Anti-aging elastic composite rubber for table tennis bats and preparation method of anti-aging elastic composite rubber

Abstract

The invention discloses anti-aging elastic composite rubber for table tennis bats and a preparation method of the anti-aging elastic composite rubber, and belongs to the technical field of rubber materials. A surfactant, a silane coupling agent modified composite filler, a 1, 3-butadiene solution and acrylonitrile are mixed and stirred to form a mixed emulsion; mixing and catalyzing the mixed emulsion and an initiator to obtain a nitrile rubber prepolymer; mixing the nitrile rubber prepolymer, a vulcanizing agent and an accelerant to obtain a rubber compound, and vulcanizing the rubber compound to obtain the elastic composite rubber. The preparation method comprises the following steps: firstly, mixing the silane coupling agent modified composite filler, a 1, 3-butadiene solution and acrylonitrile to react to obtain a nitrile rubber prepolymer, and then carrying out mixing and vulcanization treatment to obtain the anti-aging elastic composite rubber with good mechanical properties.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber materials, and particularly relates to an anti-aging elastic composite rubber for a table tennis racket and a preparation method thereof. Background Art

[0002] A table tennis racket is a composite of rubber, sponge, and base bonded together with an adhesive. The rubber, as the racket's core component, comes into direct contact with the ball. Its material, structure, and properties determine key factors such as speed, spin, and control during impact. Therefore, the rubber must possess elasticity, appropriate hardness, and a certain degree of aging resistance. Rubber is a high-quality polymer material with high elasticity and viscoelasticity, widely used in the automotive, aerospace, construction, medical, food, and electronics industries. my country is a major global rubber producer, leading in both rubber consumption and rubber product production. Rubber materials are primarily categorized into natural rubber and synthetic rubber. Natural rubber is produced by extracting gum from plants such as rubber trees and rubber grass, and its primary component is cis-1,4-polyisoprene. Synthetic rubber is produced by the polymerization of various monomers and primarily includes fluororubber, styrene-butadiene rubber, ethylene-propylene rubber, and silicone rubber. Synthetic rubber, due to improvements in its composition and structure, exhibits excellent properties such as high-temperature resistance, aging resistance, and corrosion resistance. Rubber has good elasticity and has a promising application in the production of table tennis rubber. However, traditional natural rubber is difficult to achieve good performance without modification.

[0003] Nitrile-butadiene rubber (NBR) is a synthetic rubber obtained by copolymerizing butadiene and acrylonitrile, exhibiting excellent wear and heat resistance. However, due to the presence of a large number of unsaturated olefin segments in its molecular structure, NBR exhibits relatively poor aging resistance. Prior art attempts to improve the aging resistance of NBR have been made by introducing antioxidants. However, due to their low molecular weight and high volatility, conventional antioxidants tend to diffuse from the rubber matrix and migrate to the surface, particularly during processing or use, significantly reducing their antioxidant effectiveness.

[0004] Therefore, how to modify nitrile rubber so that it has good aging resistance when used in table tennis racket rubber is of great significance. Summary of the Invention

[0005] In response to the shortcomings of the prior art, the present invention first reacts a silane coupling agent-modified composite filler, a 1,3-butadiene solution, and acrylonitrile to produce a nitrile rubber prepolymer. This is then followed by mixing and vulcanization to produce an elastic composite rubber with excellent mechanical properties and aging resistance, thereby resolving the technical problems raised in the background art. Specifically, the present invention comprises the following technical solutions: One of the purposes of the present invention is to provide a method for preparing an anti-aging elastic composite rubber for table tennis rackets, the preparation method comprising the following steps: The surfactant, the silane coupling agent modified composite filler, the 1,3-butadiene solution and the acrylonitrile are mixed and stirred in a weight ratio of 0.01-0.03:0.4-0.5:5-9:2-4 to form a mixed emulsion; The mixed emulsion and the initiator are mixed in a weight ratio of 1:0.003-0.004 and catalyzed to obtain a nitrile rubber prepolymer; The nitrile rubber prepolymer, the vulcanizing agent and the accelerator are mixed in a weight ratio of 1-2:0.02-0.03:0.01-0.015 to obtain a rubber compound, and the rubber compound is vulcanized to obtain an elastic composite rubber.

[0006] Furthermore, the surfactant is composed of sodium dodecylbenzenesulfonate and AEO-10 ​​in a weight ratio of 0.5:1.

[0007] Furthermore, the preparation method of the silane coupling agent modified composite filler comprises the following steps: The inorganic filler, the antioxidant and the anhydrous acetone are mixed and dispersed in a weight ratio of 5:0.1-0.2:50-60 to obtain a dispersion; A silane coupling agent, anhydrous ethanol and deionized water are mixed in a weight ratio of 0.2-0.3:0.6-0.7:0.1, and heated to react to obtain a pretreated hydrolyzate; The dispersion liquid and the pretreated hydrolyzate are mixed and heated at a ratio of 1:0.8-0.9 to obtain a silane coupling agent modified composite filler.

[0008] Furthermore, the inorganic filler includes nano-silicon dioxide.

[0009] Furthermore, the particle size of the nano-silicon dioxide is 60 nm.

[0010] Furthermore, the antioxidant is a hindered phenol antioxidant, and the hindered phenol antioxidant includes antioxidant 1010 or antioxidant 1076.

[0011] Furthermore, the mixing and dispersing conditions include an ultrasonic power of 300W to 400W and a dispersing time of 15min to 20min.

[0012] Furthermore, the silane coupling agent includes vinyltrimethoxysilane or vinyltriethoxysilane.

[0013] Furthermore, the conditions for the mixed heating reaction of the silane coupling agent, anhydrous ethanol and deionized water include a temperature of 30° C. to 40° C., a pH of 4.5 to 5 and a heating time of 40 min to 50 min.

[0014] Furthermore, the conditions for mixing and heating the dispersion and the pretreated hydrolyzate include a temperature of 60° C. to 70° C. and a heating time of 4 h to 5 h.

[0015] Furthermore, the molar concentration of the 1,3-butadiene solution is 1 mol / L to 1.5 mol / L.

[0016] Furthermore, the conditions for mixing and stirring the surfactant, the silane coupling agent modified composite filler, the 1,3-butadiene solution and the acrylonitrile include a stirring speed of 800 r / min to 1000 r / min and a stirring time of 10 min to 15 min.

[0017] Furthermore, the initiator includes potassium persulfate.

[0018] Furthermore, the conditions for the mixed catalysis of the mixed emulsion and the initiator include a catalytic temperature of 30° C. to 35° C., a catalytic pressure of 2 MPa to 3 MPa, and a catalytic time of 7 h to 8 h.

[0019] Furthermore, the vulcanizing machine includes sulfur, and the accelerator includes dibenzothiazyl disulfide.

[0020] Furthermore, the mixing conditions include a mixing speed of 80 r / min, a mixing temperature of 60° C., and a mixing time of 10 min.

[0021] Furthermore, the vulcanization treatment conditions include a vulcanization temperature of 150° C., a vulcanization pressure of 13 MPa, and a vulcanization time of 15 min.

[0022] A second object of the present invention is to provide an anti-aging elastic composite rubber for table tennis rackets.

[0023] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses an inorganic filler with UV resistance and enhanced mechanical properties as one of the modified materials, and an antioxidant with antioxidant properties as another modified material. Silicon hydroxyl groups generated by hydrolysis of a silane coupling agent undergo condensation and cross-linking with hydroxyl groups on the surface of the inorganic filler and hydroxyl groups on the structure of the antioxidant to form a silicon-oxygen bond, and then the two are connected together by covalent bonds to form a silane coupling agent-modified composite filler. The composite filler has a carbon-carbon double bond of the silane coupling agent in its structure. Through this carbon-carbon double bond structure, a carbon-carbon double bond condensation copolymerization reaction occurs with 1,3-butadiene and acrylonitrile, basic raw materials for synthesizing nitrile rubber materials. Then, the inorganic filler and the antioxidant are indirectly introduced into the nitrile rubber prepolymer through chemical cross-linking, greatly reducing the adverse effects of the inorganic filler easily agglomerated due to its small particle size and thus affecting the mechanical properties of the rubber, and the antioxidant easily volatilized and resulting in a poor modification effect. The synergistic cooperation of the two modified materials ensures that the prepared elastic composite rubber not only has good anti-aging properties but also exhibits good mechanical properties. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions of the present invention through the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0026] Preparation Example 1: The preparation method of the silane coupling agent modified composite filler specifically includes the following steps: 5 parts by weight of nano-silica with a particle size of 60 nm, 0.1 parts by weight of antioxidant 1010 and 50 parts by weight of anhydrous acetone are weighed and added to a flask, and then the flask is placed in an ultrasonic disperser, the ultrasonic power is adjusted to 300 W, the dispersion treatment time is controlled to 15 minutes, and then the ultrasonic dispersion treatment is started to obtain a dispersion liquid for standby use; 0.2 parts by weight of vinyltrimethoxysilane, 0.6 parts by weight of anhydrous ethanol and 0.1 parts by weight of deionized water are weighed and added to a reaction bottle, and then the pH is adjusted to 4.5 with acetic acid, and the mixture is placed in a 30°C water bath, stirred at a speed of 200 r / min for hydrolysis reaction for 40 minutes, and after the hydrolysis is completed, the mixture is cooled to 20°C to obtain a pretreated hydrolyzate for standby use; 1 part by weight of the dispersion liquid and 0.8 parts by weight of the pretreated hydrolyzate are weighed and mixed, and then nitrogen is introduced for 5 minutes to exhaust the air, and then heated and stirred in a 60°C water bath at a speed of 100 r / min for reaction for 4 hours. After the reaction, the precipitate was collected by centrifugal filtration, washed with anhydrous ethanol, and then washed with deionized water until the pH value of the washing water was neutral, and then dried in a vacuum drying oven at 60° C. for 12 h to obtain a silane coupling agent modified composite filler.

[0027] Preparation Example 2: The preparation method of the silane coupling agent modified composite filler specifically includes the following steps: 5 parts by weight of nano-silica with a particle size of 60 nm, 0.15 parts by weight of antioxidant 1010 and 55 parts by weight of anhydrous acetone were weighed and added to a flask, and then the flask was placed in an ultrasonic disperser, the ultrasonic power was adjusted to 350 W, the dispersion treatment time was controlled to 18 minutes, and then the ultrasonic dispersion treatment was started to obtain a dispersion liquid for standby use; 0.25 parts by weight of vinyltrimethoxysilane, 0.65 parts by weight of anhydrous ethanol and 0.1 parts by weight of deionized water were weighed and added to a reaction flask, and then the pH was adjusted to 4.5 with acetic acid, and the mixture was placed in a 35°C water bath, stirred at a speed of 200 r / min for hydrolysis reaction for 45 minutes, and after the hydrolysis was completed, the mixture was cooled to 20°C to obtain a pretreated hydrolyzate for standby use; 1 part by weight of the dispersion liquid and 0.85 parts by weight of the pretreated hydrolyzate were weighed and mixed, and then nitrogen was introduced for 5 minutes to exhaust the air, and then heated and stirred in a 65°C water bath at a speed of 100 r / min for reaction for 4.5 hours. After the reaction, the precipitate was collected by centrifugal filtration, washed with anhydrous ethanol, and then washed with deionized water until the pH value of the washing water was neutral, and then dried in a vacuum drying oven at 60° C. for 12 h to obtain a silane coupling agent modified composite filler.

[0028] Preparation Example 3: The preparation method of the silane coupling agent modified composite filler specifically includes the following steps: 5 parts by weight of nano-silica with a particle size of 60 nm, 0.2 parts by weight of antioxidant 1076 and 60 parts by weight of anhydrous acetone are weighed and added to a flask, and then the flask is placed in an ultrasonic disperser, the ultrasonic power is adjusted to 400 W, the dispersion treatment time is controlled to 20 minutes, and then the ultrasonic dispersion treatment is started to obtain a dispersion liquid for standby use; 0.3 parts by weight of vinyltriethoxysilane, 0.7 parts by weight of anhydrous ethanol and 0.1 parts by weight of deionized water are weighed and added to a reaction bottle, and then the pH is adjusted to 5 with acetic acid, and the bottle is placed in a 40°C water bath, stirred at a speed of 200 r / min for hydrolysis reaction for 50 minutes, and after the hydrolysis is completed, the bottle is cooled to 20°C to obtain a pretreated hydrolyzate for standby use; 1 part by weight of the dispersion liquid and 0.9 parts by weight of the pretreated hydrolyzate are weighed and mixed, and then nitrogen is introduced for 5 minutes to exhaust the air, and then heated and stirred at a speed of 100 r / min in a 70°C water bath for reaction for 5 hours. After the reaction, the precipitate was collected by centrifugal filtration, washed with anhydrous ethanol, and then washed with deionized water until the pH value of the washing water was neutral, and then dried in a vacuum drying oven at 60° C. for 12 h to obtain a silane coupling agent modified composite filler.

[0029] Preparation Example 4: The preparation method of the silane coupling agent modified composite filler specifically includes the following steps: The nano-silica with a particle size of 60 nm in Preparation Example 3 was replaced with nano-silica with a particle size of 30 nm, and the rest of the preparation process remained the same as Preparation Example 3.

[0030] Preparation Example 5: The preparation method of the silane coupling agent modified composite filler specifically includes the following steps: The antioxidant 1076 in Preparation Example 3 was replaced by antioxidant 168, and the rest of the preparation process remained the same as Preparation Example 3.

[0031] Preparation Example 6: The preparation method of the silane coupling agent modified composite filler specifically includes the following steps: 5 parts by weight of nano-silica with a particle size of 60 nm, 0.2 parts by weight of antioxidant 1076 and 60 parts by weight of anhydrous acetone are weighed and added to a flask, and then the flask is placed in an ultrasonic disperser, the ultrasonic power is adjusted to 400 W, the dispersion treatment time is controlled to 20 minutes, and then the ultrasonic dispersion treatment is started to obtain a dispersion liquid for standby use; 0.3 parts by weight of vinyltriethoxysilane, 0.7 parts by weight of anhydrous ethanol and 0.1 parts by weight of deionized water are weighed and added to a reaction flask, and then the pH is adjusted to 5 with acetic acid, and the flask is placed in a 40°C water bath, stirred at a speed of 200 r / min for hydrolysis reaction for 20 minutes, and after the hydrolysis is completed, the flask is cooled to 20°C to obtain a pretreated hydrolyzate for standby use; 1 part by weight of the dispersion liquid and 0.9 parts by weight of the pretreated hydrolyzate are weighed and mixed, and then nitrogen is introduced for 5 minutes to exhaust the air, and then heated and stirred in a 70°C water bath at a speed of 100 r / min for reaction for 5 hours. After the reaction, the precipitate was collected by centrifugal filtration, washed with anhydrous ethanol, and then washed with deionized water until the pH value of the washing water was neutral, and then dried in a vacuum drying oven at 60° C. for 12 h to obtain a silane coupling agent modified composite filler.

[0032] Preparation Example 7: The preparation method of the silane coupling agent modified composite filler specifically includes the following steps: 5 parts by weight of nano-silica with a particle size of 60 nm, 0.2 parts by weight of antioxidant 1076 and 60 parts by weight of anhydrous acetone are weighed and added to a flask, and then the flask is placed in an ultrasonic disperser, the ultrasonic power is adjusted to 400 W, the dispersion treatment time is controlled to 70 minutes, and then the ultrasonic dispersion treatment is started to obtain a dispersion liquid for standby use; 0.3 parts by weight of vinyltriethoxysilane, 0.7 parts by weight of anhydrous ethanol and 0.1 parts by weight of deionized water are weighed and added to a reaction flask, and then the pH is adjusted to 5 with acetic acid, and the flask is placed in a 40°C water bath, stirred at a speed of 200 r / min for hydrolysis reaction for 20 minutes, and after the hydrolysis is completed, the flask is cooled to 20°C to obtain a pretreated hydrolyzate for standby use; 1 part by weight of the dispersion liquid and 0.9 parts by weight of the pretreated hydrolyzate are weighed and mixed, and then nitrogen is introduced for 5 minutes to exhaust the air, and then heated and stirred in a 70°C water bath at a speed of 100 r / min for reaction for 5 hours. After the reaction, the precipitate was collected by centrifugal filtration, washed with anhydrous ethanol, and then washed with deionized water until the pH value of the washing water was neutral, and then dried in a vacuum drying oven at 60° C. for 12 h to obtain a silane coupling agent modified composite filler.

[0033] Example 1: A method for preparing an anti-aging elastic composite rubber for a table tennis racket, specifically comprising the following steps: Weigh 5 parts by weight of 1,3-butadiene solution (molar concentration of 1 mol / L) and 2 parts by weight of acrylonitrile, then add 0.01 parts by weight of surfactant (composed of 0.5 parts by weight of sodium dodecylbenzenesulfonate and 1 part by weight of AE0-15) and 0.4 parts by weight of the silane coupling agent modified composite filler obtained in Preparation Example 1, and then stir and disperse in a high-speed disperser at a speed of 800 r / min for 10 minutes to obtain a mixed emulsion; weigh 0.003 times the weight of the mixed emulsion of potassium persulfate and add it together with the mixed emulsion to The mixture is mixed and stirred uniformly in a reactor, and then nitrogen is introduced to completely expel the air. The reactor is then closed and nitrogen is continued to be introduced until the pressure in the reactor reaches 2 MPa. The reactor temperature is then controlled at 30°C and the catalytic reaction is carried out for 7 hours. After the reaction is completed, the mixture is taken out and dried in a vacuum drying oven at 60°C to obtain a nitrile rubber prepolymer. 1 part by weight of the nitrile rubber prepolymer, 0.02 parts by weight of sulfur, and 0.01 part by weight of dibenzothiazole disulfide are weighed and added to an open mill preheated to 60°C. The speed of the open mill is adjusted to 80 r / min, and the mixture is then mixed for 10 minutes. The mixed rubber is allowed to stand for 24 hours, poured into a flat vulcanizer, and vulcanized at a vulcanization temperature of 150°C and a vulcanization pressure of 13 MPa for 15 minutes. Finally, the mixture is naturally cooled to room temperature to obtain an elastic composite rubber.

[0034] Example 2: A method for preparing an anti-aging elastic composite rubber for a table tennis racket, specifically comprising the following steps: Weigh 7 parts by weight of 1,3-butadiene solution (molar concentration of 1.2 mol / L) and 3 parts by weight of acrylonitrile, and then add 0.02 parts by weight of surfactant (composed of 0.5 parts by weight of sodium dodecylbenzenesulfonate and 1 part by weight of AE0-15) and 0.45 parts by weight of the silane coupling agent modified composite filler obtained in Preparation Example 2. Then, in a high-speed disperser, stir and disperse at a speed of 900 r / min for 12 minutes to obtain a mixed emulsion; weigh 0.003 times the weight of the mixed emulsion of potassium persulfate and add it together with the mixed emulsion to the reaction mixture. The mixture is mixed and stirred uniformly in the kettle, and then nitrogen is introduced to completely expel the air. The reactor is then closed and nitrogen is continued to be introduced until the pressure in the reactor reaches 2 MPa. The reactor temperature is then controlled at 30°C and the catalytic reaction is carried out for 7.5 hours. After the reaction is completed, the mixture is taken out and dried in a vacuum drying oven at 60°C to obtain a nitrile rubber prepolymer. 1.5 parts by weight of the nitrile rubber prepolymer, 0.025 parts by weight of sulfur, and 0.01 parts by weight of dibenzothiazyl disulfide are weighed and added to an open mill preheated to 60°C. The speed of the open mill is adjusted to 80 r / min, and the mixture is then mixed for 10 minutes. The mixed rubber is allowed to stand for 24 hours, poured into a flat vulcanizer, and vulcanized at a vulcanization temperature of 150°C and a vulcanization pressure of 13 MPa for 15 minutes. Finally, the mixture is naturally cooled to room temperature to obtain an elastic composite rubber.

[0035] Example 3 A preparation method of an anti-aging elastic composite rubber for table tennis bats, specifically comprising the following processes: Take 9 parts by weight of 1,3-butadiene solution (molar concentration of 1.5 mol / L) and 4 parts by weight of acrylonitrile, then add 0.03 parts by weight of surfactant (composed of 0.5 parts by weight of sodium dodecyl benzene sulfonate and 1 part by weight of AE0-15) and 0.5 parts by weight of silane coupling agent modified composite filler obtained from Preparation Example 3, then mix and stir to disperse in a high-speed dispersing machine at a speed of 1000 r / min for 15 min to obtain a mixed emulsion; take 0.004 times the weight of the mixed emulsion of potassium persulfate and mix with the mixed emulsion in the reaction kettle, then mix and stir uniformly, then pass nitrogen to completely remove air, then close the reaction kettle and continue to pass nitrogen to make the pressure in the kettle reach 3 MPa, then control the temperature of the reaction kettle at 35℃, and catalyze for 8 h, then take out and dry in a vacuum drying oven at 60℃ to obtain a butadiene-acrylonitrile rubber prepolymer; take 2 parts by weight of butadiene-acrylonitrile rubber prepolymer, 0.03 parts by weight of sulfur and 0.015 parts by weight of dibenzothiazyl disulfide into an open mill preheated to 60℃, adjust the speed of the open mill to 80 r / min, then mix and process for 10 min. After the mixed rubber obtained by mixing is placed for 24 h, pour it into a flat plate vulcanizer, vulcanize at a temperature of 150℃ and a pressure of 13 MPa for 15 min, and finally naturally cool to room temperature to obtain an elastic composite rubber.

[0036] Comparative Example 1 A preparation method of an anti-aging elastic composite rubber for table tennis bats, specifically comprising the following processes: Replace the silane coupling agent modified composite filler in Example 3 with the silane coupling agent modified composite filler obtained from Preparation Example 4, and the rest of the preparation process remains the same as Example 3.

[0037] Comparative Example 2 A preparation method of an anti-aging elastic composite rubber for table tennis bats, specifically comprising the following processes: Replace the silane coupling agent modified composite filler in Example 3 with the silane coupling agent modified composite filler obtained from Preparation Example 5, and the rest of the preparation process remains the same as Example 3.

[0038] Comparative Example 3 A preparation method of an anti-aging elastic composite rubber for table tennis bats, specifically comprising the following processes: Replace the silane coupling agent modified composite filler in Example 3 with the silane coupling agent modified composite filler obtained from Preparation Example 6, and the rest of the preparation process remains the same as Example 3.

[0039] Comparative Example 4: A method for preparing an anti-aging elastic composite rubber for a table tennis racket, specifically comprising the following steps: The silane coupling agent modified composite filler in Example 3 was replaced by the silane coupling agent modified composite filler obtained in Preparation Example 7, and the rest of the preparation process was consistent with Example 3.

[0040] Comparative Example 5: A method for preparing an anti-aging elastic composite rubber for a table tennis racket, specifically comprising the following steps: 2 parts by weight of nitrile rubber NBR3306G, 0.5 parts by weight of the silane coupling agent-modified composite filler obtained in Preparation Example 3, 0.03 parts by weight of sulfur, and 0.015 parts of dibenzothiazole disulfide were added to an open mill preheated to 60°C. The speed of the open mill was adjusted to 80 r / min, and then mixed for 10 minutes. The mixed rubber was allowed to stand for 24 hours, then poured into a flat vulcanizer and vulcanized at a vulcanization temperature of 150°C and a vulcanization pressure of 13 MPa for 15 minutes. Finally, it was naturally cooled to room temperature to obtain an elastic composite rubber.

[0041] The elastic composite rubbers obtained in Examples 1 to 3 and Comparative Examples 1 to 5 were prepared into samples of 50 mm × 50 mm × 4 mm, and then subjected to tensile strength tests using an electronic universal tensile testing machine at a tensile rate of 500 mm / min. The results are shown in Table 1 below.

[0042] Table 1 Mechanical properties The elastic composite rubbers obtained in Examples 1 to 3 and Comparative Examples 1 to 5 were subjected to a thermal oxidation aging test in accordance with GB / T 3512-2014 Vulcanized rubber or thermoplastic rubber - Hot air accelerated aging and heat resistance test, with an aging temperature of 100°C and an aging time of 90 h. The tensile strength test was then performed using an electronic universal tensile testing machine at a tensile rate of 500 mm / min. The results are shown in Table 2 below.

[0043] Table 2 Aging resistance mechanical properties The following conclusions can be drawn from the test results in Tables 1 and 2 above: (1) It can be found from Examples 1 to 3 that the elastic composite rubber prepared by the present invention has good anti-aging and mechanical properties.

[0044] (2) It can be found from Comparative Example 1 that the mechanical properties and anti-aging properties of the prepared elastic composite rubber are relatively poor. This may be because the particle size of the nano-silica is too small. The preparation method of this system may not be able to effectively modify the surface of the nano-silica, affecting the preparation of the silane coupling agent modified composite filler, and thus making the performance of the elastic composite rubber finally prepared poor.

[0045] (3) It can be found from Comparative Example 2 that the mechanical properties and anti-aging properties of the prepared elastic composite rubber are relatively poor. This may be because the antioxidant 168 does not have a hydroxyl functional group in its structure, resulting in the inability to form a siloxane bond with the silanol produced by the hydrolysis of the silane coupling agent. The antioxidant 168 is then unable to form a connection with the nano-silica. Relying solely on nano-silica, the performance of the elastic composite rubber finally prepared is poor.

[0046] (4) It can be found from Comparative Examples 3 and 4 that the mechanical properties and anti-aging properties of the prepared elastic composite rubber are relatively poor. This may be because in this system, it is necessary to rely on the hydrolysis of the silane coupling agent to produce silanol groups to achieve the modification of nano-silica and antioxidant 1076. However, if the hydrolysis time of the silane coupling agent is too short, the silanol groups produced by hydrolysis may be less, resulting in the poor effect of the prepared elastic composite rubber. If the hydrolysis time is too long, the silane coupling agent is easy to self-polymerize, and it is difficult to achieve the modification of nano-silica and antioxidant 1076, resulting in the poor performance of the elastic composite rubber finally prepared.

[0047] (5) It can be found from Comparative Example 5 that the mechanical properties and anti-aging properties of the prepared elastic composite rubber are relatively poor. This may be because in this system, if the prepared silane coupling agent modified composite filler is directly mixed with nitrile rubber for refining and vulcanization, the direct mixing modification effect may be poor due to poor compatibility with nitrile rubber, which in turn makes the performance of the elastic composite rubber finally prepared poor.

[0048] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A method for preparing an anti-aging elastic composite rubber for table tennis rackets, characterized in that: The preparation method comprises the following steps: The surfactant, the silane coupling agent modified composite filler, the 1,3-butadiene solution and the acrylonitrile are mixed and stirred in a weight ratio of 0.01-0.03:0.4-0.5:5-9:2-4 to form a mixed emulsion; The mixed emulsion and the initiator are mixed in a weight ratio of 1:0.003-0.004 and catalyzed to obtain a nitrile rubber prepolymer; The nitrile rubber prepolymer, the vulcanizing agent and the accelerator are mixed in a weight ratio of 1-2:0.02-0.03:0.01-0.015 to obtain a rubber compound, and the rubber compound is vulcanized to obtain an elastic composite rubber.

2. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 1, characterized in that: The surfactant is composed of sodium dodecylbenzenesulfonate and AEO-10 ​​in a weight ratio of 0.5:

1.

3. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 1, characterized in that: The preparation method of the silane coupling agent modified composite filler comprises the following steps: The inorganic filler, the antioxidant and the anhydrous acetone are mixed and dispersed in a weight ratio of 5:0.1-0.2:50-60 to obtain a dispersion; A silane coupling agent, anhydrous ethanol and deionized water are mixed in a weight ratio of 0.2-0.3:0.6-0.7:0.1, and heated to react to obtain a pretreated hydrolyzate; The dispersion liquid and the pretreated hydrolyzate are mixed and heated at a ratio of 1:0.8-0.9 to obtain a silane coupling agent modified composite filler.

4. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 3, characterized in that: The inorganic filler includes nano-silicon dioxide.

5. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 3, characterized in that: The silane coupling agent includes vinyltrimethoxysilane or vinyltriethoxysilane.

6. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 3, characterized in that: The conditions for the mixed heating reaction of the silane coupling agent, anhydrous ethanol and deionized water include a temperature of 30° C. to 40° C., a pH of 4.5 to 5 and a heating time of 40 min to 50 min.

7. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 3, characterized in that: The conditions for mixing and heating the dispersion and the pre-treated hydrolyzate include a temperature of 60° C. to 70° C. and a heating time of 4 h to 5 h.

8. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 1, characterized in that: The conditions for the mixed catalysis of the mixed emulsion and the initiator include a catalytic temperature of 30° C. to 35° C., a catalytic pressure of 2 MPa to 3 MPa, and a catalytic time of 7 h to 8 h.

9. The method for preparing an anti-aging elastic composite rubber for table tennis rackets according to claim 1, characterized in that: The vulcanization treatment conditions include a vulcanization temperature of 150° C., a vulcanization pressure of 13 MPa, and a vulcanization time of 15 min.

10. An anti-aging elastic composite rubber for table tennis rackets, characterized in that: The elastic composite rubber is prepared by the method for preparing an anti-aging elastic composite rubber for table tennis rackets according to any one of claims 1 to 9.

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