Preparation method and application of water-in-oil type emulsified oil ink for porous plate

Abstract

The invention relates to a preparation method and application of water-in-oil type emulsified oil ink for a porous plate, and belongs to the technical field of new materials. The emulsified oil ink comprises the following raw materials: an oil phase: white oil, an organic polymer pigment, an emulsifier and alkyl modified polycarboxylate; and a water phase: purified water, sulfates, diethanol and a sterilizing agent. The preparation method of the emulsified ink comprises the following steps: mixing an oil-phase material and a water-phase material, starting stirring and emulsifying, and vacuumizing by using an energy flow vacuum pump to remove impurities and trace bubbles, thereby obtaining the emulsified ink. The ink prepared by the invention is applied to ink supply types required by a printing kit of a printing facility, the ink passes through a porous plate of an ink box nozzle, is subjected to rolling development by a transfer printing shaft and realizes printing by virtue of an oil-based water-in-oil ink filling core, and is particularly suitable for wide and large-area card paper, paper skin and skin surface; and a print scene including an oil surface that is not compatible with other inks.

Description

Technical Field

[0001] The present invention belongs to the technical field of new materials, and particularly relates to a preparation method and application of a water-in-oil emulsified ink for screen printing. Background Art

[0002] Screen printing water-based ink originated in the mid-19th century. The first person to use screen printing on printed matter was the French textile manufacturer Lyon. He first adopted screen printing technology for textile printing in the early 19th century. Subsequently, in 1904, the West African Rinah Irving in the UK, who got inspiration from the Middle East afterwards, invented screen printing technology, and in 1953, he invented the patent and flew to various countries around the world with outdoor advertising oil paintings, and was quickly widely spread in the field of applied printing.

[0003] The principle of screen printing is to cut holes in a flat plate, and then apply ink, so that the ink material leaks through the pores onto the printing substrate. Specifically, the printing ink is transferred through the printing holes on the screen plate to the printing substrate, and the non-graphic printing ink cannot leak because the mesh holes are blocked, thus completing the printing of the printed matter. This printing method is applicable to various types of ink systems, including indoor, outdoor, gallery, and cardboard, and due to its low cost, convenient speed, and quick adaptability, it is widely used in various desktop printing.

[0004] The development of screen printing technology has also gone through several important stages. For example, in 1981, the American inventor Edison invented the typing stencil printing technology, which was later improved by Shinjiro Horii to form the "stencil" technology. The development of these technologies has not only promoted the application scope of screen printing, but also enhanced its technical theory research.

[0005] In the middle of this century, Edward and Aihua jointly developed a printer with the trade name JIOD550. After several reforms in the middle, the first printer was launched on the market in 1950.

[0006] In 1950, the emulsifier used in the initial stage of screen printing ink was a compound of an indefinite amount of auxiliary additives (including auxiliary additives) based on vegetable oil. The thickening system was composed of organic and inorganic fillers.

[0007] In 1950, vegetable oil-based emulsifiers were used in the initial stage of screen printing ink, and an organic and inorganic filler thickening system was adopted.

[0008] In 1973, pigments began to be used, and natural rosin was added to prevent demulsification.

[0009] In 2004, substances such as white oil were selected, and natural emulsified oils were screened to prevent frosting and oil droplets and avoid oil separation. Before that, the unemulsified solvents and shrinkage holes were not centrifugally removed. At that time, the main consideration was to strengthen emulsification and thickening.

[0010] During the research and development of the water-in-oil ink for stencil printing, due to limited vision, despite continuously improving and restructuring the inner walls around the packaging barrels and the four sides of the metering barrels to eliminate individual cases of non-demulsification, there are still some problems that have not been properly solved: 1. Water and oil separation will occur under natural conditions overnight; 2. On the basis of 1 above, interface disconnection will subsequently occur. 3. Whitening phenomena occur, including particulate white dust, chromatography appears, and the original water-locking and oil-loving ability is lost. Summary of the Invention

[0011] The purpose of the present invention is to provide a preparation method and application of a water-in-oil emulsion ink for stencil printing. The emulsion ink prepared by the method of the present invention has the characteristics of good quality and low price. In particular, it has good water-locking performance and excellent storage stability. After one cycle of three aging tests (medium temperature of 55 degrees, normal temperature, and freezing at minus 19.9 degrees), the emulsion ink does not separate. The method selected for this invention patent has been officially put into mass production, properly solving problems such as human-machine interference, equipment settings, and surrounding environmental factors, and is the preferred method with important value orientation.

[0012] To solve the problems in the background technology, various emulsifiers and dispersants were tried to be readjusted, stirring emulsification was strengthened, and even a method of emulsifying while evacuating with an energy flow vacuum pump was adopted to correct the formulation that could theoretically improve the system. The world's advanced scholars published "Gelath the favorites mumink oil containwater tapicion" in 2021, as well as invention articles at home and abroad (projects not applied for), such as Kenneth 2101US00515A1, Winde1991.00241D, and the domestic (projects not applied for) invention article Tong Zhongzong CN202411743.5, all involve water-in-oil inks. However, it was found that selecting suitable water-in-oil emulsifiers, such as fatty acid salts, fatty alcohol polyoxyethylene ether esters, etc., did not achieve good results. Through data tracking, a preparation method and application of a water-in-oil emulsion ink for stencil printing was found. By adding azo-based organic polymer pigments, such as ordinary black (Black), magenta (Magent), cyan (Cyan), yellow (Yellow), orange (Orange), etc., in the oil phase, a method was theoretically sought to strongly emulsify and disperse the oily droplets formed by the pigments in water. Through equipment such as desktop Hewlett-Packard (HP), Canon, Ricoh, and Epson, through stencil printing, printing of wide-width large areas, high thickness, and non-peeling site paper, oil paper, etc. can be achieved. The ink can penetrate into the base paper within 1 - 5 seconds when placed outside, achieving quantification. Even if it is not cleaned thoroughly and is easy to remain, it can still play an effective role.

[0013] At present, a water-in-oil ink for water-locking stencils and orifice plates has been continuously optimizing its formula in terms of antifreeze and anti-static rheology, and the refinement level of the basic theory of water-in-oil is relatively perfect, but the problem of emulsion breakage at the oil-water interface still occurs.

[0014] By optimizing the emulsification process, water is fully emulsified in the oil-phase material to form a water-in-oil structure. In this structure, the lipophilic groups of the emulsifier are distributed on the surface of the system, and the hydrophilic groups are distributed inside. The inventor selects homologues with different molecular weights and HLB values close to 0-12, which can effectively stabilize this water-in-oil structure. At the same time, adding alkyl-modified polycarboxylate (carbomer 912) can further enhance the emulsification stability, and the effect is significant for at least one year. However, when the inventor uses an organic polymer strong emulsifier in combination with selected emulsifying thickeners such as carbomer 912, complete emulsion breakage prevention has still not been achieved. In addition, after testing materials such as non-drying oily alkyd resin, solid petroleum resin, phenolic resin, acrylic resin, and polyurethane resin, the inventor found that these materials either have an unpleasant odor or insufficient water-locking ability. Preliminary analysis shows that the reason for water-locking failure may be that micro-porous dehydration causes small oil droplets to aggregate into large oil droplets, resulting in perforated chromatography at room temperature, and then water emerges and is difficult to emulsify. Of course, it cannot be excluded that there are individual cases of non-emulsion breakage due to external pressure interference. After multiple rounds of testing, recombination, and preliminary evaluation, strictly speaking, the evaluation method explored by the inventor is currently the most promising effective way to achieve emulsified oil droplets at the oil-water interface and maintain non-emulsion breakage.

[0015] First, the present invention proposes a preparation method for a water-in-oil emulsified ink for stencils, adopting the following technical scheme:

[0016] A preparation method for a water-in-oil emulsified ink for stencils, the raw materials of the emulsified ink including: Oil phase: white mineral oil, organic polymer pigment, emulsifier, alkyl-modified polycarboxylate; Water phase: pure water, sulfate, diethanol, disinfectant.

[0017] The preparation steps of the emulsified ink are as follows: By mixing the oil-phase material and the water-phase material, starting stirring and emulsifying, and at the same time using an energy flow vacuum pump to evacuate impurities and trace bubbles, thereby obtaining the emulsified ink.

[0018] Preferably, the emulsified ink includes the following raw materials in mass percentages:

[0019] The oil phase includes: white mineral oil 5-35%, organic polymer pigment 4-8%, emulsifier 0.5-13%, alkyl-modified polycarboxylate 0.01-0.5%;

[0020] The water phase includes: pure water 50-70%, sulfate 0.01-0.2%, diethanol 5%-10%, disinfectant below 0.1%;

[0021] Among them, the sulfate is anhydrous magnesium sulfate, the organic polymer pigment is an azo-based organic polymer pigment, and the alkyl-modified polycarboxylate is a carbomer-based water-in-oil thickener.

[0022] Preferably, the white mineral oil includes one or more of mineral oil, animal and vegetable aliphatic oils and fats, alkyl acid alkyl isomeric alcohols, alkyl isopropyl butanone, and isomeric ether alcohol esters.

[0023] Preferably, the organic polymer pigment is one or more of an azo-based organic polymer pigment of Anhui Jingzhicai New Materials Co., Ltd., an azo-based organic polymer pigment of Shuanghuan Pigment Co., Ltd., an azo-based organic polymer pigment of Dongguan Taiheng Pigment Co., Ltd., and a benzimidazolone azo pigment.

[0024] Preferably, the emulsifier includes emulsifier G-01, emulsifier R-25, and emulsifier T-02; emulsifier G-01 is a sorbitan ester emulsifier with an HLB value of 4-5; emulsifier R-25 is a sorbitan ester emulsifier with an HLB value of 1-2; emulsifier T-02 is a polyoxyethylene sorbitan ester emulsifier with an HLB value of 9-11; the mass ratio of emulsifier G-01, emulsifier R-25, and emulsifier T-02 is (4-12):(0-8):(0.5-2.5).

[0025] Preferably, the alkyl-modified polycarboxylate is carbomer 912;

[0026] The carbomer 912 includes raw materials with the following mass percentages:

[0027]

[0028] The preparation process of the carbomer 912 is specifically as follows:

[0029] Turn on the heating jacket to raise the temperature and set up a reflux device; pour 3 / 4 of isopropanol into the reaction kettle and heat it up to the reflux temperature of isopropanol, which is 80 - 90 °C; mix all the propylene monomers and 3 / 4 of the peroxide initiator in advance and stir until dissolved, then turn on the stirring of the reaction kettle, and drip the propylene monomer solution containing the initiator into the reaction kettle through a dropping funnel. After the dropping is completed in 1 - 3 hours, rinse the dropping funnel with the remaining 1 / 4 of isopropanol and add the rinsing solution to the reaction kettle to continue the reaction; after heat preservation for 6 hours, add the remaining 1 / 4 of the initiator, and then heat preserve for another 5 hours; then cool down to 45 °C, add sodium hydroxide and continue the reaction for 20 minutes, then stop the reaction and discharge the material; precipitate and separate the mixture with solvents of different solubilities, such as isopropanol, cyclohexane, methanol, methyl ethyl ketone and water, and then separate the solvent by centrifugation. After drying the refined product, carbomer 912 is obtained.

[0030] Preferably, the pure water includes one or more of ozone water, adsorption water, purified water, filtered water and tap water with a conductivity below 10 us / cm.

[0031] Preferably, the disinfectant includes one or more of isothiazolinone disinfectants, anthraquinone disinfectants, and chlorofluoromethane pyrethroid disinfectants; preferably, the disinfectant is an isothiazolinone disinfectant; further, the disinfectant is Kathon disinfectant.

[0032] In a second aspect, the present invention also provides a printing cartridge for a printing facility that can be applied with an emulsified ink prepared by the above preparation method. The ink is developed by rolling through a screen plate of a cartridge nozzle and a transfer shaft, and is printed by filling a core with water-in-oil ink, and is specifically applicable to printing scenarios of cardboard, paperboard, leather surface, and oil surface that is incompatible with other inks.

[0033] The beneficial effects of the present invention are as follows:

[0034] (1) Utilize the bonding effect of emulsifier G-01, emulsifier R-25 and emulsifier T-02 at the oil-water interface, and alkyl-modified polycarboxylates (carbomer 912) to spontaneously combine the aqueous phase into the oil phase chain segments containing organic polymer pigments. At the same time, compound anhydrous magnesium sulfate and diethanol to prevent the product from showing water separation due to frost; select Kathon as the disinfectant to prevent the growth of microorganisms and fungi and avoid demulsification precipitation. Then carry out stirring and emulsification, and remove impurities and odors through a vacuum pump to discharge the bubbles contained therein, and the product preparation is completed. After production, strict inspection and control are required. Use an NDJ-79 rotational viscometer to conduct a basic viscosity test. After the product is aged at 50 °C for 6 - 10 weeks, refrigerated at -19 °C and left standing at room temperature of about 23 °C, and then tested after returning to normal temperature, its anti-demulsification and non-stratification performance is normal and perfect.

[0035] (2) To make azo polymer pigments in black, magenta, cyan, yellow, and orange have more vivid printing performance and color spreading property, and a high comprehensive color value, the key lies in ensuring that the pigment system does not delaminate, does not oil out, does not water out, and has excellent quality. These pigments can be added to the oil phase in the form of water-in-oil and stirred and dispersed during the controlled screen printing process, and then added to the hydrophilic water phase with the help of shear force, showing excellent stability without water separation and delamination. Of course, if there is human interference, such as weathering and drying that cause water loss, it may lead to interface instability. Detailed implementation manners

[0036] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines examples to elaborate in detail on the specific implementation manners, structures, features, and their effects according to the present invention. Emulsifiers G-01, R-25, and emulsifier T-02

[0037] In the embodiments of the present invention, the emulsifier G-01 involved is all selected as S80, sorbitan polyoleate S80 purchased from Guangdong Warner Chemical Co., Ltd.; the emulsifier R-25 is selected as S85, sorbitan polyoleate S85 purchased from Guangdong Warner Chemical Co., Ltd.; the emulsifier T-02 is selected as T61, polyoxyethylene sorbitan polyoleate T61 purchased from Guangdong Runhua Chemical Co., Ltd.

[0038] In all embodiments of the present invention, the alkyl-modified polycarboxylate is all selected as Carbopol 912, and the Carbopol 912 includes the following raw materials by mass:

[0039]

[0040] The preparation process of the Carbopol 912 is specifically as follows:

[0041] Turn on the heating jacket to raise the temperature and build a reflux device; pour 3 / 4 of isopropanol into the reaction kettle and raise the temperature to the reflux temperature of isopropanol, 85 ± 5 °C; mix all the propylene monomers and 3 / 4 of the peroxide initiator in advance and stir until dissolved, then turn on the stirring of the reaction kettle, and drop the propylene monomers dissolved with the initiator into the reaction kettle through a dropping funnel. After the dropping is completed in 2 hours, rinse the dropping funnel with the remaining 1 / 4 of isopropanol and add the rinsing liquid to the reaction kettle to continue the reaction; after heat preservation for 6 hours, add the remaining 1 / 4 of the initiator, and then heat preserve for 5 hours; then cool down to 45 °C, add sodium hydroxide and continue the reaction for 20 minutes, and then stop the reaction and discharge the material; precipitate and separate the miscible mixture with solvents with different solubilities, isopropanol, cyclohexane, methanol, methyl ethyl ketone, and water, and then centrifuge to separate the solvents. After drying the refined product, Carbopol 912 is obtained.

[0042] The pure water involved in the embodiments of the present invention is purified water with an electrical conductivity of 9.000s / cm.

[0043] Example 1

[0044] A method for preparing water-in-oil emulsified ink for stencil printing plate, wherein the raw materials of the emulsified ink include: oil phase: white substance oil, organic polymer pigment, emulsifier, alkyl modified polycarboxylate; water phase: pure water, sulfate, diethanol, disinfectant.

[0045] The emulsifiers include emulsifier G-01, emulsifier R-25 and emulsifier T-02.

[0046] Specifically:

[0047] The oil phase is as follows: 19kg mineral oil, 6.3kg benzimidazolone azo pigment of Dongguan Taiheng Pigment Co., Ltd., 6kg emulsifier S80, 4kg emulsifier S85, 12kg emulsifier T6, 0.5kg carbomer 912; the water phase is as follows: 0.02kg anhydrous magnesium sulfate, 7kg diethanol, 0.1kg kaison disinfectant, and the remainder is purified water.

[0048] The preparation method of emulsified ink is as follows: mineral oil, benzimidazolone azo pigment of Dongguan Taiheng Pigment Co., Ltd., emulsifier S80, emulsifier S85, and carbomer 912 are placed in a three-roller mill for grinding operation, and the grinding is repeated. During the grinding, the scraper fineness meter is used to detect to ensure that the scraped fineness is controlled at 5μm and below and does not exceed 2.5μm, until the fineness is qualified. Subsequently, the oil phase material that has passed the fineness test is mixed with the emulsifier T61 and the water phase material, and the mixture is stirred and emulsified. At the same time, the energy flow vacuum pump is turned on to make the vacuum degree 0.094MPa, and the residual water, other impurities and trace bubbles that are not wrapped and easy to cause demulsification in the material are removed, and finally the emulsified ink is obtained.

[0049] The emulsified ink prepared in Example 1 can be applied to the ink supply type required by the printing kit of the printing facility. The ink passes through the orifice of the ink cartridge nozzle, is rolled and developed via the transfer shaft, and is printed by filling the core with an oil-based water-in-oil ink. It is specifically suitable for printing on wide-width and large-area cardboard, paper, leather, and oil surfaces that are incompatible with other inks.

[0050] The emulsified ink prepared in Example 1 was frozen at -19.9°C for 10 weeks and the viscosity was detected to be 25cps (25°C). After being stored at 25°C for 10 weeks, the viscosity was measured to be 29cps (25°C). After being aged at 55°C for 10 weeks, the viscosity was measured to be 29cps.

[0051] When the invention is used, it has excellent developing property, and can be stored normally for one year under normal temperature, medium temperature and frozen conditions without oil or water. The key is that it is of good quality and low price, and can be smoothly inspected on a machine without missing prints or dripping.

[0052] Example 2

[0053] A method for preparing water-in-oil emulsified ink for stencil printing plate, wherein the raw materials of the emulsified ink include: oil phase: white substance oil, organic polymer pigment, emulsifier, alkyl modified polycarboxylate; water phase: pure water, sulfate, diethanol, disinfectant.

[0054] The emulsifiers include emulsifier G-01, emulsifier R-25 and emulsifier T-02.

[0055] Specifically:

[0056] The oil phase is as follows: 22kg mineral oil, 6.4kg benzimidazolone azo pigment of Dongguan Taiheng Pigment Co., Ltd., 5kg emulsifier S80, 2.2kg emulsifier S85, 12.5kg emulsifier T6, 20.2kg carbomer 91; the water phase is as follows: 0.02kg anhydrous magnesium sulfate, 10kg diethanol, 0.05kg kaison disinfectant, and the remainder is purified water.

[0057] The preparation method of emulsified ink is as follows: mineral oil, benzimidazolone azo pigment of Dongguan Taiheng Pigment Co., Ltd., emulsifier S80, emulsifier S85, and carbomer 912 are placed in a three-roller mill for grinding, and the grinding is repeated. During the grinding, the scraper fineness meter is used to detect to ensure that the scraped fineness is controlled at 5μm and below and does not exceed 2.5μm, until the fineness is qualified. Subsequently, the oil phase material that has passed the fineness test is mixed with the emulsifier T61 and the water phase material, and the mixture is stirred and emulsified. At the same time, the energy flow vacuum pump is turned on to make the vacuum degree 0.081MPa, and the residual water, other impurities and trace bubbles that are not wrapped and easy to cause demulsification in the material are removed, and finally the emulsified ink is obtained.

[0058] The emulsified ink prepared in Example 2 can be applied to the ink supply types required by the printing kits of printing facilities. The ink is developed by rolling through the orifice plate of the ink cartridge nozzle and the transfer shaft, and is printed by filling the core with an oil-based water-in-oil ink. It is specifically suitable for printing on wide-width and large-area cardboard, paper, leather, and oil surfaces that are incompatible with other inks.

[0059] The emulsified ink prepared in Example 2 was frozen at -19.9°C for 10 weeks and the viscosity was 22cps (25°C). After being stored at 25°C for 10 weeks, the viscosity was 22cps (25°C). After being aged at 55°C for 10 weeks, the viscosity was 23cps.

[0060] When the invention is used, it has excellent developing property, and can be stored normally for one year under normal temperature, medium temperature and frozen conditions without oil or water. The key is that it is of good quality and low price, and can be smoothly inspected on a machine without missing prints or dripping.

[0061] Example 3

[0062] A method for preparing water-in-oil emulsified ink for stencil printing plate, wherein the raw materials of the emulsified ink include: oil phase: white substance oil, organic polymer pigment, emulsifier, alkyl modified polycarboxylate; water phase: pure water, sulfate, diethanol, disinfectant.

[0063] The emulsifiers include emulsifier G-01, emulsifier R-25 and emulsifier T-02.

[0064] Specifically:

[0065] The oil phase is as follows: 27kg mineral oil, 4.2kg benzimidazolone azo pigment of Dongguan Taiheng Pigment Co., Ltd., 10.1kg emulsifier S80, 0.5kg emulsifier S85, 10.6kg emulsifier T6, 20.015kg carbomer 91; the water phase is as follows: 0.02kg anhydrous magnesium sulfate, 7kg diethanol, 0.08kg kaison disinfectant, and the remainder is purified water.

[0066] The preparation method of emulsified ink is as follows: mineral oil, benzimidazolone azo pigment of Dongguan Taiheng Pigment Co., Ltd., emulsifier S80, emulsifier S85, and carbomer 912 are placed in a three-roller mill for grinding, and the grinding is repeated. During the grinding, the scraper fineness meter is used to detect to ensure that the scraped fineness is controlled at 5μm and below and does not exceed 2.5μm, until the fineness is qualified. Subsequently, the oil phase material that has passed the fineness test is mixed with the emulsifier T61 and the water phase material, and the mixture is stirred and emulsified. At the same time, the energy flow vacuum pump is turned on to make the vacuum degree 0.090MPa, and the residual water, other impurities and trace bubbles that are not wrapped and easy to cause demulsification in the material are removed, and finally the emulsified ink is obtained.

[0067] The emulsified ink prepared in Example 3 can be applied to the ink supply types required by the printing kits of printing facilities. The ink passes through the orifice plate of the ink cartridge nozzle, is rolled and developed via the transfer shaft, and is printed by filling the core with an oil-based water-in-oil ink. It is specifically suitable for printing on wide-width and large-area cardboard, paper, leather, and oil surfaces that are incompatible with other inks.

[0068] The emulsified ink prepared in Example 3 was frozen at -19.9°C for 10 weeks and the viscosity was 28cps (25°C). After being stored at 25°C for 10 weeks, the viscosity was 25cps (25°C). After being aged at 55°C for 10 weeks, the viscosity was 26cps.

[0069] When the present invention is in use: it has excellent developability, and after being aged at normal temperature, medium temperature and frozen for one year, it can be stored normally without oil leakage or water leakage. The key is that it is of high quality and low price, and when tested on the machine, it is smooth without printing omission or dripping.

[0070] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a water-in-oil emulsion ink for stencil, characterized in that: The raw materials of the emulsified ink include: oil phase: white oil, organic polymer pigment, emulsifier, alkyl modified polycarboxylate; water phase: purified water, sulfate, diethanol, disinfectant; The preparation steps of the emulsified ink are as follows: the oil phase material and the water phase material are mixed, stirred and emulsified, and an energy flow vacuum pump is used to evacuate the impurities and trace bubbles to obtain the emulsified ink.

2. The method for preparing a water-in-oil emulsion ink for stencil according to claim 1, characterized in that: The emulsion ink comprises the following raw materials in percentage by mass: The oil phase comprises: 5-35% white oil, 4-8% organic polymer pigment, 0.5-13% emulsifier, and 0.01-0.5% alkyl modified polycarboxylate; The aqueous phase comprises: 50-70% pure water, 0.01-0.2% sulfate, 5%-10% diethanol, and less than 0.1% disinfectant; Wherein, the sulfate is anhydrous magnesium sulfate, the organic polymer pigment is an azo organic polymer pigment, and the alkyl-modified polycarboxylate is a carbomer oil-in-water thickener.

3. The method for preparing a water-in-oil emulsion ink for stencil according to claim 1 or 2, characterized in that: The white substance oil includes one or more of mineral oil, animal and plant fatty oil, alkyl acid alkyl isomeric alcohol, alkyl isopropyl butanone, and isomeric ether alcohol ester.

4. The method for preparing a water-in-oil emulsion ink for stencil according to claim 1, characterized in that: The organic polymer pigment is one or more of the azo organic polymer pigment of Anhui Jingzhicai New Materials Co., Ltd., the azo organic polymer pigment of Shuanghuan Pigment Co., Ltd., the azo organic polymer pigment of Dongguan Taiheng Pigment Co., Ltd., and the benzimidazolone azo pigment.

5. The method for preparing a water-in-oil emulsion ink for stencil according to claim 1, characterized in that: The emulsifiers include emulsifier G-01, emulsifier R-25 and emulsifier T-02; the emulsifier G-01 is a sorbitan ester emulsifier, and the HLB value of the emulsifier G-01 is 4-5; the emulsifier R-25 is a sorbitan ester emulsifier, and the HLB value of the emulsifier R-25 is 1-2; the emulsifier T-02 is a polyoxyethylene sorbitan ester emulsifier, and the HLB value of the emulsifier T-02 is 9-11; the mass ratio of the emulsifier G-01, emulsifier R-25 and emulsifier T-02 is (4-12): (0-8): (0.5-2.5).

6. The method for preparing a water-in-oil emulsion ink for stencil printing plate according to claim 1, characterized in that the alkyl-modified polycarboxylate is Carbomer 912; The Carbomer 912 comprises the following raw materials in percentage by mass: The preparation process of Carbomer 912 is as follows: Turn on the heating jacket to increase the temperature and build a reflux device; pour 3 / 4 of isopropanol into the reactor and heat it to the reflux temperature of isopropanol 80-90°C; mix all the propylene monomers and 3 / 4 of the peroxide initiator in advance and stir until dissolved, then turn on the reactor to stir, and drip the propylene monomer dissolved in the initiator into the reactor through a dropping funnel. After the dripping is completed in 1-3 hours, rinse the dropping funnel with the remaining 1 / 4 of isopropanol, and add the rinse liquid into the reactor to continue the reaction; after keeping warm for 6 hours, add the remaining 1 / 4 of the initiator and keep warm for another 5 hours; then cool to 45°C, add sodium hydroxide and continue the reaction for 20 minutes, then stop the reaction and discharge the material; precipitate and separate the miscible material with solvents of different solubility, such as isopropanol, cyclohexane, methanol, butanone and water, and then separate the solvent by centrifugation, and dry the refined material to obtain Carbomer 912.

7. The method for preparing a water-in-oil emulsion ink for stencil according to claim 1, characterized in that: The pure water includes one or more of ozone water with a conductivity below 10us / cm, adsorption water, purified water, filtered water and tap water.

8. The method for preparing a water-in-oil emulsion ink for stencil according to claim 1, characterized in that: The pesticide includes one or more of isothiazolinone pesticides, anthraquinone pesticides, and chlorfluthrin pesticides; preferably, the pesticide is an isothiazolinone pesticide; further, the pesticide is a kaison pesticide.

9. The emulsified ink prepared by the preparation method described in any one of claims 1 to 8 is used in a printing kit of a printing facility. The ink passes through the orifice plate of the ink cartridge nozzle, is rolled and developed via a transfer shaft, and is printed by filling a core with an oil-in-water ink. The ink is specifically suitable for printing on cardboard, paper, leather, and oil surfaces that are incompatible with other inks.

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