High-speed nozzle glue modified by konjac powder and preparation method thereof

Abstract

The high-speed nozzle glue modified by konjac powder provided by the present invention is made of VAE emulsion, multifunctional acrylate, initiator, reducing agent, konjac powder, polyvinyl alcohol, additives and pure water raw materials, wherein the mass ratio of VAE emulsion, acrylate, initiator, reducing agent, konjac powder, polyvinyl alcohol and additives is (70-80): (0.2-0.5): 0.05: 0.025: (0.5-1): (10-20): (0.23-0.28); acrylic emulsion and konjac powder are reacted in advance to prepare modified konjac powder; the additives mainly include: defoamer, bactericide, pH value regulator. The high-speed nozzle glue provided by the present invention has excellent dynamic rheological properties, strong adhesion, less glue scale, no problems such as glue throwing and flying glue, and can basically meet the needs of all current high-speed roller coating equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of cigarette adhesives, and particularly relates to a high-speed mouthpiece adhesive modified by konjac powder and a preparation method thereof. Background Art

[0002] Tipping paper is a tobacco material used to wrap the filter tips of cigarettes, and tipping glue is an adhesive used to connect cigarettes and filters during cigarette production.

[0003] After the release of the permitted use list of water-based adhesive raw materials for tobacco industry, many water-based adhesive cross-linking agents with excellent performance, such as boric acid, borax and other materials, have been banned, which has greatly restricted the performance of water-based adhesive for cigarettes, especially roller-coated high-speed cigarette mouthpiece adhesive. When the cigarette rolling machine speed is higher than 7000 cigarettes / minute, especially when the machine speed reaches 12000 cigarettes / minute, problems such as weak adhesion, air leakage, glue flying, and excessive glue scale are prone to occur. The product of the present invention can solve this series of problems well, is suitable for use in 12000 cigarettes / minute high-speed cigarette mouthpiece machines, and can meet market demand.

[0004] Konjac flour, also known as konjac flour or konjac mannan, is an extract of konjac. The main component is konjac glucomannan (KGM). KGM is a complex polysaccharide composed of many D-glucose and D-mannose in a molar ratio of 1:1.6 or 2:3 through β-1,4 glycosidic bonds. There is a branched structure bonded by β-1,3 bonds at the C-3 position of the main chain mannose. There are about 3 branches on every 32 sugar residues. There is an acetyl group every 9-19 sugar units along the main chain of glucomannan, which helps the dissolution of glucomannan. The unique structure of konjac glucomannan gives it unique properties, making it have excellent adhesion, film-forming, solubility, gelling, thickening, water retention and other characteristics, making it widely used in the food industry, and can also be widely used in medicine, printing and dyeing, architectural coatings, textiles and papermaking. By utilizing its structural characteristics, further modification, blending and compounding can broaden its application areas.

[0005] Konjac flour is a food additive that is internationally recognized as safe. It is widely used in the food, chemical, pharmaceutical and other industries, but there are few application studies in the field of water-based adhesives for cigarettes. Due to its large molecular weight, strong hydration ability and non-charged properties, KGM has excellent adhesion. At the same time, KGM contains a large number of hydroxyl groups. Due to the interaction of hydrogen bonds in its aqueous solution, it is easy to form a three-dimensional network physical cross-linking structure. In particular, the acetyl groups contained in konjac flour can be hydrolyzed and deacetylated under mild alkaline conditions. The hydroxyl groups in the deacetylated glucomannan further bond to form new active centers, which is more conducive to the hydrogen bond cross-linking of the hydroxyl groups between molecules, greatly improving the hydrogen bonding effect inside the KGM molecule, inducing the interaction between the long chain of glucomannan and PVA, and forming a new network space structure. This unique cross-linking system can well solve the problems of poor adhesion and flying glue of cigarette adhesives. On the other hand, the large amount of hydroxyl contained in KGM has good water absorption and moisture retention, which can effectively reduce the volatilization of water, and at the same time can enhance the wettability of the butt paper and have a suitable open time, so that it has good adaptability to the machine and prevents problems such as excessive glue scale, turning and leaking. In particular, food-grade konjac flour is safe and environmentally friendly, has no VOC, and fully meets the safety and sanitation requirements of water-based glue for cigarettes. It is necessary to use the characteristics of konjac flour to invent a high-speed nozzle glue, provide a variety of nozzle glue options, and meet the specific needs of users and production applications. Summary of the invention

[0006] In view of the deficiencies in the prior art, the invention provides a high-speed mouthpiece adhesive modified by konjak flour and a preparation method thereof. The invention utilizes the characteristics of konjak flour, performs graft modification on the konjak flour by adding multifunctional acrylate, and then blends the modified konjak flour with polyvinyl alcohol. Since a large amount of hydroxyl groups in KGM form a strong association cross-linking effect with the hydroxyl groups between PVA molecules, under the action of alkali, the hydroxyl groups in the deacetylated glucomannan are easy to further bond to form a new active center, which is more conducive to the physical cross-linking produced by the hydrogen bond interaction of the hydroxyl groups between molecules, thereby greatly improving the dynamic rheological properties of the cigarette adhesive, and having strong bonding force, less adhesive scale, and no problems such as glue throwing and flying glue, and basically meeting the requirements of all current high-speed roller coating equipment.

[0007] In order to achieve the technical purpose of the invention, the technical solution of the present invention is implemented as follows:

[0008] The high-speed nozzle glue modified by konjac flour provided by the invention is prepared from VAE emulsion, multifunctional acrylate, initiator, reducing agent, konjac flour, polyvinyl alcohol, additives and pure water raw materials, wherein the mass ratio of VAE emulsion, acrylate, initiator, reducing agent, konjac flour, polyvinyl alcohol and additive is (70-80): (0.2-0.5): 0.05: 0.025: (0.5-1): (10-20): (0.23-0.28); acrylic emulsion and konjac flour are reacted in advance to prepare modified konjac flour; the additives mainly include: defoamer, bactericide and pH value regulator.

[0009] Preferably, the high-speed mouthpiece glue modified by konjac flour provided by the present invention has a purity of more than 96% and a glucomannan content of more than 85%, a viscosity of 27000-30000 mPa.s, and a particle size of 50-100 meshes.

[0010] Preferably, in the high-speed nozzle glue modified by konjac flour provided by the present invention, the multifunctional acrylate is an acidic acrylate; more preferably, it is one or more selected from pentaerythritol triacrylate, ethylene glycol dimethacrylate and 1,4-butanediol dimethacrylate.

[0011] Preferably, in the high-speed nozzle glue modified by konjac flour provided by the present invention, the glass transition temperature of the VAE emulsion is -5 to 10° C., the solid content is 55 to 60%, the pH value is 4.0 to 6.0, and the viscosity is 1500 to 2500 mPa.s.

[0012] Preferably, in the high-speed mouthpiece glue modified by konjac flour provided by the present invention, the polyvinyl alcohol has a purity of more than 93.5%, a degree of alcoholysis of 87-89%, and a degree of polymerization of 1700-2200.

[0013] Moreover, preferably, in the high-speed nozzle glue modified by konjac flour provided by the present invention, the initiator is ammonium persulfate, the reducing agent is sodium bisulfite; the defoaming agent is a mineral oil defoaming agent; the pH value regulator is sodium bicarbonate; the bactericide is isothiazolin; and the pure water is deionized pure water treated by reverse osmosis membrane filtration.

[0014] The present invention also provides a method for preparing the high-speed nozzle glue modified by konjac powder, comprising the following steps:

[0015] (1) Preparation of modified konjac flour: 92-96 parts of water were weighed by mass percentage, stirred, and 0.5-1 parts of special konjac flour were slowly added, and stirred for 2 hours to make it completely dispersed; 0.2-0.5 parts of multifunctional acidic acrylate were added, the temperature was raised to 60° C., the stirring speed was adjusted to 100 r / min, and a 20% aqueous solution prepared by 0.05 parts of ammonium persulfate and a 10% aqueous solution prepared by 0.025 parts of sodium bisulfite were simultaneously added dropwise to a reactor through a peristaltic pump, and the dripping was controlled to be completed within 4 hours. After the dripping was completed, the temperature was raised to 70° C. and kept warm for 2 hours, and then cooled to room temperature;

[0016] (2) by mass counting, weigh 10-20 parts of PVA, add it to 60-70 parts of water, heat and stir in a 90 ℃ water bath for 2 hours to dissolve it; add 10-20 parts of modified konjak flour prepared in step (1), 1-5 parts of propylene glycol and 0.03-0.05 parts of alkali, stir for 120 minutes, drop to room temperature and place for 48 hours, make modified konjak flour and polyvinyl alcohol, propylene glycol mixed solution, standby;

[0017] (3) Take 70-80 parts of VAE emulsion and add it to a stirring kettle, start stirring, add 0.1 parts of defoamer and 0.1 parts of fungicide, stir for 10 minutes, mix well, and set aside;

[0018] (4) adding 10 to 20 parts of the modified konjac flour prepared in step (2) and a mixed solution of polyvinyl alcohol and propylene glycol to the VAE emulsion prepared in step (3), stirring for 40 min, adding a pH regulator and pure water, and stirring for 20 min;

[0019] (5) The viscosity of the material obtained in step (4) is adjusted to 3000-4000 mPa.s, and the material is discharged to obtain a high-speed nozzle glue.

[0020] The inventors found that by adding multifunctional acrylate to graft-modify konjac flour, and then blending the modified konjac flour with polyvinyl alcohol, a large number of hydroxyl groups in KGM form a strong association cross-linking effect with the hydroxyl groups between PVA molecules. Under the action of alkali, the hydroxyl groups in the deacetylated glucomannan are easy to further bond to form new active centers, which is more conducive to the hydrogen bond interaction between the hydroxyl groups in the molecules to produce physical cross-linking, thereby greatly improving the dynamic rheological properties of the cigarette adhesive, and having strong adhesion, less adhesive scale, and no flying glue, so that high-speed mouthpiece adhesive with excellent performance can be prepared.

[0021] The present invention has produced good effects:

[0022] (1) The high-speed nozzle glue of the present invention has a small contact angle with the tipping paper, and the glue has good wettability to the tipping paper, thereby avoiding problems such as wrinkles and poor bonding, and exhibits good penetration and coating properties on the surface of the tipping paper. At the same time, it has good bonding properties and high-speed rheological stability, and is adapted to the operating requirements of a high-speed roller coating cigarette machine.

[0023] The average bonding force (25°C 65% RH) of the high-speed nozzle glue of the present invention reaches 1.75-1.86N, which is significantly higher than the existing commercially available products;

[0024] The high-speed nozzle glue of the present invention has good rheological properties. From the rheological curve, the viscosity remains stable when the shear rate reaches 900 inverse seconds or more, and the shear resistance is significantly better than that of existing commercial products. Under the same glue pressing conditions, the glue amount during high-speed operation is greater than that of existing commercial products, which is more in line with the high-speed shear resistance characteristics and can better meet the operating requirements of high-speed roller coating cigarette machines.

[0025] (2) The high-speed nozzle glue of the present invention can meet the production and operation requirements of roller-coated cigarette machines such as ZJ119, Protos90E, and Protos70 (maximum machine speed of 12,000 cigarettes / min), overcomes the defects of ordinary cigarette nozzle glue, and has stable machine adaptability at a running speed of 12,000 cigarettes / min. It exhibits the characteristics of less adhesive scale and low air leakage rejection rate, strong wet adhesion, good matching of drying speed, and appropriate rheological shear resistance. When the machine speed reaches 12,000 cigarettes / min, it can stably continue production for more than 8 hours. Compared with the existing commercially available nozzle glue, the present invention has stronger bonding and better cigarette shaping. The equipment operating speed is increased to 12,000 cigarettes / min, and the cigarette defect rate is maintained at a level below 0.005% after 10 hours of operation, which significantly improves the production efficiency and the quality of finished cigarettes. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the embodiments, but the scope of the present invention is not limited to these embodiments.

[0027] Example 1

[0028] A preparation method of a novel roller-coated high-speed nozzle glue modified by konjac powder is as follows:

[0029] 1.1 Preparation of modified konjac flour:

[0030] According to mass percentage, weigh 95 parts of water, start stirring, slowly add 0.6 part of special grade konjac powder (purity 96.2%, glucomannan content 85.5%, viscosity is 28000mPa.s, particle size is 80 mesh), stir for 2 hours to make it disperse completely. Add 0.3 part of ethylene glycol dimethacrylate, warm up to 60 ℃, adjust stirring speed at 100r / min, drip 20% aqueous solution prepared by 0.05 part of ammonium persulfate and 10% aqueous solution prepared by 0.025 part of sodium bisulfite to stirring tank by peristaltic pump at the same time, control to drip off in 4 hours, drip off, warm up to 70 ℃ and keep warm for 2 hours, cool to room temperature;

[0031] 1.2 by mass percentage, take by weighing 15 parts of PVA (parameter is purity 93.8%, alcoholysis degree is 88%, and degree of polymerization is 1900), join in 70 parts of water, heated and stirred in 90 ℃ water-bath for 2 hours, dissolve it.Then add 12 parts of modified konjak powder, 2 parts of propylene glycols and 0.03 part of sodium bicarbonate prepared by step 1.1, stir 120 minutes, drop to room temperature and place 48 hours, make modified konjak powder and polyvinyl alcohol, propylene glycol mixed solution for standby use.

[0032] 1.3 According to mass percentage, weigh 82 parts of VAE emulsion (parameters: glass transition temperature of -1°C, solid content of 58%, pH value: 5.1, viscosity: 2100mPa.s) and add it to the stirring kettle, start stirring, add 0.1 parts of defoamer and 0.1 parts of bactericide, and stir for 10 minutes;

[0033] 1.4 Add 12 parts of the modified konjac flour, polyvinyl alcohol and propylene glycol mixture prepared in step 1.2 to the VAE emulsion prepared in step 1.3 according to mass percentage, and stir for 40 minutes.

[0034] 1.5 Adjust the pH value to 5.4-5.6 with sodium bicarbonate, add 6 parts of water, stir for 15 minutes and discharge the material with a viscosity of 3480mpa.s.

[0035] Example 2

[0036] Another method for preparing a roller-coated high-speed nozzle glue modified by konjac flour is as follows:

[0037] 1.1 Preparation of modified konjac flour:

[0038] According to mass percentage, weigh 96 parts of water, start stirring, slowly add 0.8 part of special grade konjac flour (purity 96.2%, glucomannan content 85.5%, viscosity is 28000mPa.s, particle size is 80 mesh), stir for 2 hours to make it disperse completely. Add 0.4 part of pentaerythritol triacrylate, warm up to 60 ℃, adjust stirring speed at 100r / min, drip 20% aqueous solution prepared by 0.05 part of ammonium persulfate and 10% aqueous solution prepared by 0.025 part of sodium bisulfite to stirring tank by peristaltic pump at the same time, control to drip off in 4 hours, drip off, warm up to 70 ℃ and keep warm for 2 hours, cool to room temperature;

[0039] 1.2 by mass percentage, take by weighing 15 parts of PVA (parameter is purity 93.8%, alcoholysis degree is 88%, and degree of polymerization is 1900), join in 64 parts of water, in 90 ℃ water-bath, heated and stirred 2 hours, it is dissolved.Then add 18 parts of modified konjak powder, 3 parts of propylene glycols and 0.05 part of sodium bicarbonate prepared by step 1.1, stir 120 minutes, drop to room temperature and place 48 hours, make modified konjak powder and polyvinyl alcohol, propylene glycol mixed solution for standby use.

[0040] 1.3 According to the mass percentage, weigh 75 parts of VAE emulsion (parameters are: glass transition temperature of -1°C, solid content of 58%, pH value: 5.1, viscosity: 2100mPa.s) and add it to the stirring kettle, start stirring, add 0.1 parts of defoamer and 0.1 parts of bactericide, and stir for 10 minutes;

[0041] 1.4 Add 18 parts of the modified konjac flour, polyvinyl alcohol and propylene glycol mixture prepared in step 1.2 to the VAE emulsion prepared in step 1.3 according to mass percentage, and stir for 40 minutes.

[0042] 1.5 Adjust the pH value to 5.4-5.6 with sodium bicarbonate, add 7 parts of water, stir for 15 minutes and discharge the material with a viscosity of 3480mpa.s.

[0043] Comparative Example 1

[0044] We purchased cigarette tipping glue products (name: high-speed tipping glue) from the market and applied them to cigarette tipping paper. We also conducted performance testing and machine suitability performance evaluation.

[0045] Comparative Example 2

[0046] Compared with Example 1, the difference is that the konjac flour modification is not adopted, and all the other formulas and processes are all the same, and the obtained high-speed nozzle glue is:

[0047] 1.1 Preparation of acrylic emulsion:

[0048] Weigh 95 parts of water by mass percentage, start stirring, slowly add 0.3 parts of ethylene glycol dimethacrylate, raise the temperature to 70°C, adjust the stirring rate to 100r / min, keep warm for 2 hours, and cool to room temperature;

[0049] 1.2 According to mass percentage, weigh 15 parts of PVA (parameters are purity 93.8%, alcoholysis degree 88%, polymerization degree 1900), add it to 70 parts of water, heat and stir in a 90°C water bath for 2 hours to dissolve it. Then add 12 parts of acrylic emulsion prepared in step 1.1, 2 parts of propylene glycol and 0.03 parts of sodium bicarbonate, stir for 120 minutes, cool to room temperature and place for 48 hours to obtain a mixed solution of acrylic acid, polyvinyl alcohol and propylene glycol for use.

[0050] 1.3 According to mass percentage, weigh 82 parts of VAE emulsion (parameters: glass transition temperature of -1°C, solid content of 58%, pH value: 5.1, viscosity: 2100mPa.s) and add it to the stirring kettle, start stirring, add 0.1 parts of defoamer and 0.1 parts of bactericide, and stir for 10 minutes;

[0051] 1.4 Add 12 parts of the mixed solution of acrylic acid, polyvinyl alcohol and propylene glycol prepared in step 1.2 to the VAE emulsion prepared in step 1.3 according to mass percentage, and stir for 40 minutes.

[0052] 1.5 Adjust the pH value to 5.4-5.6 with sodium bicarbonate, add 6 parts of water, stir for 15 minutes and discharge the material with a viscosity of 3550mpa.s.

[0053] The following experimental test data further illustrate the beneficial effects of the present invention:

[0054] The index detection data of each embodiment and comparative example are shown in the following Table 1:

[0055] Table 1 Index test data of each embodiment and comparative example

[0056]

[0057] Comparison of computer adaptability indicators:

[0058] Machine adaptability refers to providing cigarette manufacturers with an evaluation system and method for pre-determining the effect of cigarette adhesives on machines through tests of open time, adhesion, contact angle, and rheology. Among them, open time refers to the time required for water-based adhesives to form a film under specified drying conditions; adhesion refers to the intermolecular bonding force at the interface between the adhesive and the bonded object, which characterizes the bonding strength and peel strength of the adhesive; the contact angle mainly characterizes the wettability of the adhesive on the paper, thereby determining the matching adaptability of the adhesive and cigarette paper.

[0059] The machine adaptability indicators of each embodiment and comparative example are shown in Table 2 below:

[0060] Table 2 Machine adaptability test data of each embodiment and comparative example

[0061]

[0062] From the data in the machine adaptability index table, it can be seen that Examples 1 and 2 have strong adhesive force, suitable open time, and small contact angle on the tipping paper, indicating that the glue has good wettability on the tipping paper, avoiding problems such as blistering, wrinkling, and poor bonding. Comparative Example 2 has a short open time, a large contact angle, and poor wettability. It is easy to have problems such as excessive glue scale and blistering when it is put on the machine, resulting in a high cigarette defect rate.

[0063] The rheological test was performed on each embodiment and comparative example using a HAAKE MARS 60 rheometer, wherein the viscosity changes at different shear rates are shown in Table 3 below:

[0064] Table 3 Rheological data of various embodiments and comparative examples

[0065]

[0066] As can be seen from the above table 3, embodiment 1 and embodiment 2 are along with the increase of shear rate, and the viscosity decline is less, and relative to comparative example 2, shows that the dynamic rheological property of the high-speed nozzle glue adopting konjac powder modification is greatly improved under high-speed roller coating.Comparative example 2 has a large shear thinning degree when reaching 900 / s high-speed operation, causes the amount of adhesive tape to be few, and the open time is fast on the tipping paper, thus brings many adhesive scales, and the problems such as poor bonding.

[0067] The test results of each nozzle glue product on the ZJ119 machine (machine speed 12000 pieces / min) are shown in Table 4 below:

[0068] Table 4: Operation of each embodiment and comparative example

[0069]

[0070] visible:

[0071] (1) The high-speed nozzle glue of the present invention has a small contact angle with the tipping paper, and the glue has good wettability to the tipping paper, thereby avoiding problems such as wrinkles and poor bonding, and exhibits good penetration and coating properties on the surface of the tipping paper. At the same time, it has good bonding properties and high-speed rheological stability, and is adapted to the operating requirements of a high-speed roller coating cigarette machine.

[0072] The average bonding force (25°C 65% RH) of the high-speed nozzle glue of the present invention reaches 1.75-1.86N, which is significantly higher than the existing commercially available products;

[0073] The high-speed nozzle glue of the present invention has good rheological properties. From the rheological curve, the viscosity remains stable when the shear rate reaches 900 inverse seconds or more, and the shear resistance is significantly better than that of existing commercial products. Under the same glue pressing conditions, the glue amount during high-speed operation is greater than that of existing commercial products, which is more in line with the high-speed shear resistance characteristics and can better meet the operating requirements of high-speed roller coating cigarette machines.

[0074] (2) The high-speed nozzle glue of the present invention can meet the production and operation requirements of the ZJ119 type (machine speed 12,000 cigarettes / min) roller-coated cigarette making machine, overcomes the use defects of ordinary cigarette nozzle glue, and still has stable machine adaptability at an operating speed of 12,000 cigarettes / min. It exhibits the characteristics of less adhesive scale and low air leakage rejection rate, strong wet adhesion, good matching of drying speed and suitable anti-rheological shear performance. When the operating speed reaches 12,000 cigarettes / min, it can stably continue production for more than 10 hours. Compared with the existing commercially available nozzle glue, the present invention has stronger bonding and better cigarette shaping. The equipment operating speed is increased to 12,000 cigarettes / min. After running for up to 10 hours, the cigarette defect rate is still maintained at a level below 0.005%, which significantly improves the production efficiency and the quality of the finished cigarettes.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed mouthpiece glue modified by konjac powder, which is made of VAE emulsion, multifunctional acrylate, initiator, reducing agent, konjac powder, polyvinyl alcohol, additives and pure water raw materials, characterized in that, The mass ratio of the VAE emulsion, multifunctional acrylate, initiator, reducing agent, konjac flour, polyvinyl alcohol and additives is (70-80): (0.2-0.5): 0.05: 0.025: (0.5-1): (10-20): (0.23-0.28); the multifunctional acrylate is selected from one or more of pentaerythritol triacrylate, ethylene glycol dimethacrylate and 1,4-butanediol dimethacrylate, and the multifunctional acrylate is pre-crosslinked with the konjac flour to prepare the modified konjac flour; the additives include: a defoamer, a bactericide and a pH regulator.

2. The high-speed mouthpiece glue modified by konjac flour according to claim 1, characterized in that, The konjac powder has a purity greater than 96%, a glucomannan content greater than 85%, a viscosity of 27000-30000 mPa.s, and a particle size of 50-100 meshes.

3. according to claim 1 or 2 a kind of konjac powder modified high-speed mouthpiece glue, it is characterized in that, The VAE emulsion has a glass transition temperature of -5 to 10°C, a solid content of 55 to 60%, a pH value of 4.0 to 6.0, and a viscosity of 1500 to 2500 mPa.s.

4. according to claim 1 or 2 a kind of konjac powder modified high-speed mouthpiece glue, it is characterized in that, The polyvinyl alcohol has a purity of more than 93.5%, an alcoholysis degree of 87-89%, and a polymerization degree of 1700-2200.

5. according to claim 1 or 2 a kind of konjac powder modified high-speed mouthpiece glue, it is characterized in that, The initiator added is ammonium persulfate and the reducing agent is sodium bisulfite.

6. according to claim 1 or 2 a kind of konjac powder modified high-speed mouthpiece glue, it is characterized in that, The defoaming agent is a mineral oil defoaming agent; the pH value adjusting agent is sodium bicarbonate; the bactericide is isothiazolin; and the pure water is deionized pure water treated by reverse osmosis membrane filtration.

7. The method for preparing the high-speed mouthpiece glue modified by konjac flour according to any one of claims 1 to 6, wherein: The following steps are involved: (1) Preparation of modified konjac flour: 92-96 parts of water were weighed by mass percentage, stirred, and 0.5-1 parts of special konjac flour were slowly added, and stirred for 2 hours to make it completely dispersed; 0.2-0.5 parts of multifunctional acidic acrylate were added, the temperature was raised to 60° C., the stirring speed was adjusted to 100 r / min, and a 20% aqueous solution prepared by 0.05 parts of ammonium persulfate and a 10% aqueous solution prepared by 0.025 parts of sodium bisulfite were simultaneously added dropwise to a reactor through a peristaltic pump, and the dripping was controlled to be completed within 4 hours. After the dripping was completed, the temperature was raised to 70° C. and kept warm for 2 hours, and then cooled to room temperature; (2) by mass counting, weigh 10-20 parts of PVA, add it to 60-70 parts of water, heat and stir in a 90 ℃ water bath for 2 hours to dissolve it; add 10-20 parts of modified konjak flour prepared in step (1), 1-5 parts of propylene glycol and 0.03-0.05 parts of alkali, stir for 120 minutes, drop to room temperature and place for 48 hours, make modified konjak flour and polyvinyl alcohol, propylene glycol mixed solution, standby; (3) Take 70-80 parts of VAE emulsion and add it to a stirring kettle, start stirring, add 0.1 parts of defoamer and 0.1 parts of fungicide, stir for 10 minutes, mix well, and set aside; (4) adding 10 to 20 parts of the modified konjac flour prepared in step (2) and a mixed solution of polyvinyl alcohol and propylene glycol to the emulsion prepared in step (3), stirring for 40 minutes, adding a pH regulator and pure water, and stirring for 20 minutes; (5) The viscosity of the material obtained in step (4) is adjusted to 3000-4000 mPa.s, and the material is discharged to obtain a high-speed nozzle glue.

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