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A kind of preparation method of special polyvinyl alcohol for optical materials

A technology of polyvinyl alcohol and optical materials, which is applied in the field of preparation of polyvinyl alcohol for optical materials, and can solve the problems of polyvinyl alcohol’s comprehensive performance advantages and increased production costs

Active Publication Date: 2020-10-27
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, although the impurity content has decreased, the production cost has increased significantly, and the overall performance advantages of the obtained polyvinyl alcohol are not prominent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This implementation discloses a preparation method of special polyvinyl alcohol for optical materials, comprising the following steps:

[0038] (1) Using vinyl monomers to prepare crude polyvinyl alcohol through polymerization, alcoholysis, crushing and pressing, the crude polyvinyl alcohol is crushed to 10-100 mesh; the degree of polymerization of the crude polyvinyl alcohol is measured to be 1550, The degree of alcoholysis is 97.5mol%;

[0039] (2) Add 4M to the reactor I with stirring and heating system 3 Methanol, start the stirring system, and add the crude product polyvinyl alcohol obtained in step (1) while stirring, and the addition amount of the crude product polyvinyl alcohol is 1 ton;

[0040] (3) Raise the temperature of the material in step (2) to 30-50°C, and then add an alcohol solution with a concentration of 20g / L NaOH for reaction. The alcohol solution can be methanol solution, ethanol solution or a mixture thereof, preferably methanol solution; The ...

Embodiment 2

[0045] The difference between this embodiment and embodiment 1 is:

[0046] (1) The obtained crude polyvinyl alcohol has a polymerization degree of 2520 and an alcoholysis degree of 98.5mol%;

[0047] (2) Join 3M 3 tons of methanol;

[0048] (3) Add a methanol solution with a concentration of 30g / L NaOH, and the amount of NaOH added is 0.002 times the molar amount of the crude polyvinyl alcohol;

[0049] (5) After washing for 40 minutes, repeat the washing 3 times; the last washing is with pure water at 10°C;

[0050] (6) Through testing, the degree of polymerization of polyvinyl alcohol sent into the silo is 2565, and the degree of alcoholysis is 99.8mol%.

Embodiment 3

[0052] The difference between this embodiment and embodiment 1 is:

[0053] (1) The obtained crude polyvinyl alcohol has a polymerization degree of 1760 and an alcoholysis degree of 98.2mol%;

[0054] (2) Join 5M 3 Methanol;

[0055] (3) Add a methanol solution with a concentration of 10g / L NaOH, and the amount of NaOH added is 0.05 times the molar amount of the crude polyvinyl alcohol;

[0056] (5) After washing for 80 minutes, repeat the washing twice; the last washing is with pure water at 10°C;

[0057] (6) Through testing, the degree of polymerization of polyvinyl alcohol sent into the silo is 1798, and the degree of alcoholysis is 99.6mol%.

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Abstract

The invention relates to high-molecular compound and specifically discloses a preparation method of dedicated polyvinyl alcohol of an optical material. The preparation method comprises the following steps: (1) preparing crude polyvinyl alcohol; (2) adding methyl alcohol into a reaction kettle I, stirring and adding the crude polyvinyl alcohol obtained in the step (1) while stirring; (3) warming to 30 to 50 DEG C and then adding a NaOH alcoholic solution; (4) adding acetic acid after reaction finishes, adjusting a pH value to 5 to 7, then switching on a discharging bottom valve to discharge materials and separating the materials to obtain complete alcoholysis type polyvinyl alcohol; (5) adding purified water into a reaction kettle II, introducing nitrogen, starting stirring, then adding the polyvinyl alcohol and washing the polyvinyl alcohol; (6) switching on a discharging bottom valve of the reaction kettle II to discharge the materials after washing and then dewatering the obtained polyvinyl alcohol. The polyvinyl alcohol obtained by the preparation method disclosed by the invention has concentrated polymerization degree and alcoholysis degree distribution and high cleanness and can be applied to the field of optical materials.

Description

technical field [0001] The invention relates to a polymer compound, in particular to a preparation method of polyvinyl alcohol special for optical materials. Background technique [0002] Polyvinyl alcohol (Polyvinyl Alcohol, referred to as PVA) is one of the few artificially synthesized water-soluble polymers with good fiber-forming properties, cohesive properties, film-forming properties, transparency, emulsification stability, and dispersion stability. Resistance, oil resistance, acid and alkali resistance, chemical reactivity, biodegradability, etc., are widely used in textile, paper, construction, chemical, printing, packaging, medicine, daily chemical, agriculture, ceramics, steel, electronics, electrolysis, Electroplating and other industries. With the continuous development of product technology, its application field is still expanding, and it has a good development prospect. [0003] Polyvinyl alcohol (PVA) is generally produced by polymerizing a vinyl monomer, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F118/08C08F8/00C08F6/00
CPCC08F6/00C08F8/00C08F118/08C08L29/04
Inventor 吕惠霞秦庆伟胡腊梅朱灵玲彭达平
Owner CHINA PETROCHEMICAL CORP
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