The present invention relates to a method of preparation and modification of materials which are used mainly in the construction industry and which are exposed to aggressive atmospheric conditions, protecting them against the harmful effects of ultraviolet radiation and ozone. The method consists in preparing a solution of stilbene derivatives and, according to the invention, the stilbene derivatives are grafted, at the temperature of up to 55°C in the presence of water - with carbonic acid diamide, and subsequently the material, like plastics, cement or concrete, is being directly treated with the so prepared modifiers and/or the active radicals of the said modifiers are built-in the surface of these materials and/or are introduced through monomers or the reacting components during chemical hardening, foaming, polymerization or condensation.
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