A low rolling resistance biomimetic coupling tread filled with waste tire particles

Abstract

The utility model discloses a kind of low rolling resistance bionic coupling tread rubber filled with waste tire particles, the tread rubber includes the symmetry line in center and two pattern areas mirror-symmetrical with symmetry line, the pattern area includes the first pattern unit extending outward from symmetry line, several second pattern units and third pattern units, the spacing between the first pattern unit and second pattern unit, the spacing between adjacent second pattern units and the spacing between second pattern unit and third pattern unit are same;First pattern block is arranged in the first pattern unit and second pattern unit with several along pattern unit extension direction array, second pattern block is arranged in third pattern unit with along third pattern unit uniform array, several first pattern blocks are filled between adjacent second pattern blocks. The utility model can improve the wear resistance of tread rubber.

Description

Technical Field

[0001] This utility model relates to the field of tread compound preparation, and in particular to a low rolling resistance biomimetic coupling tread compound filled with waste tire particles. Background Technology

[0002] With the continuous growth of global car ownership, the issue of waste tire disposal has become increasingly prominent. Due to their special material and structure, waste tires are difficult to degrade naturally. Large-scale accumulation not only occupies valuable land resources but also poses a potential source of environmental pollution, impacting soil, water, and ecosystems. Therefore, exploring effective recycling pathways for waste tires is not only crucial for resource conservation and environmental protection but also a vital part of promoting sustainable development. Against this backdrop, waste tire recycling technologies have emerged, with the use of waste tire pellets as fillers in tire or rubber product production becoming a promising solution. Processed waste tire pellets can effectively reduce the production costs of tires and other rubber products while decreasing reliance on virgin rubber resources, thus achieving resource recycling. However, how to further enhance the added value of waste tire pellet filler rubber products while ensuring their performance has become a focus of research.

[0003] Bionics, a design philosophy that mimics the structure and function of organisms in nature, offers a new approach to solving this problem. Many biological surfaces in nature possess unique textures and structures, which are not only aesthetically pleasing but also exhibit superior performance in reducing friction and improving wear resistance. For example, the intricate textures of some animal feet allow them to maintain stable grip in complex environments while reducing wear. Applying these biological principles to the design of tire tread compounds promises to improve tire wear resistance and grip by mimicking the textures of biological surfaces, while simultaneously reducing rolling resistance and achieving energy conservation and environmental protection goals. Meanwhile, the rapid development of 3D printing technology has brought revolutionary changes to the tire manufacturing industry. With its high precision, high flexibility, and customizability, 3D printing technology makes the manufacture of complex structures possible. In tire manufacturing, 3D printing technology can precisely control the shape, texture, and material distribution of tread compounds, achieving design effects that are difficult to achieve with traditional processes. Especially in the preparation of tread pattern layers, 3D printing technology can precisely print complex biomimetic textures as needed. These textures are not only aesthetically pleasing but, more importantly, can significantly improve tire wear resistance and grip. Combining the advantages of recycling waste tire granules, biomimetic design concepts, and 3D printing technology, this utility model patent proposes a low-rolling-resistance biomimetic coupled tread compound filled with waste tire granules and its 3D printing preparation method. The tread compound consists of two layers: an inner layer using a low-rolling-resistance tread compound filled with waste tire granules to reduce tire rolling resistance and achieve energy saving and environmental protection; and an outer layer precisely prepared using 3D printing technology, forming a biomimetic tread pattern layer coupled with a high-wear-resistant tread compound. This tread pattern layer is not only aesthetically pleasing but also forms a more effective coupled tread pattern through natural wear during tire use, further improving tire wear resistance. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the present invention provides a low rolling resistance biomimetic coupling tread compound filled with waste tire particles. The tread compound includes a symmetry line located at the center and two pattern regions mirror-symmetrical about the symmetry line. The pattern regions include a first pattern unit, a plurality of second pattern units, and a third pattern unit extending outward from the symmetry line. The spacing between the first and second pattern units, the spacing between adjacent second pattern units, and the spacing between the second and third pattern units are the same. The first and second pattern units are provided with a plurality of first pattern blocks arranged in an array along the extension direction of the pattern unit. The third pattern unit is provided with second pattern blocks uniformly arrayed along the third pattern unit. A plurality of first pattern blocks are filled between adjacent second pattern blocks.

[0005] Furthermore, the first patterned block includes four small circles and a central circle, the center line of the four small circles forms a square, and the central circle is located at the center of the square.

[0006] Furthermore, the radii of the four smaller circles are smaller than the radius of the central circle.

[0007] Furthermore, the first edge of the second patterned block is the edge of the third patterned unit, the second and third edges intersect at the other edge of the third patterned unit, and the included angle between the second and third edges is an acute angle.

[0008] Furthermore, a number of second patterned blocks divide the third patterned unit into several regions, and each region is provided with a number of first patterned blocks, the centers of which are collinear.

[0009] Furthermore, the first and second tread blocks are made of low rolling resistance rubber material, and the tread rubber is made of high wear-resistant rubber material.

[0010] Compared with the prior art, this utility model has the following technical effects:

[0011] This invention incorporates biomimetic patterns into the tire tread compound and uses two different materials coupled together to form a composite compound that combines rolling resistance and high wear resistance. Furthermore, the compound uses waste tires as raw materials, solving the problem of waste tire disposal, improving tire performance, and promoting the green development and technological innovation of the tire manufacturing industry.

[0012] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the tread pattern structure of a specific embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the first patterned block according to a specific embodiment of the present utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the second patterned block in a specific embodiment of the present invention. Detailed Implementation

[0016] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0017] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0018] like Figure 1 As shown, a low rolling resistance biomimetic coupling tread compound filled with waste tire particles is disclosed. The tread compound includes a symmetry line located at the center and two pattern regions mirror-symmetrical about the symmetry line. The pattern regions include a first pattern unit 1 extending outward from the symmetry line, a plurality of second pattern units 2 and a third pattern unit 3. The width of the first pattern unit 1 is greater than the width of the second pattern units. The first pattern unit 1, the second pattern unit 2 and the third pattern unit 3 are all rectangular structures extending along the direction of vehicle travel. Furthermore, a fourth pattern unit 4 is provided between the first pattern unit 1 and the second pattern unit 2, between adjacent second pattern units 2, and between the second pattern unit 2 and the third pattern unit 3. The fourth pattern 4 is a rectangular structure extending along the direction of vehicle travel, and the width K1 of each fourth pattern unit 4 is the same.

[0019] In one specific embodiment, the width K2 of the second pattern unit 2 ranges from 6 to 30 mm, the width K3 of the first pattern unit 1 ranges from 8 to 40 mm, and the width K1 of the fourth pattern unit 4 ranges from 2 to 10 mm.

[0020] As shown in the figure, the first pattern unit 1 and the second pattern unit 2 have the same structure and are composed of several uniformly distributed first pattern blocks A. In this embodiment, several first pattern blocks A in the first pattern unit 1 are arranged in a uniform array along the length direction of the first pattern unit 1.

[0021] Dung beetles belong to the subfamily Scarabaeinae (or Coprinae) of the order Coleoptera. Scanning electron microscopy studies of the dung beetle's body surface morphology revealed four types of depressions on its head, thorax, abdomen, and legs. Most of these depressions are arranged radially around the horns. The depression morphologies are simple pits, annular pits, pits with a central ridge, and grooved pits. The structure of the first patterned block A in this embodiment is as follows... Figure 2 As shown, the tread includes four small circles and a central circle. The radii of the four small circles are smaller than the radius of the central circle. The line connecting the centers of the four small circles forms a square, and the center of the central circle is located at the center of the square. The four small circles are radially distributed around the center circle, mimicking the surface structure of a dung beetle. During the wheel's movement, the evenly distributed first tread blocks make the surface of the tread rubber non-smooth. During operation, this changes the movement mode of the wear-resistant hard objects from sliding to rolling, and also helps to reduce positive pressure and friction, thereby reducing wear and extending the service life of the tread rubber.

[0022] In this embodiment, the distance L between the centers of two adjacent small circles ranges from 5 to 10 mm, the radius R2 of the small circle ranges from 1 to 3 mm, the radius R1 of the central circle ranges from 1.5 to 5 mm, and the distance J1 between the two first patterned blocks A ranges from 6 to 30 mm.

[0023] The third pattern unit 3 is provided with a second pattern block B uniformly arrayed along the extension direction of the third pattern unit, such as Figure 3 As shown, the second tread block B is triangular, comprising three sides: side a, side b, and side c. The length D1 of side a is less than the length D2 of side b, which is less than the length of side c. Side a coincides with the edge of the third tread unit 3. The intersection of sides b and c is located at the other edge of the third tread unit 3. The angle between side b and side a is obtuse, and both side b and side c form acute angles with the forward direction of the wheel. Since the third tread unit 3 is located at the edge of the tread rubber, the second tread block B serves as a lateral connecting pattern for the third tread unit 3, making the structure of the third tread unit 3 more durable and preventing damage to the third tread unit 3 during vehicle movement. Furthermore, the second tread block B in this application has a long, narrow triangular structure, which combines the stability of a triangle with improved water drainage performance of the tread rubber. In this embodiment, the ratio between the length D1 of side a and the length D2 of side b is 1:3, the range of D1 is 3-8mm, the range of D2 is 9-24mm, the included angle θ between side a and side b is 120-150°, and the range of the distance J2 between two adjacent second pattern blocks B is 15-25mm.

[0024] The area between adjacent second tread blocks B is filled with several first tread blocks A. The centers of all the central circles of the first tread blocks A are collinear, and the angle between the line connecting the centers and the direction of wheel travel is acute. In one specific embodiment, the line connecting the centers of the central circles is approximately parallel to side b or side c. The first tread blocks A and the second tread blocks B are arranged alternately, giving the tread rubber better wear resistance, wet skid resistance, and rolling resistance.

[0025] The tread compound consists of stacked low rolling resistance rubber layers and high abrasion-resistant rubber layers. The high abrasion-resistant rubber layer has grooves corresponding to the first tread block A, the second tread block B, and the fourth tread unit. The low rolling resistance rubber layer extends outward and fills the grooves. As the tire wears, the low rolling resistance rubber layer in the grooves protrudes outward, forming a raised tread pattern. The low rolling resistance tread compound is relatively soft, while the high abrasion-resistant tread compound is relatively hard. The two rubber layers with different properties are stacked and combined in an alternating "brick-and-mortar" manner to form a composite material, which can improve the tensile strength and abrasion resistance of the tread compound.

[0026] The low rolling resistance compound, by weight parts, comprises:

[0027] Natural rubber: 10-80 parts; Chlorohydrin compound ECO: 10-50 parts; Butadiene rubber BR9000: 10-80 parts; Low hysteresis carbon black DZ-13: 5-60 parts; Highly dispersed silica: 5-60 parts; Silane coupling agent: 3-5 parts; Waste tire granules: 20-60 parts; Aramid staple fiber: 3-10 parts; Zinc oxide: 3.5-5 parts; Stearic acid: 2-3 parts; Accelerator NS: 1.0-2 parts; Accelerator DTDM: 0.5-1 part; Anti-aging agent 4020: 2-4 parts; Anti-scorching agent CTP: 0.1-0.3 parts; Vulcanizing agent: 1.5-3 parts. In this embodiment, the low rolling resistance rubber compound uses ECO chlorohydrin compound, which, compared to natural rubber, has better heat and low temperature resistance, greater compression set and excellent dynamic fatigue performance. It is also better suited for 3D printing to prepare composite tread rubber. At the same time, the large amount of waste tire particles is considered to improve the utilization rate of waste tires.

[0028] In this embodiment, the waste tire particles contain 55-65% rubber, 25-30% carbon black, 3-8% silica, and 3-8% other components, with a particle size of 200-400 mesh.

[0029] The high abrasion-resistant rubber compound, by weight parts, comprises:

[0030] Natural rubber: 10-80 parts; Butadiene rubber BR9000: 10-90 parts; 2000-mesh zirconia nanoparticles (ZrO2): 2-5 parts; Carbon black N330: 10-60 parts; Silica: 5-60 parts; Silane coupling agent: 1-3 parts; Stearic acid: 2-3 parts; Anti-aging agent 4020: 2-4 parts; Environmentally friendly aromatic oil: 1-3 parts; Anti-scorching agent CTP: 0.1-0.3 parts; Zinc oxide: 3.5-4.5 parts; Accelerator NS: 1.0-1.8 parts; Accelerator DTDM: 0.3-0.8 parts; Vulcanizing agent: 1.3-2.6 parts; The 2000-mesh zirconia nanoparticles (ZrO2) in the high abrasion-resistant rubber compound in this embodiment can not only improve abrasion resistance, but also improve wet skid resistance.

[0031] All raw materials used in this application are purchased from the market. Specifically, the waste tire pellets are made from commercially available 60-150 mesh raw materials, ground to obtain the required 200-400 mesh pellets. Before use, the waste tire pellets require pretreatment, which includes:

[0032] Soak the waste tire pellets in a mixture of vegetable oil and silane coupling agent. The vegetable oil can be corn oil, which accounts for 20% of the mixture, and the silane coupling agent (KH550) accounts for 80% of the mixture. After soaking for 60-120 minutes, remove the pellets and air dry them (for 12-24 hours) for later use.

[0033] In one specific embodiment, a method for preparing a low rolling resistance biomimetic coupling tread compound filled with waste tire particles is provided, for preparing the tread compound described in the above embodiment, specifically including the following steps:

[0034] S1. Preparation of low rolling resistance rubber compound:

[0035] S11. Add natural rubber, chlorohydrin compound, and butadiene rubber, press the top plug to raise the temperature of the rubber compound to 140-160℃ and maintain it in the internal mixer for plasticizing for 120-180 seconds.

[0036] S12. Add all components except accelerator and vulcanizing agent by raising the top bolt, and press the top bolt to heat the rubber compound to 140-160℃ and hold for 120-180 seconds.

[0037] S13, remove glue, air cool for 2-4 hours;

[0038] S14. Add accelerator and vulcanizing agent to the open mill, heat the rubber compound to 70-90℃, and knead for 180-240 seconds to a thickness of 3-10mm. Let it stand at room temperature for 8-12 hours.

[0039] S2. Preparation of high abrasion-resistant adhesive materials:

[0040] S21. Add natural rubber, chlorohydrin compound, and butadiene rubber, press the top plug to raise the temperature of the rubber compound to 140-160℃ and maintain it in the internal mixer for plasticizing for 120-180 seconds.

[0041] S22. Add all components except accelerator and vulcanizing agent by raising the top bolt, and press the top bolt to heat the rubber compound to 140-160℃ and hold for 120-180 seconds.

[0042] S23, remove glue, and let it air cool for 2-4 hours;

[0043] S24. Place the rubber compound on a rolling mill, add the accelerator and vulcanizing agent, heat the compound to 70-90℃, roll for 180-240 seconds, and let it stand at room temperature for 8-12 hours.

[0044] S3. Prepare coupling materials using 3D printing. Place the low rolling resistance material and the high abrasion-resistant material into the two material hoppers of a two-color printer, respectively. Print according to the pattern of the outer layer. The printer head temperature is 140-160℃, and the extrusion pressure is 5-20MPa. Place the low rolling resistance material and the high abrasion-resistant material in sequence, put them into the production mold, apply pressure of 10-25MPa, temperature of 140-160℃, and time of 20-45min.

[0045] To further illustrate the effects of this utility model, in a specific embodiment, the components of Examples 1-4 and Comparative Examples 1-2 in Table 1 are used as raw materials for preparing low rolling resistance and high wear-resistant rubber compounds. The preparation method of the composite tread compound is as follows:

[0046] S1. Preparation of low rolling resistance rubber compound:

[0047] Add natural rubber, chlorohydrin compound, and butadiene rubber, press the top plug to heat the rubber compound to 160°C and maintain it in the internal mixer for 150 seconds; S12, press the top plug to add all components except accelerator and vulcanizing agent, press the top plug to heat the rubber compound to 150°C and maintain it for 160 seconds; discharge the rubber, air cool for 3 hours; put it on the open mill, add accelerator and vulcanizing agent, heat the rubber compound to 75°C, open mill for 200 seconds, the thickness is 8mm, and let it stand at room temperature for 12 hours;

[0048] S2. Preparation of high abrasion-resistant adhesive materials:

[0049] Add natural rubber, chlorohydrin compound, and butadiene rubber, press the top plug to raise the temperature of the rubber compound to 140-160℃ and maintain it in the internal mixer for 160 seconds; raise the top plug and add other components except for the accelerator and vulcanizing agent, press the top plug to raise the temperature of the rubber compound to 150℃ and maintain it for 180 seconds; discharge the rubber compound and let it air cool for 3 hours; put it on the open mill, add the accelerator and vulcanizing agent, raise the temperature of the rubber compound to 90℃, start mixing for 200 seconds, and let it stand at room temperature for 12 hours;

[0050] S3. The coupling material is prepared by 3D printing. The low rolling resistance material and the high wear-resistant material are placed into the two material hoppers of the two-color printer respectively. The printing is carried out according to the pattern of the outer layer. The printer head temperature is 150℃ and the extrusion pressure is 13MPa. The low rolling resistance material and the high wear-resistant material are placed in sequence and put into the production mold. The pressure is 13MPa, the temperature is 150℃, and the time is 30min.

[0051] Table 1: Component Table

[0052]

[0053]

[0054] Based on the components in Table 1, a composite tread compound was prepared, and (what experiment) was conducted, resulting in the experimental results shown in Table 2.

[0055] Table 2: Experimental Results

[0056]

[0057] In summary, the inner layer is composed of a low-rolling-resistance tread compound layer filled with waste tire particles, and the outer layer (pattern layer) is formed by coupling the low-rolling-resistance tread compound and the high-wear-resistant tread compound. The outer layer coupling rubber is prepared using 3D printing technology. Filling with a large amount of waste tires reduces tire costs and realizes the recycling of waste tires. The low rolling resistance of the tread compound also achieves energy conservation and environmental protection. Furthermore, by utilizing the different wear resistance of the two tread compounds, after wear, the tread compound will naturally form a coupled pattern, and the formation of the pattern can improve the wear resistance of the tread compound. Since the performance of the tread compound with waste tire particles decreases, the composite tread compound constructed by coupling the inner and outer tread compounds in this application can achieve good performance.

[0058] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A low rolling resistance biomimetic coupling tread compound filled with waste tire particles, characterized in that, The tread compound includes a symmetrical line at the center and two pattern areas mirror-symmetrical about the symmetrical line. Each pattern area includes a first pattern unit, several second pattern units, and a third pattern unit extending outward from the symmetrical line. The first, second, and third pattern units are all rectangular structures extending along the vehicle's forward direction. A fourth pattern unit is provided between the first and second pattern units, between adjacent second pattern units, and between the second and third pattern units. The fourth pattern unit is a rectangular structure extending along the vehicle's forward direction. Several first pattern blocks are arranged in an array along the extension direction of the pattern unit in the first and second pattern units. The third pattern unit contains second pattern blocks evenly arrayed along the third pattern unit. Several first pattern blocks are filled between adjacent second pattern blocks.

2. The low rolling resistance biomimetic coupling tread compound filled with waste tire particles according to claim 1, characterized in that, The first patterned block includes four small circles and a central circle. The center line connecting the centers of the four small circles forms a square, and the central circle is located at the center of the square.

3. The low rolling resistance biomimetic coupling tread compound filled with waste tire particles according to claim 2, characterized in that, The radii of the four smaller circles are smaller than the radius of the central circle.

4. The low rolling resistance biomimetic coupling tread compound filled with waste tire particles according to claim 1, characterized in that, The second patterned block is a triangle, the first side of which is the edge of the third patterned unit, the second and third sides intersect at the other edge of the third patterned unit, and the included angle between the second and third sides is an acute angle.

5. The low rolling resistance biomimetic coupling tread compound filled with waste tire particles according to claim 4, characterized in that, A number of second patterned blocks divide the third patterned unit into several regions, and a number of first patterned blocks are provided in each region, with the centers of each first patterned block being collinear.

6. The low rolling resistance biomimetic coupling tread compound filled with waste tire particles according to claim 5, characterized in that, The first and second tread blocks are made of low rolling resistance rubber material, and the tread rubber is made of high wear-resistant rubber material.

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