A quick-drying water-based ink and preparation method thereof

Abstract

The present invention discloses a kind of quick-drying water-based ink and preparation method thereof, including by weight percentage:Aqueous acrylic emulsion 40 50%, aqueous alkyd resin 15 20%, polyethylene wax 1 2%, pigment 10 30%, defoamer 0.1 0.3%, leveling agent 0.2 0.5%, dispersant 0.1 0.5%, coupling agent 0.1 1%, remainder is water. The present invention prepares water-based ink using aqueous acrylic emulsion and aqueous alkyd resin as a binder, and aqueous alkyd resin adopts the drying vegetable oil, crystalline polyol and aromatic polyacid or acid anhydride of specific mixing ratio as main raw material;The introduction of drying vegetable oil can accelerate the drying of ink, and crystalline polyol can improve the crosslinking speed and density of aqueous alkyd resin, and aromatic polyacid or acid anhydride introduce aromatic ring for aqueous alkyd resin to improve polymer heat resistance.The drying speed and heat resistance of aqueous ink prepared by the present invention are significantly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a quick-drying water-based ink and a preparation method thereof. Background Art

[0002] Ink is a key material used in printing. It is a homogeneous mixture of substances such as colorants (such as pigments), binders (resins), fillers, additives, and solvents. It is a colored, fluid, slurry-like adhesive. Ink can be used to print or inkjet print patterns and text on substrates and is widely used in various printing applications, including books and periodicals, packaging and decoration, and architectural decoration. As social demand increases, the variety and production of inks are also expanding and growing accordingly.

[0003] Water-based inks (abbreviated as "water-based ink") use water as a solvent or dispersant. Using a water-based polymer resin as a binder, they contain no harmful organic solvents, reducing environmental pollution and harm to the human body, undoubtedly making them more environmentally friendly. Water-based acrylic emulsions not only possess the advantages of organic solvent-based resins, such as excellent gloss, acid and alkali resistance, and good weather and stain resistance, but also offer advantages such as low price, safety, energy conservation, and reduced environmental and public pollution. They are low-VOC, green, and environmentally friendly materials. Their versatility and excellent physical and chemical properties make them the preferred binder for water-based inks. However, compared to traditional solvent-based inks, water-based inks dry more slowly, which can affect production efficiency and often require additional drying equipment or longer drying times.

[0004] Therefore, it is necessary to further develop water-based inks with fast drying properties. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a quick-drying water-based ink.

[0006] Another object of the present invention is to provide a method for preparing the quick-drying water-based ink.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A quick-drying water-based ink comprising the following components by weight percentage:

[0009] Water-based acrylic emulsion 40-50%,

[0010] Water-based alkyd resin 15-20%,

[0011] Polyethylene wax 1-2%,

[0012] Pigment 10-30%,

[0013] Defoaming agent 0.1-0.3%,

[0014] Leveling agent 0.2-0.5%,

[0015] Dispersant 0.1-0.5%,

[0016] Coupling agent 0.1-1%,

[0017] The balance is water;

[0018] The preparation of the waterborne alkyd resin comprises the following steps:

[0019] (1) In a nitrogen or noble gas atmosphere, 10-15 parts by weight of vegetable oil, 0.2-0.5 parts by weight of catalyst, 2-5 parts by weight of diglycerol, 15-20 parts by weight of crystalline polyol, 20-25 parts by weight of polyacid or anhydride, and 40-80 parts by weight of xylene are added to a reactor, and the mixture is heated to 190-210° C. and refluxed to carry out esterification reaction;

[0020] (2) Sampling the reaction system to determine the acid value. When the acid value is 25-30 mgKOH / g, heating is stopped and xylene is removed by vacuum distillation.

[0021] (3) A neutralizing agent is added to the reaction system to adjust the pH to 7-8 to obtain the waterborne alkyd resin.

[0022] Preferably, the vegetable oil is safflower oil and walnut oil in a mass ratio of 1:(3-5).

[0023] Preferably, the catalyst is at least one of antimony oxide, antimony acetate, tin oxide, lithium hydroxide, monobutyltin oxide, dibutyltin oxide, and dibutyltin dilaurate.

[0024] Preferably, the crystalline polyol is at least one of neopentyl glycol, pentaerythritol, and erythritol.

[0025] Preferably, the polyacid is at least one of phthalic acid, isophthalic acid, terephthalic acid, and 2,6-naphthalene dicarboxylic acid.

[0026] Preferably, the acid anhydride is at least one of phthalic anhydride, benzoic anhydride and trimellitic anhydride.

[0027] Preferably, the dispersant is at least one of oleamide, sodium lignin sulfonate, sodium tripolyphosphate, sodium pyrophosphate, and sodium silicate.

[0028] Preferably, the defoaming agent is an organosilicon defoaming agent. In some embodiments of the present invention, the organosilicon defoaming agent includes but is not limited to at least one of BYK-020, BYK-077, and BYK-085 produced by BYK in Germany.

[0029] In some embodiments of the present invention, the leveling agent includes but is not limited to at least one of EFKA-3033, EFKA-3777, EFKA-3236, and EFKA-3288 produced by BASF of Germany.

[0030] Preferably, the coupling agent is a silane coupling agent. In some embodiments of the present invention, the silane coupling agent includes but is not limited to at least one of KH550, KH560, KH570, and KH792 produced by Shanghai Aladdin Biochemical Technology Co., Ltd.

[0031] Preferably, the preparation of the aqueous acrylic emulsion comprises the following steps:

[0032] S1, adding 30-40 parts by weight of methyl methacrylate, 5-10 parts by weight of acrylic acid, 10-15 parts by weight of N-hydroxymethyl acrylamide, and 2-3 parts by weight of an emulsifier to 15-20 parts by weight of water and mixing uniformly to obtain an emulsion;

[0033] S2, the emulsion obtained in step S1 and 8-10 parts by weight of an aqueous solution of an initiator with a concentration of 5-8 wt% are simultaneously added dropwise to 90-100 parts by weight of water at 85-95° C., and the mixture is kept warm for 1-2 hours after the addition is completed to obtain a first reaction solution;

[0034] S3, taking 1 / 4 of the amount of methyl methacrylate, acrylic acid, and N-hydroxymethyl acrylamide used in step S1, and preparing a mixed solution with 2-3 parts by weight of hydroxyethyl methacrylate and 0.5-1 parts by weight of thioacetic acid;

[0035] S4, synchronously adding dropwise the mixed solution prepared in step S3 and 8-10 parts by weight of an aqueous solution of an initiator with a concentration of 5-8 wt% to the first reaction solution obtained in step S2, and after the addition is complete, heat at 85-95° C. for 1-2 hours to obtain a second reaction solution;

[0036] S5. After lowering the temperature of the second reaction liquid to 55-60° C., add thereto 0.5-1 parts by weight of a mixture of tert-butyl hydroperoxide and sodium isoascorbate and 8-10 parts by weight of water, continue to keep the temperature at 55-60° C. for 1-2 hours, then naturally cool to room temperature, and then add a neutralizer to adjust the pH to 7-8, thereby obtaining the aqueous acrylic emulsion.

[0037] Preferably, the neutralizing agent is at least one of triethanolamine, triethylamine, N,N-dimethylethanolamine, ammonia water, sodium carbonate, and sodium hydroxide.

[0038] Preferably, the emulsifier is at least one of alkylphenol polyoxyethylene ether, sodium lauryl sulfate, and sodium dodecylbenzene sulfonate.

[0039] Preferably, the initiator is at least one of ammonium persulfate, sodium persulfate, and potassium persulfate.

[0040] Preferably, in step S5, the mass ratio of tert-butyl hydroperoxide to sodium isoascorbate is 1:(1-2).

[0041] The method for preparing the quick-drying water-based ink comprises the following steps:

[0042] (1) Weigh all components by weight and mix them at room temperature and 400-600 r / min for 30-45 min;

[0043] (2) The mixed materials are fed into a ball mill and ground to a fineness of less than 15 μm to obtain the quick-drying water-based ink.

[0044] The present invention has the following advantages and effects compared to the prior art:

[0045] (1) The present invention uses water-based acrylic emulsion and self-made water-based alkyd resin as binders to prepare water-based ink. The self-made water-based alkyd resin uses a specific mixing ratio of dry vegetable oil, crystalline aliphatic polyol and aromatic polyacid or anhydride as main raw materials; wherein, the introduction of dry vegetable oil can accelerate the drying of ink, the crystalline aliphatic polyol can increase the crosslinking speed and crosslinking density of the water-based alkyd resin, and the aromatic polyacid or anhydride introduces aromatic rings into the water-based alkyd resin to improve the heat resistance of the polymer. After the water-based alkyd resin is blended with the water-based acrylic emulsion and other additives, the drying speed and heat resistance of the obtained ink are significantly improved. At the same time, the self-made water-based alkyd resin also introduces diglycerol, whose hydroxyl group can participate in the reaction and can increase the main chain length and reduce the degree of branching, thereby improving the water resistance and adhesion of the prepared ink.

[0046] (2) The present invention further adopts emulsion technology and designs a core-shell structure by a two-step dropping method to prepare a water-based acrylic emulsion, which can improve the dispersibility of the prepared ink, which is beneficial to improving the storage stability of the ink. At the same time, it can also better combine the ink with the substrate surface, further improving the adhesion fastness of the ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 These are the test results of initial drying, heat resistance, and scratch resistance of the water-based inks prepared in the examples and comparative examples.

[0049] Figure 2 The following are the test results of water resistance, storage stability and adhesion fastness of the water-based inks prepared in the examples and comparative examples. DETAILED DESCRIPTION

[0050] The embodiments of the present invention will be clearly and completely described below with reference to the examples. The examples described are only some of the embodiments of the present invention, rather than all of them. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field based on the examples in the present invention without making any creative work are within the scope of protection of the present invention.

[0051] The reagents or instruments used in the present invention, if the manufacturer is not indicated, are all conventional products that can be purchased from the market. For process parameters not specifically indicated, conventional techniques can be used.

[0052] The commercially available water-based acrylic emulsion used in the specific embodiment of the present invention was purchased from Guangzhou Xinlian New Materials Co., Ltd., CAS: 25085-34-1;

[0053] The polyethylene wax used was purchased from Shanghai MacLean Biochemical Technology Co., Ltd., product number: P816883;

[0054] The commercially available waterborne alkyd resin used was purchased from Pande (Shanghai) International Trading Co., Ltd.

[0055] The safflower oil used was purchased from Tianjin Xiensi Biochemical Technology Co., Ltd., product number: S-00600;

[0056] The walnut oil used was purchased from Shanghai Dingfen Chemical Technology Co., Ltd., product number: P032987;

[0057] The permanent orange pigment used was purchased from Lily Group Co., Ltd. Example 1

[0058] This embodiment provides a quick-drying water-based ink, which includes the following components by weight percentage:

[0059] Water-based acrylic emulsion 45%,

[0060] Waterborne alkyd resin 15%,

[0061] Polyethylene wax 2%,

[0062] Pigment (Permanent Orange) 20%,

[0063] Defoamer (BYK-077) 0.2%,

[0064] Leveling agent (EFKA-3033) 0.4%,

[0065] Dispersant (oleamide) 0.2%,

[0066] Coupling agent (KH550) 0.3%,

[0067] The balance was deionized water.

[0068] The aqueous acrylic emulsion used in this embodiment was prepared according to the following steps:

[0069] S1, adding 40 parts by weight of methyl methacrylate, 6 parts by weight of acrylic acid, 10 parts by weight of N-hydroxymethyl acrylamide, and 2 parts by weight of alkylphenol polyoxyethylene ether to 20 parts by weight of deionized water and mixing uniformly to obtain an emulsion;

[0070] S2, the emulsion obtained in step S1 and 8 parts by weight of a 5 wt% aqueous solution of ammonium persulfate were simultaneously added dropwise to 100 parts by weight of deionized water at 90° C., and the mixture was kept warm for 2 hours after the addition was completed to obtain a first reaction solution;

[0071] S3, taking 1 / 4 of the amount of methyl methacrylate, acrylic acid, and N-hydroxymethyl acrylamide used in step S1, and preparing a mixed solution with 2 parts by weight of hydroxyethyl methacrylate and 0.8 parts by weight of thioacetic acid;

[0072] S4, synchronously adding the mixed solution prepared in step S3 and 8 parts by weight of a 5 wt% aqueous solution of ammonium persulfate to the first reaction solution obtained in step S2, and keeping the mixture at 90° C. for 1 hour after the addition is complete to obtain a second reaction solution;

[0073] S5. After lowering the temperature of the second reaction liquid to 60° C., add 0.9 parts by weight of a mixture of tert-butyl hydroperoxide and sodium isoascorbate in a mass ratio of 1:2 and 10 parts by weight of deionized water thereto, continue to keep the temperature at 60° C. for 1.5 hours, then naturally cool to room temperature, and then add sodium carbonate to adjust the pH to 7.5, to obtain the aqueous acrylic emulsion.

[0074] The water-based alkyd resin used in this embodiment was prepared as follows:

[0075] (1) In a nitrogen atmosphere, 10 parts by weight of safflower oil and walnut oil in a mass ratio of 1:4, 0.2 parts by weight of antimony acetate, 3 parts by weight of diglycerol, 15 parts by weight of pentaerythritol, 25 parts by weight of trimellitic anhydride, and 60 parts by weight of xylene were added to a reactor and heated to 190°C under reflux for esterification reaction;

[0076] (2) Sampling the reaction system to determine the acid value. When the acid value reaches 25 mgKOH / g, heating is stopped and xylene is removed by vacuum distillation.

[0077] (3) Sodium carbonate was added to the reaction system to adjust the pH to 7.5 to obtain the waterborne alkyd resin.

[0078] The quick-drying water-based ink of this embodiment is prepared according to the following steps:

[0079] (1) All components were weighed by weight and mixed at room temperature and 500 r / min for 40 min;

[0080] (2) The mixed materials are fed into a ball mill and ground to a fineness of less than 15 μm to obtain the quick-drying water-based ink. Example 2

[0081] This embodiment provides a quick-drying water-based ink, which includes the following components by weight percentage:

[0082] Water-based acrylic emulsion 40%,

[0083] Waterborne alkyd resin 15%,

[0084] Polyethylene wax 2%,

[0085] Pigment (Permanent Orange) 25%,

[0086] Defoamer (BYK-085) 0.1%,

[0087] Leveling agent (EFKA-3236) 0.2%,

[0088] Dispersant (sodium lignin sulfonate) 0.2%,

[0089] Coupling agent (KH792) 0.2%,

[0090] The balance was deionized water.

[0091] The aqueous acrylic emulsion used in this embodiment was prepared according to the following steps:

[0092] S1, adding 36 parts by weight of methyl methacrylate, 8 parts by weight of acrylic acid, 12 parts by weight of N-hydroxymethyl acrylamide, and 2 parts by weight of sodium lauryl sulfate to 18 parts by weight of deionized water and mixing uniformly to obtain an emulsion;

[0093] S2, the emulsion obtained in step S1 and 8 parts by weight of a 5 wt% sodium persulfate aqueous solution were simultaneously added dropwise to 90 parts by weight of deionized water at 95° C., and the mixture was kept warm for 1 hour after the addition was completed to obtain a first reaction solution;

[0094] S3, taking 1 / 4 of the amount of methyl methacrylate, acrylic acid, and N-hydroxymethyl acrylamide used in step S1, and preparing a mixed solution with 3 parts by weight of hydroxyethyl methacrylate and 0.6 parts by weight of thioacetic acid;

[0095] S4, synchronously adding the mixed solution prepared in step S3 and 8 parts by weight of a 5 wt% sodium persulfate aqueous solution to the first reaction solution obtained in step S2, and keeping the mixture at 95° C. for 1.5 h after the addition is complete to obtain a second reaction solution;

[0096] S5. After lowering the temperature of the second reaction liquid to 60° C., add 0.6 parts by weight of a mixture of tert-butyl hydroperoxide and sodium isoascorbate in a mass ratio of 1:1 and 8 parts by weight of deionized water thereto, continue to keep the temperature at 60° C. for 2 hours, then naturally cool to room temperature, and then add ammonia water to adjust the pH to 7, thereby obtaining the aqueous acrylic emulsion.

[0097] The water-based alkyd resin used in this embodiment was prepared as follows:

[0098] (1) In a nitrogen atmosphere, 12 parts by weight of safflower oil and walnut oil in a mass ratio of 1:3, 0.5 parts by weight of dibutyltin oxide, 3 parts by weight of diglycerol, 18 parts by weight of erythritol, 25 parts by weight of benzoic anhydride, and 60 parts by weight of xylene were added to a reactor and heated to 200°C and refluxed for esterification reaction;

[0099] (2) Sampling the reaction system to determine the acid value. When the acid value is 27 mgKOH / g, heating is stopped and xylene is removed by vacuum distillation.

[0100] (3) Ammonia water is added to the reaction system to adjust the pH to 7 to obtain the waterborne alkyd resin.

[0101] The quick-drying water-based ink of this embodiment is prepared according to the following steps:

[0102] (1) All components were weighed by weight and mixed at room temperature and 500 r / min for 45 min;

[0103] (2) The mixed materials are fed into a ball mill and ground to a fineness of less than 15 μm to obtain the quick-drying water-based ink. Example 3

[0104] This embodiment provides a quick-drying water-based ink, which includes the following components by weight percentage:

[0105] Water-based acrylic emulsion 50%,

[0106] Water-based alkyd resin 20%,

[0107] Polyethylene wax 2%,

[0108] Pigment (Permanent Orange) 15%,

[0109] Defoamer (BYK-020) 0.3%,

[0110] Leveling agent (EFKA-3777) 0.5%,

[0111] Dispersant (sodium tripolyphosphate) 0.5%,

[0112] Coupling agent (KH570) 0.5%,

[0113] The balance was deionized water.

[0114] The aqueous acrylic emulsion used in this embodiment was prepared according to the following steps:

[0115] S1, adding 32 parts by weight of methyl methacrylate, 6 parts by weight of acrylic acid, 12 parts by weight of N-hydroxymethyl acrylamide, and 3 parts by weight of sodium dodecylbenzenesulfonate to 15 parts by weight of deionized water and mixing uniformly to obtain an emulsion;

[0116] S2, the emulsion obtained in step S1 and 10 parts by weight of a 6 wt% aqueous solution of ammonium persulfate were simultaneously added dropwise to 90 parts by weight of deionized water at 85° C., and the mixture was kept warm for 1.5 hours after the addition was completed to obtain a first reaction solution;

[0117] S3, taking 1 / 4 of the amount of methyl methacrylate, acrylic acid, and N-hydroxymethyl acrylamide used in step S1, and preparing a mixed solution with 2 parts by weight of hydroxyethyl methacrylate and 0.5 parts by weight of thioacetic acid;

[0118] S4, synchronously adding the mixed solution prepared in step S3 and 10 parts by weight of a 6 wt% aqueous solution of ammonium persulfate to the first reaction solution obtained in step S2, and keeping the mixture at 85° C. for 2 h after the addition is complete to obtain a second reaction solution;

[0119] S5. After lowering the temperature of the second reaction liquid to 55° C., add thereto a solution prepared by a mixture of 0.8 parts by weight of tert-butyl hydroperoxide and sodium isoascorbate in a mass ratio of 1:1 and 10 parts by weight of deionized water, continue to keep the temperature at 55° C. for 1 hour, then naturally cool to room temperature, and then add triethylamine to adjust the pH to 8, thereby obtaining the aqueous acrylic emulsion.

[0120] The water-based alkyd resin used in this embodiment was prepared as follows:

[0121] (1) In a nitrogen atmosphere, 12 parts by weight of safflower oil and walnut oil in a mass ratio of 1:5, 0.4 parts by weight of tin oxide, 4 parts by weight of diglycerol, 20 parts by weight of neopentyl glycol, 25 parts by weight of 2,6-naphthalenedicarboxylic acid, and 60 parts by weight of xylene were added to a reactor and heated to 200°C and refluxed for esterification reaction;

[0122] (2) Sampling the reaction system to determine the acid value. When the acid value reaches 30 mgKOH / g, heating is stopped and xylene is removed by vacuum distillation.

[0123] (3) Triethylamine was added to the reaction system to adjust the pH to 8 to obtain the waterborne alkyd resin.

[0124] The quick-drying water-based ink of this embodiment is prepared according to the following steps:

[0125] (1) All components were weighed by weight and mixed at room temperature and 600 r / min for 35 min;

[0126] (2) The mixed materials are fed into a ball mill and ground to a fineness of less than 15 μm to obtain the quick-drying water-based ink. Example 4

[0127] The difference between this embodiment and embodiment 1 is that the water-based acrylic emulsion used is a commercially available water-based acrylic emulsion purchased from Guangzhou Xinlian New Materials Co., Ltd., CAS: 25085-34-1. Comparative Example 1

[0128] The difference between this comparative example and Example 1 is that the waterborne alkyd resin used is a commercially available waterborne alkyd resin purchased from Pandex (Shanghai) International Trading Co., Ltd. Comparative Example 2

[0129] The difference between this comparative example and Example 1 is that in the process of preparing the water-based alkyd resin, safflower oil is used as the 10 parts by weight of vegetable oil. Comparative Example 3

[0130] The difference between this comparative example and Example 1 is that in the process of preparing the water-based alkyd resin, all 10 parts by weight of the vegetable oil are walnut oil. Comparative Example 4

[0131] The difference between this comparative example and Example 1 is that no diglycerol component is added during the preparation of the waterborne alkyd resin.

[0132] Performance Testing

[0133] In order to further demonstrate the effects of the present invention, the water-based inks prepared in the above examples and comparative examples were subjected to the following performance tests:

[0134] 1. Initial drying test

[0135] The ink was printed on the surface of the polytetrafluoroethylene plate using a 250 mesh screen. The initial drying property of the water-based ink was tested according to GB / T13217.5-2008 "Test method for initial drying property of liquid ink". The test results are as follows: Figure 1 shown.

[0136] 2. Heat resistance test

[0137] The ink was printed on the surface of a polytetrafluoroethylene plate using a 250 mesh screen. After the ink was dried and solidified at room temperature, it was baked at 200°C for 12 hours. The surface condition of the ink layer was observed. The test results are as follows: Figure 1 shown.

[0138] 3. Water resistance test

[0139] Print the ink on the surface of the polytetrafluoroethylene plate using a 250 mesh screen. Leave it at room temperature until the ink is dried and solidified. Test the water resistance of the ink with reference to GB / T1733-1993 "Determination of Water Resistance of Paint Films" and observe the bubbling and shedding of the ink. The test results are as follows: Figure 2 shown.

[0140] 4. Storage stability test

[0141] The prepared ink was left to stand at room temperature under sealed conditions for 3 months, and the flocculation, precipitation and agglomeration of the ink were observed. The test results are as follows: Figure 2 shown.

[0142] 5. Adhesion fastness test

[0143] The ink was printed on the surface of the polytetrafluoroethylene plate using a 250 mesh screen. After the ink was left to dry and solidify at room temperature, the adhesion fastness of the ink was tested according to GB / T13217.7-2009 "Test method for adhesion fastness of liquid inks". The test results are as follows: Figure 2 shown.

[0144] 6. Scratch resistance test

[0145] The ink was printed on the surface of a polytetrafluoroethylene plate using a 250-mesh screen. After the ink was left to dry and solidify at room temperature, a 2019 version of a 1-yuan coin was used to apply a 100g load to the ink layer for a scratch test. The peeling condition was visually observed. The test results are as follows: Figure 1 shown.

[0146] Depend on Figure 1 and Figure 2The test results show that the storage stability and adhesion fastness of the ink of Example 4 are significantly lower than those of the inks of Examples 1-3 because the homemade water-based acrylic emulsion of the present invention is not used, but its initial drying property, heat resistance and water resistance still maintain relatively good performance; the ink of Comparative Example 1 has significantly lower performance in many aspects because the homemade water-based alkyd resin of the present invention is not used; the inks of Comparative Examples 2 and 3 do not mix safflower oil and walnut oil in the process of preparing the water-based alkyd resin, and their initial drying property is significantly lowered, indicating that the simultaneous use of safflower oil and walnut oil in the present invention is beneficial to improving the drying performance of the ink; the ink of Comparative Example 4 does not add diglycerol components in the process of preparing the water-based alkyd resin, and its water resistance and adhesion fastness are lower than those of the inks of Examples 1-4.

[0147] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A quick-drying water-based ink, characterized in that: The following components are included by weight percentage: Water-based acrylic emulsion 40-50%, Water-based alkyd resin 15-20%, Polyethylene wax 1-2%, Pigment 10-30%, Defoaming agent 0.1-0.3%, Leveling agent 0.2-0.5%, Dispersant 0.1-0.5%, Coupling agent 0.1-1%, The balance is water; The preparation of the waterborne alkyd resin comprises the following steps: (1) In a nitrogen or noble gas atmosphere, 10-15 parts by weight of vegetable oil, 0.2-0.5 parts by weight of catalyst, 2-5 parts by weight of diglycerol, 15-20 parts by weight of crystalline polyol, 20-25 parts by weight of polyacid or anhydride, and 40-80 parts by weight of xylene are added to a reactor, and the mixture is heated to 190-210° C. and refluxed to carry out esterification reaction; (2) Sampling the reaction system to determine the acid value. When the acid value is 25-30 mgKOH / g, heating is stopped and xylene is removed by vacuum distillation. (3) adding a neutralizing agent to the reaction system to adjust the pH to 7-8 to obtain the waterborne alkyd resin; The preparation of the aqueous acrylic emulsion comprises the following steps: S1, adding 30-40 parts by weight of methyl methacrylate, 5-10 parts by weight of acrylic acid, 10-15 parts by weight of N-hydroxymethyl acrylamide, and 2-3 parts by weight of an emulsifier to 15-20 parts by weight of water and mixing uniformly to obtain an emulsion; S2, the emulsion obtained in step S1 and 8-10 parts by weight of an aqueous solution of an initiator with a concentration of 5-8 wt% are simultaneously added dropwise to 90-100 parts by weight of water at 85-95° C., and the mixture is kept warm for 1-2 hours after the addition is completed to obtain a first reaction solution; S3, taking 1 / 4 of the amount of methyl methacrylate, acrylic acid, and N-hydroxymethyl acrylamide used in step S1, and preparing a mixed solution with 2-3 parts by weight of hydroxyethyl methacrylate and 0.5-1 parts by weight of thioacetic acid; S4, synchronously adding dropwise the mixed solution prepared in step S3 and 8-10 parts by weight of an aqueous solution of an initiator with a concentration of 5-8 wt% to the first reaction solution obtained in step S2, and after the addition is complete, heat at 85-95° C. for 1-2 hours to obtain a second reaction solution; S5. After lowering the temperature of the second reaction liquid to 55-60° C., adding 0.5-1 parts by weight of a mixture of tert-butyl hydroperoxide and sodium isoascorbate and 8-10 parts by weight of water, the mixture is kept at 55-60° C. for 1-2 hours, and then naturally cooled to room temperature. A neutralizing agent is added to adjust the pH to 7-8, thereby obtaining the aqueous acrylic emulsion. The vegetable oils are safflower oil and walnut oil in a mass ratio of 1:(3-5).

2. The quick-drying water-based ink according to claim 1, characterized in that: The catalyst is at least one of antimony oxide, antimony acetate, tin oxide, lithium hydroxide, monobutyltin oxide, dibutyltin oxide, and dibutyltin dilaurate.

3. The quick-drying water-based ink according to claim 1, characterized in that: The crystalline polyol is at least one of neopentyl glycol, pentaerythritol, and erythritol; the polyacid is at least one of phthalic acid, isophthalic acid, terephthalic acid, and 2,6-naphthalene dicarboxylic acid; and the acid anhydride is at least one of phthalic anhydride, benzoic anhydride, and trimellitic anhydride.

4. The quick-drying water-based ink according to claim 1, characterized in that: The dispersant is at least one of oleamide, sodium lignin sulfonate, sodium tripolyphosphate, sodium pyrophosphate, and sodium silicate.

5. The quick-drying water-based ink according to claim 1, characterized in that: The neutralizing agent is at least one of triethanolamine, triethylamine, N,N-dimethylethanolamine, ammonia water, sodium carbonate, and sodium hydroxide.

6. The quick-drying water-based ink according to claim 1, characterized in that: The emulsifier is at least one of alkylphenol polyoxyethylene ether, sodium dodecyl sulfate, and sodium dodecylbenzene sulfonate; the initiator is at least one of ammonium persulfate, sodium persulfate, and potassium persulfate.

7. The quick-drying water-based ink according to claim 1, characterized in that: In step S5, the mass ratio of tert-butyl hydroperoxide to sodium isoascorbate is 1:(1-2).

8. The method for preparing the quick-drying water-based ink according to claim 1, characterized in that: The steps include: (1) Weigh all components by weight and mix them at room temperature and 400-600 r / min for 30-45 min; (2) The mixed materials are fed into a ball mill and ground to a fineness of less than 15 μm to obtain the quick-drying water-based ink.

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