2 results about "Diaminotoluene" patented technology

This invention provides an enhanced chlorine-resistant reverse osmosis membrane, comprising a base layer, a polyamide layer, and a polymeric protective layer. The polyamide layer is disposed on the base layer, and the polymeric protective layer is disposed on the polyamide layer. The polyamide layer is formed by interfacial polymerization of a diamine aqueous phase and a polyacrylamide oil phase. The solute in the diamine aqueous phase includes common amines and specific diamines, and the specific diamine includes at least one selected from 2-methyl-p-phenylenediamine, 4-methyl-1,3-phenylenediamine, 2,6-diaminotoluene, and 2,4,6-trimethyl-1,3-phenylenediamine. The polymeric protective layer is connected to the surface of the polyamide layer through polyaldehyde molecules. This invention, through the combination of the base layer, the polyamide layer, and the polymeric protective layer, enables the enhanced chlorine-resistant reverse osmosis membrane to achieve both a high desalination rate and excellent chlorine resistance.

This invention discloses an anti-yellowing LC-grade dimethylthiotoluene diamine, its preparation method, and its applications, relating to the field of dimethylthiotoluene diamine chemical raw material technology. The method includes dimethylthiolation of diaminotoluene to obtain a crude product; partial acylation with trimesoyl chloride to introduce a steric barrier; and compounding with TEMPOL, antioxidants 1010 and 168 to construct a three-level synergistic antioxidant network, yielding an anti-yellowing intermediate; then introducing nano-boron nitride and octaphenyl cage-type silsesquioxane to construct an organic-inorganic hybrid heat-resistant network, obtaining an anti-yellowing and heat-resistant product; finally, using γ-cyclodextrin to encapsulate TEMPOL and phytic acid to chelate metal ions, achieving long-term antioxidant stability. The resulting product exhibits excellent anti-yellowing properties, heat resistance, and long-term stability during high-temperature service.