Water-based whiteboard marker ink and preparation method thereof

Abstract

The invention relates to the technical field of ink preparation, in particular to water-based whiteboard marker ink and a preparation method thereof. The water-based whiteboard marker ink is prepared from the following raw materials in parts by mass: 7 to 10 parts of pigment, 14 to 16 parts of water-based polyacrylic resin emulsion, 1.5 to 2 parts of dispersing agent, 1 to 1.5 parts of humectant, 2 to 3 parts of quick-drying aid, 1.2 to 1.4 parts of zinc stearate, 0.1 to 0.2 part of antibacterial and mildew-proof agent, 3 to 4 parts of imbibition agent and 65 to 70 parts of deionized water. The water-based whiteboard pen ink has remarkable advantages in the aspects of ink stability, adsorbability, quick-drying performance, environmental protection performance and the like, can meet the requirements of whiteboard writing and erasing, and meets the requirements of sustainable development at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of ink preparation, and particularly relates to an aqueous whiteboard pen ink and a preparation method thereof. Background Art

[0002] A whiteboard pen is a writing tool that can write on non-absorbent surfaces such as laminated plastics, enamels, and baked paints on whiteboards or color boards. When writing, the lines are smooth, the color is bright, and there is no dust or odor. It is widely used in offices, teaching, and other occasions. Whiteboard pens generally use a fiber water storage core to store ink and a porous fiber pen tip to draw ink.

[0003] In recent years, as a writing tool, the sales of whiteboard pens have been increasing in convenience stores and stationery stores. Whiteboard pens are often sold in packages with the pen tip facing up or down. However, if whiteboard pens for writing boards are sold in the above forms for a long time or placed during use, it is easy to have the problem that the line trace fades when the pen tip is placed upward. If the pen tip is placed downward, it will cause problems such as poor writing feel, even poor ink output, and blocked pen tip due to the settlement and aggregation of carbon black particles. At the same time, current whiteboard pens are mainly solvent-based, which causes environmental pollution problems. Summary of the Invention

[0004] The purpose of the present application is to provide an aqueous whiteboard pen ink and a preparation method thereof in view of the deficiencies of the current technology. The aqueous whiteboard pen ink of the present application uses an aqueous polyacrylic resin in combination with a dispersant with an anchoring group and a polymer extended chain. On the basis of suspending pigment particles with the aqueous polyacrylic resin, the dispersant is used to balance and adjust the suspension force of the pigment particles, achieving the purpose of stably dispersing the pigment particles and improving the stability of the ink. At the same time, an osmotic agent is added to the aqueous whiteboard pen ink of the present application. The osmotic agent can form a continuous adsorption layer on the surface of the winding core fiber of the whiteboard pen through the action of electrostatic force and hydrogen bonds, further forming a solventophilic surface, thereby enhancing the adsorption between the winding core fiber and the ink, forming a capillary effect, and increasing the height at which the ink can spontaneously rise in the winding core, avoiding the problems of the overall sinking of the ink in the winding core and the occurrence of broken ink at the pen tip. By adding a quick-drying additive, the quick-drying performance of the aqueous whiteboard pen ink can be significantly improved.

[0005] In the first aspect, the present application provides an aqueous whiteboard pen ink, adopting the following technical solution: An aqueous whiteboard pen ink, by mass, comprises the following preparation raw materials: 7 - 10 parts of pigment, 14 - 16 parts of aqueous polyacrylic resin emulsion, 1.5 - 2 parts of dispersant, 1 - 1.5 parts of humectant, 2 - 3 parts of quick-drying additive, 1.2 - 1.4 parts of zinc stearate, 0.1 - 0.2 parts of antibacterial and antifungal agent, 3 - 4 parts of osmotic agent, and 65 - 70 parts of deionized water.

[0006] By adopting the above technical solution, Pigment: The pigment is the color source of the ink. By suspending and dispersing pigment particles in the aqueous polyacrylic resin emulsion, the uniformity and stability of the ink color are ensured. Aqueous polyacrylic resin emulsion: As the matrix material of the ink, it provides the viscosity and stability of the ink. At the same time, when used in combination with a dispersant, it enhances the suspension and dispersion effects of pigment particles. Dispersant: The dispersant is used to balance the suspension force of pigment particles in the aqueous polyacrylic resin emulsion and improve the stability of the ink. At the same time, the anchoring groups and polymer extended chains in the dispersant contribute to the uniform dispersion of pigment particles. Humectant: The humectant is used to adjust the humidity of the ink, maintain the wetness of the ink during use, and prevent the ink from drying or caking. Quick-drying aid: Quick-drying aids such as nano-calcium carbonate are used to improve the quick-drying performance of the ink. By increasing the contact surface between gas and liquid, the ink drying process is accelerated. Zinc stearate: Zinc stearate acts as a lubricant and stabilizer, helping to improve the fluidity and stability of the ink. Antibacterial and antifungal agent: The antibacterial and antifungal agent is used to prevent the ink from mildewing or being contaminated by bacteria during use. Penetrant: The penetrant forms an adsorption layer on the surface of the fiber of the whiteboard pen refill core through electrostatic force and hydrogen bonding, enhancing the adsorption of the ink to the fiber and forming a capillary effect. At the same time, it increases the surface tension of the ink, enabling the ink to rise spontaneously and avoiding problems such as ink sinking and ink breakage. Deionized water: As the solvent and diluent of the ink, deionized water ensures the fluidity and uniformity of the ink. These components interact with each other and jointly act in the preparation process of the ink to ensure various properties of the ink such as color, stability, quick-drying performance, and surface tension. At the same time, through reasonable proportioning and process control, the green and environmental protection characteristics of the ink can be achieved.

[0007] Preferably, the preparation method of the aqueous polyacrylic resin emulsion includes the following steps: S21. Preparation of pre-emulsion: According to the mass parts, 75 parts of deionized water, 0.75 parts of sodium dodecyl sulfate, 0.75 parts of octylphenol polyoxyethylene ether OP-10, and 0.15 parts of sodium bicarbonate are successively added to a reactor and stirred until completely dissolved to form an emulsifier aqueous solution; S22. Pre-mixing of monomers: According to the mass parts, 30 parts of methyl methacrylate, 20 parts of butyl acrylate, 3 parts of acrylic acid, 1 part of hydroxypropyl acrylate, and 1 part of glycidyl methacrylate are mixed evenly to obtain a mixed monomer solution; S23. Preparation of initiator solution: 0.5 part of ammonium persulfate is dissolved in 10 parts of deionized water to prepare an initiator solution with a mass concentration of 5%; S24. Polymerization reaction: Place the aqueous solution of emulsifier in a reactor, heat it up to 82 °C, first add 20% of the mixed monomer solution and 20% of the initiator solution to initiate the prepolymerization reaction, then heat it up to 82 °C again, and uniformly dropwise add the remaining 80% of the mixed monomer solution and the remaining 80% of the initiator solution within 2 hours. After the dropping is completed, react at 82 °C for 3 - 4 hours; then cool it down to below 45 °C, slowly dropwise add ammonia water to adjust the pH to 7.8 - 8.2, and filter to obtain an aqueous polyacrylic resin emulsion.

[0008] By adopting the above technical solution, using methyl methacrylate (MMA) and butyl acrylate (BA) as the main reaction monomers, acrylic acid (AA), hydroxypropyl acrylate (HPA), and glycidyl methacrylate (GMA) as functional monomers, and using sodium dodecyl sulfate and octylphenol polyoxyethylene ether OP - 10 as the emulsifying and dispersing agents, an aqueous acrylic resin emulsion with good water resistance and film - forming properties is synthesized. This aqueous acrylic resin emulsion can significantly improve the quick - drying performance of the ink, has good compatibility with pigments, can better disperse pigments, and improves the stability of the ink.

[0009] Preferably, the preparation method of the imbibition agent is as follows: Weigh 100 - 120 parts of octadecyl dimethyl tertiary amine, 30 - 35 parts of 1,2 - dibromoethane, and 130 parts of absolute ethanol according to mass parts, place them in a three - necked distillation flask with a stopper, connect a snake - shaped condenser and a magnetic stirring electrothermal mantle, and finally slowly heat the reaction device to 80 - 85 °C using a heating mantle, control the temperature constantly, and carry out a reflux reaction for 24 - 28 h to obtain the imbibition agent.

[0010] By adopting the above technical solution, the prepared imbibition agent can form a continuous adsorption layer on the surface of the core fiber of the whiteboard pen roll through the action of electrostatic force and hydrogen bonds, further form a solvent - loving surface, thereby enhancing the adsorption of the core fiber of the roll and the ink, and forming a capillary effect; at the same time, the imbibition agent of the present application can increase the surface tension of the ink. Under the combined action of the surface tension and the pressure difference inside and outside the capillary, the height at which the ink can spontaneously rise in the core of the roll increases, avoiding the problems of the overall sinking of the ink in the core of the roll and the occurrence of ink breakage at the pen tip.

[0011] Preferably, the pigment is carbon black pigment.

[0012] Preferably, the dispersant is composed of sodium dodecyl benzene sulfonate and BYK - 160 dispersant of BYK Chemie in a mass part ratio of 1:3.

[0013] By adopting the above technical solution, the dispersant forms a stable adsorption layer with the pigment particles through its anchoring group and the polymer extended chain, enabling the pigment particles to be uniformly dispersed in the aqueous polyacrylic resin emulsion and improving the stability of the ink. The dispersant and the aqueous polyacrylic resin emulsion act together to balance the suspension force between the pigment particles and further enhance the stability of the ink. Sodium dodecylbenzenesulfonate and BYK-160 dispersant from BYK Chemie are mixed in a specific ratio, which may form a synergistic effect. This synergistic effect may be due to the complementarity of the two dispersants in molecular structure and chemical properties, enabling them to achieve better results in dispersing pigment particles than when used alone. For example, sodium dodecylbenzenesulfonate may provide better wettability and dispersibility, while BYK-160 may provide better stability and adsorbability.

[0014] Preferably, the humectant is one of glycerol and polyethylene glycol.

[0015] Preferably, the quick-drying aid is nano calcium carbonate.

[0016] By adopting the above technical solution, the nano calcium carbonate particles contain certain pores, which increase the contact surface between gas and liquid, thereby improving the quick-drying performance of the ink. This means that the ink can dry faster after writing, reducing smudging and penetration problems during writing. Nano calcium carbonate, together with the aqueous polyacrylic resin emulsion and other dispersants, forms an effective pigment dispersion and stabilization system. This synergistic effect not only improves the quick-drying performance of the ink but also enhances the overall performance and stability of the ink. In summary, the role of nano calcium carbonate in this application is to cooperate with other components through its special physical structure and chemical properties to jointly improve the quick-drying performance and stability of the aqueous whiteboard pen ink. This improvement not only enhances the user experience of the product but also conforms to the development concept of green environmental protection.

[0017] Preferably, the antibacterial and mildew-proof agent is benzotriazole.

[0018] In a second aspect, the present application provides a method for preparing an aqueous whiteboard pen ink, adopting the following technical solution: As a general technical concept, the present application also provides the method for preparing the above aqueous whiteboard pen ink, including the following steps: S91. According to the mass parts, add deionized water and the dispersant into a glass beaker, stir and dissolve, then add the aqueous polyacrylic resin emulsion, stir evenly, add the pigment, continue to stir, and then transfer to a ball mill for grinding for 20 - 24 hours. Transfer the ground solution back to the glass beaker again to obtain the mixed solution A; S92. According to the mass parts, add the humectant, quick-drying aid, zinc stearate, antibacterial and mildew-proof agent, and bleeding agent to the mixed solution A and stir evenly to obtain the aqueous whiteboard pen ink.

[0019] In summary, the beneficial technical effects of the present application are as follows: 1. Improve ink stability: By using the combination of aqueous polyacrylic resin emulsion and dispersant, it can effectively and stably disperse pigment particles, improving the stability of the ink. At the same time, the suspension and dispersion of pigments contribute to the uniformity and durability of the ink color.

[0020] 2. Enhance adsorption and capillary effect: By adding a bleeding agent, a continuous adsorption layer and a solventophilic surface can be formed on the surface of the fiber of the whiteboard pen refill core, enhancing the adsorption between the fiber and the ink and forming a capillary effect. This helps the ink to spontaneously rise in the refill core, avoiding problems such as the overall sinking of the ink and the ink breakage at the pen tip.

[0021] 3. Improve quick-drying performance: By using quick-drying aids such as nano-calcium carbonate and synthesized aqueous acrylic resin emulsion, the quick-drying performance of the ink can be significantly improved. This is particularly important for whiteboard pens that require quick writing and erasing.

[0022] 4. Environmental protection performance: The aqueous whiteboard pen ink of the present application is green and environmentally friendly, meeting the concept of green development. Aqueous inks generally contain fewer organic solvents and harmful substances compared to oily inks, having less impact on the environment and human health.

[0023] 5. Improve the compatibility between the ink and the pigment: By using an aqueous acrylic resin emulsion synthesized by selecting appropriate reactive monomers and functional monomers, the compatibility between the ink and the pigment can be improved, ensuring the uniform dispersion and stability of the pigment in the ink. Specific embodiments

[0024] The following will describe the implementation scheme of the present application in detail in combination with embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. For those conditions not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified for the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0025] In the following examples and preparation examples, 1 part represents 10 g, and the average particle size of nano-calcium carbonate is 25 nanometers.

[0026] Preparation Example 1 Preparation of aqueous polyacrylic resin emulsion The preparation method of the aqueous polyacrylic resin emulsion includes the following steps: S21. Preparation of pre-emulsion: According to the mass parts, 75 parts of deionized water, 0.75 part of sodium dodecyl sulfate, 0.75 part of octylphenol polyoxyethylene ether OP-10, and 0.15 part of sodium bicarbonate are sequentially added to the reactor and stirred until completely dissolved to form an emulsifier aqueous solution; S22. Monomer premixing: Mix 30 parts of methyl methacrylate, 20 parts of butyl acrylate, 3 parts of acrylic acid, 1 part of hydroxypropyl acrylate and 1 part of glycidyl methacrylate evenly by mass to obtain a mixed monomer solution. S23. Initiator solution preparation: Dissolve 0.5 part of ammonium persulfate in 10 parts of deionized water to prepare an initiator solution with a mass concentration of 5%. S24. Polymerization reaction: Place the emulsifier aqueous solution in a reactor, heat it to 82 °C, first add 20% of the mixed monomer solution and 20% of the initiator solution to initiate the prepolymerization reaction, then heat it to 82 °C, and uniformly add the remaining 80% of the mixed monomer solution and the remaining 80% of the initiator solution within 2 hours. After the addition is complete, react at 82 °C for 3.5 hours; then cool it to below 45 °C, slowly add ammonia water to adjust the pH to 8, and filter to obtain an aqueous polyacrylic resin emulsion.

[0027] Preparation of the imbibition agent in Preparation Example 2 The preparation method of the imbibition agent is as follows: Weigh 110 parts of octadecyl dimethyl tertiary amine, 33 parts of 1,2-dibromoethane and 130 parts of absolute ethanol by mass, place them in a three-necked distillation flask with a stopper, connect a snake-shaped condenser and a magnetic stirring electric heating mantle, and finally slowly heat the reaction device to 82 °C using the heating mantle, control the temperature constantly, and carry out a reflux reaction for 26 h to obtain the imbibition agent.

[0028] Example 1 An aqueous whiteboard pen ink, by mass, includes the following preparation raw materials: 7 parts of carbon black pigment, 14 parts of aqueous polyacrylic resin emulsion, 1.5 parts of dispersant, 1 part of glycerol, 2 parts of nano calcium carbonate, 1.2 parts of zinc stearate, 0.1 part of benzotriazole, 3 parts of imbibition agent, 65 parts of deionized water. The dispersant is composed of sodium dodecyl benzene sulfonate and BYK-160 dispersant of BYK Chemie in a mass ratio of 1:3. The preparation method of the above aqueous whiteboard pen ink includes the following steps: S91. Add deionized water and the dispersant to a glass beaker by mass, stir and dissolve, then add the aqueous polyacrylic resin emulsion, stir evenly, add the carbon black pigment, continue to stir and then transfer it to a ball mill for grinding for 20 hours. Transfer the ground solution back to the glass beaker again to obtain a mixed solution A. S92. Add glycerol, nano calcium carbonate, zinc stearate, benzotriazole and the imbibition agent to the mixed solution A by mass and stir evenly to obtain the aqueous whiteboard pen ink.

[0029] Example 2 A water-based whiteboard pen ink, comprising the following raw materials by weight: 10 parts of carbon black pigment, 16 parts of water-based polyacrylic resin emulsion, 2 parts of dispersant, 1.5 parts of polyethylene glycol, 3 parts of nano calcium carbonate, 1.4 parts of zinc stearate, 0.2 parts of benzotriazole, 4 parts of osmotic agent, and 70 parts of deionized water, wherein the dispersant is composed of sodium dodecylbenzene sulfonate and BYK chemical dispersant BYK-160 in a weight ratio of 1:3; The preparation method of the above-mentioned water-based whiteboard pen ink comprises the following steps: S91. Add deionized water and dispersant to a glass beaker according to their weight fractions, stir to dissolve, add aqueous polyacrylic acid resin emulsion, stir evenly, add carbon black pigment, continue stirring, transfer to a ball mill and grind for 24 hours, transfer the ground solution to a glass beaker again to obtain a mixed solution A; S92. Add polyethylene glycol, nano-calcium carbonate, zinc stearate, benzotriazole and an absorbing agent into the mixed solution A according to their weight proportions, and stir evenly to obtain a water-based whiteboard pen ink.

[0030] Example 3 A water-based whiteboard pen ink, comprising the following raw materials by weight: 8 parts of carbon black pigment, 15 parts of water-based polyacrylic resin emulsion, 1.7 parts of dispersant, 1.3 parts of glycerol, 2.5 parts of nano calcium carbonate, 1.3 parts of zinc stearate, 0.15 parts of benzotriazole, 3.5 parts of absorbing agent, and 67 parts of deionized water, wherein the dispersant is composed of sodium dodecylbenzene sulfonate and BYK-160 dispersant in a weight ratio of 1:3; The preparation method of the above-mentioned water-based whiteboard pen ink comprises the following steps: S91. Add deionized water and dispersant to a glass beaker according to their weight fractions, stir to dissolve, add aqueous polyacrylic acid resin emulsion, stir evenly, add carbon black pigment, continue stirring, transfer to a ball mill and grind for 22 hours, transfer the ground solution to a glass beaker again to obtain a mixed solution A; S92. Add propylene glycol, nano-calcium carbonate, zinc stearate, benzotriazole and an absorbing agent into the mixed solution A according to their weight proportions, and stir evenly to obtain a water-based whiteboard pen ink.

[0031] Comparative Example 1 The same as Example 3, except that an equal amount of polyvinyl butyral is used to replace the aqueous polyacrylic acid resin emulsion.

[0032] Comparative Example 2 Same as Example 3, except that the amount of imbibing agent is 0 parts.

[0033] Comparative Example 3 Same as Example 3, except that the amount of nano calcium carbonate is 0 parts.

[0034] Comparative Example 4 It is the same as Example 3, except that the dispersant is sodium dodecylbenzenesulfonate.

[0035] Comparative Example 5 It is the same as Example 3, except that the dispersant is BYK-160 dispersant of BYK Chemie.

[0036] Performance Test Samples of the water-based whiteboard pen inks prepared in Examples 1 - 3 and Comparative Examples 1 - 5 were taken respectively for the following tests. Each group of test samples was tested 3 times, and the results were averaged. Viscosity Test: Take the ink to be tested and add it into the test container of a rotary viscometer. Select an appropriate rotor and immerse the rotor completely in the ink. Connect the test container to a constant temperature water bath and adjust the temperature of the water bath to 25°C. Turn on the circulating water and keep it at a constant temperature for 30 min. After adjusting the viscometer to the working state, conduct the measurement. The test results are shown in Table 1.

[0037] Surface Tension Test: Take the ink to be tested and add it into the special sample dish of the tensiometer, filling it to about two-thirds. Conduct the measurement at room temperature. The test results are shown in Table 1.

[0038] Ink Storage Stability Test: Refer to "GB / T 9755-2014 Test Method for Storage Stability of Coatings", put the ink into an oven at 60°C for high-temperature storage. Take out the samples at regular intervals (1 month, 2 months, 3 months, and 4 months) for viscosity and particle size tests, and compare them with the initial viscosity and particle size. If the viscosity change does not exceed 20% and the particle size change does not exceed 10%, the ink is judged to be stable. The test results are shown in Table 1.

[0039] Capillary Self-Suction Height Test: The test method is carried out according to 5.7 in the enterprise standard Q / SLCG 0403-2021 of the imbibition extraction agent for fracturing fluid of Shengli Oilfield. The test results are shown in Table 2.

[0040] Anti-Stratification Performance Test: Conduct the initial writing test on the test sample and keep the initial writing scribing trace as a sample. Put the test pen into a color box and place it upright and upside down at room temperature for different times, and compare it with the color of the initial trace. If there is no ink bleeding problem or obvious fading in the trace, it is judged to be qualified. The test results are shown in Table 2.

[0041] Fast-drying test: After filling the pen with ink and shaking it well, write on a smooth whiteboard. Since the ink film thickness is small, visually observe the evaporation of the solvent to test the fast-drying property. Record the inks in the order of drying on the whiteboard from the fastest to the slowest as follows: drying time ≤ 30 seconds is recorded as level 0 - 3, 30 - 60 seconds is recorded as level 4 - 6, and > 60 seconds is recorded as level 7 - 9. The test results are shown in Table 1.

[0042] Table 1 Physical and Chemical Index Tests and Storage Stability Tests Table 2 Capillary Self-absorption Height and Anti-stratification Performance Analyzing the data in Tables 1 and 2, it can be seen that: 1) The water-based whiteboard pen inks prepared in Examples 1 - 3 have good stability, fast-drying property, and anti-stratification performance, avoiding the problems of the overall sinking of the ink in the roll core and ink breakage at the pen tip.

[0043] 2) Through the comparative analysis of the performance of the water-based whiteboard pen inks prepared by combining Example 3 and Comparative Example 1, it is shown that in this application, methyl methacrylate (MMA) and butyl acrylate (BA) are used as the main reaction monomers, acrylic acid (AA), hydroxypropyl acrylate (HPA), and glycidyl methacrylate (GMA) are used as functional monomers, and sodium dodecyl sulfate and octylphenol polyoxyethylene ether OP-10 are used as emulsifying and dispersing agents to synthesize a water-based acrylic resin emulsion with good water resistance and film-forming performance. This water-based acrylic resin emulsion can significantly improve the fast-drying property of the ink, has good compatibility with pigments, can better disperse pigments, and improve the stability, fast-drying property, and anti-stratification performance of the ink.

[0044] 3) Through the comparative analysis of the performance of the water-based whiteboard pen inks prepared by combining Example 3 and Comparative Example 2, it is shown that the bleeding inhibitor prepared in this application can form a continuous adsorption layer on the surface of the fibers of the roll core of the whiteboard pen through the action of electrostatic force and hydrogen bonds, further forming a solventophilic surface, thereby enhancing the adsorption of the roll core fibers and the ink, and forming a capillary effect; at the same time, the bleeding inhibitor of this application can increase the surface tension of the ink. Under the combined action of the surface tension and the pressure difference inside and outside the capillary, the height at which the ink can spontaneously rise in the roll core increases, avoiding the problems of the overall sinking of the ink in the roll core and ink breakage at the pen tip.

[0045] 4) Comparative analysis of the performance of the water-based whiteboard pen ink prepared by combining Example 3 and Comparative Example 3 shows that the nano-calcium carbonate particles contain certain pores, which increase the contact surface between gas and liquid, thus improving the quick-drying performance of the ink. This means that the ink can dry faster after writing, reducing the problems of bleeding and penetration during writing. The nano-calcium carbonate, together with the water-based polyacrylic resin emulsion and other dispersants, acts together to form an effective pigment dispersion and stabilization system. This synergistic effect not only improves the quick-drying performance of the ink, but also enhances the overall performance and stability of the ink.

[0046] 5) Comparative analysis of the performance of the water-based whiteboard pen ink prepared by combining Example 3 and Comparative Examples 4 - 5 shows that the dispersant is composed of sodium dodecylbenzenesulfonate and BYK-160 dispersant from BYK Chemie in a mass ratio of 1:3. The dispersant forms a stable adsorption layer with the pigment particles through its anchoring group and polymer extended chain, enabling the pigment particles to be uniformly dispersed in the water-based polyacrylic resin emulsion and improving the stability of the ink. The dispersant and the water-based polyacrylic resin emulsion act together to balance the suspension force between the pigment particles, further enhancing the stability of the ink. Sodium dodecylbenzenesulfonate and BYK-160 dispersant from BYK Chemie are used in a specific ratio to form a synergistic effect, significantly improving the comprehensive performance of the water-based whiteboard pen ink.

[0047] The above embodiments are only used to explain and illustrate the technical solutions of the present application rather than to limit them. Although the above embodiments have specifically described the present application, those skilled in the art should understand that modifications or equivalent replacements can still be made to the specific implementation manners of the present invention. Any modification and equivalent replacement that do not depart from the spirit and scope of the present application should be covered within the protection scope of the present application.

Claims

1. A water-based whiteboard pen ink, characterized in that: The preparation raw materials include the following by weight: 7-10 parts of pigment, 14-16 parts of water-based polyacrylic resin emulsion, 1.5-2 parts of dispersant, 1-1.5 parts of moisturizing agent, 2-3 parts of quick-drying auxiliary agent, 1.2-1.4 parts of zinc stearate, 0.1-0.2 parts of antibacterial and mildew-proof agent, 3-4 parts of imbibing agent and 65-70 parts of deionized water.

2. A water-based whiteboard pen ink according to claim 1, characterized in that: The preparation method of the aqueous polyacrylic acid resin emulsion comprises the following steps: S21, pre-emulsion preparation: according to the mass fractions, 75 parts of deionized water, 0.75 parts of sodium lauryl sulfate, 0.75 parts of octylphenol polyoxyethylene ether OP-10 and 0.15 parts of sodium bicarbonate were added to the reactor in sequence, and stirred until completely dissolved to form an emulsifier aqueous solution; S22, monomer premixing: 30 parts by mass of methyl methacrylate, 20 parts by mass of butyl acrylate, 3 parts by mass of acrylic acid, 1 part by mass of hydroxypropyl acrylate and 1 part by mass of glycidyl methacrylate were mixed to obtain a mixed monomer liquid; S23, preparation of initiator solution: dissolve 0.5 parts of ammonium persulfate in 10 parts of deionized water to prepare an initiator solution with a mass concentration of 5%; S24, polymerization reaction: Place the emulsifier aqueous solution in a reactor, heat it to 82°C, first add 20% mixed monomer liquid and 20% initiator solution to initiate a prepolymerization reaction, then heat it to 82°C, and uniformly add the remaining 80% mixed monomer liquid and the remaining 80% initiator solution dropwise within 2 hours. After the addition is complete, react at 82°C for 3-4 hours; then cool it to below 45°C, slowly add ammonia water to adjust the pH to 7.8-8.2, filter, and obtain an aqueous polyacrylic resin emulsion.

3. A water-based whiteboard pen ink according to claim 1, characterized in that: The preparation method of the absorbing agent is as follows: 100-120 parts of octadecyldimethyl tertiary amine, 30-35 parts of 1,2-dibromoethane and 130 parts of anhydrous ethanol are weighed according to mass fractions, placed in a stoppered three-necked distillation flask, connected with a serpentine condenser and a magnetic stirring electric heating jacket, and finally the reaction device is slowly heated to 80-85° C. by the heating jacket, and the temperature is controlled constantly, and refluxed for 24-28 hours to obtain the absorbing agent.

4. A water-based whiteboard pen ink according to claim 1, characterized in that: The pigment is a carbon black pigment.

5. A water-based whiteboard pen ink according to claim 1, characterized in that: The dispersant is composed of sodium dodecylbenzene sulfonate and BYK-160, a BYK chemical dispersant, in a mass ratio of 1:

3.

6. A water-based whiteboard pen ink according to claim 1, characterized in that: The moisturizing agent is one of glycerol and polyethylene glycol.

7. A water-based whiteboard pen ink according to claim 1, characterized in that: The quick-drying auxiliary agent is nano calcium carbonate.

8. A water-based whiteboard pen ink according to claim 1, characterized in that: The antibacterial and mildew-proof agent is benzotriazole.

9. A method for preparing the water-based whiteboard pen ink according to any one of claims 1 to 8, characterized in that: The following steps are involved: S91. Add deionized water and dispersant to a glass beaker according to their weight fractions, stir to dissolve, add aqueous polyacrylic acid resin emulsion, stir evenly, add pigment, continue stirring, transfer to a ball mill and grind for 20-24 hours, transfer the ground solution to a glass beaker again to obtain a mixed solution A; S92. Add the moisturizing agent, quick-drying aid, zinc stearate, antibacterial and mildew-proof agent and wicking agent into the mixed solution A according to their weight proportions and stir evenly to obtain water-based whiteboard pen ink.

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