摘要:
A polymer concrete comprising by weight about 40-70% coarse aggregate, about 20-55% of a fine aggregate such as sand, about 2-15% silica flour and about 8% to 12% furfuryl alcohol monomer polymerized in situ with an acid catalyst in amounts of about 8% to 12% by weight of the furfuryl alcohol monomer produces a highly cross-linked concrete which contains no cement and is mixed without water. The furfuryl polymer concrete provides the broadest range of chemical resistance of all existing polymer concretes. The coarse and fine aggregate have a pH less than 7.0 and are provided with a specific size gradation.
摘要:
Providing a process for advantageously producing spherical particles of furfuryl alcohol resin using only furfuryl alcohol without using a harmful aldehyde as a starting material. In the process, furfuryl alcohol is subjected to a self-condensation reaction in the presence of an acid catalyst, whereby a fluidic condensation resin of furfuryl alcohol is obtained. The condensation resin of furfuryl alcohol is granulated and cured using water as a reaction medium in the presence of a dispersion stabilizer and an acid catalyst having a pKa of not more than 1.5, whereby spherical cured resin particles are formed.
摘要:
Das gegenüber den bekannten säurehärtenden Bindemitteln in bezug auf Wasserfreiheit, geringere Säuremengen und Abwesenheit von stickstoffhaltigen Verbindungen vorteilhafte, neue Bindemittelsystem weist einen Gehalt an in silanisiertem Furfurylalkohol gelösten Polyestern auf.
摘要:
La présente invention concerne une solution aqueuse de poly(alcool furfurylique) pour l'encollage de fibres organique ou minérales contenant : - de 40 % à 85 % en poids de poly(alcool furfurylique), - de 15 % à 60 % en poids d'eau, et - moins de 1,5 % en poids d'alcool furfurylique, ladite solution étant caractérisée par le fait qu'elle est exempte de formaldéhyde et qu'elle présente un pH compris entre une valeur supérieure à 7,0 et 10, de préférence compris entre 7,2 et 10,0.
摘要:
This invetion is a method of bonding a window in a vehicle. The process comprises applying to a window an adhesive comprising a polymer having a flexible backbone and having silane moieties capable of silanol condensation and a tin catalyst; contacting the window with the window frame of a substrate wherein the adhesive is located between the window and the substrate; and allowing the adhesive to moisture cure. This process is especially useful when the substrate is unprimed metal, plastic or a composite, optionally coated with a coating. The method of the invention allows the bonding of a window into a substrate without the need for priming the surface of the substrate to which it is bonded. This is especially useful for bonding windows into automobiles.
摘要:
L'agent de durcissement est une solution anhydre concentrée d'anhydride borique, un ou plusieurs solvants organiques et au moins un acide concentré.