Zinc-based heat stabilizer for polyvinyl chloride, composition with same and application of zinc-based heat stabilizer for polyvinyl chloride

Abstract

The invention relates to zinc-based heat stabilizer for polyvinyl chloride, a composition with the same and an application of the zinc-based heat stabilizer for polyvinyl chloride. The zinc-based heat stabilizer is prepared from urea organic matter and zinc salt through a liquid phase reaction. According to the composition independently prepared from the zinc-based heat stabilizer or prepared by mixing the zinc-based heat stabilizer, calcium carboxylate, beta-diketone, phosphite ester and polyhydric alcohols raw materials, the thermal stability of PVC can be effectively improved. The raw materials of the zinc-based heat stabilizer are easy to obtain, the synthetic process is simple, industrial application prospects are achieved, and the zinc-based heat stabilizer has the important guiding function on research and development of novel urea heat stabilizer.

Description

technical field [0001] The invention belongs to the technical field of PVC (polyvinyl chloride) heat stabilizers, and in particular relates to a zinc-based heat stabilizer and a composition. Background technique [0002] PVC is one of the polymers with the earliest industrial production time and the widest application field in the world, and is widely used in various fields of industry and agriculture. However, PVC resin is also one of the polymers with the worst thermal stability and the most prone to degradation. It begins to thermally degrade at 120°C, releasing toxic gases (mainly hydrogen chloride), and the color of the product turns red until completely black. The mechanical properties deteriorate and eventually lose the use value, so this defect greatly limits the application field of PVC. In order to effectively avoid the degradation phenomenon of PVC in the process of processing and application, the more common practice in industrial production is to add PVC during ...

AI Technical Summary

Problems solved by technology

However, although the traditional zinc-based heat stabilizers can effectively inhibit the initial degradation and coloring, the conversion product ZnCl 2 It is also a catalyst for PVC to remove HCl, which will cause malignant degradation of PVC samples and make the material suddenly black, that is, "zinc burning". Therefore, the long-term thermal stability of traditional zinc-based heat stabilizers is relatively poor. Composite use of calcium-based heat stabilizers with good long-term thermal stability

[0004] Mohamed et al. studied the heat stabilization effect of a series of phenylurea and phenylthiourea derivatives as PVC heat stabilizers (SabaaMW, MohamedRR, YassinAA. Organicthermalstabilizersforrigidpoly(vinylchloride) VIII.Phenylureaandphenylthioureaderivatives[J]. 1): 37-45. SabaaMW, MohamedRR, YassinAA. Organicthermalstabilizersforrigidpoly(vinylchloride) IX. YassinAA.Organicthermalstabilizersforrigidpoly(vinylchloride).PartX:N-acryloyl-N'-p-substitutedphenylthioureaderivatives[J].Polymerdegradationandstability,2003,82(3):387-393.), the results show that when used alone for PVC thermal processing, Phenylurea and phenylthiourea derivatives can prolong the induction time of PVC thermal degradation, but the effects in slowing down the HCl removal rate of PVC and inhibiting the degradation and coloring of PVC are not ideal. If phenylurea and phenylthiourea derivatives are combined with hard The combined use of zinc fatty acid can not only increase the induction time of PVC thermal degradation to a certain extent, but also reduce the rate of HCl removal

Images