Polyformaldehyde composition, polyformaldehyde material with low corrosion to metal and preparation method of polyformaldehyde material
The technology of a polyoxymethylene composition and a polyoxymethylene material is applied in the field of polyoxymethylene material and its preparation, which can solve the problems of poor absorption effect of formaldehyde and formic acid, mold scale and corrosion of processing equipment, etc., and achieves easy industrial application, reduced corrosion, Simple preparation method
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Embodiment 1
[0036] Add copolymerized polyoxymethylene resin, formaldehyde absorbent, antioxidant, acid absorbent A, acid absorbent B, lubricant and crystallization nucleating agent according to the weight parts shown in Table 1 into a high-speed mixer for premixing, and then use double The polyoxymethylene material with low metal corrosion is obtained after the screw extruder performs melting, mixing, extruding and granulating. Among them, the processing temperature is 225°C, and the screw speed is 100r / min; the twin-screw extruder used is a large-capacity evaporation (multi-stage exhaust) devolatilization twin-screw unit with a length-to-diameter ratio of 65:1. The vacuum degree of each exhaust section of the screw extruder is -0.08MPa.
[0037] In this embodiment, the melting index of the polyoxymethylene resin used is 9g / 10min; The formaldehyde absorbent is melamine; base) propionate; acid absorbent A is calcium oxide with an average particle size of 8 μm; acid absorbent B is Mg 0.8 ...
Embodiment 2
[0039] Add copolymerized polyoxymethylene resin, formaldehyde absorbent, antioxidant, acid absorbent A, acid absorbent B, lubricant and crystallization nucleating agent according to the weight parts shown in Table 1 into a high-speed mixer for premixing, and then use double The polyoxymethylene material with low metal corrosion is obtained after the screw extruder performs melting, mixing, extruding and granulating. Among them, the processing temperature is 225°C, and the screw speed is 100r / min; the twin-screw extruder used is a large-capacity evaporation (multi-stage exhaust) devolatilization twin-screw unit with a length-to-diameter ratio of 65:1. The vacuum degree of each exhaust section of the screw extruder is -0.08MPa.
[0040] In this embodiment, the melting index of the polyoxymethylene resin used is 9g / 10min; The formaldehyde absorbent is melamine cyanurate; phenyl) propionate; Acid absorbent A is calcium oxide with an average particle size of 8 μm; Acid absorbent B...
Embodiment 3
[0042] Add copolymerized polyoxymethylene resin, formaldehyde absorbent, antioxidant, acid absorbent A, acid absorbent B, lubricant and crystallization nucleating agent according to the weight parts shown in Table 1 into a high-speed mixer for premixing, and then use double The polyoxymethylene material with low metal corrosion is obtained after the screw extruder performs melting, mixing, extruding and granulating. Among them, the processing temperature is 225°C, and the screw speed is 100r / min; the twin-screw extruder used is a large-capacity evaporation (multi-stage exhaust) devolatilization twin-screw unit with a length-to-diameter ratio of 65:1. The vacuum degree of each exhaust section of the screw extruder is -0.08MPa.
[0043] In this example, the melting index of polyoxymethylene resin used is 9g / 10min; the formaldehyde absorbent is melamine; the antioxidant is N,N-bis-(3-(3,5-di-tert-butyl-4-hydroxyl Phenyl) propionyl) hexamethylenediamine; Acid absorbent A is calci...
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Abstract
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