CN115725256B - Detachable acrylate adhesive, preparation method thereof and detachable structural member - Google Patents

Detachable acrylate adhesive, preparation method thereof and detachable structural member Download PDF

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CN115725256B
CN115725256B CN202211447283.5A CN202211447283A CN115725256B CN 115725256 B CN115725256 B CN 115725256B CN 202211447283 A CN202211447283 A CN 202211447283A CN 115725256 B CN115725256 B CN 115725256B
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methacrylate
acrylate
bond
adhesive
component
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CN115725256A (en
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郑勰
吉明磊
宋丽媛
孙国斌
管升阳
陈翠萍
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Daosheng Tianhe Material Technology Shanghai Co ltd
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Daosheng Tianhe Material Technology Shanghai Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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Abstract

The invention provides a detachable structural member, which comprises a plurality of structural members, wherein adjacent structural members are bonded through an acrylic ester adhesive, and the acrylic ester adhesive is treated by a reducing solution to release the connection relationship between the adjacent structural members. The invention solves the problem that components are difficult to detach after being bonded by using an acrylic ester adhesive in the prior art. The invention also provides a detachable acrylate adhesive and a preparation method thereof.

Description

Detachable acrylate adhesive, preparation method thereof and detachable structural member
Technical Field
The invention relates to the technical field of acrylate adhesives, in particular to a detachable acrylate adhesive, a preparation method thereof and a detachable structural member.
Background
The acrylic ester adhesive is an adhesive type with unique performance and numerous varieties, products with various performances can be designed according to different raw material formulas of the acrylic ester adhesive, and the application relates to various fields in daily life, such as the fields of industry and agriculture, aerospace, automobiles, electronics, biomedical treatment and the like. In the industries of new energy automobiles, electronics and the like, the acrylate adhesive plays an important role in fixing, heat conduction, insulation and other special functions for some key components. In recent years, on the premise of higher and higher requirements of high environmental protection, low energy consumption and resource recycling in China, the recycling of acrylate adhesives and the disassembly and recycling of adhered components become an extremely important research direction.
The prior acrylate adhesive has been widely used for fixing batteries and electronic products in a power system of a new energy automobile, but the use amount of the acrylate adhesive is relatively small, the value of the bonded devices is often much higher than that of the acrylate adhesive, the bonding strength of the prior acrylate adhesive to the devices is higher after the bonding is finished, and when the devices are required to be dismantled, the crosslinked network structure in the acrylate adhesive cannot be broken through simple post-treatment, so that the bonding force between the devices cannot be effectively removed. The traditional method for disassembling the adhered components is to destroy the adhesive interface or adhesive layer by adding thermal expansion microspheres through mechanical force or adhesive layer, so as to disassemble the adhered components, but the adhered components are easily destroyed or acrylate adhesive remains on the components. Particularly, the disassembly and recycling of adhered components are more important for the fields of complex production process, high production cost and reusability after disassembly and cleaning. The components are difficult to disassemble and recycle after being bonded by using an acrylic ester adhesive.
Therefore, there is a need to develop a removable acrylate adhesive, a method for preparing the same, and a removable structure to avoid the above-mentioned problems in the prior art.
Disclosure of Invention
The invention aims to provide a detachable acrylate adhesive, a preparation method thereof and a detachable structural member, which solve the problem that components are difficult to detach after being bonded by the acrylate adhesive in the prior art.
In order to achieve the above purpose, the invention provides a detachable structural member, which comprises a plurality of structural members, wherein adjacent structural members are bonded through an acrylic ester adhesive, and the acrylic ester adhesive is treated by a reducing solution to release the connection relationship between the adjacent structural members.
The detachable structural member has the beneficial effects that: the adjacent structural members are bonded through an acrylic ester adhesive, and the acrylic ester adhesive is treated by a reducing solution to release the connection relationship between the adjacent structural members. Compared with the prior art, the invention has the advantages that maintenance and disassembly are difficult for the acrylate adhesive in the existing pack structural member, a great deal of time cost and labor cost are consumed, and unnecessary material loss is increased. The invention provides a structural member bonded by an acrylic ester adhesive, which can easily realize the purpose of detachability after the acrylic ester adhesive is treated by a reducing solution. The invention solves the problem that components are difficult to detach after being bonded by using an acrylic ester adhesive in the prior art.
Optionally, the bonding strength of the acrylate adhesive between adjacent structural members after being treated by the reducing solution is 0MPa, the thickness of the acrylate adhesive between adjacent structural members is less than or equal to 5 mm, and the structural members comprise battery PACK structural members.
Optionally, the acrylate adhesive contains a cross-linking agent, and acrylate monomers are connected through weak coupling bonds to form the cross-linking agent; after the acrylate adhesive is treated by the reducing solution, the weak coupling bond is broken or recombined, so that the bonding strength of the acrylate adhesive is reduced by 99% -100% to realize the detachability between the adjacent structural members.
Optionally, the step of reducing solution treatment includes: and (3) treating the acrylate adhesive between the adjacent structural members by using the reducing solution, wherein the reducing solution comprises a reducing substance and an organic solvent, the concentration of the reducing solution is 0.01-0.5 mol/L, and the adhesive strength between the adjacent structural members is 1-4 MPa when the adjacent structural members are adhered by the acrylate adhesive.
Optionally, the reducing substance is at least one selected from 2-mercaptoethanol, thioglycollic acid, dithiothreitol, dithioerythritol, reduced glutathione, n-tributylphosphine, tris (2-carboxyethyl) phosphine hydrochloride, sodium borohydride and sodium persulfate.
Optionally, the organic solvent is at least one selected from dichloromethane, chloroform, ethyl acetate, toluene, xylene, tetrahydrofuran, N-dimethylformamide and acetone.
Alternatively, the weak coupling bond includes any one of an ester bond, a sulfinic acid bond, a perfluorocarbonic acid structure, a phosphoric acid ester bond, a disulfide bond, a ketal structure, an imine structure, an alkoxyamine, an aminal, an amine-blocking bond, a tertiary carbamic acid, an acylhydrazone structure, a orthoester acid, an acetal structure, an orthocarbonate ester bond, a peroxy bond, an orthocarbonate bond, a diels alder structure, and a boron ester bond.
Another object of the present invention is to provide an acrylate adhesive for application to the detachable structural member, the acrylate adhesive comprising a component a and a component B;
the component A comprises a first acrylic resin, core-shell particles and peroxide, the component B comprises a second acrylic resin, core-shell particles, a cross-linking agent and a catalyst, and acrylic monomers are connected through weak coupling bonds to form the cross-linking agent;
the content of the first acrylic resin is 5-15 parts by weight, the content of the core-shell particles is 1-5 parts by weight, and the content of the peroxide is 0.01-1.3 parts by weight;
the weight percentage of the second acrylic resin is 5-15 parts, the weight percentage of the core-shell particles is 1-5 parts, the weight percentage of the cross-linking agent is 0.5-10 parts, and the weight percentage of the catalyst is 0.01-0.5 parts;
the mass ratio of the component A to the component B is 1 (0.5-2.0).
The acrylic ester adhesive has the beneficial effects that: the acrylate adhesive provided by the invention combines other components by adopting weak coupling bonds, and has strong bonding strength in the application of structural members, in particular to PACK structural members; when the acrylate adhesive for bonding structural members is treated by the reducing solution, the weak coupling bond is broken or recombined, so that the structure and the performance of the acrylate adhesive are changed, the acrylate adhesive is dissolved in the reducing solution, and finally, the structural members are automatically separated from each other, and no residual acrylate adhesive exists on the structural members. Therefore, the disassembly, assembly, replacement, repair and recycling of the structural member, particularly the power battery device, are convenient for the large belt, and the process is simple and easy to control, thereby being beneficial to realizing industrial continuous production. The detachable acrylate adhesive has wide application prospect in the field of structural member bonding, in particular to the field of power battery device bonding.
Optionally, the first acrylate resin includes at least one of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, methoxyethyl methacrylate, lauric methacrylate, glycidyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, methyl methacrylate, and trifluoroethyl methacrylate.
Optionally, the second acrylate resin includes at least one of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, methoxyethyl methacrylate, lauric methacrylate, glycidyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, methyl methacrylate, and trifluoroethyl methacrylate.
Alternatively, the weak coupling bond includes any one of an ester bond, a sulfinic acid bond, a perfluorocarbonic acid structure, a phosphoric acid ester bond, a disulfide bond, a ketal structure, an imine structure, an alkoxyamine, an aminal, an amine-blocking bond, a tertiary carbamic acid, an acylhydrazone structure, a orthoester acid, an acetal structure, an orthocarbonate ester bond, a peroxy bond, an orthocarbonate bond, a diels alder structure, and a boron ester bond.
Further alternatively, the weak coupling bond includes any one of a disulfide bond, a ketal structure, and an imine structure.
The invention also aims to provide a preparation method of the acrylic adhesive, wherein the acrylic adhesive is obtained after the component A and the component B are mixed and reacted for 0.5-2 hours at normal temperature, and the mass ratio of the component A to the component B is 1 (0.5-2.0).
The preparation method of the acrylic ester adhesive has the beneficial effects that: the preparation method is simple, and is suitable for mass production, and the obtained acrylate adhesive is easy to detach.
The invention has the beneficial effects that:
the non-destructive disassembly of the adhered structural component is beneficial to recycling of the structural component, in particular to the recycling of the structural component which has complex production process, high production cost and reusability after disassembly and cleaning, such as the recycling of semiconductors and chips, in particular to the recycling of the pack structural component of the power battery; the organic solvent in the reducing solution used in the disassembly process is low in toxicity, even the organic solvent is nontoxic, the environmental pollution is small, the recovery is easy, and the recovery of the acrylic resin can be realized in the recovery process of the organic solvent; the concentration of the reducing substances used in the disassembly process is low, the use amount is low, the disassembly efficiency is high, and the recycling cost of the bonded component can be reduced to a great extent; the adhesive can be applied to most acrylic adhesives, and can be detached for all structural members.
Drawings
FIG. 1 is a hydrogen spectrum of a cross-linking agent according to an embodiment of the present invention;
FIG. 2 is an infrared spectrum of a cross-linking agent according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and the like means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof without precluding other elements or items.
The embodiment of the invention provides a detachable structural member, which comprises a plurality of structural members, wherein adjacent structural members are bonded through an acrylic ester adhesive, and the acrylic ester adhesive is treated by a reducing solution to release the connection relationship between the adjacent structural members.
Specifically, adjacent structural members are bonded through an acrylic ester adhesive, and the acrylic ester adhesive is treated by a reducing solution to release the connection relationship between the adjacent structural members. Compared with the prior art, the invention has the advantages that maintenance and disassembly are difficult for the acrylate adhesive in the existing pack structural member, a great deal of time cost and labor cost are consumed, and unnecessary material loss is increased. The invention provides a structural member bonded by an acrylic ester adhesive, which can easily realize the purpose of detachability after the acrylic ester adhesive is treated by a reducing solution. The invention solves the problem that components are difficult to detach after being bonded by using an acrylic ester adhesive in the prior art.
In some embodiments of the invention, the adhesive strength of the acrylate adhesive between adjacent structural members, including battery PACK structural members, after the acrylate adhesive between adjacent structural members is treated with a reducing solution is 0MPa, and the thickness of the acrylate adhesive between adjacent structural members is less than or equal to 5 millimeters. In some specific embodiments, the thickness of the acrylate adhesive between adjacent structural members is any one of 1 mm, 2mm,3 mm, 4 mm, and 5 mm.
In some embodiments of the present invention, the acrylate adhesive comprises a cross-linking agent, wherein acrylate monomers are connected by weak coupling bonds to form the cross-linking agent; after the acrylate adhesive is treated by the reducing solution, the weak coupling bond is broken or recombined, so that the bonding strength of the acrylate adhesive is reduced by 99% -100% to realize the detachability between the adjacent structural members.
In some embodiments of the invention, the step of reducing solution treatment comprises: and (3) treating the acrylate adhesive between the adjacent structural members by using the reducing solution, wherein the reducing solution comprises a reducing substance and an organic solvent, the concentration of the reducing solution is 0.01-0.5 mol/L, and the adhesive strength between the adjacent structural members is 1-4 MPa when the adjacent structural members are adhered by the acrylate adhesive. In some specific embodiments, the concentration of the reducing solution is any one of 0.01mol/L, 0.05mol/L, 0.1mol/L, 0.15mol/L, 0.2mol/L, 0.25mol/L, 0.3mol/L, 0.35mol/L, 0.4mol/L, 0.45mol/L and 0.5mol/L, and the bonding strength between adjacent structural members when bonded by the acrylate adhesive is any one of 1MPa, 2MPa, 3MPa and 4MPa.
In some embodiments of the present invention, the reducing substance is selected from at least one of 2-mercaptoethanol (2-hydroxy-1-ethane, ME), thioglycolic acid (Mercaptoacetic acid, TGA), dithiothreitol (1, 4-dithiothreitol, DTT), dithioerythritol (DTE), reduced Glutathione (GSH), n-tributylphosphine (tributylphosphine), tris (2-carboxyethyl) phosphate (Tris (2-carboxyyl) phosphine Hydrochloride, TCEP), sodium borohydride, and sodium persulfate. In some specific embodiments, the reducing substance is selected from at least one of n-tributylphosphine, sodium borohydride, and sodium persulfate. Some specific examples, the dithiothreitolEnglish is abbreviated as DTT, english of the reduced type glutathione is abbreviated as GSH, and English of the n-tributylphosphine is abbreviated as Bu 3 P, the english abbreviation of said tris (2-carboxyethyl) phosphine hydrochloride is TCEP.
In some embodiments of the invention, the organic solvent is selected from at least one of dichloromethane, chloroform, ethyl acetate, toluene, xylene, tetrahydrofuran, N-dimethylformamide, and acetone. In some specific embodiments, the organic solvent is selected from at least one of ethyl acetate and N, N-dimethylformamide. In some specific embodiments, the english language of N, N-dimethylformamide is abbreviated as DMF.
In some embodiments of the invention, the weak coupling bond includes any one of an ester bond, a sulfinic acid bond, a perfluorocarbonic acid structure, a phosphoric acid ester bond, a disulfide bond, a ketal structure, an imine structure, an alkoxyamine, an aminal, an hindered amine bond, a tertiary carbamic acid, an acylhydrazone structure, a orthoester acid, an acetal structure, an orthocarbonate bond, a peroxy bond, an orthocarbonate bond, a diels alder structure, and a boron ester bond.
In some embodiments of the invention, the weakly coupled bond includes any one of a disulfide bond, a ketal structure, and an imine structure.
In the embodiment of the invention, an acrylic ester adhesive is provided, wherein the acrylic ester adhesive is applied to the detachable structural member and comprises a component A and a component B;
the component A comprises a first acrylic resin, core-shell particles and peroxide, the component B comprises a second acrylic resin, core-shell particles, a cross-linking agent and a catalyst, and acrylic monomers are connected through weak coupling bonds to form the cross-linking agent;
the content of the first acrylic resin is 5-15 parts by weight, the content of the core-shell particles is 1-5 parts by weight, and the content of the peroxide is 0.01-1.3 parts by weight;
the weight percentage of the second acrylic resin is 5-15 parts, the weight percentage of the core-shell particles is 1-5 parts, the weight percentage of the cross-linking agent is 0.5-10 parts, and the weight percentage of the catalyst is 0.01-0.5 parts;
the mass ratio of the component A to the component B is 1 (0.5-2.0).
Specifically, the acrylate adhesive provided by the invention adopts weak coupling bond to combine with other components, and has strong bonding strength in the application of structural members, in particular to PACK structural members; when the acrylate adhesive for bonding structural members is treated by the reducing solution, the weak coupling bond is broken or recombined, so that the structure and the performance of the acrylate adhesive are changed, the acrylate adhesive is dissolved in the reducing solution, and finally, the structural members are automatically separated from each other, and no residual acrylate adhesive exists on the structural members. Therefore, the disassembly, assembly, replacement, repair and recycling of the structural member, particularly the power battery device, are convenient for the large belt, and the process is simple and easy to control, thereby being beneficial to realizing industrial continuous production. The detachable acrylate adhesive has wide application prospect in the field of structural member bonding, in particular to the field of power battery device bonding.
In some embodiments of the present invention, the first acrylate resin may be present in an amount of 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, and 15 parts by weight, the core-shell particles may be present in an amount of any one of 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, and 5 parts by weight, and the peroxide may be present in an amount of any one of 0.01 part by weight, 0.05 part by weight, 0.1 part by weight, 0.3 part by weight, 0.6 part by weight, 0.7 part by weight, 0.8 part by weight, 0.9 part by weight, 1.0 part by weight, 1.1 part by weight, 1.2 parts by weight, and 1.3 parts by weight, based on the weight of the a part by weight of the component.
In still other specific embodiments of the present invention, the second acrylate resin may be present in an amount of 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, and 15 parts by weight, the core-shell particle may be present in an amount of 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, and 5 parts by weight, the crosslinking agent may be present in an amount of 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, and 10 parts by weight, and the catalyst may be present in an amount of 0.01 part by weight, 0.05 part by weight, 0.1 part by weight, 0.2 part by weight, 0.3 part by weight, 0.4 part by weight, and 0.5 part by weight, based on the weight of the component B.
In other embodiments of the present invention, the mass ratio of the a component to the B component is any one of 1:0.5, 1:1, 1:1.5, and 1:2.
In some embodiments of the present invention, the first acrylate resin includes at least one of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, methoxyethyl methacrylate, lauric methacrylate, glycidyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, methyl methacrylate, and trifluoroethyl methacrylate.
In some embodiments of the present invention, the second acrylate resin includes at least one of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, methoxyethyl methacrylate, lauric methacrylate, glycidyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, methyl methacrylate, and trifluoroethyl methacrylate.
In some embodiments of the invention, the weak coupling bond includes any one of an ester bond, a sulfinic acid bond, a perfluorocarbonic acid structure, a phosphoric acid ester bond, a disulfide bond, a ketal structure, an imine structure, an alkoxyamine, an aminal, an hindered amine bond, a tertiary carbamic acid, an acylhydrazone structure, a orthoester acid, an acetal structure, an orthocarbonate bond, a peroxy bond, an orthocarbonate bond, a diels alder structure, and a boron ester bond. In some specific embodiments, the weak coupling bond includes any one of a disulfide bond, a ketal structure, and an imine structure. In some more specific embodiments, the weak coupling bond is a disulfide bond.
In some embodiments of the present invention, the core-shell particles comprise MZ200, MX125, EPS-125 manufactured by Shenzhen, inc. In some specific embodiments, the core-shell particles comprise MZ200.
In some embodiments of the invention, the peroxide comprises dibenzoyl peroxide, cumyl hydroperoxide, dilauroyl peroxide, t-butyl hydroperoxide, t-butyl peroxyacetate, dicyclohexyl peroxydicarbonate, t-butyl peroxypivalate, amyl peroxypivalate, diisopropyl peroxydicarbonate. In some specific embodiments, the peroxide comprises dibenzoyl peroxide, abbreviated as BPO.
In some embodiments of the invention, the catalyst comprises iron sulfite, sodium sulfite, triethylamine, N-dimethylaniline, N-dimethyl-p-toluidine. In some specific embodiments, the catalyst comprises N, N-dimethyl-p-toluidine, abbreviated as DMT.
In some embodiments of the invention, the step of preparing the crosslinker comprises: adding methacrylic acid, a weak coupling bond compound and a polymerization inhibitor into a normal hexane solvent for reaction at 80 ℃, and then sequentially carrying out alkali washing treatment, water washing treatment, solvent removal treatment and water removal treatment to obtain the cross-linking agent, wherein the molar ratio of the methacrylic acid to the weak coupling bond compound is (2-3): 1.
In some embodiments of the invention, the step of preparing the crosslinker comprises: adding a weak coupling bond compound and an acid binding agent into a dichloromethane solvent, stirring for 1 hour in an ice-water bath, slowly adding a methacryloyl chloride compound, reacting for 24 hours at room temperature, and then sequentially carrying out acid washing treatment, alkali washing treatment, water washing treatment, drying treatment and desolventizing treatment to obtain the cross-linking agent, wherein the molar ratio of the methacryloyl chloride compound to the acid binding agent is 1 (1-1.5).
The embodiment of the invention provides a preparation method of an acrylic ester adhesive, which is characterized in that an acrylic ester adhesive is obtained after a component A and a component B are mixed and reacted for 0.5-2 hours at normal temperature, and the mass ratio of the component A to the component B is 1 (0.5-2.0).
Specifically, the preparation method is simple, and is suitable for mass production, and the obtained acrylate adhesive is easy to detach.
Example 1
FIG. 1 is a hydrogen spectrum of a cross-linking agent according to an embodiment of the present invention; FIG. 2 is an infrared spectrum of a cross-linking agent according to an embodiment of the present invention.
The first preparation method of the cross-linking agent comprises the following steps: 12.9g of methacrylic acid, 9.24g of bishydroxyethyl disulfide and 0.1g of hydroquinone are added into a round-bottomed flask filled with 180ml of normal hexane solvent, the flask is connected with a condensation water diversion device, the reaction reflux is carried out at 80 ℃ until no water is generated in the water diversion device, and the light yellow oily diethylene glycol dimethacrylate disulfide is obtained after the alkali washing treatment, the water washing treatment, the desolventizing treatment and the water removal treatment in sequence, and the yield is 67.5%. Namely, the diethylene glycol dimethacrylate disulfide prepared by the method is marked as a first crosslinking agent.
A second preparation method of the cross-linking agent: 10.02g of bishydroxyethyl disulfide and 11.3g of pyridine are added into a round-bottomed flask filled with 250ml of dichloromethane solvent, stirred in an ice-water bath for 1 hour, 14.95g of methacryloyl chloride is slowly added dropwise through a separating funnel at 0 ℃ and reacted at room temperature for 24 hours after the addition is completed, then washed once with 200ml of 1mol/L HCl solution and 1mol/L NaOH solution in sequence, washed twice with deionized water, and finally dried over anhydrous MgSO 4 Drying and spin evaporation of the solvent gave diethylene glycol dimethacrylate as a pale yellow oil in 60.2% yield. Namely, the method prepares the disulfide diethylene glycol dimethacrylateAnd is denoted as a second crosslinking agent.
The hydrogen spectrum of diethylene glycol dimethacrylate disulfide refers to fig. 1, in which a (σ=6.13 ppm and σ=5.59 ppm) is the peak (two independent singlet) of double bond H, b (σ=4.42 ppm) is the methylene hydrogen with oxygen (triplet), c (σ=1.95 ppm) is the methyl hydrogen peak (singlet), and d (σ=2.98 ppm) is the methylene hydrogen peak with sulfur (triplet). The infrared spectrum of diethylene glycol dimethacrylate disulfide is shown in FIG. 2, which is 1636cm -1 、1402cm -1 、1011cm -1 、940cm -1 Characteristic peak of C=C double bond, 1714cm -1 、1150cm -1 Is a characteristic absorption peak of the ester group.
Example 2
The preparation method of the acrylic ester adhesive comprises the following steps: according to the compositions and components in Table 1, the A component and the B component were mixed at room temperature to obtain an acrylic adhesive, which was designated as samples 1 to 3, respectively. Mixing and reacting the sample 1 for 0.5h, wherein the mass ratio of the component A to the component B of the sample 1 is 1:0.8; mixing and reacting the sample 2 for 1.0h, wherein the mass ratio of the component A to the component B of the sample 2 is 1:1; sample 3 was mixed and reacted for 1.5 hours, and the mass ratio of the A component to the B component of sample 3 was 1:1.6.
TABLE 1
Comparative example
And (3) a component A: 10 parts of methyl methacrylate, 3.3 parts of MZ200 and 0.9 part of BPO; and the component B comprises the following components: 10 parts of methyl methacrylate, 3.3 parts of MZ200 and 0.2 part of DMT; and mixing the component A and the component B according to the mass ratio of 1:1 for reaction for 30min to obtain the acrylic adhesive, which is marked as a comparative sample 1.
And (3) a component A: 10 parts of methyl methacrylate, 3.3 parts of MZ200 and 0.9 part of BPO; and the component B comprises the following components: 10 parts of methyl methacrylate, 3.3 parts of MZ200, 2 parts of polyethylene glycol 400 dimethacrylate and 0.2 part of DMT; and mixing the component A and the component B according to the mass ratio of 1:1 for reaction for 30min to obtain the acrylic adhesive, which is marked as a comparative sample 2.
Dissolution performance test: and respectively placing the samples 1-3 and the comparative samples 1-2 into 6mL of an existing 0.05mol/L reducing solution, sealing, and observing the dissolution condition of the resin every 1h at room temperature, wherein the reducing solution consists of N-tributylphosphine and N, N-dimethylformamide. Dissolution performance test results: samples 1 to 3 were completely dissolved after 24 hours, and no dissolution phenomenon was found in comparative samples 1 to 2 even if the time was prolonged.
And uniformly coating samples 1-3 and comparative samples 1-2 on the surfaces of 1.25 x 2.5cm aluminum sheets respectively, pressing another aluminum sheet with the same size on the aluminum sheet to bond, obtaining an aluminum sheet structural member after the thickness of an adhesive layer is 0.2mm and 30min, immersing the aluminum sheet structural member in 100mL of an existing reducing solution with the concentration of 0.05mol/L, and observing the bonding condition of the aluminum sheet every 1 hour at room temperature. After soaking for 4 hours, the bonded aluminum sheets of the samples 1-3 are automatically separated, and no residual sample exists on the surfaces of the aluminum sheets; while the aluminum flakes bonded to comparative samples 1-2 did not change significantly. Table 2 shows the tensile shear strength of the aluminum sheets bonded by samples 1 to 3 and comparative samples 1 to 2 before and after immersion in a reducing solution having a concentration of 0.05mol/L, and the standard for tensile shear strength reference was ISO 4587-2003. The reducing solution consists of N-tributylphosphine and N, N-dimethylformamide.
TABLE 2
Sample 1 Sample 2 Sample 3 Comparative sample 1 Comparative sample2
0 hours 2.45MPa 2.76MPa 3.29MPa 2.38MPa 2.94MPa
4 hours 0 0 0 2.29MPa 2.72MPa
As can be seen from the data in table 2, the addition of the cross-linking agent containing the weak coupling bond compound to the acrylate adhesive allows the acrylate adhesive to change the structure and properties of the acrylate adhesive after being immersed in the reducing solution, thereby allowing the acrylate adhesive to be easily removed without leaving adhesive on the structural member.
The foregoing examples are illustrative only and serve to explain some features of the method of the invention. The appended claims are intended to claim the broadest possible scope and the embodiments presented herein are merely illustrative of selected implementations based on combinations of all possible embodiments. It is, therefore, not the intention of the applicant that the appended claims be limited by the choice of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within which variations in these ranges should also be construed as being covered by the appended claims where possible.

Claims (9)

1. The detachable structural member is characterized by comprising a plurality of structural members, wherein adjacent structural members are bonded through an acrylic ester adhesive, the acrylic ester adhesive is treated by a reducing solution to release the connection relationship between the adjacent structural members, the acrylic ester adhesive contains a cross-linking agent, and acrylic ester monomers are connected through weak coupling bonds to form the cross-linking agent; after the acrylate adhesive is treated by a reducing solution, the weak coupling bond is broken or recombined, so that the bonding strength of the acrylate adhesive is reduced by 99% -100% to realize the detachability between adjacent structural members, and the step of treating by the reducing solution comprises the following steps: the acrylate adhesive between adjacent structural members is treated by using a reducing solution, the reducing solution comprises a reducing substance and an organic solvent, the concentration of the reducing solution is 0.01-0.5 mol/L, the bonding strength of the adjacent structural members when the structural members are bonded by the acrylate adhesive is 1-4 MPa, the reducing substance is at least one selected from 2-mercaptoethanol, thioglycollic acid, dithiothreitol, dithioerythritol, reduced glutathione, N-tributylphosphine, tris (2-carboxyethyl) phosphine hydrochloride, sodium borohydride and sodium persulfate, and the organic solvent is at least one selected from dichloromethane, chloroform, ethyl acetate, toluene, xylene, tetrahydrofuran, N-dimethylformamide and acetone.
2. The removable structure of claim 1, wherein the adhesive strength of the acrylate adhesive between adjacent structures after the reductive solution treatment is 0MPa, and the thickness of the acrylate adhesive between adjacent structures is less than or equal to 5 millimeters, the structure comprising a battery PACK structure.
3. The detachable structural member of claim 1, wherein the weak coupling bond comprises any one of an ester bond, a sulfinic acid bond, a perfluorocarbonic acid structure, a phosphoester bond, a disulfide bond, a ketal structure, an imine structure, an alkoxyamine, an aminal, an hindered amine bond, a tertiary carbamic acid, an acylhydrazone structure, a orthoester acid, an acetal structure, an orthocarbonate bond, a peroxy bond, an orthocarbonate bond, a diels alder structure, and a boron bond.
4. An acrylic adhesive, characterized in that it is applied to the detachable structural member according to any one of claims 1 to 3, and comprises a component a and a component B;
the component A comprises a first acrylic resin, core-shell particles and peroxide, the component B comprises a second acrylic resin, core-shell particles, a cross-linking agent and a catalyst, and acrylic monomers are connected through weak coupling bonds to form the cross-linking agent;
the weight percentage of the component A is calculated, the content of the first acrylic resin is 5-15 parts by weight, the content of the core-shell particles is 1-5 parts by weight, and the content of the peroxide is 0.01-1.3 parts by weight;
the weight percentage of the second acrylic resin is 5-15 parts, the weight percentage of the core-shell particles is 1-5 parts, the weight percentage of the cross-linking agent is 0.5-10 parts, and the weight percentage of the catalyst is 0.01-0.5 parts;
the mass ratio of the component A to the component B is 1 (0.5-2.0).
5. The acrylate adhesive of claim 4 wherein the first acrylate resin comprises at least one of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, methoxyethyl methacrylate, laurate methacrylate, glycidyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and trifluoroethyl methacrylate.
6. The acrylate adhesive of claim 4 wherein the second acrylate resin comprises at least one of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, methoxyethyl methacrylate, laurate methacrylate, glycidyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and trifluoroethyl methacrylate.
7. The acrylate adhesive of claim 4 wherein the weak coupling bond comprises any one of an ester bond, a sulfinic acid bond, a perfluorocarbonic acid structure, a phosphoester bond, a disulfide bond, a ketal structure, an imine structure, an alkoxyamine, an aminal, an amine blocking bond, a tertiary carbamate, an acylhydrazone structure, a orthoester acid, an acetal structure, an orthocarbonate bond, a peroxy bond, an orthocarbonate bond, a diels alder structure, and a boron bond.
8. The acrylate adhesive of claim 7 wherein said weak coupling bond comprises any one of a disulfide bond, a ketal structure, and an imine structure.
9. The method for preparing the acrylate adhesive according to any one of claims 4 to 8, wherein the acrylate adhesive is obtained by mixing and reacting the component A and the component B for 0.5 to 2 hours at normal temperature, and the mass ratio of the component A to the component B is 1 (0.5 to 2.0).
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CN114752342A (en) * 2021-05-19 2022-07-15 道生天合材料科技(上海)股份有限公司 Acrylate adhesive and preparation method thereof

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CN103797082A (en) * 2011-09-14 2014-05-14 电气化学工业株式会社 Composition and method for temporarily fixing member using same
WO2015093517A1 (en) * 2013-12-17 2015-06-25 住友化学株式会社 Aqueous emulsion
CN111363481A (en) * 2019-12-23 2020-07-03 烟台信友新材料有限公司 Low-shrinkage, low-modulus and heat-resistant UV-heat dual-curing adhesive and preparation method thereof
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