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Study on Penzinc as Thermal Stabilizer for PVC

Author: XuShiLu
Tutor: YuXianJin；LiDeGang
School: Shandong University of Technology
Course: Applied Chemistry
Keywords: Zinc three salt PVC heat stabilizers Synthesis Congo red dipstick
CLC: TQ325.3
Type: Master's thesis
Year: 2011
Downloads: 59
Quote: 0
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Abstract


With the rapid development of the PVC industry, as well as people gradually raise environmental awareness, and the development of heat stabilizers for PVC efficient drug has become a necessity. Calcium zinc heat stabilizers as an alternative to lead salts, in recent years more and more cause for concern. Calcium zinc heat stabilizer prominent drawback is the poor thermal stability, and the effect of the traditional use of lead salts are incomparable. Therefore the development of efficient calcium zinc heat stabilizers become an inevitable development trend of PVC heat stabilizer industry. This paper using zinc oxide as well as the traditional use of the auxiliary stabilizer pentaerythritol as raw material, is conducted by heating the solid-phase reaction, synthesis of a new heat stabilizer zinc triple salt. Its SEM, FTIR, XRD and DTA characterization. The Zinc three salt single or after mixed with the other heat stabilizers are added to PVC, Congo red dipstick, oven aging test and the dynamic torque rheometer and thermal re-test the effect of the thermal stability, the main results of the study are as follows : 1, using the solid phase synthesis method of zinc three salt. The two reactants are added proportionally to the sufficiently stirred in the reaction vessel placed in an oven heated to solid phase reaction. The experimental determination, the optimum conditions of, the pentaerythritol with activated zinc oxide, the mass ratio of 7:3, and the reaction time at 200 ℃ for 2 hours. 2, by means of a variety of instruments characterized by three zinc salt. XRD measurement showed that the comparison with the reactants, zinc three salt polymorphs change significantly; IR spectrum confirmed zinc exist in the newly generated three salt Zn-O coordination bond; SEM results showed that the zinc salt having a three layered structure a product of particle size of about 3.5 microns; zinc three salts and two of the pre-reaction mixture by TGA experiments reveals apparent weightlessness process, especially the first process, namely the zinc salt formation. 3, the static tests showed that the heat stabilizing effect of zinc three salt of PVC has been considerable, and in the traditional lead salt effects better than the commercially available calcium zinc heat stabilizer. Three of different proportions of zinc salt as a single thermal stabilizer, and added to 4 parts of different thermal stabilizers thermal stabilization time, the results show that adding a single zinc three salt 5.8 parts by Congo red dipstick test, the thermal stability The time is the best. By static oven aging test found zinc triple salt PVC early and long-term hue have good stabilizing effect, the initial holding white effect, lead salt-based long-term discoloration better than no zinc burning phenomenon. Early and long-term suppression of PVC sheet with a 3:1 complex with pentaerythritol ester or proportionate dione discoloration effect. 4, the dynamic torque rheometer test showed that the zinc three salt dione and pentaerythritol esters After compounding proportion used as heat stabilizers for PVC, dynamic process torque appropriate extrudate whiteness, surface morphology is smooth , molding better, larger industrial prospects.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > PVC and plastic
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