CN111333924A - Rubber material for rubber telescopic sleeve, rubber telescopic sleeve and preparation method thereof - Google Patents
Rubber material for rubber telescopic sleeve, rubber telescopic sleeve and preparation method thereof Download PDFInfo
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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
- C08L7/00—Compositions of natural rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0032—Producing rolling bodies, e.g. rollers, wheels, pulleys or pinions
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- 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
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Abstract
The invention discloses a rubber material for a rubber telescopic sleeve, the rubber telescopic sleeve and a preparation method thereof, and belongs to the technical field of rubber materials. The reinforcing filling system and the vulcanization crosslinking system in the rubber compound are matched with each other to generate a synergistic effect, so that the vulcanization time is greatly shortened, the product performance reduction caused by vulcanization reduction is prevented, and the prepared rubber telescopic sleeve is high in rigidity and good in elasticity. According to the preparation method of the rubber telescopic sleeve, the components are sequentially added into an internal mixer for mixing, vulcanization and filtration, so that the components are fully melted and dispersed, and the high consistency of the inner and outer layer materials of the telescopic sleeve is ensured; the automatic temperature control system is adopted to carry out long-time temperature rise and temperature control, and the uniformity of the internal and external hardness of the telescopic sleeve is ensured.
Description
Technical Field
The invention belongs to the technical field of rubber materials, and particularly relates to a rubber material for a rubber telescopic sleeve, the rubber telescopic sleeve and a preparation method of the rubber telescopic sleeve.
Background
With the rapid development of Chinese economy, the production and consumption of steel are increased year by year, and in order to meet the demand, various production lines of domestic metallurgical enterprises, such as plain carbon steel pickling lines, continuous annealing lines, stainless steel pickling lines, tinplate wires and the like, are increased. The uncoiling of the steel coil at the front end of the production line and the coiling of the steel plate at the rear end of the production line both need rubber telescopic sleeves, and the rubber telescopic sleeves become important easy-to-wear spare parts which are not available or are lacking in metallurgical enterprises.
The performance of the rubber telescopic sleeve is required to be similar to that of a wheel tire, and the rubber telescopic sleeve is required to have higher strength and good elasticity. Although the rubber bellows and the tire are required to have high strength and good elasticity, the use environments of the rubber bellows and the tire are greatly different, which causes the rubber bellows and the tire to be different. The wheel includes rim and spoke, and rim and spoke all can be used to support outer tire to improve the bearing strength of wheel, and still can further alleviate the tire pressure that receives through inflating the adjustment child when the tire uses. However, the rubber telescopic sleeve is not supported by supporting equipment when in use, so the requirement on the strength of the rubber telescopic sleeve is far higher than that of a tire; moreover, the rubber telescopic sleeve belongs to a thick product, and the surface of the rubber telescopic sleeve is required to have good elasticity and high strength, and the overall strength and elasticity of the rubber telescopic sleeve are required to meet the use standard.
In the prior art, in order to obtain a rubber material with both strength and elasticity, related technical solutions are disclosed, such as patent application nos: 2019106608761, filing date: 7, month 22 in 2019, the name of invention creation is: the tire sidewall rubber of the application comprises the following components in parts by weight: 30-80 parts of natural rubber; 20-70 parts of TBIR-BR primary rubber; 2-7 parts of zinc oxide; 1-3.5 parts of stearic acid; 3-7 parts of an anti-aging agent; 40-60 parts of a filler; 2-8 parts of operating oil; 0-3 parts of a filler dispersant; 0.8-2 parts of an accelerator; 0.6-2 parts of sulfur; 0-0.4 part of anti-vulcanization reversion agent. According to the scheme, the natural rubber and the TBIR-BR master batch are matched with other components for synergistic action, so that the compatibility and the co-vulcanization characteristic of the natural rubber and the butadiene rubber are further improved, and the finally obtained tire sidewall rubber has the advantages of excellent fatigue resistance and low rolling resistance and heat generation under compression. According to the scheme, the rubber is prepared by adopting two mixed rubber stocks of natural rubber and TBIR-BR master batch, so that the production cost is saved, but the strength of the manufactured product is far less than the use standard of the rubber telescopic sleeve.
Again as in patent application No.: 201110405074X, filing date: in 2011, 11 and 28 months, the invention and creation name is: the rubber material of the tire tread of the engineering machinery contains styrene butadiene rubber, inorganic reinforced filler, an anti-aging agent, zinc oxide, stearic acid, sulfur and an accelerator, and is prepared from a plurality of materials, wherein the materials comprise: styrene butadiene rubber SBR1500, zinc oxide, stearic acid, an anti-aging agent 4010NA, an anti-aging agent FHD-60, an anti-aging agent BLE-W, an anti-reversion agent WK-901, carbon black N234, white carbon black VW3, a silane coupling agent Si-69, rosin, aromatic oil, an accelerator NS and insoluble sulfur IS-6005. The rubber material provided by the scheme is mainly used for the tread of the engineering machinery tire so as to improve the aging resistance, wear resistance, cutting resistance, puncture resistance and chipping resistance of the tread of the engineering machinery tire, so that the service life of the engineering machinery tire is prolonged, and the manufacturing cost is reduced.
According to the scheme, the styrene butadiene rubber SBR1500 is used as the base rubber, the styrene butadiene rubber SBR1500 is good in wear resistance, and has good service performance when used as a tire preparation raw material, but the rubber expansion sleeve prepared by the components has general processing characteristics, cannot ensure the uniformity of internal and external hardness distribution, still cannot meet the requirement of overall strength, and can possibly cause the steel plate to wrinkle or deform during coiling, so that the service life is shortened.
In conclusion, based on the fact that the use environments of the tire and the rubber telescopic sleeve are different and the performance requirements of the tire and the rubber telescopic sleeve are different, how to design a sizing material component suitable for the rubber telescopic sleeve and a preparation method thereof can ensure that the overall strength and elasticity of the rubber telescopic sleeve reach the use standards so as to overcome the defect that wrinkles or deformation occur when a steel plate is coiled, and the technical problem to be solved in the prior art is urgently needed.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention provides a rubber material for rubber telescopic sleeves, aiming at overcoming the defect that the whole strength and elasticity of the existing rubber telescopic sleeves cannot reach the use standard, so that wrinkles or deformation occur when a steel plate is coiled, and the reinforcing filling system and the vulcanization crosslinking system in the rubber material are matched with each other to generate a synergistic effect, so that the vulcanization time is greatly shortened, the product performance reduction caused by vulcanization reduction is prevented, and the prepared rubber telescopic sleeves are high in rigidity and good in elasticity.
The invention also provides a preparation method of the rubber telescopic sleeve, which comprises the steps of sequentially adding the components into an internal mixer for mixing, vulcanizing and filtering, so that the components are fully melted and dispersed, and the high consistency of the inner and outer layer materials of the telescopic sleeve is ensured; the automatic temperature control system is adopted to carry out long-time temperature rise and control, and the uniformity of the internal and external hardness of the telescopic sleeve is ensured.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the rubber material for the rubber telescopic sleeve comprises the following components in parts by weight:
as a further improvement of the invention, the anti-sulfuration reducing agent KA9188 is a Vulcure reducing agent produced by Langsheng company.
As a further improvement of the invention, a reinforcing filling system of the sizing material component is formed among the medium super wear-resistant carbon black N220, the channel carbon black and the semi-reinforcing carbon black N774, and a vulcanization crosslinking system of the sizing material component is formed by insoluble sulfur, an anti-vulcanization reducing agent KA9188 and an accelerator NS, wherein the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is 5-10%.
As a further improvement of the invention, when the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is less than 8%, the particle size ranges of the medium super wear-resistant carbon black N220, the channel carbon black and the semi-reinforcing carbon black N774 are respectively 10-20 nm, 30-50 nm and 50-90 nm so as to form reinforcing filling carbon black particles with graded particle sizes.
As a further improvement of the invention, the mass ratio of the insoluble sulfur to the anti-vulcanization reducing agent KA9188 in the vulcanization crosslinking system is not less than 1/5.
The rubber telescopic sleeve is prepared from the rubber material components.
The invention discloses a preparation method of a rubber telescopic sleeve, which adopts the rubber material components to prepare and comprises the following steps:
mixing natural rubber, an anti-aging agent, zinc oxide, stearic acid, coumarone resin, medium and super wear-resistant carbon black N220, channel carbon black and semi-reinforcing carbon black N774 at the temperature of 110-120 ℃ to obtain a section of masterbatch;
placing the primary rubber compound on a roller of an open mill, adding insoluble sulfur, a promoter NS and an anti-vulcanization reducer KA9188 for mixing after the surface of a rubber covered roller of the primary rubber compound is smooth, and obtaining a secondary rubber compound, wherein the secondary mixing temperature is 70-80 ℃;
step three, mixing at least 95% of insoluble sulfur, the accelerator NS and the anti-vulcanization reducer KA9188 into the first-stage masterbatch, then performing open-cut milling on the second-stage rubber compound, and standing the obtained rubber sheet for more than 12 hours;
winding the final rubber compound on a metal roller core for rubber coating to obtain a rubber roller, feeding the rubber coated metal roller core into a vulcanizing tank for vulcanization, controlling the vulcanization temperature to be 80-140 ℃ by adopting a stepped heating mode, controlling the pressure in the vulcanizing tank to be 0.45-0.5 MPa, and pulling out the rubber roller when the temperature in the vulcanizing tank is lower than 60 ℃;
and step five, after the rubber roller is naturally cooled to the room temperature, carrying out grinding processing, then hoisting the rubber roller and removing the metal roller core to obtain the rubber telescopic sleeve.
As a further improvement of the invention, the two-stage rubber compound obtained in the second step is filtered by a filter, three layers of 30-mesh, 60-mesh and 30-mesh filter screens are additionally arranged at the discharge port of the rubber filter, and the temperature of the filtered rubber compound is not more than 95 ℃.
As a further improvement of the invention, the four-step middle-step heating mode comprises the steps of heating ① from room temperature to 70-80 ℃ and preserving heat for at least 2h, heating ② from 70-80 ℃ to 100-110 ℃ and preserving heat for at least 1h, heating ③ from 100-110 ℃ to 120-130 ℃ and preserving heat for at least 1h, and heating ④ from 120-130 ℃ to 135-140 ℃ and preserving heat for at least 5-8 h.
As a further improvement of the invention, the temperature rise speed is not more than 25 ℃/h when the temperature rises from room temperature to 70-80 ℃, and the temperature rise speed is not more than 10 ℃/h when the temperature rises from 70-80 ℃ to 100-110 ℃, from 100-110 ℃ to 120-130 ℃ and from 120-130 ℃ to 135-140 ℃.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the rubber material for the rubber flexible sleeve adopts natural rubber as a base material, a reinforcing filling system of the rubber material component is formed among medium-ultra wear-resistant carbon black N220, channel-method carbon black and semi-reinforcing carbon black N774, and a vulcanization crosslinking system of the rubber material component is formed by insoluble sulfur, an anti-vulcanization reducing agent KA9188 and an accelerator NS; the natural rubber has excellent processing characteristics, the three carbon black materials are used as fillers to be filled in the natural rubber to ensure the high strength of the rubber material, and the vulcanization crosslinking system can effectively prevent the shortening of the vulcanization time and the occurrence of the vulcanization reduction phenomenon, thereby ensuring the comprehensive performance of the rubber material.
(2) According to the rubber material for the rubber telescopic sleeve, insoluble sulfur and the anti-vulcanization reducing agent KA9188 can be uniformly dispersed in a framework formed by carbon black, so that the flowability of the rubber material is improved, and a certain lubricating effect is achieved, so that the elasticity of the rubber material is further improved, and the balance between the hardness and the elasticity is achieved; in addition, the vulcanizing agents distributed in a dispersing way can be fully mixed with the base material to carry out a vulcanization reaction, and chemical cross-linking bonds are formed between the hydroxyl of the anti-vulcanization reducer KA9188 and the channel carbon black and the semi-reinforcing carbon black N774, so that the strength of the sizing material is improved.
(3) According to the rubber telescopic sleeve, the components are adopted for preparation, and the reinforcing filling system and the vulcanization crosslinking system are matched with each other to generate a synergistic effect, so that the vulcanization time is greatly shortened, and the reduction of the product performance caused by vulcanization reduction in the preparation process of the telescopic sleeve is prevented; the obtained rubber telescopic sleeve product has good elasticity and high rigidity, can effectively prevent the steel plate from wrinkling and deforming during coiling, has good service life and can be repeatedly used for a long time.
(4) According to the preparation method of the rubber telescopic sleeve, the components are sequentially added into an internal mixer for mixing, vulcanization and filtration, so that the components are fully melted and dispersed, and the high consistency of the inner and outer layer materials of the telescopic sleeve is ensured; the automatic temperature control system is adopted for long-time temperature rise and temperature control, the uniformity of the internal and external hardness of the telescopic sleeve is ensured, the occurrence of a vulcanization reduction phenomenon is prevented, the comprehensive performance of the produced rubber telescopic sleeve is good, and the use requirements of customers are met.
Detailed Description
For a further understanding of the contents of the present invention, reference will now be made in detail to the following examples.
Example 1
The rubber material for the rubber telescopic sleeve comprises the following components in parts by weight:
in the embodiment, the natural rubber is used as a base material, the natural rubber has good comprehensive performance, particularly has excellent processing characteristics and lower hysteresis loss, and the rubber roller needs to be formed by matching with the metal roller core in the preparation process of the rubber telescopic sleeve firstly, and then the telescopic sleeve is taken down from the roller core, so that the rubber material prepared from the rubber telescopic sleeve needs to have excellent processing characteristics to ensure stable and safe matching between the telescopic sleeve and the roller core and prevent the rubber sleeve from being torn in the taking-down process.
In the embodiment, a reinforcing filling system of the rubber compound component is formed among the super wear-resistant carbon black N220, the channel carbon black and the semi-reinforcing carbon black N774, the insoluble sulfur, the anti-vulcanization reducing agent KA9188 and the accelerator NS form a vulcanization crosslinking system of the rubber compound component, and the mass percentage of the vulcanization crosslinking system to the reinforcing filling system is 5% -10%.
The rubber telescopic sleeve is used for uncoiling a front-end steel coil and coiling a rear-end steel plate on a metallurgical production line, so that the rubber telescopic sleeve is required to have higher strength and good elasticity. In the embodiment, the three carbon blacks are adopted to form a reinforcing filling system of the rubber compound component, wherein the medium and ultra wear-resistant carbon black N220 is small in size, can keep good compatibility with surrounding matrix materials, has strong binding force with the matrix materials, can be used as a framework material to be filled in natural rubber to improve the overall hardness and strength of the rubber compound, but simultaneously, the medium and ultra wear-resistant carbon black N220 is not easy to deform to cause insufficient toughness when being filled as a filler, so that the elasticity of the rubber compound is reduced. In the embodiment, by adding the other two kinds of carbon black, namely the channel-method carbon black and the semi-reinforcing carbon black N774, the particle sizes of the two kinds of carbon black materials are relatively large relative to the particle size of the medium and super wear-resistant carbon black N220, so that the two kinds of carbon black materials are easy to deform and recover when being filled as a filler, the elasticity of the rubber material can be enhanced while the hardness and the strength of the rubber material are ensured, and the prepared rubber telescopic sleeve has good comprehensive performance.
Because this application designs the sizing material component to rubber expansion sleeve, rubber expansion sleeve belongs to thick goods, needs long-time vulcanization in the preparation process, however, although above-mentioned natural rubber has good processing characteristics, along with the extension of vulcanization time, can appear vulcanizing the reduction phenomenon, make rubber sleeve product property ability decline on the contrary. In order to prevent the vulcanization reduction phenomenon, insoluble sulfur is added into the rubber material component of the rubber telescopic sleeve in the embodiment, and the rubber telescopic sleeve has better dispersibility compared with common sulfur, can obviously shorten the vulcanization time, is easy to form a single sulfur bond, is not easy to oxidize and reduce, and has good aging resistance and stability.
Further, in this embodiment, the insoluble sulfur, the anti-vulcanization reducing agent KA9188, and the accelerator NS form a vulcanization crosslinking system of the rubber compound component, the insoluble sulfur and the anti-vulcanization reducing agent KA9188 serve as a vulcanizing agent of the rubber compound, the accelerator NS serves as a catalyst for promoting a vulcanization process, and the total amount of crosslinking bonds generated by the vulcanization system formed by the insoluble sulfur, the anti-vulcanization reducing agent KA9188, and the accelerator NS and the carbon black system is a total reaction generated in the rubber compound vulcanization process. In this embodiment, the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is 5% to 10%, preferably, the rubber composition of this embodiment includes 3 parts of insoluble sulfur, 1 part of accelerator NS, 1.2 parts of anti-reducing agent KA9188, 30 parts of medium-wear-resistant carbon black N220, 25 parts of channel black, and 20 parts of semi-reinforcing carbon black N774, and the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is 6.93%.
Preferably, in this embodiment, the mass percentage of the vulcanization crosslinking system to the reinforcing filling system is 6.93% and less than 8%, and the particle size ranges of the medium super wear-resistant carbon black N220, the channel carbon black and the semi-reinforcing carbon black N774 are 10 to 20nm, 30 to 50nm and 50 to 90nm, respectively, to form reinforcing filling carbon black particles with graded particle sizes.
The insoluble sulfur and the anti-sulfuration reducing agent KA9188 in this embodiment are in powder or crystal form, and the particle size is much smaller than the three carbon black materials. The mass ratio of the insoluble sulfur to the anti-sulfuration reducing agent KA9188 in the vulcanization crosslinking system is not less than 1/5, specifically in this embodiment, 3 parts of the insoluble sulfur and 1.2 parts of the anti-sulfuration reducing agent KA9188 respectively account for 15/26 and 3/13 of the vulcanization crosslinking system.
Because the insoluble sulfur has good dispersibility and the two vulcanizing agents have small sizes, the insoluble sulfur can be uniformly dispersed in a framework formed by the carbon black, the fluidity of the rubber material is improved, and a certain lubricating effect is achieved, so that the elasticity of the rubber material is further improved, and the hardness and the elasticity of the rubber material are balanced; in addition, the vulcanizing agents distributed in a dispersing way can be fully mixed with the base material to generate a vulcanization reaction, and chemical cross-linking bonds are formed between the hydroxyl of the anti-vulcanization reducer KA9188 and the channel carbon black and the semi-reinforcing carbon black N774, so that the strength of the sizing material is improved.
Therefore, the two material systems are matched with each other to generate a synergistic effect, so that the vulcanization time is greatly shortened, and the product performance reduction caused by vulcanization reduction in the preparation process of the telescopic sleeve is prevented.
Further, the embodiment provides a rubber telescopic sleeve prepared by adopting the rubber compound components. According to the design requirement of the formula, in the embodiment, the natural rubber is standard rubber No. 1, the carbon black is carbon black produced by Kabet, the anti-reducing agent KA9188 is a high-efficiency crosslinking agent produced by Langsheng corporation, the anti-aging agents are general anti-aging agents RD and 4010NA, the zinc oxide is indirect zinc oxide, and the stearic acid is commonly sold in the market.
The embodiment also provides a preparation method of the rubber telescopic sleeve, which is prepared by adopting the rubber material components and comprises the following steps:
firstly, plasticating natural rubber in an internal mixer for 95s, adding an anti-aging agent, zinc oxide, stearic acid and coumarone resin, mixing for 80s, adding medium super wear-resistant carbon black N220, channel carbon black and semi-reinforcing carbon black N774, mixing for 120s, lifting and bolting for 105s, and obtaining a section of masterbatch after the mixing temperature reaches 110-120 ℃, wherein the mixing temperature reaches 110 ℃ for rubber discharge in the embodiment;
placing the mixed masterbatch for not less than 24 hours, placing the primary masterbatch on a roller of an open mill, adding insoluble sulfur, an accelerator NS and an anti-vulcanization reducer KA9188 for mixing after the surface of a rubber covered roller of the masterbatch is smooth, and obtaining secondary rubber mixing, wherein the secondary mixing temperature is 70-80 ℃;
step three, mixing at least 95% of insoluble sulfur, the accelerator NS and the anti-vulcanization reducer KA9188 into a first-stage masterbatch, then performing open-cut turning on a second-stage rubber compound, thinly beating the rubber compound into 2 rolls and 3 triangular bags, and then discharging the rubber compound, wherein the rubber compound is used for the subsequent process after being parked for 12 hours;
in order to remove impurities in the rubber material and meet the requirements of the rubber telescopic sleeve on appearance quality and performance, the embodiment further utilizes a filter to filter two-stage rubber compound, specifically, a three-layer filter screen of 30 meshes, 60 meshes and 30 meshes is additionally arranged at a discharge port of the rubber filter, the temperature of the rubber filter is set to be 85 ℃, after preheating is carried out for 10 minutes, the rubber compound is fed into a feed port of the rubber filter to be filtered, the speed of the rubber filter is adjusted, and the temperature of the filtered rubber material is ensured not to exceed 95 ℃.
And step four, winding the final rubber compound on a metal roller core for rubber coating to obtain the rubber roller, specifically in the embodiment, feeding the filtered rubber compound into a screw extruder, extruding a rubber sheet with the thickness of 2.0mm and the width of 65mm, starting a rotary rubber coating machine after the rubber sheets are uniform, winding the rubber sheet on the metal roller core coated with the isolating agent in advance, winding and rubber coating layer by layer until the thickness of a single edge of the rubber coating reaches the thickness required by the process, and winding 2 layers of nylon water cloth on the rubber surface after the rubber coating is finished. Before the rubber material is fed into the screw extruder, the temperatures of a charging barrel, a screw and a machine head of the screw extruder are respectively preheated to 60 ℃, 50 ℃ and 60 ℃, and the temperature of the extruded rubber sheet is controlled to be less than or equal to 90 ℃ by controlling the rotating speed of the screw of the extruder in the rubber coating process.
Further, the encapsulated metal roller core is sent into a vulcanizing tank for vulcanization, the vulcanization temperature is controlled to be 80-140 ℃ by adopting a step-type temperature rise mode, the pressure in the vulcanizing tank is 0.45-0.5 MPa, and the rubber roller is pulled out when the temperature in the vulcanizing tank is lower than 60 ℃; specifically, the flexible sleeve after encapsulation is sent into a vulcanizing tank, after a tank door is closed, steam is introduced into the vulcanizing tank, vulcanization is carried out by adopting a mode of step-by-step temperature rise and heat preservation long-time vulcanization, a compressed air valve is opened while the steam is introduced, and compressed air is introduced to enable the pressure in the vulcanizing tank to reach 0.45MPa within half an hour; and after vulcanization, closing the air pressure valve and the steam valve, reducing the pressure, opening the safety pin to discharge steam when the pointer of the pressure gauge points to zero, and half opening the vulcanizing tank to reduce the temperature to be lower than 60 ℃ so as to pull out the rubber roller.
Preferably, the temperature rise and the heat preservation are controlled by a digital automatic temperature control system in the embodiment, and the step-type temperature rise mode is specifically that ① is heated from room temperature to 70 ℃ and is preserved for 2h, ② is heated from 70 ℃ to 100 ℃ and is preserved for 1h, ③ is heated from 100 ℃ to 120 ℃ and is preserved for 1h, ④ is heated from 120 ℃ to 135 ℃ and is preserved for at least 5h, in the embodiment, the temperature rise speed is 15 ℃/h when the temperature is raised from room temperature to 70 ℃, the temperature rise speed is 15 ℃/h when the temperature is raised from 70 ℃ to 100 ℃, the temperature is raised from 100 ℃ to 120 ℃ and the temperature rise speed is 10 ℃/h when the temperature is raised from 120 ℃ to 135 ℃.
And (3) performing grinding processing on the cooled rubber roller on a lathe to enable the outer diameter, the length and the surface roughness of the telescopic sleeve to reach specified values, and then hoisting and taking out the metal roller core to produce the rubber telescopic sleeve. According to the preparation method of the rubber telescopic sleeve, the components are sequentially added into an internal mixer for mixing, vulcanization and filtration, so that the components are fully blended and dispersed, and the high consistency of the inner and outer layer materials of the telescopic sleeve is ensured; the automatic temperature control system is adopted for long-time temperature rise and temperature control, the uniformity of the hardness of the inner part and the outer part of the telescopic sleeve is ensured, the occurrence of the vulcanization reduction phenomenon is prevented, the comprehensive performance of the produced rubber telescopic sleeve is good, and the use requirements of customers are met.
The material performance test data of the rubber material for the rubber telescopic sleeve is shown in table 1, the rubber material for the rubber telescopic sleeve has good elasticity, high stress at definite elongation and high compression modulus, so that the rubber material has excellent production process performance and is beneficial to the subsequent preparation of the rubber telescopic sleeve.
TABLE 1
| Hardness (Shao's A) | 79 |
| Tensile Strength (MPa) | 21 |
| Elongation (%) | 350 |
| 100% stress at definite elongation (MPa) | 7.1 |
| Rebound (%) | 41 |
| Modulus of compression (MPa) 10% | 11.2 |
Example 2
The rubber material for the rubber telescopic sleeve in the embodiment basically comprises the following components in parts by weight:
in this embodiment, the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is 5% to 10%, preferably, the sizing material component of this embodiment includes 2 parts of insoluble sulfur, 1.5 parts of accelerator NS, 2 parts of anti-reducing agent KA9188, 35 parts of medium super wear-resistant carbon black N220, 30 parts of channel black and 15 parts of semi-reinforcing carbon black N774, and the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is 6.88%.
In this embodiment, the mass ratio of the insoluble sulfur to the anti-sulfidation reducing agent KA9188 in the sulfidation crosslinking system is not less than 1/5, and specifically, in this embodiment, 2 parts of the insoluble sulfur and 2 parts of the anti-sulfidation reducing agent KA9188 respectively account for 4/11 and 4/11 of the sulfidation crosslinking system.
The embodiment also provides a preparation method of the rubber expansion sleeve, which adopts the rubber material components for preparation, and the preparation steps are basically the same as those of the embodiment 1, except that:
firstly, plasticating natural rubber in an internal mixer for 100s, then adding an anti-aging agent, zinc oxide, stearic acid and coumarone resin for mixing for 80s, finally adding medium super wear-resistant carbon black N220, channel carbon black and semi-reinforcing carbon black N774 for mixing for 120s, then lifting and bolting for 105s, and obtaining a section of masterbatch after the mixing temperature reaches 110-120 ℃, wherein the mixing temperature reaches 120 ℃ for rubber discharge in the embodiment;
placing the mixed masterbatch for not less than 24 hours, placing the primary masterbatch on a roller of an open mill, adding insoluble sulfur, an accelerator NS and an anti-vulcanization reducer KA9188 for mixing after the surface of a rubber covered roller of the masterbatch is smooth, and obtaining secondary rubber mixing, wherein the secondary mixing temperature is 70-80 ℃;
step three, after insoluble sulfur, an accelerator NS and an anti-vulcanization reducer KA9188 are all mixed into a primary rubber, opening and turning over the secondary rubber compound, thinly beating the rubber compound into 2 rolls and 3 triangular bags, then discharging the rubber pieces, and standing the rubber pieces for 12 hours for later working procedures;
and step four, winding the final rubber compound on a metal roller core for rubber coating to obtain the rubber roller, specifically in the embodiment, feeding the filtered rubber compound into a screw extruder, extruding a rubber sheet with the thickness of 2.0mm and the width of 65mm, starting a rotary rubber coating machine after the rubber sheets are uniform, winding the rubber sheet on the metal roller core coated with the isolating agent in advance, winding and rubber coating layer by layer until the thickness of a single edge of the rubber coating reaches the thickness required by the process, and winding 2 layers of nylon water cloth on the rubber surface after the rubber coating is finished. Before the rubber material is fed into the screw extruder, the temperatures of a charging barrel, a screw and a machine head of the screw extruder are respectively preheated to 60 ℃, 50 ℃ and 60 ℃, and the temperature of the extruded rubber sheet is controlled to be less than or equal to 90 ℃ by controlling the rotating speed of the screw of the extruder in the rubber coating process.
Further, the encapsulated metal roller core is conveyed into a vulcanizing tank for vulcanization, the vulcanization temperature is controlled to be 80-140 ℃ by adopting a step-type temperature rise mode, the pressure in the vulcanizing tank is 0.48MPa, and the rubber roller is pulled out when the temperature in the vulcanizing tank is 50 ℃.
Preferably, the temperature rise and the heat preservation are controlled by a digital automatic temperature control system in the embodiment, and the stepped temperature rise mode is specifically that ① is heated from room temperature to 80 ℃ and is preserved for 2 hours, ② is heated from 80 ℃ to 110 ℃ and is preserved for 1 hour, ③ is heated from 110 ℃ to 130 ℃ and is preserved for 1 hour, ④ is heated from 130 ℃ to 140 ℃ and is preserved for at least 5 hours, in the embodiment, the temperature rise speed is 15 ℃/h when the temperature is raised from room temperature to 80 ℃, the temperature rise speed is 15 ℃/h when the temperature is raised from 80 ℃ to 110 ℃, the temperature rise speed is 110 ℃ to 130 ℃ and the temperature rise speed is 10 ℃/h when the temperature is raised from 130 ℃ to 140 ℃, the cooled rubber roller is subjected to grinding processing on a lathe, the outer diameter, the length and the surface roughness of the expansion sleeve reach specified values, and then the metal roller core is hoisted and taken out, so.
The material performance test data of the rubber material for the rubber telescopic sleeve is shown in table 2, the rubber material for the rubber telescopic sleeve is good in elasticity, high in stress at definite elongation and excellent in production process performance, the rubber telescopic sleeve obtained by using the rubber material components and the preparation method is high in rigidity and easy to recover, and the use requirement and the service life of the rubber telescopic sleeve meet the requirements of customers.
TABLE 2
| Hardness (Shao's A) | 81 |
| Tensile Strength (MPa) | 22 |
| Elongation (%) | 338 |
| 100% stress at definite elongation (MPa) | 7.5 |
| Rebound (%) | 39 |
| Modulus of compression (MPa) 10% | 12.6 |
Example 3
The rubber material for the rubber telescopic sleeve in the embodiment basically comprises the following components in parts by weight:
in this embodiment, the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is 5% to 10%, preferably, the rubber composition of this embodiment includes 1.5 parts of insoluble sulfur, 2 parts of accelerator NS, 2.5 parts of anti-reducing agent KA9188, 40 parts of medium super wear-resistant carbon black N220, 20 parts of channel black and 10 parts of semi-reinforcing carbon black N774, and the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is 8.57%.
In this embodiment, the mass ratio of the insoluble sulfur to the anti-sulfidation reducing agent KA9188 in the sulfidation crosslinking system is not less than 1/5, and specifically, in this embodiment, 2 parts of the insoluble sulfur and 2 parts of the anti-sulfidation reducing agent KA9188 respectively account for 4/11 and 4/11 of the sulfidation crosslinking system.
The preparation method of the rubber expansion sleeve of the embodiment adopts the rubber material components for preparation, and the preparation steps are basically the same as those of the embodiment 1, except that:
placing natural rubber in an internal mixer for plasticating for 100s, then adding an anti-aging agent, zinc oxide, stearic acid and coumarone resin for mixing for 70s, finally adding medium super wear-resistant carbon black N220, channel carbon black and semi-reinforcing carbon black N774 for mixing for 125s, then carrying out lifting and bolting for 110s, and discharging rubber when the mixing temperature reaches 120 ℃;
placing the mixed masterbatch for not less than 24 hours, placing the primary masterbatch on a roller of an open mill, adding insoluble sulfur, an accelerator NS and an anti-vulcanization reducer KA9188 for mixing after the surface of a rubber covered roller of the masterbatch is smooth, and obtaining secondary rubber mixing, wherein the secondary mixing temperature is 70-80 ℃;
step three, mixing at least 95% of insoluble sulfur, the accelerator NS and the anti-vulcanization reducer KA9188 into a first-stage masterbatch, then performing open-cut turning on a second-stage rubber compound, thinly beating 3 rolls and 3 triangular bags of the rubber compound, and then discharging the rubber compound, wherein the rubber compound is used for the subsequent process after being parked for 12 hours;
and step four, winding the final rubber compound on a metal roller core for rubber coating to obtain the rubber roller, specifically in the embodiment, feeding the filtered rubber compound into a screw extruder, extruding a rubber sheet with the thickness of 3.0mm and the width of 65mm, starting a rotary rubber coating machine after the rubber sheets are uniform, winding the rubber sheet on the metal roller core coated with the isolating agent in advance, winding and rubber coating layer by layer until the thickness of a single edge of the rubber coating reaches the thickness required by the process, and winding 2 layers of nylon water cloth on the rubber surface after the rubber coating is finished.
Further, the encapsulated metal roller core is conveyed into a vulcanizing tank for vulcanization, the vulcanization temperature is controlled to be 80-140 ℃ by adopting a step-type temperature rise mode, the pressure in the vulcanizing tank is 0.5MPa, and the rubber roller is pulled out when the temperature in the vulcanizing tank is lower than 60 ℃.
Preferably, the temperature rise and the heat preservation are controlled by a digital automatic temperature control system in the embodiment, and the stepwise temperature rise mode is specifically that ① is heated from room temperature to 75 ℃ and is preserved for 3 hours, ② is heated from 75 ℃ to 105 ℃ and is preserved for 2 hours, ③ is heated from 105 ℃ to 125 ℃ and is preserved for 2 hours, ④ is heated from 125 ℃ to 135 ℃ and is preserved for 8 hours, in the embodiment, the temperature rise speed is 20 ℃/h when the temperature rises from room temperature to 75 ℃, the temperature rise speed is 20 ℃/h when the temperature rises from 75 ℃ to 105 ℃, the temperature rise speed is 125 ℃ and the temperature rise speed is 8 ℃/h when the temperature rises from 125 ℃ to 135 ℃, the cooled rubber roller is ground on a lathe, the outer diameter, the length and the surface roughness of the expansion sleeve reach specified values, and then the metal roller core is lifted and taken out, so that the rubber expansion sleeve is produced.
The rubber material for the rubber telescopic sleeve of the embodiment has the material performance test data shown in table 3, and the rubber telescopic sleeve obtained by using the rubber material components and the preparation method is subjected to appearance and size inspection, and meets the relevant requirements of the drawing. The embodiment breaks through the formula development and the production process, the product has good appearance, size and hardness consistency, and meets the technical standard and the use requirement.
TABLE 3
| Hardness (Shao's A) | 80 |
| Tensile Strength (MPa) | 20 |
| Elongation (%) | 345 |
| 100% stress at definite elongation (MPa) | 7.7 |
| Rebound (%) | 40 |
| Modulus of compression (MPa) 10% | 11.9 |
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A rubber material for a rubber telescopic sleeve is characterized in that: comprises the following components in percentage by weight:
2. the compound for rubber elastic sleeves according to claim 1, wherein: the anti-sulfuration reducing agent KA9188 is a Vulcure reducing agent produced by Langsheng company.
3. The compound for rubber elastic sleeves according to claim 1, wherein: a reinforcing filling system of the sizing material component is formed among the medium and super wear-resistant carbon black N220, the channel carbon black and the semi-reinforcing carbon black N774, the insoluble sulfur, the anti-vulcanization reducing agent KA9188 and the accelerator NS form a vulcanization crosslinking system of the sizing material component, and the mass percentage of the vulcanization crosslinking system to the reinforcing filling system is 5-10%.
4. A rubber compound for a rubber elastic sleeve according to claim 3, wherein: when the mass percentage of the vulcanization crosslinking system and the reinforcing filling system is less than 8%, the particle size ranges of the medium super wear-resistant carbon black N220, the channel carbon black and the semi-reinforcing carbon black N774 are respectively 10-20 nm, 30-50 nm and 50-90 nm so as to form reinforcing filling carbon black particles with graded particle sizes.
5. A rubber compound for a rubber elastic sleeve according to claim 3, wherein: the mass ratio of the insoluble sulfur to the anti-vulcanization reducing agent KA9188 in the vulcanization crosslinking system is not less than 1/5.
6. A rubber telescopic sleeve is characterized in that: prepared by using the sizing component of any one of claims 1 to 5.
7. A preparation method of a rubber telescopic sleeve is characterized by comprising the following steps: the rubber composition as claimed in any of claims 1 to 5, which is prepared by the following steps:
mixing natural rubber, an anti-aging agent, zinc oxide, stearic acid, coumarone resin, medium and super wear-resistant carbon black N220, channel carbon black and semi-reinforcing carbon black N774 at the temperature of 110-120 ℃ to obtain a section of masterbatch;
step two, placing the primary rubber compound on a roller of an open mill, adding insoluble sulfur, an accelerator NS and an anti-vulcanization reducer KA9188 for mixing after the surface of a rubber covered roller of the primary rubber compound is smooth, and obtaining a secondary rubber compound, wherein the secondary mixing temperature is 70-80 ℃;
step three, mixing at least 95% of insoluble sulfur, the accelerator NS and the anti-vulcanization reducer KA9188 into the primary rubber, then performing open-cut milling on the secondary rubber compound, and standing the obtained rubber sheet for more than 12 hours;
winding the final rubber compound on a metal roller core for rubber coating to obtain a rubber roller, feeding the rubber coated metal roller core into a vulcanizing tank for vulcanization, controlling the vulcanization temperature to be 80-140 ℃ by adopting a stepped heating mode, controlling the pressure in the vulcanizing tank to be 0.45-0.5 MPa, and pulling out the rubber roller when the temperature in the vulcanizing tank is lower than 60 ℃;
and step five, after the rubber roller is naturally cooled to the room temperature, carrying out grinding processing, then hoisting the rubber roller and removing the metal roller core to obtain the rubber telescopic sleeve.
8. The method for producing a rubber elastic sheath according to claim 7, characterized in that: and (3) filtering the two-stage rubber compound obtained in the step (II) by using a filter machine, wherein three layers of 30-mesh, 60-mesh and 30-mesh filter screens are additionally arranged at a discharge port of the filter machine, and the temperature of the filtered rubber compound is not more than 95 ℃.
9. The method for preparing the rubber expansion sleeve as claimed in claim 7, wherein the four-step heating manner comprises the steps of heating ① from room temperature to 70-80 ℃ and keeping the temperature for at least 2 hours, heating ② from 70-80 ℃ to 100-110 ℃ and keeping the temperature for at least 1 hour, heating ③ from 100-110 ℃ to 120-130 ℃ and keeping the temperature for at least 1 hour, and heating ④ from 120-130 ℃ to 135-140 ℃ and keeping the temperature for at least 5-8 hours.
10. The method for manufacturing a rubber elastic sheath according to claim 9, characterized in that: the temperature rise speed is not more than 25 ℃/h when the temperature rises from room temperature to 70-80 ℃, and the temperature rise speed is not more than 10 ℃/h when the temperature rises from 70-80 ℃ to 100-110 ℃, the temperature rises from 100-110 ℃ to 120-130 ℃ and the temperature rises from 120-130 ℃ to 135-140 ℃.
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