摘要:
Aqueous dispersions of organopolysiloxanes comprising (A) an organopolysiloxane containing groups which are capable of condensation, (B) a condensation catalyst, (C) an organopolysiloxane resin which is at least partly soluble in organopolysiloxane (A) when present in amounts of up to 50% by weight based on the weight of (A), (D) a compound containing basic nitrogen and (E) polyvinyl alcohol. The aqueous dispersions are prepared by dissolving the organopolysiloxane resin (C) in the organopolysiloxane (A) and then emulsifying the solution with polyvinyl alcohol (E) and water. The stable aqueous dispersions of the present invention cure to form transparent films.
摘要:
Organo(poly)siloxanes composed of units of the formula [R.sub.a R.sup.1.sub.3-a SiO.sub.1/2 ], [R.sub.b R.sup.1.sub.2-b SiO.sub.2/2 ] and [R.sup.1 SiO.sub.3/2 ], in which R can be the same or different and represents a monovalent organic radical which is free from aliphatic carbon-carbon multiple bonding, R.sup.1 can be the same or different and represents a monovalent organic radical which has at least one aliphatic carbon-carbon multiple bond, a is 0, 1 or 2 and b is 0 or 1.
摘要:
Aqueous dispersions of organopolysiloxanes containing the following components:(A) Organopolysiloxane having groups which can undergo condensation;(B) condensation catalyst;(C) organopolysiloxane resin; and(D) diorganosilanolate and/or condensation products thereof formed by splitting off water.
摘要:
Aqueous dispersions organopolysiloxanes which are free of organic transition metal compounds and of organic compounds of the metals of the main groups III, IV and V. These dispersions can be produced using the following starting compounds:(A) organopolysiloxane containing condensation-capable groups;(B) an organosilicon compound of the formula{[(RO).sub.3 Si--R.sup.3 --].sub.e R.sup.2.sub.1-e }.sub.a Si(OR).sub.4-a(II),in whichR is identical or different and is a hydrogen atom or alkyl radical having 1 to 6 carbon atoms,R.sup.2 is identical or different and is an SiC-bonded hydrocarbon radical having 1 to 18 carbon atoms, optionally substituted with halogen atoms, ether groups, ester groups, epoxy groups, mercapto groups or (poly)glycol radicals comprised of oxyethylene units, oxypropylene units and mixtures thereofR.sup.3 is identical or different and is a divalent hydrocarbon radical,a is 0 or 1, ande is 0 or 1 where {[(RO).sub.3 Si--R.sup.3 --].sub.e R.sup.2.sub.1-e }.sub.a of formula (II) is optionally a partial hydrolyzate having not more than 8 Si atoms;(C) an organosilicon compound containing basic nitrogen.
摘要:
This invention relates to an improved composite material leading edge/spar member for an aircraft control surface, and the like. The present invention provides a one-piece composite leading edge/spar member that is of a lighter and stronger construction offering dimensional stability, and an efficient method for manufacturing the same is also provided. A one-piece leading edge/spar member (12) includes a forward leading edge portion (22), and an aft spar portion (23). The forward leading edge and the aft spar portions are connected together as a continuous one-piece tubular member of composite material. The forward leading edge portion (22) may be rounded, and the aft spar portion (23) may include an aft web portion (24) and first and second rebate portions (26, 28). The rebate portions (26, 28) connect the web portion (24) to the rounded forward leading edge portion (22), and provide surfaces for the attachment of skin surface members (16, 18) thereto.
摘要:
A device for automated composite lay up of a part to be manufactured—such as a large aircraft fuselage—includes a mandrel having a vertical axis and an interior mandrel surface that conforms to an outside mold line of the part. A vertical movement shaft is disposed inside the mandrel. A platform is supported, moved up and down, and rotated on the vertical movement shaft. One or more arm mechanisms are attached to the platform. One or more material delivery heads are supported by the arm mechanisms, and the arm mechanisms moves and positions the material delivery heads relative to the interior mandrel surface so that composite material is delivered directly to the outside mold line on the interior mandrel surface.
摘要:
A three-stage process for the continuous preparation of RTV-1 compositions comprises, in a first step, preparing a raw mixture of &agr;,&ohgr;-dihydroxypolydiorganosiloxane, filler and, if desired, further constituents, in a second step, freeing the raw mixture of gas inclusions under reduced pressure and, if desired, mixing it with further constituents and, in a third step, mixing the degassed raw mixture with a crosslinker, a condensation catalyst and, if desired, additional constituents not yet added in the first and second steps.
摘要:
A process for the continuous preparation of organopolysiloxane by condensation and/or equilibration reaction of organosilicon compounds comprising in a first step conveying an organosilicon compound, catalyst which is solid in the reaction mixture at least at the reaction temperature and, optionally, additives continuously from the bottom upwards through a heated cylindrical reactor which is arranged in a standing position and whose contents can be agitated mechanically and in a second step passing the reaction mixture obtained after leaving the reactor at the upper end thereof continuously through a cylindrical reactor and in a third step freeing the reaction mixture obtained of catalyst after exit from the reactor.
摘要:
The invention relates to a process for stabilizing organopolysiloxanes which contain phosphazenes and/or their reaction products which promote the condensation and/or equilibration of organopolysiloxanes. To stabilize any previously known organopolysiloxanes which contain phosphazenes and/or their reaction products against re-arrangements and also molecular weight changes and viscosity changes resulting therefrom, it is proposed that the said phosphorus compounds be brought into contact with at least one non-basic, solid adsorbent.
摘要:
The invention relates to organo(poly)siloxane compositions which have long shelf life in the absence of water, but can be crosslinked in the presence of water, even at room temperature, to give elastomers with elimination of alcohols, and to a process for the preparation of such compositions.