A high-resilience hot melt adhesive, its preparation method and application

Abstract

This invention discloses a high-resilience hot melt adhesive, its preparation method, and its applications. The high-resilience hot melt adhesive comprises the following components by weight: 5-25 parts of high molecular weight polymer SEBS, 5-25 parts of low molecular weight polymer SEBS, 15-45 parts of liquid petroleum resin, 10-40 parts of plasticizer, 5-30 parts of tackifying resin, 0.1-2 parts of antioxidant, and 1-10 parts of polyα-methylstyrene resin. The high molecular weight polymer SEBS has a molecular weight higher than 200,000, and the low molecular weight polymer SEBS has a molecular weight less than 100,000. The high-resilience hot melt adhesive prepared by this invention has excellent elasticity, heat resistance, and softness, and can be used to prepare elastic composites, making it better suited for disposable hygiene products such as sensitive menstrual pants and high-end baby diapers.

Description

Technical Field

[0001] This invention relates to the field of composite fabric production technology, and in particular to a high-resilience hot melt adhesive, its preparation method, and its application. Background Art

[0002] Nonwoven fabric is a type of fabric formed without spinning or weaving; it is created by arranging short or long textile fibers in a directional or random manner to form a web structure. Currently, meltblown fabric production commonly employs this method. Meltblown fabric production is a type of polymer extrusion web forming. Its process involves passing extruded polymer melt through a high-speed hot air stream to form extremely fine short fibers, which are then agglomerated onto porous rollers or screens. The fibers are then bonded together through self-adhesion or thermal bonding to form the nonwoven fabric. This method is currently widely used in the manufacture of nonwoven fabrics made from thermoplastic resins such as polypropylene and polyester. However, the poor elasticity and stiff feel of polypropylene and polyester nonwoven fabrics limit their application in the textile industry.

[0003] Conventional elastic composite fabrics consist of five layers: nonwoven fabric, hot melt adhesive, elastic material (spandex), hot melt adhesive, and nonwoven fabric. However, using spandex as the elastic material has drawbacks such as poor moisture absorption, easy deformation, and static electricity generation. Existing technology (Chinese Patent ZL201910527946.6, "An Elastic Hot Melt Pressure Sensitive Adhesive and Its Preparation Method and Application") replaces the spandex elastic material with an elastic hot melt pressure sensitive adhesive that has good elastic recovery rate. It also changes the structure of the traditional elastic composite fabric, simplifying it to a three-layer elastic composite fabric consisting of nonwoven fabric, hot melt adhesive, and nonwoven fabric. However, the performance of this hot melt adhesive still cannot meet the higher demands of applications, such as high resilience, heat resistance, and softness, making it better suited for disposable hygiene products such as sensitive menstrual pants and high-end baby diapers. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, one of the objectives of this invention is to provide a high-resilience hot melt adhesive. The high-resilience hot melt adhesive prepared by this invention possesses excellent elasticity, heat resistance, and softness, and can be used to prepare elastic composites, making it better suited for use in disposable hygiene products such as sensitive menstrual underwear and high-end baby diapers.

[0005] The second objective of this invention is to provide a method for preparing a high-resilience hot melt adhesive.

[0006] The third objective of this invention is to provide an elastic composite fabric.

[0007] The fourth objective of this invention is to provide a method for preparing an elastic composite fabric.

[0008] One of the objectives of this invention is achieved by the following technical solution: a high-resilience hot melt adhesive, comprising the following components in parts by weight: 5-25 parts of high molecular weight polymer SEBS, 5-25 parts of low molecular weight polymer SEBS, 15-45 parts of liquid petroleum resin, 10-40 parts of plasticizer, 5-30 parts of tackifying resin, 0.1-2 parts of antioxidant, and 1-10 parts of polyα-methylstyrene resin;

[0009] The high molecular weight polymer SEBS has a molecular weight greater than 200,000, and the low molecular weight polymer SEBS has a molecular weight less than 100,000.

[0010] Furthermore, the high molecular weight polymer SEBS is preferably one of the following: SEBS with grade A1537 provided by Kraton Pharmaceuticals, Inc. (USA), SEBS with grade 9550 provided by Lee Chang Yung Rubber Co., Ltd. (Taiwan), and SEBS with grade YH-503 provided by Yuehua Chemical Co., Ltd. (China).

[0011] Furthermore, the low molecular weight polymer SEBS is preferably one of the following: SEBS with grade G1726 provided by Kraton Pharmaceuticals, Inc. (USA), SEBS with grade 9551 provided by Lee Chang Yung Rubber Co., Ltd. (Taiwan), and SEBS with grade YH-501 provided by Yuehua Chemical Co., Ltd. (China).

[0012] Furthermore, the liquid petroleum resin is selected from either Eastman Chemical Company's liquid petroleum resin with brand name C8010 or Shenzhen Yingqun Chemical Co., Ltd.'s liquid petroleum resin with brand name Wingtack 10.

[0013] Furthermore, the plasticizer is selected from one of paraffinic oil, naphthenic oil, and aromatic oil.

[0014] Furthermore, the tackifying resin is selected from one of hydrogenated terpene resin, hydrogenated DCPD resin, hydrogenated C5 / C9 copolymer resin, hydrogenated C5 petroleum resin, and hydrogenated C9 petroleum resin.

[0015] Furthermore, the antioxidant is selected from one of the antioxidants of Foshan Yuansheng Chemical Co., Ltd. of China, namely, antioxidant No. 1010 and antioxidant No. 168.

[0016] The second objective of this invention is achieved by the following technical solution: a method for preparing a high-resilience hot melt adhesive as described above, comprising the following steps:

[0017] S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heater, start the agitator, and add the formulated amounts of plasticizer, poly-α-methylstyrene resin, tackifying resin and antioxidant;

[0018] S2: Raise the temperature of the reactor in S1 to 160-180℃, add the formulated amounts of high molecular weight polymer and low molecular weight polymer, and stir until the polymer melts.

[0019] S3: Evenly add the formulated amount of liquid petroleum resin to the reaction vessel of S2, and mix thoroughly after all the liquid petroleum resin has melted.

[0020] S4: After the reaction in S3 is completed, filter the molten material in the reactor;

[0021] S5: The molten material filtered in S4 is passed through the cooling system and the drying system in sequence, and finally packaged.

[0022] The third objective of this invention is achieved by the following technical solution: an elastic composite fabric, comprising a first layer of low basis weight nonwoven fabric, a high elastic adhesive layer, and a second layer of low basis weight nonwoven fabric arranged from bottom to top, wherein the basis weight of the first layer of low basis weight nonwoven fabric and the second layer of low basis weight nonwoven fabric does not exceed 15 gsm, and the high elastic adhesive layer is composed of the high resilience hot melt adhesive as described above.

[0023] The fourth objective of this invention is achieved by the following technical solution: a method for preparing an elastic composite fabric, comprising the following steps:

[0024] S1: Set the sprayer temperature and adhesive application rate. Spray the high-resilience hot melt adhesive as described above onto the surface of the low-grammage nonwoven fabric according to the set area. The spraying temperature is 190℃, and the adhesive application rate is set to 20-30g / m². 2 ;

[0025] S2: When the first layer of low-grammage nonwoven fabric is sprayed with elastic hot melt adhesive through a spraying machine, it is thermally bonded with the second layer of low-grammage nonwoven fabric to produce a non-elastic composite fabric.

[0026] S3: The non-elastic composite fabric is fed to the stretching roller for more than twice the stretch. The fibers of the upper and lower low-grammage nonwoven fabrics are broken by the gears to obtain the elastic composite fabric.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] The hot melt adhesive made using this invention has the characteristics of high viscosity, strong cohesion, good elasticity, good heat resistance, and good softness. The composite fabric made using this invention can be used in the field of disposable hygiene products such as sensitive menstrual pants and high-end baby diapers. Detailed Implementation

[0029] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the art. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art.

[0031] A high-resilience hot melt adhesive comprises the following components in parts by weight: 5-25 parts of high molecular weight polymer SEBS, 5-25 parts of low molecular weight polymer SEBS, 15-45 parts of liquid petroleum resin, 10-40 parts of plasticizer, 5-30 parts of tackifying resin, 0.1-2 parts of antioxidant, and 1-10 parts of polyα-methylstyrene resin.

[0032] The high molecular weight polymer SEBS has a molecular weight greater than 200,000, and the low molecular weight polymer SEBS has a molecular weight less than 100,000.

[0033] As a further embodiment, the high molecular weight polymer SEBS is preferably one of the following: SEBS with grade A1537 provided by Kraton Pharmaceuticals, Inc. (USA), SEBS with grade 9550 provided by Lee Chang Yung Rubber Co., Ltd. (Taiwan), and SEBS with grade YH-503 provided by Yuehua Chemical Co., Ltd. (China).

[0034] As a further embodiment, the low molecular weight polymer SEBS is preferably one of the following: SEBS with grade G1726 provided by Kraton Pharmaceuticals, Inc. (USA), SEBS with grade 9551 provided by Lee Chang Yung Rubber Co., Ltd. (Taiwan), and SEBS with grade YH-501 provided by Yuehua Chemical Co., Ltd. (China).

[0035] As a further embodiment, the liquid petroleum resin is selected from either Eastman Chemical Company's liquid petroleum resin with brand name C8010 or Shenzhen Yingqun Chemical Co., Ltd.'s liquid petroleum resin with brand name Wingtack 10.

[0036] As a further embodiment, the plasticizer is selected from paraffinic oil, naphthenic oil, and aromatic oil. As a more preferred embodiment, paraffinic oil is preferred as it has better compatibility with the high molecular weight polymer SEBS.

[0037] As a further embodiment, the tackifying resin is selected from one of hydrogenated terpene resin, hydrogenated DCPD resin, hydrogenated C5 / C9 copolymer resin, hydrogenated C5 petroleum resin, and hydrogenated C9 petroleum resin. More preferably, using hydrogenated DCPD petroleum resin and hydrogenated C5 petroleum resin can better enhance the peel strength of the hot melt adhesive.

[0038] As a further embodiment, the antioxidant is selected from one of the antioxidants of Foshan Yuansheng Chemical Co., Ltd. of China, namely, antioxidant No. 1010 and antioxidant No. 168.

[0039] The formulation principle of the high-resilience hot melt adhesive of the present invention is as follows:

[0040] In this invention, the formulation selects high polymers to meet the practical requirements of high resilience applications. The addition of high molecular weight SEBS polymer provides a better elastic base for the hot melt adhesive. This SEBS polymer has a high styrene content, resulting in high tensile strength and excellent resilience. Furthermore, this SEBS polymer has a low melt index and high viscosity. Because the hot melt adhesive made from this SEBS polymer has low surface tack, a portion of low molecular weight SEBS polymer is added to improve the overall initial tack performance of the hot melt adhesive. The low molecular weight SEBS polymer used has a high diblock content, which imparts strong initial tack performance and good wettability to the substrate. The addition of liquid petroleum resin in this invention's formulation lowers the glass transition temperature of the hot melt adhesive system. The addition of the selected plasticizer improves compatibility with the high molecular weight SEBS polymer. The addition of poly-α-methylstyrene resin improves the high-temperature resistance of the hot melt adhesive. The antioxidant in this invention's formulation prevents polymer oxidation, which leads to macromolecular chain breakage, cross-linking, and performance degradation.

[0041] The present invention also provides a method for preparing the high resilience hot melt adhesive as described above, comprising the following steps:

[0042] S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heater, start the agitator, and add the formulated amounts of plasticizer, poly-α-methylstyrene resin, tackifying resin and antioxidant;

[0043] S2: Raise the temperature of the reactor in S1 to 160-180℃, add the formulated amounts of high molecular weight polymer and low molecular weight polymer, and stir until the polymer melts.

[0044] S3: Evenly add the formulated amount of liquid petroleum resin to the reaction vessel of S2, and mix thoroughly after all the liquid petroleum resin has melted.

[0045] S4: After the reaction in S3 is completed, filter the molten material in the reactor;

[0046] S5: The molten material filtered in S4 is passed through the cooling system and the drying system in sequence, and finally packaged.

[0047] This invention also provides an elastic composite fabric, comprising, from bottom to top, a first low-basis-weight nonwoven fabric, a high-elasticity adhesive layer, and a second low-basis-weight nonwoven fabric. The basis weight of the first and second low-basis-weight nonwoven fabrics does not exceed 15 gsm. The low-basis-weight substrate is chosen to prevent fiber breakage during stretching after the elastic composite fabric is manufactured. The high-elasticity adhesive layer is composed of a high-resilience hot melt adhesive as described above. The elastic composite fabric of this invention uses three layers: low-basis-weight nonwoven fabric, elastic adhesive, and low-basis-weight nonwoven fabric. The first nonwoven fabric layer can be spunbond nonwoven fabric or spunlace nonwoven fabric, and its basis weight does not exceed 15 gsm. The third nonwoven fabric layer uses the same material as the first nonwoven fabric layer. The second layer is an elastic adhesive. The hot melt adhesive used in this invention is composed of high molecular weight polymer SEBS, low molecular weight polymer SEBS, liquid petroleum resin, plasticizer, tackifying resin, poly-α-methylstyrene resin, and antioxidant. The hot melt adhesive made using this invention has the characteristics of high viscosity, strong cohesion, and good elasticity. The composite fabric made by this invention can be used in the field of disposable hygiene products such as sensitive menstrual pants and baby diapers.

[0048] The present invention also provides a method for preparing the elastic composite fabric as described above, comprising the following steps:

[0049] S1: Set the sprayer temperature and adhesive application rate. Spray the high-resilience hot melt adhesive as described above onto the surface of the low-grammage nonwoven fabric according to the set area. The spraying temperature is 190℃, and the adhesive application rate is set to 20-30g / m². 2 The amount of adhesive applied in this invention is 20-30 gsm, which is less than that of the existing product (ZL201910527946.6 - an elastic hot melt pressure-sensitive adhesive). This is because the high-resilience hot melt adhesive has achieved cost savings and reduced costs. On the other hand, excessive adhesive application will affect the softness of the elastic nonwoven fabric.

[0050] S2: When the first layer of low-grammage nonwoven fabric is sprayed with elastic hot melt adhesive through a spraying machine, it is thermally bonded with the second layer of low-grammage nonwoven fabric to produce a non-elastic composite fabric.

[0051] S3: The non-elastic composite fabric is fed to the stretching roller for more than twice the stretch. The fibers of the upper and lower low-grammage nonwoven fabrics are broken by the gears to obtain the elastic composite fabric.

[0052] The following are specific embodiments of the present invention. Unless otherwise specified, the raw materials, equipment and other materials used in the following embodiments can be obtained by purchasing.

[0053] Examples 1-3 and Comparative Examples 1-10

[0054] Weigh the raw materials according to the proportions in Table 1, and prepare the hot melt adhesive according to the hot melt adhesive preparation method in Table 1. This yields hot melt adhesives for different examples, as detailed in Table 1. Then, continue to prepare the elastic composite fabric according to the composite fabric preparation method in Table 1, yielding elastic composite fabrics for different examples.

[0055] Table 1. Raw material ratios for Examples 1-3 and Comparative Examples 1-9

[0056]

[0057]

[0058] Unless otherwise specified, the high molecular weight polymer SEBS in Table 1 is preferably SEBS of grade A1537 provided by Kraton Pharmaceuticals, USA; the low molecular weight polymer SEBS is preferably SEBS of grade G1726 provided by Kraton Pharmaceuticals, USA; the liquid petroleum resin is selected from liquid petroleum resin of grade C8010 from Eastman Chemical Company; the plasticizer is selected from paraffin-based oil; the tackifying resin is selected from hydrogenated terpene resin; the antioxidant is selected from antioxidant of grade 1010 from Foshan Yuansheng Chemical Co., Ltd., China; and the poly-α-methylstyrene resin is purchased from poly-α-methylstyrene resin of grade 5140 from Eastman Chemical Company, USA.

[0059] Comparative Example 1

[0060] The difference between Comparative Example 1 and Example 2 is that the high molecular weight polymer SEBS is not added, while the other components, dosages, and process parameters are the same as in Example 2.

[0061] Comparative Example 2

[0062] The difference between Comparative Example 2 and Example 2 is that the low molecular weight polymer SEBS is not added, while the other components, dosages, and process parameters are the same as in Example 2.

[0063] Comparative Example 3

[0064] The difference between Comparative Example 3 and Example 2 is that no liquid petroleum resin was added, while the remaining components, dosages, and process parameters were the same as in Example 2.

[0065] Comparative Example 4

[0066] The difference between Comparative Example 4 and Example 2 is that no plasticizer was added, while the remaining components, dosages, and process parameters were the same as in Example 2.

[0067] Comparative Example 5

[0068] The difference between Comparative Example 5 and Example 2 is that no tackifying resin was added, while the remaining components, dosages, and process parameters were the same as in Example 2.

[0069] Comparative Example 6

[0070] The difference between Comparative Example 6 and Example 2 is that poly-α-methylstyrene resin was not added, while the remaining components, dosages, and process parameters were the same as in Example 2.

[0071] Comparative Example 7

[0072] The difference between Comparative Example 7 and Example 2 is that SIS is used instead of SEBS. The SIS is purchased from Shandong Jusheng Company and is grade 1170. The other components, dosages, and process parameters are the same as in Example 2.

[0073] Comparative Example 8

[0074] The difference between Comparative Example 8 and Example 2 is that SBS is used instead of SEBS. The SBS is purchased from Lee Chang Yung Co., Ltd. in Taiwan, China, with the grade being 3546. The other components, dosages, and process parameters are the same as in Example 2.

[0075] Comparative Example 9

[0076] The difference between Comparative Example 9 and Example 2 is that the conventional heat-resistant component polyimide resin is used instead of polyα-methylstyrene resin, while the remaining components, dosages, and process parameters are the same as in Example 2.

[0077] Comparative Example 10 (Existing product: Patent application number ZL202111613371.3, Enveloping elastic nonwoven fabric)

[0078] Comparative Example 10 is an existing patented product, an envelope-type elastic nonwoven fabric, comprising a first filament fiber layer at the bottom, a spandex fiber layer in the middle, and a second filament fiber layer at the top. Specifically, it is prepared using the method of Example 1 in the specification of patent application number ZL202111613371.3.

[0079] The hot melt adhesive preparation methods of Examples 1-3 and Comparative Examples 1-9 include the following steps:

[0080] S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heater, start the agitator, and add the formulated amounts of plasticizer, poly-α-methylstyrene resin, tackifying resin and antioxidant;

[0081] S2: Raise the temperature of the reactor in S1 to 160-180℃, add the formulated amounts of high molecular weight polymer and low molecular weight polymer, and stir until the polymer melts.

[0082] S3: Evenly add the formulated amount of liquid petroleum resin to the reaction vessel of S2, and mix thoroughly after all the liquid petroleum resin has melted.

[0083] S4: After the reaction in S3 is completed, filter the molten material in the reactor;

[0084] S5: The molten material filtered in S4 is passed through the cooling system and the drying system in sequence, and finally packaged.

[0085] The composite fabrics of Examples 1-3 and Comparative Examples 1-9 include a first low-basis-weight nonwoven fabric layer, a hot melt adhesive layer, and a second low-basis-weight nonwoven fabric layer arranged from bottom to top. The basis weight of the first low-basis-weight nonwoven fabric layer and the second low-basis-weight nonwoven fabric layer does not exceed 15 gsm. The hot melt adhesive layer is formed by spraying the hot melt adhesive obtained in the examples as described above.

[0086] The present invention also provides a method for preparing the elastic composite fabric as described above, comprising the following steps:

[0087] S1: Set the sprayer temperature and adhesive application rate. Spray the high-resilience hot melt adhesive as described above onto the surface of the low-grammage nonwoven fabric according to the set area. The spraying temperature is 190℃, and the adhesive application rate is set to 20-30g / m². 2 ;

[0088] S2: When the first layer of low-basis-weight nonwoven fabric is sprayed with hot melt adhesive obtained in each example through a spraying machine, it is thermally laminated with the second layer of low-basis-weight nonwoven fabric to produce a non-elastic composite fabric.

[0089] S3: The non-elastic composite fabric is fed to the stretching roller for more than twice the stretch. The fibers of the upper and lower low-grammage nonwoven fabrics are broken by the gears to obtain the elastic composite fabric.

[0090] Effect evaluation and performance testing

[0091] 1. The viscosity and softening point properties of the hot melt adhesives prepared in Examples 1-3 and Comparative Examples 1-10 were tested, and the shrinkage rate of the composite fabrics prepared in Examples 1-3 and Comparative Examples 1-10 was tested. The test items and results are shown in Table 2.

[0092] (1) Viscosity testing method

[0093] Viscosity was determined according to GB / T 2794 using a DV2TRVT viscometer and a No. 27 rotor from Bollefeld, USA. Results were recorded in centipoises (cps).

[0094] (2) Softening point test method

[0095] The softening point was tested according to GB / T 15332 using the SD-0606T automatic softening point tester from the Shanghai Institute of Geosciences Instrumentation. Results were recorded in degrees Celsius (°C).

[0096] (3) Retraction Rate Test Method

[0097] The prepared composite fabric is stretched from 85mm to 170mm, both ends are fixed, and it is placed in... 40℃ After being placed in a constant temperature oven for 1 hour, one end was removed, and the length L of the composite fabric after testing was measured. The shrinkage rate (%) was calculated as L / 85*100. The shrinkage rate of the composite fabric was measured in a 40℃ constant temperature oven, mainly to simulate the human body temperature of 37℃. This reflects both the heat resistance and resilience of the elastic adhesive.

[0098] Table 2 shows the performance test data of the hot melt adhesives and composite fabrics obtained in each example.

[0099]

[0100] Note: A 100% recovery rate indicates optimal resilience, while a 200% recovery rate indicates no recovery.

[0101] As shown in the table above, the elastic hot melt adhesive obtained by this invention has excellent resilience, heat resistance and softness, and is suitable for making elastic composite fabrics for use in the elastic waistband of disposable absorbent products such as sensitive menstrual pants, high-end baby diapers, and pull-up pants, giving each part of the waistband excellent properties.

[0102] Compared with Example 2, Comparative Example 1 differs in that it does not contain the high molecular weight polymer SEBS, and the resulting hot melt adhesive has a low softening point, low viscosity, and high shrinkage rate.

[0103] Compared with Example 2, Comparative Example 2 differs in that the low molecular weight polymer SEBS is not added, which affects the shrinkage performance of the hot melt adhesive.

[0104] Compared with Example 2, Comparative Example 3 differs in that no liquid petroleum resin is added, and the resulting hot melt adhesive affects the shrinkage performance.

[0105] Compared with Example 2, Comparative Example 4 differs in that no plasticizer is added, and the resulting hot melt adhesive affects the shrinkage performance.

[0106] Compared with Example 2, Comparative Example 5 differs in that no tackifying resin is added, and the resulting hot melt adhesive affects the shrinkage performance.

[0107] Compared with Example 2, Comparative Example 6 differs in that: no poly-α-methylstyrene resin is added, and the resulting hot melt adhesive affects the shrinkage performance.

[0108] Compared with Example 2, the difference in Comparative Examples 7-8 is that the commonly used polymers SIS and SBS are used instead of the polymer SEBS of the present invention. The hot melt adhesives prepared by these polymers do not shrink at all. It can be seen that the elastic adhesive of the present invention has better resilience.

[0109] Compared with Example 2, Comparative Example 9 differs in that: conventional heat-resistant polyimide resin is used instead of polyα-methylstyrene resin, as conventional heat-resistant polyimide resin is incompatible with the hot melt adhesive system of this application.

[0110] Comparative Example 10 is an existing patented product, an enveloping elastic nonwoven fabric. The high-elasticity hot melt adhesive obtained by this invention is applied to the composite fabric, making the composite fabric softer and more suitable for use by infants with delicate skin. This expands the application scenarios of the composite fabric, which can be applied to the elastic waistband of disposable absorbent products such as high-end diapers and pull-up pants, giving each part of the waistband excellent tensile properties.

[0111] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A high-resilience hot melt adhesive, characterized in that, It includes the following components by weight: 5-25 parts of high molecular weight polymer SEBS, 5-25 parts of low molecular weight polymer SEBS, 15-45 parts of liquid petroleum resin, 10-40 parts of plasticizer, 5-30 parts of tackifying resin, 0.1-2 parts of antioxidant, and 1-10 parts of polyα-methylstyrene resin. The high molecular weight polymer SEBS is SEBS with the grade A1537 supplied by Kraton Pharmaceuticals, Inc., USA. The low molecular weight polymer SEBS is SEBS with the grade G1726 supplied by Kraton Pharmaceuticals, Inc.

2. The high-resilience hot melt adhesive as described in claim 1, characterized in that, The liquid petroleum resin is selected from Eastman Chemical Company's liquid petroleum resin with brand name C8010 and Shenzhen Yingqun Chemical Co., Ltd.'s liquid petroleum resin with brand name Wingtack 10.

3. The high-resilience hot melt adhesive as described in claim 1, characterized in that, The plasticizer is selected from one of paraffinic oil, naphthenic oil, and aromatic oil.

4. The high-resilience hot melt adhesive as described in claim 1, characterized in that, The tackifying resin is selected from one of hydrogenated terpene resin, hydrogenated DCPD resin, hydrogenated C5 / C9 copolymer resin, hydrogenated C5 petroleum resin, and hydrogenated C9 petroleum resin.

5. The high-resilience hot melt adhesive as described in claim 1, characterized in that, The antioxidant is selected from one of the following: antioxidant model 1010 from Foshan Yuansheng Chemical Co., Ltd., China, and antioxidant model 168 from Foshan Yuansheng Chemical Co., Ltd., China.

6. A method for preparing a high-resilience hot melt adhesive as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heater, start the agitator, and add the formulated amounts of plasticizer, poly-α-methylstyrene resin, tackifying resin, and antioxidant; S2: Raise the temperature of the reactor in S1 to 160-180℃, add the formulated amounts of high molecular weight polymer and low molecular weight polymer, and stir until the polymer melts. S3: Evenly add the formulated amount of liquid petroleum resin to the reaction vessel of S2, and mix thoroughly after all the liquid petroleum resin has melted. S4: After the reaction in S3 is completed, filter the molten material in the reactor; S5: The molten material filtered in S4 is passed through the cooling system and the drying system in sequence, and finally packaged.

7. An elastic composite fabric, characterized in that, It includes a first layer of low-grammage nonwoven fabric, a high-elasticity adhesive layer, and a second layer of low-grammage nonwoven fabric arranged from bottom to top. The nonwoven fabric weight of the first layer of low-grammage nonwoven fabric and the second layer of low-grammage nonwoven fabric does not exceed 15 gsm. The high-elasticity adhesive layer is composed of high-resilience hot melt adhesive as described in any one of claims 1-5.

8. A method for preparing an elastic composite fabric, characterized in that, Includes the following steps: S1: Set the temperature and adhesive application rate of the spraying machine, and spray the high-resilience hot melt adhesive as described in any one of claims 1-5 onto the surface of the low-grammage nonwoven fabric according to the set area. The spraying temperature is 190℃, and the adhesive application rate is set to 20-30g / m². 2 ; S2: When the first layer of low-grammage nonwoven fabric is sprayed with elastic hot melt adhesive through a spraying machine, it is thermally bonded with the second layer of low-grammage nonwoven fabric to produce a non-elastic composite fabric. S3: The non-elastic composite fabric is fed to the stretching roller for more than twice the stretch. The fibers of the upper and lower low-grammage nonwoven fabrics are broken by the gears to obtain the elastic composite fabric.

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