Method for purifying polyphenylene sulfide
A purification method and technology of polyphenylene sulfide, applied in the field of purification treatment after polyphenylene sulfide synthesis, can solve the problems of inability to improve the mechanical properties of polyphenylene sulfide resin products, and inability to fully remove low-molecular-weight impurities
Pending Publication Date: 2022-03-18
ZHUHAI CHANGXIAN CHEM TECH
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Problems solved by technology
In this method, the alkali metal ions can be reduced compared with the case where no acid is added, but since the low-molecular-weight impurities cannot be sufficiently removed, the mechanical properties of the polyphenylene sulfide resin product molded products obtained by this method, such as bending elongation, cannot be improved. Length
Method used
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Experimental program
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Effect test
Embodiment 1
[0068] 1. Dry the above-mentioned polymerized slurry through a centrifuge until the drying rate reaches 85%. 2. Add the dried solid material into a container containing 1,3-dimethyl-2-imidazolidinone solvent, then stir at 120°C for 40 minutes, and filter while it is hot. 3. Filter with a centrifuge, and wash the filter layer 3 times with deionized water at 80°C. 4. Wash with deionized water at 30°C for 3 times, and dry the solid separated with a centrifuge at 120°C for 12 hours.
[0069] According to the present invention, polyphenylene sulfide having a reduced content of low-molecular-weight impurities and a reduced content of metal ions can be easily obtained.
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The invention provides a polyphenylene sulfide purification treatment method, which comprises the following steps of: filtering a solid-liquid mixture after a polyphenylene sulfide polymerization reaction is finished, and adding a 1, 3-dimethyl-2-imidazolinone organic polar solvent for purification treatment, so that low-molecular-weight impurities and alkali metal ions in the solid-liquid mixture can be removed in a targeted manner; the purified polyphenylene sulfide resin is obtained, and high-purity polyphenylene sulfide with excellent heat resistance and molding processing performance is obtained. According to the polyphenylene sulfide purification treatment method, after a polyphenylene sulfide synthesis reaction is completed, a solid component is obtained through solid-liquid separation, then a 1, 3-dimethyl-2-imidazolinone organic polar solvent is added into the solid component, then solid-liquid separation is conducted to obtain a solid component, and the solid component is purified through water washing, drying and other treatment. The content of low-molecular-weight impurities and the amount of metal ions in polymerization can be effectively reduced at the same time.
Description
【Technical field】 [0001] The invention relates to the technical field of polyphenylene sulfide synthesis, in particular to a purification treatment method after synthesis of polyphenylene sulfide. 【Background technique】 [0002] Polyphenylene sulfide is an excellent engineering resin with excellent heat resistance and chemical resistance, and has attracted attention as a component of electrical and electronic equipment. In addition, it can be molded into various molded parts, films, sheets, fibers, etc. by injection molding, extrusion, and is widely used in fields requiring heat resistance and chemical resistance. [0003] Polyphenylene sulfide is usually prepared by reacting a dihaloaromatic compound with an alkali metal sulfide, such as sodium sulfide, in an organic polar solvent such as N-methylpyrrolidone. In the process of polyphenylene sulfide synthesis, a large amount of alkali metal ions and low molecular compounds caused by the presence of sodium sulfide are produc...
Claims
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Login to View More IPC IPC(8): C08G75/0281
CPCC08G75/0281
Inventor 张德明杨伟明
Owner ZHUHAI CHANGXIAN CHEM TECH