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A kind of polyoxymethylene composition and preparation method thereof

A polyoxymethylene composition and polyoxymethylene technology are applied in the field of materials, 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: 2017-04-12
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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  • A kind of polyoxymethylene composition and preparation method thereof
  • A kind of polyoxymethylene composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Firstly, the polyoxymethylene and hollow glass microbeads are respectively placed in a blast oven with a temperature range of 80-90℃ to dry for 3-4 hours.

[0045] (1) Add 100 parts by mass of polyoxymethylene (its melt index is 3g / 10min, and the measurement conditions are: 190℃, 2.16kg load), 0.2 parts of commercially available white oil is added to the high-speed mixer and mixed 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 into the high-speed mixer to mix, and mix well;

[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 added to the extruder through side feeding, and then extruded and granulated. , The screw speed is 280 rpm, 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 Zone

...

Embodiment 2

[0051] First, the polyoxymethylene and hollow glass beads are placed in a blast oven with a temperature range of 80-90℃ to dry for 3-4 hours.

[0052] (1) Add 100 parts by mass of polyformaldehyde (its melt index is 12g / 10min, and the measurement conditions are: 190℃, 2.16kg load), and 0.1 part of commercially available white oil is added to the high-speed mixer and mixed 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 into the high-speed mixer and mix well. well mixed;

[0053] (2) Melt and blend the uniformly mixed raw materials in step (1) with a vented co-rotating twin-screw extruder. 15 parts of hollow glass microspheres are added to the extruder through side feeding, and extruded and granulated. , The screw speed is 210 revolutions / minute, and the barrel temperature (temperature / °C) is:

[0054] Hopper Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 ...

Embodiment 3

[0058] Firstly, the polyoxymethylene and hollow glass microbeads are respectively placed in a blast oven with a temperature range of 80-90℃ to dry for 3-4 hours.

[0059] (1) Add 100 parts by mass of polyoxymethylene (its melt index is 18g / 10min, and the measurement conditions are: 190℃, 2.16kg load), 0.2 parts of commercially available white oil is added to the high-speed mixer and mixed for 1-2min , Then add 0.8 parts of calcium stearate, 0.3 parts of antioxidant 2246, 0.6 parts of antioxidant 168, 0.5 parts of melamine, and 0.2 parts of titanium dioxide into the high-speed mixer to mix, and mix well;

[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 added to the extruder through side feeding, and extruded into granules. , The screw speed is 250 rpm, 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 ...

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Abstract

The invention belongs to the technical field of materials, and relates to a polyoxymethylene resin composition and a preparation method thereof. The polyoxymethylene composition is made of the following components by weight: 100 parts of polyoxymethylene, 5-15 parts of hollow glass microspheres, 0.1-0.2 part of white oil, 0.5-1 part of calcium stearate, 0.3-0.6 part of primary antioxidant, 0.3-0.6 part of auxiliary antioxidant, 0.5-0.8 part of formaldehyde absorbent, and 0.1-0.3 part of nucleating agent. Compared with the prior art, the polyoxymethylene composition prepared by the present invention has the characteristics of low density, low shrinkage rate, good surface quality, high whiteness, good rigidity and small 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 its crystallinity is as high as 70%-80%, resulting in high density and high shrinkage, which limits the accuracy of POM in some dimensions. Applications for demanding lightweight parts. [0003] Deng Cong ("Polymer Materials and Engineering", 2005, 21(3):160-163, the structure and properties of hollow glass beads filled and modified POM), studied the influence of the content and particle size of glass beads on POM / glass The influence of the microbead composite system on the mechanical properties, fluidity and dispersion morphology, etc., but did not mention the hollow glass microbead feeding method, the hollow glass microbead on the material density and shrinkage rate. [00...

Claims

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Application Information

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Patent Type & Authority Patents(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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