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Modified vinyl alcohol-series polymer and its preparation method and use

A vinyl alcohol-based polymer technology, applied in the direction of monocarboxylic acid ester copolymer adhesives, dehydration/demulsification by chemical methods, adhesive types, etc., can solve the problems of difficult active polymerization of vinyl ester monomers, etc.

Inactive Publication Date: 2014-12-03
李汝基
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Since the traditional PVA modified by introducing ionic groups is generally obtained by free radical polymerization and then saponification, and it is difficult to realize active polymerization of vinyl ester monomers, therefore, no ions with star-shaped molecular structure have been seen so far. Examples of sexual group-modified vinyl alcohol polymers

Method used

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  • Modified vinyl alcohol-series polymer and its preparation method and use
  • Modified vinyl alcohol-series polymer and its preparation method and use
  • Modified vinyl alcohol-series polymer and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This example is the preparation of vinyl alcohol polymers modified by cationic groups by the traditional free radical copolymerization method

[0063] A. Polymerization

[0064] Into a 250ml four-necked flask equipped with a stirrer, a constant pressure dropping funnel, nitrogen ventilation and a reflux condensing device, add 100ml of methanol, 0.338mmol of methylenebismethacrylamide, 300mmol of vinyl formate, and Azodiisobutyronitrile (AIBN) 0.45mmol, n-butyl mercaptan (DDT) 0.01mmol. Place the four-necked bottle in a temperature-controlled water bath, blow nitrogen and oxygen for 30 minutes, raise the temperature to 60°C while stirring, and after stirring and reacting at 60°C for 10 minutes, continuously and slowly dropwise add 24mmol ethyleneoxyethyl The dimethylamine-containing 10% ethyleneoxyethyldimethylamine-methanol mixture was dropped within 90 minutes, and the reaction was completed after another 30 minutes.

[0065] B. Saponification

[0066] After the end...

Embodiment 2

[0071] This example is the preparation of vinyl alcohol-based polymers modified by anionic groups by the traditional free radical copolymerization method

[0072] A. Polymerization

[0073] In a 250ml four-necked flask equipped with a stirrer, constant pressure dropping funnel, nitrogen gas and reflux condensing device, add methanol 100ml, ethylene glycol diester dimethacrylate 1.2mmol, vinyl propionate 300mmol, Dibenzoyl peroxide (BPO) 0.9mmol, dodecyl mercaptan (DDT) 0.01mmol. Place the four-necked bottle in a temperature-controlled water bath, blow nitrogen and oxygen for 28 minutes, raise the temperature to 62°C while stirring, and after stirring and reacting at 62°C for 8 minutes, slowly and continuously dropwise add 9mmol of methacryloyloxygen to the system The mixture of ethylsulfonic acid and methanol containing 10% methacryloyloxyethylsulfonic acid was dropped within 120 minutes, and the reaction was completed after another 20 minutes.

[0074] B. Saponification

...

Embodiment 3

[0079] This example is the preparation of vinyl alcohol polymers modified by cationic groups by the traditional free radical copolymerization method

[0080] A. Polymerization

[0081] Into a 250ml four-necked flask equipped with a stirrer, constant pressure dropping funnel, nitrogen gas and reflux condensing device, add methanol 110ml, diisopropenylbenzene 0.27mmol, vinyl acetate 300mmol, azobisisoheptyl Nitrile (ABVN) 0.3mmol, dodecyl mercaptan (DDT) 0.006mmol. Place the four-necked bottle in a temperature-controlled water bath, blow nitrogen and oxygen for 35 minutes, raise the temperature to 58°C while stirring, and stir and react at 58°C for 16 minutes, then continuously and slowly dropwise add 105mmol methacryloyl oxygen The mixture of ethyltriethylammonium chloride and methanol containing 10% methacryloyloxyethyltriethylammonium chloride was dropped within 60 minutes, and the reaction was completed after another 5 minutes.

[0082] B. Saponification

[0083] After th...

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Abstract

The invention discloses a vinyl alcohol-series polymer. The vinyl alcohol-series polymer has a core-arm star-shaped molecule structure comprising a core and vinyl alcohol-series polymer arms connected to the core. The vinyl alcohol-series polymer is characterized in that the arms are modified by ionic groups so that the vinyl alcohol-series polymer which has a star-shaped molecule structure comprising the ionic groups on the polymer arms and is shown in the general formula (I) is formed. The vinyl alcohol-series polymer is a macromolecule comprising a core in the center and multiple radiation linear polymer arms (which is vinyl alcohol-series polymer arms) connected to the core. Compared with linear and random coil polymers having corresponding molecular weights, the vinyl alcohol-series polymer has low viscosity in water. The polymer arms are modified by the ionic groups so that the polymer arms have iconicity. Through the iconicity characteristic, the vinyl alcohol-series polymer can be used as a paper surface sizing agent and a paper inner reinforcing agent for papermaking, a paper wet-part fine filler retention promoter, a waste water treatment flocculating agent, a sludge dehydrant and a crude oil dehydrant.

Description

technical field [0001] The present invention relates to vinyl alcohol-based polymers, in particular to ion-modified and low-viscosity vinyl alcohol-based polymers and compositions containing the polymers. Background technique [0002] Polyvinyl alcohol (hereinafter referred to as PVA), a representative of vinyl alcohol-based polymers, is a hydrophilic water-soluble synthetic polymer widely used in paper processing, textiles, building materials, coatings, etc., as an adhesive for organic and inorganic substances. Binder, compared with other synthetic polymer binders, has the advantages of high bonding strength and excellent film-forming properties. [0003] As a water-soluble polymer, traditional PVA has a high degree of crystallinity due to its relatively regular molecular chain structure and a large number of -OH groups, which make it possible to have hydrogen bonds between molecules and molecules. Sex, but the solubility is not very ideal, and the viscosity is high. At th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/06C08F222/38C08F216/14C08F8/12C08F218/10C08F222/14C08F220/38C08F218/08C08F212/12C08F220/34C08F212/36C08F226/04C08F230/08C08F220/06C08F220/44C08F226/02C09J131/02D21H21/10C02F11/14C10G33/04
Inventor 李汝基郭纬林润惠
Owner 李汝基
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