Araldite CT pbw Hardener HT pbw Filler Silica flour 200 pbw

Transcription

1 Vantico Ltd. Electronic Polymers Heavy Electrical Araldite-Casting Resin System Araldite CT 59 1 pbw Hardener HT 91 3 pbw Filler Silica flour 2 pbw Solid, hot-curing epoxy casting resin system applicable for all insulation techniques in the electrical industry. Useable as casting and impregnation resin system Large volume indoor electrical insulator parts for medium and high voltage, such as switch components, bushings, instrument transformers and dry type distribution transformers Encapsulation of large metal parts Impregnation of high voltage coils and windings Applications Conventional gravity casting process under vacuum Vacuum impregnation Processing methods Minimal increase in viscosity when stored up to 14 C High mechanical end properties of final part High thermal shock resistance Properties Edition: July 2 Replaces edition: March 2

2 Product data Araldite CT 59 At room solid, solvent-free bisphenol A epoxy resin Viscosity at 12 C DIN 5319 mpa s 3-5 Epoxy content ISO 31 equiv/kg Viscosity increase 24h at 14 C DIN 16945/ 4.5. % < 5 Density at 25 C ISO 1675 g/cm³ Flash point DIN C > 2 Volatile content ISO 3251 %. -.2 Vapour pressure at 15 C (Knudsen) Pa c. 1 Hardener HT 91 At room a solid, powdery anhydride hardener (PSA) Meltingrange C Density (solid) at 25 C ISO 1675 g/cm³ (liquid) at 13 C ISO 1675 g/cm³ Flash point DIN C 14 Vapour pressure at 13 C (Knudsen) Pa 8 Acid content % < 3 Remarks Araldite CT 59 represents an innovative development of various existing Araldite B qualities. The reactivity can be adjusted by using hardener as HT 93-1 or HT 923 respectively. Hardener HT 91 is humidity sensitive. A to high water absorption affects the reactivity of the mix and the end properties of castings. Storage Store the components at C, in tightly sealed and dry, if possible, in original containers. Product specific advise regarding storage can be found on product label Under these conditions, the shelf life will correspond to the expiry date stated on the label. After this date, the product may be processed only following reanalysis. Partly emptied containers should be closed tightly immediately after use. For information on waste disposal and hazardous products of decomposition in the event of fire, refer to the Material Safety Data Sheets (MSDS) for these particular products. 2 Vantico Ltd. July 2 Araldite CT 59/ HT 91/ Silica

3 Processing General instructions for preparing solid resin systems Long pot life is desirable in the processing of any casting resin system. The resin component melted to C, together with the dried filler and eventually further additives, will be first premixed under vacuum in the premixer. Intensive wetting of the filler is extremely important. Proper mixing will result in: - better flow properties and reduced tendency to shrinkage - lower internal stresses and therefore improved mechanical properties on object - improved partial discharge behaviour in high voltage applications. System Preparation The quantity of premix needed for a casting operation will be transferred to the final mixer and the appropriate quantity of the hardener (at room ) will be added. After reaching appr. 5 mbar of vacuum, the vacuum pump has to be turned off. Following, the mixer is turned on. After intensive mixing of 1-2 min the casting resin system is ready. The decreased to appr C and the vacuum did regulate itself automatically to appr. 8 mbar. Now it can be cast directly into the preheated moulds in the autoclave at C and under a vacuum of appr mbar. The mixing time of the premix (resin/filler) can vary from 1 to 3 hours, depending on mixing, quantity, mixing equipment and the particular application. The required vacuum is.5 to 5 mbar. The vapour pressure of the individual components should be taken into account. In the case of dielectrically highly stressed parts, we recommend checking the quality consistency and predrying of the filler. Their moisture content should be <.2%. The premix (Araldite CT 59/Silica) has, due to his minimal viscosity increase at elevated (12 C), a storage life of appr. one week Specific Instructions For data on viscosity increase and gel time of the activated mixture at various s, refer to Figs: 4.1 and 4.4. Mould Conventional vacuum casting C Demoulding times (depending on mould and casting volume) Conventional vacuum casting 4-8h Cure conditions Conventional vacuum casting 1-2h at 14 C To determine whether crosslinking has been carried to completion and the final properties are optimal, it is necessary to carry out relevant measurements on the actual object or to measure the glass transition (Tg). Different gelling and cure cycles in the manufacturing process could lead to a different crosslinking and glass transition respectively. In case higher reactivity of the reactive mix is required in order to lower demoulding times, it is recommended to add.3 pbw accelerator DY 68. Vantico Ltd. July 2 Araldite CT 59/ HT 91/ Silica 3

4 Processing System tested: CT 59 / HT 91 / Silica Mix ratio: 1 / 3 / 2 Processing Viscosities 3 [mpa s] 2 12 C 1 13 C 11 C [h] 24 Fig.4.1: Viscosity increase at 11, 12 and 13 C (measurements with Rheomat 115) (Shear velocity D = 1 s -1 ) 5 [mpa s] [ C] 15 Fig.4.2: Initial viscosity in function of (measurements with Rheomat 115, D=1 s -1 ) Gelation-/Cure Times 1 [min] [ C] 17 Fig.4.4: Geltime in function of (measured with GelnormInstrument, DIN 16945/6.3.1) [ C] 14 C 12 C 4 1E2 1E3 [min] 1E4 Fig.4.5: Glass transition in function of the cure time (isothermic reaction, IEC 16) 4 Vantico Ltd. July 2 Araldite CT 59/ HT 91/ Silica

5 Mechanical and Physical Properties System tested: CT 59 / HT 91 / Silica Mix ratio: 1 / 3 / 2 Determined on standard test specimen at 23 C Cured for 2h at 14 C Tensile strength ISO 527 MPa Elongation at break ISO 527 % E modulus from tensile test ISO 527 MPa 1-11 Flexural strength ISO 178 MPa Surface strain ISO 178 % E modulus from flexural test ISO 178 MPa Impact strength ISO 179 kj/m² 9-11 Double Torsion Test CG 216-/89 Critical stress intensity factor (KIC) MPa m ½ Specific energy at break (GIC) J/m² Heat distortion ISO 75 C Glass transition (DSC) IEC 16 C Coefficient of linear thermal expansion DIN Fig.5.2 Mean value for range: 2-6 C K Thermal conductivity similar to ISO W/mK Flammability UL 94 Thickness of specimen: 4 mm class HB Thickness of specimen: 12 mm class V1 Water absorption (specimen: mm) ISO 62 1 days at 23 C % by wt min at 1 C % by wt Decomposition (heating rate: 1K/min) DTA C c. 35 Density DIN 5599 g/cm³ Filler load % 61 1E1 G' [Pa] 1E9 G' 1E1 tan δ 1E 15 [1E-6/K] 12 1E8 1E7 tan δ. 1E-1 1E-2 1E6 1E [ C] Fig.5.1: Shear modulus (G') and mechanical loss-factor (tan δ) in function of (measured at 1 Hz.) (ISO 6721/ DIN 53445, method C) Alu Cu Fe [ C] 2 Fig.5.2: Coefficient of linear thermal expansion (α) in function of (reference : 23 C, DIN 53752) Vantico Ltd. July 2 Araldite CT 59/ HT 91/ Silica 5

6 Electrical Properties System tested: CT 59 / HT 91 / Silica Mix ratio: 1 / 3 / 2 Determined on standard test specimen at 23 C Cured for 2h at 14 C Breakdown strength Test specimen with embedded Rogowski electrodes Gap: 2 mm Voltage test according IEC kv/mm 35-4 Diffusion breakdown strength DIN/VDE 441/1 class HD 2 Temperature of specimen after test C < 23 HV arc resistance ASTM D 495 s Tracking resistance IEC 112 with test solution A CTI >6-. with test solution B CTI >6M-. Electrolytical corrosion effect DIN grade A tan δ [%] ε r [ C] 17 Fig.6.1: Loss factor (tan δ) and dielectric constant (εr) in function of (measurement frequency: 5 Hz, IEC 25/ DIN 53483) 1E 18 [Ω cm] 1E 16 1E 14 1E 12 1E 1 1E [ C] 17 Fig.6.2: Volume resistivity (ρ) in function of (measurement voltage: 1 V, IEC 93/ DIN 53482) 6 Vantico Ltd. July 2 Araldite CT 59/ HT 91/ Silica

7 Industrial hygiene Mandatory and recommended industrial hygiene procedures should be followed whenever our products are being handled and processed. For additional information please consult the corresponding Safety Data Sheets and the brochure "Hygienic precautions for handling plastics products of Ciba Specialty Chemicals (Publ. No /e). Handling precautions Safety precautions at workplace: protective clothing gloves arm protectors goggels/safety glasses respirator/dust mask Skin protection before starting work after washing Cleansing of contaminated skin Clean shop requirements Disposal of spillage Ventilation: of workshop of workplace yes essential recommended when skin contact likely yes recommended Apply barrier cream to exposed skin Apply barrier or nourishing cream Dab off with absorbent paper, wash with warm water and alkali-free soap, then dry with disposable towels. Do not use solvents Cover workbenches, etc. with light coloured paper Use disposable breakers, etc. Soak up with sawdust or cotton waste and deposit in plastic-lined bin Renew air 3 to 5 times an hour Exhaust fans. Operatives should avoid inhaling vapours. First Aid Contamination of the eyes by resin, hardener or casting mix should be treated immediately by flushing with clean, running water for 1 to 15 minutes. A doctor should then be consulted. Material smeared or splashed on the skin should be dabbed off, and the contaminated area then washed and treated with a cleansing cream (see above). A doctor should be consulted in the event of severe irritation or burns. Contaminated clothing should be changed immediately. Anyone taken ill after inhaling vapours should be moved out of doors immediately. In all cases of doubt call for medical assistance. Vantico Ltd. Electronic Polymers Registered trademark APPROVED TO ISO 9 ff All recommendations for use of our products, whether given by us in writing, verbally, or to be implied from results of tests carried out by us are based on the current state of our knowledge. Notwithstanding any such recommendations the Buyer shall remain responsible for satisfying himself that the products as supplied by us are suitable for his intended process or purpose. Since we cannot control the application, use or processing of the products, we cannot accept responsibility therefore. The Buyer shall ensure that the intended use of the products will not infringe any third party's intellectual property rights. We warrant that our products are free from defects in accordance with and subject to our general conditions of supply. 25 July, 2