185results about How to "Prevent gel" patented technology

This invention relates to novel compositions comprising regioselectively substituted cellulose esters. One aspect of the invention relates to processes for preparing regioselectively substituted cellulose esters from cellulose dissolved in ionic liquids. Another aspect of the invention relates to the utility of regioselectively substituted cellulose esters in applications such as protective and compensation films for liquid crystalline displays.

Processes for recycling an ionic liquid comprising employing an initial ionic liquid as a solvent and/or reagent resulting in a modified ionic liquid and thereafter subjecting at least a portion of the modified ionic liquid to at least one anion exchange process to produce a reformed ionic liquid. The initial ionic liquid can be employed in a cellulose esterification process, thereby producing the modified ionic liquid. At least a portion of the reformed ionic liquid can be recycled to a point upstream in the cellulose esterification process.

Ionic liquids and cellulose ester compositions and processes and apparatus for producing ionic liquids and cellulose esters. Cellulose esters can be produced by dissolving cellulose in carboxylated ionic liquids and thereafter contacting the cellulose solution with at least one acylating reagent. Cellulose esters produced via the present invention can comprise ester groups that originate from the carboxylated ionic liquid and/or the acylating reagent.

The present invention is directed to a process for preparing a food product having a casing, the process comprising the step of applying a casing paste comprising alginate and a sparingly soluble calcium salt by co-extrusion to the exterior of a material to be cased to form a co-extruded product, and contacting the co-extruded product with a solution comprising calcium ions, thereby causing the alginate to gel.

The invention provides a preparation method of cubic ultra-fine calcium carbonate particles. The method comprises the following steps: (1) adding a nucleation promoter to calcium hydroxide suspension liquid, wherein the nucleation promoter is selected from more than one of glucose, sucrose or sodium citrate; (2) carbonizing by introducing carbon dioxide until the pH value is 8-12, adding a crystal modifier and ageing for 0.5-10 hours, wherein the crystal modifier is selected from one of sodium chloride, sodium carbonate, sodium bicarbonate or sodium hydroxide; (3) further introducing carbon dioxide and carbonizing until the pH value is 6.5-7.0; (4) coating by adding a coating agent, filtering and drying to obtain a product, wherein the coating agent is selected from a resin acid, a resin acid alkali metal salt, a fatty acid or a fatty acid alkali metal salt. According to the calcium carbonate particles, the particle sizes are 90-180nm, the calcium carbonate particles are in a cubic shape, and the specific surface area is 10-18m<2>/g. Thus, the cubic ultra-fine calcium carbonate particles can be used as functional fillers in coating, rubber, plastic and sealant industries.

The invention discloses a preparation method of instant oat flour and relates to a preparation method of oat flour. The preparation method comprises the following steps: baking, cleaning, soaking, steaming and cooling oats, serving as raw materials, sequentially; glue milling the oats after pretreatment to prepare oat pulp, carrying out enzymatic hydrolysis, heating, boiling, and killing enzyme; and cooling an enzymolysis liquid, glue milling, homogenizing, drying, sterilizing and packaging a finished product. According to the preparation method disclosed by the invention, with the oats as the raw materials, by virtue of pretreatment, enzymatic hydrolysis technological treatment and spray drying, the instant oat flour which can keep multiple nutritional components and fragrance of oat is prepared; the prepared instant oat flour is moderate in taste, has self flavor of oat, keeps the soluble nutritional components in the oats, is also capable of providing extra plant proteins, fats and soluble dietary fibers and can be directly used for preparing an oat beverage; as macromolecular substances including starch, cellulose and proteins in the oats are hydrolyzed by virtue of an enzyme method, the viscosity of the starch of the oats is lowered, and the problems of water separating, gelation, precipitation and the like caused when the oats are applied to beverages are solved.

The present invention is directed to a method for making fused silica glass. A liquid, preferably halide-free, silicon-containing compound capable of being converted by thermal oxidative decomposition to SiO2 is provided and introduced directly into the flame of a combustion burner, thereby forming finely divided amorphous soot. The amorphous soot is deposited on a receptor surface where, either substantially simultaneously with or subsequently to its deposition, the soot is consolidated into a body of fused silica glass. The invention further relates to an apparatus for forming fused silica from liquid, preferably halide-free, silicon-containing reactants which includes: a combustion burner which, in operation, generates a flame; an injector for supplying a liquid silicon-containing compound to the flame to convert the compound by thermal oxidative decomposition to a finely divided amorphous soot; and a receptor surface on which the soot is deposited.

A method of recycling an abrasive slurry for recycling a slurry that: contains colloidal silica; and has been used in polishing semiconductor wafer(s) is provided. The method includes: adding a dispersant to the used slurry having been collected so as to prevent the used slurry from being gelled; irradiating ultrasound to the used slurry having been added with the dispersant so as to disperse a gelled portion and aggregated silica in the used slurry; and, by using a filter, removing a foreign substance contained in the used slurry having been irradiated with the ultrasound.

The invention relates to the use of gelatin-like proteins, or polypeptides, with an increased calculated glass transition temperature as stabilisers in lyophilized biological or pharmaceutical compositions.

Compositions Including Relatively Low Reactivity Acids, Mixed with viscoelastic surfactants (VESs) and internal breakers may serve as drill-in fluids to open underground hydrocarbon reservoirs with carbonate contents of 10 wt % or above. The drill-in fluids have low viscosities in the drilling pipe. After the fluid flows out of the drill bit, the acids react with carbonates in the formation thereby increasing the pH of the drill-in fluids causing the VES to gel the fluid at the bottom of the hole and the downhole annulus between the drilling pipe and the formation rock. The viscosified drill-in fluid will reduce fluid loss and will carry no dissolved drilling debris to the surface. After drilling through the targeted formation, the internal breakers in the viscosified drill-in fluids will break down the fluids to permit their removal, and the well is ready to produce with very little or no near well bore damage.

The invention discloses an engine EGR (Exhaust Gas Recirculation) system, comprising an EGR cooler, an EGR valve, a by-pass line and a temperature sensor, wherein the EGR valve is communicated with the gas outlet end of the EGR cooler; the by-pass line is connected with the EGR cooler in parallel; an exhaust gas flow control proportional valve which is connected with an ECU (Engine Control Unit) in a controlling way is mounted at the inlet of the by-pass line; the temperature sensor is arranged between the outlet of the by-pass line and the EGR valve and is taken as an input end used for collecting the valve inlet exhaust gas temperature of the EGR valve by the ECU. The engine EGR system is simple in structure; the by-pass line which is connected with the EGR cooler in parallel and is provided with the proportional valve is adopted; the temperature of the valve inlet exhaust gas entering the EGR valve is adjusted by adjusting the opening proportion of the proportional valve; the EGR valve inlet exhaust gas temperature is controllable under all operating working conditions of an engine; the EGR system is free of carbon deposition and gum deposit; therefore the temperature of the mixed gas entering an engine cylinder can be well controlled; the optimal states of engine performance and discharge are realized; the cooling efficiency of the EGR cooler is monitored in real time, so that the reliability of a product is ensured.

The invention discloses a targeted domain-control grouting device which comprises a mold-bag grouting pipe, a cement-based slurry grouting pipe and a control-liquid grouting pipe. The mold-bag grouting pipe, the cement-based slurry grouting pipe and the control liquid grouting pipe are fixed and respectively penetrate an orifice fastening and sealing unit. At least one mold bag externally sleeving the mold-bag grouting pipe is arranged on the same, a plurality of grout vents for adhering aluminum sheets are formed in the pipe wall of each mold-bag grouting pipe inside the mold bags, and when number of the mold bags is larger than one, spacing is formed among the mold bags, and spacing sections just correspond to key grouting parts of the grout vents; the cemented-based slurry grouting pipe and the tail end of the control-liquid grouting pipe are communicated to a mixer, a slurry-outlet short pipe is connected on the mixer, the slurry outlet of the slurry-outlet short pipe corresponds to the key grouting parts in the grout vent. The invention further discloses a grouting process utilizing the targeted domain-control grouting device. By the arrangement, targeted domain-control grouting on the key grouting parts is realized, mobility of double-liquid slurry initially grouted to stratum is guaranteed by mixing double liquid in the holes, the slurry can be sufficiently grouted in the key grouting parts, and overall effect of grouting engineering is improved.

Process for preparing crosslinked pressure ensitive adhesives, in which a plyacrylate is prepared by the free radical copolymericzation of a monomer mixture , the polyacrylate is then concentrated and the concentrated polyacrylate is reacted with further monomers having functional groups and subsequently crosslinking.

A method for controlling the level degree on the ULSI multi-layer wiring in chamico-mechanical polishing includes such steps as diluting SiO2 hydrosol by deionized water, adding metal ion chelating agent to regulate pH=10-13, adding alcohol-ether kind of surfactant and oxidant while stirring to obtain polishing liquid, and polishing at 20-40 deg.C and 60-120 rpm under 100-250 g/sq.cm.

The invention relates to a preparation method of a cefotaxime sodium crystal. The preparation method comprises the following steps of: dissolving sodium acetate in a mixed solvent of organic solvent and water below 10-40 DEG C, wherein the volume fraction of organic solvent in the mixed solvent is 30-70%; adding cefotaxime acid, and stirring until the cefotaxime acid reacts in the solution; adding a cefotaxime sodium crystal in the solution, then adding elution agents with a feeding time of 2-8 hours, cooling to 5 DEG C below zero to 5 DEG C; and filtering, washing and drying a crystal slurry to obtain the cefotaxime sodium crystal. By the preparation method, the phenomenon of gelatinization frequently seen in the crystallization process of the cefotaxime sodium crystal is avoided, the size distribution of the products is centralized and the major particle size is adjustable from 5mu m to 60my m, the liquidity of the product is good, the process yield is higher than 87%, and the product purity is higher than 95.5%.

The invention discloses a modified urethane acrylate copolymer. The modified urethane acrylate copolymer is prepared from 16.1 to 50.9 parts by mass of polyisocyanate, 15.4 to 40.2 parts by weight of polyether polyol, 0. 01 to 0.09 parts by weight of a catalyst, 3.1 to 11.6 parts by weight of carboxylated diol, 5.3 to 20.8 parts by weight of epoxy resin, 0.1 to 0.5 parts by weight of a polymerization inhibitor, 10.7 to 35.5 parts by weight of hydroxyl group-containing acrylate, and 10 to 80 parts by weight of a solvent. The polyisocyanate is a mixture of one or more of hexamethylene diisocyanate, tolylene diisocyanate, 1, 6-hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and polymethylene polyphenyl polyisocyanate. The modified urethane acrylate copolymer has the advantages of simple operation and short production period. The modified urethane acrylate copolymer has the advantages of adjustable acid value, good heat resistance, strong corrosion resistance, good adhesion to the substrate and stable performance. The prepared photoresist has good comprehensive performances and is easy to promote and use.

A fast disintegrating controlled release oral composition comprising a core material containing cefuroxime axetil present as controlled release form, the cefuroxime axetil being provided with an outer coating of a copolymer selected from aqueous dispersions of enteric methacrylic acid and methacrylic acid esters anionic copolymers having carboxyl group as the functional group or mixtures thereof and an inner coating of a sustained-release copolymer selected from aqueous dispersions of acrylate and methacrylate pH independent copolymers having quaternary ammonium group as a functional group or mixtures thereof, and optionally probenecid. Additionally, the coating composition may contain plasticizers. The composition is suitable for once daily administration.

The invention discloses a preparation method of POE (polyolefin elastomer) chemically-grafted maleic anhydride. The preparation method of the POE chemically-grafted maleic anhydride comprises the following steps: S1. compounding POE, maleic anhydride, peroxide initiators as well as heat stabilizers, adding an acetone solvent, and mixing evenly; S2, evenly stirring the materials in a high-speed stirrer so as to enable each component to be dispersed evenly and enable the solvent to be volatilized sufficiently, feeding the materials, setting the extrusion temperature of a single-screw extruder as 80-250 DEG C and the main engine frequency of the single-screw extruder as 25-50Hz, controlling the vacuum pressure of the single-screw extruder to be 0.06-0.1MPa, carrying out chemical grafting reaction for 2-4 minutes, staying, cooling, dicing grains, stirring and packaging. The preparation method of the POE chemically-grafted maleic anhydride, which is provided by the invention, can be used for solving defects in production of the POE chemically-grafted maleic anhydride and problems of a POE chemically-grafted maleic anhydride product in the prior art, and greatly improving the compatibility of POE and polar polymers.