31 results about "Karstedt's catalyst" patented technology

PCT No. PCT / CA97 / 00412 Sec. 371 Date Dec. 17, 1998 Sec. 102(e) Date Dec. 17, 1998 PCT Filed Jun. 12, 1997 PCT Pub. No. WO97 / 47665 PCT Pub. Date Dec. 18, 1997The hydrosilylation of terminal double bonds in polypropylene (PP) or other polymers is effected in the melt phase. The double bonds were created by peroxide initiated degradation of PP in an extruder or a batch mixer. A hydride terminated polydimethylsiloxane is employed as a model substance to investigate the feasibility of hydrosilylating the terminal double bonds of the degraded polypropylene. The reaction may be carried out in three different reactors, namely a hot press, a batch mixer and a screw extruder. Two different reaction mechanisms may be used to effect the hydrosilylation reaction, namely a radical chain addition mechanism and a platinum catalysed mechanism with a colloid forming catalyst, platinum divinyltetramethyldisiloxane (Karstedt's catalyst). Catalytic amounts of a peroxide initiator are able to initiate the addition of silanes to the double bonds of the degraded polypropylene. Both reactions, namely degradation and hydrosilylation, may be performed simultanously. A platinum colloid formed in the initial stage of the platinum catalysed hydrosilylation may be stabilized by adding t-butylhydroperoxide as cocatalyst, which results in the hydrosilylation at high yields.

The invention relates to a preparation method for silicon carbide aerogel. The preparation method comprises the following steps: dissolving polycarbosilane and a vinyl compound in an organic solvent, and performing a catalytic reaction at 70-90 DEG C for 4-8 hours in the presence of a karstedt catalyst to obtain polycarbosilane gel, wherein the vinyl compound contains two or more vinyls; drying the polycarbosilane gel to obtain polycarbosilane aerogel; performing heat treatment on the polycarbosilane aerogel to obtain silicon carbide / carbon compound aerogel; and calcining the silicon carbide / carbon compound aerogel at 500-700 DEG C for 1-5 hours under the aerobic condition to obtain the silicon carbide aerogel. According to the preparation method, a raw material source is simple and convenient, the preparation method is simple, and the use of toxic hydrofluoric acid as a SiO2 remover is avoided; and the polycarbosilane aerogel in the preparation process does not contain oxygen, so that the silicon carbide aerogel has higher mechanical property and better high temperature resistance.

The invention discloses a method for synthesizing epoxy modified organosiloxane, which is characterized in that in a silicon hydrogen addition reaction of Si-H group-containing polysiloxanes or polysilane and an alkenyl epoxy compound, by taking a Lamoreaux catalyst, a Spaier catalyst or a Karstedt catalyst, lower alcohol is simultaneously added for being as a stabilizing agent, an epoxy compound open loop reaction due to a platinum catalyst can be eliminated, product viscosity is stabilized, and the product quality can be effectively controlled.

The invention discloses addition fluorinated silicone rubber nano antifreezing adhesive paint and a preparation method thereof, belongs to the field of organic fluorinated silicon polymer materials, and overcomes the problems of the prior art that the coating curing temperature is high and the anti-icing effect is poor. The addition fluorinated silicone rubber nano antifreezing adhesive paint consists of a component A and a component B, wherein the component A comprises the following ingredients in parts by weight: 100 parts of vinyl-terminated polysiloxane, 30 to 50 parts of vinyl-terminated trifluoropropyl polysiloxane, 20 to 30 parts of nano particles and 20 to 30 parts of solvent; the component comprises the following ingredients in parts by weight: 9 to 12 parts of end hydrogen-containing silicone oil, 9 to 10 parts of end hydrogen-containing fluorine silicone oil, 20 to 30 parts of solvent, 0.0074 to 0.012 part of Karstedt catalyst, 0.05 to 1 part of defoaming agent and 1 to 2 parts of dispersing agent. The preparation method comprises the following steps of (1) uniformly mixing the ingredients according to the weight parts to obtain the component A, ball-milling the component A, and uniformly mixing the ingredients according to the weight parts to obtain the component B; (2) uniformly mixing the component A and the component B, uniformly smearing onto the surface of the workpiece which is coated with silane undercoat, and then curing the workpiece at room temperature. By adopting the paint, the anti-icing effect is good.

The invention discloses a silicon carbide polymer precursor ceramic defect healing method, and relates to ceramic material preparation. The method comprises the steps: dissolving PCS powder, VTES anda Karstedt catalyst in xylene to obtain a xylene solution, and dispersing GO powder in water to obtain an aqueous solution; mixing the xylene solution with the aqueous solution; heating in water bathand stirring with a magnetic stirrer; after reaction, standing, taking an upper-layer liquid, carrying out rotary evaporation and grinding, to obtain precursor PVG powder; carrying out compression molding to obtain a SiC(rGO) biscuit; putting the biscuit into an atmosphere tubular furnace and sintering at high temperature in an argon atmosphere; and cooling along with a furnace to obtain a black 3D-SiC(rGO) ceramic; soaking the black 3D-SiC(rGO) ceramic in a liquid polycarbosilane precursor with relatively small molecular weight, taking out the black 3D-SiC(rGO) ceramic after soaking, airing,carrying out high-temperature cracking in an argon atmosphere, repeating the steps for multiple times to obtain soaked 3D-SiC(rGO) ceramic, and carrying out high-temperature oxidation in air at different temperatures to obtain the healing 3D-SiC(rGO) ceramic.

The invention relates to the field of organic high-molecular chemistry and discloses an N-heterocyclic carbene platinum complex metal carboxylate integrated catalyst and a preparation method thereof. The preparation method includes following steps: (1) carrying out a reaction between alkyl imidazole and halogenated carboxylic acid to obtain a carboxylic acid functionalized imidazolium salt; (2) carrying out a reaction with chlorides of ferrous, copper, zinc, calcium or magnesium to obtain a imidazole-based ionic liquid containing carboxylates containing the ferrous, the copper, the zinc, the calcium or the magnesium; (3) preparing an N-heterocyclic carbene ligand from the ionic liquid under effect of potassium tert-butyl alcohol; and (4) carrying out a reaction with a Karstedt catalyst to prepare the N-heterocyclic carbene platinum complex metal carboxylate integrated catalyst. The catalyst is high in selectivity, is free of generation of platinum black precipitation, is easy to separate and can be recycled.

Disclosed are an efficient anti-poisoning Karstedt catalyst and synthesis and application in hydrosilylation reaction. Certain-proportion trialkylboron and a derivative thereof are added into a classical Karstedt catalyst, backflow is conducted in solvent at certain temperature for certain time, and the Karstedt catalyst with high activity and high anti-poisoning performance is obtained. The efficient anti-poisoning Karstedt catalyst can be applied to additivity liquid liquid silicone rubber, silica gel ink, silane coupling agent synthesis, hydrogen-containing silane, olefin and other hydrosilylation reactions. According to the efficient anti-poisoning Karstedt catalyst and synthesis and application in hydrosilylation reaction, the activity of the classical Karstedt catalyst and the anti-poisoning performance of the Karstedt catalyst under relatively high (halogen, phosphorus, sulfur and the like) concentration are improved greatly, the usage quantity of the catalyst is high (by Pt), and the economy is good. The hydrosilylation efficiency is high, and the reaction condition is mild. The influence on the finished product appearance is low, and the defective rate is low. The efficient anti-poisoning Karstedt catalyst and synthesis and application in the hydrosilylation reaction can be widely applied to organosilicone monomers and organosilicone polymers.

The invention discloses a preparation method of a fluorosilicone non-ionic surfactant. The fluorosilicone non-ionic surfactant PF2F6 is prepared by taking hydrogen-containing silicone oil (PMHS), N-methyl-N-allyl-2-perfluoro-2-methyl-3-oxo-hexanamide (NF2) and allyl polyether (F6) as raw materials and carrying out a hydrosilylation reaction on the raw material in presence of a Karstedt catalyst. Experimental results show that when the ratio of n (PMHS) to n (NF2) to n (F6) is equal to 2 to 0.7 to 1.3, the minimum values of cmc and gamma cmc are respectively 0.13g / L and 22.8mN / m, and the surface properties are the best; when a contact angle is gradually decreased and the ratio of n (PMHS) to n (NF2) to n (F6) is equal to 2 to 0.4 to 1.6, the minimum value of the contact angle is 41.1 degrees, and the wettability is the best.

The invention provides an organic silicon coupling agent and a preparation method thereof. The method is characterized in that a silane group-containing molecule and an alkylene group-containing molecule undergo a hydrosilylation reaction under the catalysis of a highly selective hydrosilylation catalyst to generate the organic silicon coupling agent. The highly selective hydrosilylation catalystutilizes alkene and platinum atoms to form a weak coordination bonds in order to facilitate the activation of the platinum atoms, an organic cage ligand avoids the agglomeration of the platinum atoms,and a spatial three-dimensional structure formed by the complex catalyst can produce a very large steric hindrance, so the selectivity of the hydrosilylation product is greatly improved. The preparation method of the invention is used to prepare the novel coupling agent by a hydrosilylation reaction which cannot be catalyzed by a Karstedt's catalyst.

The invention provides a method for preparing hydrophobic silica by virtue of fumed silica. The method comprises the following steps: performing a reaction between fumed silica and vinyl silicone oilto prepare silicon dioxide containing vinyl; mixing silicon dioxide with a mixture of methyl silicone oil and a Karstedt catalyst; adding tetramethyldisiloxane to react to obtain modified silicon dioxide; and finally, adding alpha-olefin to react, so as to obtain hydrophobic silica. According to the method, the treatment of hydroxy on the surface of fumed silica is relatively thorough; long-chainalkyl is grafted to the surface of fumed silica, so that the grafting rate is high, obtained long-chain alkyl surface-modified silicon dioxide has good hydrophobicity and hydrophobic stability and further has good consistency with organic matters (including materials mainly containing carbon chains).

The invention discloses addition fluorinated silicone rubber nano antifreezing adhesive paint and a preparation method thereof, belongs to the field of organic fluorinated silicon polymer materials, and overcomes the problems of the prior art that the coating curing temperature is high and the anti-icing effect is poor. The addition fluorinated silicone rubber nano antifreezing adhesive paint consists of a component A and a component B, wherein the component A comprises the following ingredients in parts by weight: 100 parts of vinyl-terminated polysiloxane, 30 to 50 parts of vinyl-terminated trifluoropropyl polysiloxane, 20 to 30 parts of nano particles and 20 to 30 parts of solvent; the component comprises the following ingredients in parts by weight: 9 to 12 parts of end hydrogen-containing silicone oil, 9 to 10 parts of end hydrogen-containing fluorine silicone oil, 20 to 30 parts of solvent, 0.0074 to 0.012 part of Karstedt catalyst, 0.05 to 1 part of defoaming agent and 1 to 2 parts of dispersing agent. The preparation method comprises the following steps of (1) uniformly mixing the ingredients according to the weight parts to obtain the component A, ball-milling the component A, and uniformly mixing the ingredients according to the weight parts to obtain the component B; (2) uniformly mixing the component A and the component B, uniformly smearing onto the surface of the workpiece which is coated with silane undercoat, and then curing the workpiece at room temperature. By adopting the paint, the anti-icing effect is good.

A process can prepare a 3-glycidyloxypropylalkoxysilane of formula (I), (R′)O—(CH2)3—Si(OR)3 (I), where R groups are independently a methyl or ethyl group and R′ represents an H2C(O)CHCH2— group. The process includes reacting (i) a functionalized alkene of formula (II), (R′)O—C3H5 (II), where R′ represents an H2C(O)CHCH2— group, with (ii) at least one hydroalkoxysilane of formula (III), HSi(OR)3 (III), where R groups are independently a methyl or ethyl group. The reacting takes place in the presence of (iii) a Karstedt catalyst or a catalyst having hexachloroplatinic acid as a homogeneous catalyst, and (iv) 2-ethylhexanoic acid, isononanoic acid, or both. The process further includes obtaining a product of the reacting.

The invention relates to a silicone rubber product, in particular to addition type silk-screen silica gel and a preparation method thereof. The silica gel comprises a component A and a component B. The component A comprises, by weight, first vinyl silicone oil, reinforcing filler, hexamethyldisilazane, water, second vinyl silicone oil, hydrogen-containing silicone oil, a tackifier and alkynol; and the component B comprises a Karst catalyst and third vinyl silicone oil. The tackifier greatly increases the cohesiveness of a silica gel system, so the silica gel has good cohesiveness to nylon, polyester and other fabrics with smooth and compact surfaces; the reinforcing filler enables the silica gel system to have good fluidity, so the situation that the thixotropy of the silica gel system is reduced due to the addition of the tackifier is avoided, and construction operation is facilitated.

The invention relates to release silicone oil, in particular to solvent-free release silicone oil suitable for a PET (polyethylene terephthalate) film and a preparation method of the solvent-free release silicone oil, and the solvent-free release silicone oil comprises the following components: polyorganosiloxane containing acryloyloxypropyl, vinyl-terminated phenyl silicone oil, alkynol, a cross-linking agent and a Karstedt catalyst. Polyorganosiloxane containing acryloyloxypropyl is used as a main agent of the release silicone oil, so that the adhesive force of the release silicone oil to a PET film can be greatly increased, the prepared release silicone oil has no desilicication phenomenon after being applied and has very light stripping force, and an adhesive layer still has very high adhesive force after being stripped from a release silicone oil coating.

The invention relates to mold silica gel, and in particular, relates to special mold silica gel for simulated ancient building mold-rollover and a preparation method of the mold silica gel. The mold silica gel comprises a component A and a component B. The component A comprises a basic sizing material, vinyl silicone oil, MQ resin and a Karstedt catalyst; the component B comprises hydrogen-containing silicone oil and an inhibitor; and the basic sizing material is prepared by mixing alkoxy vinyl silicone oil, a reinforcing filler and a silazane treating agent. By using the alkoxy vinyl silicone oil, the cross-linking density of a silica gel system is increased, the hardness of a colloid is improved, the silica gel has good mechanical properties by filling the reinforcing filler, and the mold silica gel has a good supporting effect and improves the mold rollover times when ancient building materials are subjected to mold rollover.

The invention relates to a double vulcanization system building sealant and a preparation method thereof, belonging to the technical field of building sealants. The double vulcanization system building sealant of the present invention comprises A component and B component, A component: (a) 500-540 parts of alkoxy-terminated vinyl-containing 107 glue, (b) dimethicone 40-60 parts, (c) 50-70 parts of white oil, (d) 950-1000 parts of calcium carbonate, (e) 2-4 parts of Castel catalyst; B component: (f) alkoxyl containing silicon hydrogen 25-55 parts of base silane crosslinking agent, (g) 28-30 parts of titanium catalyst (h) 3.0-3.4 parts of organosilicon coupling agent. The double vulcanization system building sealant of the present invention not only has fast curing speed, deep-level curing, strong cohesion, but also excellent anti-yellowing performance; the present invention also provides a simple and easy preparation method.

The invention belongs to the technical field of dendrimer-like polymers and particularly relates to a dendrimer-like polymer and a synthetic method and application thereof. The dendrimer-like polymerwith multiple components is prepared by: using 4-(vinylphenyl)-1-butene as a repeat unit to construct an outer chain segment of the polymer herein; using sec-butyllithium to trigger VSt polymerization; subjecting double bonds and dimethylchlorosilane to hydrosilylation under the action of Karstedt's catalyst to generate high-activity grafting sites; subjecting the high-activity grafting sites to coupling reaction with various active anionic chains. In addition, the quantity of the grafting sites may also be controlled by adjusting the polymerization degree of the PVSt chain segment to preparethe dendrimer-like polymer with high grafting density. The dendrimer-like polymer herein has a good application prospect in terms of reducing polymer processing viscosity. In addition, G4-P2VP is dissoluble in trifluoroacetic acid solution; pyridine groups in the molecules have good coordination capacity; the dendrimer-like polymer has a good application prospect in polymer micelles.

The invention discloses a method for preparing polysiloxane aerogel. The preparation method comprises the following steps: carrying out a cross-linking reaction between hydrogen-containing polysiloxane and vinyl polysiloxane in a supercritical fluid in the presence of a catalyst, thereby obtaining the polysiloxane aerogel. The supercritical fluid can be any one of supercritical carbon dioxide fluid, supercritical methane fluid and supercritical nitrogen dioxide fluid, and the catalyst can be a Karstedt's catalyst or chloroplatinic acid. By utilizing a green solvent, a flexible cuttable knittable super-hydrophobic silica aerogel material is prepared in the supercritical fluid by virtue of a simple one-step method; the obtained silica aerogel has high flexibility and ultrahigh hydrophobicity and can perform cutting and knitting, and the application requirements on different shapes, different conditions and different needs are met; and moreover, the production cost is low, the production process is simple and environment-friendly, and industrial production is easily realized.

The invention provides a waterproof mobile phone shell and a preparation method thereof. The waterproof mobile phone shell comprises a shell body. The shell body comprises an upper front shell, a sideshell, a lower front shell, a top shell, a bottom shell, a back shell and a waterproof coating coating the surface and the gap of the shell body. The prepared waterproof coating is prepared from perfluor alkane organic matter, a perfluor alkane solvent, sodium hydroxide or potassium hydroxide and water solution, halohydrocarbon, KARSTEDT catalyst and trimethoxy silane. The water contact angle ofthe obtained waterproof mobile phone shell is larger than or equal to 110 degrees, and the mobile phone shell has the good waterproof performance, oil resistance, wear resistance and acid and alkali resistance. After a mobile phone matched with the mobile phone shell is covered with the mobile phone shell, due to a waterproof experiment, the watertightness is 3 MPa, and no leakage is caused for 3h.

The invention provides an EMC encapsulating silica gel, which is made of the following components in parts by weight: organosiloxane A: 1-10 parts; organosiloxane B: 0.1-1 part; organosiloxane C: 2 parts ~6 parts; Custer catalyst: 0.01~0.1 part; Inhibitor: 0.01~0.08 part; Tackifier: 0.05~0.5 part; The organosiloxane A has the chemical formula shown in formula I: (Me 2 ViSiO 0.5 ) a (MeViSiO) b (PhSiO 1.5 ) c (SiO 2 ) d (OMe) e (OH) f Formula I; wherein 0.01≤a≤0.5; 0≤b≤0.7; 0≤c≤0.9; 0≤d≤0.9, and a+b+c+d=1; and 0.001≤e≤0.1; 0.001≤f≤ 0.1; the organosiloxane B has the chemical formula shown in formula II: (Me 2 ViSiO 0.5 ) m (MePhSiO) n Formula II; wherein 0.01≤m≤5; 1≤n≤50; the organosiloxane C has the chemical formula shown in formula III: (HMe 2 SiO 0.5 ) h (MePhSiO) j Formula III; wherein 0.01≤h≤5; 1≤j≤50. The present invention is in the synthesis containing SiO 2 In the special polysiloxane process of chain link and MeViSiO chain link, hydroxyl group and methoxyl group are reserved by designing and synthesizing to promote the bonding with EMC support and improve the bonding performance of silica gel and EMC support in the present invention.

The present invention relates to release silicone oil, in particular to a solvent-free release silicone oil suitable for PET films and a preparation method thereof. The solvent-free release silicone oil includes the following components: polyorganosiloxane containing acryloyloxypropyl alkanes, vinyl-terminated phenyl silicone oils, acetylenic alcohols, cross-linking agents, castor catalysts. In the present invention, the polyorganosiloxane containing acryloxypropyl group is used as the main agent of the release silicone oil, which can greatly increase the adhesion of the release silicone oil to the PET film, and the prepared release silicone oil has no desiliconization phenomenon after application , has a very light peeling force, and the adhesive layer still has a high adhesion after peeling off the release silicone oil coating.

A process can prepare a 3-glycidyloxypropylalkoxysilane of formula (I), (R′)O—(CH2)3—Si(OR)3 (I), where R groups are independently a methyl or ethyl group and R′ represents an H2C(O)CHCH2— group. The process includes reacting (i) a functionalized alkene of formula (II), (R′)O—C3H5 (II), where R′ represents an H2C(O)CHCH2— group, with (ii) at least one hydroalkoxysilane of formula (III), HSi(OR)3 (III), where R groups are independently a methyl or ethyl group. The reacting takes place in the presence of (iii) a Karstedt catalyst or a catalyst having hexachloroplatinic acid as a homogeneous catalyst, and (iv) 2-ethylhexanoic acid, isononanoic acid, or both. The process further includes obtaining a product of the reacting.

The invention discloses an anti-vulcanization LED package silicone material and a preparation method thereof, and the anti-vulcanization LED package silicone material comprises the following raw materials: hexamethyldisiloxane, octamethylcyclotetrasiloxane, di(dimethylsilane)tetraphenylcyclotetrasiloxane, 1,1,3,3-tetramethyl-1,3-divinyldisiloxane, Karstedt catalyst, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tetramethylthiuram disulfide and low hydrogen silicone oil; the preparation method comprises the following steps: S1, preparation of the raw materials; S2; preparation of a base material; S3, copolymer preparation; S4, copolymer modification and vulcanization. The anti-vulcanization LED package silicone material proposed by the invention has reasonable formula, good anti-vulcanization performance and good stability, and the preparation method is simple in operation, clear in process and reasonable in parameters.

The invention relates to silica gel, in particular to thermal transfer silica gel and a preparation method thereof. The thermal transfer printing silica gel comprises a component A and a component B. The component A comprises a basic sizing material, vinyl silicone oil, MQ resin and a Karst catalyst, and the component B comprises hydrogen-containing silicone oil and an inhibitor. According to the thermal transfer printing silica gel and the preparation method thereof, the adhesion of a silica gel system is improved, the prepared thermal transfer printing silica gel and a hot melt adhesive have good adhesion force, during transfer printing, an intermediate layer is not needed, the hot melt adhesive and the silica gel can be directly bonded, the flowability and thixotropy of a sizing material system are reduced, and construction operation is facilitated.

The invention discloses a preparation method of long-chain alkyl phenyl modified silicone oil, which comprises the following steps: (1) adding a part of Karstedt catalyst to a reaction kettle; (3) drop the hydrogen-containing silicone oil into the reactor to obtain phenyl-modified silicone oil; (4) add the remaining catalyst in the stirring tank in the reactor; (5) add the α-olefin After passing through a filter column containing neutral alumina, it flows into the reactor to obtain long-chain alkyl phenyl modified silicone oil. Using Karstedt's catalyst instead of traditional chloroplatinic acid in isopropanol allows the reaction to proceed with less catalyst. At the same time, the reaction process is controlled by adding catalyst twice to prevent the product from being too dark due to too much catalyst.