Research on Performance of Fire Retardant Straw/Expanded Vermiculite Composite Fire Door's Core Material
In order to make up for the deficiency of traditional firedoor's core materials in self-weight and environmental protection,fire retardant straw/expanded vermiculite composite fire core material was prepared with fire retardant straw,expanded vermiculite and refractory cement as raw materials.Several experiment were conducted,including flame retarding treatment of corn straw,preparation of fire door's core material specimen and evaluation of core material performance.The results showed that Ca3(PO4)2 produced by the reaction of Na3PO4 and CaCl2 could increase both the initial thermal decomposition temperature and carbon residue content of straw.The test of the specimen performance reveals that the dosage of foaming agent and the ratio of water to material have a great influence on the compressive strength of the specimen,and the dosage of fire retardant straw and foaming agent has a great influence on the thermal conductivity of the specimen.When the content of expanded vermiculite is 10%,the ratio of water to material is 0.55,the content of 30%hydrogen peroxide is 5.0%,and the amount of fire retardant straw is 0.5%,the specimen has the best the performance with a compressive strength of>0.4 MPa,a thermal conductivity of<0.12 W·mK-1,which is in line with the relevant specifications in the non-flammability test and calorific value test.
fire retardant strawexpanded vermiculitecementfire door's core material
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