59results about How to "Low degree of branching" patented technology

The invention relates to a segmented copolymer with a fully-saturated soft segment and a crystallizable hard segment and a preparation method of the segmented copolymer. A segmented copolymer with a fully-saturated polyisobutene segment as the soft segment and a crystallizable polystyrene or polyalkyl substituted styrene segment as the hard segment is synthesized by combining cationic polymerization of isobutene with cationic steric polymerization of styrene or alkyl substituted styrene cations, wherein as the hard segment has the crystallizability, physical crosslinking points are more stable, not only is a self-enhancement role achieved, but also the softening temperature of the segmented copolymer is effectively improved, and the melting point ranges from 150 DEG C to 210 DEG C; and according to the segmented copolymer, the use temperature is improved by 50-110 DEG C, and the heat resistance, the material size stability and the physical and mechanical properties are also improved.

The invention relates to nonyl alcohols with a low degree of branching and derivatives produced using them. In particular the present invention relates to mixture of primary nonyl alcohols in which at least 80% of the alkyl chains are linear and at least 15% of the alkyl chains are branched at the 2-carbon position and its derivatives. The low degree of branching produces derivatives that are more elongated and less bulky that similar derivatives produced with more highly branched alcohols.

The invention provides a polynuclear nickel(II) acenaphthenequinonediimine catalyst for synthesizing branched polyethylene, comprising a main catalyst and a co-catalyst, characterized in that: the main catalyst is formed by loading the polynuclear nickel bromide acenaphthenequinonediimine complexes on the MgCl2/AlRm(OEt)[3-m] carrier formed by aluminium trialkyl modified MgCl2-C2H5OH complexes; the co co-catalyst is the AlEt2Cl and the catalyst for synthesizing branched polyethylene by ethane polymerization is formed by the main catalyst and the co-catalyst, and the mol ratio is that: Ni[(n+1)]L[(n)]Br[2(n+1)]:AlEt[2]Cl is 1:100-1000. The advantages of the invention are that: the prepared catalyst only uses general AlEt[2]Cl as co-catalyst without using expensive MAO or boron compounds, and the catalysis for ethylene polymerization is high active, thus the branched high branching degree and low density polyethylene plastomer and lower density elastomer is prepared; the carrier uses the modified MgCl2-C2H5OH complexes, thus the prepared polyethylene product has good form. The catalyst is suitable for being generalized and used in industrial production with notable advantage.

A molecular sieve comprising a core having deposited thereon a surface layer, wherein the core is a zeolite containing silicon and at least one element selected from gallium and iron and the surface layer has a higher Si:Al ratio than that of the silicon:selected element ratio of the core, provides for lower branching in olefin oligomerization products.

The invention relates to a diimine palladium catalyst with great steric hindrance, and ligand, preparation method and application thereof. The diimine palladium catalyst has a formula as described in the specification, and R1 to R7 and X are as defined in the specification. The catalyst provided by the invention has high thermal stability and activity to vinyl polymerization and enables polyethylene with low branching degree and high molecular weight to be produced. Moreover, the catalyst can be applied to copolymerization of ethylene and methyl acrylate. Polyethylene and ethylene-methyl acrylate copolymer prepared in the aid of the catalyst are hypocrystalline solids.

The invention relates to an energy-containing fragment with nanometer Al/M<x>O<y>/oxidizing agents.The energy-containing fragment comprises, by weight, 10-30% of nanometer aluminum powder, 30-60% of transition metal oxide (the M<x>O<y>), 10-40% of the oxidizing agents, 1-5% of ferrocene, 1-7% of high explosive and 3-8% of mixed binders.The energy-containing fragment has the advantages that the energy-containing fragment is high in energy density and fire setting capacity, good in safety performance and easy to ignite, immediate reaction can be prevented when the energy-containing fragment is driven by explosive, but violent chemical reaction can be carried out in penetration procedures, extremely high-temperature heat can be released, and high-temperature hot reaction products with flowability can be generated.

The invention discloses a flame-retardant bismaleimide resin and a preparation method thereof. The flame-retardant bismaleimide resin is prepared by the following steps: stirring 100 weight parts of bismaleimide, 0-80 weight parts of diallyl phenyl compounds and10-50 weight parts of a halogen-free non-phosphorus silicon-containing flame retardant under the temperature condition of 120-150DEG C to form a transparent liquid. The halogen-free non-phosphorus silicon-containing flame retardant is poly-maleimide hyperbranched silicon resin with the branching degree of 0.5-0.6 and the molecular weight of 2500-3400. The flame-retardant bismaleimide resin not only has excellent flame retardance performance, but also the mechanical performance can be greatly improved, in addition, the flame-retardant bismaleimide resin also maintains the excellent heat resistance, and can be used as a high-performance resin matrix, an adhesive, insulating paint and the like, and has wide application prospects in the fields of aerospace, electronic information, electrical insulation and the like.

The invention relates to a heterogeneous polymerization reaction catalyst and application of the heterogeneous polymerization reaction catalyst to preparing a homopolymer and a copolymer. The heterogeneous polymerization reaction catalyst mainly comprises a supported catalyst promoter A and a catalyst B, the structure of the catalyst B is shown in the formula (I) or the formula (II), R1-R5 are respectively independently chosen from hydrogen, alkyl group, substituendum of the alkyl group, alkoxy group, alkyl sulphanyl, halogen, nitryl, aryl group or substituendum of the aryl group in the formula, the adjacent groups in the R1-R5 form a ring and the number of the formed ring structures is less than 4, R6 is the alkyl group or the aryl group, and L is alkyl group substituted phosphine or allyl. The heterogeneous polymerization reaction catalyst can be used to prepare the homopolymer and the copolymer, the activity is relatively high, the tolerance of the polar functional group is relatively good, the molecular weight of the prepared polymer is relatively large, the distribution of the molecular weight is relatively narrow, the morphology is controllable, no subsequent processing is needed, and the phenomenon of adhesion on a kettle is effectively improved.

The invention relates to a catalyst composition for ethylene gas-phase polymerization or co-polymerization, preparation and applications thereof. The preparation method comprises the following steps: dissolving a titanium compound, an iron compound, and a magnesium compound in tetrahydrofuran so as to obtain a mother liquid; adding a modified silica carrier, which has been subjected to a thermal treatment and a chemical treatment, into the mother liquid, carrying out refluxing for 1 hour under stirring, blow-drying the mother liquid with high-purity nitrogen gas to remove the excess tetrahydrofuran, controlling the residual tetrahydrofuran content to be in a range of 10 to 15 wt% of the total weight of the product, floating the obtain solid in a low-carbon alkane solvent, carrying out a reduction treatment for 30 minutes on the solid at a room temperature by using one or more alkyl aluminum compounds, and then blow-drying the product with high-purity nitrogen gas so as to obtain the catalyst composition. The catalyst has a high catalytic activity when the catalyst is used to catalyze ethylene polymerization especially the gas-phase fluidized bed polymerization; and can prepare polyethylene products with a wide molecular weight distribution or double-peak distribution. The prepared polyethylene product has a high bulk density and little fine powder.

The invention relates to ternary fluorine-containing resin as well as a preparation method and an application thereof. The fluorine-containing resin is a trifluoropropene terpolymer and has a structure shown in formula (I), supercritical carbon dioxide is used as a medium, a perfluoroalkoxy peroxide oligomer is used as an initiator to initiate copolymerization of vinyl acetate and trifluoropropene, and then part of ester groups are hydrolyzed. A fluorine-containing hollow fiber membrane with the lasting hydrophilic property is prepared by general hollow fiber membrane preparation equipment with a dry-wet method to be used as a water separation membrane, the hydrophilic property of the separation membrane is improved greatly, the adsorption to substances such as protein and the like in the separation process is reduced, and the anti-pollution capacity of the membrane is improved.

The invention discloses a method for separating and purifying straight-chain hemicellulose and branched-chain hemicellulose from biomass. According to the invention, lignin in the biomass is removed by using sodium chlorite; extractions are carried out by using 0.25M, 0.5M and 1.0M alkali solutions at 15 DEG C to 40 DEG C; and three alkali-soluble hemicellulose are subjected to graded purification by using an I2-KI solution. As a result of researches, agricultural and forestry biomass hemicellulose can form precipitate in the I2-KI solution. With the I2-KI solution, the precipitated hemicellulose component has low branching degree, and the hemicellulose component that is retained in the solution and is then precipitated by using ethanol has high branching degree. The straight-chain hemicellulose and branched-chain hemicellulose separating and purifying method provided by the invention has the advantages of simple technology and easy industrialization. With the graded purification process, straight-chain hemicellulose and branched-chain hemicellulose can be separated, such that hemicellulose with different structural properties can be obtained. Therefore, an application basis is provided for the industrialization of hemicellulose.

Environmentally friendly soluble ink and a preparing process thereof are disclosed. Raw materials of the ink include, by weight, 55-75 parts of modified acrylic resin, 40-55 parts of environmentally friendly pigment filler, 70-95 parts of n-butanol, 55-75 parts of absolute alcohol, 15-25 parts of a dispersant, 15-20 parts of a thickener, 35-50 parts of hyperbranched polyglycerol and 5-15 parts ofpolyoxypropylene glycerol ether. In a preparation process, the n-butanol is adopted as a solvent, the modified acrylic resin reacts with the hyperbranched polyglycerol to form glycidyl methacrylate which has carbon-carbon double bonds in acrylic resin and epoxy groups, and the epoxy groups react with hydroxyl on the surface of the polyoxypropylene glycerol ether so as to increase the number of branch chains in the glycidyl methacrylate, and therefore, the glycidyl methacrylate is improved in polarity and can form hydrogen bonds with water molecules, and dissolving performance of the ink can befurther improved.

The invention discloses a synthetic method of lubricating oil base oil. The method comprises the following steps: simultaneously adding high-carbon olefin and ethylene into a high-pressure white steelpolymerization reaction kettle, adding a Ziegler-Natta catalyst into the reaction kettle, starting a reaction, and controlling conditions in a polymerization process; after the reaction is finished,pressing the material into a second reaction kettle through nitrogen (or cooling to room temperature in the same reaction kettle) while adding an AlCl3 catalyst into the material, and controlling theadding amount of the catalyst and the polymerization reaction conditions; and after the reaction is finished, emptying and depressurizing the reaction kettle, removing the residual catalyst from the obtained crude product through an alkali washing process, removing the unreacted high-carbon olefin through pressure reducing distillation, and carrying out structural characterization determination onthe product obtained after hydrogenation to determine branching degree, and carrying out performance test to determine indexes such as viscosity, viscosity index, pour point and the like of the product. According to the present invention, a complex raw material high-carbon olefin is adopted as a raw material, and the synthesized poly-alpha-olefin lubricating oil base oil has excellent viscosity-temperature performance and excellent low-temperature performance.

The invention relates to the field of degradable high polymer materials, and particularly discloses thermoplastic starch and a preparation method thereof. The thermoplastic starch comprises the following components in parts by weight: 30-50 parts of corn starch, 30-50 parts of cassava starch, 20-30 parts of modified cassava residues, 8-10 parts of a plasticizer and 0.2-0.4 part of a lubricant, wherein the modified manioc residue is prepared by performing alkali gelatinization, dispersion and homogenization treatment on manioc waste and performing modification treatment on the manioc waste by acetic anhydride and a silane coupling agent. The cassava starch and the corn starch are used as matrixes, and the modified fibers and the modified starch which are prepared from the cassava residues are added, so that resources can be recycled, the cost is reduced, and the heat resistance and the water resistance of the thermoplastic starch can be improved; moreover, the cassava residues are modified, so that the dispersity of the cassava residues in starch can be improved, the mixing uniformity of the raw materials is improved, and the processability of the cassava residues is improved.

The invention provides water-based alkyd resin and a preparation method thereof. The water-based alkyd resin is prepared by taking vegetable oleic acid, polyhydric alcohols except glyceryl monomethylether, glyceryl monomethyl ether and polybasic acid or anhydride as reaction raw materials and taking a water-carrying agent as a reflux solvent through multi-step reactions. The water-based alkyd resin has improved water resistance and adhesive force, and the method realizes the reuse of glycerol and improves the utilization value of glycerol.

The invention relates to spinnable polycarbosilane and a preparation method thereof. The method comprises the following steps: under nitrogen protection, adding an organic solvent and alkali metal into mixing equipment for mixing, heating the mixture until the alkali metal is molten, then adding dimethyldichlorosilane into the molten alkali metal for a reaction, and carrying out stirring and curing at a high temperature to obtain a reactant; separately adding purified water and absolute ethyl alcohol into the obtained mixture, and cleaning the mixture multiple times so as to obtain pure polydimethylsilane; conducting reacting for 1-6 hours at a temperature of 100-150 DEG C, and carrying out condensation polymerization to obtain polydimethylsilane to be treated; and carrying out pressure maintaining, vacuumizing, heat preservation, heating and cracking on the vacuum-dried polydimethylsilane to obtain a liquid low-molecular cracking product. According to the invention, excellent flowability is obtained, the branching degree of polycarbosilane is reduced, the product has a better linear structure, flowability is high, and spinnability is also obviously improved.

The invention discloses a polyether de-emulsifier and a W/O-type crude oil emulsion demulsification dehydration method using the same. A preparation method of the polyether de-emulsifier comprises that 1, an amino group-terminated polyamide-amine type molecule is grafted to an ester group-terminated polyamide-amine type molecule, wherein a mole ratio of the amino group-terminated polyamide-amine type molecule to the ester group-terminated polyamide-amine type molecule is 3-50: 1 and the amino group-terminated polyamide-amine type molecule and the ester group-terminated polyamide-amine type molecule belong to generation of less than 3.0, and 2, the product obtained by the step 1 and an epoxy compound undergo a reaction. The preparation method of the polyether de-emulsifier has simple synthesis processes and can be easily industrialized. The polyether de-emulsifier has a high branch structure. The test result in the embodiment shows that the polyether de-emulsifier has excellent demulsification effects.

The invention relates to the technical field of coatings, and provides a real stone paint primer emulsion with good tear resistance and alkali resistance, the raw materials comprise a core layer raw material, a shell layer raw material and a priming raw material, the core layer raw material comprises the following components by weight: 20-40 parts of water for a core layer monomer emulsion, 0.5-4 parts of a core emulsifier, 0.5-3 parts of a core initiator, and 5-6 parts of water for the core initiator; the component A comprises, by weight, 20-50 parts of styrene, 15-35 parts of butyl acrylate, 0.5-3 parts of acrylic acid, 0-0.5 part of acrylamide and 0.5-2 parts of a chain transfer agent; the shell layer raw material is prepared from the following components in parts by weight: 25 to 35 parts of water for a shell layer monomer emulsion, 1 to 3 parts of a shell emulsifier, 0.7 to 4 parts of an oxidant, 4 to 5 parts of water for the oxidant, 1 to 3 parts of a reducing agent, 15 to 20 parts of water for the reducing agent, 10 to 40 parts of styrene, 5 to 10 parts of methyl methacrylate, 25 to 45 parts of butyl acrylate, 1 to 4 parts of methacrylic acid, 0 to 0.5 part of acrylamide and 0.5 to 3 parts of a polyfunctional group cross-linking agent. According to the technical scheme, the problems of poor tear resistance and alkali resistance of the primer emulsion for the real stone paint coating in the prior art are solved.

A process for isomerizing a saturated, branched and cyclic hydrocarbon, in which a tertiary carbon atom of the hydrocarbon is converted to a secondary carbon atom in the course of isomerization, by performing the isomerization in the presence of a superacidic ionic liquid comprising an organic cation and an inorganic anion, where the anion is a superacidic aluminum trichloride-Lewis base adduct, and of a copper(II) compound.

The invention discloses high-protein-content compound flour. The high-protein-content compound flour is prepared from the following raw materials in parts by weight: 150-200 parts of wheat, 25-50 parts of soybean protein, 30-50 parts of walnut protein, 5-15 parts of cocoa powder, 50-70 parts of red dates, 15-30 parts of red beans, 5-15 parts of butter, and 3-5 parts of a conditioner. The inventionfurther discloses a preparation method of the high-protein-content compound flour. The preparation method of the high-protein-content compound flour comprises the following steps: mixing wheat flourground by a wheat grinding apparatus with the conditioner, the soybean protein and the like; and the grinding process is free of other processing treatments such as heating and the like, so that, nutrients, including protein, carbohydrate and the like, in the wheat can be relatively well preserved. The conditioner comprises modified corn starch granules which are porous, smoother in granule morphology, reduced in particle size and relatively uniformly distributed. Thus, the finally prepared high-protein-content compound flour has stronger gluten network; so that, dough prepared by using the flour is tougher and improved in mouth feel.

The invention belongs to the field of special coatings and discloses a high water-boiling-resistant heat transfer printing coating for a ceramic and glass cup. The high water-boiling-resistant heat transfer printing coating is obtained by reacting the following components in part by weight: 10-18 parts of neopentyl glycol, 4-8 parts of trimethylolpropane, 2-5 parts of isophthalic acid-5-sodium sulfonate, 11-16 parts of hexahydrophthalic anhydride, 6-11 parts of adipic acid, 29-35 parts of deionized water, 0.05-0. 3 part of organotin catalyst, 4-10 parts of carboxyl-terminated acrylic acid prepolymer, 0.5-1 part of adhesive agent and an appropriate amount of deionized water. The high water-boiling-resistant heat transfer printing coating disclosed by the invention has the advantages of fastcuring, good water resistance, scratch resistance and high-definition heat transfer printing.