CN114316454A - Heat-aging-resistant conveyor belt covering rubber and preparation method thereof - Google Patents
Heat-aging-resistant conveyor belt covering rubber and preparation method thereof Download PDFInfo
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Abstract
The invention provides a heat-aging-resistant conveyor belt covering rubber and a preparation method thereof, belonging to the technical field of high molecular compound compositions; the covering glue comprises the following components in parts by weight: 80-90 parts of chlorosulfonated polyethylene rubber, 10-20 parts of EVM (ethylene-vinyl acetate copolymer), 5-7 parts of high-activity magnesium oxide, 20-30 parts of plasticizer, 27-35 parts of wear-resistant reinforcing agent, 30-40 parts of carbon black, 6-8 parts of graphite powder, 4-5 parts of adhesive, 2-4 parts of rosin, 6-10 parts of pre-dispersed cellulose fiber, 2.5-3 parts of protective additive, 2-5 parts of antistatic agent, 1.5-2 parts of anti-aging agent, 11-15 parts of flame retardant, 6-9.2 parts of vulcanization accelerator and 5-7 parts of vulcanizing agent; the conveyer belt covering rubber prepared by the invention has the advantages of heat aging resistance, wear resistance, high tensile strength and elongation at break and high bonding strength.
Description
Technical Field
The invention relates to a heat-aging-resistant conveyor belt covering rubber and a preparation method thereof, belonging to the technical field of high molecular compound compositions.
Background
The flame-retardant conveying belt is suitable for material conveying in industries such as coal, mines, ports, electric power, metallurgy, building materials and the like, and is long in conveying distance, large in span, large in transport capacity, high in speed and high in material temperature (200-.
The prior art flame-retardant conveyor belt cover rubber mainly takes chloroprene rubber/natural rubber/butadiene rubber, nitrile rubber/polyvinyl chloride and chloroprene rubber/butadiene rubber as main materials, and the main materials all contain unsaturated carbon-carbon double bonds with poor stability, so that the heat-resistant oxygen aging resistance of the cover rubber is poor, especially when materials with high conveying temperature (200 plus 600 ℃), the aging of the conveyor belt cover rubber can be accelerated, the phenomena of cracking, chipping and the like are caused, the wear resistance, the mechanical property and the antistatic property are rapidly reduced, the bonding strength between the cover rubber and a steel wire rope conveyor belt bonding layer or a fabric core conveyor belt core is poor, and the service life of the conveyor belt is seriously influenced.
The chlorosulfonated polyethylene rubber contains saturated carbon-carbon double bonds, but the chlorosulfonated polyethylene rubber is independently used as the conveyer belt covering rubber prepared from the main body material, so that the adhesive strength between the chlorosulfonated polyethylene rubber and a steel wire rope conveyer belt adhesive layer or a fabric core conveyer belt core is low, the wear resistance is poor, the tensile strength and the elongation at break are low, and the actual improvement degree of the heat-aging resistance is very limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a heat-aging-resistant conveyor belt covering rubber and a preparation method thereof, and the following aims are achieved:
chlorosulfonated polyethylene rubber is used as a main material to prepare the conveyer belt covering rubber, so that the bonding strength, the tensile strength and the elongation at break between the covering rubber and a steel wire rope conveyer belt bonding layer or a fabric core conveyer belt core are improved; the wear resistance of the covering rubber is improved, and the heat-resistant aging performance of the covering rubber is improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the heat-aging-resistant conveyor belt covering rubber comprises the following components in parts by weight:
the adhesive is a combination of any two of cobalt neodecanoate, maleated polybutadiene resin and polybutadiene acrylate, and the mass ratio is 1: 1;
the type of the maleated polybutadiene resin is Ricobond 1756;
the polybutadiene acrylate is SR 307;
the vulcanizing agent is Luperox DC 40P-SP;
the vulcanization accelerator consists of zinc dimethacrylate and HVA-2 (PDM) in a mass ratio of (5-7): (1-2.2);
the chlorosulfonated polyethylene rubber contains 30-40 wt% of chlorine and 1.2-1.5 wt% of sulfur; the model of the EVM is Levamelt 456; the type of the carbon black is N330;
the high-activity magnesium oxide has an iodine absorption value of 180-185mgI2/gMgO；
The plasticizer consists of a Rheinine series plasticizer and hydroxyl-terminated polybutadiene, and the mass ratio of the Rheinine series plasticizer to the hydroxyl-terminated polybutadiene is (1-4): (1-3); the rhinestone series plasticizer is one of rhinestone EPS, rhinestone Asolvan T and rhinestone 10;
the wear-resistant reinforcing agent consists of silicon-containing micro powder and polytetrafluoroethylene micro powder in a mass ratio of (0.8-1.7): (1-1.8); the silicon-containing micro powder is one of fused silicon micro powder, wear-resistant ceramic powder and modified glass powder;
the protective auxiliary agent consists of an antioxidant and solid wax, and the mass ratio of the antioxidant to the solid wax is (1-1.7): (1-1.2);
the antioxidant is 4, 4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine or an antioxidant 1076;
the solid wax is microcrystalline wax or maleic anhydride grafted polyethylene wax;
the antistatic agent is a JL-XS rubber antistatic agent or a JL long-acting antistatic agent;
the anti-aging agent is one of 4, 4 '-diphenyl isopropyl diphenylamine, N- (p-toluenesulfonamido) -N' -phenyl p-phenylenediamine and octylated diphenylamine;
the flame retardant consists of chlorinated paraffin, hydroxide and a phosphorus-containing flame retardant in a mass ratio of (1-5): (1-4): (1-3);
the hydroxide is aluminum hydroxide or magnesium hydroxide;
the phosphorus-containing flame retardant is one of ammonium polyphosphate, trioctyl phosphate and melamine polyphosphate.
The preparation method of the pre-dispersed cellulose fiber comprises the following steps:
(1) surface treatment of cellulose fibers
Putting the bleached hardwood cellulose fiber with the weight percentage of 97.5-98.5% and the surface treating agent of ethyl titanate with the weight percentage of 1.5-2.5% into a high-speed mixer, discharging the materials into a low-speed mixer for cooling when the temperature of the mixed materials reaches 103-107 ℃, obtaining the cellulose fiber with the surface treatment when the temperature reaches 43-47 ℃, metering and packaging the materials, and standing for later use.
(2) Banburying and mixing of cellulose fiber
70-75 wt% of surface treated cellulose fiber, 1-3 wt% of dispersant oxidized polyethylene wax and 22-29 wt% of polymer carrier ethylene propylene diene monomer rubber are put into an internal mixer, the temperature is raised, when the temperature of the mixed material reaches 118-122 ℃, the uniformly mixed material is conveyed to a single screw extruder by a lifter for granulation, and the temperature of the single screw three sections and a machine head is controlled as follows: the temperature of the first section is 50-55 ℃, the temperature of the second section is 60-65 ℃, the temperature of the third section is 70-75 ℃, and the temperature of the machine head is 40-45 ℃ to obtain granular pre-dispersed cellulose fibers.
The preparation method of the heat-aging-resistant conveyor belt covering rubber comprises the following steps:
(1) first-stage mixing: pressurizing chlorosulfonated polyethylene rubber, EVM, high-activity magnesium oxide, a plasticizer, a wear-resistant reinforcing agent, carbon black, graphite powder, an adhesive, rosin, pre-dispersed cellulose fibers, a protective aid, an antistatic agent, an anti-aging agent and a flame retardant to 0.7MPa for mixing, discharging a mixed section of master batch to an open mill with a roller temperature of 50 ℃ for mixing for 3-5 minutes when the temperature reaches 120-125 ℃, pressing into a rubber strip suitable for processing, and standing for 10-16 hours to obtain a section of mixing rubber strip;
(2) and (3) second-stage mixing: pressurizing the first-stage mixing rubber strip, the vulcanization accelerator and the vulcanizing agent Luperox DC40P-SP in the step (1) to 0.7MPa for mixing, discharging the mixed second-stage rubber to an open mill with a roller temperature of 50 ℃ for rubber returning and mixing for 3-5 minutes when the temperature reaches 90-95 ℃, and pressing into a rubber strip suitable for processing to obtain the conveyer belt covering rubber.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides a conveyor belt covering rubber resistant to thermal-oxidative aging, which is prepared from chlorosulfonated polyethylene rubber and EVM rubber as main materials; selecting a rhinepine series plasticizer and hydroxyl-terminated polybutadiene (HTPB) liquid rubber which can participate in crosslinking as plasticizers; the conveyer belt covering rubber has good heat-resistant aging resistance and strength performance by adopting a specific anti-aging agent and a specific protection auxiliary agent; the covering adhesive prepared by the invention has the tensile strength of 27.2-27.9MPa and the elongation at break of 512-; after the heat aging test, the change rate of tensile strength is-6.6 to-6.9 percent, the change rate of elongation at break is-6.8 to-7.2 percent, the bonding strength is 12.2 to 12.9KN/m, and the abrasion loss is 172-3。
(2) The invention adopts the specific wear-resistant reinforcing agent, can improve the wear resistance of the conveyer belt covering rubber, has good wear resistance even under the condition of hot oxygen or high temperature, and has the wear consumption of 72-77mm3。
(3) The invention provides a thermal-oxidative-aging-resistant conveyor belt cover adhesive, which selects a special adhesive combination system, and a main material EVM (Levamelt 456) can be used as an adhesive; special binders cobalt neodecanoate, Ricobond1756 (maleated polybutadiene resin), SR307 (polybutadiene acrylate); the vulcanization accelerator zinc dimethacrylate and HVA-2 (PDM) also contribute to adhesion, and the adhesion strength between the covering rubber and the adhesive layer of the steel wire rope conveyor belt or the core of the fabric core conveyor belt is high in three aspects, so that the covering rubber still has good adhesion performance even under the condition of hot oxygen or high temperature; the adhesive strength of the covering adhesive prepared by the invention is 24-27KN/m, and after a heat aging test, the adhesive strength is 12.2-12.9 KN/m.
(4) The covering glue prepared by the invention has an oxygen index of 41-42 and has no crack at-40 ℃; surface resistance of 1.7-1.9 × 106Omega, the average value of the blowtorch combustion test is 1 second, the maximum value is 2 seconds, the surface temperature of the roller is 192-.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Embodiment 1 thermal aging resistant conveyor belt cover rubber and preparation method thereof
The covering glue comprises the following components in parts by weight:
the plasticizer consists of rhinepine EPS and hydroxyl-terminated polybutadiene, and the mass ratio is 1: 1;
the wear-resistant reinforcing agent consists of fused silica micro powder and polytetrafluoroethylene micro powder, and the mass ratio is 0.8: 1;
the adhesive consists of cobalt neodecanoate and Ricobond1756 (maleated polybutadiene resin) in a mass ratio of 1: 1;
the protective auxiliary agent consists of antioxidant 4, 4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine and microcrystalline wax in a mass ratio of 1.5: 1;
the flame retardant consists of chlorinated paraffin, aluminum hydroxide and ammonium polyphosphate in a mass ratio of 5:3: 3;
the vulcanization accelerator consists of zinc dimethacrylate and HVA-2 (PDM) in a mass ratio of 5: 1;
the iodine absorption value of the high-activity magnesium oxide is 180mgI2/gMgO。
The preparation method of the pre-dispersed cellulose fiber comprises the following steps:
(1) surface treatment of cellulose fibers
Putting 97.5 wt% of bleached hardwood cellulose fibers and 2.5 wt% of surface treatment agent ethyl titanate into a high-speed mixer, discharging the materials into a low-speed mixer to be cooled when the temperature of the mixed materials reaches 103 ℃, obtaining the surface treated cellulose fibers when the temperature reaches 43 ℃, metering and packaging the materials, and standing for later use.
(2) Banburying and mixing of cellulose fiber
Putting 70 weight percent of surface treated cellulose fiber, 1 weight percent of dispersant oxidized polyethylene wax and 29 weight percent of polymer carrier ethylene propylene diene monomer rubber into an internal mixer, heating, conveying the uniformly internally mixed materials into a single-screw extruder for granulation through a lifter when the temperature of the mixed materials reaches 118 ℃, and controlling the temperature of three sections of single screw and a machine head as follows: the temperature of the first section is 50-55 ℃, the temperature of the second section is 60-65 ℃, the temperature of the third section is 70-75 ℃, and the temperature of the machine head is 40-45 ℃ to obtain granular pre-dispersed cellulose fibers.
In this example, the chlorosulfonated polyethylene rubber contained 35% by weight of chlorine and 1.2% by weight of sulfur.
The preparation method of the covering glue comprises the following steps:
(1) first-stage mixing: chlorosulfonated polyethylene rubber, EVM (Levamelt 456), high-activity magnesium oxide, a plasticizer, a wear-resistant reinforcing agent, carbon black (N330), graphite powder, an adhesive, rosin, pre-dispersed cellulose fibers, a protective aid, a JL-XS rubber antistatic agent, an anti-aging agent 4, 4' -diphenyl isopropyl diphenylamine and a flame retardant are subjected to pressure mixing (the upper plug pressure is 0.7 MPa), when the temperature reaches 120 ℃, a mixed section of master batch is discharged to an open mill with the roller temperature of 50 ℃ for rubber returning and mixing for 3 minutes, then the master batch is pressed into a rubber strip suitable for processing on a tablet press, and the rubber strip is placed for 10 hours;
(2) and (3) second-stage mixing: and (2) pressurizing and mixing the first-stage mixed rubber strip mixed in the step (1), a vulcanization accelerator and a vulcanizing agent Luperox DC40P-SP (upper top bolt pressure is 0.7 MPa), discharging the mixed second-stage rubber to an open mill with a roller temperature of 50 ℃ when the temperature reaches 90 ℃, returning the rubber for mixing for 3 minutes, and pressing the rubber strip on a tablet press to obtain the rubber strip suitable for processing, namely the conveyor belt covering rubber.
Example 2: heat-aging-resistant conveyor belt covering rubber and preparation method thereof
The covering glue comprises the following components in parts by weight:
the plasticizer consists of Rhein Asolvan T and hydroxyl-terminated polybutadiene, and the mass ratio is 4: 3;
the wear-resistant reinforcing agent consists of wear-resistant ceramic powder and polytetrafluoroethylene micro powder in a mass ratio of 1.1: 1.7;
the adhesive consists of cobalt neodecanoate and SR307 (polybutadiene acrylate) in a mass ratio of 1: 1;
the protection auxiliary agent consists of an antioxidant 1076 and maleic anhydride grafted polyethylene wax, and the mass ratio is 1.7: 1.2;
the flame retardant consists of chlorinated paraffin, magnesium hydroxide and trioctyl phosphate in a mass ratio of 5:4: 3;
the vulcanization accelerator consists of zinc dimethacrylate and HVA-2 (PDM) in a mass ratio of 7: 2;
the fineness of the wear-resistant ceramic powder is 5000 meshes.
The iodine absorption value of the high-activity magnesium oxide is 182mgI2/gMgO；
The preparation method of the pre-dispersed cellulose fiber comprises the following steps:
(1) surface treatment of cellulose fibers
Putting bleached hardwood cellulose fiber with the weight percentage of 98.0 percent and surface treating agent ethyl titanate with the weight percentage of 2.0 percent into a high-speed mixer, discharging the materials into a low-speed mixer to be cooled when the temperature of the mixed materials reaches 105 ℃, obtaining the cellulose fiber with the surface treatment when the temperature reaches 45 ℃, metering and packaging the materials, and standing for later use.
(2) Banburying and mixing of cellulose fiber
Putting 72.0 wt% of surface treated cellulose fiber, 2.0 wt% of dispersant oxidized polyethylene wax and 26 wt% of polymer carrier ethylene propylene diene monomer rubber into an internal mixer, heating, conveying the uniformly internally mixed materials to a single-screw extruder for granulation through a lifting machine when the temperature of the mixed materials reaches 120 ℃, and controlling the temperature of three sections of a single screw and the temperature of a machine head as follows: the temperature of the first section is 50-55 ℃, the temperature of the second section is 60-65 ℃, the temperature of the third section is 70-75 ℃, and the temperature of the machine head is 40-45 ℃ to obtain granular pre-dispersed cellulose fibers.
In this example, the chlorosulfonated polyethylene rubber contained 40% by weight of chlorine and 1.3% by weight of sulfur.
The preparation method of the covering glue comprises the following steps:
(1) first-stage mixing: chlorosulfonated polyethylene rubber, EVM (Levamelt 456), high-activity magnesium oxide, a plasticizer, a wear-resistant reinforcing agent, carbon black (N330), graphite powder, an adhesive, rosin, pre-dispersed cellulose fibers, a protective assistant, a permanent antistatic agent, an anti-aging agent N- (p-toluenesulfonamide) -N' -phenyl p-phenylenediamine and a flame retardant are pressurized (the pressure of an upper top bolt is 0.7 MPa) and mixed, when the temperature reaches 122 ℃, a mixed section of master batch is discharged to an open mill with a roller temperature of 50 ℃ for back mixing for 4 minutes, then the mixed master batch is pressed into a rubber strip suitable for processing on a tablet press, and the rubber strip is placed for 12 hours;
(2) and (3) second-stage mixing: and (2) pressurizing the first-stage mixed rubber strip mixed in the step (1), a vulcanization accelerator and a vulcanizing agent Luperox DC40P-SP (upper plug pressure of 0.7 MPa) for mixing, discharging the mixed second-stage rubber to an open mill with a roller temperature of 50 ℃ when the temperature reaches 92 ℃, returning the rubber for mixing for 4 minutes, and pressing the rubber strip on a tablet press to obtain the rubber strip suitable for processing, namely the thermal-oxidative-aging-resistant conveyor belt covering rubber.
Example 3: heat-aging-resistant conveyor belt covering rubber and preparation method thereof
The covering glue comprises the following components in parts by weight:
the plasticizer consists of rhinepine 10 and hydroxyl-terminated polybutadiene, and the mass ratio is 1: 1;
the wear-resistant reinforcing agent consists of modified glass powder and polytetrafluoroethylene micro powder in a mass ratio of 1.7: 1.8;
the adhesive consists of Ricobond1756 (maleated polybutadiene resin) and SR307 (polybutadiene acrylate) in a mass ratio of 1: 1;
the protection auxiliary agent consists of an antioxidant 1076 and maleic anhydride grafted polyethylene wax, and the mass ratio is 1: 1;
the flame retardant consists of chlorinated paraffin, magnesium hydroxide and melamine polyphosphate in a mass ratio of 1:1: 1;
the vulcanization accelerator consists of zinc dimethacrylate and HVA-2 (PDM) in a mass ratio of 7: 2.2;
the fineness of the modified glass powder is 5000 meshes.
The preparation method of the pre-dispersed cellulose fiber comprises the following steps:
(1) surface treatment of cellulose fibers
Putting bleached hardwood cellulose fiber with the weight percentage of 98.5 percent and surface treating agent ethyl titanate with the weight percentage of 1.5 percent into a high-speed mixer, discharging the materials into a low-speed mixer to be cooled when the temperature of the mixed materials reaches 107 ℃, obtaining the cellulose fiber with the surface treatment when the temperature reaches 47 ℃, metering and packaging the materials, and standing for later use.
(2) Banburying and mixing of cellulose fiber
Placing 75 weight percent of surface treated cellulose fiber, 3 weight percent of dispersant oxidized polyethylene wax and 22 weight percent of polymer carrier ethylene propylene diene monomer rubber into an internal mixer, heating, conveying the uniformly internally mixed materials to a single-screw extruder for granulation through a lifter when the temperature of the mixed materials reaches 122 ℃, and controlling the temperature of three sections of single screw and a machine head as follows: the temperature of the first section is 50-55 ℃, the temperature of the second section is 60-65 ℃, the temperature of the third section is 70-75 ℃, and the temperature of the machine head is 40-45 ℃ to obtain granular pre-dispersed cellulose fibers.
In this example, the chlorosulfonated polyethylene rubber contained 30% by weight of chlorine and 1.5% by weight of sulfur.
The preparation method comprises the following steps:
(1) first-stage mixing: the preparation method comprises the following steps of (1) pressurizing and mixing chlorosulfonated polyethylene rubber, EVM (Levamelt 456), high-activity magnesium oxide, a plasticizer, a wear-resistant reinforcing agent, carbon black (N330), graphite powder, an adhesive, rosin, pre-dispersed cellulose fibers, a protective assistant, a permanent antistatic agent, an anti-aging agent octylated diphenylamine and a flame retardant (with the upper plug pressure of 0.7 MPa), discharging a mixed section of master batch to an open mill with the roller temperature of 50 ℃ when the temperature reaches 125 ℃, returning the mixed master batch to the mill for mixing for 5 minutes, pressing the mixed master batch to a rubber strip suitable for processing on a tablet press, and standing for 16 hours;
(2) and (3) second-stage mixing: and (2) pressurizing the first-stage mixed rubber strip mixed in the step (1), a vulcanization accelerator and a vulcanizing agent Luperox DC40P-SP (upper plug pressure of 0.7 MPa) for mixing, discharging the mixed second-stage rubber to an open mill with a roller temperature of 50 ℃ when the temperature reaches 95 ℃, returning the rubber for mixing for 5 minutes, and pressing the rubber strip on a tablet press to obtain the rubber strip suitable for processing, namely the thermal-oxidative-aging-resistant conveyor belt covering rubber.
In the invention, the rhinestone EPS is non-sulfur and chlorine cross-linked vegetable oil, and is produced by rhinestone chemical production;
the Rheinine Asolvan T is a mixture of sulfur-crosslinked castor oil and refined rapeseed oil, and is produced by Rhein chemistry;
the rhinestone 10 is sulfur-crosslinked refined rapeseed oil, and is produced by rhinestone chemical production;
the fused silica micro powder, the polytetrafluoroethylene micro powder, the wear-resistant ceramic powder and the modified glass powder are all produced by Caucang east China sea colorful mineral products Limited company;
the antistatic agent is produced by Shandong polymeric antistatic science and technology limited;
the manufacturer of the vulcanizing agent Luperox DC40P-SP is Saedoma chemical Co.
Said EVM (Levamelt 456), produced by Arrana-Neoideae.
Comparative example 1:
the conveyer belt covering rubber comprises the following components in parts by weight:
the plasticizer consists of dioctyl phthalate and trioctyl trimellitate in a mass ratio of 1: 1;
the reinforcing agent consists of white carbon black, super wear-resistant carbon black (N110) and carbon black (N330) in a mass ratio of 1.2: 1.5: 3;
the flame retardant consists of diethyl aluminum hypophosphite, zinc borate and melamine polyphosphate in a mass ratio of 5:1: 1;
the accelerator consists of an accelerator DPTT and an accelerator NOBS in a mass ratio of 3: 2.
In this example, the chlorosulfonated polyethylene rubber contained 35% by weight of chlorine and 1.2% by weight of sulfur.
The preparation method of the covering glue comprises the following steps:
(1) first-stage mixing: chlorosulfonated polyethylene rubber, high-activity magnesium oxide, dioctyl phthalate, trioctyl trimellitate, white carbon black, super wear-resistant carbon black (N110), carbon black (N330), graphite powder, cobalt naphthenate, rosin, an anti-aging agent 4010NA, polyethylene wax, diethyl aluminum hypophosphite, zinc borate, melamine polyphosphate, an accelerator DPTT, an accelerator NOBS and pentaerythritol are pressurized (the upper plug pressure is 0.7 MPa) and mixed, when the temperature reaches 125 ℃, a mixed section of master batch is discharged to an open mill with a roller temperature of 50 ℃ for glue returning and mixing for 5 minutes, then the master batch is pressed into a rubber strip suitable for processing on a tablet press, and the rubber strip is placed for 16 hours;
(2) and (3) second-stage mixing: and (2) pressurizing (the upper top bolt pressure is 0.7 MPa) and mixing the first-stage mixed rubber strip mixed in the step (1), zinc dimethacrylate, HVA-2 (PDM) and a vulcanizing agent Luperox DC40P-SP, discharging the mixed second-stage rubber to an open mill with a roller temperature of 50 ℃ when the temperature reaches 95 ℃, returning and mixing the rubber for 5 minutes, and pressing the rubber strip on a tablet press to obtain the rubber strip suitable for processing, namely the conveying belt covering rubber.
Comparative example 2: traditional conveyer belt covering rubber and preparation method thereof
The covering glue comprises the following components in parts by weight:
the preparation method of the covering glue comprises the following steps:
(1) first-stage mixing: pressurizing natural rubber, butadiene rubber, chloroprene rubber, magnesium oxide, chlorinated paraffin, antimony trioxide, carbon black (N330), rosin, an anti-aging agent RD, cobalt boroacylate and graphite powder (the pressure of an upper top bolt is 0.7 MPa), mixing, discharging a mixed section of master batch to an open mill with a roller temperature of 50 ℃ for mixing for 3 minutes when the temperature reaches 115 ℃, pressing the mixed master batch to form an adhesive tape suitable for processing on a tablet press, and standing for 12 hours;
(2) and (3) second-stage mixing: and (2) pressurizing the first-stage mixed rubber strip mixed in the step (1), zinc oxide and sulfur (the upper plug pressure is 0.7 MPa), mixing, discharging the mixed second-stage rubber to an open mill with a roller temperature of 50 ℃ when the temperature reaches 90 ℃, returning the rubber for mixing for 5 minutes, and pressing the rubber strip on a tablet press to form the rubber strip suitable for processing.
The first to third heat aging resistant antistatic abrasion resistant flame retardant conveyor belt cover rubber of the examples is compared with the first to second performance tests of the comparative examples, and the test results are shown in table 1.
TABLE 1 comparison of conveyor Belt cover rubber Performance
As can be seen from table 1: compared with the conveyor belt covering rubber prepared in the comparative examples 1-2, the heat-aging-resistant antistatic wear-resistant flame-retardant conveyor belt covering rubber prepared in the examples 1-3 has very outstanding heat resistance, and particularly, the tensile strength, the adhesive strength and the abrasion loss after an aging test still meet the standard requirements, namely, the conveyor belt covering rubber still has good comprehensive properties of mechanics, antistatic property, wear resistance, adhesion and the like in a hot or high-temperature environment, and can prolong the service life of a flame-retardant conveyor belt.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (7)
1. The utility model provides a thermal ageing resistant conveyer belt cover is glued which characterized in that: the covering glue comprises the following components in parts by weight:
the adhesive is a combination of any two of cobalt neodecanoate, maleated polybutadiene resin and polybutadiene acrylate, and the mass ratio is 1: 1;
the type of the maleated polybutadiene resin is Ricobond 1756;
the polybutadiene acrylate is SR 307;
the vulcanizing agent is Luperox DC 40P-SP;
the vulcanization accelerator consists of zinc dimethacrylate and HVA-2 (PDM) in a mass ratio of (5-7): (1-2.2);
the plasticizer consists of a Rheinine series plasticizer and hydroxyl-terminated polybutadiene, and the mass ratio of the Rheinine series plasticizer to the hydroxyl-terminated polybutadiene is (1-4): (1-3);
the rhinestone series plasticizer is one of rhinestone EPS, rhinestone Asolvan T and rhinestone 10;
the wear-resistant reinforcing agent consists of silicon-containing micro powder and polytetrafluoroethylene micro powder in a mass ratio of (0.8-1.7): (1-1.8);
the silicon-containing micro powder is one of fused silicon micro powder, wear-resistant ceramic powder and modified glass powder;
the protective auxiliary agent consists of an antioxidant and solid wax, and the mass ratio of the antioxidant to the solid wax is (1-1.7): (1-1.2);
the antioxidant is 4, 4' -bis (alpha, alpha-dimethylbenzyl) diphenylamine or an antioxidant 1076;
the solid wax is microcrystalline wax or maleic anhydride grafted polyethylene wax.
2. The conveyor belt cover rubber against thermal aging according to claim 1, wherein: the chlorosulfonated polyethylene rubber contains 30-40% by weight of chlorine and 1.2-1.5% by weight of sulfur; the model of the EVM is Levamelt 456; the type of the carbon black is N330.
3. The conveyor belt cover rubber against thermal aging according to claim 1, wherein: the high-activity magnesium oxide has an iodine absorption value of 180-185mgI2/gMgO。
4. The conveyor belt cover rubber against thermal aging according to claim 1, wherein: the antistatic agent is a JL-XS rubber antistatic agent or a JL long-acting antistatic agent.
5. The conveyor belt cover rubber against thermal aging according to claim 1, wherein: the anti-aging agent is one of 4, 4 '-diphenyl isopropyl diphenylamine, N- (p-toluenesulfonamido) -N' -phenyl p-phenylenediamine and octylated diphenylamine.
6. The conveyor belt cover rubber against thermal aging according to claim 1, wherein: the flame retardant consists of chlorinated paraffin, hydroxide and a phosphorus-containing flame retardant in a mass ratio of (1-5): (1-4): (1-3);
the hydroxide is aluminum hydroxide or magnesium hydroxide;
the phosphorus-containing flame retardant is one of ammonium polyphosphate, trioctyl phosphate and melamine polyphosphate.
7. The preparation method of the heat aging resistant conveyor belt covering rubber as recited in claim 1, characterized in that: the method comprises the following steps:
(1) first-stage mixing: pressurizing chlorosulfonated polyethylene rubber, EVM, high-activity magnesium oxide, a plasticizer, a wear-resistant reinforcing agent, carbon black, graphite powder, an adhesive, rosin, pre-dispersed cellulose fibers, a protective aid, an antistatic agent, an anti-aging agent and a flame retardant to 0.7MPa for mixing, discharging a mixed section of master batch to an open mill with a roller temperature of 50 ℃ for mixing for 3-5 minutes when the temperature reaches 120-125 ℃, pressing into a rubber strip suitable for processing, and standing for 10-16 hours to obtain a section of mixing rubber strip;
(2) and (3) second-stage mixing: and (2) adding a vulcanization accelerator and a vulcanizing agent into the first-stage mixing rubber strip obtained in the step (1) to pressurize to 0.7MPa for mixing, discharging the mixed second-stage rubber to an open mill with a roller temperature of 50 ℃ to return to mix for 3-5 minutes when the temperature reaches 90-95 ℃, and pressing into a rubber strip suitable for processing to obtain the conveyer belt covering rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210205400.0A CN114316454B (en) | 2022-03-04 | 2022-03-04 | Heat-aging-resistant conveyor belt covering rubber and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009110534A1 (en) * | 2008-03-07 | 2009-09-11 | 株式会社ブリヂストン | Rubber composition for conveyor belt and conveyor belt |
| JP2011057375A (en) * | 2009-09-10 | 2011-03-24 | Bridgestone Corp | Rubber composition for conveyor belt and conveyor belt |
| CN103756223A (en) * | 2013-12-31 | 2014-04-30 | 杭州顺豪橡胶工程有限公司 | High temperature resisting halogen-free flame retardant conveyer belt covering adhesive and preparation method thereof |
| CN105331000A (en) * | 2015-11-17 | 2016-02-17 | 山东祥通橡塑集团有限公司 | Cover rubber for high-abrasion-resistance flame-retardant steel wire rope core conveying belt and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009110534A1 (en) * | 2008-03-07 | 2009-09-11 | 株式会社ブリヂストン | Rubber composition for conveyor belt and conveyor belt |
| JP2011057375A (en) * | 2009-09-10 | 2011-03-24 | Bridgestone Corp | Rubber composition for conveyor belt and conveyor belt |
| CN103756223A (en) * | 2013-12-31 | 2014-04-30 | 杭州顺豪橡胶工程有限公司 | High temperature resisting halogen-free flame retardant conveyer belt covering adhesive and preparation method thereof |
| CN105331000A (en) * | 2015-11-17 | 2016-02-17 | 山东祥通橡塑集团有限公司 | Cover rubber for high-abrasion-resistance flame-retardant steel wire rope core conveying belt and preparation method thereof |
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| CN114316454B (en) | 2022-06-10 |
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Denomination of invention: A heat-resistant aging conveyor belt covering adhesive and its preparation method Effective date of registration: 20230301 Granted publication date: 20220610 Pledgee: Postal Savings Bank of China Limited by Share Ltd. Weifang branch Pledgor: WEIFANG POLYGRAND CHEMICAL CO.,LTD. Registration number: Y2023980033789 |