Wear-resistant and cut-resistant rubber crawler for industrial machinery and preparation method thereof

Abstract

The present invention discloses a wear-resistant and cut-resistant rubber track for industrial machinery, including the preparation of a wear-resistant and cut-resistant rubber composition, aiming at the problems of poor wear resistance and cut resistance of existing traditional rubber tracks, easy damage of patterns, uneven grinding surfaces, serious chipping and block falling, early failure caused by hard object cutting, short service life, etc. By adjusting the composition ratio of each component of the rubber track compound formula and optimizing the preparation process conditions, excellent wear resistance and cut resistance required for high-performance industrial machinery rubber tracks when adapting to harsh road conditions are achieved, while maintaining the physical and mechanical properties and other mechanical properties without reduction, and the preparation process is simple and the comprehensive use cost is low.

Description

Technical field:

[0001] The present invention relates to the field of rubber crawler tracks and preparation methods, and in particular to a wear-resistant and cut-resistant rubber crawler track for industrial machinery and a preparation method. Background technology:

[0002] Traditional rubber tracks have obvious deficiencies in wear resistance and cutting resistance. The track pattern is easily damaged, the grinding surface is uneven, and the phenomenon of chipping and falling is serious. When the rubber is cut by hard objects, moisture easily enters the joints between the rubber and the core gold and other skeleton materials, causing the skeleton material to rust, which in turn affects the bonding strength with the rubber, resulting in early failure of the rubber track and shortening the service life of the rubber track. In order to improve the various properties of rubber tracks, researchers have continuously improved and optimized the components of the various compositions used to prepare rubber tracks, in order to further improve the performance of rubber tracks and broaden their application range.

[0003] For example, the Chinese patent application publication number CN 114539637 A discloses "A cut-resistant rubber track for construction machinery and a preparation method thereof". The present invention relates to the field of polymer materials, specifically a cut-resistant rubber track for construction machinery and a preparation method thereof, comprising a rubber material, a core gold, and a cord. The characteristic is that the rubber material comprises the following components: natural rubber, butadiene rubber, solution-polymerized styrene-butadiene rubber, coumarone resin, styrene resin, carbon black, white carbon black, core-shell structure filler, tear inhibitor, stearic acid, cerium sorbate, sulfur, and an accelerator. The rubber material prepared by the present invention has good mechanical properties, wear resistance, and good cut resistance. It can be used to make rubber tracks and can meet the use requirements.

[0004] There is also a Chinese patent publication number for improving rubber tracks, CN 116178804 A, which discloses "A rubber track with high wear resistance on the inner side and a preparation method thereof". The present invention discloses a rubber track with high wear resistance on the inner side and a preparation method thereof, which relates to the technical field of rubber tracks. The rubber track with high wear resistance on the inner side includes a pattern side rubber layer and a wheel side rubber layer, and a skeleton layer arranged between the pattern side rubber layer and the wheel side rubber layer; the wheel side rubber layer includes 100 parts of raw rubber component, 25-35 parts of reinforcing and filling component, 5-15 parts of auxiliary component, 0.5-1.5 parts of vulcanizing agent and 1-2 parts of accelerator: the raw rubber component includes NR, SBR, NBR; the reinforcing and filling component includes medium and super wear-resistant carbon black, high wear-resistant carbon black and white carbon black. The invention uses NR / NBR / SBR three rubbers and carbon black and white carbon black in combination, thereby increasing the elongation at break and tensile strength of the system as a whole compared with the existing system, while improving the wear resistance and puncture resistance of the product, and solving the problem of the poor wear resistance of the inner side of the existing crawler.

[0005] For another example, Chinese Patent Publication No. CN 112876747 B, "A High-Temperature-Resistant and UV-Resistant Rubber, Rubber Track and Its Preparation Method", the present invention belongs to the field of rubber, and particularly relates to a high-temperature-resistant and UV-resistant rubber, rubber track and its preparation method. Specifically, the present invention relates to a composition for preparing rubber, rubber obtained by refining the composition, and a rubber track containing the rubber. The present invention also relates to a method for preparing the rubber or rubber track.

[0006] Chinese Patent Publication No. CN 113512237 A, "A High-Strength and Tear-Resistant Rubber Track", the present invention discloses a high-strength and tear-resistant rubber track in the technical field of rubber preparation, which includes the following raw materials in parts by weight: 100 parts of raw rubber, 1-3 parts of stearic acid, 0.5-3 parts of vulcanization accelerator, 2-8 parts of homogenized tear-resistant agent, 1-5 parts of magnesium oxide, 4-15 parts of aromatic oil, 0.5-3 parts of antioxidant, 10-60 parts of carbon black, 5-25 parts of white carbon black, 2-15 parts of carbon nanotubes, 1-8 parts of silane coupling agent, 0.5-3 parts of anti-scorching agent PVI, 1-5 parts of flame retardant and 1-5 parts of light stabilizer, meeting the requirements of high-strength and tear-resistance of the rubber track. According to the types and proportions of each component, adjust the raw material preparation, plasticization, mixing and packing and slicing of the rubber preparation method to improve the tear resistance of the rubber. And so on, not to mention one by one.

[0007] It can be seen from the technical solutions disclosed in the above-mentioned invention patent applications that a variety of rubber track products with different performance characteristics have been successfully developed for diverse performance requirements. However, for the characteristics of rubber track products with different improvement requirements, the difficulty in formula design lies in that high-performance industrial machinery rubber tracks need excellent wear resistance and cut resistance when adapting to harsh road conditions, and the physical and mechanical properties and other mechanical properties cannot be reduced.

[0008] Therefore, aiming at the problems of poor wear resistance and cut resistance of existing traditional rubber tracks, easy damage to the pattern, serious chipping and block falling, early failure caused by hard object cutting and short service life, etc., a high-performance wear-resistant and cut-resistant rubber track for industrial machinery and its preparation method are proposed.

[0009] The wear resistance of the rubber crawler compound mainly depends on the ability of the polymer material to resist cyclic stress and frictional force; the cut resistance mainly depends on the impact resistance of the polymer material, which involves two stages: crack initiation and propagation. Any factor that can affect the initiation energy and propagation energy of the polymer material will have a significant impact on the cut resistance of the compound. Therefore, by designing and optimizing the composition ratio of each component of the rubber crawler compound formula and optimizing the preparation process conditions, the prepared high-performance industrial machinery rubber crawler exhibits excellent wear resistance and cut resistance when adapting to harsh road conditions, while maintaining good physical and mechanical properties and other mechanical properties. In addition, the preparation process is simple and the comprehensive use cost is low, providing a reliable and economical solution for the industrial machinery field with a low comprehensive use cost. Summary of the Invention:

[0010] The present invention provides a wear-resistant and cut-resistant rubber crawler for industrial machinery, including the preparation of a wear-resistant and cut-resistant rubber composition, aiming at the problems of poor wear resistance and cut resistance of existing traditional rubber crawlers, easy damage of the tread pattern, uneven grinding surface, serious chipping and block falling, early failure caused by hard object cutting, and short service life. By adjusting the composition ratio of each component of the rubber crawler compound formula and optimizing the preparation process conditions, the excellent wear resistance and cut resistance required by the high-performance industrial machinery rubber crawler when adapting to harsh road conditions are achieved, while maintaining the physical and mechanical properties and other mechanical properties without reduction, and the preparation process is simple and the comprehensive use cost is low.

[0011] A wear-resistant and cut-resistant rubber crawler for industrial machinery disclosed by the present invention includes the preparation of a wear-resistant and cut-resistant rubber composition, a core metal, and cord. Among them, the wear-resistant and cut-resistant rubber composition includes the following mass composition components: 20-90 parts of natural rubber, 10-90 parts of cut-resistant premix rubber, 50-70 parts of carbon black, 5-15 parts of silica, 1-3.5 parts of sulfur, 1-2.5 parts of accelerator, 1.5-5.5 parts of anti-tear resin, 6-20 parts of wear-resistant reinforcing filler, and 0.16-0.4 parts of activator.

[0012] For the wear-resistant and cut-resistant rubber crawler for industrial machinery, the wear-resistant and cut-resistant rubber composition includes the following mass components: 60-90 parts of natural rubber, 60-90 parts of cut-resistant premix rubber, 60-75 parts of carbon black, 6-10 parts of silica, 1.5-2.5 parts of sulfur, 1.5-2 parts of accelerator, 2-4 parts of anti-tear resin, 12-16 parts of wear-resistant reinforcing filler, and 0.16-0.35 parts of activator.

[0013] Preferably, the sulfur is insoluble sulfur and the accelerator is a sulfenamide + guanidine accelerator.

[0014] Preferably, the cut-resistant premixed rubber is prepared by mixing styrene-butadiene rubber and nitrile rubber in a mass ratio of 50-80:1-5 and then mixing with a mixed solvent.

[0015] Furthermore, the wear-resistant reinforcing filler is prepared by mixing a rubber wear-resistant agent and layered magnesium hydroxide in a mass ratio of 3-5:1.

[0016] For the wear-resistant and cut-resistant rubber crawler for industrial machinery, the active agent is a mixture of lanthanum stearate and zinc acetate.

[0017] For the wear-resistant and cut-resistant rubber crawler for industrial machinery, the rubber wear-resistant agent is a mixture of 70-80% polytetrafluoroethylene micropowder and 30-20% nitrile rubber pre-dispersed carrier, and the density (20 °C) of the rubber wear-resistant agent is controlled to be 1.55-1.75 g / cm 3 。

[0018] Another object of the present invention discloses a preparation method of the wear-resistant and cut-resistant rubber crawler for industrial machinery, which includes the following method steps:

[0019] 1) Premixing treatment to prepare cut-resistant plasticized rubber stock. Styrene-butadiene rubber and nitrile rubber in mass ratio components and the mixed solvent are placed in a mixer device for mixing treatment, and then transferred to an open mill device for further open mill rolling treatment to obtain cut-resistant premixed rubber.

[0020] 2) First-stage mixing,

[0021] The cut-resistant premixed rubber obtained in step 1) and natural rubber, carbon black, white carbon black, tear-resistant resin, and wear-resistant reinforcing filler in mass ratio components are placed in a mixer device; start the mixer device for mixing treatment, and then transfer to an open mill device for further open mill rolling treatment to obtain first-stage mixed rubber stock.

[0022] 3) Second-stage mixing,

[0023] The first-stage mixed rubber stock obtained in step 2) and the active agent in mass ratio components are mixed and placed in a mixer device; start the mixer device for mixing treatment, and then transfer to an open mill device for further open mill rolling treatment to obtain second-stage mixed rubber stock.

[0024] 4) Remixing. The second-stage mixed rubber stock obtained in step 3) and sulfur and accelerator in mass ratio are mixed and placed in a mixer device; start the mixer device for mixing treatment, and then transfer to an open mill device for further open mill rolling treatment to obtain wear-resistant and cut-resistant rubber composition.

[0025] 5) Plate vulcanization,

[0026] Place the wear-resistant and cut-resistant rubber composition, core wire, and cord prepared in step 4) in a flat plate vulcanizing machine device, and under the conditions of 5-20 Mpa and a temperature of 140-160 °C, vulcanize for 40-80 minutes to obtain a wear-resistant and cut-resistant rubber crawler.

[0027] In the method described, in step 1), the kneading treatment is as follows: for the component ratio materials during the premixing treatment in step 1), add a pressure weight in the kneading machine device, control the holding time of the pressure weight to be 180-195 s; then perform the pressure weight lifting treatment, with the holding time of the pressure weight lifting being 230-260 s, then raise the temperature to 140-150 °C for discharging the rubber, and then transfer it to the open mill device for open mill rolling treatment. Adjust the roll gap of the open mill device to 7-8 mm, and after uniformly rolling through wrapping the roll, cut with the left and right cutters, cut off, and knead 4-6 times, and then roll it up; then adjust the roll gap to within 1 mm, thin pass and make a triangular package, and let it stand for 4-48 h; this is the cut-resistant premixed rubber; the mixed solvent is a mixture of ethyl acetate, methanol, and acetone in equal mass ratios.

[0028] In the method described, in step 2), for the first-stage mixing and kneading treatment, for the components during the first-stage mixing, place them in the kneading machine device, add a pressure weight, control the holding time of the pressure weight to be 200-215 s, after lifting the pressure weight and cleaning, control the holding time of the pressure weight lifting to be 115-125 s; then lift the pressure weight again, and keep the pressure weight lifted for 110-130 s, then raise the temperature to 165-175 °C and discharge the rubber; transfer it to the open mill device for open mill rolling treatment, adjust the roll gap of the open mill device to 8-10 mm, and after uniformly rolling through wrapping the roll, cut with the left and right cutters, cut off, and knead 5-7 times, and then take out the sheet and let it stand for 4-48 h to obtain the first-stage mixed rubber compound.

[0029] In the method described, in step 3), for the second-stage mixing and kneading treatment, place the component composition materials during the second-stage mixing treatment in the kneading machine device, with the holding time of the pressure weight added being 170-190 s, after lifting the pressure weight, controlling the holding time of the pressure weight lifting to be 40-60 s, and lifting the pressure weight again, then raise the temperature to 145-155 °C and discharge the rubber; transfer it to the open mill device, adjust the roll gap of the open mill device to 8-10 mm, and after uniformly rolling through wrapping the roll, cut with the left and right cutters, cut off, and knead 2-4 times, and then take out the sheet and let it stand for 4-48 h to obtain the second-stage mixed rubber compound.

[0030] Further, in the method, in step 4) refining and internal mixing treatment: during the refining treatment in step 4), the composition materials of each component are placed in an internal mixer device. The charging weight is kept for 80 - 95 s, then the weight is lifted and kept for 5 - 8 s, then the weight is kept for 50 - 65 s, then the weight is lifted again, and then the temperature is raised to 95 - 110 °C for discharging the rubber. Then it is transferred to an open mill device, the roll gap of the open mill device is adjusted to 5 - 7 mm, and it is rolled evenly by wrapping the roll. The left and right cutting knives are used for cutting, dropping, and kneading 2 - 3 times, and then the sheet is taken out and parked for 4 - 48 h to obtain the wear-resistant and cut-resistant rubber composition.

[0031] Preferably, in the method, the model of the internal mixer device is X(S)N - 110 / 30 internal mixer, the rotor speed is controlled at 30 - 45 r·min-1, the pressure is 0.4 - 0.8 MPa, and the initial temperature of the internal mixing chamber is controlled at 55 - 65 °C; the model of the open mill device is X(S)K - 550 open rubber mill, the speed ratio of the front and rear rollers of the open rubber mill is controlled at 1:1.19; the linear speed of the front roller is controlled at 27 - 30 m / min, the temperature of the front roller is 55 - 65 °C, and the temperature of the rear roller is 50 - 60 °C.

[0032] An industrial machinery wear-resistant and cut-resistant rubber crawler and a preparation method disclosed by the present invention have the following beneficial effects: for the prepared wear-resistant and cut-resistant rubber composition, the cutting amount is reduced by about 30%, and the Akron abrasion loss is reduced by 20%, while other properties are slightly improved or have little difference. The prepared rubber crawler is applied to industrial machinery, and during actual use, the wear-resistant and cut-resistant properties of the rubber crawler are significantly improved. After market road tests, the grinding surface of the rubber crawler is smooth, and the service life is increased by more than 15%. This is mainly because the components used in the present invention are optimized. For example, in the raw rubber system design: the amount of natural rubber is reduced, the amount of styrene-butadiene rubber is increased, and a small amount of nitrile rubber is applied. Because the internal friction of the styrene-butadiene rubber chain segment is large and the cohesive strength is high, it can inhibit the formation of cracks. Its styrene group can not only improve the strength of the main chain but also stabilize the free radical chain reaction caused by thermo-oxidative and mechanochemical reactions; after adding a small amount of nitrile rubber, the strong polar cyano group can endow the cut-resistant premix rubber with good polarity and strengthen the intermolecular interaction force, thereby reducing the rate of mechanochemical damage of the material. In the filler system optimization: white carbon black is used to improve the anti-cutting performance. Compared with carbon black, white carbon black has a high surface energy and can consume more deformation energy during the deformation process to inhibit the growth of cracks.

[0033] The improvement of the toughness of the rubber compound is beneficial to the improvement of wear resistance and cut resistance. When the content of polysulfide bonds in the vulcanized rubber increases, the density of the rubber compound may decrease to a certain extent. The increase in the content of polysulfide bonds can better disperse the impact energy and inhibit the formation and growth of cracks. In addition, the addition of rubber wear-resistant agent and magnesium hydroxide forms physical cross-linking points between the dispersed particles in the matrix phase and the rubber molecular chains, enhancing the intermolecular binding force, improving the impact resistance and toughness of the material, and thus improving the wear resistance of the material.

[0034] Optimization of the filling system of the present invention: Using silica to improve the cut resistance. Compared with carbon black, silica has a high surface energy and can consume more deformation energy during the deformation process, inhibiting the growth of cracks. At the same time, the present invention adds trace amounts of activators, lanthanum stearate and zinc acetate. The zinc ions in zinc acetate and the lanthanum ions in lanthanum stearate are combined with each other through coordination bonds, forming a synergistic effect that causes the internal lattice structure of the material to be adjusted, making the rubber compound show a more uniform and dense distribution at the microscale, enhancing the dispersibility of each component, and increasing the crosslinking density and vulcanization crosslinking degree of each component in natural rubber. Thus, the wear resistance of the rubber track for industrial machinery prepared is greatly improved, the prepared rubber track is not easily cut by hard objects, and the adhesion strength between the skeleton material and the rubber compound is protected from being invaded by water vapor, resulting in early failure of the rubber track. Specific data are shown in the further description of the following embodiments. The measurement methods of the performance parameters of the present invention can refer to the methods commonly used in the art, such as the methods specified in GB / T 528-2009, GB / T 3512-2014, GB / T 20028-2005, GB / T 16585-1996, etc. Brief description of the drawings:

[0035] Figure 1 , is a comparison chart of the pattern wear test of the wear-resistant and cut-resistant rubber track for industrial machinery prepared in the embodiment of the present invention and the rubber tracks prepared in the comparative example and the prior art;

[0036] Figure 2 , is a comparison chart of the pattern wound test of the wear-resistant and cut-resistant rubber track for industrial machinery prepared in the embodiment of the present invention and the rubber tracks prepared in the comparative example and the prior art.

[0037] Description: Figure 1 There are 5 groups of pictures in the comparison chart of the pattern wear test of, which are divided into the 1st to 5th groups of pictures from left to right. Each column data from left to right in each group of pictures corresponds to and shows the corresponding data of Examples 1-5 and Comparative Examples 1-4 respectively.

[0038] In the 1st group of pictures, the corresponding data values of the pattern heights of the rubber tracks before the test of Examples 1-5 and Comparative Examples 1-4 are shown from left to right, unit, mm;

[0039] In the second group of pictures, the corresponding data values of the pattern heights of the test rubber crawlers after 500 hours of installation testing for Examples 1-5 and Comparative Examples 1-4 are shown from left to right, with the unit being mm;

[0040] In the third group of pictures, the corresponding data values of the pattern descent heights of the test rubber crawlers after 500 hours of installation testing for Examples 1-5 and Comparative Examples 1-4 are shown from left to right, with the unit being mm;

[0041] In the fourth group of pictures, the corresponding data values of the pattern height descent ratios of the test rubber crawlers after 500 hours of installation testing for Examples 1-5 and Comparative Examples 1-4 are shown from left to right, with the unit being %;

[0042] In the fifth group of pictures, the corresponding data values of the pattern descent heights of the test rubber crawlers after 100 hours of installation testing for Examples 1-5 and Comparative Examples 1-4 are shown from left to right, with the unit being mm.

[0043] Figure 2 There are 3 groups in the comparison diagram of the pattern wounds. They are divided into the first to the third groups of pictures from left to right. And for each column data from left to right in each group of pictures, the corresponding data of Examples 1-5 and Comparative Examples 1-4 are respectively shown.

[0044] In the first group of pictures, the number of wounds exceeding 20 mm in the pattern wound test for Examples 1-5 and Comparative Examples 1-4 are shown from left to right, with the unit being pcs;

[0045] In the second group of pictures, the number of wounds exceeding 30 mm in the pattern wound test for Examples 1-5 and Comparative Examples 1-4 are shown from left to right, with the unit being pcs;

[0046] In the third group of pictures, the lengths of the wounds exceeding the average wound length in the pattern wound test for Examples 1-5 and Comparative Examples 1-4 are shown from left to right, with the unit being mm; Specific embodiments:

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The present invention is not limited to the embodiments. Each component of the present invention can be obtained commercially. For the components where no description is given, the amounts are in parts by mass or mass ratio.

[0048] A wear-resistant and cut-resistant rubber track for industrial machinery disclosed by the present invention includes a preparation of a wear-resistant and cut-resistant rubber composition, and the preparation of the wear-resistant and cut-resistant rubber composition comprises the following mass components: 20-90 parts of natural rubber, 40-90 parts of cut-resistant premixed rubber, 50-70 parts of carbon black, 5-15 parts of silica, 1-3.5 parts of sulfur, 1-2.5 parts of accelerator, 1.5-5.5 parts of tear-resistant resin, 6-20 parts of wear-resistant reinforcing filler, and 0.16-0.4 parts of activator.

[0049] Preferably, the preparation of the wear-resistant and cut-resistant rubber composition comprises the following mass parts: 60-90 parts of natural rubber, 60-90 parts of cut-resistant premixed rubber, 60 parts of carbon black, 6-10 parts of silica, 1.5-2.5 parts of sulfur, 1.5-2 parts of accelerator, 2-4 parts of tear-resistant resin, 12-16 parts of wear-resistant reinforcing filler, and 0.16-0.35 parts of activator.

[0050] The sulfur is insoluble sulfur, and the accelerator system is sulfenamide + guanidine accelerator.

[0051] Preferably, the cut-resistant premixed rubber is prepared by mixing styrene-butadiene rubber and nitrile rubber in a mass ratio of 50-80:1-5 and a mixed solvent; the mixed solvent is a mixture of ethyl acetate, methanol and acetone in equal mass proportions.

[0052] Furthermore, the wear-resistant reinforcing filler is prepared by mixing a rubber wear-resistant agent and layered magnesium hydroxide in a mass ratio of 3-5:1.

[0053] The activator is a mixture of lanthanum stearate and zinc acetate. The rubber wear-resistant agent is a mixture of 70-80% polytetrafluoroethylene micropowder and 30-20% nitrile rubber pre-dispersed carrier, and is gray or grayish-black particles; the density of the rubber wear-resistant agent (at 20 °C) is controlled to be 1.55-1.75 g / cm3. That is, the density value at a temperature of 20 °C.

[0054] Another object of the present invention is to disclose a preparation method of the wear-resistant and cut-resistant rubber track for industrial machinery, which specifically comprises the following method steps:

[0055] 1) Premixing, or premix treatment, involves placing styrene-butadiene rubber and nitrile-butadiene rubber with components in a mass ratio together with a mixed solvent in a Banbury mixer for Banbury mixing treatment. The mixed solvent is a mixture of ethyl acetate, methanol, and acetone in equal mass proportions. The amount of the mixed solvent added is controlled to ensure that the styrene-butadiene rubber and nitrile-butadiene rubber can be fully dissolved, and an appropriate amount is added. A feeding weight is applied in the Banbury mixer, and the holding time of the feeding weight is controlled to be 180 - 195 s. Then, the weight is lifted, and the holding time of lifting the weight is 230 - 260 s. Then, the temperature is raised to 140 - 150 °C for discharging the rubber. Then, it is transferred to an open mill for open mill rolling treatment. The roll gap of the open mill is adjusted to 7 - 8 mm, and after being evenly rolled by wrapping the roll, it is cut with a left and right cutter, cut off, kneaded 4 - 6 times, and then rolled into a coil. Then, the roll gap is adjusted to within 1 mm, passed through thinly and rolled into a triangular package, and left to stand for 4 - 48 h to obtain the cut-resistant premixed rubber.

[0056] 2) First-stage mixing,

[0057] Place the cut-resistant premixed rubber obtained in step 1) and carbon black, white carbon black, tear-resistant resin, and wear-resistant reinforcing filler with components in a mass ratio in a Banbury mixer. The wear-resistant reinforcing filler is prepared by mixing rubber wear-resistant agent and layered magnesium hydroxide in a mass ratio of 3 - 5:1. The rubber wear-resistant agent is a mixture of 70 - 80% polytetrafluoroethylene micropowder and 30 - 20% nitrile-butadiene rubber pre-dispersed carrier, and the density of the rubber wear-resistant agent at 20 °C is controlled to be 1.55 - 1.75 g / cm3. Start the Banbury mixer for Banbury mixing treatment, and then transfer it to an open mill for further open mill rolling treatment to obtain the first-stage mixed rubber compound. The specific control parameters are for Banbury mixing treatment. For the above components in each mass ratio, in the Banbury mixer, after applying the feeding weight, the holding time of the feeding weight is controlled to be 200 - 215 s. After lifting the weight and cleaning, the holding time of lifting the weight is controlled to be 115 - 125 s. Then lift the weight again, and control the holding time of lifting the weight again to be 110 - 130 s. Then, the temperature is raised to 155 - 175 °C for discharging the rubber. Transfer it to an open mill for open mill rolling treatment. Adjust the roll gap of the open mill to 8 - 10 mm, and after being evenly rolled by wrapping the roll, cut with a left and right cutter, cut off, knead 5 - 7 times, and then sheet out and leave to stand for 4 - 48 h to obtain the first-stage mixed rubber compound.

[0058] 3) Second-stage mixing,

[0059] Mix a section of kneaded rubber compound and an activator with the component mass ratio, and place them in a Banbury mixer device; start the Banbury mixer device for Banbury mixing, and then transfer it to an open mill device for further open mill rolling treatment to produce a second-stage kneaded rubber compound; specifically, place the above-mentioned component materials in the Banbury mixer device, keep the feeding weight for 170 - 190 s, lift the weight, control the holding time of the lifted weight for 40 - 60 s, lift the weight again, then heat up to 145 - 155 °C and discharge the rubber; transfer to the open mill device, adjust the roll gap of the open mill device to 8 - 10 mm, roll evenly through covering the roll, cut with left and right cutters, cut off, knead 2 - 4 times, then take out the sheet and let it stand for 4 - 48 h to obtain the second-stage kneaded rubber compound.

[0060] 4) Remixing: Mix the second-stage kneaded rubber compound from step 3) and sulfur and accelerator with the component mass ratio, and place them in a Banbury mixer device; start the Banbury mixer device for Banbury mixing, and then transfer it to an open mill device for further open mill rolling treatment to produce a remixed rubber compound; specifically, place the above-mentioned component materials in the Banbury mixer device, add the feeding weight, keep the feeding weight holding time for 80 - 95 s, then lift the weight, control the holding time of the lifted weight for 5 - 8 s, then press the weight and keep it for 50 - 65 s, lift the weight again, then heat up to 95 - 110 °C and discharge the rubber, transfer to the open mill device, adjust the roll gap of the open mill device to 5 - 7 mm, roll evenly through covering the roll, cut with left and right cutters, cut off, knead 2 - 3 times, then take out the sheet and let it stand for 4 - 48 h, which is the wear-resistant and cut-resistant rubber composition.

[0061] 5) Plate vulcanization

[0062] Place the remixed rubber compound, core metal, cord, etc. prepared in step 4) in a plate vulcanizer device, and vulcanize at 5 - 20 Mpa and 140 - 160 °C for 40 - 80 minutes to prepare the wear-resistant and cut-resistant rubber track.

[0063] The model of the Banbury mixer device is X(S)N - 110 / 30 Banbury mixer, control the rotor speed at 30 - 45 r·min-1, the pressure at 0.4 - 0.8 MPa, and control the initial temperature of the Banbury chamber at 55 - 65 °C; the model of the open mill device is X(S)K - 550 open rubber mill, control the speed ratio of the front and rear rollers of the open rubber mill at 1:1.19; control the front roller linear speed at 27 - 30 m / min, the front roller temperature at 55 - 65 °C, and the rear roller temperature at 50 - 60 °C.

[0064] The following examples are all prepared according to the above specific method, while the comparative examples are prepared by the prior art method. The following test data are obtained from the actual measurement of the rubber track prepared by the present invention used in construction machinery.

[0065] Examples

[0066] As shown in Table 1 below, the components involved in the specific embodiments of the present invention can all be obtained commercially.

[0067]

[0068] Note 1: In Examples 1 and 2, the rubber wear-resistant agent is a mixture of 70% polytetrafluoroethylene micropowder and 30% nitrile rubber pre-dispersed carrier, and the density of the rubber wear-resistant agent (at 20 °C) is controlled to be 1.65 g / cm3. In Examples 3, 4, and 5, the rubber wear-resistant agent is a mixture of 75% polytetrafluoroethylene micropowder and 25% nitrile rubber pre-dispersed carrier, and the density of the rubber wear-resistant agent (at 20 °C) is controlled to be 1.67 g / cm3. The accelerator used, which is a combination of sulfenamide + guanidine accelerator, can all be obtained commercially. For example, the trade name of the guanidine accelerator is Accelerator D, and the trade names of the sulfenamide accelerators are Accelerator CZ and Accelerator TBBS, etc. The sulfenamide is the main accelerator and the guanidine is the secondary accelerator.

[0069] Note 2: The appropriate amount of the mixed solvent added in the above examples means that the added mixed solvent can ensure sufficient mixing and kneading fusion. Generally, the mass of the added mixed solvent is about 1% of the mass ratio of styrene-butadiene rubber and nitrile rubber.

[0070] Note 3: The specific preparation methods in the above embodiments of the present invention are carried out, but there are differences in the preparation methods of each embodiment. The comparative examples are carried out according to the existing technical solutions.

[0071] Using the component compositions and preparation methods with the above mass ratios of the present invention to prepare wear-resistant and cut-resistant rubber track compositions and core wires, cords, etc. for preparing rubber track materials, the wear-resistant and cut-resistant rubber tracks for industrial machinery prepared are tested for their physical properties, and the results are as shown in the attached Figure 1 as shown in Table 2 below.

[0072] Table 2, test data:

[0073]

[0074] Note: From the test data in Table 2 above, it can be seen that the cut-resistant rubber tracks for industrial and agricultural engineering machinery prepared by the present invention have excellent cut-resistant performance.

[0075] Table 3 below is the pattern wear test report, that is, the data report for 500 hours of installation height.

[0076] Table 3, pattern wear test report

[0077]

[0078] Note: The data described in Table 3 above corresponds to the attached Figure 1 of the specification.

[0079] Table 4 below is the test report of the patterned wound, which is the data report of 500 hours of installation height. That is, the rubber crawler of the present invention is installed on industrial and agricultural engineering machinery, and the data values of 500 hours of installation work test. It mainly represents the data such as the number of wounds exceeding 20 mm, the number of wounds exceeding 30 mm, and the average number of wounds under the above working conditions.

[0080] Table 4, Test Report of Patterned Wound

[0081]

[0082] Note: For the test methods of the performance parameters of the above test reports, relevant national standards or industry standards can be referred to. It can be seen from the above test data that the wear-resistant and cut-resistant rubber crawlers for industrial machinery prepared by the rubber component compositions and methods disclosed in the present invention have significantly improved wear-resistant and cut-resistant performance. The Akron abrasion of the rubber crawler is reduced by about 20%, and the cutting amount is reduced by about 30%. Under the road surface conditions of the same working conditions, the service life of the rubber crawler can be increased by more than 15% accordingly. This can reduce the product replacement frequency and promote the sustainable development of the rubber industry. It effectively saves resources.

Claims

1. A wear-resistant and cut-resistant rubber crawler for industrial machinery, comprising preparing a wear-resistant and cut-resistant rubber composition, a core metal, and a cord, characterized in that: The wear-resistant and cut-resistant rubber composition comprises the following components by weight: 20-90 parts of natural rubber, 10-90 parts of cut-resistant premixed rubber, 50-70 parts of carbon black, 5-15 parts of white carbon black, 1-3.5 parts of sulfur, 1-2.5 parts of accelerator, 1.5-5.5 parts of tear-resistant resin, 6-20 parts of wear-resistant reinforcing filler, and 0.16-0.4 parts of active agent; The sulfur is insoluble sulfur, and the accelerator is sulfenamide + guanidine accelerator; The cut-resistant premixed rubber is prepared by mixing styrene-butadiene rubber and nitrile rubber in a mass ratio of 50-80:1-5 and then mixing with a mixed solvent; The wear-resistant reinforcing filler is prepared by mixing a rubber wear-resistant agent and layered magnesium hydroxide in a mass ratio of 3-5:1; The rubber wear-resistant agent is a mixture of 70-80% polytetrafluoroethylene powder and 30-20% nitrile rubber pre-dispersed carrier, and the density of the rubber wear-resistant agent is controlled to be 1.55-1.75g / cm3 at 20°C; The active agent is a mixture of lanthanum stearate and zinc acetate; A method for preparing a wear-resistant and cut-resistant rubber track for industrial machinery comprises the following steps: 1) Premixing treatment to prepare a cut-resistant plasticized rubber compound, placing the styrene-butadiene rubber and nitrile-butadiene rubber of the mass ratio components together with a mixed solvent in an internal mixer for internal mixing treatment, and then transferring to an open mixer for further open mixing and rolling treatment to obtain a cut-resistant premixed rubber; 2) One stage mixing, The cut-resistant premixed rubber of step 1) and the natural rubber, carbon black, white carbon black, tear-resistant resin and wear-resistant reinforcing filler of the components in mass ratio are placed in an internal mixer; the internal mixer is started to perform internal mixing treatment, and then the mixture is transferred to an open mixer for further open mixing and rolling treatment to prepare a first-stage mixed rubber material; 3) Two-stage mixing, The first-stage mixed rubber material of step 2) and the active agent of the mass ratio component are mixed and placed in an internal mixer; the internal mixer is started to perform internal mixing treatment, and then the mixture is transferred to an open mixer for further open mixing and rolling treatment to prepare a second-stage mixed rubber material; 4) refining, mixing the second-stage mixed rubber material of step 3) and the sulfur and accelerator in a mass ratio, and placing them in an internal mixer; starting the internal mixer to perform internal mixing treatment, and then transferring to an open mixer for further open mixing and rolling treatment to prepare a wear-resistant and cut-resistant rubber composition; 5) Flat plate vulcanization, The wear-resistant and cut-resistant rubber composition, core gold and cord prepared in step 4) are placed in a flat plate vulcanizer device, and vulcanized for 40-80 minutes at 5-20Mpa and 140-160°C to prepare a wear-resistant and cut-resistant rubber track; In step 1), the internal mixing treatment is: the materials of each group in the premixing treatment of step 1) are added to the internal mixer device and pressed, and the pressing time of the adding pressing is controlled to be 180-195 seconds; then the pressing is carried out, and the pressing time is 230-260 seconds, and then the temperature is raised to 140-150°C for rubber removal, and then the rubber is transferred to the open mill device for open rolling treatment, and the roller distance of the open mill device is adjusted to 7-8 mm, and the rubber is rolled evenly by the wrapping roller, and the left and right cutters, cutting and tamping are performed 4-6 times, and then the rubber is rolled; then the roller distance is adjusted to within 1 mm, and the thin triangular package is made, and the rubber is parked for 4-48 hours; the cut-resistant premixed rubber is obtained; the mixed solvent is ethyl acetate, methanol and acetone mixed in equal mass proportions; Step 2) a first-stage mixing and internal mixing treatment, the components of the first-stage mixing are combined in an internal mixer device, and the charging pressure roller is controlled to be kept for 200-215s, and the charging pressure roller is lifted and cleaned, and the lifting pressure roller is controlled to be kept for 115-125s; the pressure roller is lifted again, and the pressure roller is lifted and kept for 110-130s, and then the temperature is raised to 165-175℃, and the rubber is discharged; it is transferred to an open mill device and subjected to an open rolling treatment, that is, the roller spacing of the open mill device is adjusted to 8-10 mm, and the rubber is rolled evenly by a wrapped roller, and the rubber is cut by a left and right knife, cut off, and tamped 5-7 times, and then the sheet is produced and parked for 4-48 hours, which is a first-stage mixed rubber material.

2. The wear-resistant and cut-resistant rubber crawler track for industrial machinery according to claim 1, characterized in that The wear-resistant and cut-resistant rubber composition comprises the following components by weight: 60-90 parts of natural rubber, 60-90 parts of cut-resistant premixed rubber, 60-75 parts of carbon black, 6-10 parts of white carbon black, 1.5-2.5 parts of sulfur, 1.5-2 parts of accelerator, 2-4 parts of tear-resistant resin, 12-16 parts of wear-resistant reinforcing filler, and 0.16-0.35 parts of active agent.

3. The wear-resistant and cut-resistant rubber track for industrial machinery according to claim 1, characterized in that: Step 3) two-stage mixing, the internal mixing treatment is: the components of the two-stage mixing treatment are placed in an internal mixer device, the material pressure roller is added and maintained for 170-190s, the pressure roller is raised, the pressure roller is controlled to maintain for 40-60s, the pressure roller is raised, and then the temperature is raised to 145-155℃ and the rubber is discharged; the mixture is transferred to an open mill device, the roller distance of the open mill device is adjusted to 8-10 mm, the mixture is rolled evenly by a wrap roller, the left and right cutters are used, the mixture is cut off and tamped 2-4 times, and then the mixture is discharged and parked for 4-48 hours to obtain a two-stage mixed rubber compound.

4. The wear-resistant and cut-resistant rubber crawler track for industrial machinery according to claim 1, characterized in that: Step 4) refining, the internal mixing treatment is: the materials of step 4) refining treatment and each component are placed in an internal mixer, the material pressure roller is added and kept for 80-95s, the pressure roller is raised and kept for 5-8s, the pressure roller is then kept for 50-65s, the pressure roller is raised again, and the temperature is raised to 95-110°C, the rubber is discharged, and the mixture is transferred to an open mill device, the roller distance of the open mill device is adjusted to 5-7 mm, the mixture is rolled evenly by a wrap roller, the mixture is cut by a left and right knife, cut off, and tamped 2-3 times, and then the mixture is discharged and parked for 4-48 hours to obtain a wear-resistant and cut-resistant rubber composition.

5. The wear-resistant and cut-resistant rubber crawler track for industrial machinery according to claim 4, characterized in that: The internal mixer device model is an X(S)N-110 / 30 internal mixer, the rotor speed is controlled to be 30-45 r·min-1, the pressure is 0.4-0.8 MPa, and the initial temperature of the internal mixer chamber is controlled to be 55-65°C; the open mixer device model is an X(S)K-550 open rubber mixer, the front and rear roller speed ratio of the open rubber mixer is controlled to be 1:1.19; the front roller linear speed is controlled to be 27-30m / min, the front roller temperature is 55-65°C, and the rear roller temperature is 50-60°C.

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