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Continuous production method for polyoxymethylene resin

A technology of polyoxymethylene resin and production method, which is applied in the field of polyoxymethylene resin production technology, can solve the problems of high overall operating cost, long production cycle, and large investment in equipment, and achieve the effects of short reaction time, reduced dosage, and low operating cost

Inactive Publication Date: 2008-02-06
ZHEJIANG SANPO POLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its equipment investment is large, the production cycle is long, and the overall operating cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The monomer paraformaldehyde in the liquid state and the polymerization solvent dioxane are pre-mixed according to the volume ratio of 100:1; Co-rotating and counter-rotating twin-screw extruders, the working temperature of the extruder is controlled at 200°C, the rotational speed is controlled at 200r / min, and the polymerization reaction is carried out in the presence of a cationic catalyst, and the polymerization time is 0.5min. During the entire production process, there is no leakage due to the recycling of unconverted monomers and polymerization solvents. Copolyoxymethylene is obtained after the polymerization reaction is completed, and the copolyoxymethylene is packaged to obtain a finished product after proper post-treatment. Acetal copolymer products are white.

Embodiment 2

[0025] The monomer paraformaldehyde in the liquid state and the polymerization solvent propylene oxide are pre-mixed according to the volume ratio of 100:50; And counter-rotating conveying twin-screw extruder, the working temperature of the extruder is controlled at 100°C, the speed is controlled at 50r / min, and the polymerization reaction is carried out in the presence of a cationic catalyst, and the polymerization time is 10min. During the entire production process, there is no leakage due to the recycling of unconverted monomers and polymerization solvents. Homopolyoxymethylene is obtained after the polymerization reaction is completed, and the homopolyoxymethylene is packaged to obtain a finished product after proper post-processing. Homopolyoxymethylene products are white.

Embodiment 3

[0027] The monomer paraformaldehyde in the liquid state and the polymerization solvent acetone are pre-mixed according to the volume ratio of 50:100; then the mixed solution is pumped into a reverse conveying four-screw extruder with a length-to-diameter ratio of 200 at 20 ° C. Out of the extruder, the working temperature of the extruder is controlled at 100° C., the rotational speed is controlled at 30 r / min, and the polymerization reaction is carried out in the presence of a cationic catalyst, and the polymerization time is 100 minutes. During the entire production process, there is no leakage due to the recycling of unconverted monomers and polymerization solvents. Homopolyoxymethylene is obtained after the polymerization reaction is completed, and the homopolyoxymethylene is packaged to obtain a finished product after proper post-processing. Homopolyoxymethylene products are white.

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PUM

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Abstract

The invention discloses a serial production method of acetaldehyde resin, belonging to the production technique of acetaldehyde resin technical field, firstly monomer metaformaldehyde of liquid state and polymer solvent are premixed according to 100:1 to 1:100 volume ratio; subsequently the mixed solution is transported to a consecutive reactor by a pump at 0 to 150 DEG C, and processes the polymerization at 30 to 200 DEG C in the condition of positive ion catalyst existing, the polymerization time is 0.5 to 100 min; after the polymerization being over, the obtained product can be processed with continual process. The serial production method of acetaldehyde resin of the invention produces polyformat dehyde of good quality, the whole production process can be continuously carried out, the assembly line type is used for work, the yield is large, and the unconverted monomer and the polymer solvent in the production process are not leaked, and can be repeatedly used.

Description

technical field [0001] The invention discloses a continuous production method of polyoxymethylene resin, which belongs to the technical field of polyoxymethylene resin production technology. Background technique [0002] Polyoxymethylene (POM), also known as polyoxymethylene (POM), is a thermoplastic resin with excellent comprehensive properties. Polyoxymethylene resin has high elastic modulus, hardness, rigidity and mechanical properties in a large temperature range, and can be used for a long time below 104 ° C, with an embrittlement temperature of -40 ° C and low water absorption. At the same time, its outstanding feature is low friction coefficient, the same dynamic friction coefficient and static friction coefficient, excellent self-lubrication and wear resistance. The mechanical properties of POM resin are similar to those of metal, and its specific gravity is small. It is widely used to replace copper, zinc, aluminum and other metal materials and other plastics. It i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G6/00
Inventor 周赞斌喻家顺傅大放程晔华裘红
Owner ZHEJIANG SANPO POLYMER
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