Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Water insoluble modified polyvinyl alcohol coating liquid and its producing process

A polyvinyl alcohol coating, polyvinyl alcohol technology, applied in the direction of coating, can solve the problems of increased air permeability, long production cycle, excessive addition amount, etc., to improve processability, prevent gas permeation, excellent The effect of water resistance

Inactive Publication Date: 2005-10-19
刘建林
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In barrier packaging materials, polyvinyl alcohol PVA is a polyhydroxy polymer with a molecular formula of CH 2 -CHOHn, strong water absorption, soluble in water, due to its intermolecular hydrogen bond, high density, good barrier performance, but its high melting point and low decomposition temperature, due to these structural characteristics of PVA, it is difficult for thermoplastic processing
Most of the currently commercially available PVA films are produced by solution casting method, but the disadvantages of casting method are: long production cycle, low production efficiency, film thickness, unstable quality, high cost, strong water absorption of the film, soluble In water, thereby limiting the popularization and application of PVA film, but in the prior art, adopt melamine class to make modifying agent, although have solved the problem that PVA coating is insoluble in water after film formation, but because in the modification process of PVA Among them, if the amount of plasticizer and modifier is too large, the purity will be reduced, the air permeability will be increased, and the gas barrier performance will be greatly affected by temperature and humidity, and the shelf life of the coating solution is short, which must be within 3-7 hours. Otherwise, it will become jelly-like and cannot be used. Therefore, it can only prepare the coating liquid for its own use, which cannot meet the requirements of being sold as a commodity; and it must be produced with an expensive special coating machine , low output, high energy consumption, and high manufacturing costs restrict its wide application. The base film is polypropylene PP with a thickness of 25 μm, the thickness of the polyvinyl alcohol coating is 10 μm, and its oxygen transmission rate is 3 cm 3 / m 2 ·24h·0.1Mpa, the water vapor transmission rate is 4g / m 2 24 hours
Aluminum foil is used as the barrier layer. Because it is opaque, it cannot be applied to occasions that require transparent packaging. Moreover, its price is relatively high, and it cannot meet the social requirements for high-barrier packaging.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: This embodiment is by the mixture of 8% polyvinyl alcohol, 15% methanol and ethanol, 1% clay, 10% melamine formaldehyde resin, 0.1% hydrochloric acid, 1% BP-4, 0.05 % of ethylene oxide compounds, and 64.85% of water. After fully mixing the above proportioned polyvinyl alcohol, the mixture of methanol and ethanol, clay and water, heat up, stir, keep warm when the temperature reaches 90-95°C, and fully dissolve the polyvinyl alcohol, and wait until the temperature drops to normal temperature , add the melamine-formaldehyde resin, BP-4 and ethylene oxide compound of the above ratio, and fully stir; before starting to use, add hydrochloric acid, and fully stir to obtain the modified polyvinyl alcohol coating with good water resistance of the present invention. cloth liquid. Coat the product of this embodiment with a thickness of 4 μm on a polypropylene PP base film with a thickness of 25 μm. After drying and forming a film, the oxygen transmission rate is 0.3...

Embodiment 2

[0027] Embodiment 2: The present embodiment is made of 7% polyvinyl alcohol, 30% ethanol, 5% nano silicon oxide, 0.5% melamine formaldehyde resin, 5% phosphoric acid, 5% oxirane compound and ethyl alcohol A mixture of glycol ethers consisting of 0.3% alcohol amine titanate and 47.2% water. After fully mixing the polyvinyl alcohol, ethanol, nano-silica, alcoholamine titanate and water in the above ratio, heat up and stir, and keep it warm when the temperature reaches 90-95°C to fully dissolve the polyvinyl alcohol. After cooling down to normal temperature, add the mixture of melamine-formaldehyde resin, ethylene oxide compound and glycol ether in the above ratio, and fully stir; before starting to use, add phosphoric acid, and fully stir to obtain the water-insoluble Modified polyvinyl alcohol coating solution. Coating the product of this example with a thickness of 2 μm on a polyamide PA base film with a thickness of 20 μm, after drying and forming a film, its oxygen transmis...

Embodiment 3

[0028] Embodiment 3: present embodiment is by the mixture of 1% polyvinyl alcohol, 20% methyl alcohol, 0.01% clay and nano-titanium oxide, 2.9% melamine formaldehyde resin, 3% phosphoric acid, 0.6% BP-4 , 0.01% aminosilane and 72.48% water. After fully mixing the mixture of polyvinyl alcohol, methanol, clay and nano-titanium oxide, aminosilane and water, heat up and stir, and keep warm when the temperature reaches 90-95°C to fully dissolve the polyvinyl alcohol. After the temperature is lowered to normal temperature, add the melamine formaldehyde resin and BP-4 in the above ratio, and stir thoroughly. Before starting to use, add phosphoric acid and stir thoroughly to obtain the water-insoluble modified polyvinyl alcohol coating solution of the present invention. . Coating the product of this embodiment with a thickness of 5 μm on a polyethylene PE base film with a thickness of 65 μm, after drying and forming a film, its oxygen transmission rate is 0.31 cm 3 / m 2 ·24h·0.1Mpa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The water insoluble modified polyvinyl alcohol coating liquid consists of polyvinyl alcohol, regulator, inorganic matter, crosslinking agent, catalyst and water. The water insoluble modified polyvinyl alcohol coating liquid includes two components, the component A is prepared through mixing all the material except catalyst and heating at certain temperature, and the component B is catalyst. When used, the two components, A and B, are mixed through stirring, and the mixture forms water insoluble film. The foamed film has excellent processibility, high reflectivity to ultraviolet light and infrared light, high wear resistance, low transmissibility and high adhesion to substrate, and is used in product package.

Description

1. Technical field [0001] The invention belongs to a modified polyvinyl alcohol coating solution and a production process thereof. 2. Background technology [0002] In barrier packaging materials, polyvinyl alcohol PVA is a polyhydroxy polymer with a molecular formula of CH 2 -CHOHn, strong water absorption, soluble in water, due to its intermolecular hydrogen bond, high density, good barrier performance, but its high melting point and low decomposition temperature, due to these structural characteristics of PVA, it is difficult for thermoplastic processing . Most of the currently commercially available PVA films are produced by solution casting method, but the disadvantages of casting method are: long production cycle, low production efficiency, film thickness, unstable quality, high cost, strong water absorption of the film, soluble In water, thereby limiting the popularization and application of PVA film, but in the prior art, adopt melamine class to make modifying agen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/04
Inventor 刘建林
Owner 刘建林
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products