Preparation method of polyacetal composition

A technology for polyacetal and composition, applied in the field of preparation of polyacetal composition, can solve the problems of accelerated copolyformaldehyde degradation, large amount of catalysis, inability to completely eliminate initiators, etc. The conversion rate is high, and the effect of avoiding the generation of formaldehyde

Pending Publication Date: 2022-02-15
CHINA CHEM TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet process requires water, centrifugation, and drying; the dry process simplifies the operation, but due to the large amount of catalyst used, the residual initiator in the polymer cannot be completely eliminated, and the residual initiator that has not been completely deactivated will accelerate the copolymerization of formaldehyde Degradation

Method used

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  • Preparation method of polyacetal composition
  • Preparation method of polyacetal composition
  • Preparation method of polyacetal composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of a polyacetal composition, comprising the following steps:

[0045] S1: Add monomers, organic boron-based initiators, and molecular weight regulators into a reaction vessel for mixing to obtain a mixed solution.

[0046] S2: In an inert gas environment, heat the mixed solution to 80°C to carry out polymerization reaction, and complete the polymerization reaction after 10 minutes of reaction to obtain crude polyacetal powder.

[0047] S3: adding water and a stabilizing additive to the crude polyacetal powder to obtain a mixed material.

[0048] S4: Stir and mix the mixed materials uniformly at a vacuum degree of 5 mmHg and 120° C., and continue to stay in the reaction vessel for 10 minutes. After the operation is completed, the materials are discharged to obtain a crude polyacetal powder composition.

[0049] S5: put the crude polyacetal powder composition into an extruder, and obtain the polyacetal composition after melt extrusion.

[0050] Wher...

Embodiment 2

[0058] Based on the preparation method of the polyacetal composition described in Example 1, the reaction temperature in step S2 was adjusted to 90°C.

Embodiment 3

[0060] Based on the preparation method of the polyacetal composition described in Example 1, the comonomer in step S1 is adjusted to propylene glycol formal.

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Abstract

The invention provides a preparation method of a polyacetal composition, which comprises the following steps: S1, adding a monomer, an organic boron initiator and a molecular weight regulator into a reaction container to obtain a mixed solution; S2, in an inert gas environment, heating the mixed solution to 70-90 DEG C, carrying out a polymerization reaction, and obtaining crude polyacetal powder after the reaction is completed; S3, adding an auxiliary agent into the crude polyacetal powder to obtain a mixed material; S4, stirring and uniformly mixing the mixed material, and continuing to stay in the reaction container for 8-15 minutes to obtain a crude polyacetal powder composition; and S5, putting the crude polyacetal powder composition into an extruder, and carrying out melt extrusion to obtain the polyacetal composition. The polyacetal composition prepared by the method provided by the invention not only has higher monomer conversion rate, but also obviously reduces the formaldehyde emission.

Description

technical field [0001] The invention relates to the technical field of preparation of new materials, in particular to a preparation method of a polyacetal composition. Background technique [0002] The production and preparation of polyacetal (POM) generally adopts the bulk or suspension polymerization method, which is formed by ring-opening polymerization with trioxane as the main monomer and cyclic ether and / or cyclic formal as the comonomer. The commonly used initiators for polyacetals are Lewis acids, such as halides of boron, titanium, arsenic, etc., among which the most commonly used initiators are boron trifluoride, or the coordination of boron trifluoride and organic compounds, such as ethers Compounds are most widely used in industry. However, the amount of the initiator used is relatively large (for example, 30ppm or more relative to the total amount), and the initiator remains in the polymer after the polymerization is completed, which promotes the degradation of...

Claims

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Application Information

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IPC IPC(8): C08G2/22C08G2/06C08G2/28
CPCC08G2/22C08G2/06C08G2/28
Inventor张文龙李克景张小明贺腾杨磊王东继袁助贺鑫平骆彩萍
OwnerCHINA CHEM TECH RES INST