EP1083203A1 - Schalter - Google Patents

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Publication number
EP1083203A1
EP1083203A1 EP99900330A EP99900330A EP1083203A1 EP 1083203 A1 EP1083203 A1 EP 1083203A1 EP 99900330 A EP99900330 A EP 99900330A EP 99900330 A EP99900330 A EP 99900330A EP 1083203 A1 EP1083203 A1 EP 1083203A1
Authority
EP
European Patent Office
Prior art keywords
weight
nylon
molded product
magnesium hydroxide
reinforcement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99900330A
Other languages
English (en)
French (fr)
Inventor
Shunichi Mitsubishi Denki K. K. KATSUBE
Kazunori Mitsubishi Denki K.K. FUKUYA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1083203A1 publication Critical patent/EP1083203A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
    • H01H71/0257—Strength considerations

Definitions

  • the present invention relates to a switch having a part thereof constituted by the molded product of an insulating structure. More particularly, the present invention relates to a molded product which has a high rigidity and a high strength, maintains an insulating property after the switch is cut off, and has a flame resistance, less strain and a good surface gross and is scratched with difficulty.
  • JP-A-8-171847 has described a switch using a molded product containing a composition consisting of 45 to 80 % by weight of nylon 6, 15 to 50 % by weight of magnesium hydroxide and 5 to 40 % by weight of glass fiber.
  • the switch using the molded product containing the composition has a predetermined rigidity and strength, a predetermined creeping property, an insulating property obtained after the switch is cut off, a flame resistance and the like.
  • a dimension is changed after the molding to cause an increase in a production fraction defective, the rigidity of the obtained molded product is reduced (the predetermined rigidity is satisfied after the reduction) to further reduce the size and thickness of the molded product with difficulty, and the creeping property of the obtained molded product is deteriorated (the predetermined creeping property is satisfied after the deterioration).
  • nylon 6 is a hygroscopic resin and absorbs a water content from an atmosphere or outside air after the molding.
  • the molded product obtained immediately after the molding absorbs the water content in the atmosphere and a dimension thereof is varied.
  • the rate of the change in the dimension depends on external causes such as the storage state of the molded product or seasons.
  • the molding of the molded product and the assembly of the switch are carried out apart from each other, and the assembly is carried out after several hours to several weeks since usual modification in order to enhance a working efficiency. Accordingly, if the external dimension of the molded product is greatly changed for a short period of time of several hours to several weeks after the molding, particularly, gets out of an allowable dimension, the molded product cannot be used as a part for assembly. Consequently, the production fraction defective caused by the assembly efficiency of the switch is affected.
  • the present invention has been made to solve the above-mentioned problems and has an object to provide a switch having a part thereof constituted by a molded product of an insulating structure in which nylon 6 or nylon 6 based alloy, a reinforcement and magnesium hydroxide contained in an organic and inorganic complex composition are distributed at a specific rate, resulting in a high insulating property after cut-off, a small change in a dimension after molding and a low production fraction defective, and to further provide a switch having a part thereof constituted by a molded product of an insulating structure which has an insulating property after the switch is cut off, a flame resistance, a small change in a dimension after the molding, a low production fraction defective, a high rigidity and excellent creeping resistance after the molding.
  • the present invention has an object to provide a switch having a part thereof constituted by a molded product of an insulating structure in which nylon 6 or nylon 6 based alloy, a reinforcement, magnesium hydroxide and an inorganic matter having the effect of suppressing the orientation of the reinforcement are distributed at a specific rate, resulting in a smaller change in a dimension after molding and a lower production fraction defective, and a higher rigidity and creeping resistance after the molding.
  • the present invention has an object to provide a switch having a part thereof constituted by a molded product of an insulating structure which has a good surface gross and is scratched with difficulty.
  • a switch according to the present invention has a part thereof constituted by a molded product of an organic and inorganic complex composition containing 35 to 50 % by weight of nylon 6 or nylon 6 based alloy, 15 to 25 % by weight of reinforcement and 30 to 40 % by weight of magnesium hydroxide. Therefore, the switch has a high insulating property after cut-off, a small change in a dimension after molding and a low production fraction defective.
  • nylon 6 or nylon 6 based alloy 20 to 25 % by weight of reinforcement and 30 to 35 % by weight of magnesium hydroxide are contained. Therefore, it is possible to easily carry out the molding within a wide molding condition range such as a fused resin temperature or a mold temperature and the deposition of the reinforcement and the magnesium hydroxide on the surface is lessened.
  • the molded product is a housing, it is one of the greatest components of a circuit breaker and effectively contributes to a reduction in the production fraction defective.
  • a part is constituted by a molded product consisting of an organic and inorganic complex composition containing 35 to 45 % by weight of nylon 6 or nylon 6 based alloy, 15 to 25 % by weight of reinforcement, 30 to 40 % by weight of magnesium hydroxide and 5 to 15 % by weight of inorganic matter having less orientation. Therefore, a high insulating property can be obtained after the cut-off and a change in a dimension and a production fraction defective can be more reduced after the molding.
  • the inorganic matter is burned clay and/or wallastnite, the molded product is scratched with difficulty.
  • the molded product is a housing, it is one of the greatest components of the circuit breaker and effectively contributes to a reduction in the production fraction defective.
  • the molded product is the base of the housing, a great surface gross can be obtained and the surface is scratched with difficulty, which is preferable.
  • a molded product of an insulating structure constituting a part of a switch according to the present embodiment is obtained by injection molding, into a metal mold, an organic and inorganic complex composition containing 35 to 50 % by weight of nylon 6 or nylon 6 based alloy, 15 to 25 % by weight of reinforcement and 30 to 40 % by weight of magnesium hydroxide.
  • an organic and inorganic complex composition containing 35 to 50 % by weight of nylon 6 or nylon 6 based alloy, 15 to 25 % by weight of reinforcement and 30 to 40 % by weight of magnesium hydroxide.
  • a black color based molded product is to be molded, a black color based dye or black carbon is added to the organic and inorganic complex composition, for example.
  • nylon 6 based alloy examples include nylon 6 and nylon 66, nylon 6 and acrylonitrile-butadiene copolymer (ABS), nylon 6 and denatured polyphenylene oxide (denatured PPO), nylon 6 and MXD 6, and nylon 6, nylon 66 and MXD 6, all of them have lower resin fusing temperatures during molding than the dehydration temperature of magnesium hydroxide. Accordingly, when the nylon 6 or the nylon 6 based alloy and the magnesium hydroxide are to be kneaded and-a material obtained by the kneading is to be molded, the magnesium hydroxide is rarely dehydrated.
  • the reinforcement includes one or more selected from a group consisting of glass fiber or ceramic fiber.
  • the glass fiber has a diameter of 1 to 15 ⁇ m and an aspect ratio of 10 or more.
  • Fig. 1 is a perspective view showing the base (a width of 90 mm X a length of 155 mm X a height of 40 mm) of a housing of a breaker.
  • a denotes an external dimension in a cross direction and a dimensional tolerance is 89.5 to 90.0 mm.
  • an external dimension a 0 in a cross direction of 89.5 mm to 89.6 mm is obtained immediately after the molding
  • it is held for 240 hours in a thermohygrostat bath maintained at 30°C and a humidity of 90 %.
  • a molded product having a composition consisting of 70 % by weight of nylon 6, 20 % by weight of magnesium hydroxide and 10 % by weight of glass fiber as a reinforcement was used.
  • Table 1 shows the results of the test.
  • X represents rejection
  • ⁇ and o ⁇ represent acceptance
  • o ⁇ implies that the dimensional difference ⁇ a is very small, the dimension a belongs to almost the center of the dimensional tolerance and a change in the change is more preferred.
  • Nylon 6 or nylon 6 based alloy Magnesium hydroxide Reinforcement Comparative example 1 Nylon 6 (70 % by weight) Magnesium hydroxide (20 % by weight) Glass fiber (10 % by weight) Rejection X (89.86-90.06) Sample 1 Nylon 6 (50 % by weight) Magnesium hydroxide (30 % by weight) Glass fiber (20 % by weight) Acceptance ⁇ (89.75-89.95) Sample 2 Nylon 6 (45 % by weight) Magnesium hydroxide (35 % by weight) Glass fiber (20 % by weight) Acceptance ⁇ (89.72-89.92) Sample 3 Nylon 6 (40 % by weight) Magnesium hydroxide (40 % by weight) Glass fiber (20 % by weight) Acceptance o ⁇ (89.70-89.90) Sample 4 Nylon 6 (35 % by weight) Magnesium hydroxide (40 % by weight) Glass fiber (25 % by weight) Acceptance
  • the dimension a does not range within the dimensional tolerance in the molded product of the comparative example 1, while the dimension a ranges within the dimensional tolerance and good results of the change in the dimension were obtained after moisture absorption in the samples 1 to 4.
  • the molded product of the comparative example 1 can be normally assembled if it is used for assembling a switch immediately after the molding, for example.
  • the molded product cannot be stored for a short period of time of several hours to several weeks (240 hours in the test) after the molding and is not preferable in respect of productivity.
  • the change in the dimension after the moisture absorption tends to be reduced. If the nylon 6 or the nylon 6 based alloy is less than 35 % by weight, the reinforcement and the magnesium hydroxide tend to be kneaded with difficulty during material kneading. On the other hand, if the nylon 6 or the nylon 6 based alloy exceeds 50 % by weight, a coefficient of moisture absorption of the molded product made of the organic and inorganic complex composition tends to be raised, the change in the dimension after the molding tends to be increased, the rigidity of the molded product tends to be reduced and creeping performance tends to be deteriorated.
  • nylon 6 or nylon 6 based alloy it is preferable that 35 to 50 % by weight of nylon 6 or nylon 6 based alloy should be contained.
  • the strength of the molded product made of the organic and inorganic complex composition tends to be reduced if the content of the reinforcement is less than 15 % by weight and that the orientation of the reinforcement tends to become greater and the strain of the molded product tends to be increased if the content of the reinforcement is equal to more than 25 % by weight. Accordingly, it is preferable that 15 to 25 % by weight of the reinforcement should be contained.
  • the samples 1 and 2 are used, that is, 45 to 50 % by weight of nylon 6 or nylon 6 based alloy, 20 % by weight of reinforcement and 30 to 35 % by weight of magnesium hydroxide are contained, the molding condition range such as a fused resin temperature or a mold temperature was increased and the deposition of the reinforcement and the magnesium hydroxide on the surface of the molded product was lessened after the molding when the organic and inorganic complex composition is to be kneaded and the kneaded composition is to be then injection molded.
  • the molded product can be molded easily and can have a smooth surface. Moreover, when a black color based dye is added to the organic and inorganic complex composition, a black color based molded product is obtained. If the organic and inorganic complex composition has the same composition, the deposition of the reinforcement and the magnesium hydroxide on the surface of the molded product is lessened. Therefore, it is possible to obtain the molded product having less whitening and good appearance. In particular, since the appearance of housing is important, it is preferable that the molded product should be applied to the housing. Furthermore, the molding condition range such as a fused resin temperature or a mold temperature is wide.
  • the base and cover of a housing having a more complicated structure than a handle particularly, the complicated shape of the base.
  • the base and cover of the housing are greater than parts such as a handle or a cross bar. Therefore, a great temperature gradient is generated before and after the molding. If the composition has the wide molding condition range such as the fused resin temperature or the mold temperature, the degree of freedom of the molding conditions such as temperature control can be increased, resulting in contribution to the base and the production efficiency of the base.
  • the samples 2 to 4 are used, that is, 35 to 45 % by weight of nylon 6 or nylon 6 based alloy, 20 to 25 % by weight of reinforcement and 35 to 40 % by weight of magnesium hydroxide are contained, the change in a dimension after the molding is more reduced, the change in the dimension after the molding is reduced and the production fraction defective is lower.
  • the samples 3 and 4 are used, that is, 35 to 40 % by weight of nylon 6 or nylon 6 based alloy, 20 to 25 % by weight of reinforcement and 40 % by weight of magnesium hydroxide are contained, the change in the dimension after the molding is very reduced and the production fraction defective is very low.
  • nylon 6 has been described as the nylon 6 or the nylon 6 based alloy in the explanation of the samples 1 to 4 in the test, almost the same results for the change in the dimension after the molding can be obtained in the case of the nylon 6 based alloy.
  • the features of the nylon 6 and the nylon 6 based alloy will be described below. Since the nylon 6 based alloy is made of a material having a lower hygroscopic property than that of the nylon 6, it is more effective in the change in the dimension after the moisture absorption than the nylon 6. On the other hand, it has been found that the nylon 6 and an alloy of the nylon 6 and nylon 66 have higher insulation performance after cut-off than the nylon 6 based alloy (excluding the alloy of the nylon 6 and the nylon 66).
  • the nylon 6 or nylon 6 based alloy contained in the organic and inorganic complex composition, the reinforcement and the magnesium hydroxide are distributed at a specific rate. Therefore, a high insulating property can be obtained after the switch is cut off, a flame resistance can be obtained, a change in a dimension after molding can be reduced, a production fraction defective is low, a high rigidity can be obtained after the molding, and a creeping resistance can be enhanced.
  • the molded product does not use a halogen or phosphorus based additive as a flame retardant. Therefore, there is no possibility that dioxin or phosphine might be generated during combustion. Thus, the molded product is nontoxic and preferable.
  • nylon 6 or nylon 6 based alloy itself has a comparatively high decomposition temperature as a resin, it can contribute to an enhancement in the insulation performance after the cut-off.
  • compositions of the samples 1 and 2 have wide molding condition ranges such as a fused resin temperature or a mold temperature and the deposition of the reinforcement and the magnesium hydroxide on the surface is lessened, they are more preferable for productivity and appearance.
  • compositions of the samples 3 and 4 have a very small dimensional difference ⁇ a and the a dimension a belonging to almost the center of the dimensional tolerance, it is more preferable for a change in the dimension after moisture absorption.
  • the base of the housing of the breaker has been described as the molded product, other parts, for example, a cover, a handle and a cross bar may be used.
  • a housing constituted by the cover, the base or the cover and base is one of the parts having the greatest whole length constituting the switch. Therefore, the influence of the change in a dimension after the molding can be reduced and the production fraction defective can be reduced efficiently by using the molded product having the composition according to the present embodiment, which is preferable.
  • the change in the dimension of the molded product rarely affects the performance of the switch after the assembly because the molded product has a part thereof fixed by other parts through the assembly.
  • a molded product of an insulating structure constituting a part of the switch according to the present embodiment is obtained by injection molding, into a metal mold, an organic and inorganic complex composition containing 35 to 45 % by weight of nylon 6 or nylon 6 based alloy, 15 to 25 % by weight of reinforcement, 30 to 40 % by weight of magnesium hydroxide and 5 to 15 % by weight of inorganic matter having less orientation.
  • Examples of the inorganic matter having less orientation include alumina, burned clay, unburned clay, silica, calcium silicate, magnesium oxide, calcium carbonate, magnesium carbonate, talc, mica and wallastnite.
  • alumina burned clay, unburned clay, silica, calcium silicate, magnesium oxide, calcium carbonate, magnesium carbonate, talc, mica and wallastnite.
  • the burned clay, the silica, the calcium carbonate and wallastnite are preferred. Furthermore, the burned clay and the wallastnite are preferred because they are scratched with difficulty.
  • Fig. 2 is a perspective view showing the cover (a width of 90 mm X a length of 155 mm X a height of 28 mm) of a housing of a breaker.
  • Fig. 3 is a view showing the cover illustrated in Fig. 2 seen in the A direction of Fig. 2, that is, a front view.
  • b represents a strain.
  • the molded product was molded (an external dimension a 0 in a cross direction of 89.5 mm to 89.6 mm is obtained immediately after the molding), and was then left for 24 hours at an ordinary temperature and moisture and a strain b of the molded product was measured.
  • the strain was measured for 100 molded products in total. Acceptance is given to 97 or more molded products having a strain of 0.5 mm or less, and rejection is given to 96 or less molded products having a strain of 0.5 mm or less.
  • X represents the rejection and ⁇ and o ⁇ represent acceptance. o ⁇ is the most preferable because a variation in the strain is very small (the standard deviation of the strain is small).
  • a molded product (part) passing through a normal producing process comprising a step of fetching a molded product from a metal mold by means of an automatic fetch machine and putting the molded product on a belt conveyer, a step of packing the molded product on the belt conveyer into a box, a step of delivering the molded product packed in the box and a step of fetching the molded product packed in the box to be assembled, an external surface was checked and a fraction defective obtained during the delivery of the part was calculated.
  • rejection was given to the case in which the external surface (design surface) has three or more scratches having a length of 2 mm or more, and acceptance was given to the case in which the external surface has two or less scratches having a length of 2 mm or more.
  • the external surface is seen from side surfaces 1 ⁇ and 2 ⁇ and a top surface 3 ⁇ in Fig. 2.
  • the fraction defective obtained during the delivery of the part was measured for 1000 molded products in total.
  • a molded product having a composition consisting of 50 % by weight of nylon 6, 25 % by weight of magnesium hydroxide and 25 % by weight of glass fiber as a reinforcement As a comparative example 3, there was used a molded product having a composition consisting of 50 % by weight of nylon 6, 40 % by weight of magnesium hydroxide and 10 % by weight of glass fiber as the reinforcement.
  • X represents rejection and ⁇ and o ⁇ represent acceptance.
  • o ⁇ implies the case in which the fraction defective is very good (a fraction defective of 0.6 % or less).
  • the molded product of the comparative example 2 has a good fraction defective obtained during the part delivery and a great strain, while the molded product of the comparative example 3 has a small strain and a high fraction defective during part delivery which does not range within a tolerance.
  • the samples 5 to 8 had strains ranging within an allowable maximum value of 0.5 mm and a fraction defective during part delivery of 1.0 % or less. Thus, good results were obtained.
  • the samples 7 and 8 that is, 35 to 40 % by weight of nylon 6 or nylon 6 based alloy, approximately 15 % by weight of glass fiber (reinforcement), 30 to 35 % by weight of magnesium hydroxide and approximately 15 % by weight of wallastnite (an inorganic matter having less orientation) are contained, it was found that the strain and the fraction defective during part delivery are very excellent.
  • all the molded products related to the samples 5 to 8 according to the present embodiment having the inorganic matter with less orientation for the composition have a very small dimensional difference ⁇ a and a dimension a belonging to almost the center of a dimension tolerance, which are more preferred results for a change in the dimension.
  • the nylon 6 or nylon 6 based alloy, the reinforcement, the magnesium hydroxide and the inorganic matter having less orientation which are included in the organic and inorganic complex composition are distributed at a specific rate. Therefore, a high insulating property can be obtained after the switch is cut off, a flame resistance can be obtained, a change in a dimension after molding can be reduced, a production fraction defective is low, a high rigidity can be obtained after the molding, a creeping resistance can be enhanced, and the fraction defective during part delivery can be decreased.
  • the molded product according to the present embodiment can have considerably excellent strain and fraction defective during part delivery and production fraction defective can be reduced rapidly.
  • the surface gross of the molded product is great. Furthermore, if the burned clay and the wallastnite are used, the molded product is scratched with difficulty. Accordingly, the molded product according to the present embodiment is considerably excellent in that it has a great surface gross and is scratched with difficulty as compared with the molded product which does not use the inorganic matter having less orientation according to the above-mentioned embodiment.
  • cover of the housing of the breaker has been described as the molded product, other parts, for example, a base, a handle and a cross bar may be used.
  • the housing such as the cover or the base is a part having the greatest whole length. Therefore, the strain can be decreased and the production fraction defective can be reduced efficiently by using the molded product having a composition according to the present embodiment, which is preferable. Furthermore, if the molded product having the composition according to the present embodiment is used for the cover of the housing, the surface is scratched with difficulty, which is preferable.
  • the switch according to the present invention can be applied to a switch having a small size and a high breaking capacity.

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  • Compositions Of Macromolecular Compounds (AREA)
EP99900330A 1999-01-18 1999-01-18 Schalter Withdrawn EP1083203A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/000121 WO2000042107A1 (fr) 1999-01-18 1999-01-18 Commutateur

Publications (1)

Publication Number Publication Date
EP1083203A1 true EP1083203A1 (de) 2001-03-14

Family

ID=14234723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99900330A Withdrawn EP1083203A1 (de) 1999-01-18 1999-01-18 Schalter

Country Status (4)

Country Link
EP (1) EP1083203A1 (de)
KR (1) KR20010106098A (de)
CN (1) CN1158353C (de)
WO (1) WO2000042107A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4131313A4 (de) * 2020-04-02 2024-04-03 LS Electric Co., Ltd. Lichtbogenlöschanordnung und schutzschalter damit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002289083A (ja) * 2001-03-23 2002-10-04 Mitsubishi Electric Corp 回路遮断器
CN100434936C (zh) * 2006-11-07 2008-11-19 西安交通大学 一种光开关低温有机-无机复合薄膜材料的制备方法
KR100924922B1 (ko) * 2009-06-05 2009-11-05 주식회사 비츠로테크 일체형 전원절환개폐기
CN111171563A (zh) * 2020-03-06 2020-05-19 广州华新科智造技术有限公司 聚酰胺材料及制备方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378750A (en) * 1993-01-07 1995-01-03 Bayer Aktiengesellschaft Flame-retardant polyamide molding compounds
DE4307682A1 (de) * 1993-03-11 1994-09-15 Basf Ag Halogenfreie flammgeschützte thermoplastische Polyamidformmassen
JPH06290637A (ja) * 1993-03-30 1994-10-18 Hitachi Cable Ltd 難燃性電気絶縁組成物，及びそれを用いた絶縁電線
JP3016344B2 (ja) * 1994-12-19 2000-03-06 三菱電機株式会社 開閉器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0042107A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4131313A4 (de) * 2020-04-02 2024-04-03 LS Electric Co., Ltd. Lichtbogenlöschanordnung und schutzschalter damit

Also Published As

Publication number Publication date
CN1158353C (zh) 2004-07-21
KR20010106098A (ko) 2001-11-29
WO2000042107A1 (fr) 2000-07-20
CN1293699A (zh) 2001-05-02

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