A new screen made of a new material which can be partially imidized

Abstract

The application provides a novel screen plate made of a novel material capable of local imidization, and relates to the technical field of screen plate manufacturing.The preparation method of the screen plate comprises the following steps: S1, composite of metal mesh and polyester mesh, in a pressing equipment, the metal mesh with a thickness of 100 microns is composited with the polyester mesh, and a polyethylene film with a thickness of 10 microns is used as an adhesive.The combination of the polyimide precursor, the thermal bridging agent and the catalyst makes the imidization condition in the screen plate manufacturing process more easily realized, the wear resistance and the flexibility of the material are enhanced, and the service life is prolonged.Through direct blade coating of the polyimide precursor on the metal mesh, baking and local high-temperature secondary heating, a polyimide film is formed, so that the technological process is greatly simplified.In addition, by using the laser cutting technology, the polyimide film can be accurately cut, high-precision patterns can be manufactured, and the demand of fine printing can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screen making, and particularly relates to a novel screen made of a novel material capable of local imidization. BACKGROUND

[0002] The technical field of screen making mainly involves template design and preparation in the fields of printing, electronic manufacturing and precise coating. This field covers the design, material selection, manufacturing process and application of screens. The screen is the core part of screen printing, through which ink, slurry or other materials can be accurately transferred to the surface of the printing material to form a specific pattern or functional layer. In electronic manufacturing, screens are widely used in the manufacturing of circuit boards, touch screens, batteries and other devices, and through high-precision printing technology, the accurate transfer of complex patterns and circuits is achieved. With the development of technology, the innovation of screen materials and manufacturing technology continuously improves the printing precision, durability and adaptability, and promotes the manufacturing of various high-end products.

[0003] However, this method not only has limited precision, but also has a short service life of the screen. With the development of technology, the mainstream screen making process is to combine metal mesh and PI film through high-temperature hot pressing, then use a photosensitive emulsion for edge sealing treatment, and finally complete the pattern making by laser cutting. Although this method improves the precision, the process flow is complex, and the edge sealing area still affects the service life of the screen. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art and provide a novel screen made of a novel material capable of local imidization.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a novel screen made of a novel material capable of local imidization, the preparation method of the screen comprises the following steps:

[0006] S1, composite of metal mesh and polyester mesh, in the pressing equipment, the metal mesh with a thickness of 100 microns and the polyester mesh are compounded, a polyethylene film with a thickness of 10 microns is used as an adhesive, during the compounding process, the flatness between the metal mesh and the polyester mesh is ensured, any wrinkles or bubbles are avoided, and a composite mesh material is obtained;

[0007] S2, preparation of polyimide precursor coating solution, in a reaction kettle, polyimide precursor, thermal bridging agent and catalyst are mixed in a mass ratio of 2:1:0.1, a high-speed stirrer is used to stir at a speed of 2000 revolutions per minute for 30 minutes to ensure uniform mixing, after stirring is completed, the mixed solution is heated to 80 degrees Celsius and maintained for 1 hour, so that the coating solution reaches the best coating viscosity, and the polyimide precursor coating solution is obtained.

[0008] S3, polyimide precursor coating is carried out on the composite mesh material, the polyimide precursor coating solution is uniformly coated on the surface of the composite mesh material on the automatic scraping coating equipment, and after the coating is completed, the composite mesh coated with the polyimide precursor is obtained;

[0009] S4, preliminary baking and curing, the composite mesh coated with the polyimide precursor is baked in a hot air circulating baking equipment, the polyimide precursor is partially cured to form a preliminary solid film, and after baking, the partially cured composite mesh is obtained;

[0010] S5, ion beam area bombardment, the surface of the partially cured composite mesh is subjected to ion beam bombardment in a vacuum ion beam bombardment equipment, the bombardment parameters are set as ion energy 1000eV, beam current density 0.5mA / cm², and time control 15 minutes, the ion beam selectively acts on the target area to change the chemical reactivity of each target area, preparing for subsequent imidization treatment, and the composite mesh subjected to ion beam treatment is obtained;

[0011] S6, local high-temperature secondary heating, the composite mesh subjected to ion beam treatment is subjected to local high-temperature heating treatment, the target area is heated to 250 degrees Celsius using an infrared heating equipment for 5 minutes, so as to promote the imidization reaction of the polyimide precursor in each target area, and after heating, the composite mesh with local imidization area is obtained;

[0012] S7, ion beam assisted imidization treatment, the composite mesh with local imidization area is subjected to auxiliary treatment again using the ion beam equipment, the depth and range of the imidization reaction are further controlled, the ion beam energy is increased to 1200eV, the beam current density is controlled at 0.7mA / cm², and the treatment time is extended to 20 minutes, after this step, the chemical structure of the imidization area is more stable, and the composite mesh subjected to ion beam assisted treatment is obtained.

[0013] S8, precise shaping of the polyimide film, the composite mesh subjected to ion beam assisted treatment is subjected to overall high-temperature and pressure treatment in a high-temperature pressing equipment, the temperature is set to 300 degrees Celsius, the pressure is set to 10MPa, and the duration is 30 minutes, the polyimide film is completely formed on the entire surface of the composite mesh through high-temperature and pressure, and the shaped polyimide film composite mesh is obtained.

[0014] Preferably, the method further comprises: S9, laser cutting the pattern, cutting the shaped polyimide film composite screen according to the preset pattern in the laser cutting device, the laser power is set to 20W, the cutting speed is 0.1m / s, and the cutting accuracy is controlled within ±10 microns; after laser cutting, the polyimide film composite screen with high-precision pattern is obtained.

[0015] Preferably, the method further comprises: S10, product screen inspection and trimming, quality inspection and trimming of the polyimide film composite screen with high-precision pattern, using a high-precision microscope to detect the pattern accuracy, checking for defects or cracks, repairing or reprocessing unqualified areas to ensure product quality, and obtaining new screen products meeting high-precision standards after inspection and trimming.

[0016] Preferably, in the S1 step, the temperature of the pressing device is set to 150 degrees Celsius, the pressure is 5MPa, and the pressing time is controlled within 30 minutes.

[0017] Preferably, in the S3 step, the scraping speed of the automatic scraping device is controlled within 0.5m / min, and the scraping thickness is controlled within 20 microns, ensuring that the coating liquid covers the entire screen surface without bubbles or unevenness.

[0018] Preferably, in the S4 step, the baking temperature of the hot air circulation baking device is set to 150 degrees Celsius, and the baking time is 60 minutes.

[0019] 1. Compared with the prior art, the polyimide precursor, thermal bridging agent and catalyst are combined to make the imidization conditions in the screen making process easier to achieve, enhance the wear resistance and flexibility of the material, and prolong the service life. By directly scraping the polyimide precursor on the metal screen, and then baking and locally heating at high temperature for the second time, a polyimide film is formed, thereby greatly simplifying the process flow. In addition, the laser cutting technology can accurately cut the polyimide film to make high-precision patterns to meet the needs of fine printing.

[0020] 2、Compared with the prior art, the present application greatly improves the interfacial bonding strength of the polyimide film through the synergistic effect of ion beam bombardment and high temperature heating, significantly enhancing the adhesion between the film and the metal screen mesh. This enhanced interfacial bonding not only improves the stability of the screen under high stress conditions, but also prevents delamination or peeling that may occur during use. In addition, the precise control capability of the ion beam allows the imidization process to occur only in specific areas, avoiding excessive processing or material waste, thereby further improving production efficiency and material utilization. The screen made by this method performs well in terms of chemical corrosion resistance and thermal deformation resistance, and can adapt to more demanding working environments, especially in the fields of industrial printing and electronic manufacturing that require long-term high precision. This enhanced durability and reliability significantly extend the service life of the screen, reducing the frequency of replacement and maintenance costs, further enhancing the economic efficiency and practicality of the process.

[0021] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0022] The technical solutions of the present application will be further described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0024] Figure 1 A preparation step diagram of a new type of screen made of a new type of material capable of local imidization is proposed. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with the help of the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] Example 1, a new type of screen made of a new type of material capable of local imidization, the preparation method of the screen includes the following steps:

[0027] S1, composite of metal mesh and polyester mesh, in a pressing device, a metal mesh with a thickness of 100 microns and a polyester mesh are compounded, a polyethylene film with a thickness of 10 microns is used as an adhesive, during the compounding process, the metal mesh and the polyester mesh are ensured to be flat, and any wrinkles or bubbles are avoided, and a composite mesh material is obtained;

[0028] S2, preparation of polyimide precursor coating solution, in a reaction kettle, polyimide precursor, thermal bridging agent and catalyst are mixed in a mass ratio of 2:1:0.1, a high-speed stirrer is used to stir at a speed of 2000 revolutions per minute for 30 minutes to ensure uniform mixing, after stirring is completed, the mixed solution is heated to 80 degrees Celsius and maintained for 1 hour, so that the coating solution reaches the best coating viscosity, and a polyimide precursor coating solution is obtained;

[0029] S3, polyimide precursor coating on the composite mesh material, in an automatic doctor blade coating device, the polyimide precursor coating solution is uniformly coated on the surface of the composite mesh material, and after coating is completed, a composite mesh coated with polyimide precursor is obtained;

[0030] S4, preliminary baking and curing, in a hot air circulating baking device, the composite mesh coated with polyimide precursor is subjected to baking treatment, the polyimide precursor is partially cured, and a preliminary solid film is formed, and after baking, a partially cured composite mesh is obtained;

[0031] S5, ion beam area bombardment, in a vacuum ion beam bombardment device, the surface of the partially cured composite mesh is subjected to ion beam bombardment, the bombardment parameters are set as ion energy 1000 eV, beam current density 0.5 mA / cm², and time control 15 minutes, the ion beam selectively acts on the target area, changes the chemical reactivity of each target area, and prepares for subsequent imidization treatment, and a composite mesh treated by ion beam is obtained;

[0032] S6, local high-temperature secondary heating, the composite mesh treated by ion beam is subjected to local high-temperature heating treatment, an infrared heating device is used to heat the target area to 250 degrees Celsius and maintain for 5 minutes, so as to promote the imidization reaction of the polyimide precursor in each target area, and after heating, a composite mesh with local imidization area is obtained;

[0033] S7, ion beam assisted imidization treatment, the composite mesh with local imidization area is subjected to assisted treatment by ion beam device again, to further control the depth and range of imidization reaction, the ion beam energy is increased to 1200 eV, the beam current density is controlled to 0.7 mA / cm², and the treatment time is extended to 20 minutes, after this step, the chemical structure of the imidization area is more stable, and a composite mesh treated by ion beam assisted treatment is obtained.

[0034] In this embodiment, it also includes: S8, precise forming of the polyimide film, the composite screen wire subjected to the ion beam assisted treatment is subjected to overall high-temperature pressurization treatment in a high-temperature pressurization device, the temperature is set to 300 degrees Celsius, the pressure is set to 10 MPa, and the duration is 30 minutes. The polyimide film is completely formed on the entire surface of the composite screen wire through high-temperature pressurization, has excellent wear resistance and structural stability, and the formed polyimide film composite screen wire is obtained.

[0035] In this embodiment, it also includes: S9, laser cutting pattern, the formed polyimide film composite screen wire is cut according to a pre-set pattern in a laser cutting device, the laser power is set to 20 W, the cutting speed is 0.1 m / s, the cutting accuracy is controlled to be ±10 microns, and the polyimide film composite screen wire with high-precision pattern is obtained after laser cutting.

[0036] In this embodiment, it also includes: S10, finished screen inspection and trimming, quality inspection and trimming are performed on the polyimide film composite screen wire with high-precision pattern, high-precision microscope is used to detect pattern accuracy, whether there are defects or cracks is checked, unqualified areas are repaired or reprocessed, product quality is ensured, and the new screen finished product meeting the high-precision standard is obtained after inspection and trimming.

[0037] In this embodiment, in the S1 step, the temperature of the pressurization device is set to 150 degrees Celsius, the pressure is 5 MPa, and the pressurization time is controlled to be 30 minutes.

[0038] In this embodiment, in the S3 step, the doctor blade coating speed of the automatic doctor blade coating device is controlled to be 0.5 m / min, and the doctor blade coating thickness is controlled to be 20 microns, so that the coating liquid covers the entire screen wire surface without bubbles or unevenness.

[0039] In this embodiment, in the S4 step, the baking temperature of the hot air circulation baking device is set to 150 degrees Celsius, and the baking time is 60 minutes.

[0040] Experimental method:

[0041] Wear resistance test: The test is performed according to GB / T 9867-2008 “Determination of Wear Resistance of Plastic Films and Sheets”. A Taber wear tester is used, a CS-10 grinding wheel is selected, and a load of 500 g is applied. The experimental conditions are a rotation speed of 60 rpm, a sample size of 100 mm × 100 mm, a grinding wheel rotation number of 500 revolutions, a test environment temperature of 23±2°C, and a relative humidity of 50±5%. The test steps include fixing the sample on the Taber wear tester, starting the device after selecting the appropriate grinding wheel and load, and recording the mass loss (mg) of the sample after 500 revolutions as the wear resistance result.

[0042] Tensile strength test: Tensile strength test was performed according to GB / T 1040.3-2006 Determination of tensile properties of plastics - Part 3: film and sheet. The testing equipment was an electronic tensile testing machine equipped with a 500N sensor. The experimental conditions were a tensile speed of 50 mm / min, a sample size of 10 mm in width, 4 mm in thickness, and 100 mm in length, a testing environment temperature of 23±2°C, and a relative humidity of 50±5%. The testing procedure included cutting the sample according to the specified size, fixing it in the clamps of the tensile testing machine, starting the equipment after setting the tensile speed, measuring and recording the maximum tensile force at the breaking of the sample, and calculating the tensile strength (MPa).

[0043] Heat resistance test: Heat resistance test was performed according to GB / T 17391-1998 Plastics - Determination of heat properties - Heat distortion temperature. The testing equipment was a heat distortion temperature tester, and the experimental conditions were a heating speed of 120°C / h, a sample size of 80 mm x 10 mm x 4 mm, and a load of 1.82 MPa. The testing procedure included fixing the sample in the tester, applying a standard load of 1.82 MPa, setting the heating speed to 120°C / h and starting the equipment, and recording the temperature at which the sample deformed by 1 mm as the heat resistance result.

[0044] Surface smoothness test: Surface smoothness test was performed according to GB / T 18514-2001 Plastics - Determination of surface roughness. The testing equipment was a surface roughness tester, and the experimental conditions were a sampling area of 20 mm x 20 mm, a measurement length of 5 mm, and a measurement speed of 0.5 mm / s. The testing procedure included fixing the sample on the testing platform of the surface roughness tester, setting the measurement parameters and starting the equipment, recording and calculating the surface roughness value (Ra), and taking it as the result of surface smoothness.

[0045] The finished material prepared in Example 1 was subjected to experiments, and Comparative Example 1 was a commercially available product. The experimental methods were as follows:

[0046] Table 1

[0047]

[0048] From the experimental results, it can be seen that Example 1 has significant advantages over Comparative Example 1. First, in terms of wear resistance, Example 1 exhibits more excellent durability, indicating that it is more durable under friction conditions. Second, in terms of tensile strength, the material of Example 1 exhibits higher strength, indicating that it is more solid and reliable when subjected to tensile force. In addition, in terms of heat resistance, the material of Example 1 can maintain its mechanical properties at a higher temperature, indicating that it has better thermal stability. Finally, Example 1 also shows better results in surface smoothness, meaning that its surface is smoother, suitable for application scenarios that require fine processing. These advantages collectively indicate that Example 1 is superior to Comparative Example in multiple key performance indicators, demonstrating higher material performance and application value.

[0049] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A novel screen made of a novel material that can be locally imidized, characterized in that, The preparation method of the screen includes the following steps: S1, composite of metal mesh and polyester mesh, in a pressing equipment, the metal mesh with a thickness of 50-200 microns is compounded with the polyester mesh, a polyethylene film with a thickness of 1-20 microns is used as an adhesive, during the compounding process, the flatness between the metal mesh and the polyester mesh is ensured, and any wrinkles or bubbles are avoided, and a composite mesh material is obtained; S2, preparation of polyimide precursor coating solution, in a reaction kettle, polyimide precursor, thermal bridging agent and catalyst are mixed in a mass ratio of 2:1:0.1, a high-speed stirrer is used to stir at a speed of 1000-4000 rpm for 10-60 minutes to ensure uniform mixing, after stirring is completed, the mixed solution is heated to 70-90 degrees Celsius for 1 hour, so that the coating solution reaches the best coating viscosity, and a polyimide precursor coating solution is obtained; S3, polyimide precursor coating of the composite mesh material, the polyimide precursor coating solution is uniformly coated on the surface of the composite mesh material in an automatic doctor blade coating equipment, and after coating is completed, a composite mesh coated with polyimide precursor is obtained; S4, preliminary baking and curing, in a hot air circulation baking equipment, the composite mesh coated with polyimide precursor is baked and treated, the polyimide precursor is partially cured, and a preliminary solid film is formed, and after baking, a partially cured composite mesh is obtained; S5, ion beam area bombardment, in a vacuum ion beam bombardment equipment, the surface of the partially cured composite mesh is subjected to ion beam bombardment, the bombardment parameters are set as ion energy 1000-2000 eV, beam current density 0.4-0.6 mA / cm², and time control 15 minutes, the ion beam selectively acts on the target area, changes the chemical reactivity of each target area, and prepares for subsequent imidization treatment, and a composite mesh treated by ion beam is obtained; S6, local high-temperature secondary heating, the composite mesh treated by ion beam is subjected to local high-temperature heating treatment, an infrared heating equipment is used to heat the target area to 250 degrees Celsius for 5 minutes, the imidization reaction of the polyimide precursor in each target area is promoted, and after heating, a composite mesh with local imidization area is obtained; S7, ion beam assisted imidization treatment, the composite mesh with local imidization area is subjected to auxiliary treatment by using the ion beam equipment again, the depth and range of the imidization reaction are further controlled, the ion beam energy is increased to 1200 eV, the beam current density is controlled at 0.7 mA / cm², and the treatment time is extended to 20 minutes, after this step, the chemical structure of the imidization area is more stable, and a composite mesh treated by ion beam assisted treatment is obtained; S8, precise shaping of the polyimide film, in a high-temperature pressing equipment, the composite mesh treated by ion beam assisted treatment is subjected to overall high-temperature pressing treatment, the temperature is set to 300 degrees Celsius, the pressure is set to 10 MPa, and the duration is 30 minutes, the polyimide film is completely formed on the surface of the entire composite mesh through high-temperature pressing, and a shaped polyimide film composite mesh is obtained.

2. The novel screen made of the novel material which can be partially imidized according to claim 1, characterized in that, It also includes: S9, laser cutting pattern, according to the pre-set pattern, the shaped polyimide film composite screen is cut in the laser cutting equipment, the laser power is set to 20W, the cutting speed is 0.1m / s, the cutting precision is controlled within ±10 microns, after laser cutting, the polyimide film composite screen with high-precision pattern is obtained.

3. The novel screen made of the novel material which can be partially imidized according to claim 2, characterized in that, Also includes: S10, finished screen inspection and finishing, the quality inspection and finishing of the polyimide film composite screen with high-precision pattern is carried out, the high-precision microscope is used to detect the pattern precision, whether there is flaw or crack is checked, the unqualified area is repaired or reprocessed, the product quality is ensured, after inspection and finishing, the new screen finished product meeting the high-precision standard is obtained.

4. The novel screen made of the topically iminizable novel material according to claim 1, characterized by: In S1 step, the temperature of the pressing equipment is set to 150 degrees Celsius, the pressure is 5MPa, and the pressing time is controlled within 30 minutes.

5. The novel screen made of the topically iminizable novel material according to claim 1, characterized by: In S3 step, the doctor blade coating speed of the automatic doctor blade coating equipment is controlled within 0.5m / min, the doctor blade coating thickness is controlled within 20 microns, ensuring that the coating liquid covers the entire screen surface without bubbles or unevenness.

6. The novel screen made of the topically iminizable novel material according to claim 1, characterized by: In S4 step, the baking temperature of the hot air circulation baking equipment is set to 150 degrees Celsius, and the baking time is 60 minutes.

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