摘要:
In a process for preparing a one-package RTV organopolysiloxane composition comprising (A) an organopolysiloxane containing at least two Si—OH groups or hydrolyzable groups, (B) an organosilane having at least two hydrolyzable groups or a partial hydrolyzate thereof, and (C) an inorganic filler, components (A) and (B) are premixed in a substantially anhydrous state, and component (C) is then added to the premix. Despite the absence of sag-control agents, the composition in the uncured state has a sufficient viscosity for sag-control, ease of extrusion, and improved slump properties.
摘要:
A room temperature curable organopolysiloxane composition including:(A) a diorganopolysiloxane terminated with a hydroxyl group at the both terminal ends and having a viscosity at 25.degree. C. of 25 to 1,000,000 cSt,(B) an organosilane having 3 or more hydrolyzable groups per molecule, a partially hydrolyzed and condensed product thereof or a mixture thereof, said hydrolyzable group is a ketoxime group or an alkenyloxy groups, anda thin leaf-like inorganic filler. This can give cured products with good oil resistance, and suitable as FIPG materials for automobiles.
摘要:
A dealcoholation condensation type room temperature curable composition of the present invention comprises (A) a diorganopolysiloxane blocked by mono-, di- or tri-alkoxysilyl group at both terminal ends, (B) an alkoxysilane having the formula (1):R.sup.1.sub.4-n Si(OR.sup.2).sub.n (1)wherein R.sup.1 and R.sup.2 are a monovalent hydrocarbon group and n is 3 or 4, or a partially hydrolyzed product thereof, (C) a titanate ester or a titanium complex and (D) an organosilicon compound having the formula (2): ##STR1## wherein R.sup.3 and R.sup.4 are a hydrogen atom or an alkyl group, R.sup.5 and R.sup.6 are each a monovalent hydrocarbon group, R.sup.7 is an alkyl group or an alkoxyalkyl group, a is 0 or 1 and m is an integer of 0 to 3. The composition is very excellent in shelf stability.
摘要:
A binder for cork chips is provided by an RTV organopolysiloxane composition comprising (1) a diorganopolysiloxane blocked with an alkoxysilyl group at either end of its backbone, (2) a crosslinking agent in the form of an alkoxysilane or a partial hydrolysate thereof, (3) an organic titanate, (4) a network polysiloxane comprising triorganosiloxy and SiO.sub.2 units and having a terminal SiOH group blocked with an alkoxysilyl group, and (5) an epoxy-modified alkoxysilane or a partial hydrolysate thereof. Cork plugs are obtained by mixing the composition with cork chips followed by molding and curing.
摘要:
A room temperature-curable organopolysiloxane composition, which is capable of giving a cured silicone rubber having excellent resistance against oils, e.g., automobile engine oil, and little responsible for foaming of the oil contaminated with the silicone rubber, can be prepared by first blending a silanol-terminated dimethyl polysiloxane, an iminoxy-substituted organosilane compound, e.g., vinyl tributanoxime silane, an organotin compound as a catalyst and an inorganic filler. e.g, zinc oxide, to give a uniform mixture and further admixing the uniform mixture with a trimethylsilyl-terminated dimethyl polysiloxane, an alkenyloxy-substituted organosilane compound, e.g., vinyl triisopropenyloxy silane, and a methyl polysiloxane having a network structure of the molecules as consisting of the monofunctional units of the formula (CH.sub.3).sub.3 SiO.sub.0.5 and tetrafunctional units of the formula SiO.sub.2 each in a specified amount.
摘要:
A organopolysiloxane composition suited to automobile oil seals is provided, which includes (A) a diorganopolysiloxane having a viscosity at 25.degree. C. of 25 to 1,000,000 cSt blocked with a hydroxyl group at both ends of its molecular chain; (B) an iminoxysilane having the formula (1): (R.sup.1).sub.4-n Si�--O--N.dbd.C(R.sup.1).sub.2 !.sub.n (1) wherein R.sup.1 are an unsubstituted or substituted monovalent saturated hydrocarbon group, and n is 3 or 4; (C) an amino group-containing hydrolyzable silane having the formula (2): H.sub.2 N--R.sup.2 --NH--R.sup.2 --Si(--O--R.sup.3).sub.3 (2) wherein R.sup.2 are an unsubstituted or substituted divalent saturated hydrocarbon group having 1 to 4 carbon atoms, and R.sup.3 are a monovalent saturated hydrocarbon group having 1 to 4 carbon atoms; and (D) a curing catalyst. The composition is able to maintain a low foamability even when dispersed or dissolved in automobile oils, and is cured to provide an automobile oil seal.
摘要:
A room temperature vulcanizable organopolysiloxane composition comprises (A) a diorganopolysiloxane which is blocked with an alkoxy group at both ends of a molecular chain thereof, (B) a tri or tetraalkoxysilane, (C) a titanium curing catalyst, (D) a silica filler, and (E) an alkoxysilane which is less hydrolyzable than the alkoxysilane of (B). The composition yields a cured product having high strength and high elongation and is low in viscosity and extrusion rate. A method for preparing the composition is also provided in which the ingredients (A) to (D) are first mixed together, to which the ingredient (E) is added.
摘要:
The invention relates to compounds, pharmaceutical compositions and medicaments comprising such compounds, and the use of these compounds, compositions, and medicaments in methods of treating diseases and disorders.
摘要:
The invention relates to certain amino-pyrimidine compounds that inhibit IKK epsilon and/or TBK1, methods of making such compounds, pharmaceutical compositions comprising such compounds, and the use of these compounds in treating a variety of diseases and disorders.
摘要:
A work vehicle is provided with an engine, a traveling device driven by driving force from the engine to cause the work vehicle to travel, a first hydraulic pump driven by the driving force from the engine to discharge hydraulic oil, and a cooling device having a cooling fan driven by the hydraulic oil supplied by the first hydraulic pump to cool the engine, and a control unit. The control unit performs a normal cooling control in which an upper limit fan speed is determined based on an engine speed, and a cooling suppression control in which the upper limit fan speed determined based on the engine speed is suppressed to be less than the upper limit fan speed during the normal cooling control when a predetermined operation required to increase the engine speed is performed.