CN113072771B - Light conveying belt and preparation method thereof - Google Patents
Light conveying belt and preparation method thereof Download PDFInfo
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- CN113072771B CN113072771B CN202110306387.3A CN202110306387A CN113072771B CN 113072771 B CN113072771 B CN 113072771B CN 202110306387 A CN202110306387 A CN 202110306387A CN 113072771 B CN113072771 B CN 113072771B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The application relates to the field of conveyer belts, specifically discloses a light-duty conveyer belt, including aramid fiber canvas core, aramid fiber canvas core both sides have all coated the rubberizing layer, the rubberizing layer is formed by each raw materials preparation including following parts by weight: 80-90 parts of ethylene propylene diene monomer, 5-15 parts of nitrile rubber, 6-8 parts of sulfur, 5-7 parts of accelerator, 8-10 parts of anti-aging agent, 20-25 parts of supplementary filler, 1-3 parts of polymer grafted graphene, 15-17 parts of adhesive and 1.6-2.0 parts of stearic acid; it has the advantage of improving the heat resistance of the light conveyor belt; in addition, a preparation method of the light conveyer belt is also provided.
Description
Technical Field
The application relates to the field of conveyor belts, in particular to a light conveyor belt and a preparation method thereof.
Background
The conveyer belt is a composite product of rubber, fiber and metal or a composite product of plastic and fabric, which is used for bearing and conveying materials in belt transportation. The conveyer belt is widely applied to occasions with short conveying distance and small conveying amount in the industries of cement, metallurgy, food, chemical engineering and the like.
Among them, in the high temperature material industry such as steel mill, cement, etc., need to use heat-resisting conveyer belt, the advantage of heat-resisting conveyer belt is that can carry high temperature material, the shortcoming is that its area body is thick, from great, life is short. Rubber is a poor conductor of heat. The conventional heat-resistant conveyor belt has large thickness and insufficient heat conductivity, so that the service life of the conveyor belt is short.
Disclosure of Invention
In order to increase the heat resistance of the heat-resistant conveyor belt, a first object of the present application is to provide a lightweight conveyor belt.
A second object of the present application is to provide a method of manufacturing a lightweight conveyor belt.
The application provides a light-duty conveyer belt adopts following technical scheme:
the light conveying belt comprises an aramid canvas core, wherein two surfaces of the aramid canvas core are coated with adhesive layers, and the adhesive layers are prepared from the following raw materials in parts by weight: 80-90 parts of ethylene propylene diene monomer, 5-15 parts of nitrile rubber, 6-8 parts of sulfur, 5-7 parts of accelerator, 8-10 parts of anti-aging agent, 20-25 parts of supplementary filler, 1-3 parts of polymer grafted graphene, 15-17 parts of adhesive and 1.6-2.0 parts of stearic acid.
By adopting the technical scheme, the graphene has very good heat conduction performance, the heat conductivity coefficient of the graphene is higher, the graphene is a carbon material with the highest heat conductivity coefficient at present and is higher than that of a single-walled carbon nanotube and a multi-walled carbon nanotube, and the heat conductivity of the conveying belt can be greatly improved by adding the graphene in the adhesive tape layer, so that the service life of the conveying belt is prolonged; the graphene is one of the materials with the highest known strength, has good toughness and can be bent, and the mechanical properties such as tensile strength and the like of the conveying belt added with the graphene can be improved; this application can make the interval increase between the graphite alkene molecule through at graphite alkene surface graft polymer to difficult the reunion, and organic polymer can make the compatibility between graphite alkene and other raw materials of rubberizing layer better.
Preferably, monomers of the polymer in the polymer grafted graphene are glycidyl methacrylate, ethylene and propylene.
By adopting the technical scheme, the synthetic monomer of the ethylene propylene diene monomer contains a large amount of ethylene and propylene, and the compatibility of the polymer grafted graphene and the main raw material ethylene propylene diene monomer can be better by adding the monomers such as ethylene and propylene.
Preferably, the preparation steps of the polymer grafted graphene are as follows in parts by weight:
1) Adding 0.05-0.06 part of graphene oxide into 40-45 parts of DMF (dimethyl formamide), then adding 1-2 parts of glycidyl methacrylate, 3-4 parts of ethylene and 2-3 parts of propylene, stirring for 30-40min under the protection of nitrogen, then adding 0.03-0.04 part of initiator, heating to 65-70 ℃, and continuing stirring for reaction for 40-45h to obtain a mixed solution;
2) And carrying out solid-liquid separation on the mixed solution to obtain a precipitate, and washing and drying the precipitate to obtain the polymer grafted graphene.
By adopting the technical scheme, the monomer can be initiated to polymerize through the initiator, the monomers are proportioned, and the obtained polymer reacts with the graphene oxide through the action of hydrogen bonds to obtain the polymer grafted graphene oxide.
Preferably, the initiator in step 1) is azobisisobutyronitrile.
By adopting the technical scheme, the initiating effect of the azodiisobutyronitrile is better, and the polymerization reaction process is easier to control.
Preferably, the mixed solution is subjected to solid-liquid separation in the step 2) by centrifugation, wherein the rotation speed of the centrifugation is 3000-3500r/min, and the centrifugation time is 3-5min.
By adopting the technical scheme, the mixed solution can be quickly separated under the centrifugal condition, and the separation is complete.
Preferably, the anti-aging agent is caprolactam disulfide.
Preferably, the accelerator is N, N' -diphenyl-p-phenylenediamine.
Preferably, the supplementary filler is a mixture of zinc oxide and magnesium oxide, and the weight parts of the supplementary filler are as follows: magnesium oxide = 2.
By adopting the technical scheme, the composite stabilizer is prepared by mixing zinc oxide and magnesium oxide, and the proportion of the composite stabilizer is limited, so that the obtained adhesive layer has better performance
Preferably, the thickness of the adhesive layer is 5.0-5.5mm.
By adopting the technical scheme, the obtained conveying belt has good mechanical properties and good heat resistance under the condition that the adhesive layer is in the thickness range.
The application provides a preparation method of a light conveyer belt, which adopts the following technical scheme:
a preparation method of a light conveyor belt comprises the following preparation steps:
1) Primary plastication: plasticating the nitrile rubber at the rubber discharge temperature of 130-135 ℃ for 15-20min;
2) First-stage mixing: mixing the nitrile rubber and the ethylene propylene diene monomer rubber obtained in the step 1) for 5-8min, then adding an anti-aging agent, a supplementary filler, polymer grafted graphene and stearic acid, and continuously mixing for 4-6min at the mixing temperature of 130-135 ℃;
3) And (3) second-stage mixing: standing the mixture obtained in the step 2) for 4-5h, continuously heating for mixing, adding sulfur, an accelerator and an adhesive when the temperature reaches 85-90 ℃, continuously mixing for 4-6min, and discharging the rubber at 100-105 ℃ to obtain a rubber material;
4) And (3) conveying the rubber material obtained in the step 3) to a calender for cloth pasting through hot refining to obtain the light conveyer belt.
By adopting the technical scheme, through the control of the temperature, the time and the feeding sequence, the raw materials can be well mixed, so that the obtained conveying belt has uniform performance and good performance.
In summary, the present application has the following beneficial effects:
1. the graphene is added in the rubberizing layer, so that the heat conductivity of the conveying belt can be greatly improved, the service life of the conveying belt is prolonged, and the mechanical properties such as tensile strength and the like of the conveying belt added with the graphene can be improved; this application can make the interval increase between the graphite alkene molecule through at graphite alkene surface graft polymer to difficult the reunion, and organic polymer can make the compatibility between graphite alkene and other raw materials of rubberizing layer better.
2. The optimal different parameters of the conveyer belt prepared by the application are as follows: the interlayer bonding strength of the cloth is 6.8N/mm, the maximum value of the strength after aging is 77IRHD, the minimum value of the tensile strength after aging is 27.6MPa, the minimum value of the elongation at break after aging is 311 percent, the change rate of the hardness after aging is-9 percent, the change rate of the tensile strength after aging is-15 percent and the change rate of the elongation at break after aging is-34 percent, and the performances are excellent.
Detailed Description
The present application will be described in further detail with reference to examples.
Raw materials
Graphene oxide: prepared by hummers method;
accelerator (b): adopts the caprolactam disulfide, the manufacturer is Ningbo Examel New materials GmbH, the content is more than or equal to 97 percent;
an anti-aging agent: n, N' -diphenyl-p-phenylenediamine is adopted, and a manufacturer is New Material incubator, inc. of Tianyuan military thawing Industrial research institute;
adhesive: adopting a chloroprene phenol adhesive, and a manufacturer creates a material company for industrial materials under constant water.
Preparation examples
Preparation example 1
The polymer grafted graphene comprises the following specific steps:
1) Adding 0.06kg of graphene oxide into 40kg of DMF, then adding 1kg of glycidyl methacrylate, 4kg of ethylene and 2kg of propylene, stirring for 40min under the protection of nitrogen, then adding 0.03kg of initiator which is azobisisobutyronitrile, heating to 70 ℃, and continuing stirring for reacting for 40h to obtain a mixed solution;
2) And carrying out solid-liquid separation on the mixed solution by centrifugation, wherein the rotation speed of the centrifugation is 3500r/min, the centrifugation time is 3min, obtaining a precipitate, and washing and drying the precipitate to obtain the polymer grafted graphene.
Preparation example 2
The polymer grafted graphene comprises the following specific steps:
1) Adding 0.05kg of graphene oxide into 45kg of DMF (dimethyl formamide), then adding 2kg of glycidyl methacrylate, 3kg of ethylene and 3kg of propylene, stirring for 30min under the protection of nitrogen, then adding 0.04kg of initiator, heating the initiator to 65 ℃, and continuing stirring for reaction for 45h to obtain a mixed solution;
2) And (3) performing solid-liquid separation on the mixed solution through centrifugation, wherein the rotation speed of the centrifugation is 3000r/min, the centrifugation time is 5min, obtaining a precipitate, and washing and drying the precipitate to obtain the polymer grafted graphene.
Preparation example 3
The polymer grafted graphene comprises the following specific steps:
1) Adding 0.055kg of graphene oxide into 42kg of DMF, then adding 1.5kg of glycidyl methacrylate, 3.5kg of ethylene and 2.5kg of propylene, stirring for 35min under the protection of nitrogen, then adding 0.035kg of initiator which is azobisisobutyronitrile, heating to 68 ℃, and continuing to stir for reaction for 42h to obtain a mixed solution;
2) And carrying out solid-liquid separation on the mixed solution by centrifugation, wherein the rotation speed of the centrifugation is 3250r/min, the centrifugation time is 4min, obtaining a precipitate, and washing and drying the precipitate to obtain the polymer grafted graphene.
Examples
Examples 1 to 5
A light conveyer belt comprises an aramid canvas core, wherein two surfaces of the aramid canvas core are coated with adhesive layers, the raw materials and the using amounts of the raw materials of the adhesive layers are shown in a table 1, the thickness of each adhesive layer is 5.0mm, and the preparation method comprises the following steps:
1) Primary plastication: plasticating the nitrile rubber at the rubber discharge temperature of 130 ℃ for 20min;
2) First-stage mixing: mixing the nitrile rubber and the ethylene propylene diene monomer rubber obtained in the step 1) for 5min, then adding an anti-aging agent, a supplementary filler, polymer grafted graphene and stearic acid, and continuously mixing for 6min at the mixing temperature of 130 ℃;
3) And (2) two-stage mixing: standing the mixture obtained in the step 2) for 5h, continuously heating for mixing, adding sulfur, an accelerator and an adhesive when the temperature reaches 85 ℃, continuously mixing for 6min, and discharging the rubber at 100 ℃ to obtain a rubber material;
4) And (3) conveying the rubber material obtained in the step 3) to a calender for cloth pasting through hot refining to obtain the light conveyer belt.
The polymer grafted graphene is prepared from preparation example 1, and the supplementary filler is a mixture of zinc oxide and magnesium oxide, wherein the weight parts of the supplementary filler are as follows: magnesium oxide = 2.
TABLE 1 materials and amounts (kg) of materials for the belts of examples 1-5
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Ethylene propylene diene monomer | 80 | 83 | 85 | 88 | 90 |
| Nitrile rubber | 15 | 13 | 10 | 7 | 5 |
| Sulfur | 6 | 6.5 | 7 | 7.5 | 8 |
| Accelerator | 7 | 6.5 | 6 | 5.5 | 5 |
| Anti-aging agent | 8 | 8.5 | 9 | 9.5 | 10 |
| Supplementary filler | 25 | 24 | 23 | 21 | 20 |
| Polymer grafted graphene | 1 | 1.5 | 2 | 2.5 | 3 |
| Adhesive agent | 17 | 16.5 | 16 | 15.5 | 15 |
| Stearic acid | 1.6 | 1.7 | 1.8 | 1.9 | 2.0 |
Examples 6 to 9
The lightweight conveyor belts of examples 6 to 9 were different from example 4 in that the polymer-grafted graphene was added to the rubber layer in the amounts of 1kg, 1.5kg, 2kg and 3kg in this order, and the polymer-grafted graphene was obtained from preparation example 1, and the rest of the procedure was the same as in example 4.
Example 10
The lightweight conveyor belt of example 10 differs from example 4 in that the polymer grafted graphene is from preparative example 2, and the remaining steps are the same as in example 4.
Example 11
The light weight conveyor belt of example 11 differs from example 4 in that the polymer grafted graphene was from preparation example 3, and the remaining steps were the same as in example 4.
Example 12
The lightweight conveyor belt of example 12 differs from example 4 in that the thickness of the rubberizing layer was 5.5mm, and the rest of the procedure was the same as example 4.
Example 13
A lightweight conveyor belt, differing from example 4 in the method of preparation, as follows:
1) Primary plastication: plasticating the nitrile rubber at the rubber discharge temperature of 135 ℃ for 15min;
2) First-stage mixing: mixing the nitrile rubber and the ethylene propylene diene monomer rubber obtained in the step 1) for 8min, then adding an anti-aging agent, a supplementary filler, polymer grafted graphene and stearic acid, and continuously mixing for 4min at the mixing temperature of 135 ℃;
3) And (3) second-stage mixing: standing the mixture obtained in the step 2) for 4h, continuously heating for mixing, adding sulfur, an accelerant and an adhesive when the temperature reaches 90 ℃, continuously mixing for 4min, and discharging the glue at 105 ℃ to obtain a glue stock;
4) And (3) conveying the rubber material obtained in the step 3) to a calender for cloth pasting through hot refining to obtain the light conveyer belt.
Comparative example
Comparative example 1
The light conveyor belt is different from the conveyor belt in example 4 in that the addition amount of the polymer grafted graphene is 0, and the rest steps are the same as those in example 4.
Comparative example 2
A light conveyor belt, which is different from example 4 in that the polymer grafted graphene is replaced by the same weight part of graphene, and the rest steps are the same as example 4.
Performance test
Detection method
The prepared conveyor belts of examples 1-13 and comparative examples 1-2 were taken, and then tested according to the method of GB/T20021-2005, and the test results are shown in Table 2.
Wherein the aging temperature is 175 ℃ and the aging time is 96h.
Table 2 test results of the conveyor belts of examples 1 to 13 and comparative example 1
As can be seen from the detection data of Table 2, the light conveyer belt prepared by the method meets the national standard requirements, and meets the requirements of conventional use environments.
It can be seen from the test data of example 4 and examples 6-9 that, as the amount of the added polymer-grafted graphene increases gradually, the prepared conveyor belt shows an increasing trend in the maximum strength after aging, the minimum tensile elongation at break after aging, the hardness change rate after aging, the tensile strength change rate after aging, and the tensile elongation at break after aging, and the increasing trend is gradual.
As can be seen from the test data of example 4 and examples 10 to 11, the conveyer belts prepared by adding the polymer grafted graphene of preparation examples 1 to 3 have no obvious difference in performance.
It can be seen from the test data of examples 4 and 12 that as the thickness of the skim coat increased, the maximum post-aging strength, the minimum post-aging tensile strength, and the minimum post-aging tensile elongation all improved, but all increased the post-aging hardness change, post-aging tensile strength change, and post-aging tensile elongation.
It can be seen from the test data of example 4 and example 12 that when the process parameters are improved within a certain range, the performances of the obtained conveyer belt are not obviously different.
From the detection data of the example 4 and the comparative examples 1-2, the conveyor belt prepared by adding the polymer grafted graphene is excellent in various performances, and the conveyor belt added with the graphene has no obvious improvement on the hardness change rate after aging, the tensile strength change rate after aging and the elongation at break after aging due to the agglomeration phenomenon of the graphene in the conveyor belt.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (7)
1. The light conveying belt is characterized by comprising an aramid canvas core, wherein two surfaces of the aramid canvas core are coated with adhesive layers, and the adhesive layers are prepared from the following raw materials in parts by weight: 80-90 parts of ethylene propylene diene monomer, 5-15 parts of nitrile rubber, 6-8 parts of sulfur, 5-7 parts of accelerator, 8-10 parts of anti-aging agent, 20-25 parts of supplementary filler, 1-3 parts of polymer grafted graphene, 15-17 parts of adhesive and 1.6-2.0 parts of stearic acid; the supplementary filler is a mixture of zinc oxide and magnesium oxide, and the weight parts of the supplementary filler are as follows: magnesium oxide = 2;
monomers of a polymer in the polymer grafted graphene are glycidyl methacrylate, ethylene and propylene, and the preparation steps of the polymer grafted graphene are as follows according to parts by weight:
1) Adding 0.05-0.06 part of graphene oxide into 40-45 parts of DMF (dimethyl formamide), then adding 1-2 parts of glycidyl methacrylate, 3-4 parts of ethylene and 2-3 parts of propylene, stirring for 30-40min under the protection of nitrogen, then adding 0.03-0.04 part of initiator, heating to 65-70 ℃, and continuing stirring for reaction for 40-45h to obtain a mixed solution;
2) And carrying out solid-liquid separation on the mixed solution to obtain a precipitate, and washing and drying the precipitate to obtain the polymer grafted graphene.
2. A lightweight conveyor belt as in claim 1 wherein: the initiator in the step 1) is azobisisobutyronitrile.
3. A lightweight conveyor belt as in claim 1 wherein: and 2) carrying out solid-liquid separation on the mixed solution through centrifugation, wherein the rotation speed of the centrifugation is 3000-3500r/min, and the centrifugation time is 3-5min.
4. A lightweight conveyor belt as in claim 1 wherein: the anti-aging agent is caprolactam disulfide.
5. A lightweight conveyor belt as in claim 1 wherein: the accelerant is N, N' -diphenyl-p-phenylenediamine.
6. A lightweight conveyor belt as in claim 1 wherein: the thickness of the adhesive layer is 5.0-5.5mm.
7. A method of manufacturing a light weight conveyor belt as claimed in any one of claims 1 to 6, characterized in that: the preparation method comprises the following preparation steps:
1) Primary plastication: plasticating the nitrile rubber at the rubber discharge temperature of 130-135 ℃ for 15-20min;
2) First-stage mixing: mixing the nitrile rubber and the ethylene propylene diene monomer rubber obtained in the step 1) for 5-8min, then adding an anti-aging agent, a supplementary filler, polymer grafted graphene and stearic acid, and continuously mixing for 4-6min at the mixing temperature of 130-135 ℃;
3) And (3) second-stage mixing: standing the mixture obtained in the step 2) for 4-5h, continuously heating for mixing, adding sulfur, an accelerator and an adhesive when the temperature reaches 85-90 ℃, continuously mixing for 4-6min, and discharging the rubber at 100-105 ℃ to obtain rubber material;
4) And (3) conveying the rubber material obtained in the step 3) to a calender for cloth pasting through hot refining to obtain the light conveyer belt.
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| CN102040714B (en) * | 2010-11-02 | 2012-12-05 | 浙江大学 | Preparation method of polymer-grafted graphene |
| CN102167213B (en) * | 2011-05-23 | 2013-01-09 | 兖矿集团有限公司 | High-temperature-resistant conveyor belt |
| CN102604175B (en) * | 2012-02-23 | 2014-04-16 | 北京化工大学 | Method for preparing graphene oxide/white carbon black/rubber nanocomposite |
| JP6401551B2 (en) * | 2013-09-12 | 2018-10-10 | 積水化学工業株式会社 | Resin composite material and manufacturing method thereof |
| CN106010370A (en) * | 2016-07-06 | 2016-10-12 | 无锡宝通科技股份有限公司 | Canvas core thermal insulation conveying belt adhesive layer rubber material and preparation method thereof |
| CN109734973A (en) * | 2018-12-20 | 2019-05-10 | 青岛环球输送带有限公司 | A kind of high intensity oil resistant conveyer and its preparation process |
| CN110117396A (en) * | 2019-04-23 | 2019-08-13 | 烟台桑尼橡胶有限公司 | A kind of the high temperature-resistant acid-resistant alkali rubber strip formula and its preparation process of containing graphene |
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