Main applications of terephthalic acid_Kain Industrial Additives

Background and overview^[1]

Terephenylenediboronic acid can be used as a pharmaceutical synthesis intermediate.

Preparation^[1]

Terephenylene diboric acid is prepared as follows:

Compound m (8.87g, 37.6mmol) was dissolved in tetrahydrofuran (140mL), and hexane solvent and 2.5M n-butyllithium (18mL, 45.1mmol) were added dropwise at -78°C, followed by stirring for 1 hour. After slowly adding trimethyl borate (13 mL, 56.4 mmol) dropwise, stir for 2 h. Then 2M hydrochloric acid was added dropwise to neutralize, and the product was extracted with ethyl acetate and water. Recrystallization from dichloromethane and hexane gave compound terephthalic acid n (2.93 g, 47%).

Apply^[2-4]

Examples of applications of terephthalic acid are as follows:

1) Preparing a composite nanofiber material with photoelectromagnetic properties, which relates to a method for preparing a composite nanofiber material with photoelectromagnetic properties. Method: 1. Preparation of water-soluble polyfluorene (PF-Na): polyfluorene monomer is synthesized through 2,7-dibromofluorene and 1,3-dibromopropane; polyfluorene monomer is synthesized through terephthalediboric acid and polyfluorene monomer. 9,9-bis(3-bromopropyl)-2-phenylfluorene PF; synthesis of water-soluble polyfluorene PF-Na through PF and thioglycolic acid; 2. Synthesis of water-soluble Fe3O4 nanoparticles by hydrothermal method; 3. Wet method Hybrid electrospinning method was used to prepare composite nanofiber materials with photoelectromagnetic properties. The invention is used to prepare composite nanofiber materials with photoelectromagnetic properties.

2) Prepare a natural plant dye, including the following raw materials by weight: 40-60 parts by weight of starch, 30-50 parts by weight of rosewood, 8-18 parts by lithospermum, 15-35 parts by perilla, and 10-20 parts by sodium sulfite. 5-10 parts of butyl acetate, 12-18 parts of potassium dichromate, 14-20 parts of pyrazoline derivatives, 1-5 parts of polydimethylsiloxane, and 4-10 parts of terephthalic acid. The preparation method of the invention is simple, the prepared dye has strong practicability, is more environmentally friendly, has greatly improved tinting power, and is suitable for promotion.

3) Prepare a water-saving dyeing auxiliary, including the following components by weight: 10-25 parts of borax, 22-35 parts of terephthalic acid, 1-23 parts of acrylic acid amide, diphosphate 15-24 parts of sodium hydrogen, 45-68 parts of montmorillonite, 3-5 parts of yttrium oxide, 5-10 parts of triglycerides, 12-18 parts of chitosan, 12-18 parts of sodium sulfate, 1-1 part of tea polyphenols 4 parts, triethylene glycol monobutyl ether 16-21 parts, sodium alkyl succinate sulfonate 22-45 parts, polyethylene glycol 1-5 parts, p-methylaniline 1-8 parts, polystyrene 10 parts -18 parts, solubilizer 0.1-0.5 parts, sodium tripolyphosphate 1-3 parts, aluminum foam 8-12 parts, stabilizer 1-5 parts. The auxiliary agent of the invention has a reasonable formula, improves the dye uptake rate and color fastness, and improves the dyeing uniformity of fabrics. In addition, the preparation method is simple and the equipment requirements during dyeing are low, so it has good market prospects.