390results about How to "Good defoaming" patented technology

The invention relates to an epoxy resin potting adhesive which consists of component A and component B. By weight portion, the component A consists of 90-130 portions of bisphenol A type epoxy resin, 240-320 portions of filling, 15-25 portions of thinner, 10-25 portions of toughener, 1-2.5 portions of defoamer and 0.8-2 portions of black pigment, and the component B consists of 60-130 portions of estolide and 1-3 portions of imidazole accelerator. The mixing proportion of the component A and the component B is (3-5):1. The invention also provides a preparation method of the epoxy resin potting adhesive. The epoxy resin potting adhesive provided by the invention has low cost and long resting period; after being mixed, the component A and the component B have low viscidity, good wetting quality, good heat resistance, good defoaming performance, good fluidity and long operating time and are solidified between 70 DEG C and 160 DEG C; a product after solidifying has bright surface, good mechanical performance and insulating performance and high glass transition temperature; and the quality of a potting component is stable.

The invention discloses an oxydol etching solution for copper-molybdenum alloy films. The etching solution is free of fluorides, and comprises the following main components in percentage by weight: 1-35% of hydrogen peroxide, 0.05-5% of inorganic acid, 0.1-5% of hydrogen peroxide stabilizer, 0.1-5% of metal chelator, 0.1-5% of etching additive, 0.1-5% of surfactant, 0.1-5% of defoaming agent and the balance of deionized water. The etching solution has the advantages of no environment pollution, mild and controllable reaction, proper cone angle after etching, small CD loss, favorable defoaming property and higher overall performance, and lays foundation for high-precision processing.

The invention discloses a general anorganosilicon antifoaming agent compound and preparation thereof, comprising 20-90% by weight of organic hydrocarbons material, 0.5-10% by weight of main antifoaming material, 1-15% by weight of antifoaming synergist and 1-10% by weight of emulsifying agent. The preparation method is: (1) mixing half of organic hydrocarbons material with main antifoaming material, rising the temperature to 80-120 degree C and keeping for 0.5-3h to make sure the main antifoaming material to be dispersed completely; (2) adding the rest of the organic hydrocarbons material and the antifoaming synergist to said mixture in turns, and keeping the temperature at 60-90 degree C for 0.5-2.0h to make sure to be mixed thoroughly; (3) dropping the temperature below 50 degree C, adding the emulsifying agent and mixing blend even. The anorganosilicon antifoaming agent compound substantially improves the defoaming properties of the antifoaming agent based on adding high molecular antifoaming synergist, has the advantage of good stability, little recruitment and good security, and is used in the process of papermaking and coating, circuit board developing and metal cleaning of the paper industry.

The invention relates to a preparation method of a scratch-resistant polyurethane matt black finish for woodware. The scratch-resistant polyurethane matt black finish comprises a resin paint component A and a curing agent component B in the weight ratio of 1: 0.5, wherein the resin paint component A comprises alkyd resin, extinction powder, a dispersing agent, carbon black paste, a modifying flatting agent, an antifoaming agent, an anti-settling agent and a solvent; and the curing agent component B comprises a TDI-HDI (Toluene Diisocynate-Hexamethylene Diisocyanate) mixed tripolymer or a TDI/TMP (Trimethylolpropane) affixture, an HDI tripolymer and a solvent. The scratch-resistant double-component polyurethane matt black finish for woodware, prepared by the preparation method provided by the invention, brings no precipitate during being stored, is high in solidity, low in viscosity and excellent in leveling property; and the filming can be realized at one time, and the film is thick, free from sagging, and soft, full, fine, smooth, slippery in hand feel, shows alternate kindness with severity, is given the effect of full decoration like a mirror plane, brings a graceful and comfortable feel, and is adapted to modern aesthetic view and widely popular with the market and customers. The scratch-resistant polyurethane matt black finish is widely applied to protective decoration of surfaces of products such as the woodware, metals and plastics.

The invention discloses humidity and ultraviolet dual-cured polyurethane woodware coating and a preparation method thereof. A synthesis method includes synthesizing initial polyurethane polymer I, polyurethane pre-polymer II, polyurethane pre-polymer III, polyurethane acrylate oligomer and ultraviolet cured woodware coating. The humidity and ultraviolet dual-cured polyurethane woodware coating is mainly prepared by aliphatic diisocyanate, dihydric alcohol pre-polymer, polyhydroxy acid, epoxy resin and hydroxy acrylic ester and the like, and by adding auxiliaries such as photoinitiators, flatting agents, defoamers, substrate wetting agents and catalysts, the ultraviolet cured woodware coating is prepared. The ultraviolet cured woodware coating can form films and be cured under irradiation of ultraviolet, also can be cured by humidity in the air within 5 hours at the room temperature, and has the advantages of high solid, NCO (isocyanate) group content and adhesion force, fine resistance to chemical corrosion, high film coating hardness and fine storage stability and the like, can be used for irregular coating surfaces, hone finished UV (ultraviolet) paint and UV colored paint and the like where cannot be irradiated by the ultraviolet.

The invention relates to a solvent-free method for preparing a polyether modified polysiloxane antifoaming agent. The solvent-free method is characterized by comprising the following steps: 1, adding siloxane-oxyalkylene copolymer which is spirally evaporated to remove water to a reaction kettle, then filling nitrogen, and adding an antioxidant BHT (Butylated Hydroxytoluene); 2, adding a platinum catalyst to the reaction kettle, and heating the reaction kettle and stirring, wherein the provided temperature for heating is at 50 to 60 DEG C; 3, adding low-hydro silicone oil and a 4A molecular sieve to the reaction kettle for starting hydrosilylation reaction, and controlling the temperature in the reaction kettle to reach 70 to 110 DEG C, then stirring at constant temperature for 1 to 2 hours; 4, adding hydrochloric acid or sulfuric acid to the reaction system, then stirring to neutralize, and reacting for 1 to 1.5 hours at 85 to 95 DEG C; and 5, spirally evaporating to obtain the reacting product which is the polyether modified polysiloxane after the reaction. The solvent-free method is high in chemical conversion rate; and the prepared polyether modified polysiloxane antifoaming agent is transparent and high in purity, so that the antifoaming performance of the polyether modified polysiloxane antifoaming agent is high.

The present invention relates to a crosslinked network polymer obtained on the basis of an addition reaction of a hydrogen-containing polyorganosiloxane, an organic silicon resin and an unsaturated hydrocarbon, followed by the process of adding a crosslinking agent containing an active group and silicon dioxide; the polymer has an improved defoaming performance, good anti-foaming effect, and is easy to handle and process, and the addition of an emulsifier does not reduce the anti-foaming effect. The polymer has a good anti-foaming performance with no decay, and the polymer formed therefrom can easily be processed.

A method for isolating and purifying nucleic acids with an improved recovery yield is provided. A mixed solution containing the nucleic acids, salts, and an organic solvent is contacted with an adsorption support to cause the nucleic acids to be adsorbed on the support. Then, the nucleic acids are desorbed from the support using an elution buffer. At least one compound containing 2 to 10 carbon atoms as selected from the group consisting of aliphatic ether, aliphatic ester, and aliphatic ketone is used as the organic solvent. The method improves the yield of nucleic acids collection, is easy to implement and less susceptible to contamination.

The invention relates to a gemini organic silicon defoamer. The gemini organic silicon defoamer is of an improved polyether organosilicon diamide sulfonate structure; hydrophilic groups are ethylene oxide, an amido bond and sulfonate; hydrophobic groups are polysiloxane and epoxypropane; through a plurality of hydrophilic groups, the low-temperature defoaming affect is good; through a comb structure, polyether-modified silicone oil can quickly spread on a gas-liquid interface of a foaming system, and locally intrudes to break foam, and the gemini organic silicon defoamer has better defoaming activity; through a macromolecular comb structure, the dissolution rate in a system is reduced and a continuous foam inhibition effect is generated. The gemini organic silicon defoamer is a silicone-modified defoamer which is good in defoaming and foam inhibiting properties, especially good in low-temperature defoaming and foam inhibiting effects.

The invention relates to a method for preparing nonionic surfactant with alkamine modified swill-cooked dirty oil. The method comprises the following steps: firstly refining the reclaimed swill-cooked dirty oil, secondly using alkamine to perform amidation modification, and then performing ethylene oxide or propylene oxide addition of the modified mixture product to prepare the environmentally friendly nonionic surfactant with high cost performance. The product is pale yellow-reddish brown viscous fluid, and the HLB value is 6-15 which is determined by the structure of the product and the adduct number of ethylene oxide or propylene oxide. The nonionic surfactant has good emulsifiability and functions of softening and defoaming, is suitable to be used in fields of leather, textile dyeing and finishing, industrial cleaning, pesticide and daily chemical engineering and has wide application range and good comprehensive performance. The design of the technical route of the invention is novel and unique and has innovativeness. On one side, the additional value of discarded edible oils and fats can be greatly increased, which has great significance in removing the pollution of discarded edible oils and fats; and on the other side, new chemical products can be produced.

The invention discloses a defoaming kettle and a defoaming method for preparing polyamide acid resin. A thin layer distributor with an arch rotary curve surface is fixedly installed in a defoaming kettle tank body; the distance from the curve surface arch top of the thin layer distributor to the lower end opening of a feeding pipe ranges from 0.01mm to 1/3 of the height of the tank body; the clearance between the lower edge of the curve surface of the thin layer distributor and the inner wall of the tank body is 0.01mm-10mm; the rotary curve surface of the thin layer distributor is a spherical surface; a resin conveying pipeline between a reaction kettle and the defoaming kettle is provided with a metering pump; the tank body is provided with a sandwiched sleeve, and an heat conduction medium inlet and outlet are formed at the top and bottom of the tank body. The defoaming method comprises the step that resin entering the defoaming kettle falls on the arch top of the curve surface of the thin layer distributor, and disperses and flows downward along the curve surface of the thin layer distributor to form a thin layer which results in bubble breakage. The metering pump is used for adjusting the flow rate of resin so as to keep that the thickness of the resin solution layer on the thin layer distributor is less than 5mm. Defoaming is completed immediately when resin is conveyed completely, and then pressurization is carried out for discharging. During defoaming, a heat conduction medium is introduced for warming, and negative pressure is kept in the tank body. According to the invention, defoaming is complete, and the defoaming time is shortened greatly so as to guarantee subsequent continuous film preparation. The defoaming kettle is simple in structure and convenient to operate.

The invention relates to the field of lubricating grease, in particular to an environment-friendly steel wire drawing lubricating agent and a production method thereof. The lubricating agent is prepared by blending the following components in percentage by weight: 5.0 to 10 percent of base oil, 15 to 24 percent of emulsifier, 5.0 to 8.0 percent of alkaline reserve agent, 9.4 to 18.8 percent of extreme pressure antiwear agent, 5.3 to 8.3 percent of water soluble antirust agent, 0.01 to 0.03 percent of coupling agent, 0.01 to 0.03 percent of defoaming agent, 0.01 to 0.03 percent of bacteriacideand 30.81 to 60.27 percent of distilled water. The total percentage of the components is 100 percent. Compared with the prior art, the components do not react with the steel wire substrates; the antirust performance, defoaming performance and biostability are high; the deterioration in storage and use is slow, and the service life is long; and environment pollution is avoided and waste liquid canbe treated easily.

The invention discloses an environment-friendly neutral cleaning agent. The environment-friendly neutral cleaning agent comprises, by mass percent, 2%-20% of a surface active agent, 1%-5% of an emulgator, 1%-5% of an auxiliary, 1%-10% of an organic solvent, 0.3%-4.0% of a defoaming agent and the balance deionized water. The surface active agent comprises at least one kind in fatty acid methyl ester ethoxylate and modified grease ethoxylate, at least one kind in alcohol alkoxylate and normal fatty alcohol polyoxyethylene ether, at least one kind in coconutt diethanol amide and laurel based amphiprotic sodium acetate and at least one kind in fatty alcohol glucoside and alkyl glycoside. Raw materials related to in the formula of the cleaning agent contain no phosphorus and are green and environment-friendly, the components are coordinated and cooperate with one another, the excellent properties of wetting, permeation, emulsification and dispersion are achieved, and grease and other dirt on the surfaces of stainless steel workpieces can be removed fast.

The invention discloses a silyl ether composite defoaming agent as well as a preparation method and an application thereof, and belongs to the technical field of oilfield chemical industry. The composite defoaming agent is prepared from components in percentage by mass as follows: 15%-25% of polysiloxane, 15%-25% of polyether, 2%-5% of hydrophobic white carbon black, 2%-5% of a compound emulsifier, 1%-2% of a stabilizer and the balance of water. The preparation method comprises steps as follows: polydimethylsiloxane and polyether are added to a reaction kettle, the temperature is increased to170-200 DEG C, and the materials are continuously stirred for 1-2 h; hydrophobic white carbon black is added and stirred to be homogenized; the compound emulsifier, the stabilizer and water are added,the temperature is reduced to 60-80 DEG C, a stirring reaction is performed at constant temperature, and the silyl ether composite defoaming agent is obtained. The composite defoaming agent is used for defoaming and foam inhibition in a stirring process of well cementing slurry containing an admixture. The composite defoaming agent is high in defoaming and foam inhibition capacity, can be appliedto various cement slurry systems, and is good in compatibility with common admixtures, safe and environmentally friendly.

The invention discloses an aqueous emulsion non-silicon defoamer and a preparation method thereof. The defoamer consists of a material with defoaming activity, an emulsifying material and a dispersion medium, wherein the material with defoaming activity consist of alkynol, higher aliphatic alcohol and glyceryl polyether; the emulsifying material consists of anionic emulsifier and non-ionic emulsifier; and the dispersion medium consists of water and glycol. The defoamer of the invention has excellent defoaming and anti-foaming functions and high wettability and stability and is particular suitable for water-based paint, oil ink and other systems.

The invention discloses UV-moisture dual-curing liquid optical cement. The UV-moisture dual-curing liquid optical cement is prepared from, by weight, 45-80 parts of UV moisture curing matrix resin, 10-50 parts of tackifying resin, 10-35 parts of reactive diluents, 0.3-5 parts of photoinitiator and 1-5 parts of additive. The matrix resin and the tackifying resin have unique molecular structures. The invention further provides a preparation method of the UV-moisture dual-curing liquid optical cement. The preparation method comprises the following steps that the matrix resin and the tackfying resin are prepared; then all the materials are placed in a planetary vacuum mixer and are stirred and mixed to be uniform, and the finished product is obtained through filtering and defoaming. The problem of cement overflow that common liquid optical cement cannot overcome and the problem that the common liquid optical cement is not suitable for the special lamination process of UV precuring, lamination and moisture curing for cement overflow prevention are solved, a cement film formed by the UV-moisture dual-curing liquid optical cement after primary UV curing has moderate bonding strength and a good locating effect, the bonding strength is greatly improved after moisture curing, the surface of the cement film is very smooth, a certain edge shape is kept, no edge collapse phenomenon occurs, and the UV-moisture dual-curing liquid optical cement is suitable for automatic equipment coating.

The invention discloses a preparation method of a novel polyether modified organic silicon defoamer, wherein the method comprises the following steps: S1, preparing double-end and side-chain hydrogen-containing silicone oil by using tetramethyldihydrodisiloxane, octamethylcyclotetrasiloxane and tetramethylcyclotetrasiloxane as raw materials and concentrated sulfuric acid as a catalyst; S2, taking5 parts of the double-end and side-chain hydrogen-containing silicone oil and 1 part of allyl polyether as raw materials, and taking 0.15 part of chloroplatinic acid as a catalyst for grafting to obtain double-end and side-chain polyether modified silicone oil; and S3, mixing the double-end and side-chain polyether modified silicone oil, silicon paste and a compound emulsifier, emulsifying, homogenizing, then adding a thickener, stirring and diluting to obtain the novel polyether modified organic silicon defoamer which is high in foam breaking rate, strong in defoaming capacity, short in defoaming time, resistant to acid and alkali at high temperature, strong in stability and simple in process condition.

A skin cleansing composition contains the following ingredients (A), (B) and (C): (A) a polyoxyethylene alkylether sulfate, (B) a polyoxyethylene alkylether carboxylate, and (C) a cationic group-containing polymer having a cationic charge density of not less than 4.5 meq/g, and/or polyvinylpyrrolidone. A weight ratio (A):(B) of the ingredient (A) to the ingredient (B) is from 85:15 to 25:75. A total content of the ingredients (A) and (B) based on the whole composition ranges from 5 to 25 wt %. A content of the ingredient (C) ranges from 0.05 to 1 wt %. The skin cleansing composition is excellent in foamability and foam quality, and provides a good stop feeling during rinsing and a refreshed touch feeling after towel blotting.

The invention provides a defoaming agent and a synthesis method thereof. The defoaming agent comprises special polyether which comprises first unsaturated enol polyether, second unsaturated enol polyether and unsaturated gemini quaternary ammonium salt. By different combination of EO and PO in gemini polyether and change of the ratio of the unsaturated polyether and unsaturated gemini quaternary ammonium salt, the special polyether which is the main ingredient of the defoaming agent can rapidly permeate into coating, the ratio of EO to PO of block polyether is adjusted to adjust the hydrophile-lyophile ratio of the special polyether, and the defoaming agent is synthesized by a positive and negative charge attracting principle. The defoaming agent has the characteristics that the defoaming effect is good, compatibility of the defoaming agent and the coating is good, and the applicability is wide. Compared with a compound defoaming agent which is compounded by other defoaming agents in markets, the provided defoaming agent is simple in components; the structure is clear and controllable; and the quality and the property are stable.

Modified aminoalkyl- and polyoxyalkylene-functional organopolysiloxanes exhibit delayed antifoaming activity in washing operations, minimizing foaming of rinse water. When applied to a pulverulent carrier, they may also be used in powder detergent formulations.

The invention relates to an organic silicon defoaming agent for a water-based coating material and a preparation method thereof. The preparation method comprises the following steps: (1) synthesizing isomeric alcohol ether terminated allyl polyether; (2) synthesizing end group isomeric alcohol ether terminated polyether modified silicone oil; (3) preparing silicon paste; and (4) preparing the defoaming agent. According to the invention, end group isomeric alcohol ether terminated polyether modified polysiloxane with a symmetrical structure is used, a hydrophilic eo chain segment, a hydrophobic po chain segment and an isomeric macromolecular alkyl alcohol ether group are simultaneously introduced to the end group of a polysiloxane chain, and the hydrophilic and hydrophobic properties of the polymer can be effectively adjusted by controlling the ratio of eo to po, so that better defoaming performance is realized; and the organic silicon defoaming agent disclosed by the invention has the advantages of easily available raw materials, simple process, good stability, capability of effectively eliminating foams of a water-based coating material system, excellent defoaming and foam inhibition performance, difficulty in causing the defects of shrinkage cavities and the like, good wetting performance and capability of saving the use amount of a wetting agent in the water-based coating material.

An alkali-free glass characterized by having a glass composition being substantially free of an alkali metal oxide, As₂O₃ and Sb₂O₃ and including, in terms of mol %, 55 to 75% of SiO₂, 7 to 15% of Al₂O₃, 7 to 12% of B₂O₃, 0 to 3% of MgO, 7 to 12% of CaO, 0 to 5% of SrO, 0 to 2% of BaO, 0 to 5% of ZnO and 0.01 to 1% of SnO₂ and has a liquidus viscosity of 10^5.2 dPa·s or higher and a temperature corresponding to a viscosity of 10^2.5 dPa·s of 1,550° C. or lower.