Rubber compound containing recycled oil

Abstract

The embodiment of the invention provides a rubber compound containing recycled oil, and belongs to the field of resource recycling. The rubber compound comprises the following components: a rubber system, the rubber system comprises any one of natural rubber and synthetic rubber or a mixture of the natural rubber and the synthetic rubber, and the mixing ratio of the mixture of the natural rubber and the synthetic rubber ranges from 100: 1 to 1: 100; the reinforcing system comprises carbon black or a mixture of the carbon black and a preset inorganic filler, and the total mass part of the inorganic filler in the reinforcing system is between 10 parts and 70 parts; the plasticizing system comprises any one of aromatic oil, naphthenic oil, paraffin oil and petroleum resin or a mixture of any combination of the aromatic oil, the naphthenic oil, the paraffin oil and the petroleum resin and recycled oil, and the content of the recycled oil in the plasticizing system is between 1 part and 15 parts by mass. The rubber compound can be applied to tires and industrial rubber products.

Description

Technical Field

[0001] The invention belongs to the field of resource recovery and recycling, and in particular relates to a rubber compound containing recycled oil. Background Art

[0002] Scrap tires are shredded into rubber powder. This powder, when subjected to high temperatures or catalytic conditions, can be cracked into combustible gas, recycled oil, and recycled carbon black. Recycled carbon black can be reused in rubber formulations, while recycled oil (or pyrolysis oil) is typically used as a feedstock for clean fuel production or as a carbonaceous feedstock for carbon black production.

[0003] However, recycled oil contains a large amount of light components, which pose a flammable safety risk during use, thus limiting its use in rubber. Beyond safety, plasticizers used in rubber formulations must possess appropriate fluidity or viscosity. Furthermore, the glass transition temperature (GTP) of the plasticizer added to the rubber formulation is equally important; a GTP that is too low or too high can significantly impact the performance of rubber products. Summary of the Invention

[0004] The present invention aims to at least partially solve the above-mentioned technical problems and aims to provide a rubber compound containing recycled oil, which can use recycled oil that meets preset or specific performance requirements in the rubber formulation to produce a desired rubber compound that can be used for tires or other industrial rubber products.

[0005] In one aspect of the present invention, a rubber compound containing recycled oil is provided, wherein the rubber compound comprises the following components: A rubber system comprising any one of natural rubber and synthetic rubber or a mixture thereof, wherein the mixing ratio of the mixture of natural rubber and synthetic rubber ranges from 100:1 to 1:100; A reinforcement system comprising carbon black or a mixture of carbon black and a predetermined inorganic filler, wherein the total amount of the inorganic filler in the reinforcement system is between 10 and 70 parts by weight; A plasticizing system comprising a mixture of any one of aromatic oil, naphthenic oil, paraffin oil and petroleum resin or any combination thereof and recycled oil, wherein the recycled oil in the plasticizing system has a mass fraction of 1 to 15 parts.

[0006] In some embodiments, the recycled oil in the plasticizing system is present in an amount ranging from 2 to 10 parts by weight.

[0007] In some embodiments, the synthetic rubber comprises one or any combination of styrene butadiene rubber, cis-butadiene rubber, butyl rubber, ethylene propylene diene monomer rubber, isoprene rubber, nitrile rubber.

[0008] In some embodiments, the carbon black has a specific surface area between 40 m 2 / g and 150 m 2 / g.

[0009] In some embodiments, the carbon black has a structure between 40 ml / 100g and 140 ml / 100g of OAN oil absorption.

[0010] In some embodiments, the inorganic filler comprises one or any combination of SiO2, CaCO3, Clay.

[0011] In some embodiments, the recycled oil has a flash point between 60℃-220℃; the recycled oil has a kinematic viscosity at 40℃ between 40 cST-140 cST; the recycled oil has a glass transition temperature between -30℃ to -80℃.

[0012] In some embodiments, the recycled oil has a flash point between 100℃-200℃; the recycled oil has a kinematic viscosity at 40℃ between 60 cST-130 cST; the recycled oil has a glass transition temperature between -40℃ to -70℃.

[0013] In some embodiments, the recycled oil has a flash point between 140℃-200℃; the recycled oil has a kinematic viscosity at 40℃ between 80 cST-120 cST; the recycled oil has a glass transition temperature between -50℃ to -65℃.

[0014] A rubber compound containing recycled oil according to embodiments of the present application has at least one of the following advantages: 1. The rubber compound of the present application adds recycled oil with specific properties into the rubber formulation, completely or partially replacing petroleum-based plasticizers, increasing the proportion of sustainable materials in the rubber compound, reducing the carbon footprint of rubber products, while the performance of the rubber compound can be maintained or improved; 2. By adding recycled oil with specific properties to the rubber formula, the rubber composite of the present invention can improve the anti-fracture strength of the rubber composite, specifically manifested in higher breaking strength and elongation at break. This increased performance helps improve the durability of rubber products, especially in harsh environments, such as resistance to cuts and irregular wear. 3. The rubber compound of the present invention further reduces the cost of the rubber compound and improves the economic efficiency of producing tires or industrial rubber products by adding recycled oil that meets specific properties to the rubber formula. DETAILED DESCRIPTION

[0015] As discussed in the background art section, in order to produce rubber products with desired properties, the inventors of the present invention use recycled oil with predetermined properties or meeting specific performance requirements in rubber formulations.

[0016] In an embodiment of the present invention, the rubber compound mainly comprises the following three main components: a rubber system, a reinforcement system and a plasticizer system.

[0017] Specifically, the rubber system comprises any one of natural rubber and synthetic rubber, or a mixture thereof, wherein the mixing ratio of the mixture of natural rubber and synthetic rubber ranges from 100:1 to 1:100. The reinforcement system comprises carbon black or a mixture of carbon black and a predetermined inorganic filler, wherein the total amount of the inorganic filler in the reinforcement system ranges from 10 parts by weight to 70 parts by weight. The plasticizer system comprises a mixture of any one of aromatic oil, naphthenic oil, paraffin oil, and petroleum resin, or any combination thereof, and recycled oil, wherein the recycled oil content in the plasticizer system ranges from 1 part by weight to 15 parts by weight.

[0018] In the rubber system, the synthetic rubber includes one of styrene-butadiene rubber, butadiene rubber, butyl rubber, EPDM rubber, isoprene rubber, and nitrile rubber, or any combination thereof.

[0019] In the reinforcement system, the specific surface area of ​​the carbon black is between 40m 2 / g to 150m 2 / g, and the structure degree is between 40ml / 100g and 140ml / 100g in terms of OAN oil absorption value. The inorganic filler includes one of SiO2, CaCO3, and Clay, or any combination thereof.

[0020] The recycled oil content in the plasticizing system is between 2 and 10 parts by mass; the flash point of the recycled oil is between 60°C and 220°C; the kinematic viscosity of the recycled oil at 40°C is between 40 cST and 140 cST; and the glass transition temperature of the recycled oil is between -30°C and -80°C.

[0021] Preferably, the flash point of the recycled oil is between 100°C and 200°C; the kinematic viscosity of the recycled oil at 40°C is between 60cST and 130cST; and the glass transition temperature of the recycled oil is between -40°C and -70°C.

[0022] More preferably, the flash point of the recycled oil is between 140°C and 200°C; the kinematic viscosity of the recycled oil at 40°C is between 80 cST and 120 cST; and the glass transition temperature of the recycled oil is between -50°C and -65°C.

[0023] It should be noted that the recycled oil used in this invention has been processed to remove light components, resulting in a higher flash point for the recycled oil, thereby enhancing safety. Using high-flash-point recycled oil in rubber formulations promotes safe production. The flash point of the recycled oil used in this invention is between 60°C and 220°C, preferably between 100°C and 200°C, and more preferably between 140°C and 200°C.

[0024] To achieve ideal rubber properties, such as tensile strength and tear strength, the recycled oil used in this invention has a kinematic viscosity between 40 cST and 140 cST, preferably between 60 cST and 130 cST, and more preferably between 80 cST and 120 cST. Similarly, to achieve ideal rubber properties, such as grip, rolling resistance, and wear resistance, the recycled oil used in this invention has a glass transition temperature between -30°C and -80°C, preferably between -40°C and -70°C, and more preferably between -50°C and -65°C.

[0025] The following examples are implemented based on the technical solutions of the present invention and provide detailed implementation methods and specific operating procedures, which will help those skilled in the art further understand the present invention. It should be noted that the scope of protection of the present invention is not limited to the following examples, and various adjustments and improvements made based on the concept of the present invention are also within the scope of protection of the present invention.

[0026] Example 1 - Natural rubber-based formulation test S1. Rubber Compounding Test According to the basic formula in Table 1, the raw materials shown in the formula components were weighed and rubber compounding tests were conducted. First, STR20 rubber and carbon black N220 were added to a 1.5-liter internal mixer and mixed for 50 seconds. Stearic acid, 6PPD, and TDAE or TPO-140 plasticizer were then added and mixed for another minute. Finally, ZnO was added and mixed for another 2 minutes. The masterbatch was discharged below 150°C to obtain a masterbatch. The masterbatch was discharged on an open mixer and cooled. After the masterbatch was allowed to rest for 8 hours, sulfur (S) and accelerator TBBS were added and mixed evenly on the open mixer. The masterbatch was discharged, cooled, and then used.

[0027] S2. Rubber vulcanization The rubber sheet obtained in step S1 is formed into a sample shape according to the test item requirements and placed in a vulcanizer for vulcanization at a temperature of 150 degrees Celsius. The vulcanization time is set according to the measured positive vulcanization time of the rubber compound. After vulcanization, various vulcanized rubber samples that meet the test requirements are obtained.

[0028] S3. Rubber performance test The vulcanized rubber samples obtained in step S2 were tested for hardness, tensile strength, and tearing, and the test results are summarized in Table 2.

[0029]

[0030] Among them, TDAE is a petroleum-based plasticizer and TPO-140 is recycled oil.

[0031]

[0032]

[0033] Example 2 - Formulation test based on styrene-butadiene rubber S1. Rubber Compounding Test According to the basic formula in Table 3, the raw materials shown in the formula components were weighed and the rubber compounding test was carried out. The remaining steps were the same as those described in S1 in Example 1.

[0034]

[0035] Among them, TDAE is a petroleum-based plasticizer and TPO-140 is recycled oil.

[0036] S2. Rubber vulcanization The steps are the same as those described in S2 in Example 1.

[0037] S3. Rubber performance test The vulcanized rubber samples obtained in S2 were tested for hardness, tensile strength, and tearing, and the test results are summarized in Table 4.

[0038]

[0039]

[0040] Example 3 - Characteristics of recycled oil The characteristic indicators of the recycled regenerated oil used in the present invention are shown in Table 5.

[0041]

[0042] The rubber compound containing recycled oil according to an embodiment of the present invention has at least one of the following advantages: 1. The rubber compound of the present invention incorporates recycled oil with specific properties into the rubber formula, completely or partially replacing petroleum-based plasticizers. This increases the proportion of sustainable materials in the rubber compound, reduces the carbon footprint of the rubber product, and maintains or improves the performance of the rubber compound. 2. By adding recycled oil with specific properties to the rubber formula, the rubber composite of the present invention can improve the anti-fracture strength of the rubber composite, specifically manifested in higher breaking strength and elongation at break. This increased performance helps improve the durability of rubber products, especially in harsh environments, such as resistance to cuts and irregular wear. 3. The rubber compound of the present invention further reduces the cost of the rubber compound and improves the economic efficiency of producing tires or industrial rubber products by adding recycled oil that meets specific properties to the rubber formula.

[0043] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims

1. A rubber compound containing recycled oil, wherein the rubber compound comprises the following components: A rubber system comprising any one of natural rubber and synthetic rubber or a mixture thereof, wherein the mixing ratio of the mixture of natural rubber and synthetic rubber ranges from 100:1 to 1:100; A reinforcement system comprising carbon black or a mixture of carbon black and a predetermined inorganic filler, wherein the total amount of the inorganic filler in the reinforcement system is between 10 and 70 parts by weight; A plasticizing system comprising a mixture of any one of aromatic oil, naphthenic oil, paraffin oil and petroleum resin or any combination thereof and recycled oil, wherein the recycled oil in the plasticizing system has a mass fraction of 1 to 15 parts.

2. The rubber compound according to claim 1, characterized in that The recycled oil content in the plasticizing system is between 2 and 10 parts by mass.

3. The rubber compound according to claim 1, characterized in that The synthetic rubber includes one of styrene-butadiene rubber, butadiene rubber, butyl rubber, EPDM rubber, isoprene rubber, and nitrile rubber, or any combination thereof.

4. The rubber compound according to claim 1, characterized in that The specific surface area of ​​the carbon black is between 40m 2 / g to 150m 2 / g.

5. The rubber compound according to claim 4, characterized in that The carbon black has a structure degree ranging from an OAN oil absorption value of 40 ml / 100 g to 140 ml / 100 g.

6. The rubber compound according to claim 1, characterized in that The inorganic filler includes one of SiO2, CaCO3, Clay or any combination thereof.

7. The rubber compound according to any one of claims 1 to 6, characterized in that The flash point of the recycled oil is between 60°C and 220°C; The kinematic viscosity of the recycled oil at 40°C is between 40 cST and 140 cST; The glass transition temperature of the recycled oil is between -30°C and -80°C.

8. The rubber compound according to claim 7, characterized in that The flash point of the recycled oil is between 100°C and 200°C; The kinematic viscosity of the recycled oil at 40°C is between 60 cST and 130 cST; The glass transition temperature of the recycled oil is between -40°C and -70°C.

9. The rubber compound according to claim 8, characterized in that The flash point of the recycled oil is between 140°C and 200°C; The kinematic viscosity of the recycled oil at 40°C is between 80 cST and 120 cST; The glass transition temperature of the recycled oil is between -50°C and -65°C.

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