Nozzle glue for spraying equipment and preparation method thereof

Abstract

The invention discloses a nozzle glue for spraying equipment and a preparation method, and the technical field of nozzle glue adhesives. The invention comprises 60-85 parts of modified VAE emulsion, 0-3 parts of defoamer, 0-3 parts of bactericide, 0-1 parts of preservative, 5-30 parts of modified polyvinyl alcohol, 10-30 parts of diluent, and 0-3 parts of pH regulator. The invention uses modified VAE emulsion as the basic raw material of adhesive, and VAE emulsion itself has low surface tension, good rheological properties, good wet viscosity, strong initial adhesion, ultra-low VOC content, and excellent environmental performance.

Description

Technical Field

[0001] The invention relates to the technical field of nozzle adhesives, and in particular to a nozzle adhesive for spraying equipment and a preparation method thereof. Background Art

[0002] The quality of cigarette tip is an important indicator of cigarette product quality. Its stability directly affects the quality of cigarette products (such as the draw resistance of cigarettes, the appearance quality of cigarettes, etc.), and is a key factor in whether it can eventually become a qualified cigarette product. Therefore, the quality of the tip glue affects the quality of cigarette tip. Improving the adaptability of the tip glue to the machine is of great significance to the production efficiency and product quality of the packaging workshop.

[0003] The new high-speed cigarette maker PR0T0S M5 (hereinafter referred to as M5) promoted by Germany's Hauni Company has entered the Chinese cigarette machine market in large quantities. Compared with the company's main model PROTOS 70 (hereinafter referred to as 70) launched in the early 1990s, it has innovative designs both in terms of technology and concept, and the tipping paper gluing device is one of them. The tipping paper gluing device plays a decisive role in the quality of the cigarette nozzle. It aligns the tipping paper along the center of the machine, applies an even amount of glue on the running tipping paper surface, and detects the running condition of the tipping paper.

[0004] PR0T0S M5 is different from PROTOS 70, 90E and other roller coating methods. PR0T0S-M5 adopts spraying gluing method, which is composed of glue spraying mechanism, glue supply mechanism, cleaning mechanism, cooling mechanism and electronic control part. It mainly includes rotor, nozzle, nozzle head, glue tank, pneumatic glue pump, filter, proportional input valve, glue pressure regulator, water tank, water pump, water tank, pipeline, servo motor and electronic control part. When working, the pneumatic glue pump pumps glue from the sealed glue bag and transports it to the nozzle head through three pipes respectively, corresponding to the three glue areas isolated from the rotor, so as to achieve regional gluing. The motor drives the rotor in the nozzle head to rotate, and the baffle on the rotor controls the opening and closing of the glue spraying channel. The glue is sprayed from the eight glue channels to realize the glue pattern that meets the process requirements on the tipping paper, and the cooling mechanism cools the rotor. When shutting down, the rotor closes the glue spraying channel, the nozzle head is driven by the motor, and the nozzle is transferred to the water tank below for cleaning and sealing and soaking. When production starts again, the nozzle head is turned out, and the air grids on both sides are connected to compressed air for drying. Spraying equipment has high requirements on the rheology, permeability and initial viscosity of the glue. The problems that may be encountered in spraying nozzle glue include: 1. Smooth spraying, nozzle blockage, uneven glue application; 2. Adhesion problems, misaligned teeth, wrinkles, air leakage and other problems; 3. Pre-perforated tipping paper may penetrate the glue and dirty the equipment quickly; 4. The glue accumulates and drips at the nozzle mouth, and the glue is not completely taken away by the paper. All these limit its wide application. These drawbacks have led to low production efficiency and increased defective rate, which is difficult to meet the needs of the current market. Publication No. CN 116355558 A proposes a water-based ultra-high-speed spray nozzle glue. The components in this technical solution include vinyl acetate, methyl methacrylate, and acrylic acid ternary copolymer emulsion, but its total VOC is relatively high and does not meet the standards. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a nozzle glue for spraying equipment and a preparation method thereof, which has high initial adhesion, strong penetration, good rheological properties, good durability and low VOC characteristics, meets the current application standards of water-based glue for cigarettes, and is not sticky when used in spraying equipment, has good rheological properties, does not clog the equipment, has uniform glue application, and has excellent bonding properties.

[0006] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0007] A nozzle glue for spraying equipment comprises the following components, measured in parts by weight: 60-85 parts of modified VAE emulsion, 0-3 parts of defoaming agent, 0-3 parts of bactericide, 0-1 parts of preservative, 5-30 parts of modified polyvinyl alcohol, 10-30 parts of diluent and 0-3 parts of pH regulator.

[0008] Furthermore, a nozzle glue for spraying equipment includes the following components in parts by weight: 60-85 parts of modified VAE emulsion, 0-1 part of defoaming agent, 0-1 part of bactericide, 0-1 part of preservative, 10-20 parts of modified polyvinyl alcohol, 10-25 parts of diluent, and 0-1 part of pH adjuster.

[0009] Furthermore, the modified VAE emulsion is a cellulose derivative modified VAE emulsion.

[0010] Furthermore, the preparation method of the modified VAE emulsion is: VAE emulsion and cellulose derivative are mixed and stirred at a temperature of 20-45° C. for 1-2 hours.

[0011] Furthermore, the modified polyvinyl alcohol is a cyclodextrin-modified polyvinyl alcohol aqueous solution.

[0012] Furthermore, the degree of polymerization of the polyvinyl alcohol is 1200-2000.

[0013] Furthermore, the defoaming agent is white mineral oil or polydimethylsiloxane.

[0014] Furthermore, the bactericide is one or more of hydrogen peroxide, kasone and isothiazolinone.

[0015] Furthermore, the preservative is one or more of hydrogen peroxide, benzoic acid, sorbic acid and potassium sorbate.

[0016] Furthermore, the diluent is deionized water.

[0017] The present invention also provides a method for preparing a nozzle glue for spraying equipment, comprising adding a modified VAE emulsion into a reaction kettle and stirring, adding a bactericide, a defoaming agent, a preservative, a modified polyvinyl alcohol, and a diluent respectively and mixing, adding a pH adjuster to adjust the pH value to between 4.5 and 7, stirring for 30 minutes to 120 minutes, and filling to obtain a finished product.

[0018] The nozzle glue for spraying equipment and the preparation method of the present invention have the following beneficial effects:

[0019] (1) The present invention uses modified VAE emulsion as the basic raw material of the adhesive. The VAE emulsion itself has low surface tension, good rheological properties, good wet viscosity, strong initial adhesion, ultra-low VOC content, and excellent environmental performance.

[0020] (2) The nozzle glue of the present invention has the characteristics of fast drying speed, strong adhesion, good rheological properties, non-toxicity, tastelessness, non-corrosiveness, non-flammability, and storage resistance. VAE is modified by adding cellulose derivatives. The two work together to improve the toughness of the nozzle glue and enhance the rheological properties of the nozzle glue.

[0021] (3) The polyvinyl alcohol added in the present invention is cyclodextrin-modified polyvinyl alcohol. Polyvinyl alcohol is a semi-crystalline linear structure. Due to the presence of hydroxyl groups on the molecular chain, a large number of hydrogen bonds exist within and between the molecules, presenting hard and brittle characteristics. By adding a certain proportion of cyclodextrin, the surface of the cyclodextrin molecule contains more polar functional groups such as hydroxyl groups and carboxyl groups, which can react with the hydroxyl groups on the polyvinyl alcohol chain to form crosslinks, thereby improving and improving its mechanical properties to a certain extent, enhancing the cohesive energy density of polyvinyl alcohol, and using the modified polyvinyl alcohol emulsion product The rheological properties are more prominent and stable.

[0022] (4) The modified VAE emulsion and modified polyvinyl alcohol of the present invention are used as main components, and the two cooperate with each other to further improve the rheological properties of the nozzle glue, and will not cause blockage or uneven coating in the spraying equipment. It has good adhesion, fast drying speed, strong adhesion, good fluidity, non-toxic and tasteless, non-corrosive, non-flammable, and storage-resistant characteristics.

[0023] (5) The present invention uses modified VAE emulsion and modified polyvinyl alcohol as main components, and the preparation method is simple, and the mixed preparation can be achieved at room temperature, avoiding the preparation of conventional adhesives at high temperatures (100° C. or above), reducing the generation of by-products such as volatile organic compounds in the raw materials, being more environmentally friendly, and having lower energy consumption. The various technical performance indicators of the adhesive obtained by the present invention are better than similar products, among which the requirements for non-mouth-touch adhesives, i.e. packaging adhesives, are: formaldehyde ≤15ppm, vinyl acetate ≤100ppm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 is a comparative trend diagram of viscosity and shear rate of Example 1 of the present invention and Comparative Example 1;

[0026] Wherein: the dotted line is Example 1, and the solid line is Comparative Example 1. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] A nozzle glue for spraying equipment comprises the following components, measured in parts by weight: 60-85 parts of modified VAE emulsion, 0-3 parts of defoaming agent, 0-3 parts of bactericide, 0-1 parts of preservative, 5-30 parts of modified polyvinyl alcohol, 10-30 parts of diluent and 0-3 parts of pH regulator.

[0029] It should be further explained that the modified VAE emulsion is a cellulose derivative modified VAE emulsion. The preparation method of the modified VAE emulsion is: VAE emulsion and cellulose derivative are mixed and stirred at a temperature of 20-45°C for 1-2h. The amount of cellulose derivative added is 12% of the mass of the VAE emulsion, and the cellulose derivative is a 5% hydroxyethyl cellulose aqueous solution. The VAE emulsion is selected from DA-144 of Dalian Chemical, Celanese Celvolit 1496 and Wacker EP-6420. Preferably, it is Wacker EP-6420, a VAE emulsion with a dynamic viscosity of 3500-5000mPa.s and a solid content of 54.0-56.0wt.%.

[0030] It should be further explained that the modified polyvinyl alcohol is cyclodextrin modified polyvinyl alcohol. The preparation method of the modified polyvinyl alcohol is to add a polyvinyl alcohol aqueous solution and a cyclodextrin aqueous solution into deionized water, heat it to 90°C, stir it thoroughly to dissolve, and then cool it to room temperature to obtain a modified polyvinyl alcohol aqueous solution.

[0031] The mass ratio of the polyvinyl alcohol aqueous solution to the cyclodextrin aqueous solution is 15-20:1, and the mass ratio of the polyvinyl alcohol aqueous solution to the cyclodextrin aqueous solution is preferably 20:1. The solid content of the polyvinyl alcohol aqueous solution is 15%, the viscosity is 10000mPa·s-35000mPa·s, the polymerization degree of the polyvinyl alcohol is 1200-2000, preferably PVA17-88 or PVA17-99 from Sichuan Vinylon Factory. The mass concentration of the cyclodextrin aqueous solution is 0.1%.

[0032] It should be further explained that the defoaming agent is white mineral oil or polydimethylsiloxane.

[0033] It should be further explained that the bactericide is at least one of hydrogen peroxide, benzoic acid, sorbic acid, potassium sorbate and isothiazolinone, and more preferably isothiazolinone.

[0034] It should be further explained that the preservative is one or more of hydrogen peroxide, benzoic acid, sorbic acid and potassium sorbate.

[0035] It should be further explained that the pH adjuster is one of sodium bicarbonate, sodium carbonate or sodium acetate, and sodium acetate is more preferably used.

[0036] Method Embodiment

[0037] A method for preparing a nozzle glue for spraying equipment comprises the following steps: adding a modified VAE emulsion into a reaction kettle and stirring, respectively adding a bactericide, a defoamer, a preservative, a modified polyvinyl alcohol, and a diluent and mixing them, adding a pH regulator sodium acetate to adjust the pH value to between 4.5 and 7, stirring for 60 minutes, filtering the mixed solution through a 280-mesh filter, and filling to obtain a finished product.

[0038] Product Example 1

[0039] A nozzle glue for spraying equipment comprises the following components: 76 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 17 parts of modified polyvinyl alcohol and 7 parts of deionized water.

[0040] And the adhesive is prepared according to the method example.

[0041] Product Example 2

[0042] A nozzle glue for spraying equipment comprises the following components: 85 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 10 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 30 parts of deionized water.

[0043] And the adhesive is prepared according to the method example.

[0044] Product Example 3

[0045] A nozzle glue for spraying equipment comprises the following components: 80 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 15 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 5 parts of deionized water.

[0046] And the adhesive is prepared according to the method example.

[0047] Product Example 4

[0048] A nozzle glue for spraying equipment comprises the following components: 70 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 15 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 15 parts of deionized water.

[0049] And the adhesive is prepared according to the method example.

[0050] Product Example 5

[0051] A nozzle glue for spraying equipment comprises the following components: 60 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 5 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 10 parts of deionized water.

[0052] And the adhesive is prepared according to the method example.

[0053] Product Example 6

[0054] A nozzle glue for spraying equipment comprises the following components: 65 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 15 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 20 parts of deionized water.

[0055] And the adhesive is prepared according to the method example.

[0056] Product Example 7

[0057] A nozzle glue for spraying equipment comprises the following components: 76 parts of modified VAE emulsion, 0.01 parts of polydimethylsiloxane, 0.02 parts of isothiazolinone, 17 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 7 parts of deionized water.

[0058] And the adhesive is prepared according to the method example.

[0059] Product Example 8

[0060] A nozzle glue for spraying equipment comprises the following components: 76 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of hydrogen peroxide, 17 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 7 parts of deionized water.

[0061] And the adhesive is prepared according to the method example.

[0062] Product Example 9

[0063] A nozzle glue for spraying equipment comprises the following components: 76 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of Kathon, 17 parts of modified polyvinyl alcohol, 0.01 parts of potassium sorbate and 7 parts of deionized water.

[0064] And the adhesive is prepared according to the method example.

[0065] Product Example 10

[0066] A nozzle glue for spraying equipment comprises the following components: 76 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of Kathon, 17 parts of modified polyvinyl alcohol, 0.01 parts of benzoic acid and 7 parts of deionized water.

[0067] And the adhesive is prepared according to the method example.

[0068] Comparative Example 1

[0069] A nozzle glue comprises the following components: 76 parts of modified VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 17 parts of polyvinyl alcohol and 7 parts of deionized water.

[0070] The polyvinyl alcohol aqueous solution in this comparative example has a solid content of 15%, a degree of polymerization of 1200-2000, and a viscosity of 10000 mPa·s-35000 mPa·s, preferably PVA17-88 or PVA17-99 from Sichuan Vinylon Factory.

[0071] And prepare the adhesive according to method example 1.

[0072] Comparative Example 2

[0073] A nozzle glue comprises the following components: 76 parts of VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 17 parts of polyvinyl alcohol and 7 parts of deionized water.

[0074] The polyvinyl alcohol aqueous solution in this comparative example has a solid content of 15%, a degree of polymerization of 1200-2000, and a viscosity of 10000 mPa·s-35000 mPa·s, preferably PVA17-88 or PVA17-99 from Sichuan Vinylon Factory.

[0075] And prepare the adhesive according to method example 1.

[0076] Comparative Example 3

[0077] A nozzle glue comprises the following components: 76 parts of VAE emulsion, 0.01 parts of white mineral oil, 0.02 parts of isothiazolinone, 17 parts of modified polyvinyl alcohol and 7 parts of deionized water.

[0078] And prepare the adhesive according to method example 1.

[0079] Performance Testing

[0080] The nozzle glues obtained in product examples 1-10 and comparative examples 1-3 were tested, and the viscosity test method was determined according to GB / T2794.

[0081] The performance test data is shown in Table 1:

[0082] Table 1 Performance results of nozzle glue

[0083] Group Viscosity Pa·s pH Initial adhesion / s Surface tension mN / M Cigarette factory machine rejection rate % Product Example 1 2100 4.9 20 24 0.015 Product Example 2 2080 4.8 21 28 0.014 Product Example 3 2094 4.8 23 26 0.011 Product Example 4 2072 4.8 22 27 0.015 Product Example 5 2050 4.8 24 25 0.016 Product Example 6 2061 4.8 22 24 0.014 Product Example 7 2099 4.8 21 25 0.018 Product Example 8 2100 4.8 23 26 0.013 Product Example 9 2094 4.8 22 27 0.012 Product Example 10 2098 4.8 24 26 0.014 Comparative Example 1 1925 4.9 31 39.3 0.03 Comparative Example 2 1734 4.9 25 48.2 0.15 Comparative Example 3 1844 4.9 29 44.3 0.11

[0084] It can be seen from Table 1 that referring to product examples 1-10 and comparative examples 1-3, it is shown that modified VAE emulsion and modified polyvinyl alcohol can improve the rheological properties of the product. At the same time, adding a reasonable proportion of modified VAE emulsion and modified polyvinyl alcohol can more efficiently improve the rheological properties of the product and make the spreading ability more uniform.

[0085] Comparison of the surface tension of product example 1 with that of comparative example 1 shows that both the modified VAE emulsion and the modified polyvinyl alcohol can improve the wetting properties of the product.

[0086] Comparing the initial adhesion of product Example 1 with that of Comparative Example 1, it is shown that the modified VAE emulsion and the modified polyvinyl alcohol can improve the initial adhesion of the product and have better bonding stability.

[0087] The nozzle glue obtained in Example 1 and Comparative Example 1 was tested for shear performance and viscosity performance, and the obtained data was plotted as shown in the following graph: Figure 1 As shown. Figure 1 It can be seen that under the same shearing conditions, Example 1 of the present invention has lower viscosity, better flow properties, is less likely to clog the equipment, and spreads more evenly.

[0088] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0089] Finally, it should be noted that the embodiments disclosed in the present invention are only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A nozzle glue for spraying equipment, characterized in that: The invention comprises the following components, calculated in parts by weight: 60-85 parts of modified VAE emulsion, 0-3 parts of defoaming agent, 0-3 parts of bactericide, 0-1 parts of preservative, 5-30 parts of modified polyvinyl alcohol, 10-30 parts of diluent and 0-3 parts of pH regulator.

2. The nozzle glue for spraying equipment according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 60-85 parts of modified VAE emulsion, 0-1 parts of defoaming agent, 0-1 parts of bactericide, 0-1 parts of preservative, 10-20 parts of modified polyvinyl alcohol, 10-25 parts of diluent and 0-1 parts of pH regulator.

3. The nozzle glue for spraying equipment according to claim 1, characterized in that: The modified VAE emulsion is a cellulose derivative modified VAE emulsion.

4. The nozzle glue for spraying equipment according to claim 3, characterized in that: The preparation method of the modified VAE emulsion is as follows: the VAE emulsion and the cellulose derivative are mixed and stirred at a temperature of 20-45° C. for 1-2 hours.

5. The nozzle glue for spraying equipment according to claim 1, characterized in that: The modified polyvinyl alcohol is a cyclodextrin-modified polyvinyl alcohol aqueous solution.

6. The nozzle glue for spraying equipment according to claim 5, characterized in that: The degree of polymerization of polyvinyl alcohol is 1200-2000.

7. The nozzle glue for spraying equipment according to claim 1, characterized in that: The defoaming agent is white mineral oil or polydimethylsiloxane.

8. The nozzle glue for spraying equipment according to claim 1, characterized in that: The bactericide is one or more of hydrogen peroxide, kasone and isothiazolinone.

9. The nozzle glue for spraying equipment according to claim 1, characterized in that: The preservative is one or more of hydrogen peroxide, benzoic acid, sorbic acid and potassium sorbate.

10. A method for preparing a nozzle glue for spraying equipment according to any one of claims 1 to 9, characterized in that: Add the modified VAE emulsion into the reactor and stir, add the bactericide, defoamer, preservative, modified polyvinyl alcohol and diluent respectively and mix, add the pH adjuster to adjust the pH value to between 4.5 and 7, stir for 30 minutes to 120 minutes, and fill to obtain the finished product.

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