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Antioxidant composition, modified polyformaldehyde resin composition and modified polyformaldehyde resin and preparation method thereof

A technology of polyoxymethylene resin and composition, which is applied in the field of modified polyoxymethylene resin, and can solve the problems affecting the production cost of POM and the high price of antioxidants, etc.

Active Publication Date: 2016-08-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve a better anti-thermal oxygen effect, a large amount of antioxidant is usually required, and the price of this type of antioxidant is usually relatively expensive, so it has become one of the main factors affecting the production cost of POM

Method used

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  • Antioxidant composition, modified polyformaldehyde resin composition and modified polyformaldehyde resin and preparation method thereof

Examples

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preparation example Construction

[0023] The preparation method of the modified polyoxymethylene resin provided by the present invention comprises melting, extruding and granulating the above-mentioned modified polyoxymethylene resin composition at 180-225° C., and then drying.

[0024] According to the preparation method of the modified polyoxymethylene resin provided by the present invention, the method also preferably includes mixing the components in the modified resin composition uniformly before melt extrusion granulation, which is more conducive to the Improvement of thermal stability of polyoxymethylene resin. The step of melt extrusion granulation can usually be carried out in an existing single-screw extruder or twin-screw extruder. In addition, the drying conditions generally include that the drying temperature may be 50-100° C., and the drying time may be 1-10 hours.

[0025] The present invention also provides the modified polyoxymethylene resin prepared by the above method.

Embodiment 1

[0028] This example is used to illustrate the antioxidant composition, the modified polyoxymethylene resin composition, the modified polyoxymethylene resin and the preparation method thereof provided by the present invention.

[0029]100 parts by weight of polyoxymethylene resin (purchased from Shenhua Ningxia Coal Group Coal Chemical Branch, brand name is MC90G, the same below), 2.1 parts by weight of diphenylmethane-4,4'-diisocyanate (MDI) (Alfa Aesar company, The same below), 1 part by weight of polyamide PA6 / 12 (purchased from EMS Swiss Chemical Co., Ltd., the brand is Grilamid, the same below), 0.1 part by weight of antioxidant 2-tert-butylhydroquinone (antioxidant TBHQ) , 0.4 parts by weight of tris (2,4-di-tert-butylphenyl) phosphite (antioxidant 168), 0.4 parts by weight of melamine, and 0.4 parts by weight of magnesium hydroxide are uniformly mixed and then used in a vented twin-screw extruder Melting extrusion granulation, the extrusion temperature is 180°C-225°C, th...

Embodiment 2

[0031] This example is used to illustrate the antioxidant composition, the modified polyoxymethylene resin composition, the modified polyoxymethylene resin and the preparation method thereof provided by the present invention.

[0032] 100 parts by weight of polyoxymethylene resin, 4 parts by weight of 2,4-toluene diisocyanate (TDI), (purchased from Alfa Aesar company, the same below), 0.5 parts by weight of polyamide PA6 / 12, 0.05 parts by weight of antioxidant Agent 2-tert-butylhydroquinone (antioxidant TBHQ), 0.25 parts by weight 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzene Methyl)benzene (antioxidant 1330), 0.3 parts by weight of melamine, and 0.3 parts by weight of calcium stearate are uniformly mixed and then melted and extruded into pellets by a vented twin-screw extruder at an extrusion temperature of 180°C-225°C , the screw speed was 100 rpm, and after granulation, it was dried at 80° C. for 2 hours to obtain modified polyoxymethylene resin G2.

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Abstract

The invention provides an antioxidant composition, a modified polyformaldehyde resin composition and modified polyformaldehyde resin and a preparation method thereof. The antioxidant composition is prepared from, by weight, 2.1-7 parts of an isocyanate compound, 0.3-2.5 parts of a formaldehyde absorbent and 0-1 part of an optional free radical capturing agent and is preferably prepared from, by weight, 2.1-5 parts of the isocyanate compound, 0.5-2 parts of the formaldehyde absorbent and 0-0.3 part of the optional free radical capturing agent. When polyformaldehyde resin is modified by the antioxidant composition, the heat stability of the polyformaldehyde resin can be very significantly improved.

Description

technical field [0001] The present invention relates to an antioxidant composition, a modified polyoxymethylene resin composition containing the antioxidant composition, a preparation method of modified polyoxymethylene resin and a modified polyoxymethylene resin prepared by the method. Formaldehyde resin. Background technique [0002] Polyoxymethylene (POM) has poor thermal stability due to its special molecular structure, so the thermal stabilization of POM is the most important and basic key technology in its synthesis, processing and application. POM is prone to thermal action and oxygen action during the melting process. Once its molecules generate free radicals, they will undergo chain scission, and then a continuous formaldehyde removal reaction will occur. The formaldehyde and the trace amount of formic acid generated by the oxidation of formaldehyde will promote the thermal decomposition process and greatly accelerate the formaldehyde removal reaction until the mac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L77/02C08L77/06C08K13/02C08K5/29C08K5/3492
Inventor 孙小杰梁文斌马伊张寅灵赖世燿
Owner CHNA ENERGY INVESTMENT CORP LTD
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