Preparation method for in situ filled semi-aromatic polyamide composite material
A technology of semi-aromatic polyamide and composite materials, which is applied in the field of preparation of in-situ filled semi-aromatic polyamide composite materials, can solve the problems of complex resin synthesis process and high energy consumption, and achieve rich variety, high mechanical strength and experimental repeatability Good results
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Embodiment 1
[0029] Put 5000g of semi-aromatic polyamide prepolymer (prepared by the weight ratio of terephthalic acid: adipic acid: hexamethylenediamine=83:73:116), 50g of phosphoric acid, 5000g of calcium carbonate and 10g of benzoic acid into the reaction extruder , Reactive extrusion at a temperature of 315 ° C, a screw speed of 130 rpm and a vacuum of 0.07 MPa; the extrudate was drawn, cooled, pelletized and dried to obtain an in-situ filled semi-aromatic polyamide composite material with a yield of 93%. Strength 97MPa, bending strength 219MPa, unnotched impact strength 54kJ / m 2 .
Embodiment 2
[0031] Add 1000g of semi-aromatic polyamide prepolymer (prepared by weight ratio of hexamethylenediamine terephthalate: caprolactam = 141:59), 1g of pyrophosphate, 10g of silicon dioxide and 1g of p-toluic acid for reaction extrusion Machine, reaction extrusion at a temperature of 330 ° C, a screw speed of 20 rpm and a vacuum of 0.08 MPa; the extrudate was drawn, cooled, pelletized and dried to obtain an in-situ filled semi-aromatic polyamide composite material with a yield of 95%. Tensile strength 82MPa, bending strength 180MPa, unnotched impact strength 67kJ / m 2 .
Embodiment 3
[0033] Semi-aromatic polyamide prepolymer (prepared by weight ratio of 4,4'-(4-thioetherbenzoic acid)-triphenylphosphine oxide:decanediamine:cycloenantholactam=582:172:46) 4000g , 35g of polyphosphoric acid, 15g of silicon dioxide, 70g of titanium dioxide and 7g of m-toluic acid are added to the reaction extruder, and the reaction is extruded at a temperature of 290°C, a screw speed of 200rpm and a vacuum of 0.09MPa; the extrudate is drawn, After cooling, pelletizing and drying, an in-situ filled semi-aromatic polyamide composite material was obtained, with a yield of 92%, a tensile strength of 88MPa, a flexural strength of 191MPa, and an unnotched impact strength of 55kJ / m 2 .
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