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Oxidized polyvinyl alcohol and solid phase modification method thereof

A technology for oxidizing polyvinyl alcohol and polyvinyl alcohol, which is applied in textiles and papermaking, fiber treatment, plant fiber, etc., can solve the problems of high cost, wastewater treatment, and low efficiency, and achieve high production efficiency, low cost, and expansion The effect of application range

Inactive Publication Date: 2015-05-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, these methods for oxidizing PVA are all carried out in aqueous solution, so there are still a series of problems of the above-mentioned chemical conversion modification in aqueous solution, such as high cost, low efficiency, and the problem of waste water treatment

Method used

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  • Oxidized polyvinyl alcohol and solid phase modification method thereof
  • Oxidized polyvinyl alcohol and solid phase modification method thereof
  • Oxidized polyvinyl alcohol and solid phase modification method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] At room temperature, put 100 parts of granular PVA1799 into the rotary reactor, spray 5.7 parts of water with a pH of 5.0 and 14 parts of 30% hydrogen peroxide under rotary stirring, slowly heat to 40 ° C, and swell for 2 hours; continue to spray water for 6 1 part and 0.3 part of 1% copper sulfate solution, heat up to 70°C after spraying, keep stirring and react for 2 hours; raise the temperature of the obtained oxidized PVA product to 90°C, and vacuum dry to a moisture content of 8%.

[0047] The weight-average molecular weight of this oxidized PVA product is measured to be 4.14×10 4 , the viscosity is 4.6 mPa·s, the carboxyl content is 2.53%, and the carbonyl content is 3.42%.

Embodiment 2

[0049] At room temperature, put 100 parts of pulverized particles PVA1788 into the rotary reactor, spray 6 parts of water with a pH of 2.0 and 20 parts of 30% hydrogen peroxide under rotary stirring, slowly heat to 45 ° C, and swell for 0.5 hours; continue to spray 0.6 parts under stirring A mixed solution of 1% copper chloride solution was heated to 70°C after spraying, and kept stirring for 3 hours to react; the obtained oxidized PVA product was heated to 90°C, and vacuum-dried to a moisture content of 9%.

[0050] Measure the weight average molecular weight of this oxidized PVA product 3.58 * 10 4 , viscosity 4.0 mPa·s, carboxyl content 2.05%, carbonyl content 3.09%.

Embodiment 3

[0052] At room temperature, put 100 parts of flaky particles PVA2699 into the rotary reactor, spray 6.6 parts of water with a pH of 10.0 and 18 parts of 30% hydrogen peroxide under rotating stirring, slowly heat to 50°C, and swell for 4 hours; continue to spray water under stirring The mixture of 6 parts and 0.4 parts of 1% ferrous sulfate solution was sprayed and then heated to 60°C, kept stirring and reacted for 3 hours; the obtained oxidized PVA product was heated to 95°C, and vacuum-dried to a moisture content of 7%.

[0053] Measure the weight average molecular weight of this oxidized PVA product 8.76 * 10 4 , viscosity 10 mPa·s, carboxyl content 1.50%, carbonyl content 2.55%.

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Abstract

The invention discloses an oxidized polyvinyl alcohol prepared by a solid phase modification method. The solid phase modification method comprises the following steps of firstly, swelling the polyvinyl alcohol, diffusing an oxidation reagent into the polyvinyl alcohol body, and heating up to react in the premise of a catalyst. Analyzed and detected by a gel chromatography, the oxidized polyvinyl alcohol has the weight-average molecular weight of 7.03*10<3>-4.14*10<4>; an infrared spectrogram 1717cm<-1> shows that the oxidized polyvinyl alcohol has carboxyl and the absorption peak of carbonyl; the viscosity of the oxidized polyvinyl alcohol is 4.0-10.0mPa.s, the content of the carboxyl is 1.50%-2.53%, and the content of the carbonyl is 2.55%-3.42%. The method is simple to operate, has short production processes, high efficiency, low energy consumption and various products, discharges no wastewater, is lower in price compared with the similar products, has wide application range, is convenient for industrial production, and explores a new way for preparing PVA (poly vinyl alcohol) products with low molecular weight and low viscosity.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol modification and preparation, and in particular relates to an oxidized polyvinyl alcohol (PVA) and a solid-phase modification method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is one of the most common water-soluble polymers. It has good acid resistance, alkali resistance and dry heat resistance. It is soluble in water and almost insoluble in organic solvents. PVA is non-toxic, biodegradable, and has unique strong adhesion, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid, gas barrier properties, abrasion resistance and water resistance after special treatment. sex. Therefore, in addition to being used as fiber and film raw materials, it is also widely used in the production of water-based coatings, adhesives, paper processing agents, emulsifiers, dispersants, and other products, and its application range covers textiles, food, Me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F16/06C08F8/06D06M15/11D06M15/327D06M101/06
Inventor 朱谱新芦燕胡晓孔钦明荆蓉
Owner SICHUAN UNIV
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