CN109439233B - Environment-friendly acrylate structural adhesive and preparation method thereof - Google Patents

Environment-friendly acrylate structural adhesive and preparation method thereof Download PDF

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CN109439233B
CN109439233B CN201811311259.2A CN201811311259A CN109439233B CN 109439233 B CN109439233 B CN 109439233B CN 201811311259 A CN201811311259 A CN 201811311259A CN 109439233 B CN109439233 B CN 109439233B
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methacrylate
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structural adhesive
acrylate structural
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CN109439233A (en
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姜贵琳
王建斌
陈田安
解海华
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Yantai Darbond Technology Co Ltd
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Yantai Darbond Technology Co Ltd
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Abstract

The invention relates to an environment-friendly acrylate structural adhesive and a preparation method thereof, and the prepared acrylate adhesive overcomes the defects of large pungent smell, sticky adhesive layer surface after curing and poor impact resistance of the traditional acrylate structural adhesive, is used in the consumer electronics assembly industry and the general industrial field, has low smell, good surface drying performance, good bonding mechanical property and impact resistance, can greatly improve the field use environment of a production line, improves the production efficiency, and has important promotion significance for improving the technical level of the acrylate structural adhesive.

Description

Environment-friendly acrylate structural adhesive and preparation method thereof
Technical Field
The invention relates to an acrylate structural adhesive and a preparation method thereof, in particular to an acrylate adhesive used in the assembling industry of consumer electronics and electric appliances and the general industrial field, belonging to the technical field of chemical adhesives.
Background
The acrylate adhesive has the advantages of fast curing at room temperature, good toughness, good fatigue resistance, capability of being bonded with oil and the like, becomes an important category of engineering adhesive, and is widely applied to the fields of industry and electronic appliances.
However, most of the acrylate structural adhesives in the current market adopt methyl methacrylate with low boiling point and high volatility as a monomer, and the product has large pungent smell, is easy to cause human olfaction and respiratory tract allergy and even lesion, and has very serious harm to human health and environment. Currently, with the progress of society and the enhancement of environmental awareness, the development of low-odor, environmentally friendly acrylate adhesives that are harmless to the human body and the environment is urgent.
In order to reduce the odor irritation of the current acrylate structural adhesive, people remove methyl methacrylate with low boiling point and high volatility in the formula and replace the methyl methacrylate with high boiling point and low volatility with an acrylate monomer with high boiling point, which indeed reduces the odor of the product, but also causes another important defect that the curing speed is slow, the surface of the cured adhesive layer is sticky, the surface dryness is poor, and the performance and the using process requirements of the adhesive cannot be met. In addition, the adoption of methyl methacrylate as a formula monomer has the defects of relatively brittle products and very poor impact resistance.
Therefore, the three defects of large pungent smell, sticky surface of an adhesive layer after curing and poor impact resistance of the traditional acrylate structural adhesive are overcome, and the development of a new acrylate structural adhesive has important promotion significance for improving the technical level of the acrylate structural adhesive.
Disclosure of Invention
In order to overcome the defects of the acrylate structural adhesive in the prior art, the invention provides the environment-friendly acrylate structural adhesive and the preparation method thereof, and the prepared product is a solvent-free adhesive.
The technical scheme of the invention is as follows:
the environment-friendly acrylate structural adhesive comprises a component A and a component B which are mixed according to a volume ratio of 10:1, wherein the component A comprises 10-25 parts of hydroxyalkyl methacrylate, 10-45 parts of methacrylate, 5-25 parts of methacrylic acid, 15-50 parts of prepolymer, 8-35 parts of toughening filler, 0.5-5.0 parts of accelerator, 0.01-0.6 part of polymerization inhibitor and 0.1-2.0 parts of surface curing promoter in parts by weight; the component B comprises: 10-45 parts of peroxide initiator, 15-45 parts of plasticizer, 8-35 parts of toughening filler and 5-25 parts of thixotropic agent fumed silica;
wherein the surface curing promoter is one or a mixture of liquid paraffin, chlorinated paraffin, polyethylene wax, methyl silicone oil and solid paraffin;
the methacrylate is one or a mixture of more of tetrahydrofuran methacrylate, ethylene glycol dimethacrylate, indene methacrylate and butyl methacrylate with high boiling point and low volatility;
the preparation steps of the prepolymer are as follows: heating and stirring 40-70 parts of composite special polyol, 2-9 parts of hydrogenated bisphenol A, 10-28 parts of isobornyl methacrylate and 6-16 parts of xylene formaldehyde resin until all components are dissolved, carrying out vacuum dehydration at 100-110 ℃, then cooling to 70-80 ℃, adding 0.01-0.09 part of catalyst, 0.001-0.015 part of polymerization inhibitor and 6-18 parts of polyisocyanate, and reacting for 1-3 hours; adding 5-20 parts of hydroxyalkyl methacrylate, and reacting for 2-5 hours to obtain a prepolymer;
the composite special polyol is one or a mixture of polyether polyol, polyester polyol, polyolefin polyol and vegetable oil polyol;
the catalyst is one of dibutyltin dilaurate, stannous octoate, lead octoate, triethylamine, triethylenediamine, cobalt octoate, zinc naphthenate, tetraisobutyl titanate and dimorpholinyl diethyl ether.
The research and development ideas of the acrylate structural adhesive are as follows: synthesizing a prepolymer with a special structure, wherein the molecule of the prepolymer has a rigid and flexible block structure simultaneously, and hydrogenated bisphenol A and xylene formaldehyde resin respectively endow the product with rigidity and flexibility, chemical resistance and hydrolysis resistance, and can well endow the product with impact resistance; meanwhile, the molecular end group of the prepolymer is an acrylic double bond structure, the activity is strong, and the prepolymer can replace methyl methacrylate by being matched with hydroxyalkyl methacrylate, so that the volatilization of smell is greatly reduced. In addition, the acrylic acid modified acrylic acid.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the polyether polyol is polyoxypropylene glycol or polytetramethylene ether glycol; the polyester polyol is adipic acid neopentyl glycol polyester diol, poly (diethylene glycol phthalate) diol or polycarbonate diol; the polyolefin polyol is hydroxyl-terminated polybutadiene, hydroxyl-terminated polybutadiene-acrylonitrile or hydroxyl-terminated styrene-butadiene liquid rubber; the vegetable oil polyol is castor oil derivative polyol or soybean oil polyol. The composite special polyol is preferably PPG-2000, PPG-1000, PTMEG-2000, PTMEG-3000, PMA-2000, PCDL-2000, PS-70L (Stepan company, USA), R-45HT (CrayValley company), Nisso PB (Nissah Kao Co., Ltd.) or HTBS-II (Zibozilong chemical company).
The further scheme has the beneficial effects that the selection and compounding of the special polyols endow the product with good bonding property and impact resistance.
Further, the plasticizer is one or a mixture of more of dioctyl phthalate, dibutyl phthalate, dioctyl adipate, dioctyl sebacate, bisphenol A type epoxy resin and bisphenol F type epoxy resin; the preferred plasticizer is environmental friendly plasticizer Benzoflex 2088, bisphenol A epoxy resin E-51 or bisphenol F epoxy resin NPEL-170.
The further scheme has the advantages that the toughness and initial adhesion of the product can be improved, and the dispersibility of the initiator is improved.
Further, the toughening filler is one or a mixture of more of nitrile rubber, ABS resin, SBS resin, MBS resin, polyethylene powder, polytetrafluoroethylene powder and acrylate rubber; the toughening filler is preferably one or a mixture of more of domestic nitrile butadiene rubber NBR1704, nitrile butadiene rubber N41, American Keteng SBS resin D1155, ABS resin KR2883 and ABS resin Blendex 338.
The further scheme has the beneficial effects that the toughening filler can reduce the curing shrinkage rate of the adhesive, improve the capability of the adhesive layer body for absorbing impact energy, and simultaneously improve the cold and hot impact resistance and the aging resistance of the product.
Further, the accelerant is one or a mixture of more of tetramethyl thiourea, triethylamine, N-dimethyl-p-toluidine, N-diethyl-o-toluidine and N, N-dihydroxyethyl-p-toluidine.
The further scheme has the beneficial effects that the accelerator can improve the curing speed and the curing degree of the product and improve the surface drying performance.
Further, the hydroxyalkyl methacrylate is one of hydroxyethyl methacrylate, hydroxypropyl methacrylate and hydroxybutyl methacrylate.
Further, the polymerization inhibitor is one or more of phenothiazine, hydroquinone, 2-tert-butylhydroquinone, 2, 5-di-tert-butylhydroquinone, p-hydroxyanisole, p-benzoquinone and methyl hydroquinone.
Further, the polyisocyanate is one of toluene diisocyanate, diphenylmethane-4, 4' -diisocyanate, hexamethylene diisocyanate, 1, 5-naphthalene diisocyanate, m-xylylene diisocyanate, polymethine polyphenyl polyisocyanate, 2, 4-toluene diisocyanate trimer, hydrogenated TDI and hydrogenated MDI; the preferred polyisocyanate is one of diphenylmethane-4, 4' -diisocyanate (MDI-100), toluene diisocyanate (TDI-100), and hydrogenated TDI.
Further, the peroxide initiator is one or a mixture of several of benzoyl peroxide, cumene hydroperoxide, tert-butyl peroxybenzoate and dicumyl peroxide.
The environment-friendly acrylate structural adhesive has the following advantages:
(1) the product does not contain methyl methacrylate with low boiling point and high volatility, has low smell and is harmless to human bodies and the environment;
(2) the synthetic oligomer with a special structure is matched with a surface curing promoter, so that the product has good surface curing performance and no sticky phenomenon on the solid surface;
(3) the cured adhesive has excellent bonding performance and impact resistance, and is greatly improved compared with the traditional structural adhesive; (4) the aging resistance is excellent, and the reliability test requirement of the product is met;
the acrylate adhesive prepared by the invention overcomes the defects of large pungent smell, sticky adhesive layer surface after curing and poor impact resistance of the traditional acrylate structural adhesive, is used in the consumer electronics and electric appliance assembly industry and the general industrial field, has good adhesive property and impact resistance, simultaneously has lower smell and good surface drying property, can greatly improve the field use environment of a production line, improves the production efficiency, brings great improvement to the acrylic acid structural adhesive industry, and has great market potential.
The invention also claims a preparation method of the environment-friendly acrylate structural adhesive, which comprises the following steps:
1) preparing a prepolymer: heating and stirring 40-70 parts of composite special polyol, 2-9 parts of hydrogenated bisphenol A, 10-28 parts of isobornyl methacrylate and 6-16 parts of xylene formaldehyde resin until all components are dissolved, carrying out vacuum dehydration at 100-110 ℃, then cooling to 70-80 ℃, adding 0.01-0.09 part of catalyst, 0.001-0.015 part of polymerization inhibitor and 6-18 parts of polyisocyanate, and reacting for 1-3 hours; adding 5-20 parts of hydroxyalkyl methacrylate, and reacting for 2-5 hours to obtain a prepolymer;
2) preparing a component A: 10-25 parts of hydroxyalkyl methacrylate, 10-45 parts of methacrylate, 5-25 parts of methacrylic acid, 15-50 parts of the prepolymer prepared in the step 1), 8-35 parts of toughening filler, 0.5-5.0 parts of accelerator, 0.01-0.6 part of polymerization inhibitor and 0.1-2.0 parts of surface curing promoter are stirred and mixed, defoamed, discharged and hermetically packaged to prepare a component A;
3) preparing a component B: stirring and mixing 10-45 parts of initiator, 15-45 parts of plasticizer, 8-35 parts of toughening filler and 5-25 parts of thixotropic agent fumed silica, defoaming and discharging, and hermetically packaging to obtain a component B;
4) and mixing the component A and the component B according to the volume ratio of 10:1 at the temperature of 20-35 ℃ to obtain the acrylate structural adhesive.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The raw materials in the following examples are in parts by weight.
Example 1:
an environment-friendly acrylate structural adhesive comprises a component A and a component B which are mixed according to the volume ratio of 10:1, wherein the component A comprises 10 parts of hydroxypropyl methacrylate, 45 parts of tetrahydrofuran methacrylate, 25 parts of methacrylic acid, 16 parts of prepolymer, 22 parts of nitrile rubber N41, 5.0 parts of tetramethyl thiourea, 0.6 part of 2, 5-di-tert-butyl hydroquinone and 2.0 parts of liquid paraffin; the component B comprises 28 parts of benzoyl peroxide, 30 parts of an environment-friendly plasticizer Benzoflex 2088, 35 parts of polyethylene powder and 17 parts of thixotropic agent fumed silica;
the preparation method of the prepolymer is as follows: 30 parts of polyether polyol PPG-2000, 10 parts of polyester polyol PS-70L, 9 parts of hydrogenated bisphenol A, 28 parts of isobornyl methacrylate and 16 parts of xylene formaldehyde resin are heated and stirred until the components are dissolved, the mixture is dehydrated for 2 hours at 110 ℃ and under the pressure of-0.095 MPa, the temperature is reduced to 70 ℃, 0.05 part of dibutyltin dilaurate, 0.001 part of hydroquinone and 18 parts of TDI-100 are added, and the mixture is reacted for 3 hours at the temperature of 75 ℃. Then 20 parts of hydroxyethyl methacrylate is added to react for 5 hours at 80 ℃ to prepare the prepolymer.
Example 2:
an environment-friendly acrylate structural adhesive comprises a component A and a component B which are mixed according to the volume ratio of 10:1, wherein the component A comprises 25 parts of hydroxyethyl methacrylate, 28 parts of ethylene glycol dimethacrylate, 16 parts of methacrylic acid, 50 parts of prepolymer, 35 parts of SBS resin D1155, 2.7 parts of triethylamine, 0.01 part of 2-tert-butylhydroquinone and 1.0 part of polyethylene wax; the component B comprises 10 parts of tert-butyl hydroperoxide, 45 parts of bisphenol F type epoxy resin NPEL-170, 22 parts of polytetrafluoroethylene powder and 5 parts of thixotropic agent fumed silica;
the preparation method of the prepolymer is as follows: 35 parts of polyolefin polyol R-45HT, 20 parts of polycarbonate diol PCDL-2000, 5 parts of hydrogenated bisphenol A, 19 parts of isobornyl methacrylate and 11 parts of xylene formaldehyde resin are heated and stirred until all components are dissolved, dehydrated for 2 hours at 110 ℃ and under the pressure of-0.095 MPa, cooled to 80 ℃, added with 0.09 part of stannous octoate, 0.015 part of p-benzoquinone and 12 parts of MDI-100, and reacted for 2 hours at 80 ℃. Then 13 parts of hydroxypropyl methacrylate is added to react for 3 hours at the temperature of 75 ℃ to prepare the prepolymer of the methacrylate molecular end capping of the invention.
Example 3:
an environment-friendly acrylate structural adhesive comprises a component A and a component B which are mixed according to the volume ratio of 10:1, wherein the component A comprises 17 parts of hydroxypropyl methacrylate, 10 parts of indene methacrylate, 5 parts of methacrylic acid, 32 parts of prepolymer, 8 parts of ABS resin Blendex 338, 0.5 part of N, N-diethyl-o-toluidine, 0.3 part of phenothiazine and 0.1 part of methyl silicone oil; the component B comprises 45 parts of tert-butyl peroxybenzoate, 15 parts of bisphenol A epoxy resin E-51, 8 parts of MBS resin and 25 parts of thixotropic agent fumed silica;
the preparation method of the prepolymer is as follows: 50 parts of polytetrahydrofuran glycol PTMEG-3000, 20 parts of polyolefin polyol HTBS-II, 2 parts of hydrogenated bisphenol A, 10 parts of isobornyl methacrylate and 6 parts of xylene formaldehyde resin are heated and stirred until the components are dissolved, dehydrated for 2 hours at 100 ℃ and 0.095MPa, cooled to 70 ℃, added with 0.01 part of tetraisobutyl titanate, 0.010 part of p-hydroxyanisole and 6 parts of hydrogenated TDI, and reacted for 1 hour at 70 ℃. Then 5 parts of hydroxybutyl methacrylate is added to react for 2 hours at 70 ℃, thus obtaining the prepolymer of the methacrylate molecular end capping of the invention.
Example 4:
an environment-friendly acrylate structural adhesive comprises a component A and a component B which are mixed according to the volume ratio of 10:1, wherein the component A comprises 17 parts of hydroxypropyl methacrylate, 25 parts of butyl methacrylate, 15 parts of methacrylic acid, 35 parts of prepolymer, 15 parts of ABS resin Blendex 338, 1.5 parts of N, N-dimethyl-p-toluidine, 0.2 part of p-benzoquinone and 0.8 part of chlorinated paraffin; the component B comprises 25 parts of dicumyl peroxide (DCP), 30 parts of dioctyl adipate, 8 parts of SBS resin and 25 parts of thixotropic agent fumed silica;
the preparation method of the prepolymer is as follows: 35 parts of soybean oil polyol, 20 parts of polyolefin polyol HTBS-II, 2 parts of hydrogenated bisphenol A, 10 parts of isobornyl methacrylate and 6 parts of xylene formaldehyde resin are heated and stirred until the components are dissolved, dehydrated for 2 hours at 100 ℃ and 0.095MPa, cooled to 70 ℃, added with 0.01 part of triethylamine, 0.010 part of p-hydroxyanisole and 6 parts of hexamethylene diisocyanate, and reacted for 1 hour at 70 ℃. Then 5 parts of hydroxybutyl methacrylate is added to react for 2 hours at 70 ℃, thus obtaining the prepolymer of the methacrylate molecular end capping of the invention.
Example 5:
an environment-friendly acrylate structural adhesive comprises a component A and a component B which are mixed according to the volume ratio of 10:1, wherein the component A comprises 17 parts of hydroxypropyl methacrylate, 10 parts of indene methacrylate, 5 parts of methacrylic acid, 32 parts of prepolymer, 8 parts of acrylate rubber, 3.5 parts of N, N-dihydroxyethyl p-toluidine, 0.5 part of hydroquinone and 1.5 parts of solid paraffin; the component B comprises 35 parts of isopropyl benzene peroxide, 20 parts of dioctyl sebacate, 25 parts of SBS resin D1155 and 25 parts of thixotropic agent fumed silica;
the preparation method of the prepolymer is as follows: 50 parts of polytetrahydrofuran glycol PTMEG-3000, 20 parts of polyolefin polyol HTBS-II, 2 parts of hydrogenated bisphenol A, 10 parts of isobornyl methacrylate and 6 parts of xylene formaldehyde resin are heated and stirred until the components are dissolved, dehydrated for 2 hours at 100 ℃ and 0.095MPa, cooled to 70 ℃, added with 0.01 part of dimorpholinyl diethyl ether, 0.005 part of methyl hydroquinone and 6 parts of 2, 4-toluene diisocyanate trimer and reacted for 1 hour at 70 ℃. Then 5 parts of hydroxybutyl methacrylate is added to react for 2 hours at 70 ℃ to prepare the prepolymer.
The preparation method of the acrylate structural adhesive of the embodiment 1-5 comprises the following steps: respectively stirring and mixing the raw materials of the component A and the component B, defoaming and discharging, and hermetically packaging to obtain the component A and the component B; when the paint is used, the component A and the component B are uniformly stirred and mixed according to the volume ratio of 10:1 at the temperature of 20-35 ℃ for use. After the initial curing was completed, the plate was left at room temperature for 72 hours to conduct a performance test. The bonding material is PC-PC. Comparative example:
the traditional acrylate structural adhesive is a two-component adhesive, and the formula and the production process are as follows:
the component A comprises: 15 parts of methyl methacrylate, 14 parts of hydroxyethyl methacrylate, 6 parts of methacrylic acid, 22 parts of nitrile rubber, 0.02 part of hydroquinone and 1.2 parts of tetramethyl thiourea are stirred, mixed, defoamed and discharged, and hermetically packaged to prepare a component A of the double-component acrylate adhesive.
And the component B comprises: and stirring and mixing 20 parts of dibutyl phthalate, 25 parts of polyethylene powder, 20 parts of benzoyl peroxide and 4 parts of fumed silica, defoaming and discharging, and hermetically packaging to obtain a component B of the double-component acrylate adhesive.
When in use, the component A and the component B are mixed according to the volume ratio of 10:1, and are uniformly mixed for use in the environment of 20-35 ℃. After the initial curing was completed, the plate was left at room temperature for 72 hours to conduct a performance test. The bonding material is PC-PC.
The acrylate structural adhesives prepared in the above examples 1 to 3 and the acrylate structural adhesives prepared in the comparative examples were subjected to tests of odor irritation, surface dry condition, tensile strength, elongation at break, peel strength, shear strength, impact toughness, and roller drop according to test standards, and the data results are shown in tables 1, 2, and 3. And uniformly mixing the AB components in proportion, and then standing at room temperature for 72 hours for testing. The bonding mechanical property is characterized according to the values of tensile strength, elongation at break, peeling strength and shearing strength. The impact resistance is characterized according to the value of the impact toughness and the falling frequency of the roller.
Table 1 comparison of acrylate structural adhesives of examples 1-3 and comparative examples for odor irritation and tack-free condition
Figure BDA0001855057810000101
Table 2 comparison of mechanical property tests of acrylate structural adhesives obtained in examples 1-3 and comparative example
Figure BDA0001855057810000102
Table 3 comparison of impact resistance tests of acrylate structural adhesives obtained in examples 1-3 and comparative example
Figure BDA0001855057810000111
In a word, performance test analysis of the acrylate structural adhesive obtained in the embodiments 1 to 3 and the comparative embodiment shows that the acrylate structural adhesive prepared by the invention has low odor, good surface drying performance, good bonding mechanical property and impact resistance, can greatly improve the field use environment of a production line, improves the production efficiency, and has an important promotion significance for improving the technical level of the acrylate structural adhesive.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The environment-friendly acrylate structural adhesive comprises a component A and a component B which are mixed according to the volume ratio of 10:1, and is characterized in that the component A comprises 10-25 parts of hydroxyalkyl methacrylate, 10-45 parts of methacrylate, 5-25 parts of methacrylic acid, 15-50 parts of prepolymer, 8-35 parts of toughening filler, 0.5-5.0 parts of accelerator, 0.01-0.6 part of polymerization inhibitor and 0.1-2.0 parts of surface curing promoter in parts by weight; the component B comprises: 10-45 parts of peroxide initiator, 15-45 parts of plasticizer, 8-35 parts of toughening filler and 5-25 parts of thixotropic agent fumed silica;
wherein the surface curing promoter is one or a mixture of liquid paraffin, chlorinated paraffin, polyethylene wax, methyl silicone oil and solid paraffin;
the methacrylate is one or a mixture of more of tetrahydrofuran methacrylate, ethylene glycol dimethacrylate, indene methacrylate and butyl methacrylate;
the preparation method of the prepolymer comprises the following steps: heating and stirring 40-70 parts of composite special polyol, 2-9 parts of hydrogenated bisphenol A, 10-28 parts of isobornyl methacrylate and 6-16 parts of xylene formaldehyde resin until all components are dissolved, carrying out vacuum dehydration at 100-110 ℃, then cooling to 70-80 ℃, adding 0.01-0.09 part of catalyst, 0.001-0.015 part of polymerization inhibitor and 6-18 parts of polyisocyanate, and reacting for 1-3 hours; adding 5-20 parts of hydroxyalkyl methacrylate, and reacting for 2-5 hours to obtain a prepolymer;
the composite special polyol is one or a mixture of polyether polyol, polyester polyol, polyolefin polyol and vegetable oil polyol;
the catalyst is one of dibutyltin dilaurate, stannous octoate, lead octoate, triethylamine, triethylenediamine, cobalt octoate, zinc naphthenate, tetraisobutyl titanate and dimorpholinyl diethyl ether;
the polyether polyol is polyoxypropylene glycol or polytetramethylene ether glycol; the polyester polyol is adipic acid neopentyl glycol polyester diol, poly (diethylene glycol phthalate) diol or polycarbonate diol; the polyolefin polyol is hydroxyl-terminated polybutadiene, hydroxyl-terminated polybutadiene-acrylonitrile or hydroxyl-terminated styrene-butadiene liquid rubber; the vegetable oil polyalcohol is castor oil derivative polyalcohol or soybean oil polyalcohol;
the plasticizer is one or a mixture of more of dioctyl phthalate, dibutyl phthalate, dioctyl adipate, dioctyl sebacate, bisphenol A type epoxy resin and bisphenol F type epoxy resin.
2. The acrylate structural adhesive according to claim 1, wherein the toughening filler is one or a mixture of more of nitrile rubber, ABS resin, SBS resin, MBS resin, polyethylene powder, polytetrafluoroethylene powder and acrylate rubber.
3. The acrylate structural adhesive according to claim 1, wherein the accelerator is one or a mixture of more of tetramethyl thiourea, triethylamine, N-dimethyl-p-toluidine, N-diethyl-o-toluidine, and N, N-dihydroxyethyl-p-toluidine.
4. The acrylate structural adhesive of claim 1, wherein the hydroxyalkyl methacrylate is one of hydroxyethyl methacrylate, hydroxypropyl methacrylate and hydroxybutyl methacrylate.
5. The acrylate structural adhesive according to claim 1, wherein the polymerization inhibitor is one or a mixture of phenothiazine, hydroquinone, 2-tert-butylhydroquinone, 2, 5-di-tert-butylhydroquinone, p-hydroxyanisole, p-benzoquinone and methyl hydroquinone.
6. The acrylate structural adhesive according to claim 1, wherein the polyisocyanate is one of toluene diisocyanate, diphenylmethane-4, 4' -diisocyanate, hexamethylene diisocyanate, 1, 5-naphthalene diisocyanate, m-xylylene diisocyanate, polymethine polyphenyl polyisocyanate, 2, 4-toluene diisocyanate trimer, hydrogenated TDI, and hydrogenated MDI.
7. The acrylate structural adhesive according to claim 1, wherein the peroxide initiator is one or more of benzoyl peroxide, cumene hydroperoxide, tert-butyl peroxybenzoate and dicumyl peroxide.
8. The preparation method of the acrylate structural adhesive according to any one of claims 1 to 7, characterized by comprising the following steps:
1) preparing a prepolymer: heating and stirring 40-70 parts of composite special polyol, 2-9 parts of hydrogenated bisphenol A, 10-28 parts of isobornyl methacrylate and 6-16 parts of xylene formaldehyde resin until all components are dissolved, carrying out vacuum dehydration at 100-110 ℃, then cooling to 70-80 ℃, adding 0.01-0.09 part of catalyst, 0.001-0.015 part of polymerization inhibitor and 6-18 parts of polyisocyanate, and reacting for 1-3 hours; adding 5-20 parts of hydroxyalkyl methacrylate, and reacting for 2-5 hours to obtain a prepolymer;
2) preparing a component A: 10-25 parts of hydroxyalkyl methacrylate, 10-45 parts of methacrylate, 5-25 parts of methacrylic acid, 15-50 parts of the prepolymer prepared in the step 1), 8-35 parts of toughening filler, 0.5-5.0 parts of accelerator, 0.01-0.6 part of polymerization inhibitor and 0.1-2.0 parts of surface curing promoter are stirred and mixed, defoamed, discharged and hermetically packaged to prepare a component A;
3) preparing a component B: stirring and mixing 10-45 parts of initiator, 15-45 parts of plasticizer, 8-35 parts of toughening filler and 5-25 parts of thixotropic agent fumed silica, defoaming and discharging, and hermetically packaging to obtain a component B;
4) and mixing the component A and the component B according to the volume ratio of 10:1 at the temperature of 20-35 ℃ to obtain the acrylate structural adhesive.
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