37results about How to "Good steric hindrance" patented technology

The invention discloses a Gemini-like rosin segmented polyether sulfonate, a preparation method thereof and application thereof. The preparation method comprises the following steps: sequentially polymerizing a maleic rosin activated monomer with epoxypropane and oxirane in molar ratios to form a segmented copolymer, taking carbamide as a catalyst, sulfonating the carbamide with an aminosulfonic acid in a molar ratio of 1:0.8-2, dissolving the reaction product with a low-molecular weight and low-viscosity alcohol so as to assist filtration, removing the low-molecular weight alcohol, if necessary, replacing a system ammonium with an alkali to release ammonia gas, and forming a liquefied compound of the sulfonate with good dispersity, emulsibility and stability. The Gemini-like rosin segmented polyether sulfonate of the invention can be applied to a pesticide emulsion in water, a suspension agent in water, a suspension agent in oil, a suspending emulsion, a suspending seed coating and other preparations in which the water is used as a continuous phase, and has the advantages of low production cost, practical and feasible process, environmental protection, no pollution, good application performance and the like.

The invention provides a polycarboxylic acid water reducing agent used for a polyether with a molecular weight of 1200 and a preparation method of the polycarboxylic acid water reducing agent. The polycarboxylic acid water reducing agent comprises the following components in parts by weight: 310-330 parts of a polyether macromonomer with a molecular weight of 1200, 4-14 parts of acrylic acid, 2-9parts of a carboxylate monomer, 2-5 parts of a fluoro functional monomer, 0.9-1.8 parts of hydrogen peroxide, 4-10 parts of a flexible chain monomer, 0.32-0.5 part of a reducing agent, 0.3-0.7 part ofa chain transfer agent, 6-10 parts of a neutralizing agent, and the balance water, wherein a total mass is 1000 parts, and after preparation is performed, a mass fraction of a finished product is 40%, and an acid-ether ratio is 2.7-3.3. The method is performed according to the following steps: 1, material addition for the first time; 2, addition of the hydrogen peroxide; 3, addition of a solutionA and a solution B; and 4, preparation of the finished product. The polycarboxylic acid water reducing agent and method provided by the invention adopt the polyether monomer with the molecular weightof 1200 as a raw material to obtain a suitable side-chain length which can be stretched in the environment, and the problem of weaken steric hindrance brought by a short side chain is compensated.

The invention belongs to the field of polymer synthesis, and particularly relates to a dispersant for pesticide preparations. The dispersant is prepared from (in mass percent) 1% to 30% of glycidyl ether group-terminated methylallyl alcohol polyoxyethylene ether, 1% to 30% of methylallyl alcohol polyoxyethylene ether ammonium sulfate, 5% to 30% of methacrylate, and 10% to 90% of methacrylic acid in a water-soluble initiator under copolymerization, and is used as a pesticide dispersant in pesticide suspension systems, suspension emulsion systems and the like. Due to the uniform distribution of lipophilic and hydrophilic groups in the molecule, and the adsorption and dispersion effect is good, thereby facilitating the smooth preparation of a suspension system with stable performance.

The invention relates to the technical field of processing and modification of polymer materials, and concretely relates to an environmentally-friendly biomass flame retardant and a processing technology thereof. The technology comprises the following steps: sodium alginate and water are mixed, and stand for swelling, the obtained solution is heated and stirred to achieve dissolving, octenyl succinic anhydride is added, the obtained solution is stirred and reacted at a constant temperature, a sodium hydroxide solution is added to adjust the pH value to 8.1-8.2, and the obtained solution is neutralized with hydrochloric acid after the reaction is finished in order to obtain a modified sodium alginate emulsion; modified rice husks, the modified sodium alginate emulsion, plant essential oil,pretreated bone powder, calcium bicarbonate, n-butyl acetate, Escherichia coli, urea ad N,N-dimethylcyclohexylamine are mixed, and the obtained mixture is stirred at a constant temperature, and then is spray-dried to obtain a blank material; and the blank material is treated with trimethylaluminum-containing nitrogen, then is treated with introduced water-containing nitrogen, and is dried to obtain the environmentally-friendly biomass flame retardant. The environmentally-friendly biomass flame retardant provided by the invention has excellent flame retardant properties and excellent mechanicalproperties.

The present invention discloses an organic electroluminescent compound and uses of the organic electroluminescent compound in preparation of organic electroluminescent devices, and provides an organicelectroluminescent device, which comprise the organic electroluminescent compound. According to the present invention, by introducing the Tip-triazine carbazole structure, the compound achieves the good photoelectric property.

The invention discloses a production process of a hydrophobic polyimide film, which belongs to the technical field of modified polyimide film preparation. The production process of the hydrophobic polyimide film comprises the following steps of preparing a diamine monomer A, reacting a diamine monomer A with a dianhydride monomer to prepare a polyamic acid solution, and performing imidization to obtain a polyimide film. A diamine monomer A is prepared, so that the prepared polyimide has a C-F bond and a siloxane chain with excellent hydrophobic performance, the diamine monomer A is provided with an ester group in the middle, the structural symmetry degree of the diamine monomer A is relatively high, a polymer can locally form microcrystals, and due to the existence of the local microcrystals, the diffusion of water molecules in the polymer is hindered; when water molecules encounter local microcrystals of a macromolecular chain, macromolecular chain segments in a crystalline structure are tightly piled, so that the water molecules cannot permeate and diffuse, the advancing of the water molecules is blocked finally, and the hydrophobic performance of the film is further improved.

The invention relates to the field of dental ulcer treatment medicine, in particular to a dental ulcer spray and a preparation method thereof. The dental ulcer spray is prepared from, by mass, 1-3 parts of regeneration promoter, 0.3-0.5 part of anti-inflammatory agent, 1-4 parts of film-forming agent, 0.5-2.5 parts of pore-foaming agent, 0.1-0.2 part of suspending agent, 0.1-0.2 part of antioxidant, 0.1-0.2 part of astringent and 92-98 parts of solvent. The dental ulcer spray is good in treatment effect, and meanwhile has the effects of diminishing inflammation, relieving pain and promoting ulcer healing.

The invention belongs to the technical field of polyester. In order to solve the hydrophile problem of polyester, the present invention provides a micro-crystalline cellulose modified polyester preparation method. The method comprises in sequential order the steps of preparing the micro-crystalline cellulose and conducting the surface decoration, beating the micro-crystalline cellulose into pulp, and conducting the in-situ addition of the micro-crystalline cellulose. The prepared polyester had a good hydrophile property. Polyhydroxy active site can enable the fiber to be dyed under mild conditions and have an excellent dying property. The polymer can be widely used for preparing fiber with moisture absorbing, sweat dispelling and anti-static properties, and can be used as a close-fitting fabric and a high color fastness fiber product.

The invention discloses a stable pumping type slump retaining agent and a preparation method thereof, and belongs to the technical field of concrete. The slump retaining agent is mainly prepared by polymerizing the following components in parts by mass: 18.6 to 20.1 parts of polyether alcohol, 301.8 to 310.0 parts of cyclic monomer, 0.3 to 0.9 part of catalyst, 42.5 to 43.6 parts of ester substance, 2.1 to 5.4 parts of reducing agent, 2.5 to 4.4 parts of initiator, 0.8 to 2.6 parts of chain transfer agent, 5.3 to 7.9 parts of neutralizing agent and the balance of water, wherein the total mass of the raw materials is 1000 parts. The polyether monomer is firstly prepared, the acid-ether ratio of the prepared slump retaining agent is determined according to the molecular weight of the prepared polyether, and the coating performance of the molecules of the slump retaining agent is improved. The molecular branch chain of the slump retaining agent is a polyether branch chain which has good flexibility and hydrophilicity and shows the coating performance and high slump retaining performance of the slump retaining agent.

The invention provides a preparation method of a nano zirconium oxide powder dispersing agent and the nano zirconium oxide powder dispersing agent prepared by the method. The preparation method of the nano zirconium oxide powder dispersing agent comprises the following steps: synthesizing polyether from an alcohol head and a cyclic monomer under the action of a catalyst; reacting the polyether with a hydrophilic small monomer under the action of a reducing agent, an initiator and a chain transfer agent to prepare a polyether dispersant; and adding a neutralizing agent into the polyether dispersing agent to prepare the nano zirconium oxide powder dispersing agent. The total amount of the raw materials is 1000 parts by mass, the dosage of each raw material is as follows: 19.17-20.18 parts by mass of an alcohol head, 329.45-346.79 parts by mass of a cyclic monomer, 1.1-1.7 parts by mass of a catalyst, 31.38-33.43 parts by mass of a hydrophilic small monomer, 2.5-6.1 parts by mass of a reducing agent, 2.4-3.9 parts by mass of an initiator, 0.6-1.2 parts by mass of a chain transfer agent, 7.9-13.4 parts by mass of a neutralizing agent and the balance of water, the alcohol head is 3-allyloxy-1, 2-propylene glycol, the cyclic monomer is ethylene oxide and propylene oxide, and the hydrophilic small monomer is allyl trimethyl ammonium chloride.