Structural anaerobic adhesive for bonding high-temperature-resistant magnetic steel and preparation method of structural anaerobic adhesive

Abstract

The invention relates to the technical field of anaerobic adhesives, and particularly discloses a structural anaerobic adhesive for bonding high-temperature-resistant magnetic steel and a preparation method thereof.The anaerobic adhesive is prepared from, by mass, 60%-80% of urethane acrylate, 10%-20% of methacrylate, 0.01%-1% of polymerization inhibitor, 0.1%-5% of metal ion chelating agent, 0.1%-5% of accelerant and 0.1%-5% of auxiliary accelerant. 1-15% of a bismaleimide heat-resistant auxiliary agent, 1-10% of a core-shell structure impact modifier, and 1-5% of an initiator. By adding the heat-resistant additive and the impact modifier, the temperature resistance and toughness of the anaerobic adhesive are improved, and the anaerobic adhesive is especially suitable for magnetic steel bonding in a high-temperature environment.

Description

Technical Field

[0001] The invention belongs to the technical field of anaerobic adhesives, and specifically relates to a structural anaerobic adhesive for bonding high-temperature resistant magnetic steel and a preparation method thereof. Background Art

[0002] The application of structural anaerobic adhesive has significant advantages in the bonding and fixing of magnetic steel. It can fill the tiny gap between the magnetic steel and the mounting base, enhancing the firmness of the assembly. After curing, it can form a strong bonding force and have a certain toughness, which can effectively prevent the magnetic steel from loosening or falling off during use. In addition, because it also has good temperature resistance and chemical stability, it can maintain long-term effective bonding in harsh working environments.

[0003] At present, existing structural anaerobic adhesives often have problems such as performance degradation and weakened bonding strength under high temperature (>120°C), and cannot meet the bonding requirements of magnetic steel in high temperature working environment. Patent CN111704887A proposes a thixotropic anaerobic magnetic steel adhesive with high toughness but does not involve the temperature resistance of anaerobic adhesives.

[0004] Patent CN101705071A uses bismaleimide as a heat-resistant auxiliary agent to prepare a high-temperature resistant structural anaerobic adhesive, but it does not provide further testing and description on the toughness of the adhesive.

[0005] Patent CN103342966A enhances the adhesion and high temperature resistance of the system by adding appropriate amounts of high-functionality oligomers and monomers, but the adhesive formula containing high-functionality oligomers is relatively complex.

[0006] Therefore, it is necessary to develop a structural bonding anaerobic adhesive that is simple to prepare and has good high temperature resistance and toughness to meet the working conditions of high temperature environments for magnetic steel bonding. Summary of the invention

[0007] The object of the present invention is to provide a structural anaerobic adhesive for bonding high-temperature resistant magnetic steel and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A structural anaerobic adhesive for high temperature resistant magnetic steel bonding, the structural anaerobic adhesive is composed of the following components in percentage by mass:

[0010]

[0011] Preferably, the polyurethane acrylate monomer is selected from one or a mixture of difunctional aliphatic or aromatic polyurethane acrylates.

[0012] Preferably, the methacrylate monomer is selected from one or a mixture of polyethylene glycol 400 dimethacrylate, triethylene glycol dimethacrylate, ethoxylated bisphenol A dimethacrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate, isobornyl methacrylate, methyltetrahydrofuran acrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate.

[0013] Preferably, the polymerization inhibitor is selected from at least one of p-tert-butylphenol, hydroquinone, p-benzoquinone, naphthoquinone, anthraquinone and p-methoxyphenol.

[0014] Preferably, the metal ion chelating agent is selected from disodium ethylenediaminetetraacetate or tetrasodium ethylenediaminetetraacetate.

[0015] Preferably, the accelerator is selected from at least one of acetophenylhydrazine, tetramethylthiourea, triethylamine, N,N-dimethyl-p-toluidine, and N,N-diethyl-p-toluidine, and the auxiliary accelerator is selected from at least one of o-benzenesulfonimide, phthalimide, ascorbic acid, maleic acid, and acrylic acid.

[0016] Preferably, the bismaleimide heat-resistant auxiliary agent is selected from one of N,N-phenylene bismaleimide and diphenylmethane bismaleimide.

[0017] Preferably, the core-shell structure impact modifier is methyl methacrylate-butadiene-styrene terpolymer (MBS), and its model is one of Rohm and Haas EXL-2620 or EXL-2691, LG EM500, Japan Kanebuchi B-625 or M-711.

[0018] Preferably, the initiator is selected from one of cumene hydroperoxide and tert-butyl hydroperoxide.

[0019] A method for preparing a structural anaerobic adhesive for high temperature resistant magnetic steel bonding:

[0020] The following steps are involved:

[0021] (1) Add polyurethane acrylate and methacrylate monomers, stabilizer and metal ion chelating agent into a reaction kettle, and stir and mix at 50° C. for 60 minutes.

[0022] (2) Add bismaleimide, core-shell structure anti-impact modifier, accelerator and co-accelerator in sequence under stirring and disperse evenly at 50-60°C.

[0023] (3) After cooling to room temperature, add peroxide initiator and stir for 120 minutes to obtain the finished product.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention adopts bismaleimide as a heat-resistant modifier, which greatly improves the heat resistance of the anaerobic adhesive. The core-shell structure impact modifier is easily available in the market, which effectively improves the toughness and impact resistance of the anaerobic adhesive. The improvement of the above performance effectively improves the performance degradation and weakened bonding strength problems of magnetic steel bonding under high temperature. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1:

[0028]

[0029] Preparation method

[0030] 1. During the preparation, difunctional aliphatic polyurethane acrylate, ethoxylated bisphenol A dimethacrylate and hydroxypropyl methacrylate, hydroquinone and disodium ethylenediaminetetraacetate were added into a reaction kettle and stirred and mixed at 50°C for 60 minutes.

[0031] 2. Then add diphenylmethane bismaleimide, EXL-2620, N,N-dimethyl-p-toluidine and o-benzenesulfonimide in sequence under stirring and disperse evenly at 50-60°C.

[0032] 3. Cool to room temperature, add cumene hydroperoxide and stir for 120 minutes to obtain the finished product.

[0033] Embodiment 2:

[0034]

[0035] Preparation method

[0036] 1. During the preparation, add difunctional aromatic polyurethane acrylate, polyethylene glycol 400 dimethacrylate and hydroxyethyl methacrylate, naphthoquinone and tetrasodium ethylenediaminetetraacetate into a reaction kettle and stir and mix at 50°C for 60 minutes.

[0037] 2. Then add N,N-phenylene bismaleimide, EM500, acetylphenylhydrazine and ascorbic acid in sequence under stirring and disperse evenly at 50-60°C.

[0038] 3. Cool to room temperature, add tert-butyl hydroperoxide and stir for 120 minutes to obtain the finished product.

[0039] Embodiment three:

[0040]

[0041] Preparation method

[0042] 1. During the preparation, difunctional aliphatic polyurethane acrylate, isobornyl methacrylate and hydroxypropyl methacrylate, p-benzoquinone and tetrasodium ethylenediaminetetraacetate were added into a reaction kettle and stirred at 50°C for 60 minutes.

[0043] 2. Then add N,N-phenylene bismaleimide, B-625, triethylamine and acrylic acid in sequence under stirring and disperse evenly at 50-60°C.

[0044] 3. Cool to room temperature, add cumene hydroperoxide and stir for 120 minutes to obtain the finished product.

[0045] Comparative Example:

[0046]

[0047]

[0048] Preparation method

[0049] During the preparation, difunctional aliphatic polyurethane acrylate, polyethylene glycol 400 dimethacrylate and hydroxyethyl methacrylate are added to a reaction kettle with naphthoquinone and tetrasodium ethylenediaminetetraacetate, and stirred and mixed for 60 minutes at 50°C. Then, acetophenylhydrazine and o-benzenesulfonimide are added in sequence under stirring and dispersed evenly at 50-60°C. After cooling to room temperature, cumene hydroperoxide is added and stirred for 120 minutes to obtain the finished product.

[0050] The relevant properties of the anaerobic adhesives of Examples 1 to 3 and Comparative Examples were tested using the following methods.

[0051] Determination of initial fixation time: Apply sufficient glue evenly on the specified area (about 12.5*25mm) of the stainless steel test piece, and then test the time from glue application to pulling up a 3 kg weight at 23±1℃.

[0052] Tensile strength reference standard: GB 7124-2008 Adhesive tensile shear strength determination method (metal to metal).

[0053] Table 1

[0054]

[0055] As can be seen from the table above, compared with the comparative example, the heat resistance and toughness of the present invention are significantly improved, and the bonding strength is still relatively high at 200°C.

[0056] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A structural anaerobic adhesive for high temperature resistant magnetic steel bonding, characterized in that: Structural anaerobic adhesives are composed of the following components in percentage by mass:

2. The structural anaerobic adhesive for high temperature resistant magnetic steel bonding according to claim 1, characterized in that: The polyurethane acrylate monomer is selected from one or a mixture of two functional aliphatic or aromatic polyurethane acrylates.

3. The structural anaerobic adhesive for high temperature resistant magnetic steel bonding according to claim 1, characterized in that: The methacrylate monomer is selected from one or a mixture of polyethylene glycol 400 dimethacrylate, triethylene glycol dimethacrylate, ethoxylated bisphenol A dimethacrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate, isobornyl methacrylate, methyltetrahydrofuran acrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate.

4. The structural anaerobic adhesive for bonding high temperature resistant magnetic steel according to claim 1, characterized in that: The polymerization inhibitor is selected from at least one of p-tert-butylphenol, hydroquinone, p-benzoquinone, naphthoquinone, anthraquinone and p-methoxyphenol.

5. The structural anaerobic adhesive for bonding high temperature resistant magnetic steel according to claim 1, characterized in that: The metal ion chelating agent is selected from disodium ethylenediaminetetraacetate or tetrasodium ethylenediaminetetraacetate.

6. The structural anaerobic adhesive for bonding high temperature resistant magnetic steel according to claim 1, characterized in that: The accelerator is selected from at least one of acetophenylhydrazine, tetramethylthiourea, triethylamine, N,N-dimethyl-p-toluidine, and N,N-diethyl-p-toluidine, and the auxiliary accelerator is selected from at least one of o-benzenesulfonimide, phthalimide, ascorbic acid, maleic acid, and acrylic acid.

7. The structural anaerobic adhesive for bonding high temperature resistant magnetic steel according to claim 1, characterized in that: The bismaleimide heat-resistant auxiliary agent is selected from one of N,N-phenylene bismaleimide and diphenylmethane bismaleimide.

8. The structural anaerobic adhesive for bonding high temperature resistant magnetic steel according to claim 1, characterized in that: The core-shell structure anti-impact modifier is a methyl methacrylate-butadiene-styrene terpolymer (MBS), and its model is one of Rohm and Haas EXL-2620 or EXL-2691, LG EM500, Japan Kanebuchi B-625 or M-711.

9. The structural anaerobic adhesive for bonding high temperature resistant magnetic steel according to claim 1, characterized in that: The initiator is selected from one of cumene hydroperoxide and tert-butyl hydroperoxide.

10. The method for preparing a structural anaerobic adhesive for bonding high temperature resistant magnetic steel according to claims 1-9, characterized in that: The following steps are involved: 1) adding polyurethane acrylate and methacrylate monomers, a stabilizer and a metal ion chelating agent into a reaction kettle, and stirring and mixing at 50° C. for 60 minutes; 2) Add bismaleimide, core-shell structure anti-impact modifier, accelerator and co-accelerator in sequence under stirring and disperse evenly at 50-60°C; 3) After cooling to room temperature, add peroxide initiator and stir for 120 minutes to obtain the finished product.

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