Degradable material reinforced environment-friendly tire

Abstract

The invention relates to the field of tires, and provides a degradable material reinforced environment-friendly tire, which comprises a tire main body, the tire main body at least comprises a tread, a sidewall, a cord fabric layer and a tire bead, the tread contains a degradable rubber material, and the degradable rubber material accounts for 20-50% of the total mass of the tread; the degradable rubber material contains polycaprolactone modified natural rubber accounting for 10%-30% of the total mass and is prepared by adopting a dynamic vulcanization process, dicumyl peroxide serves as a vulcanizing agent, the addition amount of dicumyl peroxide is 0.5%-1.5%, the vulcanization temperature is 140-160 DEG C, the vulcanization time is 8-15 minutes, and the number-average molecular weight of polycaprolactone is 10000-30000. The environment-friendly tire provided by the invention can be gradually decomposed in the natural environment, so that the pollution of the waste tire to the environment is effectively reduced, the problem that the traditional tire is difficult to degrade is solved, and the occupation of land resources and the risk of environmental pollution are greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of tires, in particular to an environmentally friendly tire reinforced with degradable materials. Background Art

[0002] With the continuous improvement of global environmental awareness, various industries are actively exploring green and sustainable development paths, and the tire industry is no exception. Traditional tires are difficult to degrade naturally after use. The accumulation of large amounts of discarded tires not only occupies land resources, but also causes serious pollution to the environment. According to statistics, the number of discarded tires generated worldwide each year is as high as billions, and the disposal of these discarded tires has become an environmental problem that needs to be solved urgently. At the same time, the rapid development of the automotive industry has placed higher requirements on tire performance, such as lower rolling resistance to improve fuel efficiency, and better wet grip to ensure driving safety. Therefore, the development of a degradable and high-performance environmentally friendly tire has become an important research direction for the tire industry.

[0003] Currently, some tire companies are exploring the degradability of tires. For example, starch-based rubber is added to the tread, but its mechanical properties (tensile strength is only 800-1000 MPa) are difficult to meet the requirements of load-bearing tires. Another study (the document "Polymer Degradation and Stabilization") used polyhydroxyalkanoate (PHA) to modify the sidewall material, but PHA has a high glass transition temperature, resulting in brittle cracking in low-temperature environments. In addition, bamboo fiber reinforced cord ply technology has been proposed, but the weak interface between bamboo fiber and rubber has not been resolved, leading to the risk of interlayer delamination.

[0004] However, the existing technology still has many problems. On the one hand, the amount of degradable materials added to most degradable tires is limited, and the degradation effect is not obvious, making it difficult to fundamentally solve the pollution problem of discarded tires. On the other hand, when improving tire performance, the synergistic effect between materials is often ignored, resulting in the addition of degradable materials, which affects the key indicators of the tire such as strength and wear resistance. In addition, the manufacturing process of existing degradable tires is complex and costly, which limits their large-scale production and promotion and application. During the manufacturing process, the uniformity of mixing degradable materials with traditional materials is difficult to ensure, which affects the stability of tire quality. At the same time, the complex manufacturing process increases energy consumption and production costs, making degradable tires lack price competitiveness in the market. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides an environmentally friendly tire reinforced with degradable materials, which solves the problem that traditional tires are difficult to degrade.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an environmentally friendly tire reinforced with a degradable material, comprising a tire body, wherein the tire body is composed of at least a tread, a sidewall, a cord layer, and a bead:

[0007] The tread contains a degradable rubber material, and the degradable rubber material accounts for 20% to 50% of the total mass of the tread. The degradable rubber material contains 10% to 30% of polycaprolactone-modified natural rubber by mass. The tread is prepared by a dynamic vulcanization process, the vulcanizing agent is dicumyl peroxide, the addition amount is 0.5% to 1.5%, the vulcanization temperature is 140 to 160° C., the vulcanization time is 8 to 15 minutes, and the number average molecular weight of the polycaprolactone is 10,000 to 30,000.

[0008] The cord layer is made of a blend of polylactic acid fiber and bamboo fiber in a mass ratio of 3:1 to 5:1. The degradable fiber material has a tensile strength of 1000 MPa to 2000 MPa, an elongation at break of 5% to 15%, and a warp-to-weft strength ratio of 1.2 to 1.5.

[0009] The sidewall is made of a degradable polyurethane elastomer material with a Shore hardness of A60 to A80; and a reinforcing rib is provided inside the sidewall, and the reinforcing rib is made of degradable polyester fiber;

[0010] The tire bead includes a tire bead wire and a degradable rubber coating layer. The tire bead wire has a diameter of 1.0 to 2.0 mm, and its surface is copper-plated with a thickness of 0.01 to 0.05 mm. The degradable rubber coating layer is made of degradable styrene-butadiene rubber with a glass transition temperature between -40°C and -20°C.

[0011] Preferably, the tire body is added with nano-scale calcium carbonate whiskers, whose aspect ratio is 10 to 50 and whose mass fraction in the tire body is 5% to 10%; and the calcium carbonate whiskers are surface-modified, and the surface modifier is a silane coupling agent, and its coverage on the surface of the calcium carbonate whiskers is 80% to 85%.

[0012] Preferably, the reinforcing ribs added inside the sidewall have a diameter of 0.5 to 2 mm, and the spacing between the reinforcing ribs is 10 to 30 mm.

[0013] Preferably, the cord layer is made by a textile process, and the process steps are as follows:

[0014] S1,

[0015] Soak the polylactic acid fiber in a solution containing a softener and an antistatic agent at 30-40°C for 30-60 minutes, then dehydrate and dry;

[0016] After scouring for 60 to 90 minutes in a solution containing sodium hydroxide and sodium sulfite at a temperature of 90 to 100°C, the degumming treatment is carried out, and then the degumming treatment is carried out, and ...

[0017] According to the mass ratio of (3:1) to (5:1), polylactic acid fiber and bamboo fiber are grabbed by a cotton grabber, and then opened, combed, loosened, and mixed to form uniform cotton strips.

[0018] S2,

[0019] The yarn made from the cotton strips prepared in S1 is wound in parallel onto a warp beam, with the warping speed controlled at 400-600 m / min and the tension difference controlled at ±5 cN. An environmentally friendly starch-polyvinyl alcohol mixed slurry is used for sizing, with a slurry concentration of 10-15%, a temperature of 90-95°C, and a sizing rate controlled at 8-12%. According to the requirements of the warp and weft strength ratio, a rapier loom is used for weaving, with the weaving parameters being a warp tension of 180-220 cN, a weft tension of 150-180 cN, an opening time of 280-310°, and a weft insertion time of 70-90°.

[0020] S3,

[0021] The fabric woven by S2 is treated in hot air at 160-180℃ for 1-3 minutes at a speed of 20-30 m / min, and then pre-shrunk by a mechanical pre-shrinking machine with the pre-shrinkage rate controlled at 3-5%. After finishing, the performance indicators of the cord are tested by an electronic universal material testing machine.

[0022] Preferably, the tread pattern adopts an asymmetric design, and the pattern depth is 6 to 10 mm; the shape of the pattern block is an irregular polygon, and adjacent pattern blocks are connected by connecting ribs, the width of the connecting rib is 2 to 5 mm, and the height is 1 to 3 mm; the width of the pattern groove is 3 to 8 mm, and the depth is 0.5 to 0.8 times the pattern depth.

[0023] Preferably, the surface of the copper-plated layer of the tire bead wire is coated with a degradable bio-based anti-corrosion coating with a coating thickness of 0.005 to 0.015 mm. The anti-corrosion coating is composed of a complex of polyhydroxyalkanoate and tannic acid with a mass ratio of 2:1 to 4:1.

[0024] A manufacturing process for an environmentally friendly tire reinforced with a degradable material comprises the following steps:

[0025] Step 1: Prepare the ingredients

[0026] Accurately weigh polycaprolactone modified natural rubber, polylactic acid fiber, bamboo fiber, degradable polyurethane elastomer material, degradable styrene-butadiene rubber, calcium carbonate whiskers, silane coupling agent and other raw materials according to the proportion;

[0027] Step 2: Mixing

[0028] Put polycaprolactone modified natural rubber and other rubber raw materials into an internal mixer, mix them at 120-150°C for 10-20 minutes, then add calcium carbonate whiskers in sequence and continue mixing for 5-10 minutes; then carry out open mixing, control the open mixing temperature at 80-100°C and the mixing time for 5-10 minutes;

[0029] Step 3: Molding

[0030] The mixed rubber material is extruded through an extruder at an extrusion temperature of 100-130°C to form semi-finished products of tread, sidewall, cord layer and bead. The semi-finished products are combined and placed in a vulcanizer for vulcanization at 150-180°C for 20-40 minutes.

[0031] Preferably, the kneading process in step 2 is carried out in a staged heating manner, first kneading at 120° C. for 5 to 10 minutes, then heating to 150° C. and continuing kneading for 5 to 10 minutes; a thin-pass process is adopted during the initial kneading, and the number of thin-passes is 3 to 5 times.

[0032] Preferably, during the banburying process of step 2, the added calcium carbonate whiskers need to be pre-dispersed with a silane coupling agent before banburying, the pre-dispersion temperature is 60-80° C., the time is 10-15 minutes, and the mixing speed is 200-400 r / min.

[0033] Preferably, during the vulcanization process in step 3, nitrogen vulcanization technology is used, the vulcanization pressure is controlled at 1.5-2.5 MPa, and the vulcanization time is adjusted in stages according to the tire specifications:

[0034] The first stage: 10-15 minutes, pressure 1.5 MPa, temperature 150-160°C;

[0035] The second stage: 10 to 25 minutes, pressure 2.0 to 2.5 MPa, temperature 170 to 180°C.

[0036] The present invention provides an environmentally friendly tire reinforced with a degradable material. It has the following beneficial effects:

[0037] 1. The polycaprolactone-modified natural rubber prepared by the dynamic vulcanization process of the present invention is synergistically reinforced with nano-calcium carbonate whiskers, and the tread tensile strength reaches 1500-2000 MPa. At the same time, the degradation rate within one year is increased to 45%-55%, far exceeding that of traditional bio-based rubber, achieving full biodegradation of the tire bead.

[0038] 2. The present invention optimizes multiple properties while maintaining good mechanical properties, and increases the strength retention rate by more than 30% in a hot and humid environment.

[0039] 3. The present invention improves material utilization, reduces energy consumption, and complies with international green tire standards. At the same time, the raw materials used are mostly degradable or renewable materials with a wide range of sources and relatively low costs. This makes the tire not only environmentally friendly but also cost-effective, which is conducive to large-scale production and market promotion, and promotes the sustainable development of the tire industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Flowchart of the present invention. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] An embodiment of the present invention provides an environmentally friendly tire reinforced with a degradable material.

[0043] As one aspect of the present invention, the present invention provides an environmentally friendly tire reinforced with a degradable material, comprising a tire body, wherein the tire body is composed of at least a tread, a sidewall, a cord layer, and a bead.

[0044] Nano-scale calcium carbonate whiskers are added to the tire body, with an aspect ratio of 20 to 40 and a mass fraction of 6% to 9% in the tire body. The calcium carbonate whiskers are surface-modified with a silane coupling agent, which has a coverage rate of 80% to 85% on the surface of the calcium carbonate whiskers.

[0045] The tread contains a degradable rubber material, and the degradable rubber material accounts for 25% to 45% of the total mass of the tread. The degradable rubber material contains 15% to 25% of polycaprolactone-modified natural rubber in the total mass. The tread is prepared by a dynamic vulcanization process, the vulcanizing agent is dicumyl peroxide, the addition amount is 0.7% to 1.3%, the vulcanization temperature is 148 to 154° C., the vulcanization time is 10 to 13 minutes, the number average molecular weight of the polycaprolactone is 10,000 to 30,000, and the tread pattern adopts an asymmetric design with a pattern depth of 6 to 10 mm; the shape of the pattern blocks is an irregular polygon, and adjacent pattern blocks are connected by connecting ribs with a width of 2 to 5 mm and a height of 1 to 3 mm; the width of the pattern groove is 3 to 8 mm, and the depth is 0.5 to 0.8 times the pattern depth;

[0046] The cord layer is made of a blend of polylactic acid fiber and bamboo fiber in a mass ratio of 3:1 to 5:1. The tensile strength of the biodegradable fiber material is 1000MPa to 2000MPa, the elongation at break is 5% to 15%, and the warp-to-weft strength ratio is between 1.2 and 1.5.

[0047] The tire sidewalls are made of degradable polyurethane elastomer with a Shore hardness of A60 to A80. The tire sidewalls are internally provided with reinforcing ribs made of degradable polyester fibers. The ribs have a diameter of 0.5 to 2 mm and are spaced 10 to 30 mm apart.

[0048] The tire bead includes a tire bead wire and a degradable rubber coating. The diameter of the tire bead wire is 1.0 to 2.0 mm, and its surface is copper-plated with a thickness of 0.01 to 0.05 mm. The surface of the copper-plated layer of the tire bead wire is coated with a degradable bio-based anti-corrosion coating with a thickness of 0.005 to 0.015 mm. The anti-corrosion coating is composed of a complex of polyhydroxyalkanoate and tannic acid with a mass ratio of 2:1 to 4:1. The degradable rubber coating adopts degradable styrene-butadiene rubber with a glass transition temperature between -40°C and -20°C.

[0049] As another aspect of the present invention, please refer to Figure 1 The present invention provides a process for manufacturing an environmentally friendly tire reinforced with a degradable material, comprising the following steps:

[0050] Step 1: Prepare the ingredients

[0051] Accurately weigh polycaprolactone modified natural rubber, polylactic acid fiber, bamboo fiber, degradable polyurethane elastomer material, degradable styrene-butadiene rubber, calcium carbonate whiskers, silane coupling agent and other raw materials according to the proportion;

[0052] Step 2: Mixing

[0053] Putting polycaprolactone modified natural rubber and other rubber raw materials into an internal mixer, adopting a staged heating method, first mixing at 120°C for 5-10 minutes, then heating to 150°C and continuing mixing for 5-10 minutes; adopting a thin pass process during the open mixing, the number of thin passes is 3-5, and then calcium carbonate whiskers are added in sequence, and the mixing is continued for 5-10 minutes. The added calcium carbonate whiskers need to be pre-dispersed with a silane coupling agent before mixing, the pre-dispersion temperature is 60-80°C, the mixing time is 10-15 minutes, and the mixing speed is 200-400r / min; then the open mixing is carried out, the open mixing temperature is controlled at 80-100°C, and the mixing time is 5-10 minutes.

[0054] Step 3: Molding

[0055] The mixed rubber compound is extruded through an extruder at an extrusion temperature of 100-130°C to form semi-finished products of tread, sidewall, cord layer and bead. The semi-finished products are combined and placed in a vulcanizer for vulcanization at 150-180°C for 20-40 minutes. In the vulcanization process of step 3, nitrogen vulcanization technology is used, and the vulcanization pressure is controlled at 1.5-2.5MPa. The vulcanization time is adjusted in stages according to the tire specifications:

[0056] The first stage: 10-15 minutes, pressure 1.5 MPa, temperature 150-160°C;

[0057] The second stage: 10 to 25 minutes, pressure 2.0 to 2.5 MPa, temperature 170 to 180°C.

[0058] In addition, the cord layer is made by a textile process, and the process steps are as follows:

[0059] S1,

[0060] Soak the polylactic acid fiber in a solution containing a softener and an antistatic agent at 30-40°C for 30-60 minutes, then dehydrate and dry;

[0061] After scouring for 60 to 90 minutes in a solution containing sodium hydroxide and sodium sulfite at a temperature of 90 to 100°C, the degumming treatment is carried out, and then the degumming treatment is carried out, and ...

[0062] According to the mass ratio of (3:1) to (5:1), polylactic acid fiber and bamboo fiber are grabbed by a cotton grabber, and then opened, combed, loosened, and mixed to form uniform cotton strips.

[0063] S2,

[0064] The yarn made from the cotton strips prepared in S1 is wound in parallel onto a warp beam, with the warping speed controlled at 400-600 m / min and the tension difference controlled at ±5 cN. An environmentally friendly starch-polyvinyl alcohol mixed slurry is used for sizing, with a slurry concentration of 10-15%, a temperature of 90-95°C, and a sizing rate controlled at 8-12%. According to the requirements of the warp and weft strength ratio, a rapier loom is used for weaving, with the weaving parameters being a warp tension of 180-220 cN, a weft tension of 150-180 cN, an opening time of 280-310°, and a weft insertion time of 70-90°.

[0065] S3,

[0066] The fabric woven by S2 is treated in hot air at 160-180℃ for 1-3 minutes at a speed of 20-30 m / min, and then pre-shrunk by a mechanical pre-shrinking machine with the pre-shrinkage rate controlled at 3-5%. After finishing, the performance indicators of the cord are tested by an electronic universal material testing machine.

[0067] In order to better illustrate the implementation of the environmentally friendly tire reinforced with degradable materials of the present invention, the following examples are given:

[0068] Example 1

[0069] Materials and parameters of each part of the tire

[0070] Tread: Degradable rubber material accounts for 30% of the total tread mass, of which polycaprolactone-modified natural rubber accounts for 20%. The polycaprolactone has a number-average molecular weight of 20,000 and is prepared using a dynamic vulcanization process with a dicumyl peroxide content of 1.0%, a vulcanization temperature of 150°C, and a vulcanization time of 12 minutes.

[0071] The cord layer has a polylactic acid fiber to bamboo fiber mass ratio of 4:1, a tensile strength of 1500 MPa, an elongation at break of 10%, and a warp-to-weft strength ratio of 1.3. The yarn is prepared according to the textile process of claim 4, wherein the polylactic acid fiber is soaked in a solution containing a softener and antistatic agent at 35°C for 45 minutes, then dehydrated and dried; the bamboo fiber is scoured in a solution containing sodium hydroxide and sodium sulfite at 95°C for 75 minutes for degumming, then soaked in a 20% sodium hydroxide solution at room temperature for 25 minutes, washed to a neutral temperature, and dried; and slivers are produced through plucking, opening, and carding. The yarn produced from the slivers is warped at a speed of 500 m / min with a tension differential controlled to ±5 cN. The yarn is sized with an environmentally friendly starch-polyvinyl alcohol blend at a concentration of 12% and a temperature of 92°C, with a sizing rate of 10%. The yarn is woven on a rapier loom with a warp tension of 200 cN, a weft tension of 160 cN, a shedding time of 295°, and a weft insertion time of 80°. The fabric was treated in hot air at 170° C. for 2 minutes at a speed of 25 m / min, and then pre-shrunk using a mechanical pre-shrinking machine with a pre-shrinkage rate of 4%.

[0072] Sidewall: Degradable polyurethane elastomer material with Shore hardness of A70, internal reinforcement ribs are made of degradable polyester fiber, with a diameter of 1.0mm and a spacing of 20mm.

[0073] Bead: Bead wire diameter 1.5mm, copper plating 0.03mm thick, coated with a 0.01mm thick biodegradable anti-corrosion coating containing a 3:1 polyhydroxyalkanoate to tannic acid ratio. The degradable rubber coating is made of degradable styrene-butadiene rubber with a glass transition temperature of -30°C.

[0074] Other additives: Nano-scale calcium carbonate whiskers with an aspect ratio of 30 and a mass fraction of 8% are added to the tire body. The calcium carbonate whiskers are surface-modified with a silane coupling agent, with a coverage of 83%. Before mixing, they are pre-dispersed with the silane coupling agent at 70°C for 12 minutes at a mixing speed of 300 rpm.

[0075] Tread pattern: adopts an asymmetric design, with a pattern depth of 8mm. The pattern blocks are irregular polygons. Adjacent pattern blocks are connected by connecting ribs with a width of 3mm and a height of 2mm. The groove width is 5mm and the depth is 0.6 times the pattern depth.

[0076] Manufacturing process

[0077] Raw material preparation: Accurately weigh polycaprolactone modified natural rubber, polylactic acid fiber, bamboo fiber, degradable polyurethane elastomer material, degradable styrene-butadiene rubber, calcium carbonate whiskers, silane coupling agent and other raw materials.

[0078] Mixing: Polycaprolactone modified natural rubber and other rubber raw materials are mixed at 135℃ for 15 minutes, and then mixed for 8 minutes after adding calcium carbonate whiskers. The mixing temperature is 90℃ and the mixing time is 8 minutes. The mixing adopts staged temperature increase, first mixing at 120℃ for 8 minutes, then heating to 150℃ for 7 minutes. The mixing adopts thin-pass process, and thin-pass is performed 4 times.

[0079] Molding: The mixed rubber material is extruded at 120℃ to form semi-finished components.

[0080] Vulcanization: Nitrogen-filled vulcanization technology is used, with the vulcanization pressure controlled at 2.0 MPa, and vulcanization is carried out in stages. The first stage lasts 12 minutes at a pressure of 1.5 MPa and a temperature of 155°C; the second stage lasts 18 minutes at a pressure of 2.0 MPa and a temperature of 175°C.

[0081] Example 2

[0082] Materials and parameters of each part of the tire

[0083] Tread: Degradable rubber accounts for 25% of the total tread mass, while polycaprolactone-modified natural rubber accounts for 15% of the total degradable rubber mass. The polycaprolactone has a number-average molecular weight of 15,000. Dynamic vulcanization process parameters: 0.8% dicumyl peroxide, curing temperature of 145°C, and curing time of 10 minutes.

[0084] Ply fabric: PLA to bamboo fiber mass ratio of 3.5:1, tensile strength 1300 MPa, elongation at break 12%, warp-to-weft strength ratio 1.25. Textile process parameters: PLA fiber treatment temperature 32°C, soaking for 50 minutes; bamboo fiber degumming temperature 92°C, scouring for 80 minutes, sodium hydroxide solution 19%, soaking for 28 minutes. Warping speed 450 m / min, sizing solution concentration 11%, temperature 93°C, sizing rate 9%. Weaving: warp tension 190 cN, weft tension 155 cN, opening time 285°, weft insertion time 75°. Hot air treatment temperature 165°C, time 2.5 minutes, speed 22 m / min, shrinkage 3.5%.

[0085] Sidewall: biodegradable polyurethane elastomer material, Shore hardness A65, reinforcement rib diameter 0.8mm, spacing 25mm.

[0086] Bead: Bead wire diameter 1.3mm, copper plating thickness 0.02mm, anti-corrosion coating thickness 0.008mm, polyhydroxyalkanoate to tannic acid mass ratio 2.5:1. Degradable styrene-butadiene rubber glass transition temperature -35°C.

[0087] Other additives: nano-scale calcium carbonate whiskers with an aspect ratio of 20, a mass fraction of 6%, a coverage rate of 82%, a pre-dispersion temperature of 65°C, a time of 13 minutes, and a rotation speed of 250 r / min.

[0088] Tread pattern: pattern depth 7mm, connecting rib width 2.5mm, height 1.5mm, pattern groove width 4mm, depth is 0.7 times the pattern depth.

[0089] Manufacturing process

[0090] Raw material preparation: same as Example 1.

[0091] Mixing: Rubber raw materials are mixed at 130℃ for 13 minutes, then mixed for 7 minutes after adding calcium carbonate whiskers, and the mixing temperature is opened at 85℃ for 7 minutes. Mixing is carried out in stages, mixing at 120℃ for 7 minutes, mixing at 150℃ for 6 minutes, and thinning 3 times.

[0092] Molding: Extrusion molding at 115℃.

[0093] Vulcanization: Nitrogen vulcanization, pressure 1.8MPa. The first stage is 10 minutes, pressure 1.5MPa, temperature 152℃; the second stage is 15 minutes, pressure 2.0MPa, temperature 172℃.

[0094] Example 3

[0095] Materials and parameters of each part of the tire

[0096] Tread: 40% of the tread is made of biodegradable rubber, 25% of which is made of polycaprolactone-modified natural rubber. The polycaprolactone has a number-average molecular weight of 25,000. The curing agent is added at a level of 1.2%, the curing temperature is 155°C, and the curing time is 13 minutes.

[0097] Ply fabric: PLA to bamboo fiber mass ratio of 4.5:1, tensile strength 1700 MPa, elongation at break 8%, warp-to-weft strength ratio 1.4. Textile process parameters: PLA fiber soaked at 38°C for 35 minutes; bamboo fiber degumming temperature 98°C, scouring for 65 minutes, soaked in 21% sodium hydroxide solution for 22 minutes. Warping speed 550 m / min, sizing solution concentration 13%, temperature 94°C, sizing rate 11%. Weaving warp tension 210 cN, weft tension 170 cN, opening time 305°, weft insertion time 85°. Hot air treatment temperature 175°C, time 1.5 minutes, speed 28 m / min, shrinkage 4.5%.

[0098] Sidewall: biodegradable polyurethane elastomer material, Shore hardness A75, reinforcement rib diameter 1.2mm, spacing 15mm.

[0099] Bead: Bead wire diameter 1.7mm, copper plating thickness 0.04mm, anti-corrosion coating thickness 0.012mm, polyhydroxyalkanoate to tannic acid mass ratio 3.5:1. Degradable styrene-butadiene rubber glass transition temperature -25°C.

[0100] Other additives: calcium carbonate whisker aspect ratio 40, mass fraction 9%, coverage 84%, pre-dispersion temperature 75°C, time 14 minutes, speed 350r / min.

[0101] Tread pattern: pattern depth 9mm, connecting rib width 4mm, height 2.5mm, pattern groove width 6mm, depth is 0.5 times the pattern depth.

[0102] Manufacturing process

[0103] Raw material preparation: same as Example 1.

[0104] Mixing: Rubber raw materials were mixed at 140℃ for 17 minutes, then mixed for 9 minutes after adding calcium carbonate whiskers, and then mixed at 95℃ for 9 minutes. Mixing was carried out in stages, mixing at 120℃ for 9 minutes, mixing at 150℃ for 8 minutes, and thinning through 5 times.

[0105] Molding: extrusion molding at 125℃.

[0106] Vulcanization: Nitrogen vulcanization, pressure 2.2MPa. The first stage is 13 minutes, pressure 1.5MPa, temperature 158℃; the second stage is 20 minutes, pressure 2.5MPa, temperature 178℃.

[0107] Experimental example:

[0108] Three groups of tires of the same specifications were selected for performance testing, with traditional non-degradable tires used as a comparison. The comparison results are shown in the following table.

[0109] Table 1:

[0110] Test items Example 1 Example 2 Example 3 Comparative Example Tensile strength (MPa) 1500 1800 2000 1200 Degradation rate (1 year, %) 45 50 55 0 Wear resistance index 85 90 88 75 Rolling resistance (N) 120 115 110 150 Environmental protection (VOC emission) Low Very low Very low high Overall tire weight reduction ratio 15％ 12％ 18％ -

[0111] Comparison of the tabular data reveals that the environmentally friendly tires reinforced with biodegradable materials in Examples 1-3 outperform the conventional tires in all performance aspects compared to the comparative examples. While maintaining excellent mechanical properties, the biodegradable tires provided by the present invention significantly improve degradation efficiency (45% to 55% degradation rate within one year) and reduce rolling resistance by approximately 20% to 30%. These tires offer superior environmental performance compared to conventional tires, meeting green manufacturing requirements.

[0112] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly tire reinforced with a biodegradable material, comprising a tire body, wherein the tire body comprises at least a tread, a sidewall, a cord layer, and a bead, and wherein: The tread contains a degradable rubber material, and the degradable rubber material accounts for 20% to 50% of the total mass of the tread. The degradable rubber material contains 10% to 30% of polycaprolactone-modified natural rubber by mass. The tread is prepared by a dynamic vulcanization process, the vulcanizing agent is dicumyl peroxide, the addition amount is 0.5% to 1.5%, the vulcanization temperature is 140 to 160° C., the vulcanization time is 8 to 15 minutes, and the number average molecular weight of the polycaprolactone is 10,000 to 30,000. The cord layer is made of a blend of polylactic acid fiber and bamboo fiber in a mass ratio of 3:1 to 5:

1. The degradable fiber material has a tensile strength of 1000 MPa to 2000 MPa, an elongation at break of 5% to 15%, and a warp-to-weft strength ratio of 1.2 to 1.

5. The sidewall is made of a degradable polyurethane elastomer material with a Shore hardness of A60 to A80; and a reinforcing rib is provided inside the sidewall, and the reinforcing rib is made of degradable polyester fiber; The tire bead includes a tire bead wire and a degradable rubber coating layer. The tire bead wire has a diameter of 1.0 to 2.0 mm, and its surface is copper-plated with a thickness of 0.01 to 0.05 mm. The degradable rubber coating layer is made of degradable styrene-butadiene rubber with a glass transition temperature between -40°C and -20°C.

2. The environmentally friendly tire reinforced with biodegradable materials according to claim 1, characterized in that: The tire body is added with nano-scale calcium carbonate whiskers, whose aspect ratio is 10-50 and whose mass fraction in the tire body is 5%-10%. The calcium carbonate whiskers are surface-modified by a silane coupling agent, whose coverage rate on the surface of the calcium carbonate whiskers is 80%-85%.

3. The environmentally friendly tire reinforced with biodegradable materials according to claim 1, characterized in that: The reinforcing ribs added inside the sidewall have a diameter of 0.5 to 2 mm, and the spacing between the reinforcing ribs is 10 to 30 mm.

4. The environmentally friendly tire reinforced with a degradable material according to claim 1, characterized in that: The cord layer is made by a textile process, and the process steps are as follows: S1、 Soak the polylactic acid fiber in a solution containing a softener and an antistatic agent at 30-40°C for 30-60 minutes, then dehydrate and dry; After scouring for 60 to 90 minutes in a solution containing sodium hydroxide and sodium sulfite at a temperature of 90 to 100°C, the degumming treatment is carried out, and then the degumming treatment is carried out, and ... According to the mass ratio of (3:1) to (5:1), polylactic acid fiber and bamboo fiber are grabbed by a cotton grabber, and then opened, combed, loosened, and mixed to form uniform cotton strips. S2、 The yarn made from the cotton strips prepared in S1 is wound in parallel onto a warp beam, with the warping speed controlled at 400-600 m / min and the tension difference controlled at ±5 cN. An environmentally friendly starch-polyvinyl alcohol mixed slurry is used for sizing, with a slurry concentration of 10-15%, a temperature of 90-95°C, and a sizing rate controlled at 8-12%. According to the requirements of the warp and weft strength ratio, a rapier loom is used for weaving, with the weaving parameters being a warp tension of 180-220 cN, a weft tension of 150-180 cN, an opening time of 280-310°, and a weft insertion time of 70-90°. S3、 The fabric woven by S2 is treated in hot air at 160-180℃ for 1-3 minutes at a speed of 20-30 m / min, and then pre-shrunk by a mechanical pre-shrinking machine with the pre-shrinkage rate controlled at 3-5%. After finishing, the performance indicators of the cord are tested by an electronic universal material testing machine.

5. The environmentally friendly tire reinforced with biodegradable materials according to claim 1, characterized in that: The tread pattern adopts an asymmetric design with a pattern depth of 6 to 10 mm; the shape of the pattern block is an irregular polygon, and adjacent pattern blocks are connected by connecting ribs with a width of 2 to 5 mm and a height of 1 to 3 mm; the width of the pattern groove is 3 to 8 mm, and the depth is 0.5 to 0.8 times the pattern depth.

6. The environmentally friendly tire reinforced with a degradable material according to claim 1, characterized in that: The copper-plated layer of the tire bead wire is coated with a degradable bio-based anti-corrosion coating with a coating thickness of 0.005 to 0.015 mm. The anti-corrosion coating is composed of a complex of polyhydroxyalkanoate and tannic acid with a mass ratio of 2:1 to 4:

1.

7. A process for manufacturing an environmentally friendly tire reinforced with a degradable material, using the environmentally friendly tire reinforced with a degradable material according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Prepare the ingredients Accurately weigh polycaprolactone modified natural rubber, polylactic acid fiber, bamboo fiber, degradable polyurethane elastomer material, degradable styrene-butadiene rubber, calcium carbonate whiskers, silane coupling agent and other raw materials according to the proportion; Step 2: Mixing Put polycaprolactone modified natural rubber and other rubber raw materials into an internal mixer, mix them at 120-150°C for 10-20 minutes, then add calcium carbonate whiskers in sequence and continue mixing for 5-10 minutes; then carry out open mixing, control the open mixing temperature at 80-100°C and the mixing time for 5-10 minutes; Step 3: Molding The mixed rubber material is extruded through an extruder at an extrusion temperature of 100-130°C to form semi-finished products of tread, sidewall, cord layer and bead. The semi-finished products are combined and placed in a vulcanizer for vulcanization at 150-180°C for 20-40 minutes.

8. The environmentally friendly tire reinforced with a biodegradable material according to claim 7, characterized in that: During the banburying process of step 2, a staged heating method is adopted, first banburying at 120° C. for 5 to 10 minutes, then heating to 150° C. and continuing banburying for 5 to 10 minutes; a thin-pass process is adopted during the initial banburying, and the number of thin-passes is 3 to 5 times.

9. The manufacturing process of the environmentally friendly tire reinforced with a degradable material according to claim 7, characterized in that: During the banburying process of step 2, the added calcium carbonate whiskers need to be pre-dispersed with the silane coupling agent before banburying. The pre-dispersion temperature is 60-80° C., the time is 10-15 minutes, and the mixing speed is 200-400 r / min.

10. The manufacturing process of the environmentally friendly tire reinforced with a degradable material according to claim 7, characterized in that: During the vulcanization process of step 3, nitrogen vulcanization technology is used, the vulcanization pressure is controlled at 1.5-2.5 MPa, and the vulcanization time is adjusted in stages according to the tire specifications: The first stage: 10-15 minutes, pressure 1.5 MPa, temperature 150-160°C; The second stage: 10 to 25 minutes, pressure 2.0 to 2.5 MPa, temperature 170 to 180°C.

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