CN112339361B - Resistance type touch screen used in severe environment - Google Patents

Resistance type touch screen used in severe environment Download PDF

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CN112339361B
CN112339361B CN202011184072.8A CN202011184072A CN112339361B CN 112339361 B CN112339361 B CN 112339361B CN 202011184072 A CN202011184072 A CN 202011184072A CN 112339361 B CN112339361 B CN 112339361B
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ito
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film
touch screen
coupling agent
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CN112339361A (en
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夏显忠
潘旭亮
王琳华
彭定云
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Hunan Aerospace Jiecheng Electronic Equipment Co ltd
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Hunan Aerospace Jiecheng Electronic Equipment Co ltd
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    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
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Abstract

The invention provides a resistance type touch screen used in a severe environment, which is structurally divided into 5 layers, namely an AR anti-reflection film, a conductive shielding film, an ITO upper electrode film, ITO lower electrode glass and a heating film from outside to inside. The resistance type touch screen improves the electric conduction and electromagnetic shielding performance of the ITO upper electrode film and the ITO lower electrode glass by adding the modified ITO material, has good mechanical property, optical property, heat-insulating property and heat resistance after further modification, obtains the resistance film through the 5-layer structure, has the application of shielding strong electromagnetic interference, resisting low temperature, resisting strong light and the like in severe environment, and has wide application prospect.

Description

Resistance type touch screen used in severe environment
Technical Field
The invention relates to the field of display and control peripheral application, in particular to a resistance type touch screen used in a severe environment.
Background
Touch screen (touch screen), also known as touch screen or touch panel, is an inductive liquid crystal display device capable of receiving input signals such as touch, when touching graphic buttons on the screen, the touch feedback system on the screen can drive various connecting devices according to pre-programmed programs, and can be used to replace mechanical button panels and produce vivid video and audio effects by means of liquid crystal display pictures. As a latest computer input device, the touch screen is the simplest, convenient and natural man-machine interaction mode at present. The multimedia interactive device gives the multimedia a brand-new appearance and is a brand-new multimedia interactive device with great attractiveness. The method is mainly applied to inquiry of public information, leadership office, industrial control, military command, electronic games, song and dish ordering, multimedia teaching, real estate pre-sale and the like.
At present, a touch screen is used as a visual and effective man-machine interaction device, and is usually used in combination with a display function, so that the requirement of display and control integration of a user is met. Many special devices need to meet various severe working environments, and the temperature, strong light reflection and electromagnetic compatibility are all key factors influencing the use of the touch screen. The application of the equipment using the common touch screen in the use environments of strong electromagnetic interference, low temperature, strong light and the like is not always required. Therefore, it is necessary to develop a touch screen for use in a severe environment to meet the demand.
Disclosure of Invention
The invention aims to provide a resistance type touch screen used in severe environment, which improves the conductivity and electromagnetic shielding performance of an ITO upper electrode film and ITO lower electrode glass by adding a modified ITO material, has good mechanical property, optical property, heat-insulating property and heat-resisting property after further modification, obtains a resistance film through a 5-layer structure, has the application of shielding strong electromagnetic interference, resisting low temperature, resisting strong light and the like in severe environment and has wide application prospect.
The technical scheme of the invention is realized as follows:
the invention provides a resistance-type touch screen used in a severe environment, which is structurally divided into 5 layers, namely an AR antireflection film, a conductive shielding film, an ITO upper electrode film, ITO lower electrode glass 4 and a heating film from outside to inside, wherein ITO modified materials and doped tin dioxide are added into the ITO upper electrode film and the ITO lower electrode glass.
As a further improvement of the invention, the addition amount of the ITO modified material on the ITO upper electrode film is 0.1-10 wt%; the addition amount of the ITO modified material in the ITO lower electrode glass is 0.1-15wt%, and the addition amount of the doped tin dioxide in the ITO upper electrode film and the ITO lower electrode glass is 0.05-0.15 wt%.
As a further improvement of the invention, the ITO modified material is prepared from the following raw materials in parts by weight: 50-100 parts of nano ITO, 200-500 parts of dispersion medium, 5-10 parts of halloysite nanotube, 10-40 parts of PEG2000, 1-2 parts of coupling agent, 0.5-1.5 parts of nicotinamide, 1.2-2 parts of iron oxide and 0.1-0.2 part of oleic acid.
As a further improvement of the invention, the ITO modified material is prepared from the following raw materials in parts by weight: 70 parts of nano ITO, 350 parts of dispersion medium, 7 parts of halloysite nanotube, 25 parts of PEG2000, 1.5 parts of coupling agent, 1 part of nicotinamide, 1.6 parts of iron oxide and 0.15 part of oleic acid.
As a further improvement of the invention, the ITO modified material is prepared by the following method:
s1, ball-milling a halloysite nanotube to 1000-2000 meshes, and drying to obtain powder;
s2, weighing nanometer ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a coupling agent, heating to 60-80 ℃, reacting for 0.5-1h, adding nicotinamide, iron oxide and oleic acid, performing ball milling for 6-10h, performing ultrasonic dispersion for 30-50min, adding the powder obtained in the step S1, heating to 70-90 ℃, reacting for 1-2h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
As a further improvement of the invention, the coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: (0.5-1).
As a further improvement of the invention, the dispersion medium is one or a mixture of ethanol, acetone, dichloromethane, ethyl acetate and water.
As a further improvement of the invention, the preparation method of the doped tin dioxide comprises the following steps: weighing Mo (NO)3)3·5H2O and SnCl4·5H2Adding O, adding into absolute ethyl alcohol, ultrasonically stirring until completely dissolving, adjusting reaction temperature to 40-70 ℃, dropwise adding into the transparent solution at uniform speed by using 20-25v/v% ammonia water as a precipitator, adjusting system pH to 2-3, continuously stirring until complete precipitation, aging for 2h, filtering, washing with 15-25v/v% ethanol solution, and washing with absolute ethyl alcohol until no Cl is detected-So as to obtain the wet gel doped with the tin dioxide, drying the obtained gel at 70-80 ℃, grinding the gel into powder, calcining the powder in a program temperature controller at 1000-1200 ℃ for 1-3h, and grinding the powder to be below 100 meshes to obtain the doped tin dioxide.
As a further improvement of the invention, 0.1-1wt% of graphene and 0.5-1wt% of nicotinamide are added into the conductive shielding film.
As a further improvement of the present invention, the graphene is replaced by modified graphene, and the modified graphene is prepared by the following method:
s1, preparing graphene oxide by adopting a Hummers method;
s2, dissolving 4-5 parts by weight of graphene oxide in 50 parts by weight of deionized water, performing ultrasonic treatment for 10-30min to form a uniform dispersion liquid, adding 1mol/L HCl, and adjusting the pH value to 1-2; then stirring at room temperature, slowly dropwise adding 5-10 parts of silane coupling agent KH550, reacting for 10-12h to obtain modified graphene oxide, washing with absolute ethanol and deionized water to neutrality, finally drying in a vacuum drying oven at 60 ℃ for 48h, and storing for later use;
s3, dissolving 4-5 parts by weight of modified graphene in 50 parts by weight of deionized water, performing ultrasonic treatment for 10-30min to form a uniform dispersion liquid, adding 1-2 parts by weight of hydrazine hydrate at 90-100 ℃ to reduce for 10-12h to obtain the modified graphene, washing the modified graphene to be neutral by absolute ethyl alcohol and deionized water, and drying the modified graphene for later use.
A working principle of a resistive touch screen used in a severe environment is as follows:
1. low temperature heating
The lower limit of the working temperature of the touch screen is usually about-10 ℃, and the surface of the touch screen can generate serious frosting and operation failure at-40 ℃, so that the normal use of the touch function is seriously influenced. In order to ensure that the touch function can normally work at low temperature, the heating film is adopted on the bottom layer to be electrified and heated to carry out heat compensation on the bottom layer, and the surface frosting is removed.
The heating film is a transparent conductive film, and the material of the conductive film has a resistance value and is electrically connected to the power supply device by leads at both ends. When current is applied to the two ends of the heating film, the process that the current continuously passes through the resistor realizes the conversion of electric energy and heat energy.
The heat generation formula: qHeat generation amount＝IConducting current 2*RHeating resistor*THeating time
Therefore, the touch screen and the using equipment of the touch screen can be heated to reach the working temperature through the heating effect of the heating film.
2. Strong light antireflection
According to the use requirement, the touch screen can be applied to the outer side of the display device under the normal condition, and the light rays passing through the display picture pass through the touch screen to realize the display and control integrated design with the touch function. As such, the touch screen needs to have better light transmittance and anti-emission properties.
The outermost layer of the touch screen is made of an AR antireflection coating material, an AR antireflection film with a low refractive index is designed, the half-wave loss effect of light emitted from a light sparse substance to a light dense substance is utilized, the optical path difference of reflected light on the surface before reflection is just half wavelength, reflected light on the front surface and the rear surface of the film is cancelled, and the energy of the transmitted light is increased;
the optical thickness of the t film layer is as follows:
t＝λ/4
ncthe refractive index of the film material is as follows:
Figure BDA0002750975460000051
and optical glue with stable performance is filled among the materials such as the AR antireflection film, the conductive shielding film, the touch ITO electrode and the heating film, so that multiple reflections of light rays emitted from the outer layer on different media are prevented. By adopting the measures, the antireflection performance of the touch screen is effectively improved.
In application, the phenomenon of display whitening caused by reflection of strong light on the surface of the touch screen is effectively weakened, so that the contrast is stronger, and the color is clearer.
3. Touch film control
The upper ITO film and the lower ITO film have certain resistance values, the ITO of the upper layer and the lower layer are contacted through the deformation of the upper electrode ITO film when the upper electrode ITO film touches, and different resistance values are generated in an X axis and a Y axis through the difference of deformation positions (similar to the principle of a moving rheostat). The coordinates of the touch position can be confirmed and judged by measuring the difference of the resistance values of the X-axis resistor and the Y-axis resistor. And when the upper ITO and the lower ITO are not contacted, judging that no coordinate signal exists.
An insulating glue substance is arranged between the upper electrode ITO and the lower electrode ITO, the diameter of the insulating glue substance is generally 0.03-0.05, and the insulating glue substance is called as a spacer. The distance between the upper electrode ITO and the lower electrode ITO is kept under the condition of no stress, the accuracy of touch action is guaranteed, and meanwhile the magnitude of the operation force during touch can be adjusted through the magnitude of the separation points.
4. Electromagnetic shielding
Electromagnetic shielding is one of the main measures of electromagnetic compatibility technology, i.e. a metal shielding material is used to enclose an electromagnetic interference source. The surface of the general resistive touch screen is an ITO conductive film for touch induction, and cannot be lapped with other equipment on the surface to form a complete shielding body, so that electromagnetic interference can generate leakage on the surface of the touch screen.
In order to realize electromagnetic shielding, the conductive shielding film is attached to the second layer and is folded to the edge of the outer layer in an expanding way, so that a reliable electromagnetic overlapping surface is realized
The invention has the following beneficial effects: the most surface of the invention is provided with a layer of AR antireflection film which can reduce or eliminate the reflected light of optical surfaces such as lenses, prisms, plane mirrors and the like, thereby increasing the light transmission of the elements; the second layer is a transparent conductive shielding film, so that the light transmission amount can be increased, electromagnetic signals can be reduced, and radiation can be reduced;
ITO modified materials are added into the ITO upper electrode film and the ITO lower electrode glass, nano ITO is an ideal additive for preparing conductive and electromagnetic shielding materials, and after the ITO is modified, the nano ITO materials can fully embody the nano characteristics of the ITO materials, have good dispersibility, and have the particles reaching the original particle state as far as possible, and the mechanical property of the materials is further improved. The nano ITO is subjected to surface modification under the action of a coupling agent, the surface of the nano ITO is coated by the coupling agent and is coupled and connected with nicotinamide and ferric oxide, and the optical performance, the heat insulation performance and the heat and cold resistance of the material are further improved; on the other hand, nanometer ITO has still carried out coupling modification with the halloysite nanotube, and halloysite is a silicate mineral substance, can form strong effort with silane coupling agent to have better being connected with nanometer ITO, through adding the halloysite nanotube, can show improvement nanometer ITO's mechanical properties, thereby avoid the touch-sensitive screen receive fragile under the external force striking, the condition of split screen.
The doped stannic oxide is added, and the doping modification can improve SnO2The photoelectric property and the light transmittance are obviously improved, and the compound of the material and the ITO modified material can obviously improve the conductivity, the light transmittance and the mechanical property of the material;
0.1-1wt% of modified graphene and 0.5-1wt% of nicotinamide are added into the conductive shielding film, and the addition of the modified graphene and the nicotinamide can obviously improve the electromagnetic shielding resistance and mechanical property of the conductive shielding film, and further can improve the heat resistance and cold resistance of the material;
the resistance type touch screen improves the electric conduction and electromagnetic shielding performance of the ITO upper electrode film and the ITO lower electrode glass by adding the modified ITO material, has good mechanical property, optical property, heat-insulating property and heat resistance after further modification, obtains the resistance film through the 5-layer structure, has the application of shielding strong electromagnetic interference, resisting low temperature, resisting strong light and the like in severe environment, and has wide application prospect.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a resistive touch screen used in a harsh environment according to the present invention;
FIG. 2 is an SEM photograph of an ITO modified material in example 3 of the present invention;
reference numerals: 1. an AR antireflective film; 2. a conductive shielding film; 3. an ITO upper electrode film; 4. an ITO upper electrode film; 5. the film is heated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The conductive shielding film in the embodiment of the invention is a Xinyou vitamin UW-3317Q product, which is purchased from Xinyou vitamin adhesive products Co., Ltd, of Dongguan city, and has the thickness of 0.125mm +/-0.028, the width of 60mm, the shielding performance of 10-25dB and the light transmittance of 85% +/-5%.
Embodiment 1 a resistive touch panel for use in harsh environments
The touch screen is structurally divided into 5 layers, namely an AR antireflection film 1, a conductive shielding film 2, an ITO upper electrode film 3, ITO lower electrode glass 4 and a heating film 5 from outside to inside.
ITO modified materials are added into the ITO upper electrode film 3 and the ITO lower electrode glass 4. The addition amount of the ITO modified material on the ITO upper electrode film 3 is 0.1 wt%; the addition amount of the ITO lower electrode glass 4 was 0.1 wt%.
The preparation method of the ITO modified material comprises the following steps:
the raw materials comprise the following components in parts by weight: 50 parts of nano ITO, 200 parts of dispersion medium, 5 parts of halloysite nanotube, 10 parts of PEG2000, 1 part of coupling agent, 0.5 part of nicotinamide, 1.2 parts of iron oxide and 0.1 part of oleic acid. The coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: 0.5.
the preparation method comprises the following steps:
s1, ball-milling a halloysite nanotube to 1000 meshes, and drying to obtain powder;
s2, weighing nanometer ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a silane coupling agent KH550, heating to 60 ℃, reacting for 0.5h, adding nicotinamide, ferric oxide and oleic acid, ball-milling for 6h, performing ultrasonic dispersion for 30min, adding the powder obtained in the step S1, heating to 70 ℃, reacting for 1h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
0.1 wt% of graphene and 0.5 wt% of nicotinamide are added into the conductive shielding film 2.
Embodiment 2A resistive touch panel for use in harsh environments
The touch screen is structurally divided into 5 layers, namely an AR antireflection film 1, a conductive shielding film 2, an ITO upper electrode film 3, ITO lower electrode glass 4 and a heating film 5 from outside to inside.
ITO modified materials are added into the ITO upper electrode film 3 and the ITO lower electrode glass 4. The addition amount of the ITO modified material on the ITO upper electrode film 3 is 10 wt%; the amount of addition of the ITO lower electrode glass 4 was 15% by weight.
The preparation method of the ITO modified material comprises the following steps:
the raw materials comprise the following components in parts by weight: 100 parts of nano ITO, 500 parts of dispersion medium, 10 parts of halloysite nanotube, 40 parts of PEG2000, 2 parts of coupling agent, 1.5 parts of nicotinamide, 2 parts of iron oxide and 0.2 part of oleic acid. The coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: 1.
the preparation method comprises the following steps:
s1, ball-milling a halloysite nanotube to 2000 meshes, and drying to obtain powder;
s2, weighing nanometer ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a silane coupling agent KH560, heating to 80 ℃, reacting for 1h, adding nicotinamide, ferric oxide and oleic acid, performing ball milling for 10h, performing ultrasonic dispersion for 50min, adding the powder obtained in the step S1, heating to 90 ℃, reacting for 2h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
The conductive shielding film 2 is added with 1wt% of graphene and 1wt% of nicotinamide.
Embodiment 3A resistive touch panel for use in harsh environments
The touch screen is structurally divided into 5 layers, namely an AR antireflection film 1, a conductive shielding film 2, an ITO upper electrode film 3, ITO lower electrode glass 4 and a heating film 5 from outside to inside.
ITO modified materials are added into the ITO upper electrode film 3 and the ITO lower electrode glass 4. The addition amount of the ITO modified material on the ITO upper electrode film 3 is 5 wt%; the amount of addition of the ITO lower electrode glass 4 was 7% by weight.
The preparation method of the ITO modified material comprises the following steps:
the raw materials comprise the following components in parts by weight: 70 parts of nano ITO, 350 parts of dispersion medium, 7 parts of halloysite nanotube, 25 parts of PEG2000, 1.5 parts of coupling agent, 1 part of nicotinamide, 1.6 parts of iron oxide and 0.15 part of oleic acid. The coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: 0.7.
the preparation method comprises the following steps:
s1, ball-milling a halloysite nanotube to 1500 meshes, and drying to obtain powder;
s2, weighing nanometer ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a silane coupling agent KH570, heating to 70 ℃, reacting for 1h, adding nicotinamide, ferric oxide and oleic acid, performing ball milling for 8h, performing ultrasonic dispersion for 40min, adding the powder obtained in the step S1, heating to 80 ℃, reacting for 1.5h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
0.5 wt% of graphene and 0.7 wt% of nicotinamide are added into the conductive shielding film 2.
Example 4
Compared with example 3, graphene has modified graphene substitution.
The modified graphene is prepared by the following method:
s1, preparing graphene oxide by adopting a Hummers method;
weighing 10g of natural graphene, 4g of potassium persulfate and 10g of phosphorus pentoxide, adding the natural graphene, the potassium persulfate and the phosphorus pentoxide into a three-neck flask filled with 24mL of sulfuric acid under the condition of stirring, firstly reacting in a constant-temperature water bath at 60 ℃ for 3h, then moving the three-neck flask into a constant-temperature water bath at 25 ℃ for reacting for 5h, performing suction filtration, washing the three-neck flask to be neutral by using ionized water, and drying in the air to obtain pre-oxidized graphene;
step two, weighing lg of pre-oxidized graphene, adding the pre-oxidized graphene into a three-neck flask filled with 25mL of sulfuric acid under the condition of stirring, putting the pre-oxidized graphene into an ice-water bath, adding 3g of potassium permanganate after the pre-oxidized graphene is completely dissolved, reacting for 2 hours, moving the three-neck flask into a constant-temperature water bath at 35 ℃ for reacting for 40 minutes, finally adding deionized water, continuing to react for 1 hour at 35 ℃, and finally dropwise adding 30% of H2O2So that the solution turned bright yellow until no more gas was formed. The mixture was filtered by centrifugation while hot and washed to neutrality with a large amount of 5% hydrochloric acid and deionized water. After the final precipitate is subjected to lh ultrasonic oscillation, pouring the precipitate into a culture dish, and drying the precipitate for 24 hours at 90 ℃ to obtain flaky graphene oxide;
s2, dissolving 4.5g of graphene oxide in 50g of deionized water, performing ultrasonic treatment for 20min to form a uniform dispersion liquid, adding 1mol/L HCl, and adjusting the pH to 1.5; then stirring at room temperature, slowly dropwise adding 7g of silane coupling agent KH550, reacting for 11h to obtain modified graphene oxide, washing with absolute ethanol and deionized water to neutrality, finally drying in a vacuum drying oven at 60 ℃ for 48h, and storing for later use;
s3, dissolving 4.5g of modified graphene in 50g of deionized water, performing ultrasonic treatment for 20min to form a uniform dispersion liquid, adding 1.5g of hydrazine hydrate at 95 ℃ to reduce for 11h to obtain the modified graphene, washing the modified graphene to be neutral by absolute ethyl alcohol and deionized water, and drying for later use.
Comparative example 1
Compared with the embodiment 3, the ITO modified material is not added with nicotinamide, and other conditions are not changed.
The preparation method of the ITO modified material comprises the following steps:
the raw materials comprise the following components in parts by weight: 70 parts of nano ITO, 350 parts of dispersion medium, 25 parts of PEG2000, 1.5 parts of coupling agent, 2.6 parts of ferric oxide and 0.15 part of oleic acid. The coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: 0.7.
the preparation method comprises the following steps:
s1, ball-milling a halloysite nanotube to 1500 meshes, and drying to obtain powder;
s2, weighing nano ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a silane coupling agent KH570, heating to 70 ℃, reacting for 1h, adding ferric oxide and oleic acid, performing ball milling for 8h, performing ultrasonic dispersion for 40min, adding the powder obtained in the step S1, heating to 80 ℃, reacting for 1.5h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
Comparative example 2
Compared with the example 3, the ITO modified material is not added with ferric oxide, and other conditions are not changed.
The preparation method of the ITO modified material comprises the following steps:
the raw materials comprise the following components in parts by weight: 70 parts of nano ITO, 350 parts of dispersion medium, 25 parts of PEG2000, 1.5 parts of coupling agent, 2.6 parts of nicotinamide and 0.15 part of oleic acid. The coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: 0.7.
the preparation method comprises the following steps:
s1, ball-milling a halloysite nanotube to 1500 meshes, and drying to obtain powder;
s2, weighing nanometer ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a silane coupling agent KH570, heating to 70 ℃, reacting for 1h, adding nicotinamide and oleic acid, performing ball milling for 8h, performing ultrasonic dispersion for 40min, adding the powder obtained in the step S1, heating to 80 ℃, reacting for 1.5h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
Comparative example 3
Compared with the example 3, no halloysite nanotube is added into the ITO modified material, and other conditions are not changed.
The preparation method of the ITO modified material comprises the following steps:
the raw materials comprise the following components in parts by weight: 70 parts of nano ITO, 350 parts of dispersion medium, 25 parts of PEG2000, 1.5 parts of coupling agent, 1 part of nicotinamide, 1.6 parts of ferric oxide and 0.15 part of oleic acid. The coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: 0.7.
the preparation method comprises the following steps:
weighing nanometer ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a silane coupling agent KH570, heating to 70 ℃, reacting for 1h, adding nicotinamide, ferric oxide and oleic acid, performing ball milling for 8h, performing ultrasonic dispersion for 40min, heating to 80 ℃, reacting for 1.5h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
Comparative example 4
Compared with example 3, no graphene is added to the conductive shielding film, and other conditions are not changed.
Conductive shielding film 2 was added with 1.2 wt% niacinamide.
Comparative example 5
Compared with example 3, no nicotinamide was added to the conductive shielding film, and other conditions were not changed.
1.2 wt% of graphene is added to the conductive shielding film 2.
Comparative example 6
Compared with example 4, the modifier is replaced by the silane coupling agent KH550 to the silane coupling agent KH560, and other conditions are not changed.
Comparative example 7
Compared with example 4, the modifier is replaced by the silane coupling agent KH550 to the silane coupling agent KH570, and other conditions are not changed.
Test example 1 measurement of transmittance
The transmittance at a wavelength of 550nm of the touch screens prepared in examples and comparative examples was measured using a spectrophotometer (MCP-2200 manufactured by Shimadzu corporation). The results are shown in Table 1.
TABLE 1
Group of Transmittance (%)
Example 1 93
Example 2 95
Example 3 97
Example 4 98
Comparative example 1 80
Comparative example 2 82
Comparative example 3 92
Comparative example 4 90
Comparative example 5 89
Comparative example 6 95
Comparative example 7 96
Test example 2 measurement of resistance value
The touch screens prepared in examples and comparative examples were tested for resistance measurement (unit: Ω/m) using Rolesta (Loresta) HPMCP-T410 manufactured by Mitsubishi chemical2). The results are shown in Table 2.
TABLE 2
Group of Resistance value (omega/m)2)
Example 1 7
Example 2 7
Example 3 7
Example 4 2
Comparative example 1 19
Comparative example 2 12
Comparative example 3 10
Comparative example 4 28
Comparative example 5 31
Comparative example 6 5
Comparative example 7 4
Test example 3 evaluation of crack resistance
The touch panels obtained in examples and comparative examples were cut into a strip of 10cm × 1cm, wound around a cylindrical SUS (stainless steel) rod having a diameter of 3mm or 5mm, and the winding and unwinding of the SUS rod were repeated 10 times, followed by evaluation by optical microscope observation (20 times) in accordance with the following evaluation standards.
Evaluation indexes are as follows:
5: no cracks were observed in both the case of 3mm diameter and the case of 5mm diameter.
4: there were no cracks in the case of a diameter of 5mm, but one or two cracks were found in the case of a diameter of 3 mm.
3: one or two cracks were found in both the 3mm diameter and 5mm diameter cases.
2: 0 to 2 cracks were found in the case of a diameter of 5mm, and three or more cracks were found in the case of a diameter of 3 mm.
1: three or more cracks were found in both the 3mm diameter and the 5mm diameter.
The results are shown in Table 3.
TABLE 3
Group of Crack resistance
Example 1 5
Example 2 5
Example 3 5
Example 4 5
Comparative example 1 4
Comparative example 2 4
Comparative example 3 4
Comparative example 4 3
Comparative example 5 3
Comparative example 6 4
Comparative example 7 4
Test example 4 mechanical Property test
The tear resistance of the touch screens prepared in the examples and comparative examples was tested according to GB/T11999-1989 method of testing tear resistance of Plastic films and sheets by the Elmendorf method.
The touch panels prepared in the examples and comparative examples were tested for tensile impact properties according to GB/T13525-1992, test method for tensile impact Properties of plastics.
TABLE 4
Group of Tear Strength (N/cm) Tensile impact Strength (kJ/m)2) Elongation at Break (%)
Example 1 1583 15.7 257
Example 2 1652 15.9 265
Example 3 1674 16.2 272
Example 4 1982 20.2 325
Comparative example 1 982 10.2 115
Comparative example 2 1022 9.7 157
Comparative example 3 757 7.2 122
Comparative example 4 1457 12.4 245
Comparative example 5 1522 13.5 253
Comparative example 6 1573 15.9 267
Comparative example 7 1622 16.1 259
As can be seen from the above table, the touch screen prepared by the invention has good light transmittance (the light transmittance reaches 93-97%), mechanical properties (the tear strength reaches 1583-2The elongation at break reaches 257-272 percent), the crack resistance is better (5 level), and the resistance value is lower (7 omega/m)2)。
Compared with the example 3, the ITO modifier is only added with nicotinamide or ferric oxide respectively, so that the mechanical property and the light transmittance are obviously reduced; the surface of the nano ITO is modified under the action of a coupling agent, the surface of the nano ITO is coated by the coupling agent, the nano ITO and the coupling agent are modified under the action of the coupling agent, the surface of the nano ITO and the coupling agent is coated by nicotinamide and ferric oxide for mixed coupling, a compact protective film layer is formed on the surface, and microscopically, the nano ITO is in a needle-like whisker shape, the modified ITO can be well dispersed in a plastic matrix due to electrostatic repulsion, and the particles of the modified ITO can reach the state of original particles as far as possible. When the crack is expanded to the whisker by external force, the whisker has higher mechanical strength, bears external load and bridges between two opposite sides of the crack of the plastic matrix, if the crack needs to be expanded, more work is consumed, because the whisker and the plastic matrix have different mechanical properties and a bonding interface exists between the whisker and the plastic matrix, when the shear stress applied to the whisker is greater than the bonding strength of the interface between the plastic matrix and the whisker, the whisker can be pulled out, and at the moment, the bonding interface between the whisker and the plastic matrix can generate stripping and friction effects, so that the plastic matrix prevents the crack from expanding, the original expansion direction of the crack is limited, and the strength and the toughness of the material are improved. The mixed modification of the nicotinamide or the ferric oxide can play a role of synergy.
Compared with the embodiment 3, the mechanical property of the touch screen is remarkably reduced without adding the halloysite nanotube, the nano ITO is also subjected to coupling modification with the halloysite nanotube, the halloysite is a silicate mineral substance and can form strong acting force with a silane coupling agent, so that the nano ITO is better connected with the touch screen, and the mechanical property of the nano ITO can be remarkably improved by adding the halloysite nanotube, so that the touch screen is prevented from being broken and cracked under the impact of external force.
Compared with the embodiment 3, the conductive shielding film of the comparative example 4 and the comparative example 5 only adds the nicotinamide or the modified graphene, so that the resistance value is obviously increased, and the anti-cracking performance is obviously reduced; the addition of the modified graphene and the nicotinamide can obviously reduce the resistance value of the material, improve the crack resistance of the material and have a synergistic effect.
Example 4 compared with example 3, the resistance value of the modified graphene adopted to replace graphene is significantly reduced to 2 Ω/m2Thereby obviously improving the electrical performance of the touch screen; the mechanical property of the touch screen material is also obviously improved after the graphene is modified by the silane coupling agent KH550, compared with example 4, in comparative example 6 and comparative example 7, the modifying agents are KH560 and KH570 respectively, although the resistance value is improved compared with example 4, the difference of the mechanical property is not large compared with example 4, and therefore, the mechanical property of the material can also be obviously improved by adding the graphene modified by the silane coupling agent KH550, which is an unexpected discovery of the inventor.
Compared with the prior art, the AR antireflection film is arranged on the outermost surface of the optical film, so that the reflected light of optical surfaces such as lenses, prisms, plane mirrors and the like can be reduced or eliminated, and the light transmission quantity of the elements is increased; the second layer is a transparent conductive shielding film, so that the light transmission amount can be increased, electromagnetic signals can be reduced, and radiation can be reduced;
ITO modified materials are added into the ITO upper electrode film and the ITO lower electrode glass, nano ITO is an ideal additive for preparing conductive and electromagnetic shielding materials, and after the ITO is modified, the nano ITO materials can fully embody the nano characteristics of the ITO materials, have good dispersibility, and have the particles reaching the original particle state as far as possible, and the mechanical property of the materials is further improved. The nano ITO is subjected to surface modification under the action of a coupling agent, the surface of the nano ITO is coated by the coupling agent and is coupled and connected with nicotinamide and ferric oxide, and the optical performance, the heat insulation performance and the heat and cold resistance of the material are further improved; on the other hand, nanometer ITO has still carried out coupling modification with the halloysite nanotube, and halloysite is a silicate mineral substance, can form strong effort with silane coupling agent to have better being connected with nanometer ITO, through adding the halloysite nanotube, can show improvement nanometer ITO's mechanical properties, thereby avoid the touch-sensitive screen receive fragile under the external force striking, the condition of split screen.
The doped stannic oxide is added, and the doping modification can improve SnO2The photoelectric property and the light transmittance are obviously improved, and the compound of the material and the ITO modified material can obviously improve the conductivity, the light transmittance and the mechanical property of the material;
0.1-1wt% of modified graphene and 0.5-1wt% of nicotinamide are added into the conductive shielding film, and the addition of the modified graphene and the nicotinamide can obviously improve the electromagnetic shielding resistance and mechanical property of the conductive shielding film, and further can improve the heat resistance and cold resistance of the material;
the resistance type touch screen improves the electric conduction and electromagnetic shielding performance of the ITO upper electrode film and the ITO lower electrode glass by adding the modified ITO material, has good mechanical property, optical property, heat-insulating property and heat resistance after further modification, obtains the resistance film through the 5-layer structure, has the application of shielding strong electromagnetic interference, resisting low temperature, resisting strong light and the like in severe environment, and has wide application prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A resistive touch screen used in a severe environment is characterized in that the touch screen is structurally divided into 5 layers, namely an AR antireflection film (1), a conductive shielding film (2), an ITO upper electrode film (3), ITO lower electrode glass (4) and a heating film (5) from outside to inside;
0.1-1wt% of graphene and 0.5-1wt% of nicotinamide are added into the conductive shielding film;
ITO modified materials and doped tin dioxide are added into the ITO upper electrode film and the ITO lower electrode glass;
the addition amount of the ITO modified material on the ITO upper electrode film is 0.1-10 wt%; the addition amount of the ITO modified material in the ITO lower electrode glass is 0.1-15 wt%; the addition amount of the doped stannic oxide on the ITO upper electrode film and the ITO lower electrode glass is 0.05-0.15 wt%;
the ITO modified material is prepared from the following raw materials in parts by weight: 50-100 parts of nano ITO, 200-500 parts of dispersion medium, 5-10 parts of halloysite nanotube, 10-40 parts of PEG2000, 1-2 parts of coupling agent, 0.5-1.5 parts of nicotinamide, 1.2-2 parts of iron oxide and 0.1-0.2 part of oleic acid;
the coupling agent is a mixture of a silane coupling agent KH560 and a titanate coupling agent TMC-201, and the mass ratio is 5: (0.5-1).
2. The resistive touch screen used in severe environment according to claim 1, wherein the ITO modified material is prepared from the following raw materials in parts by weight: 70 parts of nano ITO, 350 parts of dispersion medium, 7 parts of halloysite nanotube, 25 parts of PEG2000, 1.5 parts of coupling agent, 1 part of nicotinamide, 1.6 parts of iron oxide and 0.15 part of oleic acid.
3. The resistive touch screen for harsh environments of claim 2 wherein the ITO modified material is prepared by the following method:
s1, ball-milling the halloysite nanotube to 1000-2000 meshes, and drying to obtain powder;
s2, weighing nanometer ITO into a dispersion medium, adding PEG2000, mixing and stirring uniformly, adding a coupling agent, heating to 60-80 ℃, reacting for 0.5-1h, adding nicotinamide, ferric oxide and oleic acid, performing ball milling for 6-10h, performing ultrasonic dispersion for 30-50min, adding the powder obtained in the step S1, heating to 70-90 ℃, reacting for 1-2h, and volatilizing to remove the dispersion medium to obtain the ITO modified material.
4. The resistive touch screen for harsh environments of claim 3 wherein the dispersion medium is selected from one or more of ethanol, acetone, dichloromethane, ethyl acetate, and water.
5. The resistive touch screen for harsh environments of claim 1 wherein the doped tin dioxide is prepared by the following steps: weighing Mo (NO)3)3·5H2O and SnCl4·5H2Adding O, adding into absolute ethyl alcohol, ultrasonically stirring until completely dissolving, adjusting reaction temperature to 40-70 ℃, dropwise adding into the transparent solution at uniform speed by using 20-25v/v% ammonia water as a precipitator, adjusting system pH =2-3, continuing stirring until the precipitation is complete, aging for 2h, filtering, washing with 15-25v/v% ethanol solution, and washing with absolute ethyl alcohol until no Cl is detected-So as to obtain the wet gel doped with the tin dioxide, drying the obtained gel at 70-80 ℃, grinding the gel into powder, calcining the powder in a program temperature controller at 1000-1200 ℃ for 1-3h, and grinding the powder to be below 100 meshes to obtain the doped tin dioxide.
6. The resistive touch screen for harsh environments of claim 1 wherein the graphene is replaced by modified graphene, the modified graphene being prepared by the following method:
s1, preparing graphene oxide by adopting a Hummers method;
s2, dissolving 4-5 parts by weight of graphene oxide in 50 parts by weight of deionized water, performing ultrasonic treatment for 10-30min to form a uniform dispersion liquid, adding 1mol/L HCl, and adjusting the pH value to 1-2; then stirring at room temperature, slowly dropwise adding 5-10 parts of silane coupling agent KH550, reacting for 10-12h to obtain modified graphene oxide, washing with absolute ethanol and deionized water to neutrality, finally drying in a vacuum drying oven at 60 ℃ for 48h, and storing for later use;
s3, dissolving 4-5 parts by weight of modified graphene in 50 parts by weight of deionized water, performing ultrasonic treatment for 10-30min to form a uniform dispersion liquid, adding 1-2 parts by weight of hydrazine hydrate at 90-100 ℃ to reduce for 10-12h to obtain the modified graphene, washing the modified graphene to be neutral by absolute ethyl alcohol and deionized water, and drying the modified graphene for later use.
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