Quick-drying type water-based composite adhesive for high-speed cigarettes and preparation method of quick-drying type water-based composite adhesive
By introducing natural rosin acid ester tackifiers and low-temperature film-forming aids into the core-shell polymer network, combined with a quick-drying crosslinker, the problem of unstable initial adhesion layer of water-based adhesives during high-speed cigarette packaging is solved, achieving rapid film formation and high-strength bonding effects, meeting the quality and environmental protection requirements of high-speed production lines.
Patent Information
- Application Number
- CN202511111906.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-08
- Publication Date
- 2025-10-17
AI Technical Summary
Existing water-based adhesives are difficult to form a stable initial adhesive layer in a short period of time during the high-speed cigarette packaging process, resulting in warping, delamination or slippage, and there are problems such as excessive volatile organic compounds and poor weather resistance.
By introducing natural rosin acid ester tackifier into the core-shell polymer network, combined with low-temperature film-forming aids and fast-drying cross-linking agents, the film-forming and cross-linking rates are precisely controlled through pH regulation to form an interpenetrating polymer network, achieving the dual-speed drying effects of surface drying and actual drying in seconds.
Significantly improved shear adhesion and peel strength, ensuring no backflow and sagging on high-speed production lines, improving sealing speed and reliability, meeting the needs of high efficiency and high quality while complying with environmental standards.
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Figure CN120795864A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of composite glue preparation, and particularly relates to a fast-drying water-based composite glue for high-speed cigarette and a preparation method thereof. BACKGROUND
[0002] The cigarette soft packaging and sealing process requires that the adhesive has the comprehensive performance of high speed, high strength and environmental friendliness. With the continuous improvement of the running speed of the packaging production line, the traditional water-based adhesive is difficult to form a stable initial adhesion layer in a short time under the condition of high-speed coating, resulting in quality defects such as edge lifting, delamination or slipping of the packaging material in the conveying, folding and sealing links. In order to meet the requirement of adhesion strength, some existing formulations introduce organic solvents or low molecular aldehyde crosslinking agents to accelerate the drying and curing speed, but such components are easy to cause volatile organic compounds to exceed the standard, and there are potential health and environmental risks. At the same time, the existing water-based glue has poor weather resistance in high temperature and high humidity environment, and the glue layer is easy to have performance attenuation, which affects the storage and logistics adaptability of the product. In view of the rapid packaging and environmental protection demand, some studies use nano fillers or functional additives to improve the film structure and rheological properties, but the process is often complex, the formulation stability is poor and the cost rises. SUMMARY
[0003] In order to solve the problems mentioned in the background, the purpose of the present application is to provide a fast-drying water-based composite glue for high-speed cigarette and a preparation method thereof. By introducing natural rosin acid ester tackifier into the highly crosslinked core-shell polymer network, the rosin acid ester molecules and the polymer chains form an interpenetrating polymer network at the molecular level, greatly improving the shear adhesion and peel strength. The low-temperature film-forming additive and the fast-drying crosslinking agent are used cooperatively, and the film-forming and crosslinking rates of the two are precisely controlled by pH regulation, realizing the double-speed drying effect of second-level surface drying and real drying. This technology takes into account the film-forming speed, adhesion strength and durability, meeting the dual demands of efficiency and quality of modern high-speed cigarette production line.
[0004] The purpose of the present application can be achieved by the following technical solutions:
[0005] A fast-drying water-based composite glue for high-speed cigarette, comprising the following raw materials in parts by weight: core-shell polymer emulsion 50-60 parts; low-temperature film-forming additive 3-5 parts; fast-drying crosslinking agent 2-4 parts; natural resin tackifier 5-7 parts; nano-silicon dioxide thickening agent 0.5-1.5 parts; pH regulator 0.5-1 parts; preservative and antibacterial agent 0.1-0.3 parts.
[0006] Further preferably, the particle size of the nano-silicon dioxide thickening agent is 10-20 nm.
[0007] Further preferably, the fast-drying crosslinking agent is polyhydroxymethyl aminomethyl ester.
[0008] Further preferably, the natural resin tackifier is one or more of rosin acid esters, rosin alcohol acid esters, and rosin acid glycerides.
[0009] Further preferably, after the esterification reaction of the trimethylol aminomethane and the acid anhydride, the product obtained after purification is the desired fast-drying crosslinking agent.
[0010] Further preferably, the composite adhesive is a full water-based environmentally friendly formula, which meets the green manufacturing standards, has no low-grade aldehyde and organic solvent residues, and has a volatile compound content of ≤5 g / L.
[0011] Further preferably, the low-temperature film-forming aid is a hydroxyethyl cellulose derivative.
[0012] A preparation method of a fast-drying water-based composite adhesive for high-speed cigarettes comprises the following steps:
[0013] S1. Under the protection of inert gas, monomer emulsion is subjected to staged emulsion polymerization in an aqueous phase, and a polymer emulsion with a core-shell structure is obtained through temperature control and initiator addition to form high molecular particles with fast film-forming properties;
[0014] S2. A low-temperature film-forming aid, a fast-drying crosslinking agent, a natural resin tackifier, and a nano-silica thickening agent are sequentially added to the emulsion obtained in S1, and through sufficient stirring and dispersion, the components are uniformly distributed in the emulsion;
[0015] S3. The above mixed solution is adjusted to a suitable pH range and continues to be homogenized to promote the reactivity of the low-temperature film-forming aid and the fast-drying crosslinking agent, and then the mixture is cooled to room temperature to obtain the fast-drying water-based composite adhesive for high-speed cigarettes.
[0016] Further preferably, the preparation method of the core-shell structure polymer emulsion in step S1 specifically comprises the following steps:
[0017] S101. In a nitrogen-protected aqueous phase, an emulsifier is added and the reaction temperature is controlled to a suitable range; then slowly stirring, adding butyl acrylate and methyl methacrylate monomers in stages, while using potassium persulfate as an initiator to start the polymerization reaction, and adjusting the temperature and stirring rate in a timely manner according to the heat release during polymerization to form high molecular "core" stage latex particles with uniform size distribution;
[0018] S102. After the obtained polymerization liquid is cooled, ethylene-vinyl acetate copolymer emulsion is added in batches, and then glutaraldehyde derivative is introduced as a crosslinking monomer to promote the formation and crosslinking of the shell layer under the conditions of continuous stirring and temperature control, so that a weather-resistant stable "shell" structure is formed on the surface of the polymer particles, thereby obtaining a polymer emulsion with a core-shell double function.
[0019] The present application has the following advantages:
[0020] The present application combines fast film formation, strong adhesion and environmental stability by the combination of core-shell polymer emulsion and synergistic adjuvant. When sprayed on the surface of the substrate, the outer shell component rapidly loses water and crosslinks to form a continuous film in a short time, while the internal core region further crosslinks with the natural resin molecular network, and the natural rosin ester forms an interpenetrating network structure in the core-shell polymer network, giving both tack and fast drying, achieving high shear and high peel strength while the sealing speed is not affected, thereby significantly better than the prior art using only rosin tackifier or only core-shell emulsion. The nanometer thickening agent and the flow aid compound synergistically build a micron-level three-dimensional network, optimizing the rheological behavior, ensuring no backflow and sagging phenomenon in the high-speed coating process, while maintaining the uniformity of the glue layer during curing. Low temperature film forming agent can quickly form a primary film at room temperature, and fast drying crosslinking agent crosslinks efficiently under pH regulation, and the glue layer completes the skin dry and dry in a very short time under the synergistic action of the two, significantly improving the sealing speed and reliability of the production line. BRIEF DESCRIPTION OF DRAWINGS
[0021] The present application will be further described below in conjunction with the accompanying drawings.
[0022] Figure 1 The microstructure of the core-shell structure polymer emulsion of the fast-drying water-based composite adhesive for high-speed cigarette in the example is shown in the schematic diagram. The gray part represents the internal butyl acrylate / methyl methacrylate polymer core, and the outer shell is composed of ethylene-vinyl acetate copolymer and glutaraldehyde crosslinking network. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0024] Example 1
[0025] I. Preparation of core-shell structure polymer emulsion
[0026] Take 1000g of deionized water and place it in a 2L stirring reaction kettle, replace oxygen with nitrogen for 30min, keep stirring at 200rpm, slowly add 10g of non-ionic emulsifier at 70℃, and keep stirring evenly.
[0027] The core latex particles were obtained by adding 350 g of butyl acrylate and 150 g of methyl methacrylate in a mass ratio of 7:3 into a reaction kettle in batches, keeping the temperature at 70°C during the dropping process, adding 10 g of potassium persulfate initiator, maintaining the temperature at 70°C and stirring at 250 rpm for 2 h.
[0028] The reaction temperature was lowered to 60°C, and nitrogen was continuously introduced to maintain an inert environment. A total of 250 g of ethylene-vinyl acetate copolymer emulsion (about 40% of the mass of the core latex particles) was added in three portions, and stirred for 10 min after each addition. 5 g of isopropyl alcohol chain transfer agent (about 0.5% of the mass of the emulsion) and 15 g of glutaraldehyde derivative (about 3% of the mass of the monomers) were added. The reaction was carried out at 60°C and 300 rpm for 1 h to form a stable shell layer.
[0029] The reaction solution was naturally cooled to 30°C, 1 g of antioxidant BHT was added and stirred for 10 min to prevent oxidation of the emulsion, the pH was adjusted to 7.0-7.5, about 2 g of polyethylene glycol 400 was used as a stabilizer, stirred for 15 min, and filtered through a 0.45 μm membrane or centrifuged at 5000 rpm for 10 min to remove unreacted monomers and impurities. Finally, a core-shell structured polymer emulsion with a particle size distribution of 100-200 nm was obtained.
[0030] II. Preparation of a fast-drying water-based composite adhesive for high-speed cigarette production
[0031] The fast-drying water-based composite adhesive for high-speed cigarette production comprises the following raw materials by weight: core-shell structured polymer emulsion 50 parts, hydroxyethyl cellulose derivative 3 parts, polyhydroxymethyl aminomethyl ester 2 parts, natural resin tackifier 5 parts, nano-silicon dioxide thickening agent 0.5 parts, polyethylene glycol monomethyl ether methacrylate 0.5 parts, pH adjuster 0.5 parts, preservative and antibacterial agent 0.1 parts.
[0032] The preparation steps are as follows: take 50 g of core-shell structured polymer emulsion, add 3 g of hydroxyethyl cellulose derivative, 2 g of polyhydroxymethyl aminomethyl ester, 5 g of natural resin tackifier, and 0.5 g of nano-SiO2, and stir at 40°C for 30 min.
[0033] Adjust the pH to 7.5, and then add 0.5 g of polyethylene glycol monomethyl ether methacrylate and 0.1 g of preservative, respectively. After homogenization for 15 min, cool to 25°C to obtain the fast-drying water-based composite adhesive.
[0034] Example 2
[0035] The preparation method of the core-shell structured polymer emulsion is the same as that of Example 1.
[0036] The preparation method of the fast-drying water-based composite adhesive for high-speed cigarette production is as follows:
[0037] The high-speed cigarette fast-drying water-based composite glue includes the following raw materials by weight: core-shell structure polymer emulsion 60 parts, hydroxyethyl cellulose derivative 5 parts, polyhydroxymethyl aminomethyl methane ester 4 parts, natural resin tackifier 7 parts, nano silicon dioxide thickening agent 1.5 parts, polyethylene glycol monomethyl ether methacrylate 1 part, pH regulator 1 part, preservative and antibacterial agent 0.3 parts.
[0038] The preparation steps are as follows: 60 g of core-shell structure polymer emulsion is taken, 5 g of hydroxyethyl cellulose derivative, 4 g of polyhydroxymethyl aminomethyl methane ester, 7 g of natural resin tackifier, and 1.5 g of nano SiO2 are added, and stirring is carried out at 45°C for 45 min. The pH is adjusted to 8.0, 1 g of polyethylene glycol monomethyl ether methacrylate and 0.3 g of preservative are added in sequence, homogenization is carried out for 20 min, and then cooling is carried out to 25°C, and the fast-drying water-based composite glue is obtained.
[0039] Example 3
[0040] The preparation method of the core-shell structure polymer emulsion is the same as that in Example 1.
[0041] The preparation method of the high-speed cigarette fast-drying water-based composite glue is as follows:
[0042] The high-speed cigarette fast-drying water-based composite glue includes the following raw materials by weight: core-shell structure polymer emulsion 60 parts, hydroxyethyl cellulose derivative 5 parts, polyhydroxymethyl aminomethyl methane ester 4 parts, natural resin tackifier 7 parts, nano silicon dioxide thickening agent 1.5 parts, polyethylene glycol monomethyl ether methacrylate 1 part, pH regulator 1 part, preservative and antibacterial agent 0.3 parts.
[0043] The preparation steps are as follows: 55 g of core-shell emulsion is preheated at 40°C, 4 g of hydroxyethyl cellulose derivative, 3 g of polyhydroxymethyl aminomethyl methane ester, 6 g of rosin acid ester, and 1 g of nano SiO2 are added, stirring is carried out at 40°C for 30 min, the pH is adjusted to 7.8, 0.75 g of polyethylene glycol monomethyl ether methacrylate and 0.2 g of preservative are added, homogenization is carried out for 20 min, and then cooling is carried out to 25°C, and the fast-drying water-based composite glue is obtained.
[0044] Comparative Example 1
[0045] The preparation method of the high-speed cigarette fast-drying water-based composite glue is as follows:
[0046] The high-speed cigarette fast-drying water-based composite glue includes the following raw materials by weight: polyvinyl acetate emulsion 55 parts, hydroxyethyl cellulose derivative 4 parts, polyhydroxymethyl aminomethyl methane ester 3 parts, natural resin tackifier 6 parts, nano silicon dioxide thickening agent 1 part, polyethylene glycol monomethyl ether methacrylate 0.75 parts, triethanolamine 0.75 parts, preservative and antibacterial agent 0.2 parts.
[0047] The preparation steps are as follows: 55 g of polyvinyl acetate emulsion is preheated at 40°C, 4 g of hydroxyethyl cellulose derivative, 3 g of polyhydroxymethyl aminomethane ester, 6 g of rosin acid ester, and 1 g of nano-SiO2 are added, and stirred at 40°C for 30 min; the pH is adjusted to 7.8, 0.75 g of polyethylene glycol monomethyl ether methacrylate and 0.2 g of preservative are added, homogenized for 20 min and cooled to 25°C, and the fast-drying water-based composite adhesive is obtained.
[0048] Comparative Example 2
[0049] The preparation method of the fast-drying water-based composite adhesive for high-speed cigarette is as follows:
[0050] The fast-drying water-based composite adhesive for high-speed cigarette comprises the following raw materials by weight: 55 parts of core-shell polymer emulsion, 4 parts of hydroxyethyl cellulose derivative, 3 parts of polyhydroxymethyl aminomethane ester, 6 parts of natural resin tackifier, 1 part of nano-silica thickening agent, 1 part of polyethylene glycol dimethyl ether dimethacrylate, 0.75 parts of triethanolamine, 0.2 parts of preservative and antibacterial agent.
[0051] The preparation steps are as follows: 55 g of core-shell emulsion is preheated at 40°C, 4 g of hydroxyethyl cellulose derivative, 3 g of polyhydroxymethyl aminomethane ester, 6 g of rosin acid ester, and 1 g of nano-SiO2 are added, and stirred at 40°C for 30 min; the pH is adjusted to 7.8, 1 g of polyethylene glycol dimethyl ether dimethacrylate and 0.2 g of preservative are added, homogenized for 20 min and cooled to 25°C, and the fast-drying water-based composite adhesive is obtained.
[0052] Performance detection
[0053] In order to evaluate the comprehensive performance of the fast-drying water-based composite adhesive for high-speed cigarette of the present application, the samples of Examples 1-3 and Comparative Examples 1-2 are tested according to the following methods:
[0054] 1. Adhesion performance detection
[0055] According to GB / T4852.2-2002, the initial adhesion is tested by using the initial adhesion instrument of inclined plane and ball, the steel ball is released from a prescribed height on the inclined plane with a slope of 30°, and the maximum size of the steel ball that can be adhered by the water-based composite adhesive is used to evaluate the initial adhesion of the water-based composite adhesive.
[0056] The holding adhesion force is tested according to the standard GB / T4851-1998, the standard rust steel plate adhered with the water-based composite adhesive is vertically hung on the holding adhesion tester, a 1 kg weight is hung for a period of time, and the time when the sample falls off is recorded.
[0057] The 180° peeling strength is tested according to the standard GB2792-81, the universal electronic tensile testing machine is used to peel at a speed of 300 mm / min, and the average peeling strength is obtained. The test results are shown in Table 1.
[0058] Table 1 Test results of the adhesive properties of the fast-drying water-based composite adhesive for high-speed cigarette
[0059]
[0060] As shown in Table 1, the fast-drying water-based composite adhesive for high-speed cigarette prepared by Examples 1-3 has good adhesive properties. In the initial adhesion index, Example 3 can stick a steel ball with a diameter of 10 mm, far exceeding the comparative examples, indicating that the core-shell structure forms a higher adhesive force in the rapid film formation stage. The holding adhesion test shows that Example 3 can sustain 8 h under a vertical load of 1 kg, which is nearly twice that of Comparative Examples 1 and 2, verifying the interface strengthening mechanism of the interpenetrating network formed by natural rosin acid ester and high molecular network, effectively enhancing the sustained adhesion performance before peeling. In terms of 180° peeling strength, Example 3 reaches 1.40 N / 15 mm, which is also significantly better than the comparative sample, further proving the strength improvement of the adhesive layer under the synergistic effect of high-density crosslinking and tackifying components.
[0061] 2. Holding adhesion and holding adhesion retention rate after wet heat aging
[0062] According to GB / T4851-2002, the fast-drying water-based composite adhesive for high-speed cigarette is uniformly coated on a standard stainless steel plate, a vertical load of 1 kg is applied, the device is placed in a 23℃ / 50%RH environment, and the time taken for the sample to slide to complete detachment is recorded.
[0063] The fast-drying water-based composite adhesive for high-speed cigarette is placed in a 40℃ / 85%RH aging oven for 48 h, then the above steps are repeated and the time taken for the sample to slide to complete detachment is recorded. The test results are shown in Table 2.
[0064] Table 2 Test results of the holding adhesion and retention rate of the fast-drying water-based composite adhesive for high-speed cigarette
[0065]
[0066] As shown in Table 2, the fast-drying water-based composite adhesive for high-speed cigarette prepared by Examples 1-3 has good holding adhesion and high holding adhesion retention rate after wet heat aging. The initial holding adhesion time of Example 3 is the longest, and it still maintains 7.6 hours after aging, with a retention rate of up to 95%, which benefits from the interpenetrating network formed by the highly crosslinked core region in the core-shell structure and the rosin acid ester tackifier, which can still maintain good interface bonding force under high temperature and high humidity conditions. The three-dimensional support network constructed by nano-silica thickening agent enhances the structural stability of the adhesive layer, inhibiting the relaxation and backflow of the polymer chain during the aging process. In contrast, the comparative sample does not use the core-shell and interface interpenetrating network design, with a retention rate of only 78-80%, and the holding adhesion time is significantly insufficient.
[0067] 3. Viscosity stability test
[0068] According to GB / T 13477-2012, the initial viscosity of the water-based composite adhesive for high-speed cigarette was measured at 25°C using a Brookfield rotational viscometer (spindle No. 3, 100 rpm). After the same adhesive sample was placed in a sealed container at room temperature for 7 days, the viscosity after 7 days was measured under the same conditions and the viscosity change rate after 7 days was calculated. The test results are shown in Table 3 below.
[0069] Table 3 Viscosity stability test results of fast-drying water-based composite adhesive for high-speed cigarette
[0070] Sample Initial viscosity (mPa-s) 7d viscosity change rate (%) Example 1 15000 2.2 Example 2 14500 1.8 Example 3 14600 1.5 Comparative Example 1 16000 3.5 Comparative Example 2 15800 3.0
[0071] As can be seen from Table 3, the initial viscosity of the fast-drying water-based composite adhesive for high-speed cigarette prepared in Example 3 is the lowest, and the seven-day change rate is only 1.5%, which is lower than that of the comparative examples. This stability is derived from the multi-level network enhancement of the core-shell structure polymer emulsion and the nano-silica thickening agent, as well as the interfacial modification of the polyethylene glycol monomethyl ether methacrylate flow aid component. These components synergistically inhibit the phase separation of high molecular chains and particle agglomeration, ensuring that the adhesive remains uniformly dispersed and stable in flow after long-term standing. The absence of such micro-network and flow aid mechanisms in the comparative example formulations results in significant viscosity drift.
[0072] 4. Drying time test
[0073] The adhesive was uniformly coated on a glass plate with a spatula, and the coating amount was 10 g / m2. Every 0.5 s, the surface of the adhesive layer was lightly touched once with a plastic spatula or a clean finger until no marks or adhesive attachment was left, which was recorded as the "surface dry time". The observation was continued until the spatula indentation could no longer stick to the adhesive layer, which was recorded as the "hard dry time". The test results are shown in Table 4 below.
[0074] Table 4 Drying time test results
[0075] Sample Tack-free time (s) Hard dry time (s) Example 1 5.0 15.0 Example 2 3.0 10.0 Example 3 2.5 8.0 Comparative Example 1 10.0 30.0 Comparative Example 2 8.0 25.0
[0076] As can be seen from the above table, the surface dry time of the fast-drying water-based composite adhesive for high-speed cigarette prepared in Example 3 is only 2.5 seconds, and the hard dry time is 8.0 seconds, which is 75% and 68% shorter than that of the fast-drying water-based composite adhesive for high-speed cigarette prepared in Comparative Example 1 and Comparative Example 2, respectively. The rapid drying effect is due to the fact that the low-temperature film-forming aid can rapidly lose water to form an initial film at room temperature, and the polyhydroxymethyl aminomethyl methacrylate crosslinking agent activated by pH control is efficiently crosslinked and cured within a few seconds. The two closely cooperate to achieve the "surface dry - hard dry" dual-speed drying effect.
[0077] In summary, the high-speed cigarette fast-drying water-based composite glue prepared by the embodiment of the application has rapid film formation, fast surface viscosity growth, can complete initial adhesion and fast curing in a short contact time, meets the strict requirement of high-speed cigarette packaging on fast drying performance, significantly improves production efficiency and reduces energy consumption and standby time.
[0078] In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0079] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only illustrative of the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.
Claims
1. A fast-drying water-based composite adhesive for high-speed cigarettes, characterized in that: The invention comprises the following raw materials in parts by weight: 50-60 parts of core-shell polymer emulsion; 3-5 parts of low-temperature film-forming aid; 2-4 parts of quick-drying cross-linking agent; 5-7 parts of natural resin tackifier; 0.5-1.5 parts of nano-silica thickener; 0.5-1 part of pH regulator; and 0.1-0.3 parts of preservative and antibacterial agent.
2. The fast-drying water-based composite adhesive for high-speed cigarettes according to claim 1, characterized in that: The particle size of the nano-silicon dioxide thickener is 10 to 20 nm.
3. The fast-drying water-based composite adhesive for high-speed cigarettes according to claim 1, characterized in that: The quick-drying cross-linking agent is polyhydroxymethylaminomethane ester.
4. The fast-drying water-based composite adhesive for high-speed cigarettes according to claim 1, characterized in that: The natural resin tackifier is one or more of rosin acid esters, rosin alcohol acid esters, and rosin acid glycerides.
5. The fast-drying water-based composite adhesive for high-speed cigarettes according to claim 1, characterized in that: The quick-drying cross-linking agent is prepared by the following steps: tris(hydroxymethyl)aminomethane is subjected to an esterification reaction with an acid anhydride, and then the product obtained by purification is the desired quick-drying cross-linking agent.
6. The fast-drying water-based composite adhesive for high-speed cigarettes according to claim 1, characterized in that: The composite adhesive is a fully water-based environmentally friendly formula that meets green manufacturing standards, has no low-level aldehydes and organic solvent residues, and has a volatile compound content of ≤5g / L.
7. The fast-drying water-based composite adhesive for high-speed cigarettes according to claim 1, characterized in that: The low-temperature film-forming aid is a hydroxyethyl cellulose derivative.
8. A method for preparing a fast-drying water-based composite adhesive for high-speed cigarettes, wherein the fast-drying water-based composite adhesive for high-speed cigarettes is as described in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Under inert gas protection, the monomer emulsion is subjected to staged emulsion polymerization in an aqueous phase. By controlling the temperature and adding an initiator, a polymer emulsion having a core-shell structure is obtained to form polymer particles with rapid film-forming properties. S2. The low-temperature film-forming agent, quick-drying crosslinker, natural resin tackifier and nano-silica thickener are sequentially added to the emulsion obtained in S1, and the components are uniformly distributed in the emulsion by sufficient stirring and dispersion; S3. The mixed solution is adjusted to an appropriate pH range and further homogenized to promote the reaction activity of the low-temperature film-forming agent and the fast-drying cross-linking agent, and then the mixture is cooled to room temperature to obtain the fast-drying water-based composite adhesive for high-speed cigarettes.
9. The method for preparing the fast-drying water-based composite adhesive for high-speed cigarettes according to claim 7, characterized in that: The method for preparing the core-shell structure polymer emulsion in step S1 specifically comprises the following steps: S101. An emulsifier is added to the nitrogen-protected aqueous phase and the reaction temperature is controlled to an appropriate range. Subsequently, butyl acrylate and methyl methacrylate monomers are added dropwise in stages with slow stirring. A polymerization reaction is initiated using potassium persulfate as an initiator. During the polymerization process, the temperature and stirring rate are adjusted according to the heat release of the reaction to form polymer "core" latex particles with a uniform size distribution. S102. After cooling the obtained polymer solution, ethylene-vinyl acetate copolymer emulsion is added in batches, followed by the introduction of a glutaraldehyde derivative as a cross-linking monomer. Under conditions of continuous stirring and temperature control, the formation of the shell layer and cross-linking curing are promoted, so that a weather-resistant and stable "shell" structure is formed on the surface of the polymer particles, thereby obtaining a polymer emulsion with dual core-shell functions.