CN109825213B - Foam adhesive tape and preparation method thereof - Google Patents
Foam adhesive tape and preparation method thereof Download PDFInfo
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- CN109825213B CN109825213B CN201811598881.6A CN201811598881A CN109825213B CN 109825213 B CN109825213 B CN 109825213B CN 201811598881 A CN201811598881 A CN 201811598881A CN 109825213 B CN109825213 B CN 109825213B
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- foam adhesive
- oligomer
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- ZDQNWDNMNKSMHI-UHFFFAOYSA-N 1-[2-(2-prop-2-enoyloxypropoxy)propoxy]propan-2-yl prop-2-enoate Chemical compound C=CC(=O)OC(C)COC(C)COCC(C)OC(=O)C=C ZDQNWDNMNKSMHI-UHFFFAOYSA-N 0.000 description 2
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- RZVINYQDSSQUKO-UHFFFAOYSA-N 2-phenoxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC1=CC=CC=C1 RZVINYQDSSQUKO-UHFFFAOYSA-N 0.000 description 2
- KTALPKYXQZGAEG-UHFFFAOYSA-N 2-propan-2-ylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(C(C)C)=CC=C3SC2=C1 KTALPKYXQZGAEG-UHFFFAOYSA-N 0.000 description 2
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- FHLPGTXWCFQMIU-UHFFFAOYSA-N [4-[2-(4-prop-2-enoyloxyphenyl)propan-2-yl]phenyl] prop-2-enoate Chemical class C=1C=C(OC(=O)C=C)C=CC=1C(C)(C)C1=CC=C(OC(=O)C=C)C=C1 FHLPGTXWCFQMIU-UHFFFAOYSA-N 0.000 description 2
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- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Abstract
The invention discloses a foam adhesive tape and a preparation method thereof. The foam adhesive tape comprises a foam adhesive layer, an adhesive layer and at least one release film, wherein the adhesive layer and the at least one release film are arranged on the upper side and the lower side of the foam adhesive layer, the release film is arranged on the adhesive layer and is far away from one side of the foam adhesive layer, and the interface of the foam adhesive layer is combined with the interface of the adhesive layer through a chemical bond. The foam adhesive tape has high bonding strength between the foam adhesive layer and the adhesive layer, can firmly adhere an object to be adhered, and avoids the problem of bonding failure caused by the separation of the interface between the adhesive layer and the foam adhesive layer.
Description
Technical Field
The invention belongs to the technical field of adhesive tapes, and particularly relates to a foam adhesive tape and a preparation method thereof.
Background
The foam adhesive tape is made by using EVA (ethylene-vinyl acetate copolymer) or PE (polyethylene) foam as a base material, coating solvent type (or hot melt type) pressure-sensitive adhesive on one surface or two surfaces of the base material and then compounding release paper, and has the effects of sealing, shock absorption, compression deformation resistance, flame retardance, wettability and the like. The foam adhesive tape is widely applied to insulation, sticking, sealing, antiskid and buffering shockproof packaging of electronic and electric products, mechanical parts, various small household appliances, mobile phone accessories, industrial instruments, computers and peripheral equipment, automobile accessories, audio and video equipment, toys, cosmetics, art gifts, medical instruments, electric tools, office stationery, shelf exhibition, home decoration, acrylic glass, ceramic products and transportation industry.
The traditional foam adhesive tape adopts a foam adhesive layer, so that the cohesiveness of the foam adhesive tape is very high, and particularly, special surface treatment is not carried out between the foam and the adhesive layer, so that the adhesive part has low cohesiveness, is very easy to peel and has poor sealing effect; meanwhile, various solvents are added in the production process of the traditional foam adhesive tape, so that environmental pollution and energy waste are caused, especially, a solvent recovery or combustion device is required for coating equipment, and serious environmental pollution is caused if the solvent is directly discharged; in addition, during the drying process, the safety risk factor increases due to the presence of solvents and high temperatures.
Disclosure of Invention
The invention aims to provide a foam adhesive tape with high strength and a preparation method thereof.
In order to achieve the purpose, the invention provides a foam adhesive tape which is characterized by comprising a foam adhesive layer, adhesive layers arranged on the upper side and the lower side of the foam adhesive layer and at least one layer of release film, wherein the release film is arranged on one side of the adhesive layer far away from the foam adhesive layer, and the interface of the foam adhesive layer and the adhesive layer is combined through a chemical bond.
Further, the material of the foam adhesive layer comprises: oligomers, monomers, photoinitiators, hollow particles, the functionality of the oligomers and the monomers being less than or equal to 3.
Further, the weight percentage of the oligomer in the foam adhesive layer is not less than 20%, and preferably, the weight percentage of the oligomer in the foam adhesive layer is 30-50%.
Further, the total conversion rate of double bonds of the oligomer and the monomer is 40-90%.
Further, the material of the adhesive layer includes: oligomers, monomers, photoinitiators, said oligomers and said monomers having a functionality of less than or equal to 3.
Further, the oligomer accounts for not less than 20% of the weight of the adhesive layer, and preferably, the oligomer accounts for 30-50% of the weight of the adhesive layer.
Furthermore, the thickness of the foam adhesive layer is 0.1mm-2mm, and the thickness of the adhesive layer is 50-200 μm.
In another aspect of the present invention, a method for preparing a foam tape is provided, which comprises the following steps:
s1) mixing oligomer with functionality less than or equal to 3, monomer with functionality less than or equal to 3, photoinitiator and hollow particles uniformly to obtain the productThe foam adhesive layer composition is coated on a release film, and is cured by double-sided irradiation UV (ultraviolet) to form a semi-cured foam adhesive layer, wherein the UV energy is 2 x (200-400) mj/cm2；
S2) uniformly mixing the oligomer with the functionality of less than or equal to 3, the monomer with the functionality of less than or equal to 3 and the photoinitiator to obtain an adhesive layer composition, coating the adhesive layer composition on one side of the foam adhesive layer far away from the release film at the ratio of 200-400 mj/cm2The energy ultraviolet light is solidified to form an adhesive layer, and the interface of the adhesive layer and the foam adhesive layer is combined through chemical bonds;
s3) tearing off the release film, coating the adhesive layer composition on the other side of the foam adhesive layer, and coating the adhesive layer composition at a ratio of 200-400 mj/cm2The energy ultraviolet light is solidified to form an adhesive layer, and the interface of the adhesive layer and the foam adhesive layer is combined through chemical bonds;
s4) attaching a release film to one side of the at least one adhesive layer to form the foam adhesive tape.
Further, in the step S1), the thickness of the foam adhesive layer is 0.1mm-2mm, and the double bond conversion rate of the foam adhesive layer composition is 40-90%.
Further, in the step S1), a release film is coated on the foam rubber layer composition before or after the double-sided irradiation UV curing step.
In another aspect of the present invention, a method for preparing a foam tape is provided, which comprises the following steps:
s1') uniformly mixing an oligomer with the functionality of less than or equal to 3, a monomer with the functionality of less than or equal to 3, a photoinitiator and hollow particles to obtain a foam rubber layer composition, and uniformly mixing the oligomer with the functionality of less than or equal to 3, the monomer with the functionality of less than or equal to 3 and the photoinitiator to obtain an adhesive layer composition;
s2') respectively feeding the adhesive layer composition, the foam adhesive layer composition and the adhesive layer composition into corresponding extrusion systems for fusion and coextrusion to form a three-layer coextrusion film with the adhesive layer, the foam adhesive layer and the adhesive layer, wherein the interface of the adhesive layer and the foam adhesive layer is combined through chemical bonds;
s3') attaching a release film to one side of the at least one adhesive layer to form a foam tape.
Compared with the prior art, the invention has the following beneficial effects:
according to the foam adhesive tape, the interface of the adhesive layer and the interface of the foam adhesive layer are combined through chemical bonds, so that the acting force of the adhesive layer and the foam adhesive layer is improved, the strength of the foam adhesive tape is enhanced, and the problem of bonding failure caused by the separation of the interface of the adhesive layer and the interface of the foam adhesive layer is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a view showing the construction of the foam tape of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms first, second, upper, lower and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As introduced in the background art, the foam adhesive tape in the prior art uses EVA or PE foam as a substrate and a foam structure layer, which has a great problem in its adhesion, and some foam adhesive tapes are made by coating a solvent-based (or hot-melt type) pressure sensitive adhesive on one or both sides of the foam structure, but no special surface treatment is performed between the foam and the adhesive layer, so that the adhesive part has a low adhesion, is very easy to peel off, and has poor sealing effect. In order to solve the above problems, the present invention provides a foam adhesive tape, as shown in fig. 1, including a foam adhesive layer 1, adhesive layers 2 disposed on the upper and lower sides of the foam adhesive layer, and at least one release film 3 disposed on the side of the adhesive layer away from the foam adhesive layer, wherein the interface between the foam adhesive layer and the adhesive layer is bonded by chemical bonds.
The foam adhesive layer of the foam adhesive tape is combined with the adhesive layers arranged on the upper side and the lower side of the foam adhesive tape through chemical bonds, so that the acting force of the foam adhesive layer and the adhesive layers is improved, the binding force is stronger compared with the intermolecular acting force of the traditional foam adhesive tape, the problem of bonding failure caused by the separation of the interface of the adhesive layer and the foam adhesive layer can be avoided, and the strength of the foam adhesive tape is improved.
In the foam adhesive tape, the material of the foam adhesive layer comprises oligomer, monomer, photoinitiator and hollow particles, wherein the functionality of the oligomer and the monomer is less than or equal to 3. The low polymer and the monomer with the functionality degree of less than or equal to 3 are adopted, and the low polymer and the monomer with the functionality degree of less than or equal to 3 are low in curing speed, so that a semi-cured state can be formed under the low-energy ultraviolet curing, part of unreacted low polymer and monomer still exist, part of double bonds remain, and the double bonds in the low polymer and the monomer of the adhesive layer can react to form chemical bonds, so that the binding force between the foam adhesive layer and the adhesive layer is improved, and the overall strength of the foam adhesive tape is improved.
In the foam adhesive layer, the weight percentage of the oligomer in the foam adhesive layer is not less than 20%, and if the weight percentage of the oligomer in the foam adhesive layer is less than 20%, on one hand, the oligomer content is too low, the monomer content is relatively high, the reaction rate is too slow, the viscosity of the foam adhesive layer is low, the cured foam adhesive layer is still fluid, a semi-cured foam adhesive layer cannot be formed, and on the other hand, the low viscosity of the foam adhesive layer is not suitable for roll-to-roll production. In order to better improve the reaction rate and ensure a certain amount of double bond residues, the weight percentage of the oligomer in the foam adhesive layer is preferably 30-50%.
In the foam adhesive layer, the double bonds of the acrylate in the oligomer and the acrylate in the monomer are opened for polymerization reaction, the conversion rate of the double bonds is 40-90%, and the foam adhesive layer and the adhesive layer have good binding force. If the conversion rate of the double bonds is lower than 40%, the reaction of the foam adhesive layer is incomplete, and a semi-cured state cannot be formed, and if the conversion rate of the double bonds is higher than 90%, the unreacted double bonds are reduced, the chemical bond bonding between the foam layer and the adhesive layer is relatively less, and the bonding force of the foam adhesive tape is reduced. The above-mentioned double bond conversion rate is a ratio of the amount of the reacted double bonds to the total amount of the double bonds, and can be measured by infrared spectroscopy IR, nuclear magnetic NMR, or the like.
The above-mentioned oligomer can be selected from acrylate oligomers with functionality less than or equal to 3, which are conventional in the art, and can be one or more of urethane acrylate, polyester acrylate, pure acrylate and epoxy acrylate; the monomer may be selected from monofunctional, difunctional or trifunctional reactive diluent monomers commonly used in the art, and may be, for example, one or more of (meth) acrylate, isobornyl (meth) acrylate (IBOA), ethoxylated bisphenol a diacrylate (ODA), 1, 6-hexanediol diacrylate (HDDA), tetrahydrofurfuryl acrylate (THFA), phenoxyethyl acrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, isodecyl acrylate, ethoxyethoxyethyl acrylate, lauric acrylate, trimethylolpropane triacrylate.
The above-mentioned photoinitiators may be those commonly used in the art, for example: 1-hydroxycyclohexyl phenyl ketone (184), 2-hydroxy-methyl phenyl propane-1-ketone (1173), 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-acetone (907), benzoin dimethyl ether (651), xylene ketone (BP), 2-Isopropyl Thioxanthone (ITX) and 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide (TPO).
The hollow particles may be inorganic hollow particles or organic hollow particles, and the inorganic hollow particles may be, for example, hollow SiO2. In order to enable the foam adhesive tape to have good buffering and sound insulation effects, the hollow particles account for 0.1-30% by weight of the foam adhesive layer, and if the hollow particles account for less than 0.1% by weight of the foam layer, the foam adhesive tape has poor buffering performance and noise insulation effect, and if the hollow particles account for more than 30%, the adhesive force of the foam layer is reduced due to excessive use of the hollow particles, preferably, the hollow particles account for 5-20% by weight of the foam layer.
The hollow particles have a particle size of 1 to 1000 μm, and if the particle size is less than 1 μm, the foam tape has a poor sound insulation and vibration damping effect, and if the particle size is greater than 1000 μm, the adhesive force between the foam layer and the adhesive layer is remarkably reduced, and more preferably, the hollow particles have a particle size of 10 to 150 μm.
In addition, the foam layer may further contain auxiliary agents, such as a dispersing agent, a coupling agent, etc., to uniformly disperse the hollow particles to prevent aggregation.
In the foam adhesive tape, the material of the adhesive layer comprises oligomer, monomer and photoinitiator, wherein the functionality of the oligomer and the monomer is less than or equal to 3, and the oligomer accounts for not less than 20% of the weight of the adhesive layer. The oligomer and the monomer with the functionality of less than or equal to 3 are adopted, and the low functionality has high viscosity after curing, so that the adhesive force between the adhesive layer and the stuck object can be improved. The oligomer accounts for not less than 20% of the weight of the adhesive layer, and if the oligomer accounts for less than 20%, on one hand, the oligomer content is too low, the monomer content is relatively high, the reaction rate is too slow, a solid or semisolid adhesive layer cannot be formed, and on the other hand, the oligomer is not suitable for roll-to-roll production. Preferably, the oligomer accounts for 30-50% of the weight of the adhesive layer, and can improve the reaction rate of the adhesive layer and the adhesive force with an attached object.
The oligomer and the monomer in the adhesive layer can be the same as or different from those in the foam layer, and the oligomer can be selected from acrylate oligomers with the functionality less than or equal to 3, which are conventional in the field, such as one or more of urethane acrylate, polyester acrylate, pure acrylate and epoxy acrylate; the monomer having a functionality of 3 or less may be selected from mono-, di-or tri-functional monomers commonly used in the art, and may be, for example, one or more of (meth) acrylate, isobornyl (meth) acrylate (IBOA), ethoxylated bisphenol A diacrylate (ODA), 1, 6-hexanediol diacrylate (HDDA), tetrahydrofurfuryl acrylate (THFA), phenoxyethyl acrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, isodecyl acrylate, ethoxyethoxyethyl acrylate, lauric acrylate, trimethylolpropane triacrylate.
The photoinitiator in the adhesive layer described above may be an initiator commonly used in the art, for example: 1-hydroxycyclohexyl phenyl ketone (184), 2-hydroxy-methyl phenyl propane-1-ketone (1173), 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-acetone (907), benzoin dimethyl ether (651), xylene ketone (BP), 2-Isopropyl Thioxanthone (ITX) and 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide (TPO).
In a preferred embodiment, the adhesive layer further comprises 1 to 5% by weight of a tackifier, and the tackifier is selected from, for example, phosphate esters, which can improve the adhesion between the adhesive layer and the adherend.
The adhesive layers arranged on the upper side and the lower side of the foam adhesive layer of the foam adhesive tape can have the same or different adhesive force, and are selected according to actual needs. Different binding power can be realized by regulating the addition amount of the tackifying assistant in the adhesive layer.
In the foam adhesive tape, the thickness of the foam layer is 0.1mm-2 mm; the thickness of the adhesive layer is 50 to 200 μm.
The invention also provides a preparation method of the foam adhesive tape, which can be prepared by adopting the processes of one-time coating, multiple coating or extrusion and the like.
In a preferred embodiment of the present invention, the preparation of the foam tape comprises the steps of:
s1) uniformly mixing the oligomer with the functionality of less than or equal to 3, the monomer with the functionality of less than or equal to 3, the photoinitiator and the hollow particles to obtain a foam adhesive layer composition, coating the foam adhesive layer composition on a release film, and carrying out double-sided UV (ultraviolet) curing to form a semi-cured foam adhesive layer, wherein the UV energy is 2 x (200-400) mj/cm2；
S2) uniformly mixing the oligomer with the functionality of less than or equal to 3, the monomer with the functionality of less than or equal to 3 and the photoinitiator to obtain an adhesive layer composition, coating the adhesive layer composition on one side of the foam adhesive layer far away from the release film at the ratio of 200-400 mj/cm2The UV energy and the ultraviolet light are solidified to form an adhesive layer, and the interface of the adhesive layer and the foam layer is combined through chemical bonds;
s3) tearing off the release film, coating the adhesive layer composition on the other side of the foam adhesive layer, and coating the adhesive layer composition at a ratio of 200-400 mj/cm2The energy ultraviolet light is solidified to form an adhesive layer, and the interface of the adhesive layer and the foam adhesive layer is combined through chemical bonds;
s4) attaching a release film to one side of the at least one adhesive layer to form the foam adhesive tape.
In the step S1), on one hand, the foam adhesive layer is 2 × 2 (200-400 mj/cm)2) The low-energy double-sided irradiation ultraviolet light is used for curing, the curing speed is slow, and a semi-curing state is easy to form; on the other hand, only one side of the foam adhesive layer is covered with the release film, and the side which is not provided with the release film has the phenomenon of oxygen inhibition in the photocuring process, so that the residual amount of the unreacted double bonds is more. The upper side and the lower side of the foam adhesive layer are respectively coated with the adhesive layer, and the unreacted double bonds in the foam adhesive layer react with the double bonds in the adhesive layer to form chemical bonds, so that the interface of the adhesive layer and the foam adhesive layer is combined through the chemical bonds, the overall strength of the foam adhesive tape is improved, and the problem of bonding failure caused by the separation of the interface of the adhesive layer and the foam adhesive layer is solved.
The thickness of the foam rubber layer is 0.1mm-2mm, and the thickness is relatively thick, so that the reaction rate is relatively slower under the low-energy ultraviolet light curing, the foam rubber layer is in a semi-cured state, and the surface of the foam rubber layer has viscosity. The double bond conversion rate of the foam adhesive layer composition is 40-90%, unreacted double bonds react with double bonds of the adhesive layer to form chemical bonds, and the binding force of the adhesive layer and the foam adhesive layer is improved.
Further, the step S1) includes a step of coating a release film on the foam rubber layer composition before or after the double-sided UV curing step. The release film covers the two sides of the foam adhesive layer composition, so that the foam adhesive layer can be better protected, and the phenomenon of mutual adhesion caused by the viscosity of the surface of the foam adhesive layer during rolling can be prevented.
In another preferred embodiment of the present invention, the foam tape is prepared by the steps of:
s1') uniformly mixing the oligomer with the functionality of less than or equal to 3, the monomer with the functionality of less than or equal to 3, the photoinitiator and the hollow particles to obtain a foam adhesive layer composition, and uniformly mixing the oligomer with the functionality of less than or equal to 3, the monomer with the functionality of less than or equal to 3 and the photoinitiator to obtain an adhesive layer composition;
s2') respectively feeding the adhesive layer composition, the foam adhesive layer composition and the adhesive layer composition into corresponding extrusion systems for fusion and coextrusion to form a three-layer coextrusion film with the adhesive layer, the foam adhesive layer and the adhesive layer, wherein the interface of the adhesive layer and the foam adhesive layer is combined through chemical bonds;
s3') attaching a release film to one side of the at least one adhesive layer to form a foam tape.
In the step S2'), the three layers of the adhesive layer, the foam adhesive layer and the adhesive layer are independent, the middle foam adhesive layer cannot be mixed with the adhesive layer, and double bonds between the three layers react with each other, so that the interface of the adhesive layer and the foam adhesive layer is combined through chemical bonds, the overall strength of the foam adhesive tape is improved, and the problem of bonding failure caused by the separation of the interface of the adhesive layer and the foam adhesive layer is solved.
The advantageous effects of the present invention will be further described below with reference to examples and comparative examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Adhesive layer composition:
foam rubber layer composition
Coating the foam adhesive layer composition on a release film with the thickness of 1mm, coating the release film on the surface, curing, and performing double-sided UV irradiation with the energy of 2 x 400mj/cm2Coating adhesive layer composition on both sides of the foam layer with thickness of 100um, curing the coating film with energy of 400mj/cm2And obtaining the foam adhesive tape.
Example 2
Adhesive layer composition:
foam rubber layer composition
Coating the foam adhesive layer composition on a release film with the thickness of 1mm, coating the release film on the surface, curing, and performing double-sided UV irradiation with the energy of 2 x 400mj/cm2Coating adhesive layer composition on both sides of the foam layer with thickness of 100um, curing the coating film with energy of 400mj/cm2To obtainFoam tape.
Example 3
Adhesive layer composition:
foam rubber layer composition
Coating a foam adhesive layer composition on a release film, wherein the thickness of the foam adhesive layer composition is 1mm, and the foam adhesive layer composition is subjected to double-sided UV irradiation and energy of 2 x 400mj/cm2Coating adhesive layer composition on both sides of the foam layer with thickness of 100um, curing the coating film with energy of 400mj/cm2And obtaining the foam adhesive tape.
Example 4
Adhesive layer composition:
foam layer composition
Respectively feeding the adhesive layer composition, the foam rubber layer composition and the adhesive layer composition into corresponding extrusion systems for melt co-extrusion, and performing double-side illumination UV and energy of 2 x 400mj/cm2And forming a three-layer co-extrusion film with an adhesive layer, a foam adhesive layer and an adhesive layer to obtain the foam adhesive tape.
Example 5
Adhesive layer composition:
foam rubber layer composition
Coating the foam adhesive layer composition on a release film with the thickness of 1mm, coating the release film on the surface, curing, and performing double-sided UV irradiation with the energy of 2 x 400mj/cm2Coating adhesive layer composition on both sides of the foam layer with thickness of 100um, curing the coating film with energy of 400mj/cm2And obtaining the foam adhesive tape.
Comparative example 1
Foam rubber layer composition
Coating a foam layer on a release film with the thickness of 1mm, coating the release film on the surface, curing, and irradiating UV on both sides with energy of 2 x 400mj/cm2The finished product is of a single-layer structure.
Comparative example 2
Adhesive layer composition:
coating adhesive on both sides of the PE foam with a thickness of 100um, curing the coating film with energy of 400mj/cm2。
Comparative example 3
Adhesive layer composition:
foam rubber layer composition
Coating the foam adhesive layer composition on a release film with the thickness of 1mm, coating the release film on the surface, curing, and performing double-sided UV irradiation with the energy of 2 x 400mj/cm2Coating adhesive layer composition on both sides of the foam layer with thickness of 100um, curing the coating film with energy of 400mj/cm2And obtaining the foam adhesive tape.
Comparative example 4
Adhesive composition:
foam rubber layer composition
Coating the foam adhesive layer composition on a release film with the thickness of 1mm, coating the release film on the surface, curing, and performing double-sided UV irradiation with the energy of 2 x 400mj/cm2Coating adhesive layer composition on both sides of the foam layer with thickness of 100um, curing the coating film with energy of 400mj/cm2And obtaining the foam adhesive tape.
Attaching the foam adhesive tape to a steel plate, testing the shear strength of the foam adhesive tape by adopting a stretcher, and observing the failure mode of the foam adhesive tape by naked eyes.
The test results are shown in the following table:
| shear strength | Failure mode | |
| Example 1 | 356N | Interface between steel plate and adhesive |
| Example 2 | 183N | Interface between steel plate and adhesive |
| Example 3 | 239N | Interface between steel plate and adhesive |
| Example 4 | 156N | Interface between steel plate and adhesive |
| Example 5 | 624N | Interface between steel plate and adhesive |
| Comparative example 1 | 62N | Interface between steel plate and adhesive |
| Comparative example 2 | 73N | Adhesive to foam interface |
| Comparative example 3 | 40N | Adhesive to foam interface |
| Comparative example 4 | 72N | Adhesive to foam interface |
From the table above, it can be seen that the foam tapes of embodiments 1-5 have high shear strength, the bonding strength between the foam adhesive layer and the adhesive layer is high, and the failure mode is the interface between the steel plate and the adhesive. The foam tapes of comparative examples 1 to 4 have low shear strength and low overall strength. The acting force of the adhesive layer and the foam adhesive layer in the foam adhesive tape is low in comparative examples 2-3, and the failure mode is the interface of the adhesive and the foam.
It should be noted that the embodiments are merely illustrative of the technical solutions of the present invention, and should not be construed as limiting the technical solutions of the present invention, and any modifications that adopt the spirit of the present invention and are only partially changed should still fall within the scope of the present invention.
Claims (6)
1. The foam adhesive tape is characterized by comprising a foam adhesive layer (1), adhesive layers (2) arranged on the upper side and the lower side of the foam adhesive layer and at least one layer of release film (3), wherein the release film is arranged on one side of the adhesive layer far away from the foam adhesive layer, and the interface of the foam adhesive layer and the adhesive layer is combined through a chemical bond; the material of bubble cotton glue film includes: the functionalities of the oligomer and the monomer are less than or equal to 3, and the oligomer accounts for not less than 20% of the weight of the foam adhesive layer; the material of the adhesive layer includes: oligomer, monomer and photoinitiator, wherein the functionality of the oligomer and the monomer is less than or equal to 3, and the oligomer accounts for not less than 20% of the weight of the adhesive layer; the oligomer is acrylate oligomer, and the monomer is acrylate monomer; the preparation method of the foam adhesive tape comprises the following steps:
s1) uniformly mixing the oligomer with the functionality of less than or equal to 3, the monomer with the functionality of less than or equal to 3, the photoinitiator and the hollow particles to obtain a foam adhesive layer composition, coating the foam adhesive layer composition on a release film, and carrying out double-sided UV (ultraviolet) curing to form a semi-cured foam adhesive layer;
s2) uniformly mixing an oligomer with the functionality of less than or equal to 3, a monomer with the functionality of less than or equal to 3 and a photoinitiator to obtain an adhesive layer composition, coating the adhesive layer composition on one side of a foam adhesive layer far away from a release film, and curing by ultraviolet light to form an adhesive layer, wherein the interface of the adhesive layer and the foam adhesive layer is combined through a chemical bond;
s3) removing the release film, coating an adhesive layer composition on the other side of the foam adhesive layer, and performing ultraviolet curing to form an adhesive layer, wherein the interface of the adhesive layer and the foam adhesive layer is combined through a chemical bond;
s4) attaching a release film to one side of the at least one adhesive layer to form the foam adhesive tape.
2. The foam tape according to claim 1, wherein the oligomer accounts for 30-50 wt% of the foam adhesive layer.
3. The foam tape according to claim 1, wherein the oligomer accounts for 30-50 wt% of the adhesive layer.
4. The foam adhesive tape according to claim 1, wherein the thickness of the foam adhesive layer is 0.1-2 mm, and the thickness of the adhesive layer is 50-200 μm.
5. The foam tape according to claim 1, wherein in the step S1), the thickness of the foam adhesive layer is 0.1mm-2mm, and the double bond conversion rate of the foam adhesive layer composition is 40-90%.
6. The foam tape according to claim 1, wherein the step S1) further comprises coating a release film on the foam adhesive layer composition before or after the double-sided UV curing step.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747847A (en) * | 2008-12-04 | 2010-06-23 | 日东电工株式会社 | Double-faced adhesive tape |
| CN101831252A (en) * | 2009-03-11 | 2010-09-15 | 日东电工株式会社 | Acrylic pressure-sensitive adhesive sheet |
| CN106674417A (en) * | 2016-09-10 | 2017-05-17 | 东莞市富印胶粘科技有限公司 | Acrylic foam tape composition and method for preparing acrylic foam tape composition |
| CN107216821A (en) * | 2016-03-22 | 2017-09-29 | 琳得科株式会社 | The manufacture method of double-faced pressure-sensitive adhesive sheet, display body and display body |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747847A (en) * | 2008-12-04 | 2010-06-23 | 日东电工株式会社 | Double-faced adhesive tape |
| CN101831252A (en) * | 2009-03-11 | 2010-09-15 | 日东电工株式会社 | Acrylic pressure-sensitive adhesive sheet |
| CN107216821A (en) * | 2016-03-22 | 2017-09-29 | 琳得科株式会社 | The manufacture method of double-faced pressure-sensitive adhesive sheet, display body and display body |
| CN106674417A (en) * | 2016-09-10 | 2017-05-17 | 东莞市富印胶粘科技有限公司 | Acrylic foam tape composition and method for preparing acrylic foam tape composition |
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