Study On Synthesis And Properties Of Waterborne Fluorinated And Silicified Fireproof Polyurethane

In order to meet the needs of waterborne polyurethane (WPU) with new type offunction in the living and production, it is the main research focus to improve waterresistance and stability of WPU, to improve the comprehensive performance of WPU,to expand the application scope of WPU, to exploit WPU with special physical andchemical properties, et al. WPU modified by organic fluorine and silicone wasprepared using organic fluorine and silicone monomer, which verified the universalityabout modifying WPU using organic fluorine and silicone in this paper. Furthermore,the affection of the organic fluorine and organic silicon monomer on the structure andproperties of WPU was intensively studied. At last, flame retardant was introduced intowater-borne polyurethane, which would expand its application in flame retardantmaterials.Firstly, the WPU modified by siloxane with self-crosslinking property wassynthesized via the hydroxyethyl sealing side polydimethylsiloxane (SHG). Moreover,a series of siloxane-modified WPU (WPU-Si) were prepared by changing the amountof SHG. With the increase of SHG, the laser particle analyzer analysis showed that theparticle size of the WPU-Si increased gradually; the water resistance analysis resultsshowed that water absorption rate of the WPU-Si film was almost plummeting. Whenthe content of SHG increased from0%to6%, the tensile properties of WPU-Si filmincreased from11.8MPa to22.0MPa, the break elongation decreased from286%to78%; the water absorption decreased from8.4%to3.6%. The TGA results indicatedthat the thermal stability of WPU-Si film was significantly the incorporation of SHG.A series of organic fluorine waterborne polyurethane (WPU-F) was synthesizedusing different content of1H,1H,8H,8H-12fluorine-1,8-diol (F12). When the F12content was merely2%, WPU-F showed superior performance. And, the water analysisresults showed that the water contact angle increased from49.5°to72°; the water absorption decreased from8.5%to5.8%; the pencil hardness increased to HB ratingfrom2H rating; and the stretch strength increased to18.64Mpa from11.54Mpa. Inaddition, WPU-F also showed excellent stain resistance performance and fine thermalstability.Organic fluorine silicon waterborne polyurethane（WPU-F-Si）was synthesized bySHG and F12. Compared with organic silicon waterborne polyurethane（WPU-Si）andorganic fluorine waterborne polyurethane (WPU-F), WPU-F-Si shows betterperformance than WPU-Si and WPU-F. The contact angle and water absorption ofWPU-F-Si was91oand3.3%, respectively; the contact angle and water absorption ofWPU-Si was90oand3.7%, respectively; and the contact angle and water absorption ofWPU-F was59.5oand7.5%, respectively. The stretch strength of WPU-F-Si was20.94MPa; and the stretch strength of WPU-Si and WPU-F is19.69MPa and14.57MParespectively. The flame retardant performance analysis showed that the heat releaserate of WPU-F-Si was340.4kW/m2, which declined39.7kW/m2and35.1kW/m2thanof WPU-Si and WPU-F, respectively. WPU-F-Si showed excellent thermal stabilityand flame retardant properties.Flame retardant waterborne polyurethane (WPU-APP) was synthesized based onammonium polyphosphate (APP). With the increase of APP, the ignition time ofwaterborne polyurethane increased gradually. The ignition time increased to45s from29s of pure WPU. The peak HRR decreased to314.3kW/m2from413.2kW/m2ofpure WPU. The more adding amount of APP, flame retardant waterborne polyurethanehad better flame retardant efficiency. The thermal stability of waterborne polyurethanefilm increased with the increasing of APP. The sample with25%APP shows the bestthermal stability among all samples.Water phase and mild reaction conditions afford the opportunity to install pendantfunctionality in order to elegantly design diverse materials with varied functionality. Itwill be a very attractive research platform that the biocompatible and antibacterialactive, biological active and degradable monomers are covalently linked with WPU viachemosynthesis reaction. Mild chemical reaction can overcome instability of thesemonomers at high temperature or in the water environment. The WPU modified bythese monomers can be used as the medical WPU, which will be a certain applicationprospect in biomedical field. This strategy may offer effective routes to prepare a family of related materials from one polymeric precursor by means of modularsynthetic approaches of the click chemistry. Moreover，adding fire retardant to thewater-borne polyurethane can overcome the drawback of waterborne polyurethaneflammable and promote the application of the polyurethane in the aspect of flameretardant materials.