Biuret polyisocyanate
WebStorage-stable biuret polyisocyanates useful, e.g., for the production of paints and adhesives, are prepared by reacting at least one aliphatic, alicyclic or arylaliphatic … WebOct 28, 2016 · Solvent-free hexamethylene diisocyanate (HDI)-based polyisocyanates were prepared by cyclotrimerization of HDI monomer using tri-n-butylphosphine (TBP) as a catalyst, and characterized by gel …
Biuret polyisocyanate
Did you know?
Webin the United States to promulgate a short-term exposure limit (STEL) for HDI-based polyisocyanates biuret and isocyanurate. Based on these absorption rates for a slow-drying clearcoat after 10 min (1.33 mgcm2 h 1) or 60 min (0.219 mgcm2 h ), we calculated that 6.5 and 40 min dermal exposure, WebAug 27, 2003 · Covestro Desmodur® N 75 BA by Covestro is an aliphatic polyisocyanate resin based on HDI and dissolved in n-butyl acetate. Used primarily as the hardenerponent for lightfast twoponent polyurethane view more Desmodur® N 75 BA/X CovestroAlifatik Polyisocyanate Hdi Biuret Pemeras Lightfast Polyurethane Menyembuhkan Agen N 75 …
WebA method of preparing biuret polyisocyanates by reacting diisocyanates with up to about 0.4 mol per mol of diisocyanate of a monohydric tertiary alcohol in the presence of from about 0.001 to about 0.1 mol per mol of tertiary alcohol of a catalyst consisting of salts and salt mixtures of nitrogen containing bases and organic or inorganic acids at a … WebThe present invention relates to a process for the preparation of polyisocyanates which have a biuret structure of reacting excess quantities of aliphatic diisocyanates with biuretizing agents at elevated temperature, characterized in that the biuretizing agent contains (a) α,α,α-trisubstituted acetic acids which do not contain isocyanate-reactive …
WebMar 1, 2024 · DESMODUR® N100 by Covestro is an aliphatic solvent-free HDI biuret polyisocyanate. It can be thinned with ethyl acetate, butyl acetate, methoxypropyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene and solvent naphtha® 100. DESMODUR® N100 has a shelf life of 6 months. WebAug 27, 2003 · Basonat® HB 100 by BASF is a solvent-free, aliphatic polyisocyanate based on biuret-modified hexamethylene diisocyanate (HDI). Exhibits excellent weather …
WebThe composition of polyisocyanates (IPDI and HDI) in the samples varied greatly, with maximum amounts ranging from up to 58% for HDI biuret to 96% for HDI isocyanurate. There was a significant ...
WebThe invention relates to a method for preparing HDI (hexamethylene diisocyanate) biuret, removing free HDI and preparing paint by virtue of a crystallization water method. The method provided by the invention comprises the following steps of: adding different crystallization water compounds to react with HDI, eliminating white polyurea particles … the oviatt buildingWeb1,6-Hexamethylene diisocyanate (HDI) is an aliphatic diisocyanate used in the manufacture of higher molecular weight biuret and trimer polyisocyanate resins. These resins are … shurley jingle 20WebAug 27, 2003 · Tolonate™ HDB 75 BX by Vencorex is an aliphatic polyisocyanate biuret (HDI homo-polymer). Enables good compatibility with polyesters, excellent abrasion-, … shurley jingle 19WebThe second component is a polyisocyanate, known as a ‘hardener’; a substance containing two or more isocyanate groups. Polyisocyanates used for the preparation of polyurethane coatings derive mainly from two basic isocyanates: an aromatic isocyanate, tolylene diisocyanate (TDI) and an aliphatic diisocyanate, hexamethylene diisocyanate (HDI). shurley instructional materials level 4WebDescribed is an aqueous one-component coating composition comprising dispersed polyurethane and phyllosilicate. The polyurethane carries acid groups which are at least partially neutralized with a hydrophilic base selected from inorganic bases and organic mono-amines. The hydrophilic base has a water solubility at 20° C. of at least 150 g/l, … theo vickersWebBlocked Polyisocyanates are supplied as 100% solids and/or dissolved in a variety of solvents. Polyisocyanates are either based on HDI or IPDI. The most common products … theo victoireWebThe composition of polyisocyanates (IPDI and HDI) in the samples varied greatly, with maximum amounts ranging from up to 58% for HDI biuret to 96% for HDI isocyanurate. … the oviatt library