Preparation method of thermally-stabilized copolyoxymethylene

A formaldehyde copolymer and heat-stabilized technology, which is applied in the preparation of heat-stable formaldehyde copolymer and end-group stabilization treatment in the post-treatment of formaldehyde copolymer powder, can solve the problem of low production efficiency, difficulty in complete hydrolysis of unstable end-group, and alkaline medium Problems such as large amount

Inactive Publication Date: 2014-04-30
杨晓莉
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the polymer suspended in alkaline water is insoluble, infusible, and it is difficult to completely hydrolyze the unstable end group. In addition, the amount of alkaline medium used in the treatment process is large, the recovery process is complicated, and the production efficiency is low. It is not suitable for large-scale industrial production.

Method used

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  • Preparation method of thermally-stabilized copolyoxymethylene
  • Preparation method of thermally-stabilized copolyoxymethylene
  • Preparation method of thermally-stabilized copolyoxymethylene

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Without adding any additives, the acetal copolymer powder is directly melted and extruded by a vented twin-screw extruder, the processing temperature is 180°C-220°C, the pressure in the vacuum zone is 0.01-0.2bar, and the screw speed is 120 rpm / min, dried at 80°C for 4 hours after granulation.

Embodiment 2

[0039] 10Kg of polyoxymethylene powder and 30 g of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester were uniformly mixed and extruded using a vented twin-screw extruder. The treatment temperature is 180°C-220°C, the pressure in the vacuum zone is 0.01-0.2 bar, the screw speed is 120 rpm, and the pellets are dried at 80°C for 4 hours.

Embodiment 3

[0041] Mix 10Kg of polyoxymethylene powder, tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester 30g, magnesium hydroxide 5g, and deionized water 10g evenly and then use exhaust type The twin-screw extruder is melted and extruded, the processing temperature is 180°C-220°C, the pressure in the vacuum zone is 0.01-0.2bar, the screw speed is 120 rpm, and it is dried at 80°C for 4 hours after granulation.

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Abstract

The invention discloses a preparation method of thermally-stabilized copolyoxymethylene. The preparation method is characterized in that copolyoxymethylene is heated to temperature of a polymer melting point to 240 DEG C by an exhaust double screw extruder and then is subjected to melt extrusion aftertreatment; and in the treatment, an alkaline substance is used and promotes fast decomposition of unstable end groups so that the end groups of copolyoxymethylene are stabilized and the thermally-stabilized copolyoxymethylene having good thermostability and low formaldehyde release amount is obtained.

Description

technical field [0001] The invention relates to a method for preparing thermally stable polyoxymethylene copolymer, in particular to a method for stabilizing terminal groups in the post-treatment of polyoxymethylene copolymer powder, and belongs to the field of polymer preparation and processing. Background technique [0002] Polyoxymethylene copolymer is a thermoplastic engineering plastic with excellent comprehensive properties, which has been widely used in automobiles, electrical and electronic instruments, office equipment, construction machinery and other fields. Especially as a variety of power transmission parts (gears, crankshafts, bearings, etc.), it has an irreplaceable important position. [0003] In the industry, trioxane is usually used as a monomer, and the comonomer is used in the initiator BF 3 ·OEt 2 Under the action of cationic ring-opening polymerization to obtain polyoxymethylene resin. The comonomer is a cyclic acetal or cyclic ether compound contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/02C08K5/134C08K5/098C08K3/22C08K5/17C08K5/05B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/92514B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 杨晓莉
Owner 杨晓莉
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