12%), while prepolymer refers to systems with low levels of free isocyanates (<12%). All Rights Reserved. Copyright © Dow (1995-2020). All Rights Reserved. Substance identity Substance identity The ‘Substance identity’ section is calculated from substance identification information from all ECHA databases. The basic polyurethane chemicals division of BASF in North America is a major supplier of aromatic isocyanates (MDI, TDI) and polyols used by manufacturers of polyurethane products for CASE applications, flexible foam, engineered wood products, rigid polyisocyanurate boards and … You must accept before you can continue. The substance identifiers displayed in the InfoCard are the best available You have chosen to remove your account. Prepolymers offer an attractive approach allowing one to prepare cast systems, especially elastomers, from entirely liquid components. Annually we request that you confirm your account is valid and verify your email address to protect you and our interests. Transportation innovation for a world on the move, Pioneering a new age of beauty? MobilityScience™ Information on our speakers presenting at the IEC 2020 Conference and how to request a meeting with our team. Copyright © Dow (1995-2020). Other viscosity-building cross-linking reactions occur in making prepolymers such as formation of allophanates and biurets that are more prevalent in NCO-rich environments. In principle, a prepolymer could be formed by reacting diisocyanates with an excess of polyol to produce a polyol functional prepolymer with urethane functionality at its center, but this is not practiced commercially and the term "prepolymer" is always used to refer to polyols terminated with isocyanate functionality. In principle, a prepolymer molecular Please try again later. Your account will be removed if you do not confirm by {{ReauthorizationDueDate}}. {{propertyFacet.label}} : {{propertyFacet.value.unit}}. Lastly, it is believed that the prepolymer allows one to "prebuild in" the final polymer properties and obtain a more uniform final polyurethane structure [107, 108]. Polyurethanes are one of the most versatile plastic materials available. Please Contact Dow for additional information. This is particularly true in cast urethane systems where mixing and physiochemical polymer kinetics are more limited and make obtaining equilibrium-phase structures more difficult (see Chapter 9). Minimization of viscosity is usually a function of pH control, which under basic conditions can result in trimerization of the isocyanate. Login with your account details to get access to our exclusive content. ECHELON MC 401 Prepolymer must be protected against humidity and must be stored in unopened drums. Safety [{"values":[{"value":"Português-Portuguese","languageCode":"pt-br","link":"javascript:void(0);"},{"value":"日本語-Japanese","languageCode":"ja-jp","link":"javascript:void(0);"},{"value":"中文-Chinese","languageCode":"zh-cn","link":"javascript:void(0);"},{"value":"English","languageCode":"en-us","link":"javascript:void(0);"},{"value":"Español-Spanish","languageCode":"es-es","link":"javascript:void(0);"},{"value":"한국어-Korean","languageCode":"ko-kr","link":"javascript:void(0);"}],"label":"BR","default":"pt-br"},{"values":[{"value":"Português-Portuguese","languageCode":"pt-br","link":"javascript:void(0);"},{"value":"日本語-Japanese","languageCode":"ja-jp","link":"javascript:void(0);"},{"value":"中文-Chinese","languageCode":"zh-cn","link":"javascript:void(0);"},{"value":"English","languageCode":"en-us","link":"javascript:void(0);"},{"value":"Español-Spanish","languageCode":"es-es","link":"javascript:void(0);"},{"value":"한국어-Korean","languageCode":"ko-kr","link":"javascript:void(0);"}],"label":"JP","default":"ja-jp"},{"values":[{"value":"Português-Portuguese","languageCode":"pt-br","link":"javascript:void(0);"},{"value":"日本語-Japanese","languageCode":"ja-jp","link":"javascript:void(0);"},{"value":"中文-Chinese","languageCode":"zh-cn","link":"javascript:void(0);"},{"value":"English","languageCode":"en-us","link":"javascript:void(0);"},{"value":"Español-Spanish","languageCode":"es-es","link":"javascript:void(0);"},{"value":"한국어-Korean","languageCode":"ko-kr","link":"javascript:void(0);"}],"label":"CN","default":"zh-cn"},{"values":[{"value":"Português-Portuguese","languageCode":"pt-br","link":"javascript:void(0);"},{"value":"日本語-Japanese","languageCode":"ja-jp","link":"javascript:void(0);"},{"value":"中文-Chinese","languageCode":"zh-cn","link":"javascript:void(0);"},{"value":"English","languageCode":"en-us","link":"javascript:void(0);"},{"value":"Español-Spanish","languageCode":"es-es","link":"javascript:void(0);"},{"value":"한국어-Korean","languageCode":"ko-kr","link":"javascript:void(0);"}],"label":"US","default":"en-us"},{"values":[{"value":"Português-Portuguese","languageCode":"pt-br","link":"javascript:void(0);"},{"value":"日本語-Japanese","languageCode":"ja-jp","link":"javascript:void(0);"},{"value":"中文-Chinese","languageCode":"zh-cn","link":"javascript:void(0);"},{"value":"English","languageCode":"en-us","link":"javascript:void(0);"},{"value":"Español-Spanish","languageCode":"es-es","link":"javascript:void(0);"},{"value":"한국어-Korean","languageCode":"ko-kr","link":"javascript:void(0);"}],"label":"ES","default":"es-es"},{"values":[{"value":"Português-Portuguese","languageCode":"pt-br","link":"javascript:void(0);"},{"value":"日本語-Japanese","languageCode":"ja-jp","link":"javascript:void(0);"},{"value":"中文-Chinese","languageCode":"zh-cn","link":"javascript:void(0);"},{"value":"English","languageCode":"en-us","link":"javascript:void(0);"},{"value":"Español-Spanish","languageCode":"es-es","link":"javascript:void(0);"},{"value":"한국어-Korean","languageCode":"ko-kr","link":"javascript:void(0);"}],"label":"KR","default":"ko-kr"}]. 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polyurethane prepolymer msds

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The definition of %NCO is by equation, where Y= the equivalent weight of the isocyanate, X= equivalent weight of the polyol, the weight of NCO = 42, and X+ Z= the number of grams of isocyanate that must be reacted with Y grams of polyol to make a M100% NCO prepolymer or, As an example, if it is desired to prepare a 12.5% NCO prepolymer with methylene bisphenyl diisocyanate (MDI) (equivalent weight = 125 g/NCO eq) with a polyol having equivalent weight= 1633 g/eq; using the equation for Z, one would need. Smaller quantities would be prepared by a simple ratio adjustment. 55 °C), which could shorten the window for convenient processing considerably. The excess isocyanate is required to prevent molecular weight growth caused by opportunistic chain extension of unreacted polyol reacting with the isocyanate-terminated prepolymer. Thus, N+Z= 125 +1041 = 1166g of isocyanate per 1633 g of polyol (total mass of 2799 g) to make the desired 12.5% NCO. Click here to begin the process. As a practical consideration, prepolymers are usually used and defined on the basis of their percent isocyanate or more commonly as "percent NCO." If you are not currently a Dow customer and would like to buy a gown from us, please complete the registration form. Diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI) sold under the Lupranate® name. We have found an existing account with credentials. Items in your cart might be affected by address change. Using pure MDI, for instance, would require that all ingredients be heated to a temperature greater than the MDI melting point (ca. A true "prepolymer" in this regard would then distill the excess isocyanate from the product. Please login or reset your password. Your account has a credit block in place. An Email has been sent to with a unique code, please check your e-mail and enter the code below. By clicking the “Accept” button below, you are consenting to receive and store cookies from our site. at Dow’s virtual booth. Remember, you can manage cookies in your browser’s settings. Described herein is a polyurethane sealant composition comprising (1) a urethane prepolymer having an isocyanate functionality of at least about 2.0 and a molecular weight of at least about 2,000; and (2) the reaction product of a secondary amino- or mercaptoalkoxy silane and a polyisocyanate having an average of at least one silane group and at least one isocyanate group per … Additionally, a prepolymer will usually provide better compatibility between additional polyurethane formulation components since the reacted systems provide lower surface tension to other chemicals within the solubility parameter range. We request that you confirm your website account is valid and verify your email address. Are you sure? In practice, quasi-prepolymer refers to systems with relatively high levels of free isocyanate (>12%), while prepolymer refers to systems with low levels of free isocyanates (<12%). All Rights Reserved. Copyright © Dow (1995-2020). All Rights Reserved. Substance identity Substance identity The ‘Substance identity’ section is calculated from substance identification information from all ECHA databases. The basic polyurethane chemicals division of BASF in North America is a major supplier of aromatic isocyanates (MDI, TDI) and polyols used by manufacturers of polyurethane products for CASE applications, flexible foam, engineered wood products, rigid polyisocyanurate boards and … You must accept before you can continue. The substance identifiers displayed in the InfoCard are the best available You have chosen to remove your account. Prepolymers offer an attractive approach allowing one to prepare cast systems, especially elastomers, from entirely liquid components. Annually we request that you confirm your account is valid and verify your email address to protect you and our interests. Transportation innovation for a world on the move, Pioneering a new age of beauty? MobilityScience™ Information on our speakers presenting at the IEC 2020 Conference and how to request a meeting with our team. Copyright © Dow (1995-2020). Other viscosity-building cross-linking reactions occur in making prepolymers such as formation of allophanates and biurets that are more prevalent in NCO-rich environments. In principle, a prepolymer could be formed by reacting diisocyanates with an excess of polyol to produce a polyol functional prepolymer with urethane functionality at its center, but this is not practiced commercially and the term "prepolymer" is always used to refer to polyols terminated with isocyanate functionality. In principle, a prepolymer molecular Please try again later. Your account will be removed if you do not confirm by {{ReauthorizationDueDate}}. {{propertyFacet.label}} : {{propertyFacet.value.unit}}. Lastly, it is believed that the prepolymer allows one to "prebuild in" the final polymer properties and obtain a more uniform final polyurethane structure [107, 108]. Polyurethanes are one of the most versatile plastic materials available. Please Contact Dow for additional information. This is particularly true in cast urethane systems where mixing and physiochemical polymer kinetics are more limited and make obtaining equilibrium-phase structures more difficult (see Chapter 9). Minimization of viscosity is usually a function of pH control, which under basic conditions can result in trimerization of the isocyanate. Login with your account details to get access to our exclusive content. ECHELON MC 401 Prepolymer must be protected against humidity and must be stored in unopened drums. 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November 13, 2020 |

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