Polyoxymethylene composition and preparation method thereof
A polyoxymethylene composition and a polyoxymethylene technology are applied in the material field, which can solve the influence of the density and shrinkage rate of the hollow glass microsphere material without mentioning the feeding method of the hollow glass microspheres, and the appearance quality of the shrinkage anisotropic injection molding products. , can not meet the problems of special applications, etc., to achieve the effect of environmental protection, beautiful color, small broken rate
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Embodiment 1
[0044] The polyoxymethylene and the hollow glass microspheres are firstly dried in a blast oven with a temperature range of 80-90° C. for 3-4 hours.
[0045] (1) Add 100 parts by mass of polyoxymethylene (its melt index is 3g / 10min, the measurement conditions are: 190°C, 2.16kg load), 0.2 parts of commercially available white oil into a high-speed mixer and mix for 1-2min , then add 0.5 part of calcium stearate, 0.4 part of antioxidant 245, 0.4 part of antioxidant 168, 0.5 part of melamine, and 0.1 part of zinc oxide are mixed in a high-speed mixer and fully mixed;
[0046] (2) Melt and blend the uniformly mixed raw materials in step (1) with a vented co-rotating twin-screw extruder, 5 parts of hollow glass microspheres are fed into the extruder through side feeding, and extruded to granulate , the screw speed is 280 rpm, and the barrel temperature (temperature / °C) is:
[0047] Hopper zone 1 zone 2 zone 3 zone 4 zone 5 zone 6 zone 7 zone 8 zone 9
[0048] Room temperature 16...
Embodiment 2
[0051] The polyoxymethylene and the hollow glass microspheres are firstly dried in a blast oven with a temperature range of 80-90° C. for 3-4 hours.
[0052] (1) Add 100 parts by mass of polyoxymethylene (its melt index is 12g / 10min, the measurement conditions are: 190°C, 2.16kg load), 0.1 part of commercially available white oil into a high-speed mixer and mix for 1-2min , then add 1 part of calcium stearate, 0.3 part of antioxidant 1010, 0.6 part of antioxidant 168, 0.8 part of melamine formaldehyde condensate, 0.3 part of light magnesium oxide and add in high-speed mixer and mix, fully well mixed;
[0053] (2) Melt and blend the uniformly mixed raw materials in step (1) with a vented co-rotating twin-screw extruder, and add 15 parts of hollow glass microspheres into the extruder through side feeding, and extrude to granulate , the screw speed is 210 rpm, and the barrel temperature (temperature / °C) is:
[0054] Hopper zone 1 zone 2 zone 3 zone 4 zone 5 zone 6 zone 7 zone 8...
Embodiment 3
[0058] The polyoxymethylene and the hollow glass microspheres are firstly dried in a blast oven with a temperature range of 80-90° C. for 3-4 hours.
[0059] (1) Add 100 parts by mass of polyoxymethylene (its melt index is 18g / 10min, the measurement conditions are: 190°C, 2.16kg load), 0.2 parts of commercially available white oil into a high-speed mixer and mix for 1-2min , then add 0.8 part of calcium stearate, 0.3 part of antioxidant 2246, 0.6 part of antioxidant 168, 0.5 part of melamine, and 0.2 part of titanium dioxide are mixed in a high-speed mixer and fully mixed;
[0060] (2) Melt and blend the uniformly mixed raw materials in step (1) with a vented co-rotating twin-screw extruder, 10 parts of hollow glass microspheres are fed into the extruder through side feeding, and extruded to granulate , the screw speed is 250 rpm, and the barrel temperature (temperature / °C) is:
[0061] Hopper zone 1 zone 2 zone 3 zone 4 zone 5 zone 6 zone 7 zone 8 zone 9
[0062] Room tempe...
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