Graphite Polystyrene Infiltration Flame Retardant Composite Insulation Board

Insulation materials can be divided into organic materials,inorganic materials and composite materials according to their composition.Among them,organic material type materials have excellent properties such as low apparent density,light texture,good thermal insulation and low thermal conductivity.However,organic matter is easy to burn,and its burning rate is very fast.However,the inorganic insulation board material has a large apparent density,which directly leads to a large bulk density of inorganic insulation materials,and the insulation performance of inorganic insulation materials is indeed inferior to that of organic insulation materials.For this reason composite thermal insulation material is the inevitable trend of building energy-saving material development.In this paper,the composite of graphite polystyrene insulation board and magnesia permeable flame retardant is discussed,and the related properties are studied.The properties of the graphite polystyrene substrate were studied firstly.The apparent density was 18 kg/m3,the thermal conductivity was 0.030 W/(m-K)and the tensile strength was 0.06 MPa.perpendicular to the plate surface.and the microscopic thermogravimetric and differential thermal experiments were tested on the graphite polystyrene substrate,and the thermogravimetric and differential thermal experiments were analyzed.Secondly,the properties of magnesium permeable flame retardants were studied,according to the ratio of magnesium oxide to magnesium sulfate at 3:1,5:1,5:1(adding fly ash)7:1,the compressive strength and microscopic thermogravimetric and differential thermal experiments showed that the compressive strength was 58.8 at 5:1 MPa,DSC and the total heat absorption area of the curve was 2242 J/g..In addition,the effects of the addition of alumina,sodium silicate,and phosphoric acid on the strength and thermal properties of magnesium permeable flame retardants were investigated under the condition of optimal ratio.The properties of graphite polystyrene permeable flame retardant composite insulation board were tested.The experimental results showed that the bulk density of the board was 90 kg/m3,the tensile strength perpendicular to the surface was 0.1 MPa,the thermal conductivity was 0.039 W/(m-K),the softening coefficient was 0.9,and the combustion performance was A2 grade.Thermal analysis shows that graphite polystyrene thermal insulation has the ability of flame retardancy of B1 grade,and the composite of magnesium permeable flame retardants can meet the A2 grade requirement of calorific value less than 3 MJ/Kg.The flame retardant mechanism of magnesia permeable flame retardant is that water and product are decomposed by heat to absorb a large amount of heat,which reduces the surface temperature of polymer,thus preventing the thermal degradation effect of polymer,that is,heat absorption and flame retardancy at suitable temperature.In addition,magnesia flame retardants decompose to form non-combustible magnesium oxide when heated and form a protective layer covering the polymer surface,thus preventing the external air and heat from entering into the matrix material and preventing the combustible gas from escaping.