CN109723758B - High-performance V-belt and preparation method thereof - Google Patents
High-performance V-belt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-performance triangular belt which comprises a strong layer, wherein a stretching layer is arranged at the upper part of the strong layer, a compression layer is arranged at the lower part of the strong layer, and a cloth wrapping layer is wrapped at the outer sides of the stretching layer and the compression layer; the strong layer is a surface modified toughened palm fiber. The invention adopts the toughened palm fiber as a strong layer material, improves the tensile stress and the like generated in the running process of the triangular belt, optimizes the primer material formula, improves the physical and mechanical properties, the bending resistance and the fatigue resistance of the material, optimizes and strictly controls the production process of the triangular rubber, improves the process efficiency of the material and further ensures the quality of the product.
Description
Technical Field
The invention relates to the technical field of V-belts, in particular to a high-performance V-belt and a preparation method thereof.
Background
The triangle has two types of special belt core structures and rope core structures, and respectively consists of four parts, namely wrapping cloth, top rubber, tensile resistance bodies and bottom rubber; the V-belt of rope core structure is convenient to manufacture, general in tensile strength, low in price, wide in application, good in toughness and high in strength, and is suitable for occasions with higher rotating speeds, and the V-belt made of rubber is generally composed of a cloth covering layer, a stretching layer (top rubber), a strong layer (tensile layer), a compression layer (bottom rubber) and the like.
The cloth wrapping layer is composed of plain rubber canvas (mainly all cotton canvas and polyester cotton canvas) which is obliquely cut into 45 degrees, has excellent flexibility and friction performance, can connect all parts into a whole, protects other parts from abrasion and erosion, and can increase the effect of the stiffness of the V belt; the stretching glue layer is made of a glue material with high elasticity and excellent stretching performance, bears the tensile stress of the V-shaped belt during operation and bending, and plays a role in buffering and protecting the strong layer; the strength layer is a framework of the V belt, the main types of the strength layer comprise polyester cords, polyester toughened palm fibers, aramid cords, gum dipped cord fabrics and the like, the strength layer is used for bearing tensile stress and the like generated in the running process of the V belt and is a main stressed part in the transmission process of the V belt; the cushion gum is polyester toughened palm fiber belt core or triangular belt of cotton rope belt core around the strong layer, there is a layer of sizing material with good adhesive strength with the belt core, namely cushion gum, it plays a role in fixing the belt core, and can absorb the dynamic shear stress that the triangular belt frequently deforms and produces when the high-speed operation; the compression glue layer is composed of a glue material with excellent bending fatigue resistance, bears the compression stress generated when the triangular belt is bent during operation, keeps the rigidity and elasticity of the triangular belt, and plays a role in increasing the section of the triangular belt and the friction contact surface of the triangular belt and the belt wheel and improving the transmission efficiency.
Based on this, the strong layer and the base rubber have a vital role on the performance of the V-belt, the existing Chinese patent document (publication number: CN108189497A) discloses a high-strength V-belt, which comprises a body, the body is sequentially provided with a back rubber, a buffer rubber and a base rubber from top to bottom, the buffer rubber is provided with a rope, the outer surface of the body is provided with a canvas, the canvas is respectively connected with the base rubber, the buffer rubber and the back rubber through a bonding layer, the rope adopts toughened palm fibers, the manufacturing process of the invention comprises the steps of raw material pretreatment, canvas treatment, rope treatment, cloth wrapping treatment, vulcanization treatment and quality inspection, the V-belt rope adopts toughened palm fibers, the surface energy of the toughened palm fibers is low, bonding with rubber is difficult to occur, and the bonding strength of the rope is further influenced, so that the overall performance of the V-belt is poor, the Chinese patent document (publication number: CN103966853A) discloses a polyester toughened palm fiber bonding activator and a treatment process of the polyester toughened palm fibers, the bonding activator and the polyester toughened palm fibers, the technical scheme is that glycerol ether type epoxy resin, the closed isocyanate, the epoxy resin dispersant is put into a polyester toughening adhesive in a reaction kettle, the polyester toughening epoxy resin bonding agent, the polyester toughening palm fibers are stirred, the polyester toughening adhesive is greatly improved, the bonding strength of the polyester toughened palm fibers is improved, the bonding agent is greatly, the bonding effect of the polyester toughened palm fibers is improved, the toughened polyester fiber bonding agent is improved, and the toughened fiber bonding agent is improved, the bonding effect of the toughened fiber bonding agent is improved by dipping of the toughened polyester toughened fiber bonding agent, the toughened fiber adhesive is greatly, the toughened fiber adhesive.
Chinese patent document (publication No. CN108189497A) discloses a rubber composition for manufacturing a compression layer of a V-belt of a wrapping cloth and a preparation method thereof, wherein the main components of the rubber composition comprise: the formula of the compression layer material is given in the document, the adopted raw materials are conventional, the mechanical property of the base rubber is limited, the adhesion strength between the base rubber and the thread rope is not good, and the performance of the prepared V-belt is not good.
Disclosure of Invention
The invention aims to provide a high-performance V-belt and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-performance triangular belt comprises a strong layer, wherein a stretching layer is arranged at the upper part of the strong layer, a compression layer is arranged at the lower part of the strong layer, and a cloth wrapping layer is wrapped at the outer sides of the stretching layer and the compression layer;
the strong layer is a surface modified toughened palm fiber;
the stretching layer comprises the following raw materials in parts by weight:
40-50 parts of chloroprene rubber, 5-15 parts of natural rubber, 10-20 parts of polyurethane resin, 10-20 parts of talcum powder, 4-10 parts of aromatic oil and 3-9 parts of sodium tripolyphosphate.
The further scheme of the invention is that the preparation method of the surface modified toughened palm fiber comprises the steps of placing the toughened palm fiber in a nitric acid solution for soaking for 1-2 hours, taking out the toughened palm fiber, washing with deionized water, drying in the air, placing the air in a 10% sodium hydroxide solution, performing surface oxidation treatment by adopting alternating current, placing the surface oxidized palm fiber in 1.5-2.5 mol/L sodium hypochlorite for reaction for 20-30 minutes, washing with deionized water for 2-3 times, adding the surface oxidized palm fiber and a penetrating agent into a high-pressure reaction kettle according to the weight ratio of 1:3, reacting at the pressure of 2-4MPa, the reaction temperature of 100-.
The invention further comprises the following steps: the surface oxidation time of the alternating current is 1-3h, and the current density is 0.2-0.5A/dm2The temperature of the oxidation treatment is 20-30 ℃.
The invention further comprises the following steps: the surface oxidation time of the alternating current is 2h, and the current density is 0.35A/dm2The temperature of the oxidation treatment was 25 ℃.
The further scheme of the invention is that the penetrating agent is prepared by the method of mixing ZnCl with the concentration of 0.5-1.5 mol/L2Adding into a four-mouth reaction bottle, adding glacial acetic acid to adjust pH to 4.0-5.0, adding quantum dot auxiliary agent liquid dropwise into the four-mouth reaction bottle at a speed of 2-5ml/min while stirring, adding rare earth lanthanum chloride, and continuously stirring for 10-20 min.
The invention further comprises the following steps: the preparation method of the quantum dot auxiliary agent liquid comprises the steps of adding the nano-diamond into an acetone solution according to the weight ratio of 1:4, carrying out ultrasonic dispersion for 20-30min, then adding the silicon dioxide microsphere emulsion accounting for 5-9% of the total weight of the nano-diamond, and continuing stirring for 20-30 min.
The invention further comprises the following steps: the compression layer comprises the following raw materials in parts by weight:
30-40 parts of natural rubber, 20-30 parts of styrene-butadiene rubber, 5-15 parts of regenerated rubber, 4-8 parts of white carbon black, 3-6 parts of cellulose nanowhiskers, 5-10 parts of tin oxide, 5-9 parts of a vulcanizing agent, 2-6 parts of a compatilizer and 1-4 parts of modified alkali lignin.
The invention further comprises the following steps: the preparation method of the modified alkali lignin comprises the steps of adding the alkali lignin into a magnetic stirrer, then adding the alkali lignin into silane-containing deionized water, increasing the rotating speed to 400r/min, stirring for 10-20min at the stirring temperature of 70-90 ℃, then adding sepiolite powder accounting for 10-20% of the total amount of the alkali lignin, stirring for 20-30min, finally adding methacrylic acid glycidyl ether accounting for 2-8% of the total amount of the alkali lignin, continuing stirring for 1-2h, finishing the reaction, centrifuging, washing and drying.
The invention further comprises the following steps: the vulcanizing agent is tetrabenzylthiuram disulfide; the compatibilizer is an oxazoline.
The invention also provides a method for preparing the high-performance V-belt, which comprises the following steps:
firstly, plasticating natural rubber, styrene-butadiene rubber and regenerated rubber for 80-100s, then adding white carbon black, cellulose nanowhiskers, tin oxide, modified alkali lignin, a vulcanizing agent and a compatilizer, continuously mixing for 100-200s, and then calendering to obtain a compression layer;
plasticating chloroprene rubber and natural rubber for 70-80s, then adding polyurethane resin, talcum powder, aromatic oil and sodium tripolyphosphate, and continuously mixing for 100-200s to obtain a stretching layer rubber material for later use;
step three, heating the stretching layer rubber material prepared in the step two to be molten, then drawing the surface-modified toughened palm fibers from the molten stretching layer rubber material until the stretching layer rubber material wraps the surface-modified toughened palm fibers to form buffer cords, and then rolling the buffer cords through a rotating roller to form a pre-used layer;
and step four, adhering the compression layer obtained in the step one to the lower part of the pre-use layer to form a base layer, wrapping the base layer through a cloth wrapping layer to form a pre-use triangular belt, putting the pre-use triangular belt into a mould, conveying the pre-use triangular belt into a vulcanizing tank for vulcanizing, then cutting and polishing to obtain a finished product, and then inspecting, packaging and storing to obtain the high-performance triangular belt.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the toughened palm fiber as a strong layer material, improves the tensile stress and the like generated in the running process of the triangular belt, optimizes the primer material formula, improves the physical and mechanical properties, the bending resistance and the fatigue resistance of the material, optimizes and strictly controls the production process of the triangular rubber, improves the process efficiency of the material and further ensures the quality of the product.
(2) The toughened palm fiber is firstly placed in a nitric acid solution to play a role in activating, the reaction energy is improved, then surface oxidation treatment is carried out under the condition of alternating current, the microstructure on the surface of the toughened palm fiber is loosened, fine grains and micropores are generated on the surface after sodium hypochlorite treatment, then the toughened palm fiber is mixed with a penetrating agent and added into a high-pressure reaction kettle, the penetrating agent is easier to penetrate in the fine grains and the micropores, and the penetrating agent is ZnCl2Prepared by mixing with quantum dot auxiliary agent liquid and rare earth lanthanum chloride under the condition of adjusting pH by glacial acetic acid, wherein the quantum dot auxiliary agent liquid and the rare earth lanthanum chloride excite ZnCl2Performing osmosis treatment to improve the osmosis efficiency, and performing high-temperature treatment on the toughened palm fibers to obtain organic compounds on the surface in the subsequent gluing process with the primerAnd evaporating, fusing the left micropores and loose structures with the primer material, cooling to form an integral structure, and simultaneously inserting the cellulose nanowhiskers in the primer into the pores of the toughened palm fiber to greatly improve the bonding strength between the cellulose nanowhiskers and the primer material, so that the whole triangular glue is obviously improved.
(3) In the preparation of the primer, the natural rubber, the butadiene styrene rubber and the regenerated rubber are used as base materials, the auxiliary material auxiliary agent is added to enhance the performance of the primer, the added cellulose nanowhiskers have rich surface hydroxyl groups, meanwhile, the composite material has high modulus and high length-diameter ratio, can orderly combine the raw materials in the primer, improves the compactness among the raw materials, further improves the mechanical property and the bending fatigue resistance of the material, and the added filler auxiliary agent tin oxide is of a net structure, plays a synergistic effect with the vitamin nano crystal whisker and is orderly combined with the vitamin nano crystal whisker, so that the matrix is orderly coated by the net, thereby integrating a structural system, further ensuring that the primer structure is firmer, and the added alkali lignin plays a role in reducing water in concrete conventionally, and the base glue and raw materials such as tin oxide form a crossed network structure, so that the mechanical properties and the like of the base glue are enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the high-performance triangular belt comprises a strong layer, wherein a stretching layer is arranged at the upper part of the strong layer, a compression layer is arranged at the lower part of the strong layer, and a wrapping cloth layer is wrapped at the outer sides of the stretching layer and the compression layer;
the strong layer is a surface modified toughened palm fiber;
the stretching layer comprises the following raw materials in parts by weight:
40 parts of chloroprene rubber, 5 parts of natural rubber, 10 parts of polyurethane resin, 10 parts of talcum powder, 4 parts of aromatic oil and 3 parts of sodium tripolyphosphate.
The preparation method of the surface-modified toughened palm fiber comprises the steps of placing the toughened palm fiber in a nitric acid solution for soaking for 1 hour, taking out the toughened palm fiber, washing with deionized water, air-drying, placing the toughened palm fiber in a 10% sodium hydroxide solution, performing surface oxidation treatment by using alternating current, placing the toughened palm fiber in sodium hypochlorite with the concentration of 1.5 mol/L for reaction for 20 minutes, washing with deionized water for 2 times, adding the deionized water and a penetrating agent into a high-pressure reaction kettle according to the weight ratio of 1:3, wherein the reaction pressure is 2MPa, the reaction temperature is 100 ℃, the reaction time is 2 hours, after the reaction is finished, washing with water, and drying with a constant-temperature drying oven at 40 ℃ for 2 hours.
The surface oxidation time of the alternating current of the example was 1 hour, and the current density was 0.2A/dm2The temperature of the oxidation treatment was 20 ℃.
The penetrant of this example is prepared by mixing ZnCl with a concentration of 0.5 mol/L2Adding into a four-mouth reaction bottle, adding glacial acetic acid to adjust pH to 4.0, dropwise adding quantum dot auxiliary agent liquid into the four-mouth flask at the speed of 2ml/min while stirring, finally adding rare earth lanthanum chloride, and continuously stirring for 10 min.
The preparation method of the quantum dot auxiliary agent liquid comprises the steps of adding the nano-diamond into an acetone solution according to the weight ratio of 1:4, performing ultrasonic dispersion for 20min, then adding a silicon dioxide microsphere emulsion accounting for 5% of the total amount of the nano-diamond, and continuing stirring for 20 min.
The compression layer of this example comprises the following raw materials in parts by weight:
30 parts of natural rubber, 20 parts of styrene-butadiene rubber, 5 parts of regenerated rubber, 4 parts of white carbon black, 3 parts of cellulose nanowhiskers, 5 parts of tin oxide, 5 parts of a vulcanizing agent, 2 parts of a compatilizer and 1 part of modified alkali lignin.
The preparation method of the modified alkali lignin comprises the steps of adding the alkali lignin into a magnetic stirrer, then adding the alkali lignin into silane-containing deionized water, increasing the rotating speed to 200r/min, stirring for 10min at the stirring temperature of 70 ℃, then adding sepiolite powder accounting for 10% of the total amount of the alkali lignin, stirring for 20min, finally adding methacrylic acid glycidyl ether accounting for 2% of the total amount of the alkali lignin, continuing stirring for 1h, finishing the reaction, centrifuging, washing and drying.
The vulcanizing agent in this example is tetrabenzylthiuram disulfide; the compatibilizer is an oxazoline.
The method for preparing the high-performance V-belt comprises the following steps:
firstly, plasticating natural rubber, styrene-butadiene rubber and regenerated rubber for 80s, then adding white carbon black, cellulose nanowhiskers, tin oxide, modified alkali lignin, a vulcanizing agent and a compatilizer, continuously mixing for 100s, and then calendering to obtain a compression layer;
secondly, plasticating chloroprene rubber and natural rubber for 70s, then adding polyurethane resin, talcum powder, aromatic oil and sodium tripolyphosphate, and continuing to mix for 100s to obtain an extension layer rubber material for later use;
step three, heating the stretching layer rubber material prepared in the step two to be molten, then drawing the surface-modified toughened palm fibers from the molten stretching layer rubber material until the stretching layer rubber material wraps the surface-modified toughened palm fibers to form buffer cords, and then rolling the buffer cords through a rotating roller to form a pre-used layer;
and step four, adhering the compression layer obtained in the step one to the lower part of the pre-use layer to form a base layer, wrapping the base layer through a cloth wrapping layer to form a pre-use triangular belt, putting the pre-use triangular belt into a mould, conveying the pre-use triangular belt into a vulcanizing tank for vulcanizing, then cutting and polishing to obtain a finished product, and then inspecting, packaging and storing to obtain the high-performance triangular belt.
Example 2:
the high-performance triangular belt comprises a strong layer, wherein a stretching layer is arranged at the upper part of the strong layer, a compression layer is arranged at the lower part of the strong layer, and a wrapping cloth layer is wrapped at the outer sides of the stretching layer and the compression layer;
the strong layer is a surface modified toughened palm fiber;
the stretching layer comprises the following raw materials in parts by weight:
50 parts of chloroprene rubber, 15 parts of natural rubber, 20 parts of polyurethane resin, 20 parts of talcum powder, 10 parts of aromatic oil and 9 parts of sodium tripolyphosphate.
The preparation method of the surface-modified toughened palm fiber comprises the steps of placing the toughened palm fiber in a nitric acid solution for soaking for 2 hours, taking out the toughened palm fiber, washing with deionized water, air-drying, placing the toughened palm fiber in a 10% sodium hydroxide solution, carrying out surface oxidation treatment by using alternating current, placing the toughened palm fiber in sodium hypochlorite with the concentration of 2.5 mol/L for reaction for 20-30min, washing with deionized water for 3 times, adding the deionized water and a penetrating agent into a high-pressure reaction kettle according to the weight ratio of 1:3, wherein the reaction pressure is 4MPa, the reaction temperature is 110 ℃, the reaction time is 5 hours, finishing the reaction, then washing with water, and drying with a constant-temperature drying oven at 60 ℃ for 3 hours.
The surface oxidation time of the alternating current of the present example was 3 hours, and the current density was 0.5A/dm2The temperature of the oxidation treatment was 30 ℃.
The penetrant of this example is prepared by mixing ZnCl with a concentration of 1.5 mol/L2Adding into a four-mouth reaction bottle, adding glacial acetic acid to adjust pH to 5.0, dropwise adding quantum dot auxiliary agent liquid into the four-mouth flask at a speed of 5ml/min while stirring, adding rare earth lanthanum chloride, and continuously stirring for 20 min.
The preparation method of the quantum dot auxiliary agent liquid comprises the steps of adding the nano-diamond into an acetone solution according to the weight ratio of 1:4, performing ultrasonic dispersion for 30min, then adding the silicon dioxide microsphere emulsion accounting for 9% of the total amount of the nano-diamond, and continuing stirring for 30 min.
The compression layer of this example comprises the following raw materials in parts by weight:
40 parts of natural rubber, 30 parts of styrene-butadiene rubber, 15 parts of regenerated rubber, 8 parts of white carbon black, 6 parts of cellulose nanowhiskers, 10 parts of tin oxide, 9 parts of a vulcanizing agent, 6 parts of a compatilizer and 4 parts of modified alkali lignin.
The preparation method of the modified alkali lignin comprises the steps of adding the alkali lignin into a magnetic stirrer, then adding the alkali lignin into silane-containing deionized water, increasing the rotating speed to 400r/min, stirring for 20min at the stirring temperature of 90 ℃, then adding sepiolite powder accounting for 20% of the total amount of the alkali lignin, stirring for 30min, finally adding methacrylic acid glycidyl ether accounting for 8% of the total amount of the alkali lignin, continuing stirring for 2h, finishing the reaction, centrifuging, washing and drying.
The vulcanizing agent in this example is tetrabenzylthiuram disulfide; the compatibilizer is an oxazoline.
The method for preparing the high-performance V-belt comprises the following steps:
firstly, plasticating natural rubber, styrene-butadiene rubber and regenerated rubber for 100s, then adding white carbon black, cellulose nanowhiskers, tin oxide, modified alkali lignin, a vulcanizing agent and a compatilizer, continuously mixing for 200s, and then calendering to obtain a compression layer;
secondly, plasticating chloroprene rubber and natural rubber for 80s, then adding polyurethane resin, talcum powder, aromatic oil and sodium tripolyphosphate, and continuing to mix for 200s to obtain an extension layer rubber material for later use;
step three, heating the stretching layer rubber material prepared in the step two to be molten, then drawing the surface-modified toughened palm fibers from the molten stretching layer rubber material until the stretching layer rubber material wraps the surface-modified toughened palm fibers to form buffer cords, and then rolling the buffer cords through a rotating roller to form a pre-used layer;
and step four, adhering the compression layer obtained in the step one to the lower part of the pre-use layer to form a base layer, wrapping the base layer through a cloth wrapping layer to form a pre-use triangular belt, putting the pre-use triangular belt into a mould, conveying the pre-use triangular belt into a vulcanizing tank for vulcanizing, then cutting and polishing to obtain a finished product, and then inspecting, packaging and storing to obtain the high-performance triangular belt.
Example 3:
the high-performance triangular belt comprises a strong layer, wherein a stretching layer is arranged at the upper part of the strong layer, a compression layer is arranged at the lower part of the strong layer, and a wrapping cloth layer is wrapped at the outer sides of the stretching layer and the compression layer;
the strong layer is a surface modified toughened palm fiber;
the stretching layer comprises the following raw materials in parts by weight:
45 parts of chloroprene rubber, 10 parts of natural rubber, 15 parts of polyurethane resin, 15 parts of talcum powder, 7 parts of aromatic oil and 4.5 parts of sodium tripolyphosphate.
The preparation method of the surface-modified toughened palm fiber comprises the steps of placing the toughened palm fiber in a nitric acid solution for soaking for 1.5 hours, taking out the toughened palm fiber, washing with deionized water, air-drying, placing the toughened palm fiber in a 10% sodium hydroxide solution, conducting surface oxidation treatment by using alternating current, placing the toughened palm fiber in 2 mol/L sodium hypochlorite for reaction for 25min, washing with deionized water for 3 times, adding the deionized water and a penetrating agent into a high-pressure reaction kettle according to a weight ratio of 1:3, wherein the reaction pressure is 3MPa, the reaction temperature is 105 ℃, the reaction time is 3.5 hours, finishing the reaction, then washing with water, and drying in a 50 ℃ constant-temperature drying oven for 2.5 hours.
The surface oxidation time of the alternating current of the example was 2 hours, and the current density was 0.35A/dm2The temperature of the oxidation treatment was 25 ℃.
The penetrant of this example is prepared by mixing ZnCl with a concentration of 1.0 mol/L2Adding into a four-mouth reaction bottle, adding glacial acetic acid to adjust the pH value to 4.5, then dropwise adding the quantum dot auxiliary agent solution into the four-mouth reaction bottle at the speed of 3.5ml/min, stirring while dropwise adding, finally adding rare earth lanthanum chloride, and continuously stirring for 15 min.
The preparation method of the quantum dot assistant liquid comprises the steps of adding the nano-diamond into an acetone solution according to the weight ratio of 1:4, performing ultrasonic dispersion for 25min, then adding a silicon dioxide microsphere emulsion accounting for 7% of the total amount of the nano-diamond, and continuing stirring for 25 min.
The compression layer of this example comprises the following raw materials in parts by weight:
35 parts of natural rubber, 25 parts of styrene-butadiene rubber, 10 parts of regenerated rubber, 6 parts of white carbon black, 4.5 parts of cellulose nanowhiskers, 7.5 parts of tin oxide, 7 parts of a vulcanizing agent, 4 parts of a compatilizer and 2.5 parts of modified alkali lignin.
The preparation method of the modified alkali lignin comprises the steps of adding the alkali lignin into a magnetic stirrer, then adding the alkali lignin into silane-containing deionized water, increasing the rotating speed to 300r/min, stirring for 15min at the stirring temperature of 80 ℃, then adding sepiolite powder accounting for 15% of the total amount of the alkali lignin, stirring for 25min, finally adding methacrylic acid glycidyl ether accounting for 5% of the total amount of the alkali lignin, continuing stirring for 1.5h, and after the reaction is finished, centrifuging, washing and drying.
The vulcanizing agent in this example is tetrabenzylthiuram disulfide; the compatibilizer is an oxazoline.
The method for preparing the high-performance V-belt comprises the following steps:
firstly, plasticating natural rubber, styrene-butadiene rubber and regenerated rubber for 90s, then adding white carbon black, cellulose nanowhiskers, tin oxide, modified alkali lignin, a vulcanizing agent and a compatilizer, continuously mixing for 150s, and then calendering to obtain a compression layer;
secondly, plasticating chloroprene rubber and natural rubber for 75s, then adding polyurethane resin, talcum powder, aromatic oil and sodium tripolyphosphate, and continuing to mix for 150s to obtain an extension layer rubber material for later use;
step three, heating the stretching layer rubber material prepared in the step two to be molten, then drawing the surface-modified toughened palm fibers from the molten stretching layer rubber material until the stretching layer rubber material wraps the surface-modified toughened palm fibers to form buffer cords, and then rolling the buffer cords through a rotating roller to form a pre-used layer;
and step four, adhering the compression layer obtained in the step one to the lower part of the pre-use layer to form a base layer, wrapping the base layer through a cloth wrapping layer to form a pre-use triangular belt, putting the pre-use triangular belt into a mould, conveying the pre-use triangular belt into a vulcanizing tank for vulcanizing, then cutting and polishing to obtain a finished product, and then inspecting, packaging and storing to obtain the high-performance triangular belt.
Comparative example 1:
the test was carried out using the V-belt of example 1 among high-strength V-belts disclosed in Chinese patent publication (publication No. CN 108189497A).
Comparative example 2:
chinese patent literature (publication No. CN103966853A) discloses a polyester toughened palm fiber bonding activator and a toughened palm fiber in the treatment process of the polyester toughened palm fiber to replace the surface modified toughened palm fiber in the embodiment 3.
Comparative example 3:
the only difference from the preparation method of the surface modified toughened palm fiber in the example 3 is that the surface oxidation treatment is not carried out by adopting alternating current.
Comparative example 4:
chinese patent literature (publication number: CN108189497A) discloses a rubber composition for manufacturing a compression layer of a V-belt of a wrapping cloth and a material in the preparation method thereof as the compression layer.
Comparative example 5:
the material and preparation process are exactly the same as those of example 3, and the only difference is that no cellulose nanowhiskers are added to the compression layer.
Comparative example 6:
the material and preparation process are the same as those of the example 3, and the only difference is that modified alkali lignin is not added into the compression layer.
Comparative example 7:
the material and the preparation process are completely the same as those of the example 3, and the only difference is that sepiolite powder is not added in the modification of the alkali lignin.
The bonding strength of the cord is tested according to the test standard GB/T3688-1983 method for testing the bonding strength of the cord and the rubber of the V-belt;
the test method is as follows:
and putting the sample on a supporter, allowing the stripped central cord to droop from the opening of the supporter, clamping the cord into a lower clamp holder, adjusting the position of the sample in the supporter to enable the cord to be positioned at the center of the width of the opening, starting a testing machine, pulling and poking the cord until the cord is completely pulled out, and measuring the force exerted on the sample to pull out, namely the bonding strength of the cord.
The results of the cord bond strength test are as follows:
as seen from example 3 and comparative examples 1-3, the adhesive strength of the cord is improved in example 3 of the present invention as compared to comparative example 1Is 12KN.m higher-1The improvement rate was 44.44%, and the cord adhesion strength was increased by 8 kn.m. relative to comparative example 2-1The improvement rate is 25.80%, and the toughened palm fiber modified by the method can obviously improve the bonding strength of the thread rope.
In addition, the invention also researches the fatigue life and tensile strength of the V-belt.
The fatigue life test method comprises the steps of cutting a test sample to 100mm in length, 20mm in width and 4mm in thickness, then placing the test sample in a fatigue testing machine for testing, recording the initial test time A, and recording the termination time B when abnormal phenomena such as cracks appear in a triangular belt, wherein the fatigue life is B-A.
The tensile strength is subjected to performance test by adopting a triangular belt tensile strength tester.
The test results were as follows:
compared with the comparative example 4, the tensile strength of the embodiment 3 is improved by 4KN, the improvement rate is 80%, meanwhile, the tensile strength is improved by 3KN due to the added modified alkali lignin, and the tensile strength is improved by 2KN due to the added cellulose nanowhiskers.
The compression layer has great influence on the performance of the V-belt, so the invention also explores the performance of the rubber material of the compression layer.
| Performance of the test | Test standard |
| Tensile Properties | GB/T 528-1998 |
| Hardness of | GB/T 6031-1998 |
| DIN abrasion | GB/T 9867-88 |
The results of the performance test of the compression layers obtained in examples 1 to 3 and comparative examples 4 to 7 are as follows
As shown in comparative example 3 and comparative examples 4 to 7, the tensile strength of example 3 of the present invention was improved by 5.0MPa and the improvement rate was 42.02% as compared with comparative example 4; the elongation at break is improved by 103MPa, and the improvement rate is 26.48 percent; DIN abrasion volume reduction of 26mm3The improvement rate is 14.61%; meanwhile, the elongation at break of the added modified alkali lignin is improved by 71MPa, the tensile strength is improved by 3.8MPa, and the mechanical properties are all obviously improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A high-performance triangular belt comprises a strong layer and is characterized in that a stretching layer is arranged at the upper part of the strong layer, a compression layer is arranged at the lower part of the strong layer, and a cloth coating layer is wrapped at the outer sides of the stretching layer and the compression layer;
the strong layer is a surface modified toughened palm fiber;
the stretching layer comprises the following raw materials in parts by weight:
40-50 parts of chloroprene rubber, 5-15 parts of natural rubber, 10-20 parts of polyurethane resin, 10-20 parts of talcum powder, 4-10 parts of aromatic oil and 3-9 parts of sodium tripolyphosphate;
the compression layer comprises the following raw materials in parts by weight:
30-40 parts of natural rubber, 20-30 parts of styrene-butadiene rubber, 5-15 parts of regenerated rubber, 4-8 parts of white carbon black, 3-6 parts of cellulose nanowhiskers, 5-10 parts of tin oxide, 5-9 parts of a vulcanizing agent, 2-6 parts of a compatilizer and 1-4 parts of modified alkali lignin.
2. The high-performance V-belt as claimed in claim 1, wherein the surface-modified toughened palm fiber is prepared by soaking the toughened palm fiber in a nitric acid solution for 1-2h, taking out and washing with deionized water, air-drying, placing in a 10% sodium hydroxide solution, performing surface oxidation treatment with alternating current, placing in sodium hypochlorite with a concentration of 1.5-2.5 mol/L for 20-30min, washing with deionized water for 2-3 times, adding the deionized water and a penetrant into a high-pressure reaction kettle according to a weight ratio of 1:3, reacting at a pressure of 2-4MPa and a reaction temperature of 100 ℃ and 110 ℃ for 2-5h, finishing the reaction, washing with water, and drying in a constant-temperature drying oven at 40-60 ℃ for 2-3 h.
3. The V-belt according to claim 2, wherein the alternating current is applied for a surface oxidation time of 1-3 hours and a current density of 0.2-0.5A/dm2The temperature of the oxidation treatment is 20-30 ℃.
4. The V-belt according to claim 3, wherein the alternating current is applied for a surface oxidation time of 2 hours and a current density of 0.35A/dm2The temperature of the oxidation treatment was 25 ℃.
5. The V-belt according to claim 2, wherein the penetrating agent is prepared by mixing ZnCl with a concentration of 0.5-1.5 mol/L2Adding into a four-mouth reaction bottle, adding glacial acetic acid to adjust pH to 4.0-5.0, adding quantum dot auxiliary agent liquid dropwise into the four-mouth reaction bottle at a speed of 2-5ml/min while stirring, adding rare earth lanthanum chloride, and continuously stirring for 10-20 min.
6. The high-performance V-belt according to claim 5, wherein the quantum dot assistant liquid is prepared by adding nanodiamond into acetone solution according to a weight ratio of 1:4, performing ultrasonic dispersion for 20-30min, adding silica microsphere emulsion accounting for 5-9% of the total amount of nanodiamond, and continuing stirring for 20-30 min.
7. The high-performance V-belt as claimed in claim 1, wherein the modified alkali lignin is prepared by adding alkali lignin into a magnetic stirrer, adding into silane-containing deionized water, increasing the rotation speed to 200-400r/min, stirring for 10-20min at 70-90 ℃, adding sepiolite powder accounting for 10-20% of the total amount of alkali lignin, stirring for 20-30min, adding glycidyl methacrylate accounting for 2-8% of the total amount of alkali lignin, stirring for 1-2h, reacting, centrifuging, washing, and drying.
8. The high performance V-belt according to claim 1 wherein said vulcanizing agent is tetrabenzylthiuram disulfide; the compatibilizer is an oxazoline.
9. A method of making a high performance v-belt according to any one of claims 1 to 8, comprising the steps of:
firstly, plasticating natural rubber, styrene-butadiene rubber and regenerated rubber for 80-100s, then adding white carbon black, cellulose nanowhiskers, tin oxide, modified alkali lignin, a vulcanizing agent and a compatilizer, continuously mixing for 100-200s, and then calendering to obtain a compression layer;
plasticating chloroprene rubber and natural rubber for 70-80s, then adding polyurethane resin, talcum powder, aromatic oil and sodium tripolyphosphate, and continuously mixing for 100-200s to obtain a stretching layer rubber material for later use;
step three, heating the stretching layer rubber material prepared in the step two to be molten, then drawing the surface-modified toughened palm fibers from the molten stretching layer rubber material until the stretching layer rubber material wraps the surface-modified toughened palm fibers to form buffer cords, and then rolling the buffer cords through a rotating roller to form a pre-used layer;
and step four, adhering the compression layer obtained in the step one to the lower part of the pre-use layer to form a base layer, wrapping the base layer through a cloth wrapping layer to form a pre-use triangular belt, putting the pre-use triangular belt into a mould, conveying the pre-use triangular belt into a vulcanizing tank for vulcanizing, then cutting and polishing to obtain a finished product, and then inspecting, packaging and storing to obtain the high-performance triangular belt.
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