Light, thin and flexible TPU film
By combining TPU masterbatch, polypropylene, intercalated montmorillonite, and modified carbon nanotubes, the problem of insufficient tensile strength and mechanical strength of TPU film was solved, and a thin and flexible TPU film with high mechanical properties was achieved.
Patent Information
- Application Number
- CN202511738861.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-02-27
AI Technical Summary
Existing TPU films, while pursuing thinness and flexibility, lack sufficient tensile strength and mechanical strength, making it difficult to meet the requirements of high mechanical performance.
The membrane utilizes TPU masterbatch, polypropylene, intercalated montmorillonite, and modified carbon nanotubes as inorganic hybrid fillers, along with antioxidants and dispersants. Through the compounding of intercalated montmorillonite and modified carbon nanotubes, a three-dimensional network structure is formed, which enhances the membrane's compatibility and mechanical strength.
It significantly improves the tensile properties, mechanical strength, and aging resistance of TPU films, while maintaining their thin and flexible characteristics.
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of polyurethane elastomer film, in particular to a light, thin and flexible TPU film. BACKGROUND
[0002] Thermoplastic polyurethane elastomer (TPU) film has a broad application prospect in the fields of flexible electronics, smart wear and high-end packaging due to its excellent high elasticity, flexibility, wear resistance and environmental protection recyclability.
[0003] With the upgrading of the demand for product lightness and thinness in the downstream industry, the market puts forward higher requirements for the lightness, thinness and flexibility of TPU film, but the existing technology has obvious bottlenecks: in order to pursue lightness, thinness and flexibility, the film material often has the problem of insufficient tensile strength and mechanical strength, and is easy to deform and tear under external force, which is difficult to adapt to high mechanical performance demand scenarios. SUMMARY
[0004] In order to solve the above technical problems, the present application provides a light, thin and flexible TPU film.
[0005] The light, thin and flexible TPU film provided by the present application adopts the following technical solution:
[0006] A light, thin and flexible TPU film comprises the following components by mass fraction:
[0007] 100-120 parts of TPU master batch, 30-40 parts of polypropylene, 8-10 parts of inorganic hybrid filler, 1-3 parts of antioxidant and 1-3 parts of dispersant; the inorganic hybrid filler comprises intercalated montmorillonite and modified carbon nanotube, and the montmorillonite raw material comprises montmorillonite, tetraethyl orthosilicate and modifier.
[0008] By adding polypropylene in the system, the flow of the whole system can be adjusted; the inorganic hybrid filler forms a reinforcing system, the addition of antioxidant can effectively delay aging, and under the action of dispersant, the compatibility of the whole system is improved by promoting the uniform dispersion of each component in the system; the intercalated montmorillonite in the inorganic hybrid filler acts as a two-dimensional sheet material, which can effectively hinder molecular chain slipping and diffusion, and the modified carbon nanotube acts as a one-dimensional nanomaterial, which constructs a three-dimensional network, and the TPU film prepared by compounding the above materials has good tensile resistance and mechanical strength.
[0009] As a preferred, the intercalated montmorillonite is prepared by the following method:
[0010] By adopting the technical scheme, the montmorillonite, ammonia water and anhydrous ethanol are mixed to obtain a montmorillonite dispersion liquid, tetraethyl orthosilicate and anhydrous ethanol are mixed and then added to the montmorillonite dispersion liquid, stirred, filtered, dried to obtain composite montmorillonite particles, the composite montmorillonite particles are mixed with water, dispersed to obtain a composite montmorillonite suspension, sodium hydroxide is used to adjust the composite montmorillonite suspension to be alkaline, then the temperature is increased and magnetic stirring is performed, a modifier is mixed with water and then added to the montmorillonite suspension after stirring, the stirring is continued to react, and after the reaction, the product is washed, centrifuged and dried to obtain intercalated montmorillonite, which improves the dispersibility and stability of the intercalated montmorillonite in the system.
[0011] Preferably, the modifier comprises octadecyl trimethyl ammonium bromide.
[0012] By adopting the technical scheme, octadecyl trimethyl ammonium bromide as a cationic surfactant, has strong ion exchange with the interlayer cation of montmorillonite, the long-chain alkyl group in octadecyl trimethyl ammonium bromide expands the montmorillonite sheet layer, significantly increases the distance between the montmorillonite sheet layers, and makes it easier for the TPU molecular chain to be inserted in the subsequent process, thereby improving the dispersibility and mechanical properties in a synergistic manner, and the long alkyl chain enhances the compatibility with the hydrophobic segment of TPU, reducing the interfacial slip during stretching.
[0013] Preferably, the mass ratio of the montmorillonite, tetraethyl orthosilicate and octadecyl trimethyl ammonium bromide is 2:10:(0.14-0.18).
[0014] By adopting the technical scheme, the mass ratio of the montmorillonite, tetraethyl orthosilicate and octadecyl trimethyl ammonium bromide is preferably within the above range, so that the ion exchange reaction is fully carried out, further improving the interlayer spacing of the montmorillonite, and making the prepared intercalated montmorillonite more stable.
[0015] Preferably, the modified carbon nanotube raw material comprises pyrrole, carbon nanotubes and n-dodecanethiol.
[0016] By adopting the technical scheme, pyrrole is first polymerized on the surface of the carbon nanotubes to form a polypyrrole coating layer, effectively improving the dispersibility of the carbon nanotubes, and then the hydrophobic modification by n-dodecanethiol introduces long-chain alkyl groups on the surface of the carbon nanotubes, improving the compatibility of the system as a whole, and on the other hand, the thiol group further enhances the interfacial bonding, thereby improving the stability of the system as a whole.
[0017] Preferably, the modified carbon nanotube is prepared by the following method:
[0018] The pyrrole is mixed with the carbon nanotube, the ferric chloride is added, and a carbon nanotube composite is obtained through reaction. The n-dodecanethiol is mixed with anhydrous ethanol to obtain an n-dodecanethiol solution. The carbon nanotube composite is added to the n-dodecanethiol solution, and after stirring and reaction, the modified carbon nanotube is obtained through drying.
[0019] Preferably, the mass ratio among the pyrrole, the carbon nanotube and the ferric chloride is 1:(1.5-1.7):0.54.
[0020] By adopting the above technical solution, the mass ratio among the pyrrole, the carbon nanotube and the ferric chloride is preferably within the above range, so that the surface roughness of the system is improved, and the modified carbon nanotube prepared has good hydrophobicity and stability.
[0021] Preferably, the concentration of the n-dodecanethiol in the n-dodecanethiol solution is 0.85-0.95 mol / L.
[0022] By adopting the above technical solution, the concentration of the n-dodecanethiol in the n-dodecanethiol solution is preferably within the above range, so that the grafting reaction is fully carried out, and the modified carbon nanotube prepared has good dispersibility and compatibility.
[0023] Preferably, the mass ratio between the intercalated montmorillonite and the modified carbon nanotube is 1:(0.8-1.0).
[0024] By adopting the above technical solution, the mass ratio between the intercalated montmorillonite and the modified carbon nanotube is preferably within the above range, so that the network structure between the inorganic hybrid fillers is more stable, and a more perfect system can be constructed between the TPU matrix, thereby improving the toughness of the TPU film prepared.
[0025] In summary, the present application includes at least one of the following beneficial technical effects:
[0026] Through the compounding of the TPU master batch, polypropylene and the intercalated montmorillonite-modified carbon nanotube inorganic hybrid filler, and the addition of antioxidants and dispersants, the problems of insufficient tensile properties, mechanical strength and poor aging resistance of the TPU film are improved, and the light, thin and flexible characteristics of the film material are ensured.
[0027] The intercalated montmorillonite is coated with tetraethyl orthosilicate, intercalated with octadecyltrimethylammonium bromide, and regulated with a specific ratio, so that the interlayer spacing is expanded and the dispersion is stable, the compatibility with the TPU matrix is improved, the molecular chain slip and diffusion stress are effectively hindered, and the mechanical strength of the film material is enhanced.
[0028] The modified carbon nanotube is coated with pyrrole and modified with n-dodecanethiol, and forms a three-dimensional reinforcing network with the intercalated montmorillonite, thereby synergistically optimizing the compatibility and interfacial bonding force of the system, and simultaneously improving the tensile properties, toughness and aging resistance of the TPU film. DETAILED DESCRIPTION
[0029] The application is further described in detail below in conjunction with the examples:
[0030] Raw material description: all raw materials in the examples can be obtained by market; antioxidant is antioxidant 1010 (CAS number: 6683-19-8), and dispersant is calcium stearate (CAS number: 1592-23-0).
[0031] Example 1
[0032] Preparation of intercalated montmorillonite:
[0033] 4.86 g of montmorillonite (CAS number: 1318-93-0), 12.5 g of ammonia water and 100 g of anhydrous ethanol were mixed to obtain a montmorillonite dispersion liquid, 24.43 g of tetraethyl orthosilicate (CAS number: 78-10-4) and 50 g of anhydrous ethanol were mixed and stirred uniformly, then added to the montmorillonite dispersion liquid, and then placed for 10 min, then magnetically stirred, and the tetraethyl orthosilicate was hydrolyzed for 6 h, then filtered and dried in an oven at 60°C for 12 h to obtain composite montmorillonite particles; the composite montmorillonite particles were mixed with 150 g of deionized water and ultrasonically dispersed for 30 min to obtain a montmorillonite suspension, sodium hydroxide was added to adjust the pH of the montmorillonite suspension to 12, then the temperature was raised to 70°C, and then magnetically stirred for 2 h, then 0.71 g of modifier octadecyl trimethyl ammonium bromide (CAS number: 1120-02-1) and 10 g of deionized water were mixed and stirred, then added to the magnetically stirred montmorillonite suspension, and then continued to stir for 3 h, then washed repeatedly with anhydrous ethanol, then centrifuged, and then dried at a temperature of 60°C for 12 h, then ground to obtain intercalated montmorillonite.
[0034] Preparation of modified carbon nanotubes:
[0035] 4.93 g of pyrrole (CAS number: 109-97-7) and 7.4 g of carbon nanotubes were mixed and stirred at a speed of 100 rpm for 2 h, then mixed with 2.67 g of ferric chloride and 10 g of anhydrous ethanol to obtain a carbon nanotube composite, n-dodecanethiol (CAS number: 112-55-0) was mixed with anhydrous ethanol to obtain a 0.85 mol / L n-dodecanethiol solution, the carbon nanotube composite was added to 50 g of the n-dodecanethiol solution, stirred and then ultrasonically treated, then placed in a closed environment at room temperature for 5 h, and then dried in an oven at 60°C for 12 h to obtain modified carbon nanotubes.
[0036] Preparation of inorganic hybrid filler:
[0037] 8.33 g of intercalated montmorillonite and 6.67 g of modified carbon nanotubes were mixed and then added to a high-speed mixer, mixed at 800 rpm for 30 min to obtain an inorganic hybrid filler.
[0038] Preparation of a light, thin and flexible TPU film:
[0039] 100 g of TPU masterbatch and 30 g of polypropylene were added to a high-speed mixer and mixed at 1000 rpm for 20 min, then 1 g of antioxidant and 1 g of dispersant were added and mixed for another 10 min, and finally 8 g of inorganic hybrid filler was added and mixed for 30 min to obtain a mixture; the mixture was added to a twin-screw extruder, the screw speed was set to 300 r / min, and after extrusion, water cooling and granulation, TPU composite particles were obtained; the TPU composite particles were added to a single-screw casting film machine, extruded and cooled to set, pulled by a traction machine, and finally wound to obtain a light, thin and flexible TPU film.
[0040] Example 2
[0041] Preparation of intercalated montmorillonite:
[0042] 4.85 g of montmorillonite, 12.5 g of ammonia water and 100 g of anhydrous ethanol were mixed and ultrasonically dispersed to obtain a montmorillonite dispersion liquid; 24.27 g of tetraethyl orthosilicate and 50 g of anhydrous ethanol were mixed and stirred uniformly, then added to the montmorillonite dispersion liquid, and left to stand for 10 min; then magnetic stirring was performed, and the tetraethyl orthosilicate was hydrolyzed for 6 h, then filtered and dried in an oven at 60°C for 12 h to obtain composite montmorillonite particles; the composite montmorillonite particles were mixed with 150 g of deionized water and ultrasonically dispersed for 30 min to obtain a montmorillonite suspension, sodium hydroxide was added to adjust the pH of the montmorillonite suspension to 12, then the temperature was raised to 70°C, and magnetic stirring was performed for 2 h; 0.88 g of modifier octadecyltrimethylammonium bromide and 10 g of deionized water were mixed and stirred, then added to the magnetically stirred montmorillonite suspension, and stirring was continued for 3 h; after the reaction, the product was repeatedly washed with anhydrous ethanol, then centrifuged, dried at 60°C for 12 h, and ground to obtain intercalated montmorillonite.
[0043] Preparation of modified carbon nanotubes:
[0044] 4.63 g of pyrrole was mixed with 7.87 g of carbon nanotubes, stirred at a rotation speed of 100 rpm for 2 h, and then mixed with 2.5 g of iron chloride and 10 g of anhydrous ethanol to obtain a carbon nanotube composite. Dodecanethiol was mixed with anhydrous ethanol to obtain a 0.95 mol / L dodecanethiol solution. The carbon nanotube composite was added to 50 g of the dodecanethiol solution, stirred, and then ultrasonically treated. After standing at room temperature in a sealed environment for 5 h, the mixture was dried in an oven at 60°C for 12 h to obtain modified carbon nanotubes.
[0045] Preparation of inorganic hybrid filler:
[0046] 7.5 g of intercalated montmorillonite was mixed with 7.5 g of modified carbon nanotubes, and then added to a high-speed mixer and mixed at a rotation speed of 800 rpm for 30 min to obtain an inorganic hybrid filler.
[0047] Preparation of light and thin flexible TPU film:
[0048] 120 g of TPU master batch and 40 g of polypropylene were added to a high-speed mixer and mixed at a rotation speed of 1000 rpm for 20 min. Then 3 g of antioxidant and 3 g of dispersant were added and mixed for another 10 min. Finally, 10 g of inorganic hybrid filler was added and mixed for 30 min to obtain a mixture. The mixture was added to a twin-screw extruder, and the screw rotation speed was set to 300 r / min. After extrusion, water cooling, and granulation, TPU composite particles were obtained. The TPU composite particles were added to a single-screw casting film machine, extruded, cooled, and shaped. After being pulled by a traction machine, a light and thin flexible TPU film was obtained.
[0049] Example 3
[0050] Preparation of intercalated montmorillonite:
[0051] 4.87 g of montmorillonite, 12.5 g of ammonia water, and 100 g of anhydrous ethanol were mixed and ultrasonically dispersed to obtain a montmorillonite dispersion. 24.35 g of tetraethyl orthosilicate and 50 g of anhydrous ethanol were mixed and stirred uniformly, and then added to the montmorillonite dispersion. After standing for 10 min, the mixture was magnetically stirred, and the tetraethyl orthosilicate was hydrolyzed for 6 h. Then the mixture was filtered and dried in an oven at 60°C for 12 h to obtain composite montmorillonite particles. The composite montmorillonite particles were mixed with 150 g of deionized water and ultrasonically dispersed for 30 min to obtain a montmorillonite suspension. Sodium hydroxide was added to adjust the pH of the montmorillonite suspension to 12. Then the temperature was raised to 70°C, and the mixture was magnetically stirred for 2 h. 0.76 g of modifier octadecyltrimethylammonium bromide and 10 g of deionized water were mixed and stirred, and then added to the magnetically stirred montmorillonite suspension. The mixture was continuously stirred for 3 h. After the reaction, the mixture was repeatedly washed with anhydrous ethanol, centrifuged, and dried at a temperature of 60°C for 12 h. After grinding, intercalated montmorillonite was obtained.
[0052] Preparation of modified carbon nanotubes:
[0053] 4.78 g of pyrrole was mixed with 7.64 g of carbon nanotubes, stirred at a speed of 100 rpm for 2 h, then mixed with 2.58 g of iron chloride and 10 g of anhydrous ethanol to obtain a carbon nanotube composite, dodecanethiol was mixed with anhydrous ethanol to obtain a 0.9 mol / L dodecanethiol solution, the carbon nanotube composite was added to 50 g of the dodecanethiol solution, stirred and then ultrasonically treated, and then placed in a closed environment at room temperature for 5 h, and then dried in an oven at 60°C for 12 h to obtain modified carbon nanotubes.
[0054] Preparation of inorganic hybrid filler:
[0055] 7.89 g of intercalated montmorillonite was mixed with 7.11 g of modified carbon nanotubes, and then added to a high-speed mixer and mixed at a speed of 800 rpm for 30 min to obtain an inorganic hybrid filler.
[0056] Preparation of light and thin flexible TPU film:
[0057] 110 g of TPU master batch and 35 g of polypropylene were added to a high-speed mixer and mixed at a speed of 1000 rpm for 20 min, then 2 g of antioxidant and 2 g of dispersant were added and mixed for another 10 min, and finally 9 g of inorganic hybrid filler was added and mixed for 30 min to obtain a mixture; the mixture was added to a twin-screw extruder, the screw speed was set to 300 r / min, and after extrusion, water cooling and granulation, TPU composite particles were obtained; the TPU composite particles were added to a single-screw casting film machine, extruded, cooled and shaped, drawn by a traction machine, and finally wound to obtain a light and thin flexible TPU film.
[0058] Example 4
[0059] Example 4 was based on Example 3, and in the preparation of intercalated montmorillonite, the montmorillonite used was 4.92 g, the tetraethyl orthosilicate was 24.59 g, and the octadecyltrimethylammonium bromide was 0.49 g.
[0060] Example 5
[0061] Example 5 was based on Example 3, and in the preparation of intercalated montmorillonite, the montmorillonite used was 4.82 g, the tetraethyl orthosilicate was 24.12 g, and the octadecyltrimethylammonium bromide was 1.06 g.
[0062] Example 6
[0063] Example 6 was based on Example 3, and in the preparation of intercalated montmorillonite, the modifier was replaced by KH550.
[0064] Example 7
[0065] Example 7 is based on Example 3, and in Example 7, the modifier is replaced by KH570 when preparing the intercalated montmorillonite.
[0066] Example 8
[0067] Example 8 is based on Example 3, and in Example 8, the pyrrole used is 5.47 g, the carbon nanotube used is 6.57 g, and the ferric chloride used is 2.96 g when preparing the modified carbon nanotube.
[0068] Example 9
[0069] Example 9 is based on Example 3, and in Example 9, the pyrrole used is 4.24 g, the carbon nanotube used is 8.47 g, and the ferric chloride used is 2.29 g when preparing the modified carbon nanotube.
[0070] Example 10
[0071] Example 10 is based on Example 3, and in Example 10, the concentration of the n-dodecanethiol solution prepared is 0.7 mol / L when preparing the modified carbon nanotube.
[0072] Example 11
[0073] Example 11 is based on Example 3, and in Example 11, the concentration of the n-dodecanethiol solution prepared is 1.1 mol / L when preparing the modified carbon nanotube.
[0074] Example 12
[0075] Example 12 is based on Example 3, and in Example 12, the intercalated montmorillonite used is 9.38 g, and the modified carbon nanotube used is 5.62 g when preparing the inorganic hybrid filler.
[0076] Example 13
[0077] Example 13 is based on Example 3, and in Example 13, the intercalated montmorillonite used is 6.82 g, and the modified carbon nanotube used is 8.18 g when preparing the inorganic hybrid filler.
[0078] Example 14
[0079] Example 14 is based on Example 3, and in Example 14, no modifier is used when preparing the intercalated montmorillonite.
[0080] Example 15
[0081] Example 15 is based on Example 3, and in Example 15, no n-dodecanethiol is used for treatment when preparing the modified carbon nanotube.
[0082] Comparative Example 1
[0083] Comparative Example 1 is based on Example 3, and in Comparative Example 1, the intercalated montmorillonite in the inorganic hybrid filler is replaced by common montmorillonite.
[0084] Comparative Example 2
[0085] Comparative Example 2 is based on Example 3, and in Comparative Example 2, the modified carbon nanotube in the inorganic hybrid filler is replaced by common carbon nanotube.
[0086] Performance test
[0087] For Examples 1-15 and Comparative Examples 1-2, samples are taken and the following performance tests are performed:
[0088] (1) Tensile property test
[0089] The tensile strength of the sample is tested according to GB / T 1040.3-2006, and each sample is tested 3 times, the average value is taken, and the test results are filled in Table 1.
[0090] (2) Tear strength property test
[0091] The tear strength of the sample is tested according to GB / T 529-2008, and each sample is tested 3 times, the average value is taken, and the test results are filled in Table 1.
[0092] (3) Aging resistance property test
[0093] The tensile strength and tear strength of the sample are retested after heat aging treatment according to GB / T 7141-2008, and each sample is tested 3 times, the average value is taken, and the test results are filled in Table 1.
[0094] Table 1 Performance test results of Examples 1-15 and Comparative Examples 1-2 Test item Tensile strength / MPa Tensile strength after heat aging / MPa Tensile strength retention after aging / % Tear strength (kN / m) Example 1 43.9 41.3 94.08 80.8 Example 2 44.2 41.7 94.34 83.2 Example 3 45.0 42.8 95.11 84.0 Example 4 38.4 35.8 93.23 75.0 Example 5 36.9 33.9 91.87 72.6 Example 6 32.3 29.8 92.26 68.4 Example 7 30.1 27.8 92.36 65.8 Example 8 35.0 32.9 94.00 70.7 Example 9 33.3 30.7 92.19 68.3 Example 10 36.7 33.7 91.83 72.0 Example 11 34.8 31.8 91.38 70.5 Example 12 35.4 32.9 92.94 71.1 Example 13 33.1 30.8 93.05 69.8 Example 14 26.6 23.8 89.47 60.4 Example 15 28.8 25.8 89.58 62.1 Comparative Example 1 20.4 18.3 89.71 50.2 Comparative Example 2 22.9 20.2 88.22 55.4
[0095] The tensile strength of Examples 1-3 is all above 43 MPa, indicating that the TPU film prepared by the application has good tensile strength. After heat aging, the tensile strength retention rate of Examples 1-3 is all above 94%, indicating that the TPU film prepared by the application has good aging resistance. The tear strength of Examples 1-3 is all above 80 kN / m, indicating that the TPU prepared by the application has good tear resistance.
[0096] The mass ratio among the montmorillonite, tetraethyl orthosilicate and octadecyl trimethyl ammonium bromide in the embodiment 4 and the embodiment 5 are not within the range defined in the application, when the content of octadecyl trimethyl ammonium bromide is too low, it is difficult to produce sufficient foam, the improvement effect on the spacing between the montmorillonite layers is reduced, the dispersion and compatibility of the montmorillonite in the TPU system is reduced, the agglomeration occurs in the system, and the stability of the prepared TPU film is reduced; when the content of octadecyl trimethyl ammonium bromide is too high, a large amount of foam is produced in the system, and is wrapped on the surface of the montmorillonite, which hinders the ion exchange, the reaction efficiency is reduced, and the overall stability of the system is affected.
[0097] In the embodiment 6 and the embodiment 7, the modifier is replaced by KH550 and KH570 respectively, KH550 is an amino silane coupling agent, and has no strong ion exchange ability of the cationic surfactant, so it is difficult to further improve the spacing between the montmorillonite layers, and the montmorillonite agglomerates in the system; KH570 also has no ion exchange function, and has limited improvement effect on the spacing between the montmorillonite layers, and affects the overall toughness of the system.
[0098] In the preparation of the modified carbon nanotube in the embodiment 8 and the embodiment 9, the mass ratio among the pyrrole, carbon nanotube and ferric chloride is not within the range defined in the application, when the content of the carbon nanotube is too low, the excessive pyrrole is excessively coated on the surface of the carbon nanotube, and is too loose, which leads to the reduction of the combination performance of the carbon nanotube, and affects the overall stability of the system, when the content of the carbon nanotube is too high, the coating of the pyrrole is not complete, and the uniformity is reduced, the surface of the carbon nanotube is exposed and agglomerates, and the overall stability of the system is affected.
[0099] In the preparation of the modified carbon nanotube in the embodiment 10 and the embodiment 11, the concentration of the n-dodecanethiol solution is not within the range defined in the application, when the concentration of the n-dodecanethiol is insufficient, the grafting density is reduced, the modification of the surface of the carbon nanotube is insufficient, and the compatibility is reduced; when the concentration of the n-dodecanethiol is too high, the long alkyl chains are too much, and are intertwined and agglomerated, and the stability is reduced.
[0100] In the preparation of the inorganic hybrid filler in the embodiment 12 and the embodiment 13, the mass ratio between the intercalated montmorillonite and the modified carbon nanotube is not within the range defined in the application, when the amount of the modified carbon nanotube is too low, it is difficult to bridge the dispersed montmorillonite layers, and the stable structure of the three-dimensional network is reduced; when the amount of the modified carbon nanotube is too much, the excessive carbon nanotube agglomerates in the system, and also hinders the uniform dispersion of the montmorillonite layers in the system, the balanced structure of the system is broken, and the stability is reduced.
[0101] In the preparation of the intercalated montmorillonite in the embodiment 14, no modifier is used for treatment, the unmodified montmorillonite is hydrophilic, the spacing between the layers is very small, the montmorillonite agglomerates seriously in the system, and the overall stability of the system is affected.
[0102] In the preparation of modified carbon nanotubes, no dodecanethiol was used for treatment, and the carbon nanotubes coated only by pyrrole had a tendency to agglomerate in the polymer, and it was difficult to stably disperse uniformly in the system, which affected the overall stability of the system.
[0103] In Comparative Example 1, the intercalated montmorillonite in the inorganic hybrid filler was replaced by ordinary montmorillonite, and the interlayer spacing of the ordinary montmorillonite was too small, the TPU molecular chain could not be inserted, and the dispersion in the system was poor, and the overall stability of the system decreased.
[0104] In Comparative Example 2, the modified carbon nanotubes in the inorganic hybrid filler were replaced by ordinary carbon nanotubes, the dispersion of the ordinary carbon nanotubes decreased, and the carbon nanotubes agglomerated in the system, and could not bridge the intercalated montmorillonite, and the performance of the system decreased.
[0105] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited by the content of the specification, and must be determined by the scope of the claims.
Claims
1. A thin, flexible TPU film, characterized in that: The components include the following parts by mass: 100-120 parts TPU masterbatch, 30-40 parts polypropylene, 8-10 parts inorganic hybrid filler, 1-3 parts antioxidant, and 1-3 parts dispersant; The inorganic hybrid filler includes intercalated de-sodium and modified carbon nanotubes, and the montmorillonite raw material includes montmorillonite, tetraethyl orthosilicate and a modifier.
2. The thin and flexible TPU film according to claim 1, characterized in that: The intercalated montmorillonite was prepared using the following method: Montmorillonite, ammonia, and anhydrous ethanol were mixed to obtain a montmorillonite dispersion. Tetraethyl orthosilicate was mixed with anhydrous ethanol and added to the montmorillonite dispersion. After stirring, the mixture was filtered and dried to obtain composite montmorillonite particles. The composite montmorillonite particles were mixed with water and dispersed to obtain a composite montmorillonite suspension. The composite montmorillonite suspension was adjusted to alkalinity using sodium hydroxide, then heated and magnetically stirred. A modifier was mixed with water and added to the magnetically stirred montmorillonite suspension. The reaction was continued with stirring. After the reaction, the mixture was washed, centrifuged, and dried to obtain intercalated montmorillonite.
3. The thin and flexible TPU film according to claim 2, characterized in that: The modifier includes octadecyltrimethylammonium bromide.
4. The thin and flexible TPU film according to claim 3, characterized in that: The mass ratio of montmorillonite, tetraethyl orthosilicate and octadecyltrimethylammonium bromide is 1:5:(0.14-0.18).
5. The thin and flexible TPU film according to claim 1, characterized in that: The modified carbon nanotube raw materials include pyrrole, carbon nanotubes, and n-dodecyl mercaptan.
6. The thin and flexible TPU film according to claim 5, characterized in that: The modified carbon nanotubes were prepared using the following method: Pyrrole was mixed with carbon nanotubes, and ferric chloride was added to react and obtain a carbon nanotube composite. Dodecyl mercaptan was mixed with anhydrous ethanol to obtain a dodecyl mercaptan solution. The carbon nanotube composite was added to the dodecyl mercaptan solution, and after stirring and reacting, it was dried to obtain modified carbon nanotubes.
7. The thin and flexible TPU film according to claim 6, characterized in that: The mass ratio of pyrrole, carbon nanotubes and ferric chloride is 1:(1.5-1.7):0.
54.
8. A thin and flexible TPU film according to claim 6, characterized in that: The concentration of n-dodecyl mercaptan in the n-dodecyl mercaptan solution is 0.85-0.95 mol / L.
9. The thin and flexible TPU film according to claim 1, characterized in that: The mass ratio between the intercalated montmorillonite and the modified carbon nanotubes is 1:(0.8-1.0).