CN108795145B - Nano HDDA-EP system IPNS composite coating and preparation method and application thereof - Google Patents

Nano HDDA-EP system IPNS composite coating and preparation method and application thereof Download PDF

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CN108795145B
CN108795145B CN201810548312.4A CN201810548312A CN108795145B CN 108795145 B CN108795145 B CN 108795145B CN 201810548312 A CN201810548312 A CN 201810548312A CN 108795145 B CN108795145 B CN 108795145B
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silicon dioxide
hdda
nano silicon
composite coating
stirring
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CN108795145A (en
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冯佃臣
魏新
张胤
胡晓燕
张羊换
孙学贤
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Inner Mongolia University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/04—Polymer mixtures characterised by other features containing interpenetrating networks
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention relates to a nanometer HDDA-EP system IPNS composite coating and a preparation method and application thereof, the coating takes epoxy resin E44 and HDDA as main components, an HDDA-EP interpenetrating polymer network system is prepared by adding a cross-linking agent, an initiator and the like and optimizing a specific process, and then surface modified nanometer silicon dioxide modified by a coupling agent is added into the system, so that a novel nanometer HDDA-epoxy resin IPNS composite coating is prepared, the coating has surface effect, small-size effect and the like which are not possessed by macro particles due to small particle size of nanometer materials, so that the coating generates osmosis in the process of being combined with organic substances, and the mechanical strength, toughness, wear resistance, aging resistance and the like of the high polymer materials are greatly improved; moreover, by constructing an HDDA-EP interpenetrating polymer network system, the properties of the HDDA-EP interpenetrating polymer network system and the HDDA-EP interpenetrating polymer network system can be integrated.

Description

Nano HDDA-EP system IPNS composite coating and preparation method and application thereof
Technical Field
The invention relates to the technical field of steel anticorrosive coatings, in particular to a nano HDDA-EP system IPNS composite coating and a preparation method and application thereof.
Background
The corrosion of steel is always a problem which is solved by the related fields of corrosion prevention and the like, because the corrosion of steel not only brings huge economic loss, but also rust corrosion of steel is a hidden potential safety hazard in some building and mechanical parts, thus threatening the life safety of people.
The existing anticorrosive paint mainly has the following defects: (1) in the aspect of price: the price of special anticorrosive and antirust coatings in the market, particularly varnish coatings, is higher, generally about 22 yuan/kg, and the coatings prepared by the IPNS technology are relatively less; (2) because the technology of the surface modification of the nano material is not mature enough, the organic coating added by the nano material in the patent document is limited, and the application of the nano material is limited due to the rejection and limited effect of the nano material modification process; (3) there has been little research associated with the addition of modified nanomaterials to interpenetrating polymer network systems to form nano-IPNS composite coatings.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a nano HDDA-EP system IPNS composite coating, a preparation method and an application thereof, and the novel nano HDDA-epoxy resin IPNS composite coating prepared by the novel nano HDDA-EP system IPNS composite coating has surface effect, small size effect and the like which are not possessed by macro particles due to small particle size of nano materials, so that the nano HDDA-epoxy resin IPNS composite coating generates osmosis in the process of combining with organic substances, and the mechanical strength, toughness, wear resistance, ageing resistance and the like of high polymer materials are greatly improved.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides a surface-modified nano-silica, which is characterized in that the surface-modified nano-silica comprises the following raw material components by mass: 3-7% of nano silicon dioxide, 2-3% of silane coupling agent and the balance of dimethylbenzene.
Preferably, the silane coupling agent is KH-560.
The preparation method of the surface modified nano silicon dioxide comprises the following steps: s101: fully grinding the nano silicon dioxide, and then dissolving the nano silicon dioxide in dimethylbenzene; s102: under the stirring action, adding a silane coupling agent into the mixture obtained in the step S101, and then stirring for 25-35 min; s103: after stirring, carrying out reaction in a constant-temperature water bath kettle; s104: and filtering the transparent colloidal substance after the reaction is finished, and drying the product obtained by filtering to obtain the surface modified nano silicon dioxide.
Preferably, in S104, before drying the filtered product, the method further comprises the steps of: adding a drier with the mass percentage of 1.6-1.7% into a product obtained by filtering; the drier comprises DMP-30.
Preferably, in S103, the reaction temperature is 70-90 ℃, and the reaction time is 5-7 h; and S104, drying at 85-95 ℃ for 0.5-1.5 h.
In a second aspect, the present invention provides a composite coating, wherein the raw material components of the composite coating comprise: 40-45 parts of epoxy resin, 6-8 parts of filler, 16-17 parts of low molecular weight polyamide substance, 20-28 parts of organic solvent, 0.8-0.9 part of surface modified nano silicon dioxide, 0.01-0.03 part of dibenzoyl peroxide, 5.5-6.0 parts of 1, 6-hexanediol diacrylate, 0.3-0.5 part of flatting agent and 0.05-0.15 part of defoaming agent.
Preferably, the low molecular polyamide-based substance includes polyamide 650; the organic solvent comprises an ester organic solvent and an aromatic hydrocarbon solvent; the ester organic solvent comprises butyl acetate, and the aromatic hydrocarbon solvent comprises xylene; the mass ratio of the ester organic solvent to the aromatic hydrocarbon solvent is 1 (0.8-1.2). The polyamide 650 has an amine value of 200-240 mgKOH/g, is non-toxic, and is cured by volatilization of an organic solvent, contact reaction of main film-forming substances, and crosslinking and curing to form a film.
Preferably, the epoxy resin is E-44 epoxy resin and the filler is talc. In the composite coating provided by the invention, the main film-forming material comprises E-44 epoxy resin, the average epoxy value is 0.44, and the average molecular relative weight is 454.5; the secondary film-forming material comprises the filler talc.
The preparation method of the composite coating comprises the following steps: s1: mixing epoxy resin and low molecular weight polyamide substances, and then fully stirring; s2: adding 1, 6-hexanediol diacrylate (HDDA) to the mixture obtained in S1, then adding dibenzoyl peroxide, and stirring thoroughly; s3: carrying out water bath reaction on the mixture obtained in the step S2 at 55-65 ℃ for 0.8-1.2 h, then adding the surface modified nano silicon dioxide, and fully stirring; s4: and adding other residual raw material components into the mixture obtained in the step S3, and uniformly stirring to obtain the composite coating.
In the third aspect, the invention also protects the application of the surface modified nano silicon dioxide and the composite coating in preparing anticorrosive materials.
The technical scheme provided by the invention has the following beneficial effects:
(1) the preparation of the interpenetrating polymer network system coating is combined with the modified nano inorganic material, so that the full integration of the properties of the IPNS system composition and the combination of the inorganic material and the organic material are realized, and the mechanical properties of the coating, such as flexibility, impact resistance, aging resistance, ultraviolet resistance and the like, are improved;
(2) the novel composite coating provided by the invention is matched with equipment such as a spraying machine, a stirring machine and the like to realize online anticorrosion treatment of the seamless pipe, so that the coating is coated on the surface of the seamless pipe before packing and transportation off-line, the off-line treatment is avoided, the cost is saved, and the anticorrosion effect can be achieved;
(3) compared with the traditional coating, the novel coating provided by the invention has better performances of aging resistance, pulverization resistance and the like, is generated by volume effect and quantum tunnel effect of nano materials, and has the characteristics of ultraviolet ray resistance and infrared radiation resistance due to the special properties of nano silicon dioxide such as extremely strong infrared and ultraviolet reverse characteristics; the thermoplastic resin continuously penetrates through the thermosetting resin network to form an Interpenetrating Polymer Network (IPN), and the formed polymer blend has the advantages of two resins due to the forced mutual compatibility and synergistic effect among the mutually penetrated and intertwined polymers, so that the performance complementation effect is realized, the HDDA-EP system has good corrosion resistance, good mechanical properties such as strong adhesive force and enough paint film hardness, the flexibility, the impact resistance and the like are improved, and the hard and brittle paint film is avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is an infrared spectrum of a surface-modified nano-silica in accordance with a first embodiment of the present invention;
FIG. 2 is a diagram of a salt spray corrosion experiment when the amount of the surface-modified nano-silica added is 0% in example II of the present invention;
FIG. 3 is a diagram of a salt spray corrosion experiment when the amount of the surface-modified nano-silica added is 2% of the amount of the resin used in example II of the present invention;
FIG. 4 is a diagram of a salt spray corrosion experiment when the amount of the surface-modified nano-silica added is 4% of the amount of the resin used in example II of the present invention;
FIG. 5 is a diagram of a salt spray corrosion experiment when the amount of the surface-modified nano-silica added is 6% of the amount of the resin used in example II of the present invention;
FIG. 6 is a graph of electrochemical experimental results of different amounts of surface-modified nano-silica added in example II of the present invention;
FIG. 7 is an AC impedance chart of different amounts of surface-modified nano-silica added in example two of the present invention;
FIG. 8 is a fracture micro-topography map of an epoxy system coating in example two of the present invention;
FIG. 9 is a fracture micro-topography of an IPNS system coating paint film in example two of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The experimental procedures in the following examples are conventional unless otherwise specified. The test materials used in the following examples were purchased from a conventional store unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
The invention provides surface modified nano silicon dioxide, which comprises the following raw material components in percentage by mass: 3 to 7 percent of nano silicon dioxide, KH-5602 to 3 percent of silane coupling agent, 301.6 to 1.7 percent of drier DMP and the balance of dimethylbenzene.
The preparation method comprises the following steps:
s101: fully grinding the nano silicon dioxide, and then dissolving the nano silicon dioxide in dimethylbenzene;
s102: under the stirring action, adding a silane coupling agent KH-560 into the mixture obtained in the step S101, and then stirring for 25-35 min;
s103: after stirring, reacting for 5-7 h at 70-90 ℃ in a constant-temperature water bath kettle;
s104: filtering a transparent colloidal substance after the reaction is finished, and adding a drier DMP-30 into a product obtained by filtering; drying at 85-95 ℃ for 0.5-1.5 h to obtain the surface modified nano silicon dioxide.
The invention also provides a composite coating, which comprises the following raw material components: 40-45 parts of E-44 epoxy resin, 6-8 parts of talcum powder (filler), 16-17 parts of polyamide 650 (low molecular weight polyamide substance), 12 parts of butyl acetate (ester organic solvent), 12 parts of xylene (aromatic hydrocarbon solvent), 0.8-0.9 part of surface modified nano silicon dioxide, 0.01-0.03 part of dibenzoyl peroxide, 5.5-6.0 parts of 1, 6-hexanediol diacrylate (HDDA), 0.3-0.5 part of flatting agent and 0.05-0.15 part of defoaming agent.
The preparation method of the composite coating comprises the following steps:
s1: mixing E-44 epoxy resin and polyamide 650 (low molecular weight polyamide substance), and then fully stirring;
s2: adding 1, 6-hexanediol diacrylate (HDDA) to the mixture obtained in S1, then adding dibenzoyl peroxide, and stirring thoroughly;
s3: reacting the mixture obtained in the step S2 in a water bath at 55-65 ℃ for 0.8-1.2 h, adding the surface modified nano silicon dioxide, and fully stirring;
s4: and adding other residual raw material components into the mixture obtained in the step S3, and uniformly stirring to obtain the composite coating.
Example one
The embodiment provides a surface modified nano-silica, which comprises the following raw material components in percentage by mass: 4.9% of nano silicon dioxide, KH-5602.5% of silane coupling agent, DMP-301.68% of drier and the balance of dimethylbenzene.
The preparation method comprises the following steps:
s101: fully grinding the nano silicon dioxide, and then dissolving the nano silicon dioxide in dimethylbenzene;
s102: under the stirring action, adding a silane coupling agent KH-560 into the mixture obtained in the step S101, and then stirring for 30 min;
s103: after stirring, reacting for 6 hours at 80 ℃ in a constant-temperature water bath kettle;
s104: filtering a transparent colloidal substance after the reaction is finished, and adding a drier DMP-30 into a product obtained by filtering; drying for 1h at 90 ℃ to obtain the surface modified nano silicon dioxide.
The grafting rate of the surface-modified nano-silica can reach 0.067066, and a Fourier infrared spectrum analysis chart is shown in figure 1.
The modified nano SiO can be seen from the figure2The infrared spectrogram has two characteristic absorption peaks at 2850 and 2960, which respectively correspond to-CH3Radical and-CH2The stretching vibration of C-H bond in the-group appears as C ═ C stretching vibration absorption peak at 1650, while Si-O characteristic absorption peak at 1096 is sharp, which shows that the nano SiO2The hydroxyl group of (A) is reacted and obviously reduced, so that the silane coupling agent KH-560 and the nano SiO are seen2Surface hydroxyl function of nano SiO2The surface has introduced into it corresponding organic groups of the coupling agent.
Example two
The embodiment provides a composite coating, which comprises the following raw material components: 42 parts of E-44 epoxy resin, 7 parts of talcum powder (filler), 16.8 parts of polyamide 650 (low molecular weight polyamide substance), 12 parts of butyl acetate (ester organic solvent), 12 parts of xylene (aromatic hydrocarbon solvent), 0.84 part of surface modified nano-silica, 0.02 part of dibenzoyl peroxide, 5.88 parts of 1, 6-hexanediol diacrylate (HDDA), 0.4 part of leveling agent and 0.10 part of defoaming agent.
The preparation method of the composite coating comprises the following steps:
s1: mixing E-44 epoxy resin and polyamide 650 (low molecular weight polyamide substance), and then fully stirring;
s2: adding 1, 6-hexanediol diacrylate (HDDA) to the mixture obtained in S1, then adding dibenzoyl peroxide, and stirring thoroughly;
s3: reacting the mixture obtained in the step S2 in water bath at 60 ℃ for 1h, then adding the surface modified nano silicon dioxide, and fully stirring;
s4: and adding other residual raw material components into the mixture obtained in the step S3, and uniformly stirring to obtain the composite coating. The addition amount of the surface modified nano silica is visually reflected by a salt spray corrosion experiment, four variable groups are set for the addition amount of the surface modified nano silica, namely the addition amount of the surface modified nano silica is respectively 0%, 2%, 4% and 6% of the resin amount, and after continuous spraying in a continuous salt spray box for one week, the conditions of each sample piece are respectively shown in fig. 2 (0%), fig. 3 (2%), fig. 4 (4%) and fig. 5 (6%). As can be seen from the pictures, the corrosion of 0% of the samples is most severe, the peeling and foaming phenomena of different degrees appear in 4% and 6% of the samples, the 2% of the samples have no too much corrosion on the whole, and the corrosion basically extends along the scratch direction and the edge part.
The influence of the addition amount of the surface modified nano material is further verified from data through an electrochemical experiment, and the result is shown in fig. 6; wherein 1 represents the polarization curve of a sample with the nano material addition amount of 2 percent, and 2 represents the polarization curve of a sample with the nano material addition amount of 0 percent, so that the self-corrosion potential of the paint film is effectively improved by adding the nano material, and the self-corrosion current density of the paint film is also reduced, namely the corrosion resistance is improved to some extent.
In FIG. 7, 1 represents the AC impedance diagram of the sample with 2% of the added amount of the nanomaterial, and 2 represents the AC impedance diagram of the sample with 0% of the added amount of the nanomaterial, and it can be seen that the arc of 1 is significantly larger than 2, that is, after the nanomaterial is added, the resistance of the paint film during corrosion is large, and the corrosion resistance is also strong.
Fracture micro-topography observations of epoxy system coatings and IPNS system coating films are shown in FIGS. 8 and 9; wherein FIG. 8 shows an epoxy system coating and FIG. 9 shows an IPNS system coating. It can be seen from the figure that the pure epoxy-based coating has the defects of over-high hardness and poor toughness, the fracture is neat and flat and is a typical brittle fracture form, the novel composite coating obtained by constructing an interpenetrating polymer network system through EP and HDDA has the advantages that the toughness is obviously improved, the fracture is in a form similar to a dimple, and the fracture is in a ductile fracture state, so that the impact resistance of the composite coating is improved.
The properties of the above-described coating compositions were determined experimentally as shown in table 1 below.
TABLE 1 composite coating Properties
Figure RE-GDA0002951980690000081
The method comprises the steps of establishing an IPNS system, determining the types of an initiator, a cross-linking agent and the like and the dosage, proportion and the like of system components by methods such as an orthogonal experiment, a single-factor experiment and the like, and determining the macroscopic and microscopic characteristics of the system by experiments such as a mechanical property experiment, a salt spray corrosion experiment, an infrared spectrum experiment, an SEM (scanning electron microscope) experiment and the like; the determination of the surface modification and the good or bad modification effect in the process of adding the nano silicon dioxide, the determination of the dosage of the nano material and the modification process, so as to prepare the novel composite coating, evaluate the comprehensive properties of the coating, and carry out micro-adjustment on the components, thereby finally obtaining the composite coating provided by the invention.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains. Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. In all examples shown and described herein, unless otherwise specified, any particular value should be construed as merely illustrative, and not restrictive, and thus other examples of example embodiments may have different values.
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention, and all of the technical solutions are covered in the protective scope of the present invention.

Claims (2)

1. The composite coating is characterized by comprising the following raw material components: 40-45 parts of epoxy resin, 6-8 parts of filler, 16-17 parts of low molecular weight polyamide substance, 20-28 parts of organic solvent, 0.8-0.9 part of surface modified nano silicon dioxide, 0.01-0.03 part of dibenzoyl peroxide, 5.5-6.0 parts of 1, 6-hexanediol diacrylate, 0.3-0.5 part of flatting agent and 0.05-0.15 part of defoaming agent;
the surface modified nano silicon dioxide comprises the following raw material components in percentage by mass: 3-7% of nano silicon dioxide, 2-3% of silane coupling agent, 1.6-1.7% of drier and the balance of dimethylbenzene; the silane coupling agent is KH-560;
the preparation method of the surface modified nano silicon dioxide comprises the following steps: s101: fully grinding the nano silicon dioxide, and then dissolving the nano silicon dioxide in dimethylbenzene; s102: under the stirring action, adding a silane coupling agent into the mixture obtained in the step S101, and then stirring for 25-35 min; s103: after stirring, carrying out reaction in a constant-temperature water bath kettle; s104: filtering the transparent colloidal substance after the reaction is finished, and drying the product obtained by filtering to obtain the surface modified nano silicon dioxide;
in S104, before drying the filtered product, the method further includes: adding a drier into a product obtained by filtering; the drier is DMP-30;
in S103, the reaction temperature is 70-90 ℃, and the reaction time is 5-7 h;
s104, drying at 85-95 ℃ for 0.5-1.5 h;
the low molecular weight polyamide substance is polyamide 650; the organic solvent is an ester organic solvent and an aromatic hydrocarbon solvent; the ester organic solvent is butyl acetate, and the aromatic hydrocarbon solvent is xylene; the mass ratio of the ester organic solvent to the aromatic hydrocarbon solvent is 1 (0.8-1.2); the epoxy resin is E-44 epoxy resin, and the filler is talcum powder;
the preparation method of the composite coating comprises the following steps:
s1: mixing epoxy resin and low molecular weight polyamide substances, and then fully stirring;
s2: adding 1, 6-hexanediol diacrylate into the mixture obtained in S1, then adding dibenzoyl peroxide, and fully stirring;
s3: reacting the mixture obtained in the step S2 at 55-65 ℃ for 0.8-1.2 h, then adding the surface modified nano silicon dioxide, and fully stirring;
s4: and adding other residual raw material components into the mixture obtained in the step S3, and uniformly stirring to obtain the composite coating.
2. Use of the composite coating according to claim 1 for the preparation of an anticorrosive material.
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Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"UV-Cured Interpenetrating Acrylic-Epoxy Polymer Networks: Preparation and Characterization";Marco Sangermano,et al;《Macromol. Mater. Eng.》;20080616;第293卷(第6期);第515-520页 *
"二氧化硅改性环氧树脂杂化涂料的制备与性能表征";李为立等;《江苏科学大学学报（自然科学版）》;20101031;第24卷(第5期);第446-450页 *
"硅烷偶联剂KH-560改性纳米二氧化硅";刘会媛等;《化学世界》;20110831(第8期);第456-458、458页 *

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