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

Active Publication Date: 2014-05-21
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyoxymethylene (POM), known as "Saigang", is an engineering plastic with excellent comprehensive properties, but due to its high crystallinity of 70%-80%, it has a high density and high shrinkage, which limits the accuracy of POM in some dimensions. Applications in demanding lightweight parts
[0003] Deng Cong ("Polymer Materials and Engineering", 2005, 21(3):160-163, Structure and performance of hollow glass microspheres filled modified POM), studied the effect of glass microsphere content and particle size on POM / glass The influence of the mechanical properties, fluidity and dispersion form of the microbead composite system, but did not mention the feeding method of the hollow glass microspheres, and the influence of the hollow glass microspheres on the density and shrinkage of the material
[0004] At present, there are many glass fiber reinforced POM products on the market. The addition of glass fiber can greatly reduce the shrinkage rate of the material, but it will also increase the density of the material, and cause problems such as shrinkage anisotropy and the appearance quality of injection molded products.
[0005] On the other hand, multinational companies in the POM industry, Ticona of the United States and Japan Polyplastics sell glass beads filled with POM grades. The glass beads used in the POM grades are all solid beads. Although the shrinkage rate of the material is small and the surface quality is good, however, The density is generally high and cannot meet special applications

Method used

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  • Polyoxymethylene composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

Belonging to the technical field of materials, the invention relates to a polyoxymethylene resin composition and a preparation method thereof. The polyoxymethylene composition comprises the following components by weight: 100 parts of polyoxymethylene, 5-15 parts of hollow glass beads, 0.1-0.2 part of white oil, 0.5-1 part of calcium stearate, 0.3-0.6 part of a main antioxidant, 0.3-0.6 part of an auxiliary antioxidant, 0.5-0.8 part of a formaldehyde absorbent, and 0.1-0.3 part of a nucleating agent. Compared with the prior art, the polyoxymethylene composition prepared by the invention has the characteristics of low density, low shrinkage, good surface quality, high whiteness, good rigidity, and low bead breakage rate.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a polyoxymethylene resin composition and a preparation method thereof. Background technique [0002] Polyoxymethylene (POM), known as "Saigang", is an engineering plastic with excellent comprehensive properties, but due to its high crystallinity of 70%-80%, it has a high density and high shrinkage, which limits the accuracy of POM in some dimensions. Applications in demanding lightweight parts. [0003] Deng Cong ("Polymer Materials and Engineering", 2005, 21(3):160-163, Structure and performance of hollow glass microspheres filled modified POM), studied the effect of glass microsphere content and particle size on POM / glass The influence of the mechanical properties, fluidity and dispersion form of the microbead composite system, but did not mention the feeding method of the hollow glass microspheres, and the influence of the hollow glass microspheres on the density and shrinkag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08K13/06C08K9/06C08K7/28C08K5/098C08K5/3492C08K5/01C08K3/22B29C47/92B29C48/92
CPCB29C48/04
Inventor 王贻孙
Owner HEFEI GENIUS NEW MATERIALS
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