摘要:
Silicone doughs suitable for incorporation into diorganopolysiloxane compositions crosslinkable into elastomeric state are rapidly and conveniently formulated by continuously and simultaneously individually introducing along the longitudinal axis of a twin-screw extruder, via a plurality of longitudinally spaced discrete inlet entries, and twin-screw extruding (a) a polydiorganosiloxane oil having a viscosity at 25.degree. C. of less than 500,000 mPa.s and containing at least two .tbd.Si-CH=CH.sub.2 functional groups per molecule, (b) water, (c) silica, and (d) a polysilazane which is liquid under normal conditions of temperature and pressure.
摘要:
Room temperature vulcanizable platinum group metal catalyzed silicone compositions are provided which utilize an N-heterocyclic adhesion promoter, such as 2,6 bis(trimethoxysilyltrimethyleneoxy)pyridine. Cohesive bonding is effected on various substrates.
摘要:
Solid stabilizers for polymers comprises a blend of (a) organic polymer and (b) at least one silicon-containing compound having a sterically hindered amine group in the molecule in quantities of between 40% and 50% by weight of the final solid blend.
摘要:
Methods for incorporating beneficial components into polymeric materials are disclosed. In one embodiment, the method comprises introducing a reactable UV light absorbing component into a cross-linked and/or solid polymeric material containing reactable groups, and subjecting the reactable UV light absorbing component to conditions effective to chemically react the reactable UV light absorbing component with the reactable groups of the solid polymeric material.
摘要:
An ultraviolet light absorbing silicone composition is disclosed which comprises silicone base polymer and ultraviolet light absorbing component present as, or derived from, one or more silicon-containing ultraviolet light absorbing benzotriazole derivatives. Also disclosed are methods for producing such silicone compositions and derivatives. Such silicone compositions, which are preferably optically clear, are useful as lens materials.
摘要:
A coating composition comprising (A) a polyorganosiloxane graft copolymer emulsion, (B) a reaction product between an amino functional silane and/or a hydrolyzate thereof and an acid anhydride, (C) colloidal silica, (D) a curing catalyst, and (E) an inorganic filler is useful in coating exterior and interior building materials. The composition is applicable to a substrate to form a coating at room temperature having sufficient extensibility to follow cracks in the underlying substrate as well as low-to-high temperature sensitive performance, moisture permeability, flame retardance, and decorative effect.
摘要:
An extrudable, self-extinguishing, room temperature-curable organopolysiloxane is obtained by combining a polydiorganosiloxane having hydrolyzable groups at the terminals, aluminum hydroxide microparticles having diameters not exceeding 50 micrometers, calcium carbonate microparticles having diameters not exceeding 20 micrometers, platinum or a platinum compound, and silane or siloxane containing at least three hydrolyzable groups.
摘要:
The present invention is directed to a novel composition and the use thereof in various coating applications. The composition broadly comprises:a) an organic compound containing a primary amino group and an alkoxysilane group, andb) a plastic precursor containing at least two acetoacetate and/or acetoacetamide groups per molecule.
摘要:
A binder composition for producing articles of bonded particulate material such as foundry molds or cores comprises an alkaline aqueous solution of a resol phenol-aldehyde resin, an oxyanion which can form a stable complex with the resin, and a phenyl ethylene glycol ether. The binder composition has an alkali to phenol molar ratio of from 1.5:1 to 2.5:1 and the amount of alkali present in the solution is sufficient to substantially prevent stable complex formation between the resin and the oxyanion. Bonded articles are produced by passing carbon dioxide gas through articles formed from a mixture of particulate material and the binder composition so as to produce stable complex formation and curing of the resin.
摘要:
The present invention provides methods for treating reclaimed sand obtained from dismantled foundry molds and cores which contain a cured binder derived from an ester cured alkaline phenolic resin. Treatment of the reclaimed sand with a silane solution, particularly an aqueous solution, enhances the tensile strengths of foundry molds and cores produced therefrom beyond those obtained with untreated reclaimed sand. Methods for producing foundry cores and molds which incorporate such a treatment process are also provided by this invention as are raw batch formulations.