Phase-change temperature-adjustable antistatic polyester film and preparation method thereof

Abstract

The invention discloses an antistatic polyester film capable of phase change temperature regulation and a preparation method thereof, the film provided by the invention has a double-layer structure, the bottom layer is a temperature regulation functional layer doped with a phase change material, and the surface layer is a functional layer doped with carbon black to prevent electrostatic aggregation. According to the antistatic polyester film capable of adjusting the temperature through phase change, the adjusting temperature is 27 DEG C, the phase change enthalpy is 17 j / g, the surface resistivity of the surface layer is 1.1 * 10 < 7 > omega / m < 2 >, and the antistatic polyester film is expected to be applied to the fields of intelligent wearable equipment, medical sensors, electronic packaging materials, supercapacitor protection layers and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyester films, and relates to an antistatic polyester film with phase change temperature regulation and a preparation method thereof. Background Art

[0002] With the development of technology, the research and application of intelligent materials have gradually become a research hotspot in various fields. In the fields of flexible electronics and intelligent wearable devices, medical sensors, electronic packaging materials, supercapacitor protective layers, etc., the demand for multifunctional temperature regulation and multifunctional thin film materials is becoming increasingly urgent.

[0003] Most of the existing temperature control materials rely on external energy sources or traditional thermal management technologies, such as air conditioners and thermal insulation materials, but these methods often have defects such as high energy consumption, slow response speed, and complex structures.

[0004] By combining phase change materials with polymer matrices and using microencapsulation technology and nano modification, temperature control films have significantly improved the heat storage and temperature regulation performance of the films. However, the phase change materials in temperature control films have poor electrical conductivity, which easily leads to electrostatic accumulation and causes equipment damage. It is difficult to achieve both temperature control and antistatic properties at the same time, and there are defects such as single function or insufficient multifunctional coordination. The future research focus lies in the development of multifunctional composite design and intelligent self-adaptive thin film materials to promote wide application. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides an antistatic polyester film with phase change temperature regulation and a preparation method thereof. The surface layer of the film of the present invention is a polyester layer doped with carbon black, and the bottom layer is a polyester layer doped with phase change materials. A double-layer polyester film is prepared by a co-extrusion method, while achieving the temperature control function and maintaining good antistatic performance. Among them, the dispersion of carbon black is particularly important. If the carbon black is in an agglomerated state, it will cause air to enter the film and result in poor antistatic performance.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides an antistatic polyester film with phase change temperature regulation. The phase change temperature regulation antistatic polyester film has a double-layer structure. The surface layer is a polyester layer doped with carbon black, and the bottom layer is a polyester layer doped with phase change materials; the carbon black accounts for 2.0%-3.0% of the mass of the surface layer.

[0008] As a preferred embodiment of the present invention, the phase change material is a phase change microcapsule prepared from octadecane and polystyrene, and the phase change material accounts for 8%-12% of the mass of the bottom layer.

[0009] As a preferred embodiment of the present invention, the thickness of the surface layer is 20-50 μm, and the thickness of the bottom layer is 10-40 μm.

[0010] The present invention also provides a method for preparing the above-mentioned antistatic ester film capable of phase change temperature regulation, and the preparation method includes the following steps:

[0011] 1) Preparation of the main extrudate: After uniformly mixing a dispersant, carbon black, and deionized water in a high-speed multifunctional crusher, drying is performed to obtain blocky carbon black; the blocky carbon black is processed with a high-speed multifunctional crusher to obtain well-dispersed granular carbon black; the granular carbon black is uniformly mixed with polyester chips to obtain the main extrudate;

[0012] 2) Preparation of the auxiliary extrudate: A stabilizing agent and an emulsifier are stirred and dissolved to obtain an emulsion system. Octadecane, styrene, and a crosslinking agent are mixed, and an initiator is added and stirred and dissolved to obtain an organic phase. The organic phase is added dropwise to the emulsion system to form an emulsion; the obtained emulsion is subjected to a polymerization reaction and crosslinked; after cooling, it is washed and dried to obtain microcapsule powder; the obtained microcapsule powder is dispersed in cyclohexane, a photo-crosslinking agent is added, and after drying, it is irradiated with ultraviolet light for a period of time, washed, and dried to obtain phase change microcapsules; the phase change microcapsules are uniformly mixed with polyester chips to obtain the auxiliary extrudate;

[0013] 3) Co-extrusion: The main extrudate of step 1) and the auxiliary extrudate of step 2) are co-extruded to obtain a thick sheet with a thickness of 390 - 1200 μm;

[0014] 4) Tensile treatment: The thick sheet obtained in step 3) is preheated, synchronously biaxially stretched, and shaped to obtain an antistatic polyester film capable of phase change temperature regulation with a surface layer thickness of 20 - 50 μm and a bottom layer thickness of 10 - 40 μm.

[0015] As a preferred embodiment of the present invention, in step 1), the mass ratio of carbon black to deionized water is 60 - 100:1000; the drying temperature is 90 - 120 °C.

[0016] As a preferred embodiment of the present invention, in step 2), the stabilizing agent is polyvinyl alcohol, the emulsifier is sodium dodecyl sulfate, the crosslinking agent is divinylbenzene, the initiator is azobisisobutyronitrile, and the photo-crosslinking agent is 4-methylphenyl diphenyl photosensitive imide.

[0017] As a preferred embodiment of the present invention, in step 2), the wavelength of the ultraviolet light is 254 nm, and the irradiation distance is 30 cm.

[0018] As a preferred embodiment of the present invention, in step 3), the screw speed of the main extruder is 60 - 90 r / min, and the temperature is 265 - 300 °C; the screw speed of the auxiliary extruder is 50 - 80 r / min, and the temperature is 260 - 270 °C; the electrostatic voltage loaded at the die of the extruder is 6 - 7 kV, and the temperature of the cold roll is 20 °C.

[0019] As a preferred embodiment of the present invention, in step 4), the preheating temperature is 80-120°C and the preheating time is 30-90 s.

[0020] As a preferred embodiment of the present invention, in step 4), the stretching temperature is 110-140°C. In synchronous biaxial stretching, the stretching ratio of the X-axis to the Y-axis is 3-4:1; the setting temperature is 100-120°C.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The surface layer of the antistatic polyester film with phase change temperature regulation provided by the present invention is a polyester layer doped with carbon black, and the bottom layer is a polyester layer doped with a phase change material. A double-layer polyester film is prepared by a coextrusion method, which can achieve the temperature control function while maintaining good antistatic performance.

[0023] 2) The temperature regulation of the antistatic polyester film with phase change temperature regulation provided by the present invention is 27°C, the phase change enthalpy is 17 J / g, and the surface resistivity of the surface layer is 1.1*10 7 Ω / m 2 。

[0024] 3) The present invention pre-disperses carbon black through a high-speed multifunctional crusher and combines it with a dispersant ECO-3786 (Wanying Auxiliaries), which can significantly reduce the agglomeration phenomenon of carbon black, thereby avoiding the deterioration of electrical properties caused by air entering the film due to carbon black agglomeration.

[0025] 4) The present invention improves the thermal stability and temperature regulation performance of the phase change microcapsules. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 is the DSC curve of Example 1 of the present invention and the pure PET film. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] The present invention provides a phase-change temperature-regulating antistatic polyester film. The phase-change temperature-regulating antistatic polyester film has a bilayer structure, with the surface layer being a polyester layer doped with carbon black and the bottom layer being a polyester layer doped with a phase-change material; the carbon black accounts for 2.0%-3.0% of the mass of the surface layer.

[0030] The present invention also provides a method for preparing the above-mentioned phase-change temperature-regulating antistatic polyester film. The preparation method includes the following steps:

[0031] 1) Preparation of the main extrudate: The dispersant, carbon black, and deionized water are mixed evenly in a high-speed multifunctional crusher and then dried to obtain massive carbon black; the massive carbon black is processed by a high-speed multifunctional crusher to obtain well-dispersed granular carbon black; the granular carbon black is mixed evenly with polyester chips to obtain the main extrudate;

[0032] 2) Preparation of the auxiliary extrudate: The stabilizer and emulsifier are stirred and dissolved to obtain an emulsion system. Octadecane, styrene, and a crosslinking agent are mixed, and an initiator is added and stirred and dissolved to obtain an organic phase. The organic phase is dropped into the emulsion system to form an emulsion; the obtained emulsion undergoes a polymerization reaction and crosslinking; after cooling, it is washed and dried to obtain microcapsule powder; the obtained microcapsule powder is dispersed in cyclohexane, a photo-crosslinking agent is added, and after drying, it is irradiated with ultraviolet light for a period of time, washed, and dried to obtain phase-change microcapsules; the phase-change microcapsules are mixed evenly with polyester chips to obtain the auxiliary extrudate;

[0033] 3) Co-extrusion: The main extrudate of step 1) and the auxiliary extrudate of step 2) are co-extruded to obtain a thick sheet with a thickness of 390-1200 μm;

[0034] 4) Tensile treatment: The thick sheet obtained in step 3) is preheated, synchronously biaxially stretched, and shaped to obtain a phase-change temperature-regulating antistatic polyester film with a surface layer thickness of 20-50 μm and a bottom layer thickness of 10-40 μm.

[0035] In the present invention, the carbon black used is Mitsubishi's 3230B conductive carbon black, and the dispersant model used is ECO-3786 of Wanying Auxiliaries.

[0036] The remaining raw materials can all be purchased from the market.

[0037] Example 1

[0038] The preparation method of the phase-change temperature-regulating antistatic polyester film provided in this example includes the following steps:

[0039] 1) Preparation of the main extruder material:

[0040] Add 1 kg of deionized water, 80 g of carbon black and 1 drop of dispersant (the size of the dropper is 5 ml) (the dispersant model is ECO-3786 of Wanying Auxiliaries, and the carbon black is 3230B conductive carbon black of Mitsubishi) into a high-speed multi-functional crusher. Operate the high-speed multi-functional crusher for 5 minutes, pour out the thick carbon black solution, put it into an oven at 100 °C for drying to obtain blocky carbon black. Then put the blocky carbon black into the high-speed multi-functional crusher and operate for 5 minutes to obtain well-dispersed granular carbon black. Mix 37.5 g of the above granular carbon black with 1462.5 g of bright polyester chips evenly, put them into a bag and shake for 2 minutes to mix evenly to obtain the main extruder material.

[0041] 2) Preparation of auxiliary extruder material:

[0042] The auxiliary extrusion material is obtained by mixing phase change microcapsules with bright polyester chips.

[0043] The preparation method of phase change microcapsules is as follows:

[0044] Add 200 g of deionized water into a 500 mL three-necked flask. Add 2 g of polyvinyl alcohol (PVA, stabilizer) and 0.5 g of sodium dodecyl sulfate (SDS emulsifier), and stir at room temperature for 30 minutes to dissolve them fully to form a uniform emulsion system.

[0045] Take 20 g of octadecane, 30 g of styrene, 1.5 g of divinylbenzene (DVB crosslinking agent), mix them evenly, and finally add 0.3 g of azobisisobutyronitrile (AIBN initiator) and stir to dissolve fully to form an organic phase for standby.

[0046] Under stirring (stirring speed: 1000 - 1200 rpm), slowly drop the organic phase into the aqueous phase, control the dropping speed to avoid uneven particle size caused by too fast addition at one time. After the dropping is completed, continue to stir at high speed for 30 minutes to form a stable emulsion.

[0047] Heat the system to 75 °C, maintain stirring (about 500 rpm), and start the polymerization reaction. Maintain the reaction temperature at 75 °C for 6 hours. Styrene polymerizes into a shell, and at the same time DVB participates in crosslinking to form a dense network. Keep slight nitrogen protection throughout the process (to avoid oxygen inhibiting polymerization). After the reaction is completed, cool it to room temperature naturally to terminate the reaction.

[0048] Wash with deionized water 3 - 5 times to remove unreacted monomers and residual stabilizers. Dry in vacuum or by freeze-drying to obtain white microcapsule powder.

[0049] Take 5g of the prepared phase change microcapsules, disperse them in 75mL of cyclohexane, add 50mg of photocrosslinker (4-methylphenyldiphenyl photosensitive imide), ultrasonic + magnetic stirring for 30 minutes, vacuum dry to obtain microcapsule powder, irradiate with 254nm ultraviolet lamp for 20 minutes, the irradiation distance is 30cm, wash the irradiated powder with ethanol to remove the unreacted photocrosslinker, and vacuum dry to obtain the final phase change microcapsules.

[0050] 150 g of the phase change microcapsules prepared by the above method were weighed and mixed with 1350 g of high gloss polyester chips to obtain auxiliary extruder material.

[0051] 3) Melt co-extrusion of main extruder and auxiliary extruder and stretching of thick slices:

[0052] The main extruder material was poured into the main extruder, the screw speed was set to 60r / min, the temperature was set to 265°C, the auxiliary extruder material was poured into the auxiliary extruder, the screw speed was set to 50r / min, the temperature was set to 260°C, the extruder die was loaded with an electrostatic voltage of 6-7kV, the cold roller temperature was 20°C, and the thickness of the obtained thick sheet was 390μm.

[0053] 4) Stretching the thick sheet, including: preheating the thick sheet at 80°C for 90 seconds, performing synchronous biaxial stretching on the preheated thick sheet at a stretching temperature of 110°C, with an X-axis to Y-axis stretching ratio of 3:1 and a setting temperature of 100°C, to obtain a 30 μm thick film, wherein the surface layer (doped carbon black layer) has a thickness of 20 μm and the bottom layer (doped phase change material layer) has a thickness of 10 μm.

[0054] Example 2

[0055] The present embodiment provides a method for preparing an antistatic polyester film capable of phase change and temperature adjustment, the method comprising the following steps:

[0056] 1) Preparation of main extruder material:

[0057] Add 1kg of deionized water, 80g of carbon black and 1 drop of dispersant (the size of the rubber-tipped dropper is 5ml) to a high-speed multifunctional crusher (the dispersant model is Wanying Auxiliary's ECO-3786, and the carbon black is Mitsubishi's 3230B conductive carbon black). Use the high-speed multifunctional crusher to work for 5 minutes, pour out the thick carbon black solution, put it in an oven at 100°C to dry, and obtain block carbon black. Put the block carbon black into the high-speed multifunctional crusher and work for 5 minutes to obtain well-dispersed granular carbon black. Mix 30g of the above granular carbon black with 1470g of high-gloss polyester chips, put it in a bag and shake it for 2 minutes to mix it evenly to obtain the main extruder material.

[0058] 2) Preparation of auxiliary extruder material:

[0059] The auxiliary extruded material is obtained by mixing the phase change microcapsules with bright polyester chips.

[0060] The preparation method of the phase change microcapsules is as follows:

[0061] Add 200 g of deionized water into a 500 mL three-necked flask. Add 2 g of polyvinyl alcohol (PVA, stabilizer) and 0.5 g of sodium dodecyl sulfate (SDS emulsifier), and stir at room temperature for 30 minutes to fully dissolve them to form a uniform emulsion system.

[0062] Take 20 g of octadecane, 30 g of styrene, and 1.5 g of divinylbenzene (DVB crosslinking agent), mix them evenly, and finally add 0.3 g of azobisisobutyronitrile (AIBN initiator), stir well to dissolve to form an organic phase for standby.

[0063] While stirring (stirring speed: 1000 - 1200 rpm), slowly drop the organic phase into the aqueous phase, control the dropping speed to avoid uneven particle size caused by too fast addition at one time. After the dropping is completed, continue to stir at high speed for 30 minutes to form a stable emulsion.

[0064] Heat the system to 75 °C, maintain stirring (about 500 rpm), and start the polymerization reaction. Maintain the reaction temperature at 75 °C for 6 hours. Styrene polymerizes into a shell, and at the same time, DVB participates in crosslinking to form a dense network. Keep slight nitrogen protection throughout the process (if conditions permit, avoid oxygen inhibiting polymerization). After the reaction is completed, naturally cool to room temperature to terminate the reaction.

[0065] Wash with deionized water 3 - 5 times to remove unreacted monomers and residual stabilizers. Dry in vacuum or by freeze-drying to obtain white microcapsule powder.

[0066] Take 5 g of the prepared phase change microcapsules, disperse them in 75 mL of cyclohexane, add 50 mg of a photo-crosslinking agent (4-methylphenyl diphenyl photosensitive imide), stir ultrasonically + magnetically for 30 minutes, dry in vacuum to obtain microcapsule powder, irradiate with a 254 nm ultraviolet lamp for 20 minutes, the irradiation distance is 30 cm, wash the irradiated powder with ethanol to remove unreacted photo-crosslinking agent, and dry in vacuum to obtain the final microcapsules.

[0067] Weigh 120 g of the phase change microcapsules prepared by the above method and mix them with 1380 g of bright polyester chips to obtain the auxiliary extruder material.

[0068] 3) Melting co-extrusion of the main extruder and the auxiliary extruder and stretching of the thick sheet:

[0069] Pour the main extruder material into the main extruder, set the screw speed to 80 r / min, and the temperature to 280 °C. Pour the auxiliary extruder material into the auxiliary extruder, set the screw speed to 60 r / min, and the temperature to 265 °C. Apply an electrostatic voltage of 6 - 7 kV to the die of the extruder, and the temperature of the cold roller is 20 °C, obtaining a thick sheet with a thickness of 500 μm.

[0070] 4) Perform stretching treatment on the thick sheet, including: preheating the thick sheet at a preheating temperature of 100 °C for 60 seconds, and performing synchronous biaxial stretching on the preheated thick sheet at a stretching temperature of 120 °C. The stretching ratio of the X-axis to the Y-axis is 4:1, and the setting temperature is 110 °C, obtaining a film with a thickness of 50 μm, where the surface layer (doped carbon black layer) has a thickness of 30 μm and the bottom layer (doped phase change material layer) has a thickness of 20 μm.

[0071] Example 3

[0072] The preparation method of the phase-change temperature-regulating antistatic polyester film provided in this example includes the following steps:

[0073] 1) Preparation of the main extruder material:

[0074] Add 1 kg of deionized water, 80 g of carbon black, and 1 drop of dispersant (the size of the dropper is 5 ml) (the dispersant model is ECO-3786 of Wanying Auxiliaries, and the carbon black is 3230B conductive carbon black of Mitsubishi) into a high-speed multi-functional crusher. Operate the high-speed multi-functional crusher for 5 minutes, pour out the thick carbon black solution, place it in an oven at 100 °C for drying to obtain blocky carbon black. Then put the blocky carbon black into the high-speed multi-functional crusher and operate for 5 minutes to obtain well-dispersed granular carbon black. Mix 45 g of the above granular carbon black with 1455 g of bright polyester chips evenly, and put them into a bag and shake for 2 minutes to mix evenly to obtain the main extruder material.

[0075] 2) Preparation of the auxiliary extruder material:

[0076] The auxiliary extruder material is obtained by mixing phase change microcapsules with bright polyester chips.

[0077] The preparation method of the phase change microcapsules is as follows:

[0078] Add 200 g of deionized water into a 500 mL three-necked flask. Add 2 g of polyvinyl alcohol (PVA, stabilizer) and 0.5 g of sodium dodecyl sulfate (SDS emulsifier), and stir at room temperature for 30 minutes to fully dissolve it to form a uniform emulsion system.

[0079] Take 20 g of octadecane, 30 g of styrene, and 1.5 g of divinylbenzene (DVB cross-linking agent), mix them evenly, and finally add 0.3 g of azobisisobutyronitrile (AIBN initiator) and stir to fully dissolve to form an organic phase for standby.

[0080] While stirring (stirring speed: 1000 - 1200 rpm), slowly add the organic phase to the aqueous phase, controlling the dropping rate to avoid uneven particle size caused by too fast addition at one time. After the addition is completed, continue high-speed stirring for 30 minutes to form a stable emulsion.

[0081] Heat the system to 75 °C, maintain stirring (about 500 rpm), and start the polymerization reaction. Maintain the reaction temperature at 75 °C for 6 hours. Styrene polymerizes into the shell, and at the same time DVB participates in cross-linking to form a dense network. Keep slight nitrogen protection throughout the process (to avoid oxygen inhibiting polymerization). After the reaction is completed, cool naturally to room temperature to terminate the reaction.

[0082] Wash with deionized water 3 - 5 times to remove unreacted monomers and residual stabilizers. Dry under vacuum or by freeze-drying to obtain white microcapsule powder.

[0083] Take 5 g of the prepared phase change microcapsules, disperse them in 75 mL of cyclohexane, then add 50 mg of a photo-crosslinking agent (4-methylphenyl diphenyl photosensitive imide), ultrasonically + magnetically stir for 30 minutes, dry under vacuum to obtain microcapsule powder, irradiate with a 254 nm ultraviolet lamp for 20 minutes at an irradiation distance of 30 cm, wash the irradiated powder with ethanol to remove unreacted photo-crosslinking agent, and dry under vacuum to obtain the final microcapsules.

[0084] Weigh 180 g of the phase change microcapsules prepared by the above method and mix them with 1320 g of bright polyester chips to obtain the auxiliary extruder material.

[0085] 3) Melting co-extrusion of the main extruder and the auxiliary extruder and stretching of the thick sheet:

[0086] Pour the main extruder material into the main extruder, set the screw speed to 70 r / min and the temperature to 300 °C, pour the auxiliary extruder material into the auxiliary extruder, set the screw speed to 80 r / min and the temperature to 270 °C, load an electrostatic voltage of 6 - 7 kV at the die of the extruder, and the temperature of the cold roll is 20 °C to obtain a thick sheet with a thickness of 1200 μm.

[0087] 4) Carry out stretching treatment on the thick sheet, including: preheating the thick sheet at a preheating temperature of 120 °C for 30 seconds, and performing synchronous biaxial stretching on the preheated thick sheet at a stretching temperature of 140 °C with a stretching ratio of 3:1 for the X-axis and Y-axis, and a setting temperature of 120 °C to obtain a film with a thickness of 90 μm, where the surface layer (carbon black doped layer) has a thickness of 50 μm and the bottom layer (phase change material doped layer) has a thickness of 40 μm.

[0088] Comparative Example 1, pure PET film.

[0089] The DSC curves of the polyester film prepared in Example 1 and the pure PET film in Comparative Example 1 are asFigure 1 as shown

[0090] Using a DSC testing instrument (DSC, Q2000), it was carried out in a nitrogen atmosphere. The sample was heated from 0 °C to 50 °C at a rate of 10 K / min and then cooled from 50 °C to 0 °C at the same rate.

[0091] The polyester film prepared in Example 1 and the pure PET film in Comparative Example 1 were tested. The surface resistivity of the polyester film in Example 1 and the pure PET film in Comparative Example 1 was tested, and the results are shown in Table 1. (Tested according to the standard of ASTM D257)

[0092] Table 1. Test results

[0093] Sample number <![CDATA[Surface resistivity (Ω / m 2 )]]> Comparative example 1 <![CDATA[2.45*10 15 > Example 1 <![CDATA[1.1*10 7 >

[0094] Thus, it can be seen that the surface layer of the antistatic polyester film with phase change temperature regulation provided by the present invention is polyester doped with carbon black, and the bottom layer is a polyester layer doped with a phase change material. A double-layer polyester film is prepared by a co-extrusion method, which can maintain good antistatic performance while realizing the temperature control function. The regulated temperature is 27 °C, the phase change enthalpy is 17 J / g, and the surface resistivity is 1.1×10 7 Ω / m 2 .

[0095] The above is only the preferred embodiment of the present invention, and it does not limit the present invention in any form or substance. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the method of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. For those who are familiar with this professional technology, without departing from the spirit and scope of the present invention, any equivalent changes made by using the technical content disclosed above, such as slight modifications, decorations, and evolutions, are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An antistatic polyester film with phase change temperature regulation, characterized in that, The phase-change temperature-regulating antistatic polyester film is a double-layer structure, the surface layer is a polyester layer doped with carbon black, and the bottom layer is a polyester layer doped with phase-change material; the carbon black accounts for 2.0%-3.0% of the surface layer mass.

2. The antistatic polyester film capable of phase change temperature regulation according to claim 1, wherein The phase change material is a phase change microcapsule made of octadecane and polystyrene, and the phase change material accounts for 8%-12% of the mass of the bottom layer.

3. The antistatic polyester film capable of phase change temperature regulation according to claim 1, characterized in that, The thickness of the surface layer is 20-50 μm, and the thickness of the bottom layer is 10-40 μm.

4. A preparation method of an antistatic polyester film capable of phase change temperature regulation, characterized in that, The preparation method comprises the following steps: 1) Preparation of the main extrusion material: after the dispersant, carbon black and deionized water are uniformly mixed in a high-speed multifunctional crusher, drying is performed to obtain a block carbon black; the block carbon black is crushed by a high-speed multifunctional crusher to obtain dispersed granular carbon black; the granular carbon black is uniformly mixed with polyester chips to obtain the main extrusion material; 2) Preparation of auxiliary extrusion material: After the stabilizer and the emulsifier are stirred and dissolved, an emulsified system is obtained; octadecane, styrene and a crosslinking agent are mixed; an initiator is added and stirred and dissolved to obtain an organic phase; the organic phase is added dropwise to the emulsified system to form an emulsion; the obtained emulsion is subjected to polymerization reaction and crosslinking; after cooling, the emulsion is washed and dried to obtain microcapsule powder; the obtained microcapsule powder is dispersed in cyclohexane, a photocrosslinking agent is added, and after drying, ultraviolet light is irradiated for a period of time, washed, and dried to obtain phase change microcapsules; the phase change microcapsules are uniformly mixed with polyester chips to obtain auxiliary extrusion material; 3) Co-extrusion: The main extrudate of step 1) and the auxiliary extrudate of step 2) are co-extruded to obtain a thick sheet with a thickness of 390-1200 μm; 4) Stretching treatment: preheat the thick sheet obtained in step 3), perform synchronous biaxial stretching, and shape fixation to obtain a phase-change temperature-adjustable antistatic polyester film with a surface layer thickness of 20-50 μm and a bottom layer thickness of 10-40 μm.

5. The preparation method of an antistatic polyester film capable of phase change temperature regulation according to claim 4, characterized in that, In the step 1), the mass ratio of carbon black to deionized water is 60-100:1000; and the drying temperature is 90-120°C.

6. The preparation method of an antistatic polyester film with phase change temperature regulation according to claim 4, characterized in that, In the step 2), the stabilizer is polyvinyl alcohol, the emulsifier is sodium dodecyl sulfate, the crosslinking agent is divinylbenzene, the initiator is azobisisobutyronitrile, and the photocrosslinking agent is 4-methylphenyl diphenyl photosensitive imide.

7. The preparation method of an antistatic polyester film with phase change temperature regulation according to claim 4, characterized in that In the step 2), the wavelength of the ultraviolet light is 254 nm and the irradiation distance is 30 cm.

8. The preparation method of an antistatic polyester film with phase change temperature regulation according to claim 4, characterized in that In the step 3), the screw speed of the main extruder is 60-90r / min, and the temperature is 265-300°C; the screw speed of the auxiliary extruder is 50-80r / min, and the temperature is 260-270°C; the electrostatic voltage loaded on the extruder die is 6-7kV, and the temperature of the cold roller is 20°C.

9. The preparation method of an antistatic polyester film with phase change temperature regulation according to claim 4, characterized in that, In the step 4), the preheating temperature is 80-120° C. and the preheating time is 30-90 seconds.

10. The preparation method of an antistatic polyester film with phase-change temperature regulation according to claim 4, characterized in that, In the step 4), the stretching temperature is 110-140°C, and in the synchronous biaxial stretching, the X-axis to Y-axis stretching ratio is 3-4:1; the setting temperature is 100-120°C.

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