Quick-drying high-stability printing ink for silk-screen printing and preparation method of quick-drying high-stability printing ink

Abstract

The invention discloses quick-drying high-stability printing ink for silk-screen printing and a preparation method, and the quick-drying high-stability printing ink comprises the following components in parts by weight: 30-50 parts of a resin base material, 10-25 parts of a pigment, 20-40 parts of a quick-drying solvent, 2-8 parts of a stabilizer, 1-5 parts of an auxiliary agent, 15-35 parts of titanium dioxide and 3-8 parts of a hindered phenol antioxidant. The quick-drying ink contains quick-drying solvents such as ethanol, isopropanol or ethyl acetate, the solvents have lower boiling points and good volatility, and the solvents can be quickly volatilized in the silk-screen process, so that the ink is quickly dried to form a film, and the drying time of a printed matter is greatly shortened; the stability of the ink can be further enhanced through the stabilizer, the antioxidant can prevent components in the ink from being oxidized, and the service life of the ink is prolonged; through mutual cooperation of the curing agent and the curing accelerator benzyl dimethylamine, the curing reaction of the ink can be accelerated, and a cured ink film has relatively high hardness, wear resistance and chemical resistance, so that a printed pattern is more firmly attached to a printing base material.

Description

Technical Field

[0001] The present invention belongs to the technical field of quick-drying inks, and particularly relates to a quick-drying and highly stable ink for screen printing and a preparation method thereof. Background Art

[0002] Ink is an important material for printing. It shows patterns and words on a printing substrate through printing or spraying. Ink includes main components and auxiliary components, which are evenly mixed and repeatedly rolled into a viscous colloidal fluid, composed of a binder (resin), pigments, fillers, additives, solvents, etc., and is used for various printing such as books, packaging and decoration, architectural decoration, and electronic circuit boards. With the increasing social demand, the variety and output of inks have also expanded and grown accordingly.

[0003] In the prior art, most screen printing inks usually lack such highly efficient quick-drying solvents, resulting in extremely slow drying of the ink. In actual production, printed products need to wait for a long time to dry. For example, in the packaging printing industry, from printing a product to entering the next process, it often takes several hours or even longer. This not only seriously reduces production efficiency but also significantly increases the idle time of equipment, causing waste of resources. Moreover, during the waiting for drying, since the ink is not cured in time, printed products are prone to sticking to each other. Once stuck, manual separation is required, which not only consumes manpower but also easily damages the printed products. In addition, the uncured ink may also flow and spread, resulting in blurred patterns, greatly affecting product quality and making it difficult to meet the requirements of large-scale industrial production for printing efficiency and quality.

[0004] Therefore, we propose a quick-drying and highly stable ink for screen printing and a preparation method thereof to solve the problems mentioned in the above background art. Summary of the Invention

[0005] The purpose of the present invention is to provide a quick-drying and highly stable ink for screen printing and a preparation method thereof to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A quick-drying and highly stable ink for screen printing, by weight, includes: 30 - 50 parts of a resin base material, 10 - 25 parts of pigments, 20 - 40 parts of a quick-drying solvent, 2 - 8 parts of a stabilizer, 1 - 5 parts of additives, 3 - 8 parts of a hindered phenol antioxidant, 2 - 10 parts of an organosilicon leveling agent, 3 - 8 parts of a curing agent, 1 - 5 parts of a curing accelerator, 1 - 6 parts of a waterproofing agent, 5 - 10 parts of glycerol ester, and the balance is titanium dioxide.

[0007] Preferably, by weight, it includes: 40 parts of resin base material, 15 parts of pigment, 30 parts of quick-drying solvent, 6 parts of stabilizer, 4 parts of auxiliary agent, 20 parts of titanium dioxide, 6 parts of hindered phenol antioxidant, 8 parts of silicone leveling agent, 6 parts of curing agent, 3 parts of curing accelerator, 4 parts of waterproof agent, and 7 parts of glyceride.

[0008] Preferably, the quick-drying solvent is one of ethanol, isopropanol or ethyl acetate.

[0009] Preferably, the stabilizer is one of antioxidant, anti-settling agent or dispersant.

[0010] Preferably, the auxiliary agent is one of leveling agent, defoaming agent, thickening agent, silicone leveling agent, polyether defoaming agent or cellulose thickening agent.

[0011] Preferably, the curing agent is one of ethylenediamine, polyamide, methyltetrahydrophthalic anhydride.

[0012] Preferably, the curing accelerator is benzyldimethylamine.

[0013] Preferably, the resin base material is at least one of acrylic resin and polyurethane resin.

[0014] The present invention also provides a method for preparing a quick-drying and highly stable ink for screen printing, which specifically includes the following steps:

[0015] S1. Add the weighed resin base material to a high-speed disperser, start low-speed stirring, control the rotation speed at 100 - 300 r / min. During the stirring process, slowly add the pigment, titanium dioxide and stabilizer, and continuously stir for 30 - 60 minutes to preliminarily disperse the pigment and titanium dioxide evenly in the resin base material to form a uniform slurry, ensuring the preliminary mixing of each component and reducing the agglomeration phenomenon;

[0016] S2. Transfer the preliminarily dispersed slurry to a grinding device, add an appropriate amount of grinding medium, and the filling amount of the grinding medium is 50% - 70% of the volume of the grinding device. Start the grinding device, control the grinding speed at 1500 - 3000 r / min, and the grinding time is 2 - 4 hours until the fineness of the slurry reaches 10 - 20 μm, ensuring that the particles such as pigment and titanium dioxide are fully refined and evenly dispersed, and improving the stability and printing quality of the ink;

[0017] S3. Transfer the ground slurry back to the high-speed disperser, start stirring, adjust the rotation speed to 200 - 500 r / min, and sequentially add the quick-drying solvent, hindered phenol antioxidant, silicone leveling agent, curing agent, curing accelerator, waterproof agent, glyceride and auxiliary agent, and continuously stir for 30 - 60 minutes to fully mix each component evenly;

[0018] S4. Filter the uniformly mixed ink through a filter screen with a mesh size of 200 - 400 meshes to remove impurities and undispersed particles in the ink. The filtered ink is filled into a sealed container for packaging. During the packaging process, try to avoid long-term contact between the ink and air to prevent ink oxidation and solvent volatilization, which may affect the performance of the ink.

[0019] Preferably, in step S3, the grinding equipment is a sand mill, and the grinding medium is at least one of glass beads or zirconia beads.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] (1). It contains fast-drying solvents such as ethanol, isopropanol or ethyl acetate. These solvents have low boiling points and good volatility. During the screen printing process, the solvents can quickly volatilize, enabling the ink to dry into a film rapidly, greatly shortening the drying time of the printed matter. This not only improves production efficiency, reduces the time waste caused by waiting for the ink to dry, but also avoids problems such as mutual adhesion of printed matters and blurred patterns caused by slow drying of the ink, and is suitable for the rapid printing requirements of large-scale industrial production.

[0022] (2). The stability of the ink can be further enhanced through stabilizers (antioxidants, anti-settling agents or dispersants). Antioxidants can prevent the components in the ink from being oxidized and extend the service life of the ink; anti-settling agents can prevent pigments and fillers from settling and maintain the suspension state of the ink; dispersants help pigments and titanium dioxide, etc. to be evenly dispersed in the system, avoiding stratification and flocculation phenomena. Hindered phenol antioxidants can also effectively inhibit the oxidation reaction of the ink during storage and use, ensuring the stable performance of the ink.

[0023] (3). Through the cooperation of curing agents (ethylenediamine, polyamide, methyltetrahydrophthalic anhydride, etc.) and the curing accelerator benzyl dimethylamine, the curing reaction of the ink can be accelerated. The cured ink film has high hardness, wear resistance and chemical resistance, enabling the printed pattern to adhere more firmly to the printing substrate, not being easily scratched, worn or eroded by chemical substances, and extending the service life of the printed matter. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] The invention provides a quick-drying and highly stable ink for silk screen printing, which comprises, by weight, 30-50 parts of a resin base material, 10-25 parts of a pigment, 20-40 parts of a quick-drying solvent, 2-8 parts of a stabilizer, 1-5 parts of an auxiliary agent, 15-35 parts of titanium dioxide, 3-8 parts of a hindered phenol antioxidant, 2-10 parts of an organosilicon leveling agent, 3-8 parts of a curing agent, 1-5 parts of a curing accelerator, 1-6 parts of a waterproofing agent, and 5-10 parts of a glyceride.

[0026] Measured by weight, it includes: 40 parts of resin base material, 15 parts of pigment, 30 parts of quick-drying solvent, 6 parts of stabilizer, 4 parts of additive, 20 parts of titanium dioxide, 6 parts of hindered phenol antioxidant, 8 parts of organosilicon leveling agent, 6 parts of curing agent, 3 parts of curing accelerator, 4 parts of waterproofing agent and 7 parts of glyceride.

[0027] Resin base material: As the core film-forming substance of ink, it provides basic adhesion and film-forming properties for ink. At least one of acrylic resin and polyurethane resin can be selected. Different types of resin base materials give ink different properties. For example, acrylic resin can make the ink have good weather resistance and glossiness, while polyurethane resin gives the ink excellent wear resistance and flexibility, ensuring that the ink can meet the needs in different printing scenarios.

[0028] Pigment: The choice of pigment determines the color presentation of the ink. The rich and diverse types of pigments provide a wide color gamut for the ink. Whether it is bright and vivid colors or deep and steady tones, they can be accurately mixed. These pigments have been carefully screened and processed, and have the characteristics of high purity and high tinting strength, which can ensure that the printed pattern is full of color, clear and realistic.

[0029] Quick-drying solvent: Quick-drying solvent is the key to achieving quick drying of ink. It uses one of ethanol, isopropanol or ethyl acetate. These solvents have a low boiling point and high volatility. After screen printing is completed, the solvent evaporates quickly, allowing the ink to quickly solidify into a film, greatly shortening the drying time of the printed product, significantly improving production efficiency, and meeting the modern printing industry's demand for efficient production.

[0030] Stabilizer: You can choose from antioxidants, anti-settling agents or dispersants. Antioxidants can effectively delay the oxidation process of components in the ink and extend the shelf life of the ink; anti-settling agents prevent pigments and fillers from settling during the storage of the ink to ensure the uniformity of the ink; dispersants help pigments and titanium dioxide to be evenly dispersed in the system to avoid agglomeration, maintain the stability of the ink, and ensure that the performance of the ink remains consistent during long-term storage and use.

[0031] Auxiliary agents: Selected from leveling agents, defoamers, thickeners, silicone leveling agents, polyether defoamers or cellulose thickeners. Among them, leveling agents and silicone leveling agents can reduce the surface tension of the ink, enabling the ink to spread evenly during printing, forming a smooth and flat ink film, and improving the appearance quality of printed products; defoamers can eliminate the bubbles generated during the stirring and printing processes of the ink, preventing the bubbles from affecting the clarity and integrity of the printed pattern; thickeners and cellulose thickeners are used to adjust the viscosity of the ink, ensuring that the ink has good fluidity and transferability during screen printing, and avoiding problems such as missing printing and plate smudging.

[0032] Titanium dioxide: Titanium dioxide is an indispensable component in the ink. It has extremely high whiteness and covering power. Adding titanium dioxide to the ink can not only enhance the covering performance of the ink, enabling the printed pattern to be clearly presented on different backgrounds, but also improve the whiteness and brightness of the ink, making the colors of printed products more vivid and lively. At the same time, it also has a certain improvement effect on the weather resistance of the ink.

[0033] Hindered phenol antioxidants: By capturing free radicals, they can effectively inhibit the oxidation reaction of the ink during storage and use, preventing the ink from discoloring and deteriorating due to oxidation, and further ensuring the stability and service life of the ink.

[0034] Silicone leveling agent: It can significantly improve the leveling performance of the ink. During printing, it promotes the uniform distribution of the ink on the surface of the printing substrate, forming an ink film with a consistent thickness, avoiding defects such as flow marks and orange peel, making the printed pattern more delicate and exquisite, and greatly improving the quality of printed products.

[0035] Curing agent: One of ethylenediamine, polyamide, and methyltetrahydrophthalic anhydride can be selected. The curing agent plays a key role in the drying process of the ink. It undergoes a chemical reaction with the resin base material to form a cross-linked structure, making the ink film have higher hardness, wear resistance, and chemical resistance, enhancing the adhesion between the printed pattern and the printing substrate, and ensuring that the printed pattern is firm and long-lasting.

[0036] Curing accelerator: The curing accelerator benzyl dimethylamine can accelerate the reaction rate between the curing agent and the resin base material, shorten the curing time of the ink, improve production efficiency. At the same time, it can also make the curing reaction more complete, further enhancing the performance of the ink film and ensuring the stable and reliable quality of printed products.

[0037] Waterproof agent: The waterproof agent endows the ink with excellent waterproof performance. When the printed product comes into contact with water or is in a humid environment, the waterproof agent forms a dense waterproof protective film on the surface of the ink, preventing water penetration, preventing the ink from dissolving and bleeding, ensuring the integrity and clarity of the printed pattern, and expanding the application fields of the ink, making it applicable to scenarios with high waterproof requirements such as outdoor advertising and packaging printing.

[0038] Glycerides: mainly play the roles of plasticization and lubrication. It can increase the flexibility of the ink, prevent the ink film from becoming brittle and cracking after drying, and at the same time improve the fluidity of the ink, making the ink pass through the screen more smoothly during printing, improving the printing accuracy and efficiency, and ensuring the smooth progress of the printing process.

[0039] The present invention also provides a method for preparing a fast-drying and highly stable screen printing ink, which specifically includes the following steps:

[0040] S1. Add the weighed resin base material into a high-speed disperser, start low-speed stirring, control the rotation speed at 100 - 300 r / min. During the stirring process, slowly add pigments, titanium dioxide, and stabilizers, and continuously stir for 30 - 60 minutes to preliminarily disperse the pigments and titanium dioxide evenly in the resin base material, forming a uniform slurry, ensuring the preliminary mixing of each component and reducing the agglomeration phenomenon;

[0041] S2. Transfer the pre-dispersed slurry to a grinding device, add an appropriate amount of grinding medium, and the filling amount of the grinding medium is 50% - 70% of the volume of the grinding device. Start the grinding device, control the grinding speed at 1500 - 3000 r / min, and the grinding time is 2 - 4 hours until the fineness of the slurry reaches 10 - 20 μm, ensuring that the particles such as pigments and titanium dioxide are fully refined and evenly dispersed, improving the stability and printing quality of the ink;

[0042] S3. Transfer the ground slurry back to the high-speed disperser, start stirring, adjust the rotation speed to 200 - 500 r / min, and sequentially add a fast-drying solvent, a hindered phenol antioxidant, an organosilicon leveling agent, a curing agent, a curing accelerator, a waterproofing agent, glycerides, and additives, and continuously stir for 30 - 60 minutes to fully mix each component evenly;

[0043] S4. Filter the evenly mixed ink through a filter screen with a mesh number of 200 - 400 meshes to remove impurities and undispersed particles in the ink. The filtered ink is filled into a sealed container for packaging. During the packaging process, try to avoid the ink from contacting with air for a long time to prevent the ink from oxidizing and the solvent from volatilizing, which may affect the performance of the ink.

[0044] Example 1

[0045] Ink formula

[0046] By weight, each component is as follows:

[0047] Resin base material: 30 parts (acrylic resin is selected), pigment: 10 parts (blue pigment), quick-drying solvent: 20 parts (ethanol), stabilizer: 2 parts (antioxidant), auxiliary agent: 1 part (leveling agent), titanium dioxide: 15 parts, hindered phenol antioxidant: 3 parts, silicone leveling agent: 2 parts, curing agent: 3 parts (ethylenediamine), curing accelerator: 1 part (benzyl dimethylamine), waterproofing agent: 1 part, glyceride: 5 parts.

[0048] Manufacturing method

[0049] S1: Preliminary dispersion

[0050] Add the weighed 30 parts of acrylic resin into a high-speed disperser, turn on the low-speed stirring, and control the rotation speed at 100 r / min. During the stirring process, slowly add 10 parts of blue pigment, 15 parts of titanium dioxide and 2 parts of antioxidant, and continuously stir for 60 minutes to preliminarily disperse the pigment and titanium dioxide evenly in the resin base material, forming a uniform slurry and reducing the agglomeration phenomenon.

[0051] S2: Grinding and refinement

[0052] Transfer the pre-dispersed slurry to a sand mill, add glass beads as the grinding medium, and the filling amount of the grinding medium is 50% of the volume of the sand mill. Turn on the grinding equipment, control the grinding speed at 1500 r / min, and the grinding time is 4 hours until the fineness of the slurry reaches 10 μm, ensuring that the particles such as pigment and titanium dioxide are fully refined and evenly dispersed, and improving the stability and printing quality of the ink.

[0053] S3: Mix other components

[0054] Transfer the ground slurry back to the high-speed disperser, turn on the stirring, and adjust the rotation speed to 200 r / min. Add 20 parts of ethanol, 3 parts of hindered phenol antioxidant, 2 parts of silicone leveling agent, 3 parts of ethylenediamine, 1 part of benzyl dimethylamine, 1 part of waterproofing agent, 5 parts of glyceride and 1 part of leveling agent in sequence, and continuously stir for 60 minutes to make all components fully mixed evenly.

[0055] S4: Filtration and packaging

[0056] Filter the uniformly mixed ink through a 200-mesh filter screen to remove impurities and undispersed particles in the ink. The filtered ink is filled into a sealed container for packaging, and try to avoid the ink contacting with air for a long time during the packaging process to prevent the ink from oxidizing and the solvent from volatilizing, which will affect the performance of the ink.

[0057] Example two

[0058] Ink formula

[0059] By weight, the components are as follows:

[0060] Resin base: 40 parts (polyurethane resin), pigment: 15 parts (red pigment), quick-drying solvent: 30 parts (isopropyl alcohol), stabilizer: 6 parts (anti-settling agent), auxiliary agent: 4 parts (defoamer), titanium dioxide: 20 parts, hindered phenol antioxidant: 6 parts, silicone leveling agent: 8 parts, curing agent: 6 parts (polyamide), curing accelerator: 3 parts (benzyl dimethylamine), waterproofing agent: 4 parts, glyceride: 7 parts.

[0061] Manufacturing method

[0062] S1: Preliminary dispersion

[0063] Add the weighed 40 parts of polyurethane resin to a high-speed disperser, start low-speed stirring, and control the rotation speed at 200 r / min. During stirring, slowly add 15 parts of red pigment, 20 parts of titanium dioxide, and 6 parts of anti-settling agent, and continue stirring for 45 minutes to preliminarily disperse the pigment and titanium dioxide evenly in the resin base, forming a uniform slurry and reducing the agglomeration phenomenon.

[0064] S2: Grinding and refinement

[0065] Transfer the pre-dispersed slurry to a sand mill, add zirconia beads as the grinding medium, and the filling amount of the grinding medium is 60% of the volume of the sand mill. Start the grinding equipment, control the grinding speed at 2200 r / min, and the grinding time is 3 hours until the fineness of the slurry reaches 15 μm, ensuring that the particles such as pigment and titanium dioxide are fully refined and dispersed evenly, improving the stability and printing quality of the ink.

[0066] S3: Mixing other components

[0067] Transfer the ground slurry back to the high-speed disperser, start stirring, and adjust the rotation speed to 350 r / min. Add 30 parts of isopropyl alcohol, 6 parts of hindered phenol antioxidant, 8 parts of silicone leveling agent, 6 parts of polyamide, 3 parts of benzyl dimethylamine, 4 parts of waterproofing agent, 7 parts of glyceride, and 4 parts of defoamer in sequence, and continue stirring for 45 minutes to fully mix all components evenly.

[0068] S4: Filtration and packaging

[0069] Filter the well-mixed ink through a 300-mesh filter screen to remove impurities and undispersed particles in the ink. The filtered ink is filled into a sealed container for packaging, and try to avoid the ink contacting with air for a long time during the packaging process to prevent the ink from oxidizing and the solvent from volatilizing, which may affect the performance of the ink.

[0070] Example 3

[0071] Ink formula

[0072] By weight, the components are as follows:

[0073] Resin base: 50 parts (acrylic resin and polyurethane resin are mixed in a ratio of 1:1), pigment: 25 parts (yellow pigment), quick-drying solvent: 40 parts (ethyl acetate), stabilizer: 8 parts (dispersant), additive: 5 parts (thickener), titanium dioxide: 35 parts, hindered phenol antioxidant: 8 parts, silicone leveling agent: 10 parts, curing agent: 8 parts (methyltetrahydrophthalic anhydride), curing accelerator: 5 parts (benzyldimethylamine), waterproofing agent: 6 parts, glyceride: 10 parts.

[0074] Manufacturing method

[0075] S1: Preliminary dispersion

[0076] Add the weighed 50 parts of acrylic resin and polyurethane resin (mixed in a ratio of 1:1) into a high-speed disperser, turn on the low-speed stirring, and control the rotation speed at 300 r / min. During the stirring process, slowly add 25 parts of yellow pigment, 35 parts of titanium dioxide, and 8 parts of dispersant, and continue stirring for 30 minutes to preliminarily disperse the pigment and titanium dioxide evenly in the resin base to form a uniform slurry and reduce the agglomeration phenomenon.

[0077] S2: Grinding and refinement

[0078] Transfer the pre-dispersed slurry to a sand mill, add a mixture of glass beads and zirconia beads as the grinding medium, and the filling amount of the grinding medium is 70% of the volume of the sand mill. Turn on the grinding equipment, control the grinding speed at 3000 r / min, and the grinding time is 2 hours until the fineness of the slurry reaches 20 μm to ensure that the particles such as pigment and titanium dioxide are fully refined and evenly dispersed, and improve the stability and printing quality of the ink.

[0079] S3: Mix other components

[0080] Transfer the ground slurry back to the high-speed disperser, turn on the stirring, and adjust the rotation speed to 500 r / min. Add 40 parts of ethyl acetate, 8 parts of hindered phenol antioxidant, 10 parts of silicone leveling agent, 8 parts of methyltetrahydrophthalic anhydride, 5 parts of benzyldimethylamine, 6 parts of waterproofing agent, 10 parts of glyceride, and 5 parts of thickener in sequence, and continue stirring for 30 minutes to make all components fully mixed evenly.

[0081] S4: Filtration and packaging

[0082] Filter the evenly mixed ink through a 400-mesh filter screen to remove impurities and undispersed particles in the ink. The filtered ink is filled into a sealed container for packaging, and try to avoid the ink contacting with air for a long time during the packaging process to prevent the ink from oxidizing and the solvent from volatilizing, which will affect the performance of the ink.

[0083] Comparative example 1: Do not add quick-drying solvent, stabilizer and curing agent, and other raw materials and preparation steps are the same as those in Examples 1-3.

[0084]

[0085]

[0086] Drying time analysis

[0087] Examples 1 - 3 are basically dried within 5 - 10 minutes in a normal environment by virtue of the fast - drying solvent, which greatly improves production efficiency. In Comparative Example 1, the fast - drying solvent is lacking, the drying time exceeds 30 minutes and the surface is sticky, failing to meet the production requirements. The rapid - volatilization characteristic of the fast - drying solvent is the key to achieving rapid ink drying, which can effectively reduce the waiting time for the printed matter to dry and avoid problems such as mutual adhesion of the printed matter due to slow drying.

[0088] Stability analysis

[0089] The stabilizer added in the examples enables the ink to remain in good condition after 3 months of storage, without stratification or precipitation, and the pigment is evenly dispersed. In Comparative Example 1, due to the lack of stabilizer, obvious stratification occurs only after 1 week of storage, and the pigment precipitates, indicating that the stabilizer is crucial for maintaining the uniformity and stability of the ink. It can prevent pigment sedimentation and agglomeration, ensure the stable performance of the ink during storage and use, and guarantee the consistency of the printing effect each time.

[0090] Printed pattern clarity analysis

[0091] The ink in the examples is clear in pattern, sharp in lines, and full in color during printing. This benefits from the reasonable formulation design, and the components work together to enable the ink to spread and transfer evenly during printing. In Comparative Example 1, due to the lack of key components, the printed pattern is blurred, the edges are uneven, the color is uneven, and there is pigment accumulation and missing printing, seriously affecting the printing quality. It shows that the components work together to ensure the accurate presentation of the pattern by the ink during printing and achieve high - quality printing.

[0092] Curing degree analysis

[0093] The curing agent and curing accelerator in the examples enable the ink to form a film with high hardness and good wear resistance after curing, and there are no obvious marks when gently scratched with a fingernail. In Comparative Example 1, the curing agent is not added, the ink hardly cures, and there are scratches and it is easy to fall off when gently scratched with a fingernail. The curing agent and curing accelerator are crucial for the ink to form a firm and durable film, which can enhance the adhesion of the ink to the printing substrate and improve the service life of the printed matter.

[0094] Waterproof performance analysis

[0095] The waterproofing agent added in the example makes the printed matter remain unchanged after being soaked in water for 30 minutes, and the ink does not dissolve or bleed. In Comparative Example 1, the waterproofing agent is missing, and the pattern becomes blurred after being soaked for 5 minutes, and the ink dissolves and bleeds. The waterproofing agent can form a waterproof protective film on the surface of the ink, effectively preventing water erosion, broadening the application range of the ink, and making it applicable to scenarios with waterproof requirements.

[0096] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A quick-drying and highly stable ink for screen printing, characterized in that: Calculated by weight, it includes: 30-50 parts of resin base material, 10-25 parts of pigment, 20-40 parts of quick-drying solvent, 2-8 parts of stabilizer, 1-5 parts of additive, 15-35 parts of titanium dioxide, 3-8 parts of hindered phenol antioxidant, 2-10 parts of organosilicon leveling agent, 3-8 parts of curing agent, 1-5 parts of curing accelerator, 1-6 parts of waterproofing agent and 5-10 parts of glyceride.

2. The quick-drying and highly stable ink for screen printing according to claim 1, characterized in that: Measured by weight, it includes: 40 parts of resin base material, 15 parts of pigment, 30 parts of quick-drying solvent, 6 parts of stabilizer, 4 parts of additive, 20 parts of titanium dioxide, 6 parts of hindered phenol antioxidant, 8 parts of organosilicon leveling agent, 6 parts of curing agent, 3 parts of curing accelerator, 4 parts of waterproofing agent and 7 parts of glyceride.

3. The quick-drying and highly stable ink for screen printing according to claim 1, characterized in that: The quick-drying solvent is one of ethanol, isopropanol or ethyl acetate.

4. The quick-drying and highly stable ink for screen printing according to claim 1, characterized in that: The stabilizer is one of an antioxidant, an anti-settling agent or a dispersant.

5. The quick-drying and highly stable ink for screen printing according to claim 1, characterized in that: The auxiliary agent is one of a leveling agent, a defoaming agent, a thickener, an organic silicon leveling agent, a polyether defoaming agent or a cellulose thickener.

6. The quick-drying and highly stable ink for screen printing according to claim 1, characterized in that: The curing agent is one of ethylenediamine, polyamide and methyltetrahydrophthalic anhydride.

7. The quick-drying and highly stable ink for screen printing according to claim 1, characterized in that: The curing accelerator is benzyl dimethylamine.

8. The quick-drying and highly stable ink for screen printing according to claim 1, characterized in that: The resin base material is at least one of acrylic resin and polyurethane resin.

9. A method for preparing the quick-drying and highly stable ink for screen printing according to any one of claims 1 to 8, characterized in that: The specific steps include: S1. Add the weighed resin base material into a high-speed disperser, start low-speed stirring, and control the speed at 100-300r / min. During the stirring process, slowly add pigment, titanium dioxide and stabilizer, and continue stirring for 30-60 minutes to make the pigment and titanium dioxide preliminarily dispersed evenly in the resin base material to form a uniform slurry, ensure the initial mixing of each component, and reduce agglomeration; S2. Transfer the pre-dispersed slurry to the grinding equipment, add an appropriate amount of grinding media, the filling amount of the grinding media is 50%-70% of the volume of the grinding equipment, turn on the grinding equipment, control the grinding speed at 1500-3000r / min, and the grinding time is 2-4 hours until the fineness of the slurry reaches 10-20μm, ensuring that the particles of pigments and titanium dioxide are fully refined and evenly dispersed, thereby improving the stability of the ink and the printing quality; S3, transfer the ground slurry back to the high-speed disperser, start stirring, adjust the speed to 200-500r / min, add quick-drying solvent, hindered phenol antioxidant, silicone leveling agent, curing agent, curing accelerator, waterproofing agent, glyceride and additives in sequence, and continue stirring for 30-60 minutes to fully mix the ingredients; S4. Filter the mixed ink through a filter with a mesh size of 200-400 to remove impurities and undispersed particles in the ink. The filtered ink is placed in a sealed container for packaging. During the packaging process, try to avoid long-term contact between the ink and the air to prevent ink oxidation and solvent volatilization, which will affect the performance of the ink.

10. The method for preparing a quick-drying and highly stable ink for screen printing according to claim 9, characterized in that: In step S3, the grinding device is a sand mill, and the grinding medium is at least one of glass beads or zirconia beads.

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