Soft polyurethane foam plastic prepared by rape oil

A soft PUR foam prepared by using rapeseed oil, is produced according to the following steps: 1) taking rapeseed oil and epoxy agent for epoxidation reaction in the presence of catalyst, 2) taking epoxy rapeseed oil and nucleophilic reagent containing reactive hydrogen for epoxy ring opening reaction to generate the mixed hydroxy fatty acids triglycerides, 3) adding alcoholysis agent for alcoholysis reaction to generate bio-radical polyol, 4) conducting bio-radical polyol and oxy-olefin for polyaddition reaction to generate the bio-radical polyether polyol, 5) taking bio-radical polyether polyol and polyether polyol and / or polyester polyol as raw materials, supported by catalyst, foam stabilizer, foaming agent to prepare combined polyether polyol, 6) mixing the combined polyether polyol and isocyanate evenly for foaming reaction to produce the invention.