Anti-aging high-strength reclaimed rubber and preparation method thereof

Abstract

The invention provides anti-aging high-strength reclaimed rubber and a preparation method thereof, and relates to the field of rubber materials. The reclaimed rubber comprises the following components in percentage by weight: 1.6% of aging-120, 1301% of 1301, 0.5% of 4010 (IPPD), 15% of a softening agent and 81.9% of reclaimed rubber powder. The preparation process comprises the steps of mixing, vulcanizing, rubber mixing, refining and forming. The mixing step ensures that all the components are uniformly distributed, and then the vulcanization process at 140-160 DEG C is carried out, so that the material is uniformly crosslinked, and the strength is enhanced. After vulcanization, the rubber mixing temperature is controlled to be 90-110 DEG C, the performance of the material is further improved, then refining is carried out at 100 DEG C, impurities are removed, and the anti-aging performance is enhanced. And finally, the forming temperature is controlled to be 120-150 DEG C, and the dimensional stability and the surface smoothness of the product are ensured. Experiments show that the reclaimed rubber disclosed by the invention has excellent tensile strength, elongation at break, aging resistance and the like. By optimizing the formula and introducing the softener, the flexibility and processability of the material are remarkably improved, and the material can be suitable for the production process of extruded rubber products.

Description

Technical Field

[0001] The invention relates to the field of rubber materials, and in particular to an aging-resistant high-strength reclaimed rubber and a preparation method thereof. Background Art

[0002] As an environmentally friendly material, recycled rubber has significant economic and environmental benefits by reusing waste rubber. However, existing recycled rubber materials often have problems such as poor aging resistance, insufficient mechanical strength, and unstable vulcanization process during use. For example, traditional recycled rubber is prone to aging in external environments such as oxygen and ozone, resulting in a decrease in material performance, limiting its application in fields with higher requirements. Existing rubber material technology still has the following defects: The purpose of the present invention is to provide a high-strength reclaimed rubber that is resistant to aging. Through a reasonable formula and preparation process, the reclaimed rubber has excellent aging resistance and mechanical strength, thus overcoming the deficiencies in the prior art. Summary of the invention

[0003] The main purpose of the present invention is to provide an aging-resistant high-strength regenerated rubber and a preparation method thereof, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is: The composition of reclaimed rubber includes the following components in weight percentage: Recycled rubber powder: 81.9% Softener: 15% Aging-120 (anti-aging agent): 1.6% 130 (anti-aging agent): 1% N-isopropyl-N'-phenyl-p-phenylenediamine: 0.5%.

[0005] Further, step S1: mixing recycled rubber powder, softener, aging-120, 130, and N-isopropyl-N'-phenyl-p-phenylenediamine in proportion; Step S2: performing vulcanization treatment at a suitable vulcanization temperature; Step S3: the vulcanized rubber material is subjected to rubber refining treatment; Step S4: refining the rubber after rubber mixing; Step S5: molding the refined rubber material to obtain a final product.

[0006] Furthermore, the N-sec-octyl-N′-phenyl-p-phenylenediamine is added to enhance the anti-aging performance of the rubber compound.

[0007] Furthermore, the N-isopropyl-N′-phenyl-p-phenylenediamine is used as an antioxidant to prevent aging caused by oxidation.

[0008] Furthermore, the temperature range of the vulcanization treatment is 140°C to 160°C. Furthermore, the time of the rubber mixing process is 10 minutes to 20 minutes.

[0009] Furthermore, the refining process includes mixing and homogenizing at a temperature of 80°C to 120°C.

[0010] Furthermore, the molding process includes heating the refined rubber material to 120° C. to 150° C. for compression molding.

[0011] Compared with the prior art, the present invention has the following advantages: The present invention significantly improves the anti-aging performance and mechanical strength of the reclaimed rubber by introducing softeners and anti-aging agents aging-120, 130 and N-isopropyl-N'-phenyl-p-phenylenediamine (4010, IPPD) into the reclaimed rubber. Compared with the traditional formula, the present invention deletes other types of anti-aging agents and increases the softener by 15%. This optimized formula not only improves the flexibility of the reclaimed rubber, but also further improves its processing performance and durability.

[0012] Anti-aging agents aging-120, 130 and 4010, IPPD can effectively inhibit the oxidation reaction of unsaturated groups in rubber, delay the aging process, and prevent the reclaimed rubber from cracking, whitening and other aging phenomena in harsh environments. In this way, even in long-term use, the reclaimed rubber can still maintain good physical properties.

[0013] The introduction of softeners greatly improves the flexibility and fluidity of reclaimed rubber, making its processing smoother and reducing production energy consumption and equipment wear. At the same time, the optimized vulcanization process ensures the uniform cross-linking structure of the material, ensuring that the finished product has excellent stability and consistency.

[0014] The present invention uses recycled rubber powder as the main matrix material, and introduces a reasonable proportion of softener (15%) and anti-aging agents aging-120, 130, 4010, IPPD to significantly improve the anti-aging performance and mechanical strength of the recycled rubber, especially in terms of tensile strength and elongation at break. DETAILED DESCRIPTION

[0015] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and is not a limitation of the scope of protection, applicability or examples set forth in the claims. The functions and arrangements of the elements discussed can be changed without departing from the scope of protection of the contents of this specification. Various examples can omit, replace or add various processes or components as needed. For example, the described method can be performed in an order different from the described order, and various steps can be added, omitted or combined. In addition, the features described relative to some examples can also be combined in other examples.

[0016] As used herein, the term "including" and its variations represent open terms, meaning "including but not limited to". The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other definitions may be included below, whether explicit or implicit. Unless the context clearly indicates otherwise, the definition of a term is consistent throughout the specification.

[0017] The present invention provides a technical solution, and the specific technology is as follows: Recycled rubber powder: 81.9% Softener: 15% Aging-120 (anti-aging agent): 1.6% 130 (anti-aging agent): 1% N-isopropyl-N'-phenyl-p-phenylenediamine: 0.5%.

[0018] Example 1: Preparation of high-strength regenerated rubber with aging resistance Raw material preparation: Prepare the raw materials according to the following weight percentages: Recycled rubber powder: 81.9% Softener: 15% Aging-120 (anti-aging agent): 1.6% 130 (anti-aging agent): 1% N-isopropyl-N'-phenyl-p-phenylenediamine: 0.5% Mixing steps: After weighing the above raw materials according to the proportion, add them into the mixer and stir and mix them at room temperature for 5 minutes to ensure that all ingredients are evenly distributed in the recycled rubber powder.

[0019] Vulcanization steps: The mixed rubber is placed in a vulcanizer for vulcanization. The vulcanization temperature is set at 150°C and the vulcanization time is 15 minutes. During the vulcanization process, temperature and pressure control cause the components in the rubber to undergo chemical reactions, forming a stable cross-linked structure, thereby improving the mechanical strength and durability of the reclaimed rubber.

[0020] Rubber mixing steps: The vulcanized rubber is transferred to a rubber mixer for 10 minutes of mixing, with the mixing temperature controlled between 90° C. and 110° C. This step further improves the uniformity of the rubber and enhances its physical properties.

[0021] Refining steps: The rubber compound is refined at 100°C for 20 minutes. The purpose of refining is to remove impurities in the rubber compound, improve physical properties, and ensure that the finished product has excellent anti-aging properties and mechanical strength.

[0022] Molding steps: The refined rubber is heated to 120℃ to 150℃ for compression molding, and finally the reclaimed rubber product of the required shape is formed. The molded product is cooled and post-processed to ensure dimensional stability and surface finish.

[0023] Performance Test: Tests show that under the condition of 12MPa tensile strength, the material exhibits good tensile strength; the elongation at break is 450%; the tensile strength retention rate after aging for 72 hours is 85%, and the elongation at break retention rate is 80%.

[0024] Example 2: Effects of different softeners on the properties of reclaimed rubber Raw material ratio adjustment: In this example, the effect of increasing the proportion of softener on the properties of reclaimed rubber is explored. The specific proportion is as follows: Formula A (control group): softener: 10% Formula B (improved group): softener: 15% Preparation method: The vulcanization, rubber mixing, refining and molding processes were carried out according to the steps in Example 1.

[0025] Performance Test: Under the same test conditions, Formula B showed better flexibility and fluidity, with a tensile strength of 12MPa and an elongation at break of 440%, which was slightly higher than that of Formula A (430% elongation at break). The tensile strength retention rate of Formula B in the aging test was 87%, while that of Formula A was 82%.

[0026] Example 3: Effects of different vulcanization conditions on the properties of reclaimed rubber Raw material ratio: The raw materials were mixed according to the ratio in Example 1: 81.9% recycled rubber powder, 15% softener, and aging-120, 130 and 4010 were added in proportion.

[0027] Process parameter adjustment: Study the effects of different vulcanization temperatures and times on the properties of reclaimed rubber. The specific settings are as follows: Formula C: Curing temperature 140°C, curing time 20 minutes Formula D: Curing temperature 160°C, curing time 10 minutes Performance Test: The test results show that the tensile strength of formula D reaches 12MPa and the elongation at break is 430%, while the tensile strength of formula C is 12MPa and the elongation at break is 440%. In the aging test, the tensile strength retention rate of formula D is 85%, while that of formula C is 83%.

[0028] Through various embodiments of the present invention, the excellent performance of the prepared aging-resistant high-strength reclaimed rubber under different applications and process conditions can be systematically demonstrated, which is specifically manifested in the following aspects: 1. Anti-aging performance is significantly improved: The present invention effectively improves the anti-aging performance of the reclaimed rubber by using an optimized combination of anti-aging agents aging-120, 130 and N-isopropyl-N'-phenyl-p-phenylenediamine (4010, IPPD). Combined with the use of softeners, the material exhibits excellent durability and processing performance, ensuring excellent anti-aging performance in long-term use.

[0029] 2. Mechanical strength and wear resistance are significantly enhanced: On the basis of maintaining the anti-aging performance, the present invention improves the mechanical strength and processing performance of the reclaimed rubber by introducing a softener, showing higher tensile strength and wear resistance. This optimized design enables the material to show excellent performance and adaptability in a variety of application scenarios.

[0030] 3. The effect of vulcanization temperature on performance optimization: Studies have shown that at a higher vulcanization temperature (such as 160°C), a higher tensile strength (12MPa) can be achieved in a short time (10 minutes), while maintaining good elongation at break and anti-aging properties. This research result provides an important reference for process optimization and demonstrates the flexibility and operability of the present invention in the production process.

[0031] The technical method in the present invention mainly focuses on the formula optimization and preparation process of reclaimed rubber to achieve the purpose of improving the anti-aging performance, mechanical strength and processing performance of reclaimed rubber.

[0032] Recycled rubber powder: As the main matrix material, the proportion of recycled rubber powder is adjusted to 81.9%, and its role is to carry other additives. By optimizing the formula and process, the recycled rubber powder has similar performance to the original rubber while maintaining high mechanical strength.

[0033] Softener: Add 15% softener to improve the flexibility and processing performance of the material. The addition of softener improves the fluidity of the material, reduces production energy consumption, and makes the surface finish of the finished product higher, meeting the production requirements of high-quality rubber products.

[0034] AGING-120: As an anti-aging agent, AGING-120 improves the material's tolerance to high temperature and oxidative conditions, further enhancing the anti-aging properties.

[0035] 130: The addition of anti-aging agent 130 further enhances the material's aging resistance, especially under high temperature conditions, effectively delaying the material's aging process.

[0036] N-isopropyl-N'-phenyl-p-phenylenediamine: This antioxidant plays a key role in harsh environments, preventing oxygen and ozone from oxidative damage to materials and improving the long-term performance of materials.

[0037] Vulcanization process: The vulcanization process ensures uniform cross-linking of the material by controlling the temperature (140°C to 160°C) and time, significantly improving the strength and durability of the material. The optimization of the vulcanization process improves the mechanical properties and anti-aging ability of the reclaimed rubber.

[0038] Rubber mixing and refining process: Through the rubber mixing and refining process, the various components in the material are further evenly mixed, impurities are removed, and the overall performance of the material is enhanced. This process ensures the uniformity and consistency of the recycled rubber, making it suitable for high-quality application scenarios.

[0039] Molding process: Molding is carried out under appropriate temperature and pressure to ensure the material is in the best state in terms of performance and morphology. The reclaimed rubber products produced have good dimensional stability and surface finish.

[0040] 1. The optimized combination of anti-aging agents aging-120, 130 and N-isopropyl-N'-phenyl-p-phenylenediamine improves anti-aging performance: Antioxidants aging-120, 130 and 4010, IPPD prevent rubber molecules from degrading by capturing free radicals in rubber or inhibiting oxidation reactions. Oxidation is an important cause of rubber aging, and the role of antioxidants is to prevent further expansion of the oxidation chain reaction by reacting with free radicals or oxygen.

[0041] Antioxidant 4010 reacts with free radicals:

[0042] This reaction forms stable products that prevent free radicals from further damaging the rubber molecular chains.

[0043] 2. Softener improves mechanical strength and wear resistance: Softeners improve the fluidity and flexibility of rubber and increase the lubricity between molecules. They do not directly participate in chemical reactions, but they can reduce the cohesion of rubber in a molten state, reduce friction and viscosity during processing, and thus improve processing performance and mechanical properties.

[0044] 3. The effect of vulcanization temperature on performance optimization: The core of the vulcanization process is the cross-linking reaction between rubber molecules and sulfur (S8). At high temperatures, sulfur reacts with the double bonds (C=C) in the rubber molecules to form polysulfide bonds, which cross-link the rubber molecules and improve the strength and elasticity of the material.

[0045] The double bonds in natural rubber (cis-1,4-polyisoprene) undergo crosslinking reactions with sulfur (S8):

[0046] in, It represents the polysulfide bonds introduced by sulfur, which are disulfide bonds or polysulfide bond structures formed by cross-linking. These cross-linking structures enhance the strength and durability of rubber.

[0047] These chemical reaction equations show the key chemical reactions in the preparation process of reclaimed rubber, including vulcanization, antioxidants and anti-ozonants. Through these reactions, high-strength reclaimed rubber with excellent performance and aging resistance is finally obtained.

[0048] The present invention makes full use of waste rubber resources, and successfully prepares high-performance reclaimed rubber materials by optimizing formula design and process control, which not only reduces production costs, but also reduces dependence on virgin rubber resources, and has significant economic and environmental benefits. The research results in the examples show that the reclaimed rubber prepared by the present invention can replace part of the virgin rubber in multiple high-demand fields, further promoting the sustainable development of the rubber industry.

[0049] Those skilled in the art should understand that the various embodiments disclosed above can be changed and modified in various ways without departing from the essence of the invention. Therefore, the protection scope of the present invention should be defined by the appended claims.

[0050] It should be noted that not all steps and units in the above processes are necessary, and some steps or units can be ignored according to actual needs. The execution order of each step is not fixed and can be determined as needed. The device structure described in the above embodiments can be a physical structure or a logical structure, that is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or some components in multiple independent devices may be implemented together.

[0051] The specific embodiments set forth above describe exemplary embodiments, but do not represent all embodiments that may be implemented or fall within the scope of protection of the claims. The term "exemplary" used throughout this specification means "used as an example, instance, or illustration" and does not mean "preferred" or "having advantages" over other embodiments. For the purpose of providing an understanding of the described techniques, the specific embodiments include specific details. However, these techniques may be implemented without these specific details. In some instances, in order to avoid obscuring the concepts of the described embodiments, well-known structures and devices are shown in block diagram form.

[0052] The above description of the present disclosure is provided to enable any person of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of protection of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is consistent with the widest range of principles and novel features disclosed herein.

Claims

1. A high-strength regenerated rubber with aging resistance and a preparation method thereof, Its characteristics are: The composition of reclaimed rubber includes the following components in weight percentage: Recycled rubber powder: 81.9% Softener: 15% Aging-120 (anti-aging agent): 1.6% 130 (anti-aging agent): 1% N-isopropyl-N'-phenyl-p-phenylenediamine: 0.5%.

2. The aging-resistant high-strength reclaimed rubber and its preparation method according to claim 1, Its characteristics are: Step S1: mixing recycled rubber powder, softener, aging-120, 130, and N-isopropyl-N'-phenyl-p-phenylenediamine in proportion; Step S2: performing vulcanization treatment at a suitable vulcanization temperature; Step S3: the vulcanized rubber material is subjected to rubber refining treatment; Step S4: refining the rubber after rubber mixing; Step S5: molding the refined rubber material to obtain a final product.

3. The aging-resistant high-strength reclaimed rubber and its preparation method according to claim 1, Its characteristics are: The N-sec-octyl-N′-phenyl-p-phenylenediamine is added to enhance the anti-aging performance of the rubber compound.

4. The aging-resistant high-strength reclaimed rubber and its preparation method according to claim 1, Its characteristics are: The N-isopropyl-N′-phenyl-p-phenylenediamine is used as an antioxidant to prevent aging caused by oxidation.

5. The aging-resistant high-strength reclaimed rubber and its preparation method according to claim 2, Its characteristics are: The temperature range of the sulfurization treatment is 140°C to 160°C.

6. The aging-resistant high-strength reclaimed rubber and its preparation method according to claim 2, Its characteristics are: The time of the rubber mixing process is 10 to 20 minutes.

7. The aging-resistant high-strength reclaimed rubber and its preparation method according to claim 2, Its characteristics are: The refining process includes a mixing and homogenizing process at a temperature of 80°C to 120°C.

8. The aging-resistant high-strength reclaimed rubber and its preparation method according to claim 2, Its characteristics are: The molding process includes heating the refined rubber material to 120° C. to 150° C. for compression molding.

Images