Carboxyl modified polyvinyl alcohol and method for preparing same

A polyvinyl alcohol and carboxyl modification technology, applied in the field of polyvinyl alcohol, can solve the problems of high energy consumption, large pollution, long process route, etc., and achieve the effect of high film strength, high polymerization efficiency and good characteristics

Active Publication Date: 2012-10-17
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process route of this method is long, and a large amount of solvent needs to be recovered and the lye is

Method used

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  • Carboxyl modified polyvinyl alcohol and method for preparing same
  • Carboxyl modified polyvinyl alcohol and method for preparing same
  • Carboxyl modified polyvinyl alcohol and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0057] The preparation method of carboxy-modified polyvinyl alcohol is as follows:

[0058] Arrange three 2-liter jacketed glass polymerization reactors equipped with stirring devices and reflux condensers in series. After replacing the oxygen in these three polymerization reactors with nitrogen, an automatic weighing system is adopted, according to the process conditions in Table 1. Vinyl acetate, methanol, methanol solution with a mass concentration of 1.5% azobisisobutyronitrile, and methanol solution with a mass concentration of 15% itaconic acid are continuously fed into the first polymerization kettle after preheating, and after reaching the specified one-pot residence time Finally, control the liquid level of the first kettle to be constant, and use the gear pump to continuously send the polymerization liquid of the first polymerization kettle to the second polymerization kettle, and simultaneously add the above-mentioned itaconic acid methanol that accounts for 40% of t...

Embodiment 9

[0079] A kind of preparation method of carboxy-modified polyvinyl alcohol:

[0080] (1) Raw material preparation:

[0081] Monomer: vinyl acetate, 0.7wt% maleic acid accounting for the weight of vinyl acetate to prepare a maleic acid ethanol solution with a mass concentration of 10wt%;

[0082] Solvent: account for the ethanol of vinyl acetate weight 20wt%;

[0083] Initiator: Azobisisobutyronitrile ethanol solution with a mass concentration of 2.0 wt% prepared from 0.1wt% azobisisobutyronitrile by weight of vinyl acetate;

[0084] (2) Preparation method:

[0085] Add the vinyl acetate monomer, maleic acid ethanol solution and azobisisobutyronitrile ethanol solution prepared above into the first polymerization kettle, wherein vinyl acetate and azobisisobutyronitrile ethanol solution are all added, maleic acid ethanol The solution is added to account for 50% of the total weight of the maleic acid ethanol solution, the polymerization reaction temperature is 60 ± 5 ° C, and the ...

Embodiment 10-12

[0086] Examples 10-12: Carry out according to the following materials and parameters, and the others are the same as in Example 9. The obtained carboxyl-modified polyvinyl alcohol of the present invention has excellent crosslinking reaction performance, water solubility, dispersion performance, rheological performance, Anti-"skinning" properties and low foaming.

[0087]

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Abstract

Provided is carboxyl modified polyvinyl alcohol, which is prepared with raw materials of a monomer, an initiator and a solvent. The monomer comprises vinyl acetate and a second comonomer, the second comonomer is one solvent or a combination of any solvents selected from maleic acid, itaconic acid, glutaconic acid and itaconic acid anhydride. The preparation method comprises that the continuous polymerization in three kettles is adopted; the vinyl acetate monomer, the second comonomer prepared with the above solvents and the initiator solution are added into three serial polymerization kettles to react; the residence time of the reaction in each polymerization kettle is 60-180 min; and the carboxyl modified polyvinyl alcohol is then prepared through alcoholysis. The method has advantages of high polymerization efficiency, high production efficiency and simple operation. The carboxyl modified polyvinyl alcohol is characterized by excellent cross linking reaction performance, water solubility performance, dispersing performance, rheological performance, anti-skinning performance and anti-foaming performance.

Description

technical field [0001] The invention relates to polyvinyl alcohol, in particular to a carboxyl-modified polyvinyl alcohol and a preparation method thereof. Background technique [0002] Carboxyl-modified polyvinyl alcohol is an important class of functional polymers. After introducing carboxyl groups with strong hydrophilicity and high reactivity into the PVA molecular chain, these carboxyl-modified polyvinyl alcohols have the properties of conventional polyvinyl alcohol In addition, the newly introduced carboxyl groups can also endow polyvinyl alcohol molecules with some special properties, such as high water solubility and cross-linking reactivity, so that these carboxyl-modified PVAs have excellent cross-linking reaction performance, water solubility, dispersion performance, Rheological properties, anti-"skinning" properties and low foaming properties have good application prospects and can be widely used in special paper, adhesives, cement slurry for oil field cementing ...

Claims

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Application Information

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IPC IPC(8): C08F218/08C08F222/02C08F8/12
Inventor 汪宝林胡腊梅李永江廖永康黎园
Owner CHINA PETROCHEMICAL CORP
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