阅读说明：本技术 一种防腐蚀磁性材料及其生产工艺 (Anti-corrosion magnetic material and production process thereof ) 是由 丛建华 于 2020-11-25 设计创作，主要内容包括：本发明公开一种防腐蚀磁性材料及其生产工艺,包括如下重量份原料：磁性基体60-70份、聚酰胺20-30份、聚四氟乙烯1-3份、纳米材料10-12份和改性微晶纤维素6-10份；生产工艺包括如下步骤制备：第一步、将磁性基体、聚酰胺、聚四氟乙烯、纳米材料和改性微晶纤维素加入混料机中混合搅拌20-40min,混合搅拌后,将得到的物料转移至烘干箱中,在70℃干燥4-6h,得到混合料；第二步、将第一步得到的混合料转移至挤出机中挤出造粒,在200-240℃进行混炼挤出,切粒得到粒径为6-12mm的颗粒,将颗粒在60-80℃干燥20h；将干燥后的颗粒在240-260℃注塑成型,模具温度为70-80℃。(The invention discloses an anti-corrosion magnetic material and a production process thereof, wherein the anti-corrosion magnetic material comprises the following raw materials in parts by weight: 60-70 parts of magnetic matrix, 20-30 parts of polyamide, 1-3 parts of polytetrafluoroethylene, 10-12 parts of nano material and 6-10 parts of modified microcrystalline cellulose; the production process comprises the following steps: firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 20-40min, transferring the obtained material into a drying oven after mixing and stirring, and drying for 4-6h at 70 ℃ to obtain a mixture; secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at the temperature of 200-240 ℃, granulating to obtain particles with the particle size of 6-12mm, and drying the particles for 20 hours at the temperature of 60-80 ℃; and injection molding the dried particles at the temperature of 240-260 ℃, wherein the temperature of the mold is 70-80 ℃.)

1. The anti-corrosion magnetic material is characterized by comprising the following raw materials in parts by weight:

60-70 parts of magnetic matrix, 20-30 parts of polyamide, 1-3 parts of polytetrafluoroethylene, 10-12 parts of nano material and 6-10 parts of modified microcrystalline cellulose;

the anti-corrosion magnetic material is prepared by the following steps:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 20-40min, transferring the obtained material into a drying oven after mixing and stirring, and drying for 4-6h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at the temperature of 200-240 ℃, granulating to obtain particles with the particle size of 6-12mm, and drying the particles for 20 hours at the temperature of 60-80 ℃; and injection molding the dried particles at the temperature of 240-260 ℃, wherein the temperature of the mold is 70-80 ℃.

2. The anti-corrosion magnetic material as claimed in claim 1, wherein the nano material is nano silica, nano calcium carbonate and nano sodium stearate in a mass ratio of 10-14: 7: 10 are mixed together.

3. The anti-corrosion magnetic material according to claim 1, wherein the magnetic matrix is prepared by the steps of:

step S11, under the protection of nitrogen, adding potassium methoxide and methanol dropwise into the trihydroxymethyl propane according to the dosage ratio of 1 g: 5mL of mixed solution; setting the temperature to be 90 ℃, reacting for 20min, after the reaction is finished, concentrating the obtained reaction liquid at 60 ℃ in vacuum until the volume of the reaction liquid is not changed, then adding dioxane into the concentrated reaction liquid, setting the temperature to be 95 ℃, dropwise adding glycidol, controlling the dropwise adding time of the glycidol to be 20h, after the dropwise adding is finished, continuing reacting for 2h, diluting the obtained reaction liquid with methanol with the same volume, passing through a cation exchange resin column for three times, then transferring the solution into acetone for precipitation, dissolving the precipitated precipitate with methanol, repeating the precipitation and dissolution operation for two times, and drying the obtained precipitate at 80 ℃ in vacuum to constant weight to obtain a mixture a;

step S12, mixing sebacoyl chloride and toluene according to the volume ratio of 1: 5 to obtain a solution b, and mixing the mixture a, pyridine and chloroform according to the dosage ratio of 1 g: 10mL of: 10mL of the mixture is mixed to prepare a mixed solution c; dropwise adding the solution b into the mixed solution c, reacting for 20h, concentrating under reduced pressure until the volume of the reaction liquid is not changed, then washing for three times by using deionized water, and after washing, drying in vacuum at 40 ℃ until the weight is constant to obtain a protective agent;

step S13, mixing ferrous ammonium sulfate and deionized water according to the dosage ratio of 3 mg: 1mL of the precursor solution is obtained by mixing, the precursor solution and a protective agent are added into a reaction kettle, an equal volume of diluent is slowly added for dilution under the conditions that the temperature is 25 ℃ and the rotating speed is 500r/min, the dropping speed is controlled to be 2-4 drops/second, after the dropping is finished, the temperature and the rotating speed are kept unchanged, the stirring is continued for 40min, the temperature is increased to 180 ℃, the reaction is continued for 10h, after the reaction is finished, the obtained reaction solution is subjected to reduced pressure suction filtration, and the obtained solid is dried to constant weight at 40 ℃ to obtain the magnetic matrix.

4. The anti-corrosion magnetic material according to claim 3, wherein the mass ratio of the trihydroxymethyl propane to the potassium methoxide in step S11 is 16: 1; the dosage ratio of the trihydroxymethyl propane, the dioxane and the glycidol is 40 mg: 4mL of: 5 mL; the volume ratio of the solution b to the mixed solution c in the step S12 is 1: 2; in the step S13, the diluent is sodium hydroxide and absolute ethyl alcohol according to the dosage ratio of 1 g: 10mL of the above-mentioned components were mixed.

5. The anti-corrosion magnetic material according to claim 1, wherein the modified microcrystalline cellulose is prepared by the following steps:

step S21, mixing microcrystalline cellulose and absolute ethyl alcohol, setting the temperature to be 48-50 ℃ and the rotating speed to be 400r/min, sequentially adding a sodium hydroxide solution and triethylammonium chloride, stirring for 4h, adjusting the reaction solution to be neutral by using a 1mol/L hydrochloric acid solution, then performing vacuum filtration, sequentially washing the obtained filter cake by using methanol and ethanol, and drying the washed filter cake to constant weight at 90 ℃ to obtain a solid c;

and step S22, mixing the solid c and ammonium ceric nitrate in equal mass, adding the mixture into deionized water, stirring the mixture at room temperature for 30min, adding 2-acrylamide-2-methylpropanesulfonic acid in equal mass to the solid c, stirring the mixture at room temperature for 50min, continuously stirring the mixture for 3h at 40 ℃, performing vacuum filtration, and drying the obtained filter cake to constant weight to obtain the modified microcrystalline cellulose.

6. The anti-corrosion magnetic material according to claim 5, wherein the solution concentration of the sodium hydroxide solution in step S21 is 10%; the dosage ratio of the microcrystalline cellulose, the absolute ethyl alcohol, the sodium hydroxide solution and the triethyl ammonium chloride is 1 g: 10-14 mL: 2mL of: 5g of the total weight of the mixture; the ratio of the solid c to the deionized water in step S22 was 1 g: 10-14 mL.

7. The process for producing an anti-corrosion magnetic material according to claim 1, comprising the steps of:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 20-40min, transferring the obtained material into a drying oven after mixing and stirring, and drying for 4-6h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at the temperature of 200-240 ℃, granulating to obtain particles with the particle size of 6-12mm, and drying the particles for 20 hours at the temperature of 60-80 ℃; and injection molding the dried particles at the temperature of 240-260 ℃, wherein the temperature of the mold is 70-80 ℃.

Technical Field

The invention belongs to the technical field of magnetic materials, and particularly relates to an anti-corrosion magnetic material and a production process thereof.

Background

Materials that react in some way to magnetic fields are called magnetic materials. Substances can be classified into diamagnetic substances, paramagnetic substances, ferromagnetic substances, antiferromagnetic substances, and ferrimagnetic substances according to the strength of magnetism exhibited by the substances in an external magnetic field. Most materials are diamagnetic or paramagnetic and they are less reactive to external magnetic fields. Ferromagnetic substances and ferrimagnetic substances are ferromagnetic substances, and magnetic materials are generally called ferromagnetic materials. Magnetic materials are generally classified into soft magnetic materials and hard magnetic materials according to their ease of magnetization.

Modern anti-corrosion magnetic materials are widely used in our lives, and with the rapid development of the world economy and scientific technology, the demand of the magnetic materials is wide at present. The magnetic material plays an important role in the traditional and emerging fields of electronics, computers, information communication, medical treatment, aerospace, automobiles, wind power, environmental protection, energy conservation and the like.

Disclosure of Invention

The invention provides an anti-corrosion magnetic material and a production process thereof.

The technical problems to be solved by the invention are as follows:

the prior magnetic material has the problems of poor corrosion resistance, poor magnetic stability, short service life and the like, and influences the further application of the product.

The purpose of the invention can be realized by the following technical scheme:

an anti-corrosion magnetic material comprises the following raw materials in parts by weight:

60-70 parts of magnetic matrix, 20-30 parts of polyamide, 1-3 parts of polytetrafluoroethylene, 10-12 parts of nano material and 6-10 parts of modified microcrystalline cellulose;

the anti-corrosion magnetic material is prepared by the following steps:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 20-40min, transferring the obtained material into a drying oven after mixing and stirring, and drying for 4-6h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at the temperature of 200-240 ℃, granulating to obtain particles with the particle size of 6-12mm, and drying the particles for 20 hours at the temperature of 60-80 ℃; and injection molding the dried particles at the temperature of 240-260 ℃, wherein the temperature of the mold is 70-80 ℃.

Further, the nano material is nano silicon dioxide, nano calcium carbonate and nano sodium stearate according to the mass ratio of 10-14: 7: 10 are mixed together.

Further, the magnetic matrix is prepared by the following steps:

step S11, under the protection of nitrogen, adding potassium methoxide and methanol dropwise into the trihydroxymethyl propane according to the dosage ratio of 1 g: 5mL of mixed solution; setting the temperature to be 90 ℃, reacting for 20min, after the reaction is finished, concentrating the obtained reaction liquid at 60 ℃ in vacuum until the volume of the reaction liquid is not changed, then adding dioxane into the concentrated reaction liquid, setting the temperature to be 95 ℃, dropwise adding glycidol, controlling the dropwise adding time of the glycidol to be 20h, after the dropwise adding is finished, continuing reacting for 2h, diluting the obtained reaction liquid with methanol with the same volume, passing through a cation exchange resin column for three times, then transferring the solution into acetone for precipitation, dissolving the precipitated precipitate with methanol, repeating the precipitation and dissolution operation for two times, and drying the obtained precipitate at 80 ℃ in vacuum to constant weight to obtain a mixture a;

step S12, mixing sebacoyl chloride and toluene according to the volume ratio of 1: 5 to obtain a solution b, and mixing the mixture a, pyridine and chloroform according to the dosage ratio of 1 g: 10mL of: 10mL of the mixture is mixed to prepare a mixed solution c; dropwise adding the solution b into the mixed solution c, reacting for 20h, concentrating under reduced pressure until the volume of the reaction liquid is not changed, then washing for three times by using deionized water, and after washing, drying in vacuum at 40 ℃ until the weight is constant to obtain a protective agent; trihydroxy methyl propane is used as an initiator, ring-opening polymerization is carried out on the trihydroxy methyl propane and glycidol to prepare a mixture a, the mixture a contains a large number of hydroxyl groups, sebacoyl chloride is grafted to the prepared mixture a, the sebacoyl chloride can be grafted with partial hydroxyl groups on the mixture a, and the prepared protective agent has amphipathy; because the magnetic matrix has amphipathy, a relatively stable micro-capsule structure can be formed when the magnetic matrix is mixed with a precursor solution, particles in the precursor solution are coated to form a relatively small reaction environment, the prepared magnetic matrix has uniform particle size, the relatively complete structure can be maintained, and meanwhile, the magnetic matrix can be coated by a protective agent, so that the dispersibility and stability of the magnetic matrix in subsequent reactions are ensured.

Step S13, mixing ferrous ammonium sulfate and deionized water according to the dosage ratio of 3 mg: 1mL of the precursor solution is obtained by mixing, the precursor solution and a protective agent are added into a reaction kettle, an equal volume of diluent is slowly added for dilution under the conditions that the temperature is 25 ℃ and the rotating speed is 500r/min, the dropping speed is controlled to be 2-4 drops/second, after the dropping is finished, the temperature and the rotating speed are kept unchanged, the stirring is continued for 40min, the temperature is increased to 180 ℃, the reaction is continued for 10h, after the reaction is finished, the obtained reaction solution is subjected to reduced pressure suction filtration, and the obtained solid is dried to constant weight at 40 ℃ to obtain the magnetic matrix.

Further, in step S11, the mass ratio of trihydroxymethyl propane to potassium methoxide is 16: 1; the dosage ratio of the trihydroxymethyl propane, the dioxane and the glycidol is 40 mg: 4mL of: 5 mL; the volume ratio of the solution b to the mixed solution c in the step S12 is 1: 2; in the step S13, the diluent is sodium hydroxide and absolute ethyl alcohol according to the dosage ratio of 1 g: 10mL of the above-mentioned components were mixed.

Further, the modified microcrystalline cellulose is prepared by the steps of:

step S21, mixing microcrystalline cellulose and absolute ethyl alcohol, setting the temperature to be 48-50 ℃ and the rotating speed to be 400r/min, sequentially adding a sodium hydroxide solution and triethylammonium chloride, stirring for 4h, adjusting the reaction solution to be neutral by using a 1mol/L hydrochloric acid solution, then performing vacuum filtration, sequentially washing the obtained filter cake by using methanol and ethanol, and drying the washed filter cake to constant weight at 90 ℃ to obtain a solid c;

and step S22, mixing the solid c and ammonium ceric nitrate in equal mass, adding the mixture into deionized water, stirring the mixture at room temperature for 30min, adding 2-acrylamide-2-methylpropanesulfonic acid in equal mass to the solid c, stirring the mixture at room temperature for 50min, continuously stirring the mixture for 3h at 40 ℃, performing vacuum filtration, and drying the obtained filter cake to constant weight to obtain the modified microcrystalline cellulose. When the modified microcrystalline cellulose is prepared, triethylammonium chloride is used as a cationic monomer, 2-acrylamide-2-methylpropanesulfonic acid is used as an anionic monomer, and the modified microcrystalline cellulose is grafted to the surface of the microcrystalline cellulose in a chemical form, so that the modified microcrystalline cellulose has hydrophilicity and hydrophobicity at the same time, has good dispersibility and a nano porous structure, can form a three-dimensional network in a magnetic material as a framework of the magnetic material, and has good structural stability, thereby enhancing the strength of the prepared magnetic material; meanwhile, the wrapped magnetic matrix and the microcrystalline cellulose are uniformly dispersed through the adsorption effect, so that the uniform magnetism is improved. The addition of the nano material prevents the corrosion medium from diffusing to the magnetic material, and improves the corrosion resistance of the material.

Further, the solution concentration of the sodium hydroxide solution in step S21 is 10%; the dosage ratio of the microcrystalline cellulose, the absolute ethyl alcohol, the sodium hydroxide solution and the triethyl ammonium chloride is 1 g: 10-14 mL: 2mL of: 5g of the total weight of the mixture; the ratio of the solid c to the deionized water in step S22 was 1 g: 10-14 mL.

Further, the production process of the anti-corrosion magnetic material comprises the following steps:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 20-40min, transferring the obtained material into a drying oven after mixing and stirring, and drying for 4-6h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at the temperature of 200-240 ℃, granulating to obtain particles with the particle size of 6-12mm, and drying the particles for 20 hours at the temperature of 60-80 ℃; and injection molding the dried particles at the temperature of 240-260 ℃, wherein the temperature of the mold is 70-80 ℃.

The invention has the beneficial effects that:

trihydroxy methyl propane is used as an initiator, ring-opening polymerization is carried out on the trihydroxy methyl propane and glycidol to prepare a mixture a, the mixture a contains a large number of hydroxyl groups, sebacoyl chloride is grafted to the prepared mixture a, the sebacoyl chloride can be grafted with partial hydroxyl groups on the mixture a, and the prepared protective agent has amphipathy; because the magnetic material has amphipathy, a relatively stable micro-capsule structure can be formed when the magnetic material is mixed with a precursor solution, particles in the precursor solution are coated to form a relatively small reaction environment, the prepared magnetic matrix has uniform particle size and can keep the relatively complete structure, and meanwhile, the protective agent can wrap the magnetic matrix, so that the dispersibility and stability of the magnetic matrix in subsequent reactions are ensured, a corrosive medium is prevented from diffusing to the magnetic material, and the corrosion resistance of the material is improved.

When the modified microcrystalline cellulose is prepared, triethylammonium chloride is used as a cationic monomer, 2-acrylamide-2-methylpropanesulfonic acid is used as an anionic monomer, and the modified microcrystalline cellulose is grafted to the surface of the microcrystalline cellulose in a chemical form, so that the modified microcrystalline cellulose has hydrophilicity and hydrophobicity at the same time, has good dispersibility and a nano porous structure, can form a three-dimensional network in a magnetic material as a framework of the magnetic material, and has good structural stability, thereby enhancing the strength of the prepared magnetic material; meanwhile, the wrapped magnetic matrix and the microcrystalline cellulose are uniformly dispersed through the adsorption effect, so that the uniform magnetism is improved. The addition of the nano material can also prevent the corrosive medium from diffusing to the magnetic material, thereby improving the corrosion resistance of the material.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

An anti-corrosion magnetic material comprises the following raw materials in parts by weight:

60 parts of magnetic matrix, 20 parts of polyamide, 1 part of polytetrafluoroethylene, 10 parts of nano material and 6 parts of modified microcrystalline cellulose;

the anti-corrosion magnetic material is prepared by the following steps:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 20min, transferring the obtained material into a drying box after mixing and stirring, and drying for 4h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at 200 ℃, granulating to obtain particles with the particle size of 6mm, and drying the particles for 20 hours at 60 ℃; the dried granules were injection molded at 240 ℃ with a mold temperature of 70 ℃.

Further, the nano material is nano silicon dioxide, nano calcium carbonate and nano sodium stearate according to the mass ratio of 10: 7: 10 are mixed together.

Wherein the magnetic matrix is prepared by the following steps:

step S11, under the protection of nitrogen, adding potassium methoxide and methanol dropwise into the trihydroxymethyl propane according to the dosage ratio of 1 g: 5mL of mixed solution; setting the temperature to be 90 ℃, reacting for 20min, after the reaction is finished, concentrating the obtained reaction liquid at 60 ℃ in vacuum until the volume of the reaction liquid is not changed, then adding dioxane into the concentrated reaction liquid, setting the temperature to be 95 ℃, dropwise adding glycidol, controlling the dropwise adding time of the glycidol to be 20h, after the dropwise adding is finished, continuing reacting for 2h, diluting the obtained reaction liquid with methanol with the same volume, passing through a cation exchange resin column for three times, then transferring the solution into acetone for precipitation, dissolving the precipitated precipitate with methanol, repeating the precipitation and dissolution operation for two times, and drying the obtained precipitate at 80 ℃ in vacuum to constant weight to obtain a mixture a;

step S12, mixing sebacoyl chloride and toluene according to the volume ratio of 1: 5 to obtain a solution b, and mixing the mixture a, pyridine and chloroform according to the dosage ratio of 1 g: 10mL of: 10mL of the mixture is mixed to prepare a mixed solution c; dropwise adding the solution b into the mixed solution c, reacting for 20h, concentrating under reduced pressure until the volume of the reaction liquid is not changed, then washing for three times by using deionized water, and after washing, drying in vacuum at 40 ℃ until the weight is constant to obtain a protective agent;

step S13, mixing ferrous ammonium sulfate and deionized water according to the dosage ratio of 3 mg: 1mL of the precursor solution is obtained by mixing, the precursor solution and a protective agent are added into a reaction kettle, an equal volume of diluent is slowly added for dilution under the conditions that the temperature is 25 ℃ and the rotating speed is 500r/min, the dropping speed is controlled to be 2 drops/second, after the dropping is finished, the temperature and the rotating speed are kept unchanged, the stirring is continued for 40min, the temperature is increased to 180 ℃, the reaction is continued for 10h, after the reaction is finished, the obtained reaction solution is subjected to reduced pressure suction filtration, and the obtained solid is dried to constant weight at 40 ℃ to obtain the magnetic matrix.

Wherein the mass ratio of the trihydroxymethyl propane to the potassium methoxide in the step S11 is 16: 1; the dosage ratio of the trihydroxymethyl propane, the dioxane and the glycidol is 40 mg: 4mL of: 5 mL; the volume ratio of the solution b to the mixed solution c in the step S12 is 1: 2; in the step S13, the diluent is sodium hydroxide and absolute ethyl alcohol according to the dosage ratio of 1 g: 10mL of the above-mentioned components were mixed.

Wherein the modified microcrystalline cellulose is prepared by the following steps:

step S21, mixing microcrystalline cellulose and absolute ethyl alcohol, setting the temperature to be 48 ℃ and the rotating speed to be 400r/min, sequentially adding a sodium hydroxide solution and triethylammonium chloride, stirring for 4 hours, adjusting the reaction solution to be neutral by using a 1mol/L hydrochloric acid solution, then performing vacuum filtration, sequentially washing the obtained filter cake by using methanol and ethanol, drying the washed filter cake to constant weight at 90 ℃, and obtaining a solid c;

and step S22, mixing the solid c and ammonium ceric nitrate in equal mass, adding the mixture into deionized water, stirring the mixture at room temperature for 30min, adding 2-acrylamide-2-methylpropanesulfonic acid in equal mass to the solid c, stirring the mixture at room temperature for 50min, continuously stirring the mixture for 3h at 40 ℃, performing vacuum filtration, and drying the obtained filter cake to constant weight to obtain the modified microcrystalline cellulose.

Wherein the solution concentration of the sodium hydroxide solution in the step S21 is 10%; the dosage ratio of the microcrystalline cellulose, the absolute ethyl alcohol, the sodium hydroxide solution and the triethyl ammonium chloride is 1 g: 10mL of: 2mL of: 5g of the total weight of the mixture; the ratio of the solid c to the deionized water in step S22 was 1 g: 10 mL.

Example 2

An anti-corrosion magnetic material comprises the following raw materials in parts by weight:

65 parts of magnetic matrix, 25 parts of polyamide, 2 parts of polytetrafluoroethylene, 11 parts of nano material and 8 parts of modified microcrystalline cellulose;

the anti-corrosion magnetic material is prepared by the following steps:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 30min, transferring the obtained material into a drying box after mixing and stirring, and drying for 5h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at 220 ℃, granulating to obtain particles with the particle size of 9mm, and drying the particles for 20 hours at 70 ℃; the dried granules were injection molded at 250 ℃ with a mold temperature of 75 ℃.

Further, the nano material is nano silicon dioxide, nano calcium carbonate and nano sodium stearate according to the mass ratio of 12: 7: 10 are mixed together.

Wherein the magnetic matrix is prepared by the following steps:

step S11, under the protection of nitrogen, adding potassium methoxide and methanol dropwise into the trihydroxymethyl propane according to the dosage ratio of 1 g: 5mL of mixed solution; setting the temperature to be 90 ℃, reacting for 20min, after the reaction is finished, concentrating the obtained reaction liquid at 60 ℃ in vacuum until the volume of the reaction liquid is not changed, then adding dioxane into the concentrated reaction liquid, setting the temperature to be 95 ℃, dropwise adding glycidol, controlling the dropwise adding time of the glycidol to be 20h, after the dropwise adding is finished, continuing reacting for 2h, diluting the obtained reaction liquid with methanol with the same volume, passing through a cation exchange resin column for three times, then transferring the solution into acetone for precipitation, dissolving the precipitated precipitate with methanol, repeating the precipitation and dissolution operation for two times, and drying the obtained precipitate at 80 ℃ in vacuum to constant weight to obtain a mixture a;

step S12, mixing sebacoyl chloride and toluene according to the volume ratio of 1: 5 to obtain a solution b, and mixing the mixture a, pyridine and chloroform according to the dosage ratio of 1 g: 10mL of: 10mL of the mixture is mixed to prepare a mixed solution c; dropwise adding the solution b into the mixed solution c, reacting for 20h, concentrating under reduced pressure until the volume of the reaction liquid is not changed, then washing for three times by using deionized water, and after washing, drying in vacuum at 40 ℃ until the weight is constant to obtain a protective agent;

step S13, mixing ferrous ammonium sulfate and deionized water according to the dosage ratio of 3 mg: 1mL of the precursor solution is obtained by mixing, the precursor solution and a protective agent are added into a reaction kettle, an equal volume of diluent is slowly added for dilution under the conditions that the temperature is 25 ℃ and the rotating speed is 500r/min, the dropping speed is controlled to be 3 drops/second, after the dropping is finished, the temperature and the rotating speed are kept unchanged, the stirring is continued for 40min, the temperature is increased to 180 ℃, the reaction is continued for 10h, after the reaction is finished, the obtained reaction solution is subjected to reduced pressure suction filtration, and the obtained solid is dried to constant weight at 40 ℃ to obtain the magnetic matrix.

Wherein the mass ratio of the trihydroxymethyl propane to the potassium methoxide in the step S11 is 16: 1; the dosage ratio of the trihydroxymethyl propane, the dioxane and the glycidol is 40 mg: 4mL of: 5 mL; the volume ratio of the solution b to the mixed solution c in the step S12 is 1: 2; in the step S13, the diluent is sodium hydroxide and absolute ethyl alcohol according to the dosage ratio of 1 g: 10mL of the above-mentioned components were mixed.

Wherein the modified microcrystalline cellulose is prepared by the following steps:

step S21, mixing microcrystalline cellulose and absolute ethyl alcohol, setting the temperature to 49 ℃ and the rotating speed to 400r/min, sequentially adding a sodium hydroxide solution and triethylammonium chloride, stirring for 4 hours, adjusting the reaction solution to be neutral by using a 1mol/L hydrochloric acid solution, then performing vacuum filtration, sequentially washing the obtained filter cake by using methanol and ethanol, drying the washed filter cake to constant weight at 90 ℃, and obtaining a solid c;

and step S22, mixing the solid c and ammonium ceric nitrate in equal mass, adding the mixture into deionized water, stirring the mixture at room temperature for 30min, adding 2-acrylamide-2-methylpropanesulfonic acid in equal mass to the solid c, stirring the mixture at room temperature for 50min, continuously stirring the mixture for 3h at 40 ℃, performing vacuum filtration, and drying the obtained filter cake to constant weight to obtain the modified microcrystalline cellulose.

Wherein the solution concentration of the sodium hydroxide solution in the step S21 is 10%; the dosage ratio of the microcrystalline cellulose, the absolute ethyl alcohol, the sodium hydroxide solution and the triethyl ammonium chloride is 1 g: 12mL of: 2mL of: 5g of the total weight of the mixture; the ratio of the solid c to the deionized water in step S22 was 1 g: 12 mL.

Example 3

An anti-corrosion magnetic material comprises the following raw materials in parts by weight:

70 parts of magnetic matrix, 30 parts of polyamide, 3 parts of polytetrafluoroethylene, 12 parts of nano material and 10 parts of modified microcrystalline cellulose;

the anti-corrosion magnetic material is prepared by the following steps:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 40min, transferring the obtained material into a drying box after mixing and stirring, and drying for 6h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at 240 ℃, granulating to obtain particles with the particle size of 12mm, and drying the particles for 20 hours at 80 ℃; the dried granules were injection molded at 260 ℃ with a mold temperature of 80 ℃.

Further, the nano material is nano silicon dioxide, nano calcium carbonate and nano sodium stearate according to a mass ratio of 14: 7: 10 are mixed together.

Wherein the magnetic matrix is prepared by the following steps:

step S11, under the protection of nitrogen, adding potassium methoxide and methanol dropwise into the trihydroxymethyl propane according to the dosage ratio of 1 g: 5mL of mixed solution; setting the temperature to be 90 ℃, reacting for 20min, after the reaction is finished, concentrating the obtained reaction liquid at 60 ℃ in vacuum until the volume of the reaction liquid is not changed, then adding dioxane into the concentrated reaction liquid, setting the temperature to be 95 ℃, dropwise adding glycidol, controlling the dropwise adding time of the glycidol to be 20h, after the dropwise adding is finished, continuing reacting for 2h, diluting the obtained reaction liquid with methanol with the same volume, passing through a cation exchange resin column for three times, then transferring the solution into acetone for precipitation, dissolving the precipitated precipitate with methanol, repeating the precipitation and dissolution operation for two times, and drying the obtained precipitate at 80 ℃ in vacuum to constant weight to obtain a mixture a;

step S12, mixing sebacoyl chloride and toluene according to the volume ratio of 1: 5 to obtain a solution b, and mixing the mixture a, pyridine and chloroform according to the dosage ratio of 1 g: 10mL of: 10mL of the mixture is mixed to prepare a mixed solution c; dropwise adding the solution b into the mixed solution c, reacting for 20h, concentrating under reduced pressure until the volume of the reaction liquid is not changed, then washing for three times by using deionized water, and after washing, drying in vacuum at 40 ℃ until the weight is constant to obtain a protective agent;

step S13, mixing ferrous ammonium sulfate and deionized water according to the dosage ratio of 3 mg: 1mL of the precursor solution is obtained by mixing, the precursor solution and a protective agent are added into a reaction kettle, an equal volume of diluent is slowly added for dilution under the conditions that the temperature is 25 ℃ and the rotating speed is 500r/min, the dropping speed is controlled to be 4 drops/second, after the dropping is finished, the temperature and the rotating speed are kept unchanged, the stirring is continued for 40min, the temperature is increased to 180 ℃, the reaction is continued for 10h, after the reaction is finished, the obtained reaction solution is subjected to reduced pressure suction filtration, and the obtained solid is dried to constant weight at 40 ℃ to obtain the magnetic matrix.

Wherein the mass ratio of the trihydroxymethyl propane to the potassium methoxide in the step S11 is 16: 1; the dosage ratio of the trihydroxymethyl propane, the dioxane and the glycidol is 40 mg: 4mL of: 5 mL; the volume ratio of the solution b to the mixed solution c in the step S12 is 1: 2; in the step S13, the diluent is sodium hydroxide and absolute ethyl alcohol according to the dosage ratio of 1 g: 10mL of the above-mentioned components were mixed.

Wherein the modified microcrystalline cellulose is prepared by the following steps:

step S21, mixing microcrystalline cellulose and absolute ethyl alcohol, setting the temperature to be 50 ℃ and the rotating speed to be 400r/min, sequentially adding a sodium hydroxide solution and triethylammonium chloride, stirring for 4 hours, adjusting the reaction solution to be neutral by using a 1mol/L hydrochloric acid solution, then performing vacuum filtration, sequentially washing the obtained filter cake by using methanol and ethanol, drying the washed filter cake to constant weight at 90 ℃, and obtaining a solid c;

and step S22, mixing the solid c and ammonium ceric nitrate in equal mass, adding the mixture into deionized water, stirring the mixture at room temperature for 30min, adding 2-acrylamide-2-methylpropanesulfonic acid in equal mass to the solid c, stirring the mixture at room temperature for 50min, continuously stirring the mixture for 3h at 40 ℃, performing vacuum filtration, and drying the obtained filter cake to constant weight to obtain the modified microcrystalline cellulose.

Wherein the solution concentration of the sodium hydroxide solution in the step S21 is 10%; the dosage ratio of the microcrystalline cellulose, the absolute ethyl alcohol, the sodium hydroxide solution and the triethyl ammonium chloride is 1 g: 14mL of: 2mL of: 5g of the total weight of the mixture; the ratio of the solid c to the deionized water in step S22 was 1 g: 14 mL.

Comparative example 1

An anti-corrosion magnetic material comprises the following raw materials in parts by weight:

60 parts of magnetic matrix, 20 parts of polyamide, 1 part of polytetrafluoroethylene, 10 parts of nano material and 6 parts of modified microcrystalline cellulose;

the anti-corrosion magnetic material is prepared by the following steps:

firstly, adding a magnetic matrix, polyamide, polytetrafluoroethylene, a nano material and modified microcrystalline cellulose into a mixer, mixing and stirring for 20min, transferring the obtained material into a drying box after mixing and stirring, and drying for 4h at 70 ℃ to obtain a mixture;

secondly, transferring the mixture obtained in the first step into an extruder for extrusion granulation, mixing and extruding at 200 ℃, granulating to obtain particles with the particle size of 6mm, and drying the particles for 20 hours at 60 ℃; the dried granules were injection molded at 240 ℃ with a mold temperature of 70 ℃.

Further, the nano material is nano silicon dioxide, nano calcium carbonate and nano sodium stearate according to the mass ratio of 10: 7: 10 are mixed together.

Wherein the magnetic matrix is prepared by the following steps:

step S11, mixing ferrous ammonium sulfate and deionized water according to the dosage ratio of 3 mg: 1mL of the precursor solution is mixed to obtain a precursor solution, the precursor solution is added into a reaction kettle, an equal volume of diluent is slowly added for dilution under the conditions that the temperature is 25 ℃ and the rotating speed is 500r/min, the dropping speed is controlled to be 2 drops/second, after the dropping is finished, the temperature and the rotating speed are kept unchanged, the stirring is continued for 40min, the temperature is increased to 180 ℃, the reaction is continued for 10h, after the reaction is finished, the obtained reaction solution is subjected to reduced pressure suction filtration, and the obtained solid is dried to constant weight at 40 ℃ to obtain the magnetic matrix.

Wherein, in the step S11, the diluent is sodium hydroxide and absolute ethyl alcohol according to the dosage ratio of 1 g: 10 mL.

Wherein the modified microcrystalline cellulose is prepared by the following steps:

step S21, mixing microcrystalline cellulose and absolute ethyl alcohol, setting the temperature to be 48 ℃ and the rotating speed to be 400r/min, sequentially adding a sodium hydroxide solution and triethylammonium chloride, stirring for 4 hours, adjusting the reaction solution to be neutral by using a 1mol/L hydrochloric acid solution, then performing vacuum filtration, sequentially washing the obtained filter cake by using methanol and ethanol, drying the washed filter cake to constant weight at 90 ℃, and obtaining a solid c;

and step S22, mixing the solid c and ammonium ceric nitrate in equal mass, adding the mixture into deionized water, stirring the mixture at room temperature for 30min, adding 2-acrylamide-2-methylpropanesulfonic acid in equal mass to the solid c, stirring the mixture at room temperature for 50min, continuously stirring the mixture for 3h at 40 ℃, performing vacuum filtration, and drying the obtained filter cake to constant weight to obtain the modified microcrystalline cellulose.

Wherein the solution concentration of the sodium hydroxide solution in the step S21 is 10%; the dosage ratio of the microcrystalline cellulose, the absolute ethyl alcohol, the sodium hydroxide solution and the triethyl ammonium chloride is 1 g: 10mL of: 2mL of: 5g of the total weight of the mixture; the ratio of the solid c to the deionized water in step S22 was 1 g: 10 mL.

Comparative example 2

The modified nanocellulose in example 1 was removed, and the remaining raw materials and preparation process were unchanged.

The performance test is carried out on the anti-corrosion magnetic materials prepared in the examples 1-3 and the comparative examples 1-2, the anti-corrosion performance test is carried out according to the test standard conditions of GB/T10125-2012, and the mass loss is calculated; the product was tested for tensile strength according to the standard test conditions of ATSM-D638, with an acidic solution of hydrochloric acid at 25 ℃ and pH 2 and a basic solution of sodium hydroxide at 25 ℃ and H13, and corrosion was detected.

The test results are shown in table 1 below:

TABLE 1

Item	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2
						Mass loss (%)	0.09	0.08	0.09	0.41	0.35
Tensile strength	77	76	77	45	43
						Time to corrosion under acidic conditions	50	51	51	33	33
Corrosion time under alkaline conditions	61	63	62	31	35

From the above table 1, it can be seen that the modified nanocellulose and the protective agent synthesized by the invention can improve the corrosion resistance of the material when preparing a corrosion-resistant magnetic material, and simultaneously the tensile strength of the material is also improved.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.