Non-photosensitive latex, silk-screen printing plate and preparation method of silk-screen printing plate

Abstract

The invention discloses non-photosensitive latex, a silk-screen printing plate and a preparation method of the non-photosensitive latex, and relates to the technical field of printing. The non-photosensitive latex comprises a prepolymer, a cross-linking agent, a catalyst and an organic auxiliary agent, the prepolymer comprises polysiloxane containing vinyl, and the cross-linking agent comprises polysiloxane containing SiH groups. The non-photosensitive latex is moderate in viscosity, the prepolymer and the cross-linking agent in the non-photosensitive latex can react and be cured after being heated under the action of the catalyst, and the cured non-photosensitive latex has relatively high strength, low brittleness and stable properties, is not easy to react with slurry used for printing or be dissolved, can replace a photosensitive material in the prior art, improves the printing precision, and is suitable for large-scale production. The method can be used in the field of silk-screen printing, and is especially used for printing products with high pattern precision requirements such as packaging tube shell conductive circuits, such as packaging tube shells.

Description

Technical Field

[0001] The invention relates to the technical field of printing, and in particular to a non-photosensitive emulsion, a screen printing screen and a preparation method thereof. Background Art

[0002] Screen printing is an important printing method and is widely used in the manufacture of ceramic electronic components. For example, in the package shell in the 5G communication field, the conductive wiring on the ceramic body needs to be formed by screen printing. Screen printing usually uses a screen with graphics as a printing plate, and uses the principle that the mesh of the graphic part of the screen printing plate is transparent to ink, while the non-graphic part is not. At present, the effect of transparent part of the graphic and non-graphic part is generally achieved by combining light-shielding film and photosensitive latex.

[0003] The existing screen manufacturing process specifically includes the steps of scraping glue, exposing and developing. Specifically, after scraping the photosensitive emulsion on the screen, the photosensitive emulsion of the image part of the screen is shielded with film. The photosensitive emulsion of the non-image part undergoes chemical changes and hardens after exposure, and will remain on the screen to block the mesh, while the photosensitive emulsion of the image part cannot be hardened because it has not been exposed and is washed away. However, this manufacturing method is too cumbersome and complicated. The cost of the film used for shielding to control whether the photosensitive emulsion hardens is high. In addition, due to expansion and contraction after exposure, the size difference between the image part and the film is large. At the same time, the cleaning during the development process will cause the photosensitive material of the non-image part to fall off, aggravating the error of the printed pattern and causing subsequent poor printing.

[0004] As the size of ceramic electronic components becomes smaller and smaller, the requirements for printing accuracy and quality are also getting higher and higher. It is necessary to develop a new material to replace the existing photosensitive material, reduce the use of light-shielding film, and improve the existing screen manufacturing method. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, the purpose of the present invention is to provide a non-photosensitive latex, including a specific prepolymer and a cross-linking agent and a specific proportion of organic additives, which has stable properties after curing and can replace the existing photosensitive material to fill the non-image part of the screen to improve the printing accuracy.

[0006] A second aspect of the present invention is to provide a screen printing screen.

[0007] A third aspect of the present invention is to provide a method for preparing a screen printing screen.

[0008] A fourth aspect of the present invention is to provide an application of a screen printing screen.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A non-photosensitive latex comprising a prepolymer, a cross-linking agent, a catalyst and an organic auxiliary agent;

[0011] The prepolymer includes a vinyl-containing polysiloxane, and the crosslinking agent includes a SiH-group-containing polysiloxane;

[0012] The non-photosensitive latex of the present invention has moderate viscosity, and the prepolymer and the cross-linking agent therein can be reacted and cured by heating under the action of a catalyst. After curing, it has high strength, low brittleness, stable properties, and is not easy to react or dissolve with the slurry used for printing. Therefore, the non-photosensitive latex can block the mesh in the screen and can well replace the photosensitive material of the prior art. At the same time, since the non-photosensitive latex of the present invention does not need to be exposed and cured, the use of light-shielding film can be avoided, thereby avoiding the problem of large size difference between the screen image part and the film, and improving printing accuracy.

[0013] In some embodiments of the present invention, the vinyl-containing polysiloxane comprises a structure as shown in formula (I):

[0014]

[0015] Among them, R 1 , R 2 , R 3 Each of the following is independently a saturated hydrocarbon group or an aromatic group having ≤6 carbon atoms.

[0016] In some embodiments of the present invention, the R 1 , R 2 , R 3 Each of the following is independently selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, hexyl and phenyl.

[0017] In some specific embodiments of the present invention, the R 1 It is at least one of a methyl group, an ethyl group, and a propyl group.

[0018] In some specific embodiments of the present invention, the R 2 Methyl or butyl.

[0019] In some specific embodiments of the present invention, the R 3 It is methyl or ethyl.

[0020] In some embodiments of the present invention, the polysiloxane containing SiH groups comprises a structure as shown in formula (II):

[0021]

[0022] Among them, R 4 , R 5 , R6 They are independently saturated hydrocarbon groups or aromatic groups having ≤ 6 carbon atoms.

[0023] In some embodiments of the present invention, the R 4 , R 5 , R 6 Each of the following is independently selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, hexyl and phenyl.

[0024] In some specific embodiments of the present invention, the R 4 It is at least one of a methyl group, a propyl group, and a hexyl group.

[0025] In some specific embodiments of the present invention, the R 5 It is methyl or ethyl.

[0026] In some specific embodiments of the present invention, the R 6 It is methyl or ethyl.

[0027] In some embodiments of the present invention, the mass ratio of the prepolymer to the organic additive is (3-17):1.

[0028] In some embodiments of the present invention, the mass ratio of the prepolymer to the organic additive is (4-12):1.

[0029] In some embodiments of the present invention, the mass ratio of the prepolymer to the organic additive is (4-8):1.

[0030] In some specific embodiments of the present invention, the mass ratio of the prepolymer to the organic additive is (4.5-7.5):1.

[0031] In the non-photosensitive latex of the present invention, the mass ratio of the prepolymer to the organic additive is related to the viscosity and contact angle of the non-photosensitive latex. By adjusting the mass ratio of the two, on the one hand, the viscosity of the non-photosensitive latex can be further regulated within an appropriate range to ensure that the non-photosensitive latex can be applied to the screen with better effects; on the other hand, the contact angle of the non-photosensitive latex after curing can be regulated to avoid the contact angle between the non-photosensitive latex and the printing slurry being similar, thereby causing printing plugging.

[0032] In some embodiments of the present invention, the mass ratio of the prepolymer to the cross-linking agent is (2-17):1.

[0033] In some embodiments of the present invention, the mass ratio of the prepolymer to the cross-linking agent is (3-10):1.

[0034] In some specific embodiments of the present invention, the mass ratio of the prepolymer to the cross-linking agent is (3-7):1.

[0035] The present invention can further control the thickness of the non-photosensitive latex after curing by adjusting the mass ratio of the prepolymer to the crosslinking agent in the non-photosensitive latex, thereby controlling the ink leakage and the printing thickness; and can further regulate the mechanical properties of the non-photosensitive latex after curing: when the mass ratio of the prepolymer to the crosslinking agent is relatively high, the density of the crosslinking sites is low, and it is difficult to ensure the mechanical strength of the non-photosensitive latex after curing, and the non-photosensitive latex cures too quickly and starts to cure before being formed, which affects the flatness after curing; and when the mass ratio is too low, the non-photosensitive latex is brittle after curing, and the silk screen printing screen prepared with the non-photosensitive latex is more easily damaged.

[0036] In some embodiments of the present invention, n / (n+m)=2-10% in the vinyl-containing polysiloxane;

[0037] In some embodiments of the present invention, n / (n+m) in the vinyl-containing polysiloxane is 4-10%.

[0038] In some specific embodiments of the present invention, n / (n+m) in the vinyl-containing polysiloxane is 4-8%.

[0039] By ensuring the content of vinyl segments in the vinyl-containing polysiloxane, it is beneficial to improve the strength of the non-photosensitive latex after curing.

[0040] In some embodiments of the present invention, b / (a+b)=5-30% in the polysiloxane containing SiH groups;

[0041] In some embodiments of the present invention, in the polysiloxane containing SiH groups, b / (a+b)=10-25%.

[0042] In some specific embodiments of the present invention, in the polysiloxane containing SiH groups, b / (a+b)=15-25%.

[0043] By further ensuring the content of SiH groups in the polysiloxane containing SiH groups, and coordinating with the content of vinyl groups in the polysiloxane containing vinyl groups, it is ensured that the non-photosensitive latex has a higher crosslinking density after curing, and the strength of the non-photosensitive latex after curing is improved. However, when the content of SiH groups in the polysiloxane containing SiH groups is high, the brittleness of the screen increases, which is not conducive to printing.

[0044] In some embodiments of the present invention, the weight average molecular weight of the vinyl-containing polysiloxane is 30,000 to 200,000.

[0045] In some embodiments of the present invention, the weight average molecular weight of the vinyl-containing polysiloxane is 50,000 to 160,000.

[0046] In some specific embodiments of the present invention, the weight average molecular weight of the vinyl-containing polysiloxane is 50,000-60,000.

[0047] In some embodiments of the present invention, the weight average molecular weight of the polysiloxane containing SiH groups is 3,000 to 10,000.

[0048] In some embodiments of the present invention, the weight average molecular weight of the SiH group-containing polysiloxane is 5,000 to 10,000.

[0049] In some specific embodiments of the present invention, the weight average molecular weight of the polysiloxane containing SiH groups is 8,000 to 10,000.

[0050] The present invention can better ensure that the screen has high strength by further limiting the molecular weight of vinyl-containing polysiloxane and SiH-containing polysiloxane. When the molecular weight is low, the strength of the non-photosensitive latex after curing is reduced, lower than 26N, and it is more likely to be damaged during printing, affecting production; when the molecular weight is too high, the viscosity of the non-photosensitive latex is large, which is not conducive to printing when the screen printing screen is prepared by electronic printing.

[0051] In some embodiments of the present invention, the non-photosensitive emulsion comprises the following components by mass fraction:

[0052] Prepolymer 65-85%, cross-linking agent 5-25%, catalyst 0.1-0.6%, organic auxiliary agent 5-15%.

[0053] In some embodiments of the present invention, the mass fraction of the prepolymer in the non-photosensitive latex is 70-80%.

[0054] In some specific embodiments of the present invention, the mass fraction of the prepolymer in the non-photosensitive latex is 70-75%.

[0055] In some embodiments of the present invention, the mass fraction of the cross-linking agent is 8-20%.

[0056] In some specific embodiments of the present invention, the mass fraction of the cross-linking agent is 10-20%.

[0057] In some embodiments of the present invention, the mass fraction of the catalyst is 0.4-0.6%.

[0058] In some specific embodiments of the present invention, the mass fraction of the catalyst is 0.5-0.6%.

[0059] In some embodiments of the present invention, the mass fraction of the organic additive is 7-15%.

[0060] In some specific embodiments of the present invention, the mass fraction of the organic additive is 9-15%.

[0061] In some embodiments of the present invention, the catalyst comprises a platinum complex.

[0062] In some embodiments of the present invention, the catalyst includes at least one of chloroplatinic acid, tetrakis(triphenylphosphine)platinum, dicyclopentadienylplatinum dichloride, and bis(triphenylphosphine)platinum dichloride.

[0063] In some embodiments of the present invention, the organic auxiliary agent includes a phosphate ester, and more specifically includes at least one of tributyl phosphate, triisobutyl phosphate, and triethyl phosphate.

[0064] The second aspect of the present invention provides a screen printing screen, comprising a screen frame and a screen, wherein the screen comprises a graphic part and a non-graphic part, wherein the non-graphic part is filled with non-photosensitive emulsion before or after curing; the non-photosensitive emulsion is the non-photosensitive emulsion described in the first aspect of the present invention.

[0065] The present invention uses non-photosensitive emulsion instead of the photosensitive material of the prior art to fill the mesh holes of the silk screen of the non-image and text part, which can eliminate the steps of exposure and development and avoid the use of film, thereby reducing the size error between the screen pattern and the design pattern, improving manufacturing accuracy, simplifying the production process and saving costs.

[0066] The third aspect of the present invention provides a method for preparing the screen printing screen according to the second aspect of the present invention, comprising the following steps:

[0067] Mixing a prepolymer, a crosslinking agent, a catalyst and an organic additive to obtain the non-photosensitive latex according to the first aspect of the present invention;

[0068] The pattern of the non-image and text part is introduced into the electronic printing system, and the non-photosensitive latex is printed on the screen of the screen by the electronic printer to form the pattern;

[0069] Heat and cure the non-photosensitive latex to obtain the product.

[0070] In the existing screen printing screen production process, it is necessary to convert the pattern from the design drawing to the film, and then convert the film to the screen pattern. The steps are cumbersome and the pattern size error is large due to the expansion and contraction of the photosensitive adhesive. In the preparation method of the present invention, since the non-photosensitive latex of the present invention is used, the pattern can be directly converted from the design drawing to the screen pattern, and then cured by heating, which is not easy to cause errors and improves the accuracy of the screen pattern.

[0071] In some embodiments of the present invention, the heating temperature is 110-130°C.

[0072] In some embodiments of the present invention, the pattern of the non-graphic part is a CAD pattern.

[0073] A fourth aspect of the present invention provides a use of the screen printing screen described in the second aspect of the present invention in preparing a packaging tube shell.

[0074] The non-photosensitive latex obtained by the invention has high strength and moderate viscosity, can be cured under catalyst and heating conditions, is used for filling screen printing screens, has stable properties, and the screens are not prone to brittleness. The obtained screen printing screens have high dimensional accuracy and can be used in the field of screen printing, and are particularly suitable for preparing circuit patterns of package tube shells by screen printing.

[0075] In some embodiments of the present invention, the conductive circuit pattern of the package shell is printed using the screen printing screen described in the second aspect of the present invention.

[0076] A package shell is a shell used to protect and fix electronic components.

[0077] In some embodiments of the present invention, the method for preparing the package shell comprises the following steps:

[0078] The silk screen printing plate described in the second aspect of the present invention is prepared according to the conductive circuit pattern of the packaging tube shell; the silk screen printing plate is placed on the ceramic green sheet for printing; the printed ceramic green sheets are stacked and then cut; the input terminals and output terminals are sintered to form them; the input terminals and output terminals are installed, combined, brazed, and electroplated with metal parts to obtain the packaging tube shell.

[0079] Compared with the prior art, the present invention has the following beneficial effects:

[0080] (1) The non-photosensitive latex of the present invention has moderate viscosity, and the prepolymer and the cross-linking agent therein can be cured by heating under the action of a catalyst. After curing, it has high strength, low brittleness, stable properties, can block the mesh in the screen, and is not easy to react with or be dissolved by the slurry used for printing after curing, and can replace the photosensitive materials of the prior art. Since the non-photosensitive latex does not need to be cured by exposure, the use of light-shielding film can be avoided, thereby avoiding the problem of large size difference between the image and text part of the screen and the film, and improving printing accuracy.

[0081] (2) The present invention can produce a silk screen printing screen by electronic printing, and adopts non-photosensitive emulsion to replace the traditional photosensitive material, thereby avoiding the steps of scraping glue, drying the screen and developing in the traditional process, simplifying the process of making the screen, and improving the production efficiency. At the same time, it also improves the accuracy of the silk screen pattern and reduces the process cost.

[0082] (3) The screen printing screen obtained by the present invention has high dimensional accuracy and can be used in the field of electronic component manufacturing, especially suitable for printing products with high graphic accuracy requirements such as packaging tube shell conductive circuits. DETAILED DESCRIPTION

[0083] The present invention is further described in detail below by specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial sources or can be obtained by prior art methods. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0084] Some of the raw materials of the following embodiments and comparative examples of the present invention are described as follows:

[0085] Catalyst: chloroplatinic acid, commercially available;

[0086] Organic additive: tributyl phosphate, commonly available in the market.

[0087] Example 1

[0088] This embodiment provides a non-photosensitive latex, including 70% by mass of a prepolymer, 20% by mass of a cross-linking agent, 0.5% by mass of a catalyst, and 9.5% by mass of an organic additive;

[0089] Wherein, the prepolymer is polydimethyl-methylvinylsiloxane, which is equivalent to R in formula (I). 1 , R 2 , R 3 All of them are methyl, with a weight average molecular weight of 50,000, and the mass content of methyl vinyl siloxane segments (including vinyl segments) is n / (n+m)=10wt%;

[0090] The crosslinking agent is polydimethyl-methylsiloxane, which is equivalent to R in formula (II). 4 , R 5 , R 6 All of them are methyl groups, with a weight average molecular weight of 10,000, and the mass content of methylsiloxane segments (segments containing SiH groups) is b / (a+b)=10wt%;

[0091] Formula (I) and formula (II) are shown in the following structures:

[0092]

[0093] Embodiments 2 to 7

[0094] Examples 2 to 7 provide a non-photosensitive emulsion, and the differences from Example 1 are shown in Table 1.

[0095] Table 1 Non-photosensitive emulsion parameter table of Examples 1 to 7

[0096]

[0097]

[0098] In the table, the ratio of prepolymer to cross-linking agent and the ratio of prepolymer to organic additive are all mass ratios.

[0099] Embodiments 8 to 12

[0100] Examples 8 to 12 provide a non-photosensitive emulsion, and the differences from Example 1 are shown in Table 2.

[0101] Table 2 Non-photosensitive emulsion parameter table of Examples 8 to 12

[0102]

[0103] Embodiments 13 to 17

[0104] Examples 13 to 17 provide a non-photosensitive emulsion, and the differences from Example 1 are shown in Table 3.

[0105] Table 3 Non-photosensitive emulsion parameter table of Examples 13 to 17

[0106]

[0107] Examples 18 to 22

[0108] Examples 18 to 22 provide a non-photosensitive emulsion, and the differences from Example 1 are shown in Table 4.

[0109] Table 4 Non-photosensitive emulsion parameter table of Examples 18 to 22

[0110]

[0111] Application Examples 1 to 22

[0112] Application examples 1 to 22 provide a screen printing screen, including a screen frame and a screen, the screen including a graphic part and a non-graphic part, the non-graphic part is filled with the non-photosensitive emulsion of embodiments 1 to 22 respectively; wherein the screen printing screens of application examples 1 to 22 correspond one-to-one to the non-photosensitive emulsions of embodiments 1 to 22, for example, application example 1 corresponds to embodiment 1.

[0113] The method for preparing the screen printing screen of application examples 1 to 22 comprises the following steps:

[0114] S1. Mixing a prepolymer, a crosslinking agent, a catalyst and an organic additive to prepare a non-photosensitive latex;

[0115] S2. The CAD drawing of the non-graphic part of the pattern is imported into the electronic printer system, and the electronic printer prints the non-photosensitive latex directly on the screen of the web to form the corresponding pattern;

[0116] S3. Heat the screen at 120°C for 4 hours to solidify the non-photosensitive latex to obtain a screen printing screen.

[0117] Comparative Example 1

[0118] This comparative example provides a method for preparing a screen printing screen, comprising the following steps:

[0119] S1. Scraping glue: Scraping photosensitive emulsion on the screen; wherein the composition of the photosensitive emulsion, calculated by mass fraction as 100%, includes 9% polyvinyl alcohol, 2% polyacrylic acetate, 9% p-diazodiphenylamine hydrochloride formaldehyde condensate, 1% ethanol, 0.5% propylene glycol, and the balance is water, and the components are mixed and then scraped;

[0120] S2. Exposure: The film is attached to the screen coated with photosensitive emulsion, and then the screen is placed on the glass surface of the exposure machine. The photosensitive emulsion is cured by ultraviolet light. The photosensitive emulsion in the non-image part undergoes chemical changes and hardens after exposure, and will remain on the screen to block the mesh holes, while the photosensitive emulsion in the image part cannot harden because it is not exposed;

[0121] S3. Development: After removing the film, first wet the screen surface with water, then rinse thoroughly with a high-pressure water gun until a clear image is displayed, and then dry the screen to complete the preparation of the screen printing screen of Comparative Example 1.

[0122] Results

[0123] The non-photosensitive emulsion obtained in the above embodiment, and the screen printing screen obtained in the application example and the comparative example were tested. The test method is as shown in Table 5:

[0124] Table 5 Screen printing screen test method table

[0125]

[0126] Furthermore, the parameters of the above embodiment are optimized according to the test indicators in Table 6 below:

[0127] Table 6 Screen printing screen test index table

[0128]

[0129]

[0130] The test results are shown in Table 7 below:

[0131] Table 7 Screen printing screen test results of application examples (embodiments) and comparative examples

[0132] Dimension error (±) / μm Strength / N Viscosity / mPa·s Contact angle / ° Application Example 1 4 28 3354 44 Application Example 2 4 28 3203 59 Application Example 3 7 31 3455 32 Application Example 4 4 29 3397 34 Application Example 5 6 30 3249 48 Application Example 6 7 21 3595 37 Application Example 7 8 24 3201 52 Application Example 8 9 26 3494 43 Application Example 9 9 29 3552 45 Application Example 10 5 30 3593 47 Application Example 11 6 20 3224 42 Application Example 12 3 32 4100 47 Application Example 13 9 26 3288 38 Application Example 14 3 28 3423 40 Application Example 15 6 29 3458 41 Application Example 16 8 19 3218 43 Application Example 17 9 21 3513 45 Application Example 18 10 32 3546 47 Application Example 19 3 28 3322 45 Application Example 20 8 29 3555 46 Application Example 21 4 31 3152 61 Application Example 22 4 29 3950 26 Comparative Example 1 25 30 / 46

[0133] In Table 7, Application Examples 1 to 22 correspond to the non-photosensitive emulsions of Examples 1 to 22; the viscosity data are obtained by directly testing the non-photosensitive emulsions of Examples 1 to 22.

[0134] It can be seen from Table 7 that the non-photosensitive latex of the present invention has a moderate viscosity. The application example of the present invention adopts non-photosensitive latex to prepare the screen printing screen, which has the characteristics of high precision compared with the screen printing screen prepared by traditional photosensitive latex. The size error of the application example of the present invention is ≤10μm, while the size error of the comparison example is as high as 25μm.

[0135] Comparing Application Examples 1 to 22 with Comparative Example 1, Application Examples 1 to 22 all use the non-photosensitive emulsion of the present invention and adopt electronic printing to prepare the screen printing screen, while Comparative Example 1 still uses traditional photosensitive emulsion and adopts traditional scraping-exposure-development process to prepare the screen printing screen. From the test results, the screen pattern accuracy of Application Examples 1 to 22 has obvious advantages over Comparative Example 1.

[0136] By comparing the non-photosensitive emulsions of Examples 1 to 7, 21 to 22 and the screen printing screens of Application Examples 1 to 7, 21 to 22, it can be seen that the ratio of prepolymer, crosslinking agent, catalyst and organic additive in the non-photosensitive emulsion has a certain influence on the viscosity, screen strength and contact angle of the non-photosensitive emulsion. It is further preferred that the mass ratio of prepolymer to crosslinking agent is (3 to 10):1, and the mass ratio of prepolymer to organic additive is (4 to 12):1.

[0137] By comparing the non-photosensitive emulsions of Examples 8 to 12 and the screen printing screens of Application Examples 8 to 12, it can be seen that the molecular weights of the prepolymer and the crosslinking agent in the non-photosensitive emulsion have a certain influence on the viscosity of the non-photosensitive emulsion and the screen strength. The weight average molecular weight of the prepolymer is preferably 50,000 to 160,000, and the weight average molecular weight of the crosslinking agent is preferably 5,000 to 10,000.

[0138] By comparing the non-photosensitive latex of Examples 13 to 17 and the screen printing screens of Application Examples 13 to 17, it can be seen that the content of the vinyl segment in the prepolymer and the content of the SiH group-containing segment in the crosslinking agent have a certain influence on the strength of the screen. The content of the vinyl segment in the prepolymer is preferably 4 to 10 wt%, and the content of the SiH group-containing segment in the crosslinking agent is preferably 10 to 25 wt%.

[0139] In summary, the non-photosensitive latex of the present invention has moderate viscosity, and the prepolymer and the cross-linking agent therein can react and cure by heating under the action of a catalyst. After curing, it has high strength, low brittleness, stable properties, and is not easy to react or be dissolved with the slurry used for printing. It can replace the photosensitive materials of the prior art and improve printing accuracy.

[0140] At the same time, the non-photosensitive emulsion of the present invention can be used to produce the non-image and text part of the screen printing screen by electronic printing, avoiding the steps of scraping glue, drying the screen and developing in the traditional process, simplifying the process of making the screen, improving production efficiency and reducing process costs.

[0141] In addition, since the non-photosensitive latex obtained by the present invention has moderate viscosity and high strength after curing, and can be cured under catalyst and heating conditions and used to fill the screen printing screen, the obtained screen printing screen has high dimensional accuracy. Therefore, the non-photosensitive latex material or screen printing screen can be used in the field of screen printing, especially for printing products with high graphic accuracy requirements such as packaging tubes and shells, conductive circuits, etc.

[0142] The preparation method of the package tube shell comprises the following steps: preparing a screen printing plate filled with the non-photosensitive emulsion of the present invention according to the conductive circuit pattern of the package tube shell; placing the screen printing plate on a ceramic green sheet for printing; stacking the printed ceramic green sheets and then cutting them; sintering to form input terminals and output terminals; installing, combining, brazing and electroplating the input terminals and output terminals with metal parts to obtain the package tube shell.

[0143] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A non-photosensitive emulsion, characterized in that: Including prepolymers, cross-linking agents, catalysts and organic additives; The prepolymer includes polysiloxane containing a vinyl group, and the crosslinking agent includes polysiloxane containing a SiH group.

2. The non-photosensitive emulsion according to claim 1, characterized in that: The vinyl-containing polysiloxane comprises a structure as shown in formula (I): R1, R2, and R3 are independently saturated hydrocarbon groups or aromatic groups with carbon atoms ≤ 6; And / or, the polysiloxane containing SiH groups comprises a structure as shown in formula (II): R4, R5, and R6 are independently saturated hydrocarbon groups or aromatic groups having ≤ 6 carbon atoms.

3. The non-photosensitive emulsion according to claim 1, characterized in that: The mass ratio of the prepolymer to the organic auxiliary agent is (3-17):1; the mass ratio of the prepolymer to the cross-linking agent is (2-17):

1.

4. The non-photosensitive emulsion according to claim 2, characterized in that: In the vinyl-containing polysiloxane, n / (n+m)=2-10%; and / or, in the SiH-group-containing polysiloxane, b / (a+b)=5-30%.

5. The non-photosensitive emulsion according to claim 1, characterized in that: The weight average molecular weight of the vinyl group-containing polysiloxane is 30,000 to 200,000, and / or the weight average molecular weight of the SiH group-containing polysiloxane is 3,000 to 10,000.

6. The non-photosensitive emulsion according to claim 1 or 3, characterized in that: The mass fraction of the prepolymer in the non-photosensitive latex is 65-85%.

7. The non-photosensitive emulsion according to claim 1, characterized in that: The catalyst comprises at least one of chloroplatinic acid, tetrakis(triphenylphosphine)platinum, dicyclopentadienylplatinum dichloride, and bis(triphenylphosphine)platinum dichloride; And / or, the organic auxiliary agent includes at least one of tributyl phosphate, triisobutyl phosphate and triethyl phosphate.

8. A screen printing screen, comprising a screen frame and a screen, wherein the screen comprises a graphic part and a non-graphic part, characterized in that: The non-image and text part is filled with non-photosensitive emulsion; the non-photosensitive emulsion is the non-photosensitive emulsion according to any one of claims 1 to 7.

9. A method for preparing the screen printing screen according to claim 8, characterized in that: The steps include: Mixing a prepolymer, a crosslinking agent, a catalyst and an organic additive to obtain the non-photosensitive latex according to any one of claims 1 to 7; introducing the pattern of the non-image part into an electronic printing system, and printing the non-photosensitive latex on the screen of a screen by an electronic printer to form a pattern; Heat and cure the non-photosensitive latex to obtain the product.

10. Use of the screen printing screen according to claim 8 in preparing a packaging tube shell.

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