CN113980598A - Preparation method of PLA-based degradable adhesive tape - Google Patents

Preparation method of PLA-based degradable adhesive tape Download PDF

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Publication number
CN113980598A
CN113980598A CN202111373921.9A CN202111373921A CN113980598A CN 113980598 A CN113980598 A CN 113980598A CN 202111373921 A CN202111373921 A CN 202111373921A CN 113980598 A CN113980598 A CN 113980598A
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parts
prepare
pla
adhesive tape
mixture
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李祥刚
黄煜琪
王召霞
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Zhejiang Great Shengda Packing Co Ltd
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Zhejiang Great Shengda Packing Co Ltd
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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
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/255—Polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2401/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • 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
    • 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
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester 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
    • C09J2489/00—Presence of protein

Abstract

The invention discloses a preparation method of a PLA-based degradable adhesive tape, which comprises the steps of stirring a mixture containing polylactic acid (PLA), adipic acid-butylene terephthalate copolymer (PBAT), starch and a plasticizer at 120-150 ℃ for 20-30 min, adding a cross-linking agent and a stabilizing agent, and uniformly stirring to obtain a mixture; extruding and blowing the mixture to obtain a semi-finished film; stretching and drying the semi-finished film; 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 the adhesive layer. The packaging material produced by the invention 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

Preparation method of PLA-based degradable adhesive tape
Technical Field
The invention belongs to the technical field of preparation of degradable packaging materials, and particularly relates to a preparation method of a PLA-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. The green degradable material is a material which can be completely decomposed by environmental microorganisms after being discarded and finally becomes an inorganic component of carbon circulation in nature. The green degradable material has the advantages of wide source, low price, biodegradability, easy recovery and the like, and can save resources and energy sources in the recycling treatment process. Among them, polylactic acid (PLA) is a desirable material to meet these requirements.
Polylactic acid is also called polylactide (polylactide), and is a polymer obtained by polymerizing lactic acid as a main raw material, and the raw materials of the polylactic acid are widely available and can be regenerated. Although the mechanical properties of PLA are excellent, PLA has the disadvantages of poor toughness, poor heat resistance, etc., so that it cannot be compared with conventional polymer materials in practical use, thereby greatly limiting its application in many fields. Therefore, it is necessary to modify PLA. The adipic acid-butylene terephthalate copolymer (PBAT) belongs to a thermoplastic biodegradable material, has the characteristics of both the adipic acid butylene terephthalate (PBA) and the butylene terephthalate (PBT), and has good ductility and elongation at break as well as good heat resistance and impact performance; in addition, it has excellent biodegradability. Therefore, PBAT can be used as a material for improving the toughness of PLA.
At present, the development of PLA-based degradable adhesive tapes is less in China, and the waterproof performance of the existing PLA degradable adhesive tapes is poorer. In view of the above problems, there is an urgent need to develop a completely biodegradable PLA tape that can meet the use requirements and has good water resistance and flexibility.
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 PLA-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 of the present invention, there is provided a method for preparing a PLA-based degradable adhesive tape, comprising:
stirring a mixture containing polylactic acid (PLA), a polybutylene adipate-terephthalate copolymer (PBAT), starch and a plasticizer at 120-150 ℃ 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 PLA; 0-20 parts of PBAT; 0-20 parts of starch; 0-10 parts of nano cellulose; 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 starch is one or more of tapioca 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 PLA-based degradable adhesive tape prepared by the invention can be completely biodegraded, and waste generated after the waste can be degraded into water and carbon dioxide in a natural environment, so that the PLA-based degradable adhesive tape has no pollution to the environment. In addition, the PLA-based degradable adhesive tape is provided with a waterproof layer, so that the application range of the PLA-based degradable adhesive tape is expanded, and the storage time and the service life of the PLA-based degradable adhesive tape are prolonged. The degradable adhesive tape provided by the invention has good water resistance and flexibility, and has good service performance.
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 50 parts of polylactic acid (PLA), 20 parts of PBAT, 20 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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 polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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 3
(1) Preparing a substrate layer
Stirring a mixture of 70 parts of polylactic acid (PLA), 10 parts of PBAT, 10 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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 4
(1) Preparing a substrate layer
Stirring a mixture of 50 parts of polylactic acid (PLA), 20 parts of PBAT, 20 parts of corn starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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 50 parts of polylactic acid (PLA), 20 parts of PBAT, 20 parts of potato starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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 60 parts of polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of soybean oil at 120-150 ℃ 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 7
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of dioctyl phthalate at 120-150 ℃ 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 8
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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.
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 9
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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.
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 10
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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.
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 11
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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.
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 12
(1) Preparing a substrate layer
Stirring a mixture of 60 parts of polylactic acid (PLA), 15 parts of PBAT, 15 parts of tapioca starch, 5 parts of nano-cellulose and 4 parts of glycerol at 120-150 ℃ 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.
(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.
TABLE 1 test results of adhesive tape properties
Figure BDA0003363174180000101
Figure BDA0003363174180000111
Figure BDA0003363174180000121
Figure BDA0003363174180000131
Comparative examples 1 and 2 are commercially available scotch tapes, respectively, and comparative examples 3 and 4 are commercially available kraft tapes, respectively. 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, the PLA-based degradable adhesive tape prepared by the invention can be completely biodegraded, and waste generated after being discarded can be degraded into water and carbon dioxide in a natural environment, so that the PLA-based degradable adhesive tape has no pollution to the environment. In addition, the PLA-based degradable adhesive tape is provided with a waterproof layer, so that the application range of the PLA-based degradable adhesive tape is expanded, and the storage time and the service life of the PLA-based degradable adhesive tape are prolonged. The degradable adhesive tape provided by the invention has good water resistance and flexibility, and has good service performance.
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 PLA-based degradable adhesive tape is characterized in that,
stirring a mixture containing polylactic acid (PLA), a polybutylene adipate-terephthalate copolymer (PBAT), starch and a plasticizer at 120-150 ℃ 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 PLA; 0-20 parts of PBAT; 0-20 parts of starch; 0-10 parts of nano cellulose; 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 PLA-based degradable adhesive tape as claimed in claim 1, wherein the starch is one or more of tapioca 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 PLA-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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