CN112480655A - High-elasticity composite material for surface of pike racket and preparation process thereof - Google Patents

Abstract

The invention discloses a high-elasticity composite material for a surface of a pick bat and a preparation process thereof, wherein the high-elasticity composite material comprises the following raw materials in parts by weight: 30-50 parts of composite elastomer, 1-3 parts of cross-linking agent, 0.15-0.18 part of catalyst and 5-10 parts of styrene; adding the composite elastomer, the cross-linking agent, the catalyst and the styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60-70 ℃, pouring into a mold, discharging bubbles for 2min in vacuum, transferring into a drying box at 90-100 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, curing for 10h at 110-120 ℃ to obtain the high-elasticity composite material for the surface of the pick pat; toluene diisocyanate is grafted on the surface of the carbon nano tube to prepare a filler, then the filler and the first elastomer are mixed and cured in a vulcanizing machine to prepare the composite elastomer, and the composite elastomer can be endowed with excellent mechanical properties by adding the filler.

Description

High-elasticity composite material for surface of pike racket and preparation process thereof

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-elasticity composite material for a Pickering racket surface and a preparation process thereof.

Background

The existing elastic materials are various, and are used in sports goods materials, materials such as EVA (ethylene vinyl acetate), Baoyiyou (environmental protection regenerated cotton), XPE (XPE), SBR (styrene butadiene rubber), latex, high-density MDI (diphenyl-methane-diisocyanate) foam cotton, butadiene rubber and the like are commonly used, and the rebound resilience of the materials is not more than 75%; polyurethanes are a very versatile class of synthetic materials, and are produced industrially primarily from the reaction of a polybasic organic isocyanate with various hydrogen donor compounds (usually, hydroxyl-terminated polyol compounds). Different numbers of functional groups and different types of functional groups are selected, and different synthesis processes are adopted, so that polyurethane products with different properties and various apparent forms can be prepared.

The polyurethane products are very rich in variety, including flexible to hard foamed plastics, elastic rubber with excellent wear resistance, high-gloss paint and coating, high-resilience synthetic fiber, synthetic leather with excellent bending resistance and the like, and a novel synthetic material series with various varieties and excellent performance is gradually formed.

The invention patent CN106279616A relates to an ultra-high elastic material, a preparation method and application thereof. The ultrahigh elastic material is characterized in that: is prepared from a material A and a material B; the material A comprises the following components in parts by weight: 70-100 parts of hexafunctional polyether polyol, 0-30 parts of high-activity polymer polyol, 0.25-0.35 part of foaming agent, 1-3.5 parts of cross-linking agent, 0.18-1.08 parts of catalyst and 0.1-0.5 part of silane surfactant; the material B is polyether polyol modified diphenylmethane diisocyanate prepolymer, and the material B accounts for 30-35% of the total weight of the material A.

Disclosure of Invention

In order to overcome the technical problems, the invention provides a high-elasticity composite material for a pick racket surface and a preparation process thereof.

In step S2, the surface of a carbon nano tube is firstly acidified to remove surface impurities, then the carbon nano tube is mixed with toluene diisocyanate, dibutyltin dilaurate is added to serve as a catalyst, the toluene diisocyanate is grafted on the surface of the carbon nano tube to prepare a filler, then the filler and a first elastomer are mixed and cured in a vulcanizing machine to prepare a composite elastomer, and the composite elastomer can be endowed with excellent mechanical properties by adding the filler.

The purpose of the invention can be realized by the following technical scheme:

a high-elasticity composite material for a surface of a pike bat comprises the following raw materials in parts by weight: 30-50 parts of composite elastomer, 1-3 parts of cross-linking agent, 0.15-0.18 part of catalyst and 5-10 parts of styrene;

the high-elasticity composite material for the surface of the pick racket is prepared by the following method:

adding the composite elastomer, the cross-linking agent, the catalyst and the styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60-70 ℃, pouring into a mold, discharging bubbles for 2min under vacuum, transferring into a drying box at 90-100 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, curing for 10h at 110-120 ℃ to obtain the high-elasticity composite material for the surface of the pick pat.

Further, the cross-linking agent is one or two of glycerol and trimethylolethane which are mixed according to any proportion, and the catalyst is one or two of ethylenediamine and triethylamine which are mixed according to any proportion.

Further, the composite elastomer is prepared by the following method:

step S1, adding polytetrahydrofuran into a three-neck flask, heating in a water bath at the temperature of 100 ℃ and 120 ℃ for 2h, then cooling to 50-60 ℃, adding dimethylacetamide, magnetically stirring for 30min, then sequentially adding dibutyltin dilaurate and hexamethylene diisocyanate, heating to 65-75 ℃, and reacting at the temperature for 2h to obtain a prepolymer; adding depolymerized lignin into dimethylacetamide, uniformly stirring for 30min to obtain a mixed solution, adding the mixed solution into a prepolymer, magnetically stirring and reacting for 4h to obtain a reaction product, adding the reaction product into a polytetrafluoroethylene mold, standing for 10h, then heating to 75-85 ℃, volatilizing at the temperature for 10h to obtain a sample, hot-pressing the sample at 150 ℃ and 5MPa for 10min to obtain a first elastomer, wherein the weight ratio of polytetrahydrofuran, dimethylacetylate, dibutyl dilaurate to hexamethylene diisocyanate is controlled to be 5: 10: 0.01: 0.5, the weight ratio of depolymerized lignin to dimethylacetamide is 1: 20, and the weight ratio of the mixed solution to prepolymer is 1: 3-5;

step S2, adding a carbon nano tube into a three-neck flask, adding mixed acid and ultrasonically dispersing for 1h, controlling the ultrasonic power to be 50-60W, then heating in an oil bath at 50-60 ℃, condensing and refluxing for 3h, then washing with deionized water to be neutral, drying to prepare an acidified carbon nano tube, then adding the acidified carbon nano tube into toluene, introducing nitrogen, heating to 60-70 ℃, adding toluene diisocyanate and dibutyltin dilaurate, stirring and reacting for 10h, performing suction filtration, washing with toluene until toluene diisocyanate does not exist, preparing a filler, controlling the weight ratio of the carbon nano tube to the mixed acid to be 1: 50, and controlling the weight ratio of the acidified carbon nano tube to the toluene diisocyanate to be 1: 10: 0.1-0.15;

and step S3, adding the filler and the first elastomer into a vulcanizing machine according to the weight ratio of 1: 10, curing for 30min under the pressure of 10MPa, then demolding, and curing for 20h in a drying oven at 100 ℃ to obtain the composite elastomer.

Step S1 is to prepare a prepolymer from polytetrahydrofuran, hexamethylene diisocyanate and other raw materials, then add depolymerized lignin into dimethylacetamide to prepare a mixed solution, mix the mixed solution and the prepolymer to prepare an elastomer, during the preparation process, a large amount of phenolic hydroxyl groups are generated on the depolymerized lignin, the reaction activity of the lignin can be improved, and the increase of the phenolic hydroxyl groups means that the lignin can form more hydrogen bonds in the prepolymer, the physical crosslinking of the lignin and a prepolymer matrix is enhanced, and the mechanical property of the lignin-based elastomer is improved Curing to obtain the composite elastomer, and adding the filler to endow the composite elastomer with excellent mechanical properties.

Further, the depolymerized lignin is an alkaline depolymerized lignin.

Further, in step S2, the mixed acid is formed by mixing sulfuric acid with the mass fraction of 70% and nitric acid with the mass fraction of 60% according to the volume ratio of 3: 1.

A preparation process of a high-elasticity composite material for a surface of a pick pat comprises the following steps:

adding the composite elastomer, the cross-linking agent, the catalyst and the styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60-70 ℃, pouring into a mold, discharging bubbles for 2min under vacuum, transferring into a drying box at 90-100 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, curing for 10h at 110-120 ℃ to obtain the high-elasticity composite material for the surface of the pick pat.

The invention has the beneficial effects that:

the invention relates to a high-elasticity composite material for a Pickle surface, which is prepared from raw materials such as a composite elastomer and the like, wherein in the preparation process of the composite elastomer, a prepolymer is prepared from the raw materials such as polytetrahydrofuran, hexamethylene diisocyanate and the like in step S1, then depolymerized lignin is added into dimethylacetamide to prepare a mixed solution, the mixed solution and the prepolymer are mixed to prepare the elastomer, a large amount of phenolic hydroxyl groups can be generated on the depolymerized lignin in the preparation process, the reaction activity of the lignin can be improved, the increase of the phenolic hydroxyl groups means that the lignin can form more hydrogen bonds in the prepolymer, the physical crosslinking of the lignin and a prepolymer matrix is enhanced, the mechanical property of the lignin-based elastomer is improved, in step S2, the surface of a carbon nano tube is firstly acidified, surface impurities are removed, then the carbon nano tube is mixed with toluene diisocyanate, dibutyltin, toluene diisocyanate is grafted on the surface of the carbon nano tube to prepare a filler, then the filler and the first elastomer are mixed and cured in a vulcanizing machine to prepare a composite elastomer, and the composite elastomer can be endowed with excellent mechanical property by adding the filler, so that the prepared high-elasticity composite material is endowed with excellent elasticity and mechanical property.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A high-elasticity composite material for a surface of a pike bat comprises the following raw materials in parts by weight: 30 parts of composite elastomer, 1 part of glycerol, 0.15 part of ethylenediamine and 5 parts of styrene;

the high-elasticity composite material for the surface of the pick racket is prepared by the following method:

adding the composite elastomer, glycerol, ethylenediamine and styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60 ℃, pouring into a mold, discharging bubbles in vacuum for 2min, then transferring into a drying oven at 90 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, and curing for 10h at 110 ℃ to obtain the high-elasticity composite material for the surface of a Pickle.

The composite elastomer is prepared by the following method:

step S1, adding polytetrahydrofuran into a three-neck flask, heating in a water bath at 100 ℃ for 2h, then cooling to 50 ℃, adding dimethylacetamide, magnetically stirring for 30min, then sequentially adding dibutyltin dilaurate and hexamethylene diisocyanate, heating to 65 ℃, and reacting at the temperature for 2h to obtain a prepolymer; adding depolymerized lignin into dimethylacetamide, uniformly stirring for 30min to obtain a mixed solution, adding the mixed solution into a prepolymer, magnetically stirring and reacting for 4h to obtain a reaction product, adding the reaction product into a polytetrafluoroethylene mold, standing for 10h, then heating to 75 ℃, volatilizing at the temperature for 10h to obtain a sample, hot-pressing the sample at 150 ℃ and 5MPa for 10min to obtain a first elastomer, wherein the weight ratio of polytetrahydrofuran, dimethylacethyl, dibutyl dilaurate to hexamethylene diisocyanate is controlled to be 5: 10: 0.01: 0.5, the weight ratio of depolymerized lignin to dimethylacetamide is 1: 20, and the weight ratio of the mixed solution to prepolymer is 1: 3;

step S2, adding a carbon nano tube into a three-neck flask, adding mixed acid and ultrasonically dispersing for 1h, controlling the ultrasonic power to be 50W, then heating in an oil bath at 50 ℃, carrying out condensation reflux for 3h, then washing with deionized water to be neutral, drying to obtain an acidified carbon nano tube, then adding the acidified carbon nano tube into toluene, introducing nitrogen, heating to 60 ℃, adding toluene diisocyanate and dibutyltin dilaurate, stirring and reacting for 10h, carrying out suction filtration, washing with toluene until no toluene diisocyanate exists, preparing a filler, controlling the weight ratio of the carbon nano tube to the mixed acid to be 1: 50, and controlling the weight ratio of the acidified carbon nano tube to the dibutyltin dilaurate to be 1: 10: 0.1;

and step S3, adding the filler and the first elastomer into a vulcanizing machine according to the weight ratio of 1: 10, curing for 30min under the pressure of 10MPa, then demolding, and curing for 20h in a drying oven at 100 ℃ to obtain the composite elastomer.

Example 2

A high-elasticity composite material for a surface of a pike bat comprises the following raw materials in parts by weight: 35 parts of composite elastomer, 2 parts of glycerol, 0.16 part of ethylenediamine and 6 parts of styrene;

the high-elasticity composite material for the surface of the pick racket is prepared by the following method:

adding the composite elastomer, glycerol, ethylenediamine and styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60 ℃, pouring into a mold, discharging bubbles in vacuum for 2min, then transferring into a drying oven at 90 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, and curing for 10h at 110 ℃ to obtain the high-elasticity composite material for the surface of a Pickle.

The composite elastomer is prepared by the following method:

step S1, adding polytetrahydrofuran into a three-neck flask, heating in a water bath at 100 ℃ for 2h, then cooling to 50 ℃, adding dimethylacetamide, magnetically stirring for 30min, then sequentially adding dibutyltin dilaurate and hexamethylene diisocyanate, heating to 65 ℃, and reacting at the temperature for 2h to obtain a prepolymer; adding depolymerized lignin into dimethylacetamide, uniformly stirring for 30min to obtain a mixed solution, adding the mixed solution into a prepolymer, magnetically stirring and reacting for 4h to obtain a reaction product, adding the reaction product into a polytetrafluoroethylene mold, standing for 10h, then heating to 75 ℃, volatilizing at the temperature for 10h to obtain a sample, hot-pressing the sample at 150 ℃ and 5MPa for 10min to obtain a first elastomer, wherein the weight ratio of polytetrahydrofuran, dimethylacethyl, dibutyl dilaurate to hexamethylene diisocyanate is controlled to be 5: 10: 0.01: 0.5, the weight ratio of depolymerized lignin to dimethylacetamide is 1: 20, and the weight ratio of the mixed solution to prepolymer is 1: 3;

step S2, adding a carbon nano tube into a three-neck flask, adding mixed acid and ultrasonically dispersing for 1h, controlling the ultrasonic power to be 50W, then heating in an oil bath at 50 ℃, carrying out condensation reflux for 3h, then washing with deionized water to be neutral, drying to obtain an acidified carbon nano tube, then adding the acidified carbon nano tube into toluene, introducing nitrogen, heating to 60 ℃, adding toluene diisocyanate and dibutyltin dilaurate, stirring and reacting for 10h, carrying out suction filtration, washing with toluene until no toluene diisocyanate exists, preparing a filler, controlling the weight ratio of the carbon nano tube to the mixed acid to be 1: 50, and controlling the weight ratio of the acidified carbon nano tube to the dibutyltin dilaurate to be 1: 10: 0.1;

and step S3, adding the filler and the first elastomer into a vulcanizing machine according to the weight ratio of 1: 10, curing for 30min under the pressure of 10MPa, then demolding, and curing for 20h in a drying oven at 100 ℃ to obtain the composite elastomer.

Example 3

A high-elasticity composite material for a surface of a pike bat comprises the following raw materials in parts by weight: 45 parts of composite elastomer, 2 parts of glycerol, 0.17 part of ethylenediamine and 8 parts of styrene;

the high-elasticity composite material for the surface of the pick racket is prepared by the following method:

adding the composite elastomer, glycerol, ethylenediamine and styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60 ℃, pouring into a mold, discharging bubbles in vacuum for 2min, then transferring into a drying oven at 90 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, and curing for 10h at 110 ℃ to obtain the high-elasticity composite material for the surface of a Pickle.

The composite elastomer is prepared by the following method:

step S1, adding polytetrahydrofuran into a three-neck flask, heating in a water bath at 100 ℃ for 2h, then cooling to 50 ℃, adding dimethylacetamide, magnetically stirring for 30min, then sequentially adding dibutyltin dilaurate and hexamethylene diisocyanate, heating to 65 ℃, and reacting at the temperature for 2h to obtain a prepolymer; adding depolymerized lignin into dimethylacetamide, uniformly stirring for 30min to obtain a mixed solution, adding the mixed solution into a prepolymer, magnetically stirring and reacting for 4h to obtain a reaction product, adding the reaction product into a polytetrafluoroethylene mold, standing for 10h, then heating to 75 ℃, volatilizing at the temperature for 10h to obtain a sample, hot-pressing the sample at 150 ℃ and 5MPa for 10min to obtain a first elastomer, wherein the weight ratio of polytetrahydrofuran, dimethylacethyl, dibutyl dilaurate to hexamethylene diisocyanate is controlled to be 5: 10: 0.01: 0.5, the weight ratio of depolymerized lignin to dimethylacetamide is 1: 20, and the weight ratio of the mixed solution to prepolymer is 1: 3;

step S2, adding a carbon nano tube into a three-neck flask, adding mixed acid and ultrasonically dispersing for 1h, controlling the ultrasonic power to be 50W, then heating in an oil bath at 50 ℃, carrying out condensation reflux for 3h, then washing with deionized water to be neutral, drying to obtain an acidified carbon nano tube, then adding the acidified carbon nano tube into toluene, introducing nitrogen, heating to 60 ℃, adding toluene diisocyanate and dibutyltin dilaurate, stirring and reacting for 10h, carrying out suction filtration, washing with toluene until no toluene diisocyanate exists, preparing a filler, controlling the weight ratio of the carbon nano tube to the mixed acid to be 1: 50, and controlling the weight ratio of the acidified carbon nano tube to the dibutyltin dilaurate to be 1: 10: 0.1;

and step S3, adding the filler and the first elastomer into a vulcanizing machine according to the weight ratio of 1: 10, curing for 30min under the pressure of 10MPa, then demolding, and curing for 20h in a drying oven at 100 ℃ to obtain the composite elastomer.

Example 4

A high-elasticity composite material for a surface of a pike bat comprises the following raw materials in parts by weight: 50 parts of composite elastomer, 3 parts of glycerol, 0.18 part of ethylenediamine and 10 parts of styrene;

the high-elasticity composite material for the surface of the pick racket is prepared by the following method:

adding the composite elastomer, glycerol, ethylenediamine and styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60 ℃, pouring into a mold, discharging bubbles in vacuum for 2min, then transferring into a drying oven at 90 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, and curing for 10h at 110 ℃ to obtain the high-elasticity composite material for the surface of a Pickle.

The composite elastomer is prepared by the following method:

step S1, adding polytetrahydrofuran into a three-neck flask, heating in a water bath at 100 ℃ for 2h, then cooling to 50 ℃, adding dimethylacetamide, magnetically stirring for 30min, then sequentially adding dibutyltin dilaurate and hexamethylene diisocyanate, heating to 65 ℃, and reacting at the temperature for 2h to obtain a prepolymer; adding depolymerized lignin into dimethylacetamide, uniformly stirring for 30min to obtain a mixed solution, adding the mixed solution into a prepolymer, magnetically stirring and reacting for 4h to obtain a reaction product, adding the reaction product into a polytetrafluoroethylene mold, standing for 10h, then heating to 75 ℃, volatilizing at the temperature for 10h to obtain a sample, hot-pressing the sample at 150 ℃ and 5MPa for 10min to obtain a first elastomer, wherein the weight ratio of polytetrahydrofuran, dimethylacethyl, dibutyl dilaurate to hexamethylene diisocyanate is controlled to be 5: 10: 0.01: 0.5, the weight ratio of depolymerized lignin to dimethylacetamide is 1: 20, and the weight ratio of the mixed solution to prepolymer is 1: 3;

step S2, adding a carbon nano tube into a three-neck flask, adding mixed acid and ultrasonically dispersing for 1h, controlling the ultrasonic power to be 50W, then heating in an oil bath at 50 ℃, carrying out condensation reflux for 3h, then washing with deionized water to be neutral, drying to obtain an acidified carbon nano tube, then adding the acidified carbon nano tube into toluene, introducing nitrogen, heating to 60 ℃, adding toluene diisocyanate and dibutyltin dilaurate, stirring and reacting for 10h, carrying out suction filtration, washing with toluene until no toluene diisocyanate exists, preparing a filler, controlling the weight ratio of the carbon nano tube to the mixed acid to be 1: 50, and controlling the weight ratio of the acidified carbon nano tube to the dibutyltin dilaurate to be 1: 10: 0.1;

and step S3, adding the filler and the first elastomer into a vulcanizing machine according to the weight ratio of 1: 10, curing for 30min under the pressure of 10MPa, then demolding, and curing for 20h in a drying oven at 100 ℃ to obtain the composite elastomer.

Comparative example 1

This comparative example compares to example 1 with a polyurethane elastomer instead of a composite elastomer.

Comparative example 2

The comparative example is a high-elasticity composite material for a pike surface in the market.

The elastic properties of examples 1 to 4 and comparative examples 1 to 2 were measured, and the results are shown in the following table;

as can be seen from the above table, examples 1 to 4 had a compression set of 7 to 9% and a rebound resilience of 85 to 88%, comparative examples 1 to 3 had a compression set of 22 to 25% and a rebound resilience of 75 to 76%; therefore, the filler and the first elastomer are mixed and cured in a vulcanizing machine to prepare the composite elastomer, and the filler is added to endow the composite elastomer with excellent mechanical properties, so that the prepared high-elasticity composite material has excellent elasticity and mechanical properties.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (6)

1. The high-elasticity composite material for the surface of the pike bat is characterized by comprising the following raw materials in parts by weight: 30-50 parts of composite elastomer, 1-3 parts of cross-linking agent, 0.15-0.18 part of catalyst and 5-10 parts of styrene;

the high-elasticity composite material for the surface of the pick racket is prepared by the following method:

adding the composite elastomer, the cross-linking agent, the catalyst and the styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60-70 ℃, pouring into a mold, discharging bubbles for 2min under vacuum, transferring into a drying box at 90-100 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, curing for 10h at 110-120 ℃ to obtain the high-elasticity composite material for the surface of the pick pat.

2. The high-elasticity composite material for the surface of a pike bat as claimed in claim 1, wherein the cross-linking agent is one or two of glycerol and trimethylolethane mixed in any proportion, and the catalyst is one or two of ethylenediamine and triethylamine mixed in any proportion.

3. A high elastic composite material for a pexophone surface as claimed in claim 1 wherein said composite elastomer is made by the process of:

step S1, adding polytetrahydrofuran into a three-neck flask, heating in a water bath at the temperature of 100 ℃ and 120 ℃ for 2h, then cooling to 50-60 ℃, adding dimethylacetamide, magnetically stirring for 30min, then sequentially adding dibutyltin dilaurate and hexamethylene diisocyanate, heating to 65-75 ℃, and reacting at the temperature for 2h to obtain a prepolymer; adding depolymerized lignin into dimethylacetamide, uniformly stirring for 30min to obtain a mixed solution, adding the mixed solution into a prepolymer, magnetically stirring and reacting for 4h to obtain a reaction product, adding the reaction product into a polytetrafluoroethylene mold, standing for 10h, then heating to 75-85 ℃, volatilizing at the temperature for 10h to obtain a sample, hot-pressing the sample at 150 ℃ and 5MPa for 10min to obtain a first elastomer, wherein the weight ratio of polytetrahydrofuran, dimethylacetylate, dibutyl dilaurate to hexamethylene diisocyanate is controlled to be 5: 10: 0.01: 0.5, the weight ratio of depolymerized lignin to dimethylacetamide is 1: 20, and the weight ratio of the mixed solution to prepolymer is 1: 3-5;

step S2, adding a carbon nano tube into a three-neck flask, adding mixed acid and ultrasonically dispersing for 1h, controlling the ultrasonic power to be 50-60W, then heating in an oil bath at 50-60 ℃, condensing and refluxing for 3h, then washing with deionized water to be neutral, drying to prepare an acidified carbon nano tube, then adding the acidified carbon nano tube into toluene, introducing nitrogen, heating to 60-70 ℃, adding toluene diisocyanate and dibutyltin dilaurate, stirring and reacting for 10h, performing suction filtration, washing with toluene until toluene diisocyanate does not exist, preparing a filler, controlling the weight ratio of the carbon nano tube to the mixed acid to be 1: 50, and controlling the weight ratio of the acidified carbon nano tube to the toluene diisocyanate to be 1: 10: 0.1-0.15;

and step S3, adding the filler and the first elastomer into a vulcanizing machine according to the weight ratio of 1: 10, curing for 30min under the pressure of 10MPa, then demolding, and curing for 20h in a drying oven at 100 ℃ to obtain the composite elastomer.

4. A highly elastic composite material for a picosecond racket surface according to claim 3, wherein said depolymerised lignin is an alkaline depolymerised lignin.

5. The high elasticity composite material for a Racket surface as claimed in claim 3, wherein the mixed acid in the step S2 is formed by mixing 70% of sulfuric acid and 60% of nitric acid according to a volume ratio of 3: 1.

6. The process for preparing a high elasticity composite material for a pick pat surface according to claim 1, comprising the steps of:

adding the composite elastomer, the cross-linking agent, the catalyst and the styrene into a reaction kettle, stirring for 30min under the vacuum condition of-0.09 MPa, heating to 60-70 ℃, pouring into a mold, discharging bubbles for 2min under vacuum, transferring into a drying box at 90-100 ℃ for curing for 2h, demolding, adding into a vulcanizing machine, curing for 10h at 110-120 ℃ to obtain the high-elasticity composite material for the surface of the pick pat.