Toughened modified phenolic foam and preparation method thereof

The invention discloses toughened modified phenolic foam and a preparation method thereof. The toughened modified phenolic foam comprises one or more of tar crude phenol, crude phenol, cardanol and phenol, sodium hydroxide, a formaldehyde solution, paraformaldehyde, H2SO4, p-toluenesulfonic acid, ethylene glycol, n-pentane, polysorbate-80, diphenylmethane diisocyanate and polypropylene glycol 2000. According to the toughened modified phenolic foam and the preparation method thereof, tar crude phenol is adopted to replace part of phenol to react with paraformaldehyde to prepare mixed phenolic foam, the mixed phenol just has a certain toughening effect, the brittleness of single phenolic foam is improved, the product performance is improved, meanwhile, the phenol is replaced by the crude phenol, and the toughness of the product is improved. The cost of the product can be greatly reduced, the environment is seriously polluted due to the fact that the crude phenol is usually burnt out as coking waste, the waste c