CN111073570B - Medium-temperature curing high-toughness epoxy adhesive and preparation method thereof - Google Patents
Medium-temperature curing high-toughness epoxy adhesive and preparation method thereof Download PDFInfo
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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Abstract
The invention discloses a medium-temperature curing high-toughness epoxy adhesive, which comprises a component A and a component B, wherein the ratio of the component A to the component B is 0.9-1.1: 1.1-0.9; the component A comprises the following components in parts by mass: 80-120 parts of epoxy resin; 6-20 parts of an active diluent; 20-40 parts of a toughening agent; 30-60 parts of a filler; 2-10 parts of a thixotropic agent; the component B comprises the following components in parts by mass: 10-50 parts of a low-molecular-weight polyamide curing agent; 20-60 parts of a modified amine curing agent; 1-5 parts of an accelerator; 40-80 parts of a filler; 1-5 parts of a thixotropic agent. The invention also discloses a preparation method of the composition. The winding interlocking interpenetrating network structure formed by the medium-temperature curing high-toughness epoxy adhesive disclosed by the invention is beneficial to rapid transmission and dispersion of stress, and can realize the adhesive joint of various automobile lightweight materials, including aluminum plates, honeycomb aluminum interlayers and carbon fiber composite materials.
Description
Technical Field
The invention belongs to the technical field of epoxy adhesives, and particularly relates to a medium-temperature curing high-toughness epoxy adhesive and a preparation method thereof.
Background
In recent years, the automobile industry is developing towards new energy, light weight, intellectualization and internet connection, and better experience and comfort are more and more favored by consumers while ensuring safety. The light weight is an important way for realizing energy conservation and emission reduction of the automobile industry. The concept of replacing steel with aluminum and replacing steel with plastic is leading in policy and industrial transformation development in China and secretly entering the automobile industry, and the novel materials can reduce weight and energy consumption and replace traditional welding and riveting in a gluing mode, so that the quality effect of automobile products is improved.
The adhesive used in the light weight of the automobile needs to meet various requirements of high strength, good toughness, fatigue resistance, aging resistance, capability of bonding heterogeneous materials and the like.
The epoxy resin adhesive has the characteristics of wide bonding objects, light weight, small volume shrinkage and the like, so that the epoxy resin adhesive is widely and successfully applied. However, epoxy resins have disadvantages of high brittleness and poor impact toughness, and thus have limited applications in the field of automobile weight reduction.
Therefore, in order to meet the development requirement of automobile light weight, it is necessary to develop a medium-temperature curing high-toughness epoxy adhesive so as to achieve better automobile light weight effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a medium-temperature-cured high-toughness epoxy adhesive.
The second purpose of the invention is to provide a preparation method of the medium-temperature curing high-toughness epoxy adhesive.
In order to achieve one of the purposes of the invention, the following technical scheme is adopted:
the medium-temperature curing high-toughness epoxy adhesive comprises a component A and a component B, wherein the ratio of the component A to the component B is 0.9-1.1: 1.1-0.9; wherein the content of the first and second substances,
the component A comprises the following components in parts by weight:
80-120 parts of epoxy resin;
6-20 parts of an active diluent;
20-40 parts of a toughening agent;
30-60 parts of a filler;
2-10 parts of a thixotropic agent;
the component B comprises the following components in parts by weight:
10-50 parts of a low-molecular-weight polyamide curing agent;
20-60 parts of a modified amine curing agent;
1-5 parts of an accelerator;
40-80 parts of a filler;
1-5 parts of a thixotropic agent.
In a preferred embodiment of the present invention, the epoxy resin is any one or more of bisphenol a type epoxy resin, hydrogenated bisphenol a type epoxy resin, and bisphenol F type epoxy resin.
In a preferred embodiment of the present invention, the bisphenol A type epoxy resin is any one or more of E-42, E-51, E-44; the hydrogenated epoxy resin is EP-4080E from Aidicco, Japan; the bisphenol F type epoxy resin is NPEL-170 of south Asia resin company.
In a preferred embodiment of the present invention, the reactive diluent is any one or more of 1, 4-butanediol diglycidyl ether (622), trimethylol triglycidyl ether (636), and 1, 6-hexanediol diglycidyl ether (632).
In a preferred embodiment of the invention, the toughening agent is a silicone hybrid polyurethane elastomer.
In a preferred embodiment of the present invention, the toughening agent is prepared by the following steps:
1) reacting 100-200 parts of polyether polyol and 30-50 parts of excessive diisocyanate at 80 ℃ to prepare an isocyanate-terminated prepolymer;
2) 100-150 parts of isocyanate-terminated prepolymer and 10-30 parts of silane coupling agent are mixed in a reaction kettle, and then the mixture is stirred at the speed of 200-500 rpm to react for 60 minutes and then discharged, so that the siloxane hybrid polyurethane elastomer is prepared.
In a preferred embodiment of the present invention, the polyether polyol is any one or more of N330, N220, N210; the diisocyanate is Toluene Diisocyanate (TDI).
In a preferred embodiment of the present invention, the silane coupling agent is a mixture of gamma-aminopropyltriethoxysilane (KH550) and gamma- (2, 3-glycidoxy) propyltrimethoxysilane (KH 560).
In a preferred embodiment of the invention, the low molecular weight polyamide curing agent is polyamide which is any one or more of D0200, D3200 and D811 of Shanghai Junjiang materials science and technology Co., Ltd or YD-8225, YD-8140A, YD-8400 of Jiangxi Yichun far-reaching chemical industry Co., Ltd.
In a preferred embodiment of the invention, the modified amine curing agent is any one or more of R2018, R2283 and R2257 of Guangzhou Ruichi chemical engineering Co., Ltd, or JH-5408, JH-5328 and JH-5280 of Shenzhen Jia Dida New Material science and technology Co., Ltd.
In a preferred embodiment of the invention, the promoter is 2,4, 6-tris (dimethylaminomethyl) phenol (DMP-30).
In a preferred embodiment of the present invention, the filler is any one or more of mica powder, silica micropowder, ultrafine talc powder, nano calcium carbonate and glass fiber powder.
In a preferred embodiment of the invention, the thixotropic agent is hydrophobic fumed silica (WACKER)
V15)。
In order to realize the second purpose of the invention, the adopted technical scheme is as follows:
a preparation method of a medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
the preparation of the component A comprises the following steps:
sequentially adding the epoxy resin, the reactive diluent, the toughening agent, the filler and the thixotropic agent into a stirrer, stirring and mixing at 200-500 rpm, performing vacuum defoaming after mixing, and filtering and packaging to obtain the component A colloid;
the preparation step of the component B:
and adding the low-molecular-weight polyamide curing agent, the modified amine curing agent, the accelerator, the filler and the thixotropic agent into a stirrer, stirring and mixing at 200-500 r/min, performing vacuum defoaming after mixing, and filtering and packaging to obtain the component B colloid.
After the component A and the component B are respectively prepared, the component A and the component B are combined for use according to actual construction requirements.
The preferred mass ratio of the component A to the component B is 1: the mixing method of 1 is used in combination.
The invention has the beneficial effects that:
the winding interlocking interpenetrating network structure formed by the medium-temperature curing high-toughness epoxy adhesive disclosed by the invention is beneficial to rapid transmission and dispersion of stress, and can realize the adhesive joint of various automobile lightweight materials, including aluminum plates, honeycomb aluminum interlayers, carbon fiber composite materials and the like.
Meanwhile, the room temperature shear strength of the network structure to aviation aluminum materials reaches 35MPa, the 90-degree peel strength is 40N/cm, and the T peel strength is 320N/100mm, so that the network structure meets the transformation development requirements of the automobile industry.
Drawings
FIG. 1 is a schematic diagram of a medium-temperature-curing high-toughness epoxy adhesive used for bonding aviation aluminum shear sheets.
Fig. 2 is a schematic diagram of the bonding of a medium-temperature-curing high-toughness epoxy adhesive for a honeycomb sandwich structure.
FIG. 3 is a schematic diagram of the use of a medium-temperature-curing high-toughness epoxy adhesive for bonding a carbon fiber composite material.
Detailed Description
The action mechanism of the raw materials in the formula of the invention is as follows:
polyether polyol is selected as a soft segment, and diisocyanate is selected as a hard segment to prepare the isocyanate-terminated prepolymer. Capping the prepolymer by using gamma-aminopropyltriethoxysilane (KH550) to obtain a precursor of the silicon-ethoxy-capped hybrid polyurethane elastomer; adding gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane (KH560) and synthesizing the siloxane hybrid polyurethane elastomer with the active epoxy groups by utilizing the hydrolytic condensation reaction of silicon ethoxy.
The elastomer is in a silicon-oxygen-silicon three-dimensional network structure, is compounded with epoxy resin for use, can form an interpenetrating network structure during curing, and the winding interlocking structure can strengthen the interaction of phase interfaces.
In the formula selection of the invention, the addition amount of the siloxane hybrid polyurethane elastomer toughening agent is reasonably controlled to be 20-40% of the resin dosage. Otherwise, when the using amount is too low, a winding interlocking structure is difficult to form inside the adhesive to realize the rapid energy transfer and dissipation; when used in too high an amount, the low glass transition temperature silicone hybrid polyurethane elastomer toughener can instead result in a decrease in the mechanical properties of the adhesive.
In order to further understand the invention, the preparation method of the medium-temperature curing high-toughness epoxy adhesive provided by the invention is combined with the comparative example and the embodiment, and the bonding effect of the epoxy adhesive on the aviation aluminum material is analyzed by comparing the room-temperature tensile shear strength, the 90-degree peel effect, the T-type peel strength and the T-type peel effect. The scope of the present invention is not limited by the following examples.
Example 1:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 5 parts of siloxane hybrid polyurethane elastomer, 10 parts of talcum powder, 60 parts of silicon micropowder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component A.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
Example 2:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 10 parts of siloxane hybrid polyurethane elastomer, 10 parts of talcum powder, 55 parts of silicon micropowder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component A.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
Example 3:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 20 parts of siloxane hybrid polyurethane elastomer, 10 parts of talcum powder, 45 parts of silica powder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component A.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
Example 4:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 30 parts of siloxane hybrid polyurethane elastomer, 10 parts of talcum powder, 35 parts of silicon micropowder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component A.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
Example 5:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 40 parts of siloxane hybrid polyurethane elastomer, 10 parts of talcum powder, 25 parts of silica powder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component A.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
Example 6:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 50 parts of siloxane hybrid polyurethane elastomer, 10 parts of talcum powder, 15 parts of silica powder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component A.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
Example 7:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 60 parts of siloxane hybrid polyurethane elastomer, 10 parts of talcum powder, 5 parts of silicon micropowder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component A.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
Example 8:
1. the preparation method of the toughening agent comprises the following steps:
reacting N330100 parts, N22080 parts and TDI 30 parts at 80 ℃ to prepare an isocyanate-terminated prepolymer; 100 parts of isocyanate-terminated prepolymer, KH 55012 parts and KH 56010 parts are weighed and mixed in a reaction kettle, and then the mixture is reacted for 60 minutes under the stirring speed of 200-500 revolutions per minute to obtain the siloxane hybrid polyurethane elastomer.
2. The preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 reactive diluent, 20 parts of siloxane hybrid polyurethane elastomer, 55 parts of silica powder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and after vacuum defoaming, filtering, discharging and packaging to obtain the component A colloid.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, silicon micropowder 60 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 rpm, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the component B colloid.
Comparative example 1:
1. the preparation method of the medium-temperature curing high-toughness epoxy adhesive comprises the following steps:
1) preparing a component A: and sequentially putting 50 parts of E-51 resin, 50 parts of E-44 resin, 8 parts of 636 active diluent, 10 parts of talcum powder, 65 parts of silicon micropowder and 6 parts of hydrophobic fumed silica into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500 r/min, stirring and mixing for 2 hours, and after vacuum defoaming, filtering, discharging and packaging to obtain the component A colloid.
2) Preparing a component B: sequentially putting low-molecular-weight D020040 parts, R201820 parts, R228310 parts, JH-53285 parts, DMP-305 parts, talcum powder 30 parts, silicon micropowder 30 parts and hydrophobic fumed silica 4 parts into a planetary stirring kettle according to the proportion, controlling the rotating speed to be 200-500R/min, stirring and mixing for 2 hours, and filtering, discharging and packaging after vacuum defoaming to obtain the colloid of the component B.
The materials are respectively weighed according to the mass ratio of A to B being 1 to 1, then an aviation aluminum test piece is bonded, solidified at 70 ℃/40min, and naturally cooled to room temperature for testing.
The results of comparative experimental examples and comparative experiments can show that: the self-made siloxane hybrid polyurethane elastomer is added into the epoxy resin, and the stress transmission and dispersion in a network are realized by utilizing a winding interlocking structure formed in the curing process, so that the bonding effect of the adhesive on the lightweight material aluminum material can be obviously improved.
The results of the performance tests of the above examples and comparative examples are shown in table 1:
TABLE 1
Claims (6)
1. The intermediate-temperature-curing high-toughness epoxy adhesive for bonding the aluminum materials comprises a component A and a component B, and is characterized in that the ratio of the component A to the component B is 0.9-1.1: 1.1-0.9; wherein the content of the first and second substances,
the component A comprises the following components in parts by weight:
80-120 parts of epoxy resin;
6-20 parts of an active diluent;
20-40 parts of a toughening agent;
30-60 parts of a filler;
2-10 parts of a thixotropic agent;
the component B comprises the following components in parts by weight:
10-50 parts of a low-molecular-weight polyamide curing agent;
20-60 parts of a modified amine curing agent;
1-5 parts of an accelerator;
40-80 parts of a filler;
1-5 parts of a thixotropic agent;
the epoxy resin is any one or more of bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin and bisphenol F epoxy resin;
the reactive diluent is any one or more of 1, 4-butanediol diglycidyl ether, trihydroxymethyl triglycidyl ether and 1, 6-hexanediol diglycidyl ether;
the toughening agent is a siloxane hybrid polyurethane elastomer;
the toughening agent is prepared by the following steps:
1) reacting 100-200 parts of polyether polyol and 30-50 parts of excessive diisocyanate at 80 ℃ to prepare an isocyanate-terminated prepolymer;
2) mixing 100-150 parts of isocyanate-terminated prepolymer and 10-30 parts of silane coupling agent in a reaction kettle, reacting for 60 minutes under stirring at the speed of 200-500 rpm, and discharging to obtain siloxane hybrid polyurethane elastomer;
the silane coupling agent is a mixture of gamma-aminopropyltriethoxysilane (KH550) and gamma- (2, 3-glycidoxy) propyltrimethoxysilane (KH 560).
2. The medium-temperature-curing high-toughness epoxy adhesive for bonding the aluminum material as claimed in claim 1, wherein the low-molecular-weight polyamide curing agent is any one or more of D0200, D3200 and D811 of Shanghai Junjiang material technology Co., Ltd or YD-8225, YD-8140A, YD-8400 of Jiangxi Yichun far-reaching chemical industry Co., Ltd;
the modified amine curing agent is any one or more of JH-5408, JH-5328 and JH-5280 of R2018, R2283 and R2257 of Guangzhou Ruichi chemical engineering Co., Ltd or Jia Di Da New Material science and technology Co., Ltd of Shenzhen.
3. The medium-temperature curing high-toughness epoxy adhesive for aluminum material bonding as claimed in claim 1, wherein said accelerator is 2,4, 6-tris (dimethylaminomethyl) phenol.
4. The intermediate-temperature-curing high-toughness epoxy adhesive for bonding the aluminum material as claimed in claim 1, wherein the filler is one or more of mica powder, silica micropowder, superfine talc powder, nano calcium carbonate and glass fiber powder.
5. The medium-temperature curing high-toughness epoxy adhesive for aluminum material bonding of claim 1, wherein the thixotropic agent is hydrophobic fumed silica.
6. The method for preparing the medium-temperature curing high-toughness epoxy adhesive for bonding the aluminum material as claimed in any one of claims 1 to 5, comprising the steps of:
the preparation of the component A comprises the following steps:
sequentially adding the epoxy resin, the reactive diluent, the toughening agent, the filler and the thixotropic agent into a stirrer, stirring and mixing at 200-500 rpm, performing vacuum defoaming after mixing, and filtering and packaging to obtain the component A colloid;
the preparation step of the component B:
and adding the low-molecular-weight polyamide curing agent, the modified amine curing agent, the accelerator, the filler and the thixotropic agent into a stirrer, stirring and mixing at 200-500 r/min, performing vacuum defoaming after mixing, and filtering and packaging to obtain the component B colloid.
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| CN112778950B (en) * | 2020-12-31 | 2023-03-07 | 康达新材料(集团)股份有限公司 | Efficient intermediate-temperature fast-curing epoxy structural adhesive for die assembly and bonding of wind power generation blades and preparation method thereof |
| CN114561179A (en) * | 2022-03-09 | 2022-05-31 | 上海回天新材料有限公司 | High-temperature-resistant heat-conducting oil epoxy resin sealant and preparation method thereof |
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| 一种硅氧烷杂化聚氨酯弹性体的制备及动态力学性能;王芳等;《高分子材料科学与工程》;20100930;第26卷(第9期);第139-142页 * |
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