CN112341796A - TPU membrane with corrosion resistance - Google Patents
TPU membrane with corrosion resistance Download PDFInfo
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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
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K2003/2251—Oxides; Hydroxides of metals of chromium
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- C08K3/32—Phosphorus-containing compounds
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- C08K2003/385—Binary compounds of nitrogen with boron
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Abstract
本发明公开了一种具有耐腐蚀性的TPU膜，包括以下重量份数配比的原料：包括以下重量份数配比的原料：热塑性聚氨酯：100‑120份；黄铜：20‑30份；三氧化铬：40‑50份；氮化硼：10‑20份；聚丙烯：100‑120份；磷酸盐：20‑40份；氨基树脂：10‑20份；饱和聚酯树脂：5‑15份；稠化剂：3‑5份；余量为水，将各个原料按照步骤放进反应釜中进行反应。本发明较好的抗腐蚀能力，而聚丙烯和磷酸盐可以增加TPU膜的延展拉伸性加入的三氧化铬和氮化硼可以增加TPU膜的耐高温和抗氧化性。The invention discloses a TPU film with corrosion resistance, which comprises the following raw materials in parts by weight: thermoplastic polyurethane: 100-120 parts; brass: 20-30 parts; Chromium trioxide: 40-50 parts; Boron nitride: 10-20 parts; Polypropylene: 100-120 parts; Phosphate: 20-40 parts; Amino resin: 10-20 parts; Saturated polyester resin: 5-15 parts; thickening agent: 3-5 parts; the balance is water, and each raw material is put into the reaction kettle according to the steps for reaction. The invention has better corrosion resistance, while polypropylene and phosphate can increase the ductility and stretchability of the TPU film. The added chromium trioxide and boron nitride can increase the high temperature resistance and oxidation resistance of the TPU film.
Description
Technical Field
The invention relates to the field of chemical products, in particular to a corrosion-resistant TPU film.
Background
The TPU is increasingly popular with people due to the excellent performance and the environmental protection concept, not only has the excellent characteristics of high tension, high tensile force, toughness and aging resistance, but also is a mature environmental protection material, and at present, the TPU is widely applied to: shoe materials, ready-made clothes, inflatable toys, aquatic and underwater sports equipment, medical equipment, fitness equipment, automobile seat materials, umbrellas, leather suitcases, leather bags and the like.
The TPU membrane in the current market does not have the corrosion resistance, is easily corroded by acidic and basic substances in air or rainwater in the using process, further reduces the service life of the TPU membrane, greatly reduces the practicability, and has the advantages of common high temperature resistance, oxidation resistance and ductility and low practicability.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a TPU film with corrosion resistance, and solves the problems that the TPU film does not have corrosion resistance, high temperature resistance, oxidation resistance and general ductility.
The invention mainly aims to provide a corrosion-resistant TPU film, which comprises the following raw materials in parts by weight: thermoplastic polyurethane: 100-120 parts; brass: 20-30 parts of a solvent; chromium trioxide: 40-50 parts; boron nitride: 10-20 parts; polypropylene: 100-120 parts; phosphate salt: 20-40 parts; amino resin: 10-20 parts; saturated polyester resin: 5-15 parts; a thickening agent: 3-5 parts; the balance of water;
the preparation method of the TPU film with the corrosion resistance comprises the following steps:
the method comprises the following steps: grinding and crushing brass, boron nitride, phosphate and a thickening agent to 100-200 meshes according to parts by weight, sieving again, and cutting thermoplastic polyurethane and amino resin into blocks with the size of about 5 multiplied by 5 mm;
step two: adding chromium trioxide into water according to parts by weight, and stirring for 15 minutes at the temperature of 40 ℃ at a speed of 120-160 r/min to obtain a chromic acid solution;
step three: respectively heating saturated polyester resin and amino resin by bath water at 60 ℃ according to parts by weight, stirring for 15 minutes at a speed of 100-120 r/min, adding the amino resin into the saturated polyester resin while stirring, and stirring for 15-25 minutes at a speed of 100 r/min to obtain a solution A;
step four: preheating a reaction kettle at 60 ℃ for 30-50 minutes, adding the cut thermoplastic polyurethane into the reaction kettle, cooling to 40 ℃, and stirring for 30 minutes at 500-600 r/min;
step five: adding boron nitride, phosphate and a thickening agent into a reaction bottle together according to parts by weight, adding the reaction bottle into an ultrasonic oscillator for oscillation mixing, and obtaining a mixture A after oscillation for 10-30 minutes;
step six: placing the mixture A in a crucible according to the parts by weight, burning the mixture A by using fire at 500 ℃, and taking out the mixture A after the burning lasts for 10-20 minutes to obtain a solution B;
step seven: adding the solution B into a reaction kettle according to the parts by weight, carrying out high temperature treatment at 300 ℃ and pressurizing to 600Pa/m3Stirring for 20-30 minutes at a speed of 600 r/min;
step eight: according to parts by weight, depressurizing the reaction kettle to the normal pressure and the temperature of 100 ℃, filtering the solution A by using a filter screen, adding the solution A into the reaction kettle, stirring the solution A for 30 to 50 minutes at a speed of 500 r/minute, adding the rest of water, and stirring the solution A for 10 to 20 minutes at a speed of 200 r/minute;
step nine: adding brass into a reaction kettle at normal temperature according to parts by weight, stirring for 20-40 minutes at 1000 r/min, filtering and taking out to obtain slurry;
step ten: adding the slurry into a film coating machine to carry out conventional film coating treatment, and obtaining a semi-finished TPU film after the conventional film coating treatment is finished;
step eleven: and soaking the semi-finished TPU film in chromic acid solution for 5-15 minutes, taking out the semi-finished TPU film, and placing the semi-finished TPU film in a drying chamber for drying for 30-50 minutes to obtain the TPU film with the cost.
Preferably, the reaction kettle in the fourth step is made of carbon steel materials, and an anchor stirrer is arranged inside the reaction kettle.
Preferably, the mesh number of the screen in the first step is 150 meshes, and the mesh number of the screen in the ninth step is 200 meshes.
Preferably, the thickening agent in the step one is sorbitol, and the sorbitol is prepared by adopting refined glucose obtained by saccharification of starch and carrying out medium-pressure continuous or batch hydrogenation.
Preferably, the temperature of the drying chamber in the eleventh step is set to be normal temperature, and the oscillation frequency of the ultrasonic oscillator in the fifth step is 10 KHZ.
Preferably, the reaction bottle in the fifth step is made of ceramic or glass, and the slurry in the tenth step is dried at 100 ℃ for 20 minutes before being added into the film coating machine.
1. According to the corrosion-resistant TPU film provided by the invention, when the added brass is soaked in chromic acid solution after film formation, the brass reacts with the chromic acid solution, and chromium sesquioxide or a film containing a small amount of chromium sesquioxide can be generated on the upper surface of the TPU film, so that the TPU film has better corrosion resistance.
2. According to the corrosion-resistant TPU film provided by the invention, the extension stretchability and transparency and heat resistance of the TPU film can be improved through the polypropylene and the phosphate, the high temperature resistance and oxidation resistance of the TPU film can be improved through the added chromium trioxide and boron nitride, the chemical corrosion resistance is good, the application range of the TPU film in various fields can be increased, and the practicability is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
The first embodiment is as follows:
the TPU film with corrosion resistance comprises the following raw materials in parts by weight: thermoplastic polyurethane: 100 parts of (A); brass: 20 parts of (1); chromium trioxide: 40 parts of a mixture; boron nitride: 10 parts of (A); polypropylene: 100 parts of (A); phosphate salt: 20 parts of (1); amino resin: 10 parts of (A); saturated polyester resin: 5 parts of a mixture; a thickening agent: 3 parts of a mixture; the balance being water.
The preparation method of the TPU film with the corrosion resistance comprises the following steps:
the method comprises the following steps: according to the weight parts, the brass, the boron nitride, the phosphate and the thickening agent are respectively ground and crushed to 200 meshes, and then are sieved once, and the thermoplastic polyurethane and the amino resin are cut into blocks with the size of about 5 multiplied by 5 mm.
Step two: according to the parts by weight, the chromic anhydride is added into water and stirred for 15 minutes at 120 r/min under the environment of 40 ℃, and then chromic acid solution is obtained.
Step three: according to parts by weight, respectively heating saturated polyester resin and amino resin in bath water at 60 ℃ and stirring for 15 minutes at 100 r/min, adding the amino resin into the saturated polyester resin while stirring, and stirring for 15 minutes at 100 r/min to obtain a solution A.
Step four: according to the parts by weight, preheating a reaction kettle at 60 ℃ for 30 minutes, adding the cut thermoplastic polyurethane into the reaction kettle, cooling to 40 ℃ and stirring at 500 r/min for 30 minutes.
Step five: adding boron nitride, phosphate and a thickening agent into a reaction bottle together according to parts by weight, adding the reaction bottle into an ultrasonic oscillator for oscillation mixing, and oscillating for 10 minutes to obtain a mixture A.
Step six: placing the mixture A in a crucible according to the parts by weight, burning the mixture A by using fire at 500 ℃, and taking out the mixture A after 10 minutes to obtain a solution B.
Step seven: adding the solution B into a reaction kettle according to the parts by weight, carrying out high temperature treatment at 300 ℃ and pressurizing to 600Pa/m3Then, the mixture was stirred at 600 r/min for 20 minutes.
Step eight: and (2) depressurizing the reaction kettle to the normal pressure and the temperature of 100 ℃ according to the parts by weight, filtering the solution A by using a filter screen, adding the solution A into the reaction kettle, stirring the solution A for 30 minutes at a speed of 500 r/minute, adding the rest of water, and stirring the solution A for 10 minutes at a speed of 200 r/minute.
Step nine: according to the weight parts, the brass is added into a reaction kettle at normal temperature, the mixture is stirred for 20 minutes at 1000 r/min, and then the mixture is filtered and taken out, so that the slurry can be obtained.
Step ten: and adding the slurry into a coating machine to carry out conventional coating treatment, and obtaining a semi-finished TPU film after the conventional coating treatment is finished.
Step eleven: and soaking the semi-finished TPU film in chromic acid solution for 5 minutes, taking out the semi-finished TPU film, and placing the semi-finished TPU film in a drying chamber for drying for 30 minutes to obtain the TPU film with the cost.
Example two:
2. the TPU film with corrosion resistance comprises the following raw materials in parts by weight: thermoplastic polyurethane: 110 parts of (A); brass: 25 parts of (1); chromium trioxide: 45 parts of (1); boron nitride: 15 parts of (1); polypropylene: 110 parts of (A); phosphate salt: 30 parts of (1); amino resin: 15 parts of (1); saturated polyester resin: 10 parts of (A); a thickening agent: 4 parts of a mixture; the balance being water.
The preparation method of the TPU film with the corrosion resistance comprises the following steps:
the method comprises the following steps: according to the weight portion, the brass, the boron nitride, the phosphate and the thickening agent are respectively ground and crushed to 150 meshes, and then are sieved once, and the thermoplastic polyurethane and the amino resin are cut into blocks with the size of about 5 multiplied by 5 mm.
Step two: according to the parts by weight, the chromic anhydride is added into water and stirred for 15 minutes at 140 r/min under the environment of 40 ℃, and then chromic acid solution is obtained.
Step three: according to parts by weight, respectively heating saturated polyester resin and amino resin in bath water at 60 ℃ and stirring for 15 minutes at 110 r/min, adding the amino resin into the saturated polyester resin while stirring, and stirring for 20 minutes at 100 r/min to obtain a solution A.
Step four: according to the parts by weight, preheating a reaction kettle at 60 ℃ for 40 minutes, adding the cut thermoplastic polyurethane into the reaction kettle, cooling to 40 ℃, and stirring at 550 r/min for 30 minutes.
Step five: adding boron nitride, phosphate and a thickening agent into a reaction bottle together according to parts by weight, adding the reaction bottle into an ultrasonic oscillator for oscillation mixing, and oscillating for 20 minutes to obtain a mixture A.
Step six: placing the mixture A in a crucible according to the parts by weight, burning the mixture A by using fire at 500 ℃, and taking out the mixture A after 15 minutes to obtain a solution B.
Step seven: adding the solution B into a reaction kettle according to the parts by weight, carrying out high temperature treatment at 300 ℃ and pressurizing to 600Pa/m3The mixture was stirred at 600 r/min for 25 minutes.
Step eight: and (2) depressurizing the reaction kettle to the normal pressure and the temperature of 100 ℃ according to the parts by weight, filtering the solution A by using a filter screen, adding the solution A into the reaction kettle, stirring for 40 minutes at the speed of 500 r/minute, adding the rest of water, and stirring for 15 minutes at the speed of 200 r/minute.
Step nine: according to the weight portion, the brass is added into a reaction kettle at normal temperature, stirring is carried out for 30 minutes at 1000 r/min, and then the mixture is filtered and taken out, so that the slurry can be obtained.
Step ten: and adding the slurry into a coating machine to carry out conventional coating treatment, and obtaining a semi-finished TPU film after the conventional coating treatment is finished.
Step eleven: and soaking the semi-finished TPU film into chromic acid solution for 10 minutes, taking out the semi-finished TPU film, and placing the semi-finished TPU film in a drying chamber for drying for 40 minutes to obtain the TPU film with the cost.
Example three:
3. the TPU film with corrosion resistance comprises the following raw materials in parts by weight: thermoplastic polyurethane: 120 parts of (A); brass: 30 parts of (1); chromium trioxide: 50 parts of a mixture; boron nitride: 20 parts of (1); polypropylene: 120 parts of (A); phosphate salt: 40 parts of a mixture; amino resin: 20 parts of (1); saturated polyester resin: 15 parts of (1); a thickening agent: 5 parts of a mixture; the balance being water.
The preparation method of the TPU film with the corrosion resistance comprises the following steps:
the method comprises the following steps: according to the weight portion, the brass, the boron nitride, the phosphate and the thickening agent are respectively ground and crushed to 100 meshes, and then are sieved once, and the thermoplastic polyurethane and the amino resin are cut into blocks with the size of about 5 multiplied by 5 mm.
Step two: according to the parts by weight, the chromic anhydride is added into water and stirred for 15 minutes at the temperature of 40 ℃ and at the speed of 160 r/minute, and then chromic acid solution is obtained.
Step three: according to parts by weight, respectively heating saturated polyester resin and amino resin in bath water at 60 ℃ and stirring for 15 minutes at 120 r/min, adding the amino resin into the saturated polyester resin while stirring, and stirring for 25 minutes at 100 r/min to obtain a solution A.
Step four: according to the parts by weight, preheating a reaction kettle for 50 minutes at 60 ℃, adding the cut thermoplastic polyurethane into the reaction kettle, cooling to 40 ℃, and stirring for 30 minutes at 600 r/min.
Step five: adding boron nitride, phosphate and a thickening agent into a reaction bottle together according to parts by weight, adding the reaction bottle into an ultrasonic oscillator for oscillation mixing, and oscillating for 30 minutes to obtain a mixture A.
Step six: placing the mixture A in a crucible according to the parts by weight, burning the mixture A by using fire at 500 ℃, and taking out the mixture A after the burning lasts for 20 minutes to obtain a solution B.
Step seven: adding the solution B into a reaction kettle according to the parts by weight, carrying out high temperature treatment at 300 ℃ and pressurizing to 600Pa/m3Then, the mixture was stirred at 600 r/min for 30 minutes.
Step eight: and (2) depressurizing the reaction kettle to the normal pressure and the temperature of 100 ℃ according to the parts by weight, filtering the solution A by using a filter screen, adding the solution A into the reaction kettle, stirring for 50 minutes at the speed of 500 r/minute, adding the rest of water, and stirring for 20 minutes at the speed of 200 r/minute.
Step nine: according to the weight parts, the brass is added into a reaction kettle at normal temperature, stirred for 40 minutes at 1000 r/min, filtered and taken out, and the slurry is obtained.
Step ten: and adding the slurry into a coating machine to carry out conventional coating treatment, and obtaining a semi-finished TPU film after the conventional coating treatment is finished.
Step eleven: and soaking the semi-finished TPU film into a chromic acid solution for 15 minutes, taking out the semi-finished TPU film, and placing the semi-finished TPU film in a drying chamber for drying for 50 minutes to obtain the TPU film with the cost.
The preparation method of the embodiment has the advantages that the mixing sequence and the mixing conditions of all the substances are reasonable, so that the materials are fully mixed, the corrosion resistance is good when the preparation method is used, and the corrosion speed is high when the preparation method is corroded.
The experiment is as follows:
equal amounts of example one, example two and example three and the ordinary TPU film were placed in the same corrosive environment for 5 hours, 10 hours and 15 hours, respectively, and the data was recorded.
As a result: the TPU film in the third example has no obvious reaction within 5 hours, 10 hours and 15 hours in a corrosive environment, the TPU film in the second example has no obvious reaction within 5 hours in the corrosive environment, has a slight corrosion reaction within 10 hours and a moderate corrosion reaction within 15 hours, the TPU film in the first example has a slight corrosion reaction within 5 hours in the corrosive environment and has a moderate corrosion reaction within 10 hours and 15 hours, and the common TPU film has a moderate corrosion reaction within 5 hours and 10 hours in the corrosive environment and has a severe corrosion reaction within 15 hours, so that the prepared TPU film in the third example has better corrosion resistance, and the corrosion resistance of the TPU film with corrosion resistance is far higher than that of the common TPU film.
Experiment two:
equivalent amounts of the first, second and third example and the common TPU film were placed in an environment at 60 degrees celsius, 100 degrees celsius and 140 degrees celsius, respectively, and then taken out after 1 hour, and the data was recorded.
As a result: the TPU film in the first example is taken out after being placed in an environment of 60 ℃ for 1 hour and has no obvious damage mark, the TPU film in the second example is taken out after being placed in an environment of 100 ℃ for 1 hour and has no obvious damage mark after being placed in an environment of 100 ℃ for 1 hour, the TPU film in the second example is taken out after being placed in an environment of 60 ℃ and 100 ℃ for 1 hour and has no obvious damage mark, the TPU film in the third example is taken out after being placed in an environment of 140 ℃ for 1 hour and has no obvious damage mark, the common TPU film is taken out after being placed in an environment of 60 ℃ and 100 ℃ for 1 hour and has all medium foaming and wrinkling marks, and the TPU film in the third example is taken out after being placed in an environment of 140 ℃ for 1 hour and has severe foaming and wrinkling marks, therefore, the TPU film prepared in example three has better high temperature resistance, and the high temperature resistance of the TPU film with corrosion resistance of the invention is higher than that of the common TPU film.
Experiment three: the surfaces of equivalent amounts of the first, second and third example and the conventional TPU film were observed after one hour of application of three concentrations of the oxidizing agent, low, medium and high, and the data were recorded.
As a result: the TPU film in the first embodiment has no obvious oxidation trace on the surface after being coated with the low-concentration oxidizing agent and placed for one hour, has a slight oxidation trace on the surface after being coated with the medium-concentration oxidizing agent and placed for one hour, the TPU film in the second embodiment has no obvious oxidation trace on the surface after being coated with the low-concentration oxidizing agent and the medium-concentration oxidizing agent and placed for one hour, has a slight oxidation trace on the surface after being coated with the high-concentration oxidizing agent and placed for one hour, the TPU film in the third embodiment has no obvious oxidation trace on the surface after being coated with the low-concentration oxidizing agent and the medium-concentration oxidizing agent and placed for one hour, the surface of the common TPU film has a moderate oxidation phenomenon after being coated with the low-concentration oxidizing agent and the medium-concentration oxidizing agent and placed for one hour, and the surface of the common TPU film has a severe oxidation phenomenon after being coated with the high-concentration oxidizing agent and placed for one hour, so the TPU film prepared in the third embodiment has better oxidation resistance, the TPU film with corrosion resistance of the invention has higher oxidation resistance than the common TPU film.
Experiment four: the TPU films of the first embodiment, the second embodiment and the third embodiment with equal length and the common TPU film are respectively pulled by a pulling machine, and the data are recorded.
As a result: the TPU film in the first embodiment is stretched to 2 times the original length and then broken, the TPU film in the second embodiment is stretched to 2.5 times the original length and then broken, the TPU film in the third embodiment is stretched to 3 times the original length and then broken, and the common TPU film is stretched to 1 time the original length and then broken, so that the TPU film prepared in the third embodiment has better stretching performance, and compared with the common TPU film, the corrosion-resistant TPU film of the invention has higher stretching performance than the common TPU film.
The invention has the beneficial effects that: when the brass added in the preparation process is soaked in chromic acid solution after film forming, the brass reacts with the chromic acid solution, chromium sesquioxide with the diameter of several to several hundred micrometers or a film containing a small amount of chromium sesquioxide can be generated on the upper surface of the TPU film, the corrosion resistance of the TPU film is better, the ductility, transparency and heat resistance of the TPU film can be improved by polypropylene and phosphate, the high temperature resistance, oxidation resistance and chemical corrosion resistance of the TPU film can be improved by the added chromium trioxide and boron nitride, the application range of the TPU film in various fields can be increased, the practicability is increased, the solvent in the sizing agent can be evaporated by drying at 100 ℃ for 20 minutes before the sizing agent is added into a film coating machine in the step ten, and the forming speed of the TPU film is increased.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A TPU film having corrosion resistance characterized by: the material comprises the following raw materials in parts by weight: thermoplastic polyurethane: 100-120 parts; brass: 20-30 parts of a solvent; chromium trioxide: 40-50 parts; boron nitride: 10-20 parts; polypropylene: 100-120 parts; phosphate salt: 20-40 parts; amino resin: 10-20 parts; saturated polyester resin: 5-15 parts; a thickening agent: 3-5 parts; the balance of water;
the preparation method of the TPU film with the corrosion resistance comprises the following steps:
the method comprises the following steps: grinding and crushing brass, boron nitride, phosphate and a thickening agent to 100-200 meshes according to parts by weight, sieving again, and cutting thermoplastic polyurethane and amino resin into blocks with the size of about 5 multiplied by 5 mm;
step two: adding chromium trioxide into water according to parts by weight, and stirring for 15 minutes at the temperature of 40 ℃ at a speed of 120-160 r/min to obtain a chromic acid solution;
step three: respectively heating saturated polyester resin and amino resin by bath water at 60 ℃ according to parts by weight, stirring for 15 minutes at a speed of 100-120 r/min, adding the amino resin into the saturated polyester resin while stirring, and stirring for 15-25 minutes at a speed of 100 r/min to obtain a solution A;
step four: preheating a reaction kettle at 60 ℃ for 30-50 minutes, adding the cut thermoplastic polyurethane into the reaction kettle, cooling to 40 ℃, and stirring for 30 minutes at 500-600 r/min;
step five: adding boron nitride, phosphate and a thickening agent into a reaction bottle together according to parts by weight, adding the reaction bottle into an ultrasonic oscillator for oscillation mixing, and obtaining a mixture A after oscillation for 10-30 minutes;
step six: placing the mixture A in a crucible according to the parts by weight, burning the mixture A by using fire at 500 ℃, and taking out the mixture A after the burning lasts for 10-20 minutes to obtain a solution B;
step seven: adding the solution B into a reaction kettle according to the parts by weight, carrying out high temperature treatment at 300 ℃ and pressurizing to 600Pa/m3Stirring for 20-30 minutes at a speed of 600 r/min;
step eight: according to parts by weight, depressurizing the reaction kettle to the normal pressure and the temperature of 100 ℃, filtering the solution A by using a filter screen, adding the solution A into the reaction kettle, stirring the solution A for 30 to 50 minutes at a speed of 500 r/minute, adding the rest of water, and stirring the solution A for 10 to 20 minutes at a speed of 200 r/minute;
step nine: adding brass into a reaction kettle at normal temperature according to parts by weight, stirring for 20-40 minutes at 1000 r/min, filtering and taking out to obtain slurry;
step ten: adding the slurry into a film coating machine to carry out conventional film coating treatment, and obtaining a semi-finished TPU film after the conventional film coating treatment is finished;
step eleven: and soaking the semi-finished TPU film in chromic acid solution for 5-15 minutes, taking out the semi-finished TPU film, and placing the semi-finished TPU film in a drying chamber for drying for 30-50 minutes to obtain the TPU film with the cost.
2. The TPU film of claim 1 having corrosion resistance, wherein: and the reaction kettle in the fourth step is made of carbon steel materials, and an anchor stirrer is arranged in the reaction kettle.
3. The TPU film of claim 1 having corrosion resistance, wherein: the mesh number of the screen in the first step is 150 meshes, and the mesh number of the screen in the ninth step is 200 meshes.
4. The TPU film of claim 1 having corrosion resistance, wherein: in the first step, the thickening agent is sorbitol, and the sorbitol is prepared by adopting refined glucose obtained by saccharifying starch and carrying out medium-pressure continuous or intermittent hydrogenation.
5. The TPU film of claim 1 having corrosion resistance, wherein: and in the eleventh step, the temperature of the drying chamber is set to be 30 ℃, and the oscillation frequency of the ultrasonic oscillator is 10KHZ in the fifth step.
6. The TPU film of claim 1 having corrosion resistance, wherein: and the reaction bottle in the fifth step is made of ceramic or glass container, and the slurry in the tenth step is dried for 20 minutes at 100 ℃ before being added into the film coating machine.
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