Flexible Power Cable Insulators
A composition, ethylene polymer technology, applied in the direction of insulators, insulated conductors, plastic/resin/wax insulators, etc., can solve problems such as being unsuitable for flexible cables, failing to pass thermal creep test, rigidity, etc.
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[0088] testing method
[0089] Flexural modulus (3 point flexure) - Flexural modulus (2% T cut) of cross-linked molded specimens of nominal 125 mil (3.2 mm) thickness were tested in accordance with ASTM D790 using an INSTRON Model 4201 tensile testing machine. modulus) test. The 3-point bending flexural modulus was performed on a rectangular section bar placed on two supports and loaded at 0.1 inch / minute (2.5 mm / min) with the loading nose in the middle between the supports.
[0090] Thermal Creep - Thermal creep is measured to determine the degree of cure (crosslinking) and a heat set is used to measure relaxation of the sample after thermal creep elongation. The test is based on the ICEA-T-28-562-2003 method for power cable insulation materials. Thermal creep testing was performed on 50 mil (1.3 mm) thick samples in an oven with a glass door at 150°C or 200°C under a force of 0.2 MPa stress applied to the bottom of the sample. Three test specimens of each sample were cut ...
example 1-3 and comparative example 1-5
[0102] Sample Preparation
[0103] Compositions are reported in Table 1. First at 250cm in the absence of peroxide 3 Samples were compounded in a Brabender batch mixer with a lobe rotor at 190°C and 35 revolutions per minute (rpm) for 5 minutes (for formulations containing polypropylene) or at 140°C and 35 rpm for 5 minutes (for all other compositions). The melt blended samples were removed from the mixing bucket and transferred to a roller mill where the peroxide was added and mixed for 5 minutes at 115°C.
[0104] Samples were removed from the mixer and pressed to various thicknesses for testing. For rheology (extensional viscosity and Henkie strain) measurements, melt blended samples were obtained either before or after peroxide addition and the plates were compression molded at 125°C under 500 psi pressure for 3 minutes, followed by 3 minutes at this temperature under a pressure of 2500 psi. The press was cooled to 30°C under a pressure of 2500 psi. At 30°C, the pres...
example 4-5 and comparative example 6-9
[0126] Sample Preparation
[0127] The compositions used in these examples are reported in Table 2. The blends of components A and B used in Comparative Examples 7-9 and Examples 4-5 were prepared as follows: Components A and B (weight ratio 1:1) with 500ppm IRGANOX TM A dry mixture of 1010 was compounded. Extruder conditions are reported in Table 3.
[0128] The strands leaving the die were cooled in a water bath and cut into pellets using a pelletizer.
[0129] The compositions of Examples 4-5 and Comparative Examples 6-9 were prepared as follows. 196.6 grams of polymer pellets (LDPE or a blend of components A and B) were heated at 60° C. for 2 hours in a glass jar. Perkadox TM BC-FF dicumyl peroxide was preheated separately to 60°C (above its 40°C melting point). 3.4 grams of preheated peroxide was added to the polymer pellets in the jar using a syringe and tumble blended at room temperature (23° C.) for 30 minutes. The jar was returned to the oven at 60°C overnig...
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