Background and overview[1]
2-Carboxyethylphenylphosphinate can be used as a pharmaceutical synthesis intermediate.
Preparation[1-3]
Examples of application of 2-carboxyethylphenylphosphinate are as follows:
1) Preparing trimethylolpropane tris(2-carboxyethylphenylphosphinate), including the following steps: using trimethylolpropane and 2-carboxyethylphenylphosphinate as raw materials, in the catalyst Under the conditions that exist, the reaction is heated, and after the reaction is completed, it is poured into water and cooled to obtain the product; the molar ratio of the above-mentioned trimethylolpropane and 2-carboxyethylphenylphosphinate is 1:2.5~3.5; the above-mentioned catalyst is FeCl3 , SnCl2, SnCl4, Al2(SO4)3, MgCl2, CaCl2, Sb2O3, Sb(CH2COO)3, one or more of p-toluenesulfonic acid and concentrated sulfuric acid, the catalyst dosage is 0.5% of the mass of trimethylolpropane ~4%; the above reaction temperature is 80℃~260℃, and the reaction time is 10h~28h. The present invention adopts a “one-pot method” to prepare the plasticizer. The production process is simple and easy to control, which is conducive to large-scale production. In addition, no organic solvent is used in the entire production process, and it has obvious environmental protection.
2) Prepare a flame-retardant polyester fiber. The preparation method is: according to the FDY process, the modified polyester FDY filament, that is, the flame-retardant polyester fiber is prepared from the modified polyester melt; the preparation method of the modified polyester is: : Mix terephthalic acid, ethylene glycol, 2-carboxyethylphenylphosphinate, 2,5,6,6-tetramethyl-2,5-heptanediol and doped modified Bi2O3 powder evenly After that, the esterification reaction and the polymerization reaction of shrinkage cosmetic raw materials are carried out successively; the structural formula of 2,5,6,6?tetramethyl?2,5?heptanediol is: the dyeing of the prepared product at a temperature of 120℃ The rate is 85.3~89.2%, and the K/S value is 22.35~25.43; after placing 6 Rohm and Haas resin for 0 months at a temperature of 25°C and a relative humidity of 65%, its intrinsic viscosity dropped by 13~18% . The preparation method of the invention has low cost and simple process; the prepared product has excellent dyeing performance and natural degradation performance.
3) Prepare a reactive halogen-free flame retardant unsaturated polyester resin, which is characterized by: using diol, dibasic acid or dibasic acid anhydride, reactive phosphorus flame retardant 2-carboxyethylbenzene Phosphorous acid and phenylhydroxymethyl phosphorous acid, reactive silicon-based flame retardant diphenyldihydroxysilane, dihydroxydimethylsilane, etc. are used as basic raw materials, under the conditions of catalyst dibutyl tin oxide, sodium acetate, etc. , carry out esterification and polycondensation reaction, and then add diluent to make reactive halogen-free flame-retardant unsaturated polyester resin. The resin produced by the present invention is particularly suitable for the manufacture of unsaturated polyester resin molding compounds, fiberglass reinforced plastics and electrical plastic products. It can meet the flame retardant and lightweight requirements of the products and has good performance.
Main reference materials
[1] CN201110262755.5 Preparation method of trimethylolpropane tris(2-carboxyethylphenylphosphinate)
[2] CN201811614012.8 Flame-retardant polyester fiber and preparation method thereof
[3] CN201110088083.0 A synthesis method of reactive halogen-free flame-retardant unsaturated polyester resin
