coating substrate, and drying to finish spray-painting;
the base coating in the step S1 is prepared from the following raw materials in parts by weight:
adhesive: 10-25 parts;
nano-porous titanium dioxide: 20-40 parts of a solvent;
auxiliary agent: 1.5-3 parts;
water: 15-25 parts.
2. The inkjet printing process according to claim 1, wherein: the nano-porous titanium dioxide is prepared by the following method:
s101, fully dissolving butyl titanate in absolute ethyl alcohol, and dropwise adding a proper amount of deionized water under the stirring condition to prepare titanium dioxide sol;
s102, adding a proper amount of absolute ethyl alcohol into the titanium dioxide sol, then dropwise adding polyethylene glycol, uniformly mixing, aging and airing to obtain dry powder, calcining the dry powder at a high temperature of 430-480 ℃ for 2-3h, cooling, washing with water, washing with alcohol, and drying to obtain the nano porous titanium dioxide.
3. The inkjet printing process according to claim 2, wherein: in the step S102, the molecular weight of the polyethylene glycol is 700-1000.
4. The inkjet printing process according to claim 3, wherein: the molar ratio of the butyl titanate to the polyethylene glycol is (3-5) to 1.
5. The inkjet printing process according to claim 1, wherein: the adhesive adopts polyacrylate emulsion.
6. The inkjet printing process according to claim 1, wherein: the auxiliary agent is one or more of a water-retaining agent, a flatting agent, a dispersing agent and a defoaming agent.
7. The inkjet printing process according to claim 6, wherein: the weight part of the water-retaining agent is 1-1.5 parts; the water-retaining agent is one or more of carboxymethyl cellulose, polyvinyl alcohol and sodium polyacrylate.
8. The inkjet printing process according to claim 1, wherein: in step S1, the thickness of the coating of the priming paint is 20-35 μm.
9. The inkjet printing process according to claim 1, wherein: in step S2, the inkjet printing ink is prepared from the following raw materials in parts by weight:
alcohol-soluble acrylic resin: 20-30 parts of a solvent;
trifluoroethanol: 15-25 parts;
dye: 20-35 parts.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116004053A (en) * | 2023-02-10 | 2023-04-25 | 宁夏森源印务有限公司 | Water-based ink printing and packaging process |
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