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A kind of toughened polyoxymethylene composition and preparation method thereof

A polyoxymethylene composition and polyoxymethylene technology are applied in the field of polymer materials, which can solve the problems of deterioration of polyoxymethylene performance, reduction of the amount of expensive elastomers, and high cost of high-toughness polyoxymethylene, so as to reduce the cost of raw materials, avoid the problem of mold scale, Good thermal stability

Active Publication Date: 2016-02-10
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Although blending with elastomer can greatly improve the notched impact strength of polyoxymethylene, but the tensile strength and rigidity of polyoxymethylene decrease greatly, and it is difficult to obtain polymers such as polyoxymethylene with a balance of rigidity and toughness, nano-rubber particles, etc. Although the toughness of polyoxymethylene can be improved, the price of nano-rubber particles is expensive, and the cost of high-toughness polyoxymethylene produced is relatively high
[0008] (2) Elastomer and inorganic nanoparticles toughened polyoxymethylene with structures such as coating, peeling, intercalation, etc., to realize the complementary performance advantages of elastomers and inorganic nanoparticles, greatly reduce the amount of expensive elastomers, and the prepared polyoxymethylene Formaldehyde composite material has excellent rigidity and toughness, and the cost is greatly reduced, but it has the disadvantages of complicated preparation process, inconvenient industrial mass production, and difficult to control the product quality stably
[0009] (3) Alloying and toughening polyoxymethylene, the toughening effect is generally not as good as that of elastomer toughening, and it often leads to a substantial deterioration of certain properties of polyoxymethylene

Method used

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  • A kind of toughened polyoxymethylene composition and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take each component raw material by the following parts by weight:

[0043] 100 parts of polyoxymethylene,

[0044] 0.1 part of light magnesium oxide,

[0045] 2 parts titanium dioxide,

[0046] 0.6 parts of N, N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine,

[0047] 0.6 parts of tris(2.4-di-tert-butylphenyl) phosphite,

[0048] 0.5 parts of melamine,

[0049] 3 parts calcium stearate,

[0050] Wherein polyoxymethylene and light magnesium oxide were dried at 80° C. for 3 hours and then used for subsequent use;

[0051] Add the raw materials of the above components into a high-speed mixer and mix them uniformly for 10 minutes; melt and blend the uniformly mixed raw materials with a vented co-rotating twin-screw extruder, extrude and granulate, and obtain the toughened polyoxymethylene compound things. The mechanical properties of the materials are listed in Table 1. Wherein the screw speed is 280 rpm, and the barrel temperature (°C) i...

Embodiment 2

[0055] Take each component raw material by the following parts by weight:

[0056] 100 parts of polyoxymethylene,

[0057] 0.2 parts of light magnesium oxide,

[0058] 1 part of talcum powder (1250 mesh),

[0059] 0.4 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester,

[0060] 0.4 parts of tris(2.4-di-tert-butylphenyl) phosphite,

[0061] 0.6 parts of melamine,

[0062] 5 parts of calcium stearate,

[0063] Wherein polyoxymethylene and light magnesium oxide were dried at 80° C. for 3 hours and then used for subsequent use;

[0064] Add the raw materials of the above components into a high-speed mixer and mix them uniformly for 5 minutes; melt and blend the uniformly mixed raw materials with a vented co-rotating twin-screw extruder, extrude and granulate, and obtain the toughened polyoxymethylene composite things. The mechanical properties of the materials are listed in Table 1. Wherein the screw speed is 210 rpm, and the barrel t...

Embodiment 3

[0068]Take each component raw material by the following parts by weight:

[0069] 100 parts of polyoxymethylene,

[0070] 0.3 parts of light magnesium oxide,

[0071] 0.5 parts of talcum powder (1250 mesh),

[0072] 0.2 parts of β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate,

[0073] 0.2 parts of tris(2.4-di-tert-butylphenyl) phosphite,

[0074] 0.8 parts of melamine,

[0075] Magnesium stearate 4 parts,

[0076] Wherein polyoxymethylene and light magnesium oxide were dried at 80° C. for 3 hours and then used for subsequent use;

[0077] Add the raw materials of the above components into a high-speed mixer and mix them uniformly for 8 minutes; melt and blend the uniformly mixed raw materials with a vented co-rotating twin-screw extruder, extrude and granulate, and obtain the toughened polyoxymethylene compound things. The mechanical properties of the materials are listed in Table 1. Wherein the screw speed is 250 rpm, and the barrel temperature (°C) is:

...

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Abstract

The invention belongs to the technical field of polymer materials, and discloses a toughened polyformaldehyde composition and a preparation method thereof. The toughened polyformaldehyde composition is prepared from the following components, by weight, 100 parts of polyformaldehyde, 0.1-0.3 part of a first nucleating agent, 0.5-2 parts of a second nucleating agent, 0.2-0.6 part of a main antioxidant, 0.2-0.6 part of an auxiliary antioxidant, 0.5-0.8 part of a formaldehyde absorber, and 3-5 parts of a lubricant. The toughened polyformaldehyde composition preparation method comprises the following steps: adding 100 parts by weight of polyformaldehyde, 0.1-0.3 part by weight of a first nucleating agent, 0.5-2 parts by weight of a second nucleating agent, 0.2-0.6 part by weight of a main antioxidant, 0.2-0.6 part by weight of an auxiliary antioxidant, 0.5-0.8 part by weight of a formaldehyde absorber, and 3-5 parts by weight of a lubricant to a high speed mixer to uniformly mix for 5-10 min, carrying out melt blending on the uniformly-mixed mixture through a vented co-rotating twin screw extruder, and carrying out extrusion granulation, wherein a screw rotation speed is controlled to 210-280 rotation / min. The toughened polyformaldehyde composition has characteristics of improved toughness, good tension strength, good rigidity and low cost.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a toughened polyoxymethylene composition and a preparation method thereof. Background technique [0002] Polyoxymethylene, known as "plug steel", is an engineering plastic with excellent comprehensive properties. It has high fatigue resistance, good creep resistance, good dimensional stability and rigidity. However, due to its special structure, high crystallinity, and large spherulite size, it is sensitive to notches and has low notched impact strength, which limits its application in some fields. At present, the methods for toughening and modifying polyoxymethylene mainly include: (1) elastomer toughening, common elastomers include thermoplastic polyurethane, nitrile rubber, EPDM rubber, ionomer, ethylene octene copolymer, ethylene (2) Composite toughening of elastomers and inorganic nanoparticles; (3) Alloying and toughening. Commonly used alloy components include pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/02C08K13/02C08K3/22C08K3/34B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/9259B29C2948/92885
Inventor 王贻孙
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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