CN113817420B

CN113817420B - High-strength label tape, and preparation method and application thereof

Info

Publication number: CN113817420B
Application number: CN202111174657.6A
Authority: CN
Inventors: 陈信宏; 刘诗蓉
Original assignee: Taicang Jin Yu Electronic Materials Co ltd
Current assignee: Taicang Jin Yu Electronic Materials Co ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2023-02-28
Anticipated expiration: 2041-10-09
Also published as: CN113817420A

Abstract

The invention discloses a high-strength label tape and a preparation method thereof. The high-strength label adhesive tape comprises a matte black printing layer, a film layer, a composite adhesive layer, a stainless steel layer, a first adhesive layer, an acrylic foam layer, a second adhesive layer and a release layer which are sequentially arranged; the film layer is made of polyethylene terephthalate; the composite adhesive layer is made of a combination of an acrylic adhesive and rosin resin; the stainless steel layer is made of 430 stainless steel. The high-strength label tape has a low thickness value, can meet the requirement of limited space for adhesion, has printability, can ensure good adhesive force, does not warp after adhesion, and is not easy to break or fall off.

Description

High-strength label tape, and preparation method and application thereof

Technical Field

The invention relates to the technical field of adhesive tape processing, in particular to a high-strength label adhesive tape, and a preparation method and application thereof.

Background

At present, all smart phones are touch-control type, and a touch-control motor module is contained in the smart phones. Most parts in the touch control motor module are formed by welding iron pieces. And the welding process is adopted, so that the product is poor in attractiveness. And replace welding process with high strength label tape, paste fixedly the ironware in the touch-control motor module, can improve the pleasing to the eye degree of product.

Most of the existing high-strength label tapes are polyester film tapes, and if the existing polyester film tapes are adopted to replace a welding process, the problems of insufficient material strength and adhesive strength of the tapes and the like can be faced. Especially, on the premise that the internal space of the mobile phone is limited and the thickness of the high-strength adhesive tape is required, the high-strength adhesive tape in the prior art is difficult to meet the requirement.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a high-strength label tape and a preparation method thereof, wherein the high-strength label tape is low in thickness value, can meet the requirement of pasting in a limited space, has a printable performance, realizes the pasting and fixing of a motor module in a bending mode, can ensure good adhesive force and no tilting after pasting, and is not easy to break or fall off.

The invention discloses a high-strength label tape, which comprises a matte black printing layer, a thin film layer, a composite adhesive layer, a stainless steel layer, a first adhesive layer, an acrylic foam layer, a second adhesive layer and a release layer which are sequentially arranged;

wherein the content of the first and second substances,

the film layer is made of polyethylene terephthalate;

the composite adhesive layer is made of a combination of an acrylic adhesive and rosin resin;

the stainless steel layer is made of 430 stainless steel.

The setting of mute black printing layer makes the surface of high strength label sticky tape present even mute black to possess the printable performance. The matte black printing layer preferably includes a black ink layer and a varnish layer. The black ink layer is arranged on the film layer side. In other words, the gloss oil layer is arranged on one side surface of the black ink layer, which is opposite to the thin film layer, namely the black ink layer is arranged between the gloss oil layer and the thin film layer. The black ink layer enables the high-strength label tape to have good shielding performance, and the gloss oil layer can play a role in surface layer protection, scratch resistance and dirt resistance. Preferably, the thickness of the black ink layer is 1.6 to 2 μm, and the thickness of the gloss oil layer is 2 to 3 μm.

The film layer is polyethylene terephthalate. Preferably, the thin film layer has a thickness of 1.5 to 2.5 μm, preferably 2 μm. The matte black color is achieved through a printing process, and the high requirements of printing on the flatness and wetting tension of the surface of the material can be met by adopting polyethylene terephthalate (PET). Meanwhile, the thickness of the polyethylene terephthalate (PET) film can be extremely ultra-thin, and the limitation of the whole thickness and space of the high-strength label tape can be met.

The composite adhesive layer is used for bonding the film layer and the stainless steel layer. Preferably, in the combination of the acrylic adhesive and the rosin resin for preparing the composite layer, the addition amount of the rosin resin accounts for 0.5-1.7% of the mass of the acrylic adhesive, and more preferably accounts for 1.7%.

The first adhesive layer, the acrylic foam and the second adhesive layer are compounded to form an adhesive layer for bonding the stainless steel layer and the release layer.

Preferably, the sum of the thicknesses of the acrylic foam layer, the first adhesive layer and the second adhesive layer is 100-250 μm, and preferably 150 μm.

Preferably, the thickness of the acrylic foam layer is 75-200 μm, and more preferably 100 +/-5 μm.

Preferably, the first adhesive layer and the second adhesive layer are respectively made of a combination of acrylic adhesive and rosin resin, the thickness of the first adhesive layer is 22-28 μm (preferably 25 μm), and the thickness of the second adhesive layer is 22-28 μm (preferably 25 μm). Preferably, in the combination of the acrylic adhesive and the rosin resin for preparing the first adhesive layer and the second adhesive layer, the addition amount of the rosin resin is 0.5 to 1.7 percent, more preferably 1.7 percent, of the mass of the acrylic adhesive.

The high-strength label tape has high requirements on material strength because the original welding process is replaced, and stainless steel materials are generally used for manufacturing part stamping and the like instead of being used for coating the tape. In design, the performance required by the selected material is analyzed according to the product requirements and the practical application conditions, and the materials are arranged according to the importance in sequence: thickness, tensile strength, hardness value, ductility and die cutting processability, and finally abandons the selection of the traditional glass fiber cloth and woven cloth, changes the selection to the direction search of metal materials, even considers the metal material stainless steel which is not the conventional use in the coating industry, and takes the stainless steel grade 430 as the optimal selection through a plurality of self-made test evaluations. Preferably, the thickness of the stainless steel layer is 8 to 12 μm.

Preferably, the thickness of the release layer is 70-80 μm, the residual rate of a release film adopted by the release layer is more than or equal to 80%, and the release force is 5-15 g/in.

Preferably, the total thickness of the high-strength label tape provided by the invention is 150-320 μm, and more preferably 170 +/-5 μm.

The invention also provides a preparation method of the high-strength label tape, the preparation method preferably adopts a short-version type multilayer laminating machine, the length of the short-version type multilayer laminating machine is preferably 2m, and the preparation method can also adopt other multilayer laminating machines for preparation;

the short-version multilayer laminating machine comprises a discharging shaft, a laminating wheel and a winding shaft; wherein:

the discharging shaft is arranged on the head-end discharging frame and comprises three discharging shafts which are respectively positioned above, below and in front;

the discharging shaft is provided with a motor type edge aligning machine, and the distance between the head end discharging frame and the attaching wheel is preferably 1.4m;

the fitting wheel comprises an upper shaft and a lower shaft, and the lower shaft is a stainless steel mirror wheel (the diameter is preferably 80 mm); the upper shaft is a silica gel wheel (the diameter is preferably 80 mm), the thickness of the silica gel layer is preferably 20mm, and the Shore A hardness is preferably 70;

the distance between the winding shaft and the attaching wheel is preferably 45cm.

The preparation of the high-strength label adhesive tape by adopting the short-version type multilayer laminating machine comprises the following steps:

placing the thin film layer printed with the matte black printing layer on a first discharging shaft above, placing the stainless steel layer on a second discharging shaft below, and using a third discharging shaft in front for stripping the release film on the thin film layer printed with the matte black printing layer; wherein, the discharging tension of the upper first discharging shaft is 0.5-1N, the discharging tension of the lower second discharging shaft is 5-8N, and the machine speed is preferably 7-10m/min (more preferably 8 m/min);

compounding the thin film layer printed with the matte black printing layer and the stainless steel layer through a middle laminating wheel, and then rolling by a rolling shaft to obtain a matte black metal composite film;

the method comprises the following steps of compounding a first adhesive layer, an acrylic foam layer, a second adhesive layer and two release layers in advance to obtain an acrylic foam double-sided tape, wherein the two release layers are respectively arranged on two sides of the acrylic foam double-sided tape, one release layer is peeled off in the preparation process, and the other release layer is peeled off before use;

placing the acrylic foam double-sided tape on a first discharging shaft above, placing the intermediate product on a second discharging shaft below, wherein a third discharging shaft in front is used for stripping a release film on one side of the acrylic foam double-sided tape; wherein, the discharging tension of the upper first discharging shaft is 2-4N, the discharging tension of the lower second discharging shaft is 5-8N, and the machine speed is preferably 7-10m/min (more preferably 8 m/min);

and compounding the acrylic foam double-sided tape and the matte black metal composite film through an intermediate laminating wheel, and then rolling by a rolling shaft to obtain the high-strength label tape.

Preferably, the preparation of the film layer printed with the matte black printing layer is performed in the following manner: adopting micro gravure printing and coating, setting a machine speed to be 30m/min, sequentially printing a black ink layer and a gloss oil layer on the surface of the film layer, and curing to obtain a matte black printing film, namely the film layer printed with the matte black printing layer, wherein the black ink layer is printed twice;

preferably, the preparation of the acrylic foam double-sided tape is carried out in the following way: and (3) adopting transfer coating, setting the machine speed to be 25m/min, coating a second adhesive layer on the surface of the first release film, curing, and then compounding the acrylic foam layer, the first adhesive layer and the second release film to obtain the acrylic foam double-sided adhesive tape. Before use, the first release film is peeled off first.

The invention has the following beneficial effects:

the high-strength label tape has a low thickness value, and can meet the requirement of limited space. The surface of the high-strength label tape is uniform, matte and black, has the printing performance, can ensure good adhesion, can be bent at an angle of 90 degrees and is adhered with the motor module, the motor module does not tilt after being adhered, can be smoothly coated on the surface of an iron block, perfectly covers a gap part, and has no collapse during visual observation. The high-strength label tape has label strength which can ensure that the high-strength label tape does not break or fall off when a product is impacted.

The high-strength label tape is produced by adopting a single-layer multi-time compounding process, a matte black printing film tape and an acrylic foam double-sided tape are respectively produced in advance, the matte black printing film tape, the SUS430 and the acrylic foam double-sided tape are respectively compounded according to a set sequence, in the compounding process, the matte black printing film tape and the SUS430 are firstly laminated to obtain a matte black printing film metal material, and then the matte black printing film metal material is compounded with the acrylic foam double-sided tape, so that the phenomena of wrinkling, deformation, curling and tilting can be avoided.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of the structure of a high-strength adhesive tape for labeling in example 1 of the present invention;

reference numerals of the above figures: 1-matte black printing layer, 2-thin film layer, 3-composite glue layer, 4-stainless steel layer, 5-first glue layer, 6-acrylic foam layer, 7-second glue layer and 8-release layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

The invention provides a high-strength adhesive tape for sticking and fixing a pair of iron blocks in a touch motor module, which has the following hard indexes:

(1) The surface of the adhesive tape needs to present uniform matte black and have the printing performance;

(2) The iron block wrapped by the adhesive tape has two 90-degree folding angles, and good adhesive force is required to be ensured not to be tilted;

(3) The adhesive tape is required to be flatly coated on the surface of the iron block, perfectly covers the gap part, and cannot collapse visually;

(4) The overall material strength needs a reliable "drop test" to ensure that the successive tapes of the metal sheet cannot break or fall off when the product is impacted.

In this regard, the present invention has been carried out as follows:

1. printed matte black film

The matte black color is required to be achieved by a printing process, and the printing process has high requirements on the flatness and the surface energy of the material surface. Furthermore, the material needs to have good softness since two 90 ° folds are involved in the application. In contrast, the present invention compares the materials of the matte black film, and specifically, as shown in table 1:

the dimensional accuracy of the material needs to be evaluated by the thickness tolerance value and the surface roughness, and the smaller the numerical value is, the more accurate the numerical value is; the surface energy of the material needs to be evaluated, the basic qualified value needs to reach more than 40 dynes, and the higher the anchoring rate is, the better the anchoring rate is; the softness of the material needs to be evaluated by the elongation at break, and the higher the value is, the softer the material is; the material is flexible but needs to have a certain resistance to deformation and therefore tensile strength is also important, the higher the value, but this is in conflict with the elongation at break and therefore the suitability needs to be evaluated by itself.

TABLE 1

In summary of the above table 1, the present invention selects PET and PA for further testing of printing experiments.

Due to space limitation, the thickness of the coating must be strictly controlled, and the thinner the coating, the more easily the problem of uneven printed lines is reflected. The present invention selects a 360 mesh wheel, and the single layer printing thickness is controlled at 0.8 μm to evaluate the printing performance of PET and PA, and the results are shown in Table 2.

TABLE 2

From the results shown in table 2, it can be seen that: due to the texture relationship, the surface of the polyamide plastic PA is easy to show printing textures, and the final base material is polyethylene terephthalate PET, so that the printing property is good, and the requirements of appearance color and luster, beauty and smoothness can be met after two layers of printing.

2. Stainless steel layer/stainless steel sheet

The research of the invention finds that in order to meet the requirement of bonding and fixing a pair of iron blocks in a touch control motor module, the following materials are required to be adopted: (1) The higher the tensile strength is, the higher the material strength is represented; (2) hardness values, which represent the hardness and the resistance to failure of the material; (3) The cutting property is required to satisfy mass production by cutting with a cutting die or a circular knife.

For this reason, the present invention introduces metal materials and carries out specific comparative experiments, and these metal materials and their properties and processability are shown in table 3.

Among electronic materials, copper foil and aluminum foil are conventional metal materials, and have been widely used due to their excellent surface quality, oxidation resistance and formability. The aluminum foil number 1xxx series is more than or equal to 99 percent pure aluminum, wherein the number 1100 belongs to high hardness in the series because of higher Si/Cu/Mn/Mg content. The 8xxx series is an aluminum alloy with the Si + Fe content of more than or equal to 1 percent, wherein the 8011 series has high hardness due to higher Si/Cu/Mn/Mg content. Both brands are matched to be in the H18 state, namely the full hard state. Through the comparison of the two, the strength and hardness of the aluminum alloy are higher than those of pure aluminum. The copper foil is then used, the grade C1100 is more than or equal to 99% pure copper, and the strength and the hardness of the copper foil are about twice higher than those of the aluminum foil. Stainless steel, which is the highest in tensile strength and hardness among the ultra-thin metal categories, is relatively general in die-cuttability. Through the comparison of the performance and the processability in the first stage, it can be seen that when the hardness 160 of the material is zero, the die-cutting deformation problem is caused when the hardness is more than 160. In consideration of the strength, hardness, breaking resistance, die cutting processability and the like of the comprehensive material, the following four types are selected for carrying out the next-stage test: aluminum 8011h18, copperc1100, sus430, ni200analed, see final structure of fifth section. Wherein the test standard of tensile strength is ASTM D1002-10, the test standard of shearing force is ASTM D1002-10, the test standard of hardness is GB/T7125-2014; the die-cutting ability was visually tested by die-cutting with a 22X 14mm cutter and visually observing the appearance of the samples obtained by die-cutting.

TABLE 3

3. Adhesive

The high-strength adhesive tape for labeling needs to wrap two types of iron blocks, the bonding area is 22mm in length and 14mm in width, and the adhesive tape is provided with two 90-degree folding angles and needs to wrap three surfaces of the adhesive tape. The adhesive tape has small adhesive area and is provided with a folded angle, and the adhesive tape is not layered after passing a drop-resistant test, so the adhesive tape emphasizes initial adhesion, adhesive force and shearing force. In the research and development process, the invention finds that even if the initial adhesion, the adhesive force and the cohesive force of the adhesive are optimized to the greatest extent, the adhesive tape can not withstand the force of external force collision after dozens of drop tests, and the phenomena of displacement, tilting, layering and the like occur. The present invention therefore contemplates incorporation of foam; the softness of the foam can perfectly wrap two 90-degree folding angles, and the shock-absorbing cushion has shock-absorbing buffering performance, can absorb and buffer shock of external force collision in a drop test, and well protects and fixes iron parts to be difficult to separate. After a series of experiments, the acrylic foam adhesive tape is finally selected. The first stage of glue layer research and development: the effect of the adhesive in combination with the rosin resin tackifier is shown in table 4. Wherein the test standard for initial adhesion is PSTC06, the test standard for adhesion and adhesion after 7 days is PSTC101, the test standard for holding power is PSTC107, the test standard for shear force is ASTM D1002-10, and the rebound resistance is tested by visual measurement, and can be tested by referring to the test method for rebound resistance of CN 105121578B.

TABLE 4

And (3) researching and developing a glue layer at the second stage: comparative experiments were conducted on the effect of foam on shock absorption and cushioning properties, and the results are shown in table 5. Wherein, the warping resistance is tested according to a visual measurement method, namely; the compression force was tested according to GB 8813-88. As can be seen from the contents of table 5: acrylic foam is the best choice. The PU foam is extremely soft, has the advantage of excellent shock absorption and buffering performance, but has low material strength and poor damage resistance to external force. The PE foam has moderate softness, and compared with the acrylic foam, the adhesive force and the material strength of the PE foam are lower than those of the acrylic foam.

TABLE 5

Researching and developing a third-stage glue layer: comparative experiments were performed on the structural properties of the acryl foam tape as shown in table 6. As can be seen from table 6: 0.15mm is the best choice. The compression force is limited to 2kg in consideration of shock absorption and cushioning properties.

TABLE 6

4. Preparation process

The most difficult part for producing the high-strength label adhesive tape is to compound multiple layers of materials, and because the thickness of each layer of material is extremely large, the label adhesive tape is easy to wrinkle, deform, curl and tilt during processing and compounding. In the prior art, the method adopted by the multi-layer material compounding is a reinforcing method, namely, a supporting type protective film is compounded with an extremely thin material, the hardness and the stiffness of the material are increased, other layer materials are sequentially superposed on the surface of the extremely thin material, and the supporting type protective film is peeled off after the compounding is finished.

However, the present invention originally attempts to perform the bonding in a "reinforced" manner, i.e. the supporting protective film is first combined with an extremely thin material to increase the hardness and stiffness of the material, so that the material is smoother when combined with another material, and the supporting protective film is peeled off after the combination is completed. However, this process is not suitable for producing this kind of material because each layer of the high strength adhesive tape of the present invention is very thin and the stress generated when the supporting protective film is finally peeled off causes the material to deform and curl. After numerous experiments, the following production process is finally designed, so that the preparation method of the high-strength label tape can avoid the phenomena of folding, deformation, curling and tilting.

1. Laminating machine: because every layer of material all is extremely thin, can not bear too big tensile stretch also can not bear overlength extension, consequently design a length only 2M's "short version type multilayer rigging machine", wherein:

the head end is equipped with 3 baiting axles, can carry out multilayer laminating processing. The discharging shafts are designed to automatically discharge materials and are provided with tension control, and the tension control adopts magnetic powder braking. Have opposite side machine, adjustable range 50mm, enough elasticity reaches the maximize in order to ensure that the effective broad width of laminating material, and limit end precision is steerable at 1mm. The distance between the discharging shaft and the attaching wheel in the middle section is 1.4M, and the material is sufficiently extended but not too long so as to avoid material wrinkles. Different from the design of the traditional pneumatic edge aligning machine, the accuracy of the edge aligning machine is often reduced due to unstable pneumatic control, the edge aligning is misaligned due to excessive shaking of materials, and the stability and the accuracy can be greatly improved by adopting a motor type edge aligning machine designed at this time.

The laminating wheel in middle section is equipped with upper and lower axle. The lower shaft is made of a stainless steel mirror surface wheel with the diameter of 80mm and is made of a stretching material; the upper shaft is a silica gel wheel with the diameter of 80mm, wherein the thickness of the silica gel layer is designed to be 20mm, the hardness is 70, the silica gel wheel with elasticity is used for providing buffer in the attaching process, but the hardness is important in design, if the hardness is too hard, the material is easy to enter air in the attaching process, and if the hardness is too soft, the material is easy to curl and deform in the attaching process.

And a winding shaft is arranged at the rear end, and the materials which are attached are wound. The short distance is 45cm from the applicator wheel and is designed to minimize material stress and stretch to avoid wrinkle curling.

2. A compounding procedure: because each layer of material is very thin, the more difficult it is to control the simultaneous processing of multiple layers of material, the higher the wrinkle crimp defect rate. Therefore, a single-layer multiple composite process is designed:

the first way is that: printing a matte black film adhesive tape composite stainless steel sheet 430: in the head end blowing frame, a first blowing shaft on the upper part places a printed matte black film adhesive tape (namely a matte black printed layer + a film layer + a composite adhesive layer, wherein a release film is arranged on the printed matte black film adhesive tape), a second blowing shaft on the lower part places a stainless steel sheet 430, and a third blowing shaft on the front part winds the release film stripped from the printed matte black film adhesive tape. The discharging tension of the first discharging shaft is controlled to be 0.5-1N, the discharging tension of the second discharging shaft is respectively controlled to be 5-8N, and the machine speed is controlled to be 7-10 m/min. And winding the steel wire to a tail end winding shaft through a middle section laminating wheel, wherein the winding tension is controlled to be 5-8N.

And a second step: the first time of the compound no substrate acryl sticky tape of printing mute black film stainless steel material complex of accomplishing: in the head end discharging frame, a first discharging shaft on the upper part is used for placing a substrate-free acrylic adhesive tape (namely a first adhesive layer + an acrylic foam layer + a second adhesive layer + a release layer, wherein the outer side surface of the first adhesive layer is provided with the release film), a second discharging shaft on the lower part is used for placing a first composite printed matte black thin film stainless steel material, and a third discharging shaft on the front part is used for rolling the release film stripped from the substrate-free acrylic adhesive tape. The discharging tension of the first discharging shaft is controlled to be 2-4N, the discharging tension of the second discharging shaft is controlled to be 5-8N, and the machine speed is controlled to be 7-10 m/min. And winding the film to a tail end winding shaft through a middle section laminating wheel, wherein the winding tension is controlled to be 6-9N.

5. Final structure

Comparative experiments were performed on the combination of the matte black print coating, the metal layer, and the glue layer, and the results are shown in table 7. The printability was tested according to GB13217.7, and the height drop was tested visually, i.e. the samples were dropped from a height of 1m, 2m repeatedly 50 times, 100 times, and the performance of the samples was visually observed.

TABLE 7

As can be seen from the results shown in table 7: preferably, a SUS430 stainless steel layer is used.

Based on the above experiments, the present invention provides the following examples

Example 1

Referring to fig. 1, the embodiment provides a high-strength label tape, which includes a matte black printing layer 1, a film layer 2, a composite adhesive layer 3, a stainless steel layer 4, a first adhesive layer 5, an acrylic foam layer 6, a second adhesive layer 7, and a release layer 8, which are sequentially disposed along a longitudinal direction.

Wherein, mute black printing layer 1 includes 1.6 μm's black printing ink layer and 2 μm's gloss oil layer, and the black printing ink layer is located thin layer 2 one side, and the gloss oil layer is located the black printing ink layer one side that faces away from thin layer 2, and the gloss oil layer selects silicon series gloss oil.

The film layer 2 is polyethylene terephthalate with the thickness of 2 mu m, the surface wetting tension of 46dynes/m, the water drop angle of less than 90 degrees, the printing thickness of the black ink layer of 1.6 mu m, the color L32 +/-3/a 0 +/-2/2 +/-2, the gloss of 2.0 +/-1.5 and smooth visual observation.

The composite adhesive layer 3 is made of a combination of an acrylic adhesive and rosin resin, the addition amount of the rosin resin accounts for 1.7% of the mass of the acrylic adhesive, and the thickness of the composite adhesive layer 3 is 5 microns;

the stainless steel layer 4 was made of SUS430, and had a thickness of 10. + -.2 μm, a tensile strength of 500MPa, a shear force of 320MPa, a Hardness of (HB) 160, satisfactory die-cutting properties, and no edge deformation when viewed.

The thickness of the first adhesive layer 5 is 25 micrometers, the first adhesive layer is made of a combination of an acrylic adhesive and rosin resin, and the addition amount of the rosin resin accounts for 1.7% of the mass of the acrylic adhesive;

the acrylic foam layer 6 is an acrylic foam adhesive tape, the thickness is 0.15mm, the initial adhesion is 25#, the adhesion force is 2500-3000 gf/in, the high-temperature retention force is 80 ℃ for 0mm of gliding after x72hrs, the dynamic shear force is 750, the rebound resistance of 2mm is qualified, and the compression ratio @50% compression force is less than 2.3kg;

the thickness of the second adhesive layer 7 is 25 micrometers, the second adhesive layer is made of a combination of an acrylic adhesive and rosin resin, and the addition amount of the rosin resin accounts for 1.7% of the mass of the acrylic adhesive;

the thickness of the release film adopted by the release layer 8 is 75 μm, the residual rate is more than or equal to 80 percent, and the release force is 5-15 g/in;

the total thickness of the high strength adhesive tape provided in this example was 170 μm.

The preparation method of the high-strength label tape of embodiment 1 is performed according to a single-layer multiple-compounding process by using a short-version multilayer laminating machine, and specifically includes:

(1) Adopting the coating of little gravure printing, setting for quick-witted speed 30m/min, printing the dull black printing layer on PET film layer surface and obtaining dull black printing film, specifically do:

printing black ink on the surface of the film layer, wherein the printing thickness is 0.8 mu m, placing the film layer in an oven for curing after printing, setting the temperature of the oven to be 70 ℃ in a first area, 80 ℃ in a second area, 90 ℃ in a third area, 95 ℃ in a fourth area, 85 ℃ in a fifth area and 75 ℃ in a sixth area, then maintaining the temperature of 45 ℃ for curing for 24 hours, and then placing the film layer at 23-25 ℃ for cooling for 24 hours, namely forming a first printing ink layer on the surface of the film layer;

and repeating the working procedures, printing black ink again on the surface of the first printing ink layer, wherein the printing thickness is 0.8 mu m, and forming a second printing ink layer. Wherein, the curing and cooling process of the second printing ink layer is the same as that of the first printing ink layer;

the first printing ink layer and the second printing ink layer form a black ink layer.

Printing gloss oil on the second printing ink layer, wherein the printing thickness is 2 microns, placing the second printing ink layer in an oven for curing after printing, setting the temperature of the oven to be 70 ℃ in a first area, 80 ℃ in a second area, 105 ℃ in a third area, 100 ℃ in a fourth area, 85 ℃ in a fifth area and 70 ℃ in a sixth area, and then curing for 48 hours at 45 ℃.

(2) Transfer coating is adopted, the machine speed is set to be 20m/min, the coating thickness is set to be 5 microns, a first release film with the thickness of 75 microns is placed on a coating head, a composite glue layer is coated on the first release film, then the first release film is placed in an oven for curing, the temperature of the oven is set to be 70 ℃ in a first area, 75 ℃ in a second area, 90 ℃ in a third area, 95 ℃ in a fourth area, 90 ℃ in a fifth area and 70 ℃ in a sixth area, the curing is kept at 45 ℃ for 48 hours, then the matte black printing film prepared in the step (1) is compounded with the composite glue layer to obtain the matte black printing film adhesive tape, and the composite glue layer is arranged on one side, back to the black ink layer, of the film layer.

(3) Transfer coating is adopted, the machine speed is set to be 25m/min, the coating thickness is set to be 25 μm, a release film with the thickness of 75 μm is arranged on a coating head, a second adhesive layer is coated on the release film, the release film is cured by a drying oven, the temperature of the drying oven is set to be 70 ℃ in a first region, 80 ℃ in a second region, 95 ℃ in a third region, 100 ℃ in a fourth region, 105 ℃ in a fifth region and 70 ℃ in a sixth region, the release film and the acrylic foam placed on the coating tail are attached and wound, and the acrylic foam single-sided adhesive tape is obtained; repeating the steps, placing the second release film on a coating head, coating the first adhesive layer on the second release film, laminating and rolling the second release film and the non-adhesive surface of the single-sided adhesive of the foam after passing through a drying oven to obtain a finished product, and curing for 48 hours at the temperature of 45 ℃;

obtaining the acrylic foam double-sided tape.

(4) Adopting a multilayer laminating machine, setting the effective width of the composite material to be 200-420 mm +/-3 mm:

the first way is that: printing a matte black film adhesive tape composite stainless steel sheet 430: and a discharging frame at the head end, a printing matte black film adhesive tape which is produced in advance is placed on a first discharging shaft at the upper part, a stainless steel sheet 430 is placed on a second discharging shaft at the lower part, and a release film stripped from the printing matte black film adhesive tape is rolled up by a third discharging shaft at the front part. The discharging tension of the first discharging shaft is 0.5-1N, the discharging tension of the second discharging shaft is 5-8N, and the machine speed is controlled to be 7-10 m/min. And winding the film to a tail end winding shaft through a middle section laminating wheel, wherein the winding tension is 5-8N.

And a second step: the printing matte black film stainless steel material that first process is compound accomplishes is compound does not have substrate acryl sticky tape: in the head end discharging frame, a first discharging shaft on the upper part places a substrate-free acrylic adhesive tape which is produced in advance, a second discharging shaft on the lower part places a first composite printed matte black thin film stainless steel material, and a third discharging shaft on the front part winds a release film stripped from the substrate-free acrylic adhesive tape. The discharging tension of the first discharging shaft is 2-4N, the discharging tension of the second discharging shaft is 5-8N, and the machine speed is controlled to be 7-10 m/min. And winding the adhesive tape to a tail end winding shaft through a middle section laminating wheel, and obtaining the high-strength label adhesive tape with the winding tension of 6-9N.

According to the laminating demand when using, die cut the high strength label sticky tape of embodiment respectively and take shape, make its size be: length 22mm x width 14mm. And bending the high-strength label adhesive tape subjected to die cutting twice, wherein the bending angle is 90 degrees at each time, so that the high-strength label adhesive tape forms a first binding face, a second binding face and a third binding face which are sequentially connected. The first attaching surface and the third attaching surface are arranged oppositely and are arranged in parallel. The second binding face is arranged between the first binding face and the third binding face and is perpendicular to the first binding face and the third binding face. The size of the first binding surface is as follows: 9.65mm in length by 14mm in width. The size of the second binding face is as follows: 3.95mm long by 14mm wide. The size of the third attaching face is as follows: 9.65mm in length by 14mm in width.

The first iron block and the second iron block were fixed with the high strength label tape die-cut and formed and bent in example 1, respectively, to obtain five test samples. And tearing off the release layer of each test sample to ensure that the second adhesive layer is attached to the first iron block and the second iron block. The first iron block is arranged at the upper end of the second iron block. The first binding face of the high-strength label adhesive tape is bound with the upper end face of the first iron block, the second binding face of the high-strength label adhesive tape is bound with the side faces of the first iron block and the second iron block, and the third binding face of the high-strength label adhesive tape is bound with the lower end face of the second iron block.

In other words, the upper end of second iron plate is located to first iron plate, and whole after vertical stack is followed to first iron plate and second iron plate is equivalent to a cuboid iron plate, and the cuboid iron plate has adjacent three faces, and the second glue film needs to wrap up three faces of cuboid iron plate. For example, the second glue layer needs to wrap the upper end surface and the lower end surface of the cuboid iron block and a side surface between the upper end surface and the lower end surface. The second glue film needs 90 to bend (corresponds the transition of 90 bending between first binding face and the second binding face) when passing through to the side of cuboid iron plate from the up end of cuboid iron plate, also needs 90 to bend (corresponds the transition of 90 bending between second binding face and the third binding face) when the second glue film passes through to the lower terminal surface of cuboid iron plate from the side of cuboid iron plate.

The test sample bonded by the high-strength label tape of embodiment 1 is subjected to performance test, wherein the drop height of the wrapped falling-resistant test is 2m, and the test result shows that: the test sample of example 1 passed the 2M height drop test x100 times without cocking and delamination.

The high-strength label tape prepared in embodiment 1 of the invention can meet the following hardness indexes: (1) The space is limited, and the design of the thickness of the high-strength label adhesive tape is controlled within 0.04 mm. (2) The surface of the high-strength label adhesive tape presents uniform matte black and has the printing performance. (3) The high-strength label tape wrapped iron block has two 90-degree angle bending, so that good adhesive force can be ensured, and the sticking is not tilted. (4) The high-strength label tape can be smoothly coated on the surface of an iron block, perfectly covers the gap part, and is free from collapse visually. (5) The strength of the label can meet the drop test, and the high-strength label adhesive tape can be prevented from being broken or falling off when the product is impacted. The high-strength label tape can meet the requirement of bonding and fixing a pair of iron blocks in the touch motor module.

In summary, for the preparation of the high strength marking tape of the present invention, the material type and thickness of each layer are set, starting from the requirement of satisfying the thickness limit. To meet the requirement of the matte black color of the appearance, a printing and coating process is selected to realize the matte black color. In order to meet the requirements of the printing and coating process, the flatness and the wettability are taken as priority, the material strength is integrated, and finally the polyethylene terephthalate is selected as the base material for printing and coating.

Next, it is important to consider that the application of the high strength label tape is to replace the conventional welding process, the strength of the high strength label tape is very important, and it is also required to satisfy the requirements of covering the gap perfectly in appearance and having no recess phenomenon in visual or hand feeling. Meanwhile, the hardness of the high-strength label adhesive tape needs to be considered, and the flexibility and the ductility of the high-strength label adhesive tape need to be considered due to the fact that the attachment design involves two 90-degree bending. After a heavy weight evaluation test, a metal material is selected as a reinforcing material of the high-strength label tape, the properties of the tensile rate, the tensile strength, the material hardness and the like of the high-strength label tape are comprehensively evaluated in various types of metal materials, and finally the SUS430 has the best effect.

And finally, a first adhesive layer and a second adhesive layer of the high-strength label adhesive tape are provided, wherein the high-strength label adhesive tape needs to wrap three surfaces of an iron block, two 90-degree bends are formed in the three surfaces, and the high-strength label adhesive tape needs to be subjected to a drop-resistant test and cannot be subjected to tilting or layering abnormity, so that the initial adhesion, the adhesive force and the adhesion degree performance are emphasized in the design of the adhesive, an acrylic adhesive is finally selected as a main agent, a tackifying resin additive is matched to improve the initial adhesion and the adhesive force, and an isocyanate bridging agent is used to increase the adhesive force between the adhesive and a base material.

The high-strength label tape comprises multiple layers of materials and is complex in structure, and a single-layer multiple-compounding process is adopted for production when the high-strength label tape is produced. Namely, the matte black printed film tape and the acryl foam double-sided tape are respectively produced, and then the matte black printed film tape, the SUS430 and the acryl foam double-sided tape are sequentially and respectively compounded. In the composite process, the matte black printing film adhesive tape and the SUS430 are firstly attached to obtain the matte black printing film metal material, and then the matte black printing film metal material and the acrylic foam double-sided adhesive tape are compounded, so that the phenomena of folding, deformation, curling and tilting can be avoided.

The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A high-strength label tape is characterized by comprising a matte black printing layer, a film layer, a composite adhesive layer, a stainless steel layer, a first adhesive layer, an acrylic foam layer, a second adhesive layer and a release layer which are sequentially arranged; the sum of the thicknesses of the acrylic foam layer, the first adhesive layer and the second adhesive layer is 100-250 mu m; the first adhesive layer and the second adhesive layer are respectively made of a combination of acrylic adhesive and rosin resin, the thickness of the first adhesive layer is 22-28 micrometers, and the thickness of the second adhesive layer is 22-28 micrometers;

wherein, the first and the second end of the pipe are connected with each other,

the film layer is made of polyethylene terephthalate;

the composite adhesive layer is made of a combination of an acrylic adhesive and rosin resin; in the combination of the acrylic adhesive and the rosin resin, the addition amount of the rosin resin accounts for 0.5-1.7% of the mass of the acrylic adhesive;

the stainless steel layer is made of 430 stainless steel.

2. The high strength label tape according to claim 1, wherein the matte black printing layer comprises a black ink layer and a gloss oil layer, the black ink layer being provided on the film layer side;

the thickness of the black ink layer is 1.6 to 2 mu m, and the thickness of the light oil layer is 2 to 3 mu m.

3. A high strength label tape according to claim 1, wherein the thickness of the film layer is 1.5 to 2.5 μm.

4. A high strength label tape according to claim 1, wherein the sum of the thicknesses of the acryl foam layer, the first adhesive layer and the second adhesive layer is 150 μm.

5. The high strength adhesive tape according to claim 1, wherein in the combination of the acrylic adhesive and the rosin resin, the amount of rosin resin added is 1.7% by mass of the acrylic adhesive.

6. A high strength label tape according to claim 1, wherein the thickness of the stainless steel layer is 8 to 12 μm;

the thickness of the release layer is 70 to 80 mu m, the residual rate of a release film adopted by the release layer is more than or equal to 80 percent, and the release force is 5 to 15g/in.

7. A high strength label tape according to claim 1 wherein the thickness of the high strength label tape is 150-320 μm.

8. A method for preparing a high-strength label tape according to claim 1, wherein the method for preparing the same uses a short type multi-layer laminating machine having a length of 2m;

the feeding shaft is provided with a motor type edge aligning machine, and the distance between the head end feeding frame and the attaching wheel is 1.4m;

the laminating wheel comprises an upper shaft and a lower shaft, and the lower shaft is a stainless steel mirror wheel; the upper shaft is a silica gel wheel with the diameter of 80mm, the thickness of the silica gel layer is 20mm, and the Shore A hardness is 70;

the distance between the winding shaft and the bonding wheel is 45cm;

the preparation method comprises the following steps:

placing a printed matte black film adhesive tape on a first discharging shaft above, wherein the printed matte black film adhesive tape is a matte black printing layer, a thin film layer and a composite adhesive layer, a release film is arranged on the printed matte black film adhesive tape, a stainless steel layer is placed on a second discharging shaft below, and a third discharging shaft in front is used for stripping the release film on the thin film layer printed with the matte black printing layer; wherein the feeding tension of the upper first feeding shaft is 0.5 to 1N, the feeding tension of the lower second feeding shaft is 5 to 8N, and the machine speed is 7 to 10m/min;

compounding the printed matte black film adhesive tape and the stainless steel layer through an intermediate laminating wheel, and then rolling by a rolling shaft to obtain a matte black metal composite film;

pre-compounding the first adhesive layer, the acrylic foam layer, the second adhesive layer and the two release layers to obtain the acrylic foam double-sided adhesive

The double-sided acrylic foam adhesive tape comprises a double-sided acrylic foam adhesive tape and two release layers, wherein the two release layers are respectively arranged on two sides of the double-sided acrylic foam adhesive tape;

placing the acrylic foam double-sided tape on a first discharging shaft above, placing the matte black metal composite film on a second discharging shaft below, and using a third discharging shaft in front for stripping a release film on one side of the acrylic foam double-sided tape; wherein the feeding tension of the upper first feeding shaft is 2 to 4N, the feeding tension of the lower second feeding shaft is 5 to 8N, and the machine speed is 7 to 10m/min;

9. Use of the high strength label tape according to any of claims 1-7 in the adhesive fixation of touch motor modules,

the high-strength label tape covers two metal surfaces of the touch motor module and adheres three surfaces to form at least two 90-degree folding angles.