摘要:
The present invention relates to a method of degrading a phenol resin-containing material, characterized in that the phenol resin-containing material is subjected to an aminolysis with a reagent containing at least one amino group, and to a method of constructing and deconstructing a phenol resin-containing material, characterized in that the phenol resin-containing material is produced by curing the starting components at a temperature of below 140°C and, for the purpose of degradation, subjecting them to an aminolysis with a reagent containing at least one amino group. The inventors have additionally discovered a method of producing a novolak partly or fully degradable by aminolysis, comprising the steps of: (a) reacting a phenolic component with an aldehyde in the presence of (i) an acid, (ii) an aminic hardener and (iii) a triglyceride or a triglyceride mixture, and (b) hardening the resin formed in (a) at a temperature of ≤ 180°C, preferably of ≤ 140°C. And finally, the invention provides a method of recycling a phenol resin-containing material, comprising – the degrading of the material by aminolysis, forming a liquid and possibly components that have remained in the solid state, – in the case of components that have remained in the solid state, the separating of these components from the liquid, – the treating of the liquid for removal of volatile products, preferably under reduced pressure and/or at elevated temperature, to form a nonvolatile residue, – the mixing of the nonvolatile residue with starting materials required for a phenol resin synthesis or with one or more compounds selected from monomers, oligomers and polymers having at least two functional groups which react with amino groups and/or hydroxyl groups.
摘要:
The invention relates to a cyanate resin that can be obtained by mixing at least (i) at least one difunctional, oligofunctional, and/or polyfunctional cyanate and/or at least one prepolymer thereof, optionally in combination with at least one additional copolymerizable component, and (ii) at least one siloxane and/or siloxane-containing compound. The invention is characterized in that the resin contains a linear polydialkylsiloxane with a viscosity ranging from 500 to 1500 and/or a polydialkylsiloxane caprolactone or caprolactam copolymer as the siloxane and/or the siloxane-containing compound. The invention further relates a substrate that is saturated or coated with said type of cyanate resin and to a duromer that can be obtained by compressing and/or heating the cyanate resin or the saturated or coated substrate.
摘要:
The present invention relates to polysiloxane nanoparticles having the following properties: an average particle size d 50 (measured using REM recordings) in the range of 10-200 nm, a specific surface area A o of at least 50 m 2 /g, a pore volume of at least 0.2 cm 3 /g, an average pore volume d 50 of at least 0.8 nm, wherein the particles have groups that contain carbon, which groups are bonded to the silicon at least partially in the form of unsubstituted or substituted alkyl, alkenyl, aryl, arylalkyl, or alkylaryl groups. Said polysiloxane nanoparticles can be produced, among other things, in that either a silazane or a mixture of different silazanes having one or more -[Si(R)(R 1 )-NR 2 ]- units and/or a silane or a mixture of different silanes having the formula R' a SiX 4-a or an oligosiloxane obtainable by means of hydrolytic condensation of said silane/said silanes or a mixture of such oligosiloxanes are provided in a solvent and brought in contact with a strongly alkaline medium in such a way that the pH is not below 13 after the addition thereof. In specific embodiments, synthesis in acid is also successful.
摘要:
The invention relates to hybrid pre-polymers and polymers produced by converting difunctional, oligofunctional and/or polyfunctional cyanates and/or pre-polymers thereof with monomer, oligomer and/or polymer silazanes. The polymers are duromers having high glass transition temperature and very high fracture toughness from the respective cyanate output materials. They can be dissolved in a pre-polymerized state in solvents and are therefore suitable as impregnating resins for prepregs, for example. In addition, they can be processed to moulded articles. The fire characteristics thereof are particularly exceptional.
摘要:
The invention relates to a cyanate adhesive for gluing especially cyanate-containing friction linings onto a substrate, comprising a) 5 to 80 wt.- % cyanate resin, b) 5 to 30 wt.- % organic polymer, selected from natural and synthetic rubber and thermoplastic polymers, c) 0 to 20 wt.- % of a reinforcing agent, and optionally d) further additives and adjuvants. The adhesive, together with a friction material mixture that contains a cyanate resin as the curable binder, represents a kit for producing a friction lining, from which such a friction lining having advantageous properties can be produced. It is most preferred that the cyanate resin of the adhesive and that of the friction material mixture are identical or chemically very similar.