CN116355458A - Gel ink composition for preventing fluorescent pen from halation, preparation method thereof and pen refill - Google Patents

Abstract

The invention discloses a neutral ink composition for preventing halation of a fluorescent pen, a preparation method thereof and a pen core, wherein the neutral ink composition comprises the following raw materials in parts by weight: 25-40 parts of color paste, 10-25 parts of humectant, 15-30 parts of modified film forming resin, 0.1-1 part of lubricant, thickener, pH regulator, preservative and the balance of deionized water; wherein the modified film-forming resin is modified water-based acrylic resin. The neutral ink composition for preventing the halation of the fluorescent pen has the advantages of excellent drying speed, water resistance, wet rubbing fastness, moderate viscosity, smooth writing and excellent halation preventing capability of the fluorescent pen, and solves the problem that the ink in the market is easy to scratch after being marked by the fluorescent pen.

Description

Gel ink composition for preventing fluorescent pen from halation, preparation method thereof and pen refill

Technical Field

The invention relates to the technical field of water-based ink, in particular to a neutral ink composition for preventing a fluorescent pen from halation, a preparation method thereof and a pen core.

Background

The viscosity of the gel ink writing medium is between that of water and oil, the gel ink writing medium has the advantages of both water-based ink and oil-based ink, has comfortable writing hand feeling, smooth ink output, and forms the characteristics of water resistance, sun resistance, long storage time, aging resistance and the like. The gel ink contains an organic solvent which is lower in viscosity than the oily ink and thicker than the aqueous ink. When writing, the ink passes through the pen point, and is converted into liquid ink from semi-solid state, and the neutral ink has the greatest advantages that each drop of ink is arranged on the pen point, and the ink cannot volatilize and leak water, and the ink flow is smooth and stable, so that the writing feeling like a silk can be provided.

Most of neutral inks in the market are easy to dye the just-written word by a fluorescent pen after writing the word for 2 seconds, so that the written word is not clean, on one hand, the word cannot be dried quickly after writing, natural writing is easy to be stained after the fluorescent pen is used for drying, on the other hand, even if the writing is completely dried, the phenomenon of stain can occur after the fluorescent pen is used, because the pen point of the fluorescent pen is completely soaked, water-based, and common ink is easy to be stained by halation.

In the prior art, the specific test method for the drying time of the ink writing line comprises the following steps: loading a pen core to be measured on a writing circle drawing instrument to draw a section continuously, starting a stopwatch to 20s when the stop is finished, covering writing paper with the same property on the end stitch, pressing the writing paper on the paper surface of the covering paper by using a special weight, re-timing, separating the two papers after 10min, and checking whether the covering paper has ink marks; if the overlay paper has ink, the time of the chronograph is subtracted by 0.5s, and the steps are repeated until the overlay paper has no ink. However, in an actual writing scene, the finger is easy to scratch after writing to cause smearing, and especially writing stains are easy to cause when children use the writing stains. At present, the industry does not have relevant detection standards on the quick-drying performance of ink, and even if the ink on the market claims to have the quick-drying performance, the ink can not reach the effects of immediately drying after writing and immediately smearing with a fluorescent pen after writing for 2 seconds without halation.

The disclosed patent document "quick-drying straight liquid type water-based ink" (application number: CN 201810658054.5) has the advantages that the film formation is accelerated to inhibit the diffusion of the ink on the surface and in the interior of paper by configuring the proportion of the curing resin and the inorganic nano dispersion liquid, so that the quick-drying effect is achieved, however, the test method is still adopted for the quick-drying standard, the minimum drying time is 3s, and the anti-halation performance is required to be improved in the actual writing process.

Disclosure of Invention

In view of the above-mentioned problems, the present invention provides a neutral ink composition for preventing halation of a highlighter, a preparation method thereof, and a neutral pen core comprising the neutral ink composition. The invention provides a modified water-based acrylic resin, by adding the resin, the dryness and wet rubbing fastness of the ink are greatly improved, a fluorescent pen is used for marking and smearing the ink, handwriting is not dizziness and dyed, and the clean and clear impression of writing is ensured. The technical scheme of the invention is as follows:

as a first aspect of the present invention, there is provided a neutral ink composition for preventing halation of a highlighter, comprising, by weight: 25-40 parts of color paste, 10-25 parts of humectant, 15-30 parts of modified film forming resin, 0.1-1 part of lubricant, thickener, pH regulator, preservative and the balance of deionized water;

regulating the pH value of the ink to 8.0-8.5 by adopting a pH regulator, wherein the viscosity of the ink product is regulated to 1500-2000 mpa.s by adopting the thickener;

the modified film-forming resin is modified water-based acrylic resin, and is prepared by step-by-step modification of acrylic monomers by polyether modified organosilicon and vinylsilane S210, and comprises the following components:

preferably, the modified aqueous acrylic resin is prepared by the following method:

(a) Mixing and uniformly stirring 20-30 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 1-2 parts of acrylic acid and 1-2 parts of butyl ether acrylamide to obtain a core layer mixed monomer A;

(b) Adding the core layer mixed monomer A, an initiator azo diisobutyl amidine hydrochloride, an emulsifier and deionized water into an emulsifying machine, emulsifying for at least 20min, and then dripping polyether modified organosilicon to obtain a core layer pre-emulsion B;

(c) Adding 20-30 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 1-2 parts of butyl etherified acrylamide, an emulsifying agent and deionized water into an emulsifying machine, emulsifying for at least 30min, dropwise adding vinyl silane S210 while emulsifying, raising the temperature to 80-120 ℃ after the dropwise adding is finished, dropwise adding the core layer pre-emulsion B prepared in the step (B), and preserving the heat for at least 30min after the dropwise adding is finished to obtain a shell layer pre-emulsion C;

(d) And (3) regulating the pH value of the shell layer pre-emulsion C obtained in the step (C) to 7-8 by using a pH regulator, adding an amide ethylene modified amine functional group polymer, and stirring and uniformly mixing to obtain a copolymer emulsion, thus obtaining the modified aqueous acrylic resin.

Preferably, the polyether modified organosilicon is added in an amount of 0.5% of the total amount of the modified aqueous acrylic resin, and the vinyl silane S210 is added in an amount of 0.8% of the total amount of the modified aqueous acrylic resin.

Preferably, the color paste is carbon black color paste, red color paste, blue color paste or pigment type color paste with other colors.

Preferably, the humectant is one or a combination of a plurality of ethylene glycol, propylene glycol, glycerol, diethylene glycol, polyethylene glycol, sorbitol and 1, 2-hexanediol.

Preferably, the lubricant is one or a combination of a plurality of phosphate, oleic acid, potassium oleate and sodium oleate.

Preferably, the thickener is selected from one or more of xanthan gum, methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, starch, gelatin, sodium alginate, guar gum and chitosan.

Preferably, the preservative is an aqueous low-toxicity environment-friendly bactericide.

As a second aspect of the present invention, there is provided a method for preparing the anti-halation neutral ink composition for a fluorescent pen, comprising the steps of:

(a) Mixing 10-25 parts of humectant and 0.1-1 part of lubricant at normal temperature, and stirring;

(b) Sequentially adding a preservative and 15-30 parts of modified aqueous acrylic resin while stirring, wherein the time interval between each addition of the raw materials is at least 10min, and adding after fully and uniformly mixing;

(c) Then adding 25-40 parts of color paste, uniformly stirring, and adding a pH regulator to adjust the pH of the ink to 8.0-8.5;

(e) And finally adding a thickening agent to adjust the viscosity, supplementing the balance with deionized water, and uniformly mixing to obtain the finished ink.

As a third aspect of the present invention, there is provided a neutral pen refill comprising such a neutral ink composition, comprising a barrel and an ink inside the barrel, said ink being said neutral ink composition for preventing halation of a highlighter.

In the research, if the water resistance and wet rubbing fastness of the ink are not good, the phenomenon of halation is caused, so that quick drying and strong wet rubbing fastness are required to be achieved for preventing the fluorescent pen from halation of the handwriting. Based on the theory, in the self-synthesized modified water-based acrylic resin, a certain amount of polyether modified organosilicon is added in the synthesis process to improve the wet rubbing fastness, and in addition, the addition of the vinyl silane S210 greatly improves the quick-drying performance of the acrylic resin.

Compared with the prior art, the invention has the beneficial effects that:

the invention can achieve the effect of preventing the fluorescent pen from being stained, mainly because the modified aqueous acrylic resin is added, the wet rubbing fastness of the ink is improved by adding a certain amount of polyether modified organosilicon in the synthesis process, so that the ink has certain leveling property, the friction coefficient is reduced, and the effect of inhibiting the generation of foam is also achieved. In addition, the addition of the vinyl silane S210 greatly improves the adhesive force of the acrylic resin, and improves the drying property of the resin through crosslinking with the acrylic emulsion. Compared with resins commonly used in other water-based ink, such as water-based acrylic resin and emulsion, water-based polyurethane resin, water-based aldehyde ketone resin, polyvinylpyrrolidone, styrene maleic anhydride copolymer emulsion and the like, the dry speed and wet rubbing fastness are poor, the required addition amount is too large, so that writing is not smooth, even the problem of incapability of writing occurs, and the effect of preventing the halation of the fluorescent pen cannot be achieved due to the small addition amount. The neutral ink composition for preventing the halation of the highlighter has excellent drying speed and wet rubbing fastness, and has moderate viscosity without affecting the writing effect.

Based on the reasons, the modified aqueous acrylic resin synthesized by the invention not only has smooth writing, but also has excellent anti-halation capability of the fluorescent pen, and solves the problem that the ink on the market is easy to scratch after being marked by the fluorescent pen.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.

FIG. 1 is a schematic diagram showing the effect of halation by a highlighter after writing for 2 seconds with a neutral ink pen provided in examples 1-1 to 1-9 of the present invention;

FIG. 2 is a schematic illustration of the halation effect of a prior art neutral ink pen after 2 seconds of writing with a highlighter.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The effect of the halation by the highlighter after 2s writing with four commercially available neutral ink pens is shown in fig. 2, and the halation problem is found to be serious, resulting in untidy writing.

In view of this problem, the inventors studied the components and preparation process of the ink, and provided typical examples and comparative examples as follows.

Example 1, a neutral ink composition for preventing halation of a highlighter

35 parts of carbon black color paste,

15 parts of ethylene glycol, and the mixture is prepared from,

20 parts of modified aqueous acrylic resin,

0.5 part of phosphoric acid ester,

0.7 part of xanthan gum, and the mixture is prepared from the following components,

1.0 part of triethanolamine, and the mixture is prepared from the following components,

preservative 0.1, specific ingredients are poly 2-methyl-4-isothiazolin-3-one compounds.

27.7 parts of deionized water.

Wherein, the synthetic modified aqueous acrylic resin is prepared by the following method:

TABLE 1 Synthesis of modified aqueous acrylic resin composition Table

(a) Methyl methacrylate, butyl acrylate, acrylic acid and butyl ether acrylamide monomers are added into a beaker and stirred uniformly to obtain a nuclear layer mixed monomer A;

(b) Adding the core layer mixed monomer A, an initiator azo diisobutyl amidine hydrochloride, an emulsifier and deionized water into an emulsifying machine, emulsifying for 20min, and then slowly dripping polyether modified organosilicon to obtain a core layer pre-emulsion B;

(c) Adding methyl methacrylate, butyl acrylate, butyl ether acrylamide, an emulsifier and deionized water into an emulsifying machine, emulsifying for 30min, dropwise adding vinyl silane S210 while emulsifying, raising the temperature to 90 ℃ after the dropwise adding is finished, slowly dropwise adding core layer pre-emulsion B, and preserving the heat for 30min after the dropwise adding is finished to obtain shell layer pre-emulsion C;

(d) Regulating pH to 7-8 with ammonia water, and adding amide ethylene modified amine functional polymer to obtain the modified water-based acrylic resin.

Example 2 preparation method of a neutral ink composition for preventing halation of a fluorescent pen

(a) Mixing 10-25 parts of humectant and 0.1-1 part of lubricant at normal temperature, and stirring for 10min.

(b) Adding 0.1-0.5 part of preservative and 15-30 parts of modified aqueous acrylic resin in sequence while stirring, wherein the raw materials are added every 10min, and the mixture is added after being fully and uniformly mixed.

(c) Then adding 25-40 parts of color paste, stirring uniformly, and adding a PH regulator to regulate the PH of the printing ink to 8.0-8.5.

(e) And finally adding a thickening agent to adjust the viscosity, and supplementing the balance with deionized water to obtain the finished ink.

After the ink finished product is made according to the percentage in the example 1 and the preparation method in the example 2, the viscosity and the particle size are detected, and the test is carried out by centrifugation at 2500r/min for 1 hour, so as to detect whether layering phenomenon occurs, and the ink is assembled into a gel ink pen, so that whether writing is smooth is detected. And after writing the handwriting for 2 seconds, using fluorescent strokes to pass through the handwriting, detecting whether the handwriting is clean and tidy, and judging the halation effect of the fluorescent pen. The results are shown in FIG. 1.

Examples 1-1 to examples 1 to 9 modified aqueous acrylic resin and neutral ink compositions were prepared using the mass ratios and processes shown in table 1:

table 2 neutral ink compositions of examples 1-1 to examples 1-9 with different compositions and proportions

As can be seen from the summary of the results of the above examples and the results of FIG. 1, the modified aqueous acrylic resin synthesized by the present invention has excellent anti-halation effect of fluorescent pen, the wet rubbing fastness is improved by adding a certain amount of polyether modified organosilicon in the synthesis process, and in addition, the addition of vinyl silane S210 greatly improves the adhesion and drying performance of the acrylic resin, the addition amount is controlled between 15-30 parts, the addition amount is less than 15%, the anti-halation capability requirement of the fluorescent pen is not met, the addition amount is more than 30%, and the writing smoothness performance is not met after the pen core is made.

Example 3 gel ink pen refill

The neutral ink composition for preventing the halation of the highlighter provided in example 1 was included as a filler filled in the cartridge holder.

Test examples

The inventors have also studied the anti-halation performance of the product under conditions of a greater proportion, and the results are summarized below:

test example 1 the following table shows the effect of the amounts of the different components added on the results.

Table 3: the effect of the addition amount of the raw materials on the anti-halation effect within the range listed

The modified aqueous acrylic resin is synthesized by formula design according to the formula addition amount of 1-9 in the third table, then the finished ink is prepared, and after the anti-halation test, the anti-halation effect is good, however, 10-11 has slight dirty scratch after the anti-halation test, and the analysis reasons are probably caused by the fact that polyether modified organosilicon and vinyl silane S210 are independently added in the process of synthesizing the modified aqueous acrylic acid, so that the two raw materials can play a synergistic effect, which is indispensable.

Test example 2 the following table shows the effect of the addition amount of the raw material on the results, which is outside the listed range.

Table 4: influence of the addition amount of the raw materials beyond the listed ranges on the anti-halation effect

The modified aqueous acrylic resins synthesized by the formulations 12 to 15 in Table 4 have poor anti-halation effect after being formed into a finished ink due to poor mechanical properties of the formed film. After the modified aqueous acrylic resin synthesized by the formulation shown in 16-21 in Table 4 is prepared into finished ink, demulsification phenomenon can occur, and centrifugation is carried out for 30min at 2500/min, so that delamination is serious.

Comparative example 1

38 parts of carbon black color paste

20 parts of ethylene glycol

25 parts of aqueous acrylic resin

Phosphate ester 0.5 part

Xanthan gum 0.5 part

Triethanolamine 0.5 part

Preservative 0.1 min

15.4 parts of deionized water

In the comparative example, water-based acrylic resin is adopted, after the mixture is mixed and stirred according to percentage to prepare a finished product, the test viscosity is 1723mpa.s, the particle size D90 is 296nm, and the test shows that the mixture is centrifuged for 1 hour at 2500r/min, so that the mixture is assembled into a gel-ink pen and is smooth in writing. After writing the handwriting for 2 seconds, the handwriting is stained by using fluorescent strokes, and the anti-halation effect of the fluorescent pen is poor.

Comparative example 2

38 parts of carbon black color paste

Diethylene glycol 20 parts

25 parts of water-based alkyd resin

Phosphate ester 0.5 part

Xanthan gum 0.5 part

Triethanolamine 0.5 part

Preservative 0.1 min

15.4 parts of deionized water

In the comparative example, water-based alkyd resin is adopted, after the mixture is mixed according to percentage to prepare a finished product, the viscosity is 1789mpa.s, the particle size D90 is 268nm, the test is carried out by centrifugation at 2500r/min for 1 hour, no layering phenomenon exists, the aqueous alkyd resin is assembled into a gel pen, the gel pen is hollow in writing, after writing for 2 seconds, the writing is stained by fluorescent strokes, and the effect of preventing the fluorescent pen from being dizziness and dyeing is poor.

Comparative example 3

38 parts of carbon black color paste

20 parts of ethylene glycol

25 parts of water-based polyester modified alkyd resin

Phosphate ester 0.5 part

Xanthan gum 0.6 part

Triethanolamine 0.5 part

Preservative 0.1 min

15.3 parts of deionized water

In the comparative example, the aqueous polyester modified alkyd resin is adopted, the aqueous polyester modified alkyd resin is mixed and stirred according to the percentage to prepare a finished product, the viscosity is 1756mpa.s, the particle size D90 is 273nm, and the aqueous polyester modified alkyd resin is tested by centrifugation at 2500r/min for 1 hour, has no layering phenomenon, is assembled into a gel-ink pen, and is smooth in writing. After writing the handwriting for 2 seconds, the handwriting is scratched by using fluorescent strokes, and the anti-halation effect of the fluorescent pen is poor.

Comparative example 4

38 parts of carbon black color paste

Diethylene glycol 20 parts

25 parts of aqueous polyurethane resin

Phosphate ester 0.5 part

Xanthan gum 0.6 part

Triethanolamine 0.5 part

Preservative 0.1 min

15.3 parts of deionized water

In the comparative example, aqueous polyurethane resin is adopted, after the aqueous polyurethane resin is mixed and stirred according to the medium percentage to prepare a finished product, the viscosity is 1767mpa.s, the particle size D90 is 307nm, the aqueous polyurethane resin is tested by centrifugation at 2500r/min for 1 hour, no layering phenomenon exists, the aqueous polyurethane resin is assembled into a gel-ink pen, and break points are written. After writing the handwriting for 2 seconds, the handwriting is scratched by using fluorescent strokes, and the anti-halation effect of the fluorescent pen is poor.

Comparative example 5

38 parts of carbon black color paste

Diethylene glycol 20 parts

25 parts of styrene maleic anhydride copolymer emulsion

Phosphate ester 0.5 part

Xanthan gum 0.6 part

Triethanolamine 0.5 part

Preservative 0.1 min

15.3 parts of deionized water

The comparative example adopts styrene maleic anhydride copolymer emulsion, and after the copolymer emulsion is mixed and stirred according to percentage to prepare a finished product, the test viscosity is 1744mpa.s, the particle size D90 is 396nm, and the copolymer emulsion is tested by centrifugation at 2500r/min for 1 hour, has no layering phenomenon, is assembled into a gel-ink pen, and has smooth writing. After writing the handwriting for 2 seconds, the handwriting is marked by using fluorescent strokes, and the anti-halation effect of the fluorescent pen is poor.

As can be seen from the above examples, other conventional resins, such as aqueous acrylic resin, aqueous alkyd resin, aqueous polyester modified alkyd resin, aqueous polyurethane resin, have poor anti-halation effect due to insufficient drying speed and water resistance. According to the neutral ink composition for preventing the halation of the fluorescent pen, disclosed by the invention, the wet rubbing fastness is improved by adding a certain amount of polyether modified organosilicon in the synthesis process, and in addition, the quick-drying performance of acrylic resin is greatly improved by adding vinyl silane S210, the defects of low dry speed and poor wet rubbing fastness of the conventional resin are overcome, the writing performance is ensured, the halation preventing capability of the ink is improved, and the applicability is greatly increased.

Comparative example 6

38 parts of carbon black color paste

Diethylene glycol 20 parts

25 parts of aqueous acrylic resin

Phosphate ester 0.5 part

Xanthan gum 0.6 part

Triethanolamine 0.5 part

Polyether modified organosilicon modified 0.5 part

Preservative 0.1 min

14.8 parts of deionized water

In the comparative example, polyether modified organic silicon is not added in the preparation of the water-based acrylic resin, polyether modified organic silicon is directly added in the finished ink product for modification, other components are the same as those in the embodiment, after the finished ink product is prepared by mixing and stirring according to the percentage, the test viscosity is 1805mpa.s, the particle size D90 is 496nm, the layering phenomenon is obvious, the ink is assembled into a gel pen, and writing is smooth. After writing the handwriting for 2 seconds, the handwriting is marked by using fluorescent strokes, and the anti-halation effect of the fluorescent pen is poor.

Comparative example 7

38 parts of carbon black color paste

Diethylene glycol 20 parts

25 parts of aqueous acrylic resin (modified without adding vinyl silane S210)

Phosphate ester 0.5 part

Xanthan gum 0.6 part

Triethanolamine 0.5 part

Vinyl silane S210.8 parts

Preservative 0.1 parts

14.5 parts of deionized water

In the comparative example, vinylsilane S210 is not added for modification in the preparation of the aqueous acrylic resin, vinylsilane S210 is directly added into the finished ink product for modification, other components are the same as those in the embodiment, after the finished ink product is prepared by mixing and stirring according to the percentage, the test viscosity is 1825mpa.s, the particle size D90 is 517nm, the 2500r/min centrifugal test is carried out for 1 hour, the layering phenomenon is obvious, the ink is assembled into a gel pen, and the writing is smooth. After writing the handwriting for 2 seconds, the handwriting is marked by using fluorescent strokes, and the anti-halation effect of the fluorescent pen is poor.

Comparative example 8

38 parts of carbon black color paste

Diethylene glycol 20 parts

25 parts of aqueous acrylic resin (without adding vinylsilane S210 and polyether modified organosilicon modification)

Phosphate ester 0.5 part

Xanthan gum 0.6 part

Triethanolamine 0.5 part

Vinyl silane S210.8 parts

Polyether modified organosilicon modified 0.5 part

Preservative 0.1 parts

14.0 parts of deionized water

In the comparative example, vinylsilane S210 and polyether modified organosilicon are not added in the preparation of the aqueous acrylic resin, but vinylsilane S210 and polyether modified organosilicon are directly added in the finished ink product, other components are the same as those in the embodiment, after the finished ink product is prepared by mixing and stirring according to the medium percentage, the test viscosity is 1811mpa.s, the particle size D90 is 587nm, and the test is performed after centrifugation for 1 hour at 2500r/min, so that the layering phenomenon is obvious, the ink is assembled into a gel pen, and writing is smooth. After writing the handwriting for 2 seconds, the handwriting is marked by using fluorescent strokes, and the anti-halation effect of the fluorescent pen is poor.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A neutral ink composition for preventing halation of a fluorescent pen is characterized by comprising the following raw materials in parts by weight: 25-40 parts of color paste, 10-25 parts of humectant, 15-30 parts of modified film forming resin, 0.1-1 part of lubricant, thickener, pH regulator, preservative and the balance of deionized water; regulating the pH value of the ink to 8.0-8.5 by adopting a pH regulator, wherein the viscosity of the ink product is regulated to 1500-2000 mpa.s by adopting the thickener;

the modified film-forming resin is modified water-based acrylic resin, and is prepared by step-by-step modification of acrylic monomers by polyether modified organosilicon and vinylsilane S210, and comprises the following components:

2. the neutral ink composition for preventing halation of fluorescent pen according to claim 1, wherein the polyether modified silicone is added in an amount of 0.5% of the modified aqueous acrylic resin, and the vinyl silane S210 is added in an amount of 0.8% of the total amount of the modified aqueous acrylic resin.

3. The neutral ink composition for preventing halation of a highlighter according to claim 1, characterized in that the modified aqueous acrylic resin is prepared by the following method:

(a) Mixing and uniformly stirring 20-30 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 1-2 parts of acrylic acid and 1-2 parts of butyl ether acrylamide to obtain a core layer mixed monomer A;

(b) Adding the core layer mixed monomer A, an initiator azo diisobutyl amidine hydrochloride, an emulsifier and deionized water into an emulsifying machine, emulsifying for at least 20min, and then dripping polyether modified organosilicon to obtain a core layer pre-emulsion B;

(c) Adding 20-30 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 1-2 parts of butyl etherified acrylamide, an emulsifying agent and deionized water into an emulsifying machine, emulsifying for at least 30min, dropwise adding vinyl silane S210 while emulsifying, raising the temperature to 80-120 ℃ after the dropwise adding is finished, dropwise adding the core layer pre-emulsion B prepared in the step (B), and preserving the heat for at least 30min after the dropwise adding is finished to obtain a shell layer pre-emulsion C;

(d) And (3) regulating the pH value of the shell layer pre-emulsion C obtained in the step (C) to 7-8 by using a pH regulator, adding an amide ethylene modified amine functional group polymer, and stirring and uniformly mixing to obtain a copolymer emulsion, thus obtaining the modified aqueous acrylic resin.

4. The neutral ink composition for preventing halation of a highlighter pen of claim 1, wherein the color paste is a carbon black paste, a red paste, a blue paste, or a pigment-type paste of other colors.

5. The neutral ink composition for preventing halation of a fluorescent pen according to claim 1, wherein the humectant is one or a combination of several of ethylene glycol, propylene glycol, glycerol, diethylene glycol, polyethylene glycol, sorbitol, 1, 2-hexanediol.

6. The neutral ink composition for preventing halation of a fluorescent pen according to claim 1, wherein the lubricant is one or a combination of several of phosphate, oleic acid, potassium oleate, and sodium oleate.

7. The neutral ink composition for preventing halation of a fluorescent pen according to claim 1, wherein the thickener is selected from one or more of xanthan gum, methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, starch, gelatin, sodium alginate, guar gum, and chitosan.

8. The neutral ink composition for preventing halation of a highlighter pen according to claim 1, wherein the preservative is an aqueous low-toxicity environment-friendly bactericide.

9. The method for preparing the neutral ink composition for preventing halation of fluorescent pen according to claim 1, comprising the following steps:

(a) Mixing 10-25 parts of humectant and 0.1-1 part of lubricant at normal temperature, and stirring;

(b) Sequentially adding preservative and 15-30 parts of modified aqueous acrylic resin while stirring;

(c) Then adding 25-40 parts of color paste, uniformly stirring, and adding a pH regulator to adjust the pH of the ink to 8.0-8.5;

(e) And finally adding a thickening agent to adjust the viscosity, supplementing the balance with deionized water, and uniformly mixing to obtain the finished ink.

10. A gel ink pen refill comprising a cartridge holder and an ink inside the cartridge holder, said ink being a gel ink composition for preventing halation of a highlighter pen according to any one of claims 1 to 9.

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