Fireproof, solid state epoxy resins

Abstract

Solid state epoxy resins were synthesized in the reactions of the systems: 1,1-dichloro--2,2-bis(4-hydroxyphenyl)ethylene (BPC II) and 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), mixed in various weight ratios, with one of two low-molecular weight epoxy resins, Epidian 5 ® or diglycidylether of 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene (DGEBC II). Additionally the series of the samples synthesized with use of DGEBC II but with addition of red phosphorus as flame retardant were prepared. It was found, on the basis of limiting oxygen index (LOI) measurements, that the flammability of the samples decrease (higher values of LOI) with increase in BPC II weight part in the mixture with bisphenol A, for all the series of samples prepared. Solid state resins synthesized with the use of DGEBC II were less flammable than similar samples with bisphenol A. Addition of red phosphorus increased significantly LOI values, however, caused deterioration of optical properties of the resins investigated. The samples characterized with low flammability were selected for the syntheses with addition of zinc stannate (ZS) or zinc hydroxystannate (ZHS) as flame retardants. The values of LOI of the products obtained were determined (Table 2). It was found that the addition of 2-3 wt. % of ZS or ZHS significantly improves LOI values not causing the deterioration of optical properties.

Development and Characterization of Novel Fore Safe Epoxy Resins

“…In the next step epoxies and curing agents were warmed to temperatures 393, 418 and 443 K and mixed together by mechanical mixer with the rotations 2000 rpm in different quantities according to Table 1. The evidence of these solid state epoxies by FTIR and NMR were published in the previous papers [11,12].…”

“…Two commercial BPA epoxies ARALDITE -GY 250 from Huntsman CompanyAustria, Epidian 5 ® from Sarzyna Company (Poland), and one was prepared in our lab: DGEBPC (diglycidylether of bisphenol C). Diglycydyl ether of bisphenol C was prepared according to the description [2,12]. ZS (zinc stannate) and ZHS (zinc hydroxystannate) were commercial products of Joseph Storey Co (UK).…”

“…Previous works [11,12] have consisted in the synthesis of a few different epoxy resins based on low molecular weight commercial epoxy resins such as Epidian 5 (Sarzyna Poland) and diglycidylether of bisphenol-C (DGEBPC) resulting in high molecular-weight solidstate epoxies (the epoxy value stays low around 0.03-0.09; Mw = 1700-2300).…”

A study on thermal stability of glycidylsiloxane resins cured with aliphatic amines

“…Silicone resins may be applied for the modification of non-aqueous acrylic dispersions [30,31]. The thermal resistance of polyurethane coatings may be increased by the addition of epoxy resins containing glycidoxypropyltrimethoxysilane and polyamines [32,33]. The adition of 5 to 10 wt % of polyorganosiloxane to film-forming resins results in an improvement in the thermal and atmospheric stability, as well as conferring water resistance properties [6,7,[34][35][36].…”

Novel halogen-free flame retardants - flame retardation of unsaturated polyester resins with use of boron compounds

“…Wynikaj¹ce z tego rozwi¹zanie zmniejszania palnooeci stanowi wykorzystanie bezhalogenowych, efektywnych dodatków FR, których wprowadzenie, w stosunkowo niewielkiej ilooeci pozwoli³oby na osi¹gniêcie po¿¹danego poziomu uniepalnienia produktów koñcowych [3]. Ten kierunek modyfikacji ¿ywic konstrukcyjnych z powodzeniem realizuje siê za pomoc¹ zwi¹zków fosforu, przede wszystkim fosforanów tris(2-chloroetylu), tris(2,3-dibromo-propylo) trikrezolu, tris(1-chloro-2-propylu) b¹dŸ (2,3-diokso-1-oksa-2-dimetylowego) [4,5].…”