Conductive touch display polaroid and preparation process thereof

Abstract

The invention provides a conductive touch display polaroid and a preparation process thereof, and belongs to the field of polaroid preparation and the field of display. The preparation process comprises the following steps: preparing the nano chitin; preparing composite conductive paste; preparing an antistatic coating; and preparing the polaroid. The composite conductive slurry forms the circuit on the supporting layer, the circuits on the two sides form the induction circuit with the touch induction function, the conductive layer is obtained, the polaroid with the conductive layer has the conductive touch display function, and due to the fact that the prepared transparent conductive dispersion liquid can keep high transparency, the touch display effect is good. Due to the characteristic, a circuit cannot be seen from the polaroid in the working process of the finished product terminal, and the quality of a display picture is not influenced.

Description

Technical Field

[0001] The present invention relates to the field of polarizer preparation and the field of displays, and particularly relates to a conductive touch display polarizer and a preparation process thereof. Background Art

[0002] The methods for adding a touch function based on the capacitance principle to a flat panel display (such as a liquid crystal display or an organic light emitting display) include: setting a touch screen in front of the flat panel display, or integrating the touch function inside the flat panel display. Among them, integrating the touch function inside the flat panel display will not cause an increase in thickness and is more in line with the development trend of thinner consumer electronic products. However, the current structures for integrating the touch function inside the flat panel display generally lead to problems such as increased manufacturing difficulty and reduced yield.

[0003] A polarizer is one of the indispensable optical components in a flat panel display. It can be expected that integrating the touch function into the polarizer and then attaching this polarizer to the flat panel display can also achieve the purpose of integrating the touch function on the flat panel display, realizing flexible manufacturing of the touch function, and there will be no problems such as increased manufacturing difficulty and reduced yield.

[0004] The basic structure of the existing polarizer includes: polyvinyl alcohol in the middle, two layers of cellulose triacetate, pressure-sensitive adhesive, release film and protective film. The polarizers on the current market do not have touch display functions, and the surface resistance of the polarizer is as high as 10 12 Ω, with poor conductivity and almost no antistatic ability on the surface of the polarizer.

[0005] Therefore, we propose a conductive touch display polarizer with high antistatic ability and a preparation process thereof. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a conductive touch display polarizer and a preparation process thereof.

[0007] A conductive touch display polarizer includes: a protective layer, a polarizing base layer, a conductive layer, a pressure-sensitive adhesive layer and a release layer which are sequentially stacked, and each layer is connected by an adhesive;

[0008] Among them, the polarizing base layer includes polyvinyl alcohol and two layers of cellulose triacetate, with the polyvinyl alcohol located between the two layers of cellulose triacetate. The antistatic protective layer is an antistatic protective film, the pressure-sensitive adhesive layer is a PSA-film, the release layer is a Release-film, the conductive layer uses a cyclic olefin polymer film COP as a support layer, and composite conductive paste forms a circuit on the support layer, and the two circuits on both sides constitute an induction circuit with touch sensing function.

[0009] Furthermore, the composite conductive paste can form a circuit on the support layer by means of embedding, printing, lithography, and etching.

[0010] A preparation process of a conductive touch display polarizer includes the following steps:

[0011] S1: Preparation of nano-chitin

[0012] Prepare chitin into a chitin dispersion solution, then add 2,2,6,6-tetramethylpiperidine oxide, sodium bromide, and NaClO solution for reaction, and finally add ethanol. After the reaction, perform suction filtration and washing, and high-pressure homogenization to obtain a nano-chitin dispersion;

[0013] S2: Preparation of composite conductive paste

[0014] Prepare a transparent conductive dispersion using sodium polystyrene sulfonate solution, 3,4-ethylenedioxythiophene, carbon nanotubes, and nano-chitin dispersion as raw materials, and then mix it with graphene to obtain a composite conductive paste;

[0015] S3: Preparation of antistatic coating

[0016] Prepare a chain-structured antimony tin oxide nanomaterial, then use the chain-structured antimony tin oxide nanomaterial to load silver to obtain a silver-loaded antimony tin oxide dispersion, and then add silicone resin, thickener, dispersant, and defoamer to mix and prepare an antistatic coating;

[0017] S4: Preparation of polarizer

[0018] Stack the antistatic protective layer, polarizing base layer, conductive layer, pressure-sensitive adhesive layer, and release layer in sequence, and connect each layer with an adhesive to obtain a polarizer.

[0019] Furthermore, the preparation of nano-chitin in step S1 specifically includes the following steps:

[0020] S1.1: After drying 40-50 parts by weight of α-chitin, soak it in 100-200 parts by weight of deionized water, and at the same time perform mechanical stirring at 800-1000 r / min for 2-3 h to obtain a chitin dispersion solution;

[0021] S1.2: Add 0.6-0.7 parts by weight of 2,2,6,6-tetramethylpiperidine oxide and 6-7 parts by weight of sodium bromide to the chitin dispersion solution, stir and mix, then add an NaClO solution containing 800-850 mmol, and adjust the pH, and continuously react for 5-6 h to obtain a reaction system;

[0022] S1.3: Add 1 - 2 parts by weight of ethanol to the reaction system to obtain a completed reaction mixture. Vacuum filter the mixture through a 500 - 800 - mesh screen and a Buchner funnel, and wash and filter repeatedly 2 - 3 times. Then, perform high - pressure homogenization 2 - 3 times to obtain a nano - chitin dispersion.

[0023] Further, in step S1.2, adjust the pH to 10 - 10.5.

[0024] Further, the preparation of the composite conductive paste in step S2 specifically includes the following steps:

[0025] S2.1: Add 5 - 8 mmol of hydrogen chloride to 10 - 12 parts by weight of deionized water. Then add 12 - 15 parts by weight of sodium polystyrene sulfonate solution and perform magnetic stirring for 1 - 2 h. Then add 0.13 - 0.15 parts by weight of 3,4 - ethylenedioxythiophene, 1 - 1.5 parts by weight of carbon nanotubes, and 3 - 5 parts by weight of nano - chitin, and stir and mix at room temperature for 3 - 4 h to obtain a nano - chitin composite solution;

[0026] S2.2: Dissolve 0.01 - 0.02 parts by weight of ammonium persulfate in 10 - 12 parts by weight of deionized water, then add it to the nano - chitin composite solution. After stirring and mixing for 45 - 48 h, add 3 - 5 parts by weight of acetic acid, and centrifuge at 9000 - 9500 r / min. Wash the precipitate with ethanol and deionized water 2 - 3 times in sequence, and then perform high - pressure homogenization 2 - 3 times to obtain a transparent conductive dispersion;

[0027] S2.3: Dissolve polyvinylpyrrolidone in N - methylpyrrolidone and perform magnetic stirring and mixing at 50 - 52 °C for 2 - 3 h. Then add 0.5 - 0.6 wt% of graphene and 2 - 3 wt% of the transparent conductive dispersion, then perform ultrasonic dispersion for 2 - 3 h, and then perform magnetic stirring for 1 - 2 h to obtain a composite conductive paste.

[0028] Further, the weight - part ratio of polyvinylpyrrolidone to N - methylpyrrolidone is 2 - 3:5 - 8.

[0029] Further, the preparation of the antistatic coating in step S3 specifically includes the following steps:

[0030] S3.1: Add 4 - 5 parts by weight of metallic tin powder and 2 - 3 parts by weight of antimony trioxide to 100 - 120 parts by weight of deionized water. Then cool down to 0 - 5 °C, add 10 - 12 parts by weight of ethanol, perform mechanical stirring for 1 - 2 h, then add 2 - 3 parts by weight of nitric acid solution, react for 2 - 3 h, then add 3 - 5 parts by weight of hydrogen peroxide and continue to react for 1 - 2 h. Finally, add 1 - 2 parts by weight of ammonia water and react for 10 - 12 h. After the reaction is completed, perform suction filtration and washing to obtain a precursor stannic antimonate gel;

[0031] S3.2: Add 10 - 12 parts by weight of the precursor stannic antimonate gel to 50 - 60 parts by weight of deionized water, ultrasonically treat it with a cell crusher in an ice - water bath for 20 - 30 min, then add ammonia water to adjust the pH to 8 - 9, and then react at 220 - 230 °C for 20 - 24 h. After the reaction is completed, cool it to room temperature, and then perform dialysis washing with distilled water to obtain chain - structured stannic antimonate nanomaterials;

[0032] S3.3: Add 4 - 5 parts by weight of chain - structured stannic antimonate nanomaterials, 4 - 5 parts by weight of BYK - 2155 dispersant, 0.5 - 0.6 parts by weight of BYK - 9076 dispersant, and 300 - 400 parts by weight of ethyl acetate into a ball mill, ball - mill for 48 - 50 h, then centrifuge in a centrifuge at a speed of 8000 - 9000 r / min for 5 - 10 min, and take the supernatant to obtain a stannic antimonate dispersion;

[0033] S3.4: Dissolve 1 - 2 parts by weight of silver nitrate in 15 - 20 parts by weight of deionized water, then adjust the pH to 7 - 8. Slowly add the silver nitrate solution to the stannic antimonate dispersion, stir and mix for 30 - 40 min, then add 2 - 3 parts by weight of sodium citrate, continue to stir for 20 - 30 min. After the reaction is completed, centrifuge in a centrifuge at a speed of 8000 - 9000 r / min for 5 - 10 min, and redisperse the precipitate in deionized water to obtain a silver - loaded stannic antimonate dispersion;

[0034] S3.5: Mix 5 - 8 parts by weight of silicone resin, 10 - 12 parts by weight of silver - loaded stannic antimonate dispersion, 20 - 30 parts by weight of deionized water, 1 - 2 parts by weight of thickener, 1 - 2 parts by weight of polyvinylpyrrolidone, and 1 - 2 parts by weight of polysiloxane, and stir for 20 - 30 min to prepare an antistatic coating.

[0035] Furthermore, the thickener in step S3.5 is polyacrylamide.

[0036] Furthermore, the preparation of the polarizing film in step S4 specifically includes the following steps:

[0037] S4.1: Coat the antistatic coating on the polyester protective film with a wire - bar coater, and after coating, place it in an oven at 80 - 85 °C to dry for 200 - 210 s to obtain an antistatic protective film;

[0038] S4.2: Use a cyclic olefin polymer film COP as a support layer, form a circuit with a conductive paste on the support layer, and the two - side circuits form an induction circuit with touch - sensing function to obtain a conductive layer;

[0039] S4.3: Stack the antistatic protective layer, polarizing base layer, conductive layer, pressure-sensitive adhesive layer, and release layer in sequence, and connect each layer with an adhesive to obtain a polarizer.

[0040] Compared with the prior art, the present invention has at least the following beneficial effects:

[0041] 1. In the present invention, a composite conductive paste is formed into a circuit on a support layer, and the circuits on both sides constitute an induction circuit with touch sensing function to obtain a conductive layer. The polarizer containing the conductive layer has a conductive touch display function. Since the preparation of the transparent conductive dispersion can maintain a high transparency, this characteristic makes the circuit of the polarizer in the working finished terminal invisible and does not affect the quality of the display screen.

[0042] 2. In the present invention, nano-chitin has a linear molecular structure, and the molecular chain contains abundant amino and hydroxyl groups, which has a high affinity with conductive polymers. In addition, a large number of carboxyl groups on the surface of nano-chitin and carbon nanotubes contribute to the adsorption of 3,4-ethylenedioxythiophene monomers. Under the action of sodium polystyrene sulfonate, the 3,4-ethylenedioxythiophene monomers polymerize around nano-chitin to form a polymer surrounding nano-chitin, and a coating structure can be formed on the surface of nano-chitin to form a transparent conductive material with a core-shell structure. Carbon nanotubes have excellent electrical conductivity, and their addition can significantly improve the overall electrical conductivity. The coating structure formed on the surface of nano-chitin also has a certain electrical conductivity. The three interact with each other to form a more continuous and efficient conductive network. This optimized conductive network structure enables electrons to be transmitted more quickly and smoothly, thereby improving the conductivity of the transparent conductive dispersion. Both nano-chitin and the polymer are transparent, and carbon nanotubes are added at the same time, so the prepared transparent conductive dispersion can maintain a high transparency.

[0043] 3. In the present invention, graphene and a transparent conductive dispersion are mixed to prepare a composite conductive paste. When mixed with the transparent conductive dispersion, graphene can intertwine with nano-cellulose, polypyrrole polymer, and carbon nanotubes. Due to the two-dimensional planar structure of graphene, it can form more connection points with other conductive components at the nano-scale, further improving and optimizing the conductive network. And the two-dimensional structure of graphene has a certain degree of flexibility to a certain extent. After being mixed with the transparent conductive dispersion, it can improve the flexibility of the composite conductive paste, so that the prepared polarizer can be used to manufacture a flexible touch display panel.

[0044] 4. The present invention prepares an antistatic coating, and a silver-loaded antimony tin oxide nanomaterial is added to the antistatic coating. The antimony tin oxide nanomaterial in the antistatic coating is a component with good electrical conductivity. After the chain-like antimony tin oxide nanomaterial is loaded with silver, silver can serve as a "high-speed channel" for electron conduction, and electrons can be transferred between silver and antimony tin oxide more easily, enabling static charges to be quickly conducted away, thereby effectively preventing the accumulation of static electricity. The silicone resin in the antistatic coating cooperates with the silver-loaded antimony tin oxide nanomaterial. On the one hand, the silicone resin provides a stable attachment matrix for the silver-loaded antimony tin oxide nanomaterial, and silver can be combined with the silicone resin through chemical bonding or physical adsorption, etc., to ensure the stable position of the silver-loaded antimony tin oxide nanomaterial in the coating, thus maintaining the stability of the conductive path. On the other hand, the silicone resin helps static charges to be conducted and dissipated more easily on the coating surface, thereby effectively improving the antistatic ability of the polarizer. Description of the Drawings

[0045] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the specification, are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0046] Figure 1 It is a process flow diagram of the preparation of a conductive touch display polarizer adopted in the embodiment of the present invention.

[0047] Figure 2 It is a schematic structural diagram of the polarizer disclosed in the present invention.

[0048] Figure 3 It is a schematic structural diagram of the flexible touch display panel manufactured using the polarizer disclosed in the present invention. Detailed Embodiments

[0049] The following describes in detail the preparation process of a conductive touch display polarizer provided by the present invention with reference to the drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0050] Embodiment 1

[0051] A preparation process of a conductive touch display polarizer, as Figure 1 shown, includes the following steps:

[0052] S1: Preparation of nano-chitin

[0053] S1.1: After drying 40 parts by weight of α-chitin, it is soaked in 100 parts by weight of deionized water, and mechanical stirring is carried out at 800 r / min for 2 h to obtain a chitin dispersion solution;

[0054] S1.2: Add 0.6 parts by weight of 2,2,6,6-tetramethylpiperidine oxide and 6 parts by weight of sodium bromide to the chitin dispersion solution. After stirring and mixing, add an NaClO solution containing 800 mmol, and adjust the pH to 10. React continuously for 5 h to obtain a reaction system;

[0055] S1.3: Add 1 part by weight of ethanol to the reaction system to obtain a completed reaction mixture. The mixture is vacuum filtered through a 500-mesh screen and a Buchner funnel, and washed and filtered repeatedly 2 times. Then, it is homogenized under high pressure 2 times to obtain a nano-chitin dispersion;

[0056] S2: Preparation of composite conductive paste

[0057] S2.1: Add 5 mmol of hydrogen chloride to 10 parts by weight of deionized water, then add 12 parts by weight of sodium polystyrene sulfonate solution, and carry out magnetic stirring for 1 h. Then add 0.13 parts by weight of 3,4-ethylenedioxythiophene, 1 part by weight of carbon nanotubes, and 3 parts by weight of nano-chitin, and stir and mix at room temperature for 3 h to obtain a nano-chitin composite solution;

[0058] S2.2: Dissolve 0.01 parts by weight of ammonium persulfate in 10 parts by weight of deionized water, then add it to the nano-chitin composite solution. After stirring and mixing for 45 h, add 3 parts by weight of acetic acid, and centrifuge at 9000 r / min. The precipitate is washed 2 times successively with ethanol and deionized water, and then homogenized under high pressure 2 times to obtain a transparent conductive dispersion;

[0059] S2.3: Dissolve 2 parts by weight of polyvinylpyrrolidone in 5 parts by weight of N-methylpyrrolidone, and carry out magnetic stirring and mixing at 50 °C for 2 h. Then add 0.5 wt% of graphene and 2 wt% of the transparent conductive dispersion, then ultrasonically disperse for 2 h, and then carry out magnetic stirring for 1 h to obtain a composite conductive paste;

[0060] S3: Preparation of antistatic coating

[0061] S3.1: Add 4 parts by weight of metal tin powder and 2 parts by weight of antimony trioxide to 100 parts by weight of deionized water, then cool down to 0 °C, add 10 parts by weight of ethanol, carry out mechanical stirring for 1 h, then add 2 parts by weight of nitric acid solution, react for 2 h, then add 3 parts by weight of hydrogen peroxide and continue to react for 1 h. Finally, add 1 part by weight of ammonia water and react for 10 h. After the reaction is completed, carry out suction filtration and washing to obtain a precursor tin-antimony oxide gel;

[0062] S3.2: Add 10 parts by weight of the precursor stannic antimonate gel to 50 parts by weight of deionized water, ultrasonically treat it with a cell crusher in an ice-water bath for 20 min, then add ammonia water to adjust the pH to 8, and then react at 220 °C for 20 h. After the reaction is completed, cool it to room temperature, and then perform dialysis washing with distilled water to obtain a chain-structured stannic antimonate nanomaterial;

[0063] S3.3: Add 4 parts by weight of the chain-structured stannic antimonate nanomaterial, 4 parts by weight of BYK-2155 dispersant, 0.5 parts by weight of BYK-9076 dispersant, and 300 parts by weight of ethyl acetate to a ball mill, ball mill for 48 h, and then centrifuge in a centrifuge at 8000 r / min for 5 min. Take the supernatant to obtain a stannic antimonate dispersion;

[0064] S3.4: Dissolve 1 part by weight of silver nitrate in 15 parts by weight of deionized water, then adjust the pH to 7. Slowly add the silver nitrate solution to the stannic antimonate dispersion, stir and mix for 30 min, then add 2 parts by weight of sodium citrate, continue to stir for 20 min. After the reaction is completed, centrifuge in a centrifuge at 8000 r / min for 5 min, and redisperse the precipitate in deionized water to obtain a silver-loaded stannic antimonate dispersion;

[0065] S3.5: Mix 5 parts by weight of silicone resin, 10 parts by weight of the silver-loaded stannic antimonate dispersion, 20 parts by weight of deionized water, 1 part by weight of polyacrylamide, 1 part by weight of polyvinylpyrrolidone, and 1 part by weight of polysiloxane, and stir for 20 min to prepare an antistatic coating;

[0066] S4: Preparation of polarizer

[0067] S4.1: Coat the antistatic coating on a polyester protective film with a wire bar coater. After coating, place it in an oven at 80 °C and dry for 200 s to obtain an antistatic protective film;

[0068] S4.2: Use a cyclic olefin polymer film COP as a support layer, and print a conductive paste on the support layer to form a circuit. The two-sided circuits form an induction circuit with touch sensing function to obtain a conductive layer;

[0069] S4.3: Stack the protective layer, polarizing base layer, conductive layer, pressure-sensitive adhesive layer, and release layer in sequence, and connect each layer with an adhesive to obtain a polarizer, whose structure is as Figure 2 shown.

[0070] Among them, the polarizing base layer includes polyvinyl alcohol and two layers of cellulose triacetate. The polyvinyl alcohol is located between the two layers of cellulose triacetate. The protective layer is the antistatic protective film, the pressure-sensitive adhesive layer is PSA-film, the release layer is Release-film, and the adhesive is an optically transparent adhesive.

[0071] Example 2

[0072] A preparation process of a conductive touch - display polarizer is as follows Figure 1 shown, including the following steps:

[0073] S1: Preparation of nano - chitin

[0074] S1.1: After drying 50 parts by weight of α - chitin, it is soaked in 200 parts by weight of deionized water, and at the same time, mechanical stirring is carried out at 800 r / min for 2 - 3 h to obtain a chitin dispersion solution;

[0075] S1.2: 0.7 part by weight of 2,2,6,6 - tetramethylpiperidine - 1 - oxide and 7 parts by weight of sodium bromide are added to the chitin dispersion solution. After stirring and mixing, an NaClO solution containing 850 mmol is added, and the pH is adjusted to 10.5, and the reaction continues for 5 h to obtain a reaction system;

[0076] S1.3: 2 parts by weight of ethanol is added to the reaction system to obtain a completed reaction mixture. The mixture is vacuum - filtered through a 500 - mesh screen and a Buchner funnel, washed and filtered repeatedly 2 times, and then subjected to high - pressure homogenization 2 times to obtain a nano - chitin dispersion;

[0077] S2: Preparation of composite conductive paste

[0078] S2.1: 8 mmol of hydrogen chloride is added to 12 parts by weight of deionized water, and then 15 parts by weight of sodium polystyrene sulfonate solution is added, and magnetic stirring is carried out for 1 h. Then 0.15 part by weight of 3,4 - ethylenedioxythiophene, 1.5 parts by weight of carbon nanotubes, and 5 parts by weight of nano - chitin are added, and stirring and mixing are carried out at room temperature for 3 h to obtain a nano - chitin composite solution;

[0079] S2.2: 0.02 part by weight of ammonium persulfate is dissolved in 12 parts by weight of deionized water, and then added to the nano - chitin composite solution. After stirring and mixing for 45 h, 3 - 5 parts by weight of acetic acid is added, and centrifugation is carried out at 90000 r / min. The precipitate is washed 2 times successively with ethanol and deionized water, and then subjected to high - pressure homogenization 2 times to obtain a transparent conductive dispersion;

[0080] S2.3: 3 parts by weight of polyvinylpyrrolidone is dissolved in 8 parts by weight of N - methylpyrrolidone, and magnetic stirring and mixing are carried out at 50 °C for 2 h. Then 0.6 wt% of graphene and 3 wt% of the transparent conductive dispersion are added, followed by ultrasonic dispersion for 2 h and then magnetic stirring for 1 h to obtain a composite conductive paste;

[0081] S3: Preparation of antistatic coating

[0082] S3.1: Add 5 parts by weight of metallic tin powder and 3 parts by weight of antimony trioxide to 120 parts by weight of deionized water. Then cool down the mixture, and when the temperature reaches 0 °C, add 12 parts by weight of ethanol. Stir mechanically for 2 h, then add 3 parts by weight of nitric acid solution and react for 2 h. Next, add 5 parts by weight of hydrogen peroxide and continue to react for 1 h. Finally, add 2 parts by weight of ammonia water and react for 10 h. After the reaction is completed, perform suction filtration and washing to obtain the precursor stannic antimonous oxide gel.

[0083] S3.2: Add 12 parts by weight of the precursor stannic antimonous oxide gel to 60 parts by weight of deionized water. Under an ice-water bath, ultrasonically treat with a cell crusher for 20 min, then add ammonia water to adjust the pH to 9. Then react at 220 °C for 20 h. After the reaction is completed, cool to room temperature and then perform dialysis washing with distilled water to obtain the chain-structured stannic antimonous oxide nanomaterial.

[0084] S3.3: Add 5 parts by weight of the chain-structured stannic antimonous oxide nanomaterial, 5 parts by weight of BYK-2155 dispersant, 0.6 parts by weight of BYK-9076 dispersant, and 400 parts by weight of ethyl acetate to a ball mill kettle, and ball mill for 48 h. Then centrifuge in a centrifuge at a rotation speed of 8000 r / min for 5 min, and take the supernatant to obtain the stannic antimonous oxide dispersion.

[0085] S3.4: Dissolve 2 parts by weight of silver nitrate in 20 parts by weight of deionized water, then adjust the pH to 8. Slowly add the silver nitrate solution to the stannic antimonous oxide dispersion, stir and mix for 30 min, then add 3 parts by weight of sodium citrate and continue to stir for 20 min. After the reaction ends, centrifuge in a centrifuge at a rotation speed of 8000 r / min for 5 min, and redisperse the precipitate in deionized water to obtain the silver-loaded stannic antimonous oxide dispersion.

[0086] S3.5: Mix 8 parts by weight of organosilicon resin, 12 parts by weight of the silver-loaded stannic antimonous oxide dispersion, 30 parts by weight of deionized water, 2 parts by weight of polyacrylamide, 2 parts by weight of polyvinylpyrrolidone, and 2 parts by weight of polysiloxane, and stir for 20 min to prepare the antistatic coating.

[0087] S4: Preparation of the polarizer

[0088] S4.1: Coat the antistatic coating on the polyester protective film with a wire bar coater. After coating, place it in an oven at 80 °C and dry for 200 s to obtain the antistatic protective film.

[0089] S4.2: Use the cyclic olefin polymer film COP as the support layer, and print the conductive paste on the support layer to form a circuit. The two-sided circuits form an induction circuit with touch sensing function to obtain the conductive layer.

[0090] S4.3: Stack the protective layer, polarizing base layer, conductive layer, pressure-sensitive adhesive layer, and release layer in sequence, and connect each layer with an adhesive to obtain a polarizer, the structure of which is as Figure 2 shown.

[0091] Among them, the polarizing base layer includes polyvinyl alcohol and two layers of cellulose triacetate. The polyvinyl alcohol is located between the two layers of cellulose triacetate. The protective layer is an antistatic protective film, the pressure-sensitive adhesive layer is a PSA-film, the release layer is a Release-film, and the adhesive is an optically clear adhesive.

[0092] Example 3

[0093] A preparation process of a conductive touch display polarizer, as Figure 1 shown, includes the following steps:

[0094] S1: Preparation of nano-chitin

[0095] S1.1: After drying 40 parts by weight of α-chitin, soak it in 100 parts by weight of deionized water, and at the same time carry out mechanical stirring at 1000 r / min for 3 h to obtain a chitin dispersion solution;

[0096] S1.2: Add 0.6 parts by weight of 2,2,6,6-tetramethylpiperidine oxide and 6 parts by weight of sodium bromide to the chitin dispersion solution. After stirring and mixing, add an NaClO solution containing 800 mmol, and adjust the pH to 10, and continue to react for 6 h to obtain a reaction system;

[0097] S1.3: Add 1 part by weight of ethanol to the reaction system to obtain a completed reaction mixture. Vacuum filter the mixture with an 800-mesh screen and a Buchner funnel, and wash and filter it repeatedly 3 times, and then carry out high-pressure homogenization 3 times to obtain a nano-chitin dispersion;

[0098] S2: Preparation of composite conductive paste

[0099] S2.1: Add 5 mmol of hydrogen chloride to 10 parts by weight of deionized water, then add 12 parts by weight of sodium polystyrene sulfonate solution, and carry out magnetic stirring for 2 h. Then add 0.13 parts by weight of 3,4-ethylenedioxythiophene, 1 part by weight of carbon nanotubes, and 3 parts by weight of nano-chitin, and stir and mix at room temperature for 4 h to obtain a nano-chitin composite solution;

[0100] S2.2: Dissolve 0.01 parts by weight of ammonium persulfate in 10 parts by weight of deionized water, then add it to the nano-chitin composite solution. After stirring and mixing for 48 h, add 3 parts by weight of acetic acid, and centrifuge at 9500 r / min. Wash the precipitate with ethanol and deionized water 3 times in sequence, and then carry out high-pressure homogenization 3 times to obtain a transparent conductive dispersion;

[0101] S2.3: Dissolve 2 parts by weight of polyvinylpyrrolidone in 5 parts by weight of N-methylpyrrolidone, and magnetically stir and mix for 3 h at 52 °C. Then add 0.5 wt% of graphene and 2 wt% of transparent conductive dispersion, and then ultrasonically disperse for 3 h and magnetically stir for another 2 h to obtain a composite conductive paste;

[0102] S3: Preparation of antistatic coating

[0103] S3.1: Add 4 parts by weight of metallic tin powder and 2 parts by weight of antimony trioxide to 100 parts by weight of deionized water, then cool down to 5 °C, add 10 parts by weight of ethanol, mechanically stir for 2 h, then add 2 parts by weight of nitric acid solution, react for 3 h, then add 3 parts by weight of hydrogen peroxide and continue to react for 2 h, and finally add 1 part by weight of ammonia water and react for 12 h. After the reaction is completed, perform suction filtration and washing to obtain a precursor stannic antimonate gel;

[0104] S3.2: Add 10 parts by weight of the precursor stannic antimonate gel to 50 parts by weight of deionized water, ultrasonically treat with a cell crusher in an ice-water bath for 30 min, then add ammonia water to adjust the pH to 8, and then react at 230 °C for 24 h. After the reaction is completed, cool to room temperature and then perform dialysis washing with distilled water to obtain a chain-structured stannic antimonate nanomaterial;

[0105] S3.3: Add 4 parts by weight of the chain-structured stannic antimonate nanomaterial, 4 parts by weight of BYK-2155 dispersant, 0.5 part by weight of BYK-9076 dispersant, and 300 parts by weight of ethyl acetate to a ball mill, ball mill for 50 h, and then centrifuge at 9000 r / min for 10 min in a centrifuge, and take the supernatant to obtain a stannic antimonate dispersion;

[0106] S3.4: Dissolve 1 part by weight of silver nitrate in 15 parts by weight of deionized water, then adjust the pH to 7, slowly add the silver nitrate solution to the stannic antimonate dispersion, stir and mix for 40 min, then add 2 parts by weight of sodium citrate, continue to stir for 30 min. After the reaction is completed, centrifuge at 8000 r / min for 10 min in a centrifuge, and redisperse the precipitate in deionized water to obtain a silver-loaded stannic antimonate dispersion;

[0107] S3.5: Mix 5 parts by weight of silicone resin, 10 parts by weight of the silver-loaded stannic antimonate dispersion, 20 parts by weight of deionized water, 1 part by weight of polyacrylamide, 1 part by weight of polyvinylpyrrolidone, and 1 part by weight of polysiloxane, and stir for 30 min to prepare an antistatic coating;

[0108] S4: Preparation of polarizer

[0109] S4.1: Coat the antistatic coating on the polyester protective film using a wire bar coater. After coating, place it in an oven at 85 °C and dry for 210 s to obtain an antistatic protective film;

[0110] S4.2: Use the cyclic olefin polymer film COP as the support layer. Compound the conductive paste on the support layer and form a circuit through etching. The two-sided circuits form an induction circuit with touch sensing function to obtain a conductive layer;

[0111] S4.3: Stack the protective layer, polarizing base layer, conductive layer, pressure-sensitive adhesive layer, and release layer in sequence. Connect each layer with an adhesive to obtain a polarizer, and its structure is as Figure 2 shown.

[0112] Among them, the polarizing base layer includes polyvinyl alcohol and two layers of cellulose triacetate. The polyvinyl alcohol is located between the two layers of cellulose triacetate. The protective layer is the antistatic protective film, the pressure-sensitive adhesive layer is PSA-film, the release layer is Release-film, and the adhesive is optically clear adhesive.

[0113] Perform visible light transmittance test and bending test on the polarizers prepared in Examples 1 - 3. Set the parameters of the bending machine for the bending test: select the bending angles of plus and minus 45°, the bending rate is 1 time / s, and conduct 200,000 bending detections. Observe the appearance after bending, and the test results are referred to Table 1.

[0114] Table 1. Visible light transmittance and bending measurement results of Examples 1 - 3

[0115] Permeability (%) Bending test Example 1 85 No obvious appearance defects Example 2 84 No obvious appearance defects Example 3 85 No obvious appearance defects

[0116] It can be seen from the data in Table 1 that the polarizers prepared by the present invention can maintain a high transparency and have a certain flexibility, and can be used to manufacture flexible touch display panels, and the results are as Figure 3 shown.

[0117] Comparative Example 1

[0118] Compared with Example 1, the difference in Comparative Example 1 is that in Comparative Example 1, the carbon nanotubes in S2.1 are removed, and the other steps remain unchanged to prepare a polarizer, denoted as Comparative Example 1.

[0119] Comparative Example 2

[0120] Compared with Example 1, the difference in Comparative Example 2 is that in Comparative Example 2, Steps S1 and S2.1 - 2.2 are removed, and the transparent conductive dispersion liquid in Step S2.3 is replaced with an equal weight portion of carbon nanotubes, and the other steps remain unchanged to prepare a polarizer, denoted as Comparative Example 2.

[0121] Comparative Example 3

[0122] Compared with Example 1, the difference in Comparative Example 3 is that Comparative Example 3 removes step S2.3, replaces the composite conductive paste in step S4.2 with an equal weight portion of transparent conductive dispersion, and the remaining steps remain unchanged to prepare a polarizing plate, denoted as Comparative Example 3.

[0123] Comparative Example 4

[0124] Compared with Example 1, the difference in Comparative Example 4 is that Comparative Example 4 removes steps S2.1 - S2.2, replaces the transparent conductive dispersion in S2.3 with 1 part by weight of carbon nanotubes and 3 parts by weight of nanochitin, and the remaining steps remain unchanged to prepare a polarizing plate, denoted as Comparative Example 4.

[0125] The composite conductive pastes prepared in Examples 1 - 3 and Comparative Examples 1 - 2, 4 and the transparent conductive dispersion prepared in Comparative Example 3 were filtered into films using a vacuum filter, dried, to obtain conductive films, and the conductivity of the conductive films was measured by the four - point probe method. The measurement results are shown in Table 2.

[0126] Table 2. Conductivity measurement results of Examples 1 - 3 and Comparative Examples

[0127] Conductivity (S / cm) Example 1 10.8 Example 2 10.3 Example 3 10.5 Comparative example 1 8.1 Comparative example 2 7.6 Comparative example 3 8.7 Comparative example 4 6.5

[0128] It can be seen from the data in Table 2 that the conductivities of Comparative Example 2 and Comparative Example 4 are both lower than those of the Examples, and Comparative Example 4 is lower than Comparative Example 2. This shows that 3,4 - ethylenedioxythiophene monomers polymerize around nanochitin under the action of sodium polystyrene sulfonate to form a polymer around nanochitin, which can improve the conductivity of the transparent conductive dispersion. The conductivity of Comparative Example 1 is lower than that of the Example, indicating that adding carbon nanotubes can also improve the conductivity of the transparent conductive dispersion, and the addition of carbon nanotubes promotes the adsorption of 3,4 - ethylenedioxythiophene monomers at the same time, facilitating the formation of polymers, thus significantly improving the overall conductive performance. It can be seen from the data of Comparative Example 3 that the composite conductive paste prepared by mixing graphene and transparent conductive dispersion can further improve the conductivity.

[0129] Comparative Example 5

[0130] Compared with Example 1, the difference in Comparative Example 5 is that Comparative Example 5 removes step S3.4, replaces the silver - loaded antimony tin oxide dispersion in S3.5 with an equal weight portion of antimony tin oxide dispersion, and the remaining steps remain unchanged to prepare a polarizing plate, denoted as Comparative Example 5.

[0131] Comparative Example 6

[0132] Compared with Example 1, the difference in Comparative Example 6 is that Comparative Example 6 removes steps S3.1 - S3.4, replaces the silver - loaded antimony tin oxide dispersion in S3.5 with an equal weight portion of silver dispersion, and the remaining steps remain unchanged to prepare a polarizing plate, denoted as Comparative Example 6.

[0133] The antistatic properties of the antistatic protective films prepared in Examples 1-3 and Comparative Examples 5-6 were tested. The resistance of the antistatic protective films was measured using a surface resistance tester (MCP-400), and the test results are shown in Table 3.

[0134] Table 3. Antistatic test results of Examples 1-3 and Comparative Examples 5-6

[0135] Resistance (Ω / sq) Example 1 <![CDATA[8.89×10 8 > Example 2 <![CDATA[9.23×10 8 > Example 3 <![CDATA[8.97×10 8 > Comparative example 5 <![CDATA[2.12×10 10 > Comparative example 6 <![CDATA[5.89×10 10 >

[0136] As can be seen from the data in Table 3, after removing the silver loading, the resistance increases. This is because the loading structure can form more conductive contact points and conductive paths, enabling electrons to be transmitted more smoothly in the material, thus reducing the resistance. When only the antimony tin oxide dispersion is present, there is no such connection and auxiliary conductive effect of silver in its microstructure, resulting in fewer conductive paths and an increase in resistance. Moreover, the uniformity of the dispersion of antimony tin oxide nanoparticles in the silicone resin decreases, leading to unstable conductive paths. When silver is directly added, the silver in the silver dispersion will agglomerate, also causing discontinuous conductive paths and thus increasing the resistance. Therefore, adding the silver-loaded antimony tin oxide nanoparticles to the antistatic coating can improve the antistatic performance of the antistatic protective film.

[0137] The above examples are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above examples without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A conductive touch display polarizer, characterized in that, The polarizer includes: a protective layer, a polarizing base layer, a conductive layer, a pressure-sensitive adhesive layer, and a release layer that are sequentially stacked, and each layer is connected by an adhesive; Among them, the polarizing base layer includes polyvinyl alcohol and two layers of cellulose triacetate. The polyvinyl alcohol is located between the two layers of cellulose triacetate. The protective layer is an antistatic protective film, the pressure-sensitive adhesive layer is a PSA-film, the release layer is a Release-film, and the conductive layer uses a cyclic olefin polymer film COP as a support layer, and a composite conductive paste forms a circuit on the support layer, and the circuits on both sides form an induction circuit with touch sensing function.

2. A conductive touch display polarizer according to claim 1, characterized in that, The composite conductive paste forms a circuit on the support layer by means of embedding, printing, printing, and etching.

3. The preparation process of a touch display polarizer with conductivity according to claim 1, characterized in that, It includes the following steps: S1: Preparation of nano-chitin Prepare chitin into a chitin dispersion solution, then add 2,2,6,6-tetramethylpiperidine oxide, sodium bromide and NaClO solution to react, and finally add ethanol. After the reaction, perform suction filtration and washing, and high-pressure homogenization to obtain a nano-chitin dispersion; S2: Preparation of composite conductive paste Use sodium polystyrene sulfonate solution, 3,4-ethylenedioxythiophene, carbon nanotubes and nano-chitin dispersion as raw materials to prepare a transparent conductive dispersion, and then mix it with graphene to obtain a composite conductive paste; S3: Preparation of antistatic coating Prepare a chain-structured antimony tin oxide nanomaterial, then use the chain-structured antimony tin oxide nanomaterial to load silver to obtain a silver-loaded antimony tin oxide dispersion, and then add silicone resin, thickener, dispersant, and defoamer to mix and prepare an antistatic coating; S4: Preparation of polarizer Stack the antistatic protective layer, polarizing base layer, conductive layer, pressure-sensitive adhesive layer, and release layer in sequence, and connect each layer with an adhesive to obtain a polarizer.

4. The preparation process of a touch display polarizer with conductivity according to claim 3, characterized in that, The preparation of nano-chitin in step S1 specifically includes the following steps: S1.1: After drying 40-50 parts by weight of α-chitin, soak it in 100-200 parts by weight of deionized water, and at the same time perform mechanical stirring at 800-1000 r / min for 2-3 h to obtain a chitin dispersion solution; S1.2: Add 0.6-0.7 parts by weight of 2,2,6,6-tetramethylpiperidine oxide and 6-7 parts by weight of sodium bromide to the chitin dispersion solution, stir and mix, then add a NaClO solution containing 800-850 mmol, and adjust the pH, and continue to react for 5-6 h to obtain a reaction system; S1.3: Add 1-2 parts by weight of ethanol to the reaction system to obtain a completed reaction mixture. Vacuum filter the mixture with a 500-800 mesh screen and a Buchner funnel, and repeatedly wash and filter 2-3 times, and then perform high-pressure homogenization 2-3 times to obtain a nano-chitin dispersion.

5. The preparation process of a touch display polarizer with conductivity according to claim 4, characterized in that, In step S1.2, the pH is adjusted to 10-10.

5.

6. The preparation process of a touch display polarizer with conductivity according to claim 4, characterized in that, The preparation of the composite conductive paste in step S2 specifically includes the following steps: S2.1: Add 5 - 8 mmol of hydrogen chloride to 10 - 12 parts by weight of deionized water. Then add 12 - 15 parts by weight of sodium polystyrene sulfonate solution and stir magnetically for 1 - 2 h. After that, add 0.13 - 0.15 parts by weight of 3,4 - ethylenedioxythiophene, 1 - 1.5 parts by weight of carbon nanotubes, and 3 - 5 parts by weight of nano - chitin, and stir - mix at room temperature for 3 - 4 h to obtain a nano - chitin composite solution; S2.2: Dissolve 0.01 - 0.02 parts by weight of ammonium persulfate in 10 - 12 parts by weight of deionized water, then add it to the nano - chitin composite solution. After stirring and mixing for 45 - 48 h, add 3 - 5 parts by weight of acetic acid, and centrifuge at 9000 - 9500 r / min. Wash the precipitate with ethanol and deionized water 2 - 3 times in sequence, and then perform high - pressure homogenization 2 - 3 times to obtain a transparent conductive dispersion; S2.3: Dissolve polyvinylpyrrolidone in N - methylpyrrolidone and stir - mix magnetically at 50 - 52 °C for 2 - 3 h. Then add 0.5 - 0.6 wt% of graphene and 2 - 3 wt% of the transparent conductive dispersion, followed by ultrasonic dispersion for 2 - 3 h and then magnetic stirring for 1 - 2 h to obtain a composite conductive paste.

7. The preparation process of a touch display polarizer with conductivity according to claim 6, characterized in that, In step S2.3, the weight - part ratio of polyvinylpyrrolidone to N - methylpyrrolidone is 2 - 3:5 - 8.

8. The preparation process of a touch display polarizer with conductivity according to claim 6, characterized in that, Step S3: Preparation of the antistatic coating, specifically including the following steps: S3.1: Add 4 - 5 parts by weight of metallic tin powder and 2 - 3 parts by weight of antimony trioxide to 100 - 120 parts by weight of deionized water. Then cool down to 0 - 5 °C, add 10 - 12 parts by weight of ethanol, stir mechanically for 1 - 2 h, then add 2 - 3 parts by weight of nitric acid solution, react for 2 - 3 h, add 3 - 5 parts by weight of hydrogen peroxide and continue to react for 1 - 2 h. Finally, add 1 - 2 parts by weight of ammonia water and react for 10 - 12 h. After the reaction is completed, perform suction filtration and washing to obtain a precursor stannic antimonate gel; S3.2: Add 10 - 12 parts by weight of the precursor stannic antimonate gel to 50 - 60 parts by weight of deionized water, ultrasonically treat it with a cell disruptor in an ice - water bath for 20 - 30 min, then add ammonia water to adjust the pH to 8 - 9, and then react at 220 - 230 °C for 20 - 24 h. After the reaction is completed, cool to room temperature and then perform dialysis washing with distilled water to obtain a chain - structured stannic antimonate nanomaterial; S3.3: Add 4 - 5 parts by weight of the chain - structured stannic antimonate nanomaterial, 4 - 5 parts by weight of BYK - 2155 dispersant, 0.5 - 0.6 parts by weight of BYK - 9076 dispersant, and 300 - 400 parts by weight of ethyl acetate into a ball mill kettle, ball - mill for 48 - 50 h, then centrifuge in a centrifuge at a speed of 8000 - 9000 r / min for 5 - 10 min, and take the supernatant to obtain a stannic antimonate dispersion; S3.4: Dissolve 1 - 2 parts by weight of silver nitrate in 15 - 20 parts by weight of deionized water, then adjust the pH to 7 - 8. Slowly add the silver nitrate solution to the antimony tin oxide dispersion, stir and mix for 30 - 40 min. Then add 2 - 3 parts by weight of sodium citrate and continue to stir for 20 - 30 min. After the reaction is completed, centrifuge at 8000 - 9000 r / min in a centrifuge for 5 - 10 min. Redisperse the precipitate in deionized water to obtain a silver-loaded antimony tin oxide dispersion; S3.5: Mix 5 - 8 parts by weight of silicone resin, 10 - 12 parts by weight of silver-loaded antimony tin oxide dispersion, 20 - 30 parts by weight of deionized water, 1 - 2 parts by weight of thickener, 1 - 2 parts by weight of polyvinylpyrrolidone, and 1 - 2 parts by weight of polysiloxane, and stir for 20 - 30 min to prepare an antistatic coating.

9. The preparation process of a touch display polarizer with conductivity according to claim 8, characterized in that, The thickener in step S3.5 is polyacrylamide.

10. The preparation process of a touch display polarizer with conductivity according to claim 8, characterized in that, Step S4 Preparation of the polarizer, specifically includes the following steps: S4.1: Coat the antistatic coating on the polyester protective film with a wire bar coater. After coating, place it in an oven at 80 - 85 °C and dry for 200 - 210 s to obtain an antistatic protective film; S4.2: Use the cyclic olefin polymer film COP as the support layer, and form a circuit by laminating a conductive paste on the support layer. The two circuits on both sides form an induction circuit with touch sensing function to obtain a conductive layer; S4.3: Stack the antistatic protective layer, polarizing base layer, conductive layer, pressure-sensitive adhesive layer and release layer in sequence, and connect each layer with an adhesive to obtain a polarizer.

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