Preparation method of black film and black film
A water-soluble black film was prepared by coating carbon black particles with polyethylene glycol, combined with a specific polymer and ultraviolet light irradiation. This method solves the problems of using organic solvents and poor film-forming properties in the existing black film preparation process, and achieves direct contact with the printing plate and a simplified preparation process, thereby improving the uniformity and light-blocking effect of the black film.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-01-04
- Publication Date
- 2026-03-27
AI Technical Summary
Existing black film preparation processes suffer from problems such as the use of organic solvents, insolubility in water, poor film-forming properties, or inability to directly contact the plate material. As a result, the photosensitive resin plate is affected by the environment during the plate-making process and cannot accurately reproduce text and patterns.
Carbon black particles are treated by atomizing polyethylene glycol aqueous solution to form carbon black particles coated with polyethylene glycol. These particles are then mixed with polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate under yellow light, and defoamer is added. The mixture is then coated onto a carrier film and irradiated with ultraviolet light to form a black film, which is finally removed by washing with water.
The prepared black film has good water solubility, can directly contact the printing plate, simplify the preparation process, avoid corrosion by organic reagents, improve the ease of removal, and can be rapidly formed by heating and ultraviolet light to ensure the uniformity and light-blocking effect of the black film.
Smart Images
Figure CN121736334A_ABST
Abstract
Description
[0001] This application is a divisional application of the China Patent Application No. 202310006441.1, filed on January 4, 2023, entitled "Preparation Method of Black Film and Black Film", the whole content of which is incorporated herein by reference. TECHNICAL FIELD
[0002] The present application relates to the technical field of printing and copying, in particular to a preparation method of black film and black film. BACKGROUND
[0003] At present, the resin layer of the photosensitive resin plate is easily affected by external conditions such as light and dust in the environment before plate making, causing defects, and thus the text and patterns cannot be truly restored. Therefore, a layer of black film is covered on the resin layer of the photosensitive resin plate for protection. During plate making, according to the text and patterns to be expressed, the black film is removed by laser ablation to expose the resin layer (the resin material used is not water-soluble after light curing and cross-linking polymerization, but is water-soluble without light curing), the entire plate material is exposed to ultraviolet light, the photosensitive resin that is not blocked by the black film is cured, the plate material after exposure is washed with water, the black film and the resin that are not removed are dissolved, a pattern with protrusions is formed, and after auxiliary treatment, a plate material that can be printed on a machine is obtained. However, the preparation of the black film in the prior art has the following problems: organic solvents are used in the preparation process of the black film raw material, or the prepared black film is not soluble in water and needs to be dissolved and removed using organic solvents, or the film-forming property is poor, or the black film cannot be directly contacted with the plate material.
[0004] Therefore, how to prepare a black film that can be directly contacted with the plate material, has a simple preparation method of dissolving in water, and does not need organic solvents has become a problem to be solved at present. SUMMARY
[0005] The present application aims to at least solve one of the problems in the prior art or related art.
[0006] To this end, a first aspect of the present application provides a preparation method of black film.
[0007] A second aspect of the present application provides a black film.
[0008] In view of the above, the first aspect of the present application provides a preparation method of a black film, comprising: preparing a polyethylene glycol aqueous solution by mixing polyethylene glycol and deionized water, performing atomization treatment on the polyethylene glycol aqueous solution to form a polyethylene glycol water mist; making the pretreated carbon black particles fully contact with the polyethylene glycol water mist to generate carbon black particles coated with polyethylene glycol; freeze-drying the carbon black particles coated with polyethylene glycol; dissolving polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate in deionized water to form a mixed solution under yellow light, adding the freeze-dried carbon black particles to the mixed solution and stirring; adding a polyether defoaming agent without silicon to the mixed solution to generate a stock solution, performing grinding treatment on the stock solution, covering the grinding-treated stock solution on a carrier film to form a coating layer, and drying the carrier film with the coating layer; irradiating the dried carrier film with the coating layer with an ultraviolet lamp; and separating the coating layer from the carrier film after the ultraviolet lamp irradiation to obtain a prepared black film.
[0009] The preparation method of the black film provided by the application comprises the following steps: preparing a polyethylene glycol aqueous solution by mixing polyethylene glycol and deionized water; performing atomization treatment on the polyethylene glycol aqueous solution to form a polyethylene glycol water mist; making the pretreated carbon black particles fully contact with the polyethylene glycol water mist to generate carbon black particles coated with polyethylene glycol; freeze-drying the carbon black particles coated with polyethylene glycol; dissolving polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate in deionized water to form a mixed solution in a yellow light environment; adding the freeze-dried carbon black particles into the mixed solution and fully stirring; adding a polyether defoaming agent without silicon into the mixed solution to generate a stock solution by stirring; performing grinding treatment on the stock solution; covering the grinding-treated stock solution on the surface of a carrier film to form a coating layer; drying the carrier film with the coating layer; irradiating the dried carrier film with the coating layer with an ultraviolet lamp; and separating the coating layer from the carrier film after the ultraviolet lamp irradiation to obtain a prepared black film. By the scheme in the application, the carbon black particles coated with polyethylene glycol are placed in the mixed solution formed by dissolving polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate in deionized water, and stirring and grinding treatment are performed, so that the carbon black can be uniformly distributed in the whole stock solution, and the uniformity of the blackness of the stock solution is ensured. At the same time, polyethylene glycol, polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate are all water-soluble materials, so that the prepared black film can be directly removed by water washing after solidification, which can effectively prevent the corrosion of organic reagents on the photosensitive water-soluble resin and improve the convenience of black film removal. Since ultraviolet rays can be basically eliminated in a yellow light environment, and the ultraviolet rays can cause the solidification of organic reagents, the use of a yellow light environment can effectively avoid the solidification of organic reagents. The addition of a polyether defoaming agent without silicon in the mixed solution can prevent bubbles from being generated in the coating process to affect the quality. The stock solution is covered on the surface of the carrier film to form a coating layer, and the carrier film with the coating layer is dried and irradiated with an ultraviolet lamp, so that the water in the stock solution is evaporated, the organic matter and the carbon black particles in the stock solution are solidified, and the black film is formed on the carrier film. The heating and ultraviolet light irradiation can accelerate the film forming speed.
[0010] The preparation method of the black film in the application has a simple preparation process, and the prepared black film can be directly contacted with the plate material. Only the organic reagents are mixed in a fixed proportion, and the carbon black particles are finely ground. At the same time, the organic reagents used all have good water solubility, and water is used as the solvent in the whole process. Even after the black film is solidified, it still has good water solubility and can be removed together with the un-photosensitive water-soluble resin by water washing in the subsequent cleaning.
[0011] The preparation method of the black film provided by the application can further have the following additional technical features:
[0012] In some possible design, the polyacrylate includes: poly(methyl acrylate), poly(ethyl acrylate), poly(propyl acrylate). The polyacrylate with carbon atom weight less than 3 has good solubility, which reduces the repulsion between materials.
[0013] In some possible design, the mass ratio of the polyethylene glycol diacrylate and the methoxyl polyethylene glycol acrylate is greater than or equal to 200:3 and less than or equal to 200:1, the mass ratio of the polyethylene glycol diacrylate and the polyacrylate is greater than or equal to 5:2 and less than or equal to 5:1, the relative molecular mass of the polyethylene glycol diacrylate is greater than or equal to 4000 and less than or equal to 10000, the relative molecular mass of the polyacrylate is greater than or equal to 500 and less than or equal to 2000, and the relative molecular mass of the methoxyl polyethylene glycol acrylate is greater than or equal to 300 and less than or equal to 3000.
[0014] In this design, the polyethylene glycol diacrylate has water solubility and remains soluble after photopolymerization, which plays a role of film forming and adhesive with high strength. The polyacrylate has poor strength but good adhesion and elasticity, which plays a role of auxiliary film forming and improves the quality of the film layer. The methoxyl polyethylene glycol acrylate is soluble in water and is used for ultraviolet light-induced polymerization. The entire material system is mainly composed of acrylate, which simplifies the material system and reduces the repulsion between materials. The polyethylene glycol diacrylate is the main body of film forming, and thus the appropriate relative molecular mass determines the flatness of the black film after forming. The polyacrylate is an auxiliary film forming adhesive, and thus the appropriate proportion and smaller relative molecular mass ensure the adhesion and elasticity reinforcement. The methoxyl polyethylene glycol acrylate plays a role in initiating polymerization, and thus the appropriate proportion and relative molecular mass ensure complete effect on the entire film, so that the black film has good forming effect. The proportion of the polyacrylate is adjusted based on the viscosity of the black film, and the proportion of the methoxyl polyethylene glycol acrylate is adjusted according to the ultraviolet polymerization. Specifically, 100 g of polyethylene glycol diacrylate 5000, 20 g of poly(methyl acrylate) 1000 and 1.5 g of methoxyl polyethylene glycol acrylate 2000 are stirred and dissolved in 500 ml of deionized water to form a mixed solution.
[0015] In some possible design, the relative molecular mass of the polyethylene glycol is greater than or equal to 1000 and less than or equal to 3000, and the concentration of the polyethylene glycol aqueous solution is greater than or equal to 40% and less than or equal to 60%.
[0016] In the design, the relative molecular weight of the polyethylene glycol is between 1000 and 3000, and the concentration of the polyethylene glycol aqueous solution is between 40% and 60%. The molecular weight of the polyethylene glycol directly determines the size of the polyethylene glycol. If the relative molecular weight is too large, the polyethylene glycol cannot completely wrap around the carbon black particles. If the relative molecular weight is too small, the polyethylene glycol cannot wrap around the carbon black particles or the thickness of the wrapping film formed by the polyethylene glycol is too low, which cannot form an effective wrapping. The concentration of the polyethylene glycol aqueous solution is set to be between 40% and 60%, so that the polyethylene glycol can be uniformly distributed in the water mist during the subsequent formation of the water mist, thereby ensuring that the polyethylene glycol can effectively wrap around the carbon black particles. Specifically, the relative molecular weight of the polyethylene glycol is 1500, and the concentration of the polyethylene glycol aqueous solution is 50%.
[0017] In some possible designs, when the methoxy polyethylene glycol acrylate is dissolved in deionized water, the temperature of the deionized water is greater than or equal to 20°C and less than or equal to 40°C.
[0018] In the design, methoxy polyethylene glycol acrylate is used to initiate polymerization, so the appropriate temperature will determine the polymerization effect. Too high or too low temperature will result in poor final polymerization effect and the black film is not easy to form. When the methoxy polyethylene glycol acrylate is dissolved in deionized water, the temperature of the deionized water is 20°C to 40°C, which ensures the polymerization effect and makes the black film imaging more uniform.
[0019] In some possible designs, the particle size of the pretreated carbon black particles is greater than or equal to 30 nm and less than or equal to 100 nm; and / or the particle size of the ground carbon black particles is greater than or equal to 30 nm and less than or equal to 70 nm.
[0020] In the design, the carbon black particles need to be pretreated by fine grinding, so that the pretreated carbon black particles can be uniformly distributed in the whole stock and the formed black film, thereby ensuring the uniformity and light shielding property of the black film. Specifically, the particle size of the pretreated carbon black particles is 60 nm, and the particle size of the ground carbon black particles is 60 nm.
[0021] In some possible designs, the stock is coated on the surface of the carrier film to form a coating layer with a thickness greater than or equal to 2 μm and less than or equal to 8 μm.
[0022] In the design, the thickness of the coating layer determines the thickness of the black film, and the black film needs good light shielding property, so the thickness of the coating layer is set to be between 2 μm and 8 μm. Too thick will cause waste, and too thin will not have good light shielding effect. Specifically, the thickness of the coating layer is 3 μm.
[0023] In some possible designs, the carrier film includes a PEEK (Polyether Ether Ketone) film, and further, the carrier film is a PEEK film.
[0024] In this design, the carrier film is a PEEK film. The PEEK film has excellent properties such as high temperature resistance and self-lubricating property, and the prepared black film has a small shrinkage after peeling.
[0025] In some possible designs, when the carrier film with the coating is dried, the drying temperature is greater than or equal to 70 DEG C and less than or equal to 90 DEG C, and the drying time is greater than or equal to 0.5 hours and less than or equal to 1.5 hours.
[0026] In this design, by limiting the temperature and time of drying, the black film can be effectively dehydrated, and at the same time, it is ensured that the black film will not shrink too small, which affects the matching of the black film. Specifically, the drying temperature is 80 DEG C and the drying time is 1 hour.
[0027] In some possible designs, the shrinkage of the black film before and after peeling is greater than or equal to 0.5% and less than or equal to 1%.
[0028] In this design, the shrinkage of the black film before and after peeling is between 0.5% and 1%. The size of the black film and the coating is basically the same, so that the size of the coating does not need to be calculated when the black film is prepared. The production cost is reduced.
[0029] In some possible designs, the mass ratio of the silicon-free polyether defoaming agent to the polyethylene glycol diacrylate is greater than or equal to 1 / 300 and less than or equal to 1 / 200; the silicon-free polyether defoaming agent includes a fatty alcohol defoaming agent.
[0030] In this design, the silicon-free polyether defoaming agent includes a fatty alcohol defoaming agent. During the process of covering the original slurry on the carrier film, the film layer may be blistered, which affects the quality. The addition of the fatty alcohol defoaming agent can avoid the blistering of the film layer, thereby improving the uniformity of the black film.
[0031] In some possible designs, when the carrier film with the coating after drying is irradiated by a UV lamp, the irradiation time of the UV lamp is greater than or equal to 3 minutes and less than or equal to 15 minutes.
[0032] In this design, by limiting the irradiation time of the ultraviolet light, the forming effect of the black film is ensured, so that the structure in the black film is fixed. And the limitation, and less than or equal to 15 minutes ensures that the black film will not shrink too much, thereby ensuring the matching degree of the black film.
[0033] The second aspect of the present application provides a black film, which is prepared by the method for preparing a black film according to any one of the first aspect of the present application, and thus has all the beneficial effects of the method for preparing a black film according to any one of the first aspect of the present application, which will not be repeated here.
[0034] The black film provided by the present application has a black-white density value D greater than or equal to 0 and less than or equal to 0.06. The black-white density of the black film determines the light shielding rate. The black film formed in the present application has a black-white density value D between 0 and 0.06, which ensures that the generated black film has good light shielding effect.
[0035] Additional aspects and advantages of the present application will become apparent in the description that follows, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0036] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, including the accompanying drawings, in which:
[0037] Figure 1 A schematic diagram of a method for preparing a black film according to an embodiment of the present application is shown;
[0038] Figure 2 A schematic diagram of a method for preparing a black film according to another embodiment of the present application is shown. DETAILED DESCRIPTION
[0039] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0040] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and therefore the scope of protection of the present application is not limited by the specific embodiments disclosed below.
[0041] Reference will now be made to the following description Figure 1 to describe a method for preparing a black film according to some embodiments of the present application.
[0042] Embodiment one:
[0043] According to an embodiment of the present application, the present application provides a method for preparing a black film, comprising:
[0044] As shown in Figure 1 , the method for preparing a black film provided by the present application comprises:
[0045] S101: preparing a polyethylene glycol aqueous solution with polyethylene glycol and deionized water.
[0046] S102: forming an atomization treatment to the polyethylene glycol aqueous solution to form a polyethylene glycol water mist.
[0047] S103: contacting the pre-processed carbon black particles with the polyethylene glycol water mist to generate polyethylene glycol-coated carbon black particles.
[0048] S104: freeze-drying the polyethylene glycol-coated carbon black particles.
[0049] S105: dissolving polyethylene glycol diacrylate, polyacrylate, and methoxy polyethylene glycol acrylate in deionized water to form a mixed solution under yellow light.
[0050] S106: adding the freeze-dried carbon black particles to the mixed solution and stirring.
[0051] S107: adding a polyether defoaming agent without silicon to the mixed solution and stirring to generate a stock solution.
[0052] S108: performing a grinding treatment to the stock solution.
[0053] S109: covering the surface of the carrier film with the ground stock solution to form a coating layer.
[0054] S110: drying the carrier film with the coating layer, irradiating the dried carrier film with the coating layer with an ultraviolet lamp, and separating the coating layer from the carrier film after the ultraviolet lamp irradiation to obtain a prepared black film.
[0055] The black film manufactured by the scheme in the application is prepared by placing the carbon black particles wrapped by polyethylene glycol in a mixed solution formed by dissolving polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate in deionized water, and then performing stirring and grinding treatment. The carbon black can be uniformly distributed in the whole slurry, so as to ensure the uniformity of the slurry blackness. Meanwhile, polyethylene glycol, polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate are all water-soluble materials, so that the black film formed can be directly removed by water washing after solidification, which can effectively prevent the corrosion of organic reagents on the photosensitive water-soluble resin, and meanwhile improve the convenience of black film removal. Since ultraviolet rays can be basically eliminated in the yellow light environment, and the ultraviolet rays can cause the solidification of the organic reagent, the use of the yellow light environment can effectively avoid the solidification of the organic reagent. The polyether defoaming agent without silicon is added to the mixed solution, so as to prevent the film layer from being affected by bubbles during the coating process. The original liquid is covered on the surface of the carrier film to form a coating layer, and the carrier film with the coating layer is dried, and the carrier film with the coating layer after drying is irradiated by an ultraviolet lamp, so that the water in the original liquid is evaporated, the organic matter and the carbon black particles in the original liquid are solidified, and the black film is formed on the carrier film. The heating and ultraviolet light irradiation are used to accelerate the film forming speed.
[0056] Example two:
[0057] The application provides a black film preparation method, as shown in the accompanying drawings, which comprises the following steps: Figure 2
[0058] S201: polyethylene glycol and deionized water are used to prepare a polyethylene glycol aqueous solution, wherein the relative molecular mass of the polyethylene glycol is between 1000 and 3000, and the concentration of the polyethylene glycol aqueous solution is between 40% and 60%;
[0059] S202: the polyethylene glycol aqueous solution is subjected to atomization treatment to form a polyethylene glycol water mist;
[0060] S203: the pretreated carbon black particles are fully contacted with the polyethylene glycol water mist to generate carbon black particles wrapped by polyethylene glycol;
[0061] S204: the carbon black particles wrapped by polyethylene glycol are freeze-dried;
[0062] S205: Dissolve polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate in deionized water to form a mixed solution under yellow light, wherein the mass ratio of polyethylene glycol diacrylate to methoxy polyethylene glycol acrylate is between 200:3 and 200:1, the mass ratio of polyethylene glycol diacrylate to polyacrylate is between 5:2 and 5:1, the relative molecular mass of polyethylene glycol diacrylate is between 4000 and 10000, the relative molecular mass of polyacrylate is between 500 and 2000, and the relative molecular mass of methoxy polyethylene glycol acrylate is between 300 and 3000;
[0063] S206: Add freeze-dried carbon black particles to the mixed solution and stir thoroughly;
[0064] S207: Add a polyether defoamer without silicon to the mixed solution and stir to form a stock solution, wherein the mass ratio of the polyether defoamer without silicon to polyethylene glycol diacrylate is between 1 / 200 and 1 / 300;
[0065] S208: Grind the stock solution for 2 hours, and the particle size of the carbon black particles after grinding is between 30 nm and 70 nm;
[0066] S209: Apply the ground stock solution to the surface of a carrier film to form a coating layer,
[0067] S210: Dry the carrier film with the coating layer at a temperature ranging from 70°C to 90°C for a time period between 0.5 hours and 1.5 hours, and then irradiate the dried carrier film with a UV lamp for a time period between 3 minutes and 15 minutes. After the UV irradiation, separate the coating layer from the carrier film to obtain a prepared black film.
[0068] The preparation method of the black film in the present application is simple, and the black film can be directly contacted with the plate material. Only the organic reagents are mixed in a fixed proportion, and the carbon black particles are finely ground. The organic reagents used in the present application all have good water solubility, and water is used as the solvent throughout the process. Even after the black film is cured, it still has good water solubility and can be washed away with the unexposed water-soluble resin during subsequent cleaning.
[0069] In some possible designs, the relative molecular mass of the polyethylene glycol is between 1000 and 3000, and the concentration of the polyethylene glycol aqueous solution is between 40% and 60%.
[0070] In this embodiment, the relative molecular weight of the polyethylene glycol is between 1000 and 3000, and the concentration of the polyethylene glycol aqueous solution is between 40% and 60%. The molecular weight of the polyethylene glycol directly determines the size of the polyethylene glycol. If the relative molecular weight is too large, the polyethylene glycol cannot completely wrap around the carbon black particles. If the relative molecular weight is too small, the polyethylene glycol cannot wrap around the carbon black particles or the thickness of the wrapping film formed by the polyethylene glycol is too low, which cannot form an effective wrapping. The concentration of the polyethylene glycol aqueous solution is set to be between 40% and 60% so that the polyethylene glycol can be uniformly distributed in the water mist during the subsequent formation of the water mist, thereby ensuring that the polyethylene glycol can effectively wrap around the carbon black particles. Specifically, the relative molecular weight of the polyethylene glycol is selected to be 1500, and the concentration of the polyethylene glycol aqueous solution is 50%.
[0071] In some possible designs, the mass ratio of the polyethylene glycol diacrylate to the methoxyl polyethylene glycol acrylate is between 200:3 and 200:1, the mass ratio of the polyethylene glycol diacrylate to the polyacrylate is between 5:2 and 5:1, the relative molecular weight of the polyethylene glycol diacrylate is between 4000 and 10000, the relative molecular weight of the polyacrylate is between 500 and 2000, and the relative molecular weight of the methoxyl polyethylene glycol acrylate is between 300 and 3000.
[0072] In this embodiment, the polyethylene glycol diacrylate is water-soluble and still has solubility after photopolymerization, and plays a role of film-forming and adhesive with high strength. The polyacrylate has good adhesion and elasticity, plays a role of auxiliary film-forming, and improves the quality of the film layer, although the strength is poor. The methoxyl polyethylene glycol acrylate is soluble in water and is used for ultraviolet light-induced polymerization. The entire material system is mainly based on acrylate, which simplifies the material system and reduces the "rejection" between materials. The polyethylene glycol diacrylate is the main body of film-forming, and therefore a suitable relative molecular weight will determine the flatness of the black film after forming. The polyacrylate is an auxiliary film-forming adhesive, and therefore a suitable proportion and a smaller relative molecular weight are needed to ensure the adhesion and elasticity reinforcement. The role of the methoxyl polyethylene glycol acrylate is to initiate polymerization, and therefore a suitable proportion and a suitable relative molecular weight are needed to ensure complete action on the entire film, so that the black film has good forming effect. The proportion of the polyacrylate is adjusted based on the viscosity of the black film, and the proportion of the methoxyl polyethylene glycol acrylate is adjusted according to the ultraviolet polymerization. Specifically, 100 g of polyethylene glycol diacrylate 5000, 20 g of polyacrylate 1000, and 1.5 g of methoxyl polyethylene glycol acrylate 2000 are stirred and dissolved in 500 ml of deionized water to form a mixed solution.
[0073] In some possible designs, the original slurry is ground for 2 hours, and the particle size of the carbon black particles after the grinding treatment is between 30 nm and 70 nm.
[0074] In this embodiment, the original slurry needs to be ground for 2 hours, so that the particle size of the carbon black particles after grinding is between 30 nm and 70 nm, thereby ensuring that the carbon black particles have good distribution in the black film and ensuring the uniformity of the black film. Specifically, the particle size of the carbon black particles after grinding is 60 nm.
[0075] In some possible designs, the coated carrier film is dried, the drying temperature ranges from 70°C to 90°C, and the drying time is between 0.5 hours and 1.5 hours; the coated carrier film after drying is irradiated by a UV lamp, and the irradiation time of the UV lamp is between 3 minutes and 15 minutes.
[0076] In this technology, the coated carrier film needs to be dried, and in order to ensure the drying effect, the water evaporation drying temperature ranges from 70°C to 90°C, and the drying time is between 0.5 hours and 1.5 hours. After dehydration, the coating needs to be irradiated by ultraviolet light, so that the organic reagent is polymerized to form a black film, and the irradiation time of the ultraviolet lamp is between 3 minutes and 15 minutes. The irradiation time depends on the irradiation efficiency of the ultraviolet light, and too long irradiation time will cause the shrinkage rate of the black film to be large, affecting the production efficiency.
[0077] In some possible designs, the polyacrylate includes an alkyl group, and the number of carbon atoms of the alkyl group is not more than 3.
[0078] In this embodiment, the polyacrylate includes poly(methyl acrylate), poly(ethyl acrylate), and poly(propyl acrylate). That is, the number of carbon atoms of the alkyl group of the polyacrylate is not more than 3. Since the polyacrylate needs to have good adhesion and elasticity, but the strength is poor. Therefore, the number of carbon atoms of the alkyl group is not more than 3, so as to ensure the adhesion and elasticity.
[0079] In some possible designs, when the methoxy polyethylene glycol acrylate is dissolved in deionized water, the temperature of the deionized water is 20°C to 40°C.
[0080] In this embodiment, the methoxy polyethylene glycol acrylate is used to initiate polymerization, so the appropriate temperature will determine the polymerization effect. Too high or too low temperature will result in poor final polymerization effect, and the black film is not easy to form. When the methoxy polyethylene glycol acrylate is dissolved in deionized water, the temperature of the deionized water is 20°C to 40°C, which ensures the polymerization effect and makes the black film imaging more uniform.
[0081] In some possible designs, the particle size of the pretreated carbon black particles is between 30 nm and 100 nm.
[0082] In this embodiment, the carbon black particles need to be pretreated by fine grinding, so that the pretreated carbon black particles can be uniformly distributed in the whole stock and the formed black film, thereby ensuring the uniformity and light shielding property of the black film. Specifically, the particle size of the pretreated carbon black particles is 60 nm.
[0083] In some possible designs, the stock is coated on the surface of the supporting film to form a coating layer with a thickness of 2-8 μm.
[0084] In this embodiment, the thickness of the coating layer determines the thickness of the black film, and the black film needs to have good light shielding property, so the thickness of the coating layer is set to be 2-8 μm, too thick will cause waste, and too thin will not have good light shielding effect. Specifically, the thickness of the coating layer is 3 μm.
[0085] In some possible designs, the supporting film is a PEEK film.
[0086] In this embodiment, the supporting film is a PEEK film. The PEEK film has excellent properties such as high temperature resistance and self-lubricating property, and the prepared black film has small shrinkage after peeling.
[0087] In some possible designs, the shrinkage of the black film before and after separation is 0.5-1%.
[0088] In this embodiment, the shrinkage of the black film before and after separation is 0.5-1%. The size of the black film and the coating layer is basically the same, thereby ensuring that the size of the coating layer does not need to be calculated when the black film is prepared. The production cost is reduced.
[0089] In some possible designs, the silicon-free polyether defoaming agent includes a fatty alcohol defoaming agent.
[0090] In this embodiment, the silicon-free polyether defoaming agent includes a fatty alcohol defoaming agent. During the process of covering the stock on the supporting film, the film layer may be blistered to affect the quality, and the addition of the fatty alcohol defoaming agent can avoid the blistering of the film layer, thereby improving the uniformity of the black film.
[0091] The second aspect of the present application provides a black film, which is prepared by the method for preparing a black film provided in any one of the embodiments of the first aspect of the present application. Therefore, the black film provided in the present application has all the beneficial effects of the method for preparing a black film provided in any one of the embodiments of the first aspect of the present application, which will not be described herein.
[0092] The value of the black and white density D of the black film provided in the present application is between 0 and 0.06. The black and white density of the black film determines the light shielding rate, and the value of the black and white density D of the black film formed in the present application is between 0 and 0.06, thereby ensuring that the generated black film has good light shielding effect.
[0093] In the present application, the term "a plurality of" refers to two or more, unless otherwise expressly specified. The terms "mounting", "connected", "connecting", "fixed", and the like are used broadly and encompass both direct and indirect mounting, connecting, and / or fixing, as appropriate for an application. Further, the terms "connected" and "coupled" are used broadly and encompass both direct and indirect connections, as appropriate for an application.
[0094] In the description of the present application, the terms "one embodiment", "some embodiments", "certain embodiments", etc. do not necessarily refer to the same embodiment or example, but different embodiments or examples can be combined with each other. Moreover, the description of a particular feature, structure, material, or characteristic in connection with an embodiment or example does not imply that the feature is an essential feature, structure, material, or characteristic to all embodiments or examples. Furthermore, the description of a particular feature, structure, material, or characteristic in connection with an embodiment or example does not imply that such feature is an essential feature, structure, material, or characteristic to all embodiments or examples.
[0095] The preferred embodiments of the present application have been described above with the aid of drawing figures, and are not limited to those embodiments; rather, they will include any changes that do not constitute departures from the spirit and scope of the present application.
Claims
1. A method for preparing a black film, characterized in that, include: A polyethylene glycol aqueous solution is prepared by mixing polyethylene glycol and deionized water, and the polyethylene glycol aqueous solution is atomized to form a polyethylene glycol water mist. The pretreated carbon black particles are brought into full contact with the polyethylene glycol water mist to generate carbon black particles coated with the polyethylene glycol. The carbon black particles coated with the polyethylene glycol were freeze-dried. Under yellow light, polyethylene glycol diacrylate, polyacrylate and methoxy polyethylene glycol acrylate are dissolved in deionized water to form a mixture. Freeze-dried carbon black particles are added to the mixture and stirred. A silicone-free polyether defoamer is added to the mixture and stirred to generate a stock solution. The stock solution is then ground and coated onto the surface of a carrier film to form a coating. The carrier film with the coating is then dried. The dried carrier film with the coating is irradiated with ultraviolet light; After irradiation by the ultraviolet lamp, the coating is detached from the carrier film to obtain the prepared black film; The polyacrylate comprises an alkyl group, wherein the alkyl group has no more than 3 carbon atoms.
2. The method for preparing the black film according to claim 1, characterized in that, The polyacrylate includes at least one of polymethyl acrylate, polyethyl acrylate, and polypropyl acrylate.
3. The method for preparing the black film according to claim 1, characterized in that, The mass ratio of polyethylene glycol diacrylate to methoxy polyethylene glycol acrylate is greater than or equal to 200:3 and less than or equal to 200:1; the mass ratio of polyethylene glycol diacrylate to polyacrylate is greater than or equal to 5:2 and less than or equal to 5:1; the relative molecular mass of polyethylene glycol diacrylate is greater than or equal to 4000 and less than or equal to 10000; the relative molecular mass of polyacrylate is greater than or equal to 500 and less than or equal to 2000; and the relative molecular mass of methoxy polyethylene glycol acrylate is greater than or equal to 300 and less than or equal to 3000.
4. The method for preparing the black film according to claim 1, characterized in that, The polyethylene glycol has a relative molecular mass greater than or equal to 1000 and less than or equal to 3000, and the concentration of the polyethylene glycol aqueous solution is greater than or equal to 40% and less than or equal to 60%.
5. The method for preparing the black film according to claim 1, characterized in that, When the methoxy polyethylene glycol acrylate is dissolved in deionized water, the temperature of the deionized water is greater than or equal to 20°C and less than or equal to 40°C.
6. The method for preparing the black film according to claim 1, characterized in that, The pretreated carbon black particles have a particle size greater than or equal to 30 nm and less than or equal to 100 nm; and / or The carbon black particles after grinding have a particle size greater than or equal to 30 nm and less than or equal to 70 nm.
7. The method for preparing the black film according to any one of claims 1 to 6, characterized in that, The stock solution is coated on the surface of the carrier film to form a coating with a thickness greater than or equal to 2 μm and less than or equal to 8 μm; and / or The carrier membrane is a PEEK membrane.
8. The method for preparing the black film according to any one of claims 1 to 6, characterized in that, When drying the carrier film with the coating, the drying temperature is greater than or equal to 70°C and less than or equal to 90°C, and the drying time is greater than or equal to 0.5 hours and less than or equal to 1.5 hours.
9. The method for preparing the black film according to any one of claims 1 to 6, characterized in that, The shrinkage of the black film before and after detachment is greater than or equal to 0.5% and less than or equal to 1%.
10. The method for preparing the black film according to any one of claims 1 to 6, characterized in that, The mass ratio of the silicone-free polyether defoamer to the polyethylene glycol diacrylate is greater than or equal to 1 / 300 and less than or equal to 1 / 200. and / or The silicone-free polyether defoamers include: fatty alcohol defoamers.
11. The method for preparing the black film according to any one of claims 1 to 6, characterized in that, When the dried carrier film with the coating is irradiated with ultraviolet light, the irradiation time of the ultraviolet light is greater than or equal to 3 minutes and less than or equal to 15 minutes.
12. A black film, characterized in that, The black film is prepared using the method for preparing a black film as described in any one of claims 1 to 11.
13. The black film according to claim 12, characterized in that, The black-white density value D of the black film is greater than or equal to 0 and less than or equal to 0.06.