Fuel hose and preparation method thereof

Abstract

The invention belongs to the technical field of rubber products, and particularly relates to a fuel rubber tube and a preparation method thereof. The fuel hose comprises the following raw materials in parts by weight: 70-90 parts of fluororubber, 10-30 parts of fluororesin, 6-10 parts of a solubilizer, 4-8 parts of an anti-aging agent, 8-12 parts of a reinforcing agent, 2-5 parts of a vulcanization accelerator and 10-14 parts of stearic acid. The fuel hose has the beneficial effects that the fuel hose has excellent high-temperature resistance, fuel permeation resistance and aging resistance, has excellent flexibility, and comprehensively meets the strict requirements of modern industry on high-performance fuel hoses.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rubber products, and particularly relates to a fuel rubber hose and a preparation method thereof. BACKGROUND

[0002] In the fuel delivery system of modern transportation tools such as automobiles and airplanes, fuel rubber hoses play a key role. With the continuous innovation of engine technology, the temperature in the engine compartment is increasingly high, and the composition and performance of fuel are more complex, which puts forward strict requirements on the comprehensive performance of fuel rubber hoses.

[0003] At present, the commonly used materials of fuel rubber hoses include nitrile rubber and single fluorine rubber. Nitrile rubber is widely used in the manufacture of fuel rubber hoses due to its low cost. However, its heat resistance is poor, and when the environmental temperature exceeds 120 DEG C, swelling phenomenon occurs, resulting in poor dimensional stability of the hose. At the same time, under the long-term erosion of high-concentration fuel, rapid aging occurs, and the mechanical properties decrease sharply, resulting in a significant increase in fuel permeation risk. Fluorine rubber is known for its excellent high-temperature resistance (it can be used in a high-temperature environment of 250 DEG C for a long time) and oil resistance, and to some extent, it meets the use requirements in high-temperature and high-oil environments. However, the flexibility of the single fluorine rubber hose is poor. In a complex fuel pipeline system, the hose needs to be frequently bent to adapt to different installation positions and directions, at which time the single fluorine rubber hose is prone to stress concentration at the bending part, thereby causing cracking and affecting the normal operation of the entire fuel system. For example, in the fuel pipeline of an aviation engine, the pipeline arrangement is complex, and the flexibility of the hose is extremely high, so the single fluorine rubber hose cannot meet the requirements.

[0004] In addition, in the preparation process of the existing fuel rubber hose, different rubber materials are simply blended. However, due to the differences in molecular structure and polarity between different rubber materials, uniform dispersion is difficult to achieve during blending, the advantages of each material cannot be fully utilized, and the performance of the hose is unstable, and there is a large difference between batches. For example, when fluorine rubber is blended with other rubbers, phase separation phenomenon easily occurs during processing due to the difference in polarity between the two, resulting in uneven internal structure of the hose, thereby seriously affecting the overall performance of the hose.

[0005] In view of the many problems existing in the prior art, it is necessary to develop a new material combination and optimize the preparation process to significantly improve the comprehensive performance of the fuel rubber hose, which has become a key problem to be solved in the current field. SUMMARY

[0006] The application provides a fuel rubber hose and a preparation method thereof, and aims to solve the problems of poor high-temperature resistance, poor aging resistance and poor flexibility of the existing fuel rubber hose.

[0007] The first aspect of the present application provides a fuel hose comprising the following raw materials by weight: 70-90 parts of fluoroelastomer, 10-30 parts of fluororesin, 6-10 parts of solubilizer, 4-8 parts of antioxidant, 8-12 parts of reinforcing agent, 2-5 parts of vulcanization accelerator and 10-14 parts of stearic acid.

[0008] According to some embodiments of the fuel hose described in the present application, the mass ratio of the fluoroelastomer and the fluororesin is 80-85: 15-20.

[0009] According to some embodiments of the fuel hose described in the present application, the fluoroelastomer comprises one or more of vinylidene fluoride and hexafluoropropylene copolymer, vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene terpolymer, vinylidene fluoride and chlorotrifluoroethylene copolymer, vinylidene fluoride and perfluoro (alkyl vinyl ether) copolymer, tetrafluoroethylene and perfluoro (alkyl vinyl ether) copolymer.

[0010] According to some embodiments of the fuel hose described in the present application, the fluororesin comprises THV fluororesin.

[0011] According to some embodiments of the fuel hose described in the present application, the solubilizer comprises fluorine-based alkyl polyether modified polysiloxane.

[0012] According to some embodiments of the fuel hose described in the present application, the antioxidant comprises antioxidant RD.

[0013] According to some embodiments of the fuel hose described in the present application, the reinforcing agent comprises white carbon black.

[0014] According to some embodiments of the fuel hose described in the present application, the vulcanization accelerator comprises 2,5-dimethyl-2,5-bis (tert-butyl peroxy) hexane and triallyl isocyanurate.

[0015] According to some embodiments of the fuel hose described in the present application, the mass ratio of 2,5-dimethyl-2,5-bis (tert-butyl peroxy) hexane and triallyl isocyanurate is (4-8): (6-10).

[0016] The second aspect of the present application provides a preparation method of the fuel hose described in the first aspect of the present application, comprising the following steps:

[0017] (1) mixing fluoroelastomer, solubilizer, antioxidant, reinforcing agent and stearic acid for first mixing to obtain a mixture;

[0018] (2) mixing the mixture and fluororesin for second mixing to obtain a fluoroelastomer mixture;

[0019] (3) mixing the fluoroelastomer mixture and vulcanization accelerator for thin pass mixing to obtain a fluoroelastomer base;

[0020] (4) extruding and vulcanizing the fluoroelastomer base material in sequence to obtain the fuel hose.

[0021] According to some embodiments of the method for preparing the fuel hose, in step (1), the temperature of the first mixing is 50-70℃, and the time of the first mixing is 15-25min.

[0022] According to some embodiments of the method for preparing the fuel hose, in step (2), the temperature of the second mixing is 40-70℃, the pressure of the second mixing is 0.5-0.8MPa, and the time of the second mixing is 15-20min.

[0023] According to some embodiments of the method for preparing the fuel hose, in step (3), the temperature of the thin-pass mixing is 50-70℃, and the time of the thin-pass mixing is 10-20min.

[0024] According to some embodiments of the method for preparing the fuel hose, in step (4), the vulcanization is performed in two stages, including a first vulcanization and a second vulcanization.

[0025] According to some embodiments of the method for preparing the fuel hose, the temperature of the first vulcanization is 165-175℃, the pressure of the first vulcanization is 10-15MPa, and the time of the first vulcanization is 27-33min.

[0026] According to some embodiments of the method for preparing the fuel hose, the temperature of the second vulcanization is 175-185℃, and the time of the second vulcanization is 120-240min.

[0027] The fuel hose has excellent high-temperature resistance, fuel permeation resistance, and aging resistance, and has excellent flexibility, thereby meeting the strict requirements of modern industry for high-performance fuel hoses. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and the examples of the embodiments are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0029] In the present disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", "fourth", "fifth", "sixth", etc. do not necessarily mean "one", "two", "three", "four", "five", "six", etc. respectively. Rather, these terms can be used interchangeably and thus be employed to indicate either incidence relation of the objects or to differentiate one claim from another.

[0030] The fuel hose provided by the embodiments of the present disclosure comprises the following raw materials in the following weight parts: 70-90 parts of fluoro rubber, 10-30 parts of fluororesin, 6-10 parts of solubilizer, 4-8 parts of antioxidant, 8-12 parts of reinforcing agent, 2-5 parts of vulcanization accelerator, and 10-14 parts of stearic acid.

[0031] The fuel hose provided by the embodiments of the present disclosure comprises the following raw materials in the following weight parts: 70-90 parts of fluoro rubber, 10-30 parts of fluororesin, 6-10 parts of solubilizer, 4-8 parts of antioxidant, 8-12 parts of reinforcing agent, 2-5 parts of vulcanization accelerator, and 10-14 parts of stearic acid.

[0032] The stearic acid mainly plays the role of softening agent, reduces the hardness of the rubber compound, improves the processing performance of the rubber compound, enables the components to be more uniformly mixed, and improves the production efficiency and product quality.

[0033] In some embodiments of the present disclosure, the mass ratio of the fluoro rubber and the fluororesin is 80-85:15-20; for example, 80:15, 80:20, 85:15, 85:20, etc.

[0034] In some embodiments of the present disclosure, the fluoro rubber comprises one or more of the following: vinylidene fluoride and hexafluoropropylene copolymer, vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene terpolymer, vinylidene fluoride and chlorotrifluoroethylene copolymer, vinylidene fluoride and perfluoro(alkyl vinyl ether) copolymer, and tetrafluoroethylene and perfluoro(alkyl vinyl ether) copolymer. The fluoro rubber has excellent high-temperature resistance and can work stably for a long time in a high-temperature environment of 250℃. Meanwhile, the fluoro rubber has extremely strong resistance to corrosion of various types of fuel, thereby providing a solid high-temperature resistance and oil resistance foundation for the fuel hose.

[0035] In some embodiments of the present disclosure, the fluororesin comprises THV fluororesin. The unique molecular configuration of the fluororesin endows it with good flexibility and extremely low permeability. The combination of the fluororesin and the fluoro rubber can effectively improve the flexibility of the whole hose, greatly reduce the fuel permeability, and further enhance the safety of the hose in use.

[0036] In some embodiments of the present application, the solubilizer comprises fluorine-based alkyl polyether modified polysiloxane. The addition of the solubilizer can improve the flowability and plasticity of the rubber compound during processing, making the rubber compound easier to shape, while significantly improving the flexibility of the finished fuel hose, allowing it to be easily bent during complex pipeline installation, reducing stress concentration.

[0037] In some embodiments of the present application, the anti-aging agent comprises anti-aging agent RD. The anti-aging agent can effectively inhibit the aging of the rubber material caused by factors such as heat, oxidation, and light during long-term use, greatly extending the service life of the fuel hose and ensuring its stable and reliable performance after long-term use.

[0038] In some embodiments of the present application, the reinforcing agent comprises white carbon black. The reinforcing agent can significantly enhance the strength and wear resistance of the hose, allowing it to maintain good physical properties and not be easily damaged when subjected to high-pressure fuel delivery and friction.

[0039] In some embodiments of the present application, the vulcanization accelerator comprises 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane and triallyl isocyanurate. The vulcanization accelerator can significantly improve the rate and effect of the vulcanization reaction, making the cross-linked structure of the hose more perfect, thereby optimizing the physical properties of the hose, such as increasing the strength, hardness, and fatigue resistance.

[0040] In some embodiments of the present application, the mass ratio of 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane and triallyl isocyanurate is (4-8):(6-10), such as 4:6, 4:8, 4:10, 5:6, 5:9, 5:10, 8:6, 8:7, 8:10, etc.

[0041] The embodiments of the present application also provide a preparation method of the fuel hose of the first aspect of the present application, comprising the following steps:

[0042] (1) mixing fluorine rubber, solubilizer, anti-aging agent, reinforcing agent, and stearic acid for first mixing to obtain a mixed material;

[0043] (2) mixing the mixed material and fluorine resin for second mixing to obtain a fluorine rubber mixture;

[0044] (3) mixing the fluorine rubber mixture and vulcanization accelerator for thin pass mixing to obtain a fluorine rubber base;

[0045] (4) sequentially performing extrusion molding and vulcanization treatment on the fluorine rubber base to obtain the fuel hose.

[0046] The preparation method described in the present application adopts a phased and precise temperature and pressure control method. First, the fluoroelastomer and different additives are mixed and plasticized, and finally the fluororesin is added and mixed at high temperature and high pressure; the preparation method described in the present application can ensure uniform dispersion of each component in the rubber compound, enhance the interaction between the materials, greatly improve the stability of the performance of the rubber tube, and reduce the batch difference of the product performance.

[0047] In some embodiments of the present application, the fluoroelastomer is pretreated before the first mixing. The fluoroelastomer is placed on an open mill for thin pass operation, and the number of thin passes is set to 15-20 times. Through thin pass treatment, the plasticity of the fluoroelastomer becomes more uniform, which is beneficial to the subsequent mixing with other components and improves the mixing effect. At the same time, the fluororesin is dried in an oven at 80-100°C for 3-4 hours to completely remove the moisture therein. The presence of moisture can produce bubbles during processing, affecting the quality of the rubber tube, so drying treatment is an important link to ensure product quality.

[0048] In some embodiments of the present application, in step (1), the temperature of the first mixing is 50-70°C, such as 50°C, 60°C, 70°C, etc., and the time of the first mixing is 15-25 min, such as 15 min, 18 min, 20 min, 25 min, etc.

[0049] In some embodiments of the present application, in step (2), the temperature of the second mixing is 40-70°C, such as 40°C, 50°C, 60°C, 70°C, etc., the pressure of the second mixing is 0.5-0.8 MPa, such as 0.5 MPa, 0.6 MPa, 0.8 MPa, etc., and the time of the second mixing is 15-20 min, such as 15 min, 18 min, 20 min, etc.

[0050] In some embodiments of the present application, the pretreated fluoroelastomer is put into an internal mixer, the temperature of the internal mixer is raised to 40-50°C, and plasticizing operation is performed for 3-5 min to preliminarily soften the fluoroelastomer, facilitating the mixing of the subsequent additives. Then, the solubilizing agent, antioxidant RD, and stearic acid are sequentially added and mixed for 5-8 min to make these additives fully dispersed in the fluoroelastomer. Subsequently, the reinforcing agent is added. Since the reinforcing effect of the reinforcing agent is strong, it needs a longer mixing time to be uniformly dispersed, so the mixing time of this step is set to 8-10 min. Finally, the fluororesin is added, the pressure of the internal mixer is controlled at 0.5-0.8 MPa, the temperature is further raised to 50-70°C, and mixing is performed for 15-20 min. Through the high temperature and high pressure environment, the fluoroelastomer and the fluororesin are fully fused to form a uniform fluoroelastomer mixture.

[0051] In some embodiments of the present application, in step (3), the temperature of the thin-pass mixing is 50-70℃, such as 50℃, 60℃, 70℃, etc., and the time of the thin-pass mixing is 10-20min.

[0052] In some embodiments of the present application, the mixed fluororubber mixture is transferred from the internal mixer to the open mill, and the vulcanization accelerator is added when the temperature of the fluororubber mixture is reduced to 60-70℃, followed by thin-pass mixing operation, with 15-20 times of thin-pass mixing. Through thin-pass mixing, the vulcanization accelerator is uniformly dispersed in the fluororubber mixture, fully preparing for the subsequent vulcanization reaction, and obtaining the fluororubber base material that can be used for vulcanization molding.

[0053] In some embodiments of the present application, the prepared fluororubber base material is put into the extruder and extruded through a specially designed fuel hose mold. During the extrusion molding process, the temperature of each section of the extruder is accurately controlled: the head temperature is set to 100-120℃, which can make the rubber maintain good fluidity during extrusion and smoothly pass through the mold; the extrusion section temperature is controlled to 90-110℃, which helps to further plasticize the rubber and make it more uniform; the plasticizing section temperature is controlled to 80-100℃, which ensures that the rubber is fully plasticized; the screw section temperature is controlled to 70-90℃, which maintains the stability of the rubber during screw conveying. At the same time, the extrusion speed is controlled at 10-15m / min, which can ensure the production efficiency and the forming quality of the rubber pipe blank, and obtain the preliminarily formed rubber pipe blank.

[0054] In some embodiments of the present application, in step (4), the vulcanization treatment is carried out in two stages, including first vulcanization treatment and second vulcanization treatment.

[0055] In some embodiments of the present application, the temperature of the first vulcanization treatment is 165-175℃, such as 165℃, 168℃, 170℃, 175℃, etc., the pressure of the first vulcanization treatment is 10-15MPa, such as 10MPa, 12MPa, 15MPa, etc., and the time of the first vulcanization treatment is 27-33min, such as 27min, 30min, 33min, etc.

[0056] In some embodiments of the present application, the temperature of the second vulcanization treatment is 175-185℃, such as 175℃, 178℃, 180℃, 182℃, 185℃, etc., and the time of the second vulcanization treatment is 120-240min, such as 120min, 160min, 240min, etc. The preparation method described in the present application divides the vulcanization treatment into two stages, first, the high-temperature and high-pressure first vulcanization treatment makes the rubber tube preliminarily crosslink and set, and quickly forms a basic structure; and then, the low-temperature and long-time second vulcanization treatment further improves the crosslinking structure of the rubber tube. Dividing the vulcanization treatment into two stages can make the molecular structure of the rubber tube more compact and stable, and significantly improve the comprehensive performance of the rubber tube, such as strength, heat resistance, oil resistance, etc.

[0057] In some embodiments of the present application, the first vulcanization treatment is carried out on a flat vulcanization machine, and in this stage, the fuel rubber tube blank preliminarily crosslinks and sets to form a basic physical structure. The second vulcanization treatment is carried out in a hot air circulating oven, and through the second vulcanization treatment, the crosslinking degree of the fuel rubber tube is further improved, the molecular structure of the fuel rubber tube is perfected, the performance of the fuel rubber tube is more stable, and the high-temperature resistance, oil resistance, aging resistance, etc. of the fuel rubber tube are improved. After the vulcanization is completed, the fuel rubber tube is cooled to reduce the temperature to room temperature, and the physical properties of the rubber tube are stabilized. Then, according to the actual use requirements, the rubber tube is cut to a fixed length to ensure that the length of the rubber tube meets the standard. Finally, the burrs on the surface of the rubber tube are carefully removed, and appearance and size inspection is carried out to ensure that the quality of the rubber tube meets the requirements, and after the inspection is qualified, the rubber tube is packaged and stored.

[0058] The technical solutions of the present application are further described below in conjunction with embodiments.

[0059] Embodiment 1

[0060] A preparation method of a fuel rubber tube, comprising the following steps:

[0061] (1) According to the weight parts, 85 parts of ordinary 26 type fluorine rubber, 15 parts of THV fluorine resin, 8 parts of fluorine-based alkyl polyether modified polysiloxane, 6 parts of antioxidant RD, 10 parts of white carbon black, 3 parts of triallyl isocyanurate, 2 parts of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, and 12 parts of stearic acid are weighed.

[0062] (2) The ordinary 26 type fluorine rubber and THV fluorine resin are pretreated: the ordinary 26 type fluorine rubber is placed on an open mill for thin pass operation, and the thin pass number is set to 20 times; the THV fluorine resin is placed in a 90℃ oven and dried for 3h.

[0063] (3) Put the pretreated common 26 type fluorine rubber into the internal mixer, and increase the temperature of the internal mixer to 50℃, and perform plastication operation, and the time is controlled to be 10 min. Then, sequentially add the solubilizer, anti-aging agent RD and stearic acid in sequence, and continue to mix for 8 min, so that the additives are fully dispersed in the fluorine rubber. Then, add the reinforcing agent white carbon black, and mix for 10 min. Then, add the THV fluororesin, and control the pressure of the internal mixer to be 0.8 MPa, and increase the temperature to 70℃, and mix for 15 min, so that the fluorine rubber and the fluororesin are fully fused in the high temperature and high pressure environment, and a uniform fluorine rubber mixture is formed.

[0064] (4) Transfer the fluorine rubber mixture from the internal mixer to the open mill, and when the temperature of the fluorine rubber mixture decreases to 60℃, add the vulcanization accelerator, and then perform thin pass mixing operation, and the thin pass number is 20, so that the fluorine rubber base material is obtained.

[0065] (5) Put the fluorine rubber base material into the extruder, and extrude and form through the fuel hose die. In the extrusion forming process, the temperature of each section of the extruder is controlled: the temperature of the head is set to 115℃, the temperature of the extrusion section is set to 105℃, the temperature of the plasticizing section is set to 105℃, and the temperature of the screw section is set to 100℃, and at the same time, the extrusion speed is controlled to be 10 m / min, so that the hose blank is obtained.

[0066] (6) Place the hose blank on the flat vulcanizing machine for first vulcanization treatment, and control the temperature to be 170℃ and the pressure to be 15 MPa, and vulcanize for 30 min under the condition; then transfer the hose blank to the hot air circulating oven, and perform second vulcanization treatment under the condition that the temperature is 180℃, and control the time length to be 120 min. After vulcanization is completed, cool the fuel hose to reduce the temperature to normal temperature, and stabilize the physical properties of the hose. Then, according to the actual use requirement, cut the hose to a fixed length to ensure that the length of the hose meets the standard.

[0067] Example 2

[0068] The difference between the preparation method of the fuel hose described in Example 2 and Example 1 is only that the amount of fluorine rubber and fluororesin used in the preparation process of the fuel hose described in Example 2 is different from that of Example 1.

[0069] The specific operation steps include:

[0070] (1) According to the weight parts, 80 parts of common 26 type fluorine rubber, 20 parts of THV fluororesin, 8 parts of fluorine-based alkyl polyether modified polysiloxane, 6 parts of anti-aging agent RD, 10 parts of white carbon black, 3 parts of triallyl isocyanurate, 2 parts of 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane and 12 parts of stearic acid are weighed.

[0071] (2) Pretreatment of common type 26 fluororubber and THV fluororesin: the common type 26 fluororubber is placed on an open mill for thin pass operation, and the number of thin pass is set to 20 times; the THV fluororesin is placed in an oven at 90℃ for drying for 3h.

[0072] (3) The pretreated common type 26 fluororubber is put into an internal mixer, the temperature of the internal mixer is raised to 50℃, and plastication operation is performed for 10min. Then, the solubilizer, antioxidant RD and stearic acid are sequentially added, and the mixing is continued for 8min to make the additives fully dispersed in the fluororubber. Then, the reinforcing agent white carbon black is added, and the mixing is continued for 10min. Then, the THV fluororesin is added, and the pressure of the internal mixer is controlled to 0.8MPa, and the temperature is raised to 70℃, and the mixing is continued for 15min. Through the high temperature and high pressure environment, the fluororubber and the fluororesin are fully fused to form a uniform fluororubber mixture.

[0073] (4) The fluororubber mixture is transferred from the internal mixer to the open mill, and when the temperature of the fluororubber mixture is reduced to 60℃, the vulcanization accelerator is added, and then the thin pass mixing operation is performed, and the number of thin pass is 20 times, to obtain a fluororubber base material;

[0074] (5) The fluororubber base material is put into an extruder, and is extruded into a fuel hose through a fuel hose die. In the extrusion molding process, the temperature of each section of the extruder is controlled: the temperature of the head is set to 115℃, the temperature of the extrusion section is set to 105℃, the temperature of the plasticizing section is set to 105℃, and the temperature of the screw section is set to 100℃, and at the same time, the extrusion speed is controlled to 10m / min, to obtain a hose blank.

[0075] (6) The hose blank is placed on a flat vulcanizing machine for first vulcanization treatment, and the temperature is controlled to 170℃ and the pressure is controlled to 15MPa, and the vulcanization treatment is performed for 30min under this condition; then the hose blank is transferred to a hot air circulating oven, and the second vulcanization treatment is performed at a temperature of 180℃, and the time is controlled to 120min. After vulcanization is completed, the fuel hose is cooled to reduce the temperature to room temperature, to stabilize the physical properties of the hose. Then, according to the actual use requirement, the hose is cut to a fixed length to ensure that the length of the hose meets the standard.

[0076] Example 3

[0077] The difference between the preparation method of the fuel hose described in Example 3 and Example 1 is only that the amount of fluororubber and fluororesin used in the preparation process of the fuel hose described in Example 3 is different from that of Example 1.

[0078] The specific operation steps include:

[0079] (1) According to the weight parts, 75 parts of ordinary type 26 fluororubber, 25 parts of THV fluororesin, 8 parts of fluorine-based alkyl polyether modified polysiloxane, 6 parts of antioxidant RD, 10 parts of white carbon black, 3 parts of triallyl isocyanurate, 2 parts of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, and 12 parts of stearic acid.

[0080] (2) Pretreatment of ordinary type 26 fluororubber and THV fluororesin: place the ordinary type 26 fluororubber on the open mill for thin pass operation, and set the thin pass number to 20 times; place the THV fluororesin in an oven at 90°C for drying for 3h.

[0081] (3) Put the pretreated ordinary type 26 fluororubber into the internal mixer, and increase the temperature of the internal mixer to 50°C for plasticizing operation, and control the time to 10 min. Then, sequentially add the solubilizer, antioxidant RD and stearic acid in order, and continue to mix for 8 min to make these additives fully dispersed in the fluororubber. Then add the reinforcing agent white carbon black, and mix for another 10 min. Then add the THV fluororesin, and control the pressure of the internal mixer to 0.8 MPa, and increase the temperature to 70°C, and mix for 15 min, so as to promote the fluororubber and the fluororesin to fully fuse through the high temperature and high pressure environment, and form a uniform fluororubber mixture.

[0082] (4) Transfer the fluororubber mixture from the internal mixer to the open mill, and add the vulcanization accelerator when the temperature of the fluororubber mixture decreases to 60°C, and then perform thin pass mixing operation, and the thin pass number is 20 times, to obtain a fluororubber base material;

[0083] (5) Put the fluororubber base material into the extruder, and extrude into a fuel hose through a fuel hose die. In the extrusion molding process, control the temperature of each section of the extruder: the head temperature is set to 115°C, the extrusion section temperature is set to 105°C, the plasticizing section temperature is set to 105°C, and the screw section temperature is set to 100°C, and at the same time, the extrusion speed is controlled to 10 m / min, to obtain a hose blank.

[0084] (6) Place the hose blank on a flat plate vulcanizing machine for first vulcanization treatment, and control the temperature to 170°C and the pressure to 15 MPa, and vulcanize for 30 min under this condition; then transfer the hose blank to a hot air circulating oven, and perform second vulcanization treatment at a temperature of 180°C, and control the time length to 120 min. After vulcanization is completed, cool the fuel hose to reduce its temperature to normal temperature, and stabilize the physical properties of the hose. Then cut the hose to a fixed length according to the actual use requirement, to ensure that the length of the hose meets the standard.

[0085] Example 4

[0086] The difference between the preparation method of the fuel hose of Example 4 and that of Example 1 is only that the amounts of the fluororubber and the fluororesin used in the preparation of the fuel hose of Example 4 are different from those of Example 1.

[0087] The specific operation steps include:

[0088] (1) According to the weight parts, 70 parts of ordinary 26 type fluororubber, 30 parts of THV fluororesin, 8 parts of fluorine-based alkyl polyether modified polysiloxane, 6 parts of antioxidant RD, 10 parts of white carbon black, 3 parts of triallyl isocyanurate, 2 parts of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane and 12 parts of stearic acid are weighed.

[0089] (2) The ordinary 26 type fluororubber and THV fluororesin are pretreated: the ordinary 26 type fluororubber is placed on the open mill for thin pass operation, and the thin pass number is set to 20 times; the THV fluororesin is placed in a 90℃ oven for drying for 3h.

[0090] (3) The pretreated ordinary 26 type fluororubber is put into the internal mixer, the temperature of the internal mixer is raised to 50℃, and plasticating operation is carried out, and the time is controlled to be 10min. Then, the solubilizing agent, the antioxidant RD and the stearic acid are sequentially added, and the mixing is continued for 8min, so that these additives are fully dispersed in the fluororubber. Then the reinforcing agent white carbon black is added, and the mixing is continued for 10min. Then the THV fluororesin is added, and at the same time the pressure of the internal mixer is controlled to be 0.8MPa, and the temperature is raised to 70℃, and the mixing is carried out for 15min, so that the fluororubber and the fluororesin are fully fused through the high temperature and high pressure environment, and a uniform fluororubber mixture is formed.

[0091] (4) The fluororubber mixture is transferred from the internal mixer to the open mill, and when the temperature of the fluororubber mixture is reduced to 60℃, the vulcanization accelerator is added, and then the thin pass mixing operation is carried out, and the thin pass number is 20 times, so that the fluororubber base material is obtained.

[0092] (5) The fluororubber base material is put into the extruder, and is extruded and formed through the fuel hose mold. In the extrusion forming process, the temperatures of each section of the extruder are controlled: the temperature of the head is set to 115℃, the temperature of the extrusion section is set to 105℃, the temperature of the plasticizing section is set to 105℃, and the temperature of the screw section is set to 100℃, and at the same time, the extrusion speed is controlled to be 10m / min, so that the hose blank is obtained.

[0093] (6) The rubber tube blank is placed on a flat vulcanization machine for first vulcanization treatment, with a temperature of 170°C and a pressure of 15 MPa, and vulcanization treatment is performed for 30 min under the above conditions; then the rubber tube blank is transferred to a hot air circulating oven, and second vulcanization treatment is performed at a temperature of 180°C, with a control time of 120 min. After vulcanization is completed, the fuel oil rubber tube is cooled to reduce its temperature to room temperature, and the physical properties of the rubber tube are stabilized. Then, according to actual use requirements, the rubber tube is cut to a fixed length to ensure that the length of the rubber tube meets the standard.

[0094] Example 5

[0095] The difference between the preparation method of the fuel oil rubber tube described in Example 5 and that of Example 1 is that the ETFE resin is used instead of the THV fluororesin in the preparation process of the fuel oil rubber tube described in Example 5.

[0096] Example 6

[0097] The difference between the preparation method of the fuel oil rubber tube described in Example 6 and that of Example 1 is that the PTFE resin is used instead of the THV fluororesin in the preparation process of the fuel oil rubber tube described in Example 6.

[0098] Example 7

[0099] The difference between the preparation method of the fuel oil rubber tube described in Example 7 and that of Example 1 is that the temperature of the second mixing is 60°C in the preparation process of the fuel oil rubber tube described in Example 7.

[0100] The specific operation steps include:

[0101] (1) The ordinary 26 type fluorine rubber 85 parts, THV fluororesin 15 parts, fluorine base alkyl polyether modified polysiloxane 8 parts, antioxidant RD 6 parts, white carbon black 10 parts, triallyl isocyanurate 3 parts, 2, 5-dimethyl-2, 5-bis(tert-butyl peroxy) hexane 2 parts, and stearic acid 12 parts are weighed according to the weight parts.

[0102] (2) The ordinary 26 type fluorine rubber and THV fluororesin are pretreated: the ordinary 26 type fluorine rubber is placed on an open mill for thin pass operation, and the thin pass number is set to 20 times; the THV fluororesin is dried in an oven at 90°C for 3 h.

[0103] (3) Put the pretreated common 26 type fluorine rubber into the internal mixer, and increase the temperature of the internal mixer to 50°C to perform plastication operation, and the time is controlled to be 10 min. Then, sequentially add the solubilizer, anti-aging agent RD and stearic acid in order, and continue to mix for 8 min to make these additives fully dispersed in the fluorine rubber. Then, add the reinforcing agent white carbon black, and mix for 10 min. Then, add the THV fluororesin, and control the pressure of the internal mixer to be 0.8 MPa, and increase the temperature to 60°C, and mix for 15 min, so as to promote the fluorine rubber and the fluororesin to be fully fused through the high temperature and high pressure environment, and form a uniform fluorine rubber mixture.

[0104] (4) Transfer the fluorine rubber mixture from the internal mixer to the open mill, and when the temperature of the fluorine rubber mixture is reduced to 60°C, add the vulcanization accelerator, and then perform thin pass mixing operation, and the thin pass number is 20 times to obtain a fluorine rubber base material.

[0105] (5) Put the fluorine rubber base material into the extruder, and extrude and form through the fuel hose die. In the extrusion forming process, the temperature of each section of the extruder is controlled: the temperature of the head is set to 115°C, the temperature of the extrusion section is set to 105°C, the temperature of the plasticizing section is set to 105°C, and the temperature of the screw section is set to 100°C, and at the same time, the extrusion speed is controlled to be 10 m / min to obtain a hose blank.

[0106] (6) Place the hose blank on the flat vulcanizing machine to perform first vulcanization treatment, and control the temperature to be 170°C and the pressure to be 15 MPa, and vulcanize for 30 min under this condition; then transfer the hose blank to the hot air circulating oven, and perform second vulcanization treatment under the condition that the temperature is 180°C, and control the time length to be 120 min. After vulcanization is completed, cool the fuel hose to reduce the temperature to normal temperature to stabilize the physical properties of the hose. Then, according to the actual use requirement, cut the hose to a fixed length to ensure that the length of the hose meets the standard.

[0107] Example 8

[0108] The difference between the preparation method of the fuel hose in Example 8 and Example 1 is only that the temperature of the second mixing in the preparation process of the fuel hose in Example 8 is 50°C.

[0109] The specific operation steps include:

[0110] (1) According to the weight parts, take 85 parts of common 26 type fluorine rubber, 15 parts of THV fluororesin, 8 parts of fluorine-based alkyl polyether modified polysiloxane, 6 parts of anti-aging agent RD, 10 parts of white carbon black, 3 parts of triallyl isocyanurate, 2 parts of 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane and 12 parts of stearic acid.

[0111] (2) Pretreatment of common type 26 fluororubber and THV fluororesin: the common type 26 fluororubber is placed on an open mill for thin pass operation, and the thin pass number is set to 20 times; the THV fluororesin is placed in an oven at 90℃ for drying for 3h.

[0112] (3) The pretreated common type 26 fluororubber is put into a mixer, the mixer temperature is raised to 50℃, and plasticizing operation is performed for 10min. Then, the solubilizer, antioxidant RD and stearic acid are sequentially added, and mixing is continued for 8min to make the additives fully dispersed in the fluororubber. Then, the reinforcing agent white carbon black is added, and mixing is continued for 10min. Then, the THV fluororesin is added, and the mixer pressure is controlled at 0.8MPa, and the temperature is maintained at 50℃, and mixing is performed for 15min, so as to promote the fluororubber and the fluororesin to fully fuse through the high temperature and high pressure environment, and form a uniform fluororubber mixture.

[0113] (4) The fluororubber mixture is transferred from the mixer to the open mill, and when the temperature of the fluororubber mixture is reduced to 60℃, the vulcanization accelerator is added, and then thin pass mixing operation is performed, and the thin pass number is 20 times, to obtain a fluororubber base material;

[0114] (5) The fluororubber base material is put into an extruder, and extruded into a fuel hose through a fuel hose die. In the extrusion molding process, the temperature of each section of the extruder is controlled: the head temperature is set to 115℃, the extrusion section temperature is set to 105℃, the plasticizing section temperature is set to 105℃, and the screw section temperature is set to 100℃, and at the same time, the extrusion speed is controlled at 10m / min, to obtain a hose blank.

[0115] (6) The hose blank is placed on a flat vulcanizing machine for first vulcanization treatment, and the temperature is controlled at 170℃ and the pressure is controlled at 15MPa, and the vulcanization treatment is performed for 30min under this condition; then the hose blank is transferred to a hot air circulating oven, and the second vulcanization treatment is performed at a temperature of 180℃, and the time is controlled for 120min. After vulcanization is completed, the fuel hose is cooled to reduce the temperature to room temperature, to stabilize the physical properties of the hose. Then, according to the actual use requirement, the hose is cut to a fixed length to ensure that the length of the hose meets the standard.

[0116] Example 9

[0117] The difference between the preparation method of the fuel hose of Example 9 and Example 1 is only that the temperature of the second mixing in the preparation process of the fuel hose of Example 9 is 40℃.

[0118] The specific operation steps include:

[0119] (1) According to the weight parts, 85 parts of ordinary type 26 fluororubber, 15 parts of THV fluororesin, 8 parts of fluorine-based alkyl polyether modified polysiloxane, 6 parts of antioxidant RD, 10 parts of white carbon black, 3 parts of triallyl isocyanurate, 2 parts of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, and 12 parts of stearic acid.

[0120] (2) Pretreatment of ordinary type 26 fluororubber and THV fluororesin: place the ordinary type 26 fluororubber on the open mill for thin pass operation, and set the thin pass number to 20 times; place the THV fluororesin in an oven at 90°C for drying for 3h.

[0121] (3) Put the pretreated ordinary type 26 fluororubber into the internal mixer, and increase the temperature of the internal mixer to 50°C for plasticizing operation, and control the time to 10 min. Then, sequentially add the solubilizer, antioxidant RD and stearic acid in order, and continue to mix for 8 min to make these additives fully dispersed in the fluororubber. Then add the reinforcing agent white carbon black, and mix for another 10 min. Then add the THV fluororesin, and at the same time, control the pressure of the internal mixer to 0.8 MPa, and reduce the temperature to 40°C, and mix for 15 min, so as to promote the fluororubber and the fluororesin to fully fuse through the high temperature and high pressure environment, and form a uniform fluororubber mixture.

[0122] (4) Transfer the fluororubber mixture from the internal mixer to the open mill, and when the temperature of the fluororubber mixture is reduced to 60°C, add the vulcanization accelerator, and then perform thin pass mixing operation, and the thin pass number is 20 times, to obtain a fluororubber base material;

[0123] (5) Put the fluororubber base material into the extruder, and extrude into a fuel hose through a fuel hose die. In the extrusion molding process, control the temperature of each section of the extruder: the head temperature is set to 115°C, the extrusion section temperature is set to 105°C, the plasticizing section temperature is set to 105°C, and the screw section temperature is set to 100°C, and at the same time, the extrusion speed is controlled to 10 m / min, to obtain a hose blank.

[0124] (6) Place the hose blank on a flat vulcanizing machine for first vulcanization treatment, and control the temperature to 170°C and the pressure to 15 MPa, and vulcanize for 30 min under this condition; then transfer the hose blank to a hot air circulating oven, and perform second vulcanization treatment at a temperature of 180°C, and control the time length to 120 min. After vulcanization is completed, cool the fuel hose to reduce its temperature to normal temperature, and stabilize the physical properties of the hose. Then, according to the actual use requirement, cut the hose to a fixed length to ensure that the length of the hose meets the standard.

[0125] Comparative Example 1

[0126] The preparation method of the fuel hose of Comparative Example 1 is different from that of Example 1 only in that the mixing manner of the fluororubber and the fluororesin in the preparation process of the fuel hose of Comparative Example 1 is different.

[0127] The specific operation includes:

[0128] The pretreated fluororubber of Type 26 is put into the internal mixer, the temperature of the internal mixer is increased to 50°C, and plasticating operation is performed for 5 min. Then, the solubilizer, antioxidant RD, stearic acid, reinforcing agent and THV fluororesin are sequentially added, and the temperature is increased to 70°C, and mixing is performed for 33 min; the remaining operations are the same as those of Example 1.

[0129] Comparative Example 2

[0130] The preparation method of the fuel hose of Comparative Example 2 is different from that of Example 1 only in that the fuel hose of Comparative Example 2 does not contain raw material fluororesin in the preparation process.

[0131] Comparative Example 3

[0132] The preparation method of the fuel hose of Comparative Example 3 is different from that of Example 1 only in that the fluororubber base material and the THV fluororesin are separately extruded in the preparation process of the fuel hose of Comparative Example 3.

[0133] The specific operation includes: the fluororubber base material and the THV fluororesin are separately put into the extruder, and are extruded and formed through the fuel hose mold, and then the fluororubber hose is placed in the inner layer, and the fluororesin hose is coated on the outer layer, so as to form a composite hose.

[0134] Performance research of the fuel hoses of Examples 1-9 and Comparative Examples 1-3 of the present application:

[0135] High temperature resistance: after the fuel hoses of Examples 1-9 and Comparative Examples 1-3 of the present application are placed in a hot air environment at 200°C for 70 hours, the appearance of the fuel hoses is observed, and the tensile strength retention rate is tested, and the results are shown in Table 1.

[0136] Fuel oil penetration resistance: the fuel hoses of Examples 1-9 and Comparative Examples 1-3 of the present application are all soaked in No. 97 gasoline, and are placed at a temperature of 60°C for 72 hours, and the fuel oil penetration rate is detected, and the results are shown in Table 1.

[0137] Flexibility: the fuel hoses of Examples 1-9 and Comparative Examples 1-3 of the present application are installed on a flex fatigue testing machine, and are repeatedly bent at a certain frequency, angle and stroke, and the cycle number until cracks appear is recorded, and the results are shown in Table 1.

[0138] Table 1

[0139] compression set / % Fuel permeability / g / (m 2 ·24h) cycle bending times / times example 1 24 1.1 1227 example 2 26 1.3 1213 example 3 26 1.4 1200 example 4 27 1.5 1257 example 5 28 1.2 1003 example 6 27 1.4 997 example 7 25 1.1 1218 example 8 26 1.3 1210 example 9 25 1.4 1204 comparative example 1 27 1.5 1123 comparative example 2 26 1.8 990 comparative example 3 29 2.0 893

[0140] As can be seen from Table 1, the fuel hose described in the application has significant advantages in high temperature resistance, fuel permeation resistance and flexibility, and can meet the strict use requirements of modern high-performance fuel hoses.

[0141] As can be seen from Comparative Examples 1-4, when the weight content ratio of the fluoroelastomer and the THV fluororesin in the fuel hose is 80-85:15-20, the fuel hose prepared has more significant advantages in high temperature resistance, fuel permeation resistance and flexibility.

[0142] As can be seen from Comparative Example 1 and Examples 5-6, the fuel hose prepared by compounding the THV fluororesin and the fluoroelastomer has more significant advantages in high temperature resistance, fuel permeation resistance and flexibility.

[0143] As can be seen from Comparative Example 1 and Examples 7-9, when the temperature of the second mixing in the preparation process of the fuel hose is 60-70℃, the fuel hose prepared has more significant advantages in high temperature resistance, fuel permeation resistance and flexibility.

[0144] Although the above examples have been shown and described, it can be understood that the above examples are exemplary and cannot be understood as limiting the application, and the changes, modifications, replacements and variations of the above examples made by those skilled in the art are within the protection scope of the application.

Claims

1. A fuel hose, characterized by The raw materials include the following weight parts: fluoro rubber 70-90 parts, fluororesin 10-30 parts, solubilizer 6-10 parts, antioxidant 4-8 parts, reinforcing agent 8-12 parts, vulcanization accelerator 2-5 parts and stearic acid 10-14 parts.

2. The fuel hose of claim 1 wherein, The mass ratio of the fluoro rubber and the fluororesin is 80-85:15-20.

3. The fuel hose of claim 1 wherein, The fluoro rubber includes one or more of vinylidene fluoride and hexafluoropropylene copolymer, vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene terpolymer, vinylidene fluoride and chlorotrifluoroethylene copolymer, vinylidene fluoride and perfluoro(alkyl vinyl ether) copolymer, tetrafluoroethylene and perfluoro(alkyl vinyl ether) copolymer; And / or, the fluororesin includes THV fluororesin.

4. The fuel hose of claim 1 wherein, The solubilizer includes fluorine-based alkyl polyether modified polysiloxane; And / or, the antioxidant includes antioxidant RD; And / or, the reinforcing agent includes white carbon black; And / or, the vulcanization accelerator includes 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane and triallyl isocyanurate.

5. The fuel hose of claim 4 wherein, The mass ratio of the 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane and triallyl isocyanurate is (4-8):(6-10).

6. The method of producing the fuel hose according to any one of claims 1 to 5, characterized by, The method includes the following steps: (1) mixing fluoro rubber, solubilizer, antioxidant, reinforcing agent and stearic acid for first mixing to obtain a mixture; (2) mixing the mixture and fluororesin for second mixing to obtain a fluoro rubber mixture; (3) mixing the fluoro rubber mixture and vulcanization accelerator for thin pass mixing to obtain a fluoro rubber base; (4) sequentially performing extrusion molding and vulcanization treatment on the fluoro rubber base to obtain the fuel hose.

7. The method of claim 6, wherein the fuel hose is prepared by the steps of: In step (1), the temperature of the first mixing is 50-70℃, and the time of the first mixing is 15-25min; And / or, in step (2), the temperature of the second mixing is 40-70℃, the pressure of the second mixing is 0.5-0.8MPa, and the time of the second mixing is 15-20min.

8. The method of claim 6, wherein the fuel hose is prepared by the steps of: In step (3), the temperature of the thin pass mixing is 50-70℃, and the time of the thin pass mixing is 10-20min.

9. The method of claim 6, wherein the fuel hose is prepared by the steps of: In step (4), the vulcanization treatment is performed in two stages, including first vulcanization treatment and second vulcanization treatment.

10. The method of claim 9, wherein the fuel hose is prepared by the steps of: The temperature of the first vulcanization treatment is 165-175℃, the pressure of the first vulcanization treatment is 10-15MPa, and the time of the first vulcanization treatment is 27-33min; And / or, the temperature of the second vulcanization treatment is 175-185℃, and the time of the second vulcanization treatment is 120-240min.