CN114106718A - Preparation method of PVA-based degradable adhesive tape - Google Patents
Preparation method of PVA-based degradable adhesive tape Download PDFInfo
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- CN114106718A CN114106718A CN202111373886.0A CN202111373886A CN114106718A CN 114106718 A CN114106718 A CN 114106718A CN 202111373886 A CN202111373886 A CN 202111373886A CN 114106718 A CN114106718 A CN 114106718A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/245—Vinyl resins, e.g. polyvinyl chloride [PVC]
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/02—Homopolymers or copolymers of unsaturated alcohols
- C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J189/00—Adhesives based on proteins; Adhesives based on derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2403/00—Presence of starch
- C09J2403/006—Presence of starch in the substrate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2429/00—Presence of polyvinyl alcohol
- C09J2429/006—Presence of polyvinyl alcohol in the substrate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2483/00—Presence of polysiloxane
- C09J2483/005—Presence of polysiloxane in the release coating
Abstract
The invention discloses a preparation method of a PVA-based degradable adhesive tape, which comprises the steps of stirring a mixture containing polyvinyl alcohol (PVA), starch, distilled water and a plasticizer at 100-120 ℃ for 20-30 min, adding a cross-linking agent and a stabilizing agent, and uniformly stirring to prepare a mixture; extruding and blowing the mixture to obtain a semi-finished film; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s, so that a substrate layer is prepared; coating a release layer material on one side of the base material layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer. The packaging material belongs to a degradable product, is green and environment-friendly, has good water resistance and flexibility, avoids the step of removing the adhesive tape when the carton of the adhesive tape is recycled, and reduces the recycling cost of the carton.
Description
Technical Field
The invention belongs to the technical field of preparation of degradable packaging materials, and particularly relates to a preparation method of a PVA-based degradable adhesive tape.
Background
In the prior art, the adhesive tape used in daily express is mostly transparent adhesive tape, most of the adhesive tape is mainly made of high molecular compounds such as polypropylene, polyvinyl chloride and polyethylene glycol terephthalate as base materials, the high molecular materials are not degradable, and the used treatment method mainly comprises landfill and incineration, so that serious harm and burden are brought to the environment. In addition, although the manufacturing cost of the adhesive tape is low, the use of a large amount of the adhesive tape not only wastes resources, but also causes difficulty in recycling the packaging box bonded with the non-degradable adhesive tape, thereby increasing the recycling cost. In addition, kraft paper used by the traditional adhesive tape is a green degradable material, but the cost is high, and the traditional adhesive tape is not suitable for wide application. Therefore, the use of completely biodegradable materials enables the prepared adhesive tape to be completely biodegradable, can reduce the manufacturing cost of the adhesive tape, and is also an important way for improving the environment. In view of the above problems, there is an urgent need to develop a completely biodegradable adhesive tape, which can meet the use requirements and is environmentally friendly.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
The invention aims to provide a preparation method of a PVA-based degradable adhesive tape, and the packaging material produced by the method belongs to a degradable product, is green and environment-friendly, has good water resistance and flexibility, avoids the step of removing the adhesive tape when a carton of the adhesive tape is recycled, and reduces the recycling cost of the carton.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for preparing a PVA-based degradable adhesive tape, comprising: stirring a mixture containing polyvinyl alcohol (PVA), starch, distilled water and a plasticizer at 100-120 ℃ for 20-30 min, adding a cross-linking agent and a stabilizing agent, and uniformly stirring to obtain a mixture; the weight parts of the components are as follows: 30-80 parts of PVA; 20-40 parts of starch; 5-10 parts of distilled water; 0.5-10 parts of a plasticizer; 0.1-1 part of a crosslinking agent; 0.1-1 part of a stabilizer;
extruding and blowing the mixture to obtain a semi-finished film; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s, so that a substrate layer is prepared;
coating a release layer material on one side of the base material layer to prepare a release layer; the release layer is prepared from a raw material containing silicone oil;
coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer; the adhesive layer is prepared from degradable adhesive.
Preferably, wherein the polyvinyl alcohol is selected from one or more of 1799-type resin, 2299-type resin or 2499-type resin; the starch is one or more of cassava starch, corn starch and potato starch; the plasticizer is one or more of glycerol, soybean oil and dioctyl phthalate; the cross-linking agent is one or more of dicumyl peroxide (DCP), Benzoyl Peroxide (BPO) and di-tert-butyl peroxide; the stabilizer is one or more of zinc stearate, calcium stearate and calcium zinc stearate.
Preferably, the preparation method of the adhesive layer material comprises the following steps: mixing gelatin with distilled water, and standing for 20-48 h to obtain a first glue solution; mixing PVA with distilled water, and standing for 20-48 h to prepare a second glue solution; stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to prepare an adhesive layer material;
the weight parts of the components are as follows: 2-10 parts of PVA; 2-10 parts of gelatin; 100-250 parts of distilled water.
The invention at least comprises the following beneficial effects: the invention provides a completely biodegradable adhesive tape, wherein a main body of a base material layer material is polyvinyl alcohol (PVA) and starch, and the interior of the PVA, the interior of the starch and active groups of the PVA, the starch and a cross-linking agent can be cross-linked to form a multidimensional network structure, so that a framework of the base material layer is formed. The adhesive of the adhesive layer and the PVA and starch of the base material layer have similar structural units, so that the adhesive layer can be partially absorbed into the base material layer after being coated with the adhesive layer, and the adhesive force between the adhesive layer and the base material layer is improved. The degradable adhesive tape provided by the invention has good water resistance and flexibility, can be degraded at a certain temperature, and avoids the step of removing the adhesive tape when the carton of the adhesive tape is recycled, thereby reducing the recycling cost of the carton.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
in the figure: the icon 1 is a release layer, the icon 2 is a base material layer, and the icon 3 is an adhesive layer.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof. The components used in the examples are in parts by weight.
Example 1
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of 1799 powdery polyvinyl alcohol (PVA), 30 parts of corn starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of dicumyl peroxide (DCP) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
5 parts of 1799 powdery polyvinyl alcohol resin is dissolved in 150 parts of distilled water at the temperature of 80-85 ℃, and after complete dissolution, the mixture is uniformly mixed and stands for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 2
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of 2299-grade powdery polyvinyl alcohol (PVA), 30 parts of tapioca starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of dicumyl peroxide (DCP) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2299 powdered polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 3
(1) Preparing a substrate layer
Stirring a mixture of 2499 parts of powdered polyvinyl alcohol (PVA), 30 parts of potato starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of dicumyl peroxide (DCP) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2499 powdery polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 4
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of 1799 powdery polyvinyl alcohol (PVA), 20 parts of tapioca starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of dicumyl peroxide (DCP) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
5 parts of 1799 powdery polyvinyl alcohol resin is dissolved in 150 parts of distilled water at the temperature of 80-85 ℃, and after complete dissolution, the mixture is uniformly mixed and stands for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 5
(1) Preparing a substrate layer
Stirring a mixture of 80 parts of 1799 powdery polyvinyl alcohol (PVA), 10 parts of tapioca starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of dicumyl peroxide (DCP) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
5 parts of 1799 powdery polyvinyl alcohol resin is dissolved in 150 parts of distilled water at the temperature of 80-85 ℃, and after complete dissolution, the mixture is uniformly mixed and stands for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 6
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of 2299-grade powdery polyvinyl alcohol (PVA), 20 parts of tapioca starch, 5 parts of distilled water and 4 parts of soybean oil at 100-120 ℃ for 20-30 min, adding 0.5 part of dicumyl peroxide (DCP) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2299 powdered polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 7
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of 2299-grade powdery polyvinyl alcohol (PVA), 20 parts of cassava starch, 5 parts of distilled water and 4 parts of dioctyl phthalate at 100-120 ℃ for 20-30 min, adding 0.5 part of dicumyl peroxide (DCP) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2299 powdered polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 8
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of 2499 powdered polyvinyl alcohol (PVA), 20 parts of tapioca starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of Benzoyl Peroxide (BPO) and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2499 powdery polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 9
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of 2499 powdered polyvinyl alcohol (PVA), 20 parts of tapioca starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of di-tert-butyl peroxide and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2499 powdery polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 10
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of 2499-grade powdery polyvinyl alcohol (PVA), 20 parts of tapioca starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of di-tert-butyl peroxide and 0.5 part of calcium stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2499 powdery polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 11
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of 2499-grade powdery polyvinyl alcohol (PVA), 20 parts of cassava starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of di-tert-butyl peroxide and 0.5 part of calcium zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 5 parts of gelatin in 150 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
And (3) dissolving 5 parts of 2499 powdery polyvinyl alcohol resin in 150 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
(3) Preparation of degradable adhesive tape
Coating silicone oil on one side of the substrate layer to prepare a release layer; and coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer, and drying to obtain the degradable adhesive tape.
Example 12
Stirring a mixture of 70 parts of 1799 powdery polyvinyl alcohol (PVA), 20 parts of tapioca starch, 5 parts of distilled water and 4 parts of glycerol at 100-120 ℃ for 20-30 min, adding 0.5 part of di-tert-butyl peroxide and 0.5 part of zinc stearate, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to prepare a substrate layer; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s.
(2) Preparation of adhesive layer
Dissolving 10 parts of gelatin in 200 parts of distilled water at 40-50 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a first glue solution.
Dissolving 10 parts of 1799 powdery polyvinyl alcohol resin in 200 parts of distilled water at the temperature of 80-85 ℃, mixing uniformly after complete dissolution, and standing for 24 hours to prepare a second glue solution.
And stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to obtain the adhesive layer material.
Comparative examples 1 and 2 are commercially available scotch tapes, respectively, and comparative examples 3 and 4 are commercially available kraft tapes, respectively.
The performance test method of the degradable adhesive tape related by the invention is as follows:
normal 180 ° peel strength: the test is carried out according to the national standard GB/T2792.
Initial adhesion: the test was carried out according to the test method specified in method A of International Standard GB/T4852-2002, with a bevel inclination of 30 °.
Permanent adhesion: the test is carried out according to the test method specified in the method A in the national standard GB/T4851-2014, the width of the adhesive tape is (24 +/-0.5) mm, the length of the adhesive surface of the adhesive tape on the steel plate of the test platform is (12 +/-0.5) mm, and the weight mass is (1000 +/-5) g.
Normal tensile strength: the test was carried out at 25 ℃ and room temperature according to the national standard GB/T30776-.
Biodegradability: the inorganic content (volatile solids content) was measured according to the provisions of the national standard GB/T9345.1 method A, at a measurement temperature of 650 ℃. The biological decomposition rate is tested according to the regulations of national standards GB/T19277.1, GB/T19277.2, GB/T19276.1 and GB/T19276.2. In arbitration, the biological decomposition rate was tested according to the national standard GB/T19277.1. The test results are shown in table 1.
TABLE 1 test results of adhesive tape properties
From the test results in table 1, it can be seen that the performance parameters of the degradable adhesive tape prepared by the present invention are similar to those of the commercially available adhesive tape, even some performance parameters are superior to those of the commercially available adhesive tape, the degradable adhesive tape of the present invention can be matched with the uses of the commercially available adhesive tape, and can replace the existing commercially available adhesive tape, and the degradable adhesive tape of the present invention can be biodegraded, thereby reducing the pollution and burden to the environment.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
As described above, according to the present invention, a completely biodegradable adhesive tape is provided, wherein the main material of the substrate layer is polyvinyl alcohol (PVA) and starch, and the PVA, the starch and the active groups of the PVA, starch and the cross-linking agent can be cross-linked to form a multi-dimensional network structure, thereby forming the framework of the substrate layer. The adhesive of the adhesive layer and the PVA and starch of the base material layer have similar structural units, so that the adhesive layer can be partially absorbed into the base material layer after being coated with the adhesive layer, and the adhesive force between the adhesive layer and the base material layer is improved. The degradable adhesive tape provided by the invention has good water resistance and flexibility, can be degraded at a certain temperature, and avoids the step of removing the adhesive tape when the carton of the adhesive tape is recycled, thereby reducing the recycling cost of the carton.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (3)
1. A preparation method of PVA-based degradable adhesive tape is characterized in that,
stirring a mixture containing polyvinyl alcohol (PVA), starch, distilled water and a plasticizer at 100-120 ℃ for 20-30 min, adding a cross-linking agent and a stabilizing agent, and uniformly stirring to obtain a mixture; the weight parts of the components are as follows: 30-80 parts of PVA; 20-40 parts of starch; 5-10 parts of distilled water; 0.5-10 parts of a plasticizer; 0.1-1 part of a crosslinking agent; 0.1-1 part of a stabilizer;
extruding and blowing the mixture to obtain a semi-finished film; stretching and drying the semi-finished film; the temperature of the first drying treatment step is 170-180 ℃, and the drying time is 5-10 s, so that a substrate layer is prepared;
coating a release layer material on one side of the base material layer to prepare a release layer; the release layer is prepared from a raw material containing silicone oil;
coating an adhesive layer material on the other side of the substrate layer to prepare an adhesive layer; the adhesive layer is prepared from degradable adhesive.
2. The method for preparing PVA-based degradable adhesive tape according to claim 1, wherein the polyvinyl alcohol is one or more selected from 1799 type resin, 2299 type resin or 2499 type resin; the starch is one or more of cassava starch, corn starch and potato starch; the plasticizer is one or more of glycerol, soybean oil and dioctyl phthalate; the cross-linking agent is one or more of dicumyl peroxide (DCP), Benzoyl Peroxide (BPO) and di-tert-butyl peroxide; the stabilizer is one or more of zinc stearate, calcium stearate and calcium zinc stearate.
3. The method for preparing PVA-based degradable adhesive tape according to claim 1, wherein the method for preparing the adhesive layer material comprises: mixing gelatin with distilled water, and standing for 20-48 h to obtain a first glue solution; mixing PVA with distilled water, and standing for 20-48 h to prepare a second glue solution; stirring and mixing the first glue solution and the second glue solution for 20-30 min, and adjusting the pH value to 6.5-7.5 to prepare an adhesive layer material;
the weight parts of the components are as follows: 2-10 parts of PVA; 2-10 parts of gelatin; 100-250 parts of distilled water.
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Inventor after: Li Xianggang Inventor after: Huang Yuqi Inventor after: Wang Zhaoxia Inventor after: Qi Liyi Inventor before: Li Xianggang Inventor before: Huang Yuqi Inventor before: Wang Zhaoxia |