110results about How to "High degree of branching" patented technology

The present invention relates to a novel process of preparing branched polymers by cyclotrimerization and branched organic materials containing triaroylbenzene moieties as base structural unit. The polymerization is a simple one-pot reaction, strictly regioselective and highly functionality-tolerant giving oligomeric and polymeric polymers with high degree of branching (up to 100%) in high yields (up to 99%). The polymers are processible, easily film-forming, transformable (curable) into thermosets by heat or irradiation, and readily crosslinkable by UV irradiation to give patterns with nanometer resolution. The polymers of the present invention can be blend with a variety of macromolecules for general use. The polymers can be metallified utilizing organometallic acetylene as building blocks and ceramization of the patterns of the obtained polymers afford ferromagnetic ceramic patterns with high resolution.

The present invention provides a method for preparing a water soluble polymer, which comprises: a first step of polymerizing: (a) 60 to 99.5 mol % of at least one selected from acrylamide and methacrylamide, (b) 0.5 to 20 mol % of at least one selected from α,β-unsaturated monocarboxylic acid, α,β-unsaturated dicarboxylic acid and salts thereof, and (c) 1 to 20 mol % of at least one selected from a water soluble cationic monomer and a salt thereof, (d) 0.01 to 1 mol % of a chain transfer agent, and (e) 0.005 to 5 mol % of a crosslinkable monomer, in the presence of a persulfate-based catalyst to obtain a prepolymer; and a second step of further adding the persulfate-based catalyst to the prepolymer obtained in the first step and the residual monomer, followed by the polymerization and termination of the polymerization. Consequently, it is made possible to suppress a rapid increase in viscosity during the polymerization thereby to obtain a water soluble branched polymer having high molecular weight and low viscosity.

A process for the conversion of linear and/or branched paraffins hydrocarbons, catalysed by an ionic liquid catalyst, in the presence of a cyclic hydrocarbon additive containing a tertiary carbon atom. The presence of the specific hydrocarbon additives influences the reaction mechanism by increasing the selectivity towards the formation of paraffin hydrocarbons with a higher degree of branching.

Disclosed is a process of controlling the degree of branch of high 1,4-cis polybutadiene without any alternation in the 1,4-cis content and the polymerization yield, in which a dialkylzinc compound represented by the following formula I is added in a controlled amount as an agent for controlling the degree of branch of high 1,4-cis polybutadiene, thus guaranteeing the optimum processability and physical properties of polymer according to the use purpose. Formula I<paragraph lvl="0"><in-line-formula>R1-Zn-R2</in-line-formula>wherein R1 and R2 are same or different and include an alkyl group containing 1 to 5 carbon atoms.

The invention discloses a hyperbranched polyester hot-melt-type polyurethane adhesive for weaving and a preparation method thereof. The hyperbranched polyester hot-melt-type polyurethane adhesive comprises polyether polyol, hyperbranched polyester polyol, MDI and an additive. The preparation method comprises preheating hyperbranched polyester polyol at 100-150 DEG C until melting to obtain hyperbranched polyester polyol pre-melt, checking the hermeticity of a reactor, removing water through replacing with nitrogen gas, carrying out preheating to 50 DEG C, orderly adding MDI and polyether polyol into the reactor, carrying out stirring in vacuum under control of a jacket temperature to 60-80 DEG C for a reaction for 1-3h, fast cooling the reaction system to 55 DEG C to obtain a polyurethaneprepolymer, orderly adding polyester polyol and the hyperbranched polyester polyol pre-melt into the polyurethane prepolymer in vacuum, heating the mixture to 60-80 DEG C, carrying out stirring for areaction for 1-3h, breaking vacuum after the reaction, and removing air bubbles to obtain the hyperbranched polyester hot-melt-type polyurethane adhesive for weaving.

The invention provides an emulsion polymerization method for hybridizing and reinforcing a butadiene-acrylonitrile-isoprene copolymer in situ by using vinyl tetraethoxysilane and microcrystalline cellulose as a compounded reinforcing agent. The number average molecular weight of the prepared copolymer is 5*10<4> to 40*10<4>; the isoprene content is 10 to 60 percent; the butadiene content is 10 to 80 percent; the acrylonitrile content is 15 to 55 percent; and in the copolymer, the 1,4-polyisoprene content is 60 to 95 percent, the 3,4-polyisoprene content is 5 to 30 percent, the 1,4-polybutadiene content is 60 to 90 percent and the 1,2-polybutadiene content is 10 to 40 percent. The copolymer has the characteristics of excellent mechanical property and simpleness in process, meets the high-performance requirement of nitrile rubber and enlarges the application range.

The invention discloses a biological modification method for inhibiting starch retrogradation, and belongs to the field of agricultural product processing and biology. The method comprises the steps of dissolving starch into water to obtain 30% (w/v) of starch milk, adjusting the pH to 7.5, adding 300-1,000U/g of starch branching enzyme of dried starch, treating at 50 DEG C for 4-10h to obtain a reaction solution, washing the reaction solution with deionized water, collecting solid and performing vacuum drying to obtain biological modified starch. By adopting the method, starch molecules have smaller branched chains and relatively high branching degree through the modification effect of the starch branching enzyme to hinder the rearrangement of amylopectin in the storage process, so that starch retrogradation can be well inhibited.

The invention relates to a method for preparing hyperbranched waterborne polyester resin which is composed of, by weight, 6-10% of TMP, 15-20% of DMPA, 0.1-0.5% of p-toluene sulfonic acid, 15-25% of neopentyl glycol, 12-20% of m-phthalic acid, 20-30% of maleic anhydride or phthalic anhydride, 6-10% of adipic acid, 0.1-0.5% of p-methoxyphenol, 20-30% of ethylene glycol monobutyl ether, 12-20% of dimethylethanolamine, and 70-130% of deionized water. The prepared hyperbranched waterborne polyester resin has the advantages of excellent hydrolysis resistance, water dispersibility and storage stability, has the characteristics of high glossiness, good abrasion resistance, strong adhesion powder, high fullness, excellent impact resistance and the like no matter the resin is made into a waterborne stoving varnish with amino resin or is made into a waterborne woodware paint with hydrophilic polyisocyanate, and is widely used in surface coating and protection of woodware, metals, zinc alloys, aluminum alloys, magnesium alloys, plastics and other products,.

The invention discloses amphiprotic leather tanning agent and a preparation method thereof. The preparation method of the amphiprotic leather tanning agent comprises the following steps of: based on weight parts, adding an SMA (Styrene Maleic Anhydride) copolymer, N, N-dimethyl fatty alcohol amine and a catalyst to a reaction kettle in which a condensing device is installed; adding a solvent to react, and measuring a hydroxyl value in the reaction system; adding dimethyl sulfate to react when the hydroxyl value (in terms of solid) is smaller than and equal to 10 (mg KOH/g); distilling under reduced pressure under the vacuum condition to remove the solvent; and adjusting a pH value by using an alkali aqueous solution; and adjusting the mass concentration of the product to 20%-40%. The amphiprotic leather tanning agent disclosed by the invention not only retains the filling performance of the SMA tanning agent, but also improves the color fading defect of the SMA tanning agent. Meanwhile, the modified SMA tanning agent has good emulsifying dispersion; and the leather body, which is tanned again by the amphiprotic tanning agent, is full and soft, and is good in elasticity and higher in tensile strength and tearing strength.

The invention provides a nitryl asymmetric alpha-diimine nickel complex for preparation of ultrahigh-molecular-weight polyethylene and an intermediate, a preparation method and application of the nitryl asymmetric alpha-diimine nickel complex. The nickel complex has a single catalytic active center, regulation of polymer molecular weight and branching degrees can be realized through changing of aligand structure and polymerization conditions, and high catalytic activity, low cost, performance stability and the like are achieved. The preparation method is mild in condition, short in period andsimple in operation condition. The nickel complex can be applied to catalytic vinyl polymerization, the catalytic activity is up to 4.61*10<6>g mol<-1>(Ni) h<-1>, the weight-average molecular weightMw of prepared polyethylene fluctuates in a range of 8.2-32.8*10<5>g mol<-1>, molecular weight distribution is in a range of 1.8-2.8, the remarkable performance of polyethylene molecular weight control is achieved, and the nickel complex can be used for preparation of ultrahigh-molecular-weight polyethylene; obtained polyethylene is high in branching degree, the melt temperature Tm is in a range of 76.9-117.2 DEG C, and accordingly the polyethylene can be used as engineering plastic at a high environment temperature, and a promising industrial application potential is achieved.

The invention relates to a method for preparing acrylate-modified waterborne polyurethane from soybean oil polyalcohol. The method for preparing acrylate-modified waterborne polyurethane from soybean oil polyalcohol specifically comprises the steps that two kinds of soybean oil polyalcohol are mixed according to different proportions, and then the mixture and isocyanate are subjected to gradual addition polymerization to obtain waterborne polyurethane; waterborne polyurethane and an acrylate monomer are subjected to graft copolymerization to obtain acrylate-modified waterborne polyurethane. According to the method, acrylate-modified waterborne polyurethane is synthesized by taking renewable vegetable oil as a raw material, and acrylate-modified waterborne polyurethane is green, environmentally friendly and biodegradable. The prepared material is high in heat resistance, low in brittleness, high in transparency and scraping resistance, full in brightness and high in impact resistance and adhesion.

Provided is a polyethylene material and application thereof. A density distribution of the polyethylene material is in a range of 0.880 g/cm³-0.960 g/cm³. An amount of a fraction at a temperature of 40° C. obtained by conducting temperature rising elution fractionation on the polyethylene material is in a range of 9.0 wt %-40.0 wt %, preferably in a range of 10.0 wt %-25.0 wt %, more preferably in a range of 9.9 wt %-20.0 wt %. A melting temperature of the polyethylene material is 110° C.-135° C., preferably 116° C.-130° C. The polyethylene material provided by the present application has distinctly improved amount of medium/low-molecular-weight fractions and high-degree-branching fractions, as well as relatively high-molecular-weight fractions which are highly branched. The polyethylene material thus has a relative high melting temperature.

The invention belongs to the field of tertiary oil recovery, and particularly relates to an amphiphilic polymer oil-displacing agent with a biquaternary ammonium salt long chain structure and a preparation method of the amphiphilic polymer oil-displacing agent. For the technical problem that the salt resistance of an oil-displacing agent adopted in the prior art is frequently poor, the oil-displacing agent with good salt resistance, viscosifying action and shear resistance is provided. Firstly, N,N-dimethylhexadecylamine and cis-1,4-dichloro-2-butene are taken as raw materials to synthesize adouble-branched cationic hydrophobic monomer N,N'-bis(hexadecyl dimethyl)-1,2-chloride-2-butene-ammonium salt (CC16-DMBAC), then the CC16-DMBAC and acrylic amide (AM) perform copolymerization, a cationic group and a hydrophobic long chain are introduced onto an acrylic amide main chain, so that polymer molecules form a three-dimensional network structure with a certain strength by virtue of a hydrophobic interaction function among the molecules, and the oil-displacing agent has viscosifying action and good shear resistance and salt resistance.

The invention provides a 4,4'-difluorobenzhydryl containing asymmetric alpha-diimine nickel complex, and an intermediate, a preparation method and an application thereof. The nickel complex prepared by using the method provided by the invention has a single catalytic active center, can realize control of polymer molecular weight and branching degree by changing a ligand structure and polymerization conditions, and has the advantages of high catalytic activity, low cost, stable performance, etc. The preparation method has the advantages of mild conditions, short cycle and simple operation conditions. The nickel complex prepared by using the method provided by the invention can be used in a catalyst used for ethylene polymerization, and has the activity of catalyzing ethylene polymerization up to 2.20 * 10<7> g.mol<-1>(Ni).h<-1> under the condition of no oxygen; and the prepared polyethylene has a weight-average molecular weight Mw fluctuating in a range of (1.35-10.50) * 10<5> g.mol<-1> and molecular weight distribution in a range of 1.9 to 2.5. The nickel complex provided by the invention has good industrial application prospects.

A preparing method of dicyclopentadiene hydrogenated petroleum resin is disclosed. The method mainly includes depolymerizing crude dicyclopentadiene into cyclopentadiene, mixing the cyclopentadiene and a solvent, feeding one part of the mixture into a reactor, reacting the one part of the mixture, adding the other part of the mixture in a batch manner after the reaction is started, and finally hydrogenating the reaction solution to prepare the hydrogenated petroleum resin. The method increases the product yield, ensures that the prepared resin is free of gel, sulfur and other impurities and can be directly used for hydrogenation without treatment, and prepares a hydrogenated petroleum resin product with excellent performance and stable quality under the premise of ensuring the service lifetime of a catalyst.

The present invention relates to a method for preparing a high 1,4-cis polybutadiene having a controlled cold flow and, more particularly, to a novel method for preparing a high 1,4-cis polybutadiene having a controlled cold flow that involves initiating polymerization of a 1,3-butadiene in the presence of a non-polar solvent using, as a polymerization catalyst, a complex prepared by mixing a neodymium compound with or without a conjugated diene compound, a halogenated organoaluminum compound or a halogenated organic compound, and an organoaluminum compound irrespective of the addition order of the catalyst; and adding an organoborane compound as a cold flow controller of 1,4-cis polybutadiene after a predetermined time of the polymerization. Accordingly, a high 1,4-cis polybutadiene having an efficiently controlled cold flow can be prepared without causing a significant increase in the Mooney viscosity (molecular weight), an odor (bad smell), and a reduction in 1,4-cis content and polymerization yield.

The invention discloses a high-toughness polyvinyl butyral film. The high-toughness polyvinyl butyral film is prepared from the following components in parts by weight: 100 parts of polyvinyl alcohol, 30-55 parts of butanal, 5-10 parts of hydrochloric acid, 15-30 parts of triethylene glycol di-2-ethylhexoate, 10-20 parts of pentaerythritol, 5-15 parts of ethanolamine, 2-7 parts of abietic acid and 300-800 parts of deionized water. The high-toughness polyvinyl butyral film has excellent adherence, has both softness and toughness, and also has excellent weather fastness. The invention also discloses a preparation method of the high-toughness polyvinyl butyral film.

The invention discloses a yellowing-resistant elastic styrene-acrylic emulsion and a preparation method thereof. The emulsion comprises the following components in parts by weight: 80-120 parts of deionized water, 15-25 parts of styrene, 55-65 parts of butyl acrylate, 3-10 parts of acrylonitrile, 25-35 parts of isooctyl acrylate, 0.1-1.5 parts of methacrylic acid, 0.1-1.5 parts of acrylamide, 0.5-3.5 of itaconic acid, 0.1-1.5 parts of an antioxidant, 2-10 parts of an emulsifier, 0.1-2 parts of an initiator, and 0.2-2.5 parts of sodium hydroxide. According to the method provided by the invention, the prepared elastic styrene-acrylic emulsion has excellent normal-temperature and low-temperature elasticity, and very good yellowing resistance; and the preparation process is simple, and the operability is high.