Low Cost And High Flame Retardant Of Study On Urea-formaldehyde Resin And Its Foam

China's building energy consumption accounts for 30% of the total energy consumption in 2014,and the proportion of building energy consumption is increasing,which consumes a lot of resources of our country,so the building exterior wall thermal insulation is more and more important.Commonly used building exterior wall thermal insulation materials mainly include organic heat preservation material and inorganic heat preservation material.Being used a period of time,the heat preservation of inorganic heat preservation material effect will be worse.Inorganic heat preservation material has rarely used in the outer wall heat preservation at present.Commonly used organic heat preservation material is expanded polystyrene foam(XPS),extruded polystyrene foam(EPS),polyurethane(PU)foam.However,the poor flame retardant performance of polystyrene and polyurethane caused a lot of potential safety problems.Phenolic urea formaldehyde foam has many functions such as excellent thermal insulation,good flame retardant,huge potential for development.Although there are many types of phenolic foam plate on the market,but most of the phenolic foam board has high brittleness,easy slag off,the production cost higher shortcomings.In this paper,phenolic foam was studied to overcome the problem,and put forward the research of low cost and high flame retardant phenolic urea formaldehyde resin and its foam.Based on the synthesis of phenolic resin,phenolic urea formaldehyde resin was synthesis by replacing parts of the phenol with urea.The reaction of urea and formaldehyde with flexible urea-formaldehyde resin,which enhance the phenolic urea formaldehyde bubble drawing strength,compression strength,reduces the coefficient of thermal conductivity of phenolic urea formaldehyde foam.We tested the mechanical properties and thermal conductivity of phenolic urea formaldehyde foam with instron-5569 type electronic universal testing machine and BYF-2 type thermal conductivity tester.The result shows that compared with phenolic foam phenolic urea formaldehyde foam drawing strength increased by 17.7%,impact strength increased 42.7,compression strength increased by 18.8%,the thermal conductivity was reduced by 8.7%.The addition of urea reduced the addition amount of phenol and the cost.Replacing part of formaldehyde solution with solid formaldehyde(37%)synthesis phenolic urea formaldehyde resin which has certain moisture content and viscosity.With paraformaldehyde addition amount accounted for 90% of the total content of formaldehyde,no dehydration synthesis of phenolic urea formaldehyde resin viscosity of 4200 m Pa s.,solid content is 81%,for the preparation of phenolic urea formaldehyde foam phenolic urea formaldehyde resin.The resin did not have too much water and don't have to vacuum distillation in addition to water,which achieve zero effluent discharge and implements the green synthetic phenolic urea formaldehyde resin.Phenolic urea formaldehyde resin was synthesized with phenol,urea,formaldehyde and molybdenum disulfide in the method of situ polymerization.Phenolic urea formaldehyde resin was used to prepare phenolic urea formaldehyde foam.We tested the mechanical properties and thermal conductivity of phenolic urea formaldehyde foam with instron-5569 type electronic universal testing machine and BYF-2 type thermal conductivity tester.When the addition of molybdenum disulfide quantity of phenol is 3%,compared with the phenolic urea formaldehyde foam without mos2 the drawing strength increased by 16.6%,impact strength increased by 21.2%,coefficient of thermal conductivity was reduced by 10.1%,oxygen index increased by 5.6%.Compared with the phenolic foam drawing strength increased by 38.5%,impact strength increased by 68.9%,coefficient of thermal conductivity was reduced by 18%,oxygen index increased by 21%.On the basis of molybdenum disulfide modified phenolic urea formaldehyde foam,with coupling agent KH550 functionalization of molybdenum disulfide and phenol,urea,formaldehyde in-situ polymerization preparation phenolic urea formaldehyde resin.Test the performance of the phenolic urea formaldehyde resin foam.Functionalization of phenol is 2%amount of molybdenum disulfide to join in the preparation of phenolic urea formaldehyde foam properties are as follows: drawing intensity is larger than the standard 100 k Pa to 167 k Pa,coefficient of thermal conductivity is 0.0281 W/m,K lower than the standard 0.032 W/m,K,oxygen index was 47% higher than the standard 38%.From the SEM photo of phenol urea-formaldehyde foam we can draw the conclusion that small hole in the functionalization of molybdenum disulfide modified phenolic urea formaldehyde foam bubble hole wall is reduced.And the bubble hole wall thickness increased,which enhance the mechanical strength of the phenolic urea formaldehyde foam.Curing agent contains phosphoric acid,p-toluene sulfonic acid,phenol sulfonic acid,glycerin,water.11 is the best curing agent,which proportion is 20%,and 30% p-toluene sulfonic acid,phenol sulfonic acid phosphate 25%,glycerol 5%,water 20%.The curing agent of the preparation of phenolic urea formaldehyde foam performance compared with industrial preparation of curing agent have greatly improved,11 preparation of phenolic curing agent of urea formaldehyde foam compression strength of 0.43 MPa is greater than the industrial preparation of phenolic curing agent of urea formaldehyde foam compression strength 0.389 MPa.11 curing agent preparation of phenolic urea formaldehyde foam acid reduced,p H of 5.Glycerol as a corrosion inhibitor can reduce the phenolic acid of urea formaldehyde foam effectively.