Why can't polyurethane seal be used as hydraulic oil with water glycol?
Polyurethane, known as polyurethane, is a general term for macromolecular compounds containing repetitive urethane groups on the main chain. It is made up of organic diisocyanate or polyisocyanate with two hydroxyl or polyhydroxy compounds. The polyurethane material, very versatile and can replace the rubber, plastic, nylon, used in airport, hotel, building materials, automobile plant, coal plant, cement plant, Premium Apartment House, villas, garden landscaping, stone art park, etc..
Water glycol lubrication performance is poor, high pressure, sealing components and cylinder block of friction, fever is very serious, so require sealing material to withstand high temperature, usually use fluorine rubber material. Polyurethane is not high temperature, more than 80 degrees when the deformation under pressure, the intensity is low, simply can not use.
Water ethylene glycol is dissolved by water (35~55%) and ethylene glycol, and is added with water-soluble thickening agent, antioxidant, rust inhibitor and anti foaming agent, etc., or propylene glycol or other polymer can be used instead of ethylene glycol
