摘要:
The invention concerns a coating composition capable of being cold vulcanised (EVF), characterised in that it comprises, in a mixture: (1) at least one polyorganosiloxane having, per molecule, at least two C2-C6 alkenyl groups bound to silicon; (2) at least one polyorganosiloxane having, per molecule, at least two hydrogen atoms bound to silicon; (3) a catalytically effective amount of at least one catalyst, consisting of at least one metal belonging to the platinum group; (4) an adherence promoter; (5) optionally a reinforcing system which can be at least a polyorganosiloxane resin and/or a reinforcing filler; (6) optionally at least one cross-linkage inhibitor; (7) and mineral or organic hollow microspheres.
摘要:
The invention concerns a method for preparing a cold-vulcanisable coating composition (CVE), and the resulting composition. The composition comprises a polyorganosiloxane with alkenyl groups bound to the silicium, a polyorganosiloxane with hydrogen atoms bound to the silicium, a catalyst, a ternary adhesion promoter consisting of an alkoxylated organosilane, an organosilicon compound comprising at least an epoxy radical, a chelate of metal and/or a metal alkoxide, a polyorganosiloxane called extender and having terminal siloxyl units with hydrogeno functions, and a reinforcing silicon filler treated in situ by a compatibility agent in the presence of polyorganosiloxane with alkenyl function, said in situ treatment consisting in preparing a filler suspension by bringing said silicon filler in the presence of the compatibility agent and polyorganosiloxane (1), thereby providing the in situ treatment of the filler. The invention further provides an elastomer with high extensibility.
摘要:
The invention concerns a cross-linkable adhesive silicone composition, and the use of said composition for bonding various substrates, comprising: a polyorganosiloxane (POS) with Si-Vi(polydimethylsiloxane &agr;,&ohgr;-dj-Vi) units; a crosslinking POS with SiH units; a platinum catalyst; an adherence promoter comprising vinyltrimethoxysilane, 3-glycidoxy-propyltrimethoxysilane and buryl titanate; and optionally a filler and/or a cross linkage inhibitor and/or an unsaturated POS resin such as MMviDDviQ or MDviQ. The invention aims at providing a highly adhesive glue having, before setting, a low viscosity adapted for easy application on the substrates to be bonded. The invention achieves this by providing a cross-linkable adhesive silicone composition as defined above and characterised in that it has a peeling force Fp≧0.25 N/mm. a viscosity &eegr;≧50.103mPa's at 25°, a tear resistance Rd≧6/mm (ASTM-624A) and a Shore hardness A≧35. The invention also concerns the use of said composition as adhesive.
摘要:
A silicone composition and the uses thereof, particularly as a coating on an airbag for protecting the occupant of a vehicle in the event of a collision, are disclosed. The aim is to provide a silicone composition suitable for coating onto the inner surface of the airbag while significantly reducing the weight of the resulting coating layer to form a protective coating having enhance high-temperature, mechanical and substrate-adhesion properties. Said aim is achieved in that the composition is free of reinforcing mineral fillers and consists of a mixture of (1) at least one polyorganosilocane with alkenyl groups bound to the silicon; (2) at least one polyorganosiloxane with hydrogen atoms bound to the silicon; (3) a cross-linking catalyst; (4) an adhesion promoter comprising (4.1) at least one alkoxylated organosilane, (4.2) at least one epoxy-functional organosilicon compound, and (4.3) at least one metal chelate and/or metal alkoxide wherein the metal is selected from the group which consists of Ti, Zr, Ge, Li, Mn, Fe, Al and Mg; (5) at least one polyorganosiloxane resin; and (6) optionally at least one cross-linking inhibitor.
摘要:
A silicone composition and the uses thereof, particularly as a coating on an airbag for protecting the occupant of a vehicle in the event of a collision, are disclosed. The aim is to provide a silicone composition suitable for coating onto the inner surface of the airbag while significantly reducing the weight of the resulting coating layer to form a protective coating having enhanced high-temperature, mechanical and substrate-adhesion properties. Said aim is achieved in that the composition is free of reinforcing mineral fillers and consists of a mixture of (1) at least one polyorganosiloxane with alkenyl groups bound to the silicon; (2) at least one polyorganosiloxane with hydrogen atoms bound to the silicon; (3) a cross-linking catalyst; (4) an adhesion promoter comprising (4.1) at least one alkoxylated organosilane, (4.2) at least one epoxy-functional organosilicon compound, and (4.3) at least one metal chelate and/or metal alkoxide wherein the metal is selected from the group which consists of Ti, Zr, Ge, Li, Mn, Fe, Al and Mg; (5) at least one polyorganosiloxane resin; and (6) optionally at least one cross-linking inhibitor.
摘要:
The invention concerns the use as additive for improving properties of resistance to arc tracking and arc erosion: of a mixture A, B or C formed by: concerning mixture A: A1: platinum; and A2: at least an inorganic compound A2.1 of a metal with several degrees of oxidation selected from the group formed by V, Cr, Mn, Fe, Co, Ni, and Cu, in which the metal atom is at a degree of oxidation higher than zero, the least possible (abbreviation: DOX mini); or A3: a combination of at least an inorganic compound A2.1 with at least an inorganic compound A2.2 in which the atom of V, Cr, Mn, Fe, Co, Ni or Cu is at a degree of oxidation higher than DOX mini; concerning mixture B: B1 platinum; and B2: at least an inorganic compound B2.1 of cerium-IV or of lanthanum-III; or B3: a combination of at least an inorganic compound B2.1 with at least an inorganic compound B2.2 of titanium-IV; concerning mixture C3: C1 platinum; and C2 a combination of constituent A2 or A3 with the constituent B2 or B3; in a polyorganosiloxane composition D for obtaining a silicon elastomer, either cross-linkable at room temperature or by heat by reaction of polyaddition in the presence of a metal catalyst, or cross-linkable at high temperature by the action of organic peroxide(s).
摘要:
Silicone material crosslinkable into silicone elastomer by polyaddition reactions is described. A material is provided offering a compromise between the following characteristics: fluidity (in non-crosslinked state), hydrophilicity (in non-crosslinked or crossliked state) and high mechanical properties (in crosslinked state). The following materials are added to crosslinkable silicone material: (i) a reinforcing siliceous filler in the form of a suspension obtained by subjecting the filler to a treatment in two stages by an agent providing compatibility and by operating in the presence of a polyorganosiloxane with Si-alkenyl functions; and (ii) one or more non-ionic, ionic or amphoteric surfactants. Said silicone material is particularly useful for impressions, for example dental impressions and for making pads used in pad printing techniques.
摘要:
The invention concerns the use as additive for improving properties of resistance to arc tracking and arc erosion: of a mixture A, B or C formed by: concerning mixture A: A1: platinum; and A2: at least an inorganic compound A2.1 of a metal with several degrees of oxidation selected from the group formed by V, Cr, Mn, Fe, Co, Ni, and Cu, in which the metal atom is at a degree of oxidation higher than zero, the least possible (abbreviation: DOX mini); or A3: a combination of at least an inorganic compound A2.1 with at least an inorganic compound A2.2 in which the atom of V, Cr, Mn, Fe, Co, Ni or Cu is at a degree of oxidation higher than DOX mini; concerning mixture B: B1 platinum; and B2: at least an inorganic compound B2.1 of cerium-IV or of lanthanum-III; or B3: a combination of at least an inorganic compound B2.1 with at least an inorganic compound B2.2 of titanium-IV; concerning mixture C3: C1 platinum; and C2 a combination of constituent A2 or A3 with the constituent B2 or B3; in a polyorganosiloxane composition D for obtaining a silicon elastomer, either cross-linkable at room temperature or by heat by reaction of polyaddition in the presence of a metal catalyst, or cross-linkable at high temperature by the action of organic peroxide(s).
摘要:
A process for increasing the surface tension (“wettability”) of a silicone element crosslinked by polyaddition from a liquid composition containing one or more α,ω-dimethylvinylpolydimethylsiloxanes (PDMS), one or more poly(dimethyl)(methylhydrogenosiloxy)-α,ω-dimethylhydrogenosiloxanes, and a platinum crosslinking catalyst. The silicone surface is treated with a homogeneous atmospheric plasma using a plasma spraying apparatus having a rotating head with one or more plasma nozzles that are offset relative to the axis of rotation, each one being capable of generating a plasma jet whose axis is parallel to said axis of rotation. The articles to which the invention relate include composites of flexible substrate (e.g. textile)/silicone coating. Application: adhesive bonding of silicone surfaces crosslinked by ≡Si—H/≡Si-vinyl polyaddition.
摘要:
The invention relates to the adhesive bonding of fibrous materials, in particular of flexible supports, such as woven supports or nonwoven supports, comprising at least one silicone coating obtained by the application of a coat or by impregnation. The aim of the invention is to provide an improved process for combining together fiber/silicone composite parts using a silicone elastomer, which process has to be economical and not very expensive to carry out. This aim is achieved by the invention, which relates to a process for the adhesive bonding of fibrous supports, this process being of the type of those consisting in causing the supports to be adhesively bonded to overlap one another, a silicone-based adhesive thermosetting by radical crosslinking using at least one peroxide being inserted between the supports over at least a portion of the region of overlap. The process is characterized in that it consists essentially in employing at least one silicone adhesive selected from Pumpable Silicone Elastomers (PSE) or Liquid Silicone Rubbers (LSR): e.g. MDDViM, comprising as filler silica treated with a silicone MOHDMOH, which are thermosetting by radical crosslinking using at least one peroxide, which are liquid at ambient temperature and which have a Brookfield viscosity η at 25° C.≧100 Pa·s and an extrusion rate Er in g.min−1≦−50; in directly forming and deploying this liquid adhesive on at least one of the supports to be adhesively bonded in their region of overlap; in holding the supports in intimate contact in their region of overlap comprising at least one layer of adhesive, so as to prevent any trapping of air at the interface; and in heating the supports thus held in intimate contact, so as to make possible the adhesive bonding of the supports by crosslinking of the adhesive.
摘要翻译:本发明涉及纤维材料的粘合剂,特别是柔性载体,例如纺织支撑体或非织造支撑物,其包括通过涂覆或浸渍获得的至少一种硅氧烷涂层。 本发明的目的是提供一种使用硅氧烷弹性体将纤维/硅酮复合部件组合在一起的改进方法,该方法必须是经济的并且不是非常昂贵的。 该目的通过本发明来实现,本发明涉及一种用于纤维支撑体的粘合剂的方法,该方法是这样一种方法,其包括使支撑体粘合地彼此重叠的那些类型,由硅基粘合剂热固化的硅氧烷基粘合剂 自由基交联使用至少一种过氧化物在重叠区域的至少一部分上插入支撑体之间。 该方法的特征在于其基本上使用至少一种选自可泵送硅酮弹性体(PSE)或液体硅橡胶(LSR)的硅氧烷粘合剂: M D D M M,其包含用硅氧烷M OH(OH)OH处理的填料二氧化硅,其通过使用至少一种过氧化物的自由基交联进行热固化, 其在环境温度下是液体的,并且其在25℃下具有Brookfield粘度等级> = 100Pa.s,挤出速率Er(g.min)≤50; 在至少一个支撑体上直接形成和展开该液体粘合剂以在其重叠区域中粘合地结合; 在其包括至少一层粘合剂的重叠区域中保持紧密接触的支撑件,以防止在界面处的任何空气捕获; 并且加热由此保持紧密接触的支撑件,从而可以通过粘合剂的交联使支撑体粘合。