阅读说明：本技术 一种磁性塑料及其制备方法 (Magnetic plastic and preparation method thereof ) 是由 时乾中 朱平 于 2018-06-12 设计创作，主要内容包括：本发明公开了一种磁性塑料,由以下重量份的原料组成：低密度聚乙烯20-40份、二乙烯基苯15-25份、二氧化硅包覆的四氧化三铁颗粒6-8份、邻甲基苯二醇3-5份、增塑剂4-6份、己内酰胺1-2份、纤维素纳米晶1-2份、抗静电剂3-4份、粘胶纤维2-4份、稳定剂1-2份、乙二醇月桂酸酰胺2-4份、硅酸钠2-4份、氧化钙4-8份、聚多巴胺3-5份、硬脂酸钡2-4份、己内酰胺1-3份、炭黑3-5份、有机硅树脂5-15份、润滑剂3-5份、抗氧剂2-4份。本发明具有成分均匀稳定、防潮防腐,具有磁性材料的功能,而且具有优良的理化性能与磁性,力学性能优异,加工性能优越,生产工艺简单,成本低,材质轻便,易加工,可广泛用于电子、光电、通信、生活等领域。(The invention discloses a magnetic plastic which is prepared from the following raw materials in parts by weight: 20-40 parts of low-density polyethylene, 15-25 parts of divinylbenzene, 6-8 parts of silicon dioxide coated ferroferric oxide particles, 3-5 parts of o-methylbenzene glycol, 4-6 parts of plasticizer, 1-2 parts of caprolactam, 1-2 parts of cellulose nanocrystal, 3-4 parts of antistatic agent, 2-4 parts of viscose, 1-2 parts of stabilizer, 2-4 parts of ethylene glycol lauric acid amide, 2-4 parts of sodium silicate, 4-8 parts of calcium oxide, 3-5 parts of polydopamine, 2-4 parts of barium stearate, 1-3 parts of caprolactam, 3-5 parts of carbon black, 5-15 parts of organic silicon resin, 3-5 parts of lubricant and 2-4 parts of antioxidant. The invention has the advantages of uniform and stable components, moisture resistance, corrosion resistance, magnetic material function, excellent physical and chemical properties, excellent mechanical properties, excellent processing performance, simple production process, low cost, light and convenient material, easy processing and wide application in the fields of electronics, photoelectricity, communication, life and the like.)

1. The magnetic plastic is characterized by comprising the following raw materials in parts by weight: 20-40 parts of low-density polyethylene, 15-25 parts of divinylbenzene, 6-8 parts of silicon dioxide coated ferroferric oxide particles, 3-5 parts of o-methylbenzene glycol, 4-6 parts of plasticizer, 1-2 parts of caprolactam, 1-2 parts of cellulose nanocrystal, 3-4 parts of antistatic agent, 2-4 parts of viscose, 1-2 parts of stabilizer, 2-4 parts of ethylene glycol lauric acid amide, 2-4 parts of sodium silicate, 4-8 parts of calcium oxide, 3-5 parts of polydopamine, 2-4 parts of barium stearate, 1-3 parts of caprolactam, 3-5 parts of carbon black, 5-15 parts of organic silicon resin, 3-5 parts of lubricant and 2-4 parts of antioxidant.

2. The magnetic plastic as claimed in claim 1, characterized by consisting of the following raw materials in parts by weight: 25-35 parts of low-density polyethylene, 18-22 parts of divinylbenzene, 6.5-7.5 parts of silicon dioxide coated ferroferric oxide particles, 3.5-4.5 parts of o-methylbenzene glycol, 4.5-5.5 parts of plasticizer, 1.2-1.8 parts of caprolactam, 1.2-1.8 parts of cellulose nanocrystal, 3.2-3.8 parts of antistatic agent, 2.5-3.5 parts of viscose fiber, 1.2-1.8 parts of stabilizer, 2.5-3.5 parts of ethylene glycol lauric acid amide, 2.5-3.5 parts of sodium silicate, 5-7 parts of calcium oxide, 3.5-4.5 parts of polydopamine, 2.5-3.5 parts of barium stearate, 1.5-2.5 parts of caprolactam, 3.5-4.5 parts of carbon black, 8-12 parts of organic silicon resin, 3.5-4.5 parts of lubricant and 2.5-3.5 parts of antioxidant.

3. The magnetic plastic as claimed in claim 1, characterized by consisting of the following raw materials in parts by weight: 30 parts of low-density polyethylene, 20 parts of divinylbenzene, 7 parts of silicon dioxide coated ferroferric oxide particles, 4 parts of o-methylbenzene glycol, 5 parts of plasticizer, 1.5 parts of caprolactam, 1.5 parts of cellulose nanocrystal, 3.5 parts of antistatic agent, 3 parts of viscose, 1.5 parts of stabilizer, 3 parts of ethylene glycol lauric acid amide, 3 parts of sodium silicate, 6 parts of calcium oxide, 4 parts of polydopamine, 3 parts of barium stearate, 2 parts of caprolactam, 4 parts of carbon black, 10 parts of organic silicon resin, 4 parts of lubricant and 3 parts of antioxidant.

4. The magnetic plastic according to any one of claims 1 to 3, wherein the lubricant is any one of pentaerythritol stearate, oxidized polyethylene wax, polyethylene wax or polypropylene wax.

5. A magnetic plastic according to any one of claims 1-3, characterized in that the antioxidant is antioxidant 1010 or antioxidant 168 or antioxidant TNP.

6. A magnetic plastic according to any one of claims 1-3, characterized in that the plasticizer is one of DEHP, DOP, DBP.

7. A method for preparing a magnetic plastic as claimed in any one of claims 1 to 3, characterized by the specific steps of:

(1) weighing the raw materials in parts by weight;

(2) synthesizing ferroferric oxide nanoparticles by a coprecipitation method, taking magnetic ferroferric oxide nanoparticles, ultrasonically dispersing the magnetic ferroferric oxide nanoparticles in a solvent, dropwise adding ammonia water under the stirring condition to enable the pH value to be 8-11, then adding tetraethoxysilane, reacting for 3-5h at 30-50 ℃, and magnetically separating to obtain silicon dioxide coated ferroferric oxide particles;

(3) mixing low-density polyethylene, organic silicon resin, divinyl benzene, o-methylbenzene glycol, a plasticizer, caprolactam, cellulose nanocrystal, an antistatic agent, ethylene glycol lauric acid amide, sodium silicate, caprolactam, carbon black, calcium oxide and viscose in a mixer at 60-80 ℃ for 1-3 hours until the mixture is uniform to obtain a first mixture;

(4) adding the mixture I, a stabilizer, polydopamine and a lubricant into a reaction kettle, and stirring and reacting for 3-5 hours at the temperature of 85-95 ℃ under the protection of inert gas to obtain a mixture II;

(5) adding barium stearate and an antioxidant into the second mixture, stirring and mixing uniformly, and heating, melting and stirring at the temperature of 200-220 ℃ in a high-speed mixer to obtain a polymerization mixture;

(6) adding the silicon dioxide coated ferroferric oxide particles prepared in the step (2) into the prepared polymerization mixture, and stirring for 1-2h at the rotating speed of 100-140r/min to uniformly disperse the silicon dioxide coated on the surfaces of the ferroferric oxide particles in the polymerization mixture; and then placing the mixture in a mold, curing the mixture by adopting a step heating method after vacuum defoaming, and then cooling the mixture to room temperature to obtain the magnetic plastic.

8. The method as claimed in claim 7, wherein the step-up temperature curing in step (6) is performed under the conditions of 200-210 ℃ for 2-4h, 220 ℃ for 1-3h, and 230 ℃ for 1-2 h.

Technical Field

The invention relates to the technical field of material science, in particular to a magnetic plastic and a preparation method thereof.

Background

The magnetic plastic mainly refers to a plastic product with magnetism, has the characteristics of small density, high impact strength and the like, can be subjected to cutting, drilling, welding, laminating, embossing and other processing, and is widely applied to various fields of electronics, electrics, instruments and meters, communication, culture and education, medical sanitation and daily life. Meanwhile, the electromagnetic device can be processed into a product with high dimensional accuracy, thin wall and complex properties, and can be used for forming a product with an insert, thereby realizing the miniaturization, light weight, precision and high performance of the electromagnetic device. Therefore, in some new fields, sintered magnets are gradually being replaced by magnetic plastics. Meanwhile, the magnetic plastic has lower energy consumption than a sintered magnet, and completely conforms to the strategic deployment of the national society of resource conservation and environmental friendliness. The development of magnetic plastics in China is late, but the development is rapid in recent years, the magnetic plastics have already entered the practical stage, and the magnetic plastics are widely used in the fields of aerospace, automobiles, color TV, computers, copiers and the like. In the aspects of computer floppy drive motors, copier developing rollers, fixing rollers, automobile integrated instruments, manipulators, control elements of robots and the like, magnetic plastics have replaced traditional sintered magnets.

However, most of the existing magnetic plastics are compounded by directly adding magnetic powder into plastics, but the magnetic powder is poorly combined with a plastic body, so that the performance of the magnetic plastics is unstable; or the powder is easy to agglomerate in the plastic body and has poor dispersibility, so that the magnetic plastic is not uniform.

Disclosure of Invention

The invention aims to provide a magnetic plastic with uniform and stable components and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the magnetic plastic is composed of the following raw materials in parts by weight: 20-40 parts of low-density polyethylene, 15-25 parts of divinylbenzene, 6-8 parts of silicon dioxide coated ferroferric oxide particles, 3-5 parts of o-methylbenzene glycol, 4-6 parts of plasticizer, 1-2 parts of caprolactam, 1-2 parts of cellulose nanocrystal, 3-4 parts of antistatic agent, 2-4 parts of viscose, 1-2 parts of stabilizer, 2-4 parts of ethylene glycol lauric acid amide, 2-4 parts of sodium silicate, 4-8 parts of calcium oxide, 3-5 parts of polydopamine, 2-4 parts of barium stearate, 1-3 parts of caprolactam, 3-5 parts of carbon black, 5-15 parts of organic silicon resin, 3-5 parts of lubricant and 2-4 parts of antioxidant.

As a further scheme of the invention: the magnetic plastic is prepared from the following raw materials in parts by weight: 25-35 parts of low-density polyethylene, 18-22 parts of divinylbenzene, 6.5-7.5 parts of silicon dioxide coated ferroferric oxide particles, 3.5-4.5 parts of o-methylbenzene glycol, 4.5-5.5 parts of plasticizer, 1.2-1.8 parts of caprolactam, 1.2-1.8 parts of cellulose nanocrystal, 3.2-3.8 parts of antistatic agent, 2.5-3.5 parts of viscose fiber, 1.2-1.8 parts of stabilizer, 2.5-3.5 parts of ethylene glycol lauric acid amide, 2.5-3.5 parts of sodium silicate, 5-7 parts of calcium oxide, 3.5-4.5 parts of polydopamine, 2.5-3.5 parts of barium stearate, 1.5-2.5 parts of caprolactam, 3.5-4.5 parts of carbon black, 8-12 parts of organic silicon resin, 3.5-4.5 parts of lubricant and 2.5-3.5 parts of antioxidant.

As a further scheme of the invention: the magnetic plastic is prepared from the following raw materials in parts by weight: 30 parts of low-density polyethylene, 20 parts of divinylbenzene, 7 parts of silicon dioxide coated ferroferric oxide particles, 4 parts of o-methylbenzene glycol, 5 parts of plasticizer, 1.5 parts of caprolactam, 1.5 parts of cellulose nanocrystal, 3.5 parts of antistatic agent, 3 parts of viscose, 1.5 parts of stabilizer, 3 parts of ethylene glycol lauric acid amide, 3 parts of sodium silicate, 6 parts of calcium oxide, 4 parts of polydopamine, 3 parts of barium stearate, 2 parts of caprolactam, 4 parts of carbon black, 10 parts of organic silicon resin, 4 parts of lubricant and 3 parts of antioxidant.

As a further scheme of the invention: the lubricant is any one of pentaerythritol stearate, oxidized polyethylene wax, polyethylene wax or polypropylene wax.

As a further scheme of the invention: the antioxidant is antioxidant 1010 or antioxidant 168 or antioxidant TNP.

As a further scheme of the invention: the plasticizer is one of DEHP, DOP and DBP.

The preparation method of the magnetic plastic comprises the following specific steps:

(1) weighing the raw materials in parts by weight;

(2) synthesizing ferroferric oxide nanoparticles by a coprecipitation method, taking magnetic ferroferric oxide nanoparticles, ultrasonically dispersing the magnetic ferroferric oxide nanoparticles in a solvent, dropwise adding ammonia water under the stirring condition to enable the pH value to be 8-11, then adding tetraethoxysilane, reacting for 3-5h at 30-50 ℃, and magnetically separating to obtain silicon dioxide coated ferroferric oxide particles;

(3) mixing low-density polyethylene, organic silicon resin, divinyl benzene, o-methylbenzene glycol, a plasticizer, caprolactam, cellulose nanocrystal, an antistatic agent, ethylene glycol lauric acid amide, sodium silicate, caprolactam, carbon black, calcium oxide and viscose in a mixer at 60-80 ℃ for 1-3 hours until the mixture is uniform to obtain a first mixture;

(4) adding the mixture I, a stabilizer, polydopamine and a lubricant into a reaction kettle, and stirring and reacting for 3-5 hours at the temperature of 85-95 ℃ under the protection of inert gas to obtain a mixture II;

(5) adding barium stearate and an antioxidant into the second mixture, stirring and mixing uniformly, and heating, melting and stirring at the temperature of 200-220 ℃ in a high-speed mixer to obtain a polymerization mixture;

(6) adding the silicon dioxide coated ferroferric oxide particles prepared in the step (2) into the prepared polymerization mixture, and stirring for 1-2h at the rotating speed of 100-140r/min to uniformly disperse the silicon dioxide coated on the surfaces of the ferroferric oxide particles in the polymerization mixture; and then placing the mixture in a mold, curing the mixture by adopting a step heating method after vacuum defoaming, and then cooling the mixture to room temperature to obtain the magnetic plastic.

As a still further scheme of the invention: the step heating method in the step (6) is specifically cured at 210 ℃ for 2-4h at 200-.

Compared with the prior art, the invention has the beneficial effects that:

the invention has the advantages of uniform and stable components, moisture resistance, corrosion resistance, magnetic material function, excellent physical and chemical properties, excellent mechanical properties, excellent processing performance, simple production process, low cost, light and convenient material, easy processing and wide application in the fields of electronics, photoelectricity, communication, life and the like.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.