High-temperature-resistant and low-VOCs motorcycle inner tube formula

Abstract

The invention discloses a formula of a motorcycle inner tube with high temperature resistance and low VOCs (volatile organic compounds). The motorcycle inner tube comprises the following components in parts by weight: 60-90 parts of natural rubber, 64-100 parts of reclaimed rubber, 4-6 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 3-5 parts of an anti-aging agent, 0.8-1.5 parts of microcrystalline wax, 3-5 parts of bonding resin, 0.8-1.5 parts of magnesium aluminum silicate, 0.8-1.5 parts of modified sepiolite, 20-32 parts of carbon black, 40-65 parts of light calcium carbonate, 7-12 parts of aromatic oil, 1.3-2.2 parts of sulfur, 3.5-6 parts of an accelerant CZ / NS and 0.5-1 part of a scorch retarder CTP. According to the motorcycle inner tube rubber material, magnesium aluminum silicate and modified sepiolite are added to achieve a synergistic effect, volatilization and release of low-boiling-point organic matter in the raw materials can be effectively adsorbed and inhibited, a rubber matrix can be reinforced, the mechanical property of the rubber matrix is improved, the effect of isolating thermal oxygen can be achieved, and the thermo-oxidative aging resistance of the rubber material is improved.

Description

Technical Field

[0001] The invention relates to a formula for a motorcycle inner tube and belongs to the technical field of tire manufacturing. Background Art

[0002] Rubber material production is one of the first industries in my country to pilot the emission of volatile organic compounds (VOC) to the atmosphere. Flue gas is generated during the production process in the mixing workshop and the vulcanization workshop. The main components are sulfide and different types of volatile organic compounds such as alkanes, benzenes, and olefins. With the advancement of urbanization and the enhancement of human environmental awareness, people's requirements for the environment are constantly increasing. In particular, in the "Emission Standards of Pollutants for Rubber Products Industry" (GB 27623-2011), the impact of flue gas on the environment is further clarified. Today, flue gas treatment has become imminent.

[0003] When a motorcycle is driving on the road, the tire will inevitably heat up, and the temperature inside the tire will rise, which will also cause the temperature of the inner tube to change dramatically. The heating of the tire will not directly affect the driving of the vehicle, nor will it cause the tire to melt, but the heating problem of the tire will indirectly affect the driving safety of the vehicle. When a motorcycle is driving at high speed, the friction between the tire and the ground is intense, and the heat is generated very quickly and accumulates continuously. The thermal expansion and contraction will increase the inner tube pressure, and excessive tire pressure will easily cause a tire blowout. Relevant data show that tire problems account for 46% of the causes of motorcycle accidents, and tire blowouts account for 70% of tire problems. The seriousness of the tire heating problem is obvious.

[0004] Magnesium aluminum silicate is a derivative of silicon oxide with high magnesium content. It has a very large specific surface area, a very developed microporous system, and good compatibility with natural rubber and synthetic rubber. It can be used as an absorbent and adsorbent in the production of rubber materials, effectively absorbing and inhibiting the volatilization and release of low-boiling organic matter in the raw materials. Sepiolite is a hydrous iron-rich silicate clay mineral with a layered chain structure. It has low shrinkage, good plasticity, large specific surface area, strong adsorption, and good thermal insulation and thermal stability. Modified sepiolite has a special lamellar or needle-like structure, which can effectively inhibit the penetration of oxygen molecules during the oxidation process and has a good barrier effect on heat and oxygen. At the same time, it has strong adsorption and inhibits the chain reaction, so that sepiolite can effectively improve the thermal oxidation stability of composite rubber, and can be evenly dispersed in the rubber matrix to reinforce the rubber matrix. Under the synergistic effect of modified sepiolite and magnesium aluminum silicate, it can not only effectively adsorb and inhibit the volatilization release of low-boiling point organic matter in the raw materials, but also reinforce the rubber matrix and improve its mechanical properties. It can also isolate heat and oxygen and improve the rubber material's resistance to heat and oxygen aging. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a high temperature resistant, low VOCs motorcycle inner tube formula.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: The present invention provides a high temperature resistant, low VOCs motorcycle inner tube formula, comprising the following components in parts by weight: Natural rubber: 60-90, reclaimed rubber: 64-100, zinc oxide: 4-6, stearic acid: 1.5-2.5, antioxidant: 3-5, microcrystalline wax: 0.8-1.5, adhesive resin: 3-5, magnesium aluminum silicate: 0.8-1.5, modified sepiolite: 0.8-1.5, carbon black: 20-32, light calcium: 40-65, aromatic oil: 7-12, sulfur: 1.3-2.2, accelerator CZ / NS: 3.5-6, anti-scorch agent CTP: 0.5-1.

[0007] Furthermore, the antioxidant includes one or more of antioxidant MB, antioxidant MBZ, antioxidant 4010NA and antioxidant 4020.

[0008] Furthermore, the modified sepiolite is prepared by modifying sepiolite with a coupling agent, the amount of the coupling agent used is 2% to 5% of the mass of the sepiolite, the coupling agent includes a silane coupling agent and / or a titanate coupling agent, and the particle size of the sepiolite is 25-75 microns.

[0009] Furthermore, the carbon black includes carbon black N660 and carbon black DZ990, and the mass ratio of carbon black N660 to carbon black DZ990 in the carbon black is 2.5:1~3:1.

[0010] Furthermore, for the high temperature resistant, low VOCs motorcycle inner tube formula described in the present invention, the rubber compound mixing process of the present invention can be operated according to the prior art without other special steps.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The motorcycle inner tube rubber material of the present invention is added with magnesium aluminum silicate, which utilizes its large surface area and developed micropore system to effectively achieve partial adsorption inhibition of volatile organic compounds generated by raw materials and production processes; 2. The rubber material of the motorcycle inner tube of the present invention is added with modified sepiolite, which is a hydrated iron-rich silicate clay mineral with a layered chain structure, low shrinkage, good plasticity, large specific surface area, strong adsorption, and good heat insulation and thermal stability. The modified sepiolite selected in the present invention is obtained by modification with a silane coupling agent or a titanate coupling agent, which can be evenly dispersed in the rubber matrix to reinforce the rubber matrix; the modified sepiolite has a special lamellar or needle-like structure, which can effectively inhibit the penetration of oxygen molecules during the oxidation process and has a good barrier effect on heat and oxygen; and because of the strong adsorption of sepiolite, it has an inhibitory effect on the chain reaction, so that the sepiolite can effectively improve the thermal oxygen stability of the composite rubber; 3. The modified sepiolite and aluminum magnesium silicate in the present invention work synergistically, which can effectively adsorb and inhibit the volatilization and release of low-boiling organic matter in the raw materials, and can also reinforce the rubber matrix and improve its mechanical properties. It can also isolate heat and oxygen, and improve the heat and oxygen aging resistance of the rubber material; 4. The antioxidant selected in the present invention is one or more of antioxidant MB, antioxidant MBZ, antioxidant 4010NA and antioxidant 4020. Antioxidant MB and antioxidant MBZ are both benzimidazole rubber antioxidants, have excellent heat resistance, will not capture free radicals generated when the vulcanizing agent decomposes, and thus will not affect the physical and mechanical properties of the vulcanized rubber matrix. DETAILED DESCRIPTION

[0012] In order to further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below in combination with examples, but they should not be understood as limiting the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0013] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the art.

[0014] In the present invention, the rubber compound mixing process of the present invention can be operated according to the prior art without other special steps.

[0015] The raw materials used in the embodiments of the present invention are: The modified sepiolite is obtained by modification with a silane coupling agent, wherein the amount of the coupling agent is 2wt% of the amount of the sepiolite; The purity of the bubble stone is not less than 97wt%, and the particle size distribution is 25-75 microns.

[0016] Embodiment 1: The high temperature resistant, low VOCs motorcycle inner tube formula provided in this embodiment includes the following components in parts by weight: Natural rubber: 75, reclaimed rubber: 80, zinc oxide: 5, stearic acid: 2, antioxidant MB: 1, antioxidant 4010NA: 0.8, antioxidant 4020: 2, microcrystalline wax: 1, adhesive resin: 4, magnesium aluminum silicate: 1.2, modified sepiolite: 1.2, carbon black N660: 18, carbon black DZ990: 7, light calcium: 53, aromatic oil: 8, sulfur: 1.8, accelerator CZ: 4.8, anti-scorch agent CTP: 0.6.

[0017] Example 2 The high temperature resistant, low VOCs motorcycle inner tube formula provided in this embodiment includes the following components in parts by weight: Natural rubber: 60, reclaimed rubber: 64, zinc oxide: 4, stearic acid: 1.5, antioxidant MBZ: 0.6, antioxidant 4010NA: 0.6, antioxidant 4020: 1.6, microcrystalline wax: 0.9, adhesive resin: 3.2, magnesium aluminum silicate: 1, modified sepiolite: 0.9, carbon black N660: 15, carbon black DZ990: 6, light calcium: 42, aromatic oil: 7, sulfur: 1.4, accelerator CZ: 3.8, anti-scorch agent CTP: 0.5.

[0018] Example 3 The high temperature resistant, low VOCs motorcycle inner tube formula provided in this embodiment includes the following components in parts by weight: Natural rubber: 90, reclaimed rubber: 96, zinc oxide: 6, stearic acid: 2.5, antioxidant MB: 1.2, antioxidant 4010NA: 0.9, antioxidant 4020: 2.4, microcrystalline wax: 1.2, adhesive resin: 4.8, magnesium aluminum silicate: 1.4, modified sepiolite: 1.4, carbon black N660: 23, carbon black DZ990: 9, light calcium: 64, aromatic oil: 11, sulfur: 2.1, accelerator CZ: 5.8, anti-scorch agent CTP: 0.8.

[0019] The performance test of the rubber compound is shown in Table 1, Table 2, and Table 3, and the difference is that the test temperature of some properties is different. It can be seen from Table 3 that the rubber compound prepared by the high temperature resistant, low VOCs motorcycle inner tube formula of the present invention can still maintain high mechanical properties at high temperature, with a tensile strength of more than 12.1MPa and an elongation at break of more than 460%; after hot air aging (100℃×48h), the retention rates of tensile strength and elongation at break are maintained at more than 95% and 91% respectively, indicating that the rubber compound prepared by the high temperature resistant, low VOCs motorcycle inner tube formula of the present invention has good thermal stability.

[0020] Physical and chemical data analysis of the inner tube rubber material of the above embodiment Main experimental equipment: MZ-4000D (Jiangsu Mingzhu tensile machine), GT-7080S2 (Dongguan High-speed Railway Instrument Company), GT-M2000A (Dongguan High-speed Railway Instrument Company), DMAQ800 (TA Company, USA), Nutech3000 portable methane / non-methane total hydrocarbon analyzer (Nanjing Youtai Technology), 401A thermal aging test chamber (Jiangsu Zhenwei Testing Machinery Co., Ltd.).

[0021] Comparison of vulcanization characteristics: Table 1 project Example 1 Example 2 Example 3 Test temperature (℃) 175 175 175 ML / (dN.M) 3.86 4.51 4.45 MH / (dN.M) 11.54 12.25 12.22 tS1 / min 0:58 1:00 0:58 tC90 / min 1:20 1:32 1:30 Mooney viscosity (ML1+4, 100) 40 38 41

[0022] Table 2 300% elongation (Mpa) 6.2 6.3 6.2 Permanent deformation (%) 20 20 15 <![CDATA[Total Volatile Organic Compounds (TVOC) in the Banbury Mixing Shop (mgc / m 3 )]]> 23.48 24.22 22.10 <![CDATA[NMHC in Banburying Workshop (mgc / m 3 )]]> 22.59 23.00 21.00 <![CDATA[Toyota Vehicle Operations Center (mgc / m 3 )]]> 9.65 9.98 9.12 <![CDATA[Sulfur vulcanization workshop NMHC (mgc / m 3 )]]> 8.44 8.88 8.11

[0023] Table 3

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high temperature resistant, low VOCs motorcycle inner tube formula, characterized in that: The composition comprises the following components in parts by weight: Natural rubber: 60-90, reclaimed rubber: 64-100, zinc oxide: 4-6, stearic acid: 1.5-2.5, antioxidant: 3-5, microcrystalline wax: 0.8-1.5, adhesive resin: 3-5, aluminum magnesium silicate: 0.8-1.5, modified sepiolite: 0.8-1.5, carbon black: 20-32, light calcium: 40-65, aromatic oil: 7-12, sulfur: 1.3-2.2, accelerator CZ / NS: 3.5-6, anti-scorch agent CTP: 0.5-1.

2. The high temperature resistant, low VOCs motorcycle inner tube formula according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant MB, antioxidant MBZ, antioxidant 4010NA and antioxidant 4020.

3. The high temperature resistant, low VOCs motorcycle inner tube formula according to claim 1, characterized in that: The modified sepiolite is prepared by modifying sepiolite with a coupling agent, the amount of the coupling agent used is 2% to 5% of the mass of the sepiolite, the coupling agent includes a silane coupling agent and / or a titanate coupling agent, and the particle size of the sepiolite is 25-75 microns.

4. The high temperature resistant, low VOCs motorcycle inner tube formula according to claim 1, characterized in that: The high temperature resistant, low VOCs motorcycle inner tube formula is added with magnesium aluminum silicate.

5. The high temperature resistant, low VOCs motorcycle inner tube formula according to claim 1, characterized in that: The carbon black includes carbon black N660 and carbon black DZ990, and the mass ratio of carbon black N660 to carbon black DZ990 in the carbon black is 2.5:1-3:

1.

6. A high temperature resistant, low VOCs motorcycle inner tube formula according to any one of claims 1 to 5, characterized in that: The rubber compound mixing process for preparing the high temperature resistant, low VOCs motorcycle inner tube formula can be operated according to the prior art without any other special steps.

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