Quick-cooling emulsion explosive packaging film heat sealing adhesive and application thereof

Abstract

The invention discloses a quick-cooling emulsion explosive packaging film heat-sealing adhesive and application thereof. The heat-sealing adhesive is prepared from the following components in parts by weight: 40 to 45 parts of ethylene-octylene 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. According to the hyperbranched polymer, cohesion strength is improved through internal hydrogen bonds, external olefin and a PO film have better bonding strength, and the overall hyperbranched structure has a lower melting point and viscosity and can better wet the surface of the PO film. According to the heat sealing adhesive, the bonding strength of high-temperature heat sealing adhesive can be achieved at a relatively low sizing temperature, so that the purpose of rapid cooling is achieved in a manner of reducing the sizing temperature and under the condition of not reducing the 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 are made by using emulsifiers to evenly disperse droplets of aqueous oxidant salt solutions in an oil-phase continuous medium containing porous materials such as dispersed bubbles or hollow glass microspheres, forming an oil-in-water type latex explosive. Because of its oil-in-water form, it needs to be wrapped with a polyolefin (PO) film for transportation and use. Although the PO film itself can achieve a certain degree of bonding through heat sealing, the 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 cannot meet the requirements. Considering the special properties and production efficiency of emulsion explosives, it is often necessary to add heat-sealing glue to reduce the gluing temperature, and at the same time use a cooling device to quickly cool and 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. Among them, polyolefin hot melt adhesive has good bonding strength to PO film, but the cohesive strength of low molecular weight polyolefin hot melt adhesive itself is low, and the strength is low; although the cohesive strength of high molecular weight polyolefin hot melt adhesive is increased, the gluing temperature is too high. Patent CN215551005U provides a device that can effectively reduce the 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, with short thermal curing time, low gluing temperature and good bonding performance. 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 cause its own surface energy to be high, and the wetting effect on PO film is poor, resulting in 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 deficiencies of the prior art, the present invention provides a hyperbranched polymer-doped emulsion explosive packaging film hot melt adhesive that can be quickly cooled, wherein the hyperbranched polymer improves the cohesive strength through internal hydrogen bonds, the external olefins have better bonding strength with the PO film, and the overall hyperbranched structure has a lower melting point and viscosity and can better wet the PO film surface.

[0005] The technical scheme for achieving the purpose of the present invention is as follows: a fast-cooling emulsion explosive packaging film heat-sealing adhesive, the heat-sealing adhesive comprising 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 in parts by weight; the preparation method of the hyperbranched polymer is as follows:

[0006] In an inert gas atmosphere, 10 to 15 eq of hydroxy acrylate monomer, 1 to 3 eq of double-terminal 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 bottle, and after freeze-thaw degassing, 0.6 to 0.8 eq of N,N,N',N",N"-pentamethyldiethylenetriamine is added, and after stirring at 50 to 60° C. for 30 to 60 min, 3 to 5 eq of acrylate monomer is added and stirring is continued for 30 to 60 min. After the reaction is completed, oxygen is introduced to terminate the reaction, copper ions are removed by column chromatography, the obtained 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 of Formula I or Formula II:

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

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

[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 nitrogen atmosphere, add 1eq polyethylene glycol, 3-5eq p-toluenesulfonyl chloride, and 3-5eq triethylamine to a Shrek bottle, use dichloromethane as solvent, stir at 50-60°C for 10-12h, and wait for the reaction to be completed. Wash three times with 1eq / L hydrochloric acid solution, then wash three times with 1eq / L sodium hydroxide aqueous 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, and extracted with dichloromethane three times, and the organic phase was collected and evaporated to obtain double-terminated aminoethylene glycol;

[0018] Under 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 of Formula III or Formula IV:

[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, washed three times with an aqueous sodium hydroxide solution, and 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 the 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 the hyperbranched polymer and resin in sequence, 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.

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

[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 emulsion explosive packaging film heat-sealing adhesive, wherein the heat-sealing adhesive is mixed with a hyperbranched polymer, and the heat-sealing adhesive plays a role in fast-cooling the emulsion explosive packaging film heat-sealing adhesive by lowering the gluing temperature. The hyperbranched polymer improves the cohesive strength through internal hydrogen bonds, and there is no need to increase the molecular weight to cause an excessively high gluing temperature. 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 surface of the PO film. A small amount of siloxane groups in the structure make the hot melt adhesive hydrolyze in contact with moisture in the air as the placement time increases after heat sealing, and can react with silanol or hydroxyl to form a cross-linked structure, further enhancing the 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 acrylic acid ester 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 described embodiments 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 creative work are 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 as follows:

[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, item number SYSZ02, Jinan Shanhai Chemical Technology;

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

[0040] Amorphous polyolefin (APAO): melting point 87~100℃; 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 number 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 number 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 number C804582, purchased from Shanghai MacLean Biochemical Technology;

[0049] N,N,Nˋ,Nˋ,Nˋˋ-Pentamethyldiethylenetriamine: product number N822749, purchased from Shanghai MacLean Biochemical Technology;

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

[0051] 1-pentacosanol: product number 26188, purchased from Shandong West Asia Chemical;

[0052] 1-Triacontanol: product number T819625, purchased from Shanghai MacLean Biochemical Technology;

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

[0054] Under nitrogen atmosphere, add 1eq of polyethylene glycol 1 with an average molecular weight of 200, 3eq of p-toluenesulfonyl chloride, and 3eq of triethylamine to a Shrek bottle, use dichloromethane as solvent, stir at 50°C for 10h, and wait for the reaction to be completed. Wash three times with 1eq / L hydrochloric acid solution, then wash three times with 1eq / L sodium hydroxide aqueous 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 h. The mixture was extracted with dichloromethane three times, and the organic phase was collected and evaporated to obtain double-terminated aminoethylene glycol with an average molecular weight of 200.

[0056] Under 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 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-terminal acrylamide polyethylene glycol monomer 1, in 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-terminal acrylamide polyethylene glycol monomer 1, in 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, washed 3 times with aqueous sodium hydroxide solution, and the organic phase was collected and evaporated to obtain acrylate monomer 1.

[0063] Acrylate Monomer 2:

[0064] 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-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 anisole anhydrous were added to a Shrek bottle. 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 the reaction was completed, oxygen was introduced to terminate the reaction. Copper ions were removed by column chromatography. The resulting solution was concentrated, precipitated in cold methanol, filtered, and the solid product was collected 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 anisole anhydrous were added to a Shrek bottle. 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. Copper ions were removed by column chromatography. The resulting solution was concentrated, precipitated in cold methanol, filtered, and the solid product was collected and dried to obtain a 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 the acrylate monomer 1 replaces 5 eq of the acrylate monomer 2.

[0077] Hyperbranched polymer 6:

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

[0079] Hyperbranched polymer 7:

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

[0081] The following is the test method of the performance parameters involved in the present invention:

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

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

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

[0085] Table 1 Characterization parameters of hyperbranched polymers

[0086]

[0087] Depend on Figure 2 From the data in Table 1, it can be seen that the monomer and hyperbranched polymer were successfully synthesized.

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

[0089] The polyethylene wax and antioxidant were stirred at 110°C for 10 minutes to completely melt them, and ethylene-octene elastomer was added. The temperature was raised to 140°C and stirred for 10 minutes. Then, the hyperbranched polymer and resin were added in sequence, and stirring was continued at 100°C for 40 minutes to obtain a basically transparent and bubble-free mixture. The mixture was placed in a mold and cooled 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 formulations (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 tests: all are tested in accordance with the relevant test methods of HG / T 3698-2002 EVA hot melt adhesives.

[0097] (2) Curing time: After the glue is melted, it is scraped onto a laminated cardboard, and then another laminated cardboard is laminated onto it. The time is counted from the completion of lamination. The glue is peeled off from one end until the substrate 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 adopted, the glue application amount was 0.03 g / box, the glue application temperature was 120°C, and 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 tear force was recorded. Comparative Example 4 used a glue application 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 commercially available hot melt adhesive at a gluing temperature of 200°C, and has better performance in a humid environment.

[0103] As shown in the data of Examples 3 to 4 and Comparative Example 2 in Table 4, acrylate monomer plays an important role in improving the bonding performance. The higher the content of acrylate monomer, the better the bonding performance. When the acrylate monomer is not added, the bonding ability is greatly reduced. As shown in the data of Examples 4 to 6, as the molecular weight of polyethylene glycol in the double-terminal acrylamide polyethylene glycol monomer increases, its bonding performance decreases, but its curing time, viscosity, brittle temperature, and the change value of the bonding strength from 25°C to 0°C decrease. The viscosity decreases, which allows the thermal adhesive to spread the substrate quickly, 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, which is due to the improved compatibility and interaction with the material. As shown in the data of Comparative Examples 1 and 3, too much or no addition of the thermal adhesive prepared by the present invention will affect its bonding performance. In Comparative Example 1, adding too much hyperbranched polymer will make the thermal stability worse, which is due to the poor thermal stability of the branched polymer itself than that of the linear polymer.

[0104] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. 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 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 in parts by weight; the preparation method of the hyperbranched polymer is as follows: In an inert gas atmosphere, 10 to 15 eq of hydroxy acrylate monomer, 1 to 3 eq of double-terminal 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 anisole anhydrous are added to a Shrek bottle, and the mixture is freeze-thawed for degassing. Then, 0.6 to 0.8 eq of N,N,N',N",N"-pentamethyldiethylenetriamine is added, and the mixture is stirred at 50 to 60° C. for 30 to 60 min. 3 to 5 eq of acrylate monomer is added and the stirring is continued for 30 to 60 min. After the reaction is completed, oxygen is introduced to terminate the reaction, copper ions are removed by column chromatography, the obtained solution is concentrated, precipitated in cold methanol, filtered, and the solid product is collected and dried to obtain a hyperbranched polymer.

2. The heat sealant according to claim 1, characterized in that: The melting point of the ethylene-octene elastomer is 65-75°C.

3. The heat seal adhesive according to claim 1, characterized in that: The resin is petroleum resin with a melting point of 70-110°C.

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

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

6. The heat seal adhesive according to claim 1, characterized in that: The hydroxy acrylate monomer is at least one of hydroxyethyl acrylate and hydroxyethyl methacrylate.

7. The heat seal adhesive according to claim 1, characterized in that: The double-terminal acrylamide polyethylene glycol monomer has at least one of the following molecular structures: Wherein n=5~20.

8. The heat seal adhesive according to claim 1, characterized in that: The acrylate monomer has at least one of the following molecular structures of Formula III or Formula IV: Wherein m=5~29.

9. The method for preparing the heat-sealing adhesive according to any one of claims 1 to 8, characterized in that: The following steps are involved: Stir the 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 the hyperbranched polymer and resin in sequence, 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.

10. Use of the heat-sealing adhesive according to any one of claims 1 to 8 in emulsion explosive packaging film.

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