A kind of biphenyl polyether sulfone resin containing methoxy biphenyl ether group and its synthesis method and application

Abstract

Disclosed are a methoxydiphenyl ether-containing biphenyl polyethersulfone resin, a synthesis method for same, and applications of same, the structural formula thereof being: [see drawing], where R1, R2, and R3 respectively and independently represent H and –OCH3, two of R1, R2, and R3 are simultaneously H, while the remaining one is –OCH3, and n = 2-2000. The synthesis method has component A: 4,4'-dihydroxybiphenyl, component B: 4,4'-dichlorodiphenylsulfone, and component C: a methoxybiphenyl metal phenate as reacting monomers, has an alkali metal carbonate as a salt-forming agent, and employs a solution polymerization technique for polymerization. With the introduction of methoxybiphenyl metal phenate monomer as a capping agent into a PPSU polymer, the methoxydiphenyl ether-containing biphenyl polyethersulfone resin so prepared has a chlorine content less than 900 ppm, transmittance greater than 83%, haze less than 3%, yellowness index less than 15, has significantly improved transparency and color levels, and at the same time, has the characteristic of resistance to high temperature over an extended period of time without discoloration.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a biphenyl polyether sulfone resin containing methoxy biphenyl ether group and its synthesis method and application. Background technique [0002] One of the monomers used in the production of commercially available biphenyl polyethersulfone (PPSU) is dichlorodiphenyl sulfone, and for thermal stability and molecular weight considerations, the end groups of the polymer chains contain chemical bond chlorine, and the general content is between Above 3000ppm. The content of polymer-bonded halogens, especially chlorine, is too high for many applications due to the potential for corrosion of metals and is generally not acceptable for flame retardancy. Applications in the electronics field, such as switches, circuit breakers, fuses, IC holders, housings, foils, typically require very low chlorine levels, eg less than 900 ppm. In addition, known biphenylpolyethers...

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Problems solved by technology

In addition, known biphenylpolyethersulfone polymers also have a high residual solvent content

[0003] Patent CN102365312B discloses a preparation method for preparing PPSU with low chlorine content. By adding monochlorodiphenyl sulfone, the effect of reducing the content of chlorine end groups to below 800ppm can be achieved, and at the same time, the elongation at break and the PPSU under low shear can be improved. Fluidity, but studies have found that monochlorodiphenyl sulfone has low activity and will produce more unreacted monomer residues, and it is not easy to be removed during the post-treatment purification process, resulting in deterioration of the heat resistance and color of the resin. Obvious changes, and at the same time, bubbles will be generated due to gasification of small molecules, which will bring hidden dangers to normal use

The method for preparing PPSU published in patent CN 102498158 A is to prepare a resin with a chlorine end group content of less than 400 ppm and a lighter color by adding an aqueous metal hydroxide solution in the later stage of polymerization, but this preparation process is difficult to control stably and exist Potential safety hazard, because during the polymerization stage, the material system is at a high temperature higher than 190°C. If an aqueous solution is added, a large amount of water vapor and high-temperature materials will be splashed or even sprayed out of the polymerization equipment

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