Biuret polyisocyanate
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 …
Biuret polyisocyanate
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WebHDI biuret. BASONAT HB series offers superior weather and chemical resistance with excellent gloss retention adn light stability. These products are compatible with a wide … 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 …
WebThe process of claim 1, wherein the free-radically crosslinkable component (KK) comprises an average carbamate and/or biuret and/or allophanate and/or urea and/or amide groups content of more than 0 to 2.0 mol per 1000 g of reactive component (KK). 3. WebThe biuret polyisocyanates provided by this invention may be used as adhesives or in the preparation of a composition which will form a polyurethane coating, such as, for …
WebDec 3, 2014 · The invention relates to a method for preparing a hexamethylene diisocyanate biuret curing agent. The method comprises the following step of: adding different crystallized hydrates or a mixture of acetone and water to make water react with hexamethylene diisocyanate, removing white polyurea particles generated in the reaction … WebDescribed 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, …
Weba core consisting of a center and at least one intermediate layer covering the center; and a cover covering the core, wherein the cover is formed from a cover composition containing a thermoplastic polyurethane (A), a polyisocyanate compound (B) having at least two isocyanate groups, and a polyhydroxyether (C) as a resin component, wherein the cover …
Webexample is the biuret of HDI, which consists of three molecules of HDI monomer joined together to form a higher molecular weight oligomer having similar characteristics to those found in the monomer. Also, many MDI product formulations consist of a combination of MDI monomer and a MDI-based polyisocyanate (such does coffee have iodineWebin 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, does coffee have laxativeWebAug 5, 2024 · Tolonate™ HDB 75 MX by Vencorex is an aliphatic polyisocyanate biuret (HDI homo-polymer). Shows good compatibility with polyesters, excellent abrasion-, … does coffee have magnesiumWebA 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 … ez-rjprotm hd crimp toolWebStorage-stable biuret polyisocyanates useful, e.g., for the production of paints and adhesives, are prepared by reacting at least one aliphatic, alicyclic or arylaliphatic diisocyanate with a biuret-forming reactant, in the presence of an effective amount of at least one organic carboxylic acid and/or anhydride thereof. ezrme new siteWebBlocked 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 … ez rocks showroomWebThe 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. … ez rods window tension rod