10 results about "Octamethylcyclotetrasiloxane" patented technology

The application discloses a preparation of low-yellowing polyether modified amino silicone oil and a fabric finishing agent containing the same, and relates to amino silicone oil and application thereof. The application uses octamethylcyclotetrasiloxane and 3-piperazinylpropylmethyldimethoxysilane as key raw materials, converts original primary amino groups into secondary amino groups on the basis of traditional amino silicone oil, simultaneously pays attention to control of the molecular mass of the modified amino silicone oil, significantly improves the chemical stability and oxidation resistance of the silicone oil, and secondarily modifies the silicone oil by using allyl epoxy polyether, so that the originally non-hydrophilic amino silicone oil obtains certain hydrophilicity, and the self-emulsifying ability of the silicone oil and the stability of the emulsion are significantly improved. Through the modification, the final silicone oil molecular chain segment can be repeatedly and directionally arranged on the fiber surface in the form of alternating polyether and polysiloxane structure, so that the finishing agent has good hydrophilicity, softness and washability for finishing fabrics.

The present invention provides a method for producing an organopolysiloxane emulsion composition that has a low octamethyltetrasiloxane content, small particle size, and good long-term stability. [Solution] <Step (I)> (A) Organopolysiloxane represented by the following formula (1): 100 parts by mass HO(R 1 2SiO) n H (1)(B) Silane compound represented by the following formula (2): 0.01 to 10 parts by mass R 2 1st Round 1 (3-a) Si(OR 3 ) a (2) A method for producing an organopolysiloxane emulsion composition in which the amount of octamethylcyclotetrasiloxane is 3,000 ppm or less and the particle size of the emulsion is 1 μm or less, by emulsifying a mixture containing (C) surfactant: 1 to 8 parts by mass and (D-1) water: 1 to 10,000 parts by mass, and then emulsion polymerization is carried out at a temperature of less than 40°C in the presence of (E) an acid catalyst.

This invention belongs to the technical field of organosilicon polymer compositions, specifically relating to a silicone gel composition for potting and its application in electronic component encapsulation. It is prepared from vinyl-functionalized methylphenyl silicone oil, inhibitors, crosslinking agents, chain extenders, and a platinum catalyst. Using vinyl-containing siloxanes as vinyl-introducing raw materials, and octamethylcyclotetrasiloxane and phenylcyclotetrasiloxane as basic monomers, a ring-opening polymerization reaction is catalyzed by a catalyst under a protective gas atmosphere. By controlling the gradient heating process, vinyl and phenyl groups are sequentially introduced into the side chains of the molecular chain to obtain an intermediate product. Then, vinyl end-capping is performed to obtain the vinyl-functionalized methylphenyl silicone oil. This invention introduces vinyl functional groups into both the side chains and end groups of the silicone oil, solving the problems of low functionality and insufficient crosslinking density in traditional vinyl-terminated silicone oils. It achieves a three-dimensional dense crosslinking network, significantly improving the heat aging resistance of the silicone gel and meeting the requirements of electronic-grade potting compounds.

The present invention is a silicone acrylic graft copolymer resin emulsion, said silicone acrylic graft copolymer resin emulsion being characterized by comprising a graft copolymer resin of (I) a polyorganosiloxane represented by general formula (1), and (II) an acrylic acid ester monomer and / or a methacrylic acid ester monomer, wherein: when the total mass of the polyorganosiloxane (I) and the acrylic acid ester monomer and / or methacrylic acid ester monomer (II) is represented as 100, the mass ratio (I):(II) therebetween is 60-99:1-40; the content of octamethylcyclotetrasiloxane in the emulsion is not more than 3,000 ppm; and the average particle size is not more than 1 μm. Thus, provided are: a silicone acrylic graft copolymer resin emulsion in which octamethylcyclotetrasiloxane is reduced; a method for producing the same; and a coating composition.

The application belongs to the technical field of asphalt materials, and discloses a high-viscosity non-emulsified tack coat oil as well as a preparation method and application thereof. The high-viscosity non-emulsified tack coat oil comprises, in terms of mass fractions, 100 parts of tack coat asphalt, 40-80 parts of solvent and 3-5 parts of polymerization inhibitor. The tack coat asphalt comprises base asphalt, SBS and RET reactive elastomer terpolymer at a mass ratio of 100:2-4:3-6. The solvent comprises anhydrous tetrahydrofuran, limonene and octamethylcyclotetrasiloxane at a mass ratio of 100:60-100:10-20. The SBS and the RET reactive elastomer terpolymer are used to synergistically modify the base asphalt. The anhydrous tetrahydrofuran and the limonene are used in combination for the modified tack coat asphalt, which has the effect of synergistically increasing the solubility of the tack coat asphalt, so that the obtained tack coat oil has excellent flowability, permeability and high bonding strength and can be quickly dried, thereby reducing the risk of interlayer peeling of the ultra-thin overlay and improving the service life of the ultra-thin overlay.

This invention belongs to the field of coating technology, specifically relating to a durable anti-corrosion coating, its preparation method, and its application in bridge steel structures. In preparing the durable anti-corrosion coating, this invention first reacts magnesium nitrate hexahydrate with ZIF-67 to obtain LDH nanoparticles, and then loads them with a 2-mercaptobenzimidazole corrosion inhibitor to obtain corrosion-inhibiting LDH nanoparticles. Pyrrole and dopamine are then subjected to in-situ oxidative polymerization on the surface of the corrosion-inhibiting LDH nanoparticles to obtain a corrosion-inhibiting active filler. Next, tetramethyldihydrodisiloxane, octamethylcyclotetrasiloxane, and trifluoropropylmethylcyclotrisiloxane are used as monomers to synthesize polysiloxane intermediates, and cerium chloride and allylamine are introduced to obtain an anti-UV polysiloxane curing agent. Finally, epoxy resin, the anti-UV polysiloxane curing agent, and the corrosion-inhibiting active filler are mixed and vacuum degassed to obtain the durable anti-corrosion coating. The coating prepared by this invention exhibits excellent anti-corrosion performance, durability, and mechanical properties.

The application relates to the field of building materials and discloses modified limestone as well as a preparation method and application thereof, the modified limestone is prepared by using octamethylcyclotetrasiloxane, tetraethyl orthosilicate and gamma-methacryloyloxypropyl trimethoxysilane as organosilicon monomers, double bond limestone, isoamyl alcohol polyoxyethylene ether and acrylic monomers performing free radical copolymerization, initiating copolymerization of the double bonds on the limestone surface, the double bonds on the solution three hybrid emulsion microparticles, the isoamyl alcohol polyoxyethylene ether and the acrylic monomers, and firmly fixing the polymer shell layer on the limestone surface through chemical bonding to prepare coated limestone, and then using phosphoric acid, triethanolamine, aluminum hydroxide and the coated limestone as raw materials to prepare the modified limestone, the prepared modified limestone is applied to concrete, excellent compressive strength and durability are given to the concrete, and the concrete has good impermeability and fluidity.

This invention relates to a high-transparency thin-walled flame-retardant polycarbonate modified material, its preparation method, and its application. The materials include: homopolymer polycarbonate resin, silicone copolymer polycarbonate resin, polyphosphonate copolymer polycarbonate resin, potassium perfluorobutyl sulfonate flame retardant, brominated polycarbonate, an octamethylcyclotetrasiloxane / methylphenyl silicone composition flame retardant synergist, antioxidant, and lubricant. The preparation method includes the following steps: mixing the raw materials, then placing them in a twin-screw extruder for cooling and granulation to obtain the high-transparency thin-walled flame-retardant polycarbonate modified material. Compared with the prior art, the transparent flame-retardant polycarbonate modified material provided by this invention has high transparency, low haze, and stable flame-retardant properties even at relatively thin thicknesses.

The application relates to the technical field of defoaming agent preparation, in particular to a high-content organic silicon defoaming agent composition for a high-temperature and high-shear system. The high-content organic silicon defoaming agent composition is prepared by the following steps: firstly, octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane and hydrogen-containing polymethylsiloxane are copolymerized to construct a methylphenyl polysiloxane skeleton; secondly, acetyl-terminated allyl epoxy oxirane / epoxy propane copolyether and allyl glycidyl ether are introduced step by step; then, the obtained product is sequentially reacted with N,N-diethyl-1,3-propanediamine, phenyl isocyanate, diisopropylamine and maleic anhydride to obtain a urea-based / esterified modified polysiloxane; finally, the urea-based / esterified modified polysiloxane is compounded with methylphenyl silicone oil, dimethyl silicone oil, hydrophobic fumed silica and precipitated silica to obtain the high-content organic silicon defoaming agent composition. The obtained defoaming agent has the advantages of instant defoaming, excellent sustained defoaming, strong shear resistance, storage stability and no floating oil in a high-temperature circulating cleaning liquid system, a high-speed sand mill slurry system and the like.

This invention provides a silicone acrylic graft copolymer resin emulsion with reduced octamethylcyclotetrasiloxane content, a method for producing the same, and a coating composition. [Solution] A silicone acrylic graft copolymer resin emulsion, (I) A polyorganosiloxane represented by the following general formula (1), TIFF2026111384000010.tif29140 (II) Acrylate monomers and / or methacrylic acid monomers A silicone acrylic graft copolymer resin emulsion comprising a graft copolymer resin, wherein the mass ratio of the polyorganosiloxane of (I) and the acrylic acid ester monomer and / or methacrylic acid ester monomer of (II) when the total mass is 100 is (I):(II)=60~99:1~40, and the content of octamethylcyclotetrasiloxane in the emulsion is 3,000 ppm or less, and the average particle size is 1 μm or less.