CN115124694B - Hydroxyl organic silicon modified epoxy resin and magnesium-rich primer prepared from same - Google Patents
Hydroxyl organic silicon modified epoxy resin and magnesium-rich primer prepared from same Download PDFInfo
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- CN115124694B CN115124694B CN202110311927.7A CN202110311927A CN115124694B CN 115124694 B CN115124694 B CN 115124694B CN 202110311927 A CN202110311927 A CN 202110311927A CN 115124694 B CN115124694 B CN 115124694B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/14—Polycondensates modified by chemical after-treatment
- C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
- C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- 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
- C09D5/10—Anti-corrosive paints containing metal dust
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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
Abstract
The invention discloses a method for modifying epoxy resin by hydroxyl organic silicon, and the modified resin obtained by the method has high toughness and strength and good compatibility with inorganic magnesium powder. The invention also discloses a hydroxyl organic silicon modified epoxy-magnesium-rich primer and a preparation method thereof, wherein the hydroxyl organic silicon modified epoxy-magnesium-rich primer overall system comprises a main agent and a curing agent; the main agent comprises: magnesium powder, hydroxyl organic silicon modified epoxy resin, an anti-settling agent and a solvent. The hydroxyl organic silicon modified epoxy-magnesium-rich primer can provide effective sacrificial anode protection for aluminum alloy base materials, and is environment-friendly and efficient.
Description
Technical Field
The invention relates to the field of anticorrosive paint, in particular to hydroxyl organic silicon modified epoxy resin and a magnesium-rich primer prepared from the same.
Background
Aluminum alloy is light in weight, easy to process and high in strength, and is widely applied to industries such as aviation, aerospace, high-speed trains, automobiles and ships. To reduce fuel consumption and carbon emissions, metallic materials such as aluminum alloys, which are stronger than the others, continue to find increasing use in various fields.
However, the aluminum alloy is easy to generate galvanic corrosion due to the addition of alloy elements, and the chromate treatment technology which is effective for protecting the aluminum alloy in the past is limited to be used because of being toxic to human bodies and harmful to the environment. Therefore, research and development of an environment-friendly, efficient and easy-to-operate aluminum alloy protection product replacing a chromate treatment technology is very necessary. Epoxy-magnesium rich coatings are an alternative technique, and magnesium rich primers can provide effective cathodic protection of aluminum alloys, similar to the zinc rich primer protection mechanism for steel structures.
The epoxy resin has excellent corrosion resistance, but the defects of brittleness, stress cracking and poor impact resistance after curing generally exist due to the characteristic of a crosslinked network structure, and the high specific area and high oil absorption of the magnesium powder are easy to increase the adverse factors, and meanwhile, the adhesive force of the coating is influenced, so that the corrosion resistance of the epoxy resin is reduced. The organosilicon product has good flexibility and elasticity, and has good compatibility with high oil absorption pigment, especially the hydroxyl group contained in hydroxyl organosilicon can increase the strength of a coating film in the curing process, and the impact resistance and the adhesive force of epoxy resin are effectively improved. Therefore, the modified epoxy resin is often used as a modifier of the epoxy resin to improve the resin performance, thereby meeting the requirement of high performance of the resin material.
Disclosure of Invention
The invention mainly solves the technical problem of providing a method for modifying epoxy resin by hydroxyl organic silicon and a magnesium-rich primer prepared by using high-performance modified resin for aluminum alloy protection.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the preparation method of hydroxyl organic silicon modified epoxy resin comprises the steps of mixing epoxy resin, hydroxyl organic silicon and an organic tin catalyst, introducing nitrogen under the condition of stirring, heating to 155-160 ℃, boiling the system, reacting at a constant temperature until no water drops are generated in the system, and cooling to room temperature to obtain a modified product; wherein the dosage ratio among the epoxy resin, the hydroxyl organic silicon and the organic tin catalyst is 3:1:0.03-5:1:0.1 (mass ratio).
The epoxy resin is an epoxy resin with medium molecular weight (relative molecular weight 400-1400); preferably, the medium molecular weight epoxy resin is bisphenol A type epoxy resin and/or bisphenol F type epoxy resin, wherein the bisphenol A type epoxy resin can be E-20 or E-12; more preferably, the epoxy resin is bisphenol A type epoxy resin (E-20) having an epoxy value of 0.20.
The hydroxyl organosilicon is organosilicon compound containing at least two or more hydroxyl groups, preferably terminal dihydroxy organosilicon, and is typically dihydroxy silicone oil with a molecular formula shown in formula 1, m=1-3;
the organotin catalyst is dibutyltin dilaurate.
The epoxy resin is dissolved to 50-75% of solid content by an organic solvent for standby; wherein the organic solvent is xylene and/or ethyl acetate/acetone, and the volume ratio is preferably 1:1, a mixed solvent of xylene and ethyl acetate;
the epoxy resin is dissolved to 50-75% of solid content by an organic solvent, then a catalyst dibutyl tin dilaurate accounting for 0.75-1.67% of reactants (epoxy resin and hydroxyl organic silicon) in the system is added, the mixture is added into a refueling water separator under the stirring condition, nitrogen is introduced, the system is boiled when the temperature is raised to 155-160 ℃, the constant temperature reaction is carried out until no water drops are generated in the system, and the temperature is lowered to the room temperature to obtain a modified product.
Further, adding a certain amount of epoxy resin, hydroxyl organic silicon and organic tin catalyst into a four-neck flask with a stirrer, a condensation and reflux oil-water separator and a temperature control device at one time, stirring and controlling the rotating speed to be about 500rmp, introducing nitrogen, heating to 155-160 ℃, boiling the system, reacting at a constant temperature until no water drops are generated in the oil-water separator (about 5 h), and cooling to room temperature for discharging to obtain a modified product.
The hydroxyl organic silicon modified epoxy resin obtained by the preparation method is prepared according to the preparation method.
A magnesium-rich primer, a main agent and a curing agent:
the magnesium-rich primer consists of a main agent and a curing agent according to the mass ratio of 10: 7-10: 4, mixing to obtain;
wherein, the main agent is magnesium powder according to weight percent: 30% -60% of modified epoxy resin prepared by the method of claim 1: 10% -40%, solvent: 10% -35%, anti-settling agent: 1% -4%;
preferably, the composite coating consists of a main agent and a curing agent according to the mass ratio of 10:5, mixing to obtain;
wherein, the main agent is magnesium powder according to weight percent: 45% -50% of modified epoxy resin: 20% -30%, solvent: 25% -30%, anti-settling agent: 2 to 2.5 percent.
The solvent is one or a mixture of more of aromatic hydrocarbon, alcohol, ketone or ester;
the anti-settling agent is one or a mixture of more of fumed silica, bentonite and cellulose ether; preferably fumed silica and bentonite mixed anti-settling agent; preferably, the anti-settling agent is prepared from the following components in percentage by mass: 1 and bentonite.
The curing agent is one or more of aliphatic polyamine, aromatic polyamine, alicyclic polyamine, polyamide polyamine or modified polyamine. Preferably polyamide polyamines.
The magnesium powder is prepared by crushing solid magnesium, and then sequentially carrying out surface treatment on the crushed solid magnesium by using dimethylbenzene and a silane coupling agent for later use. The fineness of the magnesium powder is 150-400 meshes; preferably 200 mesh magnesium powder.
The magnesium powder surface treatment comprises the following steps: immersing the crushed magnesium powder in dimethylbenzene for full soaking; filtering to remove dimethylbenzene, adding 1/4-1/2 of silane coupling agent into magnesium powder, and oscillating to fully mix; placing the mixture of magnesium powder and silane coupling agent for 2-12h, and centrifuging to collect magnesium powder; the silane coupling agent is an epoxy silane coupling agent.
The soaking time of the magnesium powder in the dimethylbenzene is not less than 2 hours; centrifuging to remove the redundant silane coupling agent, wherein the rotating speed of a centrifuge is not lower than 4000 rpm;
the silane coupling agent is one or more of an amino silane coupling agent, an epoxy silane coupling agent and a vinyl silane coupling agent; the aminosilane coupling agent is KH550 or KH602, the epoxy silane coupling agent is KH560, and the vinyl silane coupling agent is KH151 or KH171; preferably epoxy silane coupling agent KH560 (gamma-glycidoxypropyl trimethoxy silane), and the label adopts domestic unified mark.
The volume ratio of the curing agent is 1:1 to 40-80 percent of solid content, more preferably to 50-70 percent of solid content.
Sequentially adding a solvent and an anti-settling agent into the hydroxyl organosilicon modified epoxy resin, pre-dispersing for 2-3 minutes at the rotating speed of 1000-1200 r/min, then adding magnesium powder after surface treatment, and re-dispersing for 20-30 minutes at the rotating speed of 3000-3500 r/min to obtain a hydroxyl organosilicon modified epoxy-magnesium-rich primer main agent;
mixing the obtained magnesium-rich primer main agent with the diluted curing agent according to the proportion to obtain the hydroxyl organosilicon modified epoxy-magnesium-rich primer coating.
Compared with the prior art, the invention has the following advantages:
compared with the prior art, the modified synthesis process is simple, the controllable window is wide, the hydroxyl content in the synthesized modified resin molecular chain is ensured not to change through the proportioning design, the high-performance polyamide curing agent (the epoxy resin commonly used curing agent) can still be selected and used without researching the curing process again, and the use is simple. The magnesium-rich primer is prepared by using the obtained hydroxyl organosilicon modified resin, the problem of poor dispersion stability of magnesium powder with high specific surface area and high oil absorption in an epoxy resin system is solved by introducing the organosilicon chain segment with low surface energy in the modified resin, and the adverse effect of magnesium powder addition on the adhesive force of a coating is eliminated; the potential of magnesium powder in the magnesium-rich primer is lower than that of aluminum alloy, and the magnesium-rich primer can provide effective sacrificial anode protection for aluminum alloy base materials similar to the protection mechanism of zinc-rich primer on steel structures, is used as a coating protection technology, is convenient to apply, has low cost, and can effectively replace a high-pollution chromate treatment technology.
Drawings
Fig. 1 is a process diagram of preparing a modified resin according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below in connection with the detailed description.
Example 1
The process method of the hydroxyl organic silicon modified epoxy resin comprises the following steps:
diluting the solid E-20 epoxy resin to 70% solid content with a mixed solvent of xylene and ethyl acetate (volume ratio 1:1); 120g E-20 solution (70% solid content), 28g of dihydroxyl organosilicon (industrial grade, zaoyang Jinpeng chemical industry) and 0.9g of catalyst dibutyltin dilaurate (about 0.8% of the mass ratio of the reaction substances) are added into a four-neck flask with a stirrer, a condensation and reflux oil-water separator and a temperature control device at one time, the mass ratio of E-20 to dihydroxyl organosilicon in the system is 3:1, the stirring control speed is about 500rmp, nitrogen is introduced, the system boils when the temperature is raised to 155-160 ℃, water drops are not generated in the oil-water separator after the constant temperature reaction (about 5 h), and the mixture is cooled to room temperature and discharged, so that a modified product is obtained.
Example 2
The process method of the hydroxyl organic silicon modified epoxy resin comprises the following steps:
diluting the solid E-20 epoxy resin to 70% solid content with a mixed solvent of xylene and ethyl acetate (volume ratio 1:1); 120g E-20 (70% solid content), 21g hydroxyl organic silicon (industrial grade, jujube sun Jinpeng chemical industry) and 1.1g catalyst dibutyl tin dilaurate (about 1% of reactant mass ratio) are added into a four-neck flask with a stirrer, a condensing and reflux oil-water separator and a temperature control device, the mass ratio of E-20 to hydroxyl organic silicon in the system is 4:1, the stirring control rotation speed is about 500rmp, nitrogen is introduced, the system boils when the temperature is raised to 155-160 ℃, water drops are not generated in the oil-water separator at constant temperature (about 4.5 h), and the mixture is cooled to room temperature and discharged to obtain a modified product.
Example 3
The process method of the hydroxyl organic silicon modified epoxy resin comprises the following steps:
diluting the solid E-20 epoxy resin to 70% solid content with a mixed solvent of xylene and ethyl acetate (volume ratio 1:1); in a four-neck flask with a stirrer, a condensing and refluxing oil-water separator and a temperature control device, 115. 115g E-20 (70% solid content), 16.1g of hydroxyl organic silicon (industrial grade, zaoyang Jinpeng chemical industry) and 1.5g of catalyst dibutyl tin dilaurate (about 1.5% of the mass ratio of the reaction substances) are added at one time, at the moment, the mass ratio of E-20 to hydroxyl organic silicon in the system is 5:1, the stirring control speed is about 500rmp, nitrogen is introduced, the system boils when the temperature is raised to 155-160 ℃, no water drops are generated in the oil-water separator after the constant temperature reaction (about 4 h), and the mixture is cooled to room temperature and discharged, thus obtaining the modified product.
Example 4
The process method of the hydroxyl organic silicon modified epoxy resin comprises the following steps:
according to the preparation method of example 2, the following modified products A-D are obtained by referring to the proportion of the table 1, fixing the mass percentage of the catalyst dibutyl tin dilaurate of the invention to the reactants to be 1%, changing the mass ratio of E-20 epoxy resin (the mixed solvent of xylene and ethyl acetate with the volume ratio of 1:1 is diluted to 70% solid content) and dihydroxyorganosilicon (industrial grade, zaoyang Jinpeng chemical industry) in a reaction system, and performing performance evaluation on each modified product.
Table 1 modified products obtained from different reactant ratios and performance evaluation thereof
From examples 1-3 and Table 1 above, it can be seen that:
(1) About 1 percent (accounting for the total mass of the system) of dibutyltin dilaurate catalyst needs to be added into the reaction system to improve the reaction activity;
(2) The proper ratio of the E-20 to the dihydroxyl organic silicon is 5:1 (mass ratio), and the obtained modified resin sample is milky white and a uniform viscous system, and only slightly delaminates after being placed for 120 days, so that the modified resin sample has good stability.
Example 5
The preparation method of the dihydroxy organosilicon modified epoxy-magnesium-rich primer comprises the following steps:
(1) Firstly, 100g of metal magnesium powder (200 meshes) is soaked with enough dimethylbenzene to ensure that the dimethylbenzene completely bypasses the magnesium powder. Filtering to remove excessive dimethylbenzene after 2 hours, adding 25g KH560 silane coupling agent, fully oscillating and mixing to fully infiltrate the surface of magnesium powder, standing for 12 hours, and centrifuging (4000 rmp,30 min) to remove excessive KH560;
(2) 3.3g of fumed silica and 1.1g of bentonite are sequentially added into 60g of hydroxyl organic silicon modified resin (the product of dihydroxyorganic silicon obtained in example 4 and E-20 with the proportion of 5:1, 75% solid content), simultaneously 60g of mixed solvent of dimethylbenzene and ethyl acetate (volume ratio of 1:1) are added, pre-dispersed for 2-3min at the rotating speed of 1000rmp, 100g of magnesium powder (200 meshes) with surface treatment obtained in the step (1) are added, the stirring rotating speed of 3000rmp is controlled, the mixture is dispersed for 20min by a high-speed dispersing machine to obtain the main agent of the composite coating,
and diluting the polyamide curing agent (Ancamide 221) to 50% by using a mixed solvent of dimethylbenzene and ethyl acetate (volume ratio is 1:1), mixing the obtained main agent with the diluted curing agent according to the mass ratio of 4:1 when in use, stirring uniformly, and spraying to obtain the composite coating.
The volume concentration (PVC%) of magnesium powder in the coating after the formula system is dried and solidified is about 60%, the coating is dried for 8 hours, the surface is smooth, compact and has slight luster, the adhesive force is 0 level by a cross-cut method, the pencil hardness is 3H, the impact resistance is 45cm (500 g), the flexibility is 3mm, after 3000 hours of a neutral salt spray experiment, the surface of the coating is bubbling sporadically, and after 3000 hours of accelerated aging of a xenon lamp, the surface of the coating is provided with sporadic spots.
Example 6
The preparation method of the dihydroxy organosilicon modified epoxy-magnesium-rich primer comprises the following steps:
according to the preparation process of the primer of the above example 5, referring to the ratio between the resin and the dihydroxy organosilicon in the dihydroxy organosilicon modified resin described in table 2, and preparing the modified resin according to the preparation process of example 2, the main agent in the preparation formula of the primer is used in mass percent; 45% of magnesium powder (200 meshes), 2% of anti-settling agent (mass ratio of fumed silica to bentonite is 3:1), 20% of modified resin, 33% of mixed solvent of xylene and ethyl acetate (volume ratio is 1:1), and 4% of modified resin obtained by changing the ratio of different reactants and the diluted curing agent described in the above example 5:1 (mass ratio) to obtain the following magnesium-rich primer A-D, and evaluating the performance of each magnesium-rich primer.
Table 2 magnesium-rich primer obtained from different modified resins and performance evaluation thereof
As can be seen from table 2 above:
(1) The magnesium-rich primer prepared from the dihydroxy organosilicon modified epoxy resin has excellent adhesive force (grade 0) and excessive flexibility (less than 4 mm);
(2) The proper ratio of E-20 to dihydroxyl organosilicon is 5:1 (mass ratio), and the magnesium-rich primer prepared by the modified resin obtained by the ratio has excellent salt spray resistance and ageing resistance index performance.
Example 7
The preparation method of the dihydroxy organosilicon modified epoxy-magnesium-rich primer comprises the following steps:
according to the preparation process of the primer of the above example 5, a modified resin was prepared according to the preparation process of example 2, namely, the modified resin of example 6 was prepared according to the preparation process of example 2, referring to the ratio of resin to dihydroxysilicone in the dihydroxysilicone modified resin described in Table 3 (E-20: dihydroxysilicone) of 5:1, and the other components and ratios of the base coat in the preparation of the primer were formulated as described in Table 3 to obtain the following coating base coat compositions E to L, and further, the base coat composition was prepared according to 4 with the diluted curing agent described in example 5:1 (mass ratio) and then evaluating the properties of the respective coatings.
Table 3 different formulation systems of modified epoxy resin-magnesium rich primer and performance evaluation thereof
As can be seen from table 3 above:
(1) The components of the anti-settling agent are important influencing factors for influencing the hard precipitation or soft precipitation of the composite coating, and the performance evaluation of the coating proves that the optimal anti-settling agent combination of the composite coating is fumed silica and bentonite, and the optimal dosage is 1.5 percent of fumed silica and 0.5 percent of bentonite;
(2) The modified epoxy resin-magnesium-rich primer is cured at room temperature in a proper curing and drying mode, and the salt spray resistance and the ageing resistance of the coating are reduced due to baking and curing;
(3) The proper adding amount of the magnesium powder (200 meshes) in the organosilicon modified epoxy-magnesium-rich primer main agent system is 45-50% (mass percent).
In conclusion, the flexibility and strength of the resin are improved through the dihydroxy organosilicon modified epoxy resin, the tolerance of the resin to magnesium powder is improved, and adverse factors such as reduced coating adhesion caused by adding of the magnesium powder, embrittled coating and the like are reduced; meanwhile, the silane coupling agent is used for carrying out surface pretreatment on the magnesium powder to further improve the compatibility problem of the magnesium powder and the modified epoxy resin; the dispersion stability problem of magnesium powder in the modified epoxy resin is solved by selecting a plurality of stabilizers for cooperation; the critical volume concentration (CPVC) of the magnesium powder in the modified epoxy resin is determined, and experimental and theoretical basis is provided for the application of inorganic magnesium powder materials and other materials in heavy anti-corrosion coatings.
The modified epoxy-magnesium-rich primer can be used for protecting aluminum alloy, can provide effective protection for aluminum alloy base materials, particularly, the potential of magnesium powder in the coating is lower than that of aluminum alloy, and can provide effective cathodic protection for base metal as a sacrificial anode. The coating of the present invention can replace the toxic and highly contaminated chromate treatment technology which is forbidden at present to provide effective protection for aluminum alloy.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (8)
1. A magnesium-rich primer, characterized by: the magnesium-rich primer consists of a main agent and a curing agent according to the mass ratio of 10: 7-10: 4, mixing to obtain;
wherein, the main agent is magnesium powder according to weight percent: 45% -50% of hydroxyl organic silicon modified epoxy resin: 10% -40%, solvent: 10% -35%, anti-settling agent: 1% -4%; the sum of the weight percentages of the components is 100 percent
The solvent is one or a mixture of more of aromatic hydrocarbon, alcohol, ketone or ester;
the anti-settling agent is a mixture of fumed silica and bentonite;
the curing agent is one or more of aliphatic polyamine, aromatic polyamine, alicyclic polyamine, polyamide polyamine or modified polyamine;
the preparation method of the hydroxyl organic silicon modified epoxy resin comprises the following steps: mixing epoxy resin, hydroxyl organic silicon and an organic tin catalyst under the stirring condition, introducing nitrogen, heating to 155-160 ℃, boiling the system, reacting at a constant temperature until no water drops are generated in the system, and cooling to room temperature to obtain a modified product; wherein, the dosage of the organotin catalyst is 1% of the mass of the reactants, and the mass ratio of the epoxy resin to the hydroxyl organosilicon is 5:1;
the hydroxyl organosilicon is an organosilicon compound containing two hydroxyl groups.
2. The magnesium-rich primer of claim 1, wherein: the magnesium powder is prepared by crushing solid magnesium and then sequentially carrying out surface treatment by using dimethylbenzene and a silane coupling agent.
3. The magnesium-rich primer of claim 2, wherein: the magnesium powder surface treatment comprises the following steps: immersing the crushed magnesium powder in dimethylbenzene for full soaking; filtering to remove dimethylbenzene, adding 1/4-1/2 of silane coupling agent into magnesium powder, and oscillating to fully mix; placing the mixture of magnesium powder and silane coupling agent for 2-12h, and centrifuging to collect magnesium powder; the silane coupling agent is an epoxy silane coupling agent.
4. The magnesium-rich primer of claim 1, wherein: the volume ratio of the curing agent is 1:1, and diluting the mixed solvent of the dimethylbenzene and the ethyl acetate to 40-80% of solid content.
5. The magnesium-rich primer according to any one of claims 1-4, wherein: sequentially adding a solvent and an anti-settling agent into the hydroxyl organic silicon modified epoxy resin, pre-dispersing for 2-3 minutes at the rotating speed of 1000-1200 r/min, then adding magnesium powder, and re-dispersing for 20-30 minutes at the rotating speed of 3000-3500 r/min to obtain a hydroxyl organic silicon modified epoxy-magnesium-rich primer main agent;
the magnesium-rich primer main agent and the curing agent are prepared according to the mass ratio of 10: 7-10: and 4, mixing the materials in proportion to obtain the magnesium-rich primer.
6. The magnesium-rich primer of claim 1, wherein: the relative molecular weight of the epoxy resin is 400-1400; the organotin catalyst is dibutyltin dilaurate.
7. The magnesium-rich primer of claim 1, wherein: the epoxy resin is dissolved to 50-75% of solid content by an organic solvent for standby; wherein the organic solvent is xylene and/or ethyl acetate and/or acetone.
8. The magnesium-rich primer according to claim 7, wherein: the mixture is added to an oil-water separator.
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