CN102311626A - Polycarbonate/glass fiber alloy, preparation method and application thereof - Google Patents
Polycarbonate/glass fiber alloy, preparation method and application thereof Download PDFInfo
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Abstract
The present invention discloses a polycarbonate/glass fiber alloy, a preparation method and an application thereof. The raw material formula of the polycarbonate/glass fiber alloy comprises the following components, by weight, 30-50 parts of PC, 30-50 parts of a PC recycled material, 0.3-0.5 parts of a FR2025 fireproofing agent, 0.5-2 parts of titanium dioxide, 9.5-11.5 parts of glass fiber, 2-5 parts of EMA, 0.1-0.5 parts of an antioxidant 1010, 0.1-0.5 parts of an antioxidant 168, 0.3-0.5 parts of an anti-ultraviolet agent UV-531, 0.03-0.08 parts of dispersion powder EBS, 0.04-0.08 parts of ultramarine blue powder, 0.02-0.04 parts of red iron oxide powder and 0.005-0.01 parts of high temperature resistant fluorescent yellow powder. The alloy provided by the present invention has characteristics of high performance, high fire retardation, high shock resistance, high stability, antistatic property and the like, and can be applicable for preparing intelligent electricity meter housing or terminal block.
Description
Technical field
The present invention relates to polymeric material field, relate in particular to polycarbonate/spun glass alloy field, be specifically related to a kind of polycarbonate/spun glass Alloy And Preparation Method and application that utilizes the polycarbonate regenerated material preparation.
Background technology
Polycarbonate (PC) is a kind of common general-purpose plastics; Contain carbonate group; Structure according to ester group can be divided into broad varietys such as aliphatics, aromatic series, is a kind of water white indefiniteness thermoplastic material; Its chemical property is weak acid resistant, anti-weak base, anti-neutral oil, not ultraviolet resistance and not anti-highly basic, and its physical properties is linear expansivity: 38 * 10cm/cm
2, 135 ℃ of thermal change type temperature, have poor stability, exist stress be easy to split, low to the breach anti-impact force, wear no resistance, shortcomings such as, viscosity low to the metalwork bounding force is big, mobile difference and influence processing injection moulding.
Spun glass (GF) joins in the polycarbonate, but the physical mechanical rigidity of strongthener.
Because polycarbonate is a material relatively commonly used, so can produce a large amount of defective materials or substandard products, recovery article, the processing for defective material, substandard products or recovery article at present mainly contains following several method:
(1) burning or land-fill method; Because remittance produces obnoxious flavoures such as sulfurous gas in burning process, very easily causes environmental pollution, and takes land-fill method; The refractory organics of polycarbonate also can cause very big harm to environment, and present this mode progressively is eliminated;
(2) defective material, substandard products or recovery article are simply reclaimed take out grain and do not carry out any modification, be downgraded to common plastics to use,, fail to make full use of the economic worth of these defective materials though solved problem of environmental pollution.
Therefore, how to reclaim and fully use these defective materials, substandard products or recovery article, it is a problem of benefiting the nation and the people that the back that makes it to regenerate produces new economic benefit.
Summary of the invention
The objective of the invention is to the deficiency to prior art, providing a kind of is staple with polycarbonate raw material combination polycarbonate regenerated material, has the polycarbonate/spun glass alloy of high-performance, high flame retardant, high-impact, high stability and antistatic characteristics.
Another object of the present invention is to provide the preparation method of above-mentioned polycarbonate/spun glass alloy.
Another object of the present invention is to provide the application of above-mentioned polycarbonate/spun glass alloy.
Above-mentioned purpose of the present invention is achieved through following scheme:
A kind of polycarbonate/spun glass alloy, its composition of raw materials is made up of each component of following parts by weight:
30～50 parts of polycarbonate;
30～50 parts of polycarbonate regenerated materials;
0.3～0.5 part of FR2025 fireproofing agent;
0.5～2 part of titanium oxide;
9.5～11.5 parts in spun glass;
2～5 parts of EMA;
0.1～0.5 part of antioxidant 1010;
168 0.1～0.5 part in oxidation inhibitor;
0.3～0.5 part of anti UV agent UV-531;
0.03～0.08 part of spread powder EBS;
0.04～0.08 part of ultramarine blue toner;
0.02～0.04 part of red iron oxide toner;
0.005～0.01 part of high temperature resistant fluorescent yellow toner.
Above-mentioned polycarbonate adopts commercially available any polycarbonate raw material all can realize the present invention.
Above-mentioned polycarbonate regenerated material adopt any polycarbonate regenerated material all can, like polycarbonate defective material, substandard products or recovery article or the like; Polycarbonate of the present invention/spun glass alloy can prepare intelligent electric meter housing or terminal row; Because it has certain color requirement the intelligent electric meter housing; So polycarbonate of the present invention/spun glass alloy is when being used to prepare the intelligent electric meter housing; Polycarbonate regenerated material does not preferably adopt dark colour polycarbonate regenerated material such as have black, dark blue or bright red; Because the reworked material color shoaled needs cost, and when polycarbonate of the present invention/spun glass alloy when being used to prepare terminal row, then the color of polycarbonate regenerated material is not carried out requirement.
Above-mentioned FR2025 fireproofing agent is the commercially available prod, and the FR2025 fireproofing agent is an environmental protection fire retarding agent, plays the effect of fire retardant in the present invention.
Above-mentioned titanium oxide (TiO
2) in the present invention, can play the effect variegated, that brighten that disappears to the color of polycarbonate regenerated material among the present invention, make that the color and luster of product of the present invention is more suitable.
Above-mentioned spun glass (GF) is the commercially available prod, plays in the present invention to make that alloy insulativity of the present invention improves, weathering resistance is strengthened, erosion resistance is good, physical strength is high, augmented is stable and the effect of impact-resistance.
Above-mentioned EMA is the english abbreviation of ethylene-acrylate copolymer, is the commercially available prod, and effect in the present invention is that the spun glass in the alloy of the present invention is played toughening effect, overcomes the fragility of spun glass.
Above-mentioned antioxidant 1010 and oxidation inhibitor 168 are the commercially available prod, play the effect of heat resistanceheat resistant, resist oxygen aging in the present invention.
Above-mentioned anti UV agent UV-531 is the commercially available prod, plays in the present invention to overcome polycarbonate variable color under uviolizing, modification and easy aged effect.
Above-mentioned spread powder EBS is the commercially available prod, plays effect lubricated, diffusion in the present invention.
The effect of above-mentioned ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner is arrange in pairs or groups 1U, the 4U of the color The profile that modulates together; Ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner adopt the commercially available prod to get final product.
The preparation method of above-mentioned polycarbonate/spun glass alloy is according to the above-mentioned raw materials prescription; Send in the twin screw extruder after polycarbonate, polycarbonate regenerated material, FR2025 fireproofing agent, titanium oxide, spun glass, EMA, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner mixed; Melting mixing under 240～290 ℃ temperature; After the gained melt is extruded by twin screw extruder; Through the tank cooling, introduce dicing machine and carry out the pelletizing operation, collect pellet and be polycarbonate of the present invention/spun glass alloy.
Among the above-mentioned preparation method; Polycarbonate, polycarbonate regenerated material, FR2025 fireproofing agent, titanium oxide, spun glass, EMA, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner are mixed, under 650～1300 rev/mins rotating speed, polycarbonate, polycarbonate regenerated material, FR2025 fireproofing agent, titanium oxide, spun glass, EMA, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner are mixed; Adopt 650～1300 rev/mins rotating speed to stir, if be because stir and to mix badly too slowly, stirs too soon, material is understood cracking.
Among the above-mentioned preparation method, the rotating speed of twin screw extruder is 250～400rPm.
Among the above-mentioned preparation method, it is 240～290 ℃ that melting mixing adopts temperature, is that fusion is bad because temperature is too low, and temperature is too high, and material can cracking.
Among the above-mentioned preparation method, the melt of being extruded by twin screw extruder is when tank cools off, and used tank temperature is 60～80 ℃; The inventor is through discovering, tank refrigerative temperature also can have certain influence to product here, if the tank temperature is low excessively; Then the space is excessive and frangible between pellet; If the tank temperature is too high, then pellet is prone to bonding, therefore; After the tank temperature was optimized, the tank temperature that inventor's selection is used for cold fuse-element was 60～80 ℃.
Among the above-mentioned preparation method, the rotating speed of dicing machine is 600～900rpm; The inventor is through discovering, if the dicing machine rotating speed is slow excessively, then pellet can be too loose, if the dicing machine rotating speed is too fast, then pellet can be too little, and therefore, it is suitable that the rotating speed of dicing machine need be adjusted, otherwise all can be to final pellet attractive in appearance influential; To this, the inventor optimizes and revises the rotating speed of dicing machine, and the rotating speed of finally selecting dicing machine is 600～900rpm.
Above-mentioned preparation gained polycarbonate/spun glass alloy is carried out performance test; Find that this alloy has high-performance, high flame retardant, high-impact, high stability and characteristics such as antistatic, can be used for preparing intelligent electric meter housing (like individual event ammeter housing, three ammeter housings etc.) or terminal row.
Compared with prior art, the present invention has following beneficial effect:
1. polycarbonate of the present invention/spun glass alloy; Adopted polycarbonate regenerated material to replace most polycarbonate raw material in its raw material, in order to guarantee the excellent property of the finished product, the inventor is to the characteristics of the reworked material proper auxiliary agent of having arranged in pairs or groups; And the consumption of each auxiliary agent optimized; The selection of each auxiliary agent makes polycarbonate regenerated material also can prepare the polycarbonate of excellent property/spun glass alloy, is national save energy, is again environmental friendly regenerated resource recycling; Energy-conservation, reduction of discharging, environmental friendly regenerated that whole process is accomplished is for national save energy is contributed;
2. polycarbonate of the present invention/spun glass alloy, its each item performance index all meet or exceed the standard of system of State Grid, and it is big to have solved pure raw materials viscosity; Poor adhesion to metal; Shortcomings such as mobile difference and processing difficulties have also solved the existence of polycarbonate raw material and have been easy to stress cracking, and stability is low; Relatively more responsive for breach, and the not good enough problems such as [6 ~ 8] of wear resistance;
3. prior art adopts the polycarbonate/spun glass alloy of polycarbonate feedstock production, and it is stretched and draws the about 64MPa of intensity, the about 2300Mpa of modulus in flexure, and polycarbonate of the present invention/spun glass alloy its stretch and draw intensity to reach 740kg/cm
2, bending modulus reaches 34000kg/cm
2, and product to reach the type body stable, it is the most stable material modified to be that present intelligent electric meter housing and terminal row meet most;
4. the preparation method of polycarbonate of the present invention/spun glass alloy according to the characteristics of its formula material, optimizes the rotating speed and the temperature of its raw materials mix rotating speed, twin screw extruder, thereby has guaranteed the premium properties of preparation gained alloy.
Embodiment
Below in conjunction with specific embodiment the present invention is done description further, but specific embodiment is not done any qualification to the present invention.
Embodiment 1
A kind of polycarbonate/spun glass the alloy of present embodiment, its composition of raw materials is made up of each component of following parts by weight:
32 parts of polycarbonate;
50 parts of polycarbonate regenerated materials;
0.5 part of FR2025 fireproofing agent;
2 parts of titanium oxide;
10 parts in spun glass;
4 parts of EMA;
0.5 part of antioxidant 1010;
168 0.3 parts in oxidation inhibitor;
0.5 part of anti UV agent UV-531;
0.08 part of spread powder EBS;
0.08 part of ultramarine blue toner;
0.04 part of red iron oxide toner;
0.01 part of high temperature resistant fluorescent yellow toner.
The preparation method of the polycarbonate of present embodiment/spun glass alloy is according to the above-mentioned raw materials prescription; Send in the twin screw extruder after polycarbonate, polycarbonate regenerated material, spun glass, EMA, FR2025 fireproofing agent, titanium oxide, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner mixed; Melting mixing under 250 ℃ temperature; After the gained melt is extruded by twin screw extruder; Through the tank cooling, introduce dicing machine and carry out the pelletizing operation, collect polycarbonate/spun glass alloy that pellet is present embodiment.
Among the above-mentioned preparation method; Polycarbonate, polycarbonate regenerated material, spun glass, EMA, FR2025 fireproofing agent, titanium oxide, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner are mixed, under 1300 rev/mins rotating speed, polycarbonate, polycarbonate regenerated material, spun glass, EMA, FR2025 fireproofing agent, titanium oxide, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner are mixed.
Among the above-mentioned preparation method, the rotating speed of twin screw extruder is 400rPm.
Among the above-mentioned preparation method, the tank temperature that the tank cooling is adopted is 70 ℃.
Among the above-mentioned preparation method, the rotating speed of dicing machine is 600rpm.
Adopt the ASTM international standard that polycarbonate/spun glass alloy that present embodiment prepares is carried out performance test, the result is as shown in table 1.
Table 1 polycarbonate/spun glass alloy performance test result
| Character | Method | Unit | Data |
| Proportion | ASTM D792 | — | 1.25 |
| Mould shrinks | ASTM D955 | % | 0.5 |
| Tensile strength | ASTM D638 | Kg/c㎡ | 740 |
| Flexural strength | ASTM D638 | Kg/c㎡ | 1200 |
| Unit elongation | ?ASTM D90 | % | 4 |
| Bending modulus | ASTM D90 | Kg/c㎡ | 34000 |
| Notched Izod impact strength (1/8 ") (23 ℃) | ASTM D256 | Kg·㎝/㎝ | 15 |
| Heat-drawn wire | ASTM D648 | ℃ | 130 |
| Flame resistivity | UL94 | (1/8") | V0 |
| Drying temperature | — | ℃ | 120 |
| Time of drying | — | HR | 4 |
| Melt temperature | — | ℃ | 240～290 |
| Suggestion mould temperature | — | ℃ | 110 |
Can find out from table 1 that the polycarbonate/spun glass alloy of present embodiment preparation has reached the standard of materials requirement of system of State Grid to intelligent electric meter housing (or terminal row) through detecting, realize the purpose of energy-saving and emission-reduction, environmental protection.
Embodiment 2
A kind of polycarbonate/spun glass the alloy of present embodiment, its composition of raw materials is made up of each component of following parts by weight:
50 parts of polycarbonate;
32 parts of polycarbonate regenerated materials;
0.3 part of FR2025 fireproofing agent;
2 parts of titanium oxide;
11 parts in spun glass;
3 parts of EMA;
0.5 part of antioxidant 1010;
168 0.5 parts in oxidation inhibitor;
0.5 part of anti UV agent UV-531;
0.08 part of spread powder EBS;
0.08 part of ultramarine blue toner;
0.03 part of red iron oxide toner;
0.01 part of high temperature resistant fluorescent yellow toner.
The preparation method of the polycarbonate of present embodiment/spun glass alloy is according to the above-mentioned raw materials prescription; Send in the twin screw extruder after polycarbonate, polycarbonate regenerated material, spun glass, EMA, FR2025 fireproofing agent, titanium oxide, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner mixed; Melting mixing under 260 ℃ temperature; After the gained melt is extruded by twin screw extruder; Through the tank cooling, introduce dicing machine and carry out the pelletizing operation, collect polycarbonate/spun glass alloy that pellet is present embodiment.
Among the above-mentioned preparation method; Polycarbonate, polycarbonate regenerated material, spun glass, EMA, FR2025 fireproofing agent, titanium oxide, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner are mixed, under 1300 rev/mins rotating speed, polycarbonate, polycarbonate regenerated material, spun glass, EMA, FR2025 fireproofing agent, titanium oxide, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner are mixed.
Among the above-mentioned preparation method, the rotating speed of twin screw extruder is 400rPm.
Among the above-mentioned preparation method, the tank temperature that the tank cooling is adopted is 80 ℃.
Among the above-mentioned preparation method, the rotating speed of dicing machine is 900rpm.
Adopt the ASTM international standard that polycarbonate/spun glass alloy that present embodiment prepares is carried out performance test, the result is as shown in table 2.
The The performance test results of table 2 polycarbonate/spun glass alloy
| Character | Method | Unit | Data |
| Proportion | ASTM D792 | — | 1.2 |
| Mould shrinks | ASTM D955 | % | 0.4 |
| Tensile strength | ASTM D638 | Kg/c㎡ | 740 |
| Flexural strength | ASTM D638 | Kg/c㎡ | 1200 |
| Unit elongation | ?ASTM D90 | % | 4.2 |
| Bending modulus | ASTM D90 | Kg/c㎡ | 34000 |
| Notched Izod impact strength (1/8 ") (23 ℃) | ASTM D256 | Kg·㎝/㎝ | 15 |
| Heat-drawn wire | ASTM D648 | ℃ | 128 |
| Flame resistivity | UL94 | (1/8") | V0 |
| Drying temperature | — | ℃ | 120 |
| Time of drying | — | HR | 4 |
| Melt temperature | — | ℃ | 240～290 |
| Suggestion mould temperature | — | ℃ | 110 |
Can find out from table 2 that the polycarbonate of present embodiment/spun glass alloy has reached the standard of materials requirement of system of State Grid to intelligent electric meter housing (or terminal row) through detecting, realize the purpose of energy-saving and emission-reduction, environmental protection.
Claims (7)
1. polycarbonate/spun glass alloy, its composition of raw materials is made up of each component of following parts by weight:
30～50 parts of polycarbonate;
30～50 parts of polycarbonate regenerated materials;
0.3～0.5 part of FR2025 fireproofing agent;
0.5～2 part of titanium oxide;
9.5～11.5 parts in spun glass;
2～5 parts of EMA;
0.1～0.5 part of antioxidant 1010;
168 0.1～0.5 part in oxidation inhibitor;
0.3～0.5 part of anti UV agent UV-531;
0.03～0.08 part of spread powder EBS;
0.04～0.08 part of ultramarine blue toner;
0.02～0.04 part of red iron oxide toner;
0.005～0.01 part of high temperature resistant fluorescent yellow toner.
2. the preparation method of the said polycarbonate of claim 1/spun glass alloy; It is characterized in that this preparation method is according to the said composition of raw materials of claim 1; Send in the twin screw extruder after polycarbonate, polycarbonate regenerated material, FR2025 fireproofing agent, titanium oxide, spun glass, EMA, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner mixed; Melting mixing under 240～290 ℃ temperature; After the gained melt is extruded by twin screw extruder; Through the tank cooling, introduce dicing machine and carry out the pelletizing operation, collect pellet and be polycarbonate of the present invention/spun glass alloy.
3. according to the said preparation method of claim 2; It is characterized in that among the said preparation method polycarbonate, polycarbonate regenerated material, FR2025 fireproofing agent, titanium oxide, spun glass, EMA, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner being mixed, is under 650～1300 rev/mins rotating speed, polycarbonate, polycarbonate regenerated material, FR2025 fireproofing agent, titanium oxide, spun glass, EMA, antioxidant 1010, oxidation inhibitor 168, anti UV agent UV-531, spread powder EBS, ultramarine blue toner, red iron oxide toner and high temperature resistant fluorescent yellow toner to be mixed.
4. according to the said preparation method of claim 2, the rotating speed that it is characterized in that twin screw extruder among the said preparation method is 250～400rPm.
5. according to the said preparation method of claim 2, used tank temperature is 60～80 ℃ when it is characterized in that said tank cooling.
6. according to the said preparation method of claim 2, the rotating speed that it is characterized in that institute's dicing machine is 600～900rpm.
7. the application of the said polycarbonate of claim 1/spun glass alloy in preparation intelligent electric meter housing or terminal row.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342884A (en) * | 2013-06-08 | 2013-10-09 | 惠州市昌亿新材料有限公司 | High-performance antistatic glass fibre reinforced polycarbonate composite material, and preparation method and applications thereof |
| CN104479319A (en) * | 2014-11-20 | 2015-04-01 | 苏州新区佳合塑胶有限公司 | Antioxidant PC/GF (polycarbonate/glass fiber) plastic for automobile tailboards |
| CN105462223A (en) * | 2015-12-21 | 2016-04-06 | 广东金发科技有限公司 | Glass fiber reinforced polycarbonate reworked material composition and preparation method thereof |
| CN106589887A (en) * | 2016-12-26 | 2017-04-26 | 广东伟的新材料股份有限公司 | Fiber-reinforced flame-retardant plastic and preparation method thereof |
| CN107118533A (en) * | 2017-05-23 | 2017-09-01 | 东至县科创塑料制品有限公司 | A kind of mildewproof plastics |
| CN110174539A (en) * | 2019-07-09 | 2019-08-27 | 湖北周一电气股份有限公司 | Intelligent ammeter box |
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| CN1439676A (en) * | 2003-03-20 | 2003-09-03 | 广州金发科技股份有限公司 | Environment protecting anti-deformation fire retardant reinforced polycarbonat and its production |
| CN102079857A (en) * | 2010-12-23 | 2011-06-01 | 天津国丰模具有限公司 | Halogen-free flame-retardant polycarbonate (PC) composition and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1439676A (en) * | 2003-03-20 | 2003-09-03 | 广州金发科技股份有限公司 | Environment protecting anti-deformation fire retardant reinforced polycarbonat and its production |
| CN102079857A (en) * | 2010-12-23 | 2011-06-01 | 天津国丰模具有限公司 | Halogen-free flame-retardant polycarbonate (PC) composition and preparation method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342884A (en) * | 2013-06-08 | 2013-10-09 | 惠州市昌亿新材料有限公司 | High-performance antistatic glass fibre reinforced polycarbonate composite material, and preparation method and applications thereof |
| CN103342884B (en) * | 2013-06-08 | 2015-12-09 | 惠州市集和光电科技有限公司 | A kind of high performance antistatic glass fiber-reinforced polycarbonate matrix material and its preparation method and application |
| CN104479319A (en) * | 2014-11-20 | 2015-04-01 | 苏州新区佳合塑胶有限公司 | Antioxidant PC/GF (polycarbonate/glass fiber) plastic for automobile tailboards |
| CN105462223A (en) * | 2015-12-21 | 2016-04-06 | 广东金发科技有限公司 | Glass fiber reinforced polycarbonate reworked material composition and preparation method thereof |
| CN106589887A (en) * | 2016-12-26 | 2017-04-26 | 广东伟的新材料股份有限公司 | Fiber-reinforced flame-retardant plastic and preparation method thereof |
| CN107118533A (en) * | 2017-05-23 | 2017-09-01 | 东至县科创塑料制品有限公司 | A kind of mildewproof plastics |
| CN110174539A (en) * | 2019-07-09 | 2019-08-27 | 湖北周一电气股份有限公司 | Intelligent ammeter box |
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| CN102311626B (en) | 2012-08-15 |
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