Long-acting antistatic home decoration PET (Polyethylene Terephthalate) film and preparation method of coating for film

Abstract

The invention belongs to the technical field of organic coatings, and particularly relates to a long-acting antistatic home decoration PET (Polyethylene Terephthalate) film and a preparation method of a coating for the film. Comprising the following steps: stirring and mixing methyl trialkoxysilane, methyl phenyl dialkoxysilane, methyl vinyl dialkoxysilane, vinyl trialkoxysilane, propyl trialkoxysilane and a catalyst at normal temperature to prepare a component A; mixing an ATO solution and silica sol to obtain ATO modified silica sol, and stirring and mixing the ATO modified silica sol with a functional aid at normal temperature to obtain a component B; trimethyl alkoxy silane and trimethyl silanol are stirred and mixed at the normal temperature, and a component C is prepared; carrying out corona treatment on the PET film material to prepare a pretreated base material; at the room temperature, the component A and the component B are firstly mixed and reacted for 20-30 min, then the component C is added and stirred to react for 20-30 min, the mixture is filtered and coated on the surface of the pretreated base material in a rolling mode, drying is conducted, and the coating for the PET film is prepared after curing is conducted in the environment of 130-150 DEG C; wherein the mass ratio of the component A to the component B to the component C is (1: 1: 0.1)-(1: 2: 0.4).

Description

Technical Field

[0001] The present invention belongs to the technical field of organic coatings, and particularly relates to a long-lasting antistatic home decoration PET film and a preparation method of a coating for the film. Background Art

[0002] The home decoration PET film is a new type of environmentally friendly decorative material, which is made of polyethylene terephthalate (PET) as the base material through a special process, and is widely used in home decoration fields such as furniture, walls, and cabinets, and needs to meet the requirements of graffiti and wiping during use.

[0003] At the same time, the PET film material is a polar electrical insulating material. When it is subjected to mechanical actions such as production, die-cutting and punching, winding and unwinding, etc., charges will be generated but cannot be effectively conducted and released, thus accumulating static electricity on the material surface. During the winding process of the PET film material, interlayer adhesion occurs due to static electricity adsorption, affecting subsequent slitting processing. Currently, coating an antistatic coating on the PET substrate has the highest cost performance. However, in traditional antistatic coatings, antistatic agents with relatively low molecular weights are added, which are not completely compatible with the matrix. During use, the antistatic agent continuously migrates out from the inside, absorbs moisture in the air through the end hydrophilic groups, conducts static charges, and reduces the surface resistance of the plastic matrix. This makes the traditional antistatic agent have certain limitations during use. For example, it needs to act under certain air humidity conditions; it takes a certain migration time to achieve antistatic effect, and the antistatic effect will not appear immediately; moreover, with wiping or washing during use, the surface antistatic agent gradually disappears, and the internal antistatic agent molecules continuously migrate to the surface until completely consumed. Therefore, the action effect of the traditional antistatic agent has a certain time range and is not permanent.

[0004] Therefore, how to overcome the attenuation of antistatic performance caused by wiping during the use of home decoration PET film is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Invention

[0006] The embodiments of the present disclosure at least provide a long-lasting antistatic home decoration PET film and a preparation method of a coating for the film.

[0007] In a first aspect, an embodiment of the present disclosure provides a method for preparing a coating for a PET film, including the following steps: stirring and mixing methyltrialkoxysilane, methylphenyldialkoxysilane, methylvinyldialkoxysilane, vinyltrialkoxysilane, propyltrialkoxysilane, and a catalyst at room temperature to obtain component A; mixing an ATO solution and silica sol to obtain ATO-modified silica sol, and then stirring and mixing with a functional auxiliary at room temperature to obtain component B; stirring and mixing trimethylalkoxysilane and trimethylsilanol at room temperature to obtain component C; corona treating a PET film material to obtain a pretreated substrate; at room temperature, first mixing and reacting component A and component B for 20 - 30 min, then adding component C and stirring and reacting for 20 - 30 min, filtering, and roll-coating onto the surface of the pretreated substrate, drying, and curing at 130 - 150 °C to obtain a coating for a PET film; wherein, the mass ratio of component A, component B, and component C is 1:1:0.1 - 1:2:0.4.

[0008] In an alternative embodiment, component A includes the following raw materials in parts by mass: 60 - 80 parts of methyltrialkoxysilane, no more than 10 parts of methylphenyldialkoxysilane, no more than 10 parts of methylvinyldialkoxysilane, no more than 10 parts of vinyltrialkoxysilane, no more than 10 parts of propyltrialkoxysilane, and 0.5 - 3 parts of a catalyst; component B includes the following raw materials in parts by mass: 20 - 30 parts of an ATO solution, 60 - 75 parts of silica sol, and 1.5 - 5.5 parts of a functional auxiliary; component C includes the following raw materials in parts by mass: 70 - 80 parts of trimethylalkoxysilane and 20 - 30 parts of trimethylsilanol.

[0009] In an alternative embodiment, in component A, the methyltrialkoxysilane includes at least one of methyltrimethoxysilane and methyltriethoxysilane; the methylphenyldialkoxysilane includes at least one of methylphenyldimethoxysilane and methylphenyldiethoxysilane; the methylvinyldialkoxysilane includes at least one of methylvinyldimethoxysilane and methylvinyldiethoxysilane; the vinyltrialkoxysilane includes at least one of vinyltrimethoxysilane and vinyltriethoxysilane; the propyltrialkoxysilane includes at least one of propyltrimethoxysilane and propyltriethoxysilane; the catalyst includes a mixed solution of any one or more of formic acid, acetic acid, and citric acid.

[0010] In an alternative embodiment, in component B, the ATO solution includes the following components in parts by mass: 20 - 30 parts of stannous chloride dihydrate, 50 - 60 parts of ethanol, and 10 - 30 parts of antimony trichloride.

[0011] In an alternative embodiment, in the B component, the pH value of the silica sol is 4 to 6, and the particle size is 5 to 50 nm; and the functional additives include defoamers, wetting and leveling agents, and anti-sagging agents.

[0012] In an alternative embodiment, in the C component, the trimethylalkoxysilane includes at least one of trimethylmethoxysilane and trimethylethoxysilane.

[0013] In an alternative embodiment, the method for preparing the ATO solution is as follows: Dissolve stannous chloride dihydrate in ethanol, stir at room temperature for 1 h, then add antimony trichloride, and stir in a water bath at no less than 60 °C for 4 h. The liquid obtained after cooling is the ATO solution.

[0014] In an alternative embodiment, the method for preparing the ATO-modified silica sol is as follows: Drop the ATO solution, defoamer, wetting and leveling agent, and anti-sagging agent into the acidic silica sol, stir and disperse in a water bath at no less than 40 °C for 2 h. The liquid obtained after cooling is the ATO-modified silica sol.

[0015] In an alternative embodiment, the mixing and stirring reaction of the A component and the B component specifically includes stirring and reacting at 500 - 800 r / min for 20 - 30 min; the duration of adding the C component and stirring and reacting is 20 - 30 min; and the curing temperature is 130 - 150 °C, and the curing time is 2 - 4 min.

[0016] In a second aspect, the embodiments of the present disclosure further provide a long-lasting antistatic home decoration PET film, including: a PET film material and a PET film coating formed on the surface of the PET film material by using the method described above.

[0017] The beneficial effects of the present invention are that the preparation method of the long-lasting antistatic home decoration PET film and its film coating forms a dense -Si-O-Si- structure through the hydrolysis and condensation of organosilicon monomers, and introduces trimethylalkoxysilane for hydroxyl capping, further improving the hydrophobic durability of the coating, thereby endowing the coating with excellent cleaning and graffiti removal performance; at the same time, introducing the wide-bandgap transparent semiconductor material antimony-doped tin oxide (ATO), in which SnO2 is embedded into the gel framework of SiO2 by polycondensing with -Si-OH- to form a three-dimensional network structure of -Sn-O-Si-. Part of the Sn 4+ is replaced by Sb 3+ to form a p-type semiconductor, which increases the carrier concentration and thus makes the coating conductive. Its antistatic effect is more persistent, not easily affected by wiping and washing, enabling the PET film material to be used without being affected by static adsorption during production, die-cutting, and winding and unwinding, and not easily adsorbing dust and lint, affecting the aesthetics in the follow-up, while improving the stain resistance of the home decoration PET film and reducing the difficulty of graffiti removal.

[0018] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention are realized and attained by the structure particularly pointed out in the specification.

[0019] To make the above objectives, features, and advantages of the present invention more comprehensible, the following specific preferred embodiments are given for detailed description. Detailed Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] As used herein, phrases such as "in one embodiment", "according to one embodiment", "in some embodiments", etc. generally refer to the fact that the specific features, structures, or characteristics after the phrase can be included in at least one embodiment of the present disclosure. Thus, a specific feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, terms such as "example", "exemplary", etc. are used "for the purpose of serving as an example, instance, or illustration. Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other embodiments, aspects, or designs. Instead, the use of terms such as "example", "exemplary", etc. is intended to present concepts in a specific manner.

[0022] In this document, as used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0023] The terms used herein are for describing specific exemplary configurations only and are not intended to be limiting. As used herein, the singular articles "a", "an", and "the" may also be intended to include the plural forms, unless it is clearly stated otherwise in the context. The terms "comprising", "including", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their combinations. The method steps, processes, and operations described herein should not be construed as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an order of performance. Additional or alternative steps may be employed.

[0024] Existing antistatic effect coatings generally contain a certain amount of conductive / semiconductor components (conductive agents). Common conductive agents include non-metallic conductive particles (carbon nanotubes, carbon black, graphite), metal particles (Cu, Pt, Ag nanopowders), metal oxide semiconductors (ZnO, SnO2, In2O3), organic polymers (polyaniline, polypyrrole, polythiophene), etc.

[0025] During the use of such conductive agent components, due to the existence of minute pores in the surface coating, during repeated wiping and the intrusion of water vapor, the internal antistatic agent molecules continuously migrate to the surface, ultimately resulting in the gradual loss of the antistatic effect.

[0026] Regarding the defects existing in the above solutions, they are all results obtained by the inventors through practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed in the following disclosure of the present disclosure for the above problems should both be contributions made by the inventors to the present disclosure during the process of the present disclosure.

[0027] Some embodiments of the present invention will be described in detail below. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0028] An embodiment of the present disclosure provides a method for preparing a coating for a PET film, comprising the following steps: stirring and mixing methyltrialkoxysilane, methylphenyldialkoxysilane, methylvinyldialkoxysilane, vinyltrialkoxysilane, propyltrialkoxysilane, and a catalyst at room temperature to obtain component A; mixing an ATO solution and silica sol to obtain ATO-modified silica sol, and then stirring and mixing with a functional additive at room temperature to obtain component B; stirring and mixing trimethylalkoxysilane and trimethylsilanol at room temperature to obtain component C; subjecting the PET film material to corona treatment to obtain a pretreated substrate; at room temperature, first mixing and reacting component A and component B for 20 - 30 min, then adding component C and stirring and reacting for 20 - 30 min, filtering, roll-coating onto the surface of the pretreated substrate, drying, and curing at 130 - 150 °C to obtain a coating for a PET film; wherein, the mass ratio of component A, component B, and component C is 1:1:0.1 - 1:2:0.4.

[0029] In some embodiments, specifically, component A comprises raw materials in the following mass parts: 60 - 80 parts of methyltrialkoxysilane, no more than 10 parts of methylphenyldialkoxysilane, no more than 10 parts of methylvinyldialkoxysilane, no more than 10 parts of vinyltrialkoxysilane, no more than 10 parts of propyltrialkoxysilane, and 0.5 - 3 parts of a catalyst; component B comprises raw materials in the following mass parts: 20 - 30 parts of an ATO solution, 60 - 75 parts of silica sol, and 1.5 - 5.5 parts of a functional additive; component C comprises raw materials in the following mass parts: 70 - 80 parts of trimethylalkoxysilane and 20 - 30 parts of trimethylsilanol.

[0030] In some embodiments, specifically, in component A, the methyltrialkoxysilane comprises at least one of methyltrimethoxysilane and methyltriethoxysilane; the methylphenyldialkoxysilane comprises at least one of methylphenyldimethoxysilane and methylphenyldiethoxysilane; the methylvinyldialkoxysilane comprises at least one of methylvinyldimethoxysilane and methylvinyldiethoxysilane; the vinyltrialkoxysilane comprises at least one of vinyltrimethoxysilane and vinyltriethoxysilane; the propyltrialkoxysilane comprises at least one of propyltrimethoxysilane and propyltriethoxysilane; the catalyst comprises a mixed solution of any one or more of formic acid, acetic acid, and citric acid.

[0031] In some embodiments, specifically, in component B, the ATO solution comprises the following components in mass parts: 20 - 30 parts of stannous chloride dihydrate (SnCl2·2H2O), 50 - 60 parts of ethanol, and 10 - 30 parts of antimony trichloride (SbCl3).

[0032] In some embodiments, specifically, in the B component, the pH value of the silica sol is 4 to 6, and the particle size is 5 to 50 nm; and the functional additives include an antifoaming agent, a wetting and leveling agent, and an anti-sagging agent.

[0033] In some embodiments, specifically, in the C component, the trimethylalkoxysilane includes at least one of trimethylmethoxysilane and trimethylethoxysilane.

[0034] In some embodiments, specifically, the method for preparing the ATO solution is as follows: Dissolve stannous chloride dihydrate in ethanol, stir at room temperature for 1 h, then add antimony trichloride, and stir in a water bath at no less than 60 °C for 4 h. The liquid obtained after cooling is the ATO solution.

[0035] In some embodiments, specifically, the method for preparing the ATO-modified silica sol is as follows: Drop the ATO solution, the antifoaming agent, the wetting and leveling agent, and the anti-sagging agent into the acidic silica sol, and stir and disperse in a water bath at no less than 40 °C for 2 h. The liquid obtained after cooling is the ATO-modified silica sol.

[0036] In some embodiments, specifically, the mixing and stirring reaction of the A component and the B component specifically includes stirring and reacting at 500 to 800 r / min for 20 to 30 min; the duration of adding the C component and stirring and reacting is 20 to 30 min; and the curing temperature is 130 to 150 °C, and the curing time is 2 to 4 min.

[0037] The embodiments of the present disclosure further provide a long-lasting antistatic home decoration PET film, including: a PET film material and a PET film coating formed on the surface of the PET film material by the method described above.

[0038] In the following examples, the self-made modified silica sol is prepared by modifying the acidic silica sol HS-4-30 (with a pH value of 4.5, a solid content of 30 wt%, and a silica sol particle size of 10 nm) produced by Zhejiang Yuda Chemical Co., Ltd. It can also be modified using silica sols produced by Jinan Quanxin Chemical Co., Ltd. or Guangdong Huierte Nano Technology Co., Ltd.

[0039] In the examples, the antifoaming agent is BYK-024 of BYK company, the wetting and leveling agent is BYK-3480 of BYK company, and the anti-sagging agent is RHEOBYK-7600 of BYK company.

[0040] The methods for detecting the coating properties are as follows: The adhesion is determined according to the method of GB / T 9286-1998; the light transmittance is determined according to the method of GB / T 2410-2008; the antistatic property is tested by a surface resistance meter, with multiple-point testing and taking the average value. The antifouling property is tested by making marks with oil-based pens (red, black, blue) and water-based pens, and wiping with dry paper or clear water after 24 h; the ethanol resistance is tested by wiping with 75% ethanol for 1000 times and observing the state of surface stains; the water resistance is tested by wiping with clear water for 1000 times and observing the surface state.

[0041] Example 1

[0042] Preparation of ATO solution: Dissolve 20 parts by mass of stannous chloride dihydrate in 55 parts by mass of ethanol, stir at room temperature for 1 h, then add 25 parts by mass of antimony trichloride, and stir in a water bath at 60 °C for 4 h. The liquid obtained after cooling is the antimony-doped tin oxide (ATO) solution.

[0043] Preparation of ATO-modified silica sol: Drop 25 parts by mass of ATO solution, 3 parts by mass of wetting and leveling agent, 1 part by mass of defoaming agent and 1 part by mass of anti-sagging agent into 70 parts by mass of silica sol and stir. Stir and disperse in a water bath at 40 °C for 2 h. The liquid obtained after cooling, filtering and packaging is the ATO-modified silica sol.

[0044] Example 2

[0045] Preparation of ATO solution: Dissolve 25 parts by mass of stannous chloride dihydrate in 55 parts by mass of ethanol, stir at room temperature for 1 h, then add 20 parts by mass of antimony trichloride, and stir in a water bath at 60 °C for 4 h. The liquid obtained after cooling is the antimony-doped tin oxide (ATO) solution.

[0046] Preparation of ATO-modified silica sol: Drop 20 parts by mass of ATO solution, 3 parts by mass of wetting and leveling agent, 1 part by mass of defoaming agent and 1 part by mass of anti-sagging agent into 75 parts by mass of silica sol and stir. Stir and disperse in a water bath at 40 °C for 2 h. The liquid obtained after cooling, filtering and packaging is the ATO-modified silica sol.

[0047] Example 3

[0048] Preparation of ATO solution: Dissolve 30 parts by mass of stannous chloride dihydrate in 50 parts by mass of ethanol, stir at room temperature for 1 h, then add 20 parts by mass of antimony trichloride, and stir in a water bath at 60 °C for 4 h. The liquid obtained after cooling is the antimony-doped tin oxide (ATO) solution.

[0049] Preparation of ATO-modified silica sol: Drop 30 parts by mass of ATO solution, 3 parts by mass of wetting and leveling agent, 1 part by mass of defoaming agent and 1 part by mass of anti-sagging agent into 65 parts by mass of silica sol and stir. Stir and disperse in a water bath at 40 °C for 2 h. The liquid obtained after cooling, filtering and packaging is the ATO-modified silica sol.

[0050] Example 4

[0051] Preparation of Component A: 80 parts by mass of methyltrimethoxysilane, 5 parts by mass of methylphenyldimethoxysilane, 5 parts by mass of methylvinyldimethoxysilane, 5 parts by mass of vinyltrimethoxysilane, 3 parts by mass of propyltrimethoxysilane, and 2 parts by mass of acetic acid, all of analytical pure grade commercially available, were successively added to a stirring tank and stirred evenly to obtain Component A.

[0052] Preparation of Component B: The ATO-modified silica sol prepared in Example 1 was used as Component B.

[0053] Preparation of Component C: 80 parts by mass of trimethylmethoxysilane and 20 parts by mass of trimethylsilanol, both of analytical pure grade commercially available, were added to a stirring tank and stirred evenly to obtain Component C.

[0054] Preparation of the coating: Components A, B, and C were formulated into paint in a ratio of 1:1:0.1. First, Components A and B were mixed and stirred at 500 - 800 r / min for 20 - 30 min, then Component C was added and mixed for another 20 - 30 min. After filtration through a 300-mesh sieve, the coating for PET film was obtained.

[0055] Preparation of the coating: The PET film material was treated by corona on a corona machine to obtain a pretreated substrate. The coating for PET film was roll-coated onto the surface of the substrate, with the film thickness controlled at about 2 μm, and then cured at 140°C for 3 min. A long-lasting antistatic and graffiti-able PET film coating was obtained.

[0056] Example 5

[0057] Preparation of Component A: 70 parts by mass of methyltrimethoxysilane, 4 parts by mass of methylphenyldimethoxysilane, 4 parts by mass of methylvinyldimethoxysilane, 10 parts by mass of vinyltrimethoxysilane, 10 parts by mass of propyltrialkoxysilane, and 2 parts by mass of acetic acid, all of analytical pure grade commercially available, were successively added to a stirring tank and stirred evenly to obtain Component A.

[0058] Preparation of Component B: The ATO-modified silica sol prepared in Example 2 was used as Component B.

[0059] Preparation of Component C: 75 parts by mass of trimethylmethoxysilane and 25 parts by mass of trimethylsilanol, both of analytical pure grade commercially available, were added to a stirring tank and stirred evenly to obtain Component C.

[0060] Preparation of the coating: Components A, B, and C were formulated into paint in a ratio of 1:1.5:0.2. First, Components A and B were mixed and stirred at 500 - 800 r / min for 20 - 30 min, then Component C was added and mixed for another 20 - 30 min. After filtration through a 300-mesh sieve, the coating for PET film was obtained.

[0061] Preparation of the coating: The PET film material is subjected to corona treatment on a corona machine to obtain a pretreated substrate. The coating for the PET film is roll-coated onto the surface of the substrate, and the film thickness is controlled to be about 2 μm, and then cured at 140 °C for 3 min. A long-lasting antistatic and graffiti-able PET film coating is obtained.

[0062] Example 6

[0063] Preparation of Component A: 65 parts by mass of methyltrimethoxysilane, 7 parts by mass of methylphenyldimethoxysilane, 8 parts by mass of methylvinyldimethoxysilane, 8 parts by mass of vinyltrimethoxysilane, 10 parts by mass of propyltrialkoxysilane, and 2 parts by mass of acetic acid of commercially available analytical pure grade are sequentially added to a stirring tank and stirred evenly to obtain Component A.

[0064] Preparation of Component B: The ATO-modified silica sol prepared in Example 3 is Component B.

[0065] Preparation of Component C: 70 parts by mass of trimethylmethoxysilane and 30 parts by mass of trimethylsilanol of commercially available analytical pure grade are added to a stirring tank and stirred evenly to obtain Component C.

[0066] Preparation of the coating: Components A, B, and C are mixed to prepare the paint in a ratio of 1:2:0.4. First, Components A and B are mixed and stirred and reacted at 500 - 800 r / min for 20 - 30 min, and then Component C is added and mixed and reacted for 20 - 30 min. It is filtered through a 300-mesh filter to obtain the coating for the PET film.

[0067] Preparation of the coating: The PET film material is subjected to corona treatment on a corona machine to obtain a pretreated substrate. The coating for the PET film is roll-coated onto the surface of the substrate, and the film thickness is controlled to be about 2 μm, and then cured at 140 °C for 3 min. A long-lasting antistatic and graffiti-able PET film coating is obtained.

[0068] Example 7

[0069] Preparation of Component A: 73 parts by mass of methyltrimethoxysilane, 7 parts by mass of methylphenyldimethoxysilane, 7 parts by mass of methylvinyldimethoxysilane, 8 parts by mass of vinyltrimethoxysilane, 8 parts by mass of propyltrialkoxysilane, and 2 parts by mass of acetic acid of commercially available analytical pure grade are sequentially added to a stirring tank and stirred evenly to obtain Component A.

[0070] Preparation of Component B: 3 parts by mass of a wetting and leveling agent, 1 part by mass of an antifoaming agent, and 1 part by mass of an anti-sagging agent are dropped into 95 parts by mass of acidic silica sol and stirred evenly to obtain Component B.

[0071] Preparation of Component C: 78 parts by mass of trimethylmethoxysilane and 22 parts by mass of trimethylsilanol of commercially available analytical pure grade are added to a stirring tank and stirred evenly to obtain Component C.

[0072] Preparation of coating: A, B and C components are prepared in a ratio of 1:1.5:0.3. First, mix component A and component B, stir and react at 500-800 r / min for 20-30 minutes, then add component C and react for 20-30 minutes. Filter through a 300-mesh filter to obtain the PET film-matched coating.

[0073] Preparation of coating: The PET film material is corona treated on a corona machine to obtain a pre-treated substrate. The PET film matching coating is rolled onto the surface of the substrate, the film thickness is controlled to be about 2μm, and cured at 140℃ for 3min. A long-lasting antistatic and graffiti-resistant PET film coating is obtained.

[0074] The coatings prepared in each embodiment were subjected to relevant performance tests, and the data are summarized in Table 1.

[0075] Table 1 Performance data of the coatings prepared in each embodiment

[0076]

[0077]

[0078] As can be seen from Table 1 above, the more ATO content there is, the better the antistatic effect of the coating is. After reaching a certain amount, there is no change, but the coating will obviously fog, affecting the light transmittance. After long-term storage, the antistatic property of the coating containing a certain amount of ATO does not significantly decay; in the process of preparing the coating, the subsequent hydroxyl end-capping treatment, the fewer hydroxyl groups remain on the surface of the coating, the denser the coating, and the resistance is further improved, making it easy to achieve graffiti resistance, thereby empowering the home decoration field; at the same time, the hydrophilicity of the coating is reduced, and it is not easy to contact with external water and adsorb water molecules, further enhancing the protective function.

[0079] In summary, the preparation method of the long-lasting antistatic home decoration PET film and the coating for the film forms a dense -Si-O-Si- structure through the hydrolysis and condensation of organic silicon monomers, and introduces trimethylalkoxysilane for hydroxyl termination, which further improves the hydrophobic durability of the coating, thereby giving the coating excellent graffiti cleaning performance; at the same time, a wide-bandgap transparent semiconductor material antimony-doped tin oxide (ATO) is introduced, wherein SnO2 is embedded in the gel skeleton of SiO2 by condensation with -Si-OH- to form a three-dimensional network structure of -Sn-O-Si-, wherein a part of Sn 4+ By Sb 3+Substitution is carried out to form a p-type semiconductor, which increases the carrier concentration and thus enables the coating to generate conductivity. Its antistatic effect is more persistent and is not easily affected by wiping and washing. This allows the PET film material to be used without being affected by static adsorption during processes such as production, die-cutting, and winding and unwinding, and it is not easily affected by the adsorption of dust and fluff in the subsequent process, which affects the aesthetics. At the same time, the stain resistance of the home improvement PET film is improved and the difficulty of graffiti removal is reduced.

[0080] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant workers can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A preparation method of a coating for a PET film, characterized in that, It includes the following steps: Mix methyltrialkoxysilane, methylphenyldialkoxysilane, methylvinyldialkoxysilane, vinyltrialkoxysilane, propyltrialkoxysilane, and a catalyst at room temperature with stirring to obtain Component A; Mix an ATO solution and silica sol to obtain ATO-modified silica sol, and then mix it with functional additives at room temperature with stirring to obtain Component B; Mix trimethylalkoxysilane and trimethylsilanol at room temperature with stirring to obtain Component C; Corona treat a PET film to obtain a pretreated substrate; At room temperature, first mix Component A and Component B and react for 20 - 30 min, then add Component C and stir and react for 20 - 30 min, filter, roll coat onto the surface of the pretreated substrate, dry, and cure at 130 - 150 °C to obtain a coating for PET film; Among them, the mass ratio of Component A, Component B, and Component C is 1:1:0.1 - 1:2:0.

4.

2. The preparation method according to claim 1, wherein Component A includes raw materials in the following mass parts: 60 - 80 parts of methyltrialkoxysilane, no more than 10 parts of methylphenyldialkoxysilane, no more than 10 parts of methylvinyldialkoxysilane, no more than 10 parts of vinyltrialkoxysilane, no more than 10 parts of propyltrialkoxysilane, and 0.5 - 3 parts of a catalyst; Component B includes raw materials in the following mass parts: 20 - 30 parts of an ATO solution, 60 - 75 parts of silica sol, and 1.5 - 5.5 parts of functional additives; Component C includes raw materials in the following mass parts: 70 - 80 parts of trimethylalkoxysilane and 20 - 30 parts of trimethylsilanol.

3. The preparation method according to claim 2, wherein In Component A, the methyltrialkoxysilane includes at least one of methyltrimethoxysilane and methyltriethoxysilane; The methylphenyldialkoxysilane includes at least one of methylphenyldimethoxysilane and methylphenyldiethoxysilane; The methylvinyldialkoxysilane includes at least one of methylvinyldimethoxysilane and methylvinyldiethoxysilane; The vinyltrialkoxysilane includes at least one of vinyltrimethoxysilane and vinyltriethoxysilane; The propyltrialkoxysilane includes at least one of propyltrimethoxysilane and propyltriethoxysilane; The catalyst includes a mixed solution of any one or more of formic acid, acetic acid, and citric acid.

4. The preparation method according to claim 2, wherein In Component B, the ATO solution includes the following components in mass parts: 20 - 30 parts of stannous chloride dihydrate, 50 - 60 parts of ethanol, and 10 - 30 parts of antimony trichloride.

5. The preparation method according to claim 2, wherein In Component B, the pH value of the silica sol is 4 - 6, and the particle size is 5 - 50 nm; and In Component B, the functional additives include an antifoaming agent, a wetting and leveling agent, and an anti-sagging agent.

6. The preparation method according to claim 2, wherein In the component C, the trimethylalkoxysilane includes at least one of trimethylmethoxysilane and trimethylethoxysilane.

7. The preparation method according to claim 1, wherein the preparation method of the ATO solution is as follows: Dissolve stannous chloride dihydrate in ethanol, stir at room temperature for 1 h, then add antimony trichloride, and stir in a water bath at no less than 60 °C for 4 h. The liquid obtained after cooling is the ATO solution.

8. The preparation method according to claim 1, wherein the preparation method of the ATO-modified silica sol is as follows: Drop the ATO solution, defoamer, wetting and leveling agent, and anti-sagging agent into the acidic silica sol, stir and disperse in a water bath at no less than 40 °C for 2 h. The liquid obtained after cooling is the ATO-modified silica sol.

9. The preparation method according to claim 1, wherein the mixing and stirring reaction of the component A and the component B specifically includes stirring and reacting at 500-800 r / min for 20-30 min; the duration of adding the component C and stirring and reacting is 20-30 min; and the curing temperature is 130-150 °C, and the curing time is 2-4 min.

10. A long-lasting antistatic home decoration PET film, characterized in that, including: a PET film material and a PET film coating formed on the surface of the PET film material by using the method according to any one of claims 1-9.

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