Cold-resistant and cutting-resistant conveyor belt cover rubber and preparation method thereof

Abstract

The invention provides cold-resistant and cutting-resistant conveyor belt cover rubber, and relates to the technical field of rubber conveyor belts for industrial conveying, and the cold-resistant and cutting-resistant conveyor belt cover rubber comprises the following components by weight: 100 parts of raw rubber, 45-60 parts of a reinforcing agent, 5-15 parts of a cold-resistant plasticizer, 4-6 parts of a cold-resistant agent, 10-15 parts of a cutting-resistant agent, 3-7 parts of an activator, 4-8 parts of an anti-aging agent, 3-6 parts of a silane coupling agent, 1-2.5 parts of a vulcanizing agent, and 1-3 parts of an accelerator. The dioctyl adipate and the propylene glycol methyl ether acetate are adopted, so that the force between molecular chains is reduced, the low-temperature flexibility is improved, the elasticity is good in severe cold, and the hardness increase is small; a raw rubber system composed of styrene-butadiene rubber and butadiene rubber further enhances cold resistance, reduces the risk of low-temperature embrittlement, and ensures stable operation of the conveyor belt in cold regions; the mixture of the silicon carbide whiskers and the chopped aramid fibers serves as the anti-cutting agent, and the high-strength whiskers and the tensile aramid fibers form a strong network, so that external force is effectively dispersed, and the service life of the conveying belt is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of rubber conveyor belts for industrial transportation, in particular to a cold-resistant and cut-resistant conveyor belt covering rubber and a preparation method thereof. Background Art

[0002] In Northeast my country, the winter temperature can reach minus 40 degrees Celsius or even lower. Under this condition, the low temperature will restrict the movement of the rubber molecular chains of the conveyor belt covering rubber, causing the rubber to become hard and brittle, and its flexibility will be greatly reduced. It is not only prone to cracks, but also has significantly reduced cut resistance when impacted by materials. Ordinary covering rubbers are difficult to meet the use requirements under such harsh conditions. Once the covering rubber is damaged, the overall performance of the conveyor belt will be seriously affected, and even cause production accidents such as material leakage and transportation interruption, increasing the company's operating costs and maintenance difficulty. Therefore, the development of a cold-resistant and cut-resistant conveyor belt covering rubber has become an urgent problem to be solved in the industry. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a cold-resistant and cut-resistant conveyor belt covering rubber and a preparation method thereof. The conveyor belt covering rubber has good elasticity and tear elongation at low temperatures, excellent cut resistance and good wear resistance, and is suitable for conveyor belts used in cold areas.

[0004] The technical solution adopted by the present invention is:

[0005] A cold-resistant and cut-resistant conveyor belt covering rubber, which comprises the following components by weight: 100 parts of raw rubber, 45-60 parts of reinforcing agent, 5-15 parts of cold-resistant plasticizer, 4-6 parts of cold-resistant agent, 10-15 parts of cut-resistant agent, 3-8 parts of activator, 4-8 parts of antioxidant, 3-6 parts of silane coupling agent, 1-2.5 parts of vulcanizing agent and 1-3 parts of accelerator.

[0006] Preferably, the cold-resistant and cut-resistant conveyor belt covering rubber comprises: the raw rubber comprises 45-90 parts of styrene-butadiene rubber and 10-55 parts of butadiene rubber.

[0007] Preferably, in the cold-resistant and cut-resistant conveyor belt covering rubber, the reinforcing agent is selected from one or two of white carbon black, N134 carbon black and N115 carbon black, and the cold-resistant plasticizer is dioctyl adipate.

[0008] Preferably, in the cold-resistant and cut-resistant conveyor belt covering rubber, the cold-resistant agent is propylene glycol methyl ether acetate, the cut-resistant agent includes silicon carbide whiskers and chopped aramid fibers, and the mass ratio of the silicon carbide whiskers to the chopped aramid fibers is 1:1.

[0009] Preferably, in the cold-resistant and cut-resistant conveyor belt covering rubber, the activator comprises 2-5 parts of nano zinc oxide and 1-3 parts of stearic acid.

[0010] Preferably, in the cold-resistant and cut-resistant conveyor belt covering rubber, the antioxidant is selected from one or more of antioxidant RD, antioxidant 6PPD and microcrystalline wax; and the silane coupling agent is Si69.

[0011] Preferably, in the cold-resistant and cut-resistant conveyor belt covering rubber, the vulcanizing agent is sulfur; and the accelerator is selected from one or more of accelerator CZ, accelerator NS and accelerator DTDM.

[0012] The present invention also provides a method for preparing a cold-resistant and cut-resistant conveyor belt covering rubber, which comprises the following steps in parts by weight:

[0013] Step S1. 100 parts of raw rubber, 45-60 parts of reinforcing agent, 5-15 parts of cold-resistant plasticizer, 4-6 parts of cold-resistant agent, 10-15 parts of anti-cutting agent, 3-7 parts of activator, 4-8 parts of antioxidant, 3-6 parts of silane coupling agent are added to a mixer for primary mixing, and then parked after cooling, and then 1-2.5 parts of vulcanizing agent and 1-3 parts of accelerator are added for secondary mixing, and finally the mixture is re-mixed in an open mill to obtain a mixed rubber;

[0014] Step S2: After the mixed rubber obtained in step S1 is left to stand for 16 hours to 24 hours, it is vulcanized to obtain a cold-resistant and cut-resistant conveyor belt covering rubber.

[0015] Preferably, the method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber is as follows: in step S1, the temperature of the first mixing is 130°C to 145°C, and the time is 4min-8min; the mixing is parked after the cooling temperature is less than 50°C, and the parking time is greater than 8h; the temperature of the second mixing is 90°C to 105°C, and the time is 3min-4min; and the time of the open mixing mill is 4min-6min.

[0016] Preferably, in the method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber, the vulcanization temperature in step S2 is 150° C., the vulcanization pressure is 3 MPa, and the vulcanization time is 30 min.

[0017] Advantages of the present invention:

[0018] The cold-resistant and cut-resistant conveyor belt covering rubber and the preparation method thereof of the present invention adopt dioctyl adipate and propylene glycol methyl ether acetate to reduce the force between molecular chains, improve the low-temperature flexibility, and have good elasticity and a small hardness increase in severe cold; the raw rubber system composed of styrene-butadiene rubber and butadiene rubber further enhances the cold resistance, reduces the risk of low-temperature brittle cracking, and ensures the stable operation of the conveyor belt in cold areas; a mixture of silicon carbide whiskers and chopped aramid fibers is used as an anti-cutting agent, and the high-strength whiskers and tensile-resistant aramid fibers form a strong network, and the cutting resistance is several times that of traditional products, which effectively disperses external forces, prolongs the life of the conveyor belt, reduces interruption and maintenance costs, and cooperates with reinforcement and silane coupling agents to enhance bonding strength and maintain high-efficiency cut resistance. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0020] Example 1

[0021] A cold-resistant and cut-resistant conveyor belt covering rubber comprises the following components, measured by weight: 75 parts of styrene-butadiene rubber, 25 parts of butadiene rubber, 30 parts of white carbon black, 15 parts of N134 carbon black, 5 parts of dioctyl adipate, 4 parts of propylene glycol methyl ether acetate, 5 parts of silicon carbide whiskers, 5 parts of chopped aramid fibers, 3 parts of nano zinc oxide, 2 parts of stearic acid, 1 part of antioxidant RD, 2 parts of antioxidant 6PPD, 1 part of antioxidant microcrystalline wax, 4 parts of Si69, 1 part of sulfur, 1 part of accelerator CZ, 1 part of accelerator NS, and the length of the chopped aramid fibers is 3 mm.

[0022] The method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber of this embodiment comprises the following steps:

[0023] Step S1. 75 parts of styrene-butadiene rubber, 25 parts of butadiene rubber, 30 parts of white carbon black, 15 parts of N134 carbon black, 5 parts of dioctyl adipate, 4 parts of propylene glycol methyl ether acetate, 5 parts of silicon carbide whiskers, 5 parts of chopped aramid fibers, 3 parts of nano zinc oxide, 2 parts of stearic acid, 1 part of antioxidant RD, 2 parts of antioxidant 6PPD, 1 part of antioxidant microcrystalline wax and 4 parts of Si69 are added to a mixer for primary mixing, the primary mixing temperature is 130°C, the time is 4 minutes, cooled to 40°C and parked for 10 hours, then 1 part of sulfur, 1 part of accelerator CZ, and 1 part of accelerator NS are added for secondary mixing, the secondary mixing temperature is 90°C, the time is 3 minutes, and finally the mixture is turned over in an open mill for 4 minutes to obtain a mixed rubber;

[0024] Step S2. After the mixed rubber obtained in step S1 is left to stand for 16 hours, it is vulcanized at a vulcanization temperature of 150° C., a vulcanization pressure of 3 MPa, and a vulcanization time of 30 minutes to obtain a cold-resistant and cut-resistant conveyor belt covering rubber.

[0025] Example 2

[0026] A cold-resistant and cut-resistant conveyor belt covering rubber comprises the following components, measured by weight: 85 parts of styrene-butadiene rubber, 15 parts of butadiene rubber, 35 parts of white carbon black, 20 parts of N134 carbon black, 10 parts of dioctyl adipate, 5 parts of propylene glycol methyl ether acetate, 6 parts of silicon carbide whiskers, 6 parts of chopped aramid fibers, 4 parts of nano zinc oxide, 3 parts of stearic acid, 3 parts of antioxidant microcrystalline wax, 3 parts of antioxidant 6PPD, 5 parts of Si69, 1.5 parts of sulfur, 1.5 parts of accelerator NS, and 1.5 parts of accelerator DTDM.

[0027] The method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber of this embodiment comprises the following steps:

[0028] Step S1. 85 parts of styrene-butadiene rubber, 15 parts of butadiene rubber, 35 parts of white carbon black, 20 parts of N134 carbon black, 10 parts of dioctyl adipate, 5 parts of propylene glycol methyl ether acetate, 6 parts of silicon carbide whiskers, 6 parts of chopped aramid fibers, 4 parts of nano zinc oxide, 3 parts of stearic acid, 3 parts of antioxidant microcrystalline wax, 3 parts of antioxidant 6PPD and 5 parts of Si69 are added to a mixer for primary mixing, the primary mixing temperature is 140°C, the time is 6 minutes, cooled to 35°C and parked for 12 hours, then 1.5 parts of sulfur, 1.5 parts of accelerator NS, and 1.5 parts of accelerator DTDM are added for secondary mixing, the secondary mixing temperature is 100°C, the time is 3.5 minutes, and finally the mixture is turned over in an open mill for 5 minutes to obtain a mixed rubber;

[0029] Step S2. After the mixed rubber obtained in step S1 is left to stand for 20 hours, it is vulcanized at a vulcanization temperature of 150° C., a vulcanization pressure of 3 MPa, and a vulcanization time of 30 minutes to obtain a cold-resistant and cut-resistant conveyor belt covering rubber.

[0030] Example 3

[0031] A cold-resistant and cut-resistant conveyor belt covering rubber comprises the following components, measured by weight: 90 parts of styrene-butadiene rubber, 10 parts of butadiene rubber, 40 parts of N134 carbon black, 20 parts of N115 carbon black, 15 parts of dioctyl adipate, 6 parts of propylene glycol methyl ether acetate, 7.5 parts of silicon carbide whiskers, 7.5 parts of chopped aramid fibers, 5 parts of nano zinc oxide, 2 parts of stearic acid, 3 parts of antioxidant RD, 3 parts of antioxidant microcrystalline wax, 6 parts of Si69, 2 parts of sulfur, 0.5 parts of accelerator CZ and 1 part of accelerator DTDM.

[0032] The method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber of this embodiment comprises the following steps:

[0033] Step S1. 90 parts of styrene-butadiene rubber, 10 parts of butadiene rubber, 40 parts of N134 carbon black, 20 parts of N115 carbon black, 15 parts of dioctyl adipate, 6 parts of propylene glycol methyl ether acetate, 7.5 parts of silicon carbide whiskers, 7.5 parts of chopped aramid fibers, 5 parts of nano zinc oxide, 2 parts of stearic acid, 3 parts of antioxidant RD, 3 parts of antioxidant microcrystalline wax and 6 parts of Si69 are added to a mixer for primary mixing, the primary mixing temperature is 145°C, the time is 8 minutes, cooled to 45°C and parked for 15 hours, then 2 parts of sulfur, 0.5 parts of accelerator CZ, and 1 part of accelerator DTDM are added for secondary mixing, the secondary mixing temperature is 105°C, the time is 4 minutes, and finally the mixture is turned over in an open mill for 6 minutes to obtain a rubber mixture;

[0034] Step S2. After the mixed rubber obtained in step S1 is left to stand for 24 hours, it is vulcanized at a vulcanization temperature of 150° C., a vulcanization pressure of 3 MPa, and a vulcanization time of 30 minutes to obtain a cold-resistant and cut-resistant conveyor belt covering rubber.

[0035] Comparative Example 1 is a common covering rubber. The cold-resistant and cut-resistant conveyor belt covering rubbers of Examples 1 to 3 and the common covering rubber of Comparative Example 1 were subjected to performance tests. The test results are shown in Table 1.

[0036] Table 1

[0037]

[0038] It can be concluded from the test results in Table 1 that the cold-resistant and anti-cutting conveyor belt covering rubber and the preparation method thereof of the present invention have remarkable effects. At a low temperature of -40°C, compared with the comparative example 1, the elongation decrease of Examples 1-3 is small and the hardness increase is small, indicating that the cold-resistant system has excellent effect. In terms of anti-cutting amount, the examples are much better than the comparative example 1 at both room temperature and low temperature, and the anti-cutting performance is outstanding, which can extend the life of the conveyor belt and reduce the cost. It can be seen that the present invention effectively solves the problem of conveyor belt covering rubber in cold areas and has broad application prospects.

[0039] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A cold-resistant and cut-resistant conveyor belt covering rubber, characterized in that: The composition includes the following components by weight: 100 parts of raw rubber, 45-60 parts of reinforcing agent, 5-15 parts of cold-resistant plasticizer, 4-6 parts of cold-resistant agent, 10-15 parts of anti-cutting agent, 3-8 parts of activator, 4-8 parts of antioxidant, 3-6 parts of silane coupling agent, 1-2.5 parts of vulcanizing agent and 1-3 parts of accelerator.

2. The cold-resistant and cut-resistant conveyor belt covering rubber according to claim 1, characterized in that: The raw rubber comprises 45-90 parts of styrene-butadiene rubber and 10-55 parts of cis-1,4-dibutyl rubber.

3. The cold-resistant and cut-resistant conveyor belt covering rubber according to claim 1, characterized in that: The reinforcing agent is selected from one or two of white carbon black, N134 carbon black and N115 carbon black, and the cold-resistant plasticizer is dioctyl adipate.

4. The cold-resistant and cut-resistant conveyor belt covering rubber according to claim 1, characterized in that: The anti-cold agent is propylene glycol methyl ether acetate, and the anti-cutting agent includes silicon carbide whiskers and chopped aramid fibers, and the mass ratio of the silicon carbide whiskers to the chopped aramid fibers is 1:

1.

5. The cold-resistant and cut-resistant conveyor belt covering rubber according to claim 1, characterized in that: The activator comprises 2-5 parts of nano zinc oxide and 1-3 parts of stearic acid.

6. The cold-resistant and cut-resistant conveyor belt covering rubber according to claim 1, characterized in that: The antioxidant is selected from one or more of antioxidant RD, antioxidant 6PPD and microcrystalline wax; and the silane coupling agent is Si69.

7. The cold-resistant and cut-resistant conveyor belt covering rubber according to claim 1, characterized in that: The vulcanizing agent is sulfur; the accelerator is selected from one or more of accelerator CZ, accelerator NS and accelerator DTDM.

8. The method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber according to any one of claims 1 to 7, characterized in that: By weight, the method comprises the following steps: Step S1. 100 parts of raw rubber, 45-60 parts of reinforcing agent, 5-15 parts of cold-resistant plasticizer, 4-6 parts of cold-resistant agent, 10-15 parts of anti-cutting agent, 3-7 parts of activator, 4-8 parts of antioxidant, 3-6 parts of silane coupling agent are added to a mixer for primary mixing, and then parked after cooling, and then 1-2.5 parts of vulcanizing agent and 1-3 parts of accelerator are added for secondary mixing, and finally the mixture is re-mixed in an open mill to obtain a mixed rubber; Step S2: After the mixed rubber obtained in step S1 is left to stand for 16 hours to 24 hours, it is vulcanized to obtain a cold-resistant and cut-resistant conveyor belt covering rubber.

9. The method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber according to claim 8, characterized in that: In step S1, the temperature of the first mixing is 130°C to 145°C, and the time is 4min-8min; the mixture is parked after cooling to a temperature less than 50°C, and the parking time is greater than 8h; the temperature of the second mixing is 90°C to 105°C, and the time is 3min-4min; and the time of the open mixing mill is 4min-6min.

10. The method for preparing the cold-resistant and cut-resistant conveyor belt covering rubber according to claim 8, characterized in that: In step S2, the vulcanization temperature is 150° C., the vulcanization pressure is 3 MPa, and the vulcanization time is 30 min.

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