6 results about "Butanediol" 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 composite degradation material of aluminum hydroxide-poly-butylene succinate and a preparation technology thereof, the composite degradation material is made by blending and extruding the materials of aluminum hydroxide and the poly-butylene succinate, etc. and an addition agent; the weight percentage is as follows: 40 to 50 percent of the aluminum hydroxide, 35 to 50 percent of the poly-butylene succinate, 5 to 10 percent of polylactic acid, 5 to 10 percent of starch and1.5 percent of the addition agent. The composite degradation material can reduce the production cost of the degradation materials, improve the performance of products and can be widely applied in fields such as toys, electronics and industrial packaging, etc.

The invention relates to a PBT (polybutylene terephthalate) production technique. The technique comprises the following steps: carrying out liquid-phase tackifying on 1,4-butanediol, terephthalic acid and a catalyst to obtain PBT with the viscosity of 1.05-1.35 dL/g; in the liquid-phase tackifying process, adding a nucleating agent which accounts for 0.02-1 wt% of the raw materials, and uniformly mixing; and after the liquid-phase tackifying, adding a lubricant which accounts for 0.02-1 wt% of the raw materials, and uniformly mixing. In the liquid-phase tackifying process, 0.02-1 wt% of the nucleating agent is added and uniformly mixed, thereby having great effects on enhancing hardness and side pressure resistance; and after the liquid-phase tackifying, 0.02-1 wt% of the lubricant is added and uniformly mixed to enhance the surface smoothness of the loose tube, so that the pipe diameter is uniform and stable.

The invention provides a method for synthesizing heat-resistant polyurethane based on soybean oil. The method comprises the following steps in sequence: adding the soybean oil and a catalyst to a reactor; adding polyisocyanates to react to obtain a polyurethane prepolymer; adding 1, 4-butanediol and polyol oligomer containing the same hydroxy based on mole to the polyurethane prepolymer; fully stirring for 1 to 3 minutes; and tabletting through a vulcanizing machine so as to obtain polyurethane. The method for synthesizing heat-resistant polyurethane based on soybean oil has the characteristics of being simple in process and easy to operate.