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CN111763302B - TPU (thermoplastic polyurethane) formula for thin film and preparation method thereof - Google Patents

TPU (thermoplastic polyurethane) formula for thin film and preparation method thereof Download PDF

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CN111763302B
CN111763302B CN202010650573.4A CN202010650573A CN111763302B CN 111763302 B CN111763302 B CN 111763302B CN 202010650573 A CN202010650573 A CN 202010650573A CN 111763302 B CN111763302 B CN 111763302B
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antioxidant
corn starch
butanediol
mixing
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CN111763302A (en
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李泽雄
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Qingyuan Xinli Chemical Machinery Co ltd
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
    • C—CHEMISTRY; METALLURGY
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
    • C08G18/6484—Polysaccharides and derivatives thereof
    • C—CHEMISTRY; METALLURGY
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    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6511—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38 compounds of group C08G18/3203
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates
    • C08K5/134—Phenols containing ester groups
    • C08K5/1345—Carboxylic esters of phenolcarboxylic acids
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C08K5/3472—Five-membered rings
    • C08K5/3475—Five-membered rings condensed with carbocyclic rings
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    • C08K5/00—Use of organic ingredients
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    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
    • C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films

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  • Polymers & Plastics (AREA)
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  • Manufacturing & Machinery (AREA)
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  • Compositions Of Macromolecular Compounds (AREA)
  • Polyurethanes Or Polyureas (AREA)
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Abstract

The invention relates to the technical field of high molecular compounds, and particularly discloses a TPU (thermoplastic polyurethane) formula for a film, which comprises the following raw material components in parts by weight: 25-35 parts of bis (4-isocyanatophenyl) methane, 4-6 parts of 1, 4-butanediol, 50-60 parts of dihydric alcohol, 8-12 parts of modified corn starch, 2-3 parts of antioxidant and 1-2 parts of light stabilizer; the preparation method comprises the following steps: drying the raw materials in a drying oven at 80 deg.C for 8 hr; mixing bis (4-isocyanatophenyl) methane and dihydric alcohol, and reacting in the presence of a catalyst to generate a polyurethane prepolymer; and (2) mixing the polyurethane prepolymer with 1, 4-butanediol and modified corn starch in a formula amount, standing for reaction, then mixing with an antioxidant and a light stabilizer, and performing melt extrusion through an extruder to obtain the TPU material for the film. The invention overcomes the defects of the prior art, and the prepared TPU material has high elasticity, better waterproof and moisture-permeable performances when being applied to a film, and has the advantages of simple preparation method, easily obtained raw materials, low price and easy realization.

Description

TPU (thermoplastic polyurethane) formula for thin film and preparation method thereof
Technical Field
The invention relates to the technical field of high molecular compounds, and particularly belongs to a TPU (thermoplastic polyurethane) formula for a film and a preparation method thereof.
Background
Thermoplastic polyurethane elastomers (TPU) are a class of heat-moldable, solvent-soluble polyurethane materials with unique soft and hard block copolymer structures that are widely used in many applications due to their rubber elasticity and plastic processability, for example: external parts of an automobile body, a cable sheath, an adhesive tape, a ski boot, a gear, a rubber tube, a garment material, an inflatable product and the like.
In general, different fields of application have a certain higher demand for TPU materials, such as: the TPU fabric is required to have better waterproof and moisture-permeable performances for clothing and shoe materials, mechanical equipment requires the TPU product to have higher mechanical strength, and inflatable products (such as inflatable cushions, safety chairs, inflatable beds and the like) require the TPU material to have better elasticity and wear resistance.
Therefore, how to prepare TPU materials with high elasticity and better waterproof and moisture-permeable performances is a problem to be solved urgently in the industry.
Disclosure of Invention
The invention aims to provide a TPU formula for a film and a preparation method thereof, overcomes the defects of the prior art, and the prepared TPU material has high elasticity and better waterproof and moisture-permeable performances when being applied to the film, and has the advantages of simple preparation method, easily obtained raw materials, low price and easy realization.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the material comprises the following raw materials in parts by weight: 25-35 parts of bis (4-isocyanatophenyl) methane, 4-6 parts of 1, 4-butanediol, 50-60 parts of dihydric alcohol, 8-12 parts of modified corn starch, 2-3 parts of antioxidant and 1-2 parts of light stabilizer.
Further, the material comprises the following raw material components in parts by weight: 25 parts of bis (4-isocyanatophenyl) methane, 4 parts of 1, 4-butanediol, 60 parts of dihydric alcohol, 8 parts of modified corn starch, 2 parts of antioxidant and 1 part of light stabilizer.
Further, the material comprises the following raw material components in parts by weight: 30 parts of bis (4-isocyanatophenyl) methane, 5 parts of 1, 4-butanediol, 55 parts of dihydric alcohol, 10 parts of modified corn starch, 2.5 parts of antioxidant and 1.5 parts of light stabilizer.
Further, the material comprises the following raw material components in parts by weight: 35 parts of bis (4-isocyanatophenyl) methane, 6 parts of 1, 4-butanediol, 20 parts of dihydric alcohol, 12 parts of modified corn starch, 3 parts of antioxidant and 2 parts of light stabilizer.
Further, the diol consists of 20 wt% of ethylene glycol and 80 wt% of 1, 4-butanediol.
Further, the specific preparation method of the modified corn starch comprises the following steps: adding distilled water with the same amount into corn starch to prepare starch milk, adding a 3% sodium hydroxide aqueous solution to adjust the pH value under the conditions of constant-temperature water bath and stirring, slowly dropwise adding a 12% sodium trimetaphosphate aqueous solution within 2h, slowly dropwise adding propylene oxide after full reaction, naturally cooling after reacting for 24h, adjusting the pH value to be neutral, washing, drying, crushing and sieving to obtain the modified corn starch.
Further, the antioxidant is composed of an antioxidant 1010 and an antioxidant 168 according to a weight ratio of 1: 2.
Further, the light stabilizer is 2- (2' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole.
A preparation method of a TPU formula for a film based on the formula specifically comprises the following steps:
(1) weighing the raw materials according to the formula, and putting the raw materials into a drying oven to be dried for 8 hours at the temperature of 80 ℃;
(2) mixing bis (4-isocyanatophenyl) methane and dihydric alcohol, and reacting in the presence of a catalyst to generate a polyurethane prepolymer;
(3) mixing the polyurethane prepolymer obtained in the step (2) with 1, 4-butanediol and modified corn starch according to the formula amount, and standing for reaction to generate a polyurethane elastomer;
(4) and (4) mixing the polyurethane elastomer obtained in the step (3) with an antioxidant and a light stabilizer, and performing melt extrusion through an extruder to obtain the TPU material for the film.
Further, in the step (2), the catalyst is dibutyltin dilaurate and/or stannous octoate; the catalyst accounts for 0.5% of the total mass.
Compared with the prior art, the invention has the following implementation effects:
1. the TPU material prepared by the formula for the film and the preparation method thereof provided by the invention is applied to the film, has high elasticity and better waterproof moisture permeability, and is simple in preparation method, easy in obtaining of raw materials, low in price and easy to realize.
2. According to the invention, the modified corn starch is added for blending, so that the strength of the TPU material is enhanced, and the water absorption and degradability of the material are improved to a certain extent.
3. According to the invention, the raw materials are dried and then blended, so that the waterproof and moisture-permeable performances of the material are improved.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples, and any modification is within the scope of the present invention without departing from the spirit of the present invention.
Example 1
The TPU formula for the film comprises the following raw materials in parts by weight: 25 parts of bis (4-isocyanatophenyl) methane, 4 parts of 1, 4-butanediol, 60 parts of dihydric alcohol, 8 parts of modified corn starch, 2 parts of antioxidant and 1 part of light stabilizer.
Wherein the dihydric alcohol consists of 20 wt% of ethylene glycol and 80 wt% of 1, 4-butanediol; the specific preparation method of the modified corn starch comprises the following steps: taking 400g of corn starch, adding 400ml of distilled water to prepare starch milk, adding a 3% sodium hydroxide aqueous solution to adjust the pH under the conditions of constant-temperature water bath and stirring, slowly dropwise adding 50ml of 12% sodium trimetaphosphate aqueous solution within 2h, slowly dropwise adding 36ml of propylene oxide after full reaction, naturally cooling after 24h of reaction, adjusting the pH to be neutral, washing, drying, crushing and sieving to obtain modified corn starch; the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 2; the light stabilizer is 2- (2' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole.
The preparation method of the TPU formula for the film specifically comprises the following steps:
(1) weighing the raw materials according to the formula, and putting the raw materials into a drying oven to be dried for 8 hours at the temperature of 80 ℃;
(2) mixing bis (4-isocyanatophenyl) methane and dihydric alcohol, and reacting in the presence of a catalyst to generate a polyurethane prepolymer; wherein the catalyst is dibutyltin dilaurate and/or stannous octoate; the catalyst accounts for 0.5 percent of the total mass;
(3) mixing the polyurethane prepolymer obtained in the step (2) with 1, 4-butanediol and modified corn starch according to the formula amount, and standing for reaction to generate a polyurethane elastomer;
(4) and (4) mixing the polyurethane elastomer obtained in the step (3) with an antioxidant and a light stabilizer, and performing melt extrusion through an extruder to obtain the TPU material for the film.
Example 2
The TPU formula for the film comprises the following raw materials in parts by weight: 30 parts of bis (4-isocyanatophenyl) methane, 5 parts of 1, 4-butanediol, 55 parts of dihydric alcohol, 10 parts of modified corn starch, 2.5 parts of antioxidant and 1.5 parts of light stabilizer.
Wherein the dihydric alcohol consists of 20 wt% of ethylene glycol and 80 wt% of 1, 4-butanediol; the specific preparation method of the modified corn starch comprises the following steps: taking 400g of corn starch, adding 400ml of distilled water to prepare starch milk, adding a 3% sodium hydroxide aqueous solution to adjust the pH under the conditions of constant-temperature water bath and stirring, slowly dropwise adding 50ml of 12% sodium trimetaphosphate aqueous solution within 2h, slowly dropwise adding 36ml of propylene oxide after full reaction, naturally cooling after 24h of reaction, adjusting the pH to be neutral, washing, drying, crushing and sieving to obtain modified corn starch; the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 2; the light stabilizer is 2- (2' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole.
The preparation method of the TPU formula for the film specifically comprises the following steps:
(1) weighing the raw materials according to the formula, and putting the raw materials into a drying oven to be dried for 8 hours at the temperature of 80 ℃;
(2) mixing bis (4-isocyanatophenyl) methane and dihydric alcohol, and reacting in the presence of a catalyst to generate a polyurethane prepolymer; wherein the catalyst is dibutyltin dilaurate and/or stannous octoate; the catalyst accounts for 0.5 percent of the total mass;
(3) mixing the polyurethane prepolymer obtained in the step (2) with 1, 4-butanediol and modified corn starch according to the formula amount, and standing for reaction to generate a polyurethane elastomer;
(4) and (4) mixing the polyurethane elastomer obtained in the step (3) with an antioxidant and a light stabilizer, and performing melt extrusion through an extruder to obtain the TPU material for the film.
Example 3
The TPU formula for the film comprises the following raw materials in parts by weight: 35 parts of bis (4-isocyanatophenyl) methane, 6 parts of 1, 4-butanediol, 20 parts of dihydric alcohol, 12 parts of modified corn starch, 3 parts of antioxidant and 2 parts of light stabilizer.
Wherein the dihydric alcohol consists of 20 wt% of ethylene glycol and 80 wt% of 1, 4-butanediol; the specific preparation method of the modified corn starch comprises the following steps: taking 400g of corn starch, adding 400ml of distilled water to prepare starch milk, adding a 3% sodium hydroxide aqueous solution to adjust the pH under the conditions of constant-temperature water bath and stirring, slowly dropwise adding 50ml of 12% sodium trimetaphosphate aqueous solution within 2h, slowly dropwise adding 36ml of propylene oxide after full reaction, naturally cooling after 24h of reaction, adjusting the pH to be neutral, washing, drying, crushing and sieving to obtain modified corn starch; the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 2; the light stabilizer is 2- (2' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole.
The preparation method of the TPU formula for the film specifically comprises the following steps:
(1) weighing the raw materials according to the formula, and putting the raw materials into a drying oven to be dried for 8 hours at the temperature of 80 ℃;
(2) mixing bis (4-isocyanatophenyl) methane and dihydric alcohol, and reacting in the presence of a catalyst to generate a polyurethane prepolymer; wherein the catalyst is dibutyltin dilaurate and/or stannous octoate; the catalyst accounts for 0.5 percent of the total mass;
(3) mixing the polyurethane prepolymer obtained in the step (2) with 1, 4-butanediol and modified corn starch according to the formula amount, and standing for reaction to generate a polyurethane elastomer;
(4) and (4) mixing the polyurethane elastomer obtained in the step (3) with an antioxidant and a light stabilizer, and performing melt extrusion through an extruder to obtain the TPU material for the film.
Comparative example 1
The materials and preparation process were essentially the same as those of example 3, except that no modified corn starch was added.
Comparative example 2
The materials and preparation process were essentially the same as in example 3, except that the corn starch was not modified.
Comparative example 3
The materials and preparation process were substantially the same as those of example 3, except that the raw materials were not dried in step (1).
Physical detection
Equal amounts of the TPU materials prepared by the methods of examples 1-3 and comparative examples 1-3 are respectively taken to prepare films, and the prepared films are subjected to the following performance tests, and the test results are shown in Table 1:
TABLE 1 statistical table of mechanical property test results
Figure BDA0002574795980000071
As can be seen from Table 1, the TPU material bonding film prepared by the formula and the preparation method provided by the invention has high elasticity and better waterproof and moisture-permeable performances; as can be seen from the comparison of the results of the example 3 and the comparative examples 1-2, the strength and the waterproof and moisture-permeable performance of the material are better improved by adding the modified corn starch; as can be seen from the comparison of the results of example 3 and comparative example 3, the waterproof and moisture-permeable performance of the material can be effectively improved by drying the raw materials before blending.
The foregoing is merely exemplary and illustrative of the present inventive concept and various modifications, additions and substitutions of similar embodiments may be made to the specific embodiments described by those skilled in the art without departing from the inventive concept or exceeding the scope of the claims as defined in the accompanying claims.

Claims (5)

1. A TPU material for films, characterized by: the material comprises the following raw materials in parts by weight:
25 parts of bis (4-isocyanatophenyl) methane, 4 parts of 1, 4-butanediol, 60 parts of dihydric alcohol, 8 parts of modified corn starch, 2 parts of antioxidant and 1 part of light stabilizer;
or comprises the following raw material components in parts by weight:
30 parts of bis (4-isocyanatophenyl) methane, 5 parts of 1, 4-butanediol, 55 parts of dihydric alcohol, 10 parts of modified corn starch, 2.5 parts of antioxidant and 1.5 parts of light stabilizer;
or comprises the following raw material components in parts by weight:
35 parts of bis (4-isocyanatophenyl) methane, 6 parts of 1, 4-butanediol, 20 parts of dihydric alcohol, 12 parts of modified corn starch, 3 parts of antioxidant and 2 parts of light stabilizer;
the dihydric alcohol consists of 20 wt% of ethylene glycol and 80 wt% of 1, 4-butanediol;
the specific preparation method of the modified corn starch comprises the following steps: adding equal amount of distilled water into corn starch to prepare starch milk, adding 3% sodium hydroxide aqueous solution to adjust pH under the conditions of constant-temperature water bath and stirring, slowly dropwise adding 12% sodium trimetaphosphate aqueous solution within 2h, slowly dropwise adding propylene oxide after full reaction, naturally cooling after reacting for 24h, adjusting pH to be neutral, washing, drying, crushing and sieving to obtain modified corn starch;
the preparation method of the TPU material for the film specifically comprises the following steps:
(1) weighing the raw materials according to the formula, and putting the raw materials into a drying oven to be dried for 8 hours at the temperature of 80 ℃;
(2) mixing bis (4-isocyanatophenyl) methane and dihydric alcohol, and reacting in the presence of a catalyst to generate a polyurethane prepolymer;
(3) mixing the polyurethane prepolymer obtained in the step (2) with 1, 4-butanediol and modified corn starch according to the formula amount, and standing for reaction to generate a polyurethane elastomer;
(4) and (4) mixing the polyurethane elastomer obtained in the step (3) with an antioxidant and a light stabilizer, and performing melt extrusion through an extruder to obtain the TPU material for the film.
2. The TPU material for films as set forth in claim 1 wherein: the antioxidant consists of an antioxidant 1010 and an antioxidant 168 according to the weight ratio of 1: 2.
3. The TPU material for films as set forth in claim 1 wherein: the light stabilizer is 2- (2' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole.
4. A method of preparing a TPU material for films as set forth in any of claims 1-3, characterized in that: the method specifically comprises the following steps:
(1) weighing the raw materials according to the formula, and putting the raw materials into a drying oven to be dried for 8 hours at the temperature of 80 ℃;
(2) mixing bis (4-isocyanatophenyl) methane and dihydric alcohol, and reacting in the presence of a catalyst to generate a polyurethane prepolymer;
(3) mixing the polyurethane prepolymer obtained in the step (2) with 1, 4-butanediol and modified corn starch according to the formula amount, and standing for reaction to generate a polyurethane elastomer;
(4) and (4) mixing the polyurethane elastomer obtained in the step (3) with an antioxidant and a light stabilizer, and performing melt extrusion through an extruder to obtain the TPU material for the film.
5. A method of preparing a TPU material for films as set forth in any of claims 1-3, characterized in that: in the step (2), the catalyst is dibutyltin dilaurate and/or stannous octoate; the catalyst accounts for 0.5% of the total mass.
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