CN113968996B - Wear-resistant hydrophobic low-rolling-resistance conveyor belt cover rubber and preparation method thereof - Google Patents

Abstract

A wear-resistant, hydrophobic and low-rolling-resistance conveyor belt cover glue and a preparation method thereof belong to the technical field of conveyor belts. The raw materials for the preparation of the conveyor belt cover rubber provided by the present invention include natural rubber CV-60, styrene-butadiene rubber 1500, carbon black N110, zinc oxide, stearic acid, accelerator CZ, sulfur, anti-aging agent RD, anti-aging agent 4020, aromatic hydrocarbons Oil V500, oxidized multilayer fullerenes. The conveyor belt cover glue provided by the invention can not only meet the requirements of wear resistance and low rolling resistance but also meet the requirements of hydrophobic performance.

Description

A wear-resistant hydrophobic low rolling resistance conveyor belt cover glue and preparation method thereof

technical field

The invention belongs to the technical field of conveyor belts, in particular to a wear-resistant, hydrophobic and low-resistance conveyor belt cover glue and a preparation method thereof.

Background technique

With the advancement of science and technology, the application fields of rubber products continue to expand. At the same time, energy saving and emission reduction, and improving the service life of rubber products have become urgent problems to be solved. In the field of conveyor belts, it is usually required to have good wear resistance, small friction coefficient and good wet skid resistance. In order to achieve the purpose of improving the wear resistance of rubber products and saving costs, the general-purpose rubber styrene-butadiene rubber, butadiene rubber, and natural rubber are usually used together for conveyor belt products. The simple combination of rubber can no longer meet the needs of energy saving, emission reduction, and prolonging the life of rubber products. Therefore, people began to explore the mechanism of rubber friction and wear, starting with fillers to solve the problem of friction and wear of rubber products, such as wear-resistant fillers, lubricating fillers and nano fillers.

At present, some researchers have studied the influence of graphite, montmorillonite, and aramid fiber on the friction and wear properties of rubber products. As the amount of graphite increases, the time to reach a stable friction coefficient is shortened, and the friction coefficient shows a downward trend. When the amount of graphite increases, part of the graphite is in a free state, and a layer of lubricating transfer film is formed on the contact surface of the two objects to play a self-lubricating effect. ; When montmorillonite is introduced into natural rubber, the distance between the wear marks is reduced, the adhesive friction is reduced, the wear particles become smaller, the steps of the wear pattern become lower, and there are no obvious defects on the surface of the material, and the wear resistance increase, the organic montmorillonite sheet acts as a rigid sheet, which reduces the friction coefficient of the material, and the sheet is dispersed in the rubber in a peeled or intercalated state, participates in vulcanization, increases the crosslinking density, and forms more bonding glue, which limits the With the movement of molecular chains, tanδ decreases; the addition of aramid fiber to rubber products can reduce the friction coefficient of the material, reduce heat generation, and significantly reduce the friction coefficient and wear rate of rubber. The wear-resistant fillers, lubricating fillers and nano-fillers currently used can effectively improve the wear resistance of rubber products, but they cannot make rubber products have lower rolling resistance and hydrophobic properties at the same time, and cannot meet energy saving and emission reduction and improve the use of conveyor belts at the same time. life needs.

Therefore, there is currently a need for a conveyor belt that can not only meet the wear resistance and low rolling resistance but also meet the requirements of hydrophobic performance, so as to prolong the service life of the conveyor belt and meet the needs of energy saving and emission reduction.

Contents of the invention

The purpose of the present invention is to provide a conveyor belt cover rubber that can satisfy both wear resistance and low rolling resistance and hydrophobic performance.

The invention provides a wear-resistant, hydrophobic and low-rolling-resistance conveyor belt cover rubber. The raw materials for preparing the conveyor belt cover rubber include the following components:

Natural rubber CV-60, styrene-butadiene rubber 1500, carbon black N110, zinc oxide, stearic acid, accelerator CZ, sulfur, anti-aging agent RD, anti-aging agent 4020, environmental protection aromatic oil V500, 2-20 layers of oxidation multi-layer rich leene.

Preferably, the raw materials for preparing the conveyor belt cover rubber corresponding to 80 parts of natural rubber CV-60 are as follows:

80 parts of natural rubber CV-60, 20 parts of styrene-butadiene rubber 1500, 55 parts of carbon black N110, 5 parts of zinc oxide, 1.5 parts of stearic acid, 0.5 parts of accelerator CZ, 3 parts of sulfur, 1.5 parts of anti-aging agent RD, 1.5 parts Antiaging agent 4020, 5 parts of environmentally friendly aromatic oil V500, 2-6 parts of 2-20 layers of oxidized multilayer fullerene.

Preferably, the raw materials for preparing the conveyor belt cover rubber corresponding to 80 parts of natural rubber CV-60 are as follows:

80 parts of natural rubber CV-60, 20 parts of styrene-butadiene rubber 1500, 55 parts of carbon black N110, 5 parts of zinc oxide, 1.5 parts of stearic acid, 0.5 parts of accelerator CZ, 3 parts of sulfur, 1.5 parts of anti-aging agent RD, 1.5 parts Antiaging agent 4020, 5 parts of environmentally friendly aromatic oil V500, 2 parts of 10-layer oxide multilayer fullerene.

Preferably, the preparation method of described conveyor belt cover glue comprises the steps:

A. Mixing process

(1) Weigh each preparation raw material according to the number of parts, and set the internal mixer conditions as an initial temperature of 50°C and a rotational speed of 50r/min;

(2) Add 80 parts of natural rubber CV-60 and 20 parts of styrene-butadiene rubber into the internal mixer and mix for 2 minutes;

(3) Add 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of antioxidant RD and 1.5 parts of antioxidant 4020 into the internal mixer and mix for 2 minutes;

(4) Add 22.5 parts of carbon black N110, 1 part of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes;

(5) Add 22.5 parts of carbon black N110, 1 part of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes to obtain masterbatch;

B. Open refining process

(1) Plasticize the masterbatch until the rolls are covered evenly, add 0.5 parts of accelerator CZ, cut the left and right 3/4 5 times after all the rubber is powdered, add 3 parts of sulfur, and cut the left and right 3/4 each Cut 5 times, thin pass 5 times, exhaust the next piece, park at room temperature for 16 hours, and get the mixed rubber disc;

C. Vulcanization process

(1) Put a 5g compound rubber disc in the cavity of a vulcanizer to measure the vulcanization parameters, and determine the process vulcanization time T90;

(2) According to the vulcanization conditions of 150° C., 10 MPa, and T90, vulcanize on a flat vulcanizer, and park at room temperature for 16 hours to obtain the conveyor belt cover rubber.

Secondly, the present invention provides a method for preparing a wear-resistant, hydrophobic and low-rolling-resistance conveyor belt cover rubber, the preparation method comprising the following steps:

A. Mixing process

(1) Weigh each preparation raw material according to the number of parts, and set the internal mixer conditions as an initial temperature of 50°C and a rotational speed of 50r/min;

(2) Add 80 parts of natural rubber CV-60 and 20 parts of styrene-butadiene rubber into the internal mixer and mix for 2 minutes;

(3) Add 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of antioxidant RD and 1.5 parts of antioxidant 4020 into the internal mixer and mix for 2 minutes;

(4) Add 22.5 parts of carbon black N110, 1-3 parts of 2-20 layers of oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt, and mix 2min;

(5) Add 22.5 parts of carbon black N110, 1-3 parts of 2-20 layers of oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic hydrocarbon oil V500 into the internal mixer, stop for 30 seconds, put the top plug, and mix Refining for 2 minutes to obtain the masterbatch;

B. Open refining process

(1) Plasticize the masterbatch until the rolls are covered evenly, add 0.5 parts of accelerator CZ, cut the left and right 3/4 5 times after all the rubber is powdered, add 3 parts of sulfur, and cut the left and right 3/4 each Cut 5 times, thin pass 5 times, exhaust the next piece, park at room temperature for 16 hours, and get the mixed rubber disc;

C. Vulcanization process

(1) Put a 5g compound rubber disc in the cavity of a vulcanizer to measure the vulcanization parameters, and determine the process vulcanization time T90;

(2) According to the vulcanization conditions of 150° C., 10 MPa, and T90, vulcanize on a flat vulcanizer, and park at room temperature for 16 hours to obtain the conveyor belt cover rubber.

The beneficial effects of the present invention are:

The invention provides a conveyor belt cover rubber that can meet the requirements of wear resistance and low rolling resistance as well as hydrophobic performance, has low Akron wear, DIN wear, multi-directional friction wear, and rolling resistance and has excellent Hydrophobic, so as to prolong the service life of the conveyor belt, and at the same time meet the needs of energy saving and emission reduction.

Description of drawings

Figure 1 is the effect of different parts of oxidized multilayer fullerene on the Acron abrasion of vulcanized rubber;

Figure 2 is the effect of different parts of oxidized multilayer fullerene on the DIN abrasion of vulcanized rubber;

Figure 3 shows the multi-directional friction and wear effects of different parts of oxidized multilayer fullerene on vulcanized rubber;

Figure 4 is the effect of different parts of oxidized multilayer fullerene on the loss tangent value of vulcanized rubber;

Fig. 5 Effect of different proportions of oxidized multilayer fullerenes on the hydrophobic properties of vulcanizates.

Detailed ways

In order to clearly illustrate the technical features of the solution, the solution will be described below through specific implementation modes.

Example 1

A. Mixing process

(1) Weigh each preparation raw material according to the number of parts, and set the internal mixer conditions as an initial temperature of 50°C and a rotational speed of 50r/min;

(2) Add 80 parts of natural rubber CV-60 and 20 parts of styrene-butadiene rubber into the internal mixer and mix for 2 minutes;

(3) Add 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of antioxidant RD and 1.5 parts of antioxidant 4020 into the internal mixer and mix for 2 minutes;

(4) Add 22.5 parts of carbon black N110 and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put on the top bolt, and mix for 2 minutes;

(5) Add 22.5 parts of carbon black N110 and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer again, stop for 30 seconds, put on the top bolt, and mix for 2 minutes to obtain the masterbatch;

B. Open refining process

(1) Plasticize the masterbatch until the rolls are covered evenly, add 0.5 parts of accelerator CZ, cut the left and right 3/4 5 times after all the rubber is powdered, add 3 parts of sulfur, and cut the left and right 3/4 each Cut 5 times, thin pass 5 times, exhaust the next piece, park at room temperature for 16 hours, and get the mixed rubber disc;

C. Vulcanization process

(1) Put a 5g compound rubber disc in the cavity of a vulcanizer to measure the vulcanization parameters, and determine the process vulcanization time T90;

(2) According to the vulcanization conditions of 150° C., 10 MPa, and T90, vulcanize on a flat vulcanizer, and park at room temperature for 16 hours to obtain the conveyor belt cover rubber.

Example 2

A. Mixing process

(1) Weigh each preparation raw material according to the number of parts, and set the internal mixer conditions as an initial temperature of 50°C and a rotational speed of 50r/min;

(2) Add 80 parts of natural rubber CV-60 and 20 parts of styrene-butadiene rubber into the internal mixer and mix for 2 minutes;

(3) Add 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of antioxidant RD and 1.5 parts of antioxidant 4020 into the internal mixer and mix for 2 minutes;

(4) Add 22.5 parts of carbon black N110, 1 part of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes;

(5) Add 22.5 parts of carbon black N110, 1 part of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes to obtain masterbatch;

B. Open refining process

(1) Plasticize the masterbatch until the rolls are covered evenly, add 0.5 parts of accelerator CZ, cut the left and right 3/4 5 times after all the rubber is powdered, add 3 parts of sulfur, and cut the left and right 3/4 each Cut 5 times, thin pass 5 times, exhaust the next piece, park at room temperature for 16 hours, and get the mixed rubber disc;

C. Vulcanization process

(1) Put a 5g compound rubber disc in the cavity of a vulcanizer to measure the vulcanization parameters, and determine the process vulcanization time T90;

(2) According to the vulcanization conditions of 150° C., 10 MPa, and T90, vulcanize on a flat vulcanizer, and park at room temperature for 16 hours to obtain the conveyor belt cover rubber.

Example 3

A. Mixing process

(1) Weigh each preparation raw material according to the number of parts, and set the internal mixer conditions as an initial temperature of 50°C and a rotational speed of 50r/min;

(2) Add 80 parts of natural rubber CV-60 and 20 parts of styrene-butadiene rubber into the internal mixer and mix for 2 minutes;

(3) Add 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of antioxidant RD and 1.5 parts of antioxidant 4020 into the internal mixer and mix for 2 minutes;

(4) Add 22.5 parts of carbon black N110, 2 parts of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes;

(5) Add 22.5 parts of carbon black N110, 2 parts of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes to obtain masterbatch;

B. Open refining process

(1) Plasticize the masterbatch until the rolls are covered evenly, add 0.5 parts of accelerator CZ, cut the left and right 3/4 5 times after all the rubber is powdered, add 3 parts of sulfur, and cut the left and right 3/4 each Cut 5 times, thin pass 5 times, exhaust the next piece, park at room temperature for 16 hours, and get the mixed rubber disc;

C. Vulcanization process

(1) Put a 5g compound rubber disc in the cavity of a vulcanizer to measure the vulcanization parameters, and determine the process vulcanization time T90;

(2) According to the vulcanization conditions of 150° C., 10 MPa, and T90, vulcanize on a flat vulcanizer, and park at room temperature for 16 hours to obtain the conveyor belt cover rubber.

Example 4

A. Mixing process

(1) Weigh each preparation raw material according to the number of parts, and set the internal mixer conditions as an initial temperature of 50°C and a rotational speed of 50r/min;

(2) Add 80 parts of natural rubber CV-60 and 20 parts of styrene-butadiene rubber into the internal mixer and mix for 2 minutes;

(3) Add 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of antioxidant RD and 1.5 parts of antioxidant 4020 into the internal mixer and mix for 2 minutes;

(4) Add 22.5 parts of carbon black N110, 3 parts of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes;

(5) Add 22.5 parts of carbon black N110, 3 parts of 10-layer oxidized multilayer fullerene and 2.5 parts of environmentally friendly aromatic oil V500 into the internal mixer, stop for 30 seconds, put the top bolt on, and mix for 2 minutes to obtain masterbatch;

B. Open refining process

(1) Plasticize the masterbatch until the rolls are covered evenly, add 0.5 parts of accelerator CZ, cut the left and right 3/4 5 times after all the rubber is powdered, add 3 parts of sulfur, and cut the left and right 3/4 each Cut 5 times, thin pass 5 times, exhaust the next piece, park at room temperature for 16 hours, and get the mixed rubber disc;

C. Vulcanization process

(1) Put a 5g compound rubber disc in the cavity of a vulcanizer to measure the vulcanization parameters, and determine the process vulcanization time T90;

(2) According to the vulcanization conditions of 150° C., 10 MPa, and T90, vulcanize on a flat vulcanizer, and park at room temperature for 16 hours to obtain the conveyor belt cover rubber.

Experimental results

The effects of different parts of oxidized multilayer fullerene on Acron abrasion, DIN abrasion, multi-directional friction and wear, loss tangent and hydrophobic properties of vulcanized rubber were tested.

Figure 1 shows the effect of different parts of oxidized multilayer fullerene on the Acron abrasion of vulcanized rubber. It can be seen from the figure that with the increase of the amount of oxidized multilayer fullerene, the Acron wear of the vulcanized rubber decreases first and then increases. When 2 parts of oxidized multilayer fullerene are introduced into the rubber matrix, the The wear volume is reduced by 14.7%. When the amount of oxidized multilayer fullerene is more than 2 parts, the wear volume of the vulcanized rubber will not decrease but increase. This is because the oxidized multilayer fullerene is easy to agglomerate , the greater the amount, the more uneven the dispersion, resulting in an increase in the wear volume when the amount is greater than 2 parts.

Figure 2 shows the effect of different parts of oxidized multilayer fullerene on the DIN abrasion of vulcanizate. It can be seen from the figure that with the increase of the amount of oxidized multilayer fullerene, the DIN wear volume of the vulcanizate first decreases and then increases. This trend is the same as that of Akron wear. The wear volume of multi-layer fullerene is reduced by 7.9%. When the amount of oxidized multi-layer fullerene is more than 2 parts, it will not reduce the wear volume of vulcanized rubber but increase it. This is due to the oxidation of multi-layer fullerene. Fullerenes are easy to agglomerate, and the greater the amount, the more uneven the dispersion, resulting in increased wear volume when the amount is greater than 2 parts.

Figure 3 shows the multi-directional friction and wear effects of different parts of oxidized multilayer fullerene on vulcanized rubber. It can be seen from the figure that with the increase of the amount of oxidized multilayer fullerene, the multi-directional friction and wear volume of the vulcanizate first decreases and then increases. This trend is the same as that of Akron wear and DIN wear. When 2 parts of oxidized multilayered fullerenes were introduced, the wear volume decreased by 7.5%. When the amount of oxidized multilayered fullerenes was greater than 2 parts, the wear volume of the vulcanized rubber would not decrease but increased. It is because the oxidized multi-layer fullerene is easy to agglomerate, and the larger the amount is, the more uneven the dispersion will be, resulting in an increase in the wear volume when the amount is greater than 2 parts.

Figure 4 shows the effect of different fractions of oxidized multilayer fullerene on the loss tangent. It can be seen from the figure that when 2 parts of oxidized multilayer fullerenes are introduced, the loss tangent value of the vulcanized rubber is always at the minimum between -30°C and 100°C, and the loss tangent value in tires is usually around 60°C The smaller the tire, the lower the low rolling resistance. Since the use conditions of the conveyor belt are different from those of the tire, under the use temperature of the conveyor belt, the introduction of 2 parts of oxidized multilayer fullerene can reduce its loss tangent value. Reduce the rolling resistance of vulcanized rubber.

Figure 5 shows the effect of different proportions of oxidized multilayer fullerene on the contact angle of vulcanizate. The wettability of composite materials is good or bad, and the size of the contact angle is one of the commonly used characterization methods. At the junction of gas, liquid and solid, the angle between the gas-liquid and liquid-solid interfacial tension is called the contact angle, usually expressed by θ, θ>90° is not wet, and θ<90° can be wetted , the larger the contact angle, the better the hydrophobic performance of the liquid on the solid. It can be seen from the figure that with the increase of the amount of oxidized multilayer fullerene, the contact angle of the vulcanizate tends to increase, which indicates that the hydrophobicity of the vulcanizate increases with the increase of the amount of oxidized multilayer fullerene.

Based on the above results, it can be seen that when 2 parts of oxidized multilayer fullerene is added, the obtained conveyor belt cover rubber has good abrasive performance, hydrophobic performance and low rolling resistance.

The undescribed technical features of the present invention can be realized by or using the prior art, and will not be repeated here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Those of ordinary skill in the art Changes, modifications, additions or substitutions made within the essential scope of the present invention shall also belong to the protection scope of the present invention.

Claims (2)

1. The wear-resistant hydrophobic low-rolling-resistance conveyer belt cover rubber is characterized in that the conveyer belt cover rubber corresponding to each 80 parts of natural rubber CV-60 is prepared from the following raw materials:

80 parts of natural rubber CV-60, 20 parts of styrene-butadiene rubber 1500, 55 parts of carbon black N110,5 parts of zinc oxide, 1.5 parts of stearic acid, 0.5 part of accelerator CZ,3 parts of sulfur, 1.5 parts of antioxidant RD,1.5 parts of antioxidant 4020,5 parts of environment-friendly aromatic hydrocarbon oil V500 and 2 parts of 10-layer oxidized multi-layer fullerene.

2. The conveyor belt cover adhesive according to claim 1, wherein the method for preparing the conveyor belt cover adhesive comprises the steps of:

A. banburying process

(1) Weighing all the preparation raw materials according to parts, and setting the conditions of an internal mixer as the initial temperature of 50 ℃ and the rotating speed of 50r/min;

(2) Adding 80 parts of natural rubber CV-60 and 20 parts of styrene-butadiene rubber into an internal mixer for mixing for 2min;

(3) 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of an anti-aging agent RD and 1.5 parts of an anti-aging agent 4020 are added into an internal mixer to be mixed for 2 minutes;

(4) Adding 22.5 parts of carbon black N110,1 part of 10-layer oxidized multi-layer fullerene and 2.5 parts of environment-friendly aromatic hydrocarbon oil V500 into an internal mixer, stopping for 30 seconds, putting a top plug, and mixing for 2 minutes;

(5) Adding 22.5 parts of carbon black N110,1 part of 10-layer oxidized multi-layer fullerene and 2.5 parts of environment-friendly aromatic hydrocarbon oil V500 into an internal mixer, stopping for 30 seconds, putting a top plug, and mixing for 2 minutes to obtain master batch;

B. open mill process

(1) Plasticating the masterbatch until a wrapping roller is uniform, adding 0.5 part of promoter CZ, cutting for 5 times respectively at left and right 3/4 after the sizing material is totally eaten with powder, cutting for 5 times respectively at left and right 3/4 after adding 3 parts of sulfur, discharging air for discharging after passing for 5 times, and standing for 16 hours at room temperature to obtain a rubber compound wafer;

C. vulcanization process

(1) 5g of the rubber compound wafer is placed in a mold cavity of a vulcanizing instrument for vulcanization parameter measurement, and the process vulcanization time T90 is determined;

(2) Vulcanizing on a flat vulcanizing machine according to the vulcanizing condition of 150 ℃,10MPa and T90, and standing for 16 hours at room temperature to obtain the conveyor belt cover rubber.

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