4 results about "Diol" patented technology

The invention discloses a preparation method of a waterborne polyurethane emulsion and the waterborne polyurethane emulsion prepared by the preparation method. The preparation method comprises the following steps: (1) synthesizing a polyurethane prepolymer: mixing and dehydrating polypropylene oxide polyether glycol and polycarbonate diol, dropwise adding toluene diisocynate after dehydrating for heat-preserving reaction, and finally dropwise adding prepared mixed solution of dihydroxybutyric acid, 1, 4-butanediol and acetone for heat-preserving reaction to finally prepare the prepolymer; (2) adding aminoalkyl silicon oil, an inner crosslinking agent and hydroxy-propyl acrylate to modify; (3) neutralizing to salify: dropwise adding an acetone solution of a neutralizer triethylamine into the modified prepolymer prepared in the step (2) for reaction so as to prepare a polyurethane salified solution; and (4) dissolving disulfamate and a diamido chain extender in water, quickly adding to the polyurethane salified solution which is stirred at a high speed, quickly dispersing and extending chains, and heating the emulsion to remove the solvent through evaporation to obtain the waterborne polyurethane emulsion.

The invention discloses a purification method of 1,2-propylene amide. One from dihydric alcohol having 2-5 carbon atoms and triatomic alcohol having 2-5 carbon atoms or one from alcohol amines having 2-5 carbon atoms or dimethylsulfoxide or N-methyl-2-pyrrolidone is used as an extraction agent. A crude product of the 1,2-propylene amide and the extraction agent enter an extraction tower for extraction, then water are collected at tower top of the extraction tower. Kettle bottom material of the extraction tower enters a rectifying tower for rectification, then the 1,2-propylene amide is collected at tower top of the rectifying tower. Through use of the method, the 1,2-propylene amide and the water are separated in the process of preparation. Through use of the extraction agent, height of the tower and reflux ratio can be decreased and separation efficiency is enhanced. The extraction agent can be reused through simple separation, so that the energy consumption is greatly reduced and the production cost is also reduced. The method has the advantage of high separation efficiency, high purity of purification products, colorless and transparent products, and recycling extraction agent.

The invention relates to a method for dyeing a polyester fiber type material by using an oligomer removing agent. The method comprises the following step: adding the oligomer removing agent and a dyeing assistant into a dyeing bath together to dye the polyester fiber type material, wherein the formula of the oligomer removing agent comprises the following raw materials: 10-20 parts of dicarboxylic acid di(C1-C4) alkyl ester, 14-26 parts of aromatic di(C1-C4) carboxylic acid, 30-50 parts of aliphatic diol or aliphatic polyol, 10-20 parts of difunctional sulfonated monomer, 10-30 parts of polyether and 15-100 parts of polyoxyethylene sorbitan fatty acid ester. According to the method provided by the invention, by adding polyoxyethylene sorbitan fatty acid ester, good synergy is realized, the dispersion performance of a dyeing solution is enhanced, the adsorption of a condensed matter in the dyeing solution to the surface of fiber can be better inhibited, and the problems caused by a polyester oligomer in a dyeing process are further solved. Thus, the dyeing of fabric is uniform, the color fastness is improved, and the stability of a product is enhanced.

The invention discloses a novel moisture-curing flame-retardant polyurethane hot melt adhesive and a preparation method thereof. The novel moisture-curing flame-retardant polyurethane hot melt adhesive is characterized by being prepared from 1-20 parts of polyether diols, 1-35 parts of liquid polyester diols, 1-40 parts of flame-retardant polyether glycol, 1-35 parts of crystalline polyester diols, 1-35 parts of an isocyanate-containing modified polyacrylic acid fluorosilicone copolymer, 1-50 parts of isocyanate, 0.01-1 part of a catalyst, 0.01-1 part of an antioxidant and 0.1-2 parts of a silane coupling agent. The isocyanate-containing modified polyacrylic acid fluorosilicone copolymer is synthesized firstly, the chemical structure of the copolymer is poly(hexafluorobutyl acrylate-random-monomethacryloxypropyl terminated polydimethylsiloxanes-random-methyl acrylate-random-isocyanatoethyl methacrylate, the copolymer is added to a polyurethane prepolymer and subjected to condensation polymerization, a fluorosilicone-containing acrylate copolymer chain segment and a reaction type flame retardant are introduced and have an efficient synergistic effect, and therefore, comprehensive chemical resistance, oil resistance, water resistance and flame retardance are improved.