PVC heat stabilizer in the study on lanthanum hydroxide

Polyvinyl chloride (PVC) is one of five general-purpose plastics, its products have a wide range of uses. However, PVC shortcomings of poor thermal stability exists, the processing must be fluorescent brightener  added when a suitable thermal stabilizer to inhibit thermal degradation. Commonly used industrial thermal stabilizers are inorganic lead salts and organic tin metal soap. However, most of the commonly used species are toxic, which not only limits the scope of application and PVC products, the use of the environment and the health hazards of labor with PVC products are produced by growing rapidly deepened. To protect the environment and improve the potassium stearate  health conditions of labor, have been successively developed and implemented restrictions on the use of toxic and hazardous chemicals policies and regulations. Therefore, research and development at home and abroad are set off and promote the use of non-toxic material heat stabilizers to replace conventional toxic species of the boom. Rare is the advantage of our resources, rare earth compounds as heat stabilizers for PVC applications has  methyl tin stabilizer aroused extensive attention. In principle, since a weak alkaline earth hydroxide, can neutralize and absorb HCl, and hence, a heat stabilizing effect on PVC. But until now, although the literature involving alkaline earth metal hydroxide is calcium hydroxide as a special heat stabilizers for PVC applications, but no rare earth hydroxide is used as PVC heat stabilizers reported. Recently, the experts for the development of cost-effective environmentally friendly zinc-based PVC heat stabilizers, inorganic compounds as a heat stabilizer application performance for a more systematic study found that lanthanum hydroxide is effective synergist heat stabilizers