The Preparation And Properties Of New Molybdic Compound

The application of polymer benefits mankind greatly. At the same time, many potential safety problems are brought about. The inflammable and smoking problem of polymer have become important factors that can influence development of economy and steady of society. So, resolving the burning and smoking problem of the polymer, developing new efficiency retardants and smoking suppression, have become research contents of advanced materials. It has realistic and theoretical meaning.The ammonium molybdate and molybdic oxide are common excellent smoking suppression. As Lewis acid, the molybdic compound can accelerates PVC coming off HCl to form reversed olefin in condense state. It realizes the goal of smoke suppressing by promoting the formation of non-aromatics rings,increasing charcoal amount,boosting oxygen index number,decreasing the flammability component and reducing the smoking velocity and density. The rarity of the molybdic compound brings on the valuableness. As the smoking suppression, there is great disparity among our country and the developed country because of the unadvanced preparing technology. The molybdic compound is used to be an element of blending of smoking suppression in our country, The domestic method bring about the decline of effectiveness, the waste of resource and the defect of mechanic properties.In order to resolve the above-mentioned issues, one task of this research is to prepare the excellent complex retardant and smoking suppression of molybdic compound by means of composite.The second is to prepare new excellentmolybdic compound with molybdenum and other elements by means of molecule design. The third is to prepare the excellent complex retardant and smoking suppression with molybdenum and more any other elements by means of molecule design and composite. These works are new methods of researching excellent retardant and smoking suppression because the performances of the molybdic compound have been improved greatly.In this paper, the mechanisms of burning, fireproof and smoke suppressing have been discussed detailedly.So the approach and developmental direction of the retardant and smoking suppression have been pointed out clearly. In the research, the complex smoking suppression of ammonium molybdate and molybdic oxide have been prepared successfully with zeolite as the carrier. The properties of the complex smoking suppression have been studied completely . The results of 01 and smoking density indicate that the effect of the smoking suppressing is remarkable. In the cone calorimetry test, The result of SR indicate that the efficiency of smoking suppression is over 50%. The result of RHR indicate that the complex smoking suppression is of well effect in fireproofing, The result of mechanics capability test indicates that the complex smoking suppression have good compatibility with polymer. The reason of outstanding properties is that the molybdic compound has been dispersed completely in the carrier, which makes the complex smoking suppression touch with the polymer sufficiently and improves reactivity of molybdic compound. So, it can make the most use of the molybdic compound on smoking suppressing. At the same time, the complex smoking suppression has better properties result from the coordinated effect of the carrier. Preparing complex smoking suppression with zeolite as the carrier is a new way of modifying the molybdic compound. This new technique is not only of theoreticsignificance but economic and social significance.By means of the molecule design, We have prepared a few new compounds such as calcium phosphomolybdate with molybdenum, phosphorus and any other elments for the first time. These new phosphomolybdate salt have been characterized by XRD> IR> DSC and TG. Their kinetic equations have beencalculated exactly. These works have laid foundation of the application. In the research, the properties of fireproofing and smoke suppressing have been studied completely. The reason of well properties is that the phosphomolybdate salt possess several elements of fireproofing and smoke suppressing, which can turn into phosphoric acid, water and molybdic compound in high temperature. Furthermore, The result of mechanics capability test indicates that the phosphomolybdate salt has good compatibility with polymer. The study indicates that the phosphomolybdate salt are new kind of flame retardant and smoking suppression because of the well properties of fireproofing and smoke suppressing, the low price and the good compatibility with polymer. In conclusion, the means of molecule design is important theoretic guidance and basic for researching new flame retardant and smoking suppression ?On the base of ammonium phosphomolybdate, phospho-ammonium phosphomolybdate and antimony pentoxide-ammonium phosphomolybdate have been prepared with phosphorus and antimony pentoxide respectively by means of molecule design and composite. The characters given by XRD and IR have laid foundation of their application. The results of 01 ,smoking density and CONE indicate that both phospho-ammonium phosphomolybdate and antimony pentoxide-ammonium phosphomolybdate have better properties of fireproofing and smoke suppressing and good compatibility with polymer. So that, both phospho-ammonium phosphomolybdate and antimony pentoxide-ammonium phosphomolybdate are new kind of retardant and smoking suppression. The combination of molecule design and complex can create new excellent complex with different useful elements. This method is of theoretic and practical significance of studying advanced materials, especially advanced retardant and smoking suppression.In the process of researching advanced retardant and smoking suppression, the application of molecule design and composite can improve the properties and broaden the applied scope. There is an importance of establishing scientific developmental conception, protecting people's lives, promoting social stability.