CN115386153A - PVG conveyer belt cover glue and PVG conveyer belt - Google Patents

PVG conveyer belt cover glue and PVG conveyer belt Download PDF

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CN115386153A
CN115386153A CN202211266646.5A CN202211266646A CN115386153A CN 115386153 A CN115386153 A CN 115386153A CN 202211266646 A CN202211266646 A CN 202211266646A CN 115386153 A CN115386153 A CN 115386153A
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rubber
parts
weight
conveyer belt
pvg
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汪光亮
许文波
孙浩
张体阳
李丽
张鹏飞
于荣菲
陈焰林
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Shandong Xinbaolong Industrial Technology Co ltd
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Shandong Xinbaolong Industrial Technology Co ltd
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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
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02—Copolymers with acrylonitrile
    • 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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08L27/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/222—Magnesia, i.e. magnesium oxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/387—Borates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Belt Conveyors (AREA)

Abstract

The invention provides a PVG conveyer belt covering glue, which comprises: nitrile butadiene rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, a vulcanizing agent, an activating agent, an anti-aging agent, a reinforcing agent, a plasticizer and an accelerator. The application also provides a preparation method and application of the PVG conveyer belt covering rubber. The application provides a cover rubber is through adopting nitrile rubber and PVC resin as the main part sizing material to combine other auxiliaries, make PVG conveyer belt cover rubber have low carbon, high heat conduction and fire resistance, make the quick mill of cover rubber ability that thickness is more than 3mm break, solve the problem that high strength, thick lid glue PVG conveyer belt cylinder friction temperature easily exceed standard.

Description

PVG conveyer belt cover glue and PVG conveyer belt
Technical Field
The invention relates to the technical field of conveying belts, in particular to a PVG conveying belt covering adhesive and a PVG conveying belt.
Background
When a conveyor belt is used for transporting bulk materials, a roller is generally used for driving. The speed of the conveyor belt is normally the same as the linear speed of the roller surfaces and does not rub against each other to generate heat. However, under some special conditions, such as belt jamming or belt load starting, the running speed of the conveyor belt is lower than the linear speed of the surface of the roller, so that relative movement between the conveyor belt and the roller occurs, and friction generates heat, which has a potential impact on safety.
The flame-retardant PVG conveyer belt is mainly applied to underground coal mines and has very strict requirements on safety performance, and the requirements of MT/T914-2019 standard on the friction performance of a roller are as follows: when the flame-retardant belt is subjected to a roller friction test, the flame combustion and flameless combustion phenomena cannot occur at any part of the flame-retardant belt, and the surface temperature of the roller is not more than 325 ℃. When the formulation of the fire-retardant PVG conveyer belt covering rubber is designed, a large amount of fire retardant and a small amount of lubricant are generally added, so that the covering rubber is broken before the friction temperature of a roller does not reach 325 ℃. Under the conditions that the conveyor belt grade is below 1400S and the thickness of the covering rubber is within 2mm, the covering rubber can be broken within 10min generally, and the friction temperature of a roller is not more than 260 ℃.
With the development of modern large mines, the coal conveying amount of the conveying belt per hour is more and more, the requirement on the grade of the conveying belt is higher and higher, and the thickness of the covering rubber is thicker and thicker. The thicker the heat dissipation of covering glue is more difficult, and when thickness was greater than 3mm, rubber macromolecular material easily dehydrated into carbon under high temperature and fire retardant effect, and when carbon speed was greater than the wearing and tearing speed of covering glue, the covering glue surface formed the one deck stable, firm, lubricated carbon-layer, and the cylinder skidded on the conveyer belt surface can't the break-away area body. The conveyer belt is the bad conductor of heat, and when the produced heat of friction was greater than the system heat dissipation, the cylinder friction temperature can slowly rise, under the long-time continuous friction condition, has the potential risk that the friction temperature surpassed 325 ℃. In view of the above, the conventional cover rubber formula cannot meet the development requirements of the industry, and a low-carbon-formation high-thermal-conductivity flame-retardant formula needs to be designed, so that the cover rubber with the thickness of more than 3mm can be quickly ground off, and the industrial problem that the friction temperature of a roller of a thick-cover rubber PVG conveyor belt is easy to exceed the standard is solved.
Disclosure of Invention
The invention aims to provide PVG conveyer belt covering glue which has low carbon formation, high heat conduction and flame retardance, enables the covering glue with the thickness of more than 3mm to be quickly ground off, and solves the problem that the friction temperature of a thick covering glue PVG conveyer belt roller is easy to exceed the standard.
In view of the above, the present application provides a PVG conveyor belt cover rubber, including:
Figure BDA0003893565060000021
preferably, the plasticizer comprises a primary plasticizer and a secondary plasticizer, wherein the primary plasticizer is contained in an amount of 10 to 30 parts by weight, and the secondary plasticizer is contained in an amount of 5 to 15 parts by weight.
Preferably, the primary plasticizer is selected from dimethyl phthalate dioctyl acid, and the secondary plasticizer is selected from 52# chlorinated paraffin.
Preferably, the anti-aging agent comprises 1 to 3 parts by weight of anti-aging agent 4010NA, 1 to 3 parts by weight of microcrystalline wax and 1 to 3 parts by weight of calcium zinc stabilizer.
Preferably, the vulcanizing agent is selected from sulphur, the activator is selected from stearic acid, and the accelerator is selected from accelerator CZ.
Preferably, the content of the nitrile rubber is 45-60 parts by weight, the content of the PVC resin is 50-65 parts by weight, and the content of the magnesium oxide is 6-8 parts by weight.
Preferably, the content of the antimony trioxide is 5-8 parts by weight, the content of the 70# chlorinated paraffin is 30-35 parts by weight, the content of the aluminum hydroxide is 15-30 parts by weight, and the content of the chlorinated polyethylene is 3-8 parts by weight.
The application also provides a preparation method of the covering adhesive, which comprises the following steps:
mixing nitrile butadiene rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, a vulcanizing agent, an activating agent and an anti-aging agent for the first time according to the proportion to obtain a rubber compound;
adding a reinforcing agent and a plasticizer into the rubber compound, and discharging rubber for the first time to obtain a first section of rubber;
and standing the first-stage rubber, adding an accelerant, mixing, and discharging rubber for the second time to obtain the covering rubber.
Preferably, the temperature of the first glue discharging is 110-130 ℃, and the temperature of the second glue discharging is 100-110 ℃.
The application also provides a PVG conveyer belt, which consists of warps, wefts, a paste material and a cover rubber, and is characterized in that the cover rubber is the cover rubber or the cover rubber prepared by the preparation method.
The application provides PVG conveyer belt covering rubber, which is prepared by performing rubber-plastic blending modification on nitrile rubber and PVC resin, wherein the nitrile rubber provides better elasticity and wear resistance for a conveyer belt, the service life of the conveyer belt is prolonged, and the PVC resin begins to melt at the temperature of over 160 ℃ in the roller friction process, so that the covering rubber is quickly worn, the wear speed is higher than the carbon forming speed, a stable, firm and lubricating carbon layer is avoided being formed, and the industrial problem that the roller friction temperature of a high-strength thick-cover rubber PVG conveyer belt is easy to exceed the standard is solved; nanometer zinc oxide is used as a main heat conducting agent, the heat conductivity coefficient of the nanometer zinc oxide is about 20 times that of nitrile rubber, the heat dissipation speed of the belt body is improved, the temperature is prevented from being intensively and quickly raised at a friction point, the rising speed of the friction temperature of the roller is delayed, the potential risk that the temperature may exceed 325 ℃ in 1 hour in a roller friction test is solved, magnesium oxide is used as an auxiliary heat conducting agent, the adverse effect of the heat conducting agent on the physical performance of the covering rubber is reduced, and the tensile strength of the covering rubber is not less than 14Mpa. Therefore, the nitrile rubber and the PVC resin are used as the main rubber material of the covering rubber, so that the abrasion speed of the covering rubber is higher than the carbon forming speed, and a stable, firm and lubricating carbon layer is prevented from being formed; zinc oxide and magnesium oxide are used as heat conduction materials, so that the heat dissipation speed of the belt body is improved, the temperature is prevented from being concentrated and rapidly increased at a friction point, and the increase speed of the friction temperature of the roller is delayed; and through the cooperation of other additives, the obtained PVG conveyer belt covering rubber has low carbon formation, high heat conduction and flame retardance, so that the covering rubber with the thickness of more than 3mm can be quickly ground off, and the problem that the friction temperature of a thick-cover rubber PVG conveyer belt roller is easy to exceed the standard is solved.
Drawings
Fig. 1 is a cross-sectional view of a PVG conveyor belt according to the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In view of the problem that PVG conveyer belt cover rubber in the prior art can not give consideration to carbon formation, friction and heat conduction, the application provides PVG conveyer belt cover rubber, through designing nitrile rubber and PVC resin to carry out rubber-plastic blending as cover rubber main body rubber material, the wear rate of the cover rubber is faster than the carbon formation rate, and a stable, firm and lubricating carbon layer is avoided being formed; meanwhile, zinc oxide and magnesium oxide are used as heat conduction materials, so that the heat dissipation speed of the conveying belt is increased, the temperature is prevented from being concentrated and rapidly raised at a friction point, and the rising speed of the friction temperature of the roller is delayed. Specifically, the embodiment of the invention discloses a PVG conveyor belt covering rubber, which comprises the following components:
Figure BDA0003893565060000041
Figure BDA0003893565060000051
in the PVG conveyer belt covering rubber provided by the application, nitrile rubber and PVC resin are used as main rubber materials; the nitrile rubber provides good elasticity and wear resistance for the conveyer belt, the service life of the conveyer belt is prolonged, and the 3305 type nitrile rubber is preferably adopted and has high technological performance; PVC resin begins to melt at a temperature of above 160 ℃ in the process of roller friction, which is beneficial to the rapid abrasion of covering glue, ensures that the abrasion speed is higher than the carbon forming speed, avoids forming a stable, firm and lubricating carbon layer, and preferably adopts CPM-31 resin. The content of the nitrile rubber is 40-70 parts by weight, and specifically, the content of the nitrile rubber is 45-60 parts by weight. The content of the PVC resin is 40-70 parts by weight, and specifically, the content of the PVC resin is 45-60 parts by weight.
In the present application, the heat conducting system is composed of a main heat conducting agent and an auxiliary heat conducting agent; the nano zinc oxide is used as a main heat transfer agent, the heat conductivity coefficient of the nano zinc oxide is about 20 times that of nitrile rubber, the heat dissipation speed of the belt body is improved, the temperature is prevented from being concentrated and rapidly raised at a friction point, the rising speed of the friction temperature of the roller is delayed, and the potential risk that the temperature may exceed 325 ℃ in 1 hour in a roller friction test is solved; the magnesium oxide is used as an auxiliary heat conducting agent, the influence of the heat conducting agent on the physical properties of the covering rubber can be reduced through the combined use of the magnesium oxide and the auxiliary heat conducting agent, and the tensile strength of the covering rubber is not less than 14MPa. The content of the nano zinc oxide is 5-15 parts by weight, and specifically, the content of the nano zinc oxide is 8-12 parts by weight. The content of the magnesium oxide is 5-10 parts by weight, and concretely, the content of the magnesium oxide is 5-8 parts by weight.
Similarly, the flame retardant of the present application includes a primary flame retardant, a flame-retardant synergist and a secondary flame retardant. Wherein, antimony trioxide and 70# chlorinated paraffin are used as main flame retardants, so that the flaming combustion time after the alcohol blast burner is removed can be effectively reduced; the aluminum hydroxide and the zinc borate are used as flame-retardant synergists, the aluminum hydroxide releases crystal water when being heated and decomposed, the process is a strong endothermic reaction, a large amount of heat is absorbed, the function of cooling a polymer can be achieved, meanwhile, water vapor generated by the reaction can dilute combustible gas and inhibit the spread of combustion, the zinc borate is melted under the high-temperature condition to form a glassy state coating body, then dehydration is carried out, the steaming heat of water and the action of other water vapor are beneficial to smoldering self-extinguishing, and the flameless combustion time after the alcohol burner is removed can be reduced; chlorinated Polyethylene (CPE) is used as an auxiliary flame retardant, and is specifically selected from 135B chlorinated polyethylene, so that the problem of too low strength of the rubber compound caused by the large amount of PVC is solved, and the technological performance in the rubber mixing process is improved. The content of the antimony trioxide is 3-10 parts by weight, and in a specific embodiment, the content of the antimony trioxide is 5-8 parts by weight; the content of the 70# chlorinated paraffin is 20-40 parts by weight, and specifically, the content of the 70# chlorinated paraffin is 30-35 parts by weight; the content of the aluminum hydroxide is 10-40 parts by weight, specifically, the content of the aluminum hydroxide is 15-30 parts by weight; the content of the chlorinated polyethylene is 2-10 parts by weight, and specifically, the content of the chlorinated polyethylene is 3-8 parts by weight.
In the application, the plasticizer comprises a primary plasticizer and an auxiliary plasticizer, dimethyl phthalate dioctyl acid (DOP) is selected as the primary plasticizer, so that the plasticizer has a good plasticizing effect on PVC resin, the hardness of vulcanized rubber is effectively reduced, and the cold resistance is improved; and the 52# chlorinated paraffin is selected as an auxiliary plasticizer, so that the flame retardant function is achieved. The DOP content is 10-30 parts by weight, and specifically, the DOP content is 15-25 parts by weight; the content of the 52# chlorinated paraffin is 5-15 parts by weight, and specifically, the content of the 52# chlorinated paraffin is 8-12 parts by weight.
In the application, the vulcanizing agent preferably adopts sulfur, the accelerator preferably adopts sulfenamide CZ with longer scorching time, the scorching time of the covering rubber is prolonged, the discharge of air between the covering rubber and a belt blank in a forming process is facilitated, and the activator preferably adopts stearic acid. The vulcanizing agent content is 0.5-2 parts by weight, specifically 1.0-1.5 parts by weight; the content of the accelerator is 0.5-2 parts by weight, and concretely, the content of the accelerator is 0.8-1.5 parts by weight.
The reinforcing filling system is selected, so that the use of easily formed carbon and strong acid materials is required to be avoided, and N115 carbon black or N220 carbon black is preferably selected as the reinforcing filling system, so that the use parts of the carbon black are reduced as far as possible on the basis of ensuring the physical strength. The content of the reinforcing agent is 20-30 parts by weight, and specifically, the content of the reinforcing agent is 22-27 parts by weight.
The anti-aging system adopts a primary anti-aging agent and a secondary anti-aging agent. Wherein 4010NA and microcrystalline paraffin are selected as the main anti-aging agent, and 4010NA has excellent thermal oxidation aging resistance, ozone aging resistance and flex crack resistance; the microcrystalline paraffin can form a layer of protective film on the surface of the covering glue to isolate the erosion of oxygen and ozone in the air; the auxiliary anti-aging agent adopts a calcium-zinc stabilizer, prevents the PVC resin from being decomposed in the processing and using processes, and ensures the normal operation of the processing and using processes. The anti-aging agent 4010NA content is 1-3 parts by weight, the microcrystalline paraffin content is 1-3 parts by weight, and the calcium-zinc stabilizer content is 1-3 parts by weight.
In the PVG conveyer belt cover rubber provided by the application, carbon formation (main rubber) and heat conduction (heat conduction system) have a synergistic effect, and the carbon formation condition needs a carbon source (provided by the main rubber), an acid source (provided by a flame retardant system) and high temperature (provided by roller friction), wherein the carbon source is provided by the main rubber, namely nitrile butadiene rubber and PVC resin, and the high temperature is provided by the roller friction; after the heat-conducting agent is added, the heat-radiating capacity becomes strong, the temperature rising speed becomes slow, and the carbon forming speed becomes slow, so that under the condition, the material on the surface of the sample can be continuously ground off in the roller friction process, a firm, stable and lubricating carbon layer can not be formed on the surface of the sample, the sample can be smoothly ground off, and the roller friction temperature can not exceed the standard; therefore, the main sizing material and the heat-conducting agent realize synergistic interaction. Furthermore, the carbon source provider nitrile rubber and the PVC resin have a cooperative relationship, the nitrile rubber can be vulcanized to form a cross-linked network and is a thermosetting material, the PVC resin is plastic and cannot be vulcanized, and the fluidity at high temperature is increased. Therefore, the higher the content of the nitrile rubber, the more easily the carbon formation, and the higher the content of the PVC resin, the less easily the carbon formation.
The flame retardant system generally has two categories, namely a chlorine system and an antimony system which are used together to realize flame retardance (two paths of isolating oxygen and cooling), and a substance (zinc borate) capable of generating an acidic material under a high-temperature condition, wherein acid can dehydrate the carbon-based material, is beneficial to carbon formation and is not beneficial to the grinding-off of a roller. However, the amount of the flame retardant is controlled because the amount of the produced water contributes to the reduction of the flameless combustion time (the flameless combustion time without adding is liable to be exceeded).
Phosphate esters are avoided to be selected for a plasticizing system, because the phosphate esters can be dehydrated to form carbon, the carbon formation is facilitated, the roller is not easy to break, and the chlorine-containing 52# chlorinated paraffin is selected to be flame retardant and plasticizing.
The application also provides a preparation method of the covering glue, which comprises the following steps:
mixing nitrile butadiene rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, a vulcanizing agent, an activating agent and an anti-aging agent for the first time according to the proportion to obtain a rubber compound;
adding a reinforcing agent and a plasticizer into the rubber compound, and discharging rubber for the first time to obtain a section of rubber;
and standing the first-stage rubber, adding an accelerant, mixing, and discharging rubber for the second time to obtain the covering rubber.
More specifically, the preparation method of the covering glue specifically comprises the following steps:
setting the rotating speed of an internal mixer to be 20-40 r/min, putting nitrile rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, sulfur, stearic acid, an anti-aging agent 4010NA, microcrystalline wax and a calcium-zinc stabilizer into the internal mixer for mixing for 30-90 s, then adding carbon black, 52# chlorinated paraffin and DOP, controlling the temperature to be 110-130 ℃ for rubber discharge, and preparing a section of rubber; and after the first-stage rubber is parked for 8 hours, putting into an internal mixer, adding an accelerant CZ, mixing to 100-110 ℃, controlling the temperature, discharging rubber, and parking for 8 hours to obtain the covering rubber.
The application also provides a PVG conveyer belt, which consists of warp, weft, paste and covering glue, and particularly as shown in figure 1, the covering glue is the covering glue in the scheme.
In order to further understand the present invention, the PVG conveyor belt cover rubber provided by the present invention is specifically described below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
The formula of the low-carbon-formation high-heat-conduction flame-retardant PVG conveyor belt cover rubber comprises the following components in parts by weight: 60 parts of nitrile butadiene rubber, 40 parts of PVC resin, 15 parts of nano zinc oxide, 5 parts of magnesium oxide, 5 parts of antimony trioxide, 35 parts of 70# chlorinated paraffin, 15 parts of aluminum hydroxide, 5 parts of zinc borate, 2 parts of chlorinated polyethylene, 1 part of sulfur, 1 part of stearic acid, 1.5 parts of anti-aging agent 4010NA, 1 part of microcrystalline paraffin, 1 part of calcium-zinc stabilizer, 22 parts of carbon black, 5 parts of 52# chlorinated paraffin, 20 parts of DOP and 1 part of accelerator CZ;
putting nitrile butadiene rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, sulfur, stearic acid, antioxidant 4010NA, microcrystalline wax and calcium-zinc stabilizer into an internal mixer, mixing for 60S, then adding carbon black, 52# chlorinated paraffin and DOP, and discharging rubber at 125 ℃ to prepare a first-stage rubber; placing the first-stage rubber for 8 hours, adding an accelerant CZ into an internal mixer, mixing to 100 ℃, controlling temperature, discharging rubber, placing for 8 hours, and entering the next procedure.
The performance indexes of the cover rubber for the conveyer belt prepared in example 1 are shown in table 1 (grade 2000S for conveyer belt, thickness of cover rubber 3.5mm + 3.5mm):
table 1 table of properties of capstock prepared in example 1
Detecting items Unit MT/T914-2019 index requirement Test results
Tensile strength MPa ≥10.0 16.6
Elongation at break ％ ≥350 490
Amount of wear mm 3 ≤200 153
Friction performance of roller ℃ ≤325 286
As can be seen from the table 1, the formula of the embodiment 1 has good physical and heat-conducting properties, is suitable for PVG conveyer belts with the thickness of the covering rubber of 3-4 mm, and can ensure that the covering rubber is broken within 12 minutes in a roller friction test.
The prepared roller friction performance indexes of the conveying belt sample are as follows (conveying belt grade 2000S, covering glue thickness 3.5mm + 3.5mm):
table 2 table of friction performance data of blanket cylinders prepared in example 1
Detecting items Unit MT/T914-2019 index requirement Test knotFruit (A. A. B. D. B
Maximum temperature of roller friction ℃ ≤325 286
Time to wear-off min ≤60 10
As can be seen from Table 2, under the condition of adopting the heat conduction system, a sample of the conveyer belt grade 2000S (the thickness of the covering glue is 3.5mm + 3.5mm) can be quickly ground off, and the maximum temperature required by the standard of the maximum temperature of roller friction is still a certain margin.
Example 2
The formula of the low-carbon-formation high-heat-conduction flame-retardant PVG conveyor belt cover rubber comprises the following components in parts by weight: 50 parts of nitrile butadiene rubber, 50 parts of PVC resin, 10 parts of nano zinc oxide, 5 parts of magnesium oxide, 3 parts of antimony trioxide, 30 parts of 70# chlorinated paraffin, 20 parts of aluminum hydroxide, 5 parts of zinc borate, 3 parts of chlorinated polyethylene, 0.8 part of sulfur, 1 part of stearic acid, 1.5 parts of anti-aging agent 4010NA, 1 part of microcrystalline paraffin, 2 parts of calcium-zinc stabilizer, 22 parts of carbon black, 10 parts of 52# chlorinated paraffin, 20 parts of DOP and 0.7 part of accelerator CZ.
Nitrile butadiene rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, sulfur, stearic acid, an anti-aging agent 4010NA, microcrystalline wax and a calcium-zinc stabilizer are put into an internal mixer for mixing for 50S, then carbon black, 52# chlorinated paraffin and DOP are added, and the temperature is controlled at 120 ℃ for rubber discharge to prepare a first-stage rubber; placing the first-stage rubber for 8 hours, adding an accelerant CZ into an internal mixer, mixing to 100 ℃, controlling temperature, discharging rubber, placing for 8 hours, and entering the next procedure.
The performance indexes of the conveyer belt cover rubber prepared in example 2 are shown in table 3 (conveyer belt grade 2000S, cover rubber thickness 4.5mm + 4.5mm):
table 3 table of properties of coverlays prepared in example 2
Detecting items Unit of MT/T914-2019 index requirement Test results
Tensile strength MPa ≥10.0 15.1
Elongation at Break ％ ≥350 498
Amount of wear mm 3 ≤200 166
Friction performance of roller ℃ ≤325 272
As can be seen from Table 3, the formulation of example 2 has low carbon formation and moderate physical properties, is suitable for PVG conveyor belts with the thickness of the covering rubber of 4-5 mm, and can ensure that the roller friction test can be carried out, and the covering rubber is broken within 8 minutes.
Example 3
The formula of the low-carbon-formation high-heat-conduction flame-retardant PVG conveyor belt covering rubber comprises the following components in parts by weight: nitrile butadiene rubber 45, PVC resin 55, nano zinc oxide 8, magnesium oxide 5, antimony trioxide 3, 70# chlorinated paraffin 30, aluminum hydroxide 20, zinc borate 5, chlorinated polyethylene 5, sulfur 0.8, stearic acid 1, anti-aging agent 4010NA 1.5, microcrystalline paraffin 1, calcium-zinc stabilizer 2.5, carbon black 22, 52# chlorinated paraffin 5, DOP 23 and accelerator CZ 0.7.
Nitrile butadiene rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, sulfur, stearic acid, an anti-aging agent 4010NA, microcrystalline wax and a calcium-zinc stabilizer are put into an internal mixer for mixing for 40S, then carbon black, 52# chlorinated paraffin and DOP are added, and the temperature is controlled at 115 ℃ for rubber discharge to prepare a first-stage rubber; placing the first-stage rubber for 8 hours, adding an accelerant CZ into an internal mixer, mixing to 100 ℃, controlling temperature, discharging rubber, placing for 8 hours, and entering the next procedure.
The performance indexes of the conveyer belt cover rubber prepared in example 3 are shown in table 4 (conveyer belt grade 2000S, cover rubber thickness 5.5mm + 5.5mm):
table 4 table of properties of coverlays prepared in example 3
Detecting items Unit of MT/T914-2019 index requirement Test results
High tensile strengthDegree of rotation MPa ≥10.0 14.3
Elongation at break ％ ≥350 482
Amount of wear mm 3 ≤200 185
Friction performance of roller ℃ ≤325 262
As can be seen from Table 4, the formulation of example 3 has lower carbon forming performance and higher heat conducting performance, is suitable for PVG conveyer belts with the thickness of the covering rubber of 5-6 mm, and can ensure the roller friction test, and the covering rubber is broken within 5 minutes.
Comparative example 1
The same as in example 1, except that: when the thermal conductivity is 0, namely, zinc oxide is 0, and magnesium oxide is 0. The index of the friction performance of the prepared roller of the conveying belt sample is shown in Table 5 (conveying belt grade 2000S, covering glue thickness 3.5mm + 3.5mm):
TABLE 5 Table of friction performance data of blanket cylinders prepared in comparative example 1
Detecting items Unit of MT/T914-2019 index requirement Test results
Maximum temperature of roller friction ℃ ≤325 356
Time to wear-off min ≤60 Is constantly ground
As can be seen from Table 5, in the absence of a heat conduction system, a sample of conveyer belt grade 2000S (thickness of cover rubber 3.5mm + 3.5mm) cannot be ground off and the roller friction temperature exceeds the standard, and cannot meet the standard requirements.
Comparative example 2
The same as in example 1, except that: when the heat conducting system lacks zinc oxide, namely zinc oxide is 0 and magnesium oxide is 5. The index of the friction performance of the prepared roller of the conveying belt sample is shown in Table 6 (conveying belt grade 2000S, covering glue thickness 3.5mm + 3.5mm):
table 6 table of friction performance data of blanket cylinder prepared in comparative example 2
Figure BDA0003893565060000111
Figure BDA0003893565060000121
As can be seen from Table 6, under the condition of lacking the heat-conducting agent zinc oxide, the samples of the conveyer belt grade 2000S (the thickness of the covering rubber is 3.5mm + 3.5mm) are difficult to be ground off, the maximum friction temperature of the roller is close to the standard exceeding, and the surplus coefficient is not large.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A PVG carrier tape cover stock comprising:
Figure FDA0003893565050000011
2. the cover rubber according to claim 1, wherein the plasticizer comprises a primary plasticizer and a secondary plasticizer, the primary plasticizer is contained in an amount of 10 to 30 parts by weight, and the secondary plasticizer is contained in an amount of 5 to 15 parts by weight.
3. The coating compound of claim 2, wherein the primary plasticizer is dimethyl phthalate, and the secondary plasticizer is chlorinated paraffin 52 #.
4. The cover rubber according to claim 1 or 2, wherein the antioxidant comprises 1 to 3 parts by weight of antioxidant 4010NA, 1 to 3 parts by weight of microcrystalline wax and 1 to 3 parts by weight of calcium zinc stabilizer.
5. The skim coat of claim 4, wherein said vulcanizing agent is selected from sulfur, said activator is selected from stearic acid, and said accelerator is selected from accelerators CZ.
6. The cover rubber according to claim 5, wherein the content of the nitrile rubber is 45 to 60 parts by weight, the content of the PVC resin is 50 to 65 parts by weight, and the content of the magnesium oxide is 6 to 8 parts by weight.
7. The covering glue according to claim 5, wherein the antimony trioxide is in an amount of 5 to 8 parts by weight, the 70# chlorinated paraffin is in an amount of 30 to 35 parts by weight, the aluminum hydroxide is in an amount of 15 to 30 parts by weight, and the chlorinated polyethylene is in an amount of 3 to 8 parts by weight.
8. The method for preparing a cover paste according to any one of claims 1 to 7, comprising the steps of:
mixing nitrile butadiene rubber, PVC resin, nano zinc oxide, magnesium oxide, antimony trioxide, 70# chlorinated paraffin, aluminum hydroxide, zinc borate, chlorinated polyethylene, a vulcanizing agent, an activating agent and an anti-aging agent for the first time according to the proportion to obtain a rubber compound;
adding a reinforcing agent and a plasticizer into the rubber compound, and discharging rubber for the first time to obtain a first section of rubber;
and standing the first-stage rubber, adding an accelerant, mixing, and discharging rubber for the second time to obtain the covering rubber.
9. The preparation method of claim 8, wherein the temperature of the first rubber discharge is 110-130 ℃, and the temperature of the second rubber discharge is 100-110 ℃.
10. A PVG conveyor belt comprising warp, weft, paste and cover rubber, wherein the cover rubber is the cover rubber according to any one of claims 1 to 7 or the cover rubber produced by the production method according to any one of claims 8 to 9.
CN202211266646.5A 2022-10-17 2022-10-17 PVG conveyer belt cover glue and PVG conveyer belt Pending CN115386153A (en)

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