Preparation Process of a High-Adhesion Strength Bonding Rubber for EPDM Conveyor Belt

Abstract

The present invention relates to the technical field of adhesives, and proposes a preparation process for a high-adhesion-strength bonding adhesive for EPDM conveyor belts. The high-adhesion-strength bonding adhesive for EPDM conveyor belts comprises the following components in parts by mass: 100 parts of ethylene propylene diene monomer (EPDM) rubber, 40-50 parts of filler, 8-15 parts of softening agent, 8-10 parts of activator, 1-3 parts of antioxidant, 3-5 parts of plasticizer, 3-5 parts of adhesive, 0.5-1 part of accelerator, and 3-5 parts of vulcanizing agent; the preparation process for the high-adhesion-strength bonding adhesive for EPDM conveyor belts comprises the following steps: after the EPDM rubber is plasticized, the remaining components are added for mixing to obtain the high-adhesion-strength bonding adhesive for EPDM conveyor belts. Through the above technical solution, the problem of low bonding strength of the transition bonding adhesive used between the cover rubber and the belt blank in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and specifically, to a preparation process of a high - adhesion - strength bonding adhesive for ethylene - propylene - diene monomer (EPDM) conveyor belts. Background Art

[0002] As the second - largest rubber industrial product, rubber conveyor belts are mainly used for material transportation in mines, docks, metallurgy, machinery, and warehousing industries. According to the performance of the cover rubber, they can be divided into flame - retardant conveyor belts, heat - resistant conveyor belts, wear - resistant conveyor belts, oil - resistant conveyor belts, cold - resistant conveyor belts, acid - and - alkali - resistant conveyor belts, and general - purpose conveyor belts, etc.

[0003] Ethylene - propylene - diene monomer (EPDM) has high mechanical strength and low price, and has excellent properties such as ozone resistance, weather resistance, heat resistance, low - temperature resistance, and good electrical insulation performance. Its resistance to animal and vegetable oils is better than that of natural rubber and styrene - butadiene rubber, and its air permeability is close to that of natural rubber. It is widely used as the main material for the cover rubber of conveyor belts. The adhesive rubber for corresponding products generally uses a raw rubber system in which 2 - 3 of natural rubber, styrene - butadiene rubber, and cis - 1,4 - polybutadiene rubber are used in combination. However, due to the very poor self - adhesiveness and mutual adhesiveness of EPDM, it is necessary to use a transition adhesive rubber between the cover rubber and the belt blank to achieve the adhesion of the cover rubber and the belt blank. However, the adhesion strength of the existing transition adhesive rubber is difficult to meet the standard requirements, so the EPDM conveyor belt is prone to delamination, affecting its service life. Summary of the Invention

[0004] The present invention provides a preparation process of a high - adhesion - strength bonding adhesive for EPDM conveyor belts, which solves the problem of low adhesion strength of the transition adhesive rubber used between the cover rubber and the belt blank in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] A high - adhesion - strength bonding adhesive for EPDM conveyor belts comprises the following components in parts by mass: 100 parts of EPDM, 40 - 50 parts of filler, 8 - 15 parts of softening agent, 8 - 10 parts of activator, 1 - 3 parts of antioxidant, 3 - 5 parts of plasticizer, 3 - 5 parts of adhesive, 0.5 - 1 part of accelerator, and 3 - 5 parts of vulcanizing agent.

[0007] A preparation process of a high - adhesion - strength bonding adhesive for EPDM conveyor belts comprises the following steps: After plasticizing the EPDM, add the remaining components for mixing to obtain a high - adhesion - strength bonding adhesive for EPDM conveyor belts.

[0008] An EPDM conveyor belt comprises, from top to bottom in sequence, a cover rubber, the high - adhesion - strength bonding adhesive for EPDM conveyor belts as claimed in claim 1, several layers of EP polyester cloth, the high - adhesion - strength bonding adhesive for EPDM conveyor belts as claimed in claim 1, and a cover rubber; the several layers of EP polyester cloth are all connected by adhesive rubber;

[0009] The cover rubber comprises the following components in parts by mass: 100 parts of ethylene propylene diene monomer rubber, 10 - 15 parts of glass powder, 40 - 50 parts of filler, 10 - 20 parts of plasticizer, 4 - 8 parts of softening agent, 9 - 12 parts of activator, 0.5 - 1 part of accelerator, 3 - 6 parts of adhesive, 1.5 - 2.5 parts of antioxidant, and 4 - 6 parts of vulcanizing agent;

[0010] The skim coat comprises the following components in parts by mass: 10 parts of natural rubber, 20 parts of styrene - butadiene rubber, 100 parts of reclaimed rubber, 30 - 40 parts of filler, 2.5 - 4.5 parts of adhesive, 3 - 5 parts of softening agent, 5 - 8 parts of activator, 1 - 2 parts of antioxidant, 1 - 2 parts of accelerator, 0.1 - 0.5 part of scorch retarder, and 2 - 4 parts of vulcanizing agent.

[0011] As a further technical solution, the reclaimed rubber is tire reclaimed rubber.

[0012] As a further technical solution, the several layers of EP polyester fabric are more than 2 layers.

[0013] As a further technical solution, the skim coat further comprises 2 - 4 parts of compatibilizer; the compatibilizer comprises one or more of 3 - aminopropyltriethoxysilane, N - (2 - hydroxyethyl) - N - methylaminopropyltrimethoxysilane, and 3 - [bis(2 - hydroxyethyl)amino]propane - triethoxysilane.

[0014] Since the surface of the reclaimed rubber is inert and it is a cross - linked structure material composed of rubber, carbon black, softening agent, vulcanization accelerator, etc., and has poor compatibility with natural rubber and styrene - butadiene rubber, the inventor improves the compatibility between the reclaimed rubber and natural rubber and styrene - butadiene rubber by adding 3 - aminopropyltriethoxysilane, N - (2 - hydroxyethyl) - N - methylaminopropyltrimethoxysilane, and 3 - [bis(2 - hydroxyethyl)amino]propane - triethoxysilane as compatibilizers, and improves the mechanical properties and bonding properties of the skim coat.

[0015] As a further technical solution, the compatibilizer comprises one or more of N - (2 - hydroxyethyl) - N - methylaminopropyltrimethoxysilane and 3 - [bis(2 - hydroxyethyl)amino]propane - triethoxysilane.

[0016] As a further technical solution, the compatibilizer comprises N - (2 - hydroxyethyl) - N - methylaminopropyltrimethoxysilane and 3 - [bis(2 - hydroxyethyl)amino]propane - triethoxysilane.

[0017] As a further technical solution, the mass ratio of N - (2 - hydroxyethyl) - N - methylaminopropyltrimethoxysilane to 3 - [bis(2 - hydroxyethyl)amino]propane - triethoxysilane is 1 - 3:3 - 1.

[0018] The inventors found that when N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane and 3-[bis(2-hydroxyethyl)amino]propyltriethoxysilane with a mass ratio of 1-3:3-1 are used as compatibilizers, the effect of improving the compatibility between the recycled rubber and natural rubber and styrene-butadiene rubber is the best, thus further improving the mechanical properties and bonding properties of the skim coat.

[0019] As a further technical solution, the mass ratio of the N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane and the 3-[bis(2-hydroxyethyl)amino]propyltriethoxysilane is 1:1.

[0020] As a further technical solution, each of the fillers independently includes one or more of carbon black, calcium powder, and silica;

[0021] Each of the softeners independently includes one or more of the fourth reduced line oil and pine tar;

[0022] Each of the activators independently includes zinc oxide and stearic acid;

[0023] Each of the plasticizers is disproportionated rosin independently;

[0024] Each of the anti-aging agents independently includes one or more of anti-aging agent MB, anti-aging agent RD, anti-aging agent 4010NA, and anti-aging agent BLE;

[0025] Each of the adhesives independently includes one or more of coumarone resin C5, adhesive HE, phenolic resin, adhesive RS, and adhesive RH;

[0026] Each of the accelerators independently includes one or more of accelerator CZ and accelerator H;

[0027] Each of the vulcanizing agents independently includes one or more of sulfur and peroxide;

[0028] The anti-scorching agent is anti-scorching agent CTP.

[0029] A preparation process for an ethylene propylene diene monomer conveyor belt includes the following steps:

[0030] A1. Prepare the cover rubber: After plasticizing the ethylene propylene diene monomer rubber, add the remaining components for mixing to obtain the cover rubber for standby;

[0031] A2. Prepare the skim coat: After plasticizing the natural rubber, styrene-butadiene rubber, and recycled rubber, add the remaining components for mixing to obtain the skim coat for standby;

[0032] A3. Preparation of the high - adhesion - strength bonding rubber for ethylene - propylene - diene conveyor belts: After plasticizing the ethylene - propylene - diene rubber, add the remaining components for mixing to obtain the high - adhesion - strength bonding rubber for ethylene - propylene - diene conveyor belts for standby;

[0033] A4. Preparation of ethylene - propylene - diene conveyor belts: Stack the cover rubber, bonding rubber, high - adhesion - strength bonding rubber for ethylene - propylene - diene conveyor belts and several layers of EP polyester cloth in the order from top to bottom as cover rubber, high - adhesion - strength bonding rubber for ethylene - propylene - diene conveyor belts, several layers of EP polyester cloth, high - adhesion - strength bonding rubber for ethylene - propylene - diene conveyor belts, cover rubber, and cover the bonding rubber between several layers of EP polyester cloth, and then carry out vulcanization to obtain the ethylene - propylene - diene conveyor belts.

[0034] As a further technical solution, the vulcanization temperature in A4 is 150 - 160 °C.

[0035] The working principle and beneficial effects of the present invention are as follows:

[0036] 1. The present invention provides a high - adhesion - strength bonding rubber for ethylene - propylene - diene conveyor belts, which replaces the conventional transition bonding rubber and solves the problem of low bonding strength of the transition bonding rubber used between the cover rubber and the belt blank in the prior art. The bonding rubber for ethylene - propylene - diene conveyor belts obtained by the present invention has good bonding strength and low cost.

[0037] 2. The present invention provides an ethylene - propylene - diene conveyor belt. By using the high - adhesion - strength bonding rubber for ethylene - propylene - diene conveyor belts provided by the present invention and regulating the composition of each layer, its service life can reach more than one year without delamination, solving the problem in the prior art that due to the low bonding strength of the transition bonding rubber, the ethylene - propylene - diene conveyor belt is prone to delamination, affecting its service life. Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0039] In the following examples and comparative examples, the recycled rubber is all tire recycled rubber, and the ethylene - propylene - diene rubber is all ethylene - propylene - diene rubber 4045.

[0040] Example 1

[0041] A1. Preparation of cover rubber: After plasticizing 100 parts of ethylene propylene diene monomer (EPDM) rubber at 70 °C, add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD, and conduct the first mixing at 115 °C. Then add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 part of sulfur, and conduct the second mixing at 100 °C. After that, calender it into sheets and roll it up for standby;

[0042] A2. Preparation of skim rubber: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55 °C, add 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 part of scorch retarder CTP, and conduct the first mixing at 120 °C. Then add 1.2 parts of accelerator CZ and 2.2 parts of sulfur, and conduct the second mixing at 105 °C. After that, calender it into sheets and roll it up for standby;

[0043] A3. Preparation of bonding rubber: After plasticizing 100 parts of EPDM rubber at 70 °C, add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115 °C. Then add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 part of sulfur, and conduct the second mixing at 100 °C. After that, calender it into sheets and roll it up for standby;

[0044] A4. Preparation of EPDM conveyor belt: Cover the skim rubber between 5 layers of EP polyester fabric, attach the bonding rubber to the surfaces of the top and bottom EP polyester fabrics, attach the cover rubber to the outer surfaces of the bonding rubber, and vulcanize it on a flat vulcanizing machine at 155 °C to obtain the EPDM conveyor belt.

[0045] Example 2

[0046] A1. Preparation of cover rubber: After plasticizing 100 parts of EPDM rubber at 70 °C, add 10 parts of glass powder, 40 parts of carbon black N330, 10 parts of disproportionated rosin, 2 parts of reduced fourth-line oil, 2 parts of pine tar, 7 parts of zinc oxide, 2 parts of stearic acid, 3 parts of phenolic resin, and 1.5 parts of antioxidant MB, and conduct the first mixing at 115 °C. Then add 0.3 part of accelerator CZ, 0.2 part of accelerator H, 3.5 parts of dicumyl peroxide, and 0.5 part of sulfur, and conduct the second mixing at 100 °C. After that, calender it into sheets and roll it up for standby;

[0047] A2. Preparation of the skim coat: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55°C, add 10 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 0.5 part of adhesive HE, 3 parts of pine tar, 3 parts of zinc oxide, 2 parts of stearic acid, 1 part of antioxidant BLE, and 0.1 part of scorch retarder CTP, and conduct the first mixing at 120°C. Then add 1 part of accelerator CZ and 2 parts of sulfur, conduct the second mixing at 105°C, roll it into sheets, and coil for standby;

[0048] A3. Preparation of the bonding adhesive: After plasticizing 100 parts of ethylene propylene diene monomer rubber (EPDM) at 70°C, add 35 parts of carbon black N660, 5 parts of silica, 8 parts of reduced four-line oil, 7 parts of zinc oxide, 1 part of stearic acid, 0.5 part of antioxidant RD, 0.5 part of antioxidant 4010NA, 3 parts of disproportionated rosin, 1.5 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115°C. Then add 0.5 part of accelerator CZ, 1.5 parts of dicumyl peroxide, and 1.5 parts of sulfur, conduct the second mixing at 100°C, roll it into sheets, and coil for standby;

[0049] A4. Preparation of the EPDM conveyor belt: Cover 6 layers of EP polyester fabric with the skim coat, attach the bonding adhesive to the surfaces of the top and bottom EP polyester fabrics, attach the cover rubber to the outer surfaces of the bonding adhesive, and conduct vulcanization on a flat vulcanizer at 150°C to obtain the EPDM conveyor belt.

[0050] Example 3

[0051] A1. Preparation of the cover rubber: After plasticizing 100 parts of ethylene propylene diene monomer rubber (EPDM) at 70°C, add 15 parts of glass powder, 50 parts of carbon black N330, 20 parts of disproportionated rosin, 2 parts of reduced four-line oil, 6 parts of pine tar, 10 parts of zinc oxide, 2 parts of stearic acid, 6 parts of phenolic resin, 2 parts of antioxidant MB, and 0.5 part of antioxidant RD, and conduct the first mixing at 115°C. Then add 0.5 part of accelerator CZ, 0.5 part of accelerator H, 4 parts of dicumyl peroxide, and 2 parts of sulfur, conduct the second mixing at 100°C, roll it into sheets, and coil for standby;

[0052] A2. Preparation of the skim coat: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55°C, add 10 parts of carbon black N330, 10 parts of calcium powder, 20 parts of silica, 3.5 parts of coumarone resin C5, 1 part of adhesive HE, 5 parts of pine tar, 5 parts of zinc oxide, 3 parts of stearic acid, 2 parts of antioxidant BLE, and 0.5 part of scorch retarder CTP, and conduct the first mixing at 120°C. Then add 2 parts of accelerator CZ and 4 parts of sulfur, conduct the second mixing at 105°C, roll it into sheets, and coil for standby;

[0053] A3. Preparation of the bonding adhesive: After plasticizing 100 parts of ethylene propylene diene monomer (EPDM) rubber at 70°C, add 45 parts of carbon black N660, 5 parts of silica, 15 parts of reduced fourth-line oil, 7 parts of zinc oxide, 3 parts of stearic acid, 1.5 parts of antioxidant RD, 1.5 parts of antioxidant 4010NA, 5 parts of disproportionated rosin, 2.5 parts of adhesive RS, and 2.5 parts of adhesive RH, and conduct the first mixing at 115°C. Then add 1 part of accelerator CZ, 3.5 parts of dicumyl peroxide, and 1.5 parts of sulfur, and conduct the second mixing at 100°C. After that, roll it into sheets and store in rolls for later use;

[0054] A4. Preparation of the EPDM conveyor belt: Cover the bonding adhesive between 6 layers of EP polyester fabric, attach the bonding adhesive to the surfaces of the top and bottom EP polyester fabrics, attach the covering rubber to the outer surfaces of the bonding adhesive, and vulcanize it on a flat vulcanizer at 160°C to obtain the EPDM conveyor belt.

[0055] Example 4

[0056] A1. Preparation of the covering rubber: After plasticizing 100 parts of EPDM rubber at 70°C, add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD, and conduct the first mixing at 115°C. Then add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 part of sulfur, and conduct the second mixing at 100°C. After that, roll it into sheets and store in rolls for later use;

[0057] A2. Preparation of the bonding adhesive: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of recycled rubber at 55°C, add 2 parts of 3-aminopropyltriethoxysilane, 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 part of scorch retarder CTP, and conduct the first mixing at 120°C. Then add 1.2 parts of accelerator CZ and 2.2 parts of sulfur, and conduct the second mixing at 105°C. After that, roll it into sheets and store in rolls for later use;

[0058] A3. Preparation of the bonding adhesive: After plasticizing 100 parts of EPDM rubber at 70°C, add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115°C. Then add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 parts of sulfur, and conduct the second mixing at 100°C. After that, roll it into sheets and store in rolls for later use;

[0059] A4. Preparation of EPDM conveyor belt: Cover the adhesive between 5 layers of EP polyester fabric, attach the bonding adhesive to the surfaces of the topmost and bottommost EP polyester fabrics, attach the cover rubber to the outer surfaces of the bonding adhesive, and vulcanize on a flat vulcanizer at 155 °C to obtain the EPDM conveyor belt.

[0060] Example 5

[0061] A1. Preparation of cover rubber: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70 °C, add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD, and conduct the first mixing at 115 °C. Then add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 part of sulfur, and conduct the second mixing at 100 °C. After that, calender into sheets and roll up for standby;

[0062] A2. Preparation of adhesive: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55 °C, add 2 parts of N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane, 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 part of scorch retarder CTP, and conduct the first mixing at 120 °C. Then add 1.2 parts of accelerator CZ and 2.2 parts of sulfur, and conduct the second mixing at 105 °C. After that, calender into sheets and roll up for standby;

[0063] A3. Preparation of bonding adhesive: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70 °C, add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115 °C. Then add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 part of sulfur, and conduct the second mixing at 100 °C. After that, calender into sheets and roll up for standby;

[0064] A4. Preparation of EPDM conveyor belt: Cover the adhesive between 5 layers of EP polyester fabric, attach the bonding adhesive to the surfaces of the topmost and bottommost EP polyester fabrics, attach the cover rubber to the outer surfaces of the bonding adhesive, and vulcanize on a flat vulcanizer at 155 °C to obtain the EPDM conveyor belt.

[0065] Example 6

[0066] A1. Preparation of cover rubber: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD. Conduct the first mixing at 115°C, then add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 part of sulfur. Conduct the second mixing at 100°C, then calender into sheets and roll up for standby;

[0067] A2. Preparation of skim rubber: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55°C, add 2 parts of 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane, 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 part of scorch retarder CTP. Conduct the first mixing at 120°C, then add 1.2 parts of accelerator CZ and 2.2 parts of sulfur. Conduct the second mixing at 105°C, then calender into sheets and roll up for standby;

[0068] A3. Preparation of bonding rubber: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH. Conduct the first mixing at 115°C, then add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 part of sulfur. Conduct the second mixing at 100°C, then calender into sheets and roll up for standby;

[0069] A4. Preparation of ethylene propylene diene conveyor belt: Cover the skim rubber between 5 layers of EP polyester fabric, attach the bonding rubber to the surfaces of the topmost and bottommost EP polyester fabric, attach the cover rubber to the outer surfaces of the bonding rubber, and vulcanize on a flat vulcanizer at 155°C to obtain the ethylene propylene diene conveyor belt.

[0070] Example 7

[0071] A1. Preparation of cover rubber: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD. Conduct the first mixing at 115°C, then add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 part of sulfur. Conduct the second mixing at 100°C, then calender into sheets and roll up for standby;

[0072] A2. Preparation of the skim coat: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55°C, add 3 parts of N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane, 1 part of 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane, 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 parts of scorch retarder CTP, and conduct the first mixing at 120°C. Then add 1.2 parts of accelerator CZ and 2.2 parts of sulfur, and conduct the second mixing at 105°C. After that, roll it into sheets and set aside in rolls;

[0073] A3. Preparation of the bonding adhesive: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115°C. Then add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 parts of sulfur, and conduct the second mixing at 100°C. After that, roll it into sheets and set aside in rolls;

[0074] A4. Preparation of the ethylene propylene diene monomer conveyor belt: Cover the skim coat between 5 layers of EP polyester fabric, attach the bonding adhesive to the surfaces of the topmost and bottommost EP polyester fabric, attach the cover rubber to the outer surfaces of the bonding adhesive, and conduct vulcanization on a flat vulcanizer at 155°C to obtain the ethylene propylene diene monomer conveyor belt.

[0075] Example 8

[0076] A1. Preparation of the cover rubber: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD, and conduct the first mixing at 115°C. Then add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 parts of sulfur, and conduct the second mixing at 100°C. After that, roll it into sheets and set aside in rolls;

[0077] A2. Preparation of the skim coat: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55°C, add 2 parts of N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane, 2 parts of 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane, 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 parts of scorch retarder CTP, and conduct the first mixing at 120°C. Then add 1.2 parts of accelerator CZ and 2.2 parts of sulfur, conduct the second mixing at 105°C, roll it into sheets, and coil for standby;

[0078] A3. Preparation of the bonding adhesive: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115°C. Then add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 parts of sulfur, conduct the second mixing at 100°C, roll it into sheets, and coil for standby;

[0079] A4. Preparation of the ethylene propylene diene monomer conveyor belt: Cover the skim coat between 5 layers of EP polyester fabric, attach the bonding adhesive to the surfaces of the topmost and bottommost EP polyester fabrics, attach the cover rubber to the outer surfaces of the bonding adhesive, and conduct vulcanization on a flat vulcanizing machine at 155°C to obtain the ethylene propylene diene monomer conveyor belt.

[0080] Example 9

[0081] A1. Preparation of the cover rubber: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD, and conduct the first mixing at 115°C. Then add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 part of sulfur, conduct the second mixing at 100°C, roll it into sheets, and coil for standby;

[0082] A2. Preparation of the skim coat: Knead 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55°C. Then add 1 part of N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane, 3 parts of 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane, 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 parts of scorch retarder CTP, and conduct the first mixing at 120°C. Next, add 1.2 parts of accelerator CZ and 2.2 parts of sulfur, and conduct the second mixing at 105°C. After that, calender into sheets and roll up for standby;

[0083] A3. Preparation of the bonding adhesive: Knead 100 parts of ethylene propylene diene monomer (EPDM) rubber at 70°C. Then add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115°C. Next, add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 parts of sulfur, and conduct the second mixing at 100°C. After that, calender into sheets and roll up for standby;

[0084] A4. Preparation of the EPDM conveyor belt: Cover the skim coat between 5 layers of EP polyester fabric, attach the bonding adhesive to the surfaces of the topmost and bottommost EP polyester fabrics, and attach the cover rubber to the outer surfaces of the bonding adhesive. Then cure on a flat vulcanizer at 155°C to obtain the EPDM conveyor belt.

[0085] Example 10

[0086] A1. Preparation of the cover rubber: Knead 100 parts of ethylene propylene diene monomer (EPDM) rubber at 70°C. Then add 13 parts of glass powder, 46 parts of carbon black N330, 15 parts of disproportionated rosin, 6 parts of reduced fourth-line oil, 10 parts of zinc oxide, 1 part of stearic acid, 4 parts of phenolic resin, 1.2 parts of antioxidant MB, and 1.2 parts of antioxidant RD, and conduct the first mixing at 115°C. Next, add 0.4 part of accelerator CZ, 0.4 part of accelerator H, 5 parts of dicumyl peroxide, and 0.6 parts of sulfur, and conduct the second mixing at 100°C. After that, calender into sheets and roll up for standby;

[0087] A2. Preparation of the skim coat: After plasticizing 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, and 100 parts of reclaimed rubber at 55°C, add 2 parts of 3-aminopropyltriethoxysilane, 2 parts of 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane, 15 parts of carbon black N330, 10 parts of calcium powder, 10 parts of silica, 2 parts of coumarone resin C5, 1.6 parts of adhesive HE, 4 parts of pine tar, 4.6 parts of zinc oxide, 2 parts of stearic acid, 1.6 parts of antioxidant BLE, and 0.4 parts of scorch retarder CTP, and conduct the first mixing at 120°C. Then add 1.2 parts of accelerator CZ and 2.2 parts of sulfur, and conduct the second mixing at 105°C. After that, roll it into sheets and set aside for later use;

[0088] A3. Preparation of the bonding adhesive: After plasticizing 100 parts of ethylene propylene diene monomer rubber at 70°C, add 30 parts of carbon black N660, 12 parts of silica, 12 parts of reduced fourth-line oil, 8.4 parts of zinc oxide, 0.84 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant 4010NA, 4 parts of disproportionated rosin, 2.4 parts of adhesive RS, and 1.5 parts of adhesive RH, and conduct the first mixing at 115°C. Then add 0.83 part of accelerator CZ, 3.3 parts of dicumyl peroxide, and 1.25 parts of sulfur, and conduct the second mixing at 100°C. After that, roll it into sheets and set aside for later use;

[0089] A4. Preparation of the ethylene propylene diene monomer conveyor belt: Cover the skim coat between 5 layers of EP polyester fabric, attach the bonding adhesive to the surfaces of the top and bottom EP polyester fabrics, attach the cover rubber to the outer surfaces of the bonding adhesive, and conduct vulcanization on a flat vulcanizer at 155°C to obtain the ethylene propylene diene monomer conveyor belt.

[0090] Refer to Method A in GB / T 6759-2013 "Test Method for Interlayer Adhesion Strength of Conveyor Belts" to measure the adhesion strength of the ethylene propylene diene monomer conveyor belts obtained in Examples 1 to 3, and record the test results in Table 1.

[0091] Table 1 Interlayer Adhesion Strength of Ethylene Propylene Diene Monomer Conveyor Belts in Examples 1 to 3

[0092] Adhesive strength between cover rubber and bonding rubber (N / mm) Adhesive strength between bonding rubber and EP polyester fabric (N / mm) Example 1 20.5 17.1 Example 2 19.6 15.9 Example 3 22.1 18.2

[0093] It can be seen from Table 1 that the adhesion strength between the bonding adhesive and the cover rubber provided by the present invention is above 19.6 N / mm, and the adhesion strength with the EP polyester fabric is above 15.9 N / mm, showing excellent bonding performance.

[0094] The adhesives obtained in Example 1 and Examples 4 to 10 were tested for tensile strength according to the method of GB / T 528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress - strain properties". The ethylene - propylene - diene monomer conveyor belts obtained in Example 1 and Examples 4 to 10 were tested for the adhesion strength between the adhesive and the EP polyester fabric according to Method A in GB / T 6759-2013 "Test method for adhesion strength between conveyor belt plies". The test results are recorded in Table 2.

[0095] Table 2 Tensile strength of the adhesives and adhesion strength between the adhesives and EP polyester fabric in Example 1 and Examples 4 to 10

[0096] Tensile strength (MPa) Adhesive strength between bonding rubber and EP polyester fabric (N / mm) Example 1 15.3 21.2 Example 4 16.0 21.5 Example 5 16.4 21.7 Example 6 16.5 21.8 Example 7 17.6 22.3 Example 8 18.1 22.6 Example 9 17.8 22.4 Example 10 17.1 22.0

[0097] As can be seen from Table 2, the tensile strength of the adhesive provided by the present invention is above 15.3 MPa, having good mechanical properties. At the same time, the adhesion strength between the adhesive and the EP polyester fabric is as high as above 21.2 N / mm, having excellent bonding properties.

[0098] Compared with Example 1, in Example 4, 3 - aminopropyltriethoxysilane was added; in Example 5, N-(2 - hydroxyethyl)-N - methylaminopropyltrimethoxysilane was added; in Example 6, 3-[bis(2 - hydroxyethyl)amino]propane - triethoxysilane was added. The tensile strength of the adhesives obtained in Examples 4 to 6 and their adhesion strength with the EP polyester fabric are higher than those in Example 1. This shows that 3 - aminopropyltriethoxysilane, N-(2 - hydroxyethyl)-N - methylaminopropyltrimethoxysilane, and 3-[bis(2 - hydroxyethyl)amino]propane - triethoxysilane can improve the mechanical properties and bonding properties of the adhesive.

[0099] Compared with Example 7 and Example 9, in Example 8, the mass ratio of N-(2 - hydroxyethyl)-N - methylaminopropyltrimethoxysilane to 3-[bis(2 - hydroxyethyl)amino]propane - triethoxysilane is 1:1; in Example 7, the mass ratio of N-(2 - hydroxyethyl)-N - methylaminopropyltrimethoxysilane to 3-[bis(2 - hydroxyethyl)amino]propane - triethoxysilane is 3:1; in Example 9, the mass ratio of N-(2 - hydroxyethyl)-N - methylaminopropyltrimethoxysilane to 3-[bis(2 - hydroxyethyl)amino]propane - triethoxysilane is 1:3. The tensile strength of the adhesive obtained in Example 8 and its adhesion strength with the EP polyester fabric are better than those in Example 7 and Example 9. This shows that when the mass ratio of N-(2 - hydroxyethyl)-N - methylaminopropyltrimethoxysilane to 3-[bis(2 - hydroxyethyl)amino]propane - triethoxysilane is 1:1, the mechanical properties and bonding properties of the obtained adhesive are the best.

[0100] Compared with Example 8, in Example 8, N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane and 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane were added. In Example 10, 3-aminopropyltriethoxysilane and 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane were added. The tensile strength of the adhesive tape obtained in Example 10 and the adhesion strength to the EP polyester cloth were both inferior to those in Example 8. This shows that the effect of using N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane and 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane in combination to improve the mechanical properties and bonding properties of the adhesive tape is better than that of using 3-aminopropyltriethoxysilane and 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane in combination.

[0101] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ternary ethylene propylene rubber conveyor belt, characterized in that, It includes a cover rubber, a high-adhesion strength bonding rubber for ethylene propylene diene monomer (EPDM) conveyor belt, several layers of EP polyester fabric, a high-adhesion strength bonding rubber for EPDM conveyor belt, and a cover rubber from top to bottom in sequence; the several layers of EP polyester fabric are all connected by bonding rubber. The cover rubber includes the following components in parts by mass: 100 parts of ethylene propylene diene monomer rubber, 10 - 15 parts of glass powder, 40 - 50 parts of filler, 10 - 20 parts of plasticizer, 4 - 8 parts of softening agent, 9 - 12 parts of activator, 0.5 - 1 part of accelerator, 3 - 6 parts of adhesive, 1.5 - 2.5 parts of antioxidant, and 4 - 6 parts of vulcanizing agent. The bonding rubber includes the following components in parts by mass: 10 parts of natural rubber, 20 parts of styrene-butadiene rubber, 100 parts of reclaimed rubber, 30 - 40 parts of filler, 2.5 - 4.5 parts of adhesive, 3 - 5 parts of softening agent, 5 - 8 parts of activator, 1 - 2 parts of antioxidant, 1 - 2 parts of accelerator, 0.1 - 0.5 part of scorch retarder, 2 - 4 parts of vulcanizing agent, and 2 - 4 parts of compatibilizer; the compatibilizer includes N-(2-hydroxyethyl)-N-methylaminopropyltrimethoxysilane and 3-[bis(2-hydroxyethyl)amino]propane-triethoxysilane with a mass ratio of 1 - 3:3 - 1. The high-adhesion strength bonding rubber for EPDM conveyor belt includes the following components in parts by mass: 100 parts of ethylene propylene diene monomer rubber, 40 - 50 parts of filler, 8 - 15 parts of softening agent, 8 - 10 parts of activator, 1 - 3 parts of antioxidant, 3 - 5 parts of plasticizer, 3 - 5 parts of adhesive, 0.5 - 1 part of accelerator, and 3 - 5 parts of vulcanizing agent.

2. The ternary ethylene propylene rubber conveyor belt according to claim 1, characterized in that, Each of the fillers independently includes one or more of carbon black, calcium powder, and silica. Each of the softening agents independently includes one or more of reduced fourth-line oil and pine tar. Each of the activators independently includes zinc oxide and stearic acid. Each of the plasticizers is independently disproportionated rosin. Each of the antioxidants independently includes one or more of antioxidant MB, antioxidant RD, antioxidant 4010NA, and antioxidant BLE. Each of the adhesives independently includes one or more of coumarone resin C5, adhesive HE, phenolic resin, adhesive RS, and adhesive RH. Each of the accelerators independently includes one or more of accelerator CZ and accelerator H. Each of the vulcanizing agents independently includes one or more of sulfur and peroxide. The scorch retarder is scorch retarder CTP.

3. The preparation process of the ternary ethylene propylene rubber conveyor belt according to any one of claims 1 to 2, characterized in that, It includes the following steps: A1. Prepare the cover rubber: After plasticizing the ethylene propylene diene monomer rubber, add the remaining components for mixing to obtain the cover rubber for standby. A2. Prepare the bonding rubber: After plasticizing the natural rubber, styrene-butadiene rubber, and reclaimed rubber, add the remaining components for mixing to obtain the bonding rubber for standby. A3. Prepare the high-adhesion strength bonding rubber for EPDM conveyor belt: After plasticizing the ethylene propylene diene monomer rubber, add the remaining components for mixing to obtain the high-adhesion strength bonding rubber for EPDM conveyor belt for standby. A4. Preparation of ethylene propylene diene monomer (EPDM) conveyor belt: Stack the cover rubber, skim coat, high-bonding-strength EPDM conveyor belt bonding rubber and several layers of EP polyester fabric in the order from top to bottom as cover rubber, high-bonding-strength EPDM conveyor belt bonding rubber, several layers of EP polyester fabric, high-bonding-strength EPDM conveyor belt bonding rubber, cover rubber, and cover each layer of EP polyester fabric with skim coat, and then vulcanize to obtain the EPDM conveyor belt.

4. The preparation process of the ternary ethylene propylene rubber conveyor belt according to claim 3, characterized in that, In A4, the vulcanization temperature is 150~160°C.