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Polyetheretherketone (PEEK) is prepared by nucleophilic substitution. It is prepared by carrying out polycondensation reaction of 4,4'-difluorobenzophenone and hydroquinone in diphenylsulfone solvent under the action of alkali metal carbonate.
The polycondensation reaction is carried out at a temperature of 150 ° C to 340 ° C. The initial reaction temperature should be low to avoid loss of hydroquinone and reduce side reactions. The temperature was then slowly raised, the polymer was dissolved in the solvent, and the reaction was completed at 320 ° C.
The molecular weight of the polymer depends on the molar ratio of difluorobenzophenone to hydroquinone. The two are usually equimolar. If the former is slightly excessive, the polymer contains fluorine end groups. The fluorine end group has better thermal stability than the phenol end group.
The alkali metal carbonate is usually a mixture of potassium carbonate and sodium carbonate, and the amount is 1 mol of hydroquinone at least 2 mol (the alkali metal carbonate corresponds to a light group corresponding to at least one alkali metal atom). If the ratio of alkali metal carbonate to terephthalate is too low, the polymer will be brittle; if the ratio is too high, it will cause a series of side reactions and affect the product performance.
The polycondensation reaction is performed in a stainless steel reactor with a stirring device. Add the raw material difluorobenzophenone, hydroquinone and solvent diphenylsulfone (the amount is about 2 to 3 times the amount of difluorobenzophenone) into the polymerization reactor, pass nitrogen and heat up to 180 ° C, add The mixture of anhydrous potassium carbonate and sodium carbonate was heated to 200 ° C for 1 hour, and then heated to 250 ° C for 15 minutes, and finally heated to 320 ° C for 2.5 hours. The reactants were discharged from the reactor and cooled to a retention tank. The polymer crystallizes out together with inorganic salts, sodium fluoride, potassium fluoride, and diphenylsulfone. The carbon dioxide and nitrogen generated during the reaction are vented after being condensed.
After the polymer in the tank was pulverized, it was sieved with a fine sieve with a hole diameter of 500pm, then sent to an extractor and extracted with acetone. The suspension was filtered through the first and second filter presses, and the precipitate was washed with acetone to remove diphenylsulfone . The filtrate was sent to a crystallizer, and diphenylsulfone and acetone were recovered. The filter cake was sent to a water washing tank and washed with water to remove the inorganic salt in the polymer. After the suspension is filtered by the third and fourth filter presses, the filtrate is sent to the solvent for recovery, and the filter cake after the filter press is sent to a dryer for drying to obtain a product.
  • Product Name:Poly Ether Ether Ketone PEEK Powder
  • Synonyms: 4,4’-Difluorobenzophenone,hydroquinonepolymer;
    Poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene) average Mw ~20,800, average Mn ~10,300 
  • Molecular Formula:[OC6H4OC6H4COC6H4]n 
  • CAS No.:29658-26-2;31694-16-3 
  • Property:Polyether ether ketone (PEEK) is a colourless organic thermoplastic polymer in the polyaryletherketone (PAEK) family, used in engineering applications.
  • partical size(D50):from 650 mesh--20 mesh
  • Applications The PEEK powder can be used the processing method such as extrusion molding.
  • Type: PEEK SY70P,PEEK SY50P and PEEK SY30P.the most difference of them are the melt flow index as follows:
Test condition
Melt flow index
380℃ , 5kg
g 10min-1

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