40 results about "Poly di methyl siloxane" patented technology

The invention relates to the technical field of cosmetics, and particularly discloses anti-wrinkle cream containing sequoia stem fermentation products and a preparation method of the anti-wrinkle cream. The wrinkle removing cream containing the sequoia stem fermentation product is prepared from the following raw materials in percentage by mass: a material A: glycerol, butanediol, p-hydroxyacetophenone YS028, an ammonium acryloyldimethyl taurate / VP copolymer, p-hydroxyacetophenone YS008 and the balance of water; the material B is prepared from cetostearyl alcohol, an emulsifying agent MONTANOV202, butyrospermum parkii butter, isopropyl myristate, C10-18 fatty acid triglyceride, polydimethylsiloxane, ethylhexyl palmitate and XIAMETERPMX-0345Z Fluid; the material C is prepared from a material D and a material E; the material C is prepared from a sequoia stem fermentation product, Naturalpenet 2020 and SEPIGEL305; the material D is prepared from YONOME SPE II, Alps mountain leucas, ULA-L1004 coated ceramide, anti-wrinkle base peptide, super-oinmetidyl-D2, Chinese prescription hexyl A powder, XYREPIOR, annoine TM, essence and methyl dihydrojasmonate; the material D is prepared from YONOME SPE II, Alps mountain leucas, ULA-L1004 coated ceramide, anti-wrinkle base peptide, super-oinmetidyl-D2, Chinese prescription hexyl A powder, XYREPIOR, annoine TM In addition, the preparation method has the advantage of improving the wrinkle removing effect of the wrinkle removing cream.

The invention discloses snowflake cream with pearly luster and a preparation process of the snowflake cream. The snowflake cream comprises the following raw material components: a phase A: water; butanediol; glycerol; methyl glucitol polyether-20; a polyacrylate cross-linked polymer-6; sodium hyaluronate; potassium hydroxide (90%); 4-hydroxyacetophenone; xanthan gum; phase B: caprylic / capric triglyceride; cetostearyl alcohol; stearic acid; a polydimethylsiloxane; squalane; simmondsia chinensis seed oil; mineral oil; and polyethylene glycol (PEG)-100 stearate. Glyceryl stearate; tocopheryl acetate; isononyl isononanoate; a phase C: 1, 2-hexanediol; carnosine; a centella asiatica extract; collagen; the snowflake cream has the advantages of uniform pearly luster texture and the advantages of traditional snowflake cream.

The invention relates to the field of heat-conducting silicone grease, and discloses low-thermal-resistance heat-conducting silicone grease and a preparation method thereof. The heat-conducting silicone grease with low thermal resistance is prepared from the following raw materials in parts by weight: 100 to 120 parts of silicone oil polymer, 135 to 150 parts of heat-conducting filler, 4 to 6.5 parts of methylcyclosiloxane, 2 to 4 parts of alkyl alkoxy silane and 0.2 to 0.4 part of lubricating additive, the silicone oil polymer is prepared from trimethyl trivinyl cyclotrisiloxane, vinyl terminated polydiphenyl siloxane-polymethylvinyl siloxane block polydimethylsiloxane, trimethylolpropane diallyl ether, hydrogen-containing silicone oil and a platinum catalyst through a reaction. The heat-conducting silicone grease prepared by the invention has relatively good thixotropy, heat conductivity and low-heat-resistance stability, and silicone oil is not easy to separate out in a long-term cold and hot cycle use process.

This invention discloses an anionic hydroxyl silicone oil emulsion and its preparation method, relating to the field of polysiloxane emulsion technology, and belonging to patent classification number C08G77 / 04. The preparation method is as follows: Triethanolamine dodecylbenzenesulfonate salt, tridecyl alcohol polyether, and deionized water are mixed and dissolved, heated, and polydimethylsiloxane alcohol is added under high-speed shearing for homogenization. Water is added and the reaction is maintained at a constant temperature to obtain a basic emulsion. γ-(methacryloyloxy)propyltrimethoxysilane is added dropwise to react and obtain an interface-reinforced emulsion. Acrylamide, N-hydroxymethylacrylamide, etc., are pre-emulsified and then added to the interface-reinforced emulsion with ammonium persulfate under nitrogen protection. Polymerization forms a cross-linked polymer shell. After cooling, tert-butylhydroquinone and disodium ethylenediaminetetraacetate are added to obtain an antioxidant emulsion. Phenoxyethanol and octyl glycol are added to obtain the final emulsion. This method significantly improves the thermal stability of the emulsion through the synergistic effects of composite emulsification, interface reinforcement, shell protection, and antioxidant properties, making it suitable for high-temperature environments.

This invention discloses a fluorine-free waterproofing agent and its preparation method, relating to the field of waterproofing agent technology. The preparation method involves mixing nano-silica with acrylate-terminated polydimethylsiloxane, octadecyl methacrylate, and methacryloxypropyltrimethoxysilane, followed by dropwise addition of azobisisobutyronitrile (AIBN) to obtain an organic-inorganic hybrid prepolymer acetone solution. Polycaprolactone diol, isophorone diisocyanate, and dibutyltin dilaurate react to prepare a polyurethane prepolymer. The mixture is then cooled and reacted with dimethylolpropionic acid and acetone, followed by further cooling, neutralization, and emulsification to obtain an aqueous polyurethane dispersion. This dispersion is then emulsified with the hybrid prepolymer, reacted with methyl methacrylate and hydroxyethyl acrylate, and finally reacted with glycerol polyglycidyl ether to obtain a composite emulsion. An antifoaming agent, leveling agent, and bactericide are added to the composite emulsion to obtain the fluorine-free waterproofing agent. The waterproofing agent of this invention provides durable waterproofing performance after being applied to fabrics.

The invention belongs to the technical field of cosmetics, and discloses a vitamin E emulsion and a preparation method thereof, the vitamin E emulsion comprises the following components by mass: 0.5-2 wt% of vitamin E and derivatives thereof, 10-20 wt% of a stabilizer, 10-20 wt% of a humectant, 3-6 wt% of an emulsifier, 0.3-1 wt% of a thickener, 0.5-1 wt% of a preservative, and the balance of water; wherein the vitamin E and the derivative thereof comprise at least one of vitamin E, tocopheryl acetate, tocopheryl linoleate, tocopheryl nicotinate and tocopheryl phosphate; the stabilizer comprises at least one of petrolatum, polydimethylsiloxane, hydrogenated polyisobutene, caprylic / capric triglyceride and butyrospermum parkii butter. Through the components, the antioxidant activity of vitamin E in the storage and skin retention process of the vitamin E milk can be effectively maintained.

The invention relates to the technical field of cosmetics, and discloses an oil wax composition of a high-water-holding complex stably-loaded water active matter and a preparation method, the oil wax composition of the high-water-holding complex stably-loaded water active matter comprises a high-water-holding complex, an oil wax phase and a water-based active matter phase, the high water holding complex comprises polyglycerol-2 dipolyhydroxystearate, polyglycerol-10 eicosanoic acid ester / tetradecanedioic acid ester, polyglycerol-3 rice bran acid ester, 1%-6% of polyglycerol-6 polyricinoleate, bis-behenyl alcohol / isostearyl alcohol / phytosterol dimer linoleate, dipentaerythritol hexahydroxy stearate / hexastearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate, polyglyceryl tristearate and polyglyceryl tristearate. According to the lip care composition, a water-based active matter phase can be stably borne in a high-load mode, water-based activity is effectively conveyed to the lip surface in the using process, and therefore the moisturizing, repairing and functional care effects of the lip are remarkably improved.

The invention discloses a method for low-temperature rapid catalytic degradation of silicone rubber, and belongs to the technical field of resource utilization of waste silicone rubber. According to the method, trifluoromethanesulfonic acid (HOTf) and metal halide zinc chloride are adopted to construct a concerted catalysis system, so that breakage and cyclization of a siloxane main chain can be realized within 10-20 minutes at the low temperature of 25 DEG C, and a siloxane product with octamethylcyclotetrasiloxane (D4) and cyclopentasiloxane (D5) as main components is generated. Compared with an existing Lewis acid system, the synergistic system still shows remarkably improved degradation rate and higher cyclization selectivity under a low-temperature condition. The method provided by the invention is suitable for linear, cross-linked and filler-containing waste silicone rubber, the process is mild and safe, the operation is convenient, and the obtained siloxane product can be directly used for regeneration and cyclic utilization of an organic silicon material.

This invention discloses a herbal skin-nourishing cream based on bamboo shoot extract as a solvent and its preparation method. The herbal skin-nourishing cream comprises an oil phase: petrolatum, squalane, dioctyl ether, glyceryl stearate, PEG-100 stearate, hydroxypinazone retinate, natural emulsifier, beeswax, tocopherol, cyclopentamethoxysiloxane, and oil-soluble fragrance; ethylhexylglycerin, niacinamide, and 10% citric acid are used to adjust the pH to 6.0-6.3. The aqueous phase comprises: pentylene glycol, panthenol, capryloyl hydroxamic acid, sodium hyaluronate, xanthan gum, dipotassium glycyrrhizate, sodium chloride, phenoxyethanol, p-hydroxyacetophenone, cellulose gum, and disodium EDTA; the balance is bamboo shoot extract. The average particle size of this invention is 1-5 μm, and the viscosity is 5000-8000 mPa·s. It has undergone heat resistance, cold resistance, centrifugal stability tests, and preservative challenges, demonstrating no stratification or deterioration. Human patch tests have proven its suitability for sensitive skin.

The invention belongs to the technical field of modified shield soil recycled coarse aggregates, and particularly relates to a preparation method and application of a modified shield soil recycled coarse aggregate, and the preparation method comprises the following steps: 1) preparing a modification liquid from poly (dimethyl siloxane), bis (3-aminopropyl) terminated, linear novolac epoxy resin, a nano filler and an organic solvent; and 2) dipping the shield soil recycled coarse aggregate in the modification liquid, stirring under an ultrasonic condition, taking out, and drying to obtain the modified shield soil recycled coarse aggregate. The poly (dimethyl siloxane), the bis (3-aminopropyl) end cap, the linear novolac epoxy resin and the nano-filler fully permeate into pores and gaps of the shield soil recycled coarse aggregate, and the nano-filler physically blocks the internal pores, repairs micro-cracks and reduces the water absorption rate; the siloxane chain segment of the amino-terminated silicon oil directionally forms a hydrophobic membrane, and the amino-terminated group and the linear novolac epoxy resin are cross-linked and cured to block moisture invasion; and the linear novolac epoxy resin firmly bonds the fragile part, so that the mechanical property and durability are improved.

The invention provides functional end hydrogen-containing silicone oil with high Si-H activity and a production process of the functional end hydrogen-containing silicone oil. The hydrogen-terminated silicone oil is prepared from the following components: 78 to 85 percent of octamethylcyclotetrasiloxane, 0.15 to 0.45 percent of a metal organic framework loaded diacid catalyst, 4 to 8 percent of an amino functionalized hydrogen-containing end-capping reagent, 2.5 to 6 percent of a polyether-siloxane block regulator, 1 to 3 percent of hexamethyldisiloxane, 1.5 to 4 percent of absolute ethyl alcohol and 0.3 to 0.8 percent of a weakly alkaline adsorbent. According to the invention, the hydrogen-terminated silicone oil is based on octamethylcyclotetrasiloxane, has a stable polydimethylsiloxane main chain skeleton, has a controllable molecular chain length, contains amino groups which can react with carboxyl and epoxy groups, and has wide functions and application scenes; the molecular weight distribution is easy to regulate and control, the polyether-containing chain segment has good hydrophilicity, and the block structure improves the high and low temperature resistance.

The invention belongs to the technical field of silica gel, and particularly relates to an antibacterial silica gel composition, a preparation method thereof and a pillow. A curing reaction is carried out through a Michael addition mechanism without a catalyst, so that the problem of poisoning of an addition type silica gel platinum catalyst caused by an antibacterial agent containing an N element is avoided. The preparation method comprises the following steps: synthesizing an amino-terminated polyimidazolium salt antibacterial agent, poly (dimethyl siloxane)-(methyl aminopropyl siloxane) and acryloyl-terminated poly (dimethyl siloxane), and using the acryloyl-terminated poly (dimethyl siloxane) to replace hydrogen-containing silane as a cross-linking agent; and carrying out a catalyst-free Michael addition reaction with an amino-terminated polyimidazolium salt antibacterial agent and poly (dimethyl siloxane)-(methyl aminopropyl siloxane) to prepare the addition type antibacterial silica gel. Compared with condensed type antibacterial silica gel, the addition type antibacterial silica gel has the advantages of high modulus, high elasticity, high tear strength and high antibacterial effect.

Methodology for sampling and determining the concentration of total volatile methyl siloxanes in gases, applicable to any gaseous phase likely to contain volatile molecules with silicon-oxygen and silicon-carbon bonds resulting from the decomposition of polydimethylsiloxane. The methodology is characterized by a first sampling stage where a gas flow is passed through a sealed sampling system; a second analytical stage carried out in the same sampling system involving a gas / liquid mass transfer process with a chemical reaction where volatile methyl siloxanes are absorbed in the liquid phase and converted to silicon dioxide (SiO2); and a third stage where specific chemical reactions for SiO2 are carried out, producing a color whose intensity is proportional to its concentration in the liquid phase.The concentration of SiO2 is subsequently quantified by spectrophotometry and, through material balances, the resulting concentration of SiO2 can be expressed in terms of milligrams of silicon (Si) per cubic meter of gas, or in terms of milligrams of total volatile methyl siloxanes per cubic meter of gas.

An oil-in-water type emulsion composition which does not exhibit an unnatural opaque feeling when applied to the skin, imparts brightness to the skin, and exhibits good stability, the oil-in-water type emulsion composition comprising (A) (A1) a hydrophobic powder having a refractive index of 1.7 or more, or (A2) a powder obtained by hydrophobizing a hydrophilic powder having a refractive index of 1.7 or more; (B) a cellulose derivative having a hydroxyalkyl group; (C) a polyether-modified silicone of formula (I); (D) a powder-containing oil component; (E) The composition does not contain a powdered oil component, contains the component (A) in an amount of 0.4% by mass or more with respect to the total amount of the composition, and contains the component (B) in an amount of 0.13% by mass or more with respect to the total amount of the composition, and the component (D) contains (i) polydimethylsiloxane, methylphenylpolysiloxane, diphenylsiloxyphenyltrimethylsiloxane, and octyl polymethylsiloxane. (ii) a cyclic silicone; and (iii) an oil component having a molecular weight of 400 or less.

The application provides a kind of organic silicon quaternary ammonium salt catalyst for strengthening CO2 mineralization sequestration and its preparation method and application, belongs to catalyst preparation technical field.The preparation method of the organic silicon quaternary ammonium salt catalyst, including steps: hydrogen-containing polydimethylsiloxane and allyl glycidyl ether are added to organic solvent, under the catalysis of platinum catalyst, carry out silicon hydrogen addition reaction, obtain epoxy group end-capped polysiloxane intermediate;The obtained epoxy group end-capped polysiloxane intermediate is added to alcohol solvent, add binary polyether amine to carry out ammonolysis ring-opening reaction, obtain polyether amine end-capped tertiary amine intermediate;The obtained polyether amine end-capped tertiary amine intermediate is added to polar solvent, add quaternization reagent to carry out reaction, obtain the organic silicon quaternary ammonium salt catalyst for strengthening CO2 mineralization sequestration.The catalyst of the application can accelerate the dissolution of calcium silicate and the mass transfer absorption of CO2, inhibit the formation of SiO2 passivation layer, greatly improve the reaction efficiency and CO2 conversion rate.

The invention relates to the technical field of textile processing, in particular to a tea essential oil textile with an emotion regulation function and a preparation method and application thereof.The tea essential oil textile is prepared from Fenghuang Dancong tea essential oil, lavender essential oil, chamomile essential oil, soft waterborne polyurethane, polydimethylsiloxane, vitamin E, hydroxypropyl methyl cellulose and distilled water; 12 parts of Fenghuang Dancong tea essential oil; the proportion of the lavender essential oil is 5 parts; the proportion of the chamomile essential oil is 3 parts; the proportion of the soft waterborne polyurethane is 40 parts; the proportion of the polydimethylsiloxane is 15 parts; the proportion of vitamin E is 2 parts; the proportion of the hydroxypropyl methyl cellulose is 3 parts; the proportion of distilled water is 20 parts; comprising the following steps: raw material pretreatment, oil phase preparation, water phase preparation, emulsification and mixing, fabric pretreatment, coating and molding, and post-treatment and inspection. Through precise raw material ratio and process, the effects of relieving anxiety, relaxing emotion and the like are achieved, and meanwhile the problems that essential oil is non-uniform in fusion and prone to loss are solved.

The preparation method comprises the following steps: step 1, preparing polydimethylsiloxane, namely PDMS-CTA, of which the end group is an RAFT (reversible addition-fragmentation chain transfer) agent, performing RAFT polymerization induced self-assembly reaction on PDMS-CTA serving as a hydrophobic macromolecular chain transfer agent and a functional monomer in a water-phase medium to obtain a siloxane block-containing polysiloxane dispersion; the polydimethylsiloxane is used as a core layer, and the functional polymer is used as a shell layer; step 2, carrying out quaternization reaction in the dispersion, and converting a tertiary amine group in a polymer shell layer into a quaternary ammonium salt group to obtain a Q-PDMS dispersion with cations on the surface; step 3, carrying out a controllable hydrolytic condensation reaction on the Q-PDMS dispersion, so that an alkoxy silane unit in a shell layer forms a cross-linked structure, and obtaining a cross-linked cationic dispersion; in a water phase, a quaternized and cross-linkable PDMS core-shell dispersion is constructed through RAFT polymerization induced self-assembly reaction, so that the synergistic consideration of controllable surface cation exposure and a lasting low-surface-energy wear-resistant coating function is realized.

The invention discloses alkoxy-terminated polydimethylsiloxane with low volatile matter and a preparation method of the alkoxy-terminated polydimethylsiloxane, and belongs to the technical field of polysiloxane. The preparation method comprises the following steps: firstly, mixing and dehydrating octamethylcyclotetrasiloxane, methyl trifluoropropyl cyclotrisiloxane and modified cyclodextrin, then adding a catalyst I, stirring and reacting, adding a neutralizing agent after the reaction is finished, and removing low-boiling-point substances to obtain a cyclodextrin modified fluorine-containing silicon prepolymer; and under the protection of inert gas, mixing and dehydrating the cyclodextrin modified fluorosilicone-containing prepolymer and octamethylcyclotetrasiloxane, adding a catalyst II, stirring, then adding methyltrimethoxysilane, reacting, decomposing the catalyst after the reaction is finished, and devolatilizing to obtain the low-volatile alkoxy-terminated polydimethylsiloxane. The alkoxy-terminated polydimethylsiloxane provided by the invention has lower volatile matter, and the chemically anchored stable nanostructure of the alkoxy-terminated polydimethylsiloxane can continuously lock small molecules in the product for a long time, so that the risk of secondary volatilization in storage and use is effectively avoided.

The application discloses an adhesive and a preparation method and application thereof. The adhesive comprises the following raw materials: a polyether / polyester diol compound, a polytrifluoropropyl methyl siloxane, a polydimethylsiloxane, a perfluorooctyltrimethoxysilane, an alicyclic isocyanate, a flame retardant, a functional filler, a chain extender, a catalyst and a diluent. The polyether / polyester diol compound comprises a polytetrahydrofuran diol (PTMG) and a polycarbonate diol (PCDL); the flame retardant is a halogen-free flame retardant; the functional filler comprises a silane coupling agent modified boron nitride nanosheet and a modified alumina microsphere; and the modified alumina microsphere is a phosphorylated alumina. The application scheme is designed through multi-component synergistic innovation, and the comprehensive performance of the adhesive is remarkably improved.

The invention relates to a silane modified alcohol amine compound, a formaldehyde-removing silicone sealant capable of being rapidly cured and a preparation method of the formaldehyde-removing silicone sealant. The silane modified alcohol amine compound is obtained by reacting amino silane with an alcohol amine compound. The formaldehyde-removing silicone sealant capable of being rapidly cured comprises the following raw materials: 100 parts of polydimethylsiloxane; 20 to 40 parts of dimethyl silicone oil; 150 to 250 parts of an inorganic filler; 0.5 to 2 parts of a cross-linking agent; according to the invention, 20-35 parts of a silane modified alcohol amine compound is used; and 2-8 parts of a titanate catalyst. The dealcoholized silicone sealant disclosed by the invention has relatively high deep curing speed and mechanical strength, and has a remarkable formaldehyde removal effect, and when the dealcoholized silicone sealant is applied to seam sealing of wooden furniture such as a wooden cabinet and a kitchen cabinet, primary amine groups in a system can be subjected to a Schiff base reaction with formaldehyde released by the wooden furniture, so that the formaldehyde can be removed from the wooden furniture; the deep curing speed and the mechanical strength of the dealcoholized silicone sealant can be further improved while the obvious formaldehyde removal effect is achieved.

The present application provides a hydrophobic and oleophobic agent composition containing a copolymer (A) not containing a structural unit having a siloxane bond, a copolymer (B) containing a structural unit having a siloxane bond, a polyether-modified polydimethylsiloxane, and an aqueous medium; the copolymer (A) contains a structural unit derived from a compound having an ethylenic unsaturated bond and an ester bond and not having a carboxyl group, and a structural unit derived from a compound having an ethylenic unsaturated bond and a carboxyl group, and the copolymer (B) contains a structural unit derived from a compound having an ethylenic unsaturated bond and an ester bond and not having a carboxyl group, a structural unit derived from a compound having an ethylenic unsaturated bond and a carboxyl group, and a structural unit derived from a polydimethylsiloxane having an ethylenic unsaturated bond.

The application discloses a kind of concrete freeze-thaw resistance and carbonation resistance protective layer of sandwich structure and preparation method thereof.The protective layer includes three functional layers: surface layer is silane functionalized fluorine carbon modified poly (dimethylsiloxane) urea resin layer, middle layer is silane functionalized montmorillonite modified poly (dimethylsiloxane) urea resin layer, bottom layer is polyol modified poly (dimethylsiloxane) urea resin layer.The preparation method of the application includes the synthesis of poly (dimethylsiloxane) urea resin, the preparation of functionalized additive, and three-layer protective layer is coated and cured layer by layer.The protective layer structure significantly improves the freeze-thaw resistance and carbonation resistance of concrete, effectively slows down the degradation of concrete mechanical properties, and the application provides a new technical solution for improving the durability of concrete structure, and has wide application prospect.

The invention relates to the technical field of oil-water separation, in particular to a preparation method of oil-water separation magnetic photo-thermal phytic acid modified polyurethane sponge with flame retardance. The technical problems that an existing oil absorption material is inflammable and functions are difficult to consider are solved. According to the preparation method, phytic acid and polydimethylsiloxane are introduced to be subjected to a hydrolytic condensation reaction with tetraethoxysilane, and a siloxane network structure is formed on the surface of the sponge through crosslinking, so that the flame retardance of the sponge is greatly enhanced, and the sponge can not be easily ignited by open fire. The material has super-hydrophobicity, has high adsorption capacity to various oils / organic solvents, is good in selectivity and can be recycled for multiple times. Meanwhile, the modified sponge has good photo-thermal performance, solar energy can be effectively converted into heat energy, the viscosity of crude oil is reduced, the crude oil absorption rate is increased, the crude oil adsorption rate under the illumination condition is at least increased by 210%, and the modified sponge not only realizes unification of flame retardance and efficient oil-water separation, but also integrates magnetic control recovery and photo-thermal auxiliary functions.

The invention discloses a dealcoholization type organic silicon adhesive for an electric kettle and a preparation method of the dealcoholization type organic silicon adhesive. The adhesive provided by the invention comprises the following components in parts by mass: 1000 parts of siloxane-terminated polydimethylsiloxane, 50-250 parts of dimethyl silicone oil, 80-150 parts of a thixotropic agent, 5-15 parts of a water removal agent, 5-10 parts of a coupling agent and 1-5 parts of a catalyst, the coupling agent is selected from at least one of gamma-aminopropyl trimethoxy silane, N-beta-(aminoethyl)-gamma-aminopropyl methyl trimethoxy silane and gamma-glycidyl ether oxypropyl trimethoxy silane; the siloxane-terminated polydimethylsiloxane is prepared by the following steps: firstly, carrying out polymerization reaction on cyclic dimethyl siloxane, vinyl siloxane and a polymerization catalyst; and then carrying out hydrosilylation reaction with hydrogen-containing siloxane and a platinum catalyst. The adhesive provided by the invention can fundamentally and effectively avoid the problem of surface drying performance degradation caused by reversible side reaction during storage, and has relatively short initial surface drying time.

The invention belongs to the technical field of organic silicon materials, and relates to a preparation method of polydimethylsiloxane with one end containing hydrogen and the other end capped by methyl, and a product and application thereof. Aiming at the problems of harsh reaction conditions, tedious process, more byproducts, difficulty in separation and the like when the single-ended hydrogen-containing polysiloxane is prepared by the existing method, the invention discloses a method for preparing the single-ended hydrogen-containing polysiloxane by using a siloxane ring body, trimethylchlorosilane and reactive hydrogen-containing organochlorosilane as raw materials. The single-ended hydrogen-containing silicone oil is prepared by the steps of cation-catalyzed siloxane ring-opening polymerization reaction, hydrolysis reaction and replacement reaction, has the advantages of mild and easily-controlled reaction conditions, few side reactions, no need of further separation and purification and the like, and can be subjected to addition reaction with unsaturated bonds under the catalytic action of organic Pt to prepare the single-ended hydrogen-containing silicone oil. Therefore, various single-active-group-terminated polysiloxanes are prepared, and the method has a wide market application prospect.

The invention relates to the technical field of agricultural pesticide compound application, relates to a bactericide composition and a preparation method thereof, and particularly discloses a bactericide composition, which comprises 10-50 parts of pydiflumetofen; 10 to 50 parts of difenoconazole; 5 to 20 parts of decyl hydroxy propyl sulphobetaine; 1 to 10 parts of polyethylene glycol; 3 to 9 parts of polydimethylsiloxane; 1-5 parts of lactic acid; 1 to 3 parts of sorbitol; and 3-8 parts of other auxiliary agents. Compared with a single-component bactericide, the bactericide composition prepared by the invention has a synergistic interaction effect. In addition, research finds that the bactericide composition improves the retention amount, permeability and rain wash resistance of the pesticide on leaf surfaces. And a theoretical basis is provided for scientific use, reduction and synergism of pesticides.

The invention relates to the field of rubber sealing elements, and discloses a capacitor sealing element of an immersed liquid cooling AI server and a preparation method of the capacitor sealing element. A capacitor sealing member of an immersed liquid-cooled AI server is prepared by pasting and vulcanizing a first substrate and a second substrate, and the first substrate is prepared from butyl rubber, carbon black, a filler, an activator, a lubricant, an anti-aging agent and a vulcanizing agent; the second matrix is prepared from nitrile rubber, carbon black, a filling material, an activating agent, a lubricating agent, an anti-aging agent and a vulcanizing agent; the filler is prepared from organic montmorillonite, nano molybdenum disulfide powder, vinyl dimethyl terminated polymethylphenylsiloxane-polymethylvinylsiloxane block polydimethylsiloxane and tetramethyltetravinylcyclotetrasiloxane, and the filler is prepared from organic montmorillonite, nano molybdenum disulfide powder, vinyl dimethyl terminated polymethylphenylsiloxane-polymethylvinylsiloxane block polydimethylsiloxane and tetramethyltetravinylcyclotetrasiloxane. Through the stacking and vulcanization forming process, the prepared sealing element is applied to capacitor sealing of an immersed liquid cooling AI server, good sealing stability is achieved, and substrate layers are not prone to being separated.

The invention relates to the technical field of modified sponge materials, in particular to super-hydrophobic ZIF-8 modified melamine sponge as well as a preparation method and application thereof. The high chemical stability of silicon dioxide nanoparticles is utilized, a protective layer is deposited on ZIF-8 particles through a sol-gel method, and stable SiO2 ZIF-8 composite nanoparticles of a core-shell structure are formed. Then, the compound is fixed on MS (Murashige and Skoog) by using PDMS (Polydimethylsiloxane) with low surface energy as an adhesive, so as to obtain the super-hydrophobic PDMS (Polydimethylsiloxane)-SiO2 (at) ZIF-8 (at) MS sponge. The prepared super-hydrophobic composite sponge has the advantages of being environmentally friendly, low in cost, easy to manufacture and the like, and the composite sponge becomes an ideal material with wide application prospects in the aspects of oil stain cleaning and water purification.

The application belongs to the technical field of silica gel, and particularly relates to an antibacterial silica gel composition, a preparation method thereof and a pillow. A curing reaction is carried out through a Michael addition mechanism without a catalyst, thereby avoiding the problem that an antibacterial agent containing an N element poisons a platinum gold catalyst of addition type silica gel. An addition type antibacterial silica gel is prepared through a Michael addition reaction of an amino-terminated polyimidazole salt antibacterial agent, poly(dimethylsiloxane)-(methyl aminopropyl siloxane) and acryloyl-terminated poly(dimethylsiloxane) without a catalyst, using acryloyl-terminated poly(dimethylsiloxane) to replace a hydrogen-containing silane as a crosslinking agent, and using the amino-terminated polyimidazole salt antibacterial agent and the poly(dimethylsiloxane)-(methyl aminopropyl siloxane). Compared with condensation type antibacterial silica gel, the addition type antibacterial silica gel has high modulus, high elasticity, high tear strength and high antibacterial effect.