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Preparation method for vinyl modified polyvinyl alcohol

A polyvinyl alcohol and vinyl technology, applied in the field of preparation of modified polyvinyl alcohol, can solve the problems of difficult to obtain emulsion polymerization, high surface tension, no water resistance, etc., and achieve good water solubility, good viscosity stability, and water resistance. Sex-enhancing effect

Active Publication Date: 2014-04-16
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Partially alcoholyzed PVA is generally used in ordinary process formulas, but if the emulsion is required to have better water resistance, it is not suitable to use partially alcoholyzed PVA, because partially alcoholyzed PVA itself has no water resistance
In order to improve water resistance, it is required to use completely alcoholyzed PVA, but the surface tension of the completely alcoholyzed PVA aqueous solution is high, and it is difficult to obtain stable emulsion polymerization

Method used

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  • Preparation method for vinyl modified polyvinyl alcohol
  • Preparation method for vinyl modified polyvinyl alcohol
  • Preparation method for vinyl modified polyvinyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of vinyl modified polyvinyl alcohol, according to the following steps:

[0032] 1), initial feeding

[0033] Add 84-87 parts of soft water, 0.04-0.06 parts of reducing agent sodium bisulfite, and 0.4-0.6 parts of emulsifier sodium vinyl sulfonate into the high-pressure stainless steel reaction kettle, tighten the lid, and stir evenly at room temperature at a speed of 150-210rpm. Stand still for 25-35 minutes;

[0034] 2) Replacement in the kettle

[0035] Use 8~12bar N 2 Replace twice, and then replace twice with 8-12bar ethylene, and each replacement lasts for 3-5min;

[0036] 3) Add monomers and oxidants for polymerization

[0037] After replacing the inside of the kettle, use a high-pressure metering pump to add 20 to 25 parts of vinyl acetate monomer at full speed, and feed in ethylene monomer to control the pressure in the kettle to 3 to 10 bar. Add 0.05-0.06 parts of oxidant ammonium persulfate to the high-pressure metering pump at full speed....

Embodiment 2

[0056] A kind of preparation method of vinyl-modified polyvinyl alcohol, what this preparation method adopted is emulsion polymerization; It comprises the following steps:

[0057] 1. Dissolve 0.08 parts by weight of sodium bisulfite in water and 0.6 parts by weight of sodium vinylsulfonate in water and add them together into a 10L high-pressure reactor. The total amount of water used is 82 parts. Tighten the lid of the feeding port and test for leaks Pressure test, start stirring, set the speed at 210rpm, stir evenly, and let stand for 35min;

[0058] 2. Use 12bar N 2 Substitute twice, and then replace twice with 12bar ethylene, and each replacement lasts for 3 minutes;

[0059] 3. Use a high-pressure metering pump to add 40 parts by weight of vinyl acetate monomer at full speed, feed the vinyl monomer, set the pressure in the kettle to 3 bar, and when the temperature in the kettle reaches 65°C, dissolve 0.045 parts by weight of ammonium persulfate in water , use a high-pre...

Embodiment 3

[0067] A kind of preparation method of vinyl modified polyvinyl alcohol, it carries out according to the following steps:

[0068] 1. Dissolve 0.02 parts by weight of sodium bisulfite in water and 0.2 parts by weight of sodium vinylsulfonate in water and add them together into a 10L high-pressure reactor. The total amount of water used is 88 parts. Tighten the lid of the feeding port and test for leaks Test the pressure, turn on the stirring, set the speed to 150rpm, stir evenly, and let stand for 30min;

[0069] 2. Use 8bar N 2 Replace twice, and then replace twice with 8bar ethylene, and each replacement lasts for 4 minutes;

[0070] 3. Use a high-pressure metering pump to add 10 parts by weight of vinyl acetate monomer at full speed, feed the vinyl monomer, set the pressure in the kettle to 20 bar, and when the temperature in the kettle reaches 55°C, dissolve 0.065 parts by weight of ammonium persulfate in water , use a high-pressure metering pump to pump into the kettle ...

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Abstract

The invention relates to a preparation method for vinyl modified polyvinyl alcohol. With 82-88 parts of water, 0.02-0.08 part of a reducing agent, 0.2-0.6 part of an emulsifier, 10-40 parts of a vinyl acetate monomer, 0.045-0.065 part of an oxidizing agent and vinyl monomer as raw materials, the vinyl modified polyvinyl alcohol is prepared by the steps of initial charging, replacement in kettle, polymerization reaction, demulsification purification and saponification. Specifically, the dosage of the vinyl monomer is calculated according to a dosage needed by an introduction reaction time of 3.5-4.5h when introducing the vinyl monomer into the kettle with an internal pressure of 3-20bar. The emulsifier is reactive sulfonate. The prepared vinyl modified polyvinyl alcohol is applied as a polymerization additive into emulsion polymerization, overcomes the disadvantages of poor water resistance, unstable polymerization system and the like in conventional PVA (polyvinyl alcohol), and has significantly enhanced water resistance. With good water solubility, the vinyl modified polyvinyl alcohol can fully satisfy the requirements of being used as a polymerization additive. At the same time, when the vinyl modified polyvinyl alcohol is used as a polymerization additive, the polymerization system has excellent stability, and the particle size distribution is improved significantly.

Description

technical field [0001] The invention relates to a preparation method of a polymerization assistant used in emulsion polymerization of vinyl acetate, VAE, etc., in particular to a preparation method of modified polyvinyl alcohol. Background technique [0002] Polyvinyl alcohol (PVA) is an important emulsion polymerization assistant with excellent performance. It is usually used as a protective colloid in the emulsion polymerization of vinyl acetate, VAE, etc. Partially alcoholyzed PVA is generally used in ordinary process formulas, but if the emulsion is required to have better water resistance, it is not suitable to use partially alcoholyzed PVA, because partially alcoholyzed PVA itself has no water resistance. In order to improve water resistance, it is required to use completely alcoholyzed PVA, but the surface tension of completely alcoholyzed PVA aqueous solution is high, and it is difficult to obtain stable emulsion polymerization. Contents of the invention [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/06C08F228/02C08F2/26C08F218/08C08F8/00
Inventor 窦玉芹吴永忠黎园廖永康任文革胡腊梅何灵芝王培发
Owner CHINA PETROCHEMICAL CORP
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