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Method for improving water-solubility of polyethylene with high degree of polymerization

A polyvinyl alcohol, high degree of polymerization technology, applied in the field of polymer preparation, can solve the problems affecting the physical and chemical properties of the product, difficult to maintain the product characteristics of polyvinyl alcohol, etc., to shorten the dissolution time, improve water solubility, accelerate penetration effect

Inactive Publication Date: 2012-10-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although physical or chemical modification methods have improved the water solubility of polyvinyl alcohol to a certain extent, the glass transition temperature, melting temperature, decomposition temperature, and crystallization properties of the chemically modified polyvinyl alcohol itself have also changed, affecting Physical and chemical properties of the product
Blending modification is difficult to maintain complete polyvinyl alcohol product characteristics due to the introduction of other blending components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 3 parts of polyvinyl acetate methanol solution with a concentration of 10% and a degree of polymerization of 300 and 94 parts of a methanol solution of polyvinyl acetate with a concentration of 10% and a degree of polymerization of 1600, and add them together to a reaction reaction with electric stirring, a thermometer, and a condenser tube. In the kettle, first stir the solution at a speed of 300 rpm to make it evenly mixed, and when the water bath is heated to 45°C, add 3 parts of 10% sodium hydroxide methanol solution into the reactor at one time to carry out the alcoholysis reaction. Stir the solution vigorously at a speed of 1000 rpm to prevent the polyvinyl alcohol formed by alcoholysis from forming into agglomerates. Stop stirring after 10 minutes of alcoholysis reaction, and keep warm in a water bath at 45°C for 2 hours to complete the alcoholysis. Then filter out the polyvinyl alcohol and wash it with methanol three times , baked in an oven at 50°C for 3 hou...

Embodiment 2

[0022] Put 5 parts of polyvinyl acetate methanol solution with a concentration of 10% and a degree of polymerization of 300 and 92 parts of a methanol solution of polyvinyl acetate with a concentration of 10% and a degree of polymerization of 1600, and add them together to a reaction kettle equipped with electric stirring, a thermometer, and a condenser , first stir the solution at a speed of 300 rpm to make it evenly mixed, and when the water bath is heated to 45°C, add 3 parts of 10% sodium hydroxide methanol solution into the reaction kettle at one time to carry out the alcoholysis reaction. Stir the solution vigorously at a speed of rpm to prevent the polyvinyl alcohol produced by alcoholysis from forming into agglomerates. After alcoholysis for 10 minutes, stop stirring and keep warm in a water bath at 45°C for 2 hours to complete the alcoholysis. Then filter out the polyvinyl alcohol and wash it with methanol three times. Baked in an oven at 50°C for 3 hours to obtain dry...

Embodiment 3

[0024] Add 10 parts of polyvinyl acetate methanol solution with a concentration of 10% and a degree of polymerization of 300 and 87 parts of a methanol solution of polyvinyl acetate with a concentration of 10% and a degree of polymerization of 1600, and add them together to a reaction with electric stirring, a thermometer, and a condenser tube. In the kettle, first stir the solution at a speed of 300 rpm to make it evenly mixed, and when the water bath is heated to 45°C, add 3 parts of 10% sodium hydroxide methanol solution into the reactor at one time to carry out the alcoholysis reaction. Stir the solution vigorously at a speed of 1000 rpm to prevent the polyvinyl alcohol formed by alcoholysis from forming into agglomerates. Stop stirring after 10 minutes of alcoholysis, and keep it in a water bath at 45°C for 2 hours. Dry at ℃ to obtain polyvinyl alcohol. The modified polyvinyl alcohol is placed in deionized water at a constant temperature of 90 ℃ and magnetically stirred, a...

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Abstract

The invention discloses a method for improving water-solubility of polyethylene with high degree of polymerization, which is characterized in that 3-10 parts of methanol solution of polyvinyl acetate with concentration of 10%-25% and degree of polymerization of 300-500 and 87-100 parts of methanol solution of polyvinyl acetate with concentration of 10%-25% and degree of polymerization of 1600-2400 are added into a reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and mixed with agitation speed of 200-1000 rev / min to enable the solution to be uniform; the temperature is slowly heated to 40-50 DEG C; 3-8 parts of methanol solution of 10% sodium hydroxide is added at one time to the reaction kettle for alcoholysis for 2-15min; white insoluble polyvinyl alcohol is produced; the polyvinyl alcohol is subjected to standing and heat insulation for 1.5-3h at the temperature of 40-50 DEG C to enable alcoholysis to be carried out completely; and then white polyvinyl alcohol is obtained by filtering, washed by methanol for 3 times, and placed in an oven at the temperature of 40-60 DEG for drying, so taht the water-solubility improved polyethylene with high degree of polymerization is obtained.

Description

technical field [0001] The invention relates to a method for improving the water solubility of polyvinyl alcohol with a high degree of polymerization, and belongs to the field of high molecular polymer preparation. technical background [0002] Polyvinyl alcohol is one of the few artificially synthesized polymers that can be water-soluble. It has unique strong adhesion, film flexibility, smoothness, solvent resistance, protective colloid, gas barrier and wear resistance. It is widely used Used in steel, paper, textile, food, construction, wood processing and other industries. Polyvinyl alcohol products are generally powder or granules, and when processed or used, they are usually carried out in an aqueous solution state and involve the dissolution of polyvinyl alcohol. Since polyvinyl alcohol has the characteristics of polyhydric groups, it is easy to form hydrogen bonds and crystallize, and its solubility in water is not good. In particular, polyvinyl alcohol with a high ...

Claims

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Application Information

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IPC IPC(8): C08F116/06C08F118/08C08F8/00
Inventor 张军华党鋆
Owner SICHUAN UNIV
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