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Drying time control-based polyvinyl alcohol synthesis process

A drying time, polyvinyl alcohol technology, applied in the field of polyvinyl alcohol synthesis technology, can solve problems such as poisoning, and achieve the effects of fast synthesis speed, high synthesis efficiency and excellent quality

Inactive Publication Date: 2014-04-16
刘丹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the aqueous solution is stored, sometimes it will become toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present invention relates to a polyvinyl alcohol synthesis process based on controlled drying time, including the following steps:

[0032] (a) Measure a certain amount of ethanol and polyethylene for use;

[0033] (b) Put ethanol in the reaction vessel and adjust the pH value;

[0034] (c) Stir and slowly add polyethylene;

[0035] (d) Heat the reaction vessel in a water bath;

[0036] (e) After the reaction is terminated, the product is precipitated;

[0037] (f) Filter the precipitated product for drying, and control the drying time to 70 minutes to obtain the target product.

[0038] In the process of synthesizing polyvinyl alcohol, the drying time has a great influence on the performance of the synthesized product. In order to obtain the best drying time, the present invention conducts an experiment on the effect of the drying time on the performance of the synthesized product. The experiment shows that: When the drying time is longer, the moisture contained in the produc...

Embodiment 2

[0041] The difference between this embodiment and Embodiment 1 is only that the drying time is 65 minutes, and other parts of this embodiment are the same as Embodiment 1, and will not be repeated.

Embodiment 3

[0043] The difference between this embodiment and Embodiment 1 is only that the drying time is 75 minutes, and other parts of this embodiment are the same as Embodiment 1, and will not be repeated.

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PUM

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Abstract

The invention discloses a drying time control-based polyvinyl alcohol synthesis process which comprises the following steps of (a) weighing certain amounts of ethanol and polyethylene for later use; (b) charging the ethanol in a reaction container, and adjusting the pH value; (c) slowly adding the polyethylene while stirring; (d) placing the reaction container in a water bath for heating; (e) precipitating a product after reaction; (f) filtering and drying the precipitated product to obtain a target product, wherein the drying time is controlled to be 60 to 80 minutes. According to the process, polyvinyl alcohol can be successfully synthesized; the process is high in synthesis efficiency and synthesis speed; the drying time in a reaction process is controlled, so that the synthesized target product is high in quality.

Description

Technical field [0001] The invention relates to a polyvinyl alcohol synthesis process based on controlling the drying time. Background technique [0002] The physical properties of polyvinyl alcohol are affected by chemical structure, degree of alcoholysis, and degree of polymerization. There are two chemical structures in polyvinyl alcohol molecules, namely 1, 3 and 1, 2 ethylene glycol structures, but the main structure is 1, 3 ethylene glycol structure, that is, the "head·tail" structure. The degree of polymerization of polyvinyl alcohol is divided into ultra-high degree of polymerization (molecular weight of 250,000 to 300,000), high degree of polymerization (molecular weight of 170 to 220,000), medium degree of polymerization (molecular weight of 120,000 to 150,000) and low degree of polymerization (25,000 to 35,000) ]. The degree of alcoholysis is generally 78%, 88%, and 98%. The degree of alcoholysis of partial alcoholysis is usually 87% to 89%, and the degree of alcoho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F18/08C08F8/00C08F16/06
Inventor 刘丹
Owner 刘丹