A low-humidity-resistance transparent TPEE film and its preparation method

Abstract

The raw materials for preparing this low-moisture-resistance transparent TPEE film include the following components: 85-95 parts of thermoplastic polyester elastomer, 1-10 parts of inorganic opening agent, 0.1-2 parts of organic slip agent, 0.1-2 parts of nucleating agent, and 0.1-1 parts of antioxidant. The preparation method involves first mixing the above components evenly using a mixer; then transferring the mixture into a barrel and baking the barrel with hot air at 85-125 degrees Celsius for 3-12 hours; next, feeding the baked mixture into a single-screw melt extruder of a blown film machine or casting machine using a feeder; finally, extending and shaping the molten mixture into a TPEE film using the cooling and shaping system of the blown film machine or casting machine, and then traction, stretching, and winding the TPEE film using a slitting system to obtain the low-moisture-resistance transparent TPEE film. This low-moisture-resistance transparent TPEE film exhibits excellent moisture permeability, water pressure resistance, and can be laminated with polyester fabrics, allowing for secondary recycling.

Description

Technical Field

[0001] This invention relates to the field of new material thin films, specifically to a low-humidity-resistance transparent TPEE thin film and its preparation method. Background Technology

[0002] Waterproof and breathable materials are those that allow water vapor to pass through while resisting the penetration of external liquid water. Combining waterproof and breathable membrane materials with clothing materials can create multifunctional protective garments with good thermal comfort. This material was first developed by Gore, whose representative product is Gore-Tex polytetrafluoroethylene (PTFE) waterproof and breathable membrane. Its main principle is porous breathability, meaning the pores are positioned between the diameter of a water droplet and the diameter of a water vapor molecule. Later, non-porous breathable membranes were developed, which absorb water vapor through hydrophilic segments or side groups on the membrane's molecular chains and transfer it to the outside via solution diffusion. In the industry, the RET (wet resistance) value is commonly used to measure the breathability of the fabric. The lower the RET value, the faster the water vapor transfer rate.

[0003] As people's demands for clothing increase, they are beginning to focus on environmentally friendly and recyclable concepts. PTFE membranes, due to their fluorine content, will produce highly toxic gases when incinerated. Meanwhile, breathable membranes made of TPU, when laminated with polyester fabrics, face recycling challenges. After hydrolysis, this fabric forms a mixed salt of terephthalic acid and diphenylmethane diisocyanate, significantly increasing the difficulty of PTA purification. Therefore, there is an urgent need to solve the recycling problem of waterproof and breathable fabrics. Furthermore, people demand even higher breathability to wick away sweat quickly and keep clothing drier.

[0004] In view of this, the inventor conducted in-depth research on the aforementioned deficiencies in the prior art, which led to the creation of this case. Summary of the Invention

[0005] To address the aforementioned technical issues, we propose a low-moisture-resistance transparent TPEE film and its preparation method. The prepared low-moisture-resistance transparent TPEE film exhibits excellent moisture permeability, water pressure resistance, and high physical properties. Furthermore, it can be laminated with polyester fabrics and can be recycled.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A low-moisture-resistance transparent TPEE film is prepared by means of the following components by weight: 85-95 parts of thermoplastic polyester elastomer, 1-10 parts of inorganic opening agent, 0.1-2 parts of organic slip agent, 0.1-2 parts of nucleating agent, and 0.1-1 parts of antioxidant; wherein the thermoplastic polyester elastomer is a moisture-permeable TPEE with a Shore hardness between 20D and 50D; and the thickness of the prepared low-moisture-resistance transparent TPEE film is 0.005-0.1 mm.

[0008] Preferably, the moisture-permeable TPEE is formed by the reaction of terephthalic acid, chain extender and diol oligomer.

[0009] Preferably, the chain extender is one or a combination of ethylene glycol, propylene glycol, butanediol, and hexanediol.

[0010] Preferably, the diol oligomer is one or more of dihydroxy polyethylene glycol (PEG) or dihydroxy polypropylene glycol (PPG), with a molecular weight of 300-4000 Da.

[0011] Preferably, the inorganic opening agent is one or more combinations of barium sulfate, diatomaceous earth, calcium carbonate, montmorillonite, talc, mica powder, and silica, with a particle size distribution of D97 in the range of 30nm-50μm.

[0012] Preferably, the organic slip agent is one or more combinations of stearamide, oleamide, ethylene bis-stearamide, ethylene bis-oleamide, and erucamide.

[0013] Preferably, the nucleating agent is a compound nucleating agent, which is a compound of an organic nucleating agent and a crystallization promoter in a certain proportion; the compounding ratio of the organic nucleating agent and the crystallization promoter is 2-5:1.

[0014] Preferably, the nucleating agent is one or more of potassium N-butylpyridine, di-p-methylbenzyl sorbitol, and xylene dialkyl urea; the crystallization promoter is one or more of polyethylene glycol, polypropylene glycol, tribenzyl propylene diester hexanol, and neopentyl ethylene glycol biphenyl ester.

[0015] Preferably, the antioxidant is one or a combination of tris[2,4-di-tert-butylphenyl]phosphite, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester or tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester.

[0016] A method for preparing a low-humidity-resistance transparent TPEE film includes the following steps:

[0017] Step 1. Mix 85-95 parts of moisture-permeable thermoplastic polyester elastomer, 1-10 parts of inorganic opening agent, 0.1-2 parts of organic slip agent, 0.1-2 parts of nucleating agent, and 0.1-1 parts of antioxidant evenly using a mixer;

[0018] Step 2. Transfer the above mixture into the barrel and bake the barrel containing the mixture with dehumidified hot air at 85-125 degrees Celsius for 3-12 hours.

[0019] Step 3. Feed the baked mixture into the single-screw melt extruder of the blown film machine or casting machine using a feeder. The process temperature is set as follows: Zone 1: 185-205 degrees Celsius; Zone 2: 190-225 degrees Celsius; Zone 3: 190-225 degrees Celsius; Zone 4: 195-230 degrees Celsius; Zone 5: 195-230 degrees Celsius; Screen changing zone: 205-235 degrees Celsius; Die head zone: 205-235 degrees Celsius.

[0020] Step 4. The molten mixture is extended and shaped into a TPEE film using the cooling and shaping system of a blown film machine or a casting machine. The TPEE film is then pulled, stretched, and wound up using a slitting system to finally obtain this low-moisture-resistance transparent TPEE film.

[0021] Through the above technical solution, the molecular chain segments of moisture-permeable TPEE are composed of benzene rings, ester bonds, and carbon-ether bonds. The benzene rings have a rigid symmetrical structure and are linked to highly polar ester groups, forming a conjugated structure, which is the main crystalline region of TPEE. The carbon-ether bonds are polar groups with strong hydrophilic properties, ensuring the effective adsorption of water molecules in high-humidity environments. Water molecules then freely transport within the material through an adsorption-diffusion-desorption cycle, achieving the moisture permeability effect. This TPEE membrane exhibits excellent moisture permeability, high physical properties, and can be bonded to polyester fabrics, enabling secondary recycling. This method improves the moisture permeability and water pressure resistance of TPEE membranes, thus achieving a novel design, a reasonable process formulation, and good application results. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0024] Example 1.

[0025] A low-moisture-resistance transparent TPEE film is prepared by means of the following components by weight: 95 parts thermoplastic polyester elastomer, 10 parts inorganic opening agent, 2 parts organic slip agent, 2 parts nucleating agent, and 1 part antioxidant. The thermoplastic polyester elastomer is a moisture-permeable TPEE with a Shore hardness between 20D and 50D. The thickness of the prepared low-moisture-resistance transparent TPEE film is 0.005-0.1 mm. The moisture-permeable TPEE is formed by the reaction of terephthalic acid, a chain extender, and a diol oligomer. The chain extender is ethylene glycol. The diol oligomer is dihydroxy polyethylene glycol (PEG) with a molecular weight of 300-4000 Da. The inorganic opening agent is barium sulfate with a particle size distribution of D97 (30nm-50μm). The organic slip agent is stearamide. The nucleating agent is a compound nucleating agent, which is a mixture of an organic nucleating agent and a crystallization accelerator in a certain proportion, and the ratio of the organic nucleating agent to the crystallization accelerator is 2:1. The organic nucleating agent is potassium N-butylpyridine; the crystallization accelerator is polyethylene glycol. The antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0026] The preparation method of the low-humidity-resistance transparent TPEE film in this example includes the following steps:

[0027] Step 1. Mix 95 parts of moisture-permeable thermoplastic polyester elastomer, 10 parts of inorganic opening agent, 2 parts of organic slip agent, 2 parts of nucleating agent, and 1 part of antioxidant evenly using a mixer;

[0028] Step 2. Transfer the above mixture into the barrel and bake the barrel containing the mixture with dehumidified hot air at 125 degrees Celsius for 3 hours.

[0029] Step 3. Feed the baked mixture into the single-screw melt extruder of the blown film machine or casting machine using a feeder. The process temperature is set as follows: Zone 1: 185-205 degrees Celsius; Zone 2: 190-225 degrees Celsius; Zone 3: 190-225 degrees Celsius; Zone 4: 195-230 degrees Celsius; Zone 5: 195-230 degrees Celsius; Screen changing zone: 205-235 degrees Celsius; Die head zone: 205-235 degrees Celsius.

[0030] Step 4. The molten mixture is extended and shaped into a TPEE film using the cooling and shaping system of a blown film machine or a casting machine. The TPEE film is then pulled, stretched, and wound up using a slitting system to finally obtain this low-moisture-resistance transparent TPEE film.

[0031] Example 2.

[0032] A low-moisture-resistance transparent TPEE film is prepared by means of the following components by weight: 90 parts thermoplastic polyester elastomer, 8 parts inorganic opening agent, 1.5 parts organic slip agent, 1 part nucleating agent, and 0.8 parts antioxidant. The thermoplastic polyester elastomer is a moisture-permeable TPEE with a Shore hardness between 20D and 50D. The thickness of the prepared low-moisture-resistance transparent TPEE film is 0.005-0.8 mm. The moisture-permeable TPEE is formed by the reaction of terephthalic acid, a chain extender, and a diol oligomer. The chain extender is propylene glycol. The diol oligomer is dihydroxy polypropylene glycol (PPG) with a molecular weight of 300-4000 Da. The inorganic opening agent is diatomaceous earth with a particle size distribution of D97 (30 nm-50 μm). The organic slip agent is oleamide. The nucleating agent is a compound nucleating agent, which is a mixture of an organic nucleating agent and a crystallization accelerator in a certain proportion; the ratio of the organic nucleating agent to the crystallization accelerator is 3:1. The nucleating agent is di-p-methylbenzyl sorbitol; the crystallization accelerator is polypropylene glycol. The antioxidant is β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester.

[0033] The preparation method of the low-humidity-resistance transparent TPEE film in this example includes the following steps:

[0034] Step 1. Mix 90 parts of moisture-permeable thermoplastic polyester elastomer, 8 parts of inorganic opening agent, 1.5 parts of organic slip agent, 1 part of nucleating agent, and 0.8 parts of antioxidant evenly using a mixer;

[0035] Step 2. Transfer the above mixture into the drum and bake the drum containing the mixture with 120°C dehumidified hot air for 3.5 hours.

[0036] Step 3. Feed the baked mixture into the single-screw melt extruder of the blown film machine or casting machine using a feeder. The process temperature is set as follows: Zone 1: 185-205 degrees Celsius; Zone 2: 190-225 degrees Celsius; Zone 3: 190-225 degrees Celsius; Zone 4: 195-230 degrees Celsius; Zone 5: 195-230 degrees Celsius; Screen changing zone: 205-235 degrees Celsius; Die head zone: 205-235 degrees Celsius.

[0037] Step 4. The molten mixture is extended and shaped into a TPEE film using the cooling and shaping system of a blown film machine or a casting machine. The TPEE film is then pulled, stretched, and wound up using a slitting system to finally obtain this low-moisture-resistance transparent TPEE film.

[0038] Example 3.

[0039] A low-moisture-resistance transparent TPEE film is prepared by means of the following components by weight: 85 parts thermoplastic polyester elastomer, 5 parts inorganic opening agent, 1 part organic slip agent, 0.8 parts nucleating agent, and 0.6 parts antioxidant. The thermoplastic polyester elastomer is a moisture-permeable TPEE with a Shore hardness between 20D and 50D. The thickness of the prepared low-moisture-resistance transparent TPEE film is 0.005-0.1 mm. The moisture-permeable TPEE is formed by the reaction of terephthalic acid, a chain extender, and a diol oligomer. The chain extender is butanediol. The diol oligomer is a combination of dihydroxy polyethylene glycol (PEG) and dihydroxy polypropylene glycol (PPG) with a molecular weight of 300-4000 Da. The inorganic opening agent is calcium carbonate with a particle size distribution of D97 (30nm-50μm). The organic slip agent is ethylene bis-stearamide. The nucleating agent is a compound nucleating agent, which is a mixture of an organic nucleating agent and a crystallization accelerator in a certain proportion; the ratio of the organic nucleating agent to the crystallization accelerator is 4:1. The nucleating agent is xylene dialkyl urea; the crystallization accelerator is tribenzyl propylene diester hexanol. The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0040] The preparation method of the low-humidity-resistance transparent TPEE film in this example includes the following steps:

[0041] Step 1. Mix 85 parts of moisture-permeable thermoplastic polyester elastomer, 5 parts of inorganic opening agent, 1 part of organic slip agent, 0.8 parts of nucleating agent, and 0.6 parts of antioxidant evenly using a mixer;

[0042] Step 2. Transfer the above mixture into the barrel and bake the barrel containing the mixture with 110-degree dehumidified hot air for 4 hours.

[0043] Step 3. Feed the baked mixture into the single-screw melt extruder of the blown film machine or casting machine using a feeder. The process temperature is set as follows: Zone 1: 185-205 degrees Celsius; Zone 2: 190-225 degrees Celsius; Zone 3: 190-225 degrees Celsius; Zone 4: 195-230 degrees Celsius; Zone 5: 195-230 degrees Celsius; Screen changing zone: 205-235 degrees Celsius; Die head zone: 205-235 degrees Celsius.

[0044] Step 4. The molten mixture is extended and shaped into a TPEE film using the cooling and shaping system of a blown film machine or a casting machine. The TPEE film is then pulled, stretched, and wound up using a slitting system to finally obtain this low-moisture-resistance transparent TPEE film.

[0045] Example 4.

[0046] A low-moisture-resistance transparent TPEE film is prepared by means of the following components by weight: 90 parts of thermoplastic polyester elastomer, 3 parts of inorganic opening agent, 0.5 parts of organic slip agent, 0.5 parts of nucleating agent, and 0.5 parts of antioxidant. The thermoplastic polyester elastomer is a moisture-permeable TPEE with a Shore hardness between 20D and 50D. The thickness of the prepared low-moisture-resistance transparent TPEE film is 0.005-0.1 mm. The moisture-permeable TPEE is formed by reacting terephthalic acid, a chain extender, and a diol oligomer. The chain extender is hexanediol. The diol oligomer is dihydroxy polyethylene glycol (PEG) with a molecular weight of 300-4000 Da. The inorganic opening agent is montmorillonite with a particle size distribution of D97 (30nm-50μm). The organic slip agent is ethylene bisoleic acid amide. The nucleating agent is a compound nucleating agent, which is a mixture of an organic nucleating agent and a crystallization promoter in a certain proportion; the ratio of the organic nucleating agent to the crystallization promoter is 5:1. The nucleating agent is a combination of potassium N-butylpyridine and di-p-methylbenzyl sorbitol; the crystallization promoter is neopentyl ethylene glycol biphenyl ester. The antioxidant is a combination of tris[2,4-di-tert-butylphenyl]phosphite and β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester.

[0047] A method for preparing a low-humidity-resistance transparent TPEE film includes the following steps:

[0048] Step 1. Mix 90 parts of moisture-permeable thermoplastic polyester elastomer, 3 parts of inorganic opening agent, 0.5 parts of organic slip agent, 0.5 parts of nucleating agent, and 0.5 parts of antioxidant evenly using a mixer;

[0049] Step 2. Transfer the above mixture into the barrel and bake the barrel containing the mixture with 100-degree dehumidified hot air for 5 hours.

[0050] Step 3. Feed the baked mixture into the single-screw melt extruder of the blown film machine or casting machine using a feeder. The process temperature is set as follows: Zone 1: 185-205 degrees Celsius; Zone 2: 190-225 degrees Celsius; Zone 3: 190-225 degrees Celsius; Zone 4: 195-230 degrees Celsius; Zone 5: 195-230 degrees Celsius; Screen changing zone: 205-235 degrees Celsius; Die head zone: 205-235 degrees Celsius.

[0051] Step 4. The molten mixture is extended and shaped into a TPEE film using the cooling and shaping system of a blown film machine or a casting machine. The TPEE film is then pulled, stretched, and wound up using a slitting system to finally obtain this low-moisture-resistance transparent TPEE film.

[0052] Example 5. 90 parts of a breathable thermoplastic polyester elastomer, 3 parts of an inorganic opening agent, 0.5 parts of an organic slip agent, 0.5 parts of a nucleating agent, and 0.5 parts of an antioxidant were mixed.

[0053] The low-moisture-resistance transparent TPEE film in this example is prepared from the following raw materials by weight: 85 parts thermoplastic polyester elastomer, 2 parts inorganic opening agent, 0.3 parts organic slip agent, 0.3 parts nucleating agent, and 0.3 parts antioxidant. The thermoplastic polyester elastomer is a moisture-permeable TPEE with a Shore hardness between 20D and 50D. The thickness of the prepared low-moisture-resistance transparent TPEE film is 0.005-0.1 mm. The moisture-permeable TPEE is formed by the reaction of terephthalic acid, a chain extender, and a diol oligomer. The chain extender is a combination of ethylene glycol and propylene glycol. The diol oligomer is dihydroxy polypropylene glycol (PPG) with a molecular weight of 300-4000 Da. The inorganic opening agent is talc with a particle size distribution of D97 (30nm-50μm). The organic slip agent is erucamide. The nucleating agent is a compound nucleating agent, which is a mixture of an organic nucleating agent and a crystallization accelerator in a certain proportion; the ratio of the organic nucleating agent to the crystallization accelerator is 3:1. The nucleating agent is a combination of di-p-methylbenzyl sorbitol and xylene-2-dialkylurea; the crystallization accelerator is a combination of polyethylene glycol and polypropylene glycol. The antioxidant is a combination of octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0054] The preparation method of the low-humidity-resistance transparent TPEE film in this example includes the following steps:

[0055] Step 1. Mix 85 parts of thermoplastic polyester elastomer, 2 parts of inorganic opening agent, 0.3 parts of organic slip agent, 0.3 parts of nucleating agent, and 0.3 parts of antioxidant evenly using a mixer;

[0056] Step 2. Transfer the above mixture into the barrel and bake the barrel containing the mixture with 90-degree dehumidified hot air for 7 hours.

[0057] Step 3. Feed the baked mixture into the single-screw melt extruder of the blown film machine or casting machine using a feeder. The process temperature is set as follows: Zone 1: 185-205 degrees Celsius; Zone 2: 190-225 degrees Celsius; Zone 3: 190-225 degrees Celsius; Zone 4: 195-230 degrees Celsius; Zone 5: 195-230 degrees Celsius; Screen changing zone: 205-235 degrees Celsius; Die head zone: 205-235 degrees Celsius.

[0058] Step 4. The molten mixture is extended and shaped into a TPEE film using the cooling and shaping system of a blown film machine or a casting machine. The TPEE film is then pulled, stretched, and wound up using a slitting system to finally obtain this low-moisture-resistance transparent TPEE film.

[0059] In addition, in the above embodiments, the chain extender may be one or more combinations of ethylene glycol, propylene glycol, butanediol, and hexanediol; the diol oligomer may be one or a combination of dihydroxy polyethylene glycol (PEG) or dihydroxy polypropylene glycol (PPG), with a molecular weight of 300-4000 Da; the inorganic opening agent may be one or more combinations of barium sulfate, diatomaceous earth, calcium carbonate, montmorillonite, talc, mica powder, and silica, with a particle size of 30 nm-50 μm at D97; and the organic slip agent may be stearamide, oleamide, ethylene bis-stearamide, or ethylene bisoleic acid. The nucleating agent may be one or more of the following: amide, erucamide; the nucleating agent may be one or more of the following: potassium N-butylpyridine, di-p-methylbenzyl sorbitol, xylene dialkyl urea; the crystallization promoter may be one or more of the following: polyethylene glycol, polypropylene glycol, tribenzyl propylene diester hexanol, neopentyl ethylene glycol biphenyl ester; the antioxidant may be one or more of the following: tris[2,4-di-tert-butylphenyl]phosphite, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. No particular limitations will be imposed here, and all of the above are within the scope of protection of this invention.

[0060] The technical approaches of the above embodiments are as follows:

[0061] The molecular chain of moisture-permeable TPEE consists of benzene rings, ester bonds, and carbon-ether bonds. The benzene rings have a rigid, symmetrical structure and are linked to highly polar ester groups, forming a conjugated structure, which is the main crystalline region of TPEE. The carbon-ether bonds are polar groups with strong hydrophilic properties, ensuring effective adsorption of water molecules in high-humidity environments. Water molecules then freely transport within the material through an adsorption-diffusion-desorption cycle, thus achieving the moisture-permeable effect.

[0062] In actual production, an excessively high proportion of flexible carbon-ether bonds will inhibit the crystallization rate of TPEE, resulting in a longer production cycle. TPEE films are often prone to warping, poor surface properties, and brittleness. Organic nucleating agents crystallize faster and at higher temperatures than TPEE. After TPEE melts and cools, they preferentially form numerous organic nucleation sites within the system. Simultaneously, crystallization promoters are low-melting-point small molecules or oligomers with even lower cold crystallization temperatures, thus lowering the overall crystallization temperature of the system. Compared to the absence of crystallization promoters, the former achieves a higher crystallization rate at the same cooling temperature, thereby accelerating molecular chain folding.

[0063] Under the action of the compound nucleating agent, the crystallization rate is accelerated, and numerous small and regular crystalline structures are induced in TPEE products. Higher crystallinity will better achieve phase separation of carbon-ether bonds and rigid segments of benzene rings. The molecular concentration of carbon-ether bonds improves the permeability of water molecules, increases their transport rate, and enhances moisture permeability.

[0064] To further verify the performance of the TPU film of this invention as a replacement for a light-shielding coating, its physical properties were tested, and the report is as follows:

[0065]

[0066] Therefore, the low moisture resistance transparent TPEE film provided by this invention has the following advantages and effects compared with traditional waterproof and breathable fabrics that use a light-blocking coating to make high-light-blocking fabrics:

[0067] 1. This TPEE film, through the compounded nucleating agent, exhibits higher moisture permeability and excellent physical properties. Testing shows its moisture resistance reaches 1 m²*Pa / W (ISO 11092:2014).

[0068] 2. The preparation method of this TPEE film is relatively simple and can be continuously produced, ensuring production efficiency.

[0069] 3. This TPEE film uses environmentally friendly raw materials and additives, and can achieve PTA recycling after being laminated with polyester fabric.

[0070] The above description is merely a preferred embodiment of a low-humidity-resistance transparent TPEE film and its preparation method according to the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A low-moisture-resistance transparent TPEE film, characterized in that, The raw materials for its preparation include the following components by weight: 85-95 parts of thermoplastic polyester elastomer, 1-10 parts of inorganic opening agent, 0.1-2 parts of organic slip agent, 0.1-2 parts of nucleating agent, and 0.1-1 parts of antioxidant; the thermoplastic polyester elastomer is a moisture-permeable TPEE with a Shore hardness between 20D and 50D; the thickness of the low moisture resistance transparent TPEE film prepared by it is 0.005-0.1 mm.

2. The low-humidity-resistance transparent TPEE film according to claim 1, characterized in that, The moisture-permeable TPEE is formed by the reaction of terephthalic acid, chain extender and diol oligomer.

3. The low-humidity-resistance transparent TPEE film according to claim 2, characterized in that, The chain extender is one or more combinations of ethylene glycol, propylene glycol, butanediol, and hexanediol.

4. The low-humidity-resistance transparent TPEE film according to claim 3, characterized in that, The diol oligomer is one or more combinations of dihydroxy polyethylene glycol (PEG) or dihydroxy polypropylene glycol (PPG), with a molecular weight of 300-4000 Da.

5. A low-humidity-resistance transparent TPEE film according to claim 4, characterized in that, The inorganic opening agent is one or more of barium sulfate, diatomaceous earth, calcium carbonate, montmorillonite, talc, mica powder, and silica, with a particle size distribution of D97 in the range of 30nm-50μm.

6. The low-humidity-resistance transparent TPEE film according to claim 5, characterized in that, The organic slip agent is one or more of stearamide, oleamide, ethylene bis-stearamide, ethylene bis-oleamide, and erucamide.

7. A low-humidity-resistance transparent TPEE film according to claim 6, characterized in that, The nucleating agent is a compound nucleating agent, which is a compound of an organic nucleating agent and a crystallization promoter in a certain proportion; the compounding ratio of the organic nucleating agent and the crystallization promoter is 2-5:

1.

8. A low-humidity-resistance transparent TPEE film according to claim 7, characterized in that, The nucleating agent is one or more of the following: potassium N-butylpyridine, di-p-methylbenzyl sorbitol, and xylene dialkyl urea; the crystallization promoter is one or more of the following: polyethylene glycol, polypropylene glycol, tribenzyl propylene diester hexanol, and neopentyl ethylene glycol biphenyl ester.

9. A low-humidity-resistance transparent TPEE film according to claim 8, characterized in that, The antioxidant is one or more combinations of tris[2,4-di-tert-butylphenyl]phosphite, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester or tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester.

10. A method for preparing a low-moisture-resistance transparent TPEE film, characterized in that, Includes the following steps: Step 1. Mix 85-95 parts of moisture-permeable thermoplastic polyester elastomer, 1-10 parts of inorganic opening agent, 0.1-2 parts of organic slip agent, 0.1-2 parts of nucleating agent, and 0.1-1 parts of antioxidant evenly using a mixer; Step 2. Transfer the above mixture into the barrel and bake the barrel containing the mixture with dehumidified hot air at 85-125 degrees Celsius for 3-12 hours. Step 3. Feed the baked mixture into the single-screw melt extruder of the blown film machine or casting machine using a feeder. The process temperature is set as follows: Zone 1: 185-205 degrees Celsius; Zone 2: 190-225 degrees Celsius; Zone 3: 190-225 degrees Celsius; Zone 4: 195-230 degrees Celsius; Zone 5: 195-230 degrees Celsius; Screen changing zone: 205-235 degrees Celsius; Die head zone: 205-235 degrees Celsius. Step 4. The molten mixture is extended and shaped into a TPEE film using the cooling and shaping system of a blown film machine or a casting machine. The TPEE film is then pulled, stretched, and wound up using a slitting system to obtain this low moisture resistance transparent TPEE film.

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