CN111748136A - Thermoplastic vulcanized elastomer for wire harness sheath and preparation method thereof - Google Patents

Thermoplastic vulcanized elastomer for wire harness sheath and preparation method thereof Download PDF

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Publication number
CN111748136A
CN111748136A CN202010642104.8A CN202010642104A CN111748136A CN 111748136 A CN111748136 A CN 111748136A CN 202010642104 A CN202010642104 A CN 202010642104A CN 111748136 A CN111748136 A CN 111748136A
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China
Prior art keywords
stirring
rubber
parts
barrel
mixing
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CN202010642104.8A
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Inventor
夏玉洁
曹春林
王江玉
吴章柱
黄慧
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Anhui Zhongding Rubber and Plastic Products Co Ltd
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Anhui Zhongding Rubber and Plastic Products Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers

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Abstract

The invention discloses a thermoplastic vulcanized elastomer for a wire harness sheath and a preparation method thereof, wherein the thermoplastic vulcanized elastomer is prepared from the following raw materials in parts by weight: 60-70 parts of rubber, 20-30 parts of plastic, 10-20 parts of filler, 1-10 parts of softener, 1-10 parts of aging agent, 1-10 parts of processing aid, 1-10 parts of vulcanizing agent and 1-10 parts of accelerator; according to the stirring device, the fourth air cylinder is started, the top cover is covered on the second stirring barrel, then the second air cylinder is started to drive the mounting plate to lift, further drive the stirring claws to lift, then the second motor is started to drive the stirring claws to rotate for stirring and mixing, and meanwhile, the third air cylinder is started to push the stirring claws to open or close; promote the top cap through four cylinders and go up and down, the clearance of being convenient for is opened or tightly closes through promoting the stirring claw simultaneously to the inside stirring structure of convenient to detach, is convenient for adjust the scope of stirring, makes things convenient for operation and use. And improve work efficiency, reduce the labour.

Description

Thermoplastic vulcanized elastomer for wire harness sheath and preparation method thereof
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a thermoplastic vulcanized elastomer for a wire harness sheath and a preparation method thereof.
Background
The wire harness in the automobile works in a high-temperature engine compartment for a long time, the appearance of the wire harness is cracked and falls off, and if an internal cable is exposed, electric leakage can be generated. The wire harness interface can be oxidized and rusted due to the mixing of moisture and impurities in an engine compartment, and can also be loosened due to bumping, so that poor contact is caused, and electric sparks are easily generated. Existing wire harness sheaths are typically thermoplastic vulcanizate elastomers.
The thermoplastic elastomer is also called as thermoplastic rubber, is a high polymer material with the characteristics of rubber and thermoplastic plastics, has high elasticity of rubber at normal temperature, can be processed conveniently like plastic at a melting temperature, can be produced by adopting processing modes such as injection molding, extrusion, blow molding and the like, and can recycle waste products and leftover materials. TPE reduces the preparation process of the traditional rubber, saves energy, improves economic benefit, reduces labor intensity, and especially plays a positive role in environmental protection. It is replacing traditional thermoset vulcanizates in an increasing number of fields.
The elastomer prepared by the prior art has insufficient fluidity, is relatively hard and has poor deformability. And the existing preparation methods are operated manually, so that the efficiency of workpieces is low, the labor intensity is high, the mixing effect is inconvenient to improve, and the stirring structure is cleaned.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a thermoplastic vulcanized elastomer for a wire harness sheath and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the thermoplastic vulcanized elastomer for the wire harness sheath is prepared from the following raw materials in parts by weight: 60-70 parts of rubber, 20-30 parts of plastic, 10-20 parts of filler, 1-10 parts of softener, 1-10 parts of aging agent, 1-10 parts of processing aid, 1-10 parts of vulcanizing agent and 1-10 parts of accelerator;
wherein the thermoplastic vulcanized elastomer is prepared by the following steps:
step one, adding part of rubber, plastic, filler, softener, aging agent and processing aid into a stirring barrel I in a mixer for stirring, and then performing melt blending granulation through a screw extrusion barrel; wherein the rubber accounts for 10-70% of the total weight of the rubber in the prepared thermoplastic elastomer;
step two, adding a vulcanizing agent and part of rubber into another stirring barrel I for stirring, and then performing melt blending granulation through a spiral extrusion barrel, wherein the rubber accounts for 20-60% of the total weight of the rubber in the prepared thermoplastic elastomer;
step three, adding the accelerator and part of the rubber into a stirring barrel II for stirring, then extruding and granulating, and conveying to a vulcanizing tank, wherein the accelerator accounts for 5-30% of the total weight of the rubber in the prepared thermoplastic elastomer;
and step four, conveying the particles obtained in the step one and the step two into a mixing barrel through a feed hopper, then mixing, finally conveying into a vulcanizing tank through a discharge groove, and carrying out dynamic vulcanization treatment on the vulcanizing tank.
As a further scheme of the invention: the rubber comprises: neoprene, natural rubber, trans-isoprene rubber, ethylene propylene diene monomer, butadiene rubber, ethylene-vinyl acetate copolymer, chlorinated polyethylene rubber, acrylate rubber, nitrile rubber, styrene butadiene rubber, or a mixture thereof.
As a further scheme of the invention: the plastic comprises: polyethylene, polystyrene, polyvinyl chloride, polypropylene, polyamide, acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, polycarbonate, polymethyl methacrylate, polybutylene terephthalate, or a mixture thereof.
As a further scheme of the invention: the vulcanizing agent comprises organic peroxide, sulfur, brominated phenolic resin or a mixture thereof.
As a further scheme of the invention: the vulcanizing agent component content percentage in the vulcanizing agent masterbatch is 2-90%.
As a further scheme of the invention: the accelerator comprises dithiocarbamates, xanthates, thiazoles, thioureas, guanidines, sulfenamides, thiurams, aldamines, metal halides, or mixtures thereof.
As a further scheme of the invention: the preparation method of the thermoplastic vulcanized elastomer for the wire harness sheath comprises the following steps:
step one, adding part of rubber, plastic, filler, softener, aging agent and processing aid into a stirring barrel I in a mixer for stirring, and then performing melt blending granulation through a screw extrusion barrel; wherein the rubber accounts for 10-70% of the total weight of the rubber in the prepared thermoplastic elastomer;
step two, adding a vulcanizing agent and part of rubber into another stirring barrel I for stirring, and then performing melt blending granulation through a spiral extrusion barrel, wherein the rubber accounts for 20-60% of the total weight of the rubber in the prepared thermoplastic elastomer;
step three, adding the accelerator and part of the rubber into a stirring barrel II for stirring, then extruding and granulating, and conveying to a vulcanizing tank, wherein the accelerator accounts for 5-30% of the total weight of the rubber in the prepared thermoplastic elastomer;
and step four, conveying the particles obtained in the step one and the step two into a mixing barrel through a feed hopper, then mixing, finally conveying into a vulcanizing tank through a discharge groove, and carrying out dynamic vulcanization treatment on the vulcanizing tank.
As a further scheme of the invention: the working steps of the mixer are as follows:
step one, starting a motor III to drive a stirring rod to rotate for stirring, after stirring is completed, conveying the mixture through a spiral extrusion barrel for extrusion granulation, then entering a mixing barrel through a feed hopper, driving a belt pulley to rotate by the starting motor, driving a threaded sleeve to rotate by the belt pulley, driving a rotary blade to rotate by the threaded sleeve, simultaneously driving a threaded rod to rotate by the threaded sleeve, driving a U-shaped rod II, a rotary blade II and the U-shaped rod I to rotate by the threaded rod, driving a stirring plate and a scraping plate to rotate by the U-shaped rod for stirring and mixing, then driving a plug board to ascend by starting a cylinder I, removing the mixture through a discharge chute, and conveying the mixture to a vulcanizing tank;
step two, starting a cylinder four, covering a top cover on a stirring barrel two, then starting the cylinder two to drive a mounting plate to lift and further drive a stirring claw to lift, then starting a motor two to drive the stirring claw to rotate for stirring and mixing, and simultaneously starting a cylinder three to push the stirring claw to open or close; then extruding and granulating the mixture through a spiral extrusion barrel, and conveying the mixture into a vulcanizing tank; and carrying out dynamic vulcanization treatment on the vulcanization box.
As a further scheme of the invention: the mixing machine comprises a first mixing tank, two first mixing tanks and two second mixing tanks, wherein a third motor is fixedly mounted at the center of the top of the first mixing tank, an output shaft of the third motor is connected with a mixing rod arranged in the first mixing tank, a spiral extrusion tank is fixedly mounted at the bottom of the first mixing tank, the spiral extrusion tank is obliquely arranged, the other end of the spiral extrusion tank is connected with a feed hopper, a first mixing tank is fixedly mounted at the bottom of the feed hopper, a first motor is fixedly mounted at one side of the first mixing tank, the first motor is connected with a belt pulley through a belt, the belt pulley is arranged at the center of the bottom of the mixing tank, a threaded sleeve is fixedly mounted at the top of the belt pulley, the threaded sleeve extends into the mixing tank, a first rotating blade is fixedly mounted at the outer part of the threaded sleeve, a threaded rod is connected with the inner thread of the threaded sleeve, and a second inverted U-shaped rod, a second rotating blade is uniformly arranged above the second U-shaped rod, first U-shaped rods are symmetrically arranged at two ends of the top of the threaded rod, a plurality of stirring plates are arranged on the inner sides of the first U-shaped rods, a plurality of scraping plates are arranged on the outer sides of the first U-shaped rods, and the other ends of the first U-shaped rods are respectively connected with two ends of the second U-shaped rod;
the other side of the mixing barrel is fixedly provided with a first air cylinder, the bottom of a piston rod of the first air cylinder is fixedly provided with an inserting plate, an obliquely arranged discharging groove is fixedly arranged below the first air cylinder, the inserting plate penetrates through the discharging groove, a vulcanizing tank is arranged below the discharging groove, and the vulcanizing tank is fixedly arranged on one side of the bottom end of the second stirring barrel;
the equal vertical cylinder four of installing in both sides of agitator two, insert in the top cap on the piston rod top of cylinder four, the top cap sets up the top at agitator two, the top center department fixed mounting of top cap has cylinder two, the piston rod of cylinder two runs through the top cap and is connected with the mounting panel, two motors two are installed to the symmetry on the mounting panel, the vertical setting of motor two, fixed mounting has cylinder three on the output shaft of motor two, the piston rod bottom fixed mounting of cylinder three has the stirring claw, the spiral extrusion bucket is installed to one side of agitator two, and the spiral extrusion bucket contacts with the vulcanization box.
The invention has the beneficial effects that: the accelerator masterbatch is used, so that the accelerator with small using amount is easier to be uniformly mixed in a system, and on the other hand, the accelerator is free of dust and pollution after being dispersed in the masterbatch, is suitable for automatic weighing operation, and brings convenience for processing of the dynamic vulcanization thermoplastic elastomer;
the double-masterbatch technology is adopted to solve the difficulty that the rubber of the disperse phase needs to be fully vulcanized and has certain fineness, and the prepared dynamic vulcanization thermoplastic elastomer has the advantages of high fluidity, low compression permanent deformation, low hardness and the like, and has more uniform quality. Moreover, the double-master-rubber technology can correlate the shearing speed with the vulcanizing speed, thereby reducing the dependency on equipment and process, and having the advantages of wide equipment application, simple preparation process, wide processing window and the like.
According to the invention, the starting motor drives the belt pulley to rotate, the belt pulley drives the threaded sleeve to rotate, the threaded sleeve drives the rotary blade to rotate, meanwhile, the threaded sleeve also drives the threaded rod to rotate, the threaded rod drives the U-shaped rod II, the rotary blade II and the U-shaped rod I to rotate, and the U-shaped rod drives the stirring plate and the scraper blade to rotate for stirring and mixing, so that the stirring and mixing effects are better and more uniform; the threaded sleeve is in threaded connection with the threaded rod, so that the whole stirring mechanism is convenient to mount and dismount, is convenient to clean and is convenient to use;
according to the stirring device, the fourth air cylinder is started, the top cover is covered on the second stirring barrel, then the second air cylinder is started to drive the mounting plate to lift, further drive the stirring claws to lift, then the second motor is started to drive the stirring claws to rotate for stirring and mixing, and meanwhile, the third air cylinder is started to push the stirring claws to open or close; promote the top cap through four cylinders and go up and down, the clearance of being convenient for is opened or tightly closes through promoting the stirring claw simultaneously to the inside stirring structure of convenient to detach, is convenient for adjust the scope of stirring, makes things convenient for operation and use. And improve work efficiency, reduce the labour.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the mixing machine of the present invention;
FIG. 2 is a schematic view of the internal structure of the mixing tub of the present invention;
FIG. 3 is a schematic view of the internal structure of the second stirring barrel of the present invention.
In the figure: 1. a first stirring barrel; 2. a screw extrusion barrel; 3. a first motor; 4. a mixing barrel; 5. a belt pulley; 6. inserting plates; 7. a discharge chute; 8. a vulcanization box; 9. a second stirring barrel; 10. a first cylinder; 11. a feed hopper; 12. a stirring plate; 13. a first U-shaped rod; 14. a U-shaped rod II; 15. a squeegee; 16. a threaded rod; 17. a second air cylinder; 18. mounting a plate; 19. a second motor; 20. a third air cylinder; 21. a stirring claw; 22. a cylinder IV; 23. a top cover; 24. rotating the first blade; 25. a threaded sleeve; 26. a third motor; 27. and rotating the second leaf.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the wire harness sheath is made of a thermoplastic vulcanizate, which is prepared from the following raw materials in parts by weight: 60-70 parts of rubber, 20-30 parts of plastic, 10-20 parts of filler, 1-10 parts of softener, 1-10 parts of aging agent, 1-10 parts of processing aid, 1-10 parts of vulcanizing agent and 1-10 parts of accelerator;
wherein the thermoplastic vulcanized elastomer is prepared by the following steps:
step one, adding part of rubber, plastic, filler, softener, aging agent and processing aid into a stirring barrel I1 in a mixer for stirring, and then performing melt blending granulation through a spiral extrusion barrel 2; wherein the rubber accounts for 10-70% of the total weight of the rubber in the prepared thermoplastic elastomer;
secondly, adding a vulcanizing agent and part of rubber into another stirring barrel I1 for stirring, and then performing melt blending granulation through a spiral extrusion barrel 2, wherein the rubber accounts for 20-60% of the total weight of the rubber in the prepared thermoplastic elastomer;
step three, adding the accelerator and part of the rubber into a second stirring barrel 9 for stirring, then extruding and granulating, and conveying to a vulcanization box 8, wherein the accelerator accounts for 5-30% of the total weight of the rubber in the prepared thermoplastic elastomer;
and step four, conveying the particles obtained in the step one and the step two into a mixing barrel 4 through a feed hopper 11, then mixing, finally conveying the particles into a vulcanizing tank 8 through a discharge groove 7, and carrying out dynamic vulcanization treatment on the vulcanizing tank 8.
The rubber comprises: neoprene, natural rubber, trans-isoprene rubber, ethylene propylene diene monomer, butadiene rubber, ethylene-vinyl acetate copolymer, chlorinated polyethylene rubber, acrylate rubber, nitrile rubber, styrene butadiene rubber, or a mixture thereof.
The plastic comprises: polyethylene, polystyrene, polyvinyl chloride, polypropylene, polyamide, acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, polycarbonate, polymethyl methacrylate, polybutylene terephthalate, or a mixture thereof.
The vulcanizing agent comprises organic peroxide, sulfur, brominated phenolic resin or a mixture thereof.
The vulcanizing agent component content percentage in the vulcanizing agent masterbatch is 2-90%.
The accelerator comprises dithiocarbamates, xanthates, thiazoles, thioureas, guanidines, sulfenamides, thiurams, aldamines, metal halides, or mixtures thereof.
The preparation method of the thermoplastic vulcanized elastomer for the wire harness sheath comprises the following steps:
step one, adding part of rubber, plastic, filler, softener, aging agent and processing aid into a stirring barrel I1 in a mixer for stirring, and then performing melt blending granulation through a spiral extrusion barrel 2; wherein the rubber accounts for 10-70% of the total weight of the rubber in the prepared thermoplastic elastomer;
secondly, adding a vulcanizing agent and part of rubber into another stirring barrel I1 for stirring, and then performing melt blending granulation through a spiral extrusion barrel 2, wherein the rubber accounts for 20-60% of the total weight of the rubber in the prepared thermoplastic elastomer;
step three, adding the accelerator and part of the rubber into a second stirring barrel 9 for stirring, then extruding and granulating, and conveying to a vulcanization box 8, wherein the accelerator accounts for 5-30% of the total weight of the rubber in the prepared thermoplastic elastomer;
and step four, conveying the particles obtained in the step one and the step two into a mixing barrel 4 through a feed hopper 11, then mixing, finally conveying the particles into a vulcanizing tank 8 through a discharge groove 7, and carrying out dynamic vulcanization treatment on the vulcanizing tank 8.
The working steps of the mixer are as follows:
step one, starting a third motor 26 to drive a stirring rod to rotate for stirring, after stirring is completed, conveying, extruding and granulating through a spiral extruding barrel 2, then entering a mixing barrel 4 through a feed hopper 11, starting a first motor 3 to drive a belt pulley 5 to rotate, driving a threaded sleeve 25 to rotate by the belt pulley 5, driving a first rotating blade 24 to rotate by the threaded sleeve 25, simultaneously driving a threaded rod 16 to rotate by the threaded sleeve 25, driving a second U-shaped rod 14, a second rotating blade 27 and a first U-shaped rod 13 to rotate by the threaded rod 16, driving a stirring plate 12 and a scraping plate 15 to rotate by the first U-shaped rod 13 for stirring and mixing, then starting a first air cylinder 10 to drive a plug plate 6 to ascend, discharging a mixed material through a discharge groove 7, and conveying the mixed material to a vulcanizing tank 8;
step two, starting a fourth air cylinder 22, covering a top cover 23 on a second stirring barrel 9, then starting a second air cylinder 17, driving a mounting plate 18 to lift, further driving a stirring claw 21 to lift, then starting a second motor 19, driving the stirring claw 21 to rotate for stirring and mixing, and simultaneously starting a third air cylinder 20, and pushing the stirring claw 21 to open or close; then the mixture is extruded and granulated through a spiral extrusion barrel 2 and is conveyed into a vulcanizing tank 8; the vulcanizing tank 8 is subjected to dynamic vulcanization treatment.
The mixing machine comprises a first mixing tank 1, wherein the first mixing tank 1 comprises two mixing tanks 1, the top center of the first mixing tank 1 is fixedly provided with a third motor 26, output shafts of the three motors 26 are connected with a mixing rod arranged in the first mixing tank 1, the bottom of the first mixing tank 1 is fixedly provided with a spiral extrusion tank 2, the spiral extrusion tank 2 is obliquely arranged, the other end of the spiral extrusion tank 2 is connected with a feed hopper 11, the bottom of the feed hopper 11 is fixedly provided with a mixing tank 4, one side of the mixing tank 4 is fixedly provided with a first motor 3, the first motor 3 is connected with a belt pulley 5 through a belt, the belt pulley 5 is arranged at the bottom center of the mixing tank 4, the top of the belt pulley 5 is fixedly provided with a threaded sleeve 25, the threaded sleeve 25 extends into the mixing tank 4, and the outer part of the threaded sleeve 25 is fixedly provided with a first rotating blade 24, a threaded rod 16 is connected to the inner threads of the threaded sleeve 25, an inverted U-shaped rod II 14 is fixedly mounted on the outer portion of the lower end of the threaded rod 16, a rotating blade II 27 is uniformly mounted above the U-shaped rod II 14, U-shaped rods 13 are symmetrically mounted at two ends of the top of the threaded rod 16, a plurality of stirring plates 12 are mounted on the inner sides of the two U-shaped rods I13, a plurality of scraping plates 15 are mounted on the outer sides of the two U-shaped rods I13, and the other ends of the two U-shaped rods I13 are respectively connected with two ends of the U-shaped rod II 14;
the other side of the mixing barrel 4 is fixedly provided with a first air cylinder 10, the bottom of a piston rod of the first air cylinder 10 is fixedly provided with an inserting plate 6, an obliquely arranged discharge groove 7 is fixedly arranged below the first air cylinder 10, the inserting plate 6 penetrates through the discharge groove 7, a vulcanizing tank 8 is arranged below the discharge groove 7, and the vulcanizing tank 8 is fixedly arranged on one side of the bottom end of a second stirring barrel 9;
the equal vertical cylinder four 22 of installing in both sides of agitator two 9, the piston rod top of cylinder four 22 inserts in top cap 23, top cap 23 sets up the top at agitator two 9, the top center department fixed mounting of top cap 23 has cylinder two 17, the piston rod of cylinder two 17 runs through top cap 23 and is connected with mounting panel 18, two motors two 19 are installed to the symmetry on mounting panel 18, two 19 vertical settings of motor, fixed mounting has cylinder three 20 on the output shaft of motor two 19, the piston rod bottom fixed mounting of cylinder three 20 has stirring claw 21, spiral extrusion bucket 2 is installed to one side of agitator two 9, and spiral extrusion bucket 2 contacts with vulcanization case 8.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (8)

1. The thermoplastic vulcanized elastomer for the wire harness sheath is characterized by being prepared from the following raw materials in parts by weight: 60-70 parts of rubber, 20-30 parts of plastic, 10-20 parts of filler, 1-10 parts of softener, 1-10 parts of aging agent, 1-10 parts of processing aid, 1-10 parts of vulcanizing agent and 1-10 parts of accelerator;
wherein the thermoplastic vulcanized elastomer is prepared by the following steps:
step one, adding part of rubber, plastic, filler, softener, aging agent and processing aid into a stirring barrel I in a mixer for stirring, and then performing melt blending granulation through a screw extrusion barrel; wherein the rubber accounts for 10-70% of the total weight of the rubber in the prepared thermoplastic elastomer;
step two, adding a vulcanizing agent and part of rubber into another stirring barrel I for stirring, and then performing melt blending granulation through a spiral extrusion barrel, wherein the rubber accounts for 20-60% of the total weight of the rubber in the prepared thermoplastic elastomer;
step three, adding the accelerator and part of the rubber into a stirring barrel II for stirring, then extruding and granulating, and conveying to a vulcanizing tank, wherein the accelerator accounts for 5-30% of the total weight of the rubber in the prepared thermoplastic elastomer;
and step four, conveying the particles obtained in the step one and the step two into a mixing barrel through a feed hopper, then mixing, finally conveying into a vulcanizing tank through a discharge groove, and carrying out dynamic vulcanization treatment on the vulcanizing tank.
2. The thermoplastic vulcanizate for wire harness sheath according to claim 1, wherein the rubber comprises: neoprene, natural rubber, trans-isoprene rubber, ethylene propylene diene monomer, butadiene rubber, ethylene-vinyl acetate copolymer, chlorinated polyethylene rubber, acrylate rubber, nitrile rubber, styrene butadiene rubber, or a mixture thereof.
3. The thermoplastic vulcanizate for wire harness sheath of claim 1, wherein the plastic comprises: polyethylene, polystyrene, polyvinyl chloride, polypropylene, polyamide, acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, polycarbonate, polymethyl methacrylate, polybutylene terephthalate, or a mixture thereof.
4. The thermoplastic vulcanizate for wire harness sheaths according to claim 1, wherein the vulcanizing agent comprises an organic peroxide, sulfur, a brominated phenolic resin, or a mixture thereof.
5. The thermoplastic vulcanizate for wire harness sheath according to claim 1, wherein the vulcanizing agent component content percentage in the vulcanizing agent masterbatch is 2 to 90%.
6. The thermoplastic vulcanizate for wire harness sheaths according to claim 1, wherein the accelerator comprises dithiocarbamates, xanthates, thiazoles, thioureas, guanidines, sulfenamides thiurams, aldamines, metal halides or mixtures thereof.
7. The preparation method of the thermoplastic vulcanized elastomer for the wire harness sheath is characterized by comprising the following steps of:
step one, adding part of rubber, plastic, filler, softener, aging agent and processing aid into a stirring barrel I in a mixer for stirring, and then performing melt blending granulation through a screw extrusion barrel; wherein the rubber accounts for 10-70% of the total weight of the rubber in the prepared thermoplastic elastomer;
step two, adding a vulcanizing agent and part of rubber into another stirring barrel I for stirring, and then performing melt blending granulation through a spiral extrusion barrel, wherein the rubber accounts for 20-60% of the total weight of the rubber in the prepared thermoplastic elastomer;
step three, adding the accelerator and part of the rubber into a stirring barrel II for stirring, then extruding and granulating, and conveying to a vulcanizing tank, wherein the accelerator accounts for 5-30% of the total weight of the rubber in the prepared thermoplastic elastomer;
and step four, conveying the particles obtained in the step one and the step two into a mixing barrel through a feed hopper, then mixing, finally conveying into a vulcanizing tank through a discharge groove, and carrying out dynamic vulcanization treatment on the vulcanizing tank.
8. The method for producing a thermoplastic vulcanizate for wire harness sheath according to claim 7, wherein the mixer comprises the steps of:
step one, starting a motor III to drive a stirring rod to rotate for stirring, after stirring is completed, conveying the mixture through a spiral extrusion barrel for extrusion granulation, then entering a mixing barrel through a feed hopper, driving a belt pulley to rotate by the starting motor, driving a threaded sleeve to rotate by the belt pulley, driving a rotary blade to rotate by the threaded sleeve, simultaneously driving a threaded rod to rotate by the threaded sleeve, driving a U-shaped rod II, a rotary blade II and the U-shaped rod I to rotate by the threaded rod, driving a stirring plate and a scraping plate to rotate by the U-shaped rod for stirring and mixing, then driving a plug board to ascend by starting a cylinder I, removing the mixture through a discharge chute, and conveying the mixture to a vulcanizing tank;
step two, starting a cylinder four, covering a top cover on a stirring barrel two, then starting the cylinder two to drive a mounting plate to lift and further drive a stirring claw to lift, then starting a motor two to drive the stirring claw to rotate for stirring and mixing, and simultaneously starting a cylinder three to push the stirring claw to open or close; then extruding and granulating the mixture through a spiral extrusion barrel, and conveying the mixture into a vulcanizing tank; and carrying out dynamic vulcanization treatment on the vulcanization box.
CN202010642104.8A 2020-07-06 2020-07-06 Thermoplastic vulcanized elastomer for wire harness sheath and preparation method thereof Pending CN111748136A (en)

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