CN111777849B - High-strength V-shaped rubber belt and preparation method thereof - Google Patents
High-strength V-shaped rubber belt and preparation method thereof Download PDFInfo
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- CN111777849B CN111777849B CN202010533442.8A CN202010533442A CN111777849B CN 111777849 B CN111777849 B CN 111777849B CN 202010533442 A CN202010533442 A CN 202010533442A CN 111777849 B CN111777849 B CN 111777849B
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Abstract
The invention relates to the field of rubber belts, in particular to a high-strength V-shaped rubber belt and a preparation method thereof. According to the invention, through surface modification of the carbon nano tube, lignin amine grafting is formed on the surface of the carbon nano tube, the compatibility of the carbon nano tube with a resin and a rubber system is obviously promoted, the performance of the rubber belt is obviously enhanced, the elasticity and tear resistance of the rubber belt are improved, and the rubber belt can be normally used in various environments.
Description
Technical Field
The invention relates to the field of rubber belts, in particular to a high-strength V-shaped rubber belt and a preparation method thereof.
Background
The V-shaped rubber belt is widely used in various fields, such as automobiles, machinery, and the like, and has large deformation and small rigidity, which become important factors that the application is limited. The V-shaped rubber belt is mainly made of natural rubber, chloroprene rubber and nitrile rubber which are respectively designed according to a formula taking the three materials as main bodies, and the V-shaped rubber belt is high in hardness, wherein the chloroprene rubber is high in tensile strength, superior to the natural rubber and the butyl rubber in heat resistance, light resistance, aging resistance and oil resistance, high in flame resistance and excellent in flame retardance, high in chemical stability and good in water resistance, but generally has the problem of poor anti-cracking effect. For example, the rubber composition for manufacturing the compression layer of the covered triangular belt with the patent number of CN201710505306.6 and the preparation method thereof are prepared by adopting natural rubber, styrene-butadiene rubber, eucommia rubber, a vulcanization activator, a lubricant, an anti-aging agent, carbon black, white carbon black, argil, calcium carbonate, a plasticizer, a tackifier, an accelerant and a vulcanizing agent, the flexural fatigue resistance and the heat resistance of the rubber composition are improved, the dynamic heat generation of the rubber composition is reduced, and the fatigue life of the rubber composition is further improved, but the used raw materials are not selected in a targeted manner, and the advantages of the raw materials cannot be exerted on the anti-cracking effect; as well as the high-hardness rubber with the patent number of CN201610636246.7 and the preparation method and the application thereof, the high-hardness rubber is prepared from styrene-butadiene rubber, nitrile-butadiene rubber, zinc oxide, stearic acid, an anti-aging agent, carbon black, a softening agent, factice, a flowing agent and an accelerating agent, the obtained high-hardness rubber effectively improves the overall performance of the product, and has better oil resistance, wear resistance and aging resistance, higher reliability and longer service life, but the performance of the rubber is not reduced because the rubber is not processed according to the molecular characteristics of raw materials in the preparation process. Therefore, it is necessary to manufacture a V-shaped rubber belt according to rubber characteristics and improve the performance thereof.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high-strength V-shaped rubber belt and a preparation method thereof, which are used for promoting the compatibility of raw materials and improving the performance parameters of the rubber belt, and the specific technical scheme is as follows:
the high-strength V-shaped rubber belt is prepared from the following components in parts by mass: 50-80 parts of polyurethane rubber, 10-20 parts of nitrile rubber, 15-25 parts of fluororubber, 30-50 parts of acrylate rubber, 10-20 parts of isoprene rubber, 2-5 parts of lubricating agent, 1-3 parts of dispersing agent, 30-50 parts of reinforcer, 10-15 parts of styrene-acrylonitrile copolymer and 0.8-1.5 parts of modified carbon nano tube; the modified carbon nano tube is prepared from a carboxyl carbon nano tube, dicyclohexylcarbodiimide and lignin amine in a mass ratio of 100-110:0.5: 3.
Further, the lubricant is polyethylene wax.
Further, the dispersing agent is microcrystalline paraffin.
Further, the enhancer is formed by mixing nano silicon dioxide, nano calcium sulfate and nano barium sulfate in a mass ratio of 0.5-1:0.8-1: 1-1.2;
the preparation method of the high-strength V-shaped rubber belt comprises the following steps:
(1) weighing the components according to the mass ratio, putting the carbon nano tube into a vacuum reactor, adjusting the vacuum degree to 3-5Pa, introducing inert gas for protection to ensure that the pressure of the reactor is 25-35Pa, heating the carbon nano tube to the temperature of 150 ℃ and keeping the temperature at 180 ℃ for 20-30min, then reducing the temperature to 45-55 ℃, introducing oxygen and ozone to ensure that the pressure in the reactor reaches 1.5-2 standard atmospheric pressures, reacting for 5-7h, and treating for 15-20min by microwave every 50-70 min; obtaining carboxyl carbon nano-tubes; the microwave power is 200-300W;
(2) uniformly mixing the carbon nano tube obtained in the last step with dicyclohexylcarbodiimide and lignin amine, heating to 80-90 ℃, preserving heat for 15-25min, then raising the temperature to 115-125 ℃, treating for 20-30min by using ultrasonic waves, reacting for 15-18h, washing and filtering by using ethanol to obtain a modified carbon nano tube;
(3) pressurizing and mixing polyurethane rubber, nitrile rubber, fluororubber, acrylate rubber and isoprene rubber to obtain a mixture A;
(4) heating and melting the styrene-acrylonitrile copolymer, adding the modified carbon nano tube, and uniformly mixing to obtain a mixture B;
(5) and adding the mixture B into the mixture A, mixing, adding the components such as the lubricant, the dispersant, the enhancer and the like, mixing, and pouring into a mold for compression molding.
Further, in the step (1), the mass ratio of the oxygen to the ozone is 23-25: 1.
The invention has the beneficial effects that:
according to the invention, the fluororubber is used, so that the rubber belt has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance, the high-temperature service performance of the rubber belt is improved while the excellent elasticity of the rubber belt is maintained, so that parameters such as elongation at break, hardness and the like of the rubber belt can be kept at an excellent level after the rubber belt is subjected to air heat aging resistance when the rubber belt is used at a high temperature for a long time, the elongation at break and the tear strength of the rubber belt are obviously improved, the air permeability of the rubber belt is weak, the permeation of external oxidation components when the rubber belt is subjected to local tearing is prevented, and the aging of the rubber belt in use is slowed down.
According to the invention, by utilizing the characteristic of better compatibility of the styrene-acrylonitrile copolymer and the modified carbon nano tube, the modified carbon nano tube is dissolved by the styrene-acrylonitrile copolymer and then is mixed with other components, so that the dispersion of the carbon nano tube is facilitated, the coagulation of the carbon nano tube and other raw materials is promoted, the dimensional stability and higher bearing capacity of the rubber belt are improved, the prepared rubber belt has good chemical stability, can resist water, oil, acid, alkali and alcohol, the performance parameters of the rubber belt under various use conditions are improved, and the use range of the rubber belt is enlarged.
According to the invention, the reinforcing agent prepared from nano silicon dioxide, nano calcium sulfate and nano barium sulfate is used, and different atomic scales and activities of silicon, calcium and barium are utilized, so that the nano silicon dioxide, the nano calcium sulfate and the nano barium sulfate are uniformly dispersed and tightly coagulated in a high molecular network of polyurethane rubber, nitrile rubber, fluororubber, acrylate rubber, isoprene rubber and styrene-acrylonitrile copolymer, the reinforcing of the modified carbon nano to the material is promoted, the ageing resistance, the strength and the chemical resistance of the rubber belt are improved, and the rubber belt can adapt to various use environments.
According to the invention, the carbon nano tube is preheated in vacuum, so that the release of impurity gas among the gaps of the carbon nano tube is promoted, the contact area of the carbon nano tube is increased, the modification of the surface of the carbon nano tube is promoted by introducing mixed gas of oxygen and ozone, the contact of the carbon nano tube with the oxygen and the ozone is promoted, and a large amount of carboxyl is formed on the surface of the carbon nano tube under the assistance of high temperature and microwave; and then, the condensation of dicyclohexylcarbodiimide is utilized to promote the reaction of carboxyl on the surface of the carbon nano tube and lignin amine, so that the grafting of the lignin amine is formed on the surface of the carbon nano tube, the compatibility of the carbon nano tube with a resin and a rubber system is remarkably promoted, the construction of a macromolecular network of the rubber belt is promoted by increasing active hydroxyl groups on the surface of carbon fibers, the performance of the rubber belt is remarkably enhanced, and the wear resistance and the flexibility of the rubber belt are improved.
The V-shaped rubber belt manufactured by the invention has the advantages of tensile strength higher than 17.31Mpa, elongation at break higher than 330.18%, compression permanent deformation lower than 22.46% at 100 ℃ for 22h, bending fatigue resistance times (six-level cracks) higher than 23835, excellent performance and good applicability.
Detailed Description
Example 1
The high-strength V-shaped rubber belt is prepared from the following components in parts by mass: 50 parts of polyurethane rubber, 10 parts of nitrile rubber, 15 parts of fluororubber, 30 parts of acrylate rubber, 10 parts of isoprene rubber, 2 parts of lubricant, 1 part of dispersant, 30 parts of reinforcer, 10 parts of styrene-acrylonitrile copolymer and 0.8 part of modified carbon nanotube; the modified carbon nano tube is prepared from a carboxyl carbon nano tube, dicyclohexylcarbodiimide and lignin amine in a mass ratio of 100:0.5: 3; the lubricant is polyethylene wax; the dispersing agent is microcrystalline paraffin; the enhancer is formed by mixing nano silicon dioxide, nano calcium sulfate and nano barium sulfate in a mass ratio of 0.5:0.8: 1;
the preparation method of the high-strength V-shaped rubber belt in the embodiment is as follows:
(1) weighing the components according to the mass ratio, putting the carbon nano tube into a vacuum reactor, adjusting the vacuum degree to be 3Pa, filling inert gas for protection to ensure that the pressure of the reactor is 25Pa, heating the carbon nano tube to the temperature of 150 ℃, preserving the temperature for 20min, then reducing the temperature to 45 ℃, filling oxygen and ozone to ensure that the pressure in the reactor reaches 1.5 standard atmospheric pressures, reacting for 5h, and treating for 150min by using microwaves every 50 min; obtaining carboxyl carbon nano-tubes; the mass ratio of the oxygen to the ozone is 23: 1; the microwave power is 200W;
(2) uniformly mixing the carbon nano tube obtained in the last step, dicyclohexylcarbodiimide and lignin amine, heating to 80 ℃, preserving heat for 15min, then raising the temperature to 115 ℃, treating for 20min by using ultrasonic waves, reacting for 15h, washing and filtering by using ethanol to obtain a modified carbon nano tube;
(3) pressurizing and mixing polyurethane rubber, nitrile rubber, fluororubber, acrylate rubber and isoprene rubber to obtain a mixture A;
(4) heating and melting the styrene-acrylonitrile copolymer, adding the modified carbon nano tube, and uniformly mixing to obtain a mixture B;
(5) and adding the mixture B into the mixture A, mixing, adding the components such as the lubricant, the dispersant, the enhancer and the like, mixing, and pouring into a mold for compression molding.
Example 2
The high-strength V-shaped rubber belt is prepared from the following components in parts by mass: 80 parts of polyurethane rubber, 20 parts of nitrile rubber, 25 parts of fluororubber, 50 parts of acrylate rubber, 20 parts of isoprene rubber, 5 parts of lubricant, 3 parts of dispersant, 50 parts of reinforcer, 15 parts of styrene-acrylonitrile copolymer and 1.5 parts of modified carbon nano tube; the modified carbon nano tube is prepared from a carboxyl carbon nano tube, dicyclohexylcarbodiimide and lignin amine in a mass ratio of 110:0.5: 3; the lubricant is polyethylene wax; the dispersing agent is microcrystalline paraffin; the enhancer is formed by mixing nano silicon dioxide, nano calcium sulfate and nano barium sulfate in a mass ratio of 1:1: 1.2;
the preparation method of the high-strength V-shaped rubber belt in the embodiment is as follows:
(1) weighing the components according to the mass ratio, putting the carbon nano tube into a vacuum reactor, adjusting the vacuum degree to be 5Pa, filling inert gas for protection, enabling the pressure of the reactor to be 35Pa, heating the carbon nano tube to the temperature of 180 ℃, preserving the temperature for 30min, then reducing the temperature to 55 ℃, filling oxygen and ozone, enabling the pressure in the reactor to reach 2 standard atmospheric pressures, reacting for 7h, and processing for 20min by microwave every 70 min; obtaining carboxyl carbon nano-tubes; the mass ratio of the oxygen to the ozone is 25: 1; the microwave power is 300W;
(2) uniformly mixing the carbon nano tube obtained in the last step, dicyclohexylcarbodiimide and lignin amine, heating to 90 ℃, preserving heat for 25min, then raising the temperature to 125 ℃, treating for 30min by using ultrasonic waves, reacting for 18h, washing and filtering by using ethanol to obtain a modified carbon nano tube; the mass ratio of the modified carbon nano tube to the dicyclohexylcarbodiimide to the lignin amine is 100:0.5: 3;
(3) pressurizing and mixing polyurethane rubber, nitrile rubber, fluororubber, acrylate rubber and isoprene rubber to obtain a mixture A;
(4) heating and melting the styrene-acrylonitrile copolymer, adding the modified carbon nano tube, and uniformly mixing to obtain a mixture B;
(5) and adding the mixture B into the mixture A, mixing, adding the components such as the lubricant, the dispersant, the enhancer and the like, mixing, and pouring into a mold for compression molding.
Example 3
The high-strength V-shaped rubber belt is prepared from the following components in parts by mass: 70 parts of polyurethane rubber, 17 parts of nitrile rubber, 19 parts of fluororubber, 50 parts of acrylate rubber, 10 parts of isoprene rubber, 5 parts of lubricant, 1 part of dispersant, 50 parts of reinforcer, 10 parts of styrene-acrylonitrile copolymer and 1.5 parts of modified carbon nano tube; the modified carbon nano tube is prepared from a carboxyl carbon nano tube, dicyclohexylcarbodiimide and lignin amine in a mass ratio of 105:0.5: 3; the lubricant is polyethylene wax; the dispersing agent is microcrystalline paraffin; the enhancer is formed by mixing nano silicon dioxide, nano calcium sulfate and nano barium sulfate in a mass ratio of 1:0.9: 1.1;
the preparation method of the high-strength V-shaped rubber belt in the embodiment is as follows:
(1) weighing the components according to the mass ratio, putting the carbon nano tube into a vacuum reactor, adjusting the vacuum degree to be 5Pa, filling inert gas for protection to ensure that the pressure of the reactor is 25Pa, heating the carbon nano tube to the temperature of 180 ℃, preserving the temperature for 20min, then reducing the temperature to 55 ℃, filling oxygen and ozone to ensure that the pressure in the reactor reaches 1.5 standard atmospheric pressures, reacting for 7h, and treating for 20min by using microwaves every 50 min; obtaining carboxyl carbon nano-tubes; the mass ratio of the oxygen to the ozone is 24: 1; the microwave power is 200W;
(2) uniformly mixing the carbon nano tube obtained in the last step, dicyclohexylcarbodiimide and lignin amine, heating to 90 ℃, preserving heat for 15min, then raising the temperature to 125 ℃, treating for 20min by using ultrasonic waves, reacting for 18h, washing and filtering by using ethanol to obtain a modified carbon nano tube; (3) pressurizing and mixing polyurethane rubber, nitrile rubber, fluororubber, acrylate rubber and isoprene rubber to obtain a mixture A;
(4) heating and melting the styrene-acrylonitrile copolymer, adding the modified carbon nano tube, and uniformly mixing to obtain a mixture B;
(5) and adding the mixture B into the mixture A, mixing, adding the components such as the lubricant, the dispersant, the enhancer and the like, mixing, and pouring into a mold for compression molding.
To verify the rationality of the inventive solution, the following comparative examples were set:
| comparative example 1 | The difference from example 1 is that no fluorine-containing rubber; |
| comparative example 2 | The difference from example 2 is that no styrene-acrylonitrile copolymer is contained; |
| comparative example 3 | The difference from the embodiment 3 is that the reinforcing agent is nano silicon dioxide; |
| comparative example 4 | The difference from the embodiment 1 is that the reinforcing agent is nano calcium sulfate; |
| comparative example 5 | The difference from example 2 is that the carbon nanotubes are not modified; |
| comparative example 6 | The difference from example 3 is that the carbon nanotubes in step (1) were not heated; |
| comparative example 7 | The difference from example 1 is that no microwave treatment is carried out in step (1); |
| comparative example 8 | The difference from example 2 is that no strengthening agent is present; |
| comparative example 9 | Prepared according to CN 201710505306.6; |
test examples
Rubber belts were made according to examples 1-3 and comparative examples 1-9 and tested for the following properties:
as can be seen from the table, the performance of examples 1-3 using the method of the present invention is significantly better than that of controls 1-9, and the unmodified carbon nanotubes used in control 6 are better than those of controls 1-5, and the modified carbon nanotube parameter-tuned controls 7 and 8 are better than those of the other controls.
Claims (4)
1. The high-strength V-shaped rubber belt is characterized by being prepared from the following components in parts by mass: 50-80 parts of polyurethane rubber, 10-20 parts of nitrile rubber, 15-25 parts of fluororubber, 30-50 parts of acrylate rubber, 10-20 parts of isoprene rubber, 2-5 parts of lubricating agent, 1-3 parts of dispersing agent, 30-50 parts of reinforcer, 10-15 parts of styrene-acrylonitrile copolymer and 0.8-1.5 parts of modified carbon nano tube; the modified carbon nano tube is prepared from a carboxyl carbon nano tube, dicyclohexylcarbodiimide and lignin amine according to the mass ratio of 100-110:0.5: 3; the enhancer is formed by mixing nano silicon dioxide, nano calcium sulfate and nano barium sulfate in a mass ratio of 0.5-1:0.8-1: 1-1.2;
the preparation method of the high-strength V-shaped rubber belt comprises the following steps:
(1) weighing the components according to the mass ratio, putting the carbon nano tube into a vacuum reactor, adjusting the vacuum degree to 3-5Pa, introducing inert gas for protection to ensure that the pressure of the reactor is 25-35Pa, heating the carbon nano tube to the temperature of 150 ℃ and keeping the temperature at 180 ℃ for 20-30min, then reducing the temperature to 45-55 ℃, introducing oxygen and ozone to ensure that the pressure in the reactor reaches 1.5-2 standard atmospheric pressures, reacting for 5-7h, and treating for 15-20min by microwave every 50-70 min; obtaining the carboxyl carbon nano tube, wherein the microwave power is 200-300W;
(2) uniformly mixing the carbon nano tube obtained in the last step with dicyclohexylcarbodiimide and lignin amine, heating to 80-90 ℃, preserving heat for 15-25min, then raising the temperature to 115-125 ℃, treating for 20-30min by using ultrasonic waves, reacting for 15-18h, washing and filtering by using ethanol to obtain a modified carbon nano tube;
(3) pressurizing and mixing polyurethane rubber, nitrile rubber, fluororubber, acrylate rubber and isoprene rubber to obtain a mixture A;
(4) heating and melting the styrene-acrylonitrile copolymer, adding the modified carbon nano tube, and uniformly mixing to obtain a mixture B;
(5) and adding the mixture B into the mixture A, mixing, adding a lubricant, a dispersant and a reinforcer, mixing, and pouring into a mold for compression molding.
2. The high strength V-rubber belt of claim 1 wherein said lubricant is polyethylene wax.
3. The high strength V-rubber belt of claim 1 wherein said dispersant is microcrystalline paraffin.
4. The high-strength V-shaped rubber belt according to claim 1, wherein in the step (1), the mass ratio of the oxygen to the ozone is 23-25: 1.
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