CN111849380A - Preparation method of ultrathin adhesive tape with controllable thickness - Google Patents
Preparation method of ultrathin adhesive tape with controllable thickness Download PDFInfo
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- CN111849380A CN111849380A CN202010779339.1A CN202010779339A CN111849380A CN 111849380 A CN111849380 A CN 111849380A CN 202010779339 A CN202010779339 A CN 202010779339A CN 111849380 A CN111849380 A CN 111849380A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0209—Multistage baking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- 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
-
- 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
-
- 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
- C09J11/08—Macromolecular additives
-
- 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
- C09J133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
- C09J133/12—Homopolymers or copolymers of methyl methacrylate
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- 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
- C09J2433/00—Presence of (meth)acrylic polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Adhesive Tapes (AREA)
Abstract
The invention discloses a preparation method of an ultrathin adhesive tape with controllable thickness, which comprises the following steps: (1) taking a base material, and coating an adhesive on the base material; the adhesive comprises the following components in parts by weight: 5-15 parts of acrylate copolymer, 1-5 parts of tackifying resin, 0.1-0.2 part of cross-linking agent, 80-90 parts of base solvent and 2-10 parts of high-boiling-point solvent; (2) sending the base material coated with the adhesive into drying equipment, drying, and curing the adhesive coated on the base material to form an adhesive layer to prepare the ultrathin adhesive tape; the drying equipment comprises two sections of heating areas; the temperature of the first section of heating area is 80-85 ℃, the temperature of the second section of heating area is a gradual heating area, the temperature of the second section of heating area is gradually increased along the material conveying direction of the adhesive tape, the temperature of the foremost area of the second section of heating area is 110-115 ℃, and the temperature of the rearmost area of the second section of heating area is 140-145 ℃. The method can control the whole thickness of the adhesive tape to reach a lower value on the basis of ensuring that the adhesive tape has better adhesive property, so as to form the ultrathin adhesive tape.
Description
Technical Field
The invention belongs to the technical field of adhesive tapes, and particularly relates to a preparation method of an ultrathin adhesive tape with controllable thickness.
Background
The pressure sensitive adhesive tape is used as an indispensable important material in various industrial industries, and different single-sided and double-sided pressure sensitive adhesive products can perform different functions such as fixing, wrapping, surface protection and the like by combining various base materials with different thicknesses and adhesive layers coated on the surfaces.
In the sophisticated electronic industry, as electronic products, especially consumer electronic products such as mobile phones, earphones, smart watches, and the like, are gradually designed to be light and portable, the internal structural design and the redundant space of the products are gradually compressed, the sizes, especially the thicknesses, of various adhesive tape materials must be thinner and thinner, and the requirements on the performance are higher and higher. Meanwhile, as the internal components and structures of electronic products become more complex, the demand for heat dissipation and wireless charging increases, and a heat dissipation and wireless charging module must be added inside the electronic products, which further increases the demand for ultra-thin adhesive tapes (thickness not more than 5 μm) for the electronic industry.
Specifically, the heat dissipation module of the electronic product is usually composed of 2-3 layers of graphite sheets with the thickness of 17-25 μm, the graphite sheets are bonded and fixed by using an ultrathin double-sided adhesive tape, and finally, a layer of single-sided adhesive tape is attached to the front surface and the back surface respectively for packaging. Thus, the thickness of the whole module needs to be strictly controlled, and therefore, the double-sided and single-sided tapes used therein need to be strictly controlled in terms of adhesive strength, thickness and thickness tolerance. The wireless charging module of electronic products generally refers to a wireless charging receiving end module in consumer electronic products, and a main body of the wireless charging receiving end module generally consists of a transmission coil and a special magnetic material, wherein most of the magnetic material is designed by adopting a multi-layer composite structure of nanocrystalline materials at present, at most, more than 13 layers are adopted, each layer is compounded and fixed by using an ultrathin double-sided adhesive tape, and a layer of single-sided adhesive tape is attached to the upper layer and the lower layer to be used as packaging. Similarly, the thickness of the entire module is strictly controlled, and the tape used is also basically required to be pressed to a thickness of at least 5 μm or less, and the adhesion is strictly controlled.
In summary, the demand for the production of ultra-thin adhesive tapes in the electronics industry is continuously increasing, but the performance of the ultra-thin adhesive tapes is ensured to face a plurality of difficulties, among which: how to ensure that the ultrathin adhesive tape has enough adhesive force while ensuring smaller thickness. Taking the ultra-thin adhesive tape between the heat dissipation module and the wireless charging and receiving module as an example, the adhesive force generally needs to be at least over 500gf/25mm, and on this basis, in order to obtain the ultra-thin adhesive layer, the thickness of the adhesive coating on the adhesive tape substrate needs to be strictly controlled, which has higher requirements on the coating machine.
Because the overall thickness is low, the bonding performance of the ultrathin adhesive tape is influenced by the coating condition of the adhesive to a much higher degree than that of the common adhesive tape; if slight coating unevenness occurs, the adhesion and shear direction resistance of the tape may be significantly affected. The uniformity of the coating of the glue layer is affected by the performance of the coating machine, and also by the solvent which is continuously volatilized during coating. The common solvent used for gluing, such as ethyl acetate and the like, has a high volatilization speed, and may not flow at a constant speed and cover at certain points in the coating process, so that the phenomenon of uneven coating occurs.
Therefore, it is necessary to develop a process for preparing an adhesive tape, which can obtain an ultra-thin adhesive tape with a relatively low thickness and simultaneously ensure that the ultra-thin adhesive tape has a relatively good adhesive property.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a method for preparing an ultra-thin adhesive tape with controllable thickness, which can make the coating of an adhesive more uniform by improving the fluidity of the adhesive during the coating and drying processes, ensure the adhesive property of the adhesive tape, and control the overall thickness of the adhesive tape by controlling the coating amount and the coating thickness on the basis of uniform coating.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a preparation method of an ultrathin adhesive tape with controllable thickness comprises the following steps:
(1) taking a base material, and coating an adhesive on the base material; the adhesive comprises the following components in parts by weight: 5-15 parts of acrylate copolymer, 1-5 parts of tackifying resin, 0.1-0.2 part of cross-linking agent, 80-90 parts of base solvent and 2-10 parts of high-boiling-point solvent;
(2) sending the base material coated with the adhesive into drying equipment, drying, and curing the adhesive coated on the base material to form an adhesive layer combined with the base material to prepare the ultrathin adhesive tape; the drying equipment comprises two sections of heating areas; the temperature of the first section of heating area is 80-85 ℃, the temperature of the second section of heating area is a gradual heating area, the temperature of the second section of heating area is gradually increased along the material conveying direction of the adhesive tape, the temperature of the foremost area of the second section of heating area is 110-115 ℃, and the temperature of the rearmost area of the second section of heating area is 140-145 ℃.
Preferably, the acrylate copolymer is a copolymer obtained by polymerizing one or two or more acrylate monomers.
Preferably, the tackifying resin is one or a mixture of at least two of rosin resin, petroleum resin and terpene resin.
Preferably, the crosslinking agent is an isocyanate-based crosslinking agent.
Preferably, the base solvent is one of ethyl acetate, n-hexane, cyclohexane and n-heptane.
Preferably, the high boiling point solvent has a boiling point greater than 135 ℃.
Still more preferably, the high boiling point solvent is one of xylene and DMF.
The invention has the beneficial effects that:
according to the invention, a small amount of high-boiling-point solvent is introduced into a basic solvent, and a heating and drying process is matched to obtain an ultrathin adhesive tape with good bonding performance; specifically, the first heating zone heats the surface of the coated adhesive layer, and the volatilization of the solvent is facilitated by preheating; the second section of heating area is a gradual heating area, and the basic solvent is gradually evaporated through gradual heating to form a curing glue layer attached to the surface of the base material; the introduced high-boiling-point solvent is matched with the basic solvent, so that the boiling point of the mixed solvent is obviously increased, and under the synergistic action of the two solvents, the basic solvent can be prevented from directly entering an evaporation state in the first-stage heating area, so that the basic solvent is prevented from evaporating in advance, and the problem that the flowability of the adhesive in the second-stage heating area is poor is further avoided, namely, the coating uniformity is improved by improving the flowability of the adhesive, so that the bonding performance of the adhesive tape is ensured; a small amount of high boiling point solvent in the second heating area can be completely evaporated at a higher heating temperature, so that the combination of the glue layer and the base material is not affected. On the basis of the effects, the coating amount and the coating thickness of the adhesive tape can be easily controlled to be lower values, so that the ultrathin adhesive tape with better adhesive property can be obtained.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example 1
A preparation method of an ultrathin adhesive tape with controllable thickness comprises the following steps:
(1) taking a base material, and coating an adhesive on the base material; the adhesive comprises the following components in parts by weight: 5 parts of acrylate copolymer, 2 parts of rosin resin, 0.1 part of isocyanate crosslinking agent, 80 parts of ethyl acetate and 2 parts of xylene; wherein the acrylate copolymer is prepared by mixing methyl methacrylate, n-butyl methacrylate and lauryl methacrylate in a weight ratio of 5: 4: 2 is polymerized to obtain the product;
(2) sending the base material coated with the adhesive into drying equipment, drying, and curing the adhesive coated on the base material to form an adhesive layer combined with the base material to prepare the ultrathin adhesive tape; the drying equipment comprises two sections of heating areas; the temperature of the first section of heating area is 80 ℃, the temperature of the second section of heating area is a gradual heating area, specifically, the temperature of the second section of heating area is gradually increased along the material conveying direction (from front to back) of the adhesive tape, the temperature of the foremost area of the second section of heating area is 110 ℃, and the temperature of the rearmost area of the second section of heating area is 140 ℃.
Example 2
A preparation method of an ultrathin adhesive tape with controllable thickness comprises the following steps:
(1) taking a base material, and coating an adhesive on the base material; the adhesive comprises the following components in parts by weight: 10 parts of acrylate copolymer, 3 parts of rosin resin, 0.1 part of isocyanate crosslinking agent, 85 parts of ethyl acetate and 5 parts of xylene; wherein the acrylate copolymer is prepared by mixing methyl methacrylate, n-butyl methacrylate and lauryl methacrylate in a weight ratio of 5: 4: 2 is polymerized to obtain the product;
(2) sending the base material coated with the adhesive into drying equipment, drying, and curing the adhesive coated on the base material to form an adhesive layer combined with the base material to prepare the ultrathin adhesive tape; the drying equipment comprises two sections of heating areas; the temperature of the first section of heating area is 80 ℃, the temperature of the second section of heating area is a gradual heating area, specifically, the temperature of the second section of heating area is gradually increased along the material conveying direction (from front to back) of the adhesive tape, the temperature of the foremost area of the second section of heating area is 110 ℃, and the temperature of the rearmost area of the second section of heating area is 140 ℃.
Example 3
A preparation method of an ultrathin adhesive tape with controllable thickness comprises the following steps:
(1) taking a base material, and coating an adhesive on the base material; the adhesive comprises the following components in parts by weight: 15 parts of acrylate copolymer, 5 parts of petroleum resin, 0.2 part of isocyanate crosslinking agent, 90 parts of ethyl acetate and 10 parts of xylene; wherein the acrylate copolymer is prepared by mixing methyl methacrylate, n-butyl methacrylate and lauryl methacrylate in a weight ratio of 5: 4: 2 is polymerized to obtain the product;
(2) sending the base material coated with the adhesive into drying equipment, drying, and curing the adhesive coated on the base material to form an adhesive layer combined with the base material to prepare the ultrathin adhesive tape; the drying equipment comprises two sections of heating areas; the temperature of the first section of heating area is 80 ℃, the temperature of the second section of heating area is a gradual heating area, specifically, the temperature of the second section of heating area is gradually increased along the material conveying direction (from front to back) of the adhesive tape, the temperature of the foremost area of the second section of heating area is 110 ℃, and the temperature of the rearmost area of the second section of heating area is 140 ℃.
The ultra-thin tape samples of examples 1-3 were tested; tests show that the thickness of the ultrathin adhesive tapes of the examples 1 to 3 is less than 4.5 mu m, and the thickness distribution is uniform; meanwhile, the peeling force of the ultra-thin tapes of examples 1 to 3 was all 600-.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (7)
1. A preparation method of an ultrathin adhesive tape with controllable thickness is characterized by comprising the following steps:
(1) taking a base material, and coating an adhesive on the base material; the adhesive comprises the following components in parts by weight: 5-15 parts of acrylate copolymer, 1-5 parts of tackifying resin, 0.1-0.2 part of cross-linking agent, 80-90 parts of base solvent and 2-10 parts of high-boiling-point solvent;
(2) sending the base material coated with the adhesive into drying equipment, drying, and curing the adhesive coated on the base material to form an adhesive layer combined with the base material to prepare the ultrathin adhesive tape; the drying equipment comprises two sections of heating areas; the temperature of the first section of heating area is 80-85 ℃, the temperature of the second section of heating area is a gradual heating area, the temperature of the second section of heating area is gradually increased along the material conveying direction of the adhesive tape, the temperature of the foremost area of the second section of heating area is 110-115 ℃, and the temperature of the rearmost area of the second section of heating area is 140-145 ℃.
2. A method for preparing an ultra-thin adhesive tape with controllable thickness as claimed in claim 1, wherein the acrylate copolymer is a copolymer obtained by polymerizing one or two or more acrylate monomers.
3. The method of claim 1 wherein the tackifying resin is one or a mixture of at least two of rosin resin, petroleum resin, terpene resin.
4. A method for preparing an ultra-thin adhesive tape with controllable thickness as claimed in claim 1, wherein the cross-linking agent is isocyanate cross-linking agent.
5. The method of claim 1, wherein the base solvent is one of ethyl acetate, n-hexane, cyclohexane, and n-heptane.
6. A method of making ultrathin adhesive tape of controllable thickness as claimed in claim 1, characterized in that the boiling point of the high boiling point solvent is more than 135 ℃.
7. A method for preparing ultrathin adhesive tape with controllable thickness as claimed in claim 6, characterized in that the high boiling point solvent is one of xylene and DMF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010779339.1A CN111849380A (en) | 2020-08-05 | 2020-08-05 | Preparation method of ultrathin adhesive tape with controllable thickness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010779339.1A CN111849380A (en) | 2020-08-05 | 2020-08-05 | Preparation method of ultrathin adhesive tape with controllable thickness |
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| CN111849380A true CN111849380A (en) | 2020-10-30 |
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| CN202010779339.1A Pending CN111849380A (en) | 2020-08-05 | 2020-08-05 | Preparation method of ultrathin adhesive tape with controllable thickness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149534A (en) * | 2021-12-29 | 2022-03-08 | 苏州市奥贝新材料科技有限公司 | High-viscosity acid-free acrylic resin, high-viscosity low-viscosity ultrathin composite film adhesive tape and preparation method |
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| CN104152077A (en) * | 2014-08-13 | 2014-11-19 | 隆昌羽玺新材料科技有限公司 | Ultra-thin polyester double-sided adhesive tape, glue thereof, and preparation method thereof |
| CN111087950A (en) * | 2019-12-23 | 2020-05-01 | 崴思新材料泰州有限公司 | Adhesive, double-sided tape applying adhesive and preparation method of double-sided tape |
| CN111378394A (en) * | 2020-03-24 | 2020-07-07 | 太仓斯迪克新材料科技有限公司 | Ultrathin single-side grid PET double-sided tape and preparation method thereof |
-
2020
- 2020-08-05 CN CN202010779339.1A patent/CN111849380A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104152077A (en) * | 2014-08-13 | 2014-11-19 | 隆昌羽玺新材料科技有限公司 | Ultra-thin polyester double-sided adhesive tape, glue thereof, and preparation method thereof |
| CN111087950A (en) * | 2019-12-23 | 2020-05-01 | 崴思新材料泰州有限公司 | Adhesive, double-sided tape applying adhesive and preparation method of double-sided tape |
| CN111378394A (en) * | 2020-03-24 | 2020-07-07 | 太仓斯迪克新材料科技有限公司 | Ultrathin single-side grid PET double-sided tape and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149534A (en) * | 2021-12-29 | 2022-03-08 | 苏州市奥贝新材料科技有限公司 | High-viscosity acid-free acrylic resin, high-viscosity low-viscosity ultrathin composite film adhesive tape and preparation method |
| CN114149534B (en) * | 2021-12-29 | 2023-02-28 | 苏州市奥贝新材料科技有限公司 | High-viscosity acid-free acrylic resin, high-viscosity low-viscosity ultrathin composite film adhesive tape and preparation method |
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Application publication date: 20201030 |