Incompatible hazard investigation of a cycloaliphatic epoxy resin using green analytical method

Abstract

A green analytical method was applied to evaluate the incompatible hazard for 3,4-epoxycyclohexane methyl-3 0 4 0 -epoxycyclohexyl-carboxylate (EEC) mixed with its synthetic materials. During the manufacturing process, numerous accidents of human poisoning, explosion, or fire have been reported due to the chemical's incompatible reaction. A calorimetric application and product's analysis approach have been employed to obtain related information for the incompatible hazard investigations of chemicals. This study also used nonlinear regression analysis to establish a kinetic model. The results proved that H 2 SO 4 can cause an abnormal curing reaction and release significant amounts of heat of the curing reaction for EEC, increasing the occurrence probability of accidents.Keywords Calorimetric application Á Curing reaction Á 3,4-Epoxycyclohexane methyl-3 0 4 0 -epoxycyclohexylcarboxylate (EEC) Á Kinetic model Á Product's analysis approach List of symbols APre-exponential factor (m 3 mol -1 s -1 ) E a Apparent activation energy (kJ mol -1 ) k 0 Frequency factor (m 3 mol -1 s -1 ) n i Reaction order of the stage, dimensionless,Autocatalytic constant, dimensionless da/dt Conversion rate (s -1 ) DH c Heat of curing reaction (kJ kg -1 )Greek letters a Degree of conversion, dimensionless b Scanning rate (°C min -1 )

Effects of UV for Cycloaliphatic Epoxy Resin via Thermokinetic Models, Novel Calorimetric Technology, and Thermogravimetric Analysis

“…We selected DSC 30 to investigate the heat production of EEC and EEC under prominent UV for one and two months. Figure 4 shows the experimental results of EEC and EEC irradiated with UV for one and two months.…”

Evaluation on the Photosensitivity of 2,2′-Azobis(2,4-Dimethyl)Valeronitrile with UV

“…When azo is involved in an exothermic reaction, it can amply provide free radicals and energy for synthesis of organic compounds or polymers, such as styrene, methyl acrylate, epoxy resin, or propylene, as an initiator, cross-linking, or curing agent. However, ADVN has thermal instability and sensitivity because of its –N=N– structure, which may incur violent thermal decomposition by external fire, other igniting sources, or irradiation [4,5,6,7,8]. In the past, many thermal accidents have occurred because the inherent safety of chemicals is not explicit and the accident process is unexpected, which may result in the stored temperature, cooling system, or pressure relief system to be wrongly designed for safety considerations.…”

Prediction of thermal hazard for TBPTMH mixed with BPO through DSC and isoconversional kinetics analysis

“…They have a wide range of applications in the plastic and rubber industries and are often used as initiators and cross-linking agents in polymerization reactions [1,2]. Methyl ethyl ketone peroxide (MEKPO), tert-butyl peroxide (BPO), cumene hydroperoxide (CHP), hydrogen peroxide (H 2 O 2 ), tert-butyl peroxybenzoate (TBPB), and lauroyl peroxide are typical OPs that are widely used in industrial processes [3][4][5][6]. However, because the R-O-O-R structure is essentially thermally unstable, highly sensitive, and tends to form the RO Á radical easily [7,8], OPs possess numerous hazardous characteristics, such as thermal sensitivity, enormous amount of heat evolution upon decomposition, and explosion (Table 1) as well as their likelihood to have contaminants, inorganic acids, such as H 2 SO 4 , HNO 3 , and H 3 PO 4 [9,10].…”