CN100567576C - Produce the method for cathode of oxygen making machine with dry pressing - Google Patents
Produce the method for cathode of oxygen making machine with dry pressing Download PDFInfo
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- CN100567576C CN100567576C CNB200610022277XA CN200610022277A CN100567576C CN 100567576 C CN100567576 C CN 100567576C CN B200610022277X A CNB200610022277X A CN B200610022277XA CN 200610022277 A CN200610022277 A CN 200610022277A CN 100567576 C CN100567576 C CN 100567576C
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Abstract
A kind of method of producing cathode of oxygen making machine with dry pressing that the present invention proposes, belong to the technology that electro-chemistry oxygen-producing unit cathodes and water intermediate ion film are got oxygen, it is with the tetrafluoroethylene powder, carbon black is a base-material, allocate auxiliary materials such as scale graphite and whipping agent into, press batching, stir mixing, go into the step system oxygen unit cathodes of producing of mould dry-pressing and roasting typing, advantage with splendid air permeable waterproof performance and good low resistance performance, it is compared with " wet method is rolling " method, the dry pressing technology that the present invention proposes, obviously improved the technological operation of setting-in copper net electrode lead-in wire in the negative electrode, it is simple and direct that it has technology, easy to operate, the operating efficiency height, the characteristics that production cost is low, the negative electrode of producing with dry pressing is fitted to oxygenerator, can obviously improve oxygen-producing amount and working stability performance, the quality product that improves and improve oxygenerator is had good result, the fabulous prospect of promoting the use of is arranged.
Description
Technical field:
The present invention relates to make the production technology of Oxygen Electrode Material, belong to the technical field that electrochemical ion film system oxygen unit cathodes material and water intermediate ion film are got oxygen, specifically a kind of method of producing cathode of oxygen making machine with dry pressing.
Background technology:
We know that existing family medical oxygen generator generally is divided into physics system oxygen and two kinds of methods of chemical oxygen generation.Physics system oxygen is to carry out the separation of nitrogen oxygen with polymer sieve transformation absorption isolation technique from air dielectric to produce oxygen for smoking, though physical oxygen-making device has the oxygen of getting aboundresources, produces the oxygen abundant amount and cures by oxygen therapy advantages such as stable, but owing to shortcomings such as there are complex structure in physical oxygen-making device, the compressor operating noise is big and production cost is high, cost an arm and a leg, general family is difficult to accept.And chemical oxygen generation particularly adopts electrochemical ion film system oxygen unit cathodes to get family's medical oxygen generator of oxygen technology from water intermediate ion film, because it is little, in light weight, cheap that it has a volume, produce oxygen rapidly, oxygen therapy efficient height, advantage such as easy for operation, be subjected to users' favor deeply.Undoubtedly: electrochemical ion film system oxygen unit cathodes is the key core technology of chemical oxygen generator, and the quality of ionic membrane system oxygen unit cathodes material will directly influence the serviceability of oxygenerator.Generally speaking: require system oxygen unit cathodes material to have low resistance performance and splendid waterproof and breathable performance, and require negative electrode to have physical strength and physical dimension stability preferably, has technological operation preferably in process of production, can be convenient to equipped contact conductor and the firm reliability of guaranteeing contact conductor, in use have the performance of long-term stable operation.Existing method of producing cathode of oxygen making machine is that raw material is made the mud shape through fully stirring, and repeat-rolling on double-roll rolling mill forms through the roasting typing more then.The negative electrode product that adopts the method for this " wet method rolling-roasting typing " to produce exists following defective: the technological operation poor-performing of the copper net electrode of equipped negative electrode finished product lead-in wire on double-roll rolling mill, production operation efficiency is lower, especially in the roasting type-approval process, mud shape material has a large amount of liquid medium evaporations, not only influence the stability of negative electrode finished product physical dimension, also can be in the negative electrode finished product buried steam bubble down even mass defect such as recessive crack occurs, influence negative electrode finished product physical strength and waterproof and breathable performance, the firm reliability that shows as contact conductor in actual use is poor, it is permeable to occur layering easily, cause cathodic conductivity to reduce, certainly will influence the task performance of oxygenerator.This is the mortality technological deficiency that adopts the negative electrode product of wet method rolling method production to be difficult to overcome at present.This problem also to be solved by this invention just.
Summary of the invention:
Purpose of the present invention is intended to the technological deficiency at the rolling negative electrode product existence of wet method, proposes a kind of method of producing cathode of oxygen making machine with dry pressing, and it is to the further improvement of existing system oxygen unit cathodes material and production method thereof and perfect.
The method of producing cathode of oxygen making machine with dry pressing that the present invention proposes, it is to be base-material with tetrafluoroethylene powder and carbon black, it is characterized in that: it carries out successively according to the following steps:
(1) batching: be on the waiting list base-material by following weight proportion metering
1 part of tetrafluoroethylene powder
0.35～0.45 part of carbon black
The control base-material: the particle diameter of tetrafluoroethylene powder≤1000 micron,
The particle diameter of carbon black≤1000 micron,
Allocate graphite into by 2.5～5.0% of base-material gross weight, granularity≤200 orders of control graphite,
Allocate whipping agent into by 3.5～5.0% of base-material gross weight,
Above-described graphite is to select the scale graphite product with low resistance high conduction performance for use,
Scale graphite: granularity≤200 orders, carbon content 〉=99%, volatile content≤0.25% selects for use the scale graphite material can have positive effect to reduction cathode resistor, raising cathodic conductivity,
Above-mentioned said whipping agent is that to select the commercially available trade mark of being produced by Ningxia Ri Sheng Industrial Co., Ltd. for use be ADC type whipping agent.
(2) stir mixing: the material that will take by weighing in step (1) batching is put into mixer and is carried out stirring and evenly mixing, makes compound,
Described stirring and evenly mixing is meant: the mixing speed of mixer is 1000～1500 rev/mins, and the continuously stirring time is: 5～10 minutes, when the material that is stirred presents the cotton fiber shape, promptly make qualified compound, and it is easy to into the mould dry pressing.
(3) go into the mould dry-pressing: carry out dry pressing in the compound adding pressing mold that will make in step (2) stir mixing, make the shaping negative electrode, control pressure is: 20～30MPa.
Described pressing mold is made by designed negative electrode finished product physical dimension processing requirement, when going into the mould dry-pressing, with specification is 60～100 purpose sieve compounds, the compound that sieves is put in the pressing mold, put into the inventory of compound by design requirements control, and be equipped with the copper net electrode lead-in wire of negative electrode finished product, pressurization then in the centre, can disposable dry-pressing make the shaping negative electrode, the method that adopts dry pressing to the firm reliability of guaranteeing contact conductor, prevent that the negative electrode layering is permeable and have a positive effect.
(4) roasting typing: will go into the shaping negative electrode that makes in the mould dry-pressing in step (3) and carry out roasting, the control maturing temperature is: 200～380 ℃, roasting time is: 6～8 hours, promptly make the negative electrode product of having finalized the design qualified.
Described roasting is meant the shaping negative electrode sent into carries out roasting typing in the baking oven, the control maturing temperature is: in 1～1.5 hour, slowly be warming up to 200 ℃ by room temperature; In 2～4 hours, slowly be warming up to 350 ℃ by 200 ℃ and carry out roasting, can make the whipping agent slowly volatilization from the shaping negative electrode gradually in the compound, form the ventilative micropore of even compact, waterproof, the waterproof and breathable performance that improves negative electrode is had positive effect; Be incubated 2～4 hours and carry out the roasting typing under 370 ℃～380 ℃ temperature, with size and the raising physical strength of stablizing the negative electrode finished product, naturally cooling promptly makes qualified negative electrode product then.
The present invention also has following technical characterictic:
In the batching step, among the tetrafluoroethylene powder of described particle diameter≤1000 micron, the polytetrafluoroethylsuspending suspending fine powder of particle diameter≤200 micron accounts for 60～80% by weight.
Among the tetrafluoroethylene material of particle diameter≤1000 micron: particle diameter≤200 micron be the polytetrafluoroethylsuspending suspending fine powder, all the other then are that tetrafluoroethylene disperses fine powder.The present invention proposes disperses fine powder to constitute the negative electrode compound by the polytetrafluoroethylsuspending suspending fine powder of the control different-grain diameter of certain weight ratio collocation and tetrafluoroethylene to have the unique technique effect, can obviously improve the tightness of cathode material, improve the serviceability of negative electrode effectively.
Advantage of the present invention shows as:
(1) method with dry pressing production cathode of oxygen making machine of the present invention's proposition, technical process is simple and direct, convenient operation and management, the production operation efficiency height, can reduce production costs greatly, particularly adopt the dry pressing technology of original creation, can obviously improve and improve the technological operation of setting-in copper net electrode lead-in wire in the negative electrode, improve the solid and reliable performance of contact conductor, to preventing that the electrode layering is permeable, improve the negative electrode serviceability, improving the oxygenerator quality product and have outstanding substantive distinguishing features and marked improvement;
(2) the cathode of oxygen making machine finished product of producing with dry pressing has splendid air permeable waterproof performance and good low resistance performance, negative electrode stable working state;
(3) the cathode of oxygen making machine product design dimensional stabilizing of producing with dry pressing has physical strength preferably, is convenient to assembling flow path processing operation, in actual production, only need to change pressing mold, the electrode finished product that just can make all size shape is to satisfy the needs of different oxygenerators, and adaptability is strong;
(4) negative electrode of producing with dry pressing is fitted to oxygenerator, can obviously improve oxygen-producing amount, has the long-term working stability energy, and the serviceability that improves and improve oxygenerator is had positively effect.
Embodiment:
Embodiment one:
With the method that dry pressing is produced cathode of oxygen making machine, it carries out successively according to the following steps:
(1) batching: be on the waiting list base-material by following weight proportion metering
Tetrafluoroethylene powder particle diameter≤1000 microns 8kg
Black grain diameter≤1000 micron 3.2kg
Scale graphite granularity≤200 order 0.32kg
ADC type whipping agent 0.46kg
ADC type whipping agent is to select the commercially available whipping agent finished product by the production of Ningxia Ri Sheng Industrial Co., Ltd. for use.
(2) stir mixing: the material that metering takes by weighing is put into mixer, start mixer,, make the material that is stirred present the cotton fiber shape, promptly make qualified compound by 1000 rev/mins rotating speed high-speed stirring 6 minutes;
(3) go into the mould dry-pressing: will be installed in the dry press by the pressing mold that designed negative electrode finished product physical dimension (for example: long 160mm, wide 140mm, thick 3mm) processing requirement is made, to send into specification be that 80 purpose sieves sieve to the compound that stir mixing is made again, the compound that sieves is put into pressing mold, accurately put into the inventory of compound by design requirements, and the copper net electrode that is equipped with the negative electrode finished product in the centre goes between, apply the pressure of 26MPa then, can disposable dry-pressing make the shaping negative electrode;
(4) roasting typing: will go into shaping negative electrode that the mould dry-pressing makes and send into and carry out the roasting typing in the electric oven, accurately control the intensification maturing temperature in the electric oven: in 1.5 hours, slowly be warming up to 200 ℃, in 3 hours, continue slowly to be warming up to 350 ℃ again and carry out roasting, continue to be warming up to 380 ℃ of roastings 3 hours again, naturally cooling promptly makes the negative electrode product that adheres to specification then.
Embodiment two
With the method that dry pressing is produced cathode of oxygen making machine, it carries out successively according to the following steps:
(1) batching: be on the waiting list base-material by following weight proportion metering
Polytetrafluoroethylsuspending suspending fines particle diameter≤200 microns 5.8kg
Tetrafluoroethylene disperses 200 microns＜particle diameter of fines≤1000 microns 2.2kg
Black grain diameter≤1000 micron 2.8kg
Scale graphite granularity≤200 order 0.29kg
ADC type whipping agent 0.52kg
ADC type whipping agent is commercially available, by the whipping agent finished product of Ningxia Ri Sheng Industrial Co., Ltd. production;
(2) stir mixing: the material that metering takes by weighing is put into mixer, start mixer,, make the material that is stirred present the cotton fiber shape, promptly make qualified compound by 1200 rev/mins rotating speed high-speed stirring 5 minutes;
(3) go into the mould dry-pressing: will be installed in the dry press by the pressing mold that designed negative electrode finished product physical dimension processing requirement is made, to send into specification be that 80 purpose sieves sieve to the compound that stir mixing is made again, the compound that sieves is put into pressing mold, accurately put into the inventory of compound by design requirements, and the copper net electrode that is equipped with the negative electrode finished product in the centre goes between, apply the pressure of 28MPa then, can disposable dry-pressing make the shaping negative electrode; ,
(4) roasting typing: will go into shaping negative electrode that the mould dry-pressing makes and send into and carry out the roasting typing in the electric oven, accurately control the intensification maturing temperature in the electric oven: in 1 hour, slowly be warming up to 200 ℃, in 3 hours, continue again slowly to be warming up to 350 ℃ carry out roasting after, continue to be warming up to 370 ℃ of roastings 4 hours again, naturally cooling promptly makes the negative electrode product then.
Claims (2)
1. method of producing cathode of oxygen making machine with dry pressing, it is to be base-material with tetrafluoroethylene powder and carbon black, it is characterized in that: it carries out successively according to the following steps:
(1) batching: be on the waiting list base-material by following weight proportion metering
1 part of tetrafluoroethylene powder
0.35～0.45 part of carbon black
The control base-material: the particle diameter of tetrafluoroethylene powder≤1000 micron,
The particle diameter of carbon black≤1000 micron,
Allocate graphite into by 2.5～5.0% of base-material gross weight, granularity≤200 orders of control graphite,
Allocate whipping agent into by 3.5～5.0% of base-material gross weight,
(2) stir mixing: the material that will take by weighing in step (1) batching is put into mixer and is carried out stirring and evenly mixing, makes compound,
(3) go into the mould dry-pressing: carry out dry pressing in the compound adding pressing mold that will make in step (2) stir mixing, make the shaping negative electrode, control pressure is: 20～30MPa,
(4) roasting typing: will go into the shaping negative electrode that makes in the mould dry-pressing in step (3) and carry out roasting, the control maturing temperature is: 200～380 ℃, roasting time is 6～8 hours, promptly makes the negative electrode product of having finalized the design qualified.
2. method of producing cathode of oxygen making machine with dry pressing according to claim 1, it is characterized in that: in the batching step, among the tetrafluoroethylene powder of described particle diameter≤1000 micron, the polytetrafluoroethylsuspending suspending fine powder of particle diameter≤200 micron accounts for 60～80% by weight.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610022277XA CN100567576C (en) | 2006-11-17 | 2006-11-17 | Produce the method for cathode of oxygen making machine with dry pressing |
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| CNB200610022277XA CN100567576C (en) | 2006-11-17 | 2006-11-17 | Produce the method for cathode of oxygen making machine with dry pressing |
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| CN1974857A CN1974857A (en) | 2007-06-06 |
| CN100567576C true CN100567576C (en) | 2009-12-09 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4278525A (en) * | 1978-04-24 | 1981-07-14 | Diamond Shamrock Corporation | Oxygen cathode for alkali-halide electrolysis cell |
| US4456521A (en) * | 1980-10-31 | 1984-06-26 | Diamond Shamrock Corporation | Three layer laminate |
| US4500647A (en) * | 1980-10-31 | 1985-02-19 | Diamond Shamrock Chemicals Company | Three layer laminated matrix electrode |
-
2006
- 2006-11-17 CN CNB200610022277XA patent/CN100567576C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4278525A (en) * | 1978-04-24 | 1981-07-14 | Diamond Shamrock Corporation | Oxygen cathode for alkali-halide electrolysis cell |
| US4456521A (en) * | 1980-10-31 | 1984-06-26 | Diamond Shamrock Corporation | Three layer laminate |
| US4500647A (en) * | 1980-10-31 | 1985-02-19 | Diamond Shamrock Chemicals Company | Three layer laminated matrix electrode |
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| CN1974857A (en) | 2007-06-06 |
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Owner name: JIAHUA SPECIAL CEMENT CO., LTD. Free format text: FORMER NAME: SICHUAN JIAHUA ENTERPRISE (GROUP) CORP., LTD. |
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Address after: 614003 Ma'anshan City, Sichuan Province, No. nine Feng Road, No. 2, Patentee after: Jia Hua special cement incorporated company Address before: 614003 Ma'anshan City, Sichuan Province, No. nine Feng Road, No. 2, Patentee before: Sichuan Jiahua Enterprise (Group) Co., Ltd. |