Tread rubber composite additive prepared from asphalt-like substance

Abstract

The invention relates to the field of rubber additive manufacturing, and prepares an asphalt-like substance composite additive applied to tire tread rubber. The asphalt substance contains but is not limited to benzenediol tar, furan phenol tar and benzenediol tar-formaldehyde oligomer. The composite additive prepared by the method is a reactive additive, partially participates in the cross-linking reaction of natural rubber or synthetic rubber, has the characteristics of a rubber plasticizer, and has the advantage of environmental friendliness due to no polycyclic aromatic hydrocarbon. The tread rubber prepared by using the composite additive has the advantages of low energy consumption in the rubber material mixing process, good extrudate size stability, good surface quality of the extruded and calendered rubber material, and good physical and mechanical properties, high tear resistance, high cutting resistance, low cost and the like on the premise of ensuring the processability compared with the common tread rubber composition. Tire durability can be improved and tire life can be prolonged.

Description

Technical Field

[0001] The present invention relates to the field of rubber additive manufacturing, and in particular to a composite additive of asphalt-like substances applied to the tread rubber of heavy-duty tires. Background Art

[0002] With the development of the automotive industry and the road industry, higher requirements are continuously put forward for the tire industry: the tire is required to have good wear resistance to improve the service life of the tire; have low rolling resistance to reduce fuel consumption and save energy; have a series of handling stabilities such as good starting, braking, turning, and sideslip to ensure safety; have large load capacity, large traction, good off-road performance, high temperature and high speed adaptability; have good buffering performance and low noise, etc. During the use of all-steel radial heavy-duty tires, due to harsh road conditions and large loads, higher requirements are placed on the tear resistance, anti-chipping and chunking, and wear resistance of the tires. The function of the rubber tear resistance agent is to improve the tear resistance of the tire tread rubber, reduce chipping and chunking, and extend the service life of the tire.

[0003] Hydroquinone tar is a by-product of the phenol industry. It has long been a solid waste and is difficult to form a product. However, as a rubber co-crosslinking agent or plasticizer, it can improve various properties of the tread rubber of heavy-duty tires, and there are no polycyclic aromatic hydrocarbons strictly restricted in tires. By making full use of this unique advantage, its application in tire products can be expanded. Summary of the Invention

[0004] The object of the present invention is to manufacture a new type of biomass tear resistance agent, which has good tear resistance and good cut resistance and can extend the service life of tires.

[0005] The weight ratio of the composite additive of asphalt-like substances in the present invention is as follows: 40 - 60 parts of hydroquinone tar, 40 - 60 parts of furfural phenol tar, and 10 - 30 parts of hydroquinone tar-formaldehyde oligomer.

[0006] The prominent substantive features and remarkable effects of the present invention can be reflected from the following embodiments, but they do not impose any limitations on the present invention. Detailed Embodiments

[0007] Table 1 General formula of tread rubber of heavy-duty tires and formula of the embodiment of the present invention

[0008]

[0009] Note: Natural rubber: 3# smoked sheet rubber, produced in Thailand, and other conventional reagents are commercially available.

[0010] The preparation processes of the above-mentioned embodiment formulas are as follows:

[0011] The first stage of mixing: Add natural rubber and mix at 60°C for 1 minute, then add small ingredients such as asphalt-like additives, zinc oxide, stearic acid, anti-aging agents, and anti-scorching agents and mix for 1.5 minutes. Then add carbon black and environmentally friendly aromatic oil and mix for 3 minutes, and then discharge the rubber. The discharge temperature is 150 - 170°C;

[0012] The second stage of mixing: Add the rubber compound from the first stage of mixing, sulfur, and accelerators, and pass it through the two-roll mill 6 times and then sheet it. The mixed rubber is parked for more than 16 hours, and the specimens are vulcanized on a flat vulcanizer according to the required specimen size, temperature, pressure, and time. The vulcanization conditions of the rubber compound on the flat vulcanizer are 150°C × 25 minutes.

[0013] The main instruments, test methods, and standards used in all the tests in this project are as follows:

[0014] Rubber mixing: The internal mixer used is a Banbury internal mixer from Farrell Company of the UK with a volume of 1.57 liters. The two-roll mill is an XK-160A type two-roll mill from Shanghai Rubber Machinery Factory. Rubber mixing is carried out in accordance with GB / T6038-2006 "Rubber Test Compounding, Mixing and Vulcanizing Equipment and Operating Procedures".

[0015] Mooney viscosity of the mixed rubber: Use an MV200E type rubber Mooney viscometer from Beijing Youshen Electronic Instrument Co., Ltd. and test in accordance with GB / T 1232.1-2016 "Determination of viscosity of uncured rubber by the rotating-disk viscometer - Part 1: Determination of Mooney viscosity".

[0016] Mooney scorch: Use an M200E type rubber Mooney viscometer from Beijing Youshen Electronic Instrument Co., Ltd. and determine with a rotating-disk viscometer in accordance with GB / T1233-2008 "Determination of the scorching characteristics of uncured rubber".

[0017] Vulcanization characteristics: Use a C2000E type rubber non-rotor vulcanization instrument from Beijing Youshen Electronic Instrument Co., Ltd. and test in accordance with GB / T 16584-1996 "Determination of vulcanization characteristics of rubber by non-rotor vulcanization instrument".

[0018] Hardness: Determine in accordance with GB / T 531.1-2008 "Rubber, vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)".

[0019] Tensile strength, elongation at break, and modulus at a given elongation: Use an INSTRON material tensile testing machine from the United States and conduct relevant tests in accordance with GB / T528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties".

[0020] Tear strength: Test was conducted using an INSTRON material tensile testing machine from the United States in accordance with GB / T 529-2008 "Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser, right-angle and crescent specimens)".

[0021] Thermal-oxidative aging performance of vulcanizate: Test was carried out using a hot air aging oven from Beijing Yashilin Experimental Equipment Co., Ltd. in accordance with GB / T 3512-2014 "Accelerated hot air aging and heat resistance test for vulcanized rubber or thermoplastic rubber".

[0022] Rebound resilience: Relevant tests were performed using a Y3000E type compression heat build-up testing machine from Beijing Youshen Electronic Instrument Co., Ltd. in accordance with GB / T1681-2009 "Determination of rebound resilience of vulcanized rubber".

[0023] Compression heat build-up: Test was conducted using a Y3000E type compression heat build-up testing machine from Beijing Youshen Electronic Instrument Co., Ltd. in accordance with GB / T 1687.3-2016 "Determination of temperature rise and fatigue resistance properties of vulcanized rubber in flexing - Part 2: Compression flexing test".

[0024] Flex fatigue: Test was carried out using an XP-16 type rubber fatigue testing machine in accordance with GB / T13934-2006 "Determination of flex fatigue and crack growth of vulcanized rubber or thermoplastic rubber (De Mattia type)".

[0025] Akron abrasion: Test was performed using an Akron experimental abrasion machine from Jiangdu Experimental Instrument Factory in accordance with GB / T1689-2014 "Determination of abrasion resistance of vulcanized rubber (using Akron abrasion machine)".

[0026] Rolling resistance: Test was conducted using a rubber rolling resistance tester RSS-II from Wanhui Yifang. With a load of 15 MPa and a rotational speed of 400 rev / min, the rolling loss (J / rev), dynamic deformation (mm) and dynamic heat build-up of the vulcanized rubber compound were measured.

[0027] Analysis of rubber processing performance: The processing performance of the mixed rubber was analyzed and characterized using an RPA2000 type rubber processing analyzer from Alpha Company.

[0028] Others: For the tests of various properties of the rubber compound, all were carried out in accordance with the relevant regulations of the relevant national or industrial standards.

[0029] Table 2 Properties of the mixed rubber

[0030]

[0031]

[0032] Table 3 Basic physical properties of the vulcanizate

[0033]

[0034] Table 4 Dynamic properties of vulcanizate

[0035]

[0036]

[0037] It is not difficult to see from the data that the addition of asphalt-like additives can reduce the scorch time and vulcanization time of the mixed rubber, improve the mechanical properties of vulcanized rubber as well as its resistance to cutting, flex cracking and crack growth. These properties are beneficial to resisting mechanical damage and are suitable for popularization and application in tires.

Claims

1. A tread compound composite aid prepared from a pitch-like substance, characterized in that: The biological composite aid is composed of the following: hydroquinone tar, furfural phenol tar, hydroquinone tar-formaldehyde oligomer, etc.

2. The tread compound composite aid prepared from a pitch-like substance according to claim 1, characterized in that: 40-60 parts of hydroquinone tar, 40-60 parts of furfural phenol tar, and 10-30 parts of hydroquinone tar-formaldehyde oligomer.

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