Thermo-oxidative aging resistant PVC tubular product and preparation method thereof

Abstract

The invention discloses a thermo-oxidative aging resistant PVC tubular product and a preparation method thereof. Modified nano barium sulfate is taken as an ageing resistant agent, the nano barium sulfate is firstly modified through sodium stearate, and the sodium stearate is wrapped on the surface of the nano barium sulfate, so that the dispersibility of the nano barium sulfate in a base body is improved, simultaneously the compatibility of the nano barium sulfate and the PVC base body is also improved, and the degree of crystallinity of the PVC improved; therefore, the material of the base body is denser, the oxygen diffusion rate is reduced, and the thermal oxidation stability of the material is improved; then, a rear earth coupling agent is used for graft modification, the rear earth coupling agent can play a coupling role, a relatively firm wrapping layer can be formed on the surface of the nano barium sulfate due to a unique outer electron layer structure of rear earth elements, inorganic rigid particles using rare earth complexes as shells and the nano barium sulfate as cores are formed, and the inorganic rigid particles are of a relatively high toughening modification effect on the PVC tubular product.

Description

Technical field [0001] The invention relates to the field of PVC pipe production, in particular to a heat-resistant oxygen aging PVC pipe and a preparation method. Background technique [0002] PVC pipes are visible in daily life. Because of their abundant raw materials, low price, strong corrosion resistance, high strength, good rigidity, excellent processing performance, and strong electrical insulation, they are widely used in water supply and construction drainage. , Sewage, chemical and other technical fields. [0003] However, PVC pipes, like other polymer materials, have aging. There are two main reasons for the aging of polymers: on the one hand, internal factors, that is, the structural properties of the polymer itself, such as unsaturated double bonds, branched chains, hydrogen peroxide groups, etc.; on the other hand, external factors, that is, the external environment Factors, mainly light, heat, oxygen, etc. The complex process of interaction between internal and ex...

AI Technical Summary

Problems solved by technology

The complex process of interaction and alternating influence of internal and external factors changes the molecular structure of the polymer material, reduces the relative molecular weight or produces cross-linking, which reduces the performance of the material or even leads to damage, so that it cannot be used.

For PVC materials used in fisheries, the aging problem is particularly serious