摘要:
A room temperature-curable organopolysiloxane composition is proposed which is useful as a material for imprinting or blocking of forms of, for example, medical and dental prostheses without the problem of curing retardation or incomplete curing. The composition comprises a vinyl-containing organopolysiloxane, organohydrogenpolysiloxane, platinum catalyst, inorganic filler, liquid paraffin or petrolatum and antioxidant. The antioxidant serves to protect the liquid paraffin or petrolatum from oxidation to produce oxidized compounds which may deactivate the platinum catalyst to cause curing retardation or incomplete curing.
摘要:
The organopolysiloxane composition is useful as a potting or encapsulating material having a gel-like consistency for protecting electronic components even at an extremely low temperature as is encountered in the space industry. The composition is basically of the type in which crosslinks are formed by the addition reaction between silicon-bonded vinyl groups in an organopolysiloxane and silicon-bonded hydrogen atoms in an organohydrogenpolysiloxane but the outstanding cold resistance of the gel-like material obtained from the composition is imparted by incorporating specific silethylene-containing units of the unit formula OSiMe--CH.sub.2 CH.sub.2 --SiMe.sub.2 O.sub.0.5 into the organopolysiloxane in a specified molar content.
摘要翻译:有机聚硅氧烷组合物可用作具有凝胶状稠度的灌封或封装材料,即使在空间工业中遇到的极低温下也能保护电子元件。 组合物基本上是通过有机聚硅氧烷中与硅键合的乙烯基与有机氢聚硅氧烷中与硅键合的氢原子之间的加成反应形成交联的类型,但由组合物获得的凝胶状材料的出色的耐寒性为 通过将单元式OSiMe-CH 2 CH 2 -SiMe 2 O 0.5的特定的含有亚乙烯基的单元以特定的摩尔含量加入有机聚硅氧烷中。
摘要:
The present fluorosilicone composition is an addition reaction curable composition that uses, as an alkenyl group-containing organopolysiloxane, a fluorine-containing organopolysiloxane represented by the following general formula (1): ##STR1## wherein R represents a vinyl group, R.sup.1 represents an alkyl group or a phenyl group, R.sup.2 represents a group represented by the following formula (2): ##STR2## in which p is an integer of 2 to 8 and q is an integer of 1 to 10, and n and m are each a positive integer. This composition can form a gellike cured product particularly excellent in acid resistance.
摘要:
The invention provides an efficient method for improving the adhesive bonding strength of various types of rubbery sealant compositions, e.g. room temperature curable silicone rubber composition, to the substrate surface on which it has been cured. The method comprises coating the substrate surface with or admixing the sealant composition before application to the substrate surface with an adhesion promotor which is a reaction product of a reaction mixture comprising:(a) 1 mole of an organic amine compound having at least one active hydrogen atom in a molecule or an aminoalkyl alkoxysilane compound;(b) from 0.5 to 4 moles of an organic compound having at least one epoxy group in a molecule or an epoxyalkyl alkoxysilane; and(c) from 0.5 to 12 moles of an alkoxysilane represented by the general formula R.sup.1.sub.a Si(OR.sup.2).sub.4-a, in which R.sup.1 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, R.sup.2 is a monovalent hydrocarbon group having 1 to 4 carbon atoms or an alkoxy-substituted alkyl group and a is a number of zero, 1, 2 or 3, or a partial hydrolysis product thereof, at least one of the components (a) and (b) being an aminoalkyl alkoxysilane or an epoxyalkyl alkoxysilane, respectively.
摘要:
A method for concentration of fine particles dispersed in a dispersion into an ionic liquid comprising, adding an ionic liquid, especially an organic ionic liquid at ordinary temperature, e.g., a salt of 1-butyl-3-methylimidazolium with PF6− to a dilute dispersion of fine particles so as to concentrate the fine particles into the ionic liquid.
摘要:
A system for processing supercritical and subcritical fluid capable of bringing the inside of at least one processing container (1) formed in a flow passage into a supercritical or subcritical high pressure field, wherein thermal operation is applied to process fluid to apply thermal expansion to the fluid to produce a pressure difference between the processing container (1) and the outside, whereby a specified temperature and the high pressure field suitable for the processing of the supercritical or subcritical fluid can be provided in the processing container (1).
摘要:
Novel fluorinated unsaturated glycidyl ethers are prepared by reacting 1,1,1-trifluoro-2-trifluoromethyl-3-buten-2-ol or 1,1,1-trifluoro-2-trifluoromethyl-4-propen-2-ol with chloromethyloxirane in the presence of onium salts. The fluorinated unsaturated glycidyl ethers are, in turn, subject to addition reaction with hydrosilanes in the presence of transition metal catalysts, obtaining novel silicon-modified glycidyl ethers or fluorinated organic silicon compounds.
摘要:
Novel siloxane compounds containing a SiH group, an alkoxy or epoxy group-containing organic group attached to a silicon atom, and a perfluoropolyether group-containing organic group, each at least one per molecule, are useful tackifiers for imparting good adhesion to various resins and even fluorinated silicone resins.
摘要:
An organopolysiloxane composition comprising an organopolysiloxane and compounded therein a silica fine powder treated with a silazane compound containing a group represented by the following formula: ##STR1## wherein Rf represents a fluorine-containing organic group; R.sup.2 represents a monovalent hydrocarbon group containing no fluorine atom; R.sup.3 represents a divalent hydrocarbon group; and c is an integer of 0, 1 or 2. The composition has superior release properties and transparency.
摘要:
A novel fluorine-containing organosilicon compound represented by Formula (I): ##STR1## wherein n represents an integer of 0 or more, R.sup.1 and R.sup.2 may be the same or different and each represent a hydrogen atom or a fluorine atom, and R.sup.3 represents an alkylene group having 1 to 6 carbon atoms.This compound is useful as silica treatments, or surface treatments capable of imparting water repellency, oil repellency, etc. on the surface of glassware or the like.