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Thermal stability metaformaldehyde and its preparation method

A technology of thermal stability and polyoxymethylene, which is applied in the field of thermal stability polyoxymethylene and its preparation, can solve problems such as failure to meet thermal stability requirements, surface deterioration of molded products, and increase in formaldehyde content, and achieve good thermal stabilization effects , high thermal stability, low volatility

Inactive Publication Date: 2005-01-26
YUNNAN YUNTIANHUA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1196073A discloses that the existing polyoxymethylene resin cannot meet the thermal stability requirements, and deposits are produced on the mold, which deteriorates the surface of the molded product. The amount of formaldehyde, due to the further generation of formaldehyde into formic acid, thereby promoting the decomposition of the polyoxymethylene resin main chain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 10Kg of polyoxymethylene resin and tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester 50g, 10g of melamine, 30g of magnesium oxide, and 10g of PA6 into a high-speed mixer and mix them. Vented twin-screw extruder melts and kneads, extrudes and granulates. Screw speed, 40 rpm; barrel temperature, 140-190°C.

Embodiment 2

[0035] Polyoxymethylene resin 10Kg and bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl) triethylene glycol propionate 40g, dicyandiamide 20g, sodium oxide 10g, ternary copolymerization Add 20 g of the amide into a high-speed mixer for mixing, melt and knead with a vented twin-screw extruder, and extrude to granulate. Screw speed, 90 rpm; barrel temperature, 150-200°C.

Embodiment 3

[0037] Add 10Kg of polyoxymethylene resin, 30g of bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] 1,6-hexanediol ester, 30g of melamine, 7g of calcium silicate, and 60g of PA12 Mix in a high-speed mixer, melt and knead with a vented twin-screw extruder, and extrude to granulate. Screw speed, 150 rpm; barrel temperature, 170-230°C.

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PUM

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Abstract

The invention discloses a thermal stability metaformaldehyde and its preparation method which comprises, charging polyoxymethylene resin, anti-oxidizing agent, methylene oxide absorbing agent, methanoic acid absorbing agent and auxiliary methylene oxide absorbing agent into high speed mixing machine, melting and co-blending by employing exhaust type double screw stem extrusion machine, finally squeezing and granulating.

Description

1. Technical field [0001] The invention relates to a thermally stable polyoxymethylene and a preparation method thereof, belonging to the field of polymer processing. 2. Background technology [0002] Polyoxymethylene (POM) is [-CH 2 -O-] Main chain, unbranched, high melting point, high density, high crystallinity thermoplastic engineering plastics. Compared with other thermoplastics, it has high strength and rigidity, hard surface, good dimensional stability, excellent creep resistance, fatigue resistance, inherent lubricity, wear resistance and chemical resistance, etc., is The kind closest to metal in engineering plastics can be used to replace copper, aluminum, zinc and other non-ferrous metals and alloy products. Its output ranks third among the top five engineering plastics, second only to polyamide (PA) and polycarbonate (PC). POM raw materials come from a wide range of sources, and can be processed by injection molding, blow molding, extrusion molding and rotary c...

Claims

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Application Information

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IPC IPC(8): C08K5/3492C08L59/00
Inventor 叶林夏和生胡友亮刘廷华李惠林简芳侯世荣
Owner YUNNAN YUNTIANHUA
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