A kind of 2,5-dihydroxyterephthaloyl chloride and preparation method thereof

Abstract

The invention discloses 2,5-dihydroxyterephthaloyl chloride, which can be used as an intermediate in organic synthesis and has very good application prospects in the fields of pharmaceutical synthesis, aromatic polyamides and functional polymer materials. Also discloses a preparation method of 2,5-dihydroxyterephthaloyl chloride, comprising the steps of: mixing 2,5-dihydroxyterephthalic acid with thionyl chloride, adding a catalyst under ultrasonic conditions and ultrasonically Reflux reaction, after reaction finishes, distill out sulfur oxychloride and catalyzer under reduced pressure, add ferric salt in the obtained crude 2,5-dihydroxy terephthaloyl chloride and carry out co-heating, then vacuum distillation obtains described high Purity 2,5‑Dihydroxyterephthaloyl chloride. The method can quickly and easily produce the target product with high efficiency and high purity, the reaction temperature is low, the time is shortened, the reaction condition is mild, the reaction equipment is simple, the yield is greatly improved, and the purity of the prepared product can be increased to more than 97%.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to 2,5-dihydroxyterephthaloyl chloride and a preparation method thereof. Background technique [0002] Aramid 1414, chemically known as poly-p-phenylene terephthalamide, was the first high-performance fiber of value and is still produced and used in large quantities. Aramid 1414 has the advantages of high strength (6 times the strength of steel), high temperature resistance, solvent corrosion resistance, and excellent dielectric properties. It is usually used as short fibers, soft wires, nets, fabrics, etc. Reinforcement materials exert their high performance and can be used as reinforcement materials such as glass fibers, steel fibers, and steel bars. However, due to the lack of active groups on the surface of aramid 1414 fiber and strong inertness, it causes defects such as low compressive strength and weak bonding force between the surface and resin, which restric...

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Problems solved by technology

However, due to the lack of active groups on the surface of aramid 1414 fiber and its strong inertness, it causes defects such as low compressive strength and weak bonding force between the surface and resin, which restricts the popularization and application of aramid 1414 fiber; in addition, aramid 1414 fiber is in the Under UV radiation, the ends of the polymer chains on the fiber surface will be oxidized in the air, and the crystal structure on the fiber surface will be rearranged, resulting in erosion of the fiber surface, resulting in degradation, aging and deterioration of the material, which will lead to a gradual decline in the mechanical properties of the product, resulting in become brittle, cracked and yellowed or completely destroyed and unusable

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