High-swelling-resistance waterproof moisture-permeable medical TPU film and preparation method thereof

Abstract

According to the high-swelling-resistance waterproof moisture-permeable medical TPU film and the preparation method thereof, the preparation raw materials comprise the following components in parts by weight: 30-40 parts of polyester type TPU, 30-40 parts of moisture-permeable polyether type TPU, 0.5-2 parts of peroxide, 0.5-2 parts of a slipping agent, 5-10 parts of white carbon black and 1-5 parts of an anti-hydrolysis agent; the hardness of the polyester TPU resin and the moisture-permeable polyether type TPU resin is 75-95 shore A, the number-average molecular weight of the polyester TPU resin and the moisture-permeable polyether type TPU resin is 50,000-20,000 Dal, and the component of a soft segment of the moisture-permeable polyether type TPU resin is polyethylene glycol. The preparation method comprises the following steps: uniformly mixing the raw materials, baking the mixed material at 90-110 DEG C for 4-10 hours, and introducing the material into a single-screw melt extruder of a film blowing machine by using a pumping machine to enter a die head; and carrying out blowing, cooling, stretching, sizing and rolling on the melt extruded from the die orifice. And the prepared TPU film has good waterproof, moisture permeable and anti-swelling properties, and can be used in the medical field.

Description

Technical Field

[0001] The invention relates to the field of TPU films, and in particular to a highly anti-swelling, waterproof and moisture-permeable medical TPU film and a preparation method thereof. Background Art

[0002] Thermoplastic polyurethane (TPU) is a polymer material with excellent mechanical properties, chemical resistance, wear resistance, hydrolysis resistance and oil resistance. TPU film has excellent transparency, flexibility, wear resistance and weather resistance, and is widely used in medical, electronic, automotive, construction and other fields. However, traditional TPU films are basically waterproof, but if the moisture permeability is increased, it will lead to weak anti-swelling performance and damage the flatness of the film. In particular, TPU films used in the medical field have high requirements for anti-swelling, waterproof and moisture permeability, but there is still no TPU film in the industry that can take into account the above high performance.

[0003] In view of this, the inventor conducted in-depth research on the above-mentioned defects in the prior art, and thus came up with this case. Summary of the invention

[0004] In order to solve the above technical problems, we proposed a highly anti-swelling, waterproof and breathable medical TPU film and its preparation method. The prepared TPU film has excellent waterproof and breathable properties and anti-swelling properties, as well as good mechanical properties and chemical resistance. It is resistant to oil penetration and not easy to puncture, and can meet the use requirements in the medical field.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A highly anti-swelling, waterproof and breathable medical TPU film, wherein the raw materials for preparing the film include the following components in parts by weight: 30-40 parts of polyester TPU, 30-40 parts of breathable polyether TPU, 0.5-2 parts of peroxide, 0.5-2 parts of lubricant, 5-10 parts of white carbon black and 1-5 parts of anti-hydrolysis agent; the polyester TPU resin is a polyester with a hardness range of 75-95 shore A and a number average molecular weight of 50000-200000 Da l; the breathable polyether TPU resin is a polyester with a hardness range of 75-95 shore A, and its soft segment component is polyethylene glycol with a number average molecular weight of 50000-200000 Da l.

[0007] Preferably, the hard segment components of the polyester TPU and the moisture-permeable polyether TPU are both diphenylmethane diisocyanate, and the chain extender is one or more combinations of butanediol, propylene glycol, and ethylene glycol.

[0008] Preferably, the peroxide is one or more combinations of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, 1,4-bis(tert-butylperoxyisopropylbenzene), 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, and tetra-tert-butyl-2,2-dicyclohexylpropane.

[0009] Preferably, the lubricant is one or more combinations of erucamide, oleamide, diethylene bisstearamide, and stearamide.

[0010] Preferably, the white carbon black is spherical silica with a particle size of 500nm-10μm.

[0011] Preferably, the anti-hydrolysis agent is one or a combination of carbodiimide and polycarbodiimide.

[0012] A method for preparing a highly anti-swelling, waterproof and breathable medical TPU film comprises the following steps:

[0013] The first step is to uniformly mix 30-40 parts of polyester TPU, 30-40 parts of moisture-permeable polyether TPU, 0.5-2 parts of peroxide, 0.5-2 parts of lubricant, 5-10 parts of white carbon black, and 1-5 parts of anti-hydrolysis agent to obtain a mixed material;

[0014] The second step is to bake the mixture in an oven at 90-110 degrees for 4-10 hours, and then use the dehumidified hot air to further remove moisture;

[0015] The third step is to introduce the dried mixed material into the single screw melt extruder of the film blowing machine through a pump, and then enter the head and die head of the film blowing machine;

[0016] The fourth step is to inflate, cool, stretch, shape and roll the melt extruded through the die head to obtain a finished film.

[0017] Preferably, in the first step, the polyester TPU and the moisture-permeable polyether TPU hard segment components are both diphenylmethane diisocyanate, the chain extender is one or more combinations of butanediol, propylene glycol, and ethylene glycol; the peroxide is one or more combinations of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, 1,4-bis(tert-butylperoxyisopropylbenzene), 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, and tetra-tert-butyl-2,2-dicyclohexylpropane; the lubricant is one or more combinations of erucamide, oleamide, diethylenebisstearamide, and stearamide; the white carbon black is spherical silica with a particle size of 500nm-10μm; the anti-hydrolysis agent is one or two combinations of carbodiimide and polycarbodiimide.

[0018] Through the above technical scheme, the present invention adopts polyester TPU whose soft segment is polyester polyol, and the ester bond has certain structural rigidity, so that the polyester TPU has good mechanical strength and dimensional stability. The polyether TPU adopted has a highly hygroscopic soft segment PEG, which is more hydrophilic than the polyester segment. At the same time, the presence of ether bonds is conducive to the passage of water molecules, so the polyether type has high moisture permeability, but after contacting oil and water, it is easy to penetrate between the molecular segments, and swelling is inevitable, thereby wrinkling and loss of flatness, which limits its use. After the two are mixed, peroxide is introduced. After heating, the peroxide will decompose to form free radicals. The free radicals of the peroxide form CC bonds between the methylene groups of diphenylmethane diisocyanate to form a whole by chemically crosslinking the polyester TPU and the polyether TPU. The bond energy of the CC transverse crosslink is greater than the hydrogen bond, which greatly improves its tear strength, and the large crosslinked network greatly improves its anti-swelling performance. Spherical silica as white carbon black gives TPU good impact elasticity and low compression permanent deformation, while improving wear resistance, allowing TPU film to recover deformation faster after repeated use. Polyester-type TPU resin contains ester bonds that are easily hydrolyzed. The carboxyl groups generated by the hydrolyzed ester bonds gradually increase the acid value of the system, and the acid in turn promotes hydrolysis. Anti-hydrolysis agents such as carbodiimide and polycarbodiimide can react with carboxyl groups and link broken molecular segments, greatly improving their anti-hydrolysis properties.

[0019] Therefore, the highly anti-swelling, waterproof and breathable medical TPU film prepared by the present invention has the following characteristics:

[0020] Beneficial effects:

[0021] (1) Excellent waterproof and breathable performance, which can effectively prevent water and dirt, but at the same time has a certain degree of moisture permeability.

[0022] (2) High anti-swelling performance, preventing swelling and deformation during long-term use in complex environments.

[0023] (3) Good mechanical properties and chemical resistance, with the characteristics of resistance to oil penetration and not easy to puncture, meeting the requirements of use in the medical field.

[0024] (4) The preparation method is simple, easy to industrialize, and the raw materials are environmentally friendly and harmless, without volatile substances. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention is further described in detail below with reference to examples and specific implementation modes.

[0027] Example 1.

[0028] A highly anti-swelling, waterproof and breathable medical TPU film, wherein the raw materials for its preparation include the following components in parts by weight: 30 parts of polyester TPU, 30 parts of breathable polyether TPU, 0.5 parts of peroxide, 0.5 parts of lubricant, 5 parts of white carbon black and 1 part of anti-hydrolysis agent; the polyester TPU resin and the breathable polyether TPU resin both have a hardness of 75-95 shore A and a number average molecular weight of 50000-200000 Da l, and the breathable polyether TPU soft segment component is polyethylene glycol.

[0029] The polyester TPU and the moisture permeable polyether TPU hard segment components are both diphenylmethane diisocyanate, and the chain extender is butanediol. The peroxide is 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane. The lubricant is erucic acid amide. The white carbon black is spherical silica with a particle size of 500nm-10μm. The anti-hydrolysis agent is carbodiimide.

[0030] A method for preparing a highly anti-swelling, waterproof and breathable medical TPU film according to the above raw material components comprises the following steps:

[0031] The first step is to uniformly mix 30 parts of polyester TPU, 30 parts of moisture permeable polyether TPU, 0.5 parts of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, 0.5 parts of erucic acid amide, silicon dioxide, 5 parts of spherical silicon dioxide with a particle size of 500nm-10μm, and 1 part of carbodiimide to obtain a mixed material; the polyester TPU resin and the moisture permeable polyether TPU resin both have a hardness of 75-95 shore A, a number average molecular weight of 50000-200000 Da l, and the soft segment component of the moisture permeable polyether TPU is polyethylene glycol.

[0032] The second step is to bake the mixture in an oven at 90 degrees for 10 hours, and then use dehumidified hot air to further remove moisture;

[0033] The third step is to introduce the dried mixed material into the single screw melt extruder of the film blowing machine through a pump, and then enter the head and die head of the film blowing machine;

[0034] The fourth step is to inflate, cool, stretch, shape and roll the melt extruded through the die head to obtain a finished film.

[0035] Example 2.

[0036] A highly anti-swelling, waterproof and breathable medical TPU film, wherein the raw materials for preparing the film include the following components in parts by weight: 35 parts of polyester TPU, 30 parts of breathable polyether TPU, 0.8 parts of peroxide, 0.6 parts of lubricant, 7 parts of white carbon black and 2 parts of anti-hydrolysis agent; the polyester TPU resin and the breathable polyether TPU resin both have a hardness of 75-95 shore A and a number average molecular weight of 50000-200000 Da l, and the soft segment component of the breathable polyether TPU is polyethylene glycol.

[0037] The polyester TPU and the moisture permeable polyether TPU hard segment components are both diphenylmethane diisocyanate, and the chain extender is propylene glycol. The peroxide is 1,4-bis(tert-butylperoxyisopropylbenzene). The lubricant is oleic acid amide. The white carbon black is spherical silica with a particle size of 500nm-10μm. The anti-hydrolysis agent is polycarbodiimide.

[0038] A method for preparing a highly anti-swelling, waterproof and breathable medical TPU film according to the above raw material components comprises the following steps:

[0039] The first step is to uniformly mix 35 parts of polyester TPU, 30 parts of moisture-permeable polyether TPU, 0.8 parts of 1,4-bis(tert-butylperoxyisopropylbenzene), 0.6 parts of oleic acid amide, 7 parts of spherical silica with a particle size of 500nm-10μm, and 2 parts of polycarbodiimide to obtain a mixed material;

[0040] The second step is to bake the mixture in an oven at 100 degrees for 7 hours, and then use dehumidified hot air to further remove moisture;

[0041] The third step is to introduce the dried mixed material into the single screw melt extruder of the film blowing machine through a pump, and then enter the head and die head of the film blowing machine;

[0042] The fourth step is to inflate, cool, stretch, shape and roll the melt extruded through the die head to obtain a finished film.

[0043] Example 3.

[0044] A highly anti-swelling, waterproof and breathable medical TPU film, wherein the raw materials for preparing the film include the following components in parts by weight: 30 parts of polyester TPU, 35 parts of breathable polyether TPU, 1 part of peroxide, 1 part of lubricant, 6 parts of white carbon black and 3 parts of anti-hydrolysis agent; the polyester TPU resin and the breathable polyether TPU resin both have a hardness of 75-95 shore A and a number average molecular weight of 50000-200000 Da l, and the soft segment component of the breathable polyether TPU is polyethylene glycol.

[0045] The polyester TPU and the moisture permeable polyether TPU hard segment components are both diphenylmethane diisocyanate, and the chain extender is ethylene glycol. The peroxide is 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane. The lubricant is diethylene bisstearic acid amide. The white carbon black is spherical silica with a particle size of 500nm-10μm. The anti-hydrolysis agent is a combination of carbodiimide and polycarbodiimide.

[0046] A method for preparing a highly anti-swelling, waterproof and breathable medical TPU film according to the above raw material components comprises the following steps:

[0047] The first step is to uniformly mix 30 parts of polyester TPU, 35 parts of moisture-permeable polyether TPU, 1 part of 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, 1 part of diethylenebisstearamide, 6 parts of spherical silica with a particle size of 500nm-10μm, and 3 parts of a combination of carbodiimide and polycarbodiimide to obtain a mixed material;

[0048] The second step is to bake the mixture in an oven at 95 degrees for 9 hours, and then use dehumidified hot air to further remove moisture;

[0049] The third step is to introduce the dried mixed material into the single screw melt extruder of the film blowing machine through a pump, and then enter the head and die head of the film blowing machine;

[0050] The fourth step is to inflate, cool, stretch, shape and roll the melt extruded through the die head to obtain a finished film.

[0051] Example 4.

[0052] A highly anti-swelling, waterproof and breathable medical TPU film, wherein the raw materials for its preparation include the following components in parts by weight: 38 parts of polyester TPU, 40 parts of breathable polyether TPU, 1.5 parts of peroxide, 1.5 parts of lubricant, 8 parts of white carbon black, and 4 parts of anti-hydrolysis agent; the polyester TPU resin and the breathable polyether TPU resin both have a hardness of 75-95 shore A and a number average molecular weight of 50000-200000 Da l, and the breathable polyether TPU soft segment component is polyethylene glycol.

[0053] The polyester TPU and the moisture permeable polyether TPU hard segment components are both diphenylmethane diisocyanate, and the chain extender is a combination of butanediol and propylene glycol. The peroxide is 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane. The lubricant is stearic acid amide. The white carbon black is spherical silica with a particle size of 500nm-10μm. The anti-hydrolysis agent is one or a combination of carbodiimide and polycarbodiimide.

[0054] A method for preparing a highly anti-swelling, waterproof and breathable medical TPU film according to the above raw material components comprises the following steps:

[0055] The first step is to uniformly mix 38 parts of polyester TPU, 40 parts of moisture-permeable polyether TPU, 1.5 parts of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, 1.5 parts of stearic acid amide, 8 parts of spherical silica with a particle size of 500nm-10μm, and 4 parts of polycarbodiimide to obtain a mixed material;

[0056] The second step is to bake the mixture in an oven at 105 degrees for 5 hours, and then use dehumidified hot air to further remove moisture;

[0057] The third step is to introduce the dried mixed material into the single screw melt extruder of the film blowing machine through a pump, and then enter the head and die head of the film blowing machine;

[0058] The fourth step is to inflate, cool, stretch, shape and roll the melt extruded through the die head to obtain a finished film.

[0059] Example 5.

[0060] A highly anti-swelling, waterproof and breathable medical TPU film, wherein the raw materials for preparing the film include the following components in parts by weight: 40 parts of polyester TPU, 36 parts of breathable polyether TPU, 2 parts of peroxide, 2 parts of lubricant, 10 parts of white carbon black and 5 parts of anti-hydrolysis agent; the polyester TPU resin and the breathable polyether TPU resin both have a hardness of 75-95 shore A and a number average molecular weight of 50000-200000 Da l, and the soft segment component of the breathable polyether TPU is polyethylene glycol.

[0061] The polyester TPU and the moisture permeable polyether TPU hard segment components are both diphenylmethane diisocyanate, and the chain extender is a combination of propylene glycol and ethylene glycol. The peroxide is tetra-tert-butyl-2,2-dicyclohexylpropane. The lubricant is a combination of erucic acid amide and oleic acid amide. The white carbon black is spherical silica with a particle size of 500nm-10μm. The anti-hydrolysis agent is carbodiimide.

[0062] A method for preparing a highly anti-swelling, waterproof and breathable medical TPU film according to the above raw material components comprises the following steps:

[0063] The first step is to uniformly mix 40 parts of polyester TPU, 36 parts of moisture-permeable polyether TPU, 2 parts of tetra-tert-butyl-2,2-dicyclohexylpropane, 2 parts of a combination of erucamide and oleamide, 10 parts of spherical silica with a particle size of 500nm-10μm, and 5 parts of carbodiimide to obtain a mixed material;

[0064] Step 2: Bake the mixture in an oven at 110 degrees for 4 hours, and then use dehumidified hot air to further remove moisture;

[0065] The third step is to introduce the dried mixed material into the single screw melt extruder of the film blowing machine through a pump, and then enter the head and die head of the film blowing machine;

[0066] The fourth step is to inflate, cool, stretch, shape and roll the melt extruded through the die head to obtain a finished film.

[0067] Of course, in the above-mentioned several embodiments, the polyester TPU and the moisture-permeable polyether TPU hard segment components are all diphenylmethane diisocyanate, and the chain extender can be one or more combinations of butanediol, propylene glycol, and ethylene glycol. The peroxide can be one or more combinations of 2,5-bis (tert-butyl peroxy)-2,5-dimethylhexane, 1,4-bis (tert-butyl peroxy isopropylbenzene), 1,1-di-tert-butyl peroxy-3,3,5-trimethylcyclohexane, 2,5-bis (tert-butyl peroxy)-2,5-dimethylhexane, and tetra-tert-butyl-2,2-dicyclohexylpropane. The lubricant can be one or more combinations of erucic acid amide, oleic acid amide, diethylene bis stearic acid amide, and stearic acid amide. The anti-hydrolysis agent can be one or two combinations of carbodiimide and polycarbodiimide. Here, there will be no special limitation on the above, and these all belong to the protection scope of the present invention.

[0068] At the same time, in the above-mentioned several embodiments, the present invention adopts polyester TPU whose soft segment is polyester polyol, and the ester bond has certain structural rigidity, so that the polyester TPU has good mechanical strength and dimensional stability. The polyether TPU adopted has a highly hygroscopic soft segment PEG, which is more hydrophilic than the polyester segment. At the same time, the presence of ether bonds is conducive to the passage of water molecules, so the polyether type has a high moisture permeability, but after contacting oil and water, it is easy to penetrate between the molecular segments, and swelling is inevitable, resulting in wrinkling and loss of flatness, which limits its use. After the two are mixed, peroxide is introduced. After heating, the peroxide will decompose to form free radicals. The free radicals of the peroxide form CC bonds between the methylene groups of diphenylmethane diisocyanate to form a whole by chemically crosslinking the polyester TPU and the polyether TPU. The bond energy of the CC transverse crosslink is greater than the hydrogen bond, which greatly improves its tear strength. At the same time, the large crosslinked network greatly improves its anti-swelling performance. Spherical silica as white carbon black gives TPU good impact elasticity and low compression permanent deformation, while improving wear resistance, allowing TPU film to recover deformation faster after repeated use. Polyester-type TPU resin contains ester bonds that are easily hydrolyzed. The carboxyl groups generated by the hydrolyzed ester bonds gradually increase the acid value of the system, and the acid in turn promotes hydrolysis. Anti-hydrolysis agents such as carbodiimide and polycarbodiimide can react with carboxyl groups and link broken molecular segments, greatly improving their anti-hydrolysis properties.

[0069] In order to further demonstrate the above-mentioned properties of the highly anti-swelling, waterproof and breathable medical TPU film, the applicant conducted a physical property test on it during actual application, and the test report is as follows:

[0070] Physical property test report

[0071]

[0072]

[0073]

[0074]

[0075] It can be seen from the above experimental report that the highly anti-swelling, waterproof and breathable medical TPU film prepared by the present invention has the following advantages: (1) Excellent waterproof and breathable performance, which can effectively prevent water and dirt, but at the same time has a certain degree of moisture permeability. (2) High anti-swelling performance, in complex environments, to prevent swelling and deformation during long-term use. (3) Good mechanical properties and chemical resistance, with the characteristics of resistance to oil penetration and not easy to puncture, meeting the use requirements in the medical field. (4) The preparation method is simple, easy to industrialize, and the raw materials are environmentally friendly and harmless, without volatile substances.

[0076] The above is only a preferred embodiment of a highly anti-swelling, waterproof and breathable medical TPU film and a preparation method thereof of the present invention, rather than all the embodiments. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the scope of protection of the present invention.

Claims

1. A highly anti-swelling, waterproof and breathable TPU film for medical use, characterized in that: The raw materials for its preparation include the following components in parts by weight: 30-40 parts of polyester TPU, 30-40 parts of moisture-permeable polyether TPU, 0.5-2 parts of peroxide, 0.5-2 parts of lubricant, 5-10 parts of white carbon black, and 1-5 parts of anti-hydrolysis agent; the polyester TPU resin is a polyester with a hardness range of 75-95 shore A and a number average molecular weight of 50000-200000 Dal; the moisture-permeable polyether TPU resin is a polyester with a hardness range of 75-95 shore A, and its soft segment component is polyethylene glycol with a number average molecular weight of 50000-200000 Dal.

2. A highly anti-swelling, waterproof and breathable medical TPU film according to claim 1, characterized in that: The hard segment components of the polyester TPU and the moisture-permeable polyether TPU are both diphenylmethane diisocyanate, and the chain extender is one or more combinations of butanediol, propylene glycol, and ethylene glycol.

3. The highly anti-swelling, waterproof and breathable medical TPU film according to claim 2, characterized in that: The peroxide is one or more combinations of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, 1,4-bis(tert-butylperoxyisopropylbenzene), 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, and tetra-tert-butyl-2,2-dicyclohexylpropane.

4. The highly anti-swelling, waterproof and breathable medical TPU film according to claim 3, characterized in that: The lubricant is one or more combinations of erucamide, oleamide, diethylene bisstearamide and stearamide.

5. The highly anti-swelling, waterproof and breathable medical TPU film according to claim 4, characterized in that: The white carbon black is spherical silicon dioxide with a particle size of 500nm-10μm.

6. The highly anti-swelling, waterproof and breathable medical TPU film according to claim 5, characterized in that: The anti-hydrolysis agent is one or a combination of carbodiimide and polycarbodiimide.

7. A method for preparing a highly anti-swelling, waterproof and breathable medical TPU film, characterized in that: The following steps are involved: The first step is to uniformly mix 30-40 parts of polyester TPU, 30-40 parts of moisture-permeable polyether TPU, 0.5-2 parts of peroxide, 0.5-2 parts of lubricant, 5-10 parts of white carbon black, and 1-5 parts of anti-hydrolysis agent to obtain a mixed material; Step 2: Bake the mixture in an oven at 90-110 degrees for 4-10 hours, and then use dehumidified hot air to further remove moisture; The third step is to introduce the dried mixed material into the single screw melt extruder of the film blowing machine through a pumping machine, and then enter the head and die head of the film blowing machine; The fourth step is to inflate, cool, stretch, shape and roll the melt extruded through the die head to obtain a finished film.

8. The method for preparing a highly anti-swelling, waterproof and breathable medical TPU film according to claim 7, characterized in that: In the first step, the polyester TPU and the moisture-permeable polyether TPU hard segment components are both diphenylmethane diisocyanate, the chain extender is one or more combinations of butanediol, propylene glycol, and ethylene glycol; the peroxide is one or more combinations of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, 1,4-bis(tert-butylperoxyisopropylbenzene), 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, and tetra-tert-butyl-2,2-dicyclohexylpropane; the lubricant is one or more combinations of erucamide, oleamide, diethylenebisstearamide, and stearamide; the white carbon black is spherical silica with a particle size of 500nm-10μm; the anti-hydrolysis agent is one or two combinations of carbodiimide and polycarbodiimide.

9. The method for preparing a highly anti-swelling, waterproof and breathable medical TPU film according to claim 8, characterized in that: In the first step, the temperature of the first zone is 185-195 degrees, the temperature of the second zone is 190-200 degrees, the temperature of the screen changing zone is 195-205 degrees, the temperature of the die zone is 200-210 degrees, and the temperature of the film mouth zone is 205-215 degrees.

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