CN114149765A

CN114149765A - Adhesive film, preparation method and application thereof

Info

Publication number: CN114149765A
Application number: CN202210003959.5A
Authority: CN
Inventors: 滕超; 孙书政; 李士锋; 王国伟
Original assignee: Anhui Yicheng Material Science & Technology Co ltd
Current assignee: Lu'anyi New Material Technology Co ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-03-08
Anticipated expiration: 2042-01-05
Also published as: CN114149765B

Abstract

The invention provides an adhesive film which comprises a frosted grid release layer, an adhesive layer and a film layer. The invention also provides a method for preparing the adhesive film and application of the adhesive film in advertising, decoration and the like. The adhesive film of the invention basically reaches zero initial adhesion and has good reworkability; meanwhile, the adhesive has high peeling force and good bonding effect; and the preparation process is simple and easy to operate.

Description

Adhesive film, preparation method and application thereof

Technical Field

The invention relates to the field of adhesive materials, in particular to an adhesive film, a preparation method thereof and application thereof in advertising, decoration and the like.

Background

The advertisement propaganda and decoration film has penetrated the square of human life and work, and is widely used in various advertisement and display fields, large application places such as large-scale shopping malls, high-speed railway stations, subways, office halls, restaurants and the like, small application places such as refrigerators, automobiles, buses, containers and the like, and the use amount of the film is increasing. At present, patterns and characters are printed on the surface of a base material such as PVC through modes such as color digital printing or traditional screen printing, the back surface of the base material is coated with a pressure-sensitive adhesive, and the base material is adhered to a specific position through a mode of film adhesive tapes.

Because of the complicated environment of pasting, outer wall, show window, car appearance etc. are mostly non-planar structure, have more irregular corner, need many times and tear the subsides repeatedly when the pad pasting, until the pad pasting aligns the position completely, if too big unfavorable repeated construction of initial adhesion of pressure sensitive adhesive, leave behind adhesive tape defect, substrate tensile deformation etc. harmfully when pasting again easily, efficiency of construction and yield are obviously lower. Therefore, the ideal film-sticking adhesive tape has extremely low initial adhesion or even no initial adhesion, can be torn off at will, and shows good adhesive force immediately after the construction aligned with the position.

US5008139A discloses a zero tack pressure sensitive adhesive layer by uniformly arranging "non-tacky solid particles" on the surface of the pressure sensitive adhesive, wherein a part of the particles is embedded in the adhesive layer and a part is exposed outside the adhesive. During practical application, the adhesive layer and the adhered object are isolated through the particles, the effect of zero initial adhesion is achieved, the adhesive film can be moved randomly at the moment until the adhering position is found, finally, the solid particles are pressed into the adhesive through applying pressure, the adhesive layer is in contact with the adhered object, and finally, the adhesion force is formed. The technical scheme has the following defects: 1. the method has strong requirements on the arrangement equipment and the process of the non-sticky solid particles, the equipment is expensive, the arrangement quantity, the position and the depth of the particles in unit area and the size and the distribution of the non-sticky solid particles are strictly limited, and the production efficiency and the productivity are necessarily influenced by the high-precision process requirement; 2. the solid particles are large in size, generally 10-60 mu m, so that the solid particles can be pressed into the adhesive layer by large pressure to build the bonding strength, and the construction efficiency is influenced to a certain degree.

CN110343475A discloses a low-tack high-tack paint surface protective film, the formula of the pressure-sensitive adhesive layer of the protective film is as follows: crystalline hydroxyl polyurethane resin, polyol resin, tackifying resin, a cross-linking agent, an ultraviolet absorbent and an antioxidant. The protective film prepared by the method has the performances of low initial adhesion, high permanent adhesion and the like, and can solve the problem that the film pasting construction is not utilized due to the overlarge initial adhesion of the pressure-sensitive adhesive layer of the protective film. The technical scheme has the following defects: 1. the reduction of initial adhesion does not mean complete absence of initial adhesion, repeated tearing and sticking are still needed during film sticking, the construction efficiency is influenced, and the adhesiveness is reduced by multiple sticking; 2. the adhesive force is insufficient due to the fact that the initial adhesive force is reduced through formula adjustment, instant adhesion cannot be completed after construction of the alignment position, and poor adhesion causes the phenomena of adhesive loss, edge warping and the like of the adhesive film; 3. the initial adhesion is reduced through formula adjustment, so that the hardness of the adhesive is increased, the adhesive base force is reduced, and the adhesive is easy to come unstuck when repeatedly torn and pasted.

Therefore, the development of an adhesive film with a high peeling force and a zero initial adhesion force, which is simple and efficient in manufacturing process, convenient and effective to apply, has become an urgent problem to be solved in the fields of advertising, decoration and the like, and has great significance.

Disclosure of Invention

In order to solve the problems, the invention aims to provide an adhesive film with zero initial adhesion and high peeling force; the preparation process of the adhesive film is simple, the film pasting process is easy to operate, and the reworking property is good; can be widely applied to advertising, decoration and fitment. The semi-exposed solid particles in the adhesive layer and the copying function of the semi-exposed solid particles and the frosted grid release layer enable the solid particles in the adhesive layer to be more stably and orderly kept in a semi-exposed state before being pasted. When pasting, because of there is stable and orderly half naked dew solid particle and can remove the pad pasting at will on sticky pad pasting surface, until finding accurate pasting position, at last through exerting pressure with the solid particle impress glue in, the glue film produces the contact with the adherend, through dull polish and air guide groove structure exhaust air, finally form the adhesion stress, reach good laminating effect.

In order to achieve the technical purpose, the invention provides an adhesive film which comprises a frosted grid release layer, an adhesive layer and a thin film layer which are sequentially connected, wherein the adhesive layer contains solid particles, the binding surface of the adhesive layer and the frosted grid release layer is provided with a frosted and air guide groove structure, and the other surface of the adhesive layer is connected with the thin film layer.

In some embodiments, the adhesive layer comprises solid particles in an interior and solid particles in a semi-exposed state.

In some embodiments, the abrasive and air-guide channel structure of the adhesive layer is formed by semi-exposed solid particles and their replication with the abrasive grid release layer.

In some embodiments, the frosted grid release layer is selected from a release film or a release paper, and the release surface is formed by coating a release agent on the surface of the substrate after atomization and embossing treatment. Preferably, the surface roughness of the frosted grid release layer is Ra 2.5-3.5, the height of the protrusions is 0.5-2 mu m, and the grids are of rhombic, rectangular, square, circular, honeycomb or other shapes of air guide groove structures.

In some embodiments, the release force of the frosted mesh release layer is 5-30 g/25 mm.

In some embodiments, the adhesive layer has a thickness of 0.02 to 0.06 mm.

In some embodiments, the adhesive layer includes 0.5 to 5 parts by weight of solid particles having a particle size of 20 to 1000 nm.

Preferably, the particle size of the solid particles is 20 to 500nm, and the content of the solid particles is 0.5 to 5 parts by weight.

Preferably, the particle size of the solid particles is 20-300 nm, and the content of the solid particles is 1.5-3 parts by weight.

Preferably, the particle size of the solid particles is 100-300 nm, and the content of the solid particles is 2-3 parts by weight.

Preferably, the solid particles have a particle size of 200nm and a content of the solid particles is 2.5 parts by weight.

Preferably, the adhesive layer further comprises 100 parts by weight of an adhesive.

In some embodiments, the solid particles are selected from one or more of the following: alumina, silicon oxide, titanium oxide, calcium carbonate, barium carbonate, iron oxide, polystyrene, polymethyl methacrylate, polypropylene, polyethylene, melamine, and phenol resin.

Preferably, the solid particles are polymethylmethacrylate resin particles.

In some embodiments, the film layer is selected from the group consisting of a PVC film, a PP film, a PE film, a PS film, and has a thickness of 0.03 to 0.15 mm.

The invention also provides a method for preparing the adhesive film, which comprises the following steps:

(1) pre-dispersing solid particles: adding the solid particles into a solvent and dispersing at a high speed to obtain a uniformly mixed solid particle dispersion liquid;

(2) adhesive preparation: mixing a polymer, tackifying resin, a cross-linking agent and a solvent according to a certain proportion, and dispersing at a high speed to obtain an adhesive;

(3) preparation of adhesive masking liquid: adding the solid particle dispersion liquid into an adhesive, and dispersing at a high speed to obtain an adhesive coating liquid;

(4) adhesive layer coating: coating the adhesive coating liquid on the surface of the film layer, and drying to obtain an adhesive layer, wherein part of solid particles are in a semi-exposed state;

(5) preparing a frosted grid release layer: carrying out atomization embossing treatment on the surface of a substrate for release, and then coating a release agent to form a release surface;

(6) preparing an adhesive film: and (3) attaching the surface of the adhesive layer with the semi-exposed solid particles to the release surface of the frosted grid release layer to obtain the adhesive film.

In some embodiments, the solvent is toluene; the particle size of the solid particles is 100-300 nm.

In some embodiments, the adhesive layer has a thickness of 0.02 to 0.06mm, and the film layer has a thickness of 0.03 to 0.15 mm.

The invention also provides application of the adhesive film in advertising, decoration and finishing.

Compared with the prior art, the invention has the beneficial effects that:

(1) the glue layer and the adherend are isolated by the particles, and expensive particle arrangement equipment and a strict process control process are required in the prior art; the preparation process of the adhesive film provided by the invention is simple, only a normal production mode is needed, and no additional equipment is needed on a coating line, so that the cost is greatly reduced.

(2) In the prior art, non-sticky solid particles with large particle sizes are needed, and the non-sticky solid particles can be implanted into glue only by using larger pressure during construction, so that the working efficiency is influenced to a certain extent; the invention uses nano-scale small-particle-size particles, achieves good isolation effect, can complete implantation by using smaller pressure, and has smoother operation.

(3) According to the invention, through the copying action of the semi-exposed solid particles in the adhesive layer and the frosted grid release layer, the solid particles in the adhesive layer can be more stably and orderly kept in a semi-exposed state before being pasted, so that a better zero initial adhesion effect can be realized during pasting.

(4) Most of adhesive films reduce initial adhesion by adjusting the formula of the glue, pressure-sensitive glue with higher hardness needs to be designed and synthesized, peeling force and adhesive base force are finally sacrificed, and higher quality hidden danger exists; the invention can meet the requirement of zero initial adhesion only by depending on structural design, and the provided adhesive has higher stripping force and cohesive property and excellent comprehensive performance.

(5) The adhesive layer provided by the invention has a frosted effect and is additionally provided with a rhombic, rectangular, square, circular, honeycomb or other-shaped air guide groove structure, so that the air exhaust property of the adhesive layer and an adherend (such as a wall surface, glass and the like) during the attachment can be enhanced, the problem of attachment bubbling of the adhesive film is solved, and the attachment effect is improved.

Drawings

Fig. 1 is a schematic view of an adhesive film according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an adhesive layer according to an embodiment of the invention.

Fig. 3 is an enlarged view of a release layer of a frosted grid used in an embodiment of the present invention.

Fig. 4 is a microscopic enlarged view of the joint of the adhesive layer and the frosted grid release layer according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a venting test performed in accordance with an embodiment of the present invention.

1: film layer, 2: adhesive layer, 211: semi-bare solid particles, 212: inner solid particles, 22: adhesive, 3: dull polish net is from type layer, 31: grid groove, 32: frosted area, 51: template, 52: film sample, 53: the thumb.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below. Unless otherwise indicated, reagents, materials and equipment used in the following examples are all available by conventional commercial means. And it should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The scope of the present application is not limited to the embodiments, and the claims are to be read in this light. For purposes of clarity and understanding by one of ordinary skill in the art, the components shown are not necessarily drawn to scale relative to each other, some dimensions may be exaggerated relative to other dimensions, and irrelevant or unimportant details may not be fully drawn for clarity of illustration.

The invention provides an adhesive film, which comprises a frosted grid release layer 3, an adhesive layer 2 and a film layer 1 which are sequentially connected as shown in figure 1.

The frosted grid release layer 3 is made of release materials, one surface of the frosted grid release layer is subjected to atomization embossing treatment and then coated with a release agent to form a release surface, and the release surface can be in a regular rhombic, rectangular, square, circular, honeycomb or other grid-shaped structure. Preferably, the release material may be a release film such as PET, PE, PP, etc. or PE laminated release paper. The surface roughness of the release layer of the frosted grid is Ra 2.5-3.5, the surface grid is preferably in a rhombic structure, and the height of the protrusions is 0.5-2 mu m. The release force of the sand grinding grid release layer is preferably 5-30 g/25 mm.

Fig. 2 is a schematic view of the adhesive layer 2. As shown in FIG. 2, the adhesive layer 2 contains solid particles, preferably consisting of an adhesive 22, semi-exposed solid particles 211 and internal solid particles 212, and has a thickness of 0.02 to 0.06 mm. In a preferred adhesive layer, the adhesive is present in an amount of 100 parts by weight, and the solid particles are present in an amount of 0.5 to 5 parts by weight, preferably 1.5 to 3 parts by weight, more preferably 2 to 3 parts by weight, and most preferably 2.5 parts by weight. The adhesive can be prepared from 100 parts by weight of polymer, tackifying resin, a cross-linking agent and a solvent, wherein the weight-average molecular weight range of the polymer is 50-150 ten thousand, and the glass transition temperature is-60 ℃ to-30 ℃; the content of the tackifying resin can be 10 to 50 parts by weight, and preferably 20 parts by weight; the content of the crosslinking agent is 0.05 to 2 parts by weight, preferably 1 part by weight. The solid particles can be solid, hollow or porous spheroids or spherical or irregular polygonal structures, and have a particle size of 20-1000 nm, preferably 20-500 nm, more preferably 20-300 nm, more preferably 100-300 nm, and most preferably 200 nm. The solid particles may be inorganic solid particles such as alumina, silica, titania, calcium carbonate, barium carbonate, iron oxide, or the like; or an organic solid resin such as polystyrene, polymethyl methacrylate, polypropylene, polyethylene, melamine, phenol resin, or the like. Preferably, the solid particles are polymethylmethacrylate resin particles.

Fig. 4 is a microscopic enlarged view of the joint of the adhesive layer 2 and the frosted grid release layer 3. As shown in fig. 4, the surface of the adhesive layer 2, which is attached to the frosted grid release layer 3, has a frosted and air-guiding groove structure, and the inside of the surface contains solid particles 212, and the surface has semi-exposed solid particles 211. The other side of the adhesive layer 2 is connected to the film layer, preferably fixed to the surface of the film layer by coating. The frosted and air guide groove structure on the adhesive layer 2 is formed by the solid particles in a semi-naked state and the copying function of the solid particles and the frosted grid release layer 3; the structure of the frosted spots 32 and the grid grooves 31 of the frosted grid release layer 3 as shown in fig. 3 can be copied on the adhesive layer 2 to form the frosted and air guide groove structure of the adhesive. Fig. 3 is an exemplary frosted and grid air guide channel structure having both grid channels 31 and frosted areas 32. The grid shape can be a regular diamond shape, the length of a diagonal line is 445 micrometers, the width of the air guide groove is 42 micrometers, and the depth is 5-15 micrometers.

The film layer is made of a PVC film, a PP film, a PE film, a PS film or other suitable materials, and is preferably a casting-grade PVC soft film. The thickness of the film layer is 0.03-0.15 mm, preferably 0.04-0.09 mm. The film layer is formed by coating on the support film and can be used as a printing surface, and patterns and characters can be printed on the surface of the film layer by color digital printing or traditional screen printing and other modes.

During the use with the dull polish net in the sticky pad pasting detach from type layer 3, remove the pad pasting until finding accurate sticking position, then through exerting pressure with half naked state solid particle impressing glue in, the air is discharged through the air guide groove on adhesive layer 2, the glue film with the adherend contact glue firmly can.

(1) pre-dispersing solid particles: adding solid particles of 20-1000 nm, preferably 100-300 nm into a suitable solvent, preferably toluene, and dispersing at a high speed to obtain a uniformly mixed solid particle dispersion liquid;

(4) adhesive layer coating: coating the adhesive coating liquid on the surface of a thin film layer with the thickness of 0.03-0.15 mm, and drying to obtain an adhesive layer with the thickness of 0.02-0.06 mm, wherein part of solid particles are in a semi-exposed state;

(5) preparing a frosted grid release layer: atomizing and embossing the surface of a substrate for release, such as the surface of a PET film, and then coating a release agent to form a release surface;

Preferably, the coating can be carried out using comma blade coating equipment and the drying can be carried out in an oven under suitable conditions. The release surface may be in a regular diamond configuration.

The adhesive film can be widely applied to advertising, decoration and the like.

The method for preparing the frosted grid release layer 3 can comprise the following steps:

(1) the method comprises the following steps that a film such as PET, PE, PP or the like or a paper substrate is subjected to PE film coating and then is conveyed to a hot pressing area through a conveying roller, the hot pressing area is provided with an upper heating roller and a lower heating roller, and the surface of the upper heating roller is provided with a reverse-engraving frosted grid structure;

(2) heating at the roller temperature of 120-180 ℃, enabling the upper heating roller and the lower heating roller to interact to press the film base material or the film coated paper, and carrying out atomization embossing treatment, so that the structure on the reverse-engraving frosted mesh roller is transferred to the surface of the film or the paper, and the surface is in a frosted mesh structure;

(3) and coating a release agent, preferably an organic silicon release agent, on the surface of the frosted grid structure to obtain a PET, PE or PP frosted grid release film, or PE drenched frosted grid release paper as a frosted grid release layer 3.

Preparation example of adhesive film

The adhesive film is prepared by the following steps:

(1) adding polymethyl methacrylate resin particles with the particle size of 200nm into toluene and dispersing at a high speed of 2500rpm for 5min to obtain a uniformly mixed polymethyl methacrylate resin dispersion liquid.

(2) 100 parts by weight of modified acrylate pressure-sensitive polymer PS-8231 (Qunshan chemical engineering), 20 parts by weight of rosin resin D-125 (Mitsugao chemical engineering), 1 part by weight of isocyanate crosslinking agent (Corstewa corporation) and a proper amount of toluene are mixed, and the mixture is dispersed at a high speed of 2500rpm for 5min to obtain the adhesive.

(3) Adding the polymethyl methacrylate resin dispersion liquid into the adhesive, and dispersing at a high speed of 2500rpm for 5min to obtain an adhesive coating liquid, wherein the adhesive content is 100 parts by weight, and the polymethyl methacrylate resin particle content is 0.5 part by weight.

(4) Coating the adhesive coating liquid on the surface of a casting-grade PVC soft film layer by using comma scraper coating equipment, and drying the coating liquid in an oven (110 ℃/2min) to obtain the adhesive layer. Fig. 2 shows a schematic diagram of an adhesive layer formed after the adhesive coating liquid is dried by an oven, wherein a part of the polymethyl methacrylate resin particles is in a semi-exposed state, and a part of the polymethyl methacrylate resin particles is deeply buried in the adhesive. The thickness of the adhesive layer is 0.035mm, the film layer is coated on the support film for forming, the thickness of the film layer is 0.05mm, the film layer can be used as a printing surface, and the surface can be printed with patterns and characters by color digital printing or traditional screen printing and other modes.

(5) And carrying out atomization embossing treatment on the surface of the PET film, and then coating an organic silicon release agent to enable the surface of the obtained release layer to have a frosted and regular rhombic structure. Fig. 3 shows a microscopic magnification of the release layer of the frosted grid. The grid shape can be a regular diamond shape, the length of a diagonal line is 445 micrometers, the width of the air guide groove is 42 micrometers, and the depth is 5-15 micrometers.

(6) And (3) attaching the adhesive layer of the adhesive layer to the release surface of the frosted grid release layer to obtain the adhesive film of the embodiment 1. After the adhesive layer is attached to the release layer, an air guide groove can be formed on the surface of the adhesive layer, so that the air exhaust performance of the adhesive layer and an object to be attached (such as a wall surface, glass and the like) during attachment can be enhanced, the problem of attachment foaming is solved, and the attachment effect is improved. Fig. 4 shows a microscopic magnification of where the adhesive layer is attached to the frosted grid release layer.

When the film needs to be pasted, the support film on the surface of the film layer is torn off, and then pasting application can be carried out.

Adhesive films of examples 2 to 13 were prepared by adjusting only the content (adjustment range: 0.5 to 5 parts by weight) and/or the particle diameter (20 to 1000nm) of the polymethyl methacrylate resin particles in a manner similar to that of example 1. The adhesive patch of example 14 was prepared by a method similar to example 1, omitting the above steps (1) and (3).

The adhesive films of comparative examples 1 to 4 were prepared by adjusting the content of the polymethylmethacrylate resin particles (adjustment range: 0 to 2.5 parts by weight, when the content was 0, the above steps (1) and (3) were omitted) and/or the particle size (no particles; or the particle size was 200nm) and/or the selection of the release layer (when the release layer was a smooth release film, the above step (5) was omitted; when the release layer was a frosted release film, the above step (5) was adjusted to only the atomization treatment; when the release layer was a grid release film, the above step (5) was adjusted to only the embossing treatment) by a method similar to that of examples 1 to 14, respectively.

Specific parameters during the preparation of examples 1-14 and comparative examples 1-4 are shown in the following table:

performance testing

The following tests were carried out on the adhesive film samples of examples 1 to 14 and comparative examples 1 to 4 described above, respectively:

1. peel force test

The peel force is an indication of the amount of adhesion between the film and the adherend, and is measured according to ASTM D3330. The sample was cut to 25mm width and 150mm length. The mixture was allowed to stand at a temperature of 23 ℃ and a humidity of 50% RH for at least 2 hours. The test sample was attached to a cleaned standard steel plate and pressed back and forth once with a 2kg press roller. The sheet was peeled off at a peeling angle of 180 ℃ and a peeling speed of 300mm/min by using a peeling force measuring apparatus (Instron type tensile tester, Shimadzu corporation), and a 180 ℃ peeling force value was measured. The average value of N-3 was defined as the measurement value.

2. Initial adhesion test

The initial adhesion can represent the instant adhesion generated by the transient contact of the adhesive film and an adherend, and is measured according to the method of ASTM D6195. The sample was cut to 25mm width and 200mm length. The mixture was allowed to stand at a temperature of 23 ℃ and a humidity of 50% RH for at least 2 hours. Bending the test sample to form a ring, clamping the overlapped part on an upper clamp of the instrument, and clamping the cleaned test plate on a lower clamp, wherein the radial direction of the test plate is perpendicular to the radial direction of the adhesive tape. After the ring tape was lowered at 300mm/min to contact the test board and completely contacted (contact area 25 mm. times.25 mm), the ring tape was immediately raised at 300mm/min to separate from the test board by "Start", and data of the test was recorded. The average value of N-3 was defined as the measurement value.

3. Retention force test

The determination was made according to ASTM D3654 to test the retention/cohesion of the samples. The sample was cut to 25mm width and 150mm length. The mixture was allowed to stand at a temperature of 23 ℃ and a humidity of 50% RH for at least 2 hours. The test sample was attached to a cleaned standard steel plate and pressed back and forth once with a 2kg press roller. Keeping the attaching area at 25mm multiplied by 25mm, hanging a weight of 1kg, keeping the tape in an oven at 70 ℃ for 3 days, observing and recording whether the tape has displacement and the displacement distance.

4. Residual gum resistance test

The sample was cut into a width of 20mm and a length of 150mm, attached to a standard steel plate, and pressed once back and forth with a 2kg roller. After standing for 1 hour under standard laboratory conditions, the mixture was put into an oven at 85 ℃ and 85% RH for 24 hours and then taken out. After the sample is placed under standard laboratory conditions and is kept stand for 1 hour, the adhesive tape is quickly peeled off, and whether residual adhesive exists on the surface of the plate or not is observed and recorded so as to test the adhesive force.

5. Test of air discharge Property

A51 mm by 127mm sample plate 51 was prepared, and a spherical concave area having a size of 16mm in diameter and 1mm in depth was dug on the sample plate 51. A film sample 52 having a size of 50mm X50 mm was cut out, and the film 52 was adhered to a sample plate 51 with care taken not to press the film into the concave area. As shown in fig. 5, the film sample 52 is pressed uniformly into the depression with the thumb 53, and sufficient pressure is applied until it is confirmed that the residual blister has reached the minimum dimensional requirement or has completely disappeared, as follows: the application of pressure ensures that the bubbles are present or disappear inside the depressions and no visible bubbles are transferred to the outside of the depressions. If the bubbles disappear completely, the product is qualified, and if any obvious bubbles remain in the concave part, the product is not qualified.

The results of the performance test of the adhesive film samples of examples 1 to 14 and comparative examples 1 to 4 are shown in the following table:

as can be seen from the test results of examples 1-14 and comparative examples 1-4 shown in the above table:

the embodiments 1 to 14 of the invention all use the frosted grid release layer, and the release layer has a frosted structure and a grid air guide groove structure, which can provide good air exhaust performance. Even example 14, which contained no solid particles, had a lower initial adhesion due to the structure of the frosted mesh release layer and other properties were good. In addition, the adhesive layers of the examples 1-13 all have solid particles with the content range of 0.5-5 parts by weight and the particle size range of 20-1000 nm, and the schemes of the examples 1-13 have the comprehensive properties of good air exhaust, low initial adhesion, higher peeling force, better holding force and the like. Preferably, the content range of the solid particles is 0.5-5 parts by weight, the particle size range is 20-500 nm, and the initial adhesion of the adhesive is less than 6.5N/in; further preferably, the content range of the solid particles is 0.5-3 parts by weight, the particle size range is 20-500 nm, and the initial adhesion of the adhesive is less than 6.5N/in; further preferably, the content range of the solid particles is 1.5-3 parts by weight, the particle size range is 20-300 nm, and the initial adhesion of the adhesive is less than 3.2N/in; more preferably, the content range of the solid particles is 2-3 parts by weight, the particle size range is 100-300 nm, and the initial adhesion of the adhesive is less than 2.2N/in; most preferably, the adhesive film of example 5 has the best overall performance, with a peel force of 14.8N/in, an initial adhesion of 0N/in, good cohesion (displacement distance of only 0.2mm in the retention test), good residual glue resistance, no risk of degumming, and good air release.

The adhesive layer of comparative example 1 was free of nano-solid particles, and the release film used was the most popular glossy release film on the market. Compared with the examples 1-14, the adhesive surface is smooth and flat, no solid particles are protruded, so that the adhesive surface can be fully contacted with an adherend, and the initial adhesion value reaches the highest value. And the adhesive surface of comparative example 1 has no air guide groove, so that the air release property is poor.

The release film used in comparative example 2 is the most popular glossy release film on the market. Compared with examples 1-14, the adhesive surface is smooth and flat, and the solid particles can not protrude out of the surface, so that the adhesive surface can be fully contacted with an adherend, and the initial adhesion value is higher. And the adhesive surface of the comparative example 2 has no air guide groove, and the prepared adhesive film has poor air exhaust.

The release film used in comparative example 3 had no embossed structure. The adhesive side of comparative example 3 had no air-guiding groove and the produced adhesive film had poor air release properties, although high peel strength, zero initial tack and good holding power were achieved as compared with examples 1 to 14.

The adhesive film of comparative example 4 has a good air release property due to the use of the mesh release film, but compared with examples 1 to 14, the adhesive surface is smooth and flat due to the non-frosted structure, so that solid particles cannot protrude from the surface, sufficient contact between the adhesive surface and an adherend can be formed, and the initial adhesion value is high.

The adhesive film provided by the invention is combined with formula adjustment by virtue of structural design, and can realize high peeling force, zero initial adhesion force, and good comprehensive performance of retention force, residual adhesive resistance and air release. The frosted and grid structure of the frosted grid release paper and the solid particles with specific particle size and content are important factors for the adhesive film to exert the best performance. Because of the good mobility of adhesive, through the reproduction effect on dull polish net release layer, make the glue film also form unevenness's dull polish structure, reach the purpose that reduces glue film and adherend area of contact, can reduce the initial adhesion of sticky pad pasting by a wide margin. And the surface bulges are hidden in the concave surface space of the frosted grid release layer, the semi-naked state of the solid particles is kept, the adhesive layer and the adhered object are isolated through the particles, and the effect of zero initial adhesion is achieved. During the use with the dull polish net in the sticky pad pasting detach the type layer, remove the pad pasting until finding accurate sticking position, then through exerting pressure with solid particle impressing glue in, the air is discharged through the air guide groove that the grid structure formed, the glue film with the adherend contact glue firmly can.

It is obvious to the person skilled in the art that the invention is not restricted to the details of the above-described exemplary embodiments; and that the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The utility model provides an adhesive film, its characterized in that, it contains dull polish net that connects gradually from type layer, adhesive layer and thin layer, the adhesive layer contains solid particle, the adhesive layer with dull polish net has dull polish and leads the air duct structure from the binding face on type layer, the another side on adhesive layer with the thin layer is connected.

2. The adhesive film of claim 1 wherein the adhesive layer comprises solid particles in an interior and solid particles in a semi-exposed state.

3. The adhesive film of claim 2 wherein the abrasive and air-guide channel structure of the adhesive layer is formed by replication of the semi-exposed solid particles and the abrasive mesh release layer.

4. The adhesive film of claim 1, wherein the frosted grid release layer is selected from a release film or a release paper, and the release surface is formed by applying a release agent on the surface of the substrate after the substrate is subjected to atomization and embossing treatment.

5. The adhesive film of claim 4, wherein the frosted grid release layer has a surface roughness of Ra 2.5-3.5 and a height of protrusions of 0.5-2 μm, and the grid has a structure of rhombic, rectangular, square, circular, honeycomb or other air guide grooves.

6. The adhesive film of claim 1, wherein the release force of the frosted mesh release layer is 5-30 g/25 mm.

7. The adhesive film according to claim 1, wherein the thickness of the adhesive layer is 0.02 to 0.06 mm.

8. The adhesive film according to claim 1, wherein the adhesive layer comprises 0.5 to 5 parts by weight of the solid particles and has a particle diameter of 20 to 1000 nm.

9. The adhesive film according to claim 8, wherein the solid particles have a particle size of 20 to 500nm and are contained in an amount of 0.5 to 5 parts by weight.

10. The adhesive film according to claim 8, wherein the solid particles have a particle size of 20 to 300nm and are contained in an amount of 1.5 to 3 parts by weight.

11. The adhesive film according to claim 8, wherein the solid particles have a particle size of 100 to 300nm and the content of the solid particles is 2 to 3 parts by weight.

12. The adhesive film according to claim 8, wherein the solid particles have a particle size of 200nm and the content of the solid particles is 2.5 parts by weight.

13. The adhesive film of claim 8, wherein the adhesive layer further comprises 100 parts by weight of an adhesive.

14. The adhesive film of claim 1, wherein the solid particles are selected from one or more of the following: alumina, silicon oxide, titanium oxide, calcium carbonate, barium carbonate, iron oxide, polystyrene, polymethyl methacrylate, polypropylene, polyethylene, melamine, and phenol resin.

15. The adhesive film according to claim 14, wherein the solid particles are polymethylmethacrylate resin particles.

16. The adhesive film according to claim 1, wherein the film layer is selected from the group consisting of a PVC film, a PP film, a PE film, and a PS film, and has a thickness of 0.03 to 0.15 mm.

17. A method of making the adhesive film of claim 1, comprising the steps of:

(3) preparation of adhesive masking liquid: adding the solid particle dispersion liquid into the adhesive, and dispersing at a high speed to obtain the adhesive coating liquid;

(4) adhesive layer coating: coating the adhesive coating liquid on the surface of a film layer, and drying to obtain an adhesive layer, wherein part of the solid particles are in a semi-exposed state;

(6) preparing an adhesive film: and (3) fitting one surface of the adhesive layer with the semi-exposed state solid particles with the release surface of the frosted grid release layer to obtain the adhesive film.

18. The method of claim 17, wherein the solvent is toluene; the particle size of the solid particles is 100-300 nm.

19. The method of claim 17, wherein the adhesive layer has a thickness of 0.02 to 0.06mm and the film layer has a thickness of 0.03 to 0.15 mm.

20. Use of the adhesive film of claim 1 for advertising and finishing.