CN112143191B - Magnetic plastic and preparation method thereof - Google Patents
Magnetic plastic and preparation method thereof Download PDFInfo
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- CN112143191B CN112143191B CN202011073041.5A CN202011073041A CN112143191B CN 112143191 B CN112143191 B CN 112143191B CN 202011073041 A CN202011073041 A CN 202011073041A CN 112143191 B CN112143191 B CN 112143191B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/06—Unsaturated polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/01—Magnetic additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
Abstract
The application discloses a magnetic plastic and a preparation method thereof. The magnetic plastic comprises the following components: 8289 parts by weight of unsaturated polyester resin 6.30-6.70 parts; 8901 parts by weight of a low-shrinkage resin (3.30-3.70); 0.11-0.13 parts by weight of a curing agent; 0.030-0.040 parts by weight of a polymerization inhibitor; 19.50-20.50 parts by weight of neodymium iron boron powder; 2.30-2.70 parts by weight of silicon micropowder; 0.48 to 0.52 parts by weight of a mold release agent; 0.017-0.023 parts by weight of magnesium oxide; and 3.80 to 4.20 parts by weight of chopped glass fiber. The magnetic plastic has high magnetism and mechanical strength, and also has very good plasticity. In addition, the preparation method is simple, convenient and quick to operate, does not need harsh conditions such as high temperature and high pressure, and is high in processing speed, production efficiency and molding qualification rate.
Description
Technical Field
The application relates to the field of functional plastics, in particular to a magnetic plastic and a preparation method thereof.
Background
Magnetic plastics, as the name implies, refer to plastic products that are magnetic. Magnetic plastics are a novel high-molecular functional material developed in the seventies and are one of important basic materials in the field of modern science and technology. The magnetic plastic can be divided into a structural type and a composite type according to the components, the structural type magnetic plastic refers to a magnet with strong magnetism of a polymer, and the magnet is difficult to research and develop and has high cost; the composite magnetic plastic is a magnet which is prepared by mixing, bonding and processing plastic or rubber serving as an adhesive and magnetic powder, and the magnetic powder serves as a magnetic source.
Compared with sintered magnetic material, the magnetic plastic has low density, certain impact resistance, controllable magnetic powder content, high chemical stability, capacity of being cut, drilled, welded, laminated, etc. and no cracking. The method can be used for processing by common plastic general processing methods (such as injection, die pressing, extrusion and the like), has unique advantages in the aspects of preparing thin walls, complex shapes, radial orientation, high-precision magnets, realizing integrated combination forming and the like, has the characteristics of high material utilization rate, high production efficiency and the like, and plays a key role in miniaturization, light weight, compounding, high efficiency and energy conservation of electronic components. Magnetic plastics can be used in many devices. Such as audio-video equipment, household appliances, computers, and office, machinery, automobile industry, medical treatment and health, cultural goods, etc.
However, the magnetic plastic still has the problems of low magnetism, uneven magnetic distribution, further improved mechanical strength, poor compatibility between the magnetic powder and the plastic or rubber, and the like, and needs to be improved by those skilled in the art.
Disclosure of Invention
[ problem ] to
In view of the deficiencies of the prior art, it is an object of the present application to provide a magnetic plastic. The magnetic plastic has high magnetism, excellent mechanical strength, very good plasticity, stable performance and low cost, and is convenient to process.
Another objective of the present application is to provide a method for preparing the above magnetic plastic, wherein the method is simple, convenient and fast to operate, does not require harsh conditions such as high temperature and high pressure, has a fast processing speed, high production efficiency and high molding yield, and can fully take into account the magnetism of the magnetic powder and the mechanical properties of the plastic, so that both the magnetism and the mechanical properties of the plastic are optimal.
[ solution ]
In order to achieve the above object, according to one embodiment of the present application, there is provided a magnetic plastic comprising the following components:
in the application, neodymium iron boron powder with magnetism is bonded by adopting two different types of resins, and is matched with silicon micropowder, magnesium oxide, chopped glass fiber and the like, so that the neodymium iron boron powder can be fully dispersed in magnetic plastics, strong and uniform magnetism is shown, such as high coercive force, maximum magnetic energy product, magnetic flux density and the like, and the magnetic plastics are also enabled to have higher mechanical strength, such as compressive strength, tensile strength, elongation at break, impact resistance and the like.
Preferably, the magnetic plastic comprises the following components:
at the above component ratio, the magnetic plastic prepared by the method can show more excellent magnetism and mechanical strength.
Further, the magnetic plastic further comprises: 1.45-1.55 parts by weight of nickelocene, 2.90-3.10 parts by weight of ferrocene and 1.35-1.45 parts by weight of 2,2' -diallyl bisphenol A. Preferably, the magnetic plastic further comprises: 1.50 parts by weight of nickelocene, 3.00 parts by weight of ferrocene and 1.40 parts by weight of 2,2' -diallylbisphenol A. In the application, the nickelocene and the ferrocene can be modified and combined on the surface of the neodymium iron boron powder, so that the coercive force, the maximum magnetic energy product, the magnetic flux density and the like of the magnetic plastic are further improved, and the neodymium iron boron powder can be more fully dispersed in the magnetic plastic by adding the 2,2' -diallyl bisphenol A, so that the magnetism of each part is kept consistent.
Preferably, the weight ratio of the nickelocene to the ferrocene is 1: 2. At this weight ratio, the effectiveness of nickelocene and ferrocene can be optimized.
Further, the curing agent may be tert-butyl peroxybenzoate (TBPB). The curing agent can be used for effectively curing the magnetic plastic into required properties.
Further, the polymerization inhibitor may be p-benzoquinone (PBQ). The polymerization inhibitor can properly delay the crosslinking and curing rate among resins and provide enough time for processing the magnetic plastics.
Preferably, the p-benzoquinone can be used after being prepared as a 5 to 15 wt%, preferably 10 wt% styrene solution. The magnetic plastic is dissolved in styrene for use, so that the benzoquinone is conveniently and fully dispersed in resin, and the polymerization inhibition effect is exerted in a balanced manner, so that the curing of the magnetic plastic can be synchronously performed on all parts, and the mechanical property is fully improved.
Furthermore, the particle size of the silicon micro powder (quartz powder) can be 550-650 meshes, preferably 600 meshes, and the particle size of the magnesium oxide can be 550-650 meshes, preferably 600 meshes. Under the granularity, the silicon micropowder can be matched with magnesium oxide, so that the mechanical strength of the material, such as compressive strength, is further improved.
Further, the release agent may be zinc stearate. The release agent can avoid the adhesion of magnetic plastics and a mould, and is convenient to release after the materials are cured and take out.
Further, the chopped glass fibers may have a length of 3 mm. Under the length, the magnetic plastic can be fully reinforced, so that the magnetic plastic has better tensile strength and impact resistance.
According to another embodiment of the present application, there is provided a method for preparing the above magnetic plastic, including the steps of:
(1) preparation of resin paste: mixing and dispersing 8289 type unsaturated polyester resin, 8901 type low-shrinkage resin, a curing agent and a polymerization inhibitor;
(2) kneading and stirring the powder: mixing neodymium iron boron powder, silicon micropowder, a release agent and magnesium oxide, kneading and stirring;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), and stirring and kneading the mixture in a clockwise and anticlockwise overlapping manner; and
(4) and (4) clockwise rotating and stirring the product obtained in the step (3), adding the chopped glass fibers, and then continuing kneading and stirring.
In the application, the components are mixed/kneaded in batches and stirred to prepare the magnetic plastic according to the application without harsh conditions such as high temperature and high pressure, the conditions are mild and easy to operate, the method is simple, convenient and quick, harsh conditions such as high temperature and high pressure are not required, the processing speed is high, the production efficiency is high, and the molding qualification rate is high. After the processing is finished, the material is injected into the mold and cured to obtain the product with the required structure.
Further, the preparation method comprises the step (2) of adding 1.45-1.55 parts by weight of nickelocene, 2.90-3.10 parts by weight of ferrocene and 1.35-1.45 parts by weight of 2,2' -diallyl bisphenol A. Preferably, the preparation method further comprises the step (2) of adding 1.50 parts by weight of nickelocene, 3.00 parts by weight of ferrocene and 1.40 parts by weight of 2,2' -diallyl bisphenol A. In the application, the nickelocene, the ferrocene and the 2,2' -diallyl bisphenol A are added, so that the magnetism and the mechanical property of the magnetic plastic can be better and simultaneously improved, the operation is simple and convenient, and the effect is obvious.
Further, in the step (1), the mixing and dispersing may be carried out at a stirring speed of 900 to 1100 rpm, preferably 1000 rpm, for 12 to 18 minutes, preferably 15 minutes. Under the mixing and dispersing operation conditions, the resin, the curing agent, the polymerization inhibitor and the like may be stirred, mixed and mixed uniformly.
Further, in the step (2), the kneading and stirring may be performed at a stirring speed of 65 to 75 rpm, preferably 70 rpm, for 20 to 25 minutes, preferably 22 minutes. Under the kneading and stirring operation conditions, the respective powders can be sufficiently stirred and mixed into a uniform state.
Further, in the step (3), the mixture is stirred clockwise for 8 to 12 minutes, preferably 10 minutes, at a stirring speed of 85 to 95 revolutions per minute, preferably 90 revolutions per minute, and then stirred counterclockwise for 8 to 12 minutes, preferably 10 minutes. Through clockwise and anticlockwise overlap stirring, can make resin paste and powder fully contact, avoid appearing the local inhomogeneous condition of mixing, especially neodymium iron boron powder is inhomogeneous.
Further, in the step (4), the chopped glass fibers are added at a stirring speed of 85 to 95 revolutions per minute, preferably 90 revolutions per minute, and then kneaded and stirred for 6 to 10 minutes, preferably 8 minutes. The chopped glass fibers can be sufficiently impregnated by stirring and kneading, and the impact resistance of the material can be improved.
[ advantageous effects ]
In summary, the present application has the following beneficial effects:
according to the magnetic plastic, the neodymium iron boron powder is fully dispersed in the magnetic plastic, strong and uniform magnetism is shown, such as high coercive force, maximum magnetic energy product, magnetic flux density and the like, and the magnetic plastic is enabled to have high mechanical strength, such as compressive strength, tensile strength, elongation at break, impact resistance and the like. Therefore, the magnetic plastic can be used for preparing various magnets and the like, and has stable performance and low cost.
In addition, the preparation method of the magnetic plastic is simple, convenient and fast to operate, does not need harsh conditions such as high temperature and high pressure, is high in processing speed, production efficiency and molding qualification rate, and can fully take the magnetism of the magnetic powder and the mechanical property of the plastic into consideration, so that the magnetism and the mechanical property of the plastic are optimal.
Detailed Description
In order that those skilled in the art can more clearly understand the present application, the present application will be described in further detail with reference to the following examples, but it should be understood that the following examples are only preferred embodiments of the present application, and the scope of the present application as claimed is not limited thereto.
Sources of materials
8289 type unsaturated polyester resin, 8901 type low shrinkage resin, available from Xinshubili (Huizhou) resins, Inc.;
tert-butyl peroxybenzoate (TBPB), available from Jiangsu crystallized space New Material science and technology Co., Ltd;
p-benzoquinone (PBQ), available from Shanghai Michelin Biochemical technology, Inc.;
neodymium iron boron powder purchased from fertilizer and magnet containing company Limited;
silicon micropowder, purchased from qing yuan xin hui chemical ltd;
magnesium oxide, purchased from Yingkou Tianyi energy chemical Co., Ltd;
zinc stearate, available from chemical reagents ltd, wungjiang, guangdong;
chopped glass fibers, available from chemical Limited of Waverrucke, Beijing;
nickelocene, ferrocene, available from Shanghai Ji to Biochemical technology, Inc.; and
2,2' -diallyl bisphenol A, available from carbofuran technologies, Inc.
< example >
Example 1
The following preparation methods were used to prepare the magnetic plastics according to the application:
(1) preparation of resin paste: 6.50kg of 8289 type unsaturated polyester resin, 3.50kg of 8901 type low shrinkage resin, 0.12kg of curing agent tert-butyl peroxybenzoate and 0.035kg of polymerization inhibitor p-benzoquinone (dissolved in 0.315kg of styrene) were mixed and dispersed for 15 minutes at a stirring speed of 1000 rpm;
(2) kneading and stirring the powder: mixing 20.00kg of neodymium iron boron powder, 2.50kg of silicon micropowder (600 meshes), 0.50kg of release agent zinc stearate and 0.020kg of magnesium oxide (600 meshes), and kneading for 22 minutes at a stirring speed of 70 revolutions per minute;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), clockwise stirring and kneading for 10 minutes at a stirring speed of 90 revolutions per minute, and then anticlockwise stirring and kneading for 10 minutes; and
(4) the resultant of step (3) was stirred while rotating clockwise at a stirring speed of 90 revolutions per minute, 4.00kg of chopped glass fibers (3 mm in length) were added, followed by kneading and stirring for 8 minutes.
Thus, the magnetic plastic according to the present application is obtained.
Example 2
The following preparation methods were used to prepare the magnetic plastics according to the application:
(1) preparation of resin paste: 6.70kg of 8289 type unsaturated polyester resin, 3.70kg of 8901 type low shrinkage resin, 0.11kg of curing agent tert-butyl peroxybenzoate and 0.040kg of polymerization inhibitor p-benzoquinone (dissolved in 0.160kg of styrene) were mixed and dispersed for 18 minutes at a stirring speed of 900 rpm;
(2) kneading and stirring the powder: mixing 19.50kg of neodymium iron boron powder, 2.70kg of silicon micropowder (550 meshes), 0.52kg of release agent zinc stearate and 0.017kg of magnesium oxide (650 meshes), and kneading for 20 minutes at a stirring speed of 75 revolutions per minute;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), clockwise stirring and kneading for 12 minutes at a stirring speed of 85 revolutions per minute, and then anticlockwise stirring and kneading for 8 minutes; and
(4) the resultant of step (3) was stirred while rotating clockwise at a stirring speed of 95 revolutions per minute, 3.80kg of chopped glass fibers (3 mm in length) were added, followed by kneading and stirring for 6 minutes.
Thus, the magnetic plastic according to the present application is obtained.
Example 3
The following preparation methods were used to prepare the magnetic plastics according to the application:
(1) preparation of resin paste: 6.30kg of 8289 type unsaturated polyester resin, 3.30kg of 8901 type low shrinkage resin, 0.13kg of curing agent tert-butyl peroxybenzoate and 0.030kg of polymerization inhibitor p-benzoquinone (dissolved in 0.420kg of styrene) were mixed and dispersed for 12 minutes at a stirring speed of 1100 rpm;
(2) kneading and stirring the powder: mixing 20.50kg of neodymium iron boron powder, 2.30kg of silicon micropowder (650 meshes), 0.48kg of release agent zinc stearate and 0.023kg of magnesium oxide (550 meshes), and kneading for 25 minutes at a stirring speed of 65 revolutions per minute;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), clockwise stirring and kneading for 8 minutes at a stirring speed of 95 revolutions per minute, and then anticlockwise stirring and kneading for 12 minutes; and
(4) the resultant of step (3) was stirred while rotating clockwise at a stirring speed of 85 rpm, 4.20kg of chopped glass fibers (3 mm in length) were added, followed by kneading and stirring for 10 minutes.
Thus, the magnetic plastic according to the present application is obtained.
Example 4
A magnetic plastic according to the present application was produced in the same manner as in example 1, except that 1.50kg of nickelocene, 3.00kg of ferrocene and 1.40kg of 2,2' -diallylbisphenol A were further added in step (2).
Example 5
The following preparation methods were used to prepare the magnetic plastics according to the application:
(1) preparation of resin paste: 6.30kg of 8289 type unsaturated polyester resin, 3.70kg of 8901 type low shrinkage resin, 0.11kg of curing agent tert-butyl peroxybenzoate and 0.040kg of polymerization inhibitor p-benzoquinone (dissolved in 0.360kg of styrene) were mixed and dispersed for 15 minutes at a stirring speed of 1100 rpm;
(2) kneading and stirring the powder: mixing 19.50kg of neodymium iron boron powder, 2.70kg of silicon micropowder (600 meshes), 0.48kg of release agent zinc stearate, 0.023kg of magnesium oxide (650 meshes), 1.45kg of nickelocene, 2.90kg of ferrocene and 1.35kg of 2,2' -diallyl bisphenol A, and kneading for 20 minutes at a stirring speed of 75 revolutions per minute;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), clockwise stirring and kneading for 8 minutes at a stirring speed of 95 revolutions per minute, and then anticlockwise stirring and kneading for 8 minutes; and
(4) the resultant of step (3) was stirred while rotating clockwise at a stirring speed of 95 revolutions per minute, 4.20kg of chopped glass fibers (3 mm in length) were added, followed by kneading and stirring for 7 minutes.
Thereby, the magnetic plastic according to the present application is produced.
Example 6
The following preparation methods were used to prepare the magnetic plastics according to the application:
(1) preparation of resin paste: 6.70kg of 8289 type unsaturated polyester resin, 3.30kg of 8901 type low shrinkage resin, 0.13kg of curing agent tert-butyl peroxybenzoate and 0.030kg of polymerization inhibitor p-benzoquinone (dissolved in 0.320kg of styrene) are mixed and dispersed for 18 minutes at a stirring speed of 900 r/min;
(2) kneading and stirring the powder: mixing 20.50kg of neodymium iron boron powder, 2.30kg of silicon micropowder (550 meshes), 0.52kg of release agent zinc stearate, 0.017kg of magnesium oxide (600 meshes), 1.55kg of nickelocene, 3.10kg of ferrocene and 1.45kg of 2,2' -diallyl bisphenol A, and kneading for 25 minutes at a stirring speed of 70 revolutions per minute;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), and stirring and kneading the mixture for 12 minutes clockwise at a stirring speed of 85 revolutions per minute, and then stirring and kneading the mixture for 12 minutes anticlockwise; and
(4) the resultant of step (3) was stirred while rotating clockwise at a stirring speed of 85 revolutions per minute, 3.80kg of chopped glass fibers (3 mm in length) were added, followed by kneading and stirring for 10 minutes.
Thus, the magnetic plastic according to the present application is obtained.
Comparative example 1
The following preparation method was used to prepare the magnetic plastics:
(1) preparation of resin paste: 6.00kg of 8289 type unsaturated polyester resin, 4.00kg of 8901 type low shrinkage resin, 0.10kg of curing agent tert-butyl peroxybenzoate and 0.050kg of polymerization inhibitor p-benzoquinone (dissolved in 0.450kg of styrene) are mixed and dispersed for 10 minutes at a stirring speed of 1200 r/min;
(2) kneading and stirring the powder: mixing 19.00kg of neodymium iron boron powder, 2.90kg of silicon micropowder (600 meshes), 0.45kg of release agent zinc stearate and 0.025kg of magnesium oxide (650 meshes), and kneading for 30 minutes at a stirring speed of 60 revolutions per minute;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), clockwise stirring and kneading for 6 minutes at a stirring speed of 100 revolutions per minute, and then anticlockwise stirring and kneading for 6 minutes; and
(4) the resultant of step (3) was stirred while rotating clockwise at a stirring speed of 80 revolutions per minute, 3.50kg of chopped glass fibers (3 mm in length) were added, followed by kneading and stirring for 15 minutes.
Thus, a magnetic plastic was obtained.
Comparative example 2
The following preparation method was used to prepare the magnetic plastics:
(1) preparation of resin paste: 7.00kg of 8289 type unsaturated polyester resin, 3.00kg of 8901 type low shrinkage resin, 0.15kg of curing agent tert-butyl peroxybenzoate and 0.020kg of polymerization inhibitor p-benzoquinone (dissolved in 0.180kg of styrene) were mixed and dispersed for 20 minutes at a stirring speed of 800 rpm;
(2) kneading and stirring the powder: mixing 21.00kg of neodymium iron boron powder, 2.10kg of silicon micropowder (550 meshes), 0.55kg of release agent zinc stearate and 0.015kg of magnesium oxide (600 meshes), and kneading for 15 minutes at a stirring speed of 80 revolutions per minute;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), clockwise stirring and kneading for 12 minutes at a stirring speed of 80 revolutions per minute, and then anticlockwise stirring and kneading for 12 minutes; and
(4) the product obtained in step (3) was stirred while rotating clockwise at a stirring speed of 100 rpm, 4.50kg of chopped glass fibers (3 mm in length) were added, followed by kneading and stirring for 5 minutes.
Thus, a magnetic plastic was produced.
< test examples >
The properties of the magnetic plastics obtained in examples 1 to 6 and comparative examples 1 and 2 after curing were measured, and the results are shown in the following table 1:
[ Table 1]
As can be seen from table 1 above, the magnetic plastics prepared according to examples 1 to 3 of the present application have higher coercive force, maximum magnetic energy product, magnetic flux density, and compressive strength, tensile strength, elongation at break, impact strength, etc., thereby exhibiting excellent magnetic and mechanical properties; in addition, the magnetic plastic prepared according to the embodiments 4 to 6 of the present application further improves the magnetic and mechanical properties by adding the nickel dicyclopentadienyl, the ferrocene and the 2,2' -diallyl bisphenol A which are matched with each other.
In contrast, comparative examples 1 and 2 are significantly inferior to those of the present application in terms of magnetic and mechanical properties, etc., due to the use of the component distribution ratio and the production conditions outside the range defined in the present application.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A magnetic plastic, comprising the following components:
8289 parts by weight of unsaturated polyester resin 6.30-6.70 parts;
3.30-3.70 parts by weight of 8901 type low-shrinkage resin;
0.11-0.13 parts by weight of a curing agent;
0.030-0.040 parts by weight of a polymerization inhibitor;
19.50-20.50 parts by weight of neodymium iron boron powder;
2.30-2.70 parts by weight of silicon micropowder;
0.48-0.52 parts by weight of a release agent;
0.017-0.023 parts by weight of magnesium oxide;
3.80-4.20 parts by weight of chopped glass fiber;
1.45-1.55 parts of nickel chloride;
2.90-3.10 parts by weight of ferrocene;
1.35-1.45 parts by weight of 2,2' -diallyl bisphenol A.
2. The magnetic plastic according to claim 1, characterized in that it comprises the following components:
8289 type unsaturated polyester resin 6.50 parts by weight;
8901 type low shrinkage resin 3.50 weight parts;
0.12 part by weight of curing agent;
0.035 weight portions of polymerization inhibitor;
20.00 parts of neodymium iron boron powder;
2.50 parts of silicon micropowder;
0.50 part by weight of a release agent;
0.020 part by weight of magnesium oxide;
4.00 parts by weight of chopped glass fibers;
1.45-1.55 parts of nickel chloride;
2.90-3.10 parts by weight of ferrocene;
1.35-1.45 parts by weight of 2,2' -diallyl bisphenol A.
3. The magnetic plastic according to claim 1 or 2, wherein the weight ratio of the nickelocene to the ferrocene is 1: 2.
4. A magnetic plastic according to claim 1 or 2,
the curing agent is tert-butyl peroxybenzoate;
the polymerization inhibitor is p-benzoquinone;
the release agent is zinc stearate.
5. The magnetic plastic of claim 4, wherein the p-benzoquinone is used after being prepared as a 5-15 wt% styrene solution.
6. A magnetic plastic according to claim 1 or 2,
the granularity of the silicon micro powder is 550-650 meshes;
the particle size of the magnesium oxide is 550-650 meshes;
the length of the chopped glass fiber is 3 mm.
7. A method for preparing a magnetic plastic according to any one of claims 1 to 6, characterized in that it comprises the following steps:
(1) preparation of resin paste: mixing and dispersing 8289 type unsaturated polyester resin, 8901 type low-shrinkage resin, a curing agent and a polymerization inhibitor;
(2) kneading and stirring the powder: mixing neodymium iron boron powder, silicon micropowder, a release agent, magnesium oxide, nickelocene, ferrocene and 2,2' -diallyl bisphenol A, kneading and stirring;
(3) adding the resin paste prepared in the step (1) into the kneaded powder obtained in the step (2), and stirring and kneading the mixture in a clockwise and anticlockwise overlapping manner; and
(4) and (4) clockwise rotating and stirring the product obtained in the step (3), adding the chopped glass fibers, and then continuing kneading and stirring.
8. The production method according to claim 7,
in the step (1), the mixing and dispersing are carried out for 12-18 minutes at a stirring speed of 900-1100 r/min;
in the step (2), the kneading and stirring are carried out for 20-25 minutes at a stirring speed of 65-75 revolutions per minute;
the step (3) is that the mixture is stirred clockwise for 8-12 minutes at a stirring speed of 85-95 revolutions per minute and then is stirred anticlockwise for 8-12 minutes;
and the step (4) is to add the chopped glass fibers at a stirring speed of 85-95 revolutions per minute, and then kneading and stirring for 6-10 minutes.
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