Application of Zinc Oxide to Obtain and Modify Properties of Adipate Plasticizer of Polyvinyl Chloride.

Aliya K Mazitova,Irina N Vikhareva,Guliya K Aminova,Juliya N Savicheva

doi:10.3390/polym12081728

Aliya K Mazitova, Irina N Vikhareva + Show 2 more

Open Access

https://doi.org/10.3390/polym12081728

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Journal: Polymers	Publication Date: Aug 1, 2020
Citations: 10	License type: CC BY 4.0

Affiliation: Ufa State Petroleum Technological University

Abstract

Heterogeneous catalysts are widely used in basic research and in the petrochemical industry due to their effectiveness. In modern times, interest in this type of catalyst and, in particular, in mineral oxides is associated with the technological design of the process, namely: The absence of waste emissions, and the possibility of regeneration and reuse of the catalyst, which meets the criteria of green chemistry. For this reason, the preparation of non-toxic adipate plasticizers is expediently carried out under conditions of heterogeneous catalysis. Zinc oxide was chosen for this purpose, and as initial reagents: Adipic acid, butoxyethanol, and phenoxyethanol. For synthesized butoxyethylphenoxyethyl adipate by thermogravimetry on a TGA-DSC-combined thermal analysis instrument and differential scanning calorimetry on a DSC-1 instrument («Mettler Toledo»), the following properties were studied: Thermal stability, melting and crystallization temperatures, polymer compatibility. An analysis of the data in comparison with di-2-ethylhexylphthalate confirmed the possibility of using it as a plasticizing additive in PVC compositions. The zinc compound obtained in situ as part of the developed plasticizing composition contributes to increasing the color and thermal stability of the obtained PVC compositions.

Highlights

Polyvinyl chloride (PVC) is one of the most common plastics used today due to its low cost, durability, versatility, and the possibility of modifying properties using various additives [1,2].Among the most important additives are plasticizers, which account for up to 60% of the plastic compound [3,4,5].The leading positions in the volume of applications are taken by ester plasticizers, including compounds based on adipic acid [6,7,8]
As a result of the above comments, the goal of this work is the synthesis of a new ester plasticizer of polyvinyl chloride based on adipic acid ester using an environmentally friendly zinc oxide catalyst and the development of a plasticizing composition containing a stabilizing additive obtained from zinc oxide in situ
It was revealed that the ester developed is limited to the compatibility with the PVC polymer in plasticate, so studies were carried out in a mixture with DOF in the ratio of DOF:Butoxyethyl Phenoxyethyl Adipate (BEPEA) = 5:1

Summary

Introduction

The leading positions in the volume of applications are taken by ester plasticizers, including compounds based on adipic acid [6,7,8]. This type of plasticizer is characterized by low toxicity, biodegradability, and complies with the strict environmental and safety rules formulated in the Rio. Declaration on environment and development [9,10,11,12,13]. The main way to obtain adipic acid esters is esterification [14,15]. The catalysis of this process is carried out using homogeneous catalysts, for example, mineral acids (H2 SO4 , HF, H3 PO4 ), organic sulfonic acids (paratoluene sulfonic acid, benzenesulfonic acid), or using heterogeneous catalysts (metal oxides and hydroxides, salts, zeolites, clays)

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