45results about How to "Control degree of aggregation" patented technology

The invention discloses a method of producing medium and mid-high olefines, such as C8, C12, C16 and C20, etc. with ionic liquid as catalyst to catalyze butylene to carry out butylene oligomerization. The method adopts the butylene as raw material; cation of the ionic liquid catalyst comes from hydrohalide of amine with alkyl, and anion of the ionic liquid catalyst is produced by a metallic compound that has one or two metals. In the technique of the invention, volume ratio of catalyst to butylene is low; conversion efficiency of butylene is high; selectivity of oligomerized product is high; distribution of oligomerized product is improved, and the invention has good social and economic benefits.

The invention provides a polyaspartic acid derivative synthetic method. The method comprises the following steps: monosaccharide or disaccharide and monochloro acetic acid are reacted under catalysisof NaOH, and a reactant is subjected to further acidifying and purification to obtain carboxymethyl saccharide; carboxymethyl saccharide and diamine are subjected to dehydration condensation under catalysis of phosphoric acid to obtain glycosyl acetyl diamine; L-aspartic acid and phosphoric acid are respectively added in a kneading reactor for mixing, a mixture is stirred and heated, polymerization is carried out for preset time to obtain polysuccinimide; glycosyl acetyl diamine is added in a reaction vessel of polysuccinimide for a reaction, polysuccinimide is subjected to ring-opening and grafting reaction to obtain a polysuccinimide derivative; the polysuccinimide derivative is added in a hydrolysis kettle, an aqueous solution of alkali is add drop by drop, a hydrolysis reaction is carried out, and a liquid-phase product after hydrolysis is a glycosyl acetyl diamine-grafted modified polyaspartate aqueous solution. The synthetic method is simple and easy to operate, a grafting modification step and a polymerization step are coupled, so that the side-chain grafting rate is increased and the polymericular weight can be regulated and controlled.

The invention provides a preparation method of a polyester amide. According to the method, by optimizing the pre-polymerization and polycondensation reaction conditions, the yellowing of the polyesteramide in the polymerization process is effectively reduced, and the yellow index of the prepared polyester amide is low, so that the polyester amide is suitable for industrialized production and haswide application prospect.

The invention relates to a catalyst for poly-alpha-olefin synthetic oil. The catalyst comprises the following ingredients: a support and active ingredients, wherein the support is a porous inorganic support, and the active ingredients comprise a metal oxide and a Lewis acid type metal salt. The invention further provides a preparation method for the catalyst. The preparation method comprises the steps: dissolving a metal salt of the metal oxide, which serves as a raw material, in deionized water, dipping the support with the obtained metal salt solution, and then, carrying out drying, so as to obtain a metal salt loaded support; roasting the metal salt loaded support in a muffle furnace, so as to obtain a metal oxide loaded catalyst matrix; and then, adding the metal oxide loaded catalyst matrix into an organic solvent containing the Lewis acid type metal salt for loading, thereby obtaining a loaded dual-active-center catalyst.

The invention provides a preparation method of a polyester amide hot melt adhesive. Through optimization of a technical process and regulation and control of reaction parameters such as polymerizationtemperature, pressure, proportioning of reaction raw materials, and the like, the prepared polyester amide hot melt adhesive is low in yellow index, relatively high in peel strength, low in peel strength loss rate after water washing, excellent in performance and wide in application range.

The invention relates to a preparation method of magnetic fluids with polyaniline derivatives wrapping nano magnetic particles. By step-by-step interpenetrating reactions, polyaniline derivatives can form chemical bonds firmly wrapping Fe3O4 nano particles. The method specifically includes: using anthranilic acid to modify the surfaces of the Fe3O4 nano particles, adding aniline monomer for polymerization to form the polyaniline derivatives, inoculating dodecylbenzene sulfonic acid to the surfaces of the Fe3O4/polyaniline derivative composite particles, and allowing the Fe3O4/polyaniline derivative composite particles to be stably scattered in basic carrier liquid due to the alkane parent non-polar features of the dodecylbenzene sulfonic acid so as to obtain the magnetic fluids with polyaniline derivatives wrapping nano Fe3O4 particles. The photoelectric performance of the magnetic fluids can change regularly under the action of a regularly changed magnetic field, so that the photoelectric performance indexes of the magnetic fluids can be adjusted by adjusting the strength of the magnetic field, a novel research branch is developed in researches of magnetic fluids, and signification research and application values are achieved.

The invention relates to thermoplastic polyimide with excellent comprehensive performance and a preparation method and application thereof, belongs to the technical field of polyimide, and solves the problem that good melting manufacturability and high heat resistance of existing thermoplastic polyimide are difficult to achieve at the same time. The thermoplastic polyimide is prepared from the following raw materials: fluorine-containing aromatic dianhydride, m-phenylenediamine, rigid aromatic diamine with a large-volume structure and a non-reactive end-capping reagent. The preparation method comprises the following steps: preparing a polyamide acid solution, preparing a polyimide solution, preparing a polyimide suspension, and carrying out post-treatment to obtain the polyimide powder. The thermoplastic polyimide resin disclosed by the invention can be used as a high-temperature-resistant engineering plastic, composite material matrix resin or a composite material interlayer toughening component, and is applied to the fields of aerospace, automobile manufacturing, power and electric appliances, microelectronics and the like.

The invention discloses a PDCCH self-adaptive transmission method and a device. The method includes that a base station adjusts outer ring factors by detecting users' discontinuous transmission (DTX) information to obtain current outer ring factors; and the base station distributes command control equipment (CCE) resources meeting target block error ratio (BLER) to users' PDCCH. According to the PDCCH self-adaptive transmission method and the device, polymerization degree of the CCE used by the PDCCH is controlled through the detection of users' DTX information by the base station, so that reliability of the PDCCH is improved.

In order to solve the problem, which troubles academic circles for a long time, about how to permanently bond protein molecules to the metal actively and fixe the protein molecules on the metallic surface of any detector or any independent addressing electrode in place at one step, the invention provides a method for preparing a protein chip. The method comprises the following steps of: by adopting an in-situ electrochemical combination synthesis method and independent addressing microelectrode array technique, making an aniline derivative monomer containing bioactive units and anilines in solution copolymerized on an electrode in a mode of active free radical polymerization, generating an electrode coverings which is bioactive and electrically conductive on the electrode in situ at one step, and under bionic conditions, making avidins connected with various proteins tightly bonded with the e electrode coverings to prepare the protein chip. The method has the advantages of laying a foundation for an unmarked analysis method, truly making mass production of protein chips possible, providing the possibility for the automatic production of the protein chips at the operation level forthe first time, along with high reproducibility.

The invention discloses a preparation method of microcrystalline cellulose. The preparation method is characterized by comprising the following steps: (1) preprocessing a chemical pulp board: dispersing a chemical pulp board in water to prepare a paper pulp turbid liquid (0.1-15%), soaking the pulp board for 12 to 72 hours to swell the pulp board, and delivering the pulp board into a reactor to carry out reactions to obtain slurry; (2) carrying out an alkali treatment on the slurry: after the pretreatment, subjecting the obtained slurry to solid-liquid separation, washing the solid slurry by clean water until the solid slurry becomes neutral, and processing the solid slurry by alkali liquor; (3) carrying out an acid treatment on the slurry: after the alkali treatment, washing the slurry by clean water until the slurry becomes neutral, then adding diluted acid (0.5-5 mol/L), and carrying out hydrolysis at a temperature of 65 to 95 DEG C to obtain a mixture containing microcrystalline cellulose; and (4) obtaining microcrystalline cellulose: subjecting the mixture to solid-liquid separation, washing the solids by clean water until the solid becomes neutral, and drying the solids in vacuum to obtain the microcrystalline cellulose.

The invention belongs to the field of fine chemistry, and relates to hydroxy group and epoxide group co-terminated linear polysiloxane preparation technology. The hydroxy group and epoxide group co-terminated linear polysiloxane preparation technology comprises followingsteps: DMC is introduced into a polymerization reaction vessel for heating to 80 to 85 DEG C; at nitrogen gas protection, a catalyst is added for ring-opening polymerization reaction; polymerization reaction is carried out until the viscosity reaches 200000 to 400000cs, and water is introduced into the reaction vessel for end capping degradation, wherein the mass amount of added water accounts for 0.03 to 0.5% of DMC; 1,3-bis(3-glycidoxypropyl)-1,1,3,3-tetramethyldisiloxane is introduced into the reaction vessel for epoxy end capping degradation; after end capping degradation, heating is carried out for catalyst degradation, vacuum removing of low boiling point volatile substances is carried out so as to obtain the hydroxy group and epoxide group co-terminated linear polysiloxane product.

The invention discloses a preparation method of an alpha-olefin polymerization catalyst. The preparation method comprises the following steps: S1, carrier pretreatment: alcoholizing a carrier in cyclohexane with organic alcohol to obtain a carrier alcoholate; S2, active component support: diluting an active component titanium compound by 2-4 times with cyclohexane, and dropwise adding the dilutedtitanium compound to the carrier alcoholate while stirring to obtain a main catalyst; S3, purification of the main catalyst: washing a semi-finished catalyst product with cyclohexane to obtain slurrycontaining the semi-finished catalyst product, and performing vacuum drying to obtain a purified main catalyst; S4, reduction of the main catalyst: reducing the main catalyst with a catalyst promoteras a reducing agent to obtain the finished catalyst product. The invention also discloses the catalyst prepared with the method, an alpha-olefin polymerization method using the catalyst prepared withthe preparation method.

The invention relates to the field of immunodetection, in particular to a composition for antigen detection and a preparation method, and discloses the composition for antigen detection, which realizes high-sensitivity and high-accuracy detection of antigens by utilizing a long-chain activator to amplify the length of an antigen-antibody connecting arm.

The invention discloses a functional additive for liquid silicone rubber. The functional additive is mainly prepared by polymerizing acrylate monomers, vinyl siloxane and other vinyl monomer compoundsaccording to the mass ratio of 80-300: 100-200: 20-120. The functional additive smoothly realizes the purpose of simultaneously modifying the liquid silicone rubber for several times, so that the performance of the organic silicon material is further improved. The preparation method comprises the following steps: mixing vinyl siloxane, an acrylate monomer, a chain transfer agent and a solvent, dropwise adding a chain initiator, other vinyl monomer compounds and a solvent, controlling the temperature to be 40 DEG C and 120 DEG C, making reacting for 2-8 hours to obtain a primary sample, performing extracting, performing distilling under reduced pressure, and removing the solvent, thereby obtaining the functional additive. The method is simple to operate, can smoothly implement industrial application, and can easily and effectively control the molecular structure, polymerization degree and the like of the functional additive.

The invention provides a synthetic method for a glycyl-histidyl-lysine (GHK) grafted polyaspartic acid derivative. The derivative is synthesized by using GHK tripeptide compound and L-aspartic acid asraw materials and phosphoric acid as a catalyst. The synthetic method provided by the invention is simple and easy to operate, and innovatively couples a graft modification step and a polymerizationstep in one reactor to achieve the purposes of simplifying the process steps and regulating and controlling a polymerization degree and a grafting rate; the polyaspartic acid derivative synthesized byusing the GHK as a modifier is used as a polypeptide polymerization multi-functional novel biomedical product, has the characteristics of having a high molecular weight, strong moisturizing propertyand good coordination ability, and being capable of promoting cell growth, anti-wrinkle and environmentally-friendly, and can be used as a moisturizer, anti-wrinkle additive and pharmaceutical carrieror sustained release agent of cosmetics and health-care products; and the method has a green environmentally-friendly production process, and is an economical preparation method for the value-added polyaspartic acid product.