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 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.