CN115895539A - A kind of high resilience hot melt adhesive and its preparation method and application - Google Patents

Abstract

The invention discloses a high-resilience hot-melt adhesive and its preparation method and application. The high-resilience hot-melt adhesive comprises the following components in parts by weight: high molecular weight polymer SEBS5‑25 parts, low molecular weight polymer SEBS5‑25 parts 15-45 parts of liquid petroleum resin, 10-40 parts of plasticizer, 5-30 parts of tackifying resin, 0.1-2 parts of antioxidant, 1-10 parts of poly-α-methylstyrene resin; high molecular weight polymer The molecular weight of SEBS is higher than 200,000, and the molecular weight of low molecular weight polymer SEBS is less than 100,000. The high-resilience hot-melt adhesive prepared by the present invention has excellent elasticity, heat resistance, and softness, and can be used to prepare elastic compounds, making it more suitable for disposable sanitary products such as sensitive menstrual pants, high-grade baby diapers, etc. field.

Description

A high-rebound hot melt adhesive and its preparation method and application

Technical Field

The present invention relates to the technical field of composite cloth production, and in particular to a high-resilience hot-melt adhesive and a preparation method and application thereof.

Background Art

Non-woven fabric is a kind of fabric that does not require spinning and weaving. It is just that textile short fibers or filaments are oriented or randomly arranged to form a fiber mesh structure. The melt-blown web-forming method is often used in the existing non-woven fabric production. The melt-blown web-forming method is a type of polymer extrusion web-forming method. Its process principle is to form extremely fine short fibers from the extruded polymer melt through a high-speed hot air flow and other methods, and condense them onto a porous drum or curtain net, and make non-woven fabrics through self-bonding or thermal bonding reinforcement. At present, this method has been widely used in the manufacture of non-woven fabrics made of thermoplastic resins such as polypropylene and polyester. However, due to the poor elasticity and hard feel of non-woven fabrics such as polypropylene and polyester, their application in the textile field is limited.

Conventional elastic composite fabrics are formed by 5 layers of nonwovens, hot melt adhesives, elastic materials (spandex materials), hot melt adhesives, and nonwovens. However, the use of spandex elastic materials has the disadvantages of poor hygroscopicity, easy deformation, and easy generation of static electricity. The prior art (Chinese patent ZL201910527946.6, an elastic hot melt pressure-sensitive adhesive and its preparation method and application) replaces the elastic material spandex by developing an elastic hot melt pressure-sensitive adhesive with good elastic recovery rate, and at the same time changes the structure of the traditional elastic composite fabric, simplifying it into a 3-layer elastic composite fabric of nonwovens, hot melt adhesives, and nonwovens. However, the performance of the hot melt adhesive still cannot meet higher demand applications, such as high resilience, heat resistance, and softness, so that it can be better applied to sensitive menstrual pants, high-end infant diapers and other disposable sanitary products.

Summary of the invention

In order to overcome the shortcomings of the prior art, one of the purposes of the present invention is to provide a high-resilience hot melt adhesive. The high-resilience hot melt adhesive prepared by the present invention has excellent elasticity, heat resistance, and softness, and can be used to prepare elastic composites, so that it can be better applied to the field of disposable sanitary products such as sensitive menstrual pants, high-end infant diapers, etc.

A second object of the present invention is to provide a method for preparing a high-resilience hot-melt adhesive.

A third object of the present invention is to provide an elastic composite fabric.

A fourth object of the present invention is to provide a method for preparing an elastic composite fabric.

One of the purposes of the present 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 poly α-methylstyrene resin;

The molecular weight of the high molecular weight polymer SEBS is higher than 200,000, and the molecular weight of the low molecular weight polymer SEBS is lower than 100,000.

Furthermore, the high molecular weight polymer SEBS is preferably one of SEBS with brand A1537 provided by Kraton Corporation of the United States, SEBS with brand 9550 provided by Lee Chang Jung Rubber Company of Taiwan, China, and SEBS with brand YH-503 provided by Yuehua Chemical Industry Co., Ltd. of China.

Furthermore, the low molecular weight polymer SEBS is preferably one of SEBS with brand G1726 provided by Kraton Corporation of the United States, SEBS with brand 9551 provided by Lee Chang Jung Rubber Company of Taiwan, China, and SEBS with brand YH-501 provided by Yuehua Chemical Industry Co., Ltd. of China.

Furthermore, the liquid petroleum resin is selected from one of the liquid petroleum resin with the brand name C8010 produced by Eastman Company and the liquid petroleum resin with the brand name Wingtack 10 produced by Shenzhen Yingqun Chemical Co., Ltd.

Furthermore, the plasticizer is selected from one of paraffin-based oil, naphthenic oil and aromatic oil.

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.

Furthermore, the antioxidant is selected from one of the antioxidant model 1010 produced by Foshan Yuansheng Chemical Co., Ltd., China and the antioxidant model 168 produced by Foshan Yuansheng Chemical Co., Ltd., China.

The second object of the present invention is achieved by adopting the following technical solution: A method for preparing the high resilience hot melt adhesive as described above comprises the following steps:

S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heating, start the stirring paddle, and add the formulated amount of plasticizer, poly-α-methylstyrene resin, tackifying resin and antioxidant;

S2: Raise the temperature of the reactor in S1 to 160-180°C, add the formulated amount of high molecular weight polymer and low molecular weight polymer, and stir until the polymers are melted;

S3: Evenly add the formulated amount of liquid petroleum resin into the reactor of S2, and mix thoroughly after all the liquid petroleum resin is melted;

S4: After the reaction in S3 is completed, the molten material in the reactor is filtered;

S5: The molten material filtered in S4 is sequentially passed through a cooling system and a drying system, and finally packaged.

The third purpose of the present invention is achieved by the following technical solution: an elastic composite fabric, comprising a first layer of low-weight non-woven fabric, a high-elastic adhesive layer, and a second layer of low-weight non-woven fabric arranged from bottom to top, the non-woven fabric grammage of the first layer of low-weight non-woven fabric and the second layer of low-weight non-woven fabric does not exceed 15gsm, and the high-elastic adhesive layer is composed of the high-rebound hot-melt adhesive as described above.

The fourth object of the present invention is achieved by the following technical solution: A method for preparing an elastic composite fabric comprises the following steps:

S1: Set the temperature and glue amount of the spraying machine, and spray the high-resilience hot melt adhesive as described above on the surface of the low-weight non-woven fabric according to the set area. The spraying temperature is 190°C, and the glue amount is set to 20-30g/ ^m2 ;

S2: When the first layer of low-weight non-woven fabric passes through a spraying machine, it is sprayed with elastic hot melt adhesive and thermally laminated with the second layer of low-weight non-woven fabric to form a non-elastic composite fabric;

S3: The non-elastic composite fabric is continuously sent to the stretching roller for more than two times stretching, and the fibers of the upper and lower layers of low-weight non-woven fabrics are cut by gears to obtain an elastic composite fabric.

Compared with the prior art, the present invention has the following beneficial effects:

The hot melt adhesive prepared by the present invention has the characteristics of high viscosity, large cohesive force, good elasticity, good heat resistance, good softness, etc. The composite cloth prepared by the present invention is applied in the field of disposable sanitary products such as sensitive menstrual pants, high-end infant diapers, etc.

DETAILED DESCRIPTION

The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

In the present invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments are all conventional methods in the art unless otherwise specified.

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 poly-α-methylstyrene resin;

The molecular weight of the high molecular weight polymer SEBS is higher than 200,000, and the molecular weight of the low molecular weight polymer SEBS is lower than 100,000.

As a further embodiment, the high molecular weight polymer SEBS is preferably one of SEBS with brand A1537 provided by Kraton Corporation of the United States, SEBS with brand 9550 provided by Lee Chang Jung Rubber Company of Taiwan, China, and SEBS with brand YH-503 provided by Yuehua Chemical Co., Ltd. of China.

As a further embodiment, the low molecular weight polymer SEBS is preferably one of SEBS with brand G1726 provided by Kraton Corporation of the United States, SEBS with brand 9551 provided by Lee Chang Jung Rubber Company of Taiwan, China, and SEBS with brand YH-501 provided by Yuehua Chemical Co., Ltd. of China.

As a further embodiment, the liquid petroleum resin is selected from one of the liquid petroleum resin with a brand name of C8010 produced by Eastman Company and the liquid petroleum resin with a brand name of Wingtack 10 produced by Shenzhen Yingqun Chemical Co., Ltd.

As a further embodiment, the plasticizer is selected from one of paraffin-based oil, naphthenic oil, and aromatic oil. As a more preferred embodiment, the plasticizer is preferably paraffin-based oil, which has better compatibility with high molecular weight polymer SEBS.

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. As a more preferred solution, hydrogenated DCPD petroleum resin and hydrogenated C5 petroleum resin can better enhance the peel strength of the hot melt adhesive.

As a further embodiment, the antioxidant is selected from one of the antioxidants with model number 1010 produced by Foshan Yuansheng Chemical Co., Ltd., China and the antioxidants with model number 168 produced by Foshan Yuansheng Chemical Co., Ltd., China.

The formula principle of the high resilience hot melt adhesive of the present invention is as follows:

In the formula of the present invention, polymers are screened to meet the practical application requirements of high resilience, and high molecular weight polymer SEBS is added to make the hot melt adhesive have a better elastic foundation. The polymer SEBS has a high styrene content, high tensile strength, and excellent resilience. And the polymer SEBS has the characteristics of low melt index and high viscosity. Since the surface viscosity of the hot melt adhesive made of the polymer SEBS is low, it is necessary to add some low molecular weight polymer SEBS to improve the initial adhesion performance of the hot melt adhesive as a whole. The low molecular weight polymer SEBS used has a high diblock content, which can give the hot melt adhesive a strong initial adhesion performance and good wettability to the substrate. Adding liquid petroleum resin to the formula of the present invention can reduce the glass transition temperature of the hot melt adhesive system. Adding the selected plasticizer can improve the compatibility with the high molecular weight polymer SEBS. Adding poly-alpha-methylstyrene resin can improve the high temperature resistance of the hot melt adhesive. The antioxidant in the formula of the present invention can prevent the polymer from oxidizing, resulting in the breakage and cross-linking of the macromolecular chain and deterioration of the performance.

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

S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heating, start the stirring paddle, and add the formulated amount of plasticizer, poly-α-methylstyrene resin, tackifying resin and antioxidant;

S2: Raise the temperature of the reactor in S1 to 160-180°C, add the formulated amount of high molecular weight polymer and low molecular weight polymer, and stir until the polymers are melted;

S3: Evenly add the formulated amount of liquid petroleum resin into the reactor of S2, and mix thoroughly after all the liquid petroleum resin is melted;

S4: After the reaction in S3 is completed, the molten material in the reactor is filtered;

S5: The molten material filtered in S4 is sequentially passed through a cooling system and a drying system, and finally packaged.

The present invention also provides an elastic composite fabric, comprising a first layer of low-weight non-woven fabric, a high-elastic adhesive layer, and a second layer of low-weight non-woven fabric arranged from bottom to top, wherein the non-woven fabric weight of the first layer of low-weight non-woven fabric and the second layer of low-weight non-woven fabric does not exceed 15gsm, and the low-weight substrate is selected so that the fibers are easily broken after being stretched after being made into the elastic composite fabric in the later stage. The high-elastic adhesive layer is composed of the high-rebound hot-melt adhesive as described above. The elastic composite fabric of the present invention will adopt three layers of low-weight non-woven fabric + elastic adhesive + low-weight non-woven fabric, the first layer of non-woven fabric can be spunbond non-woven fabric, spunlace non-woven fabric, and the weight of the non-woven fabric does not exceed 15gsm, and the third layer of non-woven fabric is made of the same material as the first layer of non-woven fabric. The second layer is elastic glue. The hot melt glue used in the present 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 glue made by the present invention has the characteristics of high viscosity, large cohesion, good elasticity, etc. The composite cloth made by the present invention can be used in the field of disposable sanitary products such as sensitive menstrual pants, baby diapers, etc.

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

S1: Set the temperature and glue amount of the sprayer, and spray the high resilience hot melt adhesive as described above on the surface of the low-weight non-woven fabric according to the set area. The spraying temperature is 190°C, and the glue amount is set to 20-30g/ ^m2 ; the glue amount of the hot melt adhesive of the invention is 20-30gsm, which is a little less than the glue amount of the existing product (ZL201910527946.6-an elastic hot melt pressure-sensitive adhesive). On the one hand, this is because the high resilience hot melt adhesive has achieved results in cost saving and reduced costs. On the other hand, too much glue will affect the softness of the elastic non-woven fabric.

S2: When the first layer of low-weight non-woven fabric passes through a spraying machine, it is sprayed with elastic hot melt adhesive and thermally laminated with the second layer of low-weight non-woven fabric to form a non-elastic composite fabric;

S3: The non-elastic composite fabric is continuously sent to the stretching roller for more than two times stretching, and the fibers of the upper and lower layers of low-weight non-woven fabrics are cut by gears to obtain an elastic composite fabric.

The following are specific embodiments of the present invention. Unless otherwise specified, the raw materials, equipment, etc. used in the following embodiments can be obtained by purchase.

Example 1-Example 3 and Comparative Examples 1-10

The raw materials were weighed according to the ratios in Table 1, and hot melt adhesives were prepared according to the hot melt adhesive preparation method in Table 1, and hot melt adhesives of different examples were obtained. See Table 1 for details, and then elastic composite fabrics were prepared according to the composite fabric preparation method in Table 1, and elastic composite fabrics of different examples were obtained:

Table 1 Raw material ratio table of Examples 1-3 and Comparative Examples 1-9

If not otherwise specified, the high molecular weight polymer SEBS in Table 1 is preferably SEBS with a grade of A1537 provided by Kraton, USA, the low molecular weight polymer SEBS is preferably SEBS with a grade of G1726 provided by Kraton, USA, the liquid petroleum resin is selected from the liquid petroleum resin with a grade of C8010 of Eastman Company, the plasticizer is selected from paraffin-based oil, the tackifying resin is selected from hydrogenated terpene resin, the antioxidant is selected from the antioxidant model 1010 of Foshan Yuansheng Chemical Co., Ltd., China, and the poly-alpha-methylstyrene resin is purchased from the poly-alpha-methylstyrene resin with a grade of 5140 of Eastman Company, USA.

Comparative Example 1

The difference between Comparative Example 1 and Example 2 is that high molecular weight polymer SEBS is not added, and the remaining components, amounts, and process parameters are the same as those of Example 2.

Comparative Example 2

The difference between Comparative Example 2 and Example 2 is that the low molecular weight polymer SEBS is not added, and the other components, amounts, and process parameters are the same as those of Example 2.

Comparative Example 3

The difference between Comparative Example 3 and Example 2 is that no liquid petroleum resin is added, and the remaining components, amounts, and process parameters are the same as those of Example 2.

Comparative Example 4

The difference between Comparative Example 4 and Example 2 is that no plasticizer is added, and the remaining components, amounts, and process parameters are the same as those of Example 2.

Comparative Example 5

The difference between Comparative Example 5 and Example 2 is that no tackifying resin is added, and the remaining components, amounts, and process parameters are the same as those of Example 2.

Comparative Example 6

The difference between Comparative Example 6 and Example 2 is that no poly-α-methylstyrene resin is added, and the remaining components, amounts, and process parameters are the same as those of Example 2.

Comparative Example 7

The difference between Comparative Example 7 and Example 2 is that SIS is used instead of SEBS, wherein SIS is purchased from SIS with a brand number of 1170 provided by Shandong Jusheng Company, and the other components, dosages, and process parameters are the same as those in Example 2.

Comparative Example 8

The difference between Comparative Example 8 and Example 2 is that SBS is used instead of SEBS, wherein the SBS is purchased from SBS with a brand number of 3546 provided by Lee Chang Rong Co., Ltd. in Taiwan, China, and the other components, dosages, and process parameters are the same as those in Example 2.

Comparative Example 9

The difference between Comparative Example 9 and Example 2 is that conventional heat-resistant component polyimide resin is used instead of poly-α-methylstyrene resin, and the remaining components, amounts, and process parameters are the same as those in Example 2.

Comparative Example 10 (Existing product: Patent application number ZL202111613371.3, envelope-type elastic nonwoven fabric)

Comparative Example 10 is an existing patented product, an envelope-type elastic non-woven fabric, comprising a first filament fiber layer located in the lower layer, a spandex fiber layer located in the middle layer, and a second filament fiber layer located in the upper layer. It is specifically prepared by the method of Example 1 in the specification of patent application No. ZL202111613371.3.

The hot melt adhesive preparation method of Examples 1 to 3 and Comparative Examples 1 to 9 comprises the following steps:

S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heating, start the stirring paddle, and add the formulated amount of plasticizer, poly-α-methylstyrene resin, tackifying resin and antioxidant;

S2: Raise the temperature of the reactor in S1 to 160-180°C, add the formulated amount of high molecular weight polymer and low molecular weight polymer, and stir until the polymers are melted;

S3: Evenly add the formulated amount of liquid petroleum resin into the reactor of S2, and mix thoroughly after all the liquid petroleum resin is melted;

S4: After the reaction in S3 is completed, the molten material in the reactor is filtered;

S5: The molten material filtered in S4 is sequentially passed through a cooling system and a drying system, and finally packaged.

The composite fabrics of Examples 1 to 3 and Comparative Examples 1 to 9 include a first layer of low-weight non-woven fabric, a hot-melt adhesive layer, and a second layer of low-weight non-woven fabric arranged from bottom to top, wherein the weight of the first layer of low-weight non-woven fabric and the second layer of low-weight non-woven fabric does not exceed 15 gsm, and the hot-melt adhesive layer is formed by spraying the hot-melt adhesive obtained in the above-mentioned examples.

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

S1: Set the temperature and glue amount of the spraying machine, and spray the high-resilience hot melt adhesive as described above on the surface of the low-weight non-woven fabric according to the set area. The spraying temperature is 190°C, and the glue amount is set to 20-30g/ ^m2 ;

S2: When the first layer of low-weight non-woven fabric passes through a spraying machine, the hot melt adhesive obtained in each example is sprayed, and the first layer of low-weight non-woven fabric is thermally laminated with the second layer of low-weight non-woven fabric to form a non-elastic composite fabric;

S3: The non-elastic composite fabric is continuously sent to the stretching roller for more than two times stretching, and the fibers of the upper and lower layers of low-weight non-woven fabrics are cut by gears to obtain an elastic composite fabric.

Effect evaluation and performance testing

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 rates of the composite fabrics prepared in Examples 1-3 and Comparative Examples 1-10 were tested. See Table 2 for the test items and results.

(1) Viscosity test method

The viscosity was measured in accordance with GB/T 2794 using a DV2TRVT viscometer and a No. 27 spindle from Brookfield, USA. The results were recorded in centipoise (cps).

(2) Softening point test method

The softening point was tested in accordance with GB/T 15332 using the SD-0606T automatic softening point tester from the Shanghai Institute of Geoscience Instruments. The results were recorded in degrees Celsius (°C).

(3) Shrinkage test method

The prepared composite fabric was stretched from 85mm to 170mm, fixed at both ends, and placed in a 40℃ constant temperature oven. After 1 hour, one end was removed, and the length L of the composite fabric after the test was measured. The shrinkage rate (%) = L/85*100. The composite fabric was placed in a 40℃ constant temperature oven to measure its shrinkage rate, mainly to simulate the human body temperature of 37℃, which reflects the heat resistance of the elastic glue on the one hand, and the resilience of the elastic glue on the other hand.

Table 2 shows the performance test data of the hot melt adhesive and composite fabric obtained in each example

Note: A shrinkage rate of 100% indicates the best resilience, and a shrinkage rate of 200% indicates no shrinkage.

As shown in the above table, the elastic hot melt adhesive prepared by the present invention has excellent resilience, heat resistance and softness, and is suitable for making elastic composite fabrics for use in the elastic waist areas of sensitive menstrual pants, high-end infant diapers, pull-up pants and other disposable absorbent products, giving excellent properties to various parts of the waist area.

Compared with Example 2, the difference of Comparative Example 1 is that no high molecular weight polymer SEBS is added, and the hot melt adhesive prepared therefrom has a low softening point, low viscosity, and high shrinkage rate.

Compared with Example 2, the difference of Comparative Example 2 is that no low molecular weight polymer SEBS is added, and the hot melt adhesive prepared thereby affects the shrinkage performance.

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

Compared with Example 2, the difference in Comparative Example 4 is that no plasticizer is added, and the hot melt adhesive prepared thereby affects the shrinkage performance.

Compared with Example 2, the difference in Comparative Example 5 is that no tackifying resin is added, and the hot melt adhesive prepared thereby affects the shrinkage performance.

Compared with Example 2, Comparative Example 6 is different in that no poly-α-methylstyrene resin is added, and the hot melt adhesive prepared thereby affects the shrinkage performance.

Compared with Example 2, the difference of Comparative Examples 7-8 is that the polymer SEBS of the present invention is replaced by the existing commonly used polymers SIS and SBS, and the hot melt adhesive prepared therefrom basically does not shrink. It can be seen that the elastic adhesive of the present invention has more excellent resilience.

Compared with Example 2, the difference of Comparative Example 9 is that conventional heat-resistant component polyimide resin is used instead of poly-α-methylstyrene resin, and the existing conventional heat-resistant component polyimide resin is incompatible with the hot melt adhesive system of the present application.

Comparative Example 10 is an existing patented product, an envelope-type elastic non-woven fabric. The high-elastic hot-melt adhesive prepared by the present invention is applied to the composite fabric. The composite fabric is softer and more suitable for infants with delicate skin. It broadens the application scenarios of the composite fabric and can be applied to the elastic waist area of disposable absorbent products such as high-end diapers and pull-up pants, giving each part of the waist area excellent stretch properties.

The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims (10)

1. A high resilience hot melt adhesive, characterized in that it 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 poly α-methylstyrene resin; The molecular weight of the high molecular weight polymer SEBS is higher than 200,000, and the molecular weight of the low molecular weight polymer SEBS is lower than 100,000. 2. The high resilience hot melt adhesive as described in claim 1 is characterized in that the high molecular weight polymer SEBS is preferably one of the SEBS with brand A1537 provided by Kraton Corporation of the United States, the SEBS with brand 9550 provided by Lee Chang Jung Rubber Company of Taiwan, China, and the SEBS with brand YH-503 provided by Yuehua Chemical Company of China. 3. The high resilience hot melt adhesive as described in claim 1 is characterized in that the low molecular weight polymer SEBS is preferably one of the SEBS with a brand name of G1726 provided by Kraton Corporation of the United States, the SEBS with a brand name of 9551 provided by Lee Chang Jung Rubber Company of Taiwan, China, and the SEBS with a brand name of YH-501 provided by Yuehua Chemical Company of China. 4. The high resilience hot melt adhesive according to claim 1, characterized in that the liquid petroleum resin is selected from one of the liquid petroleum resin with a brand name of C8010 produced by Eastman Company and the liquid petroleum resin with a brand name of Wingtack 10 produced by Shenzhen Yingqun Chemical Co., Ltd. 5. The high resilience hot melt adhesive according to claim 1, characterized in that the plasticizer is selected from one of paraffin-based oil, cycloparaffinic oil and aromatic oil. 6. The high resilience hot melt adhesive according to 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. 7. The high resilience hot melt adhesive according to claim 1, characterized in that the antioxidant is selected from one of the antioxidant model 1010 of Foshan Yuansheng Chemical Co., Ltd., China and the antioxidant model 168 of Foshan Yuansheng Chemical Co., Ltd., China. 8. A method for preparing the high resilience hot melt adhesive according to any one of claims 1 to 7, characterized in that it comprises the following steps: S1: Confirm that the bottom valve of the reactor is closed, turn on the steam heating, start the stirring paddle, and add the formulated amount of plasticizer, poly-α-methylstyrene resin, tackifying resin and antioxidant; S2: Raise the temperature of the reactor in S1 to 160-180°C, add the formulated amount of high molecular weight polymer and low molecular weight polymer, and stir until the polymers are melted; S3: Evenly add the formulated amount of liquid petroleum resin into the reactor of S2, and mix thoroughly after all the liquid petroleum resin is melted; S4: After the reaction in S3 is completed, the molten material in the reactor is filtered; S5: The molten material filtered in S4 is sequentially passed through a cooling system and a drying system, and finally packaged. 9. An elastic composite fabric, characterized in that it comprises a first layer of low-weight non-woven fabric, a high-elastic adhesive layer, and a second layer of low-weight non-woven fabric arranged from bottom to top, wherein the non-woven fabric grammage of the first layer of low-weight non-woven fabric and the second layer of low-weight non-woven fabric does not exceed 15gsm, and the high-elastic adhesive layer is composed of the high-resilience hot-melt adhesive as described in any one of claims 1 to 7. 10. A method for preparing an elastic composite fabric, characterized by comprising the following steps: S1: Setting the temperature and glue amount of the spraying machine, spraying the high resilience hot melt adhesive as claimed in any one of claims 1 to 7 on the surface of the low-weight non-woven fabric according to the set area, the spraying temperature is 190° C., and the glue amount is set to 20-30 g/m ² ; S2: When the first layer of low-weight non-woven fabric passes through a spraying machine, it is sprayed with elastic hot melt adhesive and thermally laminated with the second layer of low-weight non-woven fabric to form a non-elastic composite fabric; S3: The non-elastic composite fabric is continuously sent to the stretching roller for more than two times stretching, and the fibers of the upper and lower layers of low-weight non-woven fabrics are cut by gears to obtain an elastic composite fabric.