WO2018129054A1 - Dispositif électrique changeant de couleur sensible à la température - Google Patents

Dispositif électrique changeant de couleur sensible à la température Download PDF

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Publication number
WO2018129054A1
WO2018129054A1 PCT/US2018/012198 US2018012198W WO2018129054A1 WO 2018129054 A1 WO2018129054 A1 WO 2018129054A1 US 2018012198 W US2018012198 W US 2018012198W WO 2018129054 A1 WO2018129054 A1 WO 2018129054A1
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WO
WIPO (PCT)
Prior art keywords
electrical device
thermochromic
color
temperature
polymer composition
Prior art date
Application number
PCT/US2018/012198
Other languages
English (en)
Other versions
WO2018129054A8 (fr
Inventor
Yan Gao
Nan Li
Jiansheng Chen
Cuicui SU
Ding Wang
Bo QIAO
Original Assignee
Abb Schweiz Ag
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
Priority claimed from PCT/CN2017/070111 external-priority patent/WO2018126352A1/fr
Application filed by Abb Schweiz Ag filed Critical Abb Schweiz Ag
Priority to CN201880015879.3A priority Critical patent/CN110637344B/zh
Priority to EP18736094.6A priority patent/EP3566237B1/fr
Publication of WO2018129054A1 publication Critical patent/WO2018129054A1/fr
Priority to US16/502,579 priority patent/US20190323902A1/en
Publication of WO2018129054A8 publication Critical patent/WO2018129054A8/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/20—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping using a crimping sleeve
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K9/00—Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
    • C09K9/02—Organic tenebrescent materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F23/00—Advertising on or in specific articles, e.g. ashtrays, letter-boxes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0294—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0295—Labels or tickets for tubes, pipes and the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/465—Identification means, e.g. labels, tags, markings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks
    • H01B7/324—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising temperature sensing means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/36—Insulated conductors or cables characterised by their form with distinguishing or length marks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/36—Insulated conductors or cables characterised by their form with distinguishing or length marks
    • H01B7/361—Insulated conductors or cables characterised by their form with distinguishing or length marks being the colour of the insulation or conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/36—Insulated conductors or cables characterised by their form with distinguishing or length marks
    • H01B7/365—Insulated conductors or cables characterised by their form with distinguishing or length marks being indicia imposed on the insulation or conductor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/30—Installations of cables or lines on walls, floors or ceilings
    • H02G3/32—Installations of cables or lines on walls, floors or ceilings using mounting clamps

Definitions

  • the present disclosure relates to devices or components used in conjunction with electrical equipment, such as electrical cables or wires, and, more particularly, to electrical devices that visually indicate an unsafe condition.
  • a conventional thermal monitor mechanism is placed near the electrical equipment to monitor the surrounding temperature.
  • the monitor mechanism can be a thermometer that monitors the environment (e.g., room), or an infrared device that monitors the surface temperature profile of a specific region (e.g., cables themselves or cable cabinet).
  • Electrical cables and wires are typically provided with components or devices that insulate and facilitate connection and handling of the cables and wires.
  • components or devices include cable ties that bundle groups of cables or wires together and cable connectors that enable a cable to be connected to another cable or to another electrical component.
  • a common cable tie or tie-wrap also known as a hose tie, zap-strap or zip tie, is normally made of a polymeric material and has a tape section with teeth that engages with a pawl in the head to form a ratchet so that, as the free end of the tape section is pulled, the tie-wrap tightens and does not come undone.
  • Another version of the tie-wrap allows a tab to be depressed to either adjust the tension or remove the tie-wrap.
  • Another popular design of the cable tie locking mechanism involves a metallic barb in the head slot.
  • a cable connector is typically used to connect two wires or conductors in an electrical circuit.
  • One common type of connector is a ring terminal having a copper barrel-ring component that can be mechanically crimped to the end of a wire, and a plastic sleeve that surrounds and insulates the crimped connection.
  • the plastic sleeve can be molded from thermoplastic materials, such as nylon, pvc, ETFE (Tefzel), etc.
  • the terminal connector can be color coded for different crimp size, for example, with red, blue, and yellow colors.
  • the heat generated during electricity conduction can accumulate due to the insulating characteristics of the polymeric material that houses the conductors. While the polymeric material of the cable tie or cable connector helps to prevent electrical shortage or personal injury, the polymer material limits the heat dissipation and increases the chance of unwanted temperature rise in the conducting cable. Such temperature increase in the conducting cable can cause electrical resistivity to increase, which further increases the heat generation leading to cable overheating and potential catastrophic melting or other hazardous.
  • thermochromic materials have resulted in the production of cable ties and cable connectors made from materials that will change color when subjected to a temperature change. When made from such thermochromic materials, such cable ties and cable connectors provide automatic visible indication of a potential hazardous overheating condition.
  • thermochromic materials are limited such that it is not always possible for the device to change to a desired alerting color in order to identify specific conditions.
  • thermochromic electrical device is provided.
  • the thermochromic electrical device is made of thermochromic plastic material and has a visual indicator pre-printed with regular print or ink to allow visible warning of a scalding situation when the thermochromic plastic portion fades from its original color to leave the warning visible.
  • the electric device may be any one of, for example, a cable tie, a cable connector, a terminal connector, a splice connector, and a cable jacket.
  • the electrical device generally includes a body comprising a thermochromic material having a first color at a first temperature and a second color at a second temperature, wherein the second color differs from the first color.
  • a visual indicator is supported by the body. The visual indicator has a color substantially matching the first color of the thermochromic material, wherein the visual indicator becomes visible when the thermochromic material changes to the second color to indicate a change in temperature of the electrical device.
  • the visual indicator may comprise an ink printed on an external surface of the body.
  • the visual indicator may comprise text or a pictorial image.
  • the electrical device may take the form of a cable tie comprising an elongate strap, a head attached to a first end of the strap and a locking device disposed in an aperture of the head.
  • the locking device is configured to permit a second end of the strap opposite the head to be inserted through the head aperture in a first direction and is further configured to prevent movement of the second end of the strap from the head aperture in a second direction opposite the first direction.
  • the visual indicator is supported by at least one of the strap or the head.
  • the electrical device may take the form of a terminal connector comprising an electrically conductive component and an electrically insulating sleeve.
  • the component has a first end adapted for crimped electrical connection to a conductor wire and a second end opposite the first end and the electrically insulating sleeve surrounds at least the first end of the electrically conductive component.
  • the visual indicator is supported by the sleeve.
  • the electrical device is made of a thermochromic polymer composition that comprises a base polymer material, a temperature sensitive material, which changes a color of the thermochromic polymer composition in response to a temperature change and a stabilizer, which enhances stability performance of the thermochromic polymer composition.
  • the stabilizer can be any type of stabilizer which can enhance the stability performance of the thermochromic polymer composition, especially the stability performance of the temperature sensitive material.
  • the stabilizer comprises a heat stabilizer which can enhance heat stabilization performance.
  • the stabilizer may comprise a light stabilizer, which can enhance outdoor stabilization performance, resistant to the UV light.
  • the stabilizer may comprise both the heat stabilizer and the light stabilizer.
  • a process for preparing the thermochromic polymer composition may include mixing the base polymer material, the temperature sensitive material and the stabilizer in a mechanical mixing process to obtain a mixed material, extruding the mixed material in an extrusion process to form an extrudant, and cutting the extrudant to obtain the thermochromic polymer
  • composition as a masterbatch.
  • an electrical device that provides a visual indicator of an unsafe operating condition.
  • the device may be made from a new
  • thermochromic formulation which undergoes a rapid and obvious color change in response to the variations in temperature. Thus, it could provide a visual indication of the existence of abnormal temperature increases. In this way, users can be warned and accidents will be avoided at an early stage. Therefore, maintenance cost of the electrical device formed from this thermochromic polymer composition can be reduced, and scald at a hot surface could be avoided, and thus the electrical device may add an appealing value to customer applications.
  • Figure 1 shows, in section, an exemplary cable tie of the prior art, having a head containing an aperture and locking mechanism and an extending strap, with the strap inserted into the head.
  • Figure 2a shows a first embodiment of an electrical device formed in accordance with the present invention in the form of a cable tie in a normal state.
  • Figure 2b shows the cable tie of Figure 2a in an overheated state.
  • Figure 3a shows a second embodiment of an electrical device formed in accordance with the present invention in the form of a ring terminal in a normal state.
  • Figure 3b shows the ring terminal of Figure 3a in an overheated state.
  • Figure 4 schematically illustrates a flow chart of a process for preparing the
  • thermochromic polymer composition as a masterbatch according to an embodiment of the present disclosure.
  • Figure 5 schematically illustrates a flow chart of a process for forming an electric device from the thermochromic polymer composition as a masterbatch according to an embodiment of the present disclosure.
  • the cable tie 10 of the prior art is typically an elongate molded plastic member, which is used in a manner described above to wrap around a bundle of articles (not shown in Figure 1).
  • the cable tie 10 is typically made from a plastic composition and includes a head 12 at one end thereof, a tail 16 at the other end of the head and a generally planar strap 14 therebetween.
  • the head 12 is formed as an integral portion of the cable tie 10.
  • the cable tie 10 may be constructed in a manner where the head 12 is formed separately from the strap 16.
  • the head 12 of the cable tie 10 includes an aperture 15 therethrough (shown with the strap 14 therein) for insertably accommodating the tail 16 and passage of the strap 14 therein in a first direction "A.”
  • the head 12 of cable tie 10 typically includes a locking device 18 supported by the head 12 and extending into the aperture.
  • the locking device 18 permits insertion of the strap 14 in the first direction "A” and prevents substantial movement of the strap 14 in a second direction "B" opposite the first direction upon an attempt to withdraw the strap 14 from the aperture.
  • the locking device may include a metallic barb such as shown in U.S. Patent No. 5,513,421, or an integrally formed plastic pawl such as shown in U.S. Patent No. 7,017,237.
  • the present invention involves a cable tie similar in most respects to the prior art cable tie described above.
  • the cable tie is made from a thermochromic material and is provided with a visual indicator that becomes visible when the thermochromic material changes color upon experiencing a change in temperature.
  • FIGs 2a and 2b show an electrical device according to a first embodiment of the present invention in the form of a cable tie 20 wrapped around a bundle of wires 22.
  • the cable tie 20 of the present invention is similar in most respects to the prior art cable tie 10 described above.
  • the cable tie 20 includes a head 22 at one end thereof, a tail 24 at the other end of the head and a generally planar strap 26 therebetween.
  • the head 22 includes an aperture for insertion of the tail 24 in a first direction, and further includes a locking device (not shown in Figures 2a and 2b) that prevents withdrawal of the strap 26.
  • the cable tie 20 is made from a compound including a base material and a thermochromic material such that the cable tie exhibits a first color at a first (e.g., ambient) temperature Ti, as shown in Figure 2a.
  • the cable tie 20 further includes a visual indicator 28 having a color that matches the first color of the cable tie at the first temperature TV As a result, the visual indicator 28 is not visible when the cable tie 20 is at the first temperature TV
  • the visual indicator 28 can take various forms, such as text or pictorial images.
  • the visual indicator 28 can comprise a conventional ink provided on any convenient surface of the cable tie 20, for example, by printing. It is also conceivable that the visual indicator 28 can be embedded or otherwise encapsulated by the material forming the cable tie 20.
  • the color change completes in 0.1 second to 30 minutes, once the changing temperature is reached. In another embodiment, the color change action completes in 1 second to 10 seconds. In still another embodiment, the color change action completes in 40 seconds to 200 seconds.
  • the cable tie 20 is formed of a polypropylene
  • the concentrate is compounded based on semitransparent
  • a prototype cable tie was fabricated via the injection molding of regular polypropylene pellet material Pro-Fax SD-242 and the masterbatch concentrate mixed at a ratio of 11: 1 by weight.
  • the resulting cable tie is designed to contain lwt% "Green-Colorless" thermochromic pigment, lwt% IrganoxlOlO antioxidant additive and lwt% UV-001 light stabilizer.
  • the injection molding process was carried out without change to the process parameters when no masterbatch concentrate was used.
  • a small stainless steel bar was inserted in the prototype cable tie using the same process for forming a conventional cable tie using regular polypropylene material.
  • An external strap surface of the resulting cable tie was printed with text reading "WARNING" using a VideoJet Printer CU.1520 using a green paint V416-D.
  • the resulting cable tie prototype meets regular cable tie performance standards and also provides visible warning at temperature 49°C or above.
  • the regular cable tie performance was tested against UL62275.
  • the prototype cable tie which is 7" long, passed type 1 classification tests for the ratings of 401b tensile strength at -40°C to 85°C operating temperature range for indoor use, which is the same rating of the cable tie without the additive masterbatch.
  • the cable tie was also placed in an oven to test its thermochromic capability under a heated environment.
  • the cable tie was aged at 80°C for 1000 hours. After the aging, the cable tie still can change color to reveal the warning sign at 49°C or above.
  • the cable tie is expected to pass a specific temperature-color transition test at 49°C nominal plus 3 minus 1.
  • the test involves a controlled heating plate (SmartLab HP-202DU, 300 x 300 mm, error +0.1 °C) that can increase or decrease the temperature by 1°C and maintain a plate temperature for 1 hours or longer.
  • the heating plate is in a black box that prevents heat turbulence from atmosphere.
  • the thermochromic cable tie is placed flat on the heating plate surface in the black box, it should change color starting at 48°C and completing at 50°C, with a changing time within 10 seconds the plate temperature changes.
  • the cable tie changes its color back to green (reversible) and thus conceals the warning text, indicating the surface temperature becomes safe again for human skin contact.
  • the cable tie thus formed is expected to be installed in electrical wiring applications, such as utility cabinets, datacenters, or other controlled environments, and provide visual indication that the environment of the fastened wires or cables reaches a temperature that is 49°C or above which is a scalding hazard.
  • thermochromic cable tie can be made from other colored materials.
  • the thermochromic cable tie can also be made with other base materials, such as nylon 6,6, nylon 4,6, and ETFE (Tefzel).
  • a cable tie was formed from a base material exhibiting a blue color at ambient temperature.
  • the blue cable tie partially turns semi-transparent/milky white and reveals warning texts when dipped into a cup of hot water about below boiling point.
  • the tail and part of the strap out of the hot water remains the original blue color where the warning texts are not visible.
  • a green cable tie with pre-printed warning text that is not visible at or below 48°C is formed.
  • the green cable tie will turn to semi-transparent/milky white color when the temperature is 49°C or higher.
  • This green cable tie changes its color gradually to semi- transparent/milky white when temperature rises from 44 °C to 54°C, and then changes the color back when the temperature decreases.
  • an electrical device in the form of a ring terminal 30 is formed.
  • a cable terminal connector 30, as is shown in Figures 3a and 3b, is typically used to connect two wires or conductors in an electrical circuit. Mechanical crimping is a typical method to secure the connection between the connector 30 and the conductors.
  • the ring terminal 30 generally includes a sleeve 32 made from an insulating material, which encapsulates one end of a barrel-ring component 34 made from an electrically conductive material.
  • the barrel end of the component 34 is encapsulated within the sleeve 32 and is crimped over a bare conductor of a wire 36.
  • the opposite end of the component 34 can have the shape of an enclosed ring, as in the case of a ring terminal or a fork, as in the case of a fork terminal.
  • a typical barrel-ring component 34 is made of high purity copper alloy such as electrolytic tough pitch CDA 110.
  • the copper barrel may also be plated with nickel or tin, as is known in the art.
  • the plastic sleeve 32 is molded from a thermochromic plastic material that will provide the terminal with thermochromic capability.
  • the thermochromic plastic material may be compounded with a base
  • the sleeve 32 further includes a visual indicator 38 that becomes visible when the color of the sleeve changes upon a change in temperature.
  • the visual indicator 38 may be provided as a suitable ink or paint printed on the surface of sleeve 32.
  • the visual indicator 38 can be embedded within the thermochromic plastic material forming the sleeve 32.
  • the color of the ink or paint forming the visual indicator 38 matches the color of the thermochromic plastic material forming the sleeve 32 in a normal ambient temperature condition.
  • the sleeve 32 also contains a red strip 37 of plastic through the sleeve length.
  • the terminal connector 30 When the terminal connector 30 is energized, it actively detects overheat over 90°C. At this limit temperature, the thermochromic sleeve 32 will change color or become transparent. The color indicator 38 will then no longer match the original color of the sleeve 32 and will, therefore, become clearly visible with respect to the sleeve 32. Moreover, the material of the sleeve 32 will not change back to its original color when the terminal temperature drops back to normal range, such as 25°C, so that the poor electrical connection can be readily discovered.
  • thermochromic enabled terminal connector is expected to meet performance requirements currently under UL486A and UL586B.
  • the terminal is expected to pass a specific temperature-color transition test at 90°C.
  • the test involves a controlled heating plate that can increase or decrease the temperature by 1°C and maintain a plate temperature for 1 hour or longer.
  • the heating plate is in a black box that prevents heat turbulence from atmosphere.
  • the thermochromic terminal is placed on the heating plate surface in the black box, its thermochromic material should change color starting at 88°C and completing at 94°C, with a changing time within 10 seconds the plate temperature changes.
  • thermochromic materials may be used with the present invention. These materials may include for example, ink, paint, particles, or other substance sensitive to a temperature change. However, such conventional materials have often shown weaknesses, such as long-term instability, and weak resistance to the environment and the like. Thus, in the present disclosure, there is provided a new thermochromic formulation, which can be used for, but not limited to, electrical devices.
  • thermochromic formulation which is also called as the thermochromic polymer material, may include a base polymer material, a temperature sensitive material, and a stabilizer.
  • the base polymer material is a polymer matrix, which may be any type of polymer suitable for the object electrical device (such as cable tie, a cable connector, a terminal connector, a splice connector, a cable jacket, etc.).
  • the temperature sensitive material can be a thermochromic pigment, which can be a microcapsule protected type of pigment and have reversible or semi-reversible color change property.
  • the stabilizer may include for example, heat stabilizer like antioxidant stabilizer, a light stabilizer or both thereof so as to enhance stability performance and/or the thermochromic polymer composition.
  • the weight ratio of the temperature sensitive material to the total stabilizer may be from 1:0.1 to 1: 10, and preferably, 1: 1 to 1:6.
  • the base polymer composition may comprise any one of polypropylene (PP), polyamide (PA, nylon), polytetrafluoroethylene (PTFE, Teflon), poly(ethene-co-tetrafluoroethene)(ETFE, Tefzel), polyetheretherketone (PEEK), poly(chlorotrifluoethylene-ethylene) (ECTFE), polyethylene (PE), acetal, thermoplastic polyurethane (TPU), polyvinyl chloride (PVC), polyethylene terephthalate (PET),
  • PVDF polyvinylidene difluoride
  • the temperature sensitive material may comprise one or more temperature sensitive materials with an irreversible, a semi-reversible or a reversible color change.
  • the one or more temperature sensitive materials with a semi-reversible or reversible color change may have one or more threshold temperatures ranging from about -10°C to about 70°C.
  • the one or more temperature sensitive materials may have one or more threshold temperatures ranging from about -40°C to about 300°C.
  • an electrical device such as cable tie, it is intended to indicate a temperature increase that has a scald hazardous to the human skin touch. According to American Burn Association, 49°C (120°F) is recommended as the temperature that could cause skin scald in short contact.
  • 49°C may be determined as the threshold temperature for the thermochromic polymer material.
  • a series of microcapsule protected color-changing pigments with comparable threshold temperature was selected and examined.
  • the "Green- Colorless" pigment provided by New Prismatic Enterprise Co., Ltd. can be used as the desired color-changing pigment.
  • the stabilizer can be employed as auxiliary ingredients to the temperature sensitive material.
  • the added stabilizer is used to keep the microcapsuled pigment stable especially during the high-temperature process of injection molding, and facilitate the color change sensitivity of the resulted cable tie.
  • the heat stabilizer may comprise any one or more of a hindered phenol antioxidant, a phosphite ester antioxidant and a thiosynergist material.
  • the hindered phenol antioxidant comprises any one or more of pentaerythritol tetrakys 3-(3,5-ditert- butyl -4-hydroxyphenyl) propionate (IrganoxlOlO), dibutylhydroxyphenylpropionic acid stearyl ester (Irganoxl076), 2,6- Di-tert-butyl-4-methylphenol (Irganox264), calcium bis(monoethyl (3,5-di-tert-butyl-4- hydroxylbenzyl)phosphonate) (Irganoxl425).
  • the phosphite ester antioxidant comprises any one or more of tris(2,4-di-t-butylphenyl)phosphite(Irgafos 168), and bis-(2,4-di-tert-butyl- pheny)- phosphiterythritol diphosphite(Ultranox 626).
  • the thiosynergist materials comprises 2,4 -bis(dodecylthiomethyl)-6-methylphenol (RC1726) , 2-Methyl-4,6-bis((octylthio) methyl )phenol (Irganox 1520).
  • the light stabilizer may comprise any one or more of an ultraviolet light screening agent, an ultraviolet absorbent, a light quenching agent, and a radical scavenger.
  • the ultraviolet light screening agent may comprise one or more of carbon black, zinc oxide, and titanium dioxide.
  • the ultraviolet absorbent may comprise for example benzophenone, benzotriazole, and triazine.
  • the light quenching agent may comprise for example nickel compounds; wherein the radical scavenger comprises one or more of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, benzoic acid (2,2,6,6- tetramethyl -4-piperidine) ester, etc.
  • thermochromic polymer composition as a masterbatch, the temperature sensitive material may range from about 1 wt% to about 30 wt %, based on the total weight of the thermochromic polymer composition.
  • a total amount of the temperature sensitive material may be from about 0.01 wt% to about 20%, preferably from about 0.1 wt% to about 10 wt %, and more preferably about 1 wt% to about 5 wt%, based on the total weight of the thermochromic polymer composition.
  • a total amount of the stabilizer may range from about 1 wt% to about 30wt%, and preferably about 1 wt% to about 5wt%, based on the total weight of the thermochromic polymer composition.
  • a total amount of the stabilizer may range from about 0.1 wt% to about 10%, and preferably about lwt% to about 5wt%, based on the total weight of the thermochromic polymer composition.
  • thermochromic polymer composition as provided herein.
  • the electrical device can be for example, any one of a cable tie, a cable connector, a terminal connector, a splice connector, a cable jacket, etc.
  • the thermochromic polymer composition can be used to form other electrical device than those listed.
  • the thermochromic polymer composition as provided herein in an electric device may comprise use in any one of a cable tie, a cable connector, a terminal connector, a splice connector, and a cable jacket.
  • the thermochromic polymer composition can also be used to form other electrical device than those listed, or any other devices.
  • thermochromic polymer composition as provided herein.
  • Fig. 4 illustrates an example process for preparing the thermochromic polymer composition according to an embodiment of the present disclosure.
  • the process 100 may start from a mixing sub-process 101, in which the base polymer material, the temperature sensitive material and the stabilizer are mixed together in a mechanical mixing process to obtain a mixture. Then, in an extrusion sub-process 102, the mixture may be further extruded in an extrusion process to form an extrudant. In a cutting sub-process, the extrudant may be then cut into small particulars to obtain the
  • thermochromic polymer composition as a masterbatch.
  • the masterbatch which can be further diluted by the base polymer material to form the final electrical product as desired, like a cable tie, a cable connector, a terminal connector, a splice connector, and a cable jacket.
  • Fig. 5 schematically illustrates a flow chart of a process for forming an electric device from the thermochromic polymer composition as a masterbatch according to an embodiment of the present disclosure.
  • the process 200 may start from a mixing sub-process 201, in which the thermochromic polymer composition as a materbatch is mixed with a predetermined amount of base polymer material in a mechanical mixing process. Then, in a molding sub-process 202, the mixed composition can be processed to obtain the final electrical device.
  • the molding sub-process 202 may comprise any one of: an injection molding, an extrusion molding, a calender molding, and a thermoforming molding, which can be selected based on requirements of different cases.
  • the electric device may comprise any one of a cable tie, a cable connector, a terminal connector, a splice connector, a cable jacket or any other electrical device.
  • thermochromic polymer composition examples of the thermochromic polymer composition will be described to examine its technical effect. Through the examples and test result comparisons, the skilled in the art will realize technical effects of the thermochromic polymer composition as provided in the present disclosure.
  • tests are performed on an example electrical device, i.e., the cable tie to show the effect of the thermochromic polymer composition.
  • the electrical device can also be any other electrical device like a cable connector, a terminal connector, a splice connector, or a cable jacket in addition to the cable tie.
  • the masterbatch was prepared by using a SK-26 twin-screw extruder (its screw diameter was 26 mm; its screw L/D ratio was 44) from Keya Chemical Industry Complete Equipment Co., Ltd, the content of temperature sensitive fillers in PP matrix was in a range of lwt to 30wt%.
  • the extrusion temperature was in a range of 180°C-280°C.
  • the resulted masterbatch pellets were further diluted by pure PP pellets (the diluted temperature sensitive content was in a range of O.Olwt -20 wt %).
  • the cable tie samples were produced by diluted pellets in an injection molding.
  • the injection was performed by using a PT-130 injection machine (its screw diameter is 40 mm, its screw L/D ratio is 22.5) from L.K. machinery Co., Ltd.
  • the injection temperature was in a range of 180°C-300°C.
  • Color changing- tests were performed on a SmartLab HP-303DU hot-plate with size 300 X 300 X 10mm (the temperature fluctuation was about ⁇ 0.1°C).
  • Thermochromic cable tie samples were put on the middle part of the hot-plate when heating up the hot-plate.
  • the hot-plate was placed in a black photo cabin to prevent heat turbulence from the atmosphere.
  • the heating or cooling rate was around 0.5 °C/min. During the heating or cooling process, pictures were taken for every degree centigrade of temperature change to record the color changing phenomenon.
  • the thermal analysis measurements were performed by means of DSC (differential scanning calorimetry) measurement to measure the melting temperature(Tm) and the
  • Tc crystallization temperature
  • a sample (about 5 to 10 mg) was heated from about 40°C to about 210°C at a scanning rate of 50°C/min under a nitrogen atmosphere, and was held there for 5 minutes to eliminate the thermal history. Then the sample was cooled to 40 °C at a scanning rate of 10 °C/min to examine its crystallization behavior. In addition, the sample was also heated at a scanning rate of 10 °C/min to test its melting behavior.
  • the example cable ties as provided in these Examples were intended to indicate temperature increase that had scald hazardous to the human skin touch. According to American Burn Association, 49°C (120°F) is recommended as the temperature that could cause skin scald in short contact. Thus, in these examples, 49°C was determined as the threshold temperature for the thermochromic formulation. A series of microcapsule protected color-changing pigment with comparable threshold temperature was selected and examined. The "Green-Colorless" pigment provided by New Prismatic Enterprise Co., Ltd. was finally confirmed as an example desired color-changing pigment. However, it shall be appreciated that the present disclosure is not only limited to this pigment and it is also possible to use any other pigment with any color.
  • Example Group 1 included eleven examples, i.e., Examples 1 to 11.
  • the pigment content was about lwt% based on the total weight of the cable tie.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and a heat stabilizer which is antioxidant IrganoxlOlO which had a hindered phenolic molecular structure.
  • the pigment was about lwt%, and the antioxidant IrganoxlOlO was about lwt% based on the total weight of the cable tie.
  • Examples 2 to 4 were similar to Example 1 except that the antioxidant IrganoxlOlO had different contents.
  • the antioxidant IrganoxlOlO was about 3wt% based on the total weight of the cable tie; in Example 3, the antioxidant IrganoxlOlO was about 5wt% based on the total weight of the cable tie; and in Example 4, the antioxidant IrganoxlOlO was about 10wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 1 to 4 are given in Table 1.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and a light stabilizer UV-001 which has a hindered amine molecules.
  • the pigment was about lwt%, and the light stabilizer UV-001 was about lwt% based on the total weight of the cable tie.
  • Examples 6 to 8 were similar to Example 5 except that the light stabilizer UV-001 had different contents.
  • the light stabilizer UV-001 was about 3wt% based on the total weight of the cable tie; in Example 7, the light stabilizer UV-001 was about 5wt% based on the total weight of the cable tie; and in Example 8, the light stabilizer UV-001 was about 10wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 5 to 8 are given in Table 2.
  • Example 6 PP/pigment/UV-001 1 wt% - 3 wt%
  • Example 7 PP/pigment/UV-001 1 wt% - 5 wt%
  • Example 8 PP/pigment/UV-001 1 wt% - 10 wt%
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure, and a light stabilizer UV- 001 which has a hindered amine molecules.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • antioxidant IrganoxlOlO as a heat stabilizer
  • UV- 001 which has a hindered amine molecules.
  • the pigment was about lwt%
  • the antioxidant IrganoxlOlO was about 0.5 wt%
  • the light stabilizer UV-001 was about 0.5wt% based on the total weight of the cable tie.
  • Examples 10 to 11 were similar to Example 9 except that the antioxidant IrganoxlOlO and the light stabilizer UV-001 had different contents.
  • the antioxidant IrganoxlOlO and the light stabilizer UV-001 had different contents.
  • IrganoxlOlO was about 1 wt% and the light stabilizer UV-001 was about lwt% based on the total weight of the cable tie; and in Example 11, the antioxidant IrganoxlOlO was about 3wt% and the light stabilizer UV-001 was about 3wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 9 to 11 are given in Table 3.
  • Example Group 2 includes six examples, i.e., Examples 12 to 17.
  • the pigment content was about 3wt% based on the total weight of the cable tie.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • IrganoxlOlO as a heat stabilizer
  • the pigment was about 3wt%, and the antioxidant IrganoxlOlO was about 1 wt% based on the total weight of the cable tie.
  • Example 13 was similar to Example 12 except that the antioxidant IrganoxlOlO had a different content.
  • the antioxidant IrganoxlOlO was about 5wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 12 to 13 are given in Table 4.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and a light stabilizer UV-001 which has a hindered amine molecules.
  • the pigment was about 3wt%, and the light stabilizer UV-001 was about lwt% based on the total weight of the cable tie.
  • Example 15 was similar to Example 14 except that the light stabilizer UV-001 had a different content.
  • the light stabilizer UV-001 was about 5wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 14 to 15 are given in Table 5.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure, and a light stabilizer UV- 001 which has a hindered amine molecules.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • antioxidant IrganoxlOlO as a heat stabilizer
  • UV- 001 which has a hindered amine molecules.
  • the pigment was about 3wt%
  • the antioxidant IrganoxlOlO was about 0.5 wt%
  • the light stabilizer UV-001 was about 0.5wt% based on the total weight of the cable tie.
  • Example 17 was similar to Example 16 except that the antioxidant IrganoxlOlO and the light stabilizer UV-001 had different contents.
  • the antioxidant IrganoxlOlO was about 3 wt% and the light stabilizer UV-001 was about 3wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 16 to 17 are given in Table 6.
  • Example Group 3 included four examples, i.e., Examples 18 to 21.
  • the pigment content was about 5wt% based on the total weight of the cable tie.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • IrganoxlOlO as a heat stabilizer
  • the pigment was about 5wt%, and the antioxidant IrganoxlOlO was about 5 wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Example 18 are given in Table 7.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and a light stabilizer UV-001 which has a hindered amine molecules.
  • the pigment was about 5wt%, and the light stabilizer UV-001 was about 5wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Example 19 are given in Table 8.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure, and a light stabilizer UV- 001 which has a hindered amine molecules.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • antioxidant IrganoxlOlO as a heat stabilizer
  • UV- 001 which has a hindered amine molecules.
  • the pigment was about 5wt%
  • the antioxidant IrganoxlOlO was about 2.5 wt%
  • the light stabilizer UV-001 was about 2.5wt% based on the total weight of the cable tie.
  • Example 21 was similar to Example 20 except that the antioxidant IrganoxlOlO and the light stabilizer UV-001 had different contents, wherein in Example 21, the antioxidant
  • IrganoxlOlO was about 5 wt% and the light stabilizer UV-001 was about 5wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 20 and 21 are given in Table 9.
  • Example Group 4 the pigment content was about 0. lwt% based on the total weight of the cable tie and it included Examples 22 to 25.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • antioxidant IrganoxlOlO as a heat stabilizer
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and a light stabilizer UV-001 which has a hindered amine molecules.
  • the pigment was about 0. lwt%
  • the light stabilizer UV-001 was about 0.1 wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Example 23 are given in Table 11.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless" pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure, and a light stabilizer UV- 001 which has a hindered amine molecules.
  • the pigment was about 0. lwt%
  • the antioxidant IrganoxlOlO was about 0.1 wt%
  • the light stabilizer UV-001 was about 0.1 wt% based on the total weight of the cable tie.
  • Example 25 was similar to Example 24 except that the antioxidant IrganoxlOlO and the light stabilizer UV-001 had different contents.
  • the antioxidant IrganoxlOlO was about 0.5 wt% and the light stabilizer UV-001 was about 0.5wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 24 and 25 are given in Table 12.
  • Example Group 5 included four examples, i.e., Examples 26 to 29.
  • the pigment content was about 10wt% based on the total weight of the cable tie.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • IrganoxlOlO as a heat stabilizer
  • the pigment was about 10 wt%, and the antioxidant IrganoxlOlO was about 10wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Example 26 are given in Table 13.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., and a light stabilizer UV-001 which has a hindered amine molecules.
  • the pigment was about 10wt%, and the light stabilizer UV-001 was about 10wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Example 27 are given in Table 14.
  • thermochromic polymer composition contained a base polymer material of polypropylene (PP, SD-242), a "Green-Colorless” pigment (as a temperature sensitive material) provided by New Prismatic Enterprise Co., Ltd., antioxidant IrganoxlOlO (as a heat stabilizer) which has a hindered phenolic molecular structure, and a light stabilizer UV- 001 which has a hindered amine molecules.
  • PP polypropylene
  • Green-Colorless pigment as a temperature sensitive material
  • antioxidant IrganoxlOlO as a heat stabilizer
  • UV- 001 which has a hindered amine molecules.
  • the pigment was about 10 wt%
  • the antioxidant IrganoxlOlO was about 5wt%
  • the light stabilizer UV-001 was about 5wt% based on the total weight of the cable tie.
  • Example 29 was similar to Example 28 except that the antioxidant IrganoxlOlO and the light stabilizer UV-001 had different contents.
  • the antioxidant IrganoxlOlO was about 10 wt% and the light stabilizer UV-001 was about 10 wt% based on the total weight of the cable tie.
  • the contents of respective ingredients of Examples 28 and 29 are given in Table 15.
  • Example 29 PP/pigment/lOlO+UV-001 10 wt% 10 wt% 10 wt%
  • thermochromic polymer compositions as provided in the present disclosure, six comparison cases are prepared, wherein in Case 1 to 5, only pigment was added into the PP and in Case 6, the composition was pure PP. In cases 1 to 5, the pigments are about lwt % , 3wt%, 5wt%, 0.1 wt% and 10wt%, respectively, based on the total weight of the cable tie, which respectively have similar pigment contents to those examples in Example Group 1 to 5.
  • Example Group 1 having a pigment content of lwt% and Case 1 also having a pigment content of lwt% based on the total weight of the cable tie, their color color-changing test results are illustrated in Table 17.
  • Examples 1 to 11 has a good color changing performance, which could provide a visual indication of overheat condition and a warning of hazard.
  • Example Group 2 having a pigment content of 3wt% and Case 2 also having a pigment content of 3wt% based on the total weight of the cable tie, their color color-changing test results are illustrated in Table 18.
  • Example Group 3 having a pigment content of 5wt% and Case 3 also having a pigment content of 5wt% based on the total weight of the cable tie, their color color-changing test results are illustrated in Table 19.
  • Example Group 4 having a pigment content of 0.1wt% and Case 4 also having a pigment content of 0.1wt% based on the total weight of the cable tie, their color color- changing test results are illustrated in Table 20.
  • Table 20 Color-changing test results of Example Group 4 and Case 4
  • Example Group 5 having a pigment content of 10wt% and Case 5 also having a pigment content of 10wt% based on the total weight of the cable tie, their color color- changing test results are illustrated in Table 21.
  • Example Group 1 and Case 6 the thermal performance test results are illustrated in Table 22.
  • Example Group 1 From the above thermal performance test results, it can be seen that each of Examples 1 to 11 in Example Group 1 has a similar melting temperature and a slightly decreased
  • thermochromic PP as provided in each of Examples 1 to 11 does not change the thermal performance of the PP substantially and thus they can be used in electrical devices or any other devices just like the pure PP.
  • Example Group 2 and Case 6 the thermal performance test results are illustrated in Table 23. Table 23 Thermal performance test results of Example Group 2 and Case 6
  • thermochromic PP as provided in each of Examples 12 to 17 does not change the thermal performance of the PP substantially and thus they can be used in electrical devices or any other devices just like the pure PP.
  • thermochromic PP as provided in each of Examples 18 to 21 does not change the thermal performance of the PP substantially and thus they can be used in electrical devices or any other devices just like the pure PP.
  • Example Group 4 and Case 6 the thermal performance test results are illustrated in Table 25.
  • thermochromic PP as provided in each of Examples 22 to 25 does not change the thermal performance of the PP substantially and thus they can be used in electrical devices or any other devices just like the pure PP.
  • Example Group 5 the thermal performance test results are illustrated in Table 26.
  • thermochromic PP as provided in each of Examples 26 to 29 does not change the thermal performance of the PP substantially and t thus they can be also used in electrical devices or any other devices just like the pure PP.
  • the base material for forming the thermochromic polymer composition is not limited to PP, any other suitable material like those given hereinabove may also be used as the base polymer composition.
  • the pigment is not limited to the "Green-Colorless" pigment provided by New Prismatic Enterprise Co., Ltd. either, and any other suitable pigment can be used as long as a desirable color change property can be achieved.
  • the stabilizer is not limited to only the heat stabilizer, or the light stabilizer or both of them, any other stabilizer is also possible as long as it may enhance the stability of the composition and substantially keep its thermal performance.
  • the heat stabilizer and the light stabilizer are not respectively limited to IrganoxlOlO and the light stabilizer UV-001 as well, any other suitable type of stabilizer can also be used as long as the stability of the composition can be enhanced and the thermal performance thereof can be substantially maintained.
  • the specific process parameters are described in embodiments of the present disclosure, the present disclosure is not limited there to and any other parameters may be used as long as it can obtain the thermochromic polymer composition with desirable color change properties and thermal performance.

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Abstract

Un dispositif électrique thermochromique est constitué d'un matériau plastique thermochromique et a un indicateur visuel pré-imprimé avec une impression ou une encre régulière pour permettre un avertissement visible d'une situation de brûlure lorsque la partie en plastique thermochromique voit sa couleur d'origine s'estomper pour que l'avertissement soit visible. Le dispositif électrique peut être l'un quelconque, par exemple, d'une attache de câble, d'un connecteur de câble, d'un connecteur de borne, d'un manchon connecteur et d'une gaine de câble.
PCT/US2018/012198 2017-01-04 2018-01-03 Dispositif électrique changeant de couleur sensible à la température WO2018129054A1 (fr)

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