Preparation And Application Of Montmorillonite-Polyurethane/Epoxy Composite

IPN is shortening of Interpenetrating Polymer Network.It means interpenetrating and vouble polymer intermixture. Its characteristic is one material runs through the other in order to force consistent charactera and cooperate with each other. As a result, the material behaves not only connatural character but also other unique character what the other commix can’t hold. It’s a rapid developing kind that can gain better modi-fied material.Lately, add nanoco-material to macromolecule complex material to enhance its capability. Nanoco complex material indicates one apperance disperses in the other by nanoco level(<100nm). Nanoco-material having bigger specific surface area results in a series of especial domino offect: little dimension and volume domino offect. It offers a better applying foreground for polyurethane. In this way, nanoco-montmorillonite gains more attention.In this paper, appending EP to PU comes into IPN to enhance thermal property and other mechanical behavior. In the same time, expatiate the mechanism of networks forming. And add nanoco-montmorillonite to polyurethane to strengthen the material. Further a new kind of material is composed by appending nanoco-montmorillonite to PU/EP IPN. Besides study the thermal property, wearable capability and other performances. The main contents and results are following:1. Polyurethane prepolymers with-NCO were prepared by reacting polyether N220with TDI. In the same time, epoxy was crosslinked to prepolymers. Curing agent(MOCA) was added to PU crosslinked epoxy. They were vigorously stirred and drafted for several minutes to eliminate all the bubbles produced during agitation. After removing the bubbles, the reaction mixture was poured into mold. And the sample was made.2. Test of mechanical properties displays the tensile strength of PU/EP IPN increased but elongation at break decreased while adding EP. When the ratio (N222:EP) reach to6:4, the material put up the property of cure EP partly. When the ratio came to7:3, the thermal property of net reached to the most,(onset and Te is the highest). In addition endure oil was the best at point. The thermal property dropped with a further increase of EP.Wearable capability tests show that when N220/EP is7:3, the wearable capability comes into the best. In this point, the ratio of N220to EP is optimal to the networks forming. The trend of wearable capability is increase then decrease.3. NDI replaced TDI and BDO instead of MOCA. Repeat the before the project. Founding, the sample had better thermal property than that made by NDI.4. Disperse nanoco montmorillonite in polyether and add TDI to make polyurethane prepolymers. MOCA is curing agent. They were vigorously stirred and drafted for several minutes to eliminate all the bubbles produced during agitation. After removing the bubbles, the reaction mixture was poured into mold. And the sample was made. As a result, PU modified by MMT had a greater capability than cure PU.5. Add nanoco montmorillonite to PU/EP complex material. The property of complex material had a future improvement.