CN111040178B

CN111040178B - Multifunctional auxiliary agent, preparation method and gel pen ink

Info

Publication number: CN111040178B
Application number: CN201911354442.5A
Authority: CN
Inventors: 郭亨长; 陈爱平; 陈义军; 蒋金涛
Original assignee: East China University of Science and Technology; Shanghai M&G Stationery Inc
Current assignee: East China University of Science and Technology; Shanghai M&G Stationery Inc
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2022-03-29
Anticipated expiration: 2039-12-25
Also published as: CN111040178A

Abstract

The invention discloses a multifunctional auxiliary agent, which is prepared by removing one molecular water through a catalytic condensation reaction between a non-ionic Fluorocarbon Surfactant (FSO) and a non-ionic alkylphenol polyoxyethylene ether surfactant (APEO). The strong polar group hydroxyl in FSO and APEO molecules is removed, and a hydrophilic polyoxyethylene ether chain segment with longer chain length and weaker polarity is constructed by condensation, so that the adverse effects of the effects of hydrogen bond association and the like between the condensate and the pigment dispersant and the thickening system caused by the existence of hydroxyl in a surfactant on the pigment dispersion and thickening system are eliminated, and the condensate can form a larger space network structure with the pigment dispersant and the thickening agent, so that the stability of the pigment dispersion and thickening system is further improved. The obtained condensation compound can be used as a multifunctional auxiliary agent of neutral ink because the condensation compound simultaneously plays the roles of a surface tension regulator, a lubricant and a humectant.

Description

Multifunctional auxiliary agent, preparation method and gel pen ink

Technical Field

The invention belongs to the technical field of stationery, and particularly relates to a multifunctional auxiliary agent for gel ink pen ink.

Background

The medium-viscosity gelatinous water-based pigment ink is called neutral ink for short, and is matched ink of a neutral pen. The gel pen is a new product in ball-point pen products, and is deeply popular with consumers at home and abroad and the market share is continuously improved due to the excellent characteristics of smooth writing, clear handwriting, good color, water resistance, sun resistance, long storage life and the like of the written handwriting.

The neutral ink is prepared through preparing color paste, adding rheological regulator and other functional components, such as surface tension regulator, lubricant, humectant, defoaming agent, corrosion inhibitor, antiseptic, etc. and certain technological process.

The ink can be peeled off from the surface of the writing tool and spread on a writing medium by adjusting the surface tension of the ink, so that the writing is smooth, and the handwriting is easy to permeate and dry; the wetting property of the ink to the pen point can be improved, and the lubricating effect is achieved. In principle, if a gas-liquid interface with reasonable surface tension can be constructed, the volatilization of water in the ink can be inhibited, and the moisturizing effect is achieved, and a surfactant is usually selected to reduce the surface tension of the ink. The viscosity of the neutral ink also has a large influence on its writing performance. The viscosity is too low, the ink writing is smooth, but the problems of penetration, blurred handwriting, ink leakage and the like are caused; if the viscosity is too high, ink leakage, ink spots from the pen point and contamination can be avoided, but problems such as line dryness and broken lines during writing are easily caused. Therefore, it is critical to prepare a neutral ink with excellent performance to adjust the viscosity of the neutral ink within a suitable range and maintain the stability of the viscosity. In fact, the ink often appears pigment and returns thick and flocculation in the long-term storage process, shows that the ink particle size is constantly increased in the storage process, and particle size distribution becomes wide, finally leads to the phenomenon such as pigment settlement and system thickening, has just so directly caused the longer gel ink viscosity of shelf life to increase too greatly for gel-ink pen writes lines dry and writes broken string. The viscosity of the ink can be adjusted to a suitable level by selecting a reasonable surfactant. However, the surfactant tends to have similarity in structure with the pigment dispersant in the mill base and the thickener in the neutral ink, for example, the common commercial nonionic alkylphenol polyoxyethylene ether surfactant (APEO series) and nonionic fluorocarbon surfactant (FSO series) have strong polar group hydroxyl in the molecule, and the hydroxyl can be associated with the hydrogen bond between the pigment dispersant and the thickening system in the mill base, so that the pigment dispersion and the thickening system are unstable.

There is therefore a need for new surfactants that overcome the above-mentioned problems associated with the use of conventional surfactants in ink systems.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide a multifunctional assistant, a preparation method thereof and a neutral ink adopting the multifunctional assistant.

In a first aspect of the present invention, a multifunctional additive is disclosed which can function as a surface tension modifier, a lubricant, a humectant, and the like, and which imparts dispersion and rheological stability and excellent writing performance to a neutral ink.

The multifunctional auxiliary agent of the invention is shown in the following formula (1):

in the formula (I), the compound is shown in the specification,

r is C₂-C₁₈Preferably, R is C₄-C₁₂Alkyl groups of (a);

n₁is an integer of 2 to 50, preferably n₁Is an integer from 4 to 16;

n₂is an integer of 1 to 9, preferably n₂Is an integer from 2 to 6;

n₃is an integer of 3 to 26, preferably n₃Is an integer of 3 to 16.

The invention also provides a preparation method of the multifunctional auxiliary agent, which is specifically prepared by condensation reaction between an alkylphenol ethoxylate surfactant APEO shown in the following formula (2) and a fluorocarbon surfactant FSO shown in the following formula (3) in the presence of a catalyst:

in the formula, R, n₁、n₂And n₃The definition of (A) is as above.

The alkylphenol polyoxyethylene ether surfactant used in the invention is a nonionic surfactant, is polymerized by alkylphenol and ethylene oxide, and has a structural general formula shown in formula (2) and a trade name of APEO. Since the hydrophilic group is composed of a hydroxyl group and an ether bond and only one hydroxyl group is present at the terminal of the molecule, the hydrophilicity is so small that the molecule has sufficient hydrophilicityThe number of molecules n to which ethylene oxide is added must be increased₁That is, the more ether bonds present, the better the hydrophilicity. The hydrophilicity can thus be adjusted by combining different numbers of ethylene oxide molecules. The ethylene oxide addition products generally obtained are all of different degrees of polymerization n₁Mixtures of (A) with (B), usually n₁Is an average value. The active agents currently sold on the market mainly comprise APEO-4, APEO-7, APEO-9, APEO-10, APEO-13, APEO-15, APEO-20, APEO-30, APEO-40 and APEO-50, and the number after APEO represents the number of addition polymerization ethylene oxide, namely n₁The numerical value of (c). Where R is a hydrocarbon alkyl group, such as the six carbon alkyl (hexyl), eight carbon alkyl (octyl) and nine carbon alkyl (nonyl) groups are more common.

The fluorocarbon surfactant used in the invention is also a nonionic surfactant, and has a structural general formula shown in formula (3) and a trade name of FSO. Unlike common surfactant, the nonpolar group is hydrocarbon chain, and the nonpolar group of fluorocarbon surfactant is fluorocarbon chain, that is, fluorine atom is used to replace hydrogen atom on hydrocarbon chain partially or completely, that is, fluorocarbon chain replaces hydrocarbon chain, so the nonpolar group in surfactant not only has hydrophobic property, but also has lubricating property. Fluorocarbon surfactants can significantly reduce the surface tension of aqueous solutions at very low application concentrations.

In the preparation method, the molar ratio of the alkylphenol polyoxyethylene ether surfactant APEO to the fluorocarbon surfactant FSO is 1:2-3:1, preferably 0.9: 1.1.

In the preparation method, the catalyst is a homogeneous reaction catalyst or a heterogeneous reaction catalyst, wherein the homogeneous reaction catalyst is a liquid base catalyst, the heterogeneous reaction catalyst is a solid acid-base catalyst, preferably, the liquid base catalyst is sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, ammonia water or urea, and the solid acid-base catalyst is a molecular sieve, gamma-alumina or sulfonic acid resin.

The reaction pressure of the preparation method of the invention is normal pressure or reduced pressure, and the reaction temperature is 60-160 ℃, preferably 80-140 ℃.

The multifunctional adjuvant of the present invention can be used as a surface tension regulator, a lubricant or a humectant.

The invention also provides gel pen ink which contains the multifunctional auxiliary agent.

The multifunctional auxiliary agent has the following characteristics and beneficial effects:

the strong polar group of hydroxyl in molecules of alkylphenol polyoxyethylene ether surfactant APEO and fluorocarbon surfactant FSO is removed through condensation reaction, so that the adverse effects of common surfactants such as alkylphenol polyoxyethylene ether surfactant APEO and fluorocarbon surfactant FSO on the dispersion stability of the pigment and a rheological thickening system are eliminated, and the neutral ink has better stability.

The multifunctional auxiliary agent is obtained through condensation reaction, the polyoxyethylene ether chain segment is longer, the better hydrophilic and oleophilic matching degree is achieved with the fluorocarbon chain segment, and a larger space network structure is formed with the pigment dispersing agent and the thickening agent, so that the stability of a pigment dispersing and thickening system is further improved.

Compared with alkylphenol ethoxylate surfactant APEO, fluorocarbon surfactant FSO or a compound of the alkylphenol ethoxylate surfactant APEO and the fluorocarbon surfactant FSO, the multifunctional assistant provided by the invention enables the viscosity of the ink to be more stable.

Because the alkylphenol polyoxyethylene ether surfactant APEO and the fluorocarbon surfactant FSO are bonded together through condensation reaction, not only can the various functional effects of the alkylphenol polyoxyethylene ether surfactant APEO and the fluorocarbon surfactant FSO be simultaneously played, such as surface tension regulation, lubrication, wetting, moisture retention and the like, but also the functional effects can be synergistic, and the effect of the multifunctional assistant is further played.

Detailed Description

To illustrate the technical solutions of the present invention more clearly, the following embodiments are further described, but the present invention is not limited thereto, and only some embodiments of the present invention are given.

Example 1

A. Synthesis of multifunctional auxiliary agent

9.8 percent (weight percentage, the same below) of APEO-7 (purchased from Jinan Jieyaku chemical technology Co., Ltd.) with n1 equal to 7 and R being nonane group and 16.1 percent of FSO (purchased from Shanghai Kangwei chemical engineering Co., Ltd., the same below) with n2 equal to 5 and n3 equal to 8 are added into a reaction device, 1.0 percent of sodium carbonate catalyst and 73.1 percent of water solvent are added, condensation reaction is carried out, the reaction temperature is 105 ℃, the reaction time is 2.0 hours under normal pressure stirring and refluxing, after the reaction is finished, 3 percent of hydrochloric acid is used for neutralization to pH 7, evaporation and dehydration are carried out at 102 ℃, and the hydroxyl value in the product is tested to be 5.8 percent of the hydroxyl value before the reaction according to the method A of the national standard GB/T12008.3-89, which shows that the APEO and the FSO have completely reacted, and the product is marked as multifunctional assistant 1.

B. Preparation of neutral ink

Mixing 1.2% (by weight, the same below) of multifunctional assistant 1, 40.0% of color paste (pigment content 20.0%, purchased from Shanghai science and technology Co., Ltd.), 0.12% of xanthan gum dry powder, 0.5% of LD emulsion (xanthan gum and LD emulsion are thickening rheology regulator), 0.5% of oleic acid lubricant, 15.0% of glycerin humectant, 4.5% of isopropanol solvent, 1.8% of triethanolamine pH regulator, 1.0% of iHeir-TQ aqueous mildewproof agent, 1.0% of benzotriazole corrosion inhibitor, 0.3% of DL-3749 defoaming agent and 34.08% of deionized water, slowly stirring, filtering and discharging to obtain the neutral ink.

Example 2

A. Synthesis of multifunctional auxiliary agent

Adding 10.9% of APEO-10 with n1 equal to 10 and R being nonanyl and 14.5% of FSO (the molar ratio of APEO to FSO is 1.08:1) with n2 equal to 5 and n3 equal to 8 into a reaction device, carrying out condensation reaction under the heterogeneous catalysis of 5.0% sulfonic acid resin, wherein the water solvent is 69.6%, the reaction temperature is 125 ℃, stirring and refluxing at normal pressure for 3.0 hours, filtering the sulfonic acid resin after the reaction is finished, evaporating and dehydrating at 102 ℃, testing that the hydroxyl value in the product is 4.1% of the hydroxyl value before the reaction according to the method A of the national standard GB/T12008.3-89, indicating that the APEO and the FSO have completely reacted, and marking the product as multifunctional auxiliary agent 2.

B. Preparation of neutral ink

Mixing 1.0% of multifunctional auxiliary agent 2, 40.0% of color paste, 0.12% of xanthan gum dry powder, 0.5% of LD emulsion (the xanthan gum and the LD emulsion are thickening rheology regulators), 0.5% of oleic acid lubricant, 15.0% of glycerin humectant, 4.5% of isopropanol solvent, 1.8% of triethanolamine pH regulator, 1.0% of iHeir-TQ aqueous mildew inhibitor, 1.0% of benzotriazole corrosion inhibitor, 0.3% of DL-3749 defoaming agent and 34.28% of deionized water, slowly stirring, filtering and discharging to obtain the neutral ink.

Example 3

A. Synthesis of multifunctional auxiliary agent

9.3 percent of n1 is equal to 9, R is APEO-9 of hexanyl and 16.0 percent of FSO (the molar ratio of APEO to FSO is 1.06:1) of n2 is equal to 7 and n3 is equal to 6 are subjected to condensation reaction under the heterogeneous catalysis of 6.0 percent ZSM-5 molecular sieve, the water solvent is 68.7 percent, the reaction temperature is 110 ℃, the pressure reduction stirring reflux reaction time is 2.5 hours, the vacuum degree is 76kPa, after the reaction is finished, the molecular sieve is filtered, evaporation dehydration is carried out at 102 ℃, the hydroxyl value in a test product is 3.2 percent of the hydroxyl value before the reaction according to the method A of the national standard GB/T12008.3-89, which indicates that APEO and FSO are completely reacted, and the product is marked as a multifunctional additive 3.

B. Preparation of neutral ink

Mixing 1.2% of multifunctional auxiliary agent 3, 40.0% of color paste, 0.12% of xanthan gum dry powder, 0.5% of LD emulsion (the xanthan gum and the LD emulsion are thickening rheology regulators), 15.0% of glycerin humectant, 4.5% of isopropanol solvent, 1.8% of triethanolamine pH regulator, 1.0% of iHeir-TQ aqueous mildew preventive, 1.0% of benzotriazole corrosion inhibitor, 0.3% of DL-3749 defoaming agent and 34.58% of deionized water, slowly stirring, filtering and discharging to obtain the neutral ink.

Example 4

A. Synthesis of multifunctional auxiliary agent

7.7 percent of APEO-4 with n1 equal to 4 and R equal to octyl and 21.4 percent of FSO with n2 equal to 6 and n3 equal to 10 (the molar ratio of APEO to FSO is 1.14:1) are subjected to condensation reaction under the liquid phase catalysis of 4.6 percent concentrated ammonia water, the water solvent is 66.2 percent, the reaction temperature is 98 ℃, the reaction time is 1.8 hours under normal pressure stirring reflux, after the reaction is finished, 3 percent hydrochloric acid is used for neutralizing the pH value to be 7, evaporation dehydration is carried out at 102 ℃, the hydroxyl value in the product is 6.8 percent of the hydroxyl value before the reaction according to the method A of the national standard GB/T12008.3-89, the fact that APEO and FSO are completely reacted is shown, and the product is marked as the multifunctional assistant 4.

B. Preparation of neutral ink

0.9% of multifunctional auxiliary agent 4, 40.0% of color paste, 0.12% of xanthan gum dry powder, 0.5% of LD emulsion (the xanthan gum and the LD emulsion are thickening rheology regulators), 7.0% of glycerin humectant, 4.5% of isopropanol solvent, 1.8% of triethanolamine pH regulator, 1.0% of iHeir-TQ aqueous mildew preventive, 1.0% of benzotriazole corrosion inhibitor, 0.3% of DL-3749 defoaming agent and 42.58% of deionized water are mixed, slowly stirred, filtered and discharged to obtain the neutral ink.

Comparative example 1

Mixing 40.0% of color paste, 0.12% of xanthan gum dry powder, 0.5% of LD emulsion (the xanthan gum and the LD emulsion are thickening rheology regulators), 1.5% of SMA (styrene-maleic anhydride resin ammonium salt) surface tension regulator, 0.8% of oleic acid lubricant, 15.0% of glycerin humectant, 4.5% of isopropanol solvent, 1.8% of triethanolamine pH regulator, 1.0% of iHeir-TQ aqueous mildew inhibitor, 1.0% of benzotriazole corrosion inhibitor, 0.3% of DL-3749 defoaming agent and 34.2% of deionized water, slowly stirring, filtering and discharging to obtain the neutral ink. The ink formulation is referred to as an ink base formulation.

Comparative example 2

1.2 percent of n1 equal to 10 and R is nonanyl APEO-10 is used for replacing the multifunctional additive 1 in the ink formula in the example 1 to prepare the neutral ink, and the rest of the ink formula comprises 40.0 percent of color paste, 0.12 percent of xanthan gum dry powder, 0.5 percent of LD emulsion (the xanthan gum and the LD emulsion are thickening rheology regulators), 1.0 percent of SMA (styrene-maleic anhydride resin ammonium salt) surface tension regulator, 0.5 percent of oleic acid lubricant, 15.0 percent of glycerin humectant, 4.5 percent of isopropanol solvent, 1.8 percent of triethanolamine pH regulator, 1.0 percent of iHeir-TQ aqueous mildew inhibitor, 1.0 percent of benzotriazole corrosion inhibitor, 0.3 percent of DL-3749 defoaming agent and 33.08 percent of deionized water, and the neutral ink is obtained after slow stirring, filtering and discharging.

Comparative example 3

1.2% of FSO with n2 equal to 5 and n3 equal to 8 is used for replacing the multifunctional additive 1 in the ink formula in the example 1 to prepare the neutral ink, and the rest of the ink formula comprises 40.0% of color paste, 0.12% of xanthan gum dry powder, 0.5% of LD emulsion (the xanthan gum and the LD emulsion are thickening rheology regulators), 1.0% of SMA (styrene-maleic anhydride resin ammonium salt) surface tension regulator, 0.5% of oleic acid lubricant, 15.0% of glycerin humectant, 4.5% of isopropanol solvent, 1.8% of triethanolamine pH regulator, 1.0% of iHeir-TQ aqueous mildew inhibitor, 1.0% of benzotriazole corrosion inhibitor, 0.3% of DL-3749 defoaming agent and 33.08% of deionized water, and the neutral ink is obtained after slow stirring, filtering and discharging.

Comparative example 4

1.2 percent of n1 equal to 10, APEO-10 with R being nonanyl and n2 equal to 5, and FSO with n3 equal to 6 are used for replacing the multifunctional assistant 1 in the ink formula in the example 1 to prepare the neutral ink according to a molar ratio of 1:1, and the rest ink formula comprises 40.0 percent of color paste, 0.12 percent of xanthan gum dry powder, 0.5 percent of LD emulsion (the xanthan gum and the LD emulsion are thickening rheology regulators), 1.0 percent of SMA (styrene-maleic anhydride resin ammonium salt) surface tension regulator, 0.5 percent of oleic acid lubricant, 15.0 percent of glycerin humectant, 4.5 percent of isopropanol solvent, 1.8 percent of triethanolamine pH regulator, 1.0 percent of iHeir-TQ aqueous mildew inhibitor, 1.0 percent of benzotriazole corrosion inhibitor, 0.3 percent of DL-3749 and 33.08 percent of deionized water, and are mixed, slowly stirred, filtered and discharged to obtain the neutral ink.

Testing the sedimentation stability of the neutral ink: sealing the neutral ink, placing the neutral ink in a 60 ℃ oven for 20 days, taking out the neutral ink for cooling, uniformly stirring for 1 hour, placing 8 ml of the ink in a 10 ml centrifuge tube, centrifuging the ink for 30 minutes at a high rotating speed of 12000 rpm, observing the amount of sediments, classifying the sediments into 3 grades according to the amount of the sediments, wherein the amount of the sediments is good, and the amount of the sediments is very poor, and the average is in the middle.

The gel ink is made into a pen by the same process and pen-making materials, and the performance of the gel ink pen is tested, and the gel ink mainly has moisture retention, writing hand feeling, lubricity, ink leakage and the like.

Moisture retention test: the filled gel ink pen is placed in an oven at 45 ℃ for 60 days after uncapping, taken out and cooled to room temperature, and drawn by hands, the writing performance is classified into 3 grades according to whether the first pen can be drawn out or after drawing out, the first pen can be drawn out and the writing hand feeling is smooth, and the difference is that the first pen cannot be drawn out or the first pen can be drawn out but the writing hand feeling is poor.

And (3) testing ink leakage performance: after the filled gel pen is scratched by hand for about 50 cm, the scratching is stopped, the pen point is kept vertically downwards and stands for 30 minutes, and whether the ink leaks from the first pen is observed. The ink leakage phenomenon of the first pen is classified into 3 grades, the first pen is good when no ink leakage occurs, and the first pen is poor when the ink leakage occurs seriously, and the average is normal.

Hand feeling and lubricity test in writing: and (3) pouring a gel pen by using an oil pipe with the inner diameter of more than or equal to 3.95 mm, drawing a line on a cyclograph for 600 m, and taking off the pen for handwriting to obtain subjective writing hand feeling and lubricity evaluation. The 600-meter line on the cyclograph is full, has no bad phenomena of line breakage, edge deletion and the like, the handwriting hand feeling is smooth after 600 meters, the line is good, the poor record appears after 600 meters of line marking on the cyclograph or the handwriting hand feeling is poor after 600 meters of line marking, and the average is the average.

The properties of the neutral inks of the examples and the comparative examples are shown in Table 1.

TABLE 1 ink Properties

As is clear from the results in Table 1, since APEO has a good effect of adjusting the dynamic viscosity and a good anti-bleeding property, the neutral ink prepared by using APEO alone (comparative example 2) has a good anti-bleeding property, but has poor settling stability, writing touch and lubricity. The use of FSO alone (comparative example 3) was inferior in moisture retention and ink leakage, while the FSO was superior in lubricity and writing touch and lubricity. When APEO and FSO are compounded for use, the viscosity is stable, the ink leakage is good, and the moisture retention is poor. When the neutral ink multifunctional assistant of the present invention (examples 1 and 2) was used in place of the surface tension adjusting agent in the base ink formulation (comparative example 1) and the surface tension adjusting agent and the lubricant in the ink base formulation were simultaneously replaced (example 3), the ink (example 4) prepared even when the surface tension adjusting agent and the lubricant in the ink base formulation were simultaneously replaced and the humectant was greatly reduced had excellent settling stability, moisture retention, ink leakage, writing touch and lubricity. The multifunctional additive for the neutral ink can not only peel off the ink from the surface of the writing tool and spread the ink on a writing medium through the adjustment of the surface tension of the ink, but also lead the writing to be smooth, have no ink leakage and lead the handwriting to be easy to permeate and dry; the wetting property and the lubricity of the ink on the pen point can be improved, the lubricating effect is achieved, the writing hand feeling is smooth, a gas-liquid interface with reasonable surface tension can be constructed, the volatilization of water in the ink is inhibited, and the moisturizing effect is achieved.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims

1. A multifunctional adjuvant of the following formula (1):

in the formula, R is C₂-C₁₈Alkyl of n, n₁Is an integer of 2 to 50, n₂Is an integer of 1 to 9, n₃Is an integer of 3 to 26.

2. The multifunctional adjuvant of claim 1 wherein R is C₄-C₁₂Alkyl of n, n₁Is an integer of 4 to 16, n₂Is an integer of 2 to 6, n₃Is an integer of 3 to 16.

3. A process for the preparation of the multifunctional adjuvant according to any of claims 1-2, characterized in that it is prepared by condensation reaction between alkylphenol ethoxylate surfactant APEO of the following formula (2) and fluorocarbon surfactant FSO of the following formula (3) in the presence of a catalyst:

in the formula, R, n₁、n₂And n₃The definition of (A) is as above.

4. The preparation method of the multifunctional assistant according to claim 3, wherein the molar ratio of the alkylphenol ethoxylate surfactant APEO to the fluorocarbon surfactant FSO is 1:2-3: 1.

5. The method for preparing the multifunctional assistant according to claim 4, wherein the molar ratio of the alkylphenol ethoxylate surfactant APEO to the fluorocarbon surfactant FSO is 0.9: 1.1.

6. The method for preparing the multifunctional assistant according to claim 3, wherein the catalyst is a homogeneous reaction catalyst or a heterogeneous reaction catalyst, wherein the homogeneous reaction catalyst is a liquid base catalyst, and the heterogeneous reaction catalyst is a solid acid-base catalyst.

7. The method of claim 6, wherein the liquid base catalyst is sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, ammonia water or urea.

8. The method for preparing the multifunctional assistant according to claim 6, wherein the solid acid-base catalyst is a molecular sieve, gamma-alumina or a sulfonic acid resin.

9. The process for preparing a multifunctional assistant according to claim 3, wherein the reaction pressure is normal pressure or reduced pressure, and the reaction temperature is 60 to 160 ℃.

10. The method of claim 9, wherein the reaction temperature is 80-140 ℃.

11. Use of a multifunctional adjuvant according to any of claims 1-2 as a surface tension regulator, lubricant or humectant.

12. A gel pen ink comprising the multifunctional assistant according to any one of claims 1 to 2.