Improved powders for additive manufacturing
A technology of powder and composition, which is applied in the field of preparing the composition of the present invention, and can solve problems such as loss of stability and insufficient combination
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Embodiment 1
[0182] Ortho-dichlorobenzene (1600 g) and 1,4-(phenoxybenzoyl)benzene (EKKE) (65 g) were placed in a 2 L reactor while stirring under a stream of dry nitrogen. The following acid chlorides were added: terephthaloyl chloride (5.4g), isophthaloyl chloride (22.2g) and benzoyl chloride (0.38g). The reactor was cooled to -5°C. Add AlCl 3 (115 g) while maintaining the temperature in the reactor below 5°C. After the homogenization period (approximately 10 minutes), the reactor temperature was increased at a rate of 5°C per minute to 90°C (during which the polymerization started). The reactor was held at 90°C for 30 minutes and then cooled to 30°C. 400 g of acidic water (3% HCl) was added slowly so that the temperature in the reactor did not exceed 90°C. The reactor was stirred for 2 hours and then cooled to 30°C.
[0183] The reaction medium is removed from the reactor and filtration / purification steps are carried out according to the person skilled in the art. Afterwards, the ...
Embodiment 2
[0185] The PEKK polymer flakes from Example 1 were appropriately ground and air classified to a fine powder. The data for the powders are shown in Table A.
[0186] Table A
[0187]
Embodiment 3
[0189] Polyetherketoneketone (PEKK) was prepared as in Example 1 and Example 2.
[0190] The powders were mixed according to Table 1 in a Henschel FML type mixer. The mass of the powder is hereinafter referred to as m. Stage 1 involves the heating stage, ie the stage until the mixture (powder) in the mixer reaches the maximum temperature Tmax. Tmax corresponds to the treatment temperature T B . The speed of the mixer in stage 1 is called D 1 . The duration of phase 1 is called t 1 . Phase 2 is the holding phase, ie the phase in which the temperature reached is maintained. The speed of the mixer in stage 2 is called D 2 . The duration of phase 2 is called t 2 .
[0191] The names m, Tmax, D are also used in the following examples 1 , D 2 , t 1 , t 2 .
[0192] The obtained bulk density S, BET surface, fraction (by volume percent) of powder particles with a particle size of 10 μm (“%<10 μm”) and the quantiles d10, d50 and d90 of the particle size distribution are...
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