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A special adhesive for polyvinyl alcohol/polyolefin composite film and its preparation method

A composite film and polyvinyl alcohol technology, applied in the direction of ester copolymer adhesives, adhesive types, chemical instruments and methods, etc., can solve problems such as difficult to achieve, high price, difficult processing, etc.

Inactive Publication Date: 2017-08-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high barrier materials such as EVOH, PVDC, etc. are not only expensive, but also difficult to process, and their barrier properties are not as good as PVA; although the barrier properties of composite films can be greatly improved by using aluminum thin films, the packaging materials can only be Opaque packaging materials, and the use of PVA for composite production of packaging materials can greatly improve the barrier properties of the composite film, and can also maintain the transparency of the composite film; at the same time, PVA is a high-quality and low-cost material with excellent barrier properties. Practical value for mass development use
[0003] Since polyvinyl alcohol PVA is a highly polar polymer material, and other film substrates polyolefin (PO) plastic films (PE, PP, etc.) to be used in combination are all non-polar polymer materials, use them directly Composite is very difficult and elusive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical components of the mixed monomer and the proportion of each chemical component in the mixed monomer (wt%):

[0032] Methyl methacrylate 20

[0033] Isooctyl acrylate 45

[0034] Hydroxyethyl Acrylate 20

[0035] Methacrylic acid 10

[0036] Acrylamide 5

[0037] The above components are mixed in proportion, and the components are synthesized into adhesive mixed monomers, then mixed with isopropanol, and solution polymerized in a polymerization kettle with a condensation reflux device (wherein the mass ratio of mixed monomers to isopropanol is 55:45; the amount of the catalyst benzoyl peroxide is 1.5% of the mass of the mixed monomers), the catalyst benzoyl peroxide is dissolved in isopropanol and added to the reactor by dropwise addition, the process of solution polymerization is: Polymerize at 65°C for 60 minutes, then raise the temperature to 75°C for 90 minutes, and finally raise the temperature to 85°C for 40 minutes, cool to room temperature, and di...

Embodiment 2

[0039]The chemical components of the mixed monomer and the proportion of each chemical component in the mixed monomer (wt%):

[0040] Methyl methacrylate 25

[0041] Ethyl acrylate 15

[0042] Butyl methacrylate 10

[0043] Hydroxypropyl Acrylate 35

[0044] Acrylic 5

[0045] Acrylamide 10

[0046] The above components are mixed in proportion, the components are synthesized into adhesive mixed monomers, then mixed with isopropanol, and solution polymerized in a polymerization kettle with a condensation reflux device (wherein the mass ratio of mixed monomers to isopropanol is 50:50; the amount of catalyst benzoyl peroxide is 0.5% of the mass of mixed monomers), the catalyst benzoyl peroxide is dissolved in isopropanol and added to the reactor by dropwise addition; the process of solution polymerization is: Polymerize at 60°C for 30 minutes, then raise the temperature to 70°C for 90 minutes, and finally raise the temperature to 80°C for 60 minutes; cool to room temperature...

Embodiment 3

[0048] The chemical components of the mixed monomer and the proportion of each chemical component in the mixed monomer (wt%):

[0049] Methyl methacrylate 15

[0050] Ethyl methacrylate 20

[0051] Butyl acrylate 35

[0052] Glycidyl methacrylate 20

[0053] Methacrylic acid 5

[0054] N-methylolacrylamide 5

[0055] The above components are mixed in proportion, and the components are synthesized into adhesive mixed monomers, then mixed with ethanol, and carried out solution polymerization in a polymerization kettle with a condensing reflux device (wherein the mass ratio of the mixed monomers to isopropanol is 65: 35; the amount of the catalyst benzoyl peroxide is 1.2% of the mass of the mixed monomers), the catalyst benzoyl peroxide is dissolved in ethanol and then added to the reactor by dropwise; the process of solution polymerization is: polymerization at 60°C for 40 minutes, then raise the temperature to 75°C for 90 minutes, and finally raise the temperature to 80°C ...

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PUM

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Abstract

The invention discloses a special adhesive for polyvinyl alcohol / polyolefin composite film and a preparation method thereof. This special adhesive is a mixture of oily acrylate or methacrylate monomers, water-based acrylate monomers, acrylic or methacrylic acid, acrylamide or N-methylol acrylamide; Benzoyl peroxide equivalent to 0.5-2.0% of the mass of the mixed monomer is used as a catalyst. It is polymerized in an aqueous low-boiling alcohol solvent at 60-90°C for 150-240 minutes. The solid content of the adhesive after polymerization is 50‑70%. This adhesive is used for PVA / polyolefin (PO) film composite, and the peel strength of the composite film is ≥2.0N / 15min.

Description

technical field [0001] The invention relates to the field of adhesive materials, in particular to a special adhesive for polyvinyl alcohol / polyolefin composite films and a preparation method thereof. Background technique [0002] Polyolefin (PO) plastic (PE, PP, etc.) films are widely used in the packaging of fruits, vegetables, and other foods because of their non-toxic, transparent, and water vapor barrier properties. However, in use, since polyolefin plastic films have low barrier properties to oxygen, carbon dioxide, etc., the packaged food is prone to deterioration or quality degradation due to oxidation within a certain period of time. In order to improve the performance of packaging films, at present: 1) Use films with excellent barrier properties for composite use, such as using EVOH, PVDC and other films with excellent barrier properties to prepare films for packaging food; 2) Aluminum plating polyolefin films etc., are all to improve the barrier properties of poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J133/14C09J133/10C08F220/18C08F220/14C08F220/28C08F220/06C08F220/56C08F2/06C08F220/32C08F220/58B32B7/12B32B27/08B32B27/30B32B27/32B65D65/40
Inventor 崔跃飞
Owner SOUTH CHINA UNIV OF TECH