Short fiber reinforced EPDM (ethylene-propylene-diene monomer) sheet and preparation process thereof

Abstract

The invention belongs to the technical field of materials, particularly relates to a short fiber reinforced EPDM (ethylene-propylene-diene monomer) sheet and a preparation process thereof, and provides the following scheme aiming at the problems of limited tensile property and low tearing strength in the prior art. Comprising the following components in parts by weight: 40-50 parts of ethylene propylene diene monomer, 10-15 parts of modified polyacrylate, 5-10 parts of crayfish shell powder, 15-25 parts of modified reinforced fibers, 5-10 parts of soybean protein and 5-10 parts of an additive, the raw materials of the modified reinforced fibers comprise modified polyamide fibers, polypropylene reticular fibers, aramid nanofibers, graphene oxide and polyether ketone, the solvent is dimethylformamide, the tensile property of the short fiber reinforced EPDM sheet produced from the raw materials is greatly improved, the indexes such as tensile strength, tensile modulus and elongation at break are increased, and the tensile strength of the short fiber reinforced EPDM sheet is improved. And the capability of resisting tearing damage is high.

Description

Technical Field

[0001] The invention relates to the technical field of materials, and in particular to a short fiber reinforced EPDM sheet and a preparation process thereof. Background Art

[0002] The Chinese patent document with application number 202311747544.X discloses an insulating EPDM sheet and a preparation method thereof, including a body and an EPDM sheet layer, wherein the bottom end of the body is provided with an EPDM sheet layer, and the top is provided with a crusting layer, the top of the crusting layer is adhered with an adhesive layer, and the surface of the adhesive layer is provided with an anti-adhesive film. The present invention uses EPDM as the main component when the raw materials are mixed, and the EPDM itself has excellent electrical insulation, and zinc oxide is also added during mixing, and zinc oxide can effectively improve the insulation performance of EPDM, so that the electrical insulation of the insulating EPDM sheet is enhanced, and zinc oxide can also stabilize the vulcanization system, improve the heat resistance and moisture resistance of the insulating material, and a small amount of sulfur is added during the vulcanization treatment, and the hardness of the insulating EPDM sheet is stronger, and the tear strength is improved, thereby extending the service life of the insulating EPDM sheet, making it more resistant to aging, and improving electrical insulation.

[0003] However, the insulating EPDM sheet and its preparation method also have some problems. For example, the tensile properties of the EPDM sheet are limited, the tensile strength, tensile modulus and elongation at break are poor, and the tear strength of the EPDM sheet is not strong, and the ability to resist tearing damage is low. Summary of the invention

[0004] Based on the problems that the background technology has limited tensile properties and low tear strength, the present invention proposes a short fiber reinforced EPDM sheet and a preparation process thereof.

[0005] The short fiber reinforced EPDM sheet provided by the present invention comprises the following components in weight proportions: 40 to 50 parts of ethylene propylene diene monomer rubber, 10 to 15 parts of modified polyacrylate, 5 to 10 parts of crayfish shell powder, 15 to 25 parts of modified reinforcing fiber, 5 to 10 parts of soy protein and 5 to 10 parts of additives, wherein the raw materials of the modified reinforcing fiber include modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone, and the solvent is dimethylformamide. The short fiber reinforced EPDM sheet produced from raw materials such as ethylene propylene diene monomer rubber, modified polyacrylate, crayfish shell powder, modified reinforcing fiber, soy protein and additives has greatly improved tensile properties, increased tensile strength, tensile modulus, elongation at break and other indicators, and has a strong ability to resist tearing damage.

[0006] Preferably, the preparation method of the modified polyacrylate comprises: preparing materials of polyacrylate, tetrahydrofuran, azobisisobutyronitrile, fatty amine and sodium hydride, pouring the polyacrylate, tetrahydrofuran and azobisisobutyronitrile into a reaction kettle, controlling the stirring speed at 600 rpm to 720 rpm per minute, controlling the stirring temperature at 45° C. to 60° C., stirring for 30 minutes to 45 minutes to obtain a polyacrylate solution, uniformly dispersing the fatty amine and sodium hydride in the polyacrylate solution, mixing and reacting for 1 hour to 3 hours at a temperature of 20° C. to 25° C. to obtain a modified polyacrylate solution, pouring the modified polyacrylate solution into a drying device for drying, and obtaining the modified polyacrylate in powder form, which can enhance the connectivity of the material.

[0007] Preferably, the preparation method of the crayfish shell powder is as follows: first collect the crayfish shells, clean and dry them, and then put them into a high-temperature sterilization equipment for high-temperature disinfection and sterilization. After disinfection and sterilization, the crayfish shells are crushed and ground to obtain crayfish shell raw powder, titanate coupling agent and epoxy resin are poured into deionized water, heated to dissolve and then added to the crayfish shell raw powder, the stirring speed is controlled at 600rpm to 720rpm per minute, and the stirring treatment is carried out for 30 minutes to 45 minutes, and then dried and ground to obtain crayfish shell powder. The material of crayfish shell powder can enhance the compatibility with other materials.

[0008] Preferably, the weight ratio of modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone in the modified reinforcing fiber raw material is controlled at 3:3:2:1:1, and the weight ratio of dimethylformamide is 5 to 10 times that of the modified reinforcing fiber raw material, which can effectively enhance the performance of the material.

[0009] Preferably, the preparation method of the modified polyamide fiber is as follows: obtain polyamide fiber, clean it and set it aside for storage, mix concentrated hydrochloric acid and deionized water evenly, add them into a reactor, and pour the polyamide fiber into it, control the stirring speed at 300rpm to 420rpm per minute, control the stirring temperature at 35°C to 45°C, stir for 15 minutes to 45 minutes, filter after the reaction is completed, pour out the filtrate, wash and dry to obtain the modified polyamide fiber, which has good performance and can enhance the mechanical strength of the material.

[0010] Preferably, the preparation method of the modified reinforced fiber is as follows: modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone are obtained in proportion, graphene oxide and polyether ketone are added to dimethylformamide, and stirred and mixed at high speed until they are evenly mixed to obtain a treatment liquid, and then the modified polyamide fiber, polypropylene mesh fiber and aramid nanofiber are respectively poured into the treatment liquid, first stirred and treated at a speed of 600 rpm to 720 rpm per minute for 15 minutes to 30 minutes, and then ultrasonic treatment is started for 15 minutes to obtain the modified reinforced fiber.

[0011] Preferably, the additives include zinc oxide, sulfur and carbon black, the weight ratio of zinc oxide, sulfur and carbon black is controlled at 1:2:2, and the soy protein is a powder material, which can ensure the performance of the material.

[0012] A preparation process of a short fiber reinforced EPDM sheet comprises the following steps:

[0013] S1: heating and melting EPDM rubber and modified polyacrylate and mixing them to obtain a mixture;

[0014] S2: Then, crayfish shell powder and modified reinforcing fiber are added into the mixture, and the mixture is continuously mixed and stirred to obtain an EPDM sheet material;

[0015] S3: adding soybean protein and additives into the interior of the EPDM sheet material, and continuing the mixing reaction to obtain a semi-finished EPDM sheet material;

[0016] S4: pour the semi-finished EPDM sheet into a mold for extrusion molding, and finally perform a vulcanization reaction. After cooling, remove the excess part to obtain a short fiber reinforced EPDM sheet.

[0017] Preferably, in S2, the mixing speed is controlled at 120 rpm / min to 180 rpm / min, and the stirring time is controlled at 15 minutes to 30 minutes, so that the mixing efficiency is high.

[0018] Preferably, in S3, the mixing speed is controlled at 240 rpm / min to 320 rpm / min, and the stirring time is controlled at 5 minutes to 15 minutes to enhance the mixing effect.

[0019] Beneficial effects of the present invention:

[0020] The short fiber reinforced EPDM sheet produced from raw materials such as EPDM rubber, modified polyacrylate, crayfish shell powder, modified reinforcing fiber, soy protein and additives has greatly improved its tensile properties, and its tensile strength, tensile modulus, elongation at break and other indicators have increased, and its ability to resist tearing damage is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The working flow chart proposed by the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further explained below in conjunction with specific embodiments.

[0023] Reference Figure 1 , Embodiment 1

[0024] In this embodiment, a short fiber reinforced EPDM sheet is proposed, which includes the following components in the following proportions by weight: 42 parts of ethylene propylene diene monomer rubber, 13 parts of modified polyacrylate, 9 parts of crayfish shell powder, 21 parts of modified reinforcing fiber, 7 parts of soy protein and 8 parts of additives. The raw materials of the modified reinforcing fiber include modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone. The solvent is dimethylformamide. The preparation method of the modified polyacrylate is as follows: prepare materials polyacrylate, tetrahydrofuran, azobisisobutyronitrile, fatty amine and sodium hydride, pour the polyacrylate, tetrahydrofuran and azobisisobutyronitrile into a reactor, and control the stirring speed at 660 rp per minute. m, the stirring temperature is controlled at 50°C, and the stirring treatment is carried out for 41 minutes to obtain a polyacrylate solution, and the fatty amine and sodium hydride are evenly dispersed in the polyacrylate solution. At a temperature of 23°C, the mixture is reacted for 2 hours to obtain a modified polyacrylate solution, and the modified polyacrylate solution is poured into a drying device for drying, and the powder is obtained to obtain a modified polyacrylate. The preparation method of crayfish shell powder is as follows: first, the crayfish shells are collected, cleaned and dried, and then placed in a high-temperature sterilization device for high-temperature disinfection and sterilization. After disinfection and sterilization, the crayfish shells are crushed and ground to obtain crayfish shell raw powder, and titanate coupling agent and epoxy resin are poured into deionized water, heated to dissolve, and then the crayfish shell raw powder is added, and the stirring speed is 0.05. The speed is controlled at 670 rpm per minute, and the stirring process is carried out for 39 minutes, and then dried and ground to obtain crayfish shell powder. The weight proportion of modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone in the modified reinforcing fiber raw material is controlled at 3:3:2:1:1, and the weight proportion of dimethylformamide is 7 times that of the modified reinforcing fiber raw material. The preparation method of modified polyamide fiber is as follows: obtain polyamide fiber, clean it and put it aside for storage, mix concentrated hydrochloric acid and deionized water evenly, add them into the reactor, and pour the polyamide fiber, control the stirring speed at 370 rpm per minute, control the stirring temperature at 41°C, stir for 35 minutes, filter after the reaction, and pour the filtrate into The modified polyamide fiber is removed, washed and dried to obtain a modified polyamide fiber. The preparation method of the modified reinforced fiber is as follows: modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone are obtained in proportion, graphene oxide and polyether ketone are added to dimethylformamide, and stirred at high speed until they are evenly mixed to obtain a treatment liquid, and then the modified polyamide fiber, polypropylene mesh fiber and aramid nanofiber are poured into the treatment liquid respectively, first stirred at a speed of 670 rpm for 20 minutes, and then ultrasonic treatment is started for 15 minutes to obtain the modified reinforced fiber, the additives include zinc oxide, sulfur and carbon black, the weight proportions of zinc oxide, sulfur and carbon black are controlled at 1:2:2, and soy protein is a powder material.

[0025] A preparation process of a short fiber reinforced EPDM sheet comprises the following steps:

[0026] S1: heating and melting EPDM rubber and modified polyacrylate and mixing them to obtain a mixture;

[0027] S2: Then, crayfish shell powder and modified reinforcing fiber are added into the mixture, and the mixture is continuously mixed and stirred to obtain an EPDM sheet material, wherein the mixing speed is controlled at 150 rpm / min and the stirring time is controlled at 122 minutes;

[0028] S3: adding soybean protein and additives into the interior of the EPDM sheet material, continuing the mixing reaction, and obtaining the EPDM sheet semi-finished product, the mixing speed is controlled at 320 rpm / min, and the stirring time is controlled at 5 minutes;

[0029] S4: pour the semi-finished EPDM sheet into a mold for extrusion molding, and finally perform a vulcanization reaction. After cooling, remove the excess part to obtain a short fiber reinforced EPDM sheet.

[0030] Reference Figure 1 , Embodiment 2

[0031] In this embodiment, a short fiber reinforced EPDM sheet is proposed, which includes the following components in weight ratio: 44 parts of ethylene propylene diene monomer rubber, 11 parts of modified polyacrylate, 10 parts of crayfish shell powder, 20 parts of modified reinforcing fiber, 8 parts of soy protein and 7 parts of additives. The raw materials of the modified reinforcing fiber include modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone. The solvent is dimethylformamide. The preparation method of the modified polyacrylate is as follows: prepare materials polyacrylate, tetrahydrofuran, azobisisobutyronitrile, fatty amine and sodium hydride, pour the polyacrylate, tetrahydrofuran and azobisisobutyronitrile into a reactor, and control the stirring speed at 660r / min. pm, the stirring temperature is controlled at 50°C, and the stirring treatment is carried out for 41 minutes to obtain a polyacrylate solution, and the fatty amine and sodium hydride are evenly dispersed in the polyacrylate solution. At a temperature of 23°C, the mixture is mixed and reacted for 2 hours to obtain a modified polyacrylate solution, and the modified polyacrylate solution is poured into a drying device for drying, and the powder is obtained to obtain a modified polyacrylate. The preparation method of crayfish shell powder is as follows: first, the crayfish shells are collected, cleaned and dried, and then placed in a high-temperature sterilization device for high-temperature disinfection and sterilization. After disinfection and sterilization, the crayfish shells are crushed and ground to obtain crayfish shell raw powder, and titanate coupling agent and epoxy resin are poured into deionized water, heated to dissolve, and then the crayfish shell raw powder is added, and stirred. The speed is controlled at 670 rpm per minute, and the stirring process is carried out for 39 minutes. The crayfish shell powder is then dried and ground to obtain the crayfish shell powder. The weight ratio of modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone in the modified reinforcing fiber raw material is controlled at 3:3:2:1:1. The weight of dimethylformamide is 7 times that of the modified reinforcing fiber raw material. The preparation method of modified polyamide fiber is as follows: obtain polyamide fiber, clean it and set it aside for storage, mix concentrated hydrochloric acid and deionized water evenly, add them to the reactor, and pour the polyamide fiber, control the stirring speed at 370 rpm per minute, control the stirring temperature at 41°C, stir for 35 minutes, filter after the reaction is completed, and take the filtrate Pour it out, wash and dry it to obtain modified polyamide fiber. The preparation method of modified reinforced fiber: obtain modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone according to the proportion, add graphene oxide and polyether ketone to dimethylformamide, stir and mix at high speed until mixed evenly to obtain a treatment liquid, and then pour the modified polyamide fiber, polypropylene mesh fiber and aramid nanofiber into the treatment liquid respectively, first stir and treat at a speed of 670 rpm for 20 minutes, and then start ultrasonic treatment for 15 minutes to obtain modified reinforced fiber, the additives include zinc oxide, sulfur and carbon black, the weight proportions of zinc oxide, sulfur and carbon black are controlled at 1:2:2, and soy protein is a powder material.

[0032] A preparation process of a short fiber reinforced EPDM sheet comprises the following steps:

[0033] S1: heating and melting EPDM rubber and modified polyacrylate and mixing them to obtain a mixture;

[0034] S2: Then, crayfish shell powder and modified reinforcing fiber are added into the mixture, and the mixture is continuously mixed and stirred to obtain an EPDM sheet material, wherein the mixing speed is controlled at 150 rpm / min and the stirring time is controlled at 122 minutes;

[0035] S3: adding soybean protein and additives into the interior of the EPDM sheet material, continuing the mixing reaction, and obtaining the EPDM sheet semi-finished product, the mixing speed is controlled at 320 rpm / min, and the stirring time is controlled at 5 minutes;

[0036] S4: pour the semi-finished EPDM sheet into a mold for extrusion molding, and finally perform a vulcanization reaction. After cooling, remove the excess part to obtain a short fiber reinforced EPDM sheet.

[0037] Reference Figure 1 , Embodiment 3

[0038] In this embodiment, a short fiber reinforced EPDM sheet is proposed, which includes the following components in the following proportions by weight: 42 parts of ethylene propylene diene monomer rubber, 15 parts of modified polyacrylate, 8 parts of crayfish shell powder, 22 parts of modified reinforcing fiber, 7 parts of soy protein and 6 parts of additives. The raw materials of the modified reinforcing fiber include modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone. The solvent is dimethylformamide. The preparation method of the modified polyacrylate is as follows: prepare materials polyacrylate, tetrahydrofuran, azobisisobutyronitrile, fatty amine and sodium hydride, pour the polyacrylate, tetrahydrofuran and azobisisobutyronitrile into a reactor, and control the stirring speed at 660 rp per minute. m, the stirring temperature is controlled at 50°C, and the stirring treatment is carried out for 41 minutes to obtain a polyacrylate solution, and the fatty amine and sodium hydride are evenly dispersed in the polyacrylate solution. At a temperature of 23°C, the mixture is reacted for 2 hours to obtain a modified polyacrylate solution, and the modified polyacrylate solution is poured into a drying device for drying, and the powder is obtained to obtain a modified polyacrylate. The preparation method of crayfish shell powder is as follows: first, the crayfish shells are collected, cleaned and dried, and then placed in a high-temperature sterilization device for high-temperature disinfection and sterilization. After disinfection and sterilization, the crayfish shells are crushed and ground to obtain crayfish shell raw powder, and titanate coupling agent and epoxy resin are poured into deionized water, heated to dissolve, and then the crayfish shell raw powder is added, and the stirring speed is 0.05. The speed is controlled at 670 rpm per minute, and the stirring process is carried out for 39 minutes, and then dried and ground to obtain crayfish shell powder. The weight proportion of modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone in the modified reinforcing fiber raw material is controlled at 3:3:2:1:1, and the weight proportion of dimethylformamide is 7 times that of the modified reinforcing fiber raw material. The preparation method of modified polyamide fiber is as follows: obtain polyamide fiber, clean it and put it aside for storage, mix concentrated hydrochloric acid and deionized water evenly, add them into the reactor, and pour the polyamide fiber, control the stirring speed at 370 rpm per minute, control the stirring temperature at 41°C, stir for 35 minutes, filter after the reaction, and pour the filtrate into The modified polyamide fiber is removed, washed and dried to obtain a modified polyamide fiber. The preparation method of the modified reinforced fiber is as follows: modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone are obtained in proportion, graphene oxide and polyether ketone are added to dimethylformamide, and stirred at high speed until they are evenly mixed to obtain a treatment liquid, and then the modified polyamide fiber, polypropylene mesh fiber and aramid nanofiber are poured into the treatment liquid respectively, first stirred at a speed of 670 rpm for 20 minutes, and then ultrasonic treatment is started for 15 minutes to obtain the modified reinforced fiber, the additives include zinc oxide, sulfur and carbon black, the weight proportions of zinc oxide, sulfur and carbon black are controlled at 1:2:2, and soy protein is a powder material.

[0039] A preparation process of a short fiber reinforced EPDM sheet comprises the following steps:

[0040] S1: heating and melting EPDM rubber and modified polyacrylate and mixing them to obtain a mixture;

[0041] S2: Then, crayfish shell powder and modified reinforcing fiber are added into the mixture, and the mixture is continuously mixed and stirred to obtain an EPDM sheet material, wherein the mixing speed is controlled at 150 rpm / min and the stirring time is controlled at 122 minutes;

[0042] S3: adding soybean protein and additives into the interior of the EPDM sheet material, continuing the mixing reaction, and obtaining the EPDM sheet semi-finished product, the mixing speed is controlled at 320 rpm / min, and the stirring time is controlled at 5 minutes;

[0043] S4: pour the semi-finished EPDM sheet into a mold for extrusion molding, and finally perform a vulcanization reaction. After cooling, remove the excess part to obtain a short fiber reinforced EPDM sheet.

[0044] Reference Figure 1 , Embodiment 4

[0045] In this embodiment, a short fiber reinforced EPDM sheet is proposed, which includes the following components in weight ratio: 48 parts of ethylene propylene diene monomer rubber, 12 parts of modified polyacrylate, 5 parts of crayfish shell powder, 21 parts of modified reinforcing fiber, 6 parts of soy protein and 8 parts of additives. The raw materials of the modified reinforcing fiber include modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone. The solvent is dimethylformamide. The preparation method of the modified polyacrylate is as follows: prepare materials polyacrylate, tetrahydrofuran, azobisisobutyronitrile, fatty amine and sodium hydride, pour the polyacrylate, tetrahydrofuran and azobisisobutyronitrile into a reactor, and control the stirring speed at 660 rp per minute. m, the stirring temperature is controlled at 50°C, and the stirring treatment is carried out for 41 minutes to obtain a polyacrylate solution, and the fatty amine and sodium hydride are evenly dispersed in the polyacrylate solution. At a temperature of 23°C, the mixture is reacted for 2 hours to obtain a modified polyacrylate solution, and the modified polyacrylate solution is poured into a drying device for drying, and the powder is obtained to obtain a modified polyacrylate. The preparation method of crayfish shell powder is as follows: first, the crayfish shells are collected, cleaned and dried, and then placed in a high-temperature sterilization device for high-temperature disinfection and sterilization. After disinfection and sterilization, the crayfish shells are crushed and ground to obtain crayfish shell raw powder, and titanate coupling agent and epoxy resin are poured into deionized water, heated to dissolve, and then the crayfish shell raw powder is added, and the stirring speed is 0.05. The speed is controlled at 670 rpm per minute, and the stirring process is carried out for 39 minutes, and then dried and ground to obtain crayfish shell powder. The weight proportion of modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone in the modified reinforcing fiber raw material is controlled at 3:3:2:1:1, and the weight proportion of dimethylformamide is 7 times that of the modified reinforcing fiber raw material. The preparation method of modified polyamide fiber is as follows: obtain polyamide fiber, clean it and put it aside for storage, mix concentrated hydrochloric acid and deionized water evenly, add them into the reactor, and pour the polyamide fiber, control the stirring speed at 370 rpm per minute, control the stirring temperature at 41°C, stir for 35 minutes, filter after the reaction, and pour the filtrate into The modified polyamide fiber is removed, washed and dried to obtain a modified polyamide fiber. The preparation method of the modified reinforced fiber is as follows: modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone are obtained in proportion, graphene oxide and polyether ketone are added to dimethylformamide, and stirred at high speed until they are evenly mixed to obtain a treatment liquid, and then the modified polyamide fiber, polypropylene mesh fiber and aramid nanofiber are poured into the treatment liquid respectively, first stirred at a speed of 670 rpm for 20 minutes, and then ultrasonic treatment is started for 15 minutes to obtain the modified reinforced fiber, the additives include zinc oxide, sulfur and carbon black, the weight proportions of zinc oxide, sulfur and carbon black are controlled at 1:2:2, and soy protein is a powder material.

[0046] A preparation process of a short fiber reinforced EPDM sheet comprises the following steps:

[0047] S1: heating and melting EPDM rubber and modified polyacrylate and mixing them to obtain a mixture;

[0048] S2: Then, crayfish shell powder and modified reinforcing fiber are added into the mixture, and the mixture is continuously mixed and stirred to obtain an EPDM sheet material, wherein the mixing speed is controlled at 150 rpm / min and the stirring time is controlled at 122 minutes;

[0049] S3: adding soybean protein and additives into the interior of the EPDM sheet material, continuing the mixing reaction, and obtaining the EPDM sheet semi-finished product, the mixing speed is controlled at 320 rpm / min, and the stirring time is controlled at 5 minutes;

[0050] S4: pour the semi-finished EPDM sheet into a mold for extrusion molding, and finally perform a vulcanization reaction. After cooling, remove the excess part to obtain a short fiber reinforced EPDM sheet.

[0051] Reference Figure 1 Embodiment 5

[0052] In this embodiment, a short fiber reinforced EPDM sheet is proposed, which includes the following components in the following proportions by weight: 40 parts of ethylene propylene diene monomer rubber, 15 parts of modified polyacrylate, 9 parts of crayfish shell powder, 21 parts of modified reinforcing fiber, 9 parts of soy protein and 6 parts of additives. The raw materials of the modified reinforcing fiber include modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone. The solvent is dimethylformamide. The preparation method of the modified polyacrylate is as follows: prepare materials polyacrylate, tetrahydrofuran, azobisisobutyronitrile, fatty amine and sodium hydride, pour the polyacrylate, tetrahydrofuran and azobisisobutyronitrile into a reactor, and control the stirring speed at 660 rp per minute. m, the stirring temperature is controlled at 50°C, and the stirring treatment is carried out for 41 minutes to obtain a polyacrylate solution, and the fatty amine and sodium hydride are evenly dispersed in the polyacrylate solution. At a temperature of 23°C, the mixture is reacted for 2 hours to obtain a modified polyacrylate solution, and the modified polyacrylate solution is poured into a drying device for drying, and the powder is obtained to obtain a modified polyacrylate. The preparation method of crayfish shell powder is as follows: first, the crayfish shells are collected, cleaned and dried, and then placed in a high-temperature sterilization device for high-temperature disinfection and sterilization. After disinfection and sterilization, the crayfish shells are crushed and ground to obtain crayfish shell raw powder, and titanate coupling agent and epoxy resin are poured into deionized water, heated to dissolve, and then the crayfish shell raw powder is added, and the stirring speed is 0.05. The speed is controlled at 670 rpm per minute, and the stirring process is carried out for 39 minutes, and then dried and ground to obtain crayfish shell powder. The weight proportion of modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone in the modified reinforcing fiber raw material is controlled at 3:3:2:1:1, and the weight proportion of dimethylformamide is 7 times that of the modified reinforcing fiber raw material. The preparation method of modified polyamide fiber is as follows: obtain polyamide fiber, clean it and put it aside for storage, mix concentrated hydrochloric acid and deionized water evenly, add them into the reactor, and pour the polyamide fiber, control the stirring speed at 370 rpm per minute, control the stirring temperature at 41°C, stir for 35 minutes, filter after the reaction, and pour the filtrate into The modified polyamide fiber is removed, washed and dried to obtain a modified polyamide fiber. The preparation method of the modified reinforced fiber is as follows: modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone are obtained in proportion, graphene oxide and polyether ketone are added to dimethylformamide, and stirred at high speed until they are evenly mixed to obtain a treatment liquid, and then the modified polyamide fiber, polypropylene mesh fiber and aramid nanofiber are poured into the treatment liquid respectively, first stirred at a speed of 670 rpm for 20 minutes, and then ultrasonic treatment is started for 15 minutes to obtain the modified reinforced fiber, the additives include zinc oxide, sulfur and carbon black, the weight proportions of zinc oxide, sulfur and carbon black are controlled at 1:2:2, and soy protein is a powder material.

[0053] A preparation process of a short fiber reinforced EPDM sheet comprises the following steps:

[0054] S1: heating and melting EPDM rubber and modified polyacrylate and mixing them to obtain a mixture;

[0055] S2: Then, crayfish shell powder and modified reinforcing fiber are added into the mixture, and the mixture is continuously mixed and stirred to obtain an EPDM sheet material, wherein the mixing speed is controlled at 150 rpm / min and the stirring time is controlled at 122 minutes;

[0056] S3: adding soybean protein and additives into the interior of the EPDM sheet material, continuing the mixing reaction, and obtaining the EPDM sheet semi-finished product, the mixing speed is controlled at 320 rpm / min, and the stirring time is controlled at 5 minutes;

[0057] S4: pour the semi-finished EPDM sheet into a mold for extrusion molding, and finally perform a vulcanization reaction. After cooling, remove the excess part to obtain a short fiber reinforced EPDM sheet.

[0058] Comparing the conventional EPDM sheet with the EPDM sheet obtained in Examples 1 to 5, the EPDM sheets obtained in Examples 1 to 5 are shown in the following table:

[0059]

[0060]

[0061] The tensile test is conducted by using a tensile testing machine. The EPDM sheet is made into a standard specimen and fixed on the upper and lower fixtures of the testing machine. The specimen is stretched at a certain speed until it breaks. The tensile force and elongation during the test are recorded, and the tensile strength, tensile modulus, elongation at break and other indicators are obtained by calculation.

[0062] The tear test is carried out to measure the test specimens, which are trouser-shaped, Delft-shaped, crescent-shaped, right-angled, etc. The specific steps include cutting the specimens, paying attention to the direction of the bisector of the tear angle of the cutter being consistent with the calendering direction, measuring the thickness of the specimens, clamping the specimens in the upper and lower clamps of the tensile testing machine, adjusting the parameters of the testing machine, starting the testing machine to stretch the specimens at the specified speed until the specimens are torn, recording the relevant data and calculating the tear strength.

[0063] It can be seen from the above table that the tensile properties and tear properties of the EPDM sheet prepared by the present invention are significantly improved.

[0064] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A short fiber reinforced EPDM sheet, characterized in that: By weight, the invention comprises the following components in the following proportions: 40 to 50 parts of EPDM rubber, 10 to 15 parts of modified polyacrylate, 5 to 10 parts of crayfish shell powder, 15 to 25 parts of modified reinforcing fiber, 5 to 10 parts of soy protein and 5 to 10 parts of additives. The raw materials of the modified reinforcing fiber include modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone, and the solvent is dimethylformamide.

2. A short fiber reinforced EPDM sheet according to claim 1, characterized in that: The preparation method of the modified polyacrylate comprises the following steps: preparing materials of polyacrylate, tetrahydrofuran, azobisisobutyronitrile, fatty amine and sodium hydride, pouring the polyacrylate, tetrahydrofuran and azobisisobutyronitrile into a reaction kettle, controlling the stirring speed at 600 rpm to 720 rpm per minute, controlling the stirring temperature at 45° C. to 60° C., stirring for 30 to 45 minutes to obtain a polyacrylate solution, uniformly dispersing the fatty amine and sodium hydride in the polyacrylate solution, mixing and reacting for 1 to 3 hours at a temperature of 20° C. to 25° C. to obtain a modified polyacrylate solution, pouring the modified polyacrylate solution into a drying device for drying, and obtaining the modified polyacrylate in the form of powder.

3. The short fiber reinforced EPDM sheet according to claim 1, characterized in that: The preparation method of the crayfish shell powder comprises the following steps: firstly collecting crayfish shells, cleaning and drying them, and then placing them in a high-temperature sterilization device for high-temperature disinfection and sterilization treatment, crushing and grinding the crayfish shells after disinfection and sterilization to obtain crayfish shell raw powder, pouring a titanate coupling agent and an epoxy resin into deionized water, heating and dissolving them, and then adding the crayfish shell raw powder, controlling the stirring speed at 600 rpm to 720 rpm per minute, stirring for 30 minutes to 45 minutes, and finally drying and grinding to obtain the crayfish shell powder.

4. The short fiber reinforced EPDM sheet according to claim 1, characterized in that: The weight ratio of modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone in the modified reinforcing fiber raw material is controlled at 3:3:2:1:1, and the weight of dimethylformamide is 5 to 10 times that of the modified reinforcing fiber raw material.

5. The short fiber reinforced EPDM sheet according to claim 1, characterized in that: The preparation method of the modified polyamide fiber comprises the following steps: obtaining polyamide fiber, cleaning it and storing it aside, mixing concentrated hydrochloric acid and deionized water evenly, adding them into a reaction kettle, and pouring the polyamide fiber into the reaction kettle; controlling the stirring speed at 300 rpm to 420 rpm per minute, controlling the stirring temperature at 35° C. to 45° C., stirring for 15 minutes to 45 minutes, filtering after the reaction is completed, pouring away the filtrate, washing and drying to obtain the modified polyamide fiber.

6. The short fiber reinforced EPDM sheet according to claim 1, characterized in that: The preparation method of the modified reinforced fiber comprises the following steps: obtaining modified polyamide fiber, polypropylene mesh fiber, aramid nanofiber, graphene oxide and polyether ketone according to a proportion, adding graphene oxide and polyether ketone into dimethylformamide, stirring and mixing at a high speed until the mixture is uniform, thereby obtaining a treatment liquid, and then respectively pouring the modified polyamide fiber, polypropylene mesh fiber and aramid nanofiber into the treatment liquid, first stirring and treating the mixture at a speed of 600 rpm to 720 rpm for 15 to 30 minutes, and then starting ultrasonic treatment for 15 minutes, thereby obtaining the modified reinforced fiber.

7. The short fiber reinforced EPDM sheet according to claim 1, characterized in that: The additives include zinc oxide, sulfur and carbon black, the weight proportions of zinc oxide, sulfur and carbon black are controlled at 1:2:2, and the soybean protein is a powder material.

8. A process for preparing a short fiber reinforced EPDM sheet as claimed in claim 1, characterized in that: The following steps are involved: S1: heating and melting EPDM rubber and modified polyacrylate and mixing them to obtain a mixture; S2: Then, crayfish shell powder and modified reinforcing fiber are added into the mixture, and the mixture is continuously mixed and stirred to obtain an EPDM sheet material; S3: adding soybean protein and additives into the interior of the EPDM sheet material, and continuing the mixing reaction to obtain a semi-finished EPDM sheet material; S4: pour the semi-finished EPDM sheet into a mold for extrusion molding, and finally perform a vulcanization reaction. After cooling, remove the excess part to obtain a short fiber reinforced EPDM sheet.

9. The process for preparing a short fiber reinforced EPDM sheet according to claim 8, characterized in that: In S2, the mixing speed is controlled at 120 rpm / min to 180 rpm / min, and the stirring time is controlled at 15 minutes to 30 minutes.

10. The process for preparing a short fiber reinforced EPDM sheet according to claim 8, characterized in that: In S3, the mixing speed is controlled at 240 rpm / min to 320 rpm / min, and the stirring time is controlled at 5 minutes to 15 minutes.

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