Triangular adhesive tape sizing material composition, mixing method and triangular adhesive tape prepared from triangular adhesive tape sizing material composition

Abstract

The invention relates to the technical field of triangular adhesive tape preparation, in particular to a triangular adhesive tape sizing material composition, a mixing method and a triangular adhesive tape prepared from the triangular adhesive tape sizing material composition. According to the invention, by utilizing an efficient mechanical desulfurization technology and a reasonable formula design, the regenerated rubber can be combined with the natural rubber, and the high-performance rubber material suitable for the triangular adhesive tape is prepared. The rubber material not only can meet the requirements of high strength and wear resistance in mechanical transmission, but also can significantly reduce the production cost by using a large amount of regenerated rubber, and has significant environmental benefits.

Description

Technical Field

[0001] The invention relates to the technical field of triangular tape preparation, and in particular to a triangular tape rubber composition, a mixing method and a triangular tape prepared thereby. Background Art

[0002] V-belt is an important component widely used in mechanical transmission systems, especially in industrial equipment, automobiles, agricultural machinery and other fields. Traditional V-belt is usually made of natural rubber and synthetic rubber to meet the requirements of high strength, high wear resistance and long life. However, with the rapid development of industry and the increasingly serious environmental problems, the production of rubber products is facing the dual pressure of resource shortage and environmental pollution.

[0003] In the current rubber products industry, the production of triangular tapes usually relies on new rubber materials, which leads to large resource consumption and high costs. In addition, a large number of waste rubber products (such as waste tires, waste rubber belts, etc.) are not effectively recycled, causing serious environmental pollution. Therefore, how to regenerate waste rubber resources and prepare high-performance rubber products has become a technical problem that the industry needs to solve urgently.

[0004] In order to meet this challenge, in recent years, recycled rubber technology has gradually developed and applied to the production of rubber products. By desulfurizing and regenerating waste rubber, the elasticity and mechanical properties of some rubber can be restored, reducing production costs and reducing environmental impact. However, traditional recycled rubber processing methods mostly use chemical desulfurization or high-temperature heat treatment, which has low processing efficiency, high energy consumption, and may cause secondary pollution to the environment.

[0005] In order to solve the above problems, high shear mechanical desulfurization technology has gradually been introduced into the field of rubber recycling. This technology effectively destroys the vulcanized cross-linking bonds in the rubber at a lower temperature and restores its plasticity through the synergistic effect of mechanical shear force and chemical additives. In particular, combined with compound chemical desulfurization additives (invention patent application applied by the applicant, application number: 202411430530X application date: 20241014), it can significantly improve the performance of recycled rubber, so that it can still maintain excellent mechanical properties and durability after mixing with natural rubber or synthetic rubber. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes a triangular tape rubber composition based on waste rubber and a mixing method thereof, which utilizes efficient mechanical desulfurization technology and reasonable formula design to combine recycled rubber with natural rubber to prepare a high-performance rubber suitable for triangular tape. This rubber can not only meet the high strength and wear resistance requirements in mechanical transmission, but also significantly reduce production costs by using a large amount of recycled rubber, and has significant environmental benefits.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A triangular tape rubber material composition is prepared by mixing the following raw materials based on 100 parts of the rubber component: Natural rubber: 30-80 parts; Recycled rubber: 20-70 parts; Carbon black: 20-70 parts; White carbon black: 10-30 parts; Silane coupling agent: 2-5 parts; Softener: 5-10 parts; Zinc oxide: 2-5 parts; Stearic acid: 1.0-3.0 parts; Sulfur: 2.0-3.0 parts; Vulcanization accelerator: 1.0-2.0 parts; Antiaging agent: 1.0-2.0 parts; The recycled rubber and the waste rubber are treated by high shear mechanical desulfurization equipment, and the mechanical desulfurization treatment is carried out under the conditions of a shear rate of 500-1500 rpm, a temperature of 140-180°C, and a pressure of 2-5 MPa, and the treatment time is 15-30 minutes; a compound chemical desulfurization aid is added during the treatment, and the compound chemical desulfurization aid includes, based on 100 parts of the waste rubber, 1-butyl-3-methylimidazole hexafluorophosphate: 1.0-2.0 phr; chemical desulfurizer: 1.0-3.0 phr; plasticizer: 2.0-4.0 phr; compatibilizer: 0.5-1.5 phr.

[0008] The waste rubber described in the present invention mainly includes waste automobile tires, waste engineering vehicle tires, conveyor belts, and scraps and waste generated in the production process of rubber products.

[0009] Preferably, the triangular tape rubber composition is prepared by mixing the following raw materials based on 100 parts of the rubber component: Natural rubber: 60-80 parts; Recycled rubber: 20-40 parts; Carbon black: 40-50 parts; White carbon black: 15-20 parts; Silane coupling agent: 2-5 parts; Softener: 5-10 parts; Zinc oxide: 2-5 parts; Stearic acid: 1.0-3.0 parts; Sulfur: 2.0-3.0 parts; Vulcanization accelerator: 1.0-2.0 parts; Anti-aging agent: 1.0-2.0 parts.

[0010] Preferably, the high shear mechanical desulfurization equipment is a twin-screw extruder or a high shear internal mixer.

[0011] Preferably, the chemical desulfurizer is a combination of dibenzothiazole disulfide and a thiol compound; preferably, the thiol compound includes a mixture of one or more of thioglycolic acid, dipropionic acid disulfide, 2-mercaptoethanol, mercaptoethylamine, thioacetamide and mercaptobenzothiazole.

[0012] Preferably, the plasticizer is epoxidized vegetable oil or a citrate plasticizer; preferably, the citrate plasticizer is selected from one or a mixture of triethyl citrate, triethyl acetyl citrate, tributyl citrate, acetyl tributyl citrate, triisononyl citrate, tri(2-ethylhexyl) citrate, and triisooctyl citrate.

[0013] Preferably, the compatibilizer is one or more of a silane coupling agent, a titanate coupling agent, and a zirconate coupling agent; preferably, the compatibilizer is a silane coupling agent Si69.

[0014] The triangle tape rubber composition according to claim 1 is characterized in that the carbon black is N330 type or N550 type, and the softener is aromatic oil, terpene resin or a mixture thereof.

[0015] Preferably, the vulcanization accelerator is selected from one or more of accelerator CZ, accelerator DM, and accelerator TMTD; the antioxidant is selected from one or two of antioxidant 4010 and antioxidant RD.

[0016] Furthermore, the present invention also provides a method for mixing the triangle tape rubber composition, which comprises the following steps: a) Adding waste rubber and compound chemical desulfurization aid into high shear mechanical desulfurization equipment for mechanical desulfurization treatment, the desulfurization conditions are temperature 140-180°C, shear rate 500-1500 rpm, pressure 2-5 MPa, and time 15-30 minutes; b) Recycled rubber and natural rubber are mixed in a ratio of 20-70%:30-80%, and carbon black, white carbon black, softener and ingredients other than vulcanizer and vulcanization accelerator are added; the mixture is kneaded in an internal mixer at 140-160°C for 5-10 minutes to ensure that all ingredients are fully mixed and uniformly formed into a homogeneous rubber compound; c) The vulcanizing agent and the vulcanization accelerator are continuously mixed in the internal mixer to form a homogeneous rubber compound.

[0017] d) Extruding and tableting to obtain the triangle tape rubber composition.

[0018] Furthermore, the present invention also provides a triangular tape, which is prepared by vulcanizing the triangular tape rubber composition.

[0019] Due to the adoption of the above technical solution, the present invention provides an economical, efficient, environmentally friendly and sustainable method for preparing triangular tape rubber, which combines the advantages of efficient utilization of recycled rubber and high-performance materials, not only improves the mechanical properties, anti-aging properties and durability of the product, but also significantly reduces the production cost, and has broad application prospects and economic value. Specifically, it has the following significant technical effects: 1. Efficient desulfurization, improving the regeneration performance of waste rubber: Through high-shear mechanical desulfurization technology combined with compound chemical desulfurization additives, the vulcanization cross-linking bonds in waste rubber are effectively destroyed to restore its plasticity. Compared with traditional chemical or mechanical treatment methods, the present invention achieves efficient desulfurization under mild conditions (temperature 140-180°C, shear rate 500-1500 rpm), reduces energy consumption and the use of chemicals, and significantly improves the recycling effect of waste rubber.

[0020] 2. Synergistic effect of compound chemical desulfurization aid: The compound chemical desulfurization aid in the present invention includes 1-butyl-3-methylimidazolium hexafluorophosphate, chemical desulfurizer, plasticizer and compatibilizer, which further improves the desulfurization efficiency through synergistic effect. In particular, 1-butyl-3-methylimidazolium hexafluorophosphate can not only effectively break the vulcanization cross-linking bonds of rubber, but also improve the compatibility of waste rubber and new rubber, ensuring the uniformity and processing performance of the mixed rubber.

[0021] 3. Enhance compatibility and improve mechanical properties: The present invention effectively improves the compatibility of waste rubber and new rubber (such as natural rubber or synthetic rubber) during the mixing process by adding a compatibilizer (such as silane coupling agent Si69), ensuring the uniform combination of waste rubber and new rubber materials, avoiding the phenomenon of mutual stratification or uneven mixing of rubber, and further improving the mechanical properties of the final product.

[0022] 4. Significant environmental benefits: The present invention reduces dependence on new rubber and reduces resource consumption in the production process of rubber products by recycling waste rubber. At the same time, the compound chemical additive system used has green and environmentally friendly characteristics, reduces pollution to the environment, and meets the environmental protection requirements of modern industry.

[0023] 5. Reduce production costs: Due to the use of a large amount of waste rubber as raw material, combined with efficient desulfurization treatment, the preparation method of the present invention can significantly reduce the production cost of triangular tape, while ensuring the high performance of recycled rubber through reasonable formula design. This provides an economical and efficient solution for the production of triangular tape. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0025] Example 1 1. Recipe: Natural rubber: 50 parts Recycled rubber: 50 parts Carbon black (N330): 45 parts White carbon black: 15 parts Silane coupling agent Si69: 3.0 parts Softener (aromatic oil): 7.0 parts Zinc Oxide: 4.0 parts Stearic acid: 2.0 parts Sulfur: 2.5 parts Vulcanization accelerator CZ: 1.5 parts Antiaging agent 4010: 1.5 parts.

[0026] 2. Preparation process: 1) The waste rubber was subjected to high shear mechanical desulfurization at 150°C, a shear rate of 1000 rpm, a pressure of 3 MPa, and a treatment time of 20 minutes. The compound chemical desulfurization aid included 1.5 parts of 1-butyl-3-methylimidazolium hexafluorophosphate, 1.5 parts of dibenzothiazole disulfide, 3.0 parts of epoxidized vegetable oil, and 1.0 parts of silane coupling agent.

[0027] 2) Recycled rubber and natural rubber are mixed in proportion, and carbon black, white carbon black, softener and ingredients other than vulcanizer and vulcanization accelerator are added; the mixture is mixed in an internal mixer at 150°C for 5-10 minutes to ensure that all ingredients are fully mixed and uniformly formed into a homogeneous rubber compound; 3) The vulcanizer and vulcanization accelerator continue to be mixed in the internal mixer to form a homogeneous rubber compound.

[0028] 4) Extruding and tableting to obtain the triangle tape rubber composition; 5) Vulcanize at 155°C for 30 minutes to obtain a triangular tape rubber sample.

[0029] Example 2 1. Recipe: Natural rubber: 40 parts Recycled rubber: 60 parts Carbon black (N330): 40 parts White carbon black: 20 parts Silane coupling agent Si69: 4.0 parts Softener (terpene resin): 8.0 parts Zinc Oxide: 3.0 parts Stearic acid: 2.0 parts Sulfur: 2.3 parts Vulcanization accelerator DM: 1.0 part Antiaging agent RD: 1.0 part.

[0030] 2. Preparation process As shown in Example 1.

[0031] Example 3 1. Recipe: Natural rubber: 60 parts Recycled rubber: 40 parts Carbon black (N550): 50 parts White carbon black: 10 parts Silane coupling agent Si69: 2.5 parts Softener (aromatic oil): 6.0 parts Zinc Oxide: 2.5 parts Stearic acid: 1.5 parts Sulfur: 2.0 parts Vulcanization accelerator TMTD: 1.0 part Antiaging agent 4010: 1.2 parts.

[0032] 2. Preparation process As shown in Example 1.

[0033] Comparative Example 1 The compound chemical desulfurization additive is replaced by the following formula: MBTS: 2.0 phr Epoxidized vegetable oil: 3.0phr Silane coupling agent Si69: 1.0phr.

[0034] Other technical solutions are shown in Example 1.

[0035] Comparative Example 2 The compound chemical desulfurization additive is replaced by the following formula: 1-Butyl-3-methylimidazolium hexafluorophosphate: 1.2 phr.

[0036] Other technical solutions are shown in Example 1.

[0037] Comparative Example 3 The compound chemical desulfurization additive is replaced by the following formula: 1-Butyl-3-methylimidazolium hexafluorophosphate: 1.5 parts Dibenzothiazyl disulfide (MBTS): 1.5 parts Epoxidized vegetable oil: 3.0 parts.

[0038] Other technical solutions are shown in Example 1.

[0039] Comparative Example 4 The waste rubber was subjected to high-temperature mechanical desulfurization without chemical desulfurization aids. The temperature was set at 180 °C, the shear rate was 1000 rpm, and the desulfurization time was 30 minutes.

[0040] Other technical solutions are shown in Example 1.

[0041] The following is the test data of triangle tape: Example / Comparative Example Tensile strength(MPa) Tear strength (kN / m) Elongation at break (%) Hardness (Shore A) Wear resistance (volume loss mm³) Example 1 17.8 48 420 65 125 Example 2 18.5 50 430 66 120 Example 3 19.0 52 440 67 115 Comparative Example 1 12.5 35 350 60 160 Comparative Example 2 15.0 41 395 58 145 Comparative Example 3 16.6 43 434 62 139 Comparative Example 4 11.0 30 340 58 175 According to the experimental data of the above triangular tape, the performance of the embodiment and the comparative example is significantly different, and the specific analysis is as follows: 1. Tensile strength The tensile strengths of Examples 1-3 are 17.8 MPa, 18.5 MPa and 19.0 MPa, respectively, which are significantly higher than those of the comparative examples, especially comparative examples 1 and 4, whose tensile strengths are 12.5 MPa and 11.0 MPa, respectively.

[0042] This shows that in the present invention, the reclaimed rubber treated with high shear mechanical desulfurization and the compound chemical desulfurization aid can significantly improve the tensile strength of the rubber. When the reclaimed rubber is mixed with natural rubber, the addition of a compatibilizer (such as silane coupling agent Si69) improves the bonding force between rubber molecules, thereby improving the tensile strength.

[0043] 2. Tear strength The tear strength of the embodiments is generally between 48-52 kN / m, showing excellent tear resistance, while the tear strength of the comparative examples is between 30-42 kN / m, especially comparative example 4, the tear strength is only 30 kN / m.

[0044] The difference in tear strength shows that the use of compound chemical devulcanization aids and efficient devulcanization treatment of recycled rubber are key factors in improving the tear strength of rubber compounds, especially under the synergistic effect of silane coupling agents, which better combine recycled rubber with natural rubber and provide higher tear strength.

[0045] 3. Elongation at break The elongation at break of the embodiment is between 420-440%, which is significantly better than that of the comparative example (340-400%).

[0046] High elongation at break indicates that the rubber has good flexibility and ductility. The compound chemical desulfurization additive and high shear mechanical desulfurization technology can destroy the rubber cross-linking bonds while maintaining the mechanical properties of the rubber, improve the plasticity of the rubber, and restore the elasticity of the recycled rubber. In contrast, the comparative samples that did not use compound additives or did not undergo effective desulfurization had poor elasticity and toughness, as shown by a lower elongation at break.

[0047] 4. Hardness (Shore A) The hardness of the embodiment is between 65-67, slightly higher than that of the comparative example (58-61). The improvement of hardness shows that through the reasonable formulation design of reinforcing agent (such as carbon black, white carbon black) and softener, the rubber material not only maintains good flexibility, but also has high compression and deformation resistance, which is suitable for manufacturing triangular tape used under high load conditions.

[0048] The hardness of the comparative examples is relatively low, especially comparative example 4. In the case of no effective chemical desulfurization, the hardness of the rubber is relatively low, which is manifested as poor compressive resistance.

[0049] 5. Wear resistance The wear resistance (volume loss) of the embodiment is between 115-125 mm³, showing strong wear resistance. The wear resistance of the comparative example is poor, especially the volume loss of comparative example 4 reaches 175 mm³, showing low wear resistance.

[0050] The reclaimed rubber after high shear mechanical desulfurization and compound chemical additives can effectively restore its physical properties and form a good mixture with natural rubber. The wear resistance of the rubber is enhanced through reasonable formulation (such as the reinforcement of carbon black and white carbon black). This is especially important for triangular tapes that need to be used for a long time. The comparative samples with poor wear resistance have large volume loss and short service life.

[0051] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A triangular tape rubber composition, characterized in that: The triangular tape rubber material composition is prepared by mixing the following raw materials based on 100 parts of the rubber component: Natural rubber: 30-80 parts; Recycled rubber: 20-70 parts; Carbon black: 20-70 parts; White carbon black: 10-30 parts; Silane coupling agent: 2-5 parts; Softener: 5-10 parts; Zinc oxide: 2-5 parts; Stearic acid: 1.0-3.0 parts; Sulfur: 2.0-3.0 parts; Vulcanization accelerator: 1.0-2.0 parts; Anti-aging agent: 1.0-2.0 parts; The regenerated rubber is treated with waste rubber through high shear mechanical desulfurization equipment, and the mechanical desulfurization treatment is carried out under the conditions of a shear rate of 500-1500rpm, a temperature of 140-180°C, and a pressure of 2-5 MPa, and the treatment time is 15-30 minutes; A compound chemical desulfurization aid is added during the treatment, and the compound chemical desulfurization aid includes, based on 100 parts of waste rubber, 1-butyl-3-methylimidazolium hexafluorophosphate: 1.0-2.0 phr; chemical desulfurizer: 1.0-3.0 phr; plasticizer: 2.0-4.0 phr; compatibilizer: 0.5-1.5 phr.

2. A triangle tape rubber composition according to claim 1, characterized in that: The triangular tape rubber material composition is prepared by mixing the following raw materials based on 100 parts of the rubber component: Natural rubber: 60-80 parts; Recycled rubber: 20-40 parts; Carbon black: 40-50 parts; White carbon black: 15-20 parts; Silane coupling agent: 2-5 parts; Softener: 5-10 parts; Zinc oxide: 2-5 parts; Stearic acid: 1.0-3.0 parts; Sulfur: 2.0-3.0 parts; Vulcanization accelerator: 1.0-2.0 parts; Anti-aging agent: 1.0-2.0 parts.

3. The triangle tape rubber composition according to claim 1, characterized in that: The high shear mechanical desulfurization equipment is a twin-screw extruder or a high shear internal mixer.

4. The triangle tape rubber composition according to claim 1, characterized in that: The chemical desulfurizer is a combination of dibenzothiazole disulfide and a thiol compound; preferably, the thiol compound includes a mixture of one or more of thioglycolic acid, dipropionic acid disulfide, 2-mercaptoethanol, mercaptoethylamine, thioacetamide and mercaptobenzothiazole.

5. The triangle tape rubber composition according to claim 1, characterized in that: The plasticizer is epoxidized vegetable oil or a citrate plasticizer; preferably, the citrate plasticizer is selected from one or a mixture of triethyl citrate, triethyl acetyl citrate, tributyl citrate, acetyl tributyl citrate, triisononyl citrate, tri(2-ethylhexyl) citrate, and triisooctyl citrate.

6. The triangle tape rubber composition according to claim 1, characterized in that: The compatibilizer is one or more of a silane coupling agent, a titanate coupling agent, and a zirconate coupling agent; preferably, the compatibilizer is a silane coupling agent Si69.

7. The triangle tape rubber composition according to claim 1, characterized in that: The carbon black is N330 or N550, and the softener is aromatic oil, terpene resin or a mixture thereof.

8. The triangle tape rubber composition according to claim 1, characterized in that: The vulcanization accelerator is selected from one or more of accelerator CZ, accelerator DM and accelerator TMTD; the antioxidant is selected from one or two of antioxidant 4010 and antioxidant RD.

9. The mixing method of the triangle tape rubber composition according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: a) Adding waste rubber and compound chemical desulfurization aid into high shear mechanical desulfurization equipment for mechanical desulfurization treatment, the desulfurization conditions are temperature 140-180°C, shear rate 500-1500 rpm, pressure 2-5 MPa, and time 15-30 minutes; b) Recycled rubber and natural rubber are mixed in a ratio of 20-70%:30-80%, and carbon black, white carbon black, softener and ingredients other than vulcanizer and vulcanization accelerator are added; the mixture is kneaded in an internal mixer at 140-160°C for 5-10 minutes to ensure that all ingredients are fully mixed and uniformly formed into a homogeneous rubber compound; c) The vulcanizing agent and the vulcanization accelerator are continuously mixed in the internal mixer to form a homogeneous rubber compound; d) Extruding and tableting to obtain the triangle tape rubber composition.

10. A triangular tape, characterized in that: The triangular tape is prepared by vulcanizing the triangular tape rubber composition described in any one of claims 1 to 8.