High-definite-elongation and high-wear-resistance rubber material for transmission track and preparation method thereof

Abstract

The invention discloses a high-stretching and high-wear-resistance rubber material for a transmission track and a preparation method thereof, and belongs to the technical field of rubber materials, the high-stretching and high-wear-resistance rubber material comprises the following raw materials by weight: 70-90 parts of natural rubber, 10-30 parts of solution polymerized styrene-butadiene rubber, 50-60 parts of carbon black N23450, 3.5-5 parts of calcined alpha-alumina powder, 2-3 parts of polydimethylsiloxane, 1-3 parts of aromatic oil, and 1-2 parts of microcrystalline wax. The anti-aging agent is prepared from the following components in parts by weight: 1-2 parts of an anti-aging agent RD, 1-2 parts of an anti-aging agent 7F, 2-5 parts of resin, 1-2 parts of an accelerant CZ, 0.5-0.8 part of an accelerant DM-75 and 1-1.5 parts of sodium tripolyphosphate. Through the mode, the hardness of the rubber material is 68.7-70.6 Shore A, the tensile strength is greater than 24.5 MPa, the elongation at break is greater than 561%, the 100% tensile strength at definite elongation is greater than 2.6 MPa, the 300% tensile strength at definite elongation is greater than 12.5 MPa, the AKRON abrasion is less than or equal to 0.29 ml, the low temperature resistance is-45 DEG C * 3 min without cracking, and the ozone resistance is 50 pphm * 40 DEG C * 72 h without cracking. The rubber material has excellent basic physical properties, high stretching, high wear resistance, low temperature resistance and strong ozone resistance, and is suitable for being used as a rubber material for transmission track rubber.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and in particular to a rubber material for a high-elongation and high-wear-resistant transmission crawler and a preparation method thereof. Background Art

[0002] Rubber tracks are a type of crawler walking component with a certain amount of core metal and steel cord embedded in rubber. They have the advantages of low noise, no damage to the road surface, less vibration, and high speed during operation. Rubber tracks have the advantages of good passing performance, low ground pressure, anti-vibration, low noise, and no damage to the road surface. They have greatly expanded the application range of crawler and wheeled mechanical vehicles, and overcome the constraints of various adverse terrain conditions and environments on mechanical equipment. Therefore, they have been rapidly developed and promoted after they were launched, and have gradually been applied to a variety of agricultural machinery, engineering machinery, snow machinery and other fields.

[0003] CN109575375A discloses a rubber material for a rubber track and a preparation method thereof, which is composed of the following raw materials in parts by weight: 30-40 parts of natural rubber, 25-30 parts of styrene-butadiene rubber, 20-25 parts of acrylate rubber, 5-10 parts of carbon black, 0.5-1 part of asphalt, 1-1.5 parts of antioxidant, 3-5 parts of organic modified montmorillonite, 2-5 parts of processing oil, 2-5 parts of anti-ultraviolet absorber, 1-3 parts of vulcanizer, and 1-2 parts of accelerator.

[0004] However, vulcanizing agents are used in its raw materials, and toxic gases are produced during the vulcanization process, which are harmful to the environment and human body; and there is room for improvement in properties such as tensile strength, elongation at break, and AKRON abrasion.

[0005] Based on this, the present invention designs a rubber material for a high-elongation and high-wear-resistant transmission crawler and a preparation method thereof to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a rubber material for a high-elongation and high-wear-resistant transmission crawler and a preparation method thereof.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A rubber material for a high-stretch and high-wear-resistant transmission crawler belt comprises the following raw materials in parts by weight: 70-90 parts of natural rubber, 10-30 parts of solution-polymerized styrene-butadiene rubber, 50-60 parts of carbon black N234, 3.5-5 parts of calcined alpha-alumina powder, 2-3 parts of polydimethylsiloxane, 1-3 parts of aromatic oil, 1-2 parts of microcrystalline wax, 1-2 parts of antioxidant RD, 1-2 parts of antioxidant 7F, 2-5 parts of resin, 1-2 parts of accelerator CZ, 0.5-0.8 parts of accelerator DM-75 and 1-1.5 parts of sodium tripolyphosphate.

[0009] Furthermore, the invention comprises the following raw materials in parts by weight: 70 parts of natural rubber, 30 parts of solution-polymerized styrene-butadiene rubber, 60 parts of carbon black N234, 3.5 parts of calcined α-alumina powder, 3 parts of polydimethylsiloxane, 1 part of aromatic oil, 2 parts of microcrystalline wax, 2 parts of antioxidant RD, 2 parts of antioxidant 7F, 2 parts of resin, 1 part of accelerator CZ, 0.5 parts of accelerator DM-75 and 1.5 parts of sodium tripolyphosphate.

[0010] Furthermore, the invention comprises the following raw materials in parts by weight: 90 parts of natural rubber, 10 parts of solution-polymerized styrene-butadiene rubber, 450 parts of carbon black N234, 5 parts of calcined α-alumina powder, 2 parts of polydimethylsiloxane, 3 parts of aromatic oil, 1 part of microcrystalline wax, 1 part of antioxidant RD, 1 part of antioxidant 7F, 5 parts of resin, 2 parts of accelerator CZ, 0.8 parts of accelerator DM-75 and 1 part of sodium tripolyphosphate.

[0011] Furthermore, the raw materials include the following parts by weight: 80 parts of natural rubber, 20 parts of solution-polymerized styrene-butadiene rubber, 55 parts of carbon black N234, 4 parts of calcined α-alumina powder, 2.6 parts of polydimethylsiloxane, 2.5 parts of aromatic oil, 2 parts of microcrystalline wax, 2 parts of antioxidant RD, 2 parts of antioxidant 7F, 4 parts of resin, 1.4 parts of accelerator CZ, 0.6 parts of accelerator DM-75, and 1.3 parts of sodium tripolyphosphate.

[0012] Furthermore, the brand of the solution-polymerized styrene-butadiene rubber is any one of SSBRT2003, SSBRC2525, and SSBR1000.

[0013] Furthermore, the weight ratio of polydimethylsiloxane to sodium tripolyphosphate is 2:1.

[0014] Furthermore, the following steps are included:

[0015] Step 1: The first stage of plasticization is to plasticize the natural rubber and set it aside for later use;

[0016] Step 2: In the first stage of mixing, natural rubber and solution-polymerized styrene-butadiene rubber are put into an internal mixer and mixed for 40-50 seconds, and then calcined α-alumina powder, polydimethylsiloxane and sodium tripolyphosphate are added and mixed for 40-50 seconds;

[0017] Step 3: The second stage of mixing, add carbon black N234, aromatic oil, microcrystalline wax, antioxidant RD, antioxidant 7F, resin, accelerator CZ, accelerator DM-75 to the materials mixed in the first stage, and mix for the second time. After mixing for 120-140 seconds, the glue is discharged to obtain the product.

[0018] Furthermore, the mixing pressure is 10-12 MPa and the mixing chamber temperature is 35-42°C.

[0019] Furthermore, the debinding temperature is 102-105°C.

[0020] In order to better achieve the purpose of the present invention, the present invention also provides a high-strength and high-wear-resistant rubber material for transmission tracks prepared by the preparation method, the hardness of the rubber material is 68.7-70.6ShoreA, the tensile strength is greater than 24.5MPa, the elongation at break is greater than 561%, the 100% tensile strength is greater than 2.6MPa, the 300% tensile strength is greater than 12.5MPa, the AKRON abrasion is ≤0.29ml, the low temperature resistance is -45℃*3min without cracking, and the ozone resistance is 50pphm×40℃×72h without cracking.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the hardness of the rubber material of the present invention is between 68.7-70.6 Shore A, the tensile strength is greater than 24.5 MPa, the elongation at break is greater than 561%, the 100% tensile strength is greater than 2.6 MPa, the 300% tensile strength is greater than 12.5 MPa, the AKRON abrasion is ≤0.29 ml, the low temperature resistance is -45°C*3min without cracking, and the ozone resistance is 50pphm×40°C×72h without cracking. It has excellent basic physical properties, high tensile strength, high wear resistance, low temperature resistance, and strong ozone resistance, and is suitable for use as a rubber compound for transmission crawler rubber. In addition, the present invention uses polydimethylsiloxane, sodium tripolyphosphate and α-alumina powder to modify natural rubber and solution-polymerized styrene-butadiene rubber, which has an enhancing effect. No vulcanizing agent is used, which is safer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1: In some embodiments, a rubber material for high-strength and high-wear-resistant transmission tracks includes the following raw materials in parts by weight: 70 parts of natural rubber, 30 parts of solution-polymerized styrene-butadiene rubber (SSBRT2003), 60 parts of carbon black N234, 3.5 parts of calcined α-alumina powder, 3 parts of polydimethylsiloxane, 1 part of aromatic oil, 2 parts of microcrystalline wax, 2 parts of antioxidant RD, 2 parts of antioxidant 7F, 2 parts of resin, 1 part of accelerator CZ, 0.5 parts of accelerator DM-75, and 1.5 parts of sodium tripolyphosphate.

[0024] The method for preparing the high-strength and high-wear-resistant rubber material for transmission crawlers comprises the following steps:

[0025] Step 1: The first stage of plasticization is to plasticize the natural rubber and set it aside for later use;

[0026] Step 2: In the first mixing stage, natural rubber and solution polystyrene butadiene rubber are put into an internal mixer and mixed for 40 seconds. Then, calcined α-alumina powder, polydimethylsiloxane and sodium tripolyphosphate are added and mixed for 40 seconds. The mixing pressure is 10 MPa and the mixing chamber temperature is 35°C.

[0027] Step 3: Second stage mixing: add carbon black N234, aromatic oil, microcrystalline wax, antioxidant RD, antioxidant 7F, resin, accelerator CZ, accelerator DM-75 to the materials mixed in the first stage, and mix them for the second time. The mixing pressure is 10MPa, the mixing chamber temperature is 35℃, and the binder is discharged after mixing for 120 seconds. The discharge temperature is 102℃.

[0028] Example 2: In some embodiments, a rubber material for high-elongation and high-wear-resistant transmission tracks includes the following raw materials in parts by weight: 90 parts of natural rubber, 10 parts of solution-polymerized styrene-butadiene rubber (SSBRC2525), 50 parts of carbon black N234, 5 parts of calcined α-alumina powder, 2 parts of polydimethylsiloxane, 3 parts of aromatic oil, 1 part of microcrystalline wax, 1 part of antioxidant RD, 1 part of antioxidant 7F, 5 parts of resin, 2 parts of accelerator CZ, 0.8 parts of accelerator DM-75, and 1 part of sodium tripolyphosphate.

[0029] The method for preparing the high-strength and high-wear-resistant rubber material for transmission crawlers comprises the following steps:

[0030] Step 1: The first stage of plasticization is to plasticize the natural rubber and set it aside for later use;

[0031] Step 2: In the first mixing stage, natural rubber and solution polystyrene butadiene rubber are put into an internal mixer and mixed for 50 seconds. Then, calcined α-alumina powder, polydimethylsiloxane and sodium tripolyphosphate are added and mixed for 50 seconds. The mixing pressure is 12 MPa and the mixing chamber temperature is 42°C.

[0032] Step 3: Second stage mixing: add carbon black N234, aromatic oil, microcrystalline wax, antioxidant RD, antioxidant 7F, resin, accelerator CZ, accelerator DM-75 to the materials mixed in the first stage, and mix them for the second time. The mixing pressure is 12MPa, the mixing chamber temperature is 42℃, and the binder is discharged after mixing for 140 seconds, and the binder discharge temperature is 105℃.

[0033] Example 3: In some embodiments, a rubber material for high-strength and high-wear-resistant transmission tracks includes the following raw materials in parts by weight: 80 parts of natural rubber, 20 parts of solution-polymerized styrene-butadiene rubber (SSBR1000), 55 parts of carbon black N234, 4 parts of calcined α-alumina powder, 2.6 parts of polydimethylsiloxane, 2.5 parts of aromatic oil, 2 parts of microcrystalline wax, 2 parts of antioxidant RD, 2 parts of antioxidant 7F, 4 parts of resin, 1.4 parts of accelerator CZ, 0.6 parts of accelerator DM-75, and 1.3 parts of sodium tripolyphosphate.

[0034] The method for preparing the high-strength and high-wear-resistant rubber material for transmission crawlers comprises the following steps:

[0035] Step 1: The first stage of plasticization is to plasticize the natural rubber and set it aside for later use;

[0036] Step 2: In the first mixing stage, natural rubber and solution polystyrene butadiene rubber are put into an internal mixer and mixed for 45 seconds. Then, calcined α-alumina powder, polydimethylsiloxane and sodium tripolyphosphate are added and mixed for 45 seconds. The mixing pressure is 11 MPa and the mixing chamber temperature is 38°C.

[0037] Step 3: Second stage mixing: add carbon black N234, aromatic oil, microcrystalline wax, antioxidant RD, antioxidant 7F, resin, accelerator CZ, accelerator DM-75 to the materials mixed in the first stage, and mix them for the second time. The mixing pressure is 11MPa, the mixing chamber temperature is 40℃, and the binder is discharged after mixing for 130 seconds. The discharge temperature is 103℃.

[0038] Comparative Example 1: In some embodiments, the weight ratio of polydimethylsiloxane to sodium tripolyphosphate is 1:1.

[0039] A rubber material for a high-stretch and high-wear-resistant transmission crawler belt comprises the following raw materials in parts by weight: 78.7 parts of natural rubber, 20 parts of solution-polymerized styrene-butadiene rubber (SSBR1000), 55 parts of carbon black N2345, 4 parts of calcined alpha-alumina powder, 2.6 parts of polydimethylsiloxane, 2.5 parts of aromatic oil, 2 parts of microcrystalline wax, 2 parts of antioxidant RD, 2 parts of antioxidant 7F, 4 parts of resin, 1.4 parts of accelerator CZ, 0.6 parts of accelerator DM-75, and 2.6 parts of sodium tripolyphosphate.

[0040] The method for preparing the high-strength and high-wear-resistant rubber material for transmission crawlers comprises the following steps:

[0041] Step 1: The first stage of plasticization is to plasticize the natural rubber and set it aside for later use;

[0042] Step 2: In the first mixing stage, natural rubber and solution polystyrene butadiene rubber are put into an internal mixer and mixed for 45 seconds. Then, calcined α-alumina powder, polydimethylsiloxane and sodium tripolyphosphate are added and mixed for 45 seconds. The mixing pressure is 11 MPa and the mixing chamber temperature is 38°C.

[0043] Step 3: Second stage mixing: add carbon black N234, aromatic oil, microcrystalline wax, antioxidant RD, antioxidant 7F, resin, accelerator CZ, accelerator DM-75 to the materials mixed in the first stage, and mix them for the second time. The mixing pressure is 11MPa, the mixing chamber temperature is 40℃, and the binder is discharged after mixing for 130 seconds. The discharge temperature is 103℃.

[0044] Experimental example

[0045] The rubber materials of Examples 1-3 and Comparative Example 1 were tested for performance, and the results are shown in the table below.

[0046] Table 1 Performance test results

[0047] project Example 1 Example 2 Example 3 Comparative Example 1 Hardness (Shore A) 69.8 70.6 68.7 54 Tensile strength(MPa) 24.55 25.14 24.69 18.7 Elongation at break (%) 680.2 561.2 570.3 360.7 100% tensile strength (MPa) 2.87 2.65 2.76 2.57 300% tensile strength (MPa) 12.81 12.54 12.78 8.84 AKRON wear (ml) 0.24 0.29 0.26 0.39 Low temperature resistance -45℃*10min No cracks No cracks No cracks Cracking Ozone resistance 50pphm×40℃×72h No cracks No cracks No cracks No cracks

[0048] It can be seen that the hardness of the rubber material of the present invention is between 68.7-70.6ShoreA, the tensile strength is greater than 24.5MPa, the elongation at break is greater than 561%, the 100% tensile strength is greater than 2.6MPa, the 300% tensile strength is greater than 12.5MPa, the AKRON abrasion is ≤0.29ml, the low temperature resistance is -45℃*3min without cracking, and the ozone resistance is 50pphm×40℃×72h without cracking. It has excellent basic physical properties, high tensile strength, high wear resistance, low temperature resistance, and strong ozone resistance, and is suitable for use as a rubber compound for transmission track rubber. In addition, the present invention uses polydimethylsiloxane, sodium tripolyphosphate and α-alumina powder to modify natural rubber and solution-polymerized styrene-butadiene rubber, which has an enhancing effect. No vulcanizing agent is used, which is safer.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rubber material for a high-strength and high-wear-resistant transmission crawler, characterized in that: The invention comprises the following raw materials in parts by weight: 70-90 parts of natural rubber, 10-30 parts of solution-polymerized styrene-butadiene rubber, 50-60 parts of carbon black N234, 3.5-5 parts of calcined alpha-alumina powder, 2-3 parts of polydimethylsiloxane, 1-3 parts of aromatic oil, 1-2 parts of microcrystalline wax, 1-2 parts of antioxidant RD, 1-2 parts of antioxidant 7F, 2-5 parts of resin, 1-2 parts of accelerator CZ, 0.5-0.8 parts of accelerator DM-75 and 1-1.5 parts of sodium tripolyphosphate.

2. The high-strength and high-wear-resistant rubber material for transmission crawler belt according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 70 parts of natural rubber, 30 parts of solution-polymerized styrene-butadiene rubber, 60 parts of carbon black N234, 3.5 parts of calcined alpha-alumina powder, 3 parts of polydimethylsiloxane, 1 part of aromatic oil, 2 parts of microcrystalline wax, 2 parts of antioxidant RD, 2 parts of antioxidant 7F, 2 parts of resin, 1 part of accelerator CZ, 0.5 parts of accelerator DM-75 and 1.5 parts of sodium tripolyphosphate.

3. The high-strength and high-wear-resistant rubber material for transmission crawler according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 90 parts of natural rubber, 10 parts of solution-polymerized styrene-butadiene rubber, 450 parts of carbon black N234, 5 parts of calcined alpha-alumina powder, 2 parts of polydimethylsiloxane, 3 parts of aromatic oil, 1 part of microcrystalline wax, 1 part of antioxidant RD, 1 part of antioxidant 7F, 5 parts of resin, 2 parts of accelerator CZ, 0.8 parts of accelerator DM-75 and 1 part of sodium tripolyphosphate.

4. The high-strength and high-wear-resistant rubber material for transmission crawler belt according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 80 parts of natural rubber, 20 parts of solution-polymerized styrene-butadiene rubber, 55 parts of carbon black N234, 4 parts of calcined alpha-alumina powder, 2.6 parts of polydimethylsiloxane, 2.5 parts of aromatic oil, 2 parts of microcrystalline wax, 2 parts of antioxidant RD, 2 parts of antioxidant 7F, 4 parts of resin, 1.4 parts of accelerator CZ, 0.6 parts of accelerator DM-75 and 1.3 parts of sodium tripolyphosphate.

5. The high-strength and high-wear-resistant rubber material for transmission crawler belt according to claim 1, characterized in that: The brand of the solution-polymerized styrene-butadiene rubber is any one of SSBRT2003, SSBRC2525 and SSBR1000.

6. The high-strength and high-wear-resistant rubber material for transmission crawler belt according to claim 1, characterized in that: The weight ratio of polydimethylsiloxane to sodium tripolyphosphate is 2:

1.

7. A method for preparing the high-elongation and high-wear-resistant rubber material for transmission crawlers according to claim 1, characterized in that: The following steps are involved: Step 1: The first stage of plasticization is to plasticize the natural rubber and set it aside for later use; Step 2: In the first mixing stage, natural rubber and solution-polymerized styrene-butadiene rubber are put into an internal mixer and mixed for 40-50 seconds, and then calcined α-alumina powder, polydimethylsiloxane and sodium tripolyphosphate are added and mixed for 40-50 seconds; Step 3: The second stage of mixing, add carbon black N234, aromatic oil, microcrystalline wax, antioxidant RD, antioxidant 7F, resin, accelerator CZ, accelerator DM-75 to the materials mixed in the first stage, and mix for the second time. After mixing for 120-140 seconds, the glue is discharged to obtain the product.

8. The method for preparing the high-elongation and high-wear-resistant rubber material for transmission crawler belt according to claim 7, characterized in that: The mixing pressure is 10-12MPa and the mixing chamber temperature is 35-42°C.

9. The method for preparing a rubber material for a high-fixed elongation and high-wear-resistant transmission crawler according to claim 8, characterized in that: The debinding temperature is 102-105℃.

10. A rubber material for a transmission track with high elongation and high wear resistance prepared by the preparation method according to claim 9, characterized in that: The hardness of the rubber material is 68.7-70.6A, tensile strength>24.5MPa, elongation at break>561%, 100% tensile strength>2.6MPa, 300% tensile strength>12.5MPa, AKRON abrasion ≤0.29ml, low temperature resistance -45℃*3min without cracking, ozone resistance 50pphm×40℃×72h without cracking.