CN116694271A - Water-based adhesive and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of adhesives, and in particular discloses a water-based adhesive and a preparation method thereof, wherein the water-based adhesive comprises the following raw materials in parts by mass: 42-65 parts of modified aqueous acrylic emulsion, 5-12 parts of beta-cyclodextrin, 3-7 parts of chitosan, 2-5 parts of guar gum, 4-6 parts of cross-linking agent, 1-2 parts of anti-aging agent, 0.5-2 parts of pH regulator and 15-25 parts of deionized water, wherein the modified aqueous acrylic emulsion is prepared from methyl methacrylate, ethyl acrylate, 2-hydroxyethyl methacrylate, modified titanium dioxide, initiator and deionized water serving as raw materials, the water-based adhesive does not contain an organic solvent, does not contain formaldehyde, has good fluidity and chemical stability, has excellent bonding strength, can be widely applied to the fields of close and human life such as home decoration, artificial boards and the like, is basically harmless to the environment and human body, has simple process and low cost, and simultaneously has excellent antibacterial performance.

Description

A kind of water-based adhesive and preparation method thereof

technical field

The invention relates to the technical field of adhesives, in particular to a water-based adhesive and a preparation method thereof.

Background technique

Adhesives belong to organic polymer compounds. Through interfacial adhesion and cohesion, two or more materials are bonded together. With the development of science and technology, various multifunctional and high-performance adhesives are widely used in modern industries. It has been widely used in the field, and has become an indispensable material for modern industry and defense industry. Most of the traditional adhesives are still based on petroleum-based solvents such as urea-formaldehyde resin and phenolic resin. This type of adhesive has excellent bonding performance and low price, but it will release toxic substances such as formaldehyde, which seriously harms Human health and pollution of the environment. Environmental protection has become a hot topic in the adhesive industry. The development of low-toxic and non-toxic adhesives has become the mainstream, and water-based and solvent-free adhesives have become the mainstream development direction.

Water-based adhesives have the advantages of no solvent, no odor, no pollution, good moldability, strong adhesion, etc., and are more and more widely used in the decoration industry, furniture industry, automobile industry and other fields. Chinese patent CN105176442B discloses an environmentally friendly adhesive, which includes 20-40 parts of polyisoprene, 15-30 parts of polyvinyl alcohol, 15-30 parts of polyacrylamide, 10-22 parts of butanol, 12-25 parts of methyl hydroxyethyl cellulose, 8-12 parts of boric acid, 5-12 parts of 2,6-tertiary butyl-4-methylphenol, 8-14 parts of sodium monofluorophosphate, 10 parts of silicone resin -15 parts, 5-9 parts of modified sodium lauryl sulfate, 5-9 parts of puffed glutinous rice flour, 3-5 parts of urea, 15-30 parts of deionized water, formaldehyde-free, non-toxic and tasteless, simple production process , has excellent adhesion and good construction, strong adhesion, high strength, no cracking, waterproof, good alkali resistance, simple construction, easy to scrape, easy to polish, but when the temperature, humidity, moisture When the conditions are suitable, the adhesive will inevitably become the best place for bacteria, mold and other fungi to breed, which will not only reduce the service life of the adhesive, but also seriously affect the bonding ability between the two materials . Therefore, the development of water-based adhesives with certain antibacterial properties has become one of the hot spots in the development of adhesives today.

Contents of the invention

In order to solve the above technical problems, the present invention provides a water-based adhesive and a preparation method thereof. The water-based adhesive prepared by the method has good adhesion, is environmentally friendly, and has excellent antibacterial effect.

In order to achieve the above object, the present invention discloses a water-based adhesive, comprising the following raw materials in parts by mass: 42-65 parts of modified water-based acrylic emulsion, 5-12 parts of β-cyclodextrin, 3-7 parts of chitosan 2-5 parts of guar gum, 4-6 parts of cross-linking agent, 1-2 parts of antioxidant, 0.5-2 parts of pH regulator, 15-25 parts of deionized water;

The modified water-based acrylic emulsion is prepared by using methyl methacrylate, ethyl acrylate, 2-hydroxyethyl methacrylate, modified titanium dioxide, initiator and deionized water as raw materials.

Preferably, the crosslinking agent includes any one of butane tetracarboxylic acid and citric acid.

Preferably, the anti-aging agent includes 2-mercaptobenzimidazole zinc salt, 2,6-di-tert-butyl-p-cresol, N-(p-toluenesulfonamide)-N'-phenyl-p-phenylenediamine any kind.

Preferably, the modified water-based acrylic emulsion comprises the following steps:

Step 1. Disperse nano-titanium dioxide in anhydrous toluene. After the ultrasonic dispersion is uniform, add 3-chloropropyl triethoxysilane, heat and stir, and react. After the reaction, cool and centrifuge. The speed of centrifugation is 6000r/ min, centrifuged for 12 minutes, washed with dichloromethane, and dried in vacuum at 60°C for 12 hours to obtain titanium dioxide chloride;

Step 2. Ultrasonic disperse titanium dioxide chloride into acetone. After the ultrasonic dispersion is uniform, add diethylaminoethyl methacrylate to react. After the reaction, filter, wash with ethanol, and dry in a drying oven at 50-60°C 12-24h to obtain modified titanium dioxide;

Step 3, mix methyl methacrylate, ethyl acrylate, 2-hydroxyethyl methacrylate and deionized water evenly to obtain a pre-emulsion, then add modified titanium dioxide and initiator, stir and mix, heat, and React at 75-85°C for 2-3 hours. After the reaction, a modified water-based acrylic emulsion is obtained.

Further, the mass ratio of nano-titanium dioxide, anhydrous toluene and 3-chloropropyltriethoxysilane in the step 1 is 100:6000-7500:125-155.

Further, the reaction temperature in the step 1 is 90-105°C, and the reaction time is 24-32h.

Further, the mass ratio of titanium dioxide chloride, acetone and diethylaminoethyl methacrylate in the step 2 is 100:2000-2800:55-70.

Further, the reaction temperature in the second step is 35-45° C., and the reaction time is 5-8 hours.

Further, the mass ratio of methyl methacrylate, ethyl acrylate, 2-hydroxyethyl methacrylate, modified titanium dioxide, initiator and deionized water in the step 3 is 45-80:30-50: 15-30:9-20:0.5-1.2:240-320.

Further, the initiator in the step three includes any one of potassium persulfate, ammonium persulfate and sodium persulfate.

Preferably, the preparation method of described water-based adhesive comprises the following steps:

Add β-cyclodextrin, chitosan, and guar gum into deionized water, heat, stir and mix at 50-60°C, the stirring speed is 65-75r/min, after stirring evenly, add modified water-based The acrylic emulsion, crosslinking agent and anti-aging agent are stirred and mixed at 70-80°C for 1-2 hours. After mixing, the pH is adjusted to 7-8 with a pH regulator, and cooled to obtain a water-based adhesive.

Preferably, the pH regulator includes any one of potassium carbonate, sodium carbonate, and sodium acetate.

In the present invention, 3-chloropropyltriethoxysilane is used to modify nano-titanium dioxide, introduce chlorine atoms on the surface of nano-titanium dioxide, obtain chlorinated titanium dioxide, and quaternize chlorinated titanium dioxide and diethylaminoethyl methacrylate reaction, introduce quaternary ammonium salt on the surface of nano-titanium dioxide, and introduce carbon-carbon double bond at the same time to obtain modified titanium dioxide, methyl methacrylate, ethyl acrylate, 2-hydroxyethyl methacrylate and modified titanium dioxide in the initiator Under the action, a polymerization reaction occurs to obtain a modified water-based acrylic emulsion, which effectively avoids the agglomeration of nano-titanium dioxide. Mix the coupling agent and anti-aging agent evenly, and adjust the pH to obtain a water-based adhesive.

Compared with prior art, the beneficial effect of the present invention is:

The water-based acrylic emulsion used in the present invention has excellent fluidity, can effectively improve the dispersion and fluidity of the water-based adhesive, and has good chemical stability, excellent mechanical properties, and good bonding performance. After adding an anti-aging agent, Has better weather resistance, 2-hydroxyethyl methacrylate contains hydroxyl groups, β-cyclodextrin, chitosan, and guar gum also contain a large number of hydroxyl groups, water-based acrylic emulsion and β-cyclodextrin, Under the action of cross-linking agent, chitosan and guar gum form a tight network skeleton after cross-linking, which effectively improves the bonding strength of the adhesive. β-cyclodextrin, chitosan and guar gum can be used as The adhesive can also be used as a thickener, and the obtained water-based adhesive has good stability and good fluidity, and the nano-titanium dioxide added in it can further enhance the mechanical properties of the adhesive, and the network skeleton structure can effectively reduce It prevents the intrusion of water molecules and causes damage, and improves the water resistance of the adhesive.

The nano-titanium dioxide added to the water-based acrylic emulsion of the present invention has a small size effect and photocatalytic activity. After contacting with bacteria, it kills the bacteria. It can also decompose the organic nutrients needed by the mold to survive, making it difficult for the bacteria to survive and cause cell apoptosis. The quaternary ammonium salt introduced on the surface of the nano-titanium dioxide has a positive charge and can be adsorbed on the surface of the negatively charged bacteria through positive ions. Through penetration and diffusion, the permeability of the bacterial cell wall is changed, and the protease required for survival cannot be produced, which kills the bacteria. Chitosan has a spectrum of antibacterial properties, which effectively inhibits the growth and reproduction of bacteria. The prepared water-based adhesive agent has excellent antibacterial properties.

The water-based adhesive prepared in the present invention does not contain organic solvents, and does not contain formaldehyde in the adhesive. It has excellent bonding strength and can be widely used in home decoration and artificial boards and other fields closely related to human life. It is basically harmless to the environment and the human body. It is a green and environmentally friendly adhesive with simple process and low cost. It also has excellent antibacterial properties, which can effectively prevent bacterial growth and reduce the service life of the adhesive.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Embodiments, and all other embodiments obtained by persons of ordinary skill in the art without creative efforts, all belong to the scope of protection of the present invention.

Example 1

A preparation method of water-based adhesive, comprising the following steps:

Add 5 parts by mass of β-cyclodextrin, 3 parts of chitosan, and 2 parts of guar gum to 15 parts of deionized water, heat, stir and mix at 50°C, and the stirring speed is 75r/min After stirring and mixing evenly, add 42 parts of modified water-based acrylic emulsion, 4 parts of cross-linking agent butane tetracarboxylic acid and 1 part of anti-aging agent 2,6-di-tert-butyl-p-cresol, and stir at 70 ° C Mix for 2 hours. After mixing, use 0.5 part of pH regulator sodium acetate to adjust the pH to 7, and cool to obtain a water-based adhesive.

Wherein the modified water-based acrylic emulsion comprises the following steps to prepare:

Step 1. Disperse 10g of nano-titanium dioxide into 600g of anhydrous toluene. After the ultrasonic dispersion is uniform, add 12.5g of 3-chloropropyltriethoxysilane, heat and stir, and react at 90°C. The reaction time is After 32 hours, after the reaction, cool and centrifuge at a rate of 6000 r/min for 12 minutes, wash with dichloromethane, and vacuum dry at 60° C. for 12 hours to obtain titanium dioxide chloride;

Step 2. Ultrasonic disperse 5g of titanium dioxide chloride into 100g of acetone. After the ultrasonic dispersion is uniform, add 2.75g of diethylaminoethyl methacrylate and react at 35°C. The reaction time is 8h. , filtered, washed with ethanol, and dried in a drying oven at 50°C for 24 hours to obtain modified titanium dioxide;

Step 3. Mix 9g of methyl methacrylate, 6g of ethyl acrylate, 3g of 2-hydroxyethyl methacrylate and 48g of deionized water to obtain a pre-emulsion, and then add 1.8g of modified Titanium dioxide and 0.1 g of initiator potassium persulfate were stirred and mixed, heated, and reacted at 75° C. for 3 hours. After the reaction, a modified water-based acrylic emulsion was obtained.

Example 2

A preparation method of water-based adhesive, comprising the following steps:

Add 8 parts by mass of β-cyclodextrin, 4.5 parts of chitosan, and 3 parts of guar gum into 18 parts of deionized water, heat, stir and mix at 55°C, and the stirring speed is 70r/min After stirring and mixing evenly, add 50 parts of modified water-based acrylic emulsion, 4.8 parts of cross-linking agent butane tetracarboxylic acid and 1.4 parts of anti-aging agent 2,6-di-tert-butyl-p-cresol, and stir at 75 ° C Mix for 1.5 hours. After mixing, use 1.2 parts of pH regulator sodium acetate to adjust the pH to 7.5, and cool to obtain a water-based adhesive.

Wherein the modified water-based acrylic emulsion comprises the following steps to prepare:

Step 1. Disperse 10g of nano-titanium dioxide into 700g of anhydrous toluene. After the ultrasonic dispersion is uniform, add 14g of 3-chloropropyltriethoxysilane, heat and stir, and react at 100°C. The reaction time is 30h , after the reaction, cooling and centrifuging, the centrifugation rate is 6000r/min, the centrifugation time is 12min, washed with dichloromethane, and vacuum-dried at 60°C for 12h to obtain titanium dioxide chloride;

Step 2. Ultrasonic disperse 5g of titanium dioxide chloride into 125g of acetone. After the ultrasonic dispersion is uniform, add 3.2g of diethylaminoethyl methacrylate and react at 40°C. The reaction time is 7h. , filtered, washed with ethanol, and dried in a drying oven at 55°C for 18 hours to obtain modified titanium dioxide;

Step 3, mix 13g of methyl methacrylate, 8g of ethyl acrylate, 5g of 2-hydroxyethyl methacrylate and 55g of deionized water to obtain a pre-emulsion, then add 3g of modified titanium dioxide Stir and mix with 0.2 g of initiator potassium persulfate, heat, and react at 80° C. for 2.5 hours. After the reaction, a modified water-based acrylic emulsion is obtained.

Example 3

A preparation method of water-based adhesive, comprising the following steps:

Add 10 parts by mass of β-cyclodextrin, 6 parts of chitosan, and 4 parts of guar gum to 22 parts of deionized water, heat, stir and mix at 55°C, and the stirring speed is 70r/min After stirring and mixing evenly, add 60 parts of modified water-based acrylic emulsion, 5.5 parts of cross-linking agent butane tetracarboxylic acid and 1.8 parts of anti-aging agent 2,6-di-tert-butyl-p-cresol, and stir at 75 ° C Mix for 1.5 hours. After mixing, use 1.8 parts of pH regulator sodium acetate to adjust the pH to 7.5, and cool to obtain a water-based adhesive.

Wherein the modified water-based acrylic emulsion comprises the following steps to prepare:

Step 1. Disperse 10g of nano-titanium dioxide into 700g of anhydrous toluene. After the ultrasonic dispersion is uniform, add 14g of 3-chloropropyltriethoxysilane, heat and stir, and react at 100°C. The reaction time is 30h , after the reaction, cooling and centrifuging, the centrifugation rate is 6000r/min, the centrifugation time is 12min, washed with dichloromethane, and vacuum-dried at 60°C for 12h to obtain titanium dioxide chloride;

Step 2. Ultrasonic disperse 5g of titanium dioxide chloride into 125g of acetone. After the ultrasonic dispersion is uniform, add 3.2g of diethylaminoethyl methacrylate and react at 40°C. The reaction time is 7h. , filtered, washed with ethanol, and dried in a drying oven at 55°C for 18 hours to obtain modified titanium dioxide;

Step 3, mix 13g of methyl methacrylate, 8g of ethyl acrylate, 5g of 2-hydroxyethyl methacrylate and 55g of deionized water to obtain a pre-emulsion, then add 3g of modified titanium dioxide Stir and mix with 0.2 g of initiator potassium persulfate, heat, and react at 80° C. for 2.5 hours. After the reaction, a modified water-based acrylic emulsion is obtained.

Example 4

A preparation method of water-based adhesive, comprising the following steps:

Add 12 parts by mass of β-cyclodextrin, 7 parts of chitosan, and 5 parts of guar gum into 25 parts of deionized water, heat, stir and mix at 60°C, and the stirring speed is 65r/min , after stirring and mixing evenly, add 65 parts of modified water-based acrylic emulsion, 6 parts of crosslinking agent butane tetracarboxylic acid and 2 parts of anti-aging agent 2,6-di-tert-butyl p-cresol, and stir at 80 ° C Mix for 1 hour. After mixing, use 2 parts of pH regulator sodium acetate to adjust the pH to 8, and cool to obtain a water-based adhesive.

Wherein the modified water-based acrylic emulsion comprises the following steps to prepare:

Step 1. Disperse 10g of nano-titanium dioxide into 750g of anhydrous toluene. After the ultrasonic dispersion is uniform, add 15.5g of 3-chloropropyltriethoxysilane, heat and stir, and react at 105°C. The reaction time is After 24 hours, after the reaction, cool and centrifuge at a rate of 6000 r/min for 12 minutes, wash with dichloromethane, and dry in vacuum at 60°C for 12 hours to obtain titanium dioxide chloride;

Step 2. Ultrasonic disperse 5g of titanium dioxide chloride into 140g of acetone. After the ultrasonic dispersion is uniform, add 3.5g of diethylaminoethyl methacrylate and react at 45°C. The reaction time is 5h. , filtered, washed with ethanol, and dried in a drying oven at 60°C for 12 hours to obtain modified titanium dioxide;

Step 3, mix 16g of methyl methacrylate, 10g of ethyl acrylate, 6g of 2-hydroxyethyl methacrylate and 64g of deionized water to obtain a pre-emulsion, then add 4g of modified titanium dioxide Stir and mix with 0.24 g of initiator potassium persulfate, heat, and react at 85° C. for 2 hours. After the reaction, a modified water-based acrylic emulsion is obtained.

Comparative example 1

A preparation method of water-based adhesive, comprising the following steps:

Add 10 parts by mass of β-cyclodextrin, 6 parts of chitosan, and 4 parts of guar gum to 22 parts of deionized water, heat, stir and mix at 55°C, and the stirring speed is 70r/min After stirring and mixing evenly, add 60 parts of modified water-based acrylic emulsion, 5.5 parts of cross-linking agent butane tetracarboxylic acid and 1.8 parts of anti-aging agent 2,6-di-tert-butyl-p-cresol, and stir at 75 ° C Mix for 1.5 hours. After mixing, use 1.8 parts of pH regulator sodium acetate to adjust the pH to 7.5, and cool to obtain a water-based adhesive.

Wherein the modified water-based acrylic emulsion comprises the following steps to prepare:

Step 1. Disperse 10g of nano-titanium dioxide into 700g of anhydrous toluene. After the ultrasonic dispersion is uniform, add 14g of γ-methacryloxypropyltrimethoxysilane, heat and stir, and react at 100°C. The reaction time is 30 hours. After the reaction is completed, cool and centrifuge at a rate of 6000 r/min, and the centrifugation time is 12 minutes. Wash with dichloromethane and vacuum dry at 60° C. for 12 hours to obtain alkenylated titanium dioxide;

Step 2. Mix 13g of methyl methacrylate, 8g of ethyl acrylate, 5g of 2-hydroxyethyl methacrylate and 55g of deionized water to obtain a pre-emulsion, and then add 3g of alkenyl Titanium dioxide and 0.2 g of initiator potassium persulfate were stirred and mixed, heated, and reacted at 80° C. for 2.5 hours. After the reaction, a modified water-based acrylic emulsion was obtained.

Comparative example 2

A preparation method of water-based adhesive, comprising the following steps:

80 parts by mass of modified water-based acrylic emulsion, 5.5 parts of crosslinking agent butane tetracarboxylic acid and 1.8 parts of anti-aging agent 2,6-di-tert-butyl-p-cresol were stirred and mixed at 75°C for 1.5h, After mixing, use 1.8 parts of pH regulator sodium acetate to adjust the pH to 7.5, and cool to obtain a water-based adhesive.

Wherein the modified water-based acrylic emulsion comprises the following steps to prepare:

Step 1. Disperse 10g of nano-titanium dioxide into 700g of anhydrous toluene. After the ultrasonic dispersion is uniform, add 14g of 3-chloropropyltriethoxysilane, heat and stir, and react at 100°C. The reaction time is 30h , after the reaction, cooling and centrifuging, the centrifugation rate is 6000r/min, the centrifugation time is 12min, washed with dichloromethane, and vacuum-dried at 60°C for 12h to obtain titanium dioxide chloride;

Step 2. Ultrasonic disperse 5g of titanium dioxide chloride into 125g of acetone. After the ultrasonic dispersion is uniform, add 3.2g of diethylaminoethyl methacrylate and react at 40°C. The reaction time is 7h. , filtered, washed with ethanol, and dried in a drying oven at 55°C for 18 hours to obtain modified titanium dioxide;

Step 3, mix 13g of methyl methacrylate, 8g of ethyl acrylate, 5g of 2-hydroxyethyl methacrylate and 55g of deionized water to obtain a pre-emulsion, then add 3g of modified titanium dioxide Stir and mix with 0.2 g of initiator potassium persulfate, heat, and react at 80° C. for 2.5 hours. After the reaction, a modified water-based acrylic emulsion is obtained.

Carry out performance test to the water-based adhesive prepared in embodiment 1-4 and comparative example 1-2, test is as follows:

(1) Bonding strength test: conduct experiments with reference to the provisions of the national standard GB/T 9846-2015 "Ordinary Plywood" in Class II plywood, and carry out bonding strength tests on Examples 1-4 and Comparative Examples 1-2, each with three layers Eight test specimens were sawn from plywood, the size was 100×25mm, and the glued area of the specimens was 25×25mm ² ;

(2) antibacterial performance test: adopt colony counting method to measure the antibacterial effect of water-based adhesive in embodiment 1-4 and comparative example 1-2 to Escherichia coli, add the meat extract peptone agar medium after the sterilization In the flat petri dish, cover and pave, spread 1.5×10 ⁵ CFU/mL E. coli suspension on the culture medium to form a bacterial liquid film, and use the water-based glue in Example 1-4 and Comparative Example 1-2 Add the adhesive to the culture dish respectively, place the culture dish in a constant temperature incubator at room temperature of 37°C for 24 hours, record the total number of colonies, and calculate the inhibition rate (%) = (initial colony concentration - colony concentration after cultivation) ÷ initial colony concentration ×100%;

The test results are shown in Table 1:

Table 1

According to the test results in Table 1, it can be seen that Examples 1-4 have excellent adhesive properties, and as the content of the added viscous components increases, the adhesive strength tends to increase, and the water-based adhesive corresponding to Example 3 The bonding strength to type II plywood can reach 1.83MPa. Comparative Example 1 uses γ-methacryloxypropyltrimethoxysilane to modify nano-titanium dioxide to obtain alkenylated titanium dioxide, which can still undergo polymerization to obtain a modified water-based acrylic resin, which has no effect on the bonding strength. Impact, and there is a certain upward trend, which is 1.87MPa. In Comparative Example 2, no β-cyclodextrin, chitosan and guar gum were added, and the bonding strength was greatly reduced, which was 1.14MPa. Embodiment 1-4 has excellent bacteriostasis performance, and wherein embodiment 4 can reach 97.67% to the bacteriostasis rate of escherichia coli, does not introduce organic antibacterial agent quaternary ammonium salt in comparative example 1, and antibacterial performance reduces greatly, but nano-titanium dioxide has Certain antibacterial effect, antibacterial rate is 75.32%, do not add β-cyclodextrin, chitosan and guar gum in comparative example 2, chitosan has excellent antibacterial effect, and nano titanium dioxide and quaternary ammonium salt have Good synergistic antibacterial effect, the antibacterial effect is reduced, and the antibacterial rate is 90.68%.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still belong to the scope covered by the patent of the present invention.

Claims (9)

1. A water-based adhesive is characterized in that: the material comprises the following raw materials in parts by mass: 42-65 parts of modified aqueous acrylic emulsion, 5-12 parts of beta-cyclodextrin, 3-7 parts of chitosan, 2-5 parts of guar gum, 4-6 parts of cross-linking agent, 1-2 parts of anti-aging agent, 0.5-2 parts of pH regulator and 15-25 parts of deionized water;

the modified aqueous acrylic emulsion is prepared from methyl methacrylate, ethyl acrylate, 2-hydroxyethyl methacrylate, modified titanium dioxide, an initiator and deionized water.

2. The water-based adhesive according to claim 1, wherein: the cross-linking agent comprises any one of butane tetracarboxylic acid and citric acid.

3. The water-based adhesive according to claim 1, wherein: the anti-aging agent comprises any one of zinc salt of 2-mercaptobenzimidazole, 2, 6-di-tert-butyl-p-cresol and N- (p-toluenesulfonamido) -N' -phenyl p-phenylenediamine.

4. The water-based adhesive according to claim 1, wherein: the modified aqueous acrylic emulsion is prepared by the following steps:

dispersing nano titanium dioxide into anhydrous toluene, adding 3-chloropropyl triethoxysilane after ultrasonic dispersion is uniform, heating and stirring to react, cooling, centrifuging at 6000r/min for 12min, washing with dichloromethane, and vacuum drying at 60 ℃ for 12h to obtain chlorinated titanium dioxide;

dispersing titanium dioxide chloride into acetone by ultrasonic waves, adding diethylaminoethyl methacrylate after uniform ultrasonic dispersion, reacting, filtering after the reaction is finished, washing by using ethanol, and drying in a drying oven at 50-60 ℃ for 12-24 hours to obtain modified titanium dioxide;

step three, uniformly mixing methyl methacrylate, ethyl acrylate, 2-hydroxyethyl methacrylate and deionized water to obtain a pre-emulsion, adding modified titanium dioxide and an initiator, stirring and mixing, heating, reacting for 2-3h at 75-85 ℃, and obtaining the modified aqueous acrylic emulsion after the reaction is finished.

5. The water-based adhesive according to claim 1, wherein: in the second step, the mass ratio of the chlorinated titanium dioxide, the acetone and the diethylaminoethyl methacrylate is 100:2000-2800:55-70.

6. The water-based adhesive according to claim 1, wherein: in the step three, the mass ratio of the methyl methacrylate to the ethyl acrylate to the 2-hydroxyethyl methacrylate to the modified titanium dioxide to the initiator to the deionized water is 45-80:30-50:15-30:9-20:0.5-1.2:240-320.

7. The water-based adhesive according to claim 1, wherein: and in the third step, the initiator comprises any one of potassium persulfate, ammonium persulfate and sodium persulfate.

8. A method of preparing the water-based adhesive according to any one of claims 1 to 7, wherein: the method comprises the following steps: adding beta-cyclodextrin, chitosan and guar gum into deionized water, heating, stirring and mixing at 50-60 ℃, stirring and mixing at the rotation speed of 65-75r/min, adding modified aqueous acrylic emulsion, a cross-linking agent and an anti-aging agent after stirring and mixing uniformly, stirring and mixing at 70-80 ℃ for 1-2h, regulating the pH to 7-8 by using a pH regulator, and cooling to obtain the water-based adhesive.

9. The method for preparing the water-based adhesive according to claim 8, wherein the method comprises the following steps: the pH regulator comprises any one of potassium carbonate, sodium carbonate and sodium acetate.