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Preparation method of thermally-stable polyformaldehyde copolymer

A polyoxymethylene copolymer, thermal stability technology, applied in the field of preparation of polyoxymethylene copolymer, can solve the problems of single product types of polyoxymethylene, decline in thermal stability performance, and the performance of processed products cannot meet the needs of use, etc.

Active Publication Date: 2012-08-29
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polyoxymethylene obtained in this way is a copolymerized polyoxymethylene with a linear structure. Although its thermal stability and mechanical properties are improved compared with homopolyoxymethylene, when the content of the comonomer increases to a certain value, the thermal stability will tend to be Stable or even a downward trend
In addition, as a mass-produced engineering plastic, polyoxymethylene has a single product category and few grades, and the performance of processed products cannot meet the needs of use.

Method used

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  • Preparation method of thermally-stable polyformaldehyde copolymer
  • Preparation method of thermally-stable polyformaldehyde copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 48.12g of freshly distilled TOX into a dry reaction flask filled with nitrogen, place in an oil bath at 70°C and stir for 0.5h, mix well and add 34μL of initiator BF 3 ·OEt 2 , continue to stir, after reacting for 1 h, add 39 μL of triethylamine to terminate, wash, filter and vacuum dry to obtain a white powdery polymer.

Embodiment 2

[0029] Add freshly distilled 63.50g TOX and 1.39g CHO into a dry nitrogen-filled reaction flask, place in an oil bath at 70°C and stir for 0.5h, mix well and add 100μL of initiator BF 3 ·OEt 2 , continue to stir, after reacting for 1 hour, add 114 μ L of triethylamine to stop, wash and filter and dry to obtain 53.82 g of crude product, add 215 mL of DMF solution containing 2.03 g of triethanolamine to it for post-treatment at 160 ° C, cool to room temperature, and the resulting product was vacuum-dried to obtain 19.63 g of a white powdery polymer.

Embodiment 3-6

[0031] The polymerization process is the same as in Example 2, except that the ratio of comonomer TOX and CHO is changed. The results are shown in Table 1.

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Abstract

The invention discloses a preparation method of a thermally-stable polyformaldehyde copolymer. The preparation method is characterized by comprising the following steps of: catalyzing copolymerization of trioxymethylene (TOX) and cyclohexene oxide (CHO) under an anhydrous oxygen-free condition in the presence of an initiator BF3 complex compound or HClO4, wherein the molar ratio of the CHO to TOX is (1.5:98.5)-(20:80), preferably (2:98)-(15:85), and more preferably (3:97)-(10:90); and after polymerization, performing post-treatment on an alkaline liquor, and removing the initiator, a thermally-instable homopolymer and an instable part of a polymer chain end to obtain the thermally-stable polyformaldehyde copolymer.

Description

technical field [0001] The invention relates to a preparation method of a thermally stable polyoxymethylene copolymer. Background technique [0002] Polyoxymethylene, an engineering plastic with excellent performance, has hemiacetal end groups in its macromolecular chain, which makes it prone to depolymerization at the end of the molecular chain and breakage in the middle of the molecular chain to degrade under the action of light and heat, which seriously affects its use. performance. Therefore, improving the thermal stability of polyoxymethylene has become the focus of research in the field of polyoxymethylene modification. The stability of polyoxymethylene can be improved to a certain extent by adding stabilizers or capping methods, but the stabilization effect is not obvious due to poor blending compatibility or capping cannot reach 100%. In order to greatly improve the thermal stability of polyoxymethylene, it is necessary to start with its structure, that is, to opti...

Claims

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Application Information

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IPC IPC(8): C08G2/10C08G2/06
Inventor 李化毅贺丽娟方勇张新志张辽云张英伟胡友良杨雪岗
Owner INST OF CHEM CHINESE ACAD OF SCI
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