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Label and preparation method thereof

A label and substrate technology, applied in adhesive types, polyurea/polyurethane adhesives, unsaturated alcohol copolymer adhesives, etc., can solve problems such as unfavorable sorting, recycling and reproduction

Active Publication Date: 2018-03-09
GUANGDONG TENGEN IND GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When recycling labeled containers, because the labels cannot be removed quickly, and the labels and containers may be of different categories, it is not conducive to sorting, recycling and reproducing

Method used

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  • Label and preparation method thereof
  • Label and preparation method thereof

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Experimental program
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preparation example Construction

[0070] The preparation method of the above-mentioned label comprises the following steps:

[0071] Weigh 18-30 parts of starch and an appropriate amount of water in parts by weight, about 25-60 parts of water, put them into a reaction vessel, stir evenly, and obtain starch slurry; add sodium hydroxide to adjust the pH value of the starch slurry to 8.8-9.5 , start to heat up, control the temperature of the starch slurry at 44-47°C, keep stirring, add 0.1-1.2 parts of sodium hypochlorite, react for 20-45 minutes, add an appropriate amount of hydrogen peroxide, and continue to oxidize the starch slurry until the sample of the oxidized starch slurry is added dropwise After potassium iodide detection, until the color of the starch slurry does not change, the oxidized starch slurry is obtained.

[0072] The temperature is 44-47°C, the pH value is 8.8-9.5, the activity of sodium hypochlorite and hydrogen peroxide is relatively high, and the oxidation efficiency is relatively high. S...

Embodiment 1

[0081] The label of this embodiment includes a substrate, an adhesive layer attached to one side of the substrate, and a release paper attached to the adhesive layer. The base material is label paper, the side of the base material away from the adhesive layer is provided with a printing surface, and the release paper is ordinary release paper. The adhesive layer is made of the following components by weight:

[0082] 18 parts of starch;

[0083] 4 parts of water-based polyurethane;

[0084] 7 parts of sodium alginate;

[0085] Oxidant: 0.1 parts of sodium hypochlorite, 1.5 parts of hydrogen peroxide;

[0086] 0.5 parts of sodium hydroxide;

[0087] 9 parts of toluene diisocyanate;

[0088] 1 part polyvinyl alcohol;

[0089] Plasticizer: 1.5 parts of glycerin

[0090] Filler: 4 parts of bentonite;

[0091] Defoamer: 1.8 parts of a mixture of tributyl phosphate and diethyl silicone oil, the mass ratio of tributyl phosphate to diethyl silicone oil is 1:1;

[0092] Water ...

Embodiment 2

[0099] The label of this embodiment includes a substrate, an adhesive layer attached to one side of the substrate, and a release paper attached to the adhesive layer. The substrate is label paper, the side of the substrate away from the adhesive layer is provided with a printing surface, and the release paper is ordinary release paper. The adhesive layer is made of the following components by weight:

[0100] 20 parts of starch;

[0101] 3 parts of water-based polyurethane;

[0102] 7.5 parts of sodium alginate;

[0103] Oxidant: 0.3 part of sodium hypochlorite, 1.0 part of hydrogen peroxide;

[0104] 0.7 parts of sodium hydroxide;

[0105] 7 parts of toluene diisocyanate;

[0106] 2.5 parts of polyvinyl alcohol;

[0107] Plasticizer: 0.9 parts of ethylene glycol

[0108] Filler: 3.5 parts of a mixture of bentonite and titanium dioxide, the mass ratio of bentonite and titanium dioxide is 1:1.5;

[0109] Defoamer: 1.5 parts of tributyl phosphate;

[0110] Water in mode...

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Abstract

The invention relates to a label and a preparation method thereof. The label comprises a base material and an adhesive layer, wherein the adhesive layer is prepared from the following components in parts by weight: 18 to 30 parts of starch, 3 to 8 parts of waterborne polyurethane, 6 to 10 parts of sodium alginate, 1.3 to 3.9 parts of oxidant, 0.5 to 2.5 parts of sodium hydroxide, 7 to 18 parts ofisocyanate, 1 to 2.5 parts of polyvinyl alcohol, 5 to 10.5 parts of additive and water. The starch is subjected to oxidative degradation through the oxidant; in the environment that the polyvinyl alcohol exists, a chain segment of the starch and the isocyanate generate cross-linking condensation to form a reticular framework; the waterborne polyurethane and the sodium alginate are enwrapped in thereticular framework; the bonding strength is improved; the reticular framework of the chain segment of the starch and the isocyanate has better water resistance; the label is enabled to be difficultin moisture absorption in a normal-temperature state to lose viscosity; after the label is soaked in an aqueous solution, which is at 75 DEG C or above, for 2min to 8min, the label can be separated from an object to which the label is attached and the label to which the label is attached is convenient to classify and recover.

Description

technical field [0001] The invention relates to the technical field of daily necessities, in particular to a label and a preparation method thereof. Background technique [0002] Due to the wide variety of products today, it is generally required to attach labels on the surface of the product or on the surface of the packaging container of the product to identify and classify the product or record relevant information. Such as medicines, beverages, condiments, express parcels, etc., the traditional label application is to discard the container and the label attached to the container together with the digestion of the product. As people's concepts of energy saving, green environmental protection, recycling, and sustainable development strengthen, more and more discarded garbage is recycled. When recycling labeled containers, since the label cannot be removed quickly, and the category of the label and the container may be different, it is not conducive to sorting, recycling a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F3/10C09J103/10C09J175/04C09J105/04C09J129/04C09J11/06C09J11/04C08B31/18
CPCC08B31/185C08K2003/2241C08L2205/035C09J11/04C09J11/06C09J103/10G09F3/10C08L75/04C08L5/04C08L29/04C08K5/053C08K3/346C08K3/22C08K3/36
Inventor 罗耀东贾强童德兴
Owner GUANGDONG TENGEN IND GRP CO LTD