Heat-resistant electrically insulating sheet material and method for producing same
A technology of electrical insulation and heat resistance, which can be used in insulators, organic insulators, plastic/resin/wax insulators, etc., and can solve problems such as insufficient electrical insulation.
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Embodiment
[0040] (test methods)
[0041] (1) Determination of weight and thickness per square meter
[0042] Implemented in accordance with JIS C2111.
[0043] (2) Calculation of density
[0044] Calculated by weight per square meter ÷ thickness.
[0045] (3) Length-weighted average fiber length
[0046] The length-weighted average fiber length of about 4000 microparticles was measured using a Fiber Quality Analyzer manufactured by Op Test Equipment.
[0047] (4) Determination of tensile strength
[0048] The TENSILON tensile testing machine was implemented under the conditions of a width of 15 mm, a distance between chucks of 50 mm, and a tensile speed of 50 mm / min.
[0049] (5) Insulation breakdown voltage
[0050] According to ASTM D149, it was carried out by the direct boost method using alternating current under the condition of an electrode diameter of 51 mm.
[0051] (raw material preparation)
[0052] The fibrids of poly-m-phenylene isophthalamide were produced using the...
Embodiment 4～6）
[0065] (Preparation of particulate raw materials)
[0066] The above calendered aramid paper was pulverized with a dry pulverizer. Prepare the mixed slurry of the material, aramid fibrids, and water that have passed through a sieve with an opening diameter of 3 mm, and process the slurry with a dissociation machine and a knocking machine, and the length-weighted average fiber length is formed as shown in Table 2. Adjust the dimensions shown.
[0067] (Manufacture of heat-resistant electrical insulating sheets)
[0068] A mixture of aramid paper and aramid fibrids was pulverized to prepare microparticles, and the prepared microparticles and aramid short fibers were each dispersed in water to prepare a slurry. These slurries were mixed so that fine particles, fibrids, and aramid short fibers were formed into the compounding ratio (weight ratio) shown in Table 2, using a Tappi type hand sheet machine (cross-sectional area 625 cm 2 ) to make flakes. Next, this was subjected to...
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