A low-temperature, high-elasticity hot melt adhesive film and its preparation method

Abstract

This invention relates to a low-temperature, high-elasticity hot melt adhesive film and its preparation method. The hot melt adhesive film, by weight, comprises: 30-50 parts of modified SIS elastomer, 15-25 parts of polyamide resin, 8-15 parts of polycaprolactone diol, 5-10 parts of plasticizer, 8-15 parts of tackifier, 0.5-2 parts of antioxidant, and 0.3-1 parts of heat stabilizer. The modified SIS elastomer is methyl methacrylate-grafted modified SIS with a grafting rate of 8%-15% and a number-average molecular weight of 80,000-120,000. The polyamide resin has a melting point of 70-90℃ and a number-average molecular weight of 5,000-8,000. The hot melt adhesive of this invention has a melting point controlled at 70-90℃, allowing for low-temperature ironing at 90-100℃, effectively protecting temperature-sensitive fabrics such as silk and preventing high-temperature damage. Simultaneously, with the modified SIS elastomer as the core and the cross-linking effect of polycaprolactone diol, it possesses excellent elasticity and flexibility.

Description

Technical Field

[0001] This invention relates to the field of polymer rubber product preparation technology, specifically to a low-temperature high-elasticity hot melt adhesive film and its preparation method. Background Technology

[0002] In the garment production process, hot melt adhesive lining is a key auxiliary material for improving the stiffness and shaping of garment fabrics. It is bonded to garment fabrics (such as collars, cuffs, and plackets) after being heated and melted by ironing, replacing traditional needle and thread sewing. This not only improves the shape and texture of the garments, but also simplifies the production process and increases production efficiency.

[0003] Conventional hot melt adhesive backings have a relatively high melting point (usually 120-160℃). During the ironing and bonding process, high temperatures can easily cause some temperature-sensitive fabrics to yellow, deform, or become damaged, severely affecting the quality of the garment. If a low melting point (below 100℃) is required to protect sensitive fabrics, non-elastic EVA or low-melting-point TPU are usually chosen, but they cannot provide high elasticity. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature, high-elasticity hot melt adhesive film that achieves both a low melting point and high elasticity.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A low-temperature, high-elasticity hot melt adhesive film, characterized in that, by weight, the raw material composition includes: Modified SIS elastomer 30-50 parts, polyamide resin 15-25 parts, polycaprolactone diol 8-15 parts, plasticizer 5-10 parts, tackifier 8-15 parts, antioxidant 0.5-2 parts, heat stabilizer 0.3-1 parts; The modified SIS elastomer is methyl methacrylate grafted modified SIS with a grafting rate of 8%-15% and a number-average molecular weight of 80,000-120,000; the polyamide resin has a melting point of 70-90℃ and a number-average molecular weight of 5,000-8,000.

[0006] Further, by weight, the preferred raw material composition is: 35-45 parts modified SIS elastomer, 18-22 parts polyamide resin, 10-13 parts polycaprolactone diol, 6-9 parts plasticizer, 10-13 parts tackifier, 0.8-1.5 parts antioxidant, and 0.5-0.8 parts heat stabilizer.

[0007] Furthermore, the polyamide resin is a copolymer of caprolactam, adipic acid, and sebacic acid.

[0008] Furthermore, the number-average molecular weight of the polycaprolactone diol is 2000-4000.

[0009] Furthermore, the plasticizer is dioctyl adipate; the tackifier is hydrogenated rosin resin with a softening point of 80-100℃.

[0010] Furthermore, the antioxidant is a hindered phenolic antioxidant, selected from one or a mixture of two of antioxidants 1010 and antioxidant 1076; the heat stabilizer is zinc stearate.

[0011] Further, the preparation method of the modified SIS elastomer includes: mixing and dissolving 100 parts of SIS with 300-400 parts of toluene solution, adding 10-15 parts of ethyl acetate solution containing 0.3-0.5 parts of benzoyl peroxide dropwise, stirring evenly, heating to 75-85℃, then adding methyl methacrylate solution containing 0.2-0.4 parts of benzoyl peroxide dropwise, reacting at a constant temperature for 1.5-2.5 hours under nitrogen protection, pouring the reactants into 3-5 times their volume of acetone, stirring evenly, precipitating, filtering, soaking, rinsing, and drying to obtain the final product.

[0012] This invention also discloses a method for preparing a low-temperature, high-elasticity hot melt adhesive film, which includes the following steps: S1: Pretreatment of raw materials: The modified SIS elastomer, polyamide resin, and polycaprolactone diol are dried in a drying oven at 60-70℃ for 2-3 hours; the plasticizer, tackifier, antioxidant, and heat stabilizer are mixed evenly to obtain the auxiliary mixture; S2: Melt Mixing: Add the dried modified SIS elastomer to a twin-screw extruder, set the screw speed to 120-150 r / min, and set the barrel temperature in sections as follows: Zone 1 80-90℃, Zone 2 90-100℃, Zone 3 100-110℃, Zone 4 105-115℃. After the modified SIS elastomer has completely melted, add the dried polyamide resin and polycaprolactone diol in sequence, and continue to melt mix for 15-20 minutes to obtain the basic melt. S3: Add auxiliary agents and mix: Add the prepared auxiliary mixing agent to the base melt, keep the screw speed constant, and continue to mix for 10-15 minutes. Maintain the barrel temperature at 100-110℃ to obtain hot melt adhesive melt. S4: Extrusion molding: The hot melt adhesive is extruded through the extrusion die of a twin-screw extruder at an extrusion temperature of 105-115℃. After extrusion, it is cooled and pelletized to obtain low-temperature, high-elasticity hot melt adhesive film particles. S5: Liner preparation: Hot melt adhesive particles are calendered into a film using a calender at a temperature of 90-100℃ and a thickness of 0.1-0.3mm to obtain a low-temperature, high-elasticity hot melt adhesive film for garment linings.

[0013] Furthermore, in step S4, cooling is achieved by combining air cooling and water cooling, with the cooling temperature controlled at 20-30℃.

[0014] The present invention also discloses the application of a low-temperature high-elasticity hot melt adhesive film, which is used for garment linings and is bonded to garment fabrics under ironing conditions of 90-100℃.

[0015] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: 1. The hot melt adhesive of this invention has a melting point controlled at 70-90℃, and can be ironed at a low temperature of 90-100℃, effectively protecting temperature-sensitive fabrics such as silk and avoiding high-temperature damage; at the same time, with modified SIS elastomer as the core and the cross-linking effect of polycaprolactone diol, by controlling the grafting rate and number-average molecular weight, the problem of elasticity deterioration or adhesion reduction caused by excessively high or low values ​​is avoided.

[0016] 2. The present invention designs the polyamide resin as a copolymer of caprolactam with adipic acid and sebacic acid. This type of copolymer has good melt flowability, thus meeting the requirements of low melting point and bonding strength, and has better compatibility with modified SIS elastomers and polycaprolactone diol.

[0017] 3. The present invention uses a plasticizer with good compatibility, which can reduce the hardness of the system and improve its elasticity.

[0018] 4. The antioxidant of this invention is a hindered phenol, which has excellent antioxidant effect and can prevent the hot melt adhesive from oxidizing and aging during melt processing and long-term use, thus extending the product's service life. The heat stabilizer is zinc stearate, which can improve the thermal stability of the hot melt adhesive, prevent degradation during high-temperature melt processing (such as extrusion and calendering), ensure stable product performance, and meet the processing requirements of garment linings. Detailed Implementation

[0019] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, are also considered to fall within the scope of the present invention.

[0020] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0021] The test materials used in this invention are all common commercial products and can be purchased on the market. Example

[0022] This invention discloses a low-temperature, high-elasticity hot melt adhesive film, which, by weight, comprises: 30-50 parts of modified SIS elastomer, 15-25 parts of polyamide resin, 8-15 parts of polycaprolactone diol, 5-10 parts of plasticizer, 8-15 parts of tackifier, 0.5-2 parts of antioxidant, and 0.3-1 parts of heat stabilizer.

[0023] The modified SIS elastomer is methyl methacrylate grafted modified SIS with a grafting rate of 8%-15% and a number-average molecular weight of 80,000-120,000; the polyamide resin has a melting point of 70-90℃ and a number-average molecular weight of 5,000-8,000.

[0024] The modified SIS elastomer is a methyl methacrylate (MMA) grafted modified SIS, and its preparation method includes: Take 100 parts by weight of SIS elastomer (SIS1244), add 300-400 parts of toluene solution (toluene purity ≥99.5%), place in a reactor equipped with a stirrer, nitrogen inlet device and reflux condenser, and mix and stir at 25-30℃ and 200-250 r / min for 30-40 minutes until SIS is completely dissolved to obtain SIS toluene solution; Subsequently, slowly add 10-15 parts of ethyl acetate solution (ethyl acetate purity ≥99.5%) to the above SIS toluene solution. The ethyl acetate solution contains 0.3-0.5 parts of benzoyl peroxide (BPO, purity ≥98%). The dropping rate is controlled at 1-2 drops / second. After the addition is completed, continue stirring for 10-15 minutes to ensure that the BPO is evenly dispersed. Next, slowly raise the temperature inside the reactor to 75-85℃ and maintain this temperature for 5-10 minutes. Then, slowly add 20-30 parts of methyl methacrylate (MMA, purity ≥99.5%) solution, which contains 0.2-0.4 parts of benzoyl peroxide (BPO), at a dropping rate of 1 drop / second. After the addition is complete, continuously purge nitrogen gas (nitrogen purity ≥99.9%) into the reactor at a purge rate of 50-80 mL / min. React at a constant temperature of 75-85℃ for 1.5-2.5 hours. After the reaction is complete, the reaction product is slowly poured into 3-5 times its volume of acetone (acetone purity ≥99.5%), stirred evenly to allow precipitation, and allowed to stand for 20-30 minutes. Then, it is filtered using a vacuum filtration device to obtain a solid precipitate. The solid precipitate is then soaked in acetone for 2-3 hours, stirred every 30 minutes to remove unreacted MMA monomers and BPO. Subsequently, it is rinsed repeatedly with deionized water 3-4 times until the rinsing solution is neutral (pH 6.8-7.2). Finally, the rinsed solid was placed in a vacuum drying oven at 60-70℃, with the vacuum degree controlled at -0.08 to -0.09 MPa, and dried for 4-6 hours to remove residual solvent and moisture, thus obtaining the modified SIS elastomer.

[0025] The core of this invention is to adjust the grafting rate by modifying the amounts of methyl methacrylate monomer and benzoyl peroxide. More grafted monomers result in a higher grafting rate. Introducing an appropriate amount of initiator can improve grafting efficiency, but excessive amounts can lead to uneven molecular weight distribution. The molecular weight is adjusted by modifying the reaction temperature and time (higher temperature and longer time result in higher polymerization degree and larger molecular weight), while simultaneously controlling the amount of toluene solution (appropriate solvent dosage avoids excessive crosslinking due to excessively high SIS concentration).

[0026] Modified SIS elastomers were prepared according to the above preparation method and control mode, and their grafting rate and number-average molecular weight were tested.

[0027]

[0028] Prepare samples separately: Sample 2-1: A low-temperature, high-elasticity hot melt adhesive film, with the following raw material composition by weight: 30 parts modified SIS elastomer, 15 parts polyamide resin, 8 parts polycaprolactone diol, 5 parts dioctyl adipate, 8 parts hydrogenated rosin resin, 0.5 parts antioxidant 1010, and 0.3 parts zinc stearate.

[0029] Among them, the modified SIS elastomer is sample 1-1, that is, the grafting rate is 6.2% and the number average molecular weight is 60500; the polyamide resin is a copolymer of caprolactam with adipic acid and sebacic acid, with a melting point of 80℃ and a number average molecular weight of 5000; the polycaprolactone diol has a number average molecular weight of 2000; and the hydrogenated rosin resin has a softening point of 90℃.

[0030] The preparation method is as follows: S1: Pretreatment of raw materials: The modified SIS elastomer, polyamide resin, and polycaprolactone diol are dried in a drying oven at 65°C for 2.5 hours; the plasticizer, tackifier, antioxidant, and heat stabilizer are mixed evenly to obtain the auxiliary mixture; S2: Melt Mixing: Add the dried modified SIS elastomer to a twin-screw extruder, set the screw speed to 135 r / min, and set the barrel temperature in sections as follows: Zone 1 85℃, Zone 2 95℃, Zone 3 105℃, and Zone 4 110℃. After the modified SIS elastomer has completely melted, add the dried polyamide resin and polycaprolactone diol in sequence, and continue to melt mix for 18 minutes to obtain the basic melt. S3: Add auxiliary agent and mix: Add the prepared auxiliary mixing agent to the base melt, keep the screw speed constant, continue to mix for 12 minutes, keep the barrel temperature at 105℃, and obtain hot melt adhesive melt; S4: Extrusion molding: The hot melt adhesive is extruded through the extrusion die of a twin-screw extruder at an extrusion temperature of 110°C. After extrusion, it is cooled and pelletized to obtain low-temperature, high-elasticity hot melt adhesive film particles. S5: Liner preparation: Hot melt adhesive particles are calendered into a film using a calender at a temperature of 95°C and a thickness of 0.2 mm to obtain a low-temperature, high-elasticity hot melt adhesive film for garment linings.

[0031] Sample 2-2: Only the modified SIS elastomer was selected as Sample 1-2, i.e., grafting rate of 8.1% and number average molecular weight of 80200. The remaining parameters and preparation method are the same as those of Sample 2-1.

[0032] Samples 2-3: Only the modified SIS elastomer was selected as Sample 1-4, i.e., grafting rate of 12.3% and number average molecular weight of 100,500. The remaining parameters and preparation methods were the same as those of Sample 2-1.

[0033] Samples 2-4: Only the modified SIS elastomer was selected as Sample 1-6, i.e., grafting rate of 15.2% and number average molecular weight of 128,000. The remaining parameters and preparation methods are the same as those of Sample 2-1.

[0034] Samples 2-5: Only the modified SIS elastomer was selected as Sample 1-8, i.e., grafting rate of 17.8% and number average molecular weight of 140,200. The remaining parameters and preparation methods are the same as those of Sample 2-1.

[0035] Sample 2-6: The melting point of the polyamide resin was selected as 80℃, and the other parameters and preparation methods were the same as those of Sample 2-3.

[0036] Sample 2-7: The melting point of the polyamide resin was selected as 90℃, and the other parameters and preparation methods were the same as those of Sample 2-3.

[0037] Sample 2-8: The molecular weight of the polyamide resin was selected as 4000, and the other parameters and preparation methods were the same as those of Sample 2-6.

[0038] Sample 2-9: The molecular weight of the polyamide resin was selected as 6000, and the other parameters and preparation methods were the same as those of Sample 2-6.

[0039] Sample 2-10: The molecular weight of the polyamide resin was selected as 8000, and the other parameters and preparation method were the same as those of Sample 2-6.

[0040] Sample 2-11: The molecular weight of the polyamide resin was selected as 10,000, and the other parameters and preparation method were the same as those of Sample 2-6.

[0041] Sample 2-12: 35 parts modified SIS elastomer, 18 parts polyamide resin, 10 parts polycaprolactone diol, 6 parts dioctyl adipate, 10 parts hydrogenated rosin resin, 0.8 parts antioxidant 1010, and 0.5 parts zinc stearate. The remaining parameters and preparation method are the same as those of Sample 2-9.

[0042] Sample 2-13: 40 parts modified SIS elastomer, 20 parts polyamide resin, 12 parts polycaprolactone diol, 8 parts dioctyl adipate, 12 parts hydrogenated rosin resin, 1.2 parts antioxidant 1010, and 0.7 parts zinc stearate. The remaining parameters and preparation method are the same as those for Sample 2-9.

[0043] Sample 2-14: 45 parts modified SIS elastomer, 22 parts polyamide resin, 13 parts polycaprolactone diol, 9 parts dioctyl adipate, 13 parts hydrogenated rosin resin, 1.5 parts antioxidant 1010, and 0.7 parts zinc stearate. The remaining parameters and preparation method are the same as those for Sample 2-9.

[0044] Sample 2-15: The number average molecular weight of polycaprolactone diol is 3000, and the other parameters and preparation method are the same as those of sample 2-13.

[0045] Sample 2-16: The number average molecular weight of polycaprolactone diol is 4000, and the other parameters and preparation method are the same as those of sample 2-13.

[0046] Sample 2-17: The number average molecular weight of polycaprolactone diol is 5000, and the other parameters and preparation method are the same as those of sample 2-13.

[0047] Sample 2-18: The plasticizer dioctyl adipate was replaced with dibutyl phthalate, and the remaining parameters and preparation method were the same as those of Sample 2-15.

[0048] Sample 2-19: The tackifier hydrogenated rosin resin was replaced with terpene resin, with a softening point of 80℃. All other parameters and preparation methods were the same as those of Sample 2-15.

[0049] The performance of samples 2-1 to 2-19 was tested, and the test results are as follows:

[0050] From samples 2-1 to 2-5, it can be seen that sample 2-3 has the best performance. Sample 2-1 has a grafting rate of 6.2%, Mn60500, and a Shore hardness of 54, which is relatively hard; its elongation at break is 210%, which is poor; its 180° peel strength is 1.3 N / mm, indicating poor adhesion; its wash retention rate is 71%, indicating good compatibility, but its elasticity and adhesion are significantly deteriorated, failing to meet the elasticity requirements for bonding silk fabrics. Sample 2-5 has a grafting rate of 17.8%, Mn140200, and a Shore hardness of 53, which is relatively hard; its elongation at break is 220%, indicating poor elasticity; it shows slight delamination, decreased compatibility, and worsened adhesion. Therefore, an excessively high grafting rate can lead to excessive cross-linking of molecular chains and performance degradation.

[0051] Based on samples 2-6 to 2-11, sample 2-9 exhibits superior performance. However, in sample 2-8, the polyamide resin Mn4000 is too low, resulting in an elongation at break of 380% and decreased elasticity; the 180° peel strength is only 1.5 N / mm, indicating poor adhesion and slight delamination. This demonstrates that the low molecular weight leads to insufficient intermolecular forces and degraded performance. In sample 2-11, the polyamide resin Mn10000 has a Shore hardness of 45, which is too hard; the elongation at break is 320%, indicating poor elasticity; the melt viscosity is high, resulting in decreased processability; and slight delamination demonstrates that the high molecular weight leads to poor melt flowability and decreased elasticity and compatibility.

[0052] Based on samples 2-12 to 2-17, sample 2-13 exhibits superior performance. Sample 2-17, however, has a polycaprolactone diol number-average molecular weight (Mn) of 5000 and a Shore hardness of 46, indicating it is relatively hard; its elongation at break is 310%, indicating poor elasticity; it shows slight delamination and decreased adhesion, demonstrating that excessively high molecular weight affects compatibility with other raw materials and reduces cross-linking effectiveness.

[0053] Based on samples 2-15 to 2-19, it is evident that dioctyl adipate as the plasticizer and hydrogenated rosin resin as the tackifier exhibit the best overall performance, with an elongation at break of 435%, a 180° peel strength of 2.6 N / mm, a wash retention rate of 93%, uniform compatibility without delamination, compliance with environmental standards, and the most comfortable wear. In sample 2-18, replacing the plasticizer with dibutyl phthalate resulted in localized delamination and decreased compatibility; increased melt viscosity and poor processability; slightly decreased adhesion and elasticity; and a slight foreign body sensation when worn, proving that dioctyl adipate is more suitable. In sample 2-19, replacing the tackifier with terpene resin reduced the 180° peel strength to 1.5 N / mm, indicating poor adhesion; while the wash retention rate was 76%, although compatibility was good, the adhesion was weak, affecting wearing stability, demonstrating that hydrogenated rosin resin has superior adhesive properties.

[0054] Based on samples 2-12 to 2-14, sample 2-13, containing 40 parts modified SIS and 20 parts polyamide, exhibits the best overall performance with a Shore hardness of 37 (the softest), an elongation at break of 430%, a 180° peel strength of 2.5 N / mm, and a 92% water wash retention rate. This demonstrates that this formulation achieves synergistic effects among the raw materials, reaching peak performance. Sample 2-12, with slightly lower weight proportions of each raw material, shows a slight decrease in performance, with a 180° peel strength of 2.1 N / mm and a slight reduction in elasticity and adhesion, indicating that insufficient raw material content cannot form a sufficient elastic network and bonding sites. In sample 2-14, slightly higher weight proportions of each raw material do not significantly improve performance; instead, they lead to increased melt viscosity, decreased processability, and increased costs.

[0055] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A low-temperature, high-elasticity hot melt adhesive film, characterized in that, By weight, the raw material composition includes: Modified SIS elastomer 30-50 parts, polyamide resin 15-25 parts, polycaprolactone diol 8-15 parts, plasticizer 5-10 parts, tackifier 8-15 parts, antioxidant 0.5-2 parts, heat stabilizer 0.3-1 parts; The modified SIS elastomer is methyl methacrylate grafted modified SIS with a grafting rate of 8%-15% and a number-average molecular weight of 80,000-120,000; the polyamide resin has a melting point of 70-90℃ and a number-average molecular weight of 5,000-8,000.

2. The low-temperature high-elasticity hot melt adhesive film according to claim 1, characterized in that, The preferred raw material composition by weight is: 35-45 parts modified SIS elastomer, 18-22 parts polyamide resin, 10-13 parts polycaprolactone diol, 6-9 parts plasticizer, 10-13 parts tackifier, 0.8-1.5 parts antioxidant, and 0.5-0.8 parts heat stabilizer.

3. The low-temperature high-elasticity hot melt adhesive film according to claim 1 or 2, characterized in that, The polyamide resin is a copolymer of caprolactam, adipic acid, and sebacic acid.

4. The low-temperature high-elasticity hot melt adhesive film according to claim 1 or 2, characterized in that, The number average molecular weight of the polycaprolactone diol is 2000-4000.

5. The low-temperature high-elasticity hot melt adhesive film according to claim 1 or 2, characterized in that, The plasticizer is dioctyl adipate; the tackifier is hydrogenated rosin resin with a softening point of 80-100℃.

6. The low-temperature high-elasticity hot melt adhesive film according to claim 1 or 2, characterized in that, The antioxidant is a hindered phenolic antioxidant, selected from one or a mixture of two of antioxidants 1010 and antioxidant 1076; the heat stabilizer is zinc stearate.

7. The low-temperature high-elasticity hot melt adhesive film according to claim 1 or 2, characterized in that, The preparation method of the modified SIS elastomer includes: mixing and dissolving 100 parts of SIS with 300-400 parts of toluene solution, adding 10-15 parts of ethyl acetate solution containing 0.3-0.5 parts of benzoyl peroxide dropwise, stirring evenly, heating to 75-85℃, then adding methyl methacrylate solution containing 0.2-0.4 parts of benzoyl peroxide dropwise, reacting at a constant temperature for 1.5-2.5 hours under nitrogen protection, pouring the reactants into 3-5 times the volume of acetone, stirring evenly, precipitating, filtering, soaking, rinsing, and drying to obtain the final product.

8. A method for preparing a low-temperature, high-elasticity hot melt adhesive film as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Pretreatment of raw materials: The modified SIS elastomer, polyamide resin, and polycaprolactone diol are dried in a drying oven at 60-70℃ for 2-3 hours; the plasticizer, tackifier, antioxidant, and heat stabilizer are mixed evenly to obtain the auxiliary mixture; S2: Melt Mixing: Add the dried modified SIS elastomer to a twin-screw extruder, set the screw speed to 120-150 r / min, and set the barrel temperature in sections as follows: Zone 1 80-90℃, Zone 2 90-100℃, Zone 3 100-110℃, Zone 4 105-115℃. After the modified SIS elastomer has completely melted, add the dried polyamide resin and polycaprolactone diol in sequence, and continue to melt mix for 15-20 minutes to obtain the basic melt. S3: Add auxiliary agents and mix: Add the prepared auxiliary mixing agent to the base melt, keep the screw speed constant, and continue to mix for 10-15 minutes. Maintain the barrel temperature at 100-110℃ to obtain hot melt adhesive melt. S4: Extrusion molding: The hot melt adhesive is extruded through the extrusion die of a twin-screw extruder at an extrusion temperature of 105-115℃. After extrusion, it is cooled and pelletized to obtain low-temperature, high-elasticity hot melt adhesive film particles. S5: Liner preparation: Hot melt adhesive particles are calendered into a film using a calender at a temperature of 90-100℃ and a thickness of 0.1-0.3mm to obtain a low-temperature, high-elasticity hot melt adhesive film for garment linings.

9. The preparation method according to claim 7, characterized in that, In step S4, cooling is achieved by combining air cooling and water cooling, with the cooling temperature controlled at 20-30℃.

10. An application of a low-temperature, high-elasticity hot melt adhesive film as described in any one of claims 1-7, characterized in that, The low-temperature, high-elasticity hot melt adhesive film is used for garment linings and is bonded to the garment fabric under ironing conditions of 90-100℃.

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