Anti-adhesion optical polyester film and preparation method thereof

Abstract

The invention relates to an optical polyester film capable of preventing winding adhesion, which comprises a PET (Polyethylene Terephthalate) polyester base film and pre-coating layers coated on two surfaces of the PET polyester base film to form nano bulge structures, the pre-coating layer coating is prepared from the following components in parts by weight: 10 to 20 parts of PDMS-b-PCL diblock copolymer, 20 to 30 parts of waterborne polyurethane adhesive, 50 to 60 parts of waterborne polyester, 10 to 20 parts of waterborne polyolefin, 5 to 10 parts of waterborne cross-linking agent and solvent, and the solid content of the pre-coating layer coating is 3 to 3.5 percent. According to the invention, a special water-based resin material PDMS-b-PCL is added into the coating liquid of the pre-coating layer, and a nano convex structure is formed in the drying and curing process of the coating layer, so that an anti-adhesion effect is achieved, and the haze of the film is not improved.

Description

Technical Field

[0001] The invention relates to an optical polyester film capable of preventing rolling and sticking, belonging to the technical field of optical polyester films. Background Art

[0002] At present, optical-grade polyester films with double-sided pre-coating are prone to adhesion problems during the winding process due to their low haze. A common solution is to add inorganic or organic nanoparticles to the pre-coating layer to create protrusions on the surface of the film to prevent the two layers of the rolled film from fitting tightly together and causing adhesion. The pre-coating layer is a water-based primer applied to the surface of the polyester film. Its general function is to increase the adhesion of the polyester film and improve the adhesion of various functional coatings applied on the polyester film. Conventionally, the pre-coating layer is composed of a main structure of a water-based resin and a water-based curing agent, which play a role in improving adhesion, while nano-scale organic or inorganic particles play an anti-adhesion role. However, nano-scale particles are generally silicon oxides, and their addition will lead to an increase in the haze of the coating. Summary of the invention

[0003] In order to overcome the drawbacks of the prior art, the present invention provides an optical polyester film that prevents rolling and adhesion. A special water-based resin material PDMS-b-PCL is added to the pre-coating liquid, which forms a nano-protrusion structure during the drying and curing process of the coating, thereby achieving an anti-adhesion effect without increasing the haze of the film.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] An optical polyester film that prevents rolling and adhesion, the polyester film comprises a PET polyester base film and a pre-coating layer coated on both sides of the PET polyester base film to form a nano-convex structure, the pre-coating layer coating comprises the following components in parts by weight: 10-20 parts of PDMS-b-PCL diblock copolymer, 20-30 parts of waterborne polyurethane, 50-60 parts of waterborne polyester, 10-20 parts of waterborne polyolefin, 5-10 parts of waterborne crosslinking agent and solvent, water is used as solvent in the pre-coating layer coating, and the coating has a solid content of 3%-3.5%.

[0006] The above-mentioned anti-rolling and adhesion optical polyester film, the molecular weight ratio of PDMS to PCL in the PDMS-b-PCL diblock copolymer is 1:1-2, the PDMS is a monohydroxy-terminated polydimethylsiloxane with a molecular weight of 500g / mol, and the molecular weight of PCL is 500-1000g / mol.

[0007] The above-mentioned anti-rolling and sticking optical polyester film, the water-based polyurethane specifically adopts polyester, polyether or polycarbonate polyol as a soft segment, and is formed by a condensation reaction with aromatic (such as toluene diisocyanate TDI, diphenylmethane diisocyanate MDI) or aliphatic (such as hexamethylene diisocyanate HDI, isophorone diisocyanate IPDI) isocyanate, and dimethylol propionic acid (DMPA), sulfonate monomer (such as 5-sulfoisophthalic acid) or polyethylene glycol (PEG) can be introduced to improve hydrophilicity, preferably CX6901 Chuangda Technology or AH-K100 Dawei Huatai brand water-based polyurethane.

[0008] The above-mentioned anti-rolling and sticking optical polyester film, the water-based polyester is a water-based polyester formed by the condensation reaction of diols (such as ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol CHDM) and dibasic acid (such as terephthalic acid, isophthalic acid, adipic acid, sebacic acid, succinic acid or cyclohexanedicarboxylic acid) monomers, and trimethylolpropane (TMP) or glycerol can be added to introduce appropriate cross-linking points to improve performance. Preferably, the water-based polyester is NOVOC ws350 Hanhai Technology or WS452 Hanhai Technology brand.

[0009] The above-mentioned optical polyester film that prevents rolling and sticking, the water-based polyolefin includes modified or unmodified polyethylene, polypropylene, polybutene and copolymers or mixtures thereof, and the polyolefin can be chemically modified by introducing carboxyl groups, hydroxyl groups, ester groups, epoxy groups, amide groups, sulfonic acid groups or other polar groups, or can be made water-based by physical dispersion and emulsification methods.

[0010] In the above-mentioned optical polyester film that prevents rolling and sticking, the water-based crosslinking agent is one of carbodiimide, isocyanate or aziridine crosslinking agents.

[0011] In the above-mentioned optical polyester film that prevents rolling and sticking, the protrusion height of the nano-protrusion structure formed by the pre-coating layer is 0.1-0.2 μm.

[0012] A method for preparing an optical polyester film that prevents rolling and sticking, the method comprising the following steps:

[0013] S1, after crystallization and drying at 150-180° C., the PET polyester film raw material slices are sent to the corresponding extrusion system for melt extrusion, and then the unoriented cast thick slices are obtained on the rotating cooling roller through the die head, and then the cooled cast thick slices are heated to 80-120° C. and longitudinally stretched 1-3 times to obtain PET polyester film sheets;

[0014] S2, weighing the formulated amount of PDMS-b-PCL diblock copolymer, waterborne polyurethane adhesive, waterborne polyester, waterborne polyolefin and waterborne crosslinking agent, mixing them evenly, adding solvent water, mixing them evenly again, vacuum degassing, and curing to obtain a pre-coating coating;

[0015] S3, coating the pre-coating coating on both sides of the PET polyester film sheet obtained in step S1 by using a coating device, heating and drying the double-sided coated film at 100-180° C., and then transversely stretching the film by 3-4 times to obtain a transversely stretched film;

[0016] S4, heat-setting the transversely stretched film at 250-255° C., and rolling it up after cooling, to obtain a double-sided pre-coated optical polyester film that prevents rolling and sticking.

[0017] In the method for preparing the above-mentioned anti-rolling and adhesion optical polyester film, in the step S2, the preparation method of the PDMS-b-PCL diblock copolymer is:

[0018] Preparation of reaction mixture: HO-PDMS and ε-CL were added to the reactor in a predetermined molar ratio, and a small amount of stannous octoate was added (the amount of catalyst was 0.05–0.1% of the total mass of the monomers);

[0019] Reaction protection: Purge the reactor with nitrogen or argon to prevent oxygen from interfering with the reaction;

[0020] Heating reaction: Heat the reactor to 120-140°C and maintain this temperature for 8-24 hours while stirring to ensure uniform reaction;

[0021] Cooling and termination: After the reaction is completed, cool to room temperature and add DMSO dimethyl sulfoxide to dissolve to obtain a PDMS-b-PCL copolymer liquid.

[0022] The ring-opening polymerization of ε-caprolactone (ε-CL) was initiated by monohydroxy-terminated polydimethylsiloxane (HO-PDMS), and the reaction formula is:

[0023]

[0024] Where n is the number of repeating units of poly-ε-caprolactone, and HO-PDMS refers to monohydroxypolydimethylsiloxane.

[0025] The beneficial effects of the present invention are:

[0026] The present invention adds a PDMS-b-PCL diblock copolymer to the coating liquid of the pre-coating layer coated on both sides of the PET polyester base film. The PDMS-b-PCL diblock copolymer can form a nanostructure in the process of drying and curing. The nanostructure has an anti-adhesion effect, and the coating formed by the PDMS-b-PCL diblock copolymer can also increase the adhesion of the polyester film coating. The material is used to achieve the effect of adding nano-smooth particles, which is required in previous solutions, and the effect of increasing the haze of the coating due to the addition of inorganic nanoparticles will not be produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the double-sided pre-coated optical polyester film of the present invention.

[0028] In the figure: 1. PET polyester base film; 2. pre-coating layer; 3. nano-protrusion structure. DETAILED DESCRIPTION

[0029] The PDMS-b-PCL diblock copolymer is added to the pre-coating coating liquid of the present invention, and during the drying and curing process, the PDMS-b-PCL diblock copolymer itself can form a nanostructure, and the nanostructure has an anti-adhesion effect. Specifically: the process of the PDMS-b-PCL diblock copolymer forming a nanostructure in the system is due to the incompatibility between the hydrophobic PDMS and the relatively hydrophilic PCL blocks in its molecular structure. During the drying and curing process of the coating liquid, the evaporation of the solvent causes the concentration of the system to increase, and the two blocks undergo microphase separation. Due to its low surface energy characteristics, the PDMS migrates to the surface of the coating and aggregates to form nano-protrusions, while the PCL provides support and substrate adhesion. The water-based polyurethane acts as an adhesive to enhance the adhesion and flexibility of the coating; the water-based polyester provides additional mechanical strength and durability; the water-based polyolefin improves the hydrophobicity of the coating and enhances the anti-adhesion effect; the water-based cross-linking agent promotes the cross-linking reaction of the coating, so that the coating maintains a stable structure during the drying process. Ultimately, under the combined effects of thermodynamics and kinetics, these components work synergistically to form a stable nanoscale protrusion structure that optimizes the film's anti-blocking properties, transparency, and adhesion.

[0030] The present invention controls the molecular weight ratio of PDMS to PCL in the PDMS-b-PCL diblock copolymer to be 1:1-2, and the obtained PDMS-b-PCL diblock copolymer has the largest intermolecular force, thereby achieving the best adhesion effect of the polyester film coating.

[0031] In the embodiment of the present invention, the protrusion height of the nano-protrusion structure is 0.1-0.2 μm. The main reason is that if the protrusion structure is too high, it will affect the use of the optical polyester film. Controlling the protrusion height at 0.1-0.2 μm can make the polyester film coating have the best anti-adhesion effect.

[0032] In the embodiment of the present invention, by using a mixture of PDMS-b-PCL diblock copolymer, waterborne polyurethane, waterborne polyester, waterborne polyolefin and waterborne crosslinking agent, the molecular groups of the PDMS-b-PCL diblock copolymer can be tightly connected with each other and bonded into a nano-coating with strong curing effect and better adhesion, thereby enhancing the adhesion to the PET base film.

[0033] The following will be combined with the embodiments of the present invention and the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0034] Example 1

[0035] A double-sided pre-coated optical polyester film with anti-rolling adhesion comprises a PET polyester film and a pre-coating layer coated on both sides of the PET polyester film and capable of forming a nano-protrusion structure. The raw materials of the pre-coating layer comprise, by weight, 15 parts of a PDMS-b-PCL diblock copolymer, 25 parts of waterborne polyurethane (CX6901, Chuangda Technology), 55 parts of waterborne polyester (NOVOC ws350, Hanhai Technology), 15 parts of a polyethylene resin (SGR-181WPP, Changhao Chemical), and 7 parts of a waterborne carbodiimide cross-linking agent (HG-120, Guangzhou Hangeng New Materials Co., Ltd.). The molecular weight ratio of PDMS to PCL in the PDMS-b-PCL diblock copolymer is 1:1.5, the molecular weight of PDMS is 500 g / mol, and the molecular weight of PCL is 750 g / mol. Solvent water is added to adjust the solid content to 3.3%. After film formation, the protrusion height of the nano-protrusion structure is 0.15 μm, and the thickness of the pre-coating layer is 0.3 μm.

[0036] The method for preparing a double-sided pre-coated optical polyester film with anti-rolling adhesion comprises the following steps:

[0037] S1, after crystallization and drying at 170°C, the PET polyester film raw material slices are sent to the corresponding extrusion system for melt extrusion, and then the unoriented cast thick slices are obtained on the rotating cooling roller through the die head, and then the cooled cast thick slices are heated to 100°C and longitudinally stretched by 2 times to obtain the PET polyester film film;

[0038] S2. In the presence of a catalyst, stannous octoate, a monohydroxy-terminated polydimethylsiloxane is used to initiate the ring-opening polymerization of ε-caprolactone to obtain a PDMS-b-PCL diblock copolymer, and the PDMS-b-PCL diblock copolymer, waterborne polyurethane, waterborne polyester, waterborne polyolefin and waterborne crosslinking agent are weighed, mixed, vacuum-defoamed again, and water is added to the required solid content to obtain a pre-coating coating;

[0039] S3, coating the pre-coating coating on both sides of the PET polyester film sheet obtained in step S1 by using a coating device, heating and drying the double-sided coated film at 140° C., and then transversely stretching it 2.5 times to obtain a transversely stretched film;

[0040] S4, heat-setting the transversely stretched film at 253° C., and rolling it up after cooling, to obtain a double-sided pre-coated optical polyester film that prevents rolling and sticking.

[0041] Example 2

[0042] A double-sided pre-coated optical polyester film with anti-rolling adhesion comprises a PET polyester film and a pre-coating layer coated on both sides of the PET polyester film to form a nano-protrusion structure. The raw materials of the pre-coating layer include, by weight, 10 parts of a PDMS-b-PCL diblock copolymer, 20 parts of waterborne polyurethane (AH-K100, Dawei Huatai), 50 parts of waterborne polyester (NOVOC ws350, Hanhai Technology), 10 parts of a polyethylene resin (SGR-181WPP, Changhao Chemical), and 5 parts of a waterborne isocyanate crosslinking agent (HXR 100, Tosoh Chemical). The molecular weight ratio of PDMS to PCL in the PDMS-b-PCL diblock copolymer is 1:1, the molecular weight of PDMS is 500 g / mol, the molecular weight of PCL is 500 g / mol, the solid content is adjusted to 3.1% by adding solvent water, and the protrusion height of the nano-protrusion structure is 0.1 μm. The thickness of the pre-coating layer is 0.29 μm.

[0043] The embodiment of the present invention also provides a method for preparing a double-sided pre-coated optical polyester film that prevents rolling and sticking, which specifically includes the following steps:

[0044] S1, after crystallization and drying at 150°C, the PET polyester film raw material slices are sent to the corresponding extrusion system for melt extrusion, and then the unoriented cast thick slices are obtained on the rotating cooling roller through the die head, and then the cooled cast thick slices are heated to 80°C and longitudinally stretched by 1 times to obtain the PET polyester film film;

[0045] S2. In the presence of a catalyst, stannous octoate, a monohydroxy-terminated polydimethylsiloxane is used to initiate the ring-opening polymerization of ε-caprolactone to obtain a PDMS-b-PCL diblock copolymer, and the PDMS-b-PCL diblock copolymer, waterborne polyurethane, waterborne polyester, waterborne polyolefin and waterborne crosslinking agent are weighed, mixed, vacuum-defoamed again, and water is added to the required solid content to obtain a pre-coating coating;

[0046] S3, coating the pre-coating coating on both sides of the PET polyester film sheet obtained in step S1 by using a coating device, heating and drying the double-sided coated film at 100° C., and then transversely stretching it by 2 times to obtain a transversely stretched film;

[0047] S4, heat-setting the transversely stretched film at 250° C., and rolling it up after cooling, to obtain a double-sided pre-coated optical polyester film that prevents rolling and sticking.

[0048] Example 3

[0049] A double-sided pre-coated optical polyester film with anti-rolling adhesion comprises a PET polyester film and a pre-coating layer coated on both sides of the PET polyester film and capable of forming a nano-protrusion structure. The raw materials of the pre-coating layer comprise, by weight, 20 parts of a PDMS-b-PCL diblock copolymer, 30 parts of waterborne polyurethane (CX6901, Chuangda Technology), 60 parts of waterborne polyester (NOVOC ws350, Hanhai Technology), 20 parts of a polyethylene resin (SGR-181WPP, Changhao Chemical), and 10 parts of a waterborne aziridine crosslinking agent (HG-100, Guangzhou Hangeng New Materials Co., Ltd.). The molecular weight ratio of PDMS to PCL in the PDMS-b-PCL diblock copolymer is 1:2, the molecular weight of PDMS is 500 g / mol, the molecular weight of PCL is 1000 g / mol, the protrusion height of the nano-protrusion structure is 0.2 μm, the solid content is adjusted to 3.5% by adding solvent water, and the thickness of the pre-coating layer is 0.35 μm.

[0050] The embodiment of the present invention also provides a method for preparing a double-sided pre-coated optical polyester film that prevents rolling and sticking, which specifically includes the following steps:

[0051] S1, after crystallization and drying at 180°C, the PET polyester film raw material slices are sent to the corresponding extrusion system for melt extrusion, and then the unoriented cast thick slices are obtained on the rotating cooling roller through the die head, and then the cooled cast thick slices are heated to 120°C and longitudinally stretched 3 times to obtain the PET polyester film film;

[0052] S2. In the presence of a catalyst, stannous octoate, a monohydroxy-terminated polydimethylsiloxane is used to initiate the ring-opening polymerization of ε-caprolactone to obtain a PDMS-b-PCL diblock copolymer, and the PDMS-b-PCL diblock copolymer, waterborne polyurethane, waterborne polyester, waterborne polyolefin and waterborne crosslinking agent are weighed, mixed, vacuum-defoamed again, and solvent water is added to the required solid content to obtain a pre-coating coating;

[0053] S3, coating the pre-coating coating on both sides of the PET polyester film sheet obtained in step S1 by using a coating device, heating and drying the double-sided coated film at 180° C., and then transversely stretching it 3 times to obtain a transversely stretched film;

[0054] S4, heat-setting the transversely stretched film at 255° C., and rolling it up after cooling, to obtain a double-sided pre-coated optical polyester film that prevents rolling and sticking.

[0055] Example 4

[0056] A double-sided pre-coated optical polyester film with anti-rolling adhesion comprises a PET polyester film and a pre-coating layer coated on both sides of the PET polyester film to form a nano-protrusion structure. The raw materials of the pre-coating layer include, by weight, 13 parts of a PDMS-b-PCL diblock copolymer, 23 parts of waterborne polyurethane (AH-K100 Dawei Huatai), 53 parts of waterborne polyester (WS452 Hanhai Technology), 13 parts of a polyethylene resin (SGR-181WPP Changhao Chemical) and 6 parts of a waterborne carbodiimide crosslinking agent (PT-1002S Green Protection New Material). The molecular weight ratio of PDMS to PCL in the PDMS-b-PCL diblock copolymer is 1:1.2, the molecular weight of PDMS is 500 g / mol, the molecular weight of PCL is 600 g / mol, the solid content is adjusted to 3.0% by adding solvent water, and the protrusion height of the nano-protrusion structure is 0.13 μm. The thickness of the pre-coating layer is 0.28 μm.

[0057] The embodiment of the present invention also provides a method for preparing a double-sided pre-coated optical polyester film that prevents rolling and sticking, which specifically includes the following steps:

[0058] S1, after crystallization and drying at 160°C, the PET polyester film raw material slices are sent to the corresponding extrusion system for melt extrusion, and then the unoriented cast thick slices are obtained on the rotating cooling roller through the die head, and then the cooled cast thick slices are heated to 90°C and longitudinally stretched 1.5 times to obtain the PET polyester film film;

[0059] S2. In the presence of a catalyst, stannous octoate, a monohydroxy-terminated polydimethylsiloxane is used to initiate the ring-opening polymerization of ε-caprolactone to obtain a PDMS-b-PCL diblock copolymer, and the PDMS-b-PCL diblock copolymer, a water-based polyurethane adhesive, a water-based polyester, a water-based polyolefin and a water-based crosslinking agent are weighed, mixed, vacuum-defoamed again, and solvent water is added to the required solid content to obtain a pre-coating coating;

[0060] S3, coating the pre-coating coating on both sides of the PET polyester film sheet obtained in step S1 by using a coating device, heating and drying the double-sided coated film at 130° C., and then transversely stretching the film by 2.3 times to obtain a transversely stretched film;

[0061] S4, heat-setting the transversely stretched film at 252° C., and rolling it up after cooling, to obtain a double-sided pre-coated optical polyester film that prevents rolling and sticking.

[0062] Comparative Example 1

[0063] A double-sided pre-coated optical polyester film with anti-rolling and adhesion, comprising a PET polyester film and a pre-coating layer coated on both sides of the PET polyester film to form a nano-protrusion structure, wherein the raw materials of the pre-coating layer include, by weight: 13 parts of silica sol with an average particle size of 150 nanometers (Anhui Kaisheng), 23 parts of water-based polyurethane (CX6901 Chuangda Technology), 53 parts of water-based polyester (WS452 Hanhai Technology), 13 parts of polyethylene resin (SGR-181WPP Changhao Chemical) and 6 parts of water-based carbodiimide cross-linking agent (HG-120 Guangzhou Hangeng New Materials Co., Ltd.), solvent water is added to adjust the solid content to 3.0%, the protrusion height of the nano-protrusion structure is 0.13μm, and the thickness of the pre-coating layer is 0.28μm.

[0064] The comparative example of the present invention also provides a method for preparing a double-sided pre-coated optical polyester film that prevents rolling and sticking, which specifically comprises the following steps:

[0065] S1, after crystallization and drying at 160°C, the PET polyester film raw material slices are sent to the corresponding extrusion system for melt extrusion, and then the unoriented cast thick slices are obtained on the rotating cooling roller through the die head, and then the cooled cast thick slices are heated to 90°C and longitudinally stretched 1.5 times to obtain the PET polyester film film;

[0066] S2, mixing the aqueous silica sol, aqueous polyurethane, aqueous polyester, aqueous polyolefin and aqueous crosslinking agent, vacuum degassing again, adding solvent water to the required solid content, and preparing the pre-coating coating;

[0067] S3, coating the pre-coating coating on both sides of the PET polyester film sheet obtained in step S1 by using a coating device, heating and drying the double-sided coated film at 130° C., and then transversely stretching the film by 2.3 times to obtain a transversely stretched film;

[0068] S4, heat-setting the transversely stretched film at 252° C., and rolling it up after cooling, to obtain a double-sided pre-coated optical polyester film that prevents rolling and sticking.

[0069] Application testing:

[0070] The double-sided pre-coated optical polyester film with anti-rolling and adhesion prepared by the preparation method of the double-sided pre-coated optical polyester film with anti-rolling and adhesion of Examples 1-4 of the present invention was used as an experimental object, and 150 nanometer silica commonly used in polyester film was selected to replace the PDMS-b-PCL diblock copolymer as a comparative example, and the haze, adhesion and adhesion test experiments of the film were carried out respectively. Specifically, the optical films of Examples 1-4 and the optical film of the comparative example were measured by a haze meter, and the haze measurement results are shown in Table 1.

[0071] At the same time, the optical films of Examples 1-4 and the comparative example were rolled up to the same number of times, and after being subjected to the same pressure and time by a press, each film was opened to observe and record the adhesion degree of each film. The test structure is shown in Table 1.

[0072] Table 1 Application test experimental data table

[0073]

[0074] It can be seen from the test results in Table 1 that the anti-rolling and adhesion double-sided pre-coated optical polyester film prepared by the preparation method of the anti-rolling and adhesion double-sided pre-coated optical polyester film of Examples 1-4 of the present invention is significantly better than the common silica optical polyester film on the market in terms of haze, adhesion and stickiness. In particular, the commonly used silica easily causes the haze of the film to increase. The haze, adhesion and stickiness of the anti-rolling and adhesion double-sided pre-coated optical polyester film prepared by the preparation method of the anti-rolling and adhesion double-sided pre-coated optical polyester film of Example 1 of the present invention are the best compared with other embodiments, so Example 1 of the present invention is the best embodiment.

Claims

1. An optical polyester film for preventing rolling and sticking, characterized in that: The polyester film includes a PET polyester base film and a pre-coating layer coated on both sides of the PET polyester base film to form a nano-protrusion structure. The pre-coating layer coating includes the following components in parts by weight: 10-20 parts of PDMS-b-PCL diblock copolymer, 20-30 parts of water-based polyurethane, 50-60 parts of water-based polyester, 10-20 parts of water-based polyolefin, 5-10 parts of water-based cross-linking agent and solvent. The solid content of the pre-coating layer coating is 3%-3.5%.

2. The anti-rolling and sticking optical polyester film according to claim 1, characterized in that: The molecular weight ratio of PDMS to PCL in the PDMS-b-PCL diblock copolymer is 1:1-2, the PDMS is monohydroxyl-terminated polydimethylsiloxane with a molecular weight of 500 g / mol, and the molecular weight of PCL is 500-1000 g / mol.

3. The anti-rolling and blocking optical polyester film according to claim 1, characterized in that: The waterborne polyurethane is specifically formed by a polycondensation reaction of a polyol and a polyisocyanate, wherein the polyol is a polyester polyol, a polyether polyol or a polycarbonate polyol, and the polyisocyanate is one of toluene diisocyanate TDI, diphenylmethane diisocyanate MDI, hexamethylene diisocyanate HDI, or isophorone diisocyanate IPDI.

4. The anti-rolling and blocking optical polyester film according to claim 1, characterized in that: The water-based polyester is formed by a condensation reaction of a diol and a dibasic acid monomer, wherein the diol includes one of ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol or 1,4-cyclohexanedimethanol (CHDM), and the dibasic acid includes one of terephthalic acid, isophthalic acid, adipic acid, sebacic acid, succinic acid or cyclohexanedicarboxylic acid.

5. The anti-rolling and blocking optical polyester film according to claim 1, characterized in that: The waterborne polyolefin includes modified or unmodified polyethylene, polypropylene, polybutylene and copolymers or mixtures thereof.

6. The anti-rolling and blocking optical polyester film according to claim 1, characterized in that: The aqueous crosslinking agent is one of carbodiimide, isocyanate or aziridine crosslinking agents.

7. The anti-rolling and blocking optical polyester film according to claim 1, characterized in that: The protrusion height of the nano-protrusion structure formed by the pre-coating layer is 0.1-0.2 μm.

8. A method for preparing an optical polyester film having anti-rolling adhesion according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: S1. After crystallization and drying at 150-180° C., the PET polyester film raw material slices are sent to the corresponding extrusion system for melt extrusion, and then the unoriented cast thick slices are obtained on the rotating cooling roller through the die head, and then the cooled cast thick slices are heated to 80-120° C. and longitudinally stretched 1-3 times to obtain PET polyester film sheets; S2, weighing the formulated amount of PDMS-b-PCL diblock copolymer, waterborne polyurethane adhesive, waterborne polyester, waterborne polyolefin and waterborne crosslinking agent, mixing them evenly, adding solvent water, mixing them evenly again, vacuum degassing, and curing to obtain a pre-coating coating; S3, coating the pre-coating coating on both sides of the PET polyester film sheet obtained in step S1 by using a coating device, heating and drying the double-sided coated film at 100-180° C., and then transversely stretching the film by 3-4 times to obtain a transversely stretched film; S4, heat-setting the transversely stretched film at 250-255°C, and rolling it up after cooling, to obtain a double-sided pre-coated optical polyester film that prevents rolling and sticking.

9. The method for preparing the anti-rolling and sticking optical polyester film according to claim 8, characterized in that: In the step S2, the preparation method of the PDMS-b-PCL diblock copolymer is: in the presence of a catalyst, the PDMS-b-PCL diblock copolymer is prepared by ring-opening polymerization of ε-caprolactone initiated by monohydroxy-terminated polydimethylsiloxane.

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