阅读说明：本技术 超强磁性涂料及其制备方法 (Super-strong magnetic paint and preparation method thereof ) 是由 黄双武 王军鹏 况金权 于 2019-09-19 设计创作，主要内容包括：本发明涉及涂料领域,公开了一种超强磁性涂料及其制备方法,该涂料包括以下重量份数的原料：成膜树脂30～50份、永磁粉50～450份、稀释剂30～50份、消泡剂1～3份、偶联剂3～5份及增韧剂3～10份。其制备方法包括以下步骤：对永磁粉进行充磁操作；对永磁粉、稀释剂、消泡剂、偶联剂、增韧剂及部分用量的成膜树脂进行第一次搅拌操作,以使各原料混合均匀,得到混合液；对混合液及剩余用量的成膜树脂进行第二次搅拌操作,以使各原料混合均匀,得到超强磁性涂料。本涂料的磁粉含量更高且磁吸性能更强,不仅可以吸住磁铁等硬磁材料,而且可以吸住铁、钴、镍等等软磁材料,大大拓宽了磁性涂料的应用范围。(The invention relates to the field of coatings, and discloses a super-strong magnetic coating and a preparation method thereof, wherein the coating comprises the following raw materials in parts by weight: 30-50 parts of film forming resin, 50-450 parts of permanent magnetic powder, 30-50 parts of diluent, 1-3 parts of defoaming agent, 3-5 parts of coupling agent and 3-10 parts of toughening agent. The preparation method comprises the following steps: magnetizing the permanent magnetic powder; stirring the permanent magnetic powder, the diluent, the defoaming agent, the coupling agent, the toughening agent and a part of the film-forming resin for the first time to uniformly mix the raw materials to obtain a mixed solution; and carrying out secondary stirring operation on the mixed solution and the residual amount of the film-forming resin so as to uniformly mix the raw materials to obtain the super-strong magnetic coating. The coating has higher magnetic powder content and stronger magnetic attraction performance, not only can attract hard magnetic materials such as magnets, but also can attract soft magnetic materials such as iron, cobalt, nickel and the like, and the application range of the magnetic coating is greatly expanded.)

1. The super-strong magnetic coating is characterized by comprising the following raw materials in parts by weight:

30-50 parts of film forming resin, 50-450 parts of permanent magnetic powder, 30-50 parts of diluent, 1-3 parts of defoaming agent, 3-5 parts of coupling agent and 3-10 parts of toughening agent.

2. The super-magnetic paint according to claim 1, wherein the film-forming resin is at least one of epoxy resin, polyurethane resin, phenolic resin, acrylic resin and silicone resin.

3. The super-magnetic coating of claim 1, wherein the permanent magnet powder is at least one of neodymium iron boron permanent magnet powder, samarium cobalt permanent magnet powder, alnico permanent magnet powder and ferrite permanent magnet powder.

4. The super-magnetic paint according to claim 1, wherein the diluent is at least one of acetone, ethanol, xylene, and ethyl acetate.

5. The super-magnetic coating material of claim 1, wherein the defoaming agent is an alcohol defoaming agent, a phosphoric acid defoaming agent or an amine defoaming agent.

6. The super-magnetic paint according to claim 1, wherein the coupling agent is a silane coupling agent or a titanate coupling agent.

7. The super-magnetic coating according to claim 1, wherein the toughening agent is at least one of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose and polyvinyl alcohol.

8. A preparation method of super-strong magnetic paint is characterized by comprising the following steps:

magnetizing the permanent magnetic powder;

carrying out primary stirring operation on the permanent magnetic powder, the diluent, the defoaming agent, the coupling agent, the toughening agent and part of the film-forming resin to uniformly mix the raw materials to obtain a mixed solution;

and carrying out secondary stirring operation on the mixed solution and the residual amount of the film-forming resin so as to uniformly mix the raw materials to obtain the super-strong magnetic coating.

9. The method for preparing super-magnetic paint according to claim 8, wherein the first stirring operation is sealed stirring at 1500-2000 rpm for 2-6 h by using a high-speed shearing machine.

10. The method for preparing a super-magnetic coating according to claim 8, wherein the second stirring operation is performed by hermetically stirring for 2 to 6 hours at a speed of 3000 to 4000 rpm using a high-speed shearing machine.

Technical Field

The invention relates to the field of coatings, in particular to a super-strong magnetic coating and a preparation method thereof.

Background

The magnetic paint is a paint containing magnetic raw materials and can be adsorbed by magnetic substances. All standard magnetic substances can be adsorbed on the magnetic paint. The magnetic functional paint can greatly facilitate the life of people, can be used as primer in painting and matched with colorful finish paint, increases the indoor style, and builds a functional wall with functions and aesthetic feeling. Meanwhile, the surface of the magnetic coating can adsorb the magnet, which is helpful for exerting the endless imagination of people, develops a decorative surface with individual style, and can be widely applied to various occasions such as children rooms, offices, kitchens, study rooms and the like. The magnetic paint is popular among people in recent years due to the concepts of rich functions, customization, environmental protection, no pollution, high decorative performance, convenient construction and the like.

Chinese patent 201710522705.3 discloses a coating with magnetomotive function, which is composed of 5-10% of nano black magnetic powder, 5-10% of nano titanium dioxide, 20-30% of water-based epoxy resin, 0.5-1% of carbon black, 3-8% of organic bentonite, 1-5% of defoaming agent, 1-3% of thickening agent and water. The paint provided by the patent application technology is water-based paint, has a magnetic function, can be applied to the back of a building or decorative material, does not influence the appearance, and can enable the coated material to have magnetic power.

Chinese patent 201710840714.7 discloses a magnetic-absorption nano water-based paint, a preparation method and application thereof, wherein the paint is modified by superparamagnetic nano particles, and the preparation steps are as follows: the coating is prepared by uniformly mixing a colloidal water dispersion of superparamagnetic ferroferric oxide nanoparticles and coating raw materials in a certain proportion, wherein the emulsion accounts for 25-75%, the ferroferric oxide colloidal water dispersion accounts for 15-70%, the preservative accounts for 0.05-0.1%, the other coating additives account for 12-20% and the balance of water. Wherein, the ferroferric oxide colloidal aqueous dispersion is a colloidal solution obtained by dispersing the superparamagnetic ferroferric oxide magnetic nano particles in water. Based on the superparamagnetism of the nano particles, the magnetic absorption coating disclosed by the invention only generates local strong induced magnetism in the presence of a magnetic field, so that the magnetic absorption is realized. The coating can endow the coated surface with a magnetic attraction function, and if the coating is used, the stable fixing or hanging of an object on a wall body can be realized by combining a magnetic tool. The invention can bring great convenience to life, has important practical value and is suitable for schools, families, offices and various occasions needing to be attached with articles.

However, the magnetic powder added in the two magnetic coatings is respectively nano black magnetic powder and superparamagnetic ferroferric oxide magnetic nano particles, both of which are ferroferric oxide and are soft magnetic materials, so that the magnetic permeability is high, the magnetic coating is easy to magnetize and demagnetize, the magnetic coating can only be attracted by hard magnetic materials such as magnets and the like, other soft magnetic materials cannot be attracted, and the magnetic coating loses magnetism if the magnetic coating is separated from an external magnetic field. In addition, the magnetic coating has low content of added magnetic powder, so that the magnetic coating has weak magnetism and limited attraction with an external magnet, and only light substances can be adsorbed and suspended, thereby greatly limiting the application of the magnetic coating.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides the super-strong magnetic coating with higher magnetic powder content and stronger magnetic absorption performance and the preparation method thereof, which can absorb hard magnetic materials such as magnets, soft magnetic materials such as iron, cobalt, nickel and the like, and greatly widen the application range of the magnetic coating.

The purpose of the invention is realized by the following technical scheme:

the super-strong magnetic coating comprises the following raw materials in parts by weight:

30-50 parts of film forming resin, 50-450 parts of permanent magnetic powder, 30-50 parts of diluent, 1-3 parts of defoaming agent, 3-5 parts of coupling agent and 3-10 parts of toughening agent.

In one embodiment, the film-forming resin is at least one of an epoxy resin, a polyurethane resin, a phenolic resin, an acrylic resin, and a silicone resin.

In one embodiment, the permanent magnet powder is at least one of neodymium iron boron permanent magnet powder, samarium cobalt permanent magnet powder, alnico permanent magnet powder and ferrite permanent magnet powder.

In one embodiment, the diluent is at least one of acetone, ethanol, xylene, and ethyl acetate.

In one embodiment, the defoaming agent is an alcohol defoaming agent, a phosphoric acid defoaming agent, or an amine defoaming agent.

In one embodiment, the coupling agent is a silane coupling agent or a titanate coupling agent.

In one embodiment, the toughening agent is at least one of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and polyvinyl alcohol.

A preparation method of super-strong magnetic paint comprises the following steps:

magnetizing the permanent magnetic powder;

carrying out primary stirring operation on the permanent magnetic powder, the diluent, the defoaming agent, the coupling agent, the toughening agent and part of the film-forming resin to uniformly mix the raw materials to obtain a mixed solution;

and carrying out secondary stirring operation on the mixed solution and the residual amount of the film-forming resin so as to uniformly mix the raw materials to obtain the super-strong magnetic coating.

In one embodiment, the first stirring operation is sealed stirring at 1500-2000 rpm for 2-6 h by using a high-speed shearing machine.

In one embodiment, the second stirring operation is sealed stirring for 2 to 6 hours at a speed of 3000 to 4000 rpm by using a high-speed shearing machine.

Compared with the prior art, the invention has at least the following advantages:

the super-strong magnetic coating selects permanent magnetic powder as a magnetic source, the permanent magnetic powder is mutually attracted after being added into the coating, so that film-forming resin is locked, the content of magnetic powder is greatly improved, the content of the magnetic powder can be up to 90 wt% of the solid content of the coating, the permanent magnetic powder is a hard magnetic material, the magnetic powder is not easy to demagnetize after being magnetized and can retain magnetism for a long time, and the magnetic field intensity of the super-strong magnetic coating is far greater than that of soft magnetic materials such as iron powder, black magnetic powder and the like, so. In addition, the traditional magnetic coating only can absorb hard magnetic materials such as magnets due to the fact that soft magnetic materials such as iron powder and black magnetic powder are selected as magnetic sources, and the permanent magnetic powder added into the coating serves as the hard magnetic materials, so that the hard magnetic materials such as magnets can be absorbed, soft magnetic materials such as iron, cobalt and nickel can be absorbed, and the application range of the magnetic coating is greatly expanded. In addition, the permanent magnetic powder is filled between molecular chains of the film-forming resin, so that the movement of the molecular chains is limited, the connected chain segments are fixed to a certain extent, the glass transition temperature is increased, the thermal deformation temperature is increased, the shrinkage rate is reduced, and the elastic modulus, the hardness, the rigidity, the impact strength, the compression strength, the wear resistance and the corrosion resistance are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a flowchart illustrating steps of a method for preparing a super-strong magnetic paint according to an embodiment of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The super-strong magnetic coating comprises the following raw materials in parts by weight: 30-50 parts of film forming resin, 50-450 parts of permanent magnetic powder, 30-50 parts of diluent, 1-3 parts of defoaming agent, 3-5 parts of coupling agent and 3-10 parts of toughening agent. The preparation method comprises the following steps: magnetizing the permanent magnetic powder; carrying out primary stirring operation on the permanent magnetic powder, the diluent, the defoaming agent, the coupling agent, the toughening agent and part of the film-forming resin to uniformly mix the raw materials to obtain a mixed solution; and carrying out secondary stirring operation on the mixed solution and the residual amount of the film-forming resin so as to uniformly mix the raw materials to obtain the super-strong magnetic coating.

The super magnetic paint is better explained to better understand the concept of the super magnetic paint. One embodiment is a super-magnetic coating, which comprises the following raw materials in parts by weight: 30-50 parts of film forming resin, 50-450 parts of permanent magnetic powder, 30-50 parts of diluent, 1-3 parts of defoaming agent, 3-5 parts of coupling agent and 3-10 parts of toughening agent.

It should be noted that the super-strong magnetic coating selects permanent magnetic powder as a magnetic source, the permanent magnetic powder is mutually attracted after being added into the coating, so as to lock the film-forming resin, the magnetic powder content is greatly improved, the magnetic powder content can be up to 90 wt% of the solid content of the coating, the permanent magnetic powder is a hard magnetic material, the magnetization is not easy to demagnetize, the magnetism can be kept for a long time, and the magnetic field intensity is far greater than that of soft magnetic materials such as iron powder, black magnetic powder and the like, so that the coating has super-strong magnetism. In addition, the traditional magnetic coating only can absorb hard magnetic materials such as magnets due to the fact that soft magnetic materials such as iron powder and black magnetic powder are selected as magnetic sources, and the permanent magnetic powder added into the coating serves as the hard magnetic materials, so that the hard magnetic materials such as magnets can be absorbed, soft magnetic materials such as iron, cobalt and nickel can be absorbed, and the application range of the magnetic coating is greatly expanded. In addition, the permanent magnetic powder is filled between molecular chains of the film-forming resin, so that the movement of the molecular chains is limited, the connected chain segments are fixed to a certain extent, the glass transition temperature is increased, the thermal deformation temperature is increased, the shrinkage rate is reduced, and the elastic modulus, the hardness, the rigidity, the impact strength, the compression strength, the wear resistance and the corrosion resistance are improved.

In addition, the film-forming resin can enable the coating to be crosslinked and cured into a film under the action of moisture in air or under the catalysis of heating. The thinner is used for diluting the concentration of the film-forming resin to reduce the viscosity of the film-forming resin, so that the dispersion uniformity of the permanent magnetic powder in the film-forming resin is improved. The defoaming agent is used for reducing surface tension, inhibiting foam generation or eliminating foam generated in the preparation process of the coating so as to improve compactness, smoothness and smoothness of the coating. The coupling agent is used for improving the compatibility of the film-forming resin and the permanent magnetic powder, so that the film-forming resin can contain more permanent magnetic powder, and the limit addition amount of the permanent magnetic powder is improved. The flexibility of the coating can be reduced while the hardness and the rigidity of the coating are increased by excessive permanent magnetic powder, and the flexibility of the coating is improved by adding a toughening agent to neutralize the hardness and the rigidity of the coating, so that the problem that the coating formed by the coating is easy to crack and quickly expand to cause cracking of the coating when bearing an external force is solved.

Preferably, the super-strong magnetic coating comprises the following raw materials in parts by weight: 35-45 parts of film forming resin, 200-450 parts of permanent magnetic powder, 35-45 parts of diluent, 1-3 parts of defoaming agent, 3-5 parts of coupling agent and 4-8 parts of toughening agent.

More preferably, the super-strong magnetic coating comprises the following raw materials in parts by weight: 35-45 parts of film forming resin, 300-450 parts of permanent magnetic powder, 35-45 parts of diluent, 1-3 parts of defoaming agent, 3-5 parts of coupling agent and 6-8 parts of toughening agent.

In one embodiment, the film-forming resin is at least one of an epoxy resin, a polyurethane resin, a phenolic resin, an acrylic resin, and a silicone resin. For example, the film-forming resin is a common mixture of epoxy, polyurethane, phenolic, acrylic and silicone resins. For example, the film-forming resin is an epoxy resin, a polyurethane resin, a phenolic resin, an acrylic resin, or a silicone resin. The epoxy resin, the polyurethane resin, the phenolic resin, the acrylic resin and the organic silicon resin selected from the film-forming resin can be well compatible with the permanent magnetic powder, and have excellent curing and crosslinking properties, and the curing and crosslinking can form a three-dimensional network structure, so that the film-forming resin has excellent film-forming properties. For example, the film-forming resin is a common mixture of epoxy resin and polyurethane resin, combines the advantages of epoxy resin and polyurethane resin, and has excellent adhesive strength, curing property, tear resistance, wear resistance and corrosion resistance. The organic silicon resin has excellent moisture resistance, water resistance, rust resistance, cold resistance, ozone resistance, weather resistance and corrosion resistance, but the solvent resistance is poorer, and the solvent resistance can be improved by combining the epoxy resin.

In one embodiment, the permanent magnet powder is at least one of neodymium iron boron permanent magnet powder, samarium cobalt permanent magnet powder, alnico permanent magnet powder and ferrite permanent magnet powder. For example, the permanent magnet powder is a common mixture of neodymium iron boron permanent magnet powder, samarium cobalt permanent magnet powder, alnico permanent magnet powder and ferrite permanent magnet powder. For example, the permanent magnet powder is neodymium iron boron permanent magnet powder, samarium cobalt permanent magnet powder, alnico permanent magnet powder or ferrite permanent magnet powder. It should be noted that the neodymium iron boron permanent magnet powder, samarium cobalt permanent magnet powder, alnico permanent magnet powder and ferrite permanent magnet powder selected from the permanent magnet powder are permanent magnet powder with strong magnetism.

In one embodiment, the particle size of the permanent magnetic powder is 30nm to 60 nm. For example, the particle size of the permanent magnetic powder is 30nm, 40nm, 50nm or 60 nm. It should be noted that, to a certain extent, the smaller the particle size of the permanent magnetic powder, the more uniformly the permanent magnetic powder is dispersed in the coating, and the stronger the magnetic absorption performance is, but the greater the production difficulty is, and when the particle size of the permanent magnetic powder is preferably 30nm to 60nm, the better the dispersion uniformity of the permanent magnetic powder in the coating, the stronger the magnetic absorption performance, and the moderate production difficulty is.

In one embodiment, the diluent is at least one of acetone, ethanol, xylene, and ethyl acetate. For example, the diluent is a common mixture of acetone, ethanol, xylene, and ethyl acetate. For example, the diluent is acetone, ethanol, xylene or ethyl acetate. It should be noted that acetone, ethanol, xylene and ethyl acetate selected as diluents are all good solvents of the film-forming resin, and can reduce the viscosity of the film-forming resin, thereby improving the dispersion uniformity of the permanent magnetic powder in the film-forming resin.

In one embodiment, the defoaming agent is an alcohol defoaming agent, a phosphoric acid defoaming agent, or an amine defoaming agent. The alcohol defoaming agent is at least one of 3-heptanol, 2-ethylhexanol, polyoxyethylene alcohol and polypropylene glycol. The phosphoric acid defoaming agent is at least one of tributyl phosphate, triisobutyl phosphate and trialkyl phosphate. The amine defoaming agent is at least one of diammine, stearylamine and oleylamine. It should be noted that the basic properties of the foaming system are not affected by any of the alcohol type defoaming agent, the phosphoric acid type defoaming agent and the amine type defoaming agent. Wherein, alcohol defoamer and phosphoric acid defoamer can reduce the surface tension of liquid for the foam is cracked easily, thereby reaches the effect of defoaming, and its spreading coefficient is great, and the destructive action is very strong, has very strong defoaming effect, and presses down the bubble effect relatively poor. Wherein, the amine defoamer has small spreading coefficient, the surface tension is rapidly reduced after emulsification, and the strong defoaming and foam inhibiting effects can be achieved by using a small amount of the amine defoamer. The alcohol defoaming agent or the phosphoric acid defoaming agent is used in combination with the amine defoaming agent, and has better defoaming and foam inhibiting effects.

In one embodiment, the coupling agent is a silane coupling agent or a titanate coupling agent. For example, the silane coupling agent is at least one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (β -methoxyethoxy) silane), γ -aminopropyltriethoxysilane, γ -glycidoxypropyltrimethoxysilane, γ -chloropropyltrimethoxysilane, γ - (methacryloyloxy) propyltrimethoxysilane, γ -thiopropyltrimethoxysilane and γ -uretropropyltriethoxysilane. The titanate coupling agent is at least one of triisostearoyl isopropyl titanate, isopropyl tri (dioctyl phosphoryloxy) titanate, isopropyl dioleate acyloxy (dioctyl phosphoryloxy) titanate, monoalkoxy unsaturated fatty acid titanate and bis (dioctyl-oxy pyrophosphate) ethylene titanate. It should be noted that, the silane coupling agent and the titanate coupling agent have two functional groups with different properties, one is an inorganophilic group, and is easy to chemically react with the surface of an inorganic substance; the other is an organophilic group which is capable of chemically reacting with or forming hydrogen bonds soluble in synthetic resins or other polymers. By using the silane coupling agent or the titanate coupling agent, a 'molecular bridge' can be erected between the interface of the permanent magnetic powder and the film-forming resin, the dispersity and the adhesive force of the permanent magnetic powder in the film-forming resin can be improved, and the compatibility between the permanent magnetic powder and the film-forming resin is improved, so that the mechanical, electrical and weather resistance of the coating can be improved. The epoxy resin, the polyurethane resin, the phenolic resin and the acrylic resin are preferably silane coupling agents, and the organic silicon resin is preferably titanate coupling agents.

In one embodiment, the toughening agent is at least one of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and polyvinyl alcohol. For example, the toughening agent is a common mixture of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and polyvinyl alcohol. For example, the toughening agent is carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, or polyvinyl alcohol. The coating has the advantages of good compatibility with film-forming resin, good toughening effect, good thickening effect, and capability of neutralizing the hardness and rigidity of the coating and improving the flexibility and film-forming property of the coating, so as to avoid the problem that the coating formed by the coating is easy to crack and rapidly expands to cause cracking of the coating when bearing external force. Carboxymethyl cellulose, hydroxymethyl cellulose and hydroxyethyl cellulose have short molecular chains and stable molecular structures, so that the carboxymethyl cellulose, the hydroxymethyl cellulose and the hydroxyethyl cellulose have excellent salt resistance, acid resistance, calcium resistance, high temperature resistance and other properties.

In one embodiment, referring to fig. 1, a method for preparing a super-strong magnetic paint includes the following steps: s110, magnetizing the permanent magnetic powder; s120, carrying out primary stirring operation on the permanent magnetic powder, the diluent, the defoaming agent, the coupling agent, the toughening agent and part of the film-forming resin to uniformly mix the raw materials to obtain a mixed solution; and S130, carrying out secondary stirring operation on the mixed solution and the residual amount of the film-forming resin so as to uniformly mix the raw materials to obtain the super-strong magnetic coating. It should be noted that the permanent magnetic powder is magnetized to obtain permanent magnetic powder with stronger magnetism and longer magnetic retention time. The film-forming resin has higher viscosity, and can improve the dispersion uniformity of the permanent magnetic powder in the coating by adding the film-forming resin in batches.

Furthermore, it should be noted that the super-strong magnetic coating selects permanent magnetic powder as a magnetic source, and the permanent magnetic powder is mutually attracted after being added into the coating, so as to lock the film-forming resin, thereby greatly improving the magnetic powder content, wherein the magnetic powder content can be up to 90 wt% of the solid content of the coating, the permanent magnetic powder is a hard magnetic material, the magnetization is not easy to demagnetize, and the magnetism can be retained for a long time, and the magnetic field intensity is far greater than that of soft magnetic materials such as iron powder and black magnetic powder, so that the coating has super-strong magnetism. In addition, the traditional magnetic coating only can absorb hard magnetic materials such as magnets due to the fact that soft magnetic materials such as iron powder and black magnetic powder are selected as magnetic sources, and the permanent magnetic powder added into the coating serves as the hard magnetic materials, so that the hard magnetic materials such as magnets can be absorbed, soft magnetic materials such as iron, cobalt and nickel can be absorbed, and the application range of the magnetic coating is greatly expanded. In addition, the permanent magnetic powder is filled between molecular chains of the film-forming resin, so that the movement of the molecular chains is limited, the connected chain segments are fixed to a certain extent, the glass transition temperature is increased, the thermal deformation temperature is increased, the shrinkage rate is reduced, and the elastic modulus, the hardness, the rigidity, the impact strength, the compression strength, the wear resistance and the corrosion resistance are improved.

Furthermore, the film-forming resin can enable the coating to be crosslinked and cured into a film under the action of moisture in air or under the catalysis of heating. The thinner is used for diluting the concentration of the film-forming resin to reduce the viscosity of the film-forming resin, so that the dispersion uniformity of the permanent magnetic powder in the film-forming resin is improved. The defoaming agent is used for reducing surface tension, inhibiting foam generation or eliminating foam generated in the preparation process of the coating so as to improve compactness, smoothness and smoothness of the coating. The coupling agent is used for improving the compatibility of the film-forming resin and the permanent magnetic powder, so that the film-forming resin can contain more permanent magnetic powder, and the limit addition amount of the permanent magnetic powder is improved. The flexibility of the coating can be reduced while the hardness and the rigidity of the coating are increased by excessive permanent magnetic powder, and the flexibility of the coating is improved by adding a toughening agent to neutralize the hardness and the rigidity of the coating, so that the problem that the coating formed by the coating is easy to crack and quickly expand to cause cracking of the coating when bearing an external force is solved.

In one embodiment, the first stirring operation is performed by hermetically stirring for 2 to 6 hours at a speed of 1500 to 2000 rpm using a high-speed shearing machine. For example, the stirring speed of the first stirring operation is 1500 rpm, 1600 rpm, 1700 rpm, 1800 rpm, 1900 rpm or 2000 rpm. For example, the stirring time of the first stirring operation is 2h, 3h, 4h, 5h or 6 h. The film-forming resin has high viscosity, and can achieve high-efficiency and violent stirring and scattering effects by using a high-speed shearing machine, so that the raw materials can be uniformly mixed, the stirring speed of the first stirring operation is preferably 1500-2000 r/min, the stirring time of the first stirring operation is preferably 2-6 h, and good stirring and scattering effects can be achieved.

In one embodiment, the second stirring operation is performed by hermetically stirring for 2 to 6 hours at a speed of 3000 to 4000 rpm using a high-speed shearing machine. For example, the stirring speed of the second stirring operation is 3000 rpm, 3200 rpm, 3400 rpm, 3600 rpm, 3800 rpm or 4000 rpm. For example, the stirring time of the second stirring operation is 2h, 3h, 4h, 5h or 6 h. The film-forming resin has high viscosity, and can achieve high-efficiency and violent stirring and scattering effects by using a high-speed shearing machine, the mixing uniformity of the raw materials can be further improved by stirring the raw materials at a slow speed and a fast speed, the stirring speed of the second stirring operation is preferably 3000-4000 rpm, the stirring time of the second stirring operation is preferably 2-6 h, and the good stirring and scattering effects can be achieved.

In one embodiment, before the operation of magnetizing the permanent magnet powder, a permanent magnet substance is further placed into a shearing crusher to be subjected to shearing crushing operation, so as to obtain a permanent magnet crushed object; putting the crushed material into a grinding crusher, and carrying out low-speed grinding and crushing operation to obtain a permanent magnet crushed material; and putting the crushed material into the grinding crusher, and carrying out high-speed grinding and crushing operation to obtain the permanent magnetic powder, wherein the particle size of the permanent magnetic powder is 30-60 nm. It should be noted that the permanent magnet material is a neodymium iron boron permanent magnet, a samarium cobalt permanent magnet, an alnico permanent magnet, and a ferrite permanent magnet. To a certain extent, the smaller the particle size of the permanent magnetic powder is, the more uniformly the permanent magnetic powder is dispersed in the coating, and the stronger the magnetic absorption performance is, and when the particle size of the permanent magnetic powder is preferably 30 nm-60 nm, the better the dispersion uniformity and the stronger the magnetic absorption performance are. The permanent magnet material can be cut, crushed, ground and crushed at low speed and at high speed, so that the permanent magnet powder has a particle size of 30-60 nm.

Compared with the prior art, the invention has at least the following advantages:

the super-strong magnetic coating selects permanent magnetic powder as a magnetic source, the permanent magnetic powder is mutually attracted after being added into the coating, so that film-forming resin is locked, the content of magnetic powder is greatly improved, the content of the magnetic powder can be up to 90 wt% of the solid content of the coating, the permanent magnetic powder is a hard magnetic material, the magnetic powder is not easy to demagnetize after being magnetized and can retain magnetism for a long time, and the magnetic field intensity of the super-strong magnetic coating is far greater than that of soft magnetic materials such as iron powder, black magnetic powder and the like, so. In addition, the traditional magnetic coating only can absorb hard magnetic materials such as magnets due to the fact that soft magnetic materials such as iron powder and black magnetic powder are selected as magnetic sources, and the permanent magnetic powder added into the coating serves as the hard magnetic materials, so that the hard magnetic materials such as magnets can be absorbed, soft magnetic materials such as iron, cobalt and nickel can be absorbed, and the application range of the magnetic coating is greatly expanded. In addition, the permanent magnetic powder is filled between molecular chains of the film-forming resin, so that the movement of the molecular chains is limited, the connected chain segments are fixed to a certain extent, the glass transition temperature is increased, the thermal deformation temperature is increased, the shrinkage rate is reduced, and the elastic modulus, the hardness, the rigidity, the impact strength, the compression strength, the wear resistance and the corrosion resistance are improved.

The following are detailed description of the embodiments