A fast-cooling heat-sealing adhesive for emulsion explosive packaging film and its application

Abstract

The invention discloses a kind of fast cooling emulsion explosive packaging film heat-sealing adhesive and its application, the heat-sealing adhesive includes 40~45 parts of ethylene-octene elastomers, 15~20 parts of polyethylene wax, 25~30 parts of resins, 25~30 parts of hyperbranched polymers, and 1.0~1.5 parts of anti-oxidation according to parts by weight; the hyperbranched polymer improves cohesive strength by internal hydrogen bond, and external olefin and PO film have better bonding strength, and overall hyperbranched structure has lower melting point and viscosity and can better wet PO film surface. The heat-sealing adhesive of the present invention can both reach the bonding strength reached by high-temperature heat-sealing adhesive at a lower glue application temperature, so as to reach the purpose of fast cooling in the case of reducing glue application temperature and without reducing bonding strength.

Description

[0001] The invention belongs to the technical field of adhesives, and in particular relates to a fast-cooling heat-sealing adhesive for emulsion explosive packaging films. Background Art

[0002] Emulsion explosives utilize an emulsifier to evenly disperse droplets of an aqueous solution of an oxidizer salt in an oil-phase continuous medium containing porous materials such as dispersed bubbles or hollow glass microspheres, forming a water-in-oil latex explosive. Due to its water-in-oil form, it needs to be wrapped in a polyolefin (PO) film for transportation and use. Although PO film itself can achieve a certain degree of adhesion through heat sealing, PO film is a composite material of low-density polyethylene, high-density polyethylene, and polypropylene, which often requires a higher gluing temperature, and the bonding strength and sealing properties do not meet the requirements. Considering the special properties and production efficiency of emulsion explosives, it is often necessary to add heat-sealing adhesive to reduce the gluing temperature, while using a cooling device to quickly cool the bond.

[0003] Common hot melt adhesives include ethylene vinyl acetate copolymer (EVA) hot melt adhesive, polyamide (PA) hot melt adhesive, polyolefin (PO) hot melt adhesive, polyurethane (PUR) hot melt adhesive, reactive hot melt adhesive, and pressure-sensitive hot melt adhesive. Polyolefin hot melt adhesives offer good bonding strength to PO film, but low molecular weight polyolefin hot melt adhesives inherently have low cohesive strength and are therefore relatively weak. High molecular weight polyolefin hot melt adhesives, while increasing cohesive strength, also require high application temperatures. Patent CN215551005U provides a device that efficiently cools the temperature of a 240°C hot melt adhesive to below 100°C within 2 seconds. EVA hot melt adhesive is the most commonly used hot melt adhesive in the traditional packaging industry, offering a short curing time, low application temperature, and excellent bonding properties. However, PO film is a composite material of low-density polyethylene, high-density polyethylene, and polypropylene, with low polarity and low surface energy. The polar molecules in EVA hot melt adhesive contribute to its inherently high surface energy, resulting in poor wetting of PO film and a consequently low bonding strength. Therefore, a heat-sealing adhesive with high cohesive strength, good wetting ability, strong bonding force with the interface surface of the PO film and low gluing temperature is needed for heat sealing of emulsion explosive packaging film. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a hot melt adhesive for emulsion explosive packaging film that can be quickly cooled and is incorporated with a hyperbranched polymer, wherein the hyperbranched polymer improves the cohesive strength through internal hydrogen bonds, the external olefin has better bonding strength with the PO film, and the overall hyperbranched structure has a lower melting point and viscosity, which can better wet the PO film surface.

[0005] The technical solution for achieving the purpose of the present invention is as follows: a fast-cooling heat-sealing adhesive for emulsion explosive packaging film, wherein the heat-sealing adhesive comprises, by weight, 40 to 45 parts of ethylene-octene elastomer, 15 to 20 parts of polyethylene wax, 25 to 30 parts of resin, 25 to 30 parts of hyperbranched polymer, and 1.0 to 1.5 parts of antioxidant; and the hyperbranched polymer is prepared by the following method:

[0006] In an inert gas atmosphere, 10 to 15 eq of a hydroxy acrylate monomer, 1 to 3 eq of a double-terminated acrylamide polyethylene glycol monomer, 0.2 to 0.3 eq of 2-bromo-2-methyl-N-(3-(triethoxysilyl)propyl)propionamide, 0.4 to 0.6 eq of cuprous bromide, and 40 to 50 eq of anhydrous anisole are added to a Shrek flask. After freeze-thawing and degassing, 0.6 to 0.8 eq of N,N,N',N",N"-pentamethyldiethylenetriamine is added. After stirring at 50 to 60° C. for 30 to 60 minutes, 3 to 5 eq of an acrylate monomer is added and stirring is continued for 30 to 60 minutes. After the reaction is completed, oxygen is introduced to terminate the reaction. Copper ions are removed by column chromatography. The resulting solution is concentrated, precipitated in cold methanol, filtered, and the solid product is collected and dried to obtain a hyperbranched polymer.

[0007] Preferably, the ethylene-octene elastomer has a melting point of 65-75°C; the resin is a petroleum resin with a melting point of 70-110°C; the polyethylene wax has an average molecular weight of 3000-3500 and a melting point of 100-120°C; and the antioxidant is one or more of antioxidant 1010, antioxidant 2246, and hindered amine light stabilizer.

[0008] The melting points of the ethylene-octene elastomer, petroleum resin and polyethylene wax are all measured by differential scanning calorimetry at a heating rate of 10° C. / min.

[0009] More preferably, the antioxidant is antioxidant 1010.

[0010] Preferably, the hydroxy acrylate monomer is at least one of hydroxyethyl acrylate and hydroxyethyl methacrylate.

[0011] More preferably, the acrylamide monomer is hydroxyethyl acrylate.

[0012] Preferably, the double-terminated acrylamide polyethylene glycol monomer has at least one of the following molecular structures:

[0013] wherein n=5 to 20. More preferably, the double-terminated acrylamide polyethylene glycol monomer has the following molecular structure:

[0014] More preferably, n=5-9 in the formula.

[0015] Specifically, the double-terminated acrylamide polyethylene glycol monomer can be a commercially available product or homemade, and the homemade method is as follows:

[0016] Under a nitrogen atmosphere, add 1 eq of polyethylene glycol, 3-5 eq of p-toluenesulfonyl chloride, and 3-5 eq of triethylamine to a Shrek flask. Use dichloromethane as the solvent and stir at 50-60°C for 10-12 hours until the reaction is complete. Wash the mixture three times with 1 eq / L hydrochloric acid solution and then three times with 1 eq / L sodium hydroxide solution. Collect the organic phase and evaporate.

[0017] The obtained product was dissolved in ammonia water, stirred at room temperature for three days, and then 2 eq / L sodium hydroxide aqueous solution was added and stirred for 1 to 2 hours. The mixture was extracted with dichloromethane three times, and the organic phase was collected and evaporated to obtain double-terminated aminoethylene glycol;

[0018] Under a nitrogen atmosphere, 1 eq of double-terminated aminoethylene glycol, 1.5-2.0 eq of triethylamine, and 20 eq of anhydrous toluene were added to a three-necked flask. 4.0-5.0 eq of methacryloyl chloride was dissolved in 25 eq of anhydrous toluene under ice bath conditions and then slowly added dropwise to the reactor. The reaction was stirred at room temperature for 36 hours, filtered, and the resulting solution was concentrated. 30 eq of dichloromethane was added and washed three times with 1 eq / L hydrochloric acid solution. The organic phase was collected and evaporated to obtain a double-terminated acrylamide polyethylene glycol monomer.

[0019] Preferably, the acrylate monomer has at least one of the following molecular structures:

[0020] Wherein m=5~29.

[0021] More preferably, the acrylate monomer has the following molecular structure of Formula III:

[0022] More preferably, m=14-29.

[0023] Specifically, the acrylate monomer can be a commercially available product or homemade, and the homemade method is as follows:

[0024] Under a nitrogen atmosphere, 1.0 eq of a linear alkyl alcohol, 1.5-2.0 eq of triethylamine, and 20-25 eq of anhydrous toluene were added to a three-necked flask. 1.5-2.0 eq of methacryloyl chloride was dissolved in 20 eq of anhydrous toluene at 0°C and then slowly added dropwise to the reactor. The reaction was stirred at 30°C for 36 hours, filtered, and the resulting solution was concentrated, dissolved in dichloromethane, and washed three times with aqueous sodium hydroxide solution. The organic phase was collected and evaporated to obtain an acrylate monomer.

[0025] The present invention also provides a method for preparing a fast-cooling heat-sealing adhesive, comprising the following steps:

[0026] Stir polyethylene wax and antioxidant at 100-120°C for 8-10 minutes to completely melt them, add ethylene-octene elastomer, raise the temperature to 130-140°C and stir for 10-20 minutes, then add hyperbranched polymer and resin in sequence, and continue stirring at 90-100°C for 30-40 minutes to obtain a basically transparent and bubble-free mixture, put it into a mold and cool it down to obtain a heat-sealing adhesive.

[0027] Another object of the present invention is to protect the application of the heat-sealing adhesive in emulsion explosive packaging film.

[0028] Preferably, the application temperature of the heat-sealing adhesive when heat-sealing the emulsion explosive packaging film is 100-130°C.

[0029] Beneficial effects

[0030] The present invention has the following beneficial effects: The present invention provides a fast-cooling heat-sealing adhesive for emulsion explosive packaging film, wherein the heat-sealing adhesive incorporates a hyperbranched polymer, which acts to quickly cool the emulsion explosive packaging film by reducing the gluing temperature. The hyperbranched polymer improves cohesive strength through internal hydrogen bonds, eliminating the need to increase molecular weight and thus excessively high gluing temperatures. The external olefins provide improved bonding strength with the PO film, and the overall hyperbranched structure has a lower melting point and viscosity, enabling better wetting of the PO film surface. The small amount of siloxane groups in the structure allows the hot melt adhesive to hydrolyze upon contact with moisture in the air over time after heat sealing, reacting with silanols or hydroxyl groups to form a cross-linked structure, further enhancing sealing and bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the synthesis route of the hyperbranched polymer of the present invention;

[0032] Figure 2 This is the H NMR spectrum of the acrylate monomer 2 of the present invention.

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0035] The raw materials and equipment used in the embodiments and comparative examples are described below:

[0036] Ethylene-octene elastomer: brand 8452, melting point 66°C, Dow Plastics;

[0037] Polyethylene wax: brand Q-111, melting point 110-120°C, average molecular weight 3500, Qingdao Zhongsu;

[0038] Resin: Petroleum resin, hydrogenated C9 resin, melting point 70-110°C, product number SYSZ02, Jinan Shanhai Chemical Technology;

[0039] Antioxidant 1010: Product No. KYJ01, Jinan Shanhai Chemical Technology;

[0040] Amorphous polyolefin (APAO): melting point 87-100°C; Qingdao Zhongsu;

[0041] Commercially available polyolefin hot melt adhesive: Henkel polyolefin hot melt adhesive, brand name Technomelt Q 5303, gluing temperature 170-200°C;

[0042] Hydroxyethyl acrylate: Product No. H885997, purchased from Shanghai MacLean Biochemical Technology;

[0043] Polyethylene glycol 1: average molecular weight 200, product number P815604, purchased from Shanghai MacLean Biochemical Technology;

[0044] Polyethylene glycol 2: average molecular weight 300, product number P815612, purchased from Shanghai MacLean Biochemical Technology;

[0045] Polyethylene glycol 3: average molecular weight 400, product number P815616, purchased from Shanghai MacLean Biochemical Technology;

[0046] Acryloyl chloride: Product No. A800376, purchased from Shanghai MacLean Biochemical Technology;

[0047] 2-Bromo-2-methyl-N-(3-(triethoxysilyl)propyl)propionamide: purchased from Weifang Xiaoyuan Chemical Economic and Trade Co., Ltd.

[0048] Cuprous bromide: Product No. C804582, purchased from Shanghai MacLean Biochemical Technology;

[0049] N,N,Nˋ,Nˋ,Nˋˋ-Pentamethyldiethylenetriamine: Product No. N822749, purchased from Shanghai MacLean Biochemical Technology;

[0050] 1-Pentadecanol: Product No. P815838, purchased from Shanghai MacLean Biochemical Technology;

[0051] 1-Pentacosanol: Product No. 26188, purchased from Shandong West Asia Chemical;

[0052] 1-Triacontanol: Product No. T819625, purchased from Shanghai MacLean Biochemical Technology;

[0053] Double-terminated acrylamide polyethylene glycol monomer 1: homemade, preparation method is as follows:

[0054] Under nitrogen, add 1 eq of polyethylene glycol 1 (average molecular weight 200), 3 eq of p-toluenesulfonyl chloride, and 3 eq of triethylamine to a Shrek flask with dichloromethane as the solvent. Stir at 50°C for 10 h until the reaction is complete. Wash three times with 1 eq / L hydrochloric acid solution and then three times with 1 eq / L sodium hydroxide solution. Collect the organic phase and evaporate.

[0055] The obtained product was dissolved in ammonia water, stirred at room temperature for three days, and then 2 eq / L sodium hydroxide aqueous solution was added and stirred for 2 hours. The mixture was extracted three times with dichloromethane, and the organic phase was collected and evaporated to obtain a double-terminated amino glycol with an average molecular weight of 200.

[0056] Under a nitrogen atmosphere, 1 eq of double-terminated aminoethylene glycol with an average molecular weight of 200, 2.0 eq of triethylamine, and 20 eq of anhydrous toluene were added to a three-necked flask. 5.0 eq of methacryloyl chloride was dissolved in 25 eq of anhydrous toluene under ice bath conditions and then slowly added dropwise to the reactor. The reaction was stirred at room temperature for 36 hours, filtered, and the resulting solution was concentrated. 30 ml of dichloromethane was added and the mixture was washed three times with 1 eq / L hydrochloric acid solution. The organic phase was collected and evaporated to obtain double-terminated acrylamide polyethylene glycol monomer 1.

[0057] Double-terminated acrylamide polyethylene glycol monomer 2: (self-made)

[0058] The preparation method is compared with the double-terminated acrylamide polyethylene glycol monomer 1, except that 1 eq of polyethylene glycol 1 with an average molecular weight of 200 is replaced by 1 eq of polyethylene glycol 2 with an average molecular weight of 300.

[0059] Double-terminated acrylamide polyethylene glycol monomer 3:

[0060] The preparation method is compared with the double-terminated acrylamide polyethylene glycol monomer 1, except that 1 eq of polyethylene glycol 1 with an average molecular weight of 200 is replaced by 1 eq of polyethylene glycol 3 with an average molecular weight of 400.

[0061] Acrylate monomer 1:

[0062] Under a nitrogen atmosphere, 1.0 eq of 1-pentadecanol, 2.0 eq of triethylamine, and 20 eq of anhydrous toluene were added to a three-necked flask. 1.8 eq of methacryloyl chloride was dissolved in 20 eq of anhydrous toluene at 0°C and then slowly added dropwise to the reactor. The reaction was stirred at 30°C for 36 h, filtered, and the resulting solution was concentrated, dissolved in dichloromethane, and washed three times with aqueous sodium hydroxide solution. The organic phase was collected and evaporated to obtain acrylate monomer 1.

[0063] Acrylate Monomer 2:

[0064] The preparation method is similar to that of the acrylate monomer 1, except that 1.0 eq of 1-pentadecanol is replaced by 1.0 eq of 1-pentacosanol.

[0065] Acrylate Monomer 3:

[0066] The preparation method is compared with the acrylate monomer 1, except that 1.0 eq of 1-pentadecanol is replaced by 1.0 eq of 1-triacontanol.

[0067] Hyperbranched polymer 1:

[0068] In a nitrogen atmosphere, 10 eq of hydroxyethyl acrylate, 1 eq of double-terminated acrylamide polyethylene glycol monomer 1, 0.2 eq of 2-bromo-2-methyl-N-(3-(triethoxysilyl)propyl)propionamide, 0.4 eq of cuprous bromide, and 40 eq of anhydrous anisole were added to a Shrek flask. After freeze-thaw degassing, 0.6 eq of N,N,N',N",N"-pentamethyldiethylenetriamine was added. After stirring at 60°C for 30 min, 3 eq of acrylate monomer 1 was added and stirring was continued for 30 min. After completion of the reaction, oxygen was introduced to terminate the reaction. The copper ions were removed by column chromatography, and the resulting solution was concentrated and precipitated in cold methanol. The solid product was collected by filtration and dried to obtain a hyperbranched polymer 1.

[0069] Hyperbranched polymer 2:

[0070] In a nitrogen atmosphere, 15 eq of hydroxyethyl acrylate, 3 eq of double-terminated acrylamide polyethylene glycol monomer 1, 0.3 eq of 2-bromo-2-methyl-N-(3-(triethoxysilyl)propyl)propionamide, 0.6 eq of cuprous bromide, and 40 eq of anhydrous anisole were added to a Shrek flask. After freeze-thaw degassing, 0.8 eq of N,N,N',N",N"-pentamethyldiethylenetriamine was added. After stirring at 60°C for 30 min, 5 eq of acrylate monomer 1 was added and stirring was continued for 30 min. After the reaction was completed, oxygen was introduced to terminate the reaction. The copper ions were removed by column chromatography, and the resulting solution was concentrated and precipitated in cold methanol. The solid product was collected by filtration and dried to obtain hyperbranched polymer 2.

[0071] Hyperbranched polymer 3:

[0072] The preparation method is different from that of the hyperbranched polymer 2 in that 3 eq of the double-terminal acrylamide polyethylene glycol monomer 1 replaces 3 eq of the double-terminal acrylamide polyethylene glycol monomer 2.

[0073] Hyperbranched polymer 4:

[0074] The preparation method is different from that of the hyperbranched polymer 2 in that 3 eq of the double-terminal acrylamide polyethylene glycol monomer 1 replaces 3 eq of the double-terminal acrylamide polyethylene glycol monomer 3.

[0075] Hyperbranched polymer 5:

[0076] The preparation method is compared with the hyperbranched polymer 2, except that 5 eq of acrylate monomer 1 replaces 5 eq of acrylate monomer 2.

[0077] Hyperbranched polymer 6:

[0078] The preparation method is different from that of hyperbranched polymer 2, except that 5 eq of acrylate monomer 1 replaces 5 eq of acrylate monomer 3.

[0079] Hyperbranched polymer 7:

[0080] The preparation method is different from that of the hyperbranched polymer 2, except that 5 eq of the acrylate monomer 1 replaces 5 eq of hydroxyethyl acrylate.

[0081] The following are the test methods for the performance parameters involved in the present invention:

[0082] Number average molecular weight: Hyperbranched polymers 1 to 7 were measured by gel permeation chromatography-differential detection (Waters, USA);

[0083] Molecular weight distribution: Hyperbranched polymers 1 to 7 were measured by gel permeation chromatography-differential detection (Waters, USA);

[0084] H NMR spectrum: 600 MHz NMR spectrometer (Bruker, Germany)

[0085] Table 1 Characterization parameters of hyperbranched polymers

[0086]

[0087] Depend on Figure 2 As shown in Table 1, the monomer and hyperbranched polymer were successfully synthesized.

[0088] A method for preparing a fast-cooling heat-sealing adhesive comprises the following steps:

[0089] Stir polyethylene wax and antioxidant at 110°C for 10 minutes to completely melt them, add ethylene-octene elastomer, raise the temperature to 140°C and stir for 10 minutes, then add hyperbranched polymer and resin in sequence, and continue stirring at 100°C for 40 minutes to obtain a basically transparent and bubble-free mixture, put it into a mold and cool it down to obtain a heat-sealed adhesive.

[0090] Table 2 Heat-sealing adhesive formulations for Examples 1 to 8 (parts by mass)

[0091]

[0092] Table 3 Comparative Examples 1 to 3 Heat-sealing Adhesive Formula (parts by mass)

[0093]

[0094]

[0095] The following performance tests were performed on the thermal adhesives of the embodiments and comparative examples:

[0096] (1) Brittle temperature, melt viscosity, and thermal stability testing: All testing is carried out in accordance with the relevant test methods of HG / T 3698-2002 EVA hot melt adhesives.

[0097] (2) Curing time: Melt the glue and scrape it onto a laminated cardboard. Then laminate another laminated cardboard onto the cardboard. Start timing from the completion of lamination and peel off from one end until the base material is cut. This means that the glue has been cured. The recorded time is the curing time of the glue.

[0098] (3) Adhesion strength, emulsion explosive packaging film: The actual bonding of the actual emulsion explosive packaging film was carried out, with a glue application amount of 0.03 g / box and a gluing temperature of 120°C. The films were placed in a 25°C oven, a humid environment (humidity 50%), and a 0°C refrigerator. After 72 hours of heat preservation and aging, the films were taken out and the middle of the straw was quickly hooked with a tensile gauge. The coated cardboard was grasped by hand and pulled at a constant speed. When the film broke, the maximum tearing force was recorded. Comparative Example 4 used a gluing temperature of 200°C.

[0099] Table 4 Thermal adhesive performance test data

[0100]

[0101]

[0102] It can be seen from the test data in Table 4 that the heat-sealing adhesive prepared by the present invention has similar bonding performance at a gluing temperature of 120°C as that of the commercial hot melt adhesive at a gluing temperature of 200°C, and has better performance in a humid environment.

[0103] As shown in Table 4, Examples 3-4 and Comparative Example 2 demonstrate that acrylate monomer plays a significant role in improving bonding performance. The higher the acrylate monomer content, the better the bonding performance. Without the acrylate monomer, the bonding ability is significantly reduced. As shown in Examples 4-6, as the molecular weight of the polyethylene glycol in the double-terminated acrylamide polyethylene glycol monomer increases, the bonding performance decreases, but the curing time, viscosity, and brittle temperature decrease, as well as the change in bonding strength from 25°C to 0°C. The reduced viscosity allows the thermal sealant to spread more quickly across the substrate, thereby reducing the curing time. As shown in Examples 4, 7, and 8, the longer the alkyl chain in the acrylate monomer, the higher the bonding strength, due to improved compatibility and interaction with the material. As shown in Comparative Examples 1 and 3, either adding too much or not adding the thermal sealant prepared by the present invention will affect its bonding performance. In Comparative Example 1, the excessive addition of hyperbranched polymer actually worsens the thermal stability, as the branched polymer itself has a lower thermal stability than the linear polymer.

[0104] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fast cooling emulsion explosive packaging film heat sealant, characterized in that: The heat-sealing adhesive comprises, by weight, 40-45 parts of ethylene-octene elastomer, 15-20 parts of polyethylene wax, 25-30 parts of resin, 25-30 parts of hyperbranched polymer, and 1.0-1.5 parts of antioxidant. The preparation method of the hyperbranched polymer is as follows: In an inert gas atmosphere, 10-15 eq of hydroxy acrylate monomer, 1-3 eq of double-terminated acrylamide polyethylene glycol monomer, 0.2-0.3 eq of 2-bromo-2-methyl-N-(3-(triethoxysilyl)propyl)propionamide, 0.4-0.6 eq of cuprous bromide, and 40-50 eq of anhydrous anisole are added to a Shrek flask, and the mixture is freeze-thawed for degassing. 0.6-0.8 eq of N,N,N',N'',N''-pentamethyldiethylenetriamine is then added, and the mixture is stirred at 50-60° C. for 30-60 min. 3-5 eq of acrylate monomer is added and stirring is continued for 30-60 min. After the reaction is completed, oxygen is introduced to terminate the reaction, and copper ions are removed by column chromatography. The resulting solution is concentrated, precipitated in cold methanol, filtered, and the solid product is collected and dried to obtain a hyperbranched polymer. The resin is a petroleum resin with a melting point of 70-110° C. The double-ended acrylamide polyethylene glycol monomer has at least one of the following molecular structures: , Formula I; , Formula II; wherein n=5~20; The acrylate monomer has at least one of the following molecular structures: , Formula III; , formula IV; wherein m=5~29.

2. The heat seal adhesive according to claim 1, wherein: The ethylene-octene elastomer has a melting point of 65-75°C.

3. The heat seal adhesive according to claim 1, wherein: The polyethylene wax has an average molecular weight of 3000-3500 and a melting point of 100-120°C.

4. The heat seal adhesive according to claim 1, wherein: The antioxidant is one or more of antioxidant 1010, antioxidant 2246, and hindered amine light stabilizer.

5. The heat seal adhesive according to claim 1, wherein: The hydroxy acrylate monomer is at least one of hydroxyethyl acrylate and hydroxyethyl methacrylate.

6. The method for preparing the heat-sealing adhesive according to any one of claims 1 to 5, characterized in that: The following steps are involved: Stir polyethylene wax and antioxidant at 100-120°C for 8-10 minutes to completely melt them, add ethylene-octene elastomer, raise the temperature to 130-140°C and stir for 10-20 minutes, then add hyperbranched polymer and resin in sequence, and continue stirring at 90-100°C for 30-40 minutes to obtain a basically transparent and bubble-free mixture. Put it into a mold and cool it down to obtain a heat-sealed adhesive.

7. Use of the heat-sealing adhesive according to any one of claims 1 to 5 in emulsion explosive packaging film.

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