41results about How to "Promote polycondensation reaction" patented technology

The invention discloses a method for preparing a polyester containing isosorbide, comprising the following steps of: carrying out dehydration reaction on raw materials including isosorbide and dicarboxylic acid which have equal molar weight under the action of a polycondensation catalyst and a water-carrying agent under normal pressure, and carrying out a vacuum polycondensation to prepare the polyester containing isosorbide, wherein the water-carrying agent comprises one or more of the methyl isopropyl ketone, ethyl isopropyl ketone, methyl isobutyl ketone, diisopropyl ketone and diisobutyl ketone. According to the method, an appropriate amount of water-carrying agent is added during the direct esterification reaction of the isosorbide and the binary acid, thus the reaction temperature is decreased greatly, and the molecular weight and the polymerization efficiency of the polyester are improved.

The invention belongs to the technical field of urea-formaldehyde resin preparation, and particularly relates to a preparation method of a nano silicon dioxide / rosin modified urea-formaldehyde resin. The method comprises the following steps: preparing a urea-formaldehyde resin from urea and formaldehyde by a weak alkali-weak acid-weak alkali technique, and modifying with nano silicon dioxide and rosin to obtain the nano silicon dioxide / rosin modified urea-formaldehyde resin. The method has the advantages of simple technique and accessible raw materials, and is suitable for industrialized mass production. The prepared urea-formaldehyde resin has the advantages of favorable viscosity, high softening point, low free formaldehyde content, environment friendliness, higher water resistance, favorable toughness and improved aging resistance, is suitable for artificial board production, and can be used as an adhesive in material binding, bamboo / wood processing, paper binding, steel paints, multicolor pattern paints and other industries.

The invention provides a production system for a nylon 66 salt water solution. The system comprises a plurality of reaction units, control systems corresponding to the reaction units and a maturation tank. The reaction units comprises reactors, each reactor is provided with a material discharging pipeline and a plurality of material feeding pipelines, the material discharging pipeline of the reactor of the headmost reaction unit is communicated with the maturation tank, a circulating pipeline is arranged outside each reactor and used for making the bottom and the top of the reactor communicated, and each circulating pipeline is sequentially provided with a heat exchanger and a pump from front to back. The production system is suitable for the production requirements of nylon 66 salt with water as a solvent, flexible control over temperature, pH, concentration and other industrial parameters in the production process can be achieved, meanwhile, no by-products are generated, the water also becomes one part of the nylon 66 salt product, the storage stability of the nylon 66 salt is improved, and convenience is brought to the subsequent polycondensation reaction.

The invention discloses a high-toughness wear-resistant shock-absorbing cable for ships, which comprises a conductor, an insulating layer, a filling layer, a shielding layer, an armor layer and an outer sheath; the raw materials of the outer sheath include: butadiene rubber 50 ‑60 parts, EPDM rubber 20‑25 parts, chlorinated polyethylene 140B 15‑18 parts, high toughness and high heat insulation gel 8‑12 parts, sulfur powder 1‑1.5 parts, accelerator DM 1.4‑1.7 2.1-2.4 parts of accelerator TMTM, 5-7 parts of trioctyl trimellitate, 2-3.5 parts of tributyl citrate, 25-28 parts of barite powder, 17-20 parts of high wear-resistant carbon black, 12-15 parts of nano calcium carbonate, 7-10 parts of superfine talc, 6-9 parts of hard clay, 5-8 parts of kaolin, 2-4 parts of red phosphorus, 0.3-0.6 parts of NOBS, 0.5-1 parts of anti-aging agent RD parts, antioxidant RD 2.5‑4 parts.

The invention discloses a combined type pyrolysis and gasification furnace. The whole device comprises a horizontal furnace body, a vertical furnace body, a vapor leading device, a tar thermal cracking catalysis device and a cyclone dust removal device. The horizontal furnace body is perpendicularly communicated with the middle-lower portion of the vertical furnace body, the middle of the horizontal furnace body is communicated with the vapor leading device, and the other end of the vapor leading device is communicated with the middle-upper portion of the vertical furnace body. The lower end of the vertical furnace body is provided with a deslagging device, the interior of the upper end of the vertical furnace body is provided with the tar thermal cracking catalysis device which is communicated with the cyclone dust removal device through a combustible gas discharge pipeline. The horizontal furnace body is divided into a feeding section, a drying section and a pyrolysis and gasification section, the feeding section, the drying section and the pyrolysis and gasification section are combined into an inner-layer furnace body, the drying section and the pyrolysis and gasification section are combined into an outer-layer furnace body, the inner-layer furnace body stretches into the vertical furnace body, the outer-layer furnace body is connected with the barrel wall of the vertical furnace body, and the inner-layer furnace body and the outer-layer furnace body form an annular cavity. The combined type pyrolysis and gasification furnace is simple in structure, reasonable in design, high in continuous working capacity and high in pyrolysis and gasification efficiency.