نتایج جستجو برای: diisocyanate
تعداد نتایج: 1291 فیلتر نتایج به سال:
Abstract Soy flour can be substituted in polymeric diphenylmethane diisocyanate (pMDI) resin for bonding plywood. Resin bleed-through is avoided by prepressing at 95°C. The boards have greater wet and dry strength than do those prepared from melamine-urea-formaldehyde (MUF) resin. also emulsion polymer isocyanates cold-press applications. soy increases but keeps the unchanged. optimal level of ...
Toluene diisocyanate (TDI) is the most common cause of occupational asthma in western countries. The aim of this study was to investigate whether genetic factors are involved in toluene diisocyanate-induced asthma. We studied the frequency of human leucocyte antigen (HLA) class II genetic markers in three groups of subjects: 1) subjects with TDI-induced asthma (n = 30); 2) exposed subjects with...
An improved method was developed and validated for measuring low-level concentrations of toluene diisocyanates (TDls) in air. The method is based on OSHA Method 42 for industrial applications. Airborne TDls were trapped on a 25-mm glass-fiber filter impregnated with 50 pg of 1-(2pyridy1)piperazine. A filter holder for was constructed to minimize contamination and losses of the analytes. The der...
Background: In the foam industries, workers are exposed to various chemicals and working with these chemicals without considering occupational safety and health considerations could lead to different harmful symptoms. Consequently, in order to control measures and reducing risk to acceptable level, it is necessary to assess the health risk of exposure to harmful chemicals by implementation of s...
Isophorone is a technically important compound used as high-boiling-point solvent for coatings, adhesives, etc., and it starting material various valuable compounds, including isophorone diisocyanate, precursor polyurethanes. For over 80 years, has been synthesized via base-catalyzed self-condensation of acetone. This reaction complex mechanism with numerous possible steps the formation isophor...
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