CN108203570B - Water-based ultrahigh-speed spraying nozzle connecting glue and preparation method thereof - Google Patents

Abstract

The invention discloses a water-based ultrahigh-speed spray nozzle adhesive and a preparation method thereof, wherein polyvinyl alcohol is used as a protective colloid, isomeric alcohol polyoxyethylene ether is used as an emulsifier to prepare vinyl acetate, methyl methacrylate and acrylic acid ternary copolymer emulsion, the fluidity and the cohesiveness are further improved by adding a plasticizer and a polyvinyl alcohol aqueous solution, the residual vinyl acetate monomer is effectively reduced by adopting a mode of stirring at a higher temperature and vacuumizing, and deionized water is used for adjusting the viscosity to prepare the ultrahigh-speed spray nozzle adhesive suitable for a spray gluing cigarette making machine set. The invention does not use alkylphenol polyoxyethylene ether emulsifier which causes accumulation damage to human body, the produced nozzle angle has higher paper adhesive force and extremely fast drying speed on the premise of low viscosity and low solid content, can realize stable and uniform glue supply on a spraying gluing cigarette unit with the machine speed of 20000/min, and the produced cigarettes have no bad phenomena of air leakage, turning, bubble wrinkle and the like and have extremely low rejection rate.

Description

Water-based ultrahigh-speed spraying nozzle connecting glue and preparation method thereof

Technical Field

The invention relates to a polymer adhesive, in particular to a nozzle connecting adhesive for water-based ultrahigh-speed spraying, which is suitable for the cigarette industry.

Background

The filter tip glue is an important cigarette material for connecting cigarettes and filter tips, and the using amount of the filter tip glue is the largest of all water-based cigarette glue, including lap glue for cigarettes, packing glue, filter stick forming middle line glue and the like. In the cigarette production process, the cigarette rolling and connecting device plays a very important role in the rolling and connecting quality of cigarettes. At present, the gluing modes of the nozzle glue mainly comprise roll coating gluing and spray coating gluing, and the performance requirements of different gluing modes on the nozzle glue are different. Firstly, under the same rolling speed, compared with a roller coating gluing mode, the drying speed of glue required by spraying gluing is more appropriate. Secondly, different sizing methods have different requirements on the rheological property of the nozzle glue, and the glue for roller coating is used for preventing the glue solution from splashing to obtain uniform gluing effect and bonding effect, and generally the glue solution is required to have smaller shear thinning phenomenon and maintain higher viscosity under the action of high-speed shearing; the spraying glue needs better shear thinning capability so as to meet the requirements that the spraying glue can continuously and uniformly spray glue liquid under lower pressure in the pumping process and does not block a nozzle. Thirdly, the requirements on the conventional physical indexes of the glue are different, and the glue for roller coating is usually higher in initial viscosity and solid content for the purpose of ensuring that the glue still has higher viscosity after high-speed shearing so as to improve the binding power and obtaining higher drying speed by utilizing the high solid content of the glue; compared with the prior spraying glue, the spraying glue has the advantages that the stable glue supply is ensured, the general viscosity and the solid content are low, the bonding force is improved by increasing the permeability and changing the bonding force between the raw material and the paper, and the proper drying speed is ensured.

With the continuous introduction of domestic high-speed cigarette making machines, the cigarette rolling and connecting speed is greatly increased from 6000 cigarettes/min to over 20000 cigarettes/min, and the traditional cigarette connecting glue production technology cannot meet the requirements of high-speed cigarette making machines. In recent years, domestic cigarette adhesive production enterprises are continuously invested in developing new ultra-high-speed cigarette adhesive production technologies, and achieve remarkable performances. However, the ultra-high speed cigarette making machine unit introduced in the early period mainly adopts roller coating and gluing, the technical development of each enterprise is mainly focused on adapting to the roller coating type ultra-high speed cigarette making machine unit, the developed new products are also focused on the aspect of the nozzle glue for roller coating, the attention on the high-speed cigarette making machine unit suitable for spraying and gluing is low, and even a piece of domestic patent information about the nozzle glue for spraying is difficult to see. The application difference which can exist between two different gluing modes is objective, the product requirements of the nozzle glue developed aiming at the two gluing modes are different, and the newly developed ultrahigh-speed nozzle glue suitable for roll coating gluing can generate various adverse reactions such as unstable glue spraying, easy nozzle blockage, improper (slow or fast) drying speed, bubble wrinkle, turning around, high rejection rate and the like when being directly applied to an ultrahigh-speed spraying cigarette making machine set.

Patent application CN201610020398.4 discloses an ultrahigh-speed cigarette nozzle adhesive and a preparation method thereof, wherein the ultrahigh-speed cigarette nozzle adhesive is mainly prepared by mixing VAE emulsion, polyvinyl alcohol, a plasticizer, a mineral oil type defoaming agent and a preservative. The solid content of the adhesive reaches 48-52%, and the beneficial effect pursued by the adhesive is that the adhesive is not scattered under high-speed shearing suitable for roller coating and gluing, so the nozzle adhesive can reach the rolling connection speed of 20000 counts/minute, but can not be suitable for cigarette making units with ultra-high-speed spraying and gluing.

The patent CN102181243B discloses a water-based ultrahigh-speed cigarette nozzle adhesive and a preparation method thereof, wherein the ultrahigh-speed nozzle adhesive is prepared by polymerizing a ternary copolymer emulsion by using vinyl acetate, butyl acrylate and acrylic acid ternary monomers and using OP-10 as an emulsifier under the action of an ammonium persulfate-sodium bisulfite composite initiator, and then adding a plasticizer and vacuumizing, wherein the ultrahigh-speed nozzle adhesive has the viscosity of 2000-5000mpa · s, the solid content of 45-55% and the pH value of 4-6. The nozzle adhesive produced by the method can meet the requirements of 12000-charge 17000 cigarettes per minute, the residual quantity of the vinyl acetate monomer is correspondingly reduced, but the viscosity and the solid content of the nozzle adhesive are still higher compared with those of the nozzle adhesive required by a spraying gluing mode, the production requirement of 20000 cigarettes per minute cannot be met, and an emulsifier OP-10 adopted in the synthesis process is an alkylphenol polyoxyethylene ether nonionic emulsifier which has accumulated damage to a human body.

Disclosure of Invention

The invention aims to develop a super-high-speed water-based nozzle adhesive for spraying aiming at the shortage of nozzle adhesives for super-high-speed cigarette making machines in a spraying gluing mode in the domestic market, which has the advantages of higher paper adhesive force, excellent shear rheological property and proper drying speed on the premise of low viscosity and low solid content, can realize stable and uniform glue supply on a spraying gluing cigarette making machine set with the machine speed of 20000 counts/minute, and has no phenomena of flow break and nozzle blockage, and the produced cigarettes have no bad phenomena of air leakage, end turning, bubble wrinkle and the like.

In order to achieve the technical objects of the present invention, in one aspect, the present invention provides a water-based ultra high speed spray nozzle adhesive, which is obtained based on a terpolymer emulsion formed from vinyl acetate, acrylic acid and methyl methacrylate, and further comprises an accelerator for improving fluidity and cohesiveness, polyvinyl alcohol and deionized water, and an initiator, a defoamer, a preservative, and a PH adjuster.

Particularly, the weight ratio of the vinyl acetate, the acrylic acid and the methyl methacrylate is 50-70: 10-20: 5-10.

Particularly, the weight parts of the vinyl acetate, the acrylic acid, the methyl methacrylate, the accelerator, the polyvinyl alcohol and the deionized water are as follows: 50-70: 10-20: 5-10: 3-6: 8-20: 100-245.

Wherein the weight ratio of the vinyl acetate, the acrylic acid, the methyl methacrylate, the polyvinyl alcohol, the initiator, the deionized water, the plasticizer, the defoaming agent, the emulsifier, the preservative and the pH regulator is 50-70: 10-20: 5-10: 8-20: 0.4-1: 100-245: 3-6: 0.5-0.8: 1-2: 0.5-0.8: 1-2.

Wherein the viscosity of the nozzle adhesive is 500-1500mpa · s.

Wherein the solid content of the nozzle connecting glue is 30-40%.

Wherein the pH value of the nozzle adhesive is 4-6.5.

Wherein the initiator is one of potassium persulfate, ammonium persulfate and tert-butyl hydroperoxide.

Wherein the plasticizer is one or more of acetyl tributyl citrate, triacetin, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate and triethyl citrate.

Wherein the defoaming agent is one of polydimethylsiloxane or white mineral oil.

In particular, the emulsifier is polyoxyethylene lauryl ether.

Wherein the pH regulator is one of sodium bicarbonate or sodium acetate.

Wherein the preservative is one of Brobopol and isothiazolinone.

In order to achieve the technical object of the present invention, in another aspect, the present invention provides a method for preparing a water-based ultra high speed spray nozzle adhesive, including:

under the condition of high temperature, forming micelles for polymerization reaction by using deionized water and an emulsifier in a reactor reserved with a small amount of polyvinyl alcohol aqueous solution;

reducing the number of residual monomers by using the micelle, the monomer mixed solution and the initiator solution to obtain a polymerization product;

reducing the temperature to mix the polymerization product with the plasticizer, and vacuumizing in the mixing process to obtain safe polymerization emulsion with reduced harmful substances and removed residual monomers;

and adding the residual polyvinyl alcohol aqueous solution, the nozzle adhesive base material and the deionized water into the safe polymerization emulsion, and fully stirring to obtain the ultrahigh-speed spraying nozzle adhesive with uniform particle size and milky color.

Wherein the amount of the small amount of the polyvinyl alcohol aqueous solution is 5-55% of the weight of all the polyvinyl alcohol aqueous solution.

Preferably, the amount of the small amount of the aqueous polyvinyl alcohol solution is 10 to 40% by weight of the total amount of the aqueous polyvinyl alcohol solution.

Further preferably, the amount of the small amount of the aqueous polyvinyl alcohol solution is 10 to 30% by weight of the total amount of the aqueous polyvinyl alcohol solution.

Wherein the high temperature condition is 70-80 ℃.

Wherein the polyvinyl alcohol aqueous solution is prepared from polyvinyl alcohol and deionized water.

Wherein the weight ratio of the polyvinyl alcohol to the deionized water is 0.8-1.2: 4-8.

Preferably, the weight ratio of the polyvinyl alcohol to the deionized water is 1: 6.

Particularly, the polyvinyl alcohol aqueous solution is prepared from polyvinyl alcohol and deionized water, and comprises the following components:

slowly adding polyvinyl alcohol into the deionized water in a stirring state, raising the temperature, then preserving the heat to completely dissolve the polyvinyl alcohol in the deionized water at the high temperature, and cooling to obtain a polyvinyl alcohol aqueous solution.

Wherein the elevated temperature is 85-95 ℃.

Wherein the heat preservation time is 2 h.

Wherein, the temperature reduction adopts a conventional temperature reduction method.

Preferably, the cooling method adopts cooling water for cooling.

Wherein, the micelle for polymerization reaction is formed by using part of the polyvinyl alcohol aqueous solution, the deionized water and the emulsifier, and the step of stirring the part of the polyvinyl alcohol aqueous solution, the deionized water and the emulsifier.

Wherein the stirring time is 10-20 min.

Preferably, the stirring time period is 15 min.

Wherein the monomer mixed solution is a mixed solution containing vinyl acetate, acrylic acid and methyl methacrylate.

Wherein, the micelle, the monomer mixed solution and the initiator solution are utilized to reduce the number of residual monomers, and the obtained polymerization product comprises:

adding a first amount of monomer mixed solution and an initiator aqueous solution into the micelle to react;

and when the reflux is finished, dropwise adding the monomer mixed solution and the initiator solution with the second dosage, and carrying out stage heat preservation reaction to obtain a polymerization product.

Wherein the stage incubation reaction comprises:

after the monomer mixed solution and the initiator solution with the second dosage are dripped, carrying out first heat preservation;

and after the temperature is raised, carrying out second heat preservation.

Wherein the first heat preservation time is 1-2 h.

Wherein the second heat preservation time is 0.5-1 h.

Wherein the temperature of the temperature rise is 90 ℃.

Wherein the reduction temperature is 60-70 ℃. I.e. the temperature of the evacuation is 60-70 ℃.

Preferably, the reduced temperature is 65 ℃. I.e. the temperature at which the vacuum is drawn is 65 ℃.

Wherein the vacuumizing time is 20-60 min.

Preferably, the period of time for the evacuation is 40 min.

Wherein the addition of the remaining aqueous polyvinyl alcohol solution, the nozzle gum base and the deionized water to the safety polymerized emulsion is carried out at room temperature.

Wherein the sufficient stirring time is 15-50min, preferably 30min

The invention has the beneficial effects that:

1. in the polymerization process, no phthalate plasticizer and alkylphenol polyoxyethylene ether emulsifier which are forbidden to be used by the cigarette industry are used, so that the accumulation damage of the plasticizer and the alkylphenol polyoxyethylene ether emulsifier to a human body is avoided.

2. The invention effectively reduces the content of the residual monomers of the vinyl acetate by adopting a mode of vacuumizing at higher temperature.

3. The invention provides a water-based ultra-high-speed spraying nozzle adhesive with the viscosity of 500-1500mpa · s, the solid content of 30-40% and the pH value of 4-6.5, which has higher paper adhesive force on the premise of low viscosity and low solid content, excellent rheological property suitable for spraying, proper drying speed, stable and uniform glue supply on a spraying gluing cigarette unit with the machine speed of 20000 counts/minute, no cutoff and nozzle blockage, and no adverse phenomena of air leakage, end drop, bubble wrinkle and the like of produced cigarettes.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. These examples are only illustrative and not intended to limit the scope of the present invention. The experimental procedures, for which specific experimental conditions are not indicated in the following examples, are generally carried out according to conventional conditions, or according to conditions recommended by the manufacturers. In the present invention, "%" is used to indicate concentration or content, and is not specifically defined as mass%.

Example 1

1. Proportioning and material preparation

Preparing materials according to the following weight parts: 60 parts of vinyl acetate, 14 parts of acrylic acid, 7 parts of methyl methacrylate, 12 parts of polyvinyl alcohol, 0.6 part of ammonium persulfate, 156 parts of deionized water, 5 parts of triethyl citrate, 0.5-0.8 part of polydimethylsiloxane, 1.5 parts of polyoxyethylene lauryl ether, 0.5-0.8 part of bronopol and 1.4 parts of sodium bicarbonate.

In the embodiment of the present invention, other thermal decomposition type initiators such as potassium persulfate and tert-butyl hydroperoxide, redox system initiators such as ammonium sulfate-sodium bisulfite, etc. may also be used for ammonium persulfate; triethyl citrate can also be replaced by acetyl tributyl citrate, triacetin or 2,2, 4-trimethyl-1, 3-pentanediol diisobutyrate; polydimethylsiloxane can also be replaced by white mineral oil, but is preferably polydimethylsiloxane; the bronopol used in the present invention may also be replaced with isothiazolinones, or with quaternary ammonium salts, such as didecyl dimethyl ammonium chloride; the sodium bicarbonate used in the present invention may also be any product for adjusting the pH of the product, such as acetate or a weak acid strong base salt such as sodium carbonate, sodium citrate, etc.

2. Preparing solution

Weighing the vinyl acetate, the acrylic acid and the methyl methacrylate according to the proportion, and uniformly mixing to prepare a monomer mixed solution for later use; weighing the ammonium persulfate according to the proportion, and adding part of deionized water according to the proportion to prepare an ammonium persulfate aqueous solution with the mass fraction of 5% for later use; and weighing the sodium bicarbonate according to the proportion, and adding part of deionized water according to the proportion to prepare a sodium bicarbonate water solution with the mass fraction of 10% for later use.

The invention mixes the vinyl acetate, the acrylic acid and the methyl methacrylate in advance to form a uniform ternary polymerization product, and is convenient for later-stage dripping use. After the initiator and the pH regulator are prepared into the aqueous solution in advance, the dispersion is more uniform in the subsequent reaction, and particularly, the initiator solution can be used for avoiding local violent reaction in the subsequent operation process.

3. Preparation of aqueous polyvinyl alcohol solutions

Adding 72 parts of deionized water into a reactor, starting stirring, adding 12 parts of polyvinyl alcohol, slowly heating to 90 ℃, keeping the temperature for dissolving for 2 hours until the polyvinyl alcohol is completely dissolved to obtain 84 parts of polyvinyl alcohol aqueous solution, then reducing the temperature to 75 ℃, taking out 68 parts of polyvinyl alcohol aqueous solution for later use, and keeping the rest 16 parts of polyvinyl alcohol aqueous solution in the reactor.

The polyvinyl alcohol is a solid substance and can be agglomerated and undissolved when being directly added into water, so that the polyvinyl alcohol is firstly dissolved, and the technical effect is prevented from being influenced by the phenomenon of agglomeration and insolubility in water; in addition, the polyvinyl alcohol aqueous solution reserved in the reaction can be used as a protective colloid in the later polymerization reaction, so that the polymerization product is more stable.

4. Micelle formation

And adding 60 parts of deionized water and 1.5 parts of polyoxyethylene lauryl ether into the reactor reserved with 16 parts of polyvinyl alcohol aqueous solution, and stirring for 15 min.

Under the action of stirring, the emulsifier and the polyvinyl alcohol aqueous solution are uniformly dispersed in the deionized water to form micelles, so that a stable reaction site is provided for the subsequent polymerization reaction.

5. Polymerisation reaction

And (3) continuously adding 1/3 monomer mixed liquor and 1/3 ammonium persulfate aqueous solution into the reactor, slowly dropwise adding the rest 2/3 monomer mixed liquor and the rest of the initiator solution at the same time when the reaction reflux is finished, controlling the dropwise adding speed to ensure that the dropwise adding of the mixed liquor and the initiator solution is finished within 2.5h +/-5 min, carrying out heat preservation reaction for 2h, heating to 90 ℃, and continuously carrying out heat preservation reaction for 1 h.

According to the invention, through a mode of dripping twice in the later period, the polymerization rate can be well controlled, the reaction is stable, the implosion caused by too fast temperature rise in the polymerization process can be prevented, and meanwhile, the quantity of residual monomers can be effectively reduced through the mode, so that the stability of the emulsion in the later period is improved.

6. Vacuum treatment

And cooling the reactor to 65 ℃ by adopting a conventional cooling mode, adding 5 parts of triethyl citrate, and vacuumizing for 40min under a stirring state.

According to the invention, through vacuum-pumping treatment at a higher temperature of 65 ℃, residual monomers in the polymerized emulsion can be effectively removed, and harmful components identified in the cigarette industry mixed in the plasticizer can be effectively reduced.

7. Obtaining of ultrahigh-speed spraying nozzle glue

And cooling the reactor to room temperature by adopting a conventional cooling mode, then sequentially adding 68 parts of polyvinyl alcohol aqueous solution, 0.6 part of polydimethylsiloxane, 0.6 part of bronopol and 14 parts of sodium bicarbonate aqueous solution for standby, fully stirring for 30min, and adding 20 parts of deionized water to adjust the viscosity, thereby obtaining the milky ultrahigh-speed spraying nozzle adhesive with uniform particle size.

The cooling mode used by the invention can be cooling by introducing cooling water or cooling by using an oil bath. Preferably, the temperature is reduced by cooling water.

Example 2

Except that the following materials are prepared according to the following weight portion: 64 parts of vinyl acetate, 12 parts of acrylic acid, 7 parts of methyl methacrylate, 0.6 part of ammonium persulfate, 1.6 parts of sodium bicarbonate, 14 parts of polyvinyl alcohol, 1.4 parts of isomeric alcohol polyoxyethylene ether, 5 parts of triethyl citrate, 0.6 part of polydimethylsiloxane, 0.6 part of bronopol and 193 parts of water are used; and 18 parts of the aqueous polyvinyl alcohol solution remained in the reactor, the procedure and operation were the same as in example 1.

Example 3

Except that the following materials are prepared according to the following weight portion: using 62 parts of vinyl acetate, 16 parts of acrylic acid, 8 parts of methyl methacrylate, 0.8 part of potassium persulfate, 1.5 parts of sodium bicarbonate, 10 parts of polyvinyl alcohol, 1.5 parts of polyoxyethylene lauryl ether, 4 parts of triethyl citrate, 0.6 part of white mineral oil, 0.6 part of isothiazolinone and 180 parts of total water; and the remaining 20 parts of the aqueous polyvinyl alcohol solution in the reactor, the other steps and the operation were the same as in example 1.

Example 4

Except that the following materials are prepared according to the following weight portion: using 70 parts of vinyl acetate, 12 parts of acrylic acid, 9 parts of methyl methacrylate, 0.8 part of tert-butyl hydroperoxide, 1.6 parts of sodium acetate, 18 parts of polyvinyl alcohol, 1.6 parts of polyoxyethylene lauryl ether, 5 parts of glycerol triacetate, 0.6 part of polydimethylsiloxane, 0.6 part of bronopol and 205 parts of total added water; and 23 parts of an aqueous polyvinyl alcohol solution remained in the reactor, the other steps and the operation were the same as in example 1.

Example 5

Except that the following materials are prepared according to the following weight portion: 50 parts of vinyl acetate, 10 parts of acrylic acid, 5 parts of methyl methacrylate, 0.4 part of ammonium persulfate, 1 part of sodium bicarbonate, 19 parts of polyvinyl alcohol, 1 part of polyoxyethylene lauryl ether, 3 parts of triethyl citrate, 0.6 part of polydimethylsiloxane, 0.6 part of isothiazolinone and 210 parts of total added water; and 12 parts of an aqueous polyvinyl alcohol solution remained in the reactor, the other steps and the operation were the same as in example 1.

Example 6

Except that the following materials are prepared according to the following weight portion: using 70 parts of vinyl acetate, 20 parts of acrylic acid, 10 parts of methyl methacrylate, 1 part of ammonium persulfate, 2 parts of sodium bicarbonate, 8 parts of polyvinyl alcohol, 2 parts of polyoxyethylene lauryl ether, 6 parts of tributyl acetylcitrate, 0.6 part of polydimethylsiloxane, 0.6 part of bronopol and 184 parts of total water addition; and 30 parts of an aqueous polyvinyl alcohol solution remained in the reactor, the other steps and the operation were the same as in example 1.

Example 7

Except that the following materials are prepared according to the following weight portion: 60 parts of vinyl acetate, 15 parts of acrylic acid, 8 parts of methyl methacrylate, 0.7 part of potassium persulfate, 1.5 parts of sodium bicarbonate, 10 parts of polyvinyl alcohol, 1.6 parts of polyoxyethylene lauryl ether, 4 parts of glyceryl triacetate, 0.6 part of polydimethylsiloxane, 0.6 part of bronopol and 187 parts of total added water; and 17 parts of an aqueous polyvinyl alcohol solution remained in the reactor, the other steps and the operation were the same as in example 1.

Test examples

The ultra high speed spray nozzle adhesive prepared in examples 1 to 8 was tested according to YC/T188-2004 "high speed cigarette adhesive" standard, and the results are shown in Table 1.

TABLE 1 results of conventional physical index measurements

Examples	Viscosity mpa s, 25℃	Solid content%	pH value
				Example 1	1200	35.8	4.7
Example 2	960	35.7	4.9
				Example 3	980	36.8	4.8
Example 4	1120	36.6	4.9
				Example 5	1050	30.1	4.8
Example 6	1080	39.5	4.9
				Example 8	1450	35.4	4.8

The detection result obtained by the detection of the computer test shows that the glue has the characteristics of large cohesive force, excellent rheological property, proper drying speed and the like, can realize stable and uniform gluing on a cigarette unit with 20000 cigarettes/min machine speed and produces cigarettes without adverse phenomena of air leakage, turning around, crumpling and the like.

The invention effectively reduces the content of harmful ingredients in the ultrahigh-speed spraying nozzle adhesive by selecting environment-friendly raw materials and reasonably designing the formula proportion and the preparation process.

According to the invention, by synthesizing the terpolymer emulsion with excellent performance, the nozzle adhesive produced under the condition of adding auxiliaries such as polyvinyl alcohol and plasticizer can have proper drying speed, strong binding power and excellent rheological property suitable for spraying on the premise of lower viscosity and solid content, and can well meet the production requirement of a spraying and gluing cigarette unit with speed up to 20000 counts/min.

The above description is only a preferred example for facilitating understanding of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. All changes, equivalents, and modifications that come within the spirit and scope of the invention are desired to be protected.

Claims (5)

1. The water-based ultrahigh-speed spraying nozzle adhesive is characterized by being obtained based on a ternary polymerization emulsion formed by methyl methacrylate, vinyl acetate and acrylic acid, and further comprising a plasticizer, polyvinyl alcohol and deionized water for improving fluidity and cohesiveness, an initiator, a defoaming agent, a preservative and a pH regulator;

wherein the weight ratio of the vinyl acetate, the acrylic acid, the methyl methacrylate, the polyvinyl alcohol, the initiator, the deionized water, the plasticizer, the defoaming agent, the emulsifier, the preservative and the pH regulator is 50-70: 10-20: 5-10: 8-20: 0.4-1: 100-245: 3-6: 0.5-0.8: 1-2: 0.5-0.8: 1-2;

wherein the viscosity of the nozzle adhesive is 500-1500mpa · s, the solid content is 30-40%, and the PH value is 4-6.5.

2. A method for preparing the water-based ultra high speed spray nozzle paste of claim 1, comprising:

under the condition of high temperature, forming micelles for polymerization reaction by using deionized water and an emulsifier in a reactor reserved with a small amount of polyvinyl alcohol aqueous solution;

reducing the number of residual monomers by using the micelle, the monomer mixed solution and the initiator solution to obtain a polymerization product;

reducing the temperature to mix the polymerization product with the plasticizer, and vacuumizing in the mixing process to obtain safe polymerization emulsion with reduced harmful substances and removed residual monomers;

adding the residual polyvinyl alcohol aqueous solution, the nozzle adhesive base material and deionized water into the safe polymerization emulsion, and fully stirring to obtain the ultrahigh-speed spraying nozzle adhesive with uniform particle size and milky color;

wherein the monomer mixed solution is a mixed solution containing vinyl acetate, acrylic acid and methyl methacrylate.

3. The method of claim 2, wherein the elevated temperature conditions are 70-80 ℃.

4. The method of claim 2, wherein reducing the amount of residual monomer using the micelle, the monomer mixture, and the initiator solution to provide a polymerized product comprises:

adding a first amount of monomer mixed solution and an initiator aqueous solution into the micelle to react;

and when the reflux is finished, dropwise adding the monomer mixed solution and the initiator solution with the second dosage, and carrying out stage heat preservation reaction to obtain a polymerization product.

5. The method of claim 2, wherein the evacuation time is 20-60 min.