Modified polyvinyl alcohol and preparation method thereof

A polyvinyl alcohol, modification technology, applied in the field of polymer chemistry, can solve the problems of difficult melting processing, narrow processing window, etc., and achieve the effect of facilitating industrial production, changing structure and regularity, and simple preparation method

Active Publication Date: 2017-06-16
SINOPEC SICHUAN VINYLON FACTORY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102603954 uses a long-chain branched vinyl carboxylate and vinyl acetate to copolymerize to obtain polyvinyl alcohol that can be melt-processed. Although the amount of monomers involved in the copolymerization is small, its melting temperature is 190-210 ° C, which is still relatively high. High, narrow processing window, difficult to melt process

Method used

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  • Modified polyvinyl alcohol and preparation method thereof
  • Modified polyvinyl alcohol and preparation method thereof
  • Modified polyvinyl alcohol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing melt-processable modified polyvinyl alcohol, as follows:

[0047] (1) Initial feeding

[0048] 45 parts of methanol, 55 parts of vinyl acetate monomer, 0.2 part of composite initiator (AIBN: benzoyl peroxide=2:5) are put into the reactor; then 4 parts of vinyl ethylene carbonate monomer, Feed at one time into the reaction system over 1.5 hours, slowly raise the temperature to 63°C, polymerize for 5 hours, and add 0.6 parts of sorbic acid after the reaction.

[0049] (2) Blow out residual orders

[0050] Raise the external temperature to 85°C, remove unreacted monomers in the reaction product, and obtain a resin solution of polyvinyl acetate copolymer.

[0051] (3) Dissolving saponification

[0052] The resin solution of vinyl acetate-branched vinyl random copolymer obtained above is prepared into a solution with a mass fraction of 20% by methanol, and the product of modified polyvinyl alcohol copolymer is obtained by adding lye for alcoholysis ...

Embodiment 2

[0081] Each parameter selection is as shown in Table 1 below, and other operating steps are the same as in Example 1.

[0082]

[0083]

[0084]

[0085]

[0086] Note: A1: Vinyl isobutyl ether; A2: Vinyl tert-butyl ether; A3: Vinyl ethylene carbonate; A4: Butyl acrylate; A5: Vinyl cyclohexyl ether;

[0087] A6: ethylene glycol monoallyl ether; A7: butyl acrylate: ethyl acrylate = 3: 1; A8: vinyl isobutyl ether: vinyl tertiary butyl ether = 2: 1; A9: 3,4-di Acetoxy-1-butene; A10: vinyl ethylene carbonate: vinyl ethyl carbonate = 1:2

[0088] From group 1 to group 16 schemes in Table 1, it can be seen that the scheme of group 3 is relatively excellent, that is, methanol system, composite initiator (AIBN: tert-butyl peroxyacetate=1:3), reaction temperature 65 ℃, reaction 5 hours, the conversion rate can be controlled at about 70%, the modified PVA obtained by alcoholysis has moderate crystallinity and melting point, and the sample is soluble in water; if the branche...

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Abstract

The invention relates to modified polyvinyl alcohol, which has the following structure formula defined in the specification, wherein x, y and z are integers, x is more than 1 and is less than or equal to 500, y is more than 1 and is less than or equal to 2000, z is more than 1 and is less than or equal to 200, y is more than x, y is more than z, R1 is an oxygen atom or -CO- or -(CH-OH)-, and R2 is alkyl, alkoxy or hydroxyl-terminated alkyl. According to the present invention, the monomer copolymerization consumption is less, the reaction rate is moderate, the conversion rate of the prepared vinyl acetate-branched vinyl copolymer is 40-80%, the alcoholysis degree of the alcoholysis product is 98-99.8 mol%, the crystallinity is less than 20%, the melting point is 160-195 DEG C, the viscosity is 3.0-25.0 mPa.S (20 DEG C, 4% aqueous solution), and the obtained product can be subjected to melting processing and has good processability.

Description

technical field [0001] The invention relates to a modified polyvinyl alcohol and a preparation method thereof, belonging to the field of polymer chemistry. Background technique [0002] Polyvinyl alcohol (PVA) is a polar, non-toxic, crystalline polymer with good biocompatibility, widely used in coatings, adhesives, dispersants, chemical fibers, films, packaging materials and biomedical materials and other fields. The molecular chain structure of PVA is regular, and contains a large number of polar groups - hydroxyl groups. It is very easy to form intramolecular or intermolecular hydrogen bonds between adjacent hydroxyl groups, so that its melting temperature is between 220-240 ° C, which is close to the decomposition temperature. Thermoplastic processing greatly limits the scope of use of polyvinyl alcohol. [0003] In order to solve the problem of difficult thermoplastic processing of traditional polyvinyl alcohol, a lot of research has been done on the modification techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F224/00C08F216/18C08F220/18C08F216/16C08F8/12
CPCC08F8/12C08F218/08C08F220/1804
Inventor 夏和生彭达平郑丽任文革范文如
Owner SINOPEC SICHUAN VINYLON FACTORY
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