CN105130417B - A kind of pellet of injection moulding varistor and preparation method thereof - Google Patents
A kind of pellet of injection moulding varistor and preparation method thereof Download PDFInfo
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- CN105130417B CN105130417B CN201510521138.0A CN201510521138A CN105130417B CN 105130417 B CN105130417 B CN 105130417B CN 201510521138 A CN201510521138 A CN 201510521138A CN 105130417 B CN105130417 B CN 105130417B
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Abstract
The invention discloses a kind of pellet of injection moulding varistor and preparation method thereof, the pellet includes each component of following percentage by weight：Powder 70% 95%, binding agent 5% 30%；The powder includes each component of following percentage by weight：Zinc Oxide 85% 95%, additive 5% 15%；The binding agent includes each component of following percentage by weight：Paraffin 30% 88%, polymethyl methacrylate 5% 30%, ethylene-vinyl acetate copolymer 5% 30%, stearic acid 2% 10%.Using the pellet injection mo(u)lding of injection moulding varistor of the present invention, varistor shaped inner stress is solved the problems, such as well, product stripping is not in losing angle phenomenon, also guaranteed to the concordance of product；And the varistor density that produced with which is big, density is homogeneous, mechanical strength is high.
Description
Technical field
The present invention relates to varistor forming field, the pellet and its system of more particularly to a kind of injection moulding varistor
Preparation Method.
Background technology
The production Technology of traditional pressure sensitive resistance is mainly dry pressing.Have many good qualities：Such as production efficiency height, people
Work is less, percent defective is low, with short production cycle, and the extrudate density of production is big, intensity is high, is adapted to mass industrialized production.Shortcoming
It is that the shape of shaped article has larger restriction, blank strength is low, and base substrate interior solid is inconsistent, the uniformity phase of organizational structure
To poor etc..Again due to the dry-pressing formed varistor that can only typically produce simple structure, for complicated varistor, dry-pressing
Molding typically disposably can not be completed, and needs are completed by other techniques and equipment, are so not only increased operation, and be increased
Production cost and time, the concordance of product also there is no guarantee that.Injection mo(u)lding can solve the problems, such as this respect well, not only
The varistor of simple structure can be disposably produced, baroque varistor can also be disposably produced；It is molded simultaneously
The product blank strength of molding is very high, and production is carried in removing way will not be damaged, and interiors of products does not have stress, the density of product
Greatly, density is homogeneous, and more than ten product even tens product can be disposably produced in production, and production efficiency is greatly improved.
But it is not suitable for the pellet that injection moulding produces varistor, and the preparation method of such pellet at present.
The content of the invention
The technical problem to be solved is to provide a kind of pellet of injection moulding varistor and its preparation side
Method.
The technical problem of the present invention is solved by following technical scheme：
A kind of pellet of injection moulding varistor, including each component of following percentage by weight：
Powder 70%-95%
Binding agent 5%-30%；
The powder includes each component of following percentage by weight：
Zinc Oxide 85%-95%
Additive 5%-15%；
The additive includes each component of following percentage by weight：
The binding agent includes each component of following percentage by weight：
According to embodiment, following preferred technical scheme can be also adopted：
The percentage by weight of the powder is 80%, and the percentage by weight of the binding agent is 20%.
The powder includes the Zinc Oxide that percentage by weight is 90%, and percentage by weight is 10% additive.
The additive includes each component of following percentage by weight：
The binding agent includes each component of following percentage by weight：
The paraffin is paraffin wax fully refined.
A kind of preparation method of the pellet of described injection moulding varistor, comprises the steps：
1) prepare binding agent：By heating paraffin to 120 DEG C -200 DEG C after paraffin all melts, polymethylacrylic acid is added
Methyl ester and ethylene-vinyl acetate copolymer, and stir to after all dissolving, stearic acid is added, binding agent is obtained；
2) prepare powder：Zinc Oxide and additive are uniformly mixed by agitating ball mill, then calcined, wait to calcine
The powder of certain particle size is milled to after complete with ball mill；
3) banburying of powder and binding agent：Powder drying is subsequently cooled to into room temperature first, then by itself and the step
1) binding agent for obtaining banburying in banbury, obtains cake mass；
4) crushing of cake mass：The cake mass is crushed to into the pellet of appropriate particle diameter.
According to embodiment, following preferred technical scheme can be also adopted：
The step 2) in：The rotating speed of the agitating ball mill is 30r/min-60r/min, and Ball-milling Time is 30h-50h；
The temperature of the calcining is 500 DEG C -700 DEG C, and calcination time is 1h-3h；The certain particle size refers to 0.5 μm -2.0 μm.
The step 3) in：The temperature of the drying is 80 DEG C -150 DEG C, and drying time is 1h-2h；The room temperature is referred to
20℃-30℃；Described mixing temperature is 120 DEG C -200 DEG C in banbury during banburying, and the frequency of the agitator of banbury is
25Hz-65Hz, mixing time are 60min-120min.
The step 4) it is specially：The cake mass is crushed to into the grain that mean diameter is 3mm～8mm with pulverizer
Material.
Beneficial effects of the present invention include：The present invention pellet suitable for preparing varistor by injection molding technique,
The pellet preparation method of the present invention can produce satisfactory pellet, keep the uniform concordance of pellet, to be injected into
Type is prepared.Using the pellet injection moulding varistor of the present invention, varistor shaped inner stress is solved well
Problem, product stripping are not in losing angle phenomenon, also guaranteed to the concordance of product；And the varistor produced with which
Density is big, density is homogeneous, mechanical strength is high, can disposably produce tens products in production, and production efficiency is greatly improved.
Specific embodiment
With reference to preferred embodiment the invention will be further described.
The invention provides a kind of pellet of injection moulding varistor, including binding agent and powder, wherein binding agent
Including paraffin, polymethyl methacrylate, ethylene-vinyl acetate copolymer, stearic acid；Powder includes Zinc Oxide and additive.
Binding agent is a kind of carrier for existing in short-term, and it can make powder filling even into required form, and make this
Shape is always maintained at sintering and starts.Although binding agent does not determine the chemical composition of final products, it can directly affect work
Skill success, binding agent must be mixed into the uniform feeding for injection moulding with powder.
Paraffin has that fusing point is low, wellability is good, strand is short, the low advantage of viscosity, and paraffin is flowed in the state of melting
Dynamic property is good, and simple powder does not have good mobility in injector, in the paraffin and other bondings of melting
Just there is under the drive of agent mobility, being capable of injection moulding.And paraffin is volatile, be conducive to defat.But using single
Paraffinic components injection moulding, product strength are low, and paraffin melting point scope is narrower, and thermal debinding is acutely carried out, and product occurs out
Split phenomenon.In order to improve product strength, and thermal debinding is asymptotic persistently carries out, and base substrate is not in cracking phenomena, needs to introduce many
Component binding agent.
Polymethyl methacrylate and ethylene-vinyl acetate copolymer can strengthen the intensity of base substrate, simultaneously because they
Fusing point and paraffin there is very big difference so that thermal debinding asymptotic persistently can be carried out, and can be reduced to product internal stress
Minimum, is not in cracking phenomena.
Stearic acid is used as surfactant, because powder is polarity, binding agent is nonpolar, and the two is difficult absorption, for a long time
Produce precipitation during heating, therefore plus surfactant be used as powder and binding agent contact medium；Surfactant is by hydrophilic
The non-polar group composition of polar group and oleophylic, the carboxyl of activating agent is polarity, can be combined with powder, and alkyl is nonpolar
, can mix with binding agent, powder and binding agent can be attached together by such surfactant indirectly, it is ensured that mixed
That what is expected is uniform, and can play a part of lubrication between powder particle, between powder particle and die wall, so as to reach banburying
With the effect of injection.
The powder includes Zinc Oxide and additive, and the powder includes the Zinc Oxide that percentage by weight is 85%-95%
With the additive that percentage by weight is 5%-15%.The additive include following percentage by weight each component (each component
Percentage by weight sum is for 100%)：The manganese carbonate of 5%-8%, the bismuth oxide of 35%-50%, the tin ash of 2%-4%,
The cobalt sesquioxide of 15%-25%, the titanium dioxide of 5%-10%, the brium carbonate of 1%-3%, the strontium carbonate of 0.1%-1%,
The boric acid of 5%-20%, the nickel sesquioxide of 2%-10%, the aluminum nitrate of 0.1%-1%.Powder will be constituted by agitating ball mill
The each component of material uniformly mixes, and is then calcined at a temperature of 500 DEG C -700 DEG C, after having calcined, carries out ball with ball mill
The powder of 0.5 μm -2.0 μm of granularity is milled to, drying can be used.Because under this granularity, powder active is good, effectively can be burnt
Knot, crystal structure are fine and close, and crystal grain is tiny homogeneous.
The banburying of powder and binding agent is a very crucial step.In this case, the optimum of powder and binding agent is matched somebody with somebody
It is exactly crucial to put.In the present invention, the percentage by weight of binding agent is 5-30%, and the percentage by weight of powder is 70-95%.Very little
Binding agent can cause the generation in too high viscosity and space so that molding is highly difficult.Excessive binding agent is also can not
Take, because in molding, excessive binding agent can be separated with powder, so as to there are overlap, or base substrate uneven components.More
Importantly, when the binding agent of excess can cause defat composition a large amount of losses, after binding agent is removed, granule can not be maintained at
Original position, after sintering, there are the bad phenomenon such as deformation, cracking in product.
Banburying is first to dry powder, takes out cooling, then it and binding agent are added to banburying in banbury according to proportioning,
Design temperature is 120 DEG C -200 DEG C, and the frequency for arranging agitator is 25Hz-65Hz, and banburying 60min-120min, i.e. banburying are outstanding
The bright and clean cake mass in pool.
After the crushing of cake mass refers to pug cooling, carried out being crushed to the grain that mean diameter is 3mm-8mm with pulverizer
Material, pellet are easily accessible injecting machine material tube injection moulding.
With reference to embodiments the present invention is further described, the paraffin in following examples adopts full refining stone
Wax.
Embodiment 1
A kind of pellet of injection moulding varistor is present embodiments provided, by the component group of following percentage by weight
Into：
Powder 70%
Binding agent 30%；
Powder is made up of the component of following percentage by weight：
Zinc Oxide 95%
Additive 5%；
Additive is made up of the component of following percentage by weight：
Binding agent is made up of the component of following percentage by weight：
The present embodiment additionally provides the preparation method of above-mentioned pellet, and its step includes：
1) prepare binding agent
First by heating paraffin to 120 DEG C, after paraffin all melts, polymethyl methacrylate, ethyl vinyl acetate second are added
Alkene copolymer, and be stirred continuously with stirring rod, after all dissolving, stearic acid is added, binding agent is obtained, wherein adding each material
Amount according to above percentage by weight meter.
2) prepare powder
Zinc Oxide and additive according to above percentage by weight is made into its uniform mixing by agitating ball mill, it is described to stir
The rotating speed for mixing ball mill is 40r/min, and Ball-milling Time is 40h, then carries out calcining 2h at a temperature of 500 DEG C, then uses ball milling
Machine is milled to the powder that granularity is 1.0 μm.
3) banburying of powder and binding agent
First powder is dried with baking oven, 120 DEG C of drying temperature, drying time is 2h, take out after drying and be cooled to room
Temperature, then by itself and step 1) binding agent that obtains mixes according to above percentage by weight and is put into banburying in banbury, design temperature
180 DEG C, the frequency for arranging agitator is 25Hz, banburying 120min, obtains cake mass.
4) cake mass is broken
By step 3) the cake mass pulverizer that obtains is crushed to the pellet that mean diameter is 3mm, that is, obtain this enforcement
The pellet of example injection moulding varistor.
Detection：
The pellet produced using the present embodiment is put into injecting machine material tube injection moulding, wherein injection pressure 120bar, is molded
Speed 50g/s, makes varistor, assesses injection moulding production efficiency, carries out mechanics to the product for being produced with pull and push dynamometer
Performance test, while density measurement is carried out to varistor, and is compared with the product of traditional dry-pressing formed production, detection knot
Fruit is shown in Table 1.
Embodiment 2
A kind of pellet of injection moulding varistor is present embodiments provided, by the component group of following percentage by weight
Into：
Powder 75%
Binding agent 25%；
Powder is made up of the component of following percentage by weight：
Zinc Oxide 88%
Additive 12%；
Additive is made up of the component of following percentage by weight：
Binding agent is made up of the component of following percentage by weight：
The present embodiment additionally provides the preparation method of above-mentioned pellet, and its step includes：
1) prepare binding agent
First by heating paraffin to 160 DEG C, after paraffin all melts, polymethyl methacrylate, ethyl vinyl acetate second are added
Alkene copolymer, and be stirred continuously with stirring rod, after all dissolving, stearic acid is added, binding agent is obtained, wherein adding each material
Amount according to above percentage by weight meter.
2) prepare powder
The Zinc Oxide and additive of above percentage by weight are made into its uniform mixing, the stirring ball by agitating ball mill
The rotating speed of grinding machine is 50r/min, and Ball-milling Time is 30h, then in 550 DEG C of temperature lower calcination 2h, after having calcined, uses ball mill
It is milled to the powder that granularity is 1.8 μm.
3) banburying of powder and binding agent
First powder is dried with baking oven, 110 DEG C of drying temperature, drying time is 1.5h, taking-up is cooled to room temperature, then
By itself and step 1) binding agent that obtains mixes according to above percentage by weight and is put into banburying in banbury, 185 DEG C of design temperature,
The frequency for arranging agitator is 45Hz, banburying 120min, obtains cake mass.
4) cake mass is broken
By step 3) the cake mass pulverizer that obtains is crushed to the pellet that mean diameter is 5mm, that is, obtain this enforcement
The pellet of example injection moulding varistor.
Detection：
Detection method is same as Example 1, and testing result is shown in Table 1.
Embodiment 3
A kind of pellet of injection moulding varistor is present embodiments provided, by the component group of following percentage by weight
Into：
Powder 80%
Binding agent 20%；
The powder is made up of the component of following percentage by weight：
Zinc Oxide 90%
Additive 10%；
Additive is made up of the component of following percentage by weight：
Binding agent is made up of the component of following percentage by weight：
The present embodiment additionally provides the preparation method of above-mentioned pellet, and its step includes：
1) prepare binding agent
First by heating paraffin to 180 DEG C, after paraffin all melts, polymethyl methacrylate, ethyl vinyl acetate second are added
Alkene copolymer, and be stirred continuously with stirring rod, after all dissolving, stearic acid is added, binding agent is obtained, wherein adding each material
Amount according to above percentage by weight meter.
2) prepare powder
Zinc Oxide and additive according to above-mentioned percentage by weight is made into its uniform mixing by agitating ball mill, it is described to stir
The rotating speed for mixing ball mill is 30r/min, and Ball-milling Time is 50h, then in 600 DEG C of temperature lower calcination 2h, ball is used after having calcined
Grinding machine is milled to the powder that granularity is 1.8 μm.
3) banburying of powder and binding agent
First powder is dried with baking oven, 150 DEG C of drying temperature, drying time is 1h, taking-up is cooled to room temperature, then will
Itself and step 1) binding agent that obtains mixes according to above percentage by weight and is put into banburying in banbury, 185 DEG C of design temperature, if
The frequency for putting agitator is 55Hz, banburying 120min, obtains cake mass.
4) cake mass is broken
By step 3) the cake mass pulverizer that obtains is crushed to the pellet that mean diameter is 8mm, that is, obtain this enforcement
The pellet of example injection moulding varistor.
Detection：
Detection method is same as Example 1, and testing result is shown in Table 1.
Embodiment 4
A kind of pellet of injection moulding varistor is present embodiments provided, by the component group of following percentage by weight
Into：
Powder 85%
Binding agent 15%；
Powder is made up of the component of following percentage by weight：
Zinc Oxide 89%
Additive 11%；
Additive is made up of the component of following percentage by weight：
Binding agent is made up of the component of following percentage by weight：
The present embodiment additionally provides the preparation method of above-mentioned pellet, and its step includes：
1) prepare binding agent
First by heating paraffin to 190 DEG C, after paraffin all melts, polymethyl methacrylate, ethyl vinyl acetate second are added
Alkene copolymer, and be stirred continuously with stirring rod, after all dissolving, stearic acid is added, binding agent is obtained, wherein adding each material
Amount according to above percentage by weight meter.
2) prepare powder
Zinc Oxide and additive according to above-mentioned percentage by weight is made into its uniform mixing by agitating ball mill, it is described to stir
The rotating speed for mixing ball mill is 45r/min, and Ball-milling Time is 45h, then in 650 DEG C of temperature lower calcination 2h, ball is used after having calcined
Grinding machine is milled to the powder that granularity is 2.0 μm.
3) banburying of powder and binding agent
First powder is dried with baking oven, 130 DEG C of drying temperature, drying time is 1h, taking-up is cooled to room temperature, then will
Itself and step 1) binding agent that obtains mixes according to above percentage by weight and is put into banburying in banbury, 190 DEG C of design temperature, if
The frequency for putting agitator is 55Hz, banburying 120min, obtains cake mass.
4) cake mass is broken
By step 3) the cake mass pulverizer that obtains is crushed to the pellet that mean diameter is 6mm, that is, obtain this enforcement
The pellet of example injection moulding varistor.
Detection：
Detection method is same as Example 1, and testing result is shown in Table 1.
Embodiment 5
A kind of pellet of injection moulding varistor is present embodiments provided, by the component group of following percentage by weight
Into：
Powder 95%
Binding agent 5%；
Powder is made up of the component of following percentage by weight：
Zinc Oxide 85%
Additive 15%；
Additive is made up of the component of following percentage by weight：
Binding agent is made up of the component of following percentage by weight：
The present embodiment additionally provides the preparation method of above-mentioned pellet, and its step includes：
1) prepare binding agent
First by heating paraffin to 200 DEG C, after paraffin all melts, polymethyl methacrylate, ethyl vinyl acetate second are added
Alkene copolymer, and be stirred continuously with stirring rod, after all dissolving, stearic acid is added, binding agent is obtained, wherein adding each material
Amount according to above percentage by weight meter.
2) prepare powder
Zinc Oxide and additive according to above-mentioned percentage by weight is made into its uniform mixing by agitating ball mill, it is described to stir
The rotating speed for mixing ball mill is 55r/min, and Ball-milling Time is 35h, then in 700 DEG C of temperature lower calcination 2h, ball is used after having calcined
Grinding machine is milled to the powder that granularity is 1.5 μm.
3) banburying of powder and binding agent
Banburying is that first powder is dried with baking oven, 100 DEG C of drying temperature, and drying time is 2h, and taking-up is cooled to room
Temperature, then by itself and step 1) binding agent that obtains mixes according to above percentage by weight and is put into banburying in banbury, design temperature
180 DEG C, the frequency for arranging agitator is 65Hz, banburying 120min, obtains cake mass.
4) cake mass is broken
By step 3) the cake mass pulverizer that obtains is crushed to the pellet that mean diameter is 8mm, that is, obtain this enforcement
The pellet of example injection moulding varistor.
Detection：
Detection method is same as Example 1, and testing result is shown in Table 1.
1. varistor of table detects table
From embodiment 1-5 testing result, the product produced with the pellet of injection moulding varistor of the present invention
Mechanical property is better than the product that traditional dry-pressing formed method is produced, and its product density is also greater than traditional dry-pressing formed
The product density that method is produced, and production efficiency is greatly improved.
Above content is with reference to specific preferred implementation further description made for the present invention, it is impossible to assert
The present invention be embodied as be confined to these explanations.For those skilled in the art, do not taking off
On the premise of present inventive concept, some equivalent substitutes or obvious modification can also be made, and performance or purposes are identical, all answer
When being considered as belonging to protection scope of the present invention.
Claims (10)
1. a kind of pellet of injection moulding varistor, it is characterised in that including each component of following percentage by weight：
Powder 70%-95%
Binding agent 5%-30%；
The powder includes each component of following percentage by weight：
Zinc Oxide 85%-95%
Additive 5%-15%；
The additive includes each component of following percentage by weight：
The binding agent includes each component of following percentage by weight：
The polymethyl methacrylate and ethylene-vinyl acetate copolymer can strengthen the intensity of base substrate, can cause thermal debinding
Asymptotic persistently can carry out.
2. the pellet of injection moulding varistor as claimed in claim 1, it is characterised in that the weight percent of the powder
It is 20% than the percentage by weight for 80%, the binding agent.
3. the pellet of injection moulding varistor as claimed in claim 1 or 2, it is characterised in that the powder includes
Percentage by weight is 90% Zinc Oxide, and percentage by weight is 10% additive.
4. the pellet of injection moulding varistor as claimed in claim 1 or 2, it is characterised in that the additive includes
The each component of following percentage by weight：
5. the pellet of injection moulding varistor as claimed in claim 1 or 2, it is characterised in that the binding agent includes
The each component of following percentage by weight：
6. the pellet of injection moulding varistor as claimed in claim 1 or 2, it is characterised in that the paraffin is full essence
Refining paraffin.
7. the preparation method of the pellet of the injection moulding varistor described in a kind of any one of claim 1-6, its feature exist
In comprising the steps：
1) prepare binding agent：By heating paraffin to 120 DEG C -200 DEG C after paraffin all melts, polymethyl methacrylate is added
And ethylene-vinyl acetate copolymer, and stir to after all dissolving, stearic acid is added, binding agent is obtained；
2) prepare powder：Zinc Oxide and additive are uniformly mixed by agitating ball mill, then calcined, after having calcined
The powder of certain particle size is milled to ball mill；
3) banburying of powder and binding agent：Powder drying is subsequently cooled to into room temperature first, then by itself and the step 1)
To binding agent banburying in banbury, obtain cake mass；
4) crushing of cake mass：The cake mass is crushed to into the pellet of appropriate particle diameter.
8. preparation method as claimed in claim 7, it is characterised in that the step 2) in：The rotating speed of the agitating ball mill
For 30r/min-60r/min, Ball-milling Time is 30h-50h；The temperature of the calcining is 500 DEG C -700 DEG C, and calcination time is 1h-
3h；The certain particle size refers to 0.5 μm -2.0 μm.
9. preparation method as claimed in claim 7, it is characterised in that the step 3) in：The temperature of the drying be 80 DEG C-
150 DEG C, drying time is 1h-2h；The room temperature refers to 20 DEG C -30 DEG C；It is described in banbury during banburying, mixing temperature is
120 DEG C -200 DEG C, the frequency of the agitator of banbury is 25Hz-65Hz, and mixing time is 60min-120min.
10. preparation method as claimed in claim 7, it is characterised in that the step 4) it is specially：With pulverizer by described piece
Shape pug is crushed to the pellet that mean diameter is 3mm～8mm.
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| TWI236683B (en) * | 2002-07-25 | 2005-07-21 | Murata Manufacturing Co | Varistor and manufacturing method thereof |
| CN102674822B (en) * | 2012-04-20 | 2013-08-21 | 深圳顺络电子股份有限公司 | Injection molding granules for ferrite cores and production method thereof |
| CN103030390B (en) * | 2012-12-28 | 2014-04-16 | 深圳顺络电子股份有限公司 | Zinc oxide piezoresistor material and preparation method |
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