阅读说明：本技术 一种煤矿运输用全钢巨型工程子午线轮胎低生热胎面胶及其制备方法 (All-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation and preparation method thereof ) 是由 余团清 朱志鹏 王剑锋 黄晶晶 张文标 于 2021-11-10 设计创作，主要内容包括：本发明涉及一种煤矿运输用全钢巨型工程子午线轮胎低生热胎面胶及其制备方法,它的原料配方包括按重量份计的以下组份：天然橡胶60-70份、氧化锌1-3份、硬脂酸0.5-1份、防老剂RD 0.5-1.5份、防老剂4020 1-2份、硅烷偶联剂1-2份、防护蜡1-2份、炭黑15-20份、GC-21碳纳米管1-3份、超轻多孔硅5-8份、硫磺0.5-1.5份、促进剂0.3-1份、功能改性剂DC-01 0.1-0.5份、防焦剂0.1-0.3份；该橡胶材料在机械运动压缩过程中产生相对比较少的热量,其良好的导热性能、抗硫化返原性能,减少热量对橡胶材料性能的影响,延长橡胶材料的使用时间,从而提高轮胎的使用寿命。(The invention relates to an all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation and a preparation method thereof, wherein the raw material formula comprises the following components in parts by weight: 60-70 parts of natural rubber, 1-3 parts of zinc oxide, 0.5-1 part of stearic acid, 0.5-1.5 parts of anti-aging agent RD, 1-2 parts of anti-aging agent 40201, 1-2 parts of silane coupling agent, 1-2 parts of protective wax, 15-20 parts of carbon black, 1-3 parts of GC-21 carbon nanotube, 5-8 parts of ultra-light porous silicon, 0.5-1.5 parts of sulfur, 0.3-1 part of accelerator, 0.5-0.5 part of functional modifier DC-010.1 and 0.1-0.3 part of scorch retarder; the rubber material generates relatively less heat in the mechanical motion compression process, has good heat conduction performance and good anti-reversion performance, reduces the influence of the heat on the performance of the rubber material, prolongs the service life of the rubber material, and thereby improves the service life of the tire.)

1. The utility model provides a coal mine transportation is with huge engineering radial tire low heat generation tread rubber of all steel which characterized in that: the raw material formula comprises the following components in parts by weight:

60-70 parts of natural rubber, 1-3 parts of zinc oxide, 0.5-1 part of stearic acid, 0.5-1.5 parts of anti-aging agent RD, 1-2 parts of anti-aging agent 40201, 1-2 parts of silane coupling agent, 1-2 parts of protective wax, 15-20 parts of carbon black, 1-3 parts of GC-21 carbon nanotube, 5-8 parts of ultra-light porous silicon, 0.5-1.5 parts of sulfur, 0.3-1 part of accelerator, 0.5-0.5 part of functional modifier DC-010.1 and 0.1-0.3 part of scorch retarder.

2. The all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 1, which is characterized in that: the natural rubber is RSS3# smoked sheet rubber.

3. The all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 1, which is characterized in that: the silane coupling agent is a silane coupling agent Si-69; the carbon black is carbon black N220; the scorch retarder is a scorch retarder CTP.

4. The all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 1, which is characterized in that: the promoter is one or a mixture of two of a promoter NS and a promoter CZ.

5. The all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 1, which is characterized in that: the raw material formula comprises the following components in parts by weight:

65.6 parts of natural rubber, 2.0 parts of zinc oxide, 0.7 part of stearic acid, 1.0 part of antioxidant RD, 40201.3 parts of antioxidant, Si-691.3 parts of silane coupling agent, 1.3 parts of protective wax, 16.4 parts of carbon black, 2.0 parts of GC-21 carbon nano tube, 6.6 parts of ultra-light porous silicon, 1.0 part of sulfur, 0.5 part of accelerator, DC-010.3 parts of functional modifier and 0.1 part of scorch retarder.

6. The preparation method of the all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 1, characterized by comprising the following steps: adopting variable-speed mixing process of internal mixer, controlling rotor speed of internal mixer to be 30-60rpm and upper ram pressure to be 30-60N/cm²The temperature of the cooling water of the internal mixer is 30-35 ℃, and the method specifically comprises the following steps:

(1) primary smelting: in an internal mixer, firstly plasticating the natural rubber to obtain natural rubber plasticated rubber;

(2) a first-stage masterbatch: adding plasticated rubber, carbon black, ultralight porous silicon, zinc oxide, stearic acid, a silane coupling agent, GC-21 carbon nanotubes and protective wax into an internal mixer according to the raw material formula of claim 1, and mixing according to a filling factor of 70-75% to prepare a section of master batch, wherein the using amount of the carbon black is two thirds of the total amount of the carbon black in the raw material formula;

(3) two-stage masterbatch: adding the first-stage masterbatch, the remaining one third of carbon black, the antioxidant RD and the antioxidant 4020 into an internal mixer according to the filling coefficient of 70-75% for mixing to prepare second-stage masterbatch;

(4) and (3) final refining: adding the two-stage masterbatch, sulfur, an accelerator, an anti-scorching agent and a functional modifier DC-01 into an internal mixer according to a filling coefficient of 70-75%, mixing, discharging rubber to an open mill, turning and cooling rubber materials to obtain the low-heat-generation tread rubber of the all-steel giant engineering radial tire for coal mine transportation, and then winding and storing the rubber materials.

7. The preparation method of the all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 6, characterized by comprising the following steps: the specific operation method of the step (1) comprises the following steps: the rotor speed of the internal mixer is controlled to be 40rpm, and the top plug pressure is controlled to be 40N/cm²Then, adding natural rubber, pressing a top bolt and keeping for 40-50 seconds; then, lifting the top bolt, and keeping for 5-10 seconds; and then the top bolt is mounted for 30-40 seconds, the rubber is discharged under the conditions of 155-165 ℃, the thickness of the rubber sheet is controlled to be 5-10mm by the lower sheet of the extruder, and the coiled rubber material is parked for 6-8 hours to prepare the natural rubber plasticated rubber.

8. The preparation method of the all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 6, characterized by comprising the following steps: the specific operation method of the step (2) is as follows:

1) according to the raw material formula of claim 1, adding the plasticated rubber obtained in the step (1), two thirds of carbon black, ultralight porous silicon, zinc oxide, stearic acid, a silane coupling agent, a GC-21 carbon nano tube and protective wax into an internal mixer according to a filling coefficient of 70-75%, mixing, pressing a top bolt, keeping for 25-45 seconds, controlling the speed of a rotor of the internal mixer to be 50rpm and the pressure of the top bolt to be 50N/cm²；

2) Lifting the top bolt, and keeping for 5-10 seconds;

3) pressing a top bolt to heat the rubber material to 140-145 ℃;

4) lifting the top bolt, and keeping for 5-10 seconds;

5) pressing the top bolt to reduce the rotor speed of the internal mixer to 30rpm at 145-150 ℃ and the top bolt pressure to 30N/cm²Under the condition of (1), mixing for 90-150 seconds at constant temperature;

6) lifting the top plug, keeping for 5-10 seconds, raising the rotor speed of the internal mixer to 60rpm, and controlling the pressure of the top plug to be 60N/cm²；

7) Pressing a top bolt to heat the rubber material to 165-170 ℃;

8) discharging the rubber to a screw extruder, controlling the thickness of the rubber sheet to be 5-7mm by the lower piece of the screw extruder, then conveying the rubber sheet to an open mill, turning and milling the rubber material, cooling the rubber material, and standing the curled rubber material for 6-8h to obtain a section of master rubber.

9. The preparation method of the all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 6, characterized by comprising the following steps: the specific operation method of the step (3) is as follows:

adding a section of masterbatch, the remaining one third of carbon black, an anti-aging agent RD and an anti-aging agent 4020 into an internal mixer for mixing according to a filling coefficient of 70-75%, wherein the rotor speed of the internal mixer is controlled to be 50rpm, and the top plug pressure is controlled to be 50N/cm²Controlling the rubber discharging temperature at 155-; then, discharging the rubber to a screw extruder, and controlling the thickness of the rubber sheet to be 5-7mm by the lower piece of the screw extruder; and then conveying the rubber material to an open mill, turning and cooling the rubber material, and standing the curled rubber material for 6-8h to obtain the second-stage master batch.

10. The preparation method of the all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation according to claim 6, characterized by comprising the following steps: the specific operation method of the step (4) is as follows:

1) the internal mixer is kept at a low speed of 30rpm of a rotor and at an upper plug pressure of 30N/cm²；

2) Adding the two-stage masterbatch obtained in the step (3), sulfur, an accelerator, a scorch retarder and a functional modifier DC-01 into an internal mixer for mixing according to the filling coefficient of 70-75%;

3) pressing the top bolt for 30 seconds, and lifting the top bolt for 10 seconds;

4) pressing a top bolt to heat the rubber material to 105 ℃, lifting the bolt and removing the glue;

5) and (3) discharging the rubber to an open mill, turning and cooling the rubber material to obtain the low-heat-generation tread rubber of the all-steel giant engineering radial tire for coal mine transportation, and then curling and storing the rubber material.

Technical Field

The invention relates to a low-heat-generation tread rubber for an all-steel giant engineering radial tire for coal mine transportation and a preparation method thereof, and the low-heat-generation tread rubber is mainly used as a tread rubber sizing material of an 59/80R63 all-steel giant engineering radial tire.

Background

The coal mine generally uses over 330 tons of oversize mine trucks for transportation in order to maximize the transportation efficiency, the special transportation capacity is the first choice of transportation tools on the coal mine, the matched current global maximum all-steel giant tires 59/80R63 have the single tire loading capacity of 100 tons, and the all-steel giant tires have harsh conditions, poor road surface, long driving range and high driving speed in the coal mine, often exceed the TKPH value of the tires, so that the tires generate large heat, rubber is a hot poor conductor, the generated heat is difficult to discharge in time, the heat can be accumulated, the accumulation of the thicker heat on the section of the 59/80R63 all-steel giant tires can be more serious, the thermal aging speed of the tires can be accelerated under long-time work, the mechanical property of rubber materials can be rapidly reduced, the molecular chains of the rubber can be degraded, the phenomena of early thermal peeling, void removal and the like of the tires can occur, and the price of the all-steel giant tires is high, shortened service life increases operating costs. The key requirement is that the tread rubber material of the all-steel giant tire has excellent low heat buildup property, high heat conduction property and vulcanization reduction resistance to improve the temperature rise of the tire and prolong the service life.

Disclosure of Invention

The invention aims to provide a low-heat-generation tread rubber of an all-steel giant engineering radial tire for coal mine transportation and a preparation method thereof; the rubber material generates relatively less heat in the mechanical motion compression process, has good heat conduction performance and vulcanization reversion resistance, reduces the influence of the heat on the performance of the rubber material, prolongs the service life of the rubber material, and accordingly prolongs the service life of the tire.

The invention aims to improve the low heat buildup property, the reversion resistance and the heat conduction property of the tread rubber of the all-steel giant engineering radial tire for coal mine transportation, prolong the service life of the tire, reduce the cost and improve the economic benefit on the premise of ensuring other properties of the tread rubber of the all-steel giant engineering radial tire required by the use of the all-steel giant engineering radial tire for coal mine transportation.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a coal mine transportation is with huge engineering radial tire low heat generation tread rubber of all steel which characterized in that: the raw material formula comprises the following components in parts by weight:

60-70 parts of natural rubber, 1-3 parts of zinc oxide, 0.5-1 part of stearic acid, 0.5-1.5 parts of anti-aging agent RD, 1-2 parts of anti-aging agent 40201, 1-2 parts of silane coupling agent, 1-2 parts of protective wax, 15-20 parts of carbon black, 1-3 parts of GC-21 carbon nanotube, 5-8 parts of ultra-light porous silicon, 0.5-1.5 parts of sulfur, 0.3-1 part of accelerator, 0.5-0.5 part of functional modifier DC-010.1 and 0.1-0.3 part of scorch retarder.

The natural rubber is RSS3# smoked sheet rubber, and the hardness is 65shore A-70shore A; the tensile strength is 25MPA-30 MPA; the elongation is 450-500%.

The carbon black is carbon black N220, and the specific surface area is 121m²The oil absorption value is 114ml/100 g.

The specific surface area of the ultra-light porous silicon is 114m²The particle size of 13.5 microns is natural porous structure ore in the nature, and a spherical structure with submicron pore diameter is finally formed after grinding and screening treatment, and the spherical structure has the characteristics of spherical particles, porosity, large particle size, low density and the like.

The GC-21 carbon nanotube has a specific surface area of 282m²And/g is a wet granulation product of the vertically oriented array multi-walled carbon nanotube. The wet granulation process has a pre-dispersion effect on the carbon nano tubes, and the dispersion effect of the carbon nano tubes in rubber is improved.

The chemical name of the functional modifier DC-01 is N' - (1, 3-dimethylbutylidene) -3-hydroxy-2-naphthohydrazide, and the functional modifier DC-01 is a functional modifier which has the effects of reducing heat generation and resisting reversion of vulcanization on natural rubber.

The anti-aging agent comprises an anti-aging agent RD and an anti-aging agent 4020. Wherein, the chemical name of the antioxidant RD is 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer, and the chemical name of the antioxidant 4020 is N- (1, 3-dimethylbutyl) -N' -phenyl-p-phenylenediamine.

The zinc oxide is white powder and is mainly used as a rubber activator.

The stearic acid is octadecanoic acid with a molecular formula C₁₈H₃₆O₂The method is mainly used for producing stearate.

The silane coupling agent is a silane coupling agent Si-69 which is bis- [ y- (triethoxy doll) propyl ] tetrasulfide.

The promoter is one or a mixture of two of a promoter NS and a promoter CZ.

The scorch retarder is a scorch retarder CTP with a molecular formula of C₁₄H₁₅O₂NS, a white or pale yellow crystal, readily soluble in benzene, diethyl ether, acetone and ethyl acetate, soluble in warm n-heptane and carbon tetrachloride, slightly soluble in gasoline, insoluble in kerosene and water.

The low-heat-generation tread rubber of the all-steel giant engineering radial tire for coal mine transportation preferably comprises the following components in parts by weight:

65.6 parts of natural rubber, 2.0 parts of zinc oxide, 0.7 part of stearic acid, 1.0 part of antioxidant RD, 40201.3 parts of antioxidant, Si-691.3 parts of silane coupling agent, 1.3 parts of protective wax, N22016.4 parts of carbon black, 2.0 parts of GC-21 carbon nano tube, 6.6 parts of ultra-light porous silicon, 1.0 part of sulfur, 0.5 part of accelerator, DC-010.3 parts of functional modifier and 0.1 part of scorch retarder.

The preparation method of the all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation adopts an internal mixer variable speed mixing process, and controls the rotor speed of the internal mixer to be 30-60rpm and the upper ram pressure to be 30-60N/cm²The temperature of the cooling water of the internal mixer is 30-35 ℃, and the method specifically comprises the following steps:

(1) primary smelting: in an internal mixer, firstly plasticating the natural rubber to obtain natural rubber plasticated rubber;

(2) a first-stage masterbatch: adding plasticated rubber, carbon black, ultralight porous silicon, zinc oxide, stearic acid, a silane coupling agent, a GC-21 carbon nanotube and protective wax into an internal mixer according to the raw material formula, and mixing according to a filling coefficient of 70-75% to prepare a section of master batch, wherein the using amount of the carbon black is two thirds of the total amount of the carbon black in the raw material formula;

(3) two-stage masterbatch: adding the first-stage masterbatch, the remaining one third of carbon black, the antioxidant RD and the antioxidant 4020 into an internal mixer according to the filling coefficient of 70-75% for mixing to prepare second-stage masterbatch;

(4) and (3) final refining: adding the two-stage masterbatch, sulfur, an accelerator, an anti-scorching agent and a functional modifier DC-01 into an internal mixer according to a filling coefficient of 70-75%, mixing, discharging rubber to an open mill, turning and cooling rubber materials to obtain the low-heat-generation tread rubber of the all-steel giant engineering radial tire for coal mine transportation, and then winding and storing the rubber materials.

The specific operation method of the step (1) comprises the following steps: the rotor speed of the internal mixer is controlled to be 40rpm, and the top plug pressure is controlled to be 40N/cm²Then, adding natural rubber, pressing a top bolt and keeping for 40-50 seconds; then, lifting the top bolt, and keeping for 5-10 seconds; and then the top bolt is mounted for 30-40 seconds, the rubber is discharged under the conditions of 155-165 ℃, the thickness of the rubber sheet is controlled to be 5-10mm by the lower sheet of the extruder, and the coiled rubber material is parked for 6-8 hours to prepare the natural rubber plasticated rubber.

The specific operation method of the step (2) is as follows:

1) adding the plasticated rubber obtained in the step (1), two thirds of carbon black, ultralight porous silicon, zinc oxide, stearic acid, a silane coupling agent, a GC-21 carbon nano tube and protective wax into an internal mixer according to the raw material formula, mixing according to a filling coefficient of 70-75%, pressing a top bolt and keeping for 25-45 seconds; the rotor speed of the internal mixer is controlled to be 50rpm, and the top plug pressure is controlled to be 50N/cm²；

2) Lifting the top bolt, and keeping for 5-10 seconds;

3) pressing a top bolt to heat the rubber material to 140-145 ℃;

4) lifting the top bolt, and keeping for 5-10 seconds;

5) pressing the top bolt to reduce the rotor speed of the internal mixer to 30rpm at 145-150 ℃ and the top bolt pressure to 30N/cm²Under the condition of (1), mixing for 90-150 seconds at constant temperature;

6) lifting the top bolt, keeping for 5-10 seconds,the rotor speed of the internal mixer is increased to 60rpm, and the upper plug pressure is controlled to be 60N/cm²；

7) Pressing a top bolt to heat the rubber material to 165-170 ℃;

8) discharging the rubber to a screw extruder, controlling the thickness of the rubber sheet to be 5-7mm by the lower piece of the screw extruder, then conveying the rubber sheet to an open mill, turning and milling the rubber material, cooling the rubber material, and standing the curled rubber material for 6-8h to obtain a section of master rubber.

The specific operation method of the step (3) is as follows:

adding a section of masterbatch, the remaining one third of carbon black, an anti-aging agent RD and an anti-aging agent 4020 into an internal mixer for mixing according to a filling coefficient of 70-75%, wherein the rotor speed of the internal mixer is controlled to be 50rpm, and the top plug pressure is controlled to be 50N/cm²Controlling the rubber discharging temperature at 155-; then, discharging the rubber to a screw extruder, and controlling the thickness of the rubber sheet to be 5-7mm by the lower piece of the screw extruder; and then conveying the rubber material to an open mill, turning and cooling the rubber material, and standing the curled rubber material for 6-8h to obtain the second-stage master batch.

The specific operation method of the step (4) is as follows:

1) the internal mixer is kept at a low speed of 30rpm of a rotor and at an upper plug pressure of 30N/cm²；

2) Adding the two-stage masterbatch obtained in the step (3), sulfur, an accelerator, a scorch retarder and a functional modifier DC-01 into an internal mixer for mixing according to the filling coefficient of 70-75%;

3) pressing the top bolt for 30 seconds, and lifting the top bolt for 10 seconds;

4) pressing a top bolt to heat the rubber material to 105 ℃, lifting the bolt and removing the glue;

5) and (3) discharging the rubber to an open mill, turning and cooling the rubber material to obtain the low-heat-generation tread rubber of the all-steel giant engineering radial tire for coal mine transportation, and then curling and storing the rubber material.

Compared with the prior art, the invention has the advantages that:

(1) according to the invention, the ultralight porous silicon is added into the formula rubber material to replace the traditional white carbon black, compared with the traditional white carbon black, the ultralight porous silicon spherical structure is easier to disperse and is not easy to agglomerate in the rubber formula, the problem that the dispersion is not easy to disperse in the white carbon black rubber formula and the agglomeration is easy to form a secondary structure is solved, and the heat generation of vulcanized rubber in the rubber formula is reduced.

(2) The functional modifier DC-01 is adopted to reduce the heat generation of the tread rubber of the tire and improve the anti-reversion performance, and the action mechanism of the functional modifier DC-01 is that on one hand, carbon black and rubber can be combined more tightly, the interaction force between the carbon black and the rubber is enhanced, the interaction force between carbon black particles is reduced, the heat generation is reduced from the surface, on the other hand, the utilization efficiency of sulfur is improved, the proportion of single sulfur and double sulfur in a vulcanization system is improved, and the anti-reversion performance is improved from the aspect of sulfur bond composition.

(3) The invention solves the problem that the carbon nano tube is difficult to disperse in rubber by adopting the GC-21 carbon nano tube, improves the heat-conducting property of the tread rubber of the tire, and reduces the performance reduction of the rubber caused by the heat accumulation of the rubber.

(4) The invention adopts a variable-speed mixing process, improves the dispersion grade of the carbon black, and reduces the coupling time required by the ultralight porous silicon and the silane coupling agent at a specific temperature and the time required by the dispersion of the GC-21 carbon nano tube. The formula of the existing all-steel giant engineering tire low-heat-generation tread rubber for coal mines is optimized, and the low heat-generation performance of the all-steel giant engineering radial tire tread rubber for coal mines is improved.

(5) The rubber material prepared by the invention (namely the low-heat-generation tread rubber obtained by the invention) generates relatively less heat in the mechanical motion compression process. The heat conducting performance and the anti-reversion performance of the rubber material are good, the influence of heat on the performance of the rubber material is reduced, and the service life of the rubber material is prolonged, so that the service life of the tire is prolonged.

(6) On the premise of ensuring other performances of the all-steel giant tire tread rubber for coal mine transportation, the all-steel giant engineering radial tire tread rubber for coal mine transportation has the advantages of improving the low heat buildup property, the reversion resistance and the heat conduction performance, prolonging the service life of the tire, reducing the cost and improving the economic benefit.

Detailed Description

The present invention will be described in detail with reference to the following examples:

a low-heat-generation tread rubber for all-steel giant engineering radial tires for coal mine transportation comprises the following components in parts by weight:

65.6 parts of natural rubber, 2.0 parts of zinc oxide, 0.7 part of stearic acid, 1.0 part of antioxidant RD, 40201.3 parts of antioxidant, Si-691.3 parts of silane coupling agent, 1.3 parts of protective wax, N22016.4 parts of carbon black, 2.0 parts of GC-21 carbon nanotube, 6.6 parts of ultra-light porous silicon, 1.0 part of sulfur, 0.5 part of accelerator, DC-010.3 parts of functional modifier and 0.1 part of anti-scorching agent CTP.

Wherein the natural rubber is RSS3# smoked sheet rubber. The accelerator is accelerator NS.

The preparation method of the all-steel giant engineering radial tire low-heat-generation tread rubber for coal mine transportation adopts a variable speed mixing process of an internal mixer, the rotor speed of the internal mixer is controlled to be 30-60rpm, and the upper ram pressure is controlled to be 30-60N/cm²The temperature of the cooling water of the internal mixer is 30-35 ℃, and the method specifically comprises the following steps:

(1) a primary smelting process: in an internal mixer, firstly plasticating the natural rubber to obtain natural rubber plasticated rubber;

the specific method comprises the following steps: the rotor speed of the GK400N internal mixer is controlled to be 40rpm, and the upper ram pressure is set to be 40N/cm²Then adding natural rubber RSS3#, pressing a top bolt and keeping for 40-50 seconds; then, lifting the top bolt, and keeping for 5-10 seconds; then the top bolt is arranged for 30-40 seconds, the rubber is discharged at the temperature of 155-165 ℃, the thickness of the rubber sheet is controlled to be 5-10mm by the lower sheet of the extruder, and the coiled rubber material is parked for 6-8 hours to prepare the natural rubber RSS3# plasticated rubber.

(2) A first-stage masterbatch rubber mixing process comprises the following steps: adding the plasticated rubber, the carbon black, the ultralight porous silicon, the zinc oxide, the stearic acid, the silane coupling agent, the GC-21 carbon nano tube and the protective wax into an internal mixer according to the raw material formula, and mixing according to the filling coefficient of 70-75% to prepare a section of master batch, wherein the using amount of the carbon black is two thirds of the total amount of the carbon black in the raw material formula. The specific method comprises the following steps:

1) adding the natural rubber RSS3# plasticated rubber obtained in the step (1), two thirds of carbon black, ultralight porous silicon, zinc oxide, stearic acid, a silane coupling agent Si-69, a GC-21 carbon nanotube and protective wax into a GK400N internal mixer according to a filling coefficient of 70-75% for mixing, pressing a top bolt and keeping for 25-45 seconds; rotor of internal mixerSpeed 50rpm, plug-up pressure 50N/cm²

2) Lifting the top bolt, and keeping for 5-10 seconds;

3) pressing a top bolt to heat the rubber material to 140-145 ℃;

4) lifting the top bolt, and keeping for 5-10 seconds;

5) pressing the top bolt to reduce the rotor speed of the internal mixer to 30rpm at 145-150 ℃ and the top bolt pressure to 30N/cm²Under the condition of (1), mixing for 90-150 seconds at constant temperature;

6) lifting the top plug, keeping for 5-10 seconds, raising the rotor speed of the internal mixer to 60rpm, and controlling the pressure of the top plug to be 60N/cm²；

7) Pressing a top bolt to heat the rubber material to 165-170 ℃;

8) discharging the rubber to a screw extruder, controlling the thickness of the rubber sheet to be 5-7mm by the lower piece of the screw extruder, then conveying the rubber sheet to an open mill, turning and milling the rubber material, cooling the rubber material, and standing the curled rubber material for 6-8h to obtain a section of master rubber.

(3) The two-stage masterbatch rubber mixing process comprises the following steps: adding the first-stage masterbatch, the remaining one third of carbon black, the antioxidant RD and the antioxidant 4020 into an internal mixer according to the filling coefficient of 70-75% for mixing to prepare second-stage masterbatch; the specific method comprises the following steps:

adding a section of master batch, the remaining one third of carbon black, an anti-aging agent RD and an anti-aging agent 4020 into a GK400N internal mixer according to the filling coefficient of 70-75%, mixing, wherein the rotor speed of the internal mixer is 50rpm, and the upper ram pressure is 50N/cm²The rubber discharge temperature is 155-; and then conveying the rubber material to an open mill, turning and cooling the rubber material, and standing the curled rubber material for 6-8h to obtain the second-stage master batch.

(4) And (3) a final refining process: adding the two-stage masterbatch, sulfur, an accelerator, a scorch retarder CTP and a functional modifier DC-01 into an internal mixer according to a filling coefficient of 70-75%, mixing, discharging rubber to an open mill, turning and cooling rubber materials to obtain the low-heat-generation tread rubber of the all-steel giant engineering radial tire for coal mine transportation, and then winding and storing the rubber materials. The specific method comprises the following steps:

1) keeping the speed of a GK270N internal mixer at low speed of 30rpm and the top plug pressure at 30N/cm²；

2) Adding the two-stage masterbatch obtained in the step (3), sulfur, an accelerator, a scorch retarder CTP and a functional modifier DC-01 into an internal mixer for mixing according to a filling coefficient of 70-75%;

3) pressing the top bolt for 30 seconds, and lifting the top bolt for 10 seconds;

4) pressing a top bolt to heat the rubber material to 105 ℃, lifting the bolt and removing the glue;

5) and (3) discharging the rubber to an open mill, turning and cooling the rubber material to obtain the low-heat-generation tread rubber of the all-steel giant engineering radial tire for coal mine transportation, and then curling and storing the rubber material.

Comparative example and effect analysis, the existing tread rubber formula is compared with the low heat generation tread formula prepared by adopting the proportion. Specific test data are shown in table 1.

The physical and mechanical performance tests of other vulcanized rubber performances except the cutting resistance and the heat conductivity coefficient performance of the rubber are carried out according to the national standard, and the test data are as follows:

TABLE 1 Property data of the vulcanizates

Wherein, 1) cutting resistance performance test: the testing principle is as follows when the RCC-1 type rubber dynamic cut-resistant testing machine is used for detection: a specially designed tool bit is used to impact the rotating round wheel-shaped rubber sample repeatedly with certain energy. The simulation rubber is collided with a sharp object with a considerable force, the surface is penetrated or cut, or the tire tread is on a rough and sharp road surface, and the conditions of cutting tearing, chipping and the like caused by traction or braking are solved. The test results are expressed as the weight difference between the rubber samples before and after the test and are carried out according to the enterprise standard. Rotating speed of 720 r.min^－1Impact frequency 120. min^－1. Test forThe testing time is 20min, the cutting loss rate is expressed by the mass loss percentage before and after the test, and the lower the numerical value, the better the cutting resistance.

2) Testing the heat conductivity coefficient performance of the rubber: the testing principle is that the testing method is a transient method, the temperature change rate of the surface of a test piece is acquired at a high speed by utilizing the physical characteristic of unsteady heat transfer of a test sample and a testing film with a heating and high-precision temperature sensor, and the higher the value is, the better the heat conductivity is.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that a person skilled in the art may make several changes, improvements and modifications without departing from the spirit of the present invention, and these changes, improvements and modifications should be construed as the protection scope of the present invention.