CN107033794B - OCA optical cement and preparation method thereof - Google Patents
OCA optical cement and preparation method thereof Download PDFInfo
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- CN107033794B CN107033794B CN201710300794.7A CN201710300794A CN107033794B CN 107033794 B CN107033794 B CN 107033794B CN 201710300794 A CN201710300794 A CN 201710300794A CN 107033794 B CN107033794 B CN 107033794B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2451/00—Presence of graft polymer
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Abstract
The invention provides a preparation method of OCA optical cement, which comprises the following steps: a) coating OCA optical glue on the heavy release film to obtain a glue layer to be treated; the OCA optical glue comprises a first soft glue layer glue, a hard glue layer glue and a second soft glue layer glue from bottom to top in sequence; b) sequentially carrying out thermosetting and metal halogen lamp curing on the adhesive layer to be treated obtained in the step a) to obtain a cured composite adhesive layer; c) attaching a light release film to the cured composite adhesive layer obtained in the step b) to obtain the OCA optical adhesive. Compared with the prior art, the preparation method of the OCA optical cement provided by the invention adopts the composite overlapped OCA optical cement, and segmented curing is carried out through a specific curing mode, so that the obtained OCA optical cement has high curing degree, good curing effect and better mechanical property. Experimental results show that the curing degree of the OCA optical cement provided by the invention is 100%, no air bubble exists in the curing process, the stripping force is not obviously changed after curing, and the product has high strength and large elasticity.
Description
Technical Field
The invention relates to the technical field of adhesive materials, in particular to OCA optical cement and a preparation method thereof.
Background
The OCA optical adhesive is a special double-sided adhesive with optical transparency and no base material, is used for cementing transparent optical elements, has the characteristics of colorless transparency, light transmittance of over 90 percent, good cementing strength, capability of being cured at room temperature or intermediate temperature, small curing shrinkage and the like, and is one of the raw materials of important touch screens.
At present, the OCA optical cement in the market is prepared by making OCA optical cement into a non-substrate, then respectively attaching a layer of release film on the upper surface and the lower surface, and is mainly used in a mobile phone screen for bonding an ITO film, an ITO film and a plastic nameplate. However, in the prior art, the OCA optical cement is generally formed by photocuring in production, and due to the large thickness of the glue layer, the problems of incomplete curing and poor curing effect often exist in production, so that the production yield of the OCA optical cement is limited; the layered curing and recombination method can improve the curing degree, but can adversely affect the mechanical properties of the product.
Disclosure of Invention
In view of the above, the present invention aims to provide an OCA optical cement and a preparation method thereof, and the OCA optical cement obtained by the preparation method provided by the present invention has the advantages of high curing degree, good curing effect and good mechanical properties.
The invention provides a preparation method of OCA optical cement, which comprises the following steps:
a) coating OCA optical glue on the heavy release film to obtain a glue layer to be treated; the OCA optical glue comprises a first soft glue layer glue, a hard glue layer glue and a second soft glue layer glue from bottom to top in sequence;
b) sequentially carrying out thermosetting and metal halogen lamp curing on the adhesive layer to be treated obtained in the step a) to obtain a cured composite adhesive layer;
c) attaching a light release film to the cured composite adhesive layer obtained in the step b) to obtain the OCA optical adhesive.
Preferably, the thickness of the heavy release film in the step a) is 50 to 200 μm, and the release force is 50 to 100 g/f.
Preferably, the coating mode of the OCA optical cement in the step a) is multilayer co-extrusion coating.
Preferably, the first soft glue layer glue in the step a) is OCA optical glue comprising resin, UV photoinitiator, coupling agent and hardening agent, and the mass ratio of the resin, the UV photoinitiator, the coupling agent and the hardening agent in the first soft glue layer glue is (80-95): (0.1-5): (0.3-5): (0.01 to 0.1);
the coating thickness of the first soft glue layer is 50-100 mu m.
Preferably, the glue for the hard glue layer in the step a) is OCA optical glue comprising resin, a UV photoinitiator, a coupling agent, a hardening agent and a diluent, and the mass ratio of the resin, the UV photoinitiator, the coupling agent, the hardening agent and the diluent in the glue for the hard glue layer is (80-95): (0.1-5): (0.3-5): (0.5-5): (10-40);
the coating thickness of the hard glue layer glue is 20-30 mu m.
Preferably, the second soft glue layer glue in the step a) is OCA optical glue comprising resin, UV photoinitiator, coupling agent, hardening agent and diluent, and the mass ratio of the resin, the UV photoinitiator, the coupling agent, the hardening agent and the diluent in the second soft glue layer glue is (80-95): (0.1-5): (0.3-5): (0.01-0.1): (10-40);
the coating thickness of the second soft glue layer is 30-70 μm.
Preferably, the thermal curing in step b) is carried out in a thermal curing section; the hot curing section comprises 5-10 sections of ovens, the temperature of each oven is 50-110 ℃, the temperature of adjacent ovens is different, and the temperature difference of the adjacent ovens is 10-20 ℃;
the time for thermal curing is 60 s-300 s.
Preferably, the metal halogen lamp curing in step b) is performed in a metal halogen lamp curing section; the number of the metal halogen lamps in the metal halogen lamp curing section is 2-8, the adjacent metal halogen lamps are vertically staggered by taking the glue layer to be treated as a plane, the horizontal distance between the adjacent metal halogen lamps is 15-30 cm, and the vertical distance between each metal halogen lamp and the glue layer to be treated is 5-10 cm;
the wavelength of the metal halogen lamp is 350 nm-450 nm, and the time is 30 s-180 s.
Preferably, the thickness of the light release film in the step c) is 25 to 200 μm, and the release force is 1 to 15 g/f.
The invention also provides an OCA optical cement which is prepared by the preparation method of the technical scheme.
The invention provides a preparation method of OCA optical cement, which comprises the following steps: a) coating OCA optical glue on the heavy release film to obtain a glue layer to be treated; the OCA optical glue comprises a first soft glue layer glue, a hard glue layer glue and a second soft glue layer glue from bottom to top in sequence; b) sequentially carrying out thermosetting and metal halogen lamp curing on the adhesive layer to be treated obtained in the step a) to obtain a cured composite adhesive layer; c) attaching a light release film to the cured composite adhesive layer obtained in the step b) to obtain the OCA optical adhesive. Compared with the prior art, the preparation method of the OCA optical cement provided by the invention adopts the composite overlapped OCA optical cement, and segmented curing is carried out through a specific curing mode, so that the obtained OCA optical cement has high curing degree, good curing effect and better mechanical property. Experimental results show that the curing degree of the OCA optical cement provided by the invention is 100%, no air bubble exists in the curing process, the stripping force is not obviously changed after curing, and the product has high strength and large elasticity.
Drawings
Fig. 1 is a schematic structural diagram of the OCA optical cement provided by the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a preparation method of OCA optical cement, which comprises the following steps:
a) coating OCA optical glue on the heavy release film to obtain a glue layer to be treated; the OCA optical glue comprises a first soft glue layer glue, a hard glue layer glue and a second soft glue layer glue from bottom to top in sequence;
b) sequentially carrying out thermosetting and metal halogen lamp curing on the adhesive layer to be treated obtained in the step a) to obtain a cured composite adhesive layer;
c) attaching a light release film to the cured composite adhesive layer obtained in the step b) to obtain the OCA optical adhesive.
The method comprises the step of coating OCA optical glue on a heavy release film to obtain a glue layer to be treated. In the invention, the substrate of the heavy release film is preferably PET, PVC, PC, PE, PP or OPP, more preferably PET; the source of the heavy release film is not particularly limited in the present invention, and commercially available products of heavy release films whose base material is PET, PVC, PC, PE, PP or OPP, which are well known to those skilled in the art, may be used. In the present invention, the thickness of the heavy release film is preferably 50 μm to 200 μm, and more preferably 100 μm; the release force of the heavy release film is preferably 50g/f to 100g/f, and more preferably 80 g/f.
In the invention, the OCA optical glue comprises a first soft glue layer, a hard glue layer and a second soft glue layer from bottom to top in sequence. In the invention, the first soft glue layer glue is preferably OCA optical glue comprising resin, UV photoinitiator, coupling agent and hardening agent. In the invention, the resin in the first soft glue layer glue is preferably one or more of acrylic resin, polyurethane resin and epoxy polyester resin, and is more preferably acrylic resin; the mass ratio of the resin, the UV photoinitiator, the coupling agent and the hardening agent in the first soft glue layer glue is preferably (80-95): (0.1-5): (0.3-5): (0.01 to 0.1), more preferably 95: 2.5: 2.45: 0.05. the source of the first soft glue layer is not particularly limited, and commercially available products well known to those skilled in the art can be adopted. In the invention, the coating thickness of the first soft glue layer is preferably 50-100 μm, and more preferably 80 μm.
In the present invention, the hardcoat glue is preferably an OCA optical glue comprising a resin, a UV photoinitiator, a coupling agent, a hardener, and a diluent. In the present invention, the resin in the hard glue is preferably one or more of acrylic resin, polyurethane resin and epoxy polyester resin, and more preferably acrylic resin; the mass ratio of the resin, the UV photoinitiator, the coupling agent, the hardening agent and the diluent in the hard glue layer glue is preferably (80-95): (0.1-5): (0.3-5): (0.5-5): (10-40), more preferably 81: 2.5: 2.5: 4: 10. the source of the hard size glue is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the invention, the coating thickness of the hard glue layer is preferably 20-30 μm, and more preferably 20 μm.
In the invention, the second soft glue layer glue is preferably OCA optical glue comprising resin, UV photoinitiator, coupling agent, hardener and diluent. In the invention, the resin in the second soft glue layer glue is preferably one or more of acrylic resin, polyurethane resin and epoxy polyester resin, and is more preferably acrylic resin; the mass ratio of the resin, the UV photoinitiator, the coupling agent, the hardening agent and the diluent in the second soft glue layer glue is preferably (80-95): (0.1-5): (0.3-5): (0.01-0.1): (10-40), more preferably 81: 2.5: 2.45: 0.05: 14. the source of the second soft glue layer is not particularly limited, and commercially available products well known to those skilled in the art can be adopted. In the invention, the coating thickness of the second soft glue layer is preferably 30-70 μm, and more preferably 50 μm.
In the invention, the coating mode of the OCA optical glue is preferably multilayer coextrusion coating, and more preferably three-layer coextrusion coating. The invention adopts multilayer co-extrusion coating to enable OCA optical glue with different components to be compositely superposed and to be coated at one time.
After the adhesive layer to be treated is obtained, the obtained adhesive layer to be treated is subjected to thermosetting and metal halogen lamp curing in sequence to obtain a cured composite adhesive layer. In the present invention, the heat curing is preferably performed in a heat curing section. In the invention, the hot curing section preferably comprises 5-10 sections of ovens, more preferably 7 sections of ovens; the ovens are communicated in sequence and arranged to form a thermal curing section. In the invention, the temperature of the oven is preferably 50-110 ℃, the temperature of the adjacent ovens is different, and the temperature difference of the adjacent ovens is preferably 10-20 ℃. In a preferred embodiment of the present invention, the heat-curing section is formed by 7-stage ovens having temperatures of 50 ℃, 60 ℃, 80 ℃, 100 ℃, 110 ℃, 90 ℃ and 70 ℃ in this order. In the present invention, the time for the heat curing is preferably 60s to 300s, and more preferably 70s to 120 s.
In the present invention, the metal halogen lamp curing is preferably performed in a metal halogen lamp curing section. In the present invention, the number of the metal halogen lamps in the metal halogen lamp curing section is preferably 2 to 8; the adjacent metal halogen lamps are staggered up and down by taking the glue layer to be treated as a plane, namely: the first metal halogen lamp is arranged above the glue layer to be treated, the second metal halogen lamp is arranged below the glue layer to be treated, the third metal halogen lamp is arranged above the glue layer to be treated, the fourth metal halogen lamp is arranged below the glue layer to be treated, and the like; and the horizontal distance between adjacent metal halide lamps is preferably 15cm to 30 cm; the vertical distance between each metal halogen lamp and the glue layer to be treated is preferably 5 cm-10 cm. In the present invention, since the irradiation of the metal halide lamp in the metal halide lamp curing section can be realized within a certain range, the length of the metal halide lamp curing section includes the horizontal distance between the head and tail metal halide lamps of an adjacent metal halide lamp, that is: when the number of the metal halogen lamps is 2, the length of the curing section of the metal halogen lamp is the horizontal distance of 2 adjacent metal halogen lamps; when the number of the metal halogen lamps is 8, the length of the curing section of the metal halogen lamp is the horizontal distance of 8 adjacent metal halogen lamps.
In the present invention, the wavelength of curing of the metal halide lamp is preferably 350nm to 450 nm; the curing time of the metal halide lamp is 30s to 180s, more preferably 100s to 150 s.
In the invention, the thermosetting section is connected with the metal halogen lamp curing section, so that the glue layer to be treated continuously passes through the thermosetting section and the metal halogen lamp curing section in sequence to complete the curing process, and the cured composite glue layer is obtained. In the invention, the cured composite adhesive layer sequentially comprises a heavy release film, a first soft adhesive layer, a hard adhesive layer and a second soft adhesive layer from bottom to top.
After the cured composite adhesive layer is obtained, the light release film is attached to the cured composite adhesive layer to obtain the OCA optical adhesive. In the present invention, the base material of the light release film is preferably PET, PVC, PC, PE, PP or OPP, more preferably PET; the source of the light release film is not particularly limited in the present invention, and commercially available light release films whose base material is PET, PVC, PC, PE, PP or OPP, which are well known to those skilled in the art, may be used. In the present invention, the thickness of the light release film is preferably 25 μm to 200 μm, and more preferably 50 μm; the release force of the light release film is preferably 1g/f to 15g/f, and more preferably 10 g/f.
The invention also provides an OCA optical cement which is prepared by the preparation method of the technical scheme. In the present invention, the OCA optical cement includes:
heavy release film;
the first soft adhesive layer is compounded on the heavy release film;
a hard adhesive layer compounded on the first soft adhesive layer;
the second soft adhesive layer is compounded on the hard adhesive layer;
and the light release film is compounded on the second soft rubber layer.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an OCA optical adhesive provided in the present invention, in which 1 is a heavy release film, 2 is a first soft adhesive layer, 3 is a hard adhesive layer, 4 is a second soft adhesive layer, and 5 is a light release film.
The invention provides a preparation method of OCA optical cement, which comprises the following steps: a) coating OCA optical glue on the heavy release film to obtain a glue layer to be treated; the OCA optical glue comprises a first soft glue layer glue, a hard glue layer glue and a second soft glue layer glue from bottom to top in sequence; b) sequentially carrying out thermosetting and metal halogen lamp curing on the adhesive layer to be treated obtained in the step a) to obtain a cured composite adhesive layer; c) attaching a light release film to the cured composite adhesive layer obtained in the step b) to obtain the OCA optical adhesive. Compared with the prior art, the preparation method of the OCA optical cement provided by the invention adopts the composite overlapped OCA optical cement, and segmented curing is carried out through a specific curing mode, so that the obtained OCA optical cement has high curing degree, good curing effect and better mechanical property. Experimental results show that the curing degree of the OCA optical cement provided by the invention is 100%, no air bubble exists in the curing process, the stripping force is not obviously changed after curing, and the product has high strength and large elasticity.
To further illustrate the present invention, the following examples are provided for illustration. The OCA optical glues (including soft glue layer and hard glue layer) used in the following examples of the present invention are all provided by new material science and technology ltd, gulepong, guangdong, province.
Example 1
(1) On heavily leaving the type membrane from type that the power is 80g/f, thickness is 100 mu m, adopt the coating mode of three-layer coextrusion, once only coat the thick OCA optics glue of one deck 150 mu m, OCA optics glue is first flexible glue layer glue, ebonite layer glue and second flexible glue layer glue from bottom to top in proper order, and wherein, the component of first flexible glue layer glue is: 95 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.45 wt% of acrylic coupling agent, 0.05 wt% of hardener, 100% of solid content and 80 μm of coating thickness; the glue for the hard glue layer comprises the following components: 81 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.5 wt% of acrylic coupling agent, 4 wt% of hardener, 10 wt% of diluent, 85% of solid content and 20 mu m of coating thickness; the second soft glue layer glue comprises the following components: 81 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.45 wt% of acrylic coupling agent, 0.05 wt% of hardener, 14 wt% of diluent, 70% of solid content and 50 μm of coating thickness, thus obtaining a glue layer to be treated;
(2) sequentially carrying out thermal curing on the glue layer to be treated for 90s through a thermal curing section (7 sections of ovens with the temperatures of 50 ℃, 60 ℃, 80 ℃, 100 ℃, 110 ℃, 90 ℃ and 70 ℃) and a metal halogen lamp curing section (6 metal halogen lamps with the horizontal distance of 20cm and the vertical distance of 8cm between each metal halogen lamp and the glue layer to be treated) for 120s through metal halogen lamp curing, so as to obtain a cured composite glue layer, wherein the cured composite glue layer sequentially comprises a heavy release film, a first soft glue layer, a hard glue layer and a second soft glue layer from bottom to top;
(3) and covering a layer of light release film with the release force of 10g/f and the thickness of 50 mu m on the second soft rubber layer of the cured composite rubber layer to obtain the OCA optical adhesive.
The shore hardness of the first soft adhesive layer is 20D, the shore hardness of the hard adhesive layer is 38D, and the shore hardness of the second soft adhesive layer is 20D according to an LX-D shore rubber hardness tester provided by Beijing Erguoji scientific and technology Limited.
Example 2
(1) On the heavy release film that is 80g/f from type power, thickness are 100 mu m, adopt the coating mode of three-layer coextrusion, the thick OCA optics glue of one deck 100 mu m of disposable coating, OCA optics glue is first flexible glue layer glue, ebonite layer glue and second flexible glue layer glue from bottom to top in proper order, and wherein, the component of first flexible glue layer glue is: 95 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.45 wt% of acrylic coupling agent, 0.05 wt% of hardener, 100% of solid content and 50 μm of coating thickness; the glue for the hard glue layer comprises the following components: 81 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.5 wt% of acrylic coupling agent, 4 wt% of hardener, 10 wt% of diluent, 85% of solid content and 20 mu m of coating thickness; the second soft glue layer glue comprises the following components: 81 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.45 wt% of acrylic coupling agent, 0.05 wt% of hardener, 14 wt% of diluent, 70% of solid content and 30 mu m of coating thickness, thus obtaining a glue layer to be treated;
(2) sequentially carrying out thermosetting 70s on an adhesive layer to be treated and a metal halogen lamp curing section (8 metal halogen lamps with the horizontal distance of 20cm and the vertical distance of 10cm between each metal halogen lamp and the adhesive layer to be treated) by a thermosetting section (7 sections of ovens with the temperature of 50 ℃, 60 ℃, 80 ℃, 100 ℃, 110 ℃, 90 ℃ and 70 ℃) for 100s, so as to obtain a cured composite adhesive layer, wherein the cured composite adhesive layer sequentially comprises a heavy release film, a first soft adhesive layer, a hard adhesive layer and a second soft adhesive layer from bottom to top;
(3) covering a layer of light release film with the release force of 10g/f and the thickness of 50 mu m on the second soft rubber layer of the cured composite rubber layer to obtain the OCA optical rubber, wherein the curing degree of the product is 100%; the shore hardness of the first soft adhesive layer is 20D, the shore hardness of the hard adhesive layer is 38D, and the shore hardness of the second soft adhesive layer is 20D.
Example 3
(1) On heavily leaving the type membrane from type that the power is 80g/f, thickness is 100 mu m, adopt the coating mode of three-layer coextrusion, once only coat the thick OCA optics glue of one deck 200 mu m, OCA optics glue is first flexible glue layer glue, ebonite layer glue and second flexible glue layer glue from bottom to top in proper order, and wherein, the component of first flexible glue layer glue is: 95 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.45 wt% of acrylic coupling agent, 0.05 wt% of hardener, 100% of solid content and 100 μm of coating thickness; the glue for the hard glue layer comprises the following components: 81 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.5 wt% of acrylic coupling agent, 4 wt% of hardener, 10 wt% of diluent, 85% of solid content and 30 mu m of coating thickness; the second soft glue layer glue comprises the following components: 81 wt% of acrylic resin, 2.5 wt% of UV photoinitiator, 2.45 wt% of acrylic coupling agent, 0.05 wt% of hardener, 14 wt% of diluent, 70% of solid content and 70 μm of coating thickness, thus obtaining a glue layer to be treated;
(2) performing thermal curing on the adhesive layer to be treated for 120s by a thermal curing section (7 sections of ovens with the temperature of 50 ℃, 60 ℃, 80 ℃, 100 ℃, 110 ℃, 90 ℃ and 70 ℃) and performing metal halogen lamp curing section (4 450nm metal halogen lamps, the adjacent metal halogen lamps are staggered up and down by taking the adhesive layer to be treated as a plane, the horizontal distance is 20cm, the vertical distance between each metal halogen lamp and the adhesive layer to be treated is 5cm) for 150s by using the metal halogen lamps to perform metal halogen lamp curing, so as to obtain a cured composite adhesive layer, wherein the cured composite adhesive layer sequentially comprises a heavy release film, a first soft adhesive layer, a hard adhesive layer and a second soft adhesive layer from bottom to top;
(3) covering a layer of light release film with the release force of 10g/f and the thickness of 50 mu m on the second soft rubber layer of the cured composite rubber layer to obtain the OCA optical rubber, wherein the curing degree of the product is 100%; the shore hardness of the first soft adhesive layer is 20D, the shore hardness of the hard adhesive layer is 38D, and the shore hardness of the second soft adhesive layer is 20D.
Comparative example 1
Coating a layer of soft glue layer glue (acrylic resin 95 wt%, UV photoinitiator 2.5 wt%, acrylic acid coupling agent 2.45 wt%, hardening agent 0.05 wt% and solid content 100%) with the thickness of 200 mu m on a heavy release film with the release force of 80g/f and the thickness of 100 mu m, carrying out thermosetting for 270s through a thermosetting section (an oven with the temperature of 7 sections being 50 ℃, 60 ℃, 80 ℃, 100 ℃, 110 ℃, 90 ℃ and 70 ℃ in sequence) to obtain a cured soft glue layer, and then coating a layer of light release film with the release force of 10g/f and the thickness of 50 mu m on the cured soft glue layer to obtain the OCA optical glue, wherein the curing degree of the product is 85%, and the Shore hardness of the soft glue layer is 15.2D.
Comparative example 2
Coating a layer of glue (acrylic resin 95 wt%, UV photoinitiator 2.5 wt%, acrylic coupling agent 2.45 wt%, hardening agent 0.05 wt% and solid content 100%) with a thickness of 200 μm on a heavy release film with a release force of 80g/f and a thickness of 100 μm, carrying out metal halogen lamp curing for 270s by using 4 metal halogen lamps with a wavelength of 450nm, wherein adjacent metal halogen lamps are vertically staggered by using the film surface of the release film coated with OCA optical glue as a plane, the horizontal distance is 20cm, the vertical distance between each metal halogen lamp and the film surface of the release film coated with OCA optical glue is 5cm, thus obtaining a cured soft glue layer, coating a layer of release force of 10g/f on the cured soft glue layer, and obtaining the OCA optical adhesive by using the light release film with the thickness of 50 mu m, wherein the curing degree of the product is 90%, and the Shore hardness of the soft adhesive layer is 16.1D.
The performance of the OCA optical adhesives provided in examples 1 to 3 and comparative examples 1 to 2 of the present invention was tested, and the results are shown in table 1.
TABLE 1 Performance data for OCA optical adhesives provided in inventive examples 1-3 and comparative examples 1-2
As can be seen from table 1, compared with the preparation methods of the OCA optical cement provided in comparative examples 1 to 2, the preparation methods of the OCA optical cement provided in embodiments 1 to 3 of the present invention can solve the technical problems of incomplete curing and poor curing effect due to excessive thickness in the production process of the OCA optical cement, reduce bubbles in the cement, increase the production yield, and improve the mechanical properties of the product.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A preparation method of OCA optical cement comprises the following steps:
a) coating OCA optical glue on the heavy release film to obtain a glue layer to be treated; the OCA optical glue is coated in a multi-layer co-extrusion coating mode; the OCA optical glue comprises a first soft glue layer glue, a hard glue layer glue and a second soft glue layer glue from bottom to top in sequence;
b) sequentially carrying out thermosetting and metal halogen lamp curing on the adhesive layer to be treated obtained in the step a) to obtain a cured composite adhesive layer; the thermal curing is carried out in a thermal curing section; the hot curing section comprises 5-10 sections of ovens, the temperature of each oven is 50-110 ℃, the temperature of adjacent ovens is different, and the temperature difference of the adjacent ovens is 10-20 ℃;
the thermosetting time is 60-300 s;
the metal halogen lamp curing is performed in a metal halogen lamp curing section; the number of the metal halogen lamps in the metal halogen lamp curing section is 2-8, the adjacent metal halogen lamps are vertically staggered by taking the glue layer to be treated as a plane, the horizontal distance between the adjacent metal halogen lamps is 15-30 cm, and the vertical distance between each metal halogen lamp and the glue layer to be treated is 5-10 cm;
the wavelength of the metal halogen lamp is 350 nm-450 nm, and the time is 30 s-180 s;
c) attaching a light release film to the cured composite adhesive layer obtained in the step b) to obtain the OCA optical adhesive.
2. The preparation method according to claim 1, wherein the thickness of the heavy release film in the step a) is 50 to 200 μm, and the release force is 50 to 100 g/f.
3. The preparation method of claim 1, wherein the first soft glue layer glue in the step a) is OCA optical glue comprising resin, UV photoinitiator, coupling agent and hardening agent, and the mass ratio of the resin, the UV photoinitiator, the coupling agent and the hardening agent in the first soft glue layer glue is (80-95): (0.1-5): (0.3-5): (0.01 to 0.1);
the coating thickness of the first soft glue layer is 50-100 mu m.
4. The preparation method of claim 1, wherein the hard gum layer glue in the step a) is an OCA optical glue comprising a resin, a UV photoinitiator, a coupling agent, a hardening agent and a diluent, and the mass ratio of the resin, the UV photoinitiator, the coupling agent, the hardening agent and the diluent in the hard gum layer glue is (80-95): (0.1-5): (0.3-5): (0.5-5): (10-40);
the coating thickness of the hard glue layer glue is 20-30 mu m.
5. The preparation method of claim 1, wherein the second soft glue layer glue in the step a) is OCA optical glue comprising resin, UV photoinitiator, coupling agent, hardening agent and diluent, and the mass ratio of the resin, the UV photoinitiator, the coupling agent, the hardening agent and the diluent in the second soft glue layer glue is (80-95): (0.1-5): (0.3-5): (0.01-0.1): (10-40);
the coating thickness of the second soft glue layer is 30-70 μm.
6. The preparation method according to claim 1, wherein the thickness of the light release film in step c) is 25 to 200 μm, and the release force is 1 to 15 g/f.
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| CN109536051A (en) * | 2018-12-07 | 2019-03-29 | 深圳市宝力新材料有限公司 | A kind of low dielectric OCA optical cement, optical adhesive film and its membrane preparation method |
| CN111334217B (en) * | 2020-05-18 | 2020-08-04 | 苏州世华新材料科技股份有限公司 | Regionally cured high-filling AB adhesive, and preparation method and application thereof |
| CN112724891A (en) * | 2020-12-17 | 2021-04-30 | 深圳昌茂粘胶新材料有限公司 | Anti-counterfeiting temperature-resistant double-sided adhesive without base material carrier and preparation method thereof |
| CN114686128A (en) * | 2020-12-31 | 2022-07-01 | 太湖金张科技股份有限公司 | OCA optical adhesive tape and processing technology thereof |
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| WO2014130507A1 (en) * | 2013-02-22 | 2014-08-28 | Avery Dennison Corporation | Multi-layer optically clear adhesives, foams, transfer tapes, and articles comprising such adhesives |
| CN105315911B (en) * | 2015-11-26 | 2018-07-13 | 东莞市纳利光学材料有限公司 | A kind of ultra-thin OCA optical adhesive films and preparation method thereof |
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