CN111394009A - Low-precipitation protective film, preparation method thereof and touch screen - Google Patents
Low-precipitation protective film, preparation method thereof and touch screen Download PDFInfo
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- CN111394009A CN111394009A CN202010367406.9A CN202010367406A CN111394009A CN 111394009 A CN111394009 A CN 111394009A CN 202010367406 A CN202010367406 A CN 202010367406A CN 111394009 A CN111394009 A CN 111394009A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J135/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J135/02—Homopolymers or copolymers of esters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Optics & Photonics (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a low-precipitation protective film, which comprises a base material layer, a pressure-sensitive adhesive layer formed on the base material layer and a release layer attached to the pressure-sensitive adhesive layer; the pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of acrylate copolymer, 3-50 parts of curing agent and 10-100 parts of ethyl acetate; the weight average molecular weight of the acrylate copolymer is 100-180 ten thousand, the molecular polydispersity is 2-4, the glass transition temperature is-60 +/-10 ℃, and no micromolecular peak with the molecular weight less than 10000 exists in a gel permeation chromatogram; the release layer is a low-precipitation release film. The invention also discloses a preparation method of the low-precipitation protective film and a touch screen comprising the protective film. The low-precipitation protective film disclosed by the invention still has adsorbability after tolerating 65 ℃ and 95% RH3 days, and the phenomena of adhesive residue and white fog are not generated.
Description
Technical Field
The invention relates to the technical field of adhesive tapes, in particular to a low-precipitation protective film, a preparation method thereof and a touch screen comprising the protective film.
Background
With the change of science and technology, the living standard of people is continuously improved, and the use of electronic products such as mobile phones, tablet computers, personal computers and the like is quite popular. In the process of moving and using the electronic equipment, a large amount of static electricity is generated on the surface of the electronic equipment, so that the surface of the electronic equipment is easily polluted by contact, and the service life and the normal use of the electronic equipment are greatly influenced. Therefore, these electronic devices need to be protected by a film at the time of shipment.
Under natural conditions, protective films are subject to environmental influences during use. When the common protective film is used under the conditions of high temperature and high humidity, serious white fog and adhesive residue can occur. This is because in a high-temperature and high-humidity environment, after the protective film is used for a period of time, small molecules in the adhesive can be transferred to the surface of the screen, which causes pollution to the display screen, and the light transmittance is reduced, the haze is increased, and the display effect of the display is greatly affected. With the prolonging of the service life of electronic products, the white fog becomes more serious and the definition becomes lower. Therefore, the development of the low-precipitation protective film which has high temperature and high humidity resistance and is free of white mist is of great significance.
Chinese patent publication No. CN108707431A (published as 2018, 10/26) discloses a high temperature and high humidity resistant protective film which can maintain the characteristics of no residual gum, no yellowing, no fogging, and small change in peeling force under high temperature and high humidity environment (at 60 ℃, 90% humidity, 100h), and a method for preparing the same. However, in the protective film, the existence of the hydrophobic group in the glue can not completely prevent the macromolecule in the glue layer from being degraded into low molecular substances, and the glue itself contains the low molecular substances; meanwhile, the influence of small molecular substances in the release film on the adhesive layer is not considered in the scheme, so that the expected effect is difficult to achieve in the practical application process.
Disclosure of Invention
The invention aims to provide a low-precipitation protective film which has adsorbability after resisting 65 ℃ and 95% RH for 3 days and does not generate the phenomena of adhesive residue and white fog.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a protective film without white fog and with low precipitation after high temperature and high humidity, which comprises a base material layer, a pressure-sensitive adhesive layer with the thickness of 3-30 mu m and formed on the base material layer, and a release layer attached on the pressure-sensitive adhesive layer; the pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of acrylate copolymer, 3-50 parts of curing agent and 10-100 parts of ethyl acetate;
the weight average molecular weight of the acrylate copolymer is 100-180 ten thousand, the molecular polydispersity is 2-4, and the glass transition temperature is-60 +/-10 ℃; the gel permeation chromatogram of the copolymer has no peak of micromolecule with the molecular weight less than 10000; the release layer is a low-precipitation release film.
Further, the synthetic monomer of the acrylate copolymer is selected from one or more of tripropylene glycol diacrylate, 1, 6-hexanediol diacrylate and trimethylolpropane triacrylate.
Further, the curing agent is one or more of an amine curing agent, an epoxy curing agent and an isocyanate curing agent.
Further, the amine curing agent is one or more of vinyl triamine, ethylene diamine, dipropylene triamine and amido amine;
the isocyanate curing agent is one or more of hexamethylene polyisocyanate, isophorone diisocyanate, toluene diisocyanate and triglycidyl isocyanurate;
the epoxy curing agent is one or more of m-xylylenediamine type epoxy resin, bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin and four-functional group epoxy resin.
Further, the curing agent is a bi-component curing agent consisting of 1-48 parts of epoxy curing agent and 1-6 parts of isocyanate curing agent, and the solid content of the epoxy curing agent is 2%.
Further, the curing agent is a bi-component curing agent consisting of 10-20 parts of epoxy curing agent and 3-4 parts of isocyanate curing agent.
Further, the substrate layer is a PET film, a PI film, a CPP film or a BOPP film.
The second aspect of the present invention provides a method for preparing the low-deposition protective film according to the first aspect, including the steps of:
preparing coating liquid from 100 parts of acrylate copolymer, 3-50 parts of curing agent and 10-100 parts of ethyl acetate;
coating the coating liquid on a base material, and baking the base material through a drying tunnel to form a pressure-sensitive adhesive layer;
and attaching a low-precipitation release film to the pressure-sensitive adhesive layer to obtain a finished product.
Further, the drying tunnel comprises 7 sections of ovens, and the temperatures of the 7 sections of ovens are sequentially set as follows: 60-70 ℃, 80-95 ℃, 100-; the linear speed of the material passing through the drying tunnel is 10-30m/min, and the baking time is 56-168 s.
The invention provides a touch screen comprising the low-precipitation protective film.
Compared with the prior art, the invention has the beneficial effects that:
the low-precipitation protective film still has adsorbability after resisting 65 ℃ and 95% RH for 3 days, and the phenomena of adhesive residue and white fog do not occur. The protective film can be widely applied to various screen protections with higher cleanliness requirements.
Drawings
FIG. 1 is a schematic structural diagram of a protective film in an embodiment of the present invention;
the reference numbers in the figures illustrate: 1. a substrate layer; 2. a pressure sensitive adhesive layer; 3. and a release layer.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The experimental methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used therein are commercially available without otherwise specified.
As described in the background art, after the existing common protective film is used in a high-temperature and high-humidity environment for a long time, small molecular substances in the pressure-sensitive adhesive can be transferred to the surface of a screen, so that the display screen is polluted, the light transmittance is reduced, the haze is increased, namely, the phenomena of adhesive residue and white fog are generated, and the display effect of the display is greatly influenced.
In order to solve the technical problem, the invention provides a low-precipitation protective film, as shown in fig. 1, the protective film comprises a substrate layer 1, a pressure-sensitive adhesive layer 2 with a thickness of 3-30 μm formed on the substrate layer 1, and a release layer 3 attached on the pressure-sensitive adhesive layer 2.
In the invention, the pressure-sensitive adhesive layer 2 is prepared from the following raw materials in parts by weight: 100 parts of acrylate copolymer, 3-50 parts of curing agent and 10-100 parts of ethyl acetate. Wherein the weight average molecular weight of the acrylate copolymer is 100-180 ten thousand, the molecular Polydispersity (PDI) is 2-4, and the glass transition temperature (T)g) Is-60 + -10 deg.C, and has no peak of small molecules with molecular weight < 10000 in Gel Permeation Chromatography (GPC) diagram.
The protective film of the invention limits the weight average molecular weight of the acrylate copolymer to be 180 ten thousand, the molecular polydispersity coefficient to be 2-4, and no micromolecule peak with the molecular weight less than 10000 appears in a GPC (GPC) map, so that the pressure-sensitive adhesive prepared by taking the acrylate copolymer as a raw material has the characteristics of large molecular weight, narrow molecular weight distribution and low content of micromolecule substances, and thus, when the protective film is used in a high-temperature and high-humidity environment, the precipitation amount of the micromolecule substances is greatly reduced. When it is applied to a screen protective film, it is possible to remarkably reduce a white fog phenomenon of a display screen.
In addition, the inventor finds that the selection of the release film also has an influence on the white fog phenomenon of the protective film. Since the release agent of the common release film also contains micromolecular substances, the micromolecular substances can be transferred to the pressure-sensitive adhesive layer of the protective film in the process of attaching the release film and the pressure-sensitive adhesive, particularly in a high-temperature and high-humidity environment, the phenomena of adhesive residue and white fog of the protective film are increased, and the peeling force of the pressure-sensitive adhesive is reduced.
Based on the above findings, the present invention selects a low release film as the release layer, the low release film being defined as:
taking two groups of release films of the same kind, and respectively attaching 31B adhesive tapes to release surfaces of the release films; one group is baked for 20 hours at 70 ℃, and then is kept stand for 2 hours at normal temperature, and is marked as a baking group; the other group is not baked and is marked as an unbaked group; the peel force of the two groups of 31B adhesive tapes is tested under the conditions of 23 +/-1 ℃ and 50 +/-5% RH; if the ratio of the stripping force of the baked group to the unbaked group is more than or equal to 90 percent, the release film is defined as a low-precipitation release film.
According to the protective film disclosed by the invention, due to the adoption of the low-precipitation release film, when the protective film is used in a high-temperature and high-humidity environment, a large amount of small molecular substances in the release film cannot be transferred into the pressure-sensitive adhesive, so that the phenomena of adhesive residue and white fog of the protective film are reduced, and the influence of a release agent on the adhesive force of the pressure-sensitive adhesive is reduced.
In the invention, the synthetic monomer of the acrylate copolymer can be selected from any one or more of tripropylene glycol diacrylate, 1, 6-hexanediol diacrylate and trimethylolpropane triacrylate.
The content of the curing agent also has an important influence on the generation of the white fog phenomenon. When the content of the curing agent is too low, the adhesive force of the pressure-sensitive adhesive is too strong; when the content of the curing agent is too high, excessive curing agent not only affects the adhesive force of the pressure-sensitive adhesive, but also excessive micromolecular curing agent can be separated out under the high-temperature and high-humidity environment, so that the white fog phenomenon is caused. In the invention, the curing agent is any one or combination of more of an amine curing agent, an epoxy curing agent and an isocyanate curing agent. The amine curing agent may be one or more selected from the group consisting of vinyl triamine (DETA), Ethylenediamine (EDA), dipropylene triamine (DPTA), and amidoamines; the isocyanate curing agent can be one or more selected from hexamethylene polyisocyanate, isophorone diisocyanate, toluene diisocyanate and triglycidyl isocyanurate; the epoxy curing agent may be one or more selected from m-xylylenediamine type epoxy resin, bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, and tetrafunctional group epoxy resin.
In the invention, the curing agent is preferably a two-component curing agent consisting of 1-48 parts of epoxy curing agent and 1-6 parts of isocyanate curing agent, and the solid content of the epoxy curing agent is 2%; further a bi-component curing agent which is composed of 10-20 parts of epoxy curing agent and 3-4 parts of isocyanate curing agent. The two-component curing agent is preferably a non-yellowing curing agent, has good weather resistance and excellent transparency and optical property, and ensures the light transmittance of the protective film. By adjusting the use ratio of the curing agent to the adhesive, the adhesive layer can achieve proper adhesive force and weather resistance.
In the present invention, the material of the base material layer is not limited, but is preferably a PET film, a PI film, a cast polypropylene (CPP) film or a biaxially oriented polypropylene (BOPP) film, and the thickness thereof is preferably 25 μm to 125 μm.
The invention also provides a preparation method of the low-precipitation protective film, which comprises the following steps:
preparing coating liquid from 100 parts of acrylate copolymer, 3-50 parts of curing agent and 10-100 parts of ethyl acetate;
coating the coating liquid on a base material, and baking the base material through a drying tunnel to form a pressure-sensitive adhesive layer;
and attaching a low-precipitation release film to the pressure-sensitive adhesive layer to obtain a finished product.
In the preparation method, the preparation method of the coating liquid comprises the following steps: mixing 100 parts of acrylic acid adhesive and 10-100 parts of ethyl acetate, uniformly stirring, continuously adding 3-50 parts of curing agent, and stirring for 20-30 minutes to obtain the coating liquid.
During the baking process, if the coating liquid is not completely baked, the small molecular substances on the release film are dissolved and transferred to the surface of the adhesive, and the white fog phenomenon is also caused. In the invention, the drying tunnel preferably consists of 7 sections of ovens, and the temperatures of the 7 sections of ovens are sequentially set as follows: 60-70 ℃, 80-95 ℃, 100-. Preferably, the linear speed of the drying tunnel is 10-30m/min, and the baking time is 56-168 s. By the above baking system, the coating liquid is completely baked.
The low-precipitation protective film can be applied to a touch screen. It is expected that the touch panel with the low-precipitation protective film can be used for a long time in a high-temperature and high-humidity environment without generating a white fog phenomenon.
In each of the following examples and comparative examples, the acrylic copolymer used had a weight average molecular weight of 100-180 ten thousand and a glass transition temperature TgThe temperature is minus 60 +/-10 ℃, the solid content of the used four-functional-group epoxy resin is 2 percent, and the used release film is a low-precipitation release film.
Example 1
1. Preparation of coating liquid
100 parts of acrylate copolymer (PDI is 2, no peak with molecular weight less than 10000 in GPC chart) and 10 parts of ethyl acetate are mixed and stirred uniformly, then 12 parts of four-functional group epoxy resin and 3 parts of 2, 4-Toluene Diisocyanate (TDI) are added, stirred for 20-30 minutes, sealed and kept stand for later use.
2. Preparation of protective film
Uniformly coating the coating liquid on a PET substrate with the thickness of 25 μm on a coating machine by a scraper, wherein the coating thickness is 3 μm; and then baking for 112s through a drying tunnel at a linear speed of 15m/min, attaching the low-precipitation release film, and rolling to obtain a finished product.
Comparative example 1
1. Preparation of coating liquid
100 parts of acrylate copolymer (PDI is 3, no peak with molecular weight less than 10000 in GPC chart) and 100 parts of ethyl acetate are mixed and stirred uniformly, then 65 parts of 2, 4-toluene diisocyanate is added, stirred for 20-30 minutes, sealed and kept stand for later use.
2. Preparation of protective film
Uniformly coating the coating liquid on a PET substrate with the thickness of 25 μm on a coating machine by a scraper, wherein the coating thickness is 3 μm; and then passing through a drying tunnel 93s at a linear speed of 18m/min, attaching the low-precipitation release film, and rolling to obtain a finished product.
Comparative example 2
1. Preparation of coating liquid
100 parts of acrylate copolymer (PDI is 5, and a peak with the molecular weight less than 10000 in a GPC chart) and 10 parts of ethyl acetate are mixed and stirred uniformly, then 12 parts of four-functional group epoxy resin and 3 parts of 2, 4-toluene diisocyanate are added, stirred for 20-30 minutes, sealed and kept stand for later use.
2. Preparation of protective film
Uniformly coating the coating liquid on a PET substrate with the thickness of 25 μm on a coating machine by a scraper, wherein the coating thickness is 3 μm; and then passing through a drying tunnel for 84s at a linear speed of 20m/min, attaching the low-precipitation release film, and rolling to obtain a finished product.
Comparative example 3
1. Preparation of coating liquid
100 parts of acrylate copolymer (PDI is 3, no peak with molecular weight less than 10000 in GPC chart) and 100 parts of ethyl acetate are mixed and stirred uniformly, then 65 parts of four-functional group epoxy resin is added, stirred for 20-30 minutes, sealed and kept stand for standby.
2. Preparation of protective film
Uniformly coating the coating liquid on a PET substrate with the thickness of 25 μm on a coating machine by a scraper, wherein the coating thickness is 30 μm; and then passing through a drying tunnel for 112s at a linear speed of 15m/min, attaching the low-precipitation release film, and rolling to obtain a finished product.
Wiping the glass clean, and observing under a strong light until the glass is clean; then, the protective films prepared in example 1 and comparative examples 1 to 3 were attached to the front and back surfaces of the glass, taken out after 3 days in an environment of 65 ℃ and 95% RH, and the surface of the glass was observed under a highlight lamp for the presence of white fog. The results obtained are shown in table 1.
Table 1 performance index of protective films prepared in examples and comparative examples
Referring to the results of table 1, the protective films of comparative examples 1 to 3 all exhibited a severe white haze phenomenon after being resistant to 65 ℃ and 95% RH for 3 days, and the peeling force of the protective films of comparative examples 1 and 3 also exhibited a great decrease. The low-deposition protective film of example 1 did not generate the white haze phenomenon, and still had a high peeling force. The low-precipitation protective film can be widely applied to various screen protections with higher cleanliness requirements.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The low-precipitation protective film is characterized by comprising a base material layer, a pressure-sensitive adhesive layer with the thickness of 3-30 mu m and formed on the base material layer, and a release layer attached to the pressure-sensitive adhesive layer;
the pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of acrylate copolymer, 3-50 parts of curing agent and 10-100 parts of ethyl acetate;
the weight average molecular weight of the acrylate copolymer is 100-180 ten thousand, the molecular polydispersity is 2-4, the glass transition temperature is-60 +/-10 ℃, and no micromolecular peak with the molecular weight less than 10000 exists in a gel permeation chromatogram;
the release layer is a low-precipitation release film.
2. The low deposition protective film according to claim 1, wherein the synthetic monomer of the acrylate copolymer is one or more selected from the group consisting of tripropylene glycol diacrylate, 1, 6-hexanediol diacrylate, and trimethylolpropane triacrylate.
3. The low-deposition protective film according to claim 1, wherein the curing agent is one or more of an amine curing agent, an epoxy curing agent, and an isocyanate curing agent.
4. The low deposition protective film according to claim 3, wherein the amine curing agent is one or more of vinyl triamine, ethylene diamine, dipropylene triamine, and amido amine;
the isocyanate curing agent is one or more of hexamethylene polyisocyanate, isophorone diisocyanate, toluene diisocyanate and triglycidyl isocyanurate;
the epoxy curing agent is one or more of m-xylylenediamine type epoxy resin, bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin and four-functional group epoxy resin.
5. The low-precipitation protective film according to claim 3, wherein the curing agent is a two-component curing agent consisting of 1-48 parts of epoxy curing agent and 1-6 parts of isocyanate curing agent, and the solid content of the epoxy curing agent is 2%.
6. The low-precipitation protective film according to claim 5, wherein the curing agent is a two-component curing agent consisting of 10-20 parts of epoxy curing agent and 3-4 parts of isocyanate curing agent.
7. The low-precipitation protective film according to claim 1, wherein the substrate layer is a PET film, a PI film, a CPP film or a BOPP film.
8. The method for preparing a low-deposition protective film according to any one of claims 1 to 7, comprising the steps of:
preparing coating liquid from 100 parts of acrylate copolymer, 3-50 parts of curing agent and 10-100 parts of ethyl acetate;
coating the coating liquid on a base material, and baking the base material through a drying tunnel to form a pressure-sensitive adhesive layer;
and attaching a low-precipitation release film to the pressure-sensitive adhesive layer to obtain a finished product.
9. The method for preparing a low-precipitation protective film according to claim 8, wherein the drying tunnel is composed of 7 sections of ovens, and the temperatures of the 7 sections of ovens are sequentially set as follows: 60-70 ℃, 80-95 ℃, 100-; the linear speed of the material passing through the drying tunnel is 10-30m/min, and the baking time is 56-168 s.
10. A touch panel comprising the low-deposition protective film according to any one of claims 1 to 7.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604167A (en) * | 2021-09-06 | 2021-11-05 | 江苏斯迪克新材料科技股份有限公司 | Non-silicon transfer protective film and preparation method thereof |
| CN114874712A (en) * | 2022-05-31 | 2022-08-09 | 广东东立新材料科技股份有限公司 | Easily-stripped anti-aging protective film and preparation method and application thereof |
| CN115806785A (en) * | 2022-09-07 | 2023-03-17 | 广东东立新材料科技股份有限公司 | Pressure-sensitive adhesive and code-carving adhesive tape prepared from same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206277A (en) * | 2006-12-15 | 2008-06-25 | 日东电工株式会社 | Pressure-sensitive adhesive optical film and image display |
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- 2020-04-30 CN CN202010367406.9A patent/CN111394009A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206277A (en) * | 2006-12-15 | 2008-06-25 | 日东电工株式会社 | Pressure-sensitive adhesive optical film and image display |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604167A (en) * | 2021-09-06 | 2021-11-05 | 江苏斯迪克新材料科技股份有限公司 | Non-silicon transfer protective film and preparation method thereof |
| CN114874712A (en) * | 2022-05-31 | 2022-08-09 | 广东东立新材料科技股份有限公司 | Easily-stripped anti-aging protective film and preparation method and application thereof |
| CN115806785A (en) * | 2022-09-07 | 2023-03-17 | 广东东立新材料科技股份有限公司 | Pressure-sensitive adhesive and code-carving adhesive tape prepared from same |
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Application publication date: 20200710 |