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Novel process for synthesizing polyformaldehyde

A technology of polyoxymethylene and new technology, which is applied in the field of new polyoxymethylene synthesis technology, can solve problems such as difficult process control, environmental pollution, complex polyoxymethylene production process, etc., and achieve energy saving, process simplification, and high polymerization yield.

Inactive Publication Date: 2012-12-05
房世平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With a lower cost than many other engineering plastics, it is replacing some markets traditionally occupied by metals. Due to the complex production process of traditional polyoxymethylene, the process is not easy to master, and the environmental pollution is serious, so there is an urgent need for a newer type of polyoxymethylene synthesis. craft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] a. Make 1.84%wt ethylene oxide and 4.06×10 -1 The paraformaldehyde of methylal is mixed gas 3.11×10 with the flow rate of 4.26 parts / h and boron trifluoride and nitrogen volume ratio of 1:10 -5 Enter a 2.36mm diameter tube and spray continuously from the nozzle. The catalyst filling amount in the reaction tube is 0.64cm from the spiral surface; when the reactant passes through the reactor, the reaction temperature is controlled to be 105°C, the reaction end temperature is 92°C, and the residence time Approximately 10 minutes, the resulting polymer particles are 1 mm in size, and then quenched and stabilized in a quencher containing water and triethylamine;

[0013] b. Mix Polyethylene Glycol with the rapidly cooled and stabilized substance in step a at a weight ratio of 1:0.25. When the temperature is kept at 30°C, stir until it is completely dissolved to obtain a solution, and then mix the solution with transparent urea-formaldehyde resin Liquid is mixed by volume rat...

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Abstract

The invention relates to a generation process for a chemical polymer, belongs to the field of polymer materials and particularly relates to a novel process for synthesizing paraformaldehyde. The novel process is characterized in that methanol and recovered dilute formaldehyde are used to synthesize methylal with high purity; the methylal is used for producing trioxymethylene; and the trioxymethylene is used for producing the paraformaldehyde disclosed by the invention. The novel process comprises the following steps: enabling the trioxymethylene containing ethylene oxide and methylal to be continuously sprayed out of a spray head; controlling the reaction temperature to be 96-105DEG C, the detention time to be about 10 minutes and the generated polymer particle to be 1 mm; carrying out quenching and stabilized treatment and mixing in a quencher containing water and triethylamine; stirring polyethylene glycol to be completely dissolved and obtain the solution; and reacting to obtain the paraformaldehyde disclosed by the invention, wherein the conversion rate of the paraformaldehyde disclosed by the invention is 58.7 percent. The novel process has the benefits that materials are always positioned in a molten state without phase conversion; polymerization heat can be utilized, so that energy sources are saved and the process is simplified; and in addition, no solvent is used in the polymerization process and the polymerixation yield is high.

Description

technical field [0001] The invention relates to a process for producing chemical polymers, which belongs to the field of polymer materials, in particular to a new process for synthesizing polyoxymethylene. Background technique [0002] Polyoxymethylene (POM), also known as polyacetal, known as "super steel" or "Sai steel", also known as polyoxymethylene, is a kind of engineering plastic with excellent performance. Its surface is smooth and shiny. The dense material, light yellow or white, can be used for a long time in the temperature range of -40 ~ 100 ℃; its wear resistance and lubricity are also superior to most engineering plastics, and it has good oil resistance and peroxide resistance. . [0003] Polyoxymethylene is a thermoplastic crystalline polymer, not resistant to acid, strong alkali and ultraviolet radiation of sunlight; its tensile strength reaches 70MPa, low water absorption, stable size, glossy, and is the toughest among thermoplastic resins; it has high heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G2/10C08L61/24C08L71/08C08L59/02
Inventor 房世平
Owner 房世平
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