Ultralow-temperature double-faced adhesive tape and manufacturing process thereof

Abstract

The ultralow-temperature double-sided adhesive tape is sequentially provided with first release paper, a first adhesive layer, a first composite layer, a base layer, a second composite layer, a second adhesive layer and second release paper from the upper surface to the lower surface, both the first adhesive layer and the second adhesive layer are formed by coating and curing pressure-sensitive glue, and the thickness ratio of the first composite layer to the base layer to the second composite layer is (0.4-0.7): 1: (0.4-0.7). According to the double-sided adhesive tape, the first composite layer, the base layer and the second composite layer which are integrally formed are arranged, and the low-temperature pressure-sensitive glue with the core-shell structure is prepared, so that the low-temperature resistance of the glue is improved, and the low-temperature pressure-sensitive glue has the advantages that the low-temperature resistance of the double-sided adhesive tape is improved, and the service life of the double-sided adhesive tape is prolonged. Meanwhile, the low-temperature pressure-sensitive glue is arranged in the pressure-sensitive glue shell to form the adhesive microcapsules, so that the pressure-sensitive glue is broken under the low-temperature condition, the low-temperature pressure-sensitive glue flows out of the adhesive microcapsules, pressure-sensitive glue gaps caused by low temperature are made up, and the adhesion effect of the double-sided adhesive tape is improved.

Description

Technical Field

[0001] The invention relates to the technical field of double-sided adhesive tapes, in particular to an ultra-low temperature double-sided adhesive tape and a manufacturing process thereof. Background Art

[0002] Double-sided tape is a roll of adhesive tape made of paper, cloth, plastic film, elastomer pressure-sensitive adhesive or resin pressure-sensitive adhesive. Double-sided tape has good operability and high bonding properties, and can be used as a bonding "bridge" to bond two objects. Due to its good bonding stability and easy use, double-sided tape is often used to replace the original mechanical fixing structures such as rivets and screws, and is widely used in mobile phones, computers, new energy vehicles, home appliances and other fields.

[0003] Since the existing double-sided adhesive is generally used in high temperature environment, it is generally developed in the direction of high temperature resistance. However, for use in northern winter or refrigeration, the adhesion of the adhesive will be significantly reduced with the change of temperature. Especially under low temperature conditions, the adhesive substance in the adhesive is in a vitrified state, and the molecular chain is frozen, resulting in a significant reduction in the adhesive bonding effect and inability to effectively adhere. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-low temperature double-sided adhesive and a manufacturing process thereof to solve the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical scheme: an ultra-low temperature double-sided adhesive, which is provided with a first release paper, a first adhesive layer, a first composite layer, a base layer, a second composite layer, a second adhesive layer and a second release paper in sequence from the upper surface to the lower surface, the first adhesive layer and the second adhesive layer are both formed by coating and curing pressure-sensitive adhesive, the thickness ratio of the first composite layer, the base layer and the second composite layer is 0.4~0.7:1:0.4~0.7, the composite layer is specifically a nanofiber layer, and the nanofiber is filled with binder microcapsules.

[0008] As a further preference, the pressure-sensitive adhesive is prepared from acrylic pressure-sensitive adhesive latex and filler in a mass ratio of 100:5.8-9.6.

[0009] As a further preference, the adhesive microcapsule comprises a pressure-sensitive glue shell and low-temperature pressure-sensitive glue, and the low-temperature pressure-sensitive glue is arranged in the pressure-sensitive glue shell.

[0010] As a further preference, the low temperature pressure-sensitive adhesive is prepared from the following raw materials in parts by weight:

[0011] Core-shell structure acrylate oligomer 30-40%;

[0012] Active diluent 50-60%;

[0013] Active agent 0.5-1%;

[0014] Photoinitiator 1-10%;

[0015] Coupling agent 0.1-2%;

[0016] The core-shell structured acrylic ester oligomer is prepared from a hard monomer, a soft monomer and a functional monomer through a multiple emulsion method.

[0017] As further preferred, the core-shell structure acrylate oligomer:

[0018] S1, ultrasonically mixing the hard monomer, the soft monomer and the functional monomer with an emulsifier, an initiator and deionized water to obtain a core emulsion;

[0019] S2, ultrasonically mixing the hard monomer, the soft monomer and the functional monomer with an emulsifier and deionized water to obtain a shell emulsion;

[0020] S3, mixing the initiator, emulsifier and deionized water in a volume ratio of 1:4:5 to form a base liquid;

[0021] S4, adding a mixture of hard monomers, soft monomers and functional monomers to the base liquid, and then dropping the core emulsion, shell emulsion and initiator in sequence, raising the temperature, heating and aging the system, cooling and filtering, and eluting the emulsifier and initiator, and finally rotary evaporating to remove water to obtain a core-shell structured acrylate oligomer.

[0022] As a further preference, the preparation process of the adhesive microcapsule includes: dissolving and stirring the pressure-sensitive adhesive and the low-temperature pressure-sensitive adhesive respectively to form an external phase solution and an internal phase solution, forming a wrapping liquid through a microfluidic extrusion device, and solidifying the wrapping liquid to form an adhesive microcapsule.

[0023] As a further preference, the first composite layer, the base layer and the second composite layer are integrally formed by electrospinning, and the fiber diameter of the first composite layer is 800-1000nm, the fiber diameter of the base layer is 400-600nm, and the fiber diameter of the second composite layer is 800-1000nm.

[0024] As a further preferred embodiment, a manufacturing process of an ultra-low temperature double-sided adhesive tape comprises:

[0025] Step 1: soaking the first composite layer, the base layer and the second composite layer assembly formed in one piece into a solution-like adhesive capsule;

[0026] Step 2: taking out the soaked assembly and drying it, applying pressure-sensitive adhesive on one side of the dried assembly and curing it to form a first adhesive layer;

[0027] Step 3: Cover the first adhesive layer with the first release paper;

[0028] Step 4: Apply pressure-sensitive adhesive on the other side of the assembly, solidify it to form a second adhesive layer, and cover the second release paper on the second adhesive layer to form a double-sided adhesive.

[0029] (III) Beneficial effects

[0030] The present invention provides an ultra-low temperature double-sided adhesive and a manufacturing process thereof, which has the following beneficial effects:

[0031] The double-sided adhesive tape of the present invention improves the low-temperature resistance of the adhesive tape by arranging an integrally formed first composite layer, a base layer, and a second composite layer assembly, and by preparing a low-temperature pressure-sensitive adhesive with a core-shell structure. At the same time, the low-temperature pressure-sensitive adhesive is arranged in a pressure-sensitive adhesive shell to form an adhesive microcapsule, so that under low-temperature conditions, the pressure-sensitive adhesive breaks and flows out of the adhesive microcapsule, thereby compensating for the pressure-sensitive adhesive gap caused by the low temperature and improving the adhesion effect of the double-sided adhesive tape.

[0032] The low-temperature resistant double-sided adhesive prepared by the present invention adopts an integrally formed first composite layer, a base layer and a second composite layer, and the first composite layer and the second composite layer are filled with adhesive microcapsules, so that the adhesiveness is maintained in an environment below -80°C, the adhesive has good low-temperature resistance, and has broad application prospects. DETAILED DESCRIPTION

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0035] Example 1

[0036] An ultra-low temperature double-sided adhesive tape comprises a first release paper, a first adhesive layer, a first composite layer, a base layer, a second composite layer, a second adhesive layer and a second release paper, in sequence from the upper surface to the lower surface. The first adhesive layer and the second adhesive layer are both formed by coating and curing a pressure-sensitive adhesive. The thickness ratio of the first composite layer, the base layer and the second composite layer is 0.4-0.7:1:0.4-0.7. The composite layer is specifically a nanofiber layer, and the nanofiber is filled with adhesive microcapsules.

[0037] Furthermore, the pressure-sensitive adhesive is prepared from acrylic pressure-sensitive adhesive latex and filler in a mass ratio of 100:5.8-9.6.

[0038] Furthermore, the adhesive microcapsule includes a pressure-sensitive glue shell and low-temperature pressure-sensitive glue, and the low-temperature pressure-sensitive glue is arranged in the pressure-sensitive glue shell.

[0039] Furthermore, the low temperature pressure-sensitive adhesive is prepared from the following raw materials in parts by weight:

[0040] Core-shell structure acrylate oligomer 30-40%;

[0041] Active diluent 50-60%;

[0042] Active agent 0.5-1%;

[0043] Photoinitiator 1-10%;

[0044] Coupling agent 0.1-2%;

[0045] The core-shell structured acrylic oligomer is prepared from hard monomers, soft monomers and functional monomers by a multiple emulsion method.

[0046] Further, the core-shell structured acrylate oligomer:

[0047] S1, ultrasonically mixing the hard monomer, the soft monomer and the functional monomer with an emulsifier, an initiator and deionized water to obtain a core emulsion;

[0048] S2, ultrasonically mixing the hard monomer, the soft monomer and the functional monomer with an emulsifier and deionized water to obtain a shell emulsion;

[0049] S3, mixing the initiator, emulsifier and deionized water in a volume ratio of 1:4:5 to form a base liquid;

[0050] S4. Add a mixture of hard monomers, soft monomers and functional monomers to the base liquid, then drop the core emulsion, shell emulsion and initiator in sequence, increase the temperature, heat and ripen the system, then cool and filter to wash off the emulsifier and initiator, and finally evaporate to remove water to obtain a core-shell structured acrylate oligomer.

[0051] Furthermore, the preparation process of the adhesive microcapsule includes: dissolving and stirring the pressure-sensitive adhesive and the low-temperature pressure-sensitive adhesive to form an outer phase solution and an inner phase solution, forming a wrapping liquid through a microfluidic extrusion device, and solidifying the wrapping liquid to form an adhesive microcapsule.

[0052] It is understandable that the microfluidic extrusion device is a prior art and will not be described in detail here.

[0053] Furthermore, the first composite layer, the base layer and the second composite layer are integrally formed by electrospinning, and the fiber diameter of the first composite layer is 800-1000nm, the fiber diameter of the base layer is 400-600nm, and the fiber diameter of the second composite layer is 800-1000nm.

[0054] This embodiment also provides a process for manufacturing an ultra-low temperature double-sided adhesive tape, including:

[0055] Step 1: soaking the first composite layer, the base layer and the second composite layer assembly formed in one piece into a solution-like adhesive capsule;

[0056] Step 2: taking out the soaked assembly and drying it, applying pressure-sensitive adhesive on one side of the dried assembly and curing it to form a first adhesive layer;

[0057] Step 3: Cover the first adhesive layer with the first release paper;

[0058] Step 4: Apply pressure-sensitive adhesive on the other side of the assembly, solidify it to form a second adhesive layer, and cover the second release paper on the second adhesive layer to form a double-sided adhesive.

[0059] Example 2

[0060] Compared with Example 1, the thickness ratio of the first composite layer, the base layer and the second composite layer in Example 2 is 0.4:1:0.4.

[0061] Example 3

[0062] Compared with Example 1, the thickness ratio of the first composite layer, the base layer and the second composite layer in Example 2 is 0.6:1:0.6.

[0063] Comparative Example 1

[0064] An ultra-low temperature double-sided adhesive tape comprises a first release paper, a first adhesive layer, a first composite layer, a base layer, a second composite layer, a second adhesive layer and a second release paper, in sequence from the upper surface to the lower surface. The first adhesive layer and the second adhesive layer are both formed by coating and curing pressure-sensitive adhesive. The thickness ratio of the first composite layer, the base layer and the second composite layer is 0.4:1:0.4. The composite layer is specifically a nanofiber layer, and the nanofiber is filled with pressure-sensitive adhesive.

[0065] Furthermore, the pressure-sensitive adhesive is prepared from acrylic pressure-sensitive adhesive latex and filler in a mass ratio of 100:5.8-9.6.

[0066] Furthermore, the first composite layer, the base layer and the second composite layer are integrally formed by electrospinning, and the fiber diameter of the first composite layer is 800-1000nm, the fiber diameter of the base layer is 400-600nm, and the fiber diameter of the second composite layer is 800-1000nm.

[0067] This embodiment also provides a process for manufacturing an ultra-low temperature double-sided adhesive tape, including:

[0068] Step 1: soaking the first composite layer, the base layer and the second composite layer assembly formed in one piece into a solution of pressure-sensitive adhesive;

[0069] Step 2: taking out the soaked assembly and drying it, applying pressure-sensitive adhesive on one side of the dried assembly and curing it to form a first adhesive layer;

[0070] Step 3: Cover the first adhesive layer with the first release paper;

[0071] Step 4: Apply pressure-sensitive adhesive on the other side of the assembly, solidify it to form a second adhesive layer, and cover the second release paper on the second adhesive layer to form a double-sided adhesive.

[0072] Comparative Example 2

[0073] An ultra-low temperature double-sided adhesive tape comprises a first release paper, a first adhesive layer, a first composite layer, a base layer, a second composite layer, a second adhesive layer and a second release paper, in sequence from the upper surface to the lower surface. The first adhesive layer and the second adhesive layer are both formed by coating and curing pressure-sensitive adhesive. The thickness ratio of the first composite layer, the base layer and the second composite layer is 0.6:1:0.6. The composite layer is specifically a nanofiber layer, and the nanofiber is filled with pressure-sensitive adhesive.

[0074] Furthermore, the pressure-sensitive adhesive is prepared from acrylic pressure-sensitive adhesive latex and filler in a mass ratio of 100:5.8-9.6.

[0075] Furthermore, the first composite layer, the base layer and the second composite layer are integrally formed by electrospinning, and the fiber diameter of the first composite layer is 800-1000nm, the fiber diameter of the base layer is 400-600nm, and the fiber diameter of the second composite layer is 800-1000nm.

[0076] This embodiment also provides a process for manufacturing an ultra-low temperature double-sided adhesive tape, including:

[0077] Step 1: soaking the first composite layer, the base layer and the second composite layer assembly formed in one piece into a solution of pressure-sensitive adhesive;

[0078] Step 2: taking out the soaked assembly and drying it, applying pressure-sensitive adhesive on one side of the dried assembly and curing it to form a first adhesive layer;

[0079] Step 3: Cover the first adhesive layer with the first release paper;

[0080] Step 4: Apply pressure-sensitive adhesive on the other side of the assembly, solidify it to form a second adhesive layer, and cover the second release paper on the second adhesive layer to form a double-sided adhesive.

[0081] Comparative Example 3

[0082] Compared with Comparative Example 1, the ultra-low temperature double-sided adhesive of Comparative Example 2 is provided with a first release paper, a first adhesive layer, a base layer, a second adhesive layer and a second release paper in sequence from the upper surface to the lower surface, and the first adhesive layer and the second adhesive layer are both formed by coating and curing pressure-sensitive adhesive.

[0083] Furthermore, the pressure-sensitive adhesive is prepared from acrylic pressure-sensitive adhesive latex and filler in a mass ratio of 100:5.8-9.6.

[0084] This embodiment also provides a process for manufacturing an ultra-low temperature double-sided adhesive tape, including:

[0085] Step 1: soaking the first composite layer, the base layer and the second composite layer assembly formed in one piece into a solution of pressure-sensitive adhesive;

[0086] Step 2: taking out the soaked assembly and drying it, applying pressure-sensitive adhesive on one side of the dried assembly and curing it to form a first adhesive layer;

[0087] Step 3: Cover the first adhesive layer with the first release paper;

[0088] Step 4: Apply pressure-sensitive adhesive on the other side of the assembly, solidify it to form a second adhesive layer, and cover the second release paper on the second adhesive layer to form a double-sided adhesive.

[0089] Performance test: 180° peel strength test: refer to GB / T 2792-2014 standard, use peel strength tensile tester for testing, tensile strength is tested by universal testing machine, impact strength test: refer to GB / T 1043.1-2008 standard, the test results are as follows:

[0090] It can be seen from the above table that the ultra-low temperature double-sided adhesives prepared in Examples 2 and 3 of the present invention have good mechanical properties and low temperature resistance.

[0091] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-low temperature double-sided adhesive, characterized in that: From the upper surface to the lower surface, a first release paper, a first adhesive layer, a first composite layer, a base layer, a second composite layer, a second adhesive layer and a second release paper are arranged in sequence, the first adhesive layer and the second adhesive layer are formed by coating and curing pressure-sensitive adhesive, the thickness ratio of the first composite layer, the base layer and the second composite layer is 0.4~0.7:1:0.4~0.7, the composite layer is specifically a nanofiber layer, and the nanofiber is filled with binder microcapsules.

2. The ultra-low temperature double-sided adhesive according to claim 1, characterized in that: The pressure-sensitive adhesive is prepared from acrylic pressure-sensitive adhesive emulsion and filler in a mass ratio of 100:5.8-9.

6.

3. The ultra-low temperature double-sided adhesive according to claim 2, characterized in that: The adhesive microcapsule comprises a pressure-sensitive glue shell and low-temperature pressure-sensitive glue, and the low-temperature pressure-sensitive glue is arranged in the pressure-sensitive glue shell.

4. The ultra-low temperature double-sided adhesive and its manufacturing process according to claim 3, characterized in that: The low temperature pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: Core-shell structure acrylate oligomer 30-40%; Active diluent 50-60%; Active agent 0.5-1%; Photoinitiator 1-10%; Coupling agent 0.1-2%; The core-shell structured acrylic ester oligomer is prepared from a hard monomer, a soft monomer and a functional monomer through a multiple emulsion method.

5. The ultra-low temperature double-sided adhesive according to claim 4, characterized in that: The core-shell structured acrylate oligomer: S1, ultrasonically mixing the hard monomer, the soft monomer and the functional monomer with an emulsifier, an initiator and deionized water to obtain a core emulsion; S2, ultrasonically mixing the hard monomer, the soft monomer and the functional monomer with an emulsifier and deionized water to obtain a shell emulsion; S3, mixing the initiator, emulsifier and deionized water in a volume ratio of 1:4:5 to form a base liquid; S4, adding a mixture of hard monomers, soft monomers and functional monomers to the base liquid, and then dropping the core emulsion, shell emulsion and initiator in sequence, raising the temperature, heating and aging the system, cooling and filtering, and eluting the emulsifier and initiator, and finally rotary evaporating to remove water to obtain a core-shell structured acrylate oligomer.

6. The ultra-low temperature double-sided adhesive according to claim 3, characterized in that: The preparation process of the adhesive microcapsule includes: respectively dissolving and stirring the pressure-sensitive adhesive and the low-temperature pressure-sensitive adhesive to form an external phase solution and an internal phase solution, forming a wrapping liquid through a microfluid extrusion device, and solidifying the wrapping liquid to form an adhesive microcapsule.

7. The ultra-low temperature double-sided adhesive according to claim 1, characterized in that: The first composite layer, the base layer and the second composite layer are integrally formed by electrospinning, and the fiber diameter of the first composite layer is 800-1000nm, the fiber diameter of the base layer is 400-600nm, and the fiber diameter of the second composite layer is 800-1000nm.

8. A process for producing an ultra-low temperature double-sided adhesive tape, characterized in that: include: Step 1: soaking the first composite layer, the base layer and the second composite layer assembly formed in one piece into a solution-like adhesive capsule; Step 2: taking out the soaked assembly and drying it, applying pressure-sensitive adhesive on one side of the dried assembly and curing it to form a first adhesive layer; Step 3: Cover the first release paper on the first adhesive layer; Step 4: Apply pressure-sensitive adhesive on the other side of the assembly, solidify it to form a second adhesive layer, and cover the second release paper on the second adhesive layer to form a double-sided adhesive.

Images