High temperature resistant aramid fabric core conveyor belt

Abstract

The application discloses a high-temperature-resistant aramid fabric core conveying belt, which comprises an aramid fabric core layer, and upper and lower covering rubber layers arranged on the two sides of the aramid fabric core layer respectively; the aramid fabric core layer is composed of one layer of aramid canvas and a rubber dipping layer coated on the outer surface of the canvas; the raw material components of the covering rubber layer include, by weight, 50-60 parts of ethylene-propylene-diene rubber, 30-40 parts of natural rubber, 5-15 parts of styrene-butadiene rubber, 5-7 parts of nano zinc oxide, 1-2 parts of stearic acid, 2-4 parts of light magnesium oxide, 1-2 parts of anti-aging agent, 1-2 parts of heat-resistant agent, 1-2 parts of adhesion anti-aging agent, 2-4 parts of tackifier, 4-8 parts of adhesive, 0.5-1 part of accelerator, 3-5 parts of magnesium methacrylate, 3-5 parts of phenolic resin, 4-6 parts of silicon dioxide, 20-35 parts of carbon black, 10-12 parts of white carbon black, 5-8 parts of paraffin oil, 5-8 parts of softening heavy oil, 1-2 parts of sulfur, 0.4-0.6 parts of cross-linking agent and 2-5 parts of vulcanizing agent; under the specific raw material formula, the high-temperature-resistant performance of the conveying belt is remarkably improved, the service life of the conveying belt is prolonged, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber conveyor belt manufacturing, in particular to a high-temperature-resistant aramid fabric core conveyor belt. BACKGROUND

[0002] The conveyor belt is an important component of the conveyor, which is installed on the conveyor to carry and convey materials, and is widely used in the fields of material conveying such as mining, metallurgy, steel, coal, hydropower, building materials, and chemical industry. The conveyor belt is mainly composed of a skeleton layer and a covering layer on both sides of the skeleton layer. The performance and purpose of the conveyor belt are different due to different raw material components of rubber. The existing conveyor belt is easily damaged when conveying high-temperature materials due to the material and formula, which reduces the service life of the conveyor belt.

[0003] In addition, the skeleton material of the existing high-temperature-resistant conveyor belt is mainly heat-resistant polyester fiber canvas, aramid fabric, or steel wire rope. The heat-resistant polyester fiber canvas has low temperature resistance and is easily burned through in an environment above 200℃, resulting in a short service life of the conveyor belt. Although the steel wire rope skeleton has high temperature resistance, it has a heavy weight, resulting in high energy consumption of the conveyor belt operation. Moreover, the adhesion between the metal and the rubber layer will decrease with the high-temperature aging of the rubber material, and the service life is also short. The aramid fabric has good high-temperature resistance, but in order to achieve the strength of the conveyor belt, the weaving density of the aramid fabric is high, resulting in poor permeability and adhesion during impregnation. When the working temperature is too high, the aramid fabric and the rubber are prone to separation. SUMMARY

[0004] In order to overcome the deficiencies in the prior art, the present application provides a high-temperature-resistant aramid fabric core conveyor belt. The conveyor belt uses an aramid fabric core as an intermediate skeleton, has good high-temperature resistance under a specific formula, has high strength and good adhesion, saves cost, reduces energy consumption, and increases service life while ensuring high-temperature resistance.

[0005] For the rubber conveyor belt, the present application provides the following technical solutions:

[0006] The high-temperature-resistant aramid fabric core conveyor belt comprises an aramid fabric core layer, and upper and lower covering rubber layers respectively arranged on both sides of the aramid fabric core layer; the aramid fabric core layer is composed of one layer of aramid canvas and a rubber impregnation layer coated on the outer surface of the canvas.

[0007] The upper covering rubber layer comprises the following raw material components by weight:

[0008]

[0009] The lower covering rubber layer comprises the following raw material components by weight:

[0010]

[0011] As preferred, the upper cover rubber layer raw material components include, by weight parts:

[0012]

[0013]

[0014] As preferred, the lower cover rubber layer raw material components include, by weight parts:

[0015]

[0016] As preferred, the phenolic resin is ethylene-propylene rubber special tackifying resin CH-ED.

[0017] As preferred, the white carbon black is a precipitated white carbon black.

[0018] As preferred, the impregnated rubber layer is formed by a mixed latex prepared by mixing butadiene styrene rubber latex and liquid phenolic resin in a ratio of 2:1-1.2. The phenolic resin has good high temperature resistance, and the butadiene styrene rubber latex and the phenolic resin can improve the flowability of the rubber compound, better penetrate into the aramid fabric, improve the high temperature resistance of the aramid fabric core, and prolong the service life of the conveyor belt.

[0019] As preferred, the upper cover rubber layer and the lower cover rubber layer adopt a two-stage mixing method.

[0020] As preferred, the upper cover rubber layer, the lower cover rubber layer and the aramid fabric core layer are bonded by vulcanization.

[0021] Compared with the prior art, the present application has the following beneficial technical effects:

[0022] The cover rubber layer of the present application adopts ethylene propylene rubber, natural rubber and butadiene styrene rubber as raw materials, adds magnesium methacrylate and phenolic resin, and further adds nano zinc oxide, light magnesium oxide, antioxidant, accelerator, carbon black and adhesive and other specific auxiliaries. The specific material formula and ratio significantly enhance the high temperature resistance of the cover rubber layer, and also improve the adhesion performance, which can better bond with the aramid fabric core layer, prevent separation and cracking; the upper cover rubber layer further adds silica and precipitated white carbon black under the same raw materials, which further improves the wear resistance and bonding strength; the conveyor belt of the present application adopts aramid fabric core as the framework, which is directly bonded with the cover rubber layer, reduces the preparation process of the bonding layer, saves the cost, and has good adhesion performance and significant high temperature resistance, which can be used for a long time without cracking and deformation in high temperature environment, and increases the service life of the conveyor belt. DETAILED DESCRIPTION

[0023] The technical solutions of the present application are further specifically described below through specific examples. In the present application, if not specified, the raw materials and equipment used can be purchased from the market or commonly used in the art. The methods and equipment in the following examples are all conventional methods and equipment in the art, unless otherwise specified.

[0024] The high-temperature-resistant aramid fabric core conveyor belt is tested according to GB / T20021-2017 'Canvas Core Heat-Resistant Conveyor Belt' (T4 level). The high-temperature resistance of the rubber mixture is obtained by testing the hardness change and elongation at break before and after aging. The greater the difference in hardness before and after aging of the rubber mixture, the greater the change in elongation at break, and the poorer the heat resistance.

[0025] Example 1

[0026] In this embodiment, the high-temperature-resistant aramid fabric core conveyor belt comprises an aramid fabric core layer, and an upper cover rubber layer and a lower cover rubber layer respectively arranged on both sides of the aramid fabric core layer; the aramid fabric core layer is composed of one layer of aramid canvas and a dipping layer coated on the outer surface of the canvas;

[0027] The upper cover rubber layer raw material components include, by weight:

[0028]

[0029] The lower cover rubber layer raw material components include, by weight:

[0030]

[0031]

[0032] The dipping layer is formed by a mixed latex prepared by mixing butadiene-styrene rubber latex and liquid phenolic resin at a ratio of 2:1; the phenolic resin is an ethylene-propylene rubber special tackifying resin CH-ED; and the white carbon black is a precipitated white carbon black.

[0033] The adhesive strength and high-temperature resistance of the conveyor belt cover rubber obtained in Example 1 are tested, as shown in Table 1.

[0034] Table 1

[0035]

[0036] Example 2

[0037] Different from Example 1, in this embodiment, the upper cover rubber layer raw material components include, by weight:

[0038]

[0039] The lower cover rubber layer raw material components include, by weight:

[0040]

[0041]

[0042] The impregnation layer is formed by a mixed latex prepared by mixing butadiene styrene rubber latex and liquid phenolic resin in a ratio of 2:1.2; the phenolic resin is ethylene-propylene rubber special tackifying resin CH-ED; and the white carbon black is precipitated white carbon black.

[0043] The cover layer of the conveyor belt obtained in the above example 2 is subjected to adhesion strength and high temperature resistance performance test, as shown in table 2.

[0044] Table 2

[0045]

[0046] Example 3

[0047] Different from example 1, in the present example, the raw material components of the upper cover rubber layer include, by weight fraction:

[0048]

[0049] The raw material components of the lower cover rubber layer include, by weight fraction:

[0050]

[0051]

[0052] The cover layer of the conveyor belt obtained in the above example 3 is subjected to adhesion strength and high temperature resistance performance test, as shown in table 3.

[0053] Table 3

[0054]

[0055] The preparation method steps of the upper cover rubber layer of the present application include:

[0056] S1, put the ternary ethylene-propylene rubber, natural rubber and butadiene styrene rubber into the plasticizing mill for plasticizing 250-300 seconds, discharge the glue, pass through the open mill for 3-4 times, and cool the sheet for more than 8 hours to obtain plasticizing glue A;

[0057] S2, put the plasticizing glue A, nano zinc oxide, stearic acid, light magnesium oxide, antioxidant MB, heat resistance agent RD and accelerator CBS into the plasticizing mill, pressurize and mix for 100-120 seconds, then add silica, white carbon black, carbon black, paraffin oil and softening heavy oil, mix for 120-150 seconds, discharge the glue and sheet, the discharge temperature is not more than 140 DEG C, and cool to obtain the first stage mixing rubber B;

[0058] S3, put the first mixing rubber B, adhesion antioxidant BLE, tackifier BN-1, adhesive RC, magnesium methacrylate, phenolic resin into the internal mixer, pressurized mixing for 150-200 seconds, mixing to the temperature of 105 DEG C, then discharging out of the sheet cooling, to obtain the second mixing rubber C;

[0059] S4, put the second mixing rubber C, sulfur, crosslinking agent PDM, vulcanizing agent DCP into the internal mixer, mixing for 90-100 seconds, control the temperature at 50 DEG C, discharging, to obtain the mixing rubber;

[0060] S5, the mixing rubber is sequentially cut, rolled, and packed into a triangular bag for 3-5 times, the thickness of the rubber sheet is controlled to be 0.4-0.6 mm; adjust the roll distance, control the thickness of the rubber sheet to be 8.0±0.3 mm, and then cool for 24 hours after discharging out of the sheet, to obtain the mixing rubber of the covering rubber layer.

[0061] The preparation method of the lower covering rubber layer mixing rubber of the application comprises the following steps:

[0062] S1, put the ethylene-propylene-diene rubber, natural rubber and styrene-butadiene rubber into the internal mixer, plasticizing for 250-300 seconds, discharging, and thin passing 3-4 times in the open mill, and then cooling for more than 8 hours to obtain the plasticized rubber A;

[0063] S2, put the plasticized rubber A, nano zinc oxide, stearic acid, light magnesium oxide, antioxidant MB and heat-resistant antioxidant RD into the internal mixer, pressurized mixing for 100-120 seconds, then add carbon black, paraffin oil and softening heavy oil, mixing for 120-150 seconds, discharging out of the sheet, and the discharging temperature is not more than 140 DEG C, and then cooling to obtain the first mixing rubber B;

[0064] S3, put the first mixing rubber B, adhesion antioxidant BLE, tackifier BN-1, adhesive RC, accelerator CBS, magnesium methacrylate and phenolic resin into the internal mixer, pressurized mixing for 150-200 seconds, mixing to the temperature of 105 DEG C, then discharging out of the sheet cooling, to obtain the second mixing rubber C;

[0065] S4, put the second mixing rubber C, sulfur, crosslinking agent PDM, vulcanizing agent DCP into the internal mixer, mixing for 90-100 seconds, control the temperature at 50 DEG C, discharging, to obtain the mixing rubber;

[0066] S5, the mixing rubber is sequentially cut, rolled, and packed into a triangular bag for 3-5 times, the thickness of the rubber sheet is controlled to be 0.4-0.6 mm; adjust the roll distance, control the thickness of the rubber sheet to be 8.0±0.3 mm, and then cool for 24 hours after discharging out of the sheet, to obtain the mixing rubber of the covering rubber layer.

[0067] The upper covering rubber layer, the lower covering rubber layer and the aramid fabric core layer are vulcanized and bonded, and the vulcanization conditions are controlled to be 150-155 DEG C x 30-35 min.

[0068] The test and data show that the high-temperature-resistant aramid fabric core conveyor belt cover rubber prepared in the above-mentioned examples 1-3 can achieve the purpose of the present application, and relatively speaking, example 1 is the optimal example, and the high-temperature-resistant aramid fabric core conveyor belt cover rubber prepared has the optimal high-temperature-resistant performance and adhesion performance, so that the performance of the conveyor belt made thereof is the best.

[0069] The general description of the invention involved in the present application and the description of the specific embodiments thereof should not be understood as a limitation on the technical solutions of the invention. Based on the disclosure of the present application, the skilled in the art can add, reduce or combine the disclosed technical features in the general description or / and the embodiments without violating the elements of the invention involved, to form other technical solutions within the protection scope of the present application.

Claims

1. A high-temperature resistant aramid fabric core conveyor belt, characterized in that: It includes an aramid fabric core layer, and an upper cover adhesive layer and a lower cover adhesive layer respectively disposed on both sides of the aramid fabric core layer; The aramid fabric core layer consists of a layer of aramid canvas and an impregnated layer covering the outer surface of the canvas; The raw material components of the top coating adhesive layer, by weight, include: 50-60 parts EPDM rubber, 30-40 parts natural rubber. Styrene-butadiene rubber 5-15 parts, nano zinc oxide 5-7 parts, Stearic acid 1-2 parts, light magnesium oxide 2-4 parts, Anti-aging agent MB 1-2 parts, heat and oxidation resistant agent RD 1-2 parts, 1-2 parts of adhesive antioxidant BLE, 2-4 parts of tackifier BN-1. Adhesive RC 4-8 parts, Accelerator CBS 0.5-1 part, Magnesium methacrylate 3-5 parts, phenolic resin 3-5 parts 4-6 parts silicon dioxide, 10-12 parts silica Carbon black N-660 5-15 parts, paraffin oil 300# 5-8 parts, 5-8 parts softened heavy oil, 1-2 parts sulfur, Crosslinking agent PDM 0.4-0.6 parts, vulcanizing agent DCP 2-5 parts; The raw material components of the lower cover adhesive layer, by weight, include: 50-60 parts EPDM rubber, 30-40 parts natural rubber. Styrene-butadiene rubber 5-15 parts, nano zinc oxide 5-7 parts, Stearic acid 1-2 parts, light magnesium oxide 2-4 parts, Anti-aging agent MB 1-2 parts, heat and oxidation resistant agent RD 1-2 parts, 1-2 parts of adhesive antioxidant BLE, 2-4 parts of tackifier BN-1. Adhesive RC 4-8 parts, Accelerator CBS 0.5-1 part, Magnesium methacrylate 3-5 parts, phenolic resin 3-5 parts Carbon black N-330 15-20 parts, paraffin oil 300# 5-8 parts, 5-8 parts softened heavy oil, 1-2 parts sulfur, Crosslinking agent PDM 0.4-0.6 parts, vulcanizing agent DCP 2-5 parts; The preparation method of the upper cover rubber compound includes the following steps: S1. Put EPDM rubber, natural rubber and styrene-butadiene rubber into a mixer and masticate for 250-300 seconds. Discharge the rubber and pass it through a two-roll mill 3-4 times. Sheet it up and cool it for more than 8 hours to obtain masticated rubber A. S2, put plasticized rubber A, nano zinc oxide, stearic acid, light magnesium oxide, antioxidant MB, anti-oxidation agent RD, and accelerator CBS into a mixer, pressurize and mix for 100-120 seconds, then add silica, white carbon black, carbon black, paraffin oil, and softened heavy oil, mix for 120-150 seconds, discharge the rubber and sheet, the discharge temperature should not exceed 140℃, and cool to obtain a first-stage compound rubber B; S3, put the first stage compound B, adhesive antioxidant BLE, tackifier BN-1, adhesive RC, magnesium methacrylate and phenolic resin into a mixer, pressurize and mix for 150-200 seconds, and after mixing to a temperature of 105℃, discharge the glue and cool it to obtain the second stage compound C. S4. Add the second-stage compound C, sulfur, crosslinking agent PDM, and vulcanizing agent DCP into the internal mixer, mix for 90-100 seconds, control the temperature at 50℃, discharge the compound to obtain the compound. S5, the compound rubber is cut, rolled, and triangularly wrapped 3-5 times in sequence to control the thickness of the rubber sheet to 0.4-0.6mm; the roller gap is adjusted to control the thickness of the rubber sheet to 8.0±0.3mm. After the sheet is produced, it is cooled for 24 hours to obtain the compound rubber with the covering rubber layer. The preparation method of the lower cover rubber compound includes the following steps: S1. Put EPDM rubber, natural rubber and styrene-butadiene rubber into a mixer and masticate for 250-300 seconds. Discharge the rubber and pass it through a two-roll mill 3-4 times. Sheet it up and cool it for more than 8 hours to obtain masticated rubber A. S2, put plasticized rubber A, nano zinc oxide, stearic acid, light magnesium oxide, antioxidant MB, and heat-resistant antioxidant RD into a mixer, pressurize and mix for 100-120 seconds, then add carbon black, paraffin oil, and softened heavy oil, mix for 120-150 seconds, discharge the rubber and sheet, the discharge temperature should not exceed 140℃, and cool to obtain a first-stage compound rubber B; S3, put the first-stage compound B, adhesive antioxidant BLE, tackifier BN-1, adhesive RC, accelerator CBS, magnesium methacrylate and phenolic resin into a mixer, pressurize and mix for 150-200 seconds, and after mixing to a temperature of 105℃, discharge the glue and cool it to obtain the second-stage compound C. S4. Add the second-stage compound C, sulfur, crosslinking agent PDM, and vulcanizing agent DCP into the internal mixer, mix for 90-100 seconds, control the temperature at 50℃, discharge the compound to obtain the compound. S5. The compound rubber is cut, rolled, and triangularly wrapped 3-5 times in sequence to control the thickness of the rubber sheet to 0.4-0.6 mm. The roller gap is adjusted to control the thickness of the rubber sheet to 6.0±0.3 mm. After the sheet is produced, it is cooled for 24 hours to obtain the adhesive layer compound rubber.

2. The high-temperature resistant aramid fabric core conveyor belt according to claim 1, characterized in that: The raw material components of the upper coating adhesive layer include, by weight, the following: 55 parts EPDM rubber, 35 parts natural rubber 10 parts styrene-butadiene rubber, 6 parts nano zinc oxide Stearic acid 1.2 parts, light magnesium oxide 3 parts, Anti-aging agent MB 1 part, heat and oxidation resistant agent RD 1 part, 1 part of adhesive antioxidant BLE, 3 parts of tackifier BN-1 Adhesive RC 6 parts, Accelerator CBS 0.8 parts, Magnesium methacrylate 4 parts, phenolic resin 4 parts 5 parts silicon dioxide, 11 parts silica Carbon black N-660 10 parts, paraffin oil 300# 6 parts, 6 parts softened heavy oil, 1.5 parts sulfur, Crosslinking agent PDM 0.5 parts, vulcanizing agent DCP 3 parts.

3. The high-temperature resistant aramid fabric core conveyor belt according to claim 1, characterized in that: The raw material components of the lower cover adhesive layer include, by weight, the following: 55 parts EPDM rubber, 35 parts natural rubber 10 parts styrene-butadiene rubber, 6 parts nano zinc oxide Stearic acid 1.2 parts, light magnesium oxide 3 parts, Anti-aging agent MB 1 part, heat and oxidation resistant agent RD 1 part, 1 part of adhesive antioxidant BLE, 3 parts of tackifier BN-1 Adhesive RC 6 parts, Accelerator CBS 0.8 parts, Magnesium methacrylate 4 parts, phenolic resin 4 parts Carbon black N-330 17 parts, paraffin oil 300# 6 parts, 6 parts softened heavy oil, 1.5 parts sulfur, Crosslinking agent PDM 0.5 parts, vulcanizing agent DCP 3 parts.

4. The high-temperature resistant aramid fabric core conveyor belt according to claim 1, characterized in that: The phenolic resin is CH-ED, a special tackifying resin for ethylene propylene rubber.

5. The high-temperature resistant aramid fabric core conveyor belt according to claim 1, characterized in that: The silica mentioned is precipitated silica.

6. The high-temperature resistant aramid fabric core conveyor belt according to claim 1, characterized in that: The impregnation layer is formed by a mixed latex of styrene-butadiene rubber latex and liquid phenolic resin in a ratio of 2:1-1.

2.

7. The high-temperature resistant aramid fabric core conveyor belt according to claim 1, characterized in that: The upper and lower cover adhesive layers are manufactured using a two-stage mixing method.

8. The high-temperature resistant aramid fabric core conveyor belt according to claim 7, characterized in that: The upper cover adhesive layer, the lower cover adhesive layer, and the aramid fabric core layer are bonded together by vulcanization.

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