1034results about How to "Increase steric hindrance" patented technology

The invention relates to an olefin two-phase hydroformylation method, which consists of three parts: polyether guanidine mesylate ionic liquid (PGMILs) with room temperature solidifiable characteristics, complex catalysts (Rh-TPPTS) formed by RhCl3.3H2O or dicarbonylacetylacetonato rhodium and triphenylphosphine sodium trithionate (TPPTS), and reactants of C6-C14 straight chain 1-olefin, wherein the Rh-TPPTS is dissolved in the PGMILs to form a lower layer catalyst phase, the C6-C14 straight chain 1-olefin or product aldehyde forms an upper layer organic phase, the selectivity of high-carbon aldehyde is 85 to 99 percent, the mol ratio of normal aldehyde to isomerism aldehyde is 2.0 to 2.4, the PGMILs phase containing Rh-TPPTS can be cyclically used for 35 times, the activity and the selectivity are unchanged, the accumulated conversion number (TON) reaches higher than 30000, rhodium flowing to the product phase is 0.04 percent to 0.07 percent, and ultra-long-period catalysis activity and selectivity can be realized.

The present invention discloses slow-release cationic anti-mud polycarboxylic-type high performance water reducer and a preparation method thereof. The slow-release cationic anti-mud polycarboxylic-type high performance water reducer is successfully synthesized from an unsaturated carboxylic acid, a polyether macromonomer, a cationic unsaturated monomer, an unsaturated esters, a crosslinking agent, a chain transfer agent, an oxidizing agent and a reducing agent as raw materials at room temperature without heat source. By introduction of the long-chain-ester crosslinking agent and the cationic unsaturated monomer, the slow-release cationic anti-mud polycarboxylic-type high performance water reducer has good slow-release and anti-mud effects, is low in admixing volume, high in water-reducing rate, excellent in slump retention ability, and not sensitive to mud contained in sand and stones, and the process does not require an additional heat source, an be carried out at room temperature, and is low in investment, low in cost, and suitable for large scale promotion and application.

The invention discloses a diaphragm for a sounding device, a sounding device and an assembling method thereof. The diaphragm includes a diaphragm layer prepared by subjecting at least one of an ethylene-acrylate copolymer and an ethylene-acrylic ester-carboxylic acid copolymer to crosslinking reaction. The molecular structure of the diaphragm includes a vinyl-acrylic group. The group reduces the chemical structure symmetry of a material, reduces tacticity, and increase steric hindrance, so that the diaphragm has a high loss factor and the sounding device has a good damping effect.

The invention belongs to the technical field of materials, and particularly relates to full-transparence high-strength self-repairing polyurethane elastomer as well as a preparation method and application thereof. The full-transparence high-strength self-repairing polyurethane elastomer comprises carbamate and a disulfide bond structure unit, wherein the structural formula is shown in formula (I):(shown in the description), wherein the disulfide bond is designed and distributed in a hard section area in a split-phase control manner, so that a self-repairing and differential structure adjusting effect can be realized, and the physical and mechanical performance such as the strength and toughness can be improved. Compared with the polyurethane copolymer elastomer comprising the disulfide bond in the prior art, the full-transparence high-strength self-repairing polyurethane elastomer disclosed by the invention is far better in the mechanical strength, toughness, transparence and the likecompared with the traditional polyurethane elastomer.

The present invention discloses a porphyrin derivative with large substituent and its pharmaceutical acceptable salt and its preparation method. The described porphyrin derivative is M-5,10,15,20-tetra[(N)-substituted-n-phenyl or heterocyclic radical] porphyrin, in which n represents 2,3 and 4 postion substitution, and M is one of Fe, Mn, Co, Ni, Cu Zn, Sn, Cr and V metal ions. Said invented porphyrin derivative has higher steric hindrance, and can effectively resist the combination of porphyrin with DNA, and can reduce the mutual transformation between the different isomers, reduce toxicity of porphyrin and raise its medicinal practicability. The described porphyrin derivative can be used as small molecular antioxidant for regulating concentration of peroxide between cells of human body or in cell.

The invention discloses a polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent and a preparation method thereof. According to the preparation method, in the presence of nano-silica, a polymer-base nanometer composite material with amphiphilic block hydrophobic associating polymer wrapping inorganic nano-silica is successfully synthesized by virtue of a micellar emulsion polymerization method and combines the rigidity and the heat stability of the inorganic nano-silica and the characteristics of the amphiphilic block hydrophobic associating polymer together, and the temperature resistance, the salt tolerance and the thickening property of the polymer are obviously improved by virtue of the polymer-base nanometer composite material on the basis of the existing good performances of the amphiphilic block hydrophobic associating polymer. As a temperature-resistant, salt-tolerant and fluid loss reducing agent for a drilling fluid in the drilling engineering, the polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent has a remarkable fluid loss reducing effect under high temperature and high salinity.

The invention discloses a bis (imino) pyridine iron olefin polymerization catalyst and a preparation method and application thereof. The catalyst is a novel bis(imino)pyridine iron complex with the asymmetric substitution of position 2 and 6 of an aromatic ring; and the structural formula of the catalyst is shown in formula (I), wherein X is halogen, R1 is alkyl, and R2 is the alkyl or oxyl. The catalyst can be obtained through a Friedel-Crafts reaction, a ketoamine condensation reaction and a coordination reaction. The preparation method is simple, and raw materials are cheap. The catalyst can catalyze the polymerization of ethylene under the activation of MAO to prepare polyethylene with high molecular weight and wide distribution.

The invention relates to a polyamide composition with high dimensional stability and a preparation method thereof. The polyamide composition comprises the following components in parts by weight: 60 to 90 of fatty polyamide composition, 2 to 10 of compatilizer, 1 to 10 of inorganic metal compound, 0 to 5 of polysiloxane with low molecular weight and 0 to 2 of auxiliary agent. The preparation method comprises the following steps of: premixing the raw materials in a high-speed mixer for 10 to 30min, controlling the temperature to be 40 to 60 DEG C, then adding premix into a double-screw extruder, conveying, melting, shearing, extruding, cooling and granulating so as to prepare a polyamide composition product with high dimensional stability. Compared with the prior art, the invention shows excellent dimensional stability and heat distortion temperature with high retention rate, is suitable for occasions with higher requirement to the dimensional stability, such as the panel of the air conditioner of an automobile, an instrument panel, a camera bracket, a sports apparatus and the like, and can be directly processed by injection molding or other forming methods.

The invention discloses phospholipid derivatives for branching polyethylene glycol, and a lipid membrane structural body composed of the same. The general formula of the phospholipid derivatives is as shown in the specification, wherein X1 and X2 are hydroxyl with 1-20 carbon atoms respectively and independently; n1 and n2 are integers ranging from 1 to 1000 respectively and independently, n3 is an integer ranging from 0 to 1000, and n1+n2+n3 is not less than 2 and not greater than 2000; Y is a branching centre with 1-20 carbon atoms, and connected with L1, L2 and L3 by a covalent bond; L1, L2 and L3 are linking groups for Y and polyethylene glycol units; q is 0 or 1; when n3=0, q is 0 and Y is not the polyamino acid residue of 2-10 amino acid residues; L4 is a linking group; M is hydrogen atom or cation; R is the residue of hydrophobic lipids. The lipid membrane structural body composed of the phospholipid derivatives for branching polyethylene glycol is used for wrapping a medicine and capable of effectively prolonging the cycle time of the medicine in a body.

The invention belongs to the technical field of deep processing and modification of oil, and particularly discloses a method for preparing glyceride rich in EPA and DHA through enzyme catalysis .Fish oil rich in EPA and DHA is used as the raw material, efficient selective catalysis of fish oil hydrolysis is conducted with lipase, and glyceride rich in EPA and DHA is obtained through molecular distillation separation purification by strictly controlling hydrolysis conditions including enzyme adding amount, pH, water-oil ratio, temperature and time .To increase the utilization rate of raw materials, EPA and DHA in a free fatty acid product obtained through molecular distillation are recovered with the urea coating method, so that transesterification can be conducted between EPA and DHA subjected to ethyl esterification and glyceride obtained through molecular distillation and rich in EPA and DHA, and the content of triacylglycerol, the content of EPA and the content of DHA in glyceride are further increased .The content of EPA and the content of DHA in triacylglycerol type fish oil obtained with the method can be increased by 25% and 15% or more respectively.

The invention discloses a preparation method and application for an amphoteric polycarboxylate water reducer containing anions and cations. The method is designed through a high-molecular structure, and the quaternary-ammonium-salt type carboxylate water reducer terminated with a cation is synthesized by performing modification on allyl polyethenoxy ether. According to the synthesized water reducer, anionic charges and cationic charges are both introduced into the molecular structure of the water reducer, when the water reducer is added into cement slurry, anionic charges at the main chain are adsorbed on the surface of cement particles with positive charges, and the anionic charges at the terminals of side chains are adsorbed on the surface of cement particles with negative charges, so that cement particles are dispersed. Cations are capable of inhibiting expansion of soil, so that adsorption of soil to additives is reduced. Because of the unique amphoteric structure of the water reducer, the water reducer possesses unique dispersing capability, high water reducing rate, good slump maintenance property and excellent performances. Also, the invention provides the amphoteric polycarboxylate water reducer prepared by employing the method, and application of the water reducer to concrete.

The invention discloses a preparation method of a hexamethylene diisocyanate tripolymer curing agent, which comprises the following steps: putting an isocyanate monomer into a reaction vessel in a nitrogen gas protective atmosphere, dropwisely adding an isocyanate trimerization catalyst containing 2-hydroxyalkyl quaternary ammonium hydroxide within 1-1.5 hours, reacting while stirring at 30-80 DEG C for 2-24 hours, wherein the mass of the isocyanate trimerization catalyst accounts for 0.01-0.5% of that of the isocyanate monomer; when the mass percent of free NCO groups is measured to be 30-40%, adding an isocyanate trimerization inhibitor, wherein the mass of the isocyanate trimerization inhibitor accounts for 0.1-1% of that of the isocyanate monomer; and feeding the obtained polyurethane tripolymer curing agent into a separation device through a distributor at a feed rate of 1-20g/min, and separating to obtain the hexamethylene diisocyanate tripolymer curing agent. The curing agent disclosed by the invention is favorably compatible with resin, and has ultraviolet irradiation resistance, high compatibility, low viscosity and high mechanical strength.

The invention provides a preparing method for polycarboxylate water reducing agent. The polycarboxylate water reducing agent composed of, by weight, 30%-55% of deionized water, 35%-50% of polyoxyethylene ether, 5%-10% of carboxylic acid derivatives monomer, 0.0005%-0.002% of catalyst, 1.5%-4.5% of initiator, 0.2%-0.8% of chain transfer agent, 1.0%-2.5% of structure modifying agent and 4.5%-8.5% of alkali liquor. Under the temperature of 20-35 DEG C, the deionized water and the polyoxyethylene ether are enabled to be put in a reaction still to be dissolved, after the deionized water and the polyoxyethylene ether are fully dissolved, the carboxylic acid derivatives monomer, the catalyst, the initiator, the chain transfer agent and the structure modifying agent are enabled to be added in sequence, after stirring for 28-32 minutes, the mixed liquor still standings for 4-6 hours under room temperature, the alkali liquor is added in under a state of stirring, a potential of hydrogen (PH) value is adjusted to be 6.0-7.5, and then products are achieved.

The invention discloses a branched polyethylene glycol iso-bifunctional derivative, as well as a preparation method and a two-component biological related substance conjugate thereof. The structure ofthe branched polyethylene glycol iso-bifunctional derivative is shown as a general formula (1) and contains i (more than or equal to 2) alkoxy-terminated PEG chains, U is a branched center of a valence state i+1, Ld does not exist or becomes a bivalent linking group, and the iso-bifunctional end is composed of a trivalent branched center G and two different functional ends F1 and F2 and respectively independently contains a plurality of functional end groups R01 and R02 of the same type. Two functional groups of the branched polyethylene glycol iso-bifunctional derivative are positioned on the same side of the branched polyethylene glycol component, a product of the conjugated biological related substance is a branched polyethylene glycol two-component biological related substance, the functional groups are conjugated with two different biological related substances and are uniformly distributed on the same side of the polyethylene glycol component, and the derivative is capable of improving properties of targeted drugs, optically marked drugs and the like and is expected to be applied to the field of drug combination. The structural formula is as shown in the description.

The invention discloses an anti-mud type phosphate modified polycarboxylate superplasticizer and a preparation method thereof. The method specifically comprises the following steps: performing oxidation-reduction free radical polymerization reaction on unsaturated carboxylic acid micro-monomer and unsaturated polyether macro-monomer in the presence of an initiator, a reducing agent and a chain transfer agent, thereby acquiring a carboxyl-containing polycarboxylate superplasticizer prepolymer; with diphenyl phosphoryl chloride, modifying the carboxyl-containing polycarboxylate superplasticizer prepolymer partially, thereby acquiring a phosphate based copolymerization product; after completing the reaction, regulating the pH value to 6-7 and adding water, thereby acquiring the polycarboxylate superplasticizer. According to the invention, the side chain of the polycarboxylate superplasticizer is modified into a phosphate group containing two benzene rings and the phosphoric acid functional group enters into the carminate element of the polycarboxylate superplasticizer, so that the sulfate radical resisting capacity and anti-mud capacity of the polycarboxylate superplasticizer are promoted. The introduction of the benzene rings can greatly increase the physical size of the side chain of the polycarboxylate superplasticizer and the polycarboxylate superplasticizer is unlikely to be inserted into the layered structure of clay, so that the anti-mud effect can be achieved and the intrinsic function of the polycarboxylate superplasticizer is not influenced.

The invention provides a chiral aluminum compound and a preparation method thereof and a preparation method of polylactic acid. The structure of the chiral aluminum compound is shown as a formula (I). In the structural formula (I), on one hand, a chiral molecule has relatively large molecular space and obtains relatively large spatial steric hindrance, so that the selectivity of the chiral molecule for ring opening polymerization of lactide is enhanced and the regularity of the spatial structure of a polymerization product is improved, and on the other hand, with metal aluminum as a central atom, the reactivity of a catalyst is enhanced and the activity of polymerization reaction is improved. The invention further provides the preparation method of the polylactic acid. The polylactic acid obtained by catalyzing racemic lactide with the chiral aluminum compound is polylactic acid with isotactic components as predominant components, and the isotactic components account for 0.64.

The invention discloses a preparation method of a water retaining agent. The preparation method comprises the following steps: carrying out an aqueous phase radical polymerization reaction on unsaturated amide micro-monomers, unsaturated sulphonic acid micro-monomers and unsaturated polyether macromers or unsaturated ester macromonomers under the coaction of an oxidation-reduction system composed of an initiator and a reducing agent to obtain a copolymerization product, regulating the pH value to 6-7 after the reaction, and adding water to obtain the water retaining agent with mass concentration of 1-60%. The preparation method disclosed by the invention is used for adjusting the product properties by controlling the monomer proportion, the temperature and the dosage of the initiator and the reducing agent, the reaction speed is high, the efficiency is high, no organic solvent is used, no toxin or pollution is generated, and the operation is simple. The unsaturated macromonomers are introduced into the prepared concrete/mortar water retaining agent to ensure excellent water retaining property and obviously perfect such stirring states of the concrete/mortar as bleeding/separation and the like without generating such adverse effects as strength and the like, meanwhile, the water retaining agent can be compounded with a polycarboxylic acid water reducing agent at any proportion to ensure good intermiscibility. The product performance is stable.

The present invention is one kind of emulsified acrylate thickener for paint printing. It consists of acrylic acid 160-170 weight portions, vinyl benzene sulfonic acid 90-95 weight portions, 2-acrylamido-2-methypropyl sulfonic acid 18-19 weight portions, chlorotrimethylamino propyl acrylamide 22-24 weight portions, 20 % concentration ammonia water 300-320 weight portions, glyceryl dimethcrylate 2.5-3.5 weight portions, No. 200 solvent oil or aviation kerosene 100-150 weight portions, hydrogenated polyoxyethylene castor oil ether 22-28 weight portions, and ammonium persulfate 5-7 weight portions, which are reverse emulsion polymerized and mixed with linear organosilicon body in 4-6 weight portions. It has high water combining capacity, great electrolysis capacity, good handle and high color brightness.

The invention relates to a benzene-cored organic compound and application of the benzene-cored organic compound to OLED (organic light emitting diode) devices. The benzene-cored organic compound is high in glass transition temperature and molecular thermal stability, applicable in HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy level and high in Eg, and through device structural optimization, can effectively improve the photoelectric performance of the OLED devices and prolong the service life of the OLED devices.

The invention discloses a water-soluble dispersing agent for gel ink and a preparation method of the water-soluble dispersing agent. According to the method, styrene-maleic anhydride polyester adopting an amphiphilic structure is modified through ethylene glycol amine and diammonium hydrogen phosphate, and the styrene-maleic anhydride polyester dispersing agent with large steric hindrance and a multi-charge structure is prepared. The dispersing agent has a good dispersion effect on pigments, is especially applicable to preparation of gel ink high-concentration color paste, can be used for preparing gel ink high-concentration color paste with the concentration higher than 40 wt. %, has low system viscosity, good stability and a wide application range and has a wide market prospect.

The invention relates to a boron-containing organic compound and application of the boron-containing organic compound to an OLED device. The structure of the compound is shown as a general formula (1), the whole molecule of the compound is a large rigid structure, and the introduction of substituent groups reduces the planarity of a material, so the steric hindrance of the material is increased, the material is not easy to rotate, and a three-dimensional space structure is more stable; and therefore, the compound has higher glass transition temperature and molecular thermal stability. In addition, the HOMO and LUMO distribution positions of the compound are separated from each other, so the compound has appropriate HOMO and LUMO energy levels; and therefore, after the compound is applied to the OLED device, the luminous efficiency of the device can be effectively improved, and the service life of the device can be effectively prolonged.

The invention relates to an AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent and a synthesis method thereof. According to the technical scheme, the polymer drive-adjusting reagent takes acrylamide (AM), diacetone-acrylamide (DAAM), 2-acrylamide-2-methyl-2-propene-1-sulfonic acid (AMPS) as monomers, and the optimal added amount for synthesis is as follows: concentration of the monomers is 20% (percent accounting for the total mass of reactants), and monomer ratio of AM to DAAM to AMPS is 7:1:2 (mass ratio); the added amount of a crosslinking agent is 0.07% (percent accounting for the total mass of the monomers); and the added amount of an initiating agent is 0.4% (percent accounting for the total mass of the monomers). The synthesis method of the AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent comprises the following steps: weighing monomers AM, DAAM and AMPS according to the optimal added amounts, putting the monomers into a wide-mouth bottle, adding a certain amount of purified water to prepare a solution, titrating with a NaOH solution until pH value is 7, then adding an initiating agent and a crosslinking agent, and reacting in a water bath at the temperature of 50 DEG C for 3 hours; and finally washing with absolute ethyl alcohol, smashing, and drying, so that AM-DAAM-AMPS ternary polymer gel particles are obtained. The AM-DAAM-AMPS ternary polymer gel particles have good heat resistance, salt tolerance and plugging property and can be applied to oilfield flooding development as a drive-adjusting reagent.