The Research On Composite Technology Of Foam Insulation Board

Polystyrene foam has good insulation properties, high energy efficiency, to eliminate thewall temperature gradient, high strength, light texture, etc.; but flammable and emit toxicfumes of combustion, is building one of the sources of fire. Phenolic foam has good flameretardant, low smoke and low toxicity advantages, but easy to swap powder, brittleness, poorperformance foam extension. The two main external wall insulation foam in practicalapplications are severely limited. Therefore, this study intends to use EPS beads and bodywith phenolic resin and other additives composite foam new technology, designed to study anew set of fire safety, energy-saving insulation, good construction, durability, mechanicalexcellent performance and good value for money as one composite plastic foam insulation,which works for the building’s exterior wall that needed green energy-saving insulation andfire safety materials to provide a new product.Firstly, By single factor test method, study identified two matching ratio, a surfactant, afoaming agent, a curing agent, polyethylene glycol and molding temperature range ofparameters, find out the influence of composite foam insulation board on the performance. Bymeans of stirring process parameters on the effects of compound foam insulation plasticresearch, the best stirring process parameters is determined. The experimental results showedthat: When mixing speed200rad/min, time3min, mixing time is3min, the preparation ofcompound foam relatively optimal performance. Find the best process parameters throughfurther optimization of the orthogonal experiment. The results of Orthogonal experimentshow that the optimum for the: molding temperature is65℃, two matching ratio of9:8,6parts surfactant, a foaming agent to16parts,22parts hardener dosage. Obtained by optimumcomposite foam properties are as follows: Apparent density110kg/m3, thermal conductivity0.02870w/m k, compressive strength0.6095MPa, oxygen index of35.3%, pore size285μm,the dregs rate of4.3%, water rate of2.9%.Secondly, the composite foam cell morphology was observed by SEM to study therelationship between composite foam cell structure and performance. The results showed that: with the increase of the apparent density, the thermal conductivity is gradually increased, thecompressive strength increased, the cell diameter decreases. When the Plastic compositefoam insulation with an apparent density close to the aperture increases as the thermalconductivity is increased, the compressive strength was significantly lower. By comparisonwith the performance of phenolic foam and EPS foam, syntactic foam density is large,limiting oxygen index lower than phenolic foam, the other properties are better than phenolicfoam and EPS foam.Finally, under the premise of meeting composite foam plastic insulation using the desiredmechanical properties and flame retardancy by adjusting the composite technology, reducingthe apparent density syntactic foam, thereby enhancing the syntactic foam insulationperformance, reduce production costs and get a cost-effective higher, with the marketcompetitiveness of EPS/PF composite foam plastic insulation. The results show that: theamount of phenolic resin25g, EPS1000ml, the size of the beads with the ratio of1:1to obtainthe syntactic foam compressive strength0.1MPa or more, reduced the apparent density of40kg/m3, costs reduced by70%. When a higher compressive strength requirements, may bepreferred to increase the compressive strength of fly ash as a filler composite foam insulationboard. Fly cheap and readily available, low economic cost. When oxygen index higher,preferably expandable graphite as a filler to increase the oxygen index of the composite foaminsulation board.