High Performance At Room Temperature Cured Phenolic Binder Preparation And Its Performance Study

This article deals with the study on alkylphenol modified water-soluble Resole phenolic resin synthesized by phenol and formaldehyde in the presence of aqueous NaOH, and the manufacture of a high-performance no-bake phenolic binder using the organic ester and light-burned magnesia as the curing agent.The effect of synthetic reaction conditions, such as reaction time, reaction temperature and the catalyst, etc. on the performance of resin such as gelation time, viscosity, solid content, water-misciblity, the content of free phenol and free formaldehyde was studied. The influences of environment temperature, free formaldehyde and the polarity of solvent on resin storage life were also investigated. The experimental results showed that the viscosity and the content of resin solid content increased, the water-misciblity of resin decreased with reaction temperature rising. The gelation time became shorter and the content of the free phenol and formaldehyde gradually decreased according to the increased adding amount of catalyst. With the increase of reaction time, the gelation time gradually decreased, and the water-misciblity reduced while the viscosity and the content of solid content increased. The storage life was influced by the different content of free formaldehyde, solvent polarity and the environment temperature.The curing reaction activation energy of modified phenolic resin calculated by Arrhenius equation was 65.57kJ/mol.The no-bake phenolic binder was prepared by the modified phenolic resin. The curing mechanism of organic ester-cured phenolic resin was investigated. The results showed that the curing reaction of ECP accelerated as the amount of y-butyrolactone and light-burned magnesium oxide increased. The flame-retardant property of the no-bake phenolic binder was measured by PH-PDF60 oxygen index tester. The limiting oxygen index became small along with the increased adding amount ofΥ-butyrolactone, but the flame-retardant property was better as the amount of Al(OH)3 increased.