Durable wear-resistant offset printing ink and preparation method thereof

Abstract

The invention discloses durable wear-resistant offset printing ink and a preparation method thereof, and relates to the technical field of offset printing. The durable wear-resistant offset printing ink is at least prepared from the following raw materials in parts by weight: 30 to 45 parts of jatropha curcas oil-based polyurethane acrylate, 4 to 8 parts of vinyl silicon dioxide, 15 to 25 parts of epoxidized soybean oil acrylate, 10 to 18 parts of soybean methyl oleate, 12 to 18 parts of pigment, 2 to 4 parts of fusible polytetrafluoroethylene micro powder, 1.5 to 3 parts of drying agent and 3 to 5 parts of auxiliary agent. The prepared durable wear-resistant offset printing ink is low in VOCs emission, good in wear resistance, high in durability and capable of being attached to various base materials.

Description

Technical Field

[0001] The invention relates to the technical field of offset printing, and in particular to a durable and wear-resistant offset printing ink and a preparation method thereof. Background Art

[0002] Offset ink, also known as offset printing ink, refers to the ink used in the offset printing process. Offset inks typically exhibit good fluidity, water resistance, rub resistance, and abrasion resistance, making them widely used in textile printing, packaging printing, advertising, and publishing. A wide variety of offset inks are available. Depending on the substrate and preparation method, offset inks can be categorized as synthetic paper inks, resin inks, glossy inks, and UV offset inks. Based on the drying method, they can be divided into heatset and penetration-drying offset inks. Different types of offset inks have varying properties and uses. Thanks to the growing awareness of environmental protection, the market share of environmentally friendly offset inks in my country has increased. Environmentally friendly offset inks are typically made from water-based and bio-based inks, producing fewer harmful substances during the preparation process and minimizing environmental impact. Currently, the mainstream environmentally friendly offset inks in my country include aromatic-free offset inks, vegetable oil-based offset inks, and waterless offset inks.

[0003] The main components of ink are binders and pigments. The binder is the most important component of ink, dispersing the pigment throughout the ink and imparting properties such as fluidity, drying properties, and viscosity. Traditional offset ink binders are based on mineral oil, which releases VOCs and contributes to environmental pollution. To mitigate the impact of the oil crisis and reduce environmental pollution, the use of environmentally friendly binders instead of mineral oil binders to produce environmentally friendly inks has become a new development trend. Eco-friendly inks include water-based inks, UV inks, and plant-based inks. Plant-based inks offer advantages such as low cost, good oil solubility, and stable performance. The most commonly used plant oil in plant-based inks is soybean oil. Soybean oil is a renewable resource, cheaper than other vegetable oils, and has high yields. After decomposition, it fully integrates into the natural environment, resulting in excellent environmental performance. However, soybean oil has poor drying properties, resulting in poor performance when used as a binder, which in turn affects the ink's performance. Current plant-based offset inks still require improvement in drying properties, rub resistance, and durability. Summary of the Invention

[0004] The purpose of the present invention is to provide a durable and wear-resistant offset printing ink and a preparation method thereof, so as to solve the following technical problems:

[0005] Existing offset printing inks have problems such as poor durability, abrasion resistance and poor adhesion.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A durable and wear-resistant offset printing ink, comprising at least the following raw materials in parts by weight:

[0008] 30-45 parts of tung oil-based polyurethane acrylate, 4-8 parts of vinyl silica, 15-25 parts of epoxy soybean oil acrylate, 10-18 parts of methyl soybean oleate, 12-18 parts of pigment, 2-4 parts of fusible polytetrafluoroethylene powder, 1.5-3 parts of desiccant, and 3-5 parts of additives.

[0009] As a further embodiment of the present invention, the preparation method of the Jatropha curcas oil-based polyurethane acrylate comprises at least the following steps:

[0010] Isophorone diisocyanate and hydroxyethyl acrylate are mixed, dibutyltin laurate is added as a catalyst, and a prepolymer is obtained after reaction;

[0011] Jatropha curcas oil-based polyol is added to the prepolymer to obtain jatropha curcas oil-based polyurethane acrylate after reaction.

[0012] As a further embodiment of the present invention, the mass ratio of the isophorone diisocyanate, the hydroxyethyl acrylate and the jatropha curcas oil-based polyol is 5-8:3-5:10-15.

[0013] As a further embodiment of the present invention: the preparation method of the vinyl silica comprises the following steps:

[0014] The nano-silica is dispersed in anhydrous ethanol, and vinyl silane coupling agent hydrolyzate is added, and the pH is adjusted to 10-11. After reaction, washing, drying and grinding, vinyl silica is obtained.

[0015] As a further embodiment of the present invention: the vinyl silane coupling agent is one or more of vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tri-tert-butyloxysilane, vinyl tri-tert-butyl peroxysilane and vinyl triacetoxysilane, and the mass ratio of the vinyl silane coupling agent to the nano-silica is 1:10-20.

[0016] As a further solution of the present invention: the auxiliary agent is one or a mixture of defoaming agent, leveling agent, dispersant, matting agent, UV active diluent, photoinitiator or polymerization inhibitor.

[0017] As a further embodiment of the present invention, the desiccant is one or a mixture of cobalt isooctanoate, manganese isooctanoate, cerium isooctanoate, iron isooctanoate, cobalt naphthenate or manganese naphthenate.

[0018] As a further solution of the present invention: the pigment is one or a mixture of magenta, phthalocyanine blue B, benzidine yellow or carbon black.

[0019] A method for preparing a durable and wear-resistant offset printing ink comprises at least the following steps:

[0020] Mixing vinyl silica, fusible polytetrafluoroethylene powder and methyl soybean oleate in an amount of 5-20% of the total amount of methyl soybean oleate to obtain a first slurry;

[0021] The tung oil-based polyurethane acrylate, epoxy soybean oil acrylate and the remaining soybean methyl ester are mixed and stirred, and then the pigment, the additive and the first slurry are added, and the mixture is stirred and ground to a fineness of ≤2 μm to obtain a base material;

[0022] Adding a desiccant into the base material and mixing them evenly, a durable and wear-resistant offset printing ink is obtained.

[0023] Beneficial effects of the present invention:

[0024] The present invention blends and compounds tung oil-based polyurethane acrylate, vinyl silica, epoxy soybean oil acrylate, methyl soybean oleate, pigment, fusible polytetrafluoroethylene powder, desiccant and auxiliary agent in a certain order, and finally prepares a durable and wear-resistant offset printing ink, the VOC content in the ink is low, and the wear resistance of the ink is excellent and the durability is good. Wherein, the offset printing ink prepared by the present invention is a plant-based ink, and the raw materials do not contain mineral oil components. The binder is prepared by blending tung oil-based polyurethane acrylate and epoxy soybean oil acrylate, and the solvent is methyl soybean oleate, which effectively reduces the odor of the offset printing ink and can reduce the VOC content in the offset printing ink. The binders of the present invention are all easily decomposable plant raw materials, with little environmental harm and good environmental protection. At the same time, vinyl silica and fusible polytetrafluoroethylene powder are added to the raw materials of the offset printing ink to effectively improve the stability and wear resistance of the offset printing ink.

[0025] The tung oil-based polyurethane acrylate prepared in the present invention is the main binder. It is synthesized using tung oil-based polyol, isophorone diisocyanate and hydroxyethyl acrylate as raw materials and dibutyltin laurate as a catalyst. It contains acrylate double bonds and polyurethane chains. By adding different additives, it can realize oxidative drying and UV curing dual-mode offset printing ink, which can be adapted to different production needs. In addition, tung oil contains conjugated trienoic acid, and its reaction activity is better than that of ordinary vegetable oils, which improves the drying speed. The tung oil-based polyurethane acrylate contains a large number of polar groups such as -OH and -NH, which can form hydrogen bonds or chemical bonds with non-absorbing substrates such as PET and metal, thereby improving the adhesion of the offset printing ink to the substrate. In the present invention, epoxy soybean oil acrylate is selected as the auxiliary binder. The acrylate is introduced through epoxy ring opening to enhance the oxidative crosslinking density. The epoxy skeleton provides rigid support, thereby improving the hardness and wear resistance of the offset printing ink. By adjusting the ratio of tung oil-based polyurethane acrylate to UV reactive diluent, it can support the oxidation / UV dual curing mode. The ingredients are green and safe, and are suitable for food packaging printing.

[0026] The present invention utilizes a vinyl silane coupling agent to modify silica particles. This vinyl silica significantly enhances its dispersibility in ink and its interfacial bonding with the resin, forming a cross-linked product. The vinyl silica prepared in this invention has an organic molecular network grafted onto the surface of the silica particles, encapsulating the inorganic particles. The surface vinyl groups copolymerize with the resin free radicals to form an organic-inorganic hybrid network, imparting excellent wear and weather resistance to the offset ink. The addition of polytetrafluoroethylene (PTFE) micropowder synergizes with the vinyl silane coupling agent-modified silica particles, further improving the offset ink's wear resistance and durability. The PTFE micropowder also reduces the offset ink's coefficient of friction, minimizing friction damage during transportation of printed materials and extending their shelf life. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0028] Example 1 The preparation method of tung oil-based polyurethane acrylate comprises the following steps:

[0029] 15.8 g of tung oil and 5.5 g of formic acid were weighed and added to a flask, which was placed in an oil bath and heated to 40° C. with continuous stirring. When the temperature reached 40° C., concentrated sulfuric acid catalyst was added, and hydrogen peroxide was added dropwise using a constant pressure dropping funnel over 30 minutes. The temperature was raised to 60° C. and the mixture was reacted for 6 hours. The mixture was cooled to room temperature and washed with deionized water until the pH was neutral. The aqueous phase was removed, and then vacuum distillation was performed at 120° C. The reaction was continued for 2 hours to obtain epoxy tung oil.

[0030] A certain amount of 10g of epoxy tung oil, 16g of methanol and concentrated sulfuric acid catalyst were sequentially added into a three-necked flask, stirred evenly, heated to 65°C, reacted for 70 minutes, and then added with sodium bicarbonate solid accounting for 3% of the weight of the weighed oil to quench the reaction. After the reaction was completed, the mixture was cooled to room temperature and centrifuged to remove the precipitate. The mixture was then distilled under reduced pressure at 120°C for 2 hours to remove impurities, thereby obtaining tung oil-based polyol.

[0031] 6.7 g of isophorone diisocyanate and 3.5 g of hydroxyethyl acrylate were uniformly mixed at 20°C, and a dibutyltin laurate catalyst (0.5% by weight, based on the total weight of the isophorone diisocyanate and hydroxyethyl acrylate) was added and allowed to react for 3 hours to synthesize a prepolymer. After the reaction, 10 g of the aforementioned jatropha oil-based polyol was added and the temperature was raised to 60°C. The -NCO content was monitored every 30 minutes during the reaction until the -NCO content remained constant, thereby obtaining a jatropha oil-based polyurethane acrylate.

[0032] The preparation method of Example 2 vinyl silica comprises the following steps:

[0033] 10 g of nano-silica was ultrasonically dispersed in anhydrous ethanol to prepare a nano-silica dispersion with a mass fraction of 5%. A 5% aqueous solution of vinyl silane coupling agent KH570 was stirred and hydrolyzed at 50°C for 5 hours. The silane coupling agent hydrolyzate was added to the nano-silica dispersion and mixed evenly. The pH was adjusted to 10 with ammonia water, and the temperature was raised to 5°C for reaction for 10 hours. After the reaction was completed, it was filtered and transferred to a Soxhlet extractor for circulation for 48 hours. The residual silane coupling agent was eluted with acetone, and then dried in a high-temperature drying oven at 60°C. Vinyl silica was obtained after grinding.

[0034] The preparation method of Example 3 durable wear-resistant offset printing ink comprises the following steps:

[0035] 5 parts by mass of the vinyl silica prepared in Example 2, 2 parts by mass of fusible polytetrafluoroethylene powder, and 1 part by mass of methyl soybean oleate were mixed, and the mixture was sheared at a speed of 2500 r / min for 20 minutes, and ultrasonically treated at 40 kHz for 30 minutes to obtain a first slurry;

[0036] 40 parts by mass of tung oil-based polyurethane acrylate prepared in Example 1, 20 parts by mass of epoxy soybean oil acrylate, and 14 parts by mass of methyl soybean ester were mixed, and stirred at 60° C. and 800 r / min for 30 min. Then, 12 parts by mass of pigment carbon black, 2 parts by mass of BYK-2152 dispersant, 1 part by mass of TEGO Glide 410, and 0.5 parts by mass of tocopherol were added to the first slurry, and the mixture was continued to be uniformly stirred and ground to a fineness of ≤2 μm to obtain a base material.

[0037] 2.5 parts by mass of a cobalt / manganese / zirconium composite desiccant was added to the above base material, wherein the mass ratio of cobalt element, manganese element and zirconium element was 5:3:2. The mixture was stirred at a speed of 300 r / min for 20 minutes, aged for 24 hours, and filtered through a 5 μm filter to obtain a durable and wear-resistant offset printing ink.

[0038] The preparation method of the durable wear-resistant offset printing ink of embodiment 4 comprises the following steps:

[0039] 6 parts by mass of the vinyl silica prepared in Example 2, 4 parts by mass of fusible polytetrafluoroethylene powder, and 2 parts by mass of methyl soybean oleate were mixed, and the mixture was sheared at a speed of 2500 r / min for 20 minutes, and ultrasonically treated at 40 kHz for 30 minutes to obtain a first slurry;

[0040] 40 parts by mass of tung oil-based polyurethane acrylate prepared in Example 1, 25 parts by mass of epoxy soybean oil acrylate, and 18 parts by mass of methyl soybean ester were mixed, and stirred at 60° C. and 800 r / min for 30 min. 12 parts by mass of pigment carbon black, 2.5 parts by mass of BYK-2152 dispersant, 1 part by mass of TEGO Glide 410, and 0.5 parts by mass of tocopherol were then added to the first slurry, and the mixture was continued to be uniformly stirred and ground to a fineness of ≤2 μm to obtain a base material.

[0041] 3 parts by mass of a cobalt / manganese / zirconium composite desiccant was added to the above base material, wherein the mass ratio of cobalt element, manganese element and zirconium element was 5:3:2. The mixture was stirred at a speed of 300 r / min for 20 minutes, aged for 24 hours, and filtered through a 5 μm filter to obtain a durable and wear-resistant offset printing ink.

[0042] The preparation method of the durable wear-resistant offset printing ink of embodiment 5 comprises the following steps:

[0043] 6 parts by mass of the vinyl silica prepared in Example 2, 3 parts by mass of fusible polytetrafluoroethylene powder, and 1 part by mass of methyl soybean oleate were mixed, and the mixture was sheared at a speed of 2500 r / min for 20 minutes, and ultrasonically treated at 40 kHz for 30 minutes to obtain a first slurry;

[0044] 35 parts by mass of the tung oil-based polyurethane acrylate prepared in Example 1, 20 parts by mass of epoxy soybean oil acrylate, and 14 parts by mass of methyl soybean ester were mixed, and stirred at 60° C. and 800 r / min for 30 min. 15 parts by mass of carbon black pigment, 2 parts by mass of BYK-2152 dispersant, 1 part by mass of TEGO Glide 410, and 0.5 parts by mass of tocopherol were then added to the first slurry, and the mixture was continued to be uniformly stirred and ground to a fineness of ≤2 μm to obtain a base material.

[0045] 2.5 parts by mass of a cobalt / manganese / zirconium composite desiccant was added to the above base material, wherein the mass ratio of cobalt element, manganese element and zirconium element was 5:3:2. The mixture was stirred at a speed of 300 r / min for 20 minutes, aged for 24 hours, and filtered through a 5 μm filter to obtain a durable and wear-resistant offset printing ink.

[0046] Comparative Example 1 The preparation method of the durable wear-resistant offset printing ink comprises the following steps:

[0047] 5 parts by mass of unmodified nano-silica, 2 parts by mass of fusible polytetrafluoroethylene powder and 1 part by mass of methyl soybean oleate were mixed, high-speed sheared at a speed of 2500 r / min for 20 minutes, and ultrasonically treated at 40 kHz for 30 minutes to obtain a first slurry;

[0048] 40 parts by mass of tung oil-based polyurethane acrylate prepared in Example 1, 20 parts by mass of epoxy soybean oil acrylate, and 14 parts by mass of methyl soybean ester were mixed, and stirred at 60° C. and 800 r / min for 30 min. Then, 12 parts by mass of pigment carbon black, 2 parts by mass of BYK-2152 dispersant, 1 part by mass of TEGO Glide 410, and 0.5 parts by mass of tocopherol were added to the first slurry, and the mixture was continued to be uniformly stirred and ground to a fineness of ≤2 μm to obtain a base material.

[0049] 2.5 parts by mass of a cobalt / manganese / zirconium composite desiccant was added to the above base material, wherein the mass ratio of cobalt element, manganese element and zirconium element was 5:3:2. The mixture was stirred at a speed of 300 r / min for 20 minutes, aged for 24 hours, and filtered through a 5 μm filter to obtain a durable and wear-resistant offset printing ink.

[0050] Comparative Example 2 The preparation method of the durable wear-resistant offset printing ink comprises the following steps:

[0051] 7 parts by mass of the vinyl silica prepared in Example 2 and 1 part by mass of methyl soybean oleate were mixed, and the mixture was high-speed sheared at a speed of 2500 r / min for 20 minutes, and ultrasonically treated at 40 kHz for 30 minutes to obtain a first slurry;

[0052] 40 parts by mass of tung oil-based polyurethane acrylate prepared in Example 1, 20 parts by mass of epoxy soybean oil acrylate, and 14 parts by mass of methyl soybean ester were mixed, and stirred at 60° C. and 800 r / min for 30 min. Then, 12 parts by mass of carbon black pigment, 2 parts by mass of BYK-2152 dispersant, 1 part by mass of TEGO Glide 410, and 0.5 parts by mass of tocopherol were added to the first slurry, and the mixture was continued to be uniformly stirred and ground to a fineness of ≤2 μm to obtain a base material.

[0053] 2.5 parts by mass of a cobalt / manganese / zirconium composite desiccant was added to the above base material, wherein the mass ratio of cobalt element, manganese element and zirconium element was 5:3:2. The mixture was stirred at a speed of 300 r / min for 20 minutes, aged for 24 hours, and filtered through a 5 μm filter to obtain a durable and wear-resistant offset printing ink.

[0054] Comparative Example 3 The preparation method of the durable wear-resistant offset printing ink comprises the following steps:

[0055] 5 parts by mass of the vinyl silica prepared in Example 2, 2 parts by mass of fusible polytetrafluoroethylene powder, and 1 part by mass of methyl soybean oleate were mixed, and the mixture was sheared at a speed of 2500 r / min for 20 minutes, and ultrasonically treated at 40 kHz for 30 minutes to obtain a first slurry;

[0056] 40 parts by mass of phenolic resin, 20 parts by mass of alkyd resin and 14 parts by mass of mineral oil were mixed, and stirred at 60° C. and 800 r / min for 30 min. Then, 12 parts by mass of carbon black pigment, 2 parts by mass of BYK-2152 dispersant, 1 part by mass of TEGO Glide 410 and 0.5 parts by mass of tocopherol were added to the first slurry, and the mixture was further stirred and ground to a fineness of ≤2 μm to obtain a base material.

[0057] 2.5 parts by mass of a cobalt / manganese / zirconium composite desiccant was added to the above base material, wherein the mass ratio of cobalt element, manganese element and zirconium element was 5:3:2. The mixture was stirred at a speed of 300 r / min for 20 minutes, aged for 24 hours, and filtered through a 5 μm filter to obtain a durable and wear-resistant offset printing ink.

[0058] Performance testing

[0059] Offset ink adhesion test: Refer to the national standard GB / T9286-1998 "Paints and varnishes, scratch test for paint films." Use a grid knife to scratch 10×10 (100) 1mm×1mm small grids on the test sample surface. Each scratch line should reach the bottom layer of the cured film; use a brush to clean the debris in the test area. Then, use 3M600 tape or tape of equivalent strength to firmly adhere to the small grid to be tested. Use an eraser to rub the tape vigorously to increase the contact area and strength between the tape and the test area. Grasp one end of the tape and quickly pull off the tape in a vertical direction (90°). Perform the same test twice at the same location. The test results are shown in Table 1.

[0060] Offset Ink Abrasion Resistance Test: This abrasion test evaluates the abrasion resistance of water-based ink coatings. A 7000-grit SiC sandpaper is placed on the ink surface, and a 200g weight is placed on the paper. The sample is then dragged horizontally for 10cm at a constant speed on the sandpaper. The sample is then rotated 90° clockwise and then dragged horizontally for another 10cm at a constant speed. This cycle continues until white spots appear. The number of white spots is recorded. The test results are shown in Table 1.

[0061] VOC content test: The VOC content of offset ink was measured according to the test standard in GB38507-2020 "Limits of Volatile Organic Compounds (VOCs) in Inks". The test results are shown in Table 1.

[0062] Thorough drying test: At an ambient temperature of 25°C, place a drop of water-based ink in the groove at the top of the scraper fineness meter. Use a scraper to gently scrape from the top to the bottom. Immediately cover with a PET film and record the position corresponding to 25μm on the scraper fineness meter. Gently press the PET film to remove it and start timing. Lightly dip paper at the 25μm mark on the PET film. When no more ink can be stained on the paper, stop timing and record the time. Repeat three times and take the average value. The obtained time is the thorough drying test. The test results are shown in Table 1.

[0063] Table 1: Statistical table of offset ink performance test data for Examples 3-5 and Comparative Examples 1-3

[0064] Adhesion wear resistance VOC content / % Thorough drying / h Example 3 Level 0 1200 1.1 2.4 Example 4 Level 0 1300 1.2 2.2 Example 5 Level 0 1300 1.0 2.1 Comparative Example 1 Level 1 800 1.2 2.5 Comparative Example 2 Level 1 1000 1.1 2.4 Comparative Example 3 Level 2 500 15.6 5.7

[0065] As shown in Table 1, the plant-based offset printing ink prepared by the present invention has short drying time, strong adhesion, good wear resistance, and low VOCs emission. The nano silicon dioxide powder added in Comparative Example 1 is not modified by vinyl silane coupling agent, and fusible polytetrafluoroethylene powder is not added in Comparative Example 2, and the wear resistance of the offset printing ink obtained greatly decreases, and adhesion also decreases. In Comparative Example 3, binder and solvent are replaced by phenolic resin, alkyd resin and mineral oil, and the VOCs emission of the offset printing ink obtained is greatly improved, and drying time is long, and adhesion also decreases. Show that the tung oil-based polyurethane acrylate prepared in the present invention improves the self-drying ability of ink as main binder, avoids the defect that soybean ink is slow to dry, the vinyl silicon dioxide added and fusible polytetrafluoroethylene powder make printed product wear resistance also be improved, fully adapt to the market requirement that ink requires fast printing, and are suitable for the use of high-end printed products with higher environmental requirements.

[0066] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A durable and wear-resistant offset printing ink, characterized in that: At least include the following raw materials in parts by weight: 30-45 parts of tung oil-based polyurethane acrylate, 4-8 parts of vinyl silica, 15-25 parts of epoxy soybean oil acrylate, 10-18 parts of methyl soybean oleate, 12-18 parts of pigment, 2-4 parts of fusible polytetrafluoroethylene powder, 1.5-3 parts of desiccant, and 3-5 parts of additives.

2. The durable and wear-resistant offset printing ink according to claim 1, characterized in that: The preparation method of the tung oil-based polyurethane acrylate comprises at least the following steps: Isophorone diisocyanate and hydroxyethyl acrylate are mixed, dibutyltin laurate is added as a catalyst, and a prepolymer is obtained after reaction; Jatropha curcas oil-based polyol is added to the prepolymer to obtain jatropha curcas oil-based polyurethane acrylate after reaction.

3. The durable and wear-resistant offset printing ink according to claim 2, characterized in that: The mass ratio of the isophorone diisocyanate, the hydroxyethyl acrylate and the jatropha curcas oil-based polyol is 5-8:3-5:10-15.

4. The durable and wear-resistant offset printing ink according to claim 1, characterized in that: The preparation method of the vinyl silica comprises the following steps: The nano-silica is dispersed in anhydrous ethanol, and vinyl silane coupling agent hydrolyzate is added, and the pH is adjusted to 10-11. After reaction, washing, drying and grinding, vinyl silica is obtained.

5. The durable and wear-resistant offset printing ink according to claim 4, characterized in that: The vinyl silane coupling agent is one or more of vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tri-tert-butyloxysilane, vinyl tri-tert-butyl peroxysilane and vinyl triacetoxysilane, and the mass ratio of the vinyl silane coupling agent to the nano-silica is 1:10-20.

6. The durable and wear-resistant offset printing ink according to claim 1, characterized in that: The auxiliary agent is one or a mixture of defoaming agent, leveling agent, dispersant, matting agent, UV active diluent, photoinitiator or polymerization inhibitor.

7. The durable and wear-resistant offset printing ink according to claim 1, characterized in that: The desiccant is one or a mixture of cobalt isooctanoate, manganese isooctanoate, cerium isooctanoate, iron isooctanoate, cobalt naphthenate or manganese naphthenate.

8. The durable and wear-resistant offset printing ink according to claim 1, characterized in that: The pigment is one of magenta, phthalocyanine blue B, benzidine yellow or carbon black, or a mixture of several of them.

9. A method for preparing a durable and wear-resistant offset printing ink, characterized in that: The method comprises at least the following preparation steps: Mixing vinyl silica, fusible polytetrafluoroethylene powder and methyl soybean oleate in an amount of 5-20% of the total amount of methyl soybean oleate to obtain a first slurry; The tung oil-based polyurethane acrylate, epoxy soybean oil acrylate and the remaining soybean methyl ester are mixed and stirred, and then the pigment, the additive and the first slurry are added, and the mixture is stirred and ground to a fineness of ≤2 μm to obtain a base material; Adding a desiccant into the base material and mixing them evenly, a durable and wear-resistant offset printing ink is obtained.