CN116640435A - Thermoplastic polyurethane inner tube of bicycle and preparation method thereof - Google Patents
Thermoplastic polyurethane inner tube of bicycle and preparation method thereof Download PDFInfo
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- CN116640435A CN116640435A CN202310367021.6A CN202310367021A CN116640435A CN 116640435 A CN116640435 A CN 116640435A CN 202310367021 A CN202310367021 A CN 202310367021A CN 116640435 A CN116640435 A CN 116640435A
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- 239000004433 Thermoplastic polyurethane Substances 0.000 title claims abstract description 109
- 229920002803 thermoplastic polyurethane Polymers 0.000 title claims abstract description 109
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 22
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 21
- 238000004080 punching Methods 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 12
- 239000004593 Epoxy Substances 0.000 claims abstract description 10
- 239000004595 color masterbatch Substances 0.000 claims abstract description 10
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims description 26
- 230000008018 melting Effects 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 24
- 239000000155 melt Substances 0.000 claims description 20
- 229920002635 polyurethane Polymers 0.000 claims description 18
- 239000004814 polyurethane Substances 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- -1 dodecyl trimethyl ammonium bromide modified montmorillonite Chemical class 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 12
- 238000007873 sieving Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 9
- 238000004023 plastic welding Methods 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 8
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 claims description 7
- XJWSAJYUBXQQDR-UHFFFAOYSA-M dodecyltrimethylammonium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)C XJWSAJYUBXQQDR-UHFFFAOYSA-M 0.000 claims description 7
- KEQFTVQCIQJIQW-UHFFFAOYSA-N N-Phenyl-2-naphthylamine Chemical compound C=1C=C2C=CC=CC2=CC=1NC1=CC=CC=C1 KEQFTVQCIQJIQW-UHFFFAOYSA-N 0.000 claims description 6
- 239000006084 composite stabilizer Substances 0.000 claims description 6
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 6
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 235000010215 titanium dioxide Nutrition 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000005469 granulation Methods 0.000 claims 1
- 230000003179 granulation Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000032683 aging Effects 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 description 19
- 229920005549 butyl rubber Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229920002521 macromolecule Polymers 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002135 nanosheet Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 150000003335 secondary amines Chemical group 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/14—Gas barrier composition
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a thermoplastic polyurethane inner tube of a bicycle and a preparation method thereof, belonging to the technical field of preparation of inner tubes of bicycles. The thermoplastic polyurethane inner tube is prepared by firstly carrying out melt blending on epoxy montmorillonite, polyvinyl alcohol, thermoplastic polyurethane, an anti-aging agent and a color masterbatch by a double-screw extruder, extruding and granulating to obtain a special material for the thermoplastic polyurethane inner tube, then carrying out melt extrusion molding on the special material by a single-screw extruder to obtain a thermoplastic polyurethane hose, cutting off the thermoplastic polyurethane hose, punching, bonding an air tap and welding into a ring. The thermoplastic polyurethane bicycle inner tube prepared by the invention has the advantages of light weight, low raw material cost, excellent air tightness, excellent thermo-oxidative aging resistance, recycling property and the like, and has remarkable economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of preparation of bicycle inner tubes, and particularly relates to a thermoplastic polyurethane bicycle inner tube and a preparation method thereof.
Background
The bicycle is an important environment-friendly transportation tool, bicycle riding becomes a main travel mode of people, and meanwhile, more and more people use the bicycle as body-building equipment for riding and exercising. At present, the inner tube of a bicycle is mainly made of butyl rubber. Because the butyl rubber has more side methyl groups and a small number of double bonds on the molecular main chain, the butyl rubber has the characteristics of good air tightness, low air permeability, good heat resistance, ageing resistance, acid and alkali resistance and the like. However, the butyl rubber inner tube needs to be vulcanized and crosslinked during molding, the production environment is bad, and meanwhile, the butyl rubber inner tube cannot be molded by secondary processing after being abandoned and can be only treated in a burning or burying mode, so that serious environmental pollution and precious petroleum resource waste are caused. The thermoplastic polyurethane inner tube has the advantages of injection molding, clean production environment, simple production process, excellent wear resistance, good puncture resistance, recycling and the like, and is a preferred choice for replacing the butyl rubber inner tube as the bicycle inner tube. However, the thermoplastic polyurethane inner tube has the problem of poor air tightness, and limits the application of the thermoplastic polyurethane inner tube.
Disclosure of Invention
The invention provides a thermoplastic polyurethane inner tube of a bicycle and a preparation method thereof, aiming at the problem that the prior thermoplastic polyurethane inner tube has poor air tightness when being applied to the inner tube of the bicycle. The thermoplastic polyurethane bicycle inner tube prepared by the invention has the advantages of light weight, low raw material cost, excellent air tightness, excellent thermo-oxidative aging resistance, recycling property and the like, and has remarkable economic and social benefits. In order to achieve the above purpose, the invention adopts the following technical scheme:
the thermoplastic polyurethane inner tube is prepared by firstly carrying out melt blending on epoxy montmorillonite, polyvinyl alcohol, thermoplastic polyurethane, an anti-aging agent and a color masterbatch by a double-screw extruder, extruding and granulating to obtain a special material for the thermoplastic polyurethane inner tube, carrying out melt extrusion on the special material by a single-screw extruder to form a thermoplastic polyurethane hose, cutting off the thermoplastic polyurethane hose, punching, bonding an air tap and welding into a ring; the preparation method comprises the following steps:
(1) Adding 200-300 g of montmorillonite into 5-10L of deionized water, mechanically stirring for 1-2 hours at room temperature, adding 80-200 g of dodecyl trimethyl ammonium bromide, continuously mechanically stirring for 4-8 hours at 60-80 ℃, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain dodecyl trimethyl ammonium bromide modified montmorillonite;
(2) Adding 100-200 g of dodecyl trimethyl ammonium bromide modified montmorillonite into 4-6L of deionized water, mechanically stirring for 1-2 h at room temperature, adding 100-300 mL of gamma- (2, 3-glycidoxy) propyl trimethoxy silane solution, continuously mechanically stirring for 6-10 h at 50-70 ℃, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain epoxidized montmorillonite;
(3) Mixing 60-80 g of epoxy montmorillonite, 200-300 g of polyvinyl alcohol, 500-1000 g of thermoplastic polyurethane, 10-40 g of an anti-aging agent and 10-20 g of a color master batch for 5-10 min at room temperature by a high-speed mixer, carrying out melt blending on the primary mixing material by a double-screw extruder, extruding and granulating the melt blending material at the melting temperature of 180-220 ℃ and the screw rotating speed of 30-60 rpm to obtain a thermoplastic polyurethane bicycle inner tube special material;
(4) Melting the special material for the thermoplastic polyurethane bicycle inner tube by a single screw extruder, wherein the melting temperature is 170-210 ℃, the screw rotating speed is 10-20 rpm, extruding the melt by a die, the die temperature is 180-220 ℃, the traction speed is 5-10 m/min, and shaping and cooling the extrudate to obtain the thermoplastic polyurethane hose;
(5) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
The solvent of the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane solution is a mixed solution of absolute ethyl alcohol and deionized water with the volume ratio of 1:1, and the concentration of the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane is 100 g/L.
The anti-aging agent is any one of N-phenyl-2-naphthylamine, N-phenyl-N ʹ -cyclohexyl p-phenylenediamine and a calcium-zinc compound stabilizer.
The color master batch is any one of macromolecular yellow master batch, sun-proof scarlet master batch and titanium white powder color master batch.
The invention has the remarkable advantages that:
(1) Polyvinyl alcohol is a polymer material having excellent gas barrier properties. Although the melt blending of polyvinyl alcohol and thermoplastic polyurethane can improve the compatibility of polyvinyl alcohol and thermoplastic polyurethane and the air tightness of the thermoplastic polyurethane inner tube through the intermolecular hydrogen bonding action of the polyvinyl alcohol and the thermoplastic polyurethane, the hydrogen bonding action is only one physical action among molecules, the effect of improving the compatibility of the polyvinyl alcohol and the thermoplastic polyurethane is limited, and the air tightness of the polyvinyl alcohol modified thermoplastic polyurethane inner tube is gradually deteriorated with the time. According to the invention, montmorillonite is taken as a modifier, firstly, the montmorillonite is peeled into a nano sheet structure under the action of dodecyl trimethyl ammonium bromide, then epoxy groups are grafted on the surface of the montmorillonite through chemical reaction with gamma- (2, 3-glycidoxy) propyl trimethoxy silane, and finally, the epoxy groups of the montmorillonite are respectively subjected to ring opening reaction with hydroxyl groups of polyvinyl alcohol and secondary amine groups of thermoplastic polyurethane, so that the polyvinyl alcohol and the thermoplastic polyurethane are chemically connected by the montmorillonite, on one hand, the chemical connection effect is stronger than the hydrogen bonding effect of the polyvinyl alcohol and the thermoplastic polyurethane, and the stable air tightness of the thermoplastic polyurethane inner tube is endowed, and on the other hand, the uniformly dispersed nano sheet montmorillonite can further improve the air tightness of the thermoplastic polyurethane inner tube.
(2) The polyvinyl alcohol can endow the thermoplastic polyurethane inner tube with excellent air tightness, the montmorillonite can endow the thermoplastic polyurethane inner tube with excellent air tightness and air tightness stability, the anti-aging agent can endow the thermoplastic polyurethane inner tube with excellent heat-resistant and oxygen aging performance, meanwhile, compared with the thermoplastic polyurethane, the polyvinyl alcohol, the montmorillonite and the like have lower raw material cost, and all raw materials of the thermoplastic polyurethane inner tube are thermoplastic plastics, small molecular organic compounds and inorganic clay, so that the thermoplastic polyurethane bicycle inner tube prepared by the invention has the advantages of light weight, low raw material cost, excellent air tightness and heat-resistant and oxygen aging performance, recycling and the like, the weight of the inner tube is 41.9-42.. g, the initial tire pressure is 7.0 bar, and when the inner tube is placed in a room temperature environment, the tire pressures are 7.0 bar, 6.8-6.9 bar, 6.6.8 bar, 6.8 bar, 6.7 bar and 6.4-6.7 bar, and the tire pressures are respectively, and when the inner tube is placed in a hot air aging tester, the inner tube has the weight of 41.9-42, 6. g, the initial tire pressure is 7.0 bar, and the social value is 5.6.6.6-6.6 bar, and the social value is 3-6.6.6.6.6 bar, and 3-6.6.6.6 bar, and the social value is 3-6.6.6.6.6.6.6 bar, respectively.
Description of the embodiments
The advantages and effects of the thermoplastic polyurethane bicycle inner tube and the preparation method thereof according to the present embodiment are further described below by way of three examples and four comparative examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples
(1) Adding 250 g montmorillonite into 7.5L deionized water, mechanically stirring at room temperature for 1.5 h, adding 140 g dodecyl trimethyl ammonium bromide, mechanically stirring at 70deg.C for 6 h, filtering, washing, drying, pulverizing, and sieving with 200 mesh sieve to obtain dodecyl trimethyl ammonium bromide modified montmorillonite;
(2) Adding 150 g dodecyl trimethyl ammonium bromide modified montmorillonite into 5L deionized water, mechanically stirring at room temperature for 1.5 h, adding 200 mL gamma- (2, 3-glycidoxy) propyl trimethoxy silane solution, continuously mechanically stirring at 60 ℃ for 8 h, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain epoxidized montmorillonite;
(3) Mixing 70 g epoxy montmorillonite, 250 g polyvinyl alcohol, 750 g thermoplastic polyurethane, 25 g calcium zinc composite stabilizer and 15 g macromolecule yellow master batch for 7.5 min at room temperature by a high-speed mixer, carrying out melt blending on the primary mixture by a double-screw extruder, wherein the melt temperature is 200 ℃, the screw rotating speed is 45 rpm, extruding and granulating the melt blend to obtain the thermoplastic polyurethane inner tube special material of the bicycle;
(4) Melting the special material for the thermoplastic polyurethane bicycle inner tube by a single screw extruder, wherein the melting temperature is 190 ℃, the screw rotating speed is 15 rpm, extruding the melt by a die, the die temperature is 200 ℃, the traction speed is 7.5 m/min, and shaping and cooling the extrudate to obtain the thermoplastic polyurethane hose;
(5) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
Examples
(1) Adding 200 g montmorillonite into 5L deionized water, mechanically stirring at room temperature for 1 h, adding 80 g dodecyl trimethyl ammonium bromide, mechanically stirring at 60deg.C for 8 h, filtering, washing, drying, pulverizing, and sieving with 200 mesh sieve to obtain dodecyl trimethyl ammonium bromide modified montmorillonite;
(2) Adding 100 g dodecyl trimethyl ammonium bromide modified montmorillonite into 4L deionized water, mechanically stirring at room temperature for 1 h, adding 100 mL gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane solution, continuously mechanically stirring at 50 ℃ for 10 h, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain epoxidized montmorillonite;
(3) Mixing 60 g epoxy montmorillonite, 200 g polyvinyl alcohol, 500 g thermoplastic polyurethane, 10 g N-phenyl-N ʹ -cyclohexyl p-phenylenediamine and 10 g sun-proof scarlet master batch for 5 min at room temperature by a high-speed mixer, carrying out melt blending on the primary mixture by a double-screw extruder, wherein the melting temperature is 180 ℃, the screw rotating speed is 30 rpm, extruding and granulating the melt blend to obtain the thermoplastic polyurethane bicycle inner tube special material;
(4) Melting the special material for the thermoplastic polyurethane bicycle inner tube by a single screw extruder, wherein the melting temperature is 170 ℃, the screw rotating speed is 10 rpm, extruding the melt by a die, the die temperature is 180 ℃, the traction speed is 5 m/min, and shaping and cooling the extrudate to obtain the thermoplastic polyurethane hose;
(5) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
Examples
(1) Adding 300 g montmorillonite into 10L deionized water, mechanically stirring at room temperature for 2 h, adding 200 g dodecyl trimethyl ammonium bromide, mechanically stirring at 80deg.C for 4 h, filtering, washing, drying, pulverizing, and sieving with 200 mesh sieve to obtain dodecyl trimethyl ammonium bromide modified montmorillonite;
(2) Adding 200 g dodecyl trimethyl ammonium bromide modified montmorillonite into 6L deionized water, mechanically stirring at room temperature for 2 h, adding 300 mL gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane solution, continuously mechanically stirring at 70 ℃ for 6 h, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain epoxidized montmorillonite;
(3) Mixing 80 g epoxy montmorillonite, 300 g polyvinyl alcohol, 1000 g thermoplastic polyurethane, 40 g N-phenyl-2-naphthylamine and 20 g titanium white powder color master batch for 10 min at room temperature by a high-speed mixer, carrying out melt blending on the primary mixing material by a double-screw extruder, wherein the melting temperature is 220 ℃, the screw rotating speed is 60 rpm, extruding and granulating the melt blending material to obtain the thermoplastic polyurethane bicycle inner tube special material;
(4) Melting the special material for the thermoplastic polyurethane bicycle inner tube by a single screw extruder, wherein the melting temperature is 210 ℃, the screw rotating speed is 20 rpm, extruding the melt by a die, the die temperature is 220 ℃, the traction speed is 10 m/min, and shaping and cooling the extrudate to obtain the thermoplastic polyurethane hose;
(5) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
(1) Mixing 750 g thermoplastic polyurethane, 25 g calcium zinc composite stabilizer and 15 g macromolecular yellow master batch for 7.5 min at room temperature by a high-speed mixer, carrying out melt blending on the primary mixture by a double-screw extruder, extruding and granulating the melt blend at the melting temperature of 200 ℃ and the screw rotating speed of 45 rpm to obtain thermoplastic polyurethane blending materials;
(2) Melting the thermoplastic polyurethane mixture by a single screw extruder, wherein the melting temperature is 190 ℃, the screw rotating speed is 15 rpm, extruding the melt by a die, the die temperature is 200 ℃, the traction speed is 7.5 m/min, and shaping and cooling the extrudate to obtain a thermoplastic polyurethane hose;
(3) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
(1) Mixing 250 g polyvinyl alcohol, 750 g thermoplastic polyurethane, 25 g calcium zinc composite stabilizer and 15 g macromolecule yellow master batch for 7.5 min at room temperature by using a high-speed mixer, carrying out melt blending on the primary mixture by using a double-screw extruder, extruding and granulating the melt blend at the melting temperature of 200 ℃ and the screw rotating speed of 45 rpm to obtain a thermoplastic polyurethane mixture;
(2) Melting the thermoplastic polyurethane mixture by a single screw extruder, wherein the melting temperature is 190 ℃, the screw rotating speed is 15 rpm, extruding the melt by a die, the die temperature is 200 ℃, the traction speed is 7.5 m/min, and shaping and cooling the extrudate to obtain a thermoplastic polyurethane hose;
(3) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
(1) Mixing 70 g montmorillonite, 250 g polyvinyl alcohol, 750 g thermoplastic polyurethane, 25 g calcium zinc composite stabilizer and 15 g macromolecule yellow master batch for 7.5 min at room temperature by using a high-speed mixer, carrying out melt blending on the primary mixture by using a double-screw extruder, extruding and granulating the melt blend at the melting temperature of 200 ℃ and the screw rotating speed of 45 rpm to obtain a thermoplastic polyurethane mixture;
(2) Melting the thermoplastic polyurethane mixture by a single screw extruder, wherein the melting temperature is 190 ℃, the screw rotating speed is 15 rpm, extruding the melt by a die, the die temperature is 200 ℃, the traction speed is 7.5 m/min, and shaping and cooling the extrudate to obtain a thermoplastic polyurethane hose;
(3) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
(1) Adding 250 g montmorillonite into 7.5L deionized water, mechanically stirring at room temperature for 1.5 h, adding 140 g dodecyl trimethyl ammonium bromide, mechanically stirring at 70deg.C for 6 h, filtering, washing, drying, pulverizing, and sieving with 200 mesh sieve to obtain dodecyl trimethyl ammonium bromide modified montmorillonite;
(2) Adding 150 g dodecyl trimethyl ammonium bromide modified montmorillonite into 5L deionized water, mechanically stirring at room temperature for 1.5 h, adding 200 mL gamma- (2, 3-glycidoxy) propyl trimethoxy silane solution, continuously mechanically stirring at 60 ℃ for 8 h, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain epoxidized montmorillonite;
(3) Mixing 70 g epoxy montmorillonite, 750 g thermoplastic polyurethane, 25 g calcium zinc composite stabilizer and 15 g macromolecule yellow master batch for 7.5 min at room temperature by a high-speed mixer, carrying out melt blending on the primary mixture by a double-screw extruder, extruding and granulating the melt blend at the melting temperature of 200 ℃ and the screw rotating speed of 45 rpm to obtain a thermoplastic polyurethane mixture;
(4) Melting the thermoplastic polyurethane mixture by a single screw extruder, wherein the melting temperature is 190 ℃, the screw rotating speed is 15 rpm, extruding the melt by a die, the die temperature is 200 ℃, the traction speed is 7.5 m/min, and shaping and cooling the extrudate to obtain a thermoplastic polyurethane hose;
(5) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
The thermoplastic polyurethane bicycle inner tubes prepared in three examples and four comparative examples were pressurized to a pressure of 7.0 bar, and tire pressure values of the inner tubes were measured in a room temperature environment and when 1 d, 3 d, 5 d, 7 d and 9 d were set in a hot air aging tester, the temperature of which was set to 60 ℃, and the measurement results are shown in the following table.
As can be seen from the test results of the three groups of examples and the four groups of comparative examples, under the same test conditions, the tire pressures of the thermoplastic polyurethane inner tubes prepared by the three groups of examples are larger than those of the thermoplastic polyurethane inner tubes prepared by the four groups of comparative examples, which means that the special material for the thermoplastic polyurethane inner tube is prepared by firstly carrying out melt blending on epoxy montmorillonite, polyvinyl alcohol, thermoplastic polyurethane, an anti-aging agent and color master batch by using a double-screw extruder, extruding and granulating, then carrying out melt extrusion molding on the special material by using a single-screw extruder to form a thermoplastic polyurethane hose, cutting off the thermoplastic polyurethane hose, punching, bonding an air tap and welding into a ring, and thus the thermoplastic polyurethane inner tube with the advantages of light weight, low raw material cost, excellent air tightness, excellent thermo-oxidative aging resistance, recycling property and the like can be prepared.
While the foregoing description illustrates and describes the preferred embodiments of the present invention, as noted above, it is to be understood that the invention is not limited to the forms disclosed herein but is not to be construed as excluding other embodiments, and that various other combinations, modifications and environments are possible and may be made within the scope of the inventive concepts described herein, either by way of the foregoing teachings or by those of skill or knowledge of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (4)
1. A thermoplastic polyurethane inner tube of a bicycle and a preparation method thereof are characterized in that firstly, a double-screw extruder is used for carrying out melt blending on epoxy montmorillonite, polyvinyl alcohol, thermoplastic polyurethane, an anti-aging agent and color master batch, extrusion and granulation are carried out to prepare a special material for the thermoplastic polyurethane inner tube of the bicycle, then a single-screw extruder is used for carrying out melt extrusion molding on the special material to obtain a thermoplastic polyurethane hose, and then the thermoplastic polyurethane hose is cut off, punched, bonded with an air tap and welded into a ring; the preparation method comprises the following steps:
(1) Adding 200-300 g of montmorillonite into 5-10L of deionized water, mechanically stirring for 1-2 hours at room temperature, adding 80-200 g of dodecyl trimethyl ammonium bromide, continuously mechanically stirring for 4-8 hours at 60-80 ℃, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain dodecyl trimethyl ammonium bromide modified montmorillonite;
(2) Adding 100-200 g of dodecyl trimethyl ammonium bromide modified montmorillonite into 4-6L of deionized water, mechanically stirring for 1-2 h at room temperature, adding 100-300 mL of gamma- (2, 3-glycidoxy) propyl trimethoxy silane solution, continuously mechanically stirring for 6-10 h at 50-70 ℃, filtering, washing, drying, crushing and sieving with a 200-mesh sieve to obtain epoxidized montmorillonite;
(3) Mixing 60-80 g of epoxy montmorillonite, 200-300 g of polyvinyl alcohol, 500-1000 g of thermoplastic polyurethane, 10-40 g of an anti-aging agent and 10-20 g of a color master batch for 5-10 min at room temperature by a high-speed mixer, carrying out melt blending on the primary mixing material by a double-screw extruder, extruding and granulating the melt blending material at the melting temperature of 180-220 ℃ and the screw rotating speed of 30-60 rpm to obtain a thermoplastic polyurethane bicycle inner tube special material;
(4) Melting the special material for the thermoplastic polyurethane bicycle inner tube by a single screw extruder, wherein the melting temperature is 170-210 ℃, the screw rotating speed is 10-20 rpm, extruding the melt by a die, the die temperature is 180-220 ℃, the traction speed is 5-10 m/min, and shaping and cooling the extrudate to obtain the thermoplastic polyurethane hose;
(5) Cutting off the thermoplastic polyurethane hose by a cutting machine, punching on the surface of the hose by a punching machine, bonding the polyurethane air tap at the hole by polyurethane glue, and finally performing closed-loop welding on the hose by a high-frequency plastic welding machine to obtain the thermoplastic polyurethane bicycle inner tube.
2. The thermoplastic polyurethane bicycle inner tube and the preparation method thereof according to claim 1, wherein the solvent of the gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane solution is a mixed solution of absolute ethyl alcohol and deionized water in a volume ratio of 1:1, and the concentration of the gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane is 100 g/L.
3. The thermoplastic polyurethane bicycle inner tube and the preparation method thereof according to claim 1, wherein the anti-aging agent is any one of N-phenyl-2-naphthylamine, N-phenyl-N ʹ -cyclohexyl p-phenylenediamine and a calcium zinc composite stabilizer.
4. The thermoplastic polyurethane bicycle inner tube and the preparation method thereof according to claim 1, wherein the color masterbatch is any one of a macromolecular yellow masterbatch, a sun-proof scarlet masterbatch and a titanium white powder masterbatch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310367021.6A CN116640435A (en) | 2023-04-07 | 2023-04-07 | Thermoplastic polyurethane inner tube of bicycle and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310367021.6A CN116640435A (en) | 2023-04-07 | 2023-04-07 | Thermoplastic polyurethane inner tube of bicycle and preparation method thereof |
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| CN202310367021.6A Pending CN116640435A (en) | 2023-04-07 | 2023-04-07 | Thermoplastic polyurethane inner tube of bicycle and preparation method thereof |
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| CN (1) | CN116640435A (en) |
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