Study on the Use of Rare Earth Stabilizer as Poly(Vinyl Chloride) Stabilizer

Abstract

Lanthanum aminobenzoate (LAB), cerium aminobenzoate (CAB), and lanthanum and cerium aminobenzoate (LCAB) were synthesized with p‐aminobenzoic acid, lanthanum nitrate, or cerium nitrate as raw materials to study the influence of different rare earth elements on the stability of rare earth stabilizers. The thermal stability of by CAB, LCAB, and LAB toward poly(vinyl chloride) (PVC) was studied. The results of Congo red test and thermal aging test showed when three rare earth stabilizers acted independently, the advantages and disadvantages of thermal stability are as follows: LAB > CAB > LCAB. However, in compound experiments, the thermal stability of composite stabilizers compounded by CAB or LCAB with zinc stearate, calcium stearate, or pentaerythritol (PE) was slightly better than that of composite stabilizers compounded by LAB. Among of them, when the compounding scheme was LCAB:zinc stearate:PE = 1:1:3, the thermal stability time reached 60 minutes; CAB:zinc stearate:PE = 1:1:3, the thermal stability time reached 50 minutes, compared with the rare earth stabilizer alone, the composite thermal stabilizer gave PVC samples better antidiscoloration performance and longer thermal stability time.

A zinc Schiff base complex as high‐efficiency stabilizer for flexible poly(vinyl chloride) against thermal degradation

“…Moreover, Zn‐HBAPA can also neutralize HCl and combine with labile chlorine atoms in PVC building units, which is similar to ZnSt 2 . [ 24‐25 ] Thus, the working mechanism of Zn‐HBAPA we suggested is outlined by Figure 12.…”

“…[23] Some rare-earth stabilizers had been investigated. Liu et al [24] used the lanthanum and cerium rare-earth stabilizers for PVC. They found that the lanthanum and cerium rare-earth stabilizers had a poor stability effect on the PVC when used alone but showed a good synergistic effect with traditional stabilizers.…”

Synergistic Effects of Mixed Metal Stearate, Calcium Carbonate Particles and Recycled Low Density Polyethylene on The Mechanical, Thermal and Structural Performance of Polyvinylchloride Blend.

“…4b thermal stability increased with increasing heat stabilizer concentrations and delayed the discoloration of PVC samples with a signi cantly resistance to discoloration of PVC/r-LDPE samples MC10 and MC12 which the incorporation of r-LDPE into PVC showed much better antidiscoloration compared with PVC microcomposites. In addition, the samples rich in Zinc stearate MC1, MC3, MC5, MC7, MC9, and MC11 quickly turned to dark color, the reason is that ZnSt 2 can remove initial coloration by substituting labile chlorine atoms from the PVC chain [42]. However, the heat stabilizer rich in calcium stearate increases the PVC stabilization time due to the inhibition of ZnCl 2 which is responsible of dehydrochlorination process [43].…”

Preparation and Properties of Modified Phenylethynyl Terminated Polyimide with Neodymium Oxide

“…A series of research articles in this field have illustrated that rare earth oxides have a positive effect on the thermal-oxidative stability of polymers such as polyethylene, polyaniline, and thermoplastic PIs. The key sources of the contributing factors of these rare earth oxides involve their distinctive morphologies and catalytic properties [30][31][32][33][34][35][36]. Considering the special atomic structural characteristics of rare earth elements, blending PIs with rare earth oxides is a promising method for developing new organic-inorganic hybrid materials as they may combine the properties of inorganics such as heat resistance with the inherent characteristics of PIs.…”