Environment-friendly aramid fiber rope flame-retardant conveyor belt and preparation method thereof

Abstract

This invention belongs to the field of conveyor belt technology and discloses an environmentally friendly aramid rope flame-retardant conveyor belt and its preparation method. The environmentally friendly aramid rope flame-retardant conveyor belt comprises, from top to bottom, a cover rubber, a core layer rubber, aramid rope, a core layer rubber, and a cover rubber. The cover rubber contains chloroprene rubber, modified chlorosulfonated polyethylene rubber, carbon black, activated glass fiber powder, decabromodiphenyl ether, zinc oxide, zinc borate, magnesium oxide, stearic acid, antioxidant, accelerator, and sulfur. The core layer rubber contains chloroprene rubber, natural rubber, molybdenum-based high-vinyl polybutadiene rubber, zinc oxide, stearic acid, sulfur, adhesive, accelerator, antioxidant, and coumarone. Through the matching and synergy of various systems, the tensile strength, wear resistance, impact resistance, flame retardant and antistatic properties of the rubber compound, as well as the coordination of the components with the core, are ensured, thereby manufacturing an environmentally friendly aramid rope flame-retardant conveyor belt with excellent comprehensive performance.

Description

Technical Field

[0001] This invention relates to the field of conveyor belt technology, and in particular to an environmentally friendly flame-retardant aramid rope conveyor belt and its preparation method. Background Technology

[0002] Conveyor belts are the main transportation tool for conveying materials in underground coal mines. Due to the special application environment of coal mines, such as high gas, high dust, long distances, and large transport volumes, the fabric-laminated flame-retardant conveyor belts used in coal mines need to have high flame-retardant and anti-static properties as well as good physical and mechanical properties. Currently, the main conveyor belts used in underground coal mines are generally steel cord conveyor belts. Steel cord conveyor belts have high strength, long service life, high joint strength, and good troughing performance, and can meet the needs of conveying materials at large angles. However, steel cord conveyor belts are heavy, consume a lot of energy, are easily torn, and the coating on the surface of the steel cord is easily peeled off after repeated operation. Long-term operation and damage from material impact can easily cause corrosion of the steel cord, leading to belt breakage and other problems.

[0003] Aramid fiber possesses superior overall performance, with its most prominent characteristics being high strength, high modulus, and low density. Its surface strength can reach over 20.0 CN / dtex, which is 5 to 7 times that of steel and more than twice that of general organic chemical fibers. Its density is not significantly different from ordinary chemical fibers, and a single layer of aramid with a skeleton can achieve a strength of 4000 N / mm², meeting high, medium, and low strength requirements. Due to its outstanding overall performance, aramid fiber is the ideal skeleton material for manufacturing flame-retardant conveyor belts.

[0004] Therefore, providing a flame-retardant conveyor belt with aramid as the skeleton layer is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide an environmentally friendly flame-retardant aramid rope conveyor belt and its preparation method, so as to solve the technical problem of easy corrosion and breakage of steel wire rope core conveyor belts.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] This invention provides an environmentally friendly flame-retardant aramid rope conveyor belt, wherein the environmentally friendly flame-retardant aramid rope conveyor belt comprises, from top to bottom, a cover rubber, a core layer rubber, an aramid rope, a core layer rubber, and a cover rubber.

[0008] The covering adhesive is prepared from raw materials comprising the following parts by weight:

[0009] 70-90 parts of chloroprene rubber, 20-30 parts of modified chlorosulfonated polyethylene rubber, 15-25 parts of carbon black, 15-20 parts of activated glass fiber powder, 15-20 parts of decabromodiphenyl ether, 4-10 parts of zinc oxide, 8-15 parts of zinc borate, 0.5-5 parts of magnesium oxide, 0.5-5 parts of stearic acid, 1-3 parts of antioxidant, 1-5 parts of accelerator, and 0.5-2 parts of sulfur;

[0010] The core layer adhesive is prepared from raw materials comprising the following parts by weight:

[0011] Chloroprene rubber 60-80 parts, natural rubber 30-40 parts, molybdenum-based high vinyl polybutadiene rubber 5-20 parts, zinc oxide 4-15 parts, stearic acid 0.5-5 parts, sulfur 0.5-4 parts, adhesive 5-10 parts, accelerator 0.5-5 parts, antioxidant 0.5-5 parts, coumarone 2-5 parts.

[0012] Preferably, in the above-mentioned environmentally friendly aramid rope flame-retardant conveyor belt, the thickness ratio of the cover rubber, core layer rubber, aramid rope, core layer rubber and cover rubber is 4-15:1-2:3-6:1-2:3-6.

[0013] Preferably, in the above-mentioned environmentally friendly aramid rope flame-retardant conveyor belt, the carbon black is a mixture of N220 and N330;

[0014] The antioxidant is a mixture of antioxidant 4010Na and antioxidant RD;

[0015] The accelerator is one or both of accelerator DM and accelerator TMTD;

[0016] The adhesive is one or more of adhesive RS, adhesive RF-90, adhesive ADA, and adhesive PM-18.

[0017] Preferably, in the above-mentioned environmentally friendly aramid rope flame-retardant conveyor belt, the preparation method of the cover rubber includes the following steps:

[0018] The chloroprene rubber and modified chlorosulfonated polyethylene rubber are first mixed, then carbon black, activated glass fiber powder, decabromodiphenyl ether, zinc oxide, zinc borate, magnesium oxide, stearic acid and antioxidant are added for the second mixing, then accelerator and sulfur are added for the third mixing, and after the third mixing is completed, calendering is performed to obtain the cover rubber.

[0019] Preferably, in the above-mentioned environmentally friendly aramid rope flame-retardant conveyor belt, the first mixing time is 60-120s and the temperature is 60-90℃.

[0020] The second mixing time is 30-90 seconds, and the temperature is 120-140°C;

[0021] The third mixing time is 60-120 seconds, and the temperature is 70-90°C;

[0022] The rolling temperature is 90–100°C.

[0023] Preferably, in the above-mentioned environmentally friendly aramid rope flame-retardant conveyor belt, the preparation method of the core layer adhesive includes the following steps:

[0024] Chloroprene rubber, natural rubber and molybdenum-based high-vinyl polybutadiene rubber are initially mixed, then zinc oxide, stearic acid, adhesive, antioxidant and coumarone are added for secondary mixing, and finally sulfur and accelerator are added for tertiary mixing. After mixing, the mixture is calendered to obtain the core layer rubber.

[0025] Preferably, in the above-mentioned environmentally friendly aramid rope flame-retardant conveyor belt, the initial mixing time is 60-120 seconds and the temperature is 60-90°C.

[0026] The secondary mixing time is 30-90 seconds, and the temperature is 120-140°C;

[0027] The three mixing times are 60–120 seconds and the temperature is 70–90°C.

[0028] The rolling temperature is 90–100°C.

[0029] This invention also provides a method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt, comprising the following steps:

[0030] Core layer adhesive is applied to both sides of the aramid rope, and then cover adhesive is applied to both sides. After vulcanization, an environmentally friendly flame-retardant aramid rope conveyor belt is obtained.

[0031] Preferably, in the above-mentioned method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt, the vulcanization conditions are: temperature of 130-150°C, time of 20-30 min, and pressure of 3-5 MPa.

[0032] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0033] This invention provides an environmentally friendly flame-retardant aramid rope conveyor belt, comprising, from top to bottom, a cover rubber, a core rubber, an aramid rope, and a cover rubber. The core rubber, composed of chloroprene rubber, natural rubber, and molybdenum-based high-vinyl polybutadiene rubber, improves the adhesive properties, heat and oxygen aging resistance, and flame-retardant properties of the rubber layer. The cover rubber, using a combination of chloroprene rubber and modified chlorosulfonated polyethylene rubber (MCSM), enhances tensile strength, elongation, and service life. Activated glass fiber powder effectively prevents heat transfer from high-temperature materials to the core rubber and aramid rope, thus avoiding problems such as delamination, blistering, and overheating aging, and increasing the conveyor belt's heat resistance. The use of decabromodiphenyl ether, zinc oxide, zinc borate, magnesium oxide, and stearic acid as a flame-retardant system improves the flame-retardant properties of the cover rubber and reduces the generation of toxic gases during combustion. Through the matching and synergistic effect of various systems, the strength, elongation, wear resistance, impact resistance, flame-retardant and antistatic properties of the rubber compound, as well as the coordination of the components with the core, are ensured, resulting in an environmentally friendly flame-retardant aramid rope conveyor belt with superior overall performance. Detailed Implementation

[0034] This invention provides an environmentally friendly flame-retardant aramid rope conveyor belt, which consists of, from top to bottom, a cover rubber, a core layer rubber, an aramid rope, a core layer rubber, and a cover rubber.

[0035] In this invention, the covering adhesive is prepared from raw materials comprising the following parts by weight:

[0036] 70-90 parts of chloroprene rubber, 20-30 parts of modified chlorosulfonated polyethylene rubber, 15-25 parts of carbon black, 15-20 parts of activated glass fiber powder, 15-20 parts of decabromodiphenyl ether, 4-10 parts of zinc oxide, 8-15 parts of zinc borate, 0.5-5 parts of magnesium oxide, 0.5-5 parts of stearic acid, 1-3 parts of antioxidant, 1-5 parts of accelerator, and 0.5-2 parts of sulfur;

[0037] In the cover adhesive, the mass fraction of chloroprene rubber is preferably 70-90 parts, more preferably 72-87 parts, and even more preferably 76-84 parts;

[0038] In the covering adhesive, the modified chlorosulfonated polyethylene rubber is preferably 20-30 parts by mass, more preferably 21-28 parts, and even more preferably 23-26 parts by mass.

[0039] In the covering adhesive, the mass fraction of carbon black is preferably 15-25 parts, more preferably 17-23 parts, and even more preferably 19-21 parts.

[0040] In the covering adhesive, the mass fraction of activated glass fiber powder is preferably 15-20 parts, more preferably 16-19 parts, and even more preferably 17-18 parts.

[0041] In the covering adhesive, the mass fraction of decabromodiphenyl ether is preferably 15-20 parts, more preferably 16-19 parts, and even more preferably 17-18 parts.

[0042] In the covering adhesive, the zinc oxide is preferably 4 to 10 parts by mass, more preferably 5 to 9 parts, and even more preferably 6 to 8 parts by mass.

[0043] In the covering adhesive, the zinc borate is preferably 8 to 15 parts by mass, more preferably 9 to 13 parts by mass, and even more preferably 10 to 12 parts by mass.

[0044] In the covering adhesive, the mass fraction of magnesium oxide is preferably 0.5 to 5 parts, more preferably 1 to 4 parts, and even more preferably 2 to 3 parts;

[0045] In the covering adhesive, the mass fraction of stearic acid is preferably 0.5 to 5 parts, more preferably 1 to 4 parts, and even more preferably 2 to 3 parts;

[0046] In the covering adhesive, the antioxidant is preferably 1 to 3 parts by weight, more preferably 1.5 to 2.5 parts, and even more preferably 1.5 to 2 parts by weight.

[0047] In the covering adhesive, the accelerator is preferably 1 to 5 parts by mass, more preferably 2 to 4 parts, and even more preferably 2 to 3 parts by mass.

[0048] In the covering adhesive, the mass fraction of sulfur is preferably 0.5 to 2 parts, more preferably 1.2 to 1.8 parts, and even more preferably 1.2 to 1.5 parts.

[0049] In this invention, the core layer adhesive is prepared from raw materials comprising the following parts by weight:

[0050] Chloroprene rubber 60-80 parts, natural rubber 30-40 parts, molybdenum-based high-vinyl polybutadiene rubber 5-20 parts, zinc oxide 4-15 parts, stearic acid 0.5-5 parts, sulfur 0.5-4 parts, adhesive 5-10 parts, accelerator 0.5-5 parts, antioxidant 0.5-5 parts, coumarone 2-5 parts;

[0051] In the core layer adhesive, the mass fraction of chloroprene rubber is preferably 60-80 parts, more preferably 65-75 parts, and even more preferably 68-72 parts.

[0052] In the core layer rubber, the mass fraction of natural rubber is preferably 30-40 parts, more preferably 32-38 parts, and even more preferably 34-36 parts;

[0053] The core layer adhesive, preferably molybdenum-based high vinyl polybutadiene rubber, is 5 to 20 parts by mass, more preferably 8 to 17 parts, and even more preferably 12 to 15 parts by mass.

[0054] In the core layer adhesive, the zinc oxide is preferably 4 to 15 parts by mass, more preferably 6 to 12 parts by mass, and even more preferably 8 to 10 parts by mass.

[0055] In the core layer adhesive, the mass fraction of stearic acid is preferably 0.5 to 5 parts, more preferably 1 to 4 parts, and even more preferably 2 to 3 parts;

[0056] In the core layer adhesive, the mass fraction of sulfur is preferably 0.5 to 4 parts, more preferably 1 to 3 parts, and even more preferably 1.5 to 2.5 parts;

[0057] In the core layer adhesive, the adhesive is preferably 5 to 10 parts by weight, more preferably 6 to 9 parts, and even more preferably 7 to 8 parts by weight.

[0058] In the core layer adhesive, the accelerator is preferably 0.5 to 5 parts by mass, more preferably 1 to 4 parts, and even more preferably 2 to 3 parts by mass.

[0059] In the core layer adhesive, the antioxidant is preferably 0.5 to 5 parts by mass, more preferably 1 to 4 parts, and even more preferably 2 to 3 parts;

[0060] In the core layer adhesive, the mass fraction of coumarone is preferably 2 to 5 parts, more preferably 2.5 to 4.5 parts, and even more preferably 3 to 4 parts.

[0061] In this invention, the modified chlorosulfonated polyethylene rubber was purchased from Taizhou Huangyan Donghai Chemical Co., Ltd.

[0062] The molybdenum-based high-vinyl polybutadiene rubber was purchased from Sinopec Baling Branch.

[0063] In this invention, the thickness ratio of the cover adhesive, core adhesive, aramid rope, core adhesive, and cover adhesive is preferably 4-15:1-2:3-6:1-2:3-6, more preferably 6-12:1.2-1.8:3.2-5.8:1.2-1.8:3.2-5.5, and even more preferably 6.5-11.5:1.4-1.6:3.5-4.5:1.4-1.6:3.5-5.

[0064] In this invention, the carbon black is preferably a mixture of N220 and N330, and the mass ratio of N220 to N330 is preferably 1:1;

[0065] The antioxidant is preferably a mixture of antioxidant 4010Na and antioxidant RD, and the mass ratio of antioxidant 4010Na to antioxidant RD is preferably 1:1.

[0066] The accelerator is preferably one or two of accelerator DM and accelerator TMTD, more preferably accelerator DM;

[0067] The adhesive is preferably one or more of adhesive RS, adhesive RF-90, adhesive ADA, and adhesive PM-18, more preferably one or more of adhesive RS, adhesive RF-90, and adhesive ADA, and even more preferably one or two of adhesive RS and adhesive RF-90.

[0068] In this invention, the method for preparing the covering adhesive includes the following steps:

[0069] The chloroprene rubber and modified chlorosulfonated polyethylene rubber are first mixed, then carbon black, activated glass fiber powder, decabromodiphenyl ether, zinc oxide, zinc borate, magnesium oxide, stearic acid and antioxidant are added for the second mixing, then accelerator and sulfur are added for the third mixing, and after the third mixing is completed, calendering is performed to obtain the cover rubber.

[0070] In this invention, the second mixing process is followed by a 8-hour resting period.

[0071] In this invention, the first mixing time is preferably 60-120s, more preferably 70-110s, and even more preferably 80-100s; the temperature is preferably 60-90℃, more preferably 65-85℃, and even more preferably 70-80℃.

[0072] The second mixing time is preferably 30-90s, more preferably 40-80s, and even more preferably 50-70s; the temperature is preferably 120-140℃, more preferably 125-138℃, and even more preferably 130-135℃.

[0073] The preferred time for the third mixing is 60–120 s, more preferably 80–110 s, and even more preferably 90–100 s; the preferred temperature is 70–90 °C, more preferably 75–85 °C, and even more preferably 78–80 °C.

[0074] The rolling temperature is preferably 90-100°C, more preferably 92-98°C, and even more preferably 95-96°C.

[0075] In this invention, the method for preparing the core layer adhesive includes the following steps:

[0076] Chloroprene rubber, natural rubber and molybdenum-based high-vinyl polybutadiene rubber are initially mixed, then zinc oxide, stearic acid, adhesive, antioxidant and coumarone are added for secondary mixing, and finally sulfur and accelerator are added for tertiary mixing. After mixing, the mixture is calendered to obtain the core layer rubber.

[0077] In this invention, the secondary mixing process is followed by a 8-hour rest period.

[0078] In this invention, the initial mixing time is 60-120s, more preferably 70-110s, and more preferably 80-100s; the temperature is 60-90℃, more preferably 65-85℃, and more preferably 70-80℃.

[0079] The secondary mixing time is 30-90s, more preferably 40-80s, and more preferably 50-70s; the temperature is 120-140℃, more preferably 125-138℃, and more preferably 130-135℃.

[0080] The time for the three mixing processes is 60-120s, more preferably 80-110s, and even more preferably 90-100s; the temperature is 70-90℃, more preferably 72-88℃, and even more preferably 75-85℃.

[0081] The rolling temperature is 90–100°C, more preferably 92–98°C, and even more preferably 95–96°C.

[0082] This invention also provides a method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt, comprising the following steps:

[0083] Core layer adhesive is applied to both sides of the aramid rope, and then cover adhesive is applied to both sides. After vulcanization, an environmentally friendly flame-retardant aramid rope conveyor belt is obtained.

[0084] In this invention, the vulcanization conditions are as follows: the temperature is preferably 130-150°C, more preferably 132-148°C, and even more preferably 135-140°C; the time is preferably 20-30 min, more preferably 22-28 min, and even more preferably 23-25 ​​min; and the pressure is preferably 3-5 MPa, more preferably 3.2-4.5 MPa, and even more preferably 3.5-4 MPa.

[0085] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0086] Example 1

[0087] A method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt includes the following steps:

[0088] (1) Mix 75 parts of chloroprene rubber and 25 parts of modified chlorosulfonated polyethylene rubber at 80°C for 100s, then add 15 parts of carbon black (N220 and N330 in a mass ratio of 1:1), 18 parts of activated glass fiber powder, 20 parts of decabromodiphenyl ether, 8 parts of zinc oxide, 10 parts of zinc borate, 2 parts of magnesium oxide, 0.5 parts of stearic acid and 1 part of antioxidant (antioxidant 4010Na and antioxidant RD in a mass ratio of 1:1) and mix at 120°C for 80s. After standing for 8 hours, add 2 parts of accelerator DM and 2 parts of sulfur and mix at 80°C for 100s. Finally, calender the sheet at 100°C to obtain the cover rubber.

[0089] (2) Mix 63 parts of chloroprene rubber, 32 parts of natural rubber and 10 parts of molybdenum-based high vinyl polybutadiene rubber at 80°C for 90s, then add 10 parts of zinc oxide, 1 part of stearic acid, 8 parts of adhesive RS, 2 parts of antioxidant (the mass ratio of antioxidant 4010Na to antioxidant RD is 1:1) and 3 parts of coumarone at 120°C for 80s, let stand for 8h, then add 2 parts of sulfur and 2 parts of accelerator DM at 80°C for 100s, and finally calender at 100°C to obtain the core layer rubber.

[0090] (3) The core layer adhesive is attached to both sides of the aramid rope, and then the cover adhesive is attached to both sides. The thickness ratio of the cover adhesive, core layer adhesive, aramid rope, core layer adhesive and cover adhesive from top to bottom is 15:2:3:2:6. Then vulcanize at 130℃ and 3MPa for 25 minutes to obtain an environmentally friendly flame-retardant aramid rope conveyor belt.

[0091] Example 2

[0092] A method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt includes the following steps:

[0093] (1) Mix 80 parts of chloroprene rubber and 23 parts of modified chlorosulfonated polyethylene rubber at 70°C for 80s, then add 22 parts of carbon black (N220 and N330 in a mass ratio of 1:1), 16 parts of activated glass fiber powder, 17 parts of decabromodiphenyl ether, 10 parts of zinc oxide, 8 parts of zinc borate, 5 parts of magnesium oxide, 4 parts of stearic acid and 2 parts of antioxidant (antioxidant 4010Na and antioxidant RD in a mass ratio of 1:1) and mix at 140°C for 60s. After standing for 8h, add 5 parts of accelerator DM and 1 part of sulfur and mix at 75°C for 80s. Finally, calender the sheet at 100°C to obtain the cover rubber.

[0094] (2) Mix 78 parts of chloroprene rubber, 30 parts of natural rubber and 8 parts of molybdenum-based high vinyl polybutadiene rubber at 90°C for 80s, then add 8 parts of zinc oxide, 0.5 parts of stearic acid, 8 parts of adhesive RS, 3 parts of antioxidant (the mass ratio of antioxidant 4010Na to antioxidant RD is 1:1) and 5 parts of coumarone at 130°C for 70s, let stand for 8h, then add 2 parts of sulfur and 2 parts of accelerator DM at 80°C for 100s, and finally calender at 100°C to obtain the core layer rubber.

[0095] (3) Apply core layer adhesive to both sides of the aramid rope, and then apply cover adhesive to both sides. The thickness ratio of cover adhesive, core layer adhesive, aramid rope, core layer adhesive and cover adhesive from top to bottom is 15:1:3:1:5. Then vulcanize at 150℃ and 5MPa for 25 minutes to obtain an environmentally friendly flame-retardant aramid rope conveyor belt.

[0096] Example 3

[0097] A method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt includes the following steps:

[0098] (1) Mix 88 parts of chloroprene rubber and 27 parts of modified chlorosulfonated polyethylene rubber at 90°C for 60s, then add 18 parts of carbon black (N220 and N330 in a mass ratio of 1:1), 15 parts of activated glass fiber powder, 20 parts of decabromodiphenyl ether, 6 parts of zinc oxide, 13 parts of zinc borate, 1 part of magnesium oxide, 3 parts of stearic acid and 3 parts of antioxidant (antioxidant 4010Na and antioxidant RD in a mass ratio of 1:1) and mix at 130°C for 70s. After standing for 8 hours, add 3 parts of accelerator DM and 0.5 parts of sulfur and mix at 80°C for 60s. Finally, calender the sheet at 100°C to obtain the cover rubber.

[0099] (2) Mix 80 parts of chloroprene rubber, 37 parts of natural rubber and 15 parts of molybdenum-based high vinyl polybutadiene rubber at 60°C for 100s, then add 6 parts of zinc oxide, 2 parts of stearic acid, 5 parts of adhesive RS, 0.5 parts of antioxidant (the mass ratio of antioxidant 4010Na to antioxidant RD is 1:1) and 3 parts of coumarone at 130°C for 70s. After standing for 8h, add 2 parts of sulfur and 2 parts of accelerator DM and mix at 80°C for 100s. Finally, calender the sheet at 100°C to obtain the core layer rubber.

[0100] (3) Apply core layer adhesive to both sides of the aramid rope, and then apply cover adhesive to both sides. The thickness ratio of cover adhesive, core layer adhesive, aramid rope, core layer adhesive and cover adhesive from top to bottom is 12:2:3:2:6. Then vulcanize at 150℃ and 3MPa for 20 minutes to obtain an environmentally friendly flame-retardant aramid rope conveyor belt.

[0101] Comparative Example 1

[0102] A method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt is consistent with that in Example 1, except that the modified chlorosulfonated polyethylene rubber is not present in the cover rubber.

[0103] Comparative Example 2

[0104] A method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt is consistent with that in Example 1, except that the core layer rubber does not contain molybdenum-based high-vinyl polybutadiene rubber.

[0105] Comparative Example 3

[0106] A method for preparing an environmentally friendly flame-retardant aramid rope conveyor belt is the same as that in Example 1, except that activated glass fiber powder is not present in the cover adhesive.

[0107] The modified chlorosulfonated polyethylene rubber mentioned above was purchased from Taizhou Huangyan Donghai Chemical Co., Ltd., and the molybdenum-based high vinyl polybutadiene rubber was purchased from Sinopec Qilu Rubber Plant.

[0108] The performance of the environmentally friendly aramid rope flame-retardant conveyor belts prepared in Examples 1-3 and Comparative Examples 1-3 was tested, and the test results are shown in Table 1.

[0109]

[0110]

[0111] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An environmentally friendly flame-retardant aramid rope conveyor belt, characterized in that, The environmentally friendly aramid rope flame-retardant conveyor belt consists of, from top to bottom, a cover rubber, a core layer rubber, an aramid rope, a core layer rubber, and a cover rubber. The covering adhesive is prepared from raw materials comprising the following parts by weight: 70-90 parts of chloroprene rubber, 20-30 parts of modified chlorosulfonated polyethylene rubber, 15-25 parts of carbon black, 15-20 parts of activated glass fiber powder, 15-20 parts of decabromodiphenyl ether, 4-10 parts of zinc oxide, 8-15 parts of zinc borate, 0.5-5 parts of magnesium oxide, 0.5-5 parts of stearic acid, 1-3 parts of antioxidant, 1-5 parts of accelerator, and 0.5-2 parts of sulfur; The core layer adhesive is prepared from raw materials comprising the following parts by weight: Chloroprene rubber 60-80 parts, natural rubber 30-40 parts, molybdenum-based high-vinyl polybutadiene rubber 5-20 parts, zinc oxide 4-15 parts, stearic acid 0.5-5 parts, sulfur 0.5-4 parts, adhesive 5-10 parts, accelerator 0.5-5 parts, antioxidant 0.5-5 parts, coumarone 2-5 parts; The adhesive is one or more of adhesive RS, adhesive RF-90, adhesive ADA, and adhesive PM-18.

2. The environmentally friendly aramid rope flame-retardant conveyor belt according to claim 1, characterized in that, The thickness ratio of the cover adhesive, core adhesive, aramid rope, core adhesive and cover adhesive is 4~15:1~2:3~6:1~2:3~6.

3. The environmentally friendly aramid rope flame-retardant conveyor belt according to claim 1 or 2, characterized in that, The carbon black is a mixture of N220 and N330; The antioxidant is a mixture of antioxidant 4010Na and antioxidant RD; The accelerator is one or both of accelerator DM and accelerator TMTD.

4. The environmentally friendly aramid rope flame-retardant conveyor belt according to claim 3, characterized in that, The preparation method of the cover adhesive includes the following steps: The chloroprene rubber and modified chlorosulfonated polyethylene rubber are first mixed, then carbon black, activated glass fiber powder, decabromodiphenyl ether, zinc oxide, zinc borate, magnesium oxide, stearic acid and antioxidant are added for the second mixing, then accelerator and sulfur are added for the third mixing, and after the third mixing is completed, calendering is performed to obtain the cover rubber.

5. The environmentally friendly aramid rope flame-retardant conveyor belt according to claim 4, characterized in that, The first mixing time is 60~120s, and the temperature is 60~90℃; The second mixing time is 30~90s, and the temperature is 120~140℃; The third mixing time is 60~120s, and the temperature is 70~90℃; The rolling temperature is 90~100℃.

6. The environmentally friendly aramid rope flame-retardant conveyor belt according to claim 4 or 5, characterized in that, The method for preparing the core layer adhesive includes the following steps: Chloroprene rubber, natural rubber and molybdenum-based high-vinyl polybutadiene rubber are initially mixed, then zinc oxide, stearic acid, adhesive, antioxidant and coumarone are added for secondary mixing, and finally sulfur and accelerator are added for tertiary mixing. After mixing, the mixture is calendered to obtain the core layer rubber.

7. The environmentally friendly aramid rope flame-retardant conveyor belt according to claim 6, characterized in that, The initial mixing time is 60~120s, and the temperature is 60~90℃; The secondary mixing time is 30~90s, and the temperature is 120~140℃; The three mixing times are 60-120 seconds and the temperature is 70-90℃. The rolling temperature is 90~100℃.

8. The method for preparing the environmentally friendly aramid rope flame-retardant conveyor belt according to any one of claims 1 to 7, characterized in that, Includes the following steps: Core layer adhesive is applied to both sides of the aramid rope, and then cover adhesive is applied to both sides. After vulcanization, an environmentally friendly flame-retardant aramid rope conveyor belt is obtained.

9. The method for preparing the environmentally friendly aramid rope flame-retardant conveyor belt according to claim 8, characterized in that, The vulcanization conditions are: temperature 130~150℃, time 20~30min, and pressure 3~5MPa.

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