CORE MATERIAL FOR A VACUUM INSULATION PANEL FORMED OF A PHENOLIC RESIN-CURED FOAM AND VACUUM INSULATION PANEL USING SAME, AND METHOD FOR MANUFACTURING SAME

摘要

The present invention relates to a core material for a vacuum insulation panel that is formed with a phenolic resin, a vacuum insulation panel using the core material, and a method for manufacturing the vacuum insulation panel. More particularly, the core material is formed with a cured phenolic resin foam having a closed cell content of 20% or less. The cured phenolic resin foam includes cells whose average diameter is adjusted to 50 to 500 mum. The cells have fine holes with an average diameter of 0.5 to 30 mum on the surfaces thereof to allow the cured phenolic resin foam to have a void content of at least 50%. The use of the cured phenolic resin foam ensures high thermal insulation performance and improved structural strength of the core material, and enables the production of the core material at reduced cost.