Renewable resource prefabricated rubber runway and preparation method thereof

Abstract

The invention provides a renewable resource prefabricated rubber runway. The renewable resource prefabricated rubber runway comprises pine bark powder modified by a silane coupling agent. The pine bark powder modified by the silane coupling agent is used in the production of the renewable resource rubber runway, so that not only is the effective utilization of wastes realized, but also the mechanical property of the renewable resource runway can be remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of runway preparation, and in particular relates to a prefabricated rubber runway of renewable resources and a preparation method thereof. Background Art

[0002] The rubber track is also known as the all-weather track for athletics. It has the characteristics of good flatness, high compressive strength, appropriate hardness and elasticity, and stable physical properties. It is conducive to the athletes' speed and technique, effectively improving athletic performance and reducing the rate of falls.

[0003] Rubber tracks are widely used in major schools and stadiums in China because of their good elasticity, which is better for protecting the health of athletes than sandy tracks. They are also cheaper and easier to maintain than natural grass.

[0004] In order to strengthen scientific and technological innovation, model innovation and mechanism innovation in waste recycling, continuously open up new fields, create new momentum, expand waste recycling methods, enrich waste recycling categories, and enhance the value of waste recycling, the prefabricated rubber track made of recycled resources or waste has realized the effective utilization of waste. It not only carries the dreams and passion of athletes, but also carries our care and responsibility for our home planet.

[0005] However, currently, prefabricated rubber tracks produced from recycled rubber and recycled latex often use light calcium carbonate powder as filler, which results in poor mechanical properties. Therefore, providing a recycled resource rubber track with good performance has become a problem to be solved. Summary of the invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a prefabricated rubber track made of renewable resources and a preparation method thereof. The prefabricated rubber track made of renewable resources provided by the present invention has good mechanical properties.

[0007] The present invention also provides a prefabricated rubber track made of renewable resources, comprising pine bark powder modified by a silane coupling agent.

[0008] Preferably, the silane coupling agent is selected from silane coupling agent KH570.

[0009] Preferably, the method for preparing the pine bark powder modified by a silane coupling agent comprises the following steps:

[0010] The pine bark powder, white carbon black and a silane coupling agent are mixed and reacted to obtain the pine bark powder modified by the silane coupling agent.

[0011] Preferably, the mass ratio of the pine bark powder to white carbon black is 10-15:1-2;

[0012] The amount of the silane coupling agent used accounts for 1% to 2% of the total amount of the pine bark powder and white carbon black.

[0013] Preferably, the preparation raw materials include:

[0014] 35-80 parts of chlorobutyl reclaimed rubber, 40-60 parts of latex reclaimed rubber, 60-120 parts of pine bark powder modified with silane coupling agent, 20-30 parts of pigment, 10-20 parts of cyclohexane oil, 3-5 parts of zinc oxide, 4-8 parts of magnesium oxide, 1-4 parts of stearic acid, 1.5-3 parts of antioxidant, 1.5-3 parts of vulcanizing agent, and 1.2-10.5 parts of accelerator.

[0015] Preferably, the antioxidant is selected from one or more of antioxidant SP / p and antioxidant MB;

[0016] The accelerator is selected from one or more of accelerator DM, accelerator M, accelerator TMTD, and accelerator TBZTD;

[0017] The vulcanizing agent is selected from sulfur.

[0018] The present invention also provides a method for preparing the above-mentioned prefabricated rubber track made of renewable resources, comprising the following steps:

[0019] A) mixing chlorinated butyl reclaimed rubber and latex reclaimed rubber to obtain mixed reclaimed rubber;

[0020] B) mixing the pigment, zinc oxide, stearic acid, antioxidant and the mixed reclaimed rubber, then adding pine bark powder modified by a silane coupling agent and mixing, and then adding naphthenic oil and mixing to obtain a rubber compound;

[0021] C) refining, cooling and resting the rubber material in sequence to obtain a rested rubber material;

[0022] D) mixing the parked rubber with a vulcanizing agent and an accelerator and performing banburying to obtain a vulcanized rubber;

[0023] E) extruding the vulcanized rubber to obtain a film;

[0024] F) embossing, vulcanizing, cooling and rolling the film in sequence to obtain a recycled resource prefabricated rubber track.

[0025] Preferably, in step A), the mixing temperature is 80-90°C;

[0026] In step B), the temperature of mixing the pigment, zinc oxide, stearic acid, antioxidant and the mixed regenerated rubber is 90-100° C.;

[0027] The mixing temperature of adding pine bark powder modified by silane coupling agent is 100-120°C;

[0028] Add cyclohexane oil and mix to 110-125°C for debonding to obtain a rubber compound.

[0029] Preferably, in step C), the temperature of the smelting is 50-60° C. and the time is 5-10 minutes;

[0030] The parking time is 12 to 24 hours.

[0031] Preferably, in step F), the vulcanization temperature is 150-160°C.

[0032] Compared with the prior art, the present invention provides a prefabricated rubber track made of renewable resources, including pine bark powder modified by a silane coupling agent. The present invention uses the pine bark powder modified by a silane coupling agent in the production of a renewable resource rubber track, which not only realizes the effective utilization of waste, but also can significantly improve the mechanical properties of the renewable resource track. DETAILED DESCRIPTION

[0033] The invention provides a prefabricated rubber track made of renewable resources, comprising pine bark powder modified by a silane coupling agent.

[0034] The present invention uses pine bark powder modified by a silane coupling agent as filler, wherein the silane coupling agent is selected from silane coupling agent KH570.

[0035] The main components of pine bark include cellulose, lignin, resin and many other compounds. Cellulose and lignin are the main components of plant cell walls, and together they provide structural support for pine bark. Cellulose is a polysaccharide that enhances the durability and tensile strength of pine bark, while lignin is a complex organic polymer that gives pine bark more rigidity and corrosion resistance. Resin is one of the important characteristic substances of pine trees, mainly composed of monoterpenes, sesquiterpenes and aromatic compounds, and has antiseptic, antibacterial and insect repellent properties.

[0036] After the pine bark is modified by silane coupling agent, its surface properties are changed, and a hydrophilic siloxane film is formed on the surface, which increases the affinity between inorganic matter and organic polymer, thereby improving the adhesion of the pine bark powder surface. By combining lignin with rubber, the fiber-filled recycled rubber does not destroy the mechanical properties of rubber, but can also improve the mechanical properties of rubber, improve its heat resistance, water resistance and weather resistance, and economically and efficiently control the density of recycled rubber products. The recycled rubber is filled with a variety of fiber materials, and its density, elongation at break, tensile strength and other properties are excellent, and the process equipment is simple and the implementation cost is low. It can enhance the strength and durability of rubber materials and improve the thermal stability and wear resistance of rubber.

[0037] The present invention mixes pine bark powder, white carbon black and silane coupling agent and promotes them to react, which effectively solves the problem that white carbon black is easy to agglomerate and has poor dispersibility due to its high surface energy. The addition of pine bark powder not only enriches the composition of the material, but also significantly enhances the compatibility with the matrix material through the combination with white carbon black and the introduction of silane coupling agent. The silane coupling agent plays a key "bridge" role here, which tightly connects the white carbon black and the matrix, making the interface between the two more tightly and firmly bonded, thereby greatly improving the overall performance of the composite material. Finally, pine bark powder effectively modified by silane coupling agent is obtained.

[0038] In the present invention, the preparation method of the pine bark powder modified by a silane coupling agent comprises the following steps:

[0039] The pine bark powder, white carbon black and a silane coupling agent are mixed and reacted to obtain the pine bark powder modified by the silane coupling agent.

[0040] The present invention first prepares pine bark powder, and the preparation of the pine bark powder comprises the following steps:

[0041] The pine bark is screened, cleaned, dried, crushed, ground and sieved to obtain pine bark powder.

[0042] Specifically, the selection of pine bark: It is very important to select pine bark raw materials suitable for processing into pine bark powder. Usually, hard, non-rotten and clean pine bark materials are selected to ensure that the texture of the finished pine bark powder is fine and uniform.

[0043] Clean the screened pine bark powder: Make sure the surface of the pine bark is clean and tidy, without dust, debris, etc., so as not to affect the quality of the pine bark powder and the equipment in the processing process.

[0044] Dry the cleaned pine bark powder: Before processing the pine bark powder, it is necessary to control the humidity of the pine bark. Put the pine bark into the dryer and dry it at 100-110°C for 10-20 minutes to make its humidity meet the processing requirements.

[0045] Crush the dried pine bark: The screened pine bark needs to be crushed and a wood crusher is used to crush the pine bark into particles suitable for processing.

[0046] Next, the crushed pine bark particles are fed into a grinder and ground into pine bark powder.

[0047] Finally, the pine bark powder is sieved to obtain 80±5 mesh pine bark powder.

[0048] After the pine bark powder is obtained, the pine bark powder is modified, specifically, comprising the following steps:

[0049] Pine bark powder and white carbon black are mixed. Preferably, the present invention uses a preheated high-speed mixer for mixing, wherein the preheating temperature is preferably 80-110°C; the speed of the high-speed mixer is 30-50 rpm, and the mixing time is 10-15 min. The mass ratio of the pine bark powder and white carbon black is 10-15:1-2, which can be 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 10:2, 11:2, 13:2, 14:2, 15:2, or any value between 10-15:1-2. Since the texture of pine bark powder and white carbon black is bulky, high-speed stirring is easy to expand the pot, resulting in excessive dust. Therefore, in order to avoid dust, the amount of pine bark powder and white carbon black added to the high-speed mixer is less than half of the volume of the high-speed mixer.

[0050] After uniform mixing, a silane coupling agent is added for mixing reaction, wherein the silane coupling agent is preferably diluted with acetone, wherein the mass volume ratio of the silane coupling agent to the acetone is preferably 1g:1ml. The amount of the silane coupling agent (after dilution with acetone) accounts for 1% to 2% of the total amount of the pine bark powder and white carbon black, and can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or any value between 1% and 2%.

[0051] During the mixing, the silane coupling agent is added to the high-speed mixer in multiple times, preferably in two times. The mixing speed is 1300-1500 rpm and the mixing time is 3-5 min.

[0052] After the mixing is completed, the mixture is cooled to obtain pine bark powder modified by a silane coupling agent.

[0053] In some specific embodiments of the present invention, the raw materials for preparing the prefabricated rubber track from renewable resources include:

[0054] 35-80 parts of chlorobutyl reclaimed rubber, 40-60 parts of latex reclaimed rubber, 60-120 parts of pine bark powder modified with silane coupling agent, 20-30 parts of pigment, 10-20 parts of cyclohexane oil, 3-5 parts of zinc oxide, 4-8 parts of magnesium oxide, 1-4 parts of stearic acid, 1.5-3 parts of antioxidant, 1.5-3 parts of vulcanizing agent, and 1.2-10.5 parts of accelerator.

[0055] The raw materials for preparing the renewable resource prefabricated rubber track include 35 to 80 parts of chlorobutyl reclaimed rubber, which can be 35, 40, 45, 50, 55, 60, 62, 65, 67, 70, 72, 75, 78, 80, or any value between 35 and 80 parts. Among them, chlorobutyl reclaimed rubber (R-EPDM) is a white or colored block solid. Chlorobutyl reclaimed rubber is mostly made of medicinal butyl bottle stoppers as the main raw material and reducing agents, softening oil, calcium carbonate, etc. added during the regeneration process. It has good air tightness, plasticity, heat resistance, aging resistance, chemical corrosion resistance, and good blending effect with other rubbers.

[0056] The raw materials for preparing the prefabricated rubber track from renewable resources also include 40 to 60 parts of latex reclaimed rubber, which can be 40, 42, 45, 47, 50, 52, 55, 57, 60, or any value between 40 and 60 parts. In the present invention, the latex reclaimed rubber is a rubber composed of rubber hydrocarbons, water, etc. Latex reclaimed rubber is a latex raw material made from natural latex products or foreign products such as natural latex after desulfurization, which can be used to replace natural rubber, and its main components are rubber hydrocarbons, water, ash, etc.

[0057] The raw materials for preparing the recycled resource prefabricated rubber track also include 60 to 120 parts of pine bark powder modified by a silane coupling agent, which can be 60, 70, 80, 90, 100, 110, 120, or any value between 60 and 120 parts.

[0058] The raw materials for preparing the recycled resource prefabricated rubber track also include 20 to 30 parts of pigment, which can be 20, 22, 24, 25, 26, 28, 30, or any value between 20 and 30. In the present invention, there is no special limitation on the type of the pigment, and any pigment known to those skilled in the art that can be used in rubber tracks can be used, and the type of pigment can be selected according to demand.

[0059] The raw materials for preparing the prefabricated rubber track from renewable resources also include 10 to 20 parts of cyclohexane oil, which can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or any value between 10 and 20 parts.

[0060] The raw materials for preparing the recycled resource prefabricated rubber track also include 3 to 5 parts of zinc oxide, which can be 3, 3.5, 4, 4.5, 5, or any value between 3 and 5 parts.

[0061] The raw materials for preparing the recycled resource prefabricated rubber track also include 4 to 8 parts of magnesium oxide, which can be 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, or any value between 4 and 8 parts.

[0062] The raw materials for preparing the recycled resource prefabricated rubber track also include 1 to 4 parts of stearic acid, which can be 1, 1.5, 2, 2.5, 3, 3.5, 4, or any value between 1 and 4 parts.

[0063] The raw materials for preparing the recycled resource prefabricated rubber track also include 1.5 to 3 parts of antioxidant, which can be 1.5, 2, 2.5, 3, or any value between 1.5 and 3. In the present invention, the antioxidant is selected from one or more of antioxidant SP / p and antioxidant MB.

[0064] The raw materials for preparing the recycled resource prefabricated rubber track also include 1.5 to 3 parts of a vulcanizing agent, which can be 1.5, 2, 2.5, 3, or any value between 1.5 and 3. In the present invention, the vulcanizing agent is selected from sulfur.

[0065] The raw materials for preparing the recycled resource prefabricated rubber track also include 1.2 to 10.5 parts of accelerators, which can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 10.5, or any value between 1.2 and 10.5 parts, preferably any value between 2 and 5 parts. In the present invention, the accelerator is selected from one or more of accelerator DM, accelerator M, and accelerator TMTD. In some specific embodiments of the present invention, the accelerator includes 1 to 6 parts of accelerator DM and / or accelerator M and 0.2 to 4.5 parts of accelerator TMTD and / or accelerator TBZTD. Preferably, the accelerator comprises 1.5 to 3 parts of accelerator DM and / or accelerator M and 0.4 to 1.0 parts of accelerator TMTD and / or accelerator TBZTD.

[0066] The present invention also provides a method for preparing the above-mentioned prefabricated rubber track made of renewable resources, comprising the following steps:

[0067] A) mixing chlorinated butyl reclaimed rubber and latex reclaimed rubber to obtain mixed reclaimed rubber;

[0068] B) mixing the pigment, zinc oxide, stearic acid, antioxidant and the mixed reclaimed rubber, then adding pine bark powder modified by a silane coupling agent and mixing, and then adding naphthenic oil and mixing to obtain a rubber compound;

[0069] C) refining, cooling and resting the rubber material in sequence to obtain a rested rubber material;

[0070] D) mixing the parked rubber with a vulcanizing agent and an accelerator and performing banburying to obtain a vulcanized rubber;

[0071] E) extruding the vulcanized rubber to obtain a film;

[0072] F) embossing, vulcanizing, cooling and rolling the film in sequence to obtain a recycled resource prefabricated rubber track.

[0073] Specifically, the present invention first mixes chlorinated butyl reclaimed rubber and latex reclaimed rubber to obtain mixed reclaimed rubber. The mixing temperature is 80-90° C. and the mixing time is 3-5 minutes.

[0074] Next, the pigment, zinc oxide, stearic acid, antioxidant and the mixed recycled rubber are kneaded at a temperature of 90-100°C for 3-5 minutes. Pine bark powder modified by silane coupling agent is then added and kneaded at a temperature of 100-120°C for 3-8 minutes. Finally, naphthenic oil is added and kneaded until the temperature reaches 110-125°C for debonding to obtain a rubber compound.

[0075] The rubber material is successively subjected to refining, cooling and storage to obtain the stored rubber material.

[0076] The open refining is carried out by an open mill, and when the refining temperature reaches 60-70°C, the sheets are coated with rubber and cooled. The rubber material is left for 12-24 hours, which can be 12, 14, 16, 18, 20, 22, 24, or any value between 12 and 24 hours.

[0077] Next, the rubber compound after storage is mixed with a vulcanizing agent and an accelerator for internal kneading to obtain a vulcanized rubber compound. In the present invention, the internal kneading is carried out in an internal mixer, and the rubber compound is discharged when the apparent temperature of the internal mixer reaches 85-90°C.

[0078] Then, the vulcanized rubber is extruded to obtain a film. In the present invention, the extrusion is performed by an extruder to extrude a film having a thickness and a width that conforms to the prefabricated rubber track.

[0079] The film is sent to the hydraulic embossing machine via an automatic conveyor belt to emboss the film to meet the requirements of the prefabricated rubber track pattern.

[0080] The film with embossed patterns is sent to the hot air duct vulcanization line via an automatic conveyor belt. The vulcanization temperature is 150-160°C, which can be 150, 152, 154, 155, 156, 158, 160, or any value between 150 and 160°C.

[0081] Finally, the vulcanized film is automatically cooled in an air-cooling line for 25 to 30 minutes, automatically cut and rolled to the set length, and the product is put into storage.

[0082] The present invention uses pine bark powder modified by a silane coupling agent in the production of a renewable resource rubber track, which not only realizes the effective utilization of waste but also can significantly improve the mechanical properties of the renewable resource track.

[0083] In order to further understand the present invention, the prefabricated rubber track made of renewable resources and the preparation method thereof provided by the present invention are described below in conjunction with embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0084] Examples and Comparative Examples

[0085] 1. Formula, see Table 1

[0086] Table 1 Raw material formula (parts by weight)

[0087] Material Name Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Chlorobutyl reclaimed rubber 40 50 60 70 40 40 40 Latex recycled rubber 60 50 40 30 60 60 60 Modified pine bark powder 60 60 60 60 0 0 0 Unmodified pine bark powder 0 0 0 0 54 0 0 Light calcium carbonate powder 0 0 0 0 0 45 54 White Carbon Black 0 0 0 0 6 5 6 Naphthenic Oil 18 18 18 17 18 18 18 Zinc Oxide 5 5 5 5 5 5 5 Magnesium Oxide 5 5 5 5 5 5 5 Stearic acid 3.5 3.5 3.5 3.5 3.5 3.5 3.5 Antioxidant SP / p 1.7 1.7 1.7 1.7 1.7 1.7 1.7 sulfur 3 3 3 2.5 3 3 3 Accelerator DM 2.8 2.8 2.8 2.8 2.8 2.8 2.8 TMTD 0.65 0.65 0.65 0.65 0.65 0.65 0.65 Iron oxide red 20 20 20 20 20 20 20

[0088] In Table 1, chlorinated butyl reclaimed rubber (R-EPDM) was manufactured by Hengshui Dehai Rubber Products Co., Ltd.;

[0089] The latex reclaimed rubber is manufactured by Hengshui Dehai Rubber Products Co., Ltd.

[0090] The pine bark was sourced from Hebei Lianfang Agricultural Development Co., Ltd.

[0091] 1. The preparation method of pine bark powder is as follows:

[0092] 1. Selection of pine bark: It is very important to select pine bark raw materials suitable for processing into pine bark powder. Usually, hard, non-rotten and clean pine bark materials are selected to ensure that the texture of the finished pine bark powder is fine and uniform.

[0093] 2. Cleaning: Make sure the surface of the pine bark is clean and tidy, without dust, debris, etc., so as not to affect the quality of the pine bark powder and the equipment in the processing process.

[0094] 3. Adjust the humidity: Before processing pine bark powder, it is necessary to control the humidity of the pine bark. Put the pine bark into the dryer and dry it at 100-110℃ for 10-20 minutes to make its humidity meet the processing requirements.

[0095] 4. Pine bark crushing: The pine bark after screening needs to be crushed. A wood crusher is used to crush the pine bark into particles suitable for processing.

[0096] 5. Send the crushed pine bark particles into the grinder and grind them into pine bark powder.

[0097] 6. Screening: Screen into powder of about 80 mesh.

[0098] Modification of pine bark powder

[0099] Silane coupling agent KH 570 was used to modify the pine bark powder. The method is as follows:

[0100] First, set the premixing temperature, preheat the high-speed mixer to 110°C, add pine bark powder and white carbon black in a mass ratio of 13.5:1.5, stir at low speed (300 rpm) for 15 minutes to dehydrate, then add 1.5% silane coupling agent (the silane coupling agent is diluted 1 time with acetone solvent) twice, and stir at high speed (1500 rpm) for 5 minutes after each addition of the coupling agent; then open the discharge valve to release the modified pine bark powder, and when most of the material has been discharged, let it stand for 5 minutes, open the cover, and sweep all the remaining materials in the mixer into the bag. The mixed material is placed in the air for more than 24 hours to volatilize the solvent to obtain modified pine bark powder. In Table 1, the modified pine bark powder in Examples 1 to 4 includes white carbon black modified by silane coupling agent.

[0101] 2. Preparation of prefabricated rubber track made of recycled resources

[0102] 1. Preparation of raw materials. According to the formula, weigh chlorobutyl regenerated rubber, latex regenerated rubber, modified pine bark powder, iron oxide pigment, zinc oxide, stearic acid, antioxidant, cyclopentane oil, vulcanizing agent, and accelerator.

[0103] 2. Mix the rubber. First, put the chlorobutyl reclaimed rubber and latex reclaimed rubber into the internal mixer and mix for 3 to 5 minutes, then put the iron oxide pigment, zinc oxide, stearic acid, and antioxidant into the internal mixer and mix with the mixed reclaimed rubber for 3 to 5 minutes, then add the modified pine bark powder and mix for 2 to 4 minutes, then add the cyclohexane oil and mix until the temperature reaches 110 to 120 °C to discharge the rubber.

[0104] 3. Cool the rubber. Put the rubber discharged from the internal mixer into the open mixer. After the rubber temperature reaches 60-70℃, the sheet is cooled.

[0105] 4. Leave the rubber material to stand for 18 hours.

[0106] 5. Add sulfur. Put the parked rubber into the internal mixer, add vulcanizer and accelerator for internal mixing, and discharge the rubber when the temperature of the internal mixer reaches 85-90℃.

[0107] 6. Put the vulcanized rubber into the hot feed extruder to extrude a rubber sheet that meets the thickness and width of the prefabricated rubber track.

[0108] 7. Embossing. The film is sent to the hydraulic embossing machine via an automatic conveyor belt to emboss the film in accordance with the requirements of the prefabricated rubber track pattern.

[0109] 8 Vulcanization. The embossed film is sent to the hot air duct vulcanization line via an automatic conveyor belt, and the vulcanization temperature is 150-160℃.

[0110] 9 Cooling and rolling. The vulcanized film is automatically cooled by the air cooling line for about 25 to 30 minutes, and then automatically cut and rolled according to the set length, and the product is put into storage.

[0111] 3. Performance testing

[0112] The performance tests were conducted on the prefabricated rubber track films made from recycled resources obtained in the examples and comparative examples. The results are shown in Table 2.

[0113] Table 2 Performance test results

[0114] Test data item / unit Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Shock absorption / (%) 50 49 45 42 40 42 39 Vertical deformation / (mm) 0.3 0.32 0.38 0.4 0.4 0.43 0.42 Anti-slip value / (BPN) 47 45 43 43 42 42 41 Tensile strength / (MPa) 4.8 4.6 4.6 4.2 4 3.8 3.6 Elongation at break / (%) 780 750 706 680 600 580 520

[0115] It can be seen from the above table that the rubber products prepared in Examples 1 to 4 all meet the national standard GB / T43564-2023 for synthetic surface track and field venues for primary and secondary schools. The rubber product obtained in Example 1 has the best physical strength.

[0116] In the comparative example 1 in the above table, the physical performance indicators of the rubber product with the same amount of unmodified pine bark powder added are lower than those of the rubber product with modified pine bark powder.

[0117] In the comparative examples 2 and 3 in the above table, the physical performance indicators of the rubber products with light calcium carbonate powder added are lower than those of the rubber products with modified pine bark powder and also lower than those of the rubber products with unmodified pine bark powder.

[0118] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A prefabricated rubber track made from renewable resources. It is characterized in that Includes pine bark powder modified with a silane coupling agent.

2. The prefabricated rubber track made of renewable resources according to claim 1, It is characterized in that The silane coupling agent is selected from silane coupling agent KH570.

3. The prefabricated rubber track made of renewable resources according to claim 1, It is characterized in that The preparation method of the pine bark powder modified by a silane coupling agent comprises the following steps: The pine bark powder, white carbon black and a silane coupling agent are mixed and reacted to obtain pine bark powder modified by the silane coupling agent.

4. The prefabricated rubber track made of renewable resources according to claim 3, It is characterized in that The mass ratio of the pine bark powder to white carbon black is 10-15:1-2; The amount of the silane coupling agent used accounts for 1% to 2% of the total amount of the pine bark powder and white carbon black.

5. The prefabricated rubber track made of renewable resources according to claim 1, It is characterized in that The raw materials for preparation include: 35-80 parts of chlorobutyl reclaimed rubber, 40-60 parts of latex reclaimed rubber, 60-120 parts of pine bark powder modified with silane coupling agent, 20-30 parts of pigment, 10-20 parts of cyclohexane oil, 3-5 parts of zinc oxide, 4-8 parts of magnesium oxide, 1-4 parts of stearic acid, 1.5-3 parts of antioxidant, 1.5-3 parts of vulcanizing agent, and 1.2-10.5 parts of accelerator.

6. The prefabricated rubber track made of renewable resources according to claim 1, It is characterized in that The antioxidant is selected from one or more of antioxidant SP / p and antioxidant MB; The accelerator is selected from one or more of accelerator DM, accelerator M, accelerator TMTD, and accelerator TBZTD; The vulcanizing agent is selected from sulfur.

7. A method for preparing a prefabricated rubber track made of renewable resources as claimed in any one of claims 1 to 6, It is characterized in that The following steps are involved: A) mixing chlorinated butyl reclaimed rubber and latex reclaimed rubber to obtain mixed reclaimed rubber; B) mixing the pigment, zinc oxide, stearic acid, antioxidant and the mixed reclaimed rubber, then adding pine bark powder modified by a silane coupling agent and mixing, and then adding naphthenic oil and mixing to obtain a rubber compound; C) refining, cooling and resting the rubber material in sequence to obtain a rested rubber material; D) mixing the parked rubber with a vulcanizing agent and an accelerator and performing banburying to obtain a vulcanized rubber; E) extruding the vulcanized rubber to obtain a film; F) embossing, vulcanizing, cooling and rolling the film in sequence to obtain a recycled resource prefabricated rubber track.

8. The preparation method according to claim 7, It is characterized in that In step A), the mixing temperature is 80-90°C; In step B), the temperature of mixing the pigment, zinc oxide, stearic acid, antioxidant and the mixed regenerated rubber is 90-100° C.; The mixing temperature of adding pine bark powder modified by silane coupling agent is 100-120°C; Add cyclohexane oil and mix to 110-125°C for debonding to obtain a rubber compound.

9. The preparation method according to claim 7, It is characterized in that In step C), the temperature of the smelting is 50-60°C and the time is 5-10 minutes; The parking time is 12 to 24 hours.

10. The preparation method according to claim 7, It is characterized in that In step F), the vulcanization temperature is 150-160°C.