CN110205044B - Preparation method of biodegradable box sealing adhesive tape and biodegradable box sealing adhesive tape - Google Patents
Preparation method of biodegradable box sealing adhesive tape and biodegradable box sealing adhesive tape Download PDFInfo
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- CN110205044B CN110205044B CN201910502221.1A CN201910502221A CN110205044B CN 110205044 B CN110205044 B CN 110205044B CN 201910502221 A CN201910502221 A CN 201910502221A CN 110205044 B CN110205044 B CN 110205044B
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- 239000012945 sealing adhesive Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 39
- 239000010410 layer Substances 0.000 claims abstract description 98
- 239000000758 substrate Substances 0.000 claims abstract description 50
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 20
- 230000001070 adhesive effect Effects 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 239000012790 adhesive layer Substances 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 229920006381 polylactic acid film Polymers 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 21
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 20
- 229920001245 poly(D,L-lactide-co-caprolactone) Polymers 0.000 claims description 18
- -1 polysiloxane Polymers 0.000 claims description 18
- 229920001296 polysiloxane Polymers 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 18
- 239000003999 initiator Substances 0.000 claims description 13
- 239000004014 plasticizer Substances 0.000 claims description 10
- 229920001187 thermosetting polymer Polymers 0.000 claims description 9
- 244000043261 Hevea brasiliensis Species 0.000 claims description 7
- 229920003052 natural elastomer Polymers 0.000 claims description 7
- 229920001194 natural rubber Polymers 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 4
- 125000003700 epoxy group Chemical group 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 25
- 239000004626 polylactic acid Substances 0.000 description 18
- 229920001610 polycaprolactone Polymers 0.000 description 16
- 238000003912 environmental pollution Methods 0.000 description 10
- 239000003292 glue Substances 0.000 description 8
- 238000009472 formulation Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 239000012855 volatile organic compound Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 3
- 229920002050 silicone resin Polymers 0.000 description 3
- 244000215068 Acacia senegal Species 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- 229920000084 Gum arabic Polymers 0.000 description 2
- 235000010489 acacia gum Nutrition 0.000 description 2
- 239000000205 acacia gum Substances 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- ZVFDTKUVRCTHQE-UHFFFAOYSA-N Diisodecyl phthalate Chemical compound CC(C)CCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC(C)C ZVFDTKUVRCTHQE-UHFFFAOYSA-N 0.000 description 1
- 240000007472 Leucaena leucocephala Species 0.000 description 1
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013773 glyceryl triacetate Nutrition 0.000 description 1
- 239000001087 glyceryl triacetate Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229960002622 triacetin Drugs 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
-
- 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
- C09J7/201—Adhesives in the form of films or foils characterised by their carriers characterised by the release coating composition on the carrier layer
-
- 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
- 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
- C09J2483/00—Presence of polysiloxane
- C09J2483/005—Presence of polysiloxane in the release coating
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesive Tapes (AREA)
- Biological Depolymerization Polymers (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a preparation method of a biodegradable box sealing adhesive tape and the biodegradable box sealing adhesive tape. The preparation method of the biodegradable sealing adhesive tape comprises the following steps: s1: taking a substrate layer, wherein the substrate layer is a modified PLA film; s2: transversely stretching the substrate layer in the step S1, coating a release agent on the upper surface of the substrate layer, and longitudinally stretching, wherein the release agent is cured at the temperature of longitudinal stretching to form a release layer, and the release layer and the substrate layer form a composite layer; s3: and coating an adhesive on the lower surface of the composite layer prepared in the step S2 to form an adhesive layer. The preparation method of the biodegradable sealing adhesive tape is simple in preparation process and can reduce the influence on the film performance.
Description
Technical Field
The invention relates to the technical field of carton sealing tapes, in particular to a preparation method of a biodegradable carton sealing tape and the biodegradable carton sealing tape.
Background
The sealing adhesive tape has wide market application, and can not be separated in various industries in daily production and life, and particularly the demand of the sealing adhesive tape is increased rapidly at the present day when the logistics industry is developed vigorously. The box sealing adhesive tape generally comprises a release layer, a substrate film and an adhesive layer which are sequentially stacked, wherein the release layer is arranged for ensuring that a roll of box sealing adhesive tape can be smoothly peeled layer by layer in use. In order to ensure that mutual adhesion is not generated during rolling, a release layer is compounded on one surface of the base material film in advance, and an adhesive layer is compounded on the other surface of the base material film. In the conventional preparation process, the substrate film is stretched bidirectionally at the temperature of 100-. The process is complicated and the unnecessary energy consumption is large. In addition, most of the sealing adhesive tapes in the market are made of non-degradable materials, so that the problem of serious environmental pollution exists. The glass transition temperature of the biodegradable material PLA is only 60 ℃, and if the film is subjected to hot processing after being stretched in two directions, the performance of the film can be seriously influenced.
Disclosure of Invention
Therefore, a preparation method of the biodegradable box sealing adhesive tape and the biodegradable box sealing adhesive tape are needed to be provided, wherein the preparation process is simple, and the influence on the performance of the film can be reduced.
A preparation method of a biodegradable box sealing adhesive tape comprises the following steps:
s1: taking a substrate layer, wherein the substrate layer is a modified PLA film;
s2: transversely stretching the substrate layer in the step S1, coating a release agent on the upper surface of the substrate layer, and longitudinally stretching, wherein the release agent is cured at the temperature of longitudinal stretching to form a release layer, and the release layer and the substrate layer form a composite layer;
s3: and coating an adhesive on the lower surface of the composite layer prepared in the step S2 to form an adhesive layer.
In one embodiment, the method for preparing the substrate layer in step S1 includes the following steps: and melting and plasticating the PLA particles, the PCL particles and the plasticizer to prepare the PLA/PCL composite film, namely the substrate layer.
In one embodiment, the preparation method of the release agent in the step S2 includes the following steps:
and (3) ultrasonically and uniformly mixing epoxy group or acrylate group terminated waterborne polysiloxane and a waterborne thermal initiator to prepare thermosetting waterborne polysiloxane, namely the release agent.
In one embodiment, the aqueous thermal initiator is used in an amount of 1 to 6 wt%.
In one embodiment, the mass ratio of the PLA particles to the PCL particles is 1:10-10: 1.
In one embodiment, the PLA particles, the PCL particles, and the plasticizer are melt plasticated at 70-200 ℃.
In one embodiment, the temperature of the longitudinal stretching in step S2 is 70 ℃ to 200 ℃.
In one embodiment, the adhesive comprises a degradable natural rubber adhesive.
In one embodiment, the thickness of the release layer is 14-28 μm; the thickness of the adhesive layer is 20-30 μm.
The biodegradable box sealing adhesive tape prepared by the preparation method is provided.
The preparation method of the biodegradable sealing adhesive tape is simple in process and can reduce the influence on the performance of the film. Compared with the traditional processing technology, the preparation method of the biodegradable sealing adhesive tape has the characteristics of simplicity, high efficiency and low energy consumption, and can reduce the influence on the performance of the film.
The substrate layer and the adhesive layer of the sealing tape prepared by the preparation method of the biodegradable sealing tape are made of biodegradable materials, such as modified PLA film of the substrate layer and thermosetting waterborne polysiloxane of a release agent, so that the preparation method of the sealing tape can meet the requirements of the preparation method of the sealing tape, reduce environmental pollution to a great extent and meet the requirement of environmental protection. The preparation method of the biodegradable box sealing adhesive tape disclosed by the invention has the advantages of no VOC (volatile organic compound) emission, greenness and environmental friendliness, and can reduce environmental pollution to a greater extent.
Drawings
FIG. 1 is a schematic side view of a biodegradable box sealing tape;
FIG. 2 is a flow chart of a preparation process of the biodegradable box sealing adhesive tape;
FIG. 3 is a flow chart of the biodegradable box sealing tape manufacturing apparatus used in example 1.
Description of the reference numerals
10. Biodegradable sealing adhesive tape; 100: a release layer; 200: a substrate layer; 300: an adhesive layer; 20: an extruder; 30: a die head; 40: a transverse drawing machine; 50: a first glue spreader; 51: a first glue inlet; 60: longitudinally drawing machine; 70: a second glue spreader; 71: a second glue inlet; 80: and (7) a winding machine.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a biodegradable box sealing tape 10, which includes a release layer 100, a substrate layer 200, and an adhesive layer 300, which are sequentially stacked. The substrate layer 200 is a PLA/PCL composite film.
The PLA/PCL composite film is prepared by melting, plasticating and biaxial stretching PLA particles, PCL particles and a plasticizer. The melt plastication temperature is 70-200 deg.C, such as 70 deg.C, 100 deg.C, 150 deg.C, 200 deg.C or other non-integer degree. The mass ratio of the PLA particles to the PCL particles is 1:10-10:1, for example, the mass ratio of the PLA particles to the PCL particles is 1:10, 5:10, 1:1, 5:1, 10:1 or other ratios, and the mass ratio of the PLA particles to the PCL particles is preferably 1: 1.
In a specific example, the release layer 100 is thermally cured from a release agent comprising an ultrasonically mixed homogeneous thermally cured aqueous polysiloxane resin and an aqueous thermal initiator.
In a specific example, the heat-curable aqueous polysiloxane resin is epoxy group or acrylate group terminated aqueous polysiloxane, and the amount of the aqueous thermal initiator is 1-6 wt% of the total mass of the heat-curable aqueous polysiloxane resin and the aqueous thermal initiator.
In a specific example, the release layer 100 is made by curing a release agent using a temperature at which the substrate layer 200 is biaxially stretched.
In a specific example, the substrate layer 200 is biaxially stretched, which includes transverse stretching and longitudinal stretching, and the release layer 100 is made of a release agent cured by using the temperature of the substrate layer 200 in the longitudinal stretching. The temperature of longitudinal stretching is 70-200 ℃, for example, the temperature of longitudinal stretching is 70 ℃, 100 ℃, 200 ℃ or other non-integral degrees, etc. The release layer 100 of the biodegradable box sealing adhesive tape 10 is prepared by thermally curing a release agent, wherein the release agent comprises uniformly mixed thermosetting waterborne polysiloxane resin and a waterborne thermal initiator, and the thermosetting waterborne polysiloxane can be initiated by the initiator to polymerize at 80-120 ℃ to quickly complete curing and crosslinking so as to form the release layer 100 with extremely low surface energy.
The adhesive layer 300 is formed by a degradable natural rubber adhesive coated on the surface of the substrate layer 200, such as aqueous natural latex, gum arabic adhesive, etc., and the adhesive layer 300 made of the degradable natural rubber adhesive is beneficial to eliminating environmental pollution to a greater extent. The adhesive layer 300 of the biodegradable box sealing tape 10 of the present invention is also made of a biodegradable material, and the adhesive layer 300 is formed by a degradable natural rubber adhesive coated on the surface of the base material layer 200, such as an aqueous natural latex, an acacia adhesive, and the like, which is beneficial to eliminating environmental pollution to a greater extent.
The thickness of the release layer 100 is 14 μm to 28 μm, for example, the thickness of the release layer 100 is 14 μm, 15 μm, 20 μm, 28 μm or other non-integer value, and the thickness of the release layer 100 is preferably 20 μm.
The biodegradable box sealing adhesive tape 10 can solve the problem that the existing biodegradable box sealing adhesive tape 10 pollutes the environment and can reduce production energy consumption. The base material layer 200 of the biodegradable box sealing adhesive tape 10 adopts a biodegradable material PLA/PCL composite film, and solves the problem that the biodegradable box sealing adhesive tape 10 in the prior art is difficult to degrade and causes environmental pollution, wherein polylactic acid (PLA) has good biodegradability and biocompatibility, but pure PLA has the defects of low thermal deformation temperature, hardness and brittleness, low impact strength and low tearing strength, and is difficult to process and use independently if not subjected to modification treatment. For this purpose, the present invention prepares a modified PLA film, preferably a PLA/PCL composite film, by adding a flexible component. The melting point of poly epsilon-caprolactone (PCL) is 61 ℃, the glass transition temperature is-60 ℃, the poly epsilon-caprolactone is rubbery at room temperature, the flexibility is excellent, the tensile strength is high, and the elongation at break is as high as 1000%. Therefore, the invention selects PCL and PLA to be mixed and modified to prepare the biodegradable film as the substrate layer 200 of the biodegradable box sealing adhesive tape 10.
The substrate layer 200 and the adhesive layer 300 of the biodegradable box sealing adhesive tape 10 are made of biodegradable materials, so that the environmental pollution can be reduced to a great extent, the environmental protection requirement is met, the whole film laminating process is free of VOC (volatile organic compound) emission, the environment is protected, and the environmental pollution can be reduced to a greater extent; the preparation process of the biodegradable box sealing adhesive tape 10 can be simplified, the release agent is coated during the process of forming the substrate layer 200 through biaxial stretching, the release agent is thermally cured by utilizing the heat generated during biaxial stretching to form the release layer 100, and the composite film combining the substrate layer 200 and the release layer 100 is prepared at the same time.
The embodiment also provides a biodegradable box sealing adhesive tape 10 prepared by the preparation method of the biodegradable box sealing adhesive tape. The preparation method of the biodegradable sealing adhesive tape comprises the following steps:
referring to fig. 2, S1: taking a substrate layer 200, wherein the substrate layer 200 is a modified PLA film. The method for preparing the base material layer 200 in step S1 includes the steps of: the PLA particles, the PCL particles and the plasticizer are melted and plasticated to prepare the PLA/PCL composite film, namely the substrate layer 200. The mass ratio of the PLA particles to the PCL particles is 1:10-10: 1. The PLA granules, the PCL granules and the plasticizer are melted and plasticated at 70-200 ℃.
S2: transversely stretching the substrate layer 200 in the step S1, coating a release agent on the upper surface of the substrate layer, longitudinally stretching, curing the release agent at the longitudinally stretching temperature to form a release layer 100, and forming a composite layer by the release layer 100 and the substrate layer 200; the temperature of longitudinal stretching is 70-200 ℃. The preparation method of the release agent in the step S2 comprises the following steps: and (3) ultrasonically and uniformly mixing epoxy group or acrylate group terminated waterborne polysiloxane and a waterborne thermal initiator to prepare thermosetting waterborne polysiloxane, namely a release agent. The amount of the aqueous thermal initiator is 1-6 wt%. S3: the adhesive is applied to the lower surface of the composite layer prepared in step S2 to form the adhesive layer 300. The adhesive comprises degradable natural rubber adhesive, such as water-based natural latex, gum arabic adhesive, etc.
S4: and (6) rolling.
In one embodiment, the release layer 100 has a thickness of 14 μm to 28 μm; the adhesive layer 300 has a thickness of 20 to 30 μm.
Example 1
Referring to fig. 3, the present embodiment performs the preparation of the biodegradable box sealing tape 10 by using the biodegradable box sealing tape 10 preparation apparatus. The preparation equipment of the biodegradable box sealing adhesive tape 10 comprises an extruder 20, a die head 30, a transverse drawing machine 40, a first adhesive coating machine 50, a longitudinal drawing machine 60, a second adhesive coating machine 70 and a winding machine 80 which are sequentially arranged. The method specifically comprises the following steps:
(1) preparing a release agent
According to the formula in the table 1, a certain mass of water-based heat-cured polysiloxane and a certain mass of heat initiator are taken and uniformly mixed by ultrasonic to prepare heat-cured polysiloxane resin, namely a release agent. Wherein the potassium persulfate and the ammonium persulfate are free radical thermal initiators. The thermal cure silicone resin performance test data for each formulation is shown in table 2.
TABLE 1 formulation of heat-curable silicone resins
TABLE 2 Properties of the thermally curable Silicone resins of different formulations
(1) Preparation of PLA/PCL sheet Material
And (2) putting PLA particles, PCL particles and a plasticizer in a certain mass ratio into an extruder 20 according to a formula shown in the table 3, melting and plasticating at 150 ℃, extruding into a tabletting mold after a period of time, demolding and cooling to obtain the PLA/PCL flaky material. Wherein octyl phthalate, diisodecyl phthalate and triacetin are used as plasticizers. The performance test data of PLA/PCL sheet materials with different formulations are shown in Table 4.
TABLE 3 formulation for preparing PLA/PCL sheet materials
Note: the formula with x is the control group.
TABLE 4 Property parameters of PLA/PCL sheets of different formulations
In the control SAM-20-1, too much PLA component was used, resulting in too high a temperature suitable for biaxial stretching of the sheet material; in the control group SAM-1-20, too little PLA component is used, which results in too low temperature suitable for biaxial stretching of the sheet material, so that too high or too low temperature is difficult to match with the curing temperature of the thermosetting polysiloxane resin, and the preparation method of the sealing adhesive tape is not favorable for preparing the sealing adhesive tape.
(3) Preparation of biodegradable sealing tape 10
As shown in the figures 2-3 of the drawings,
according to the formula of SAM-1-1, namely 500g of PLA granules and 100g of PCL granules respectively, and 100g of plasticizer dioctyl phthalate, raw materials are taken and put into an extruder 20 to be melted and plasticated at 150 ℃, extruded by a die head 30 after a period of time to prepare a PLA/PCL sheet material, the cooled PLA/PCL sheet material is preheated by a transverse drawing machine 40, and transversely drawn at 100 ℃ and 1 mm/min;
adding PA-2 thermosetting polysiloxane acrylic resin into a first glue inlet 51 of a first glue spreader 50, transversely stretching a PLA/PCL sheet material, rolling a release agent with the thickness of 20um on the upper surface of the PLA/PCL sheet material, feeding the PLA/PCL sheet material into a longitudinal stretching machine 60, and longitudinally stretching the PLA/PCL sheet material at the temperature of 100 ℃ and the speed of 1mm/min to obtain a substrate layer 200, wherein the release agent is cured to form a release layer 100, and the substrate layer 200 and the release layer 100 form a composite layer;
adding a degradable natural rubber adhesive into a second glue inlet 71 of a second glue spreader 70, rolling 25um of the rubber adhesive on the lower surface of the composite layer, curing to form an adhesion layer, forming a biodegradable box sealing adhesive tape 10 from the release layer 100, the base material layer 200 and the adhesion layer, and finally rolling the biodegradable box sealing adhesive tape 10 by a rolling machine 80 as shown in fig. 1.
The preparation method of the biodegradable sealing adhesive tape is simple in process and can reduce the influence on the performance of the film. Compared with the traditional processing technology, the preparation method of the biodegradable sealing adhesive tape has the characteristics of simplicity, high efficiency and low energy consumption, and can reduce the influence on the performance of a film.
The substrate layer 200 and the adhesive layer 300 of the biodegradable box sealing adhesive tape 10 prepared by the preparation method of the biodegradable box sealing adhesive tape provided by the invention are made of biodegradable materials, such as modified PLA films of the substrate layer 200 and thermosetting waterborne polysiloxane of a release agent, so that the preparation method of the biodegradable box sealing adhesive tape can meet the requirements of the preparation method of the biodegradable box sealing adhesive tape, reduce environmental pollution to a great extent and meet the requirements of environmental protection. The preparation method of the biodegradable box sealing adhesive tape disclosed by the invention has the advantages of no VOC (volatile organic compound) emission, greenness and environmental friendliness, and can reduce environmental pollution to a greater extent.
According to the invention, the traditional preparation process of the biodegradable box sealing adhesive tape 10 is abandoned, the release layer 100 is prepared by curing a release agent at the temperature of the bidirectional stretching of the substrate layer 200, the release layer 100 is formed by curing the upper surface of the substrate layer 200 at the temperature of the bidirectional stretching of the substrate layer 200 in the process of the bidirectional stretching of the substrate layer 200, and the composite film comprising the substrate layer 200 and the release layer 100 is obtained after the bidirectional stretching of the substrate layer 200 is completed, so that the traditional process is simplified, and the processing production efficiency and the energy utilization rate are greatly improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of a biodegradable box sealing adhesive tape is characterized by comprising the following steps:
s1: taking a substrate layer, wherein the substrate layer is a modified PLA film; the preparation method of the substrate layer comprises the following steps: melting and plasticating the PLA particles, the PCL particles and the plasticizer to prepare a PLA/PCL composite film, namely a substrate layer;
s2: transversely stretching the substrate layer in the step S1, coating a release agent on the upper surface of the substrate layer, and longitudinally stretching, wherein the release agent is cured at the temperature of longitudinal stretching to form a release layer, and the release layer and the substrate layer form a composite layer;
s3: and coating an adhesive on the lower surface of the composite layer prepared in the step S2 to form an adhesive layer.
2. The method for preparing biodegradable box sealing adhesive tape according to claim 1, wherein the method for preparing the release agent in step S2 comprises the following steps:
and (3) ultrasonically and uniformly mixing epoxy group or acrylate group terminated waterborne polysiloxane and a waterborne thermal initiator to prepare thermosetting waterborne polysiloxane, namely the release agent.
3. The method of claim 2, wherein the aqueous thermal initiator is used in an amount of 1-6 wt%.
4. The method for preparing biodegradable box sealing adhesive tape according to any one of claims 1-3, wherein the mass ratio of the PLA particles to the PCL particles is 1:10-10: 1.
5. The method for preparing biodegradable box sealing adhesive tape according to claim 4, wherein the PLA particles, the PCL particles and the plasticizer are melt-plasticated at 70-200 ℃.
6. The method of preparing biodegradable box sealing tape according to any one of claims 1-3, wherein the temperature of the longitudinal stretching in step S2 is 70-200 ℃.
7. The method of preparing biodegradable box sealing tape according to any one of claims 1-3, wherein the adhesive comprises a degradable natural rubber adhesive.
8. The method for preparing biodegradable box sealing tape according to any one of claims 1-3, wherein the thickness of the release layer is 14 μm-28 μm.
9. The method of claim 8, wherein the adhesive layer has a thickness of 20 μm to 30 μm.
10. A biodegradable box sealing tape prepared by the method of any one of claims 1-9.
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| CN112940640A (en) * | 2020-12-30 | 2021-06-11 | 南京盛凯新材料有限公司 | Matte release film produced by EB (Electron Beam) curing |
| CN114479688A (en) * | 2022-03-18 | 2022-05-13 | 上海晶华胶粘新材料股份有限公司 | Degradable adhesive tape |
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| DE202006001693U1 (en) * | 2006-02-01 | 2006-03-30 | Logo tape Gesellschaft für Selbstklebebänder GmbH Co. KG | Biodegradable adhesive tape based on renewable raw materials |
| CN101104779A (en) * | 2007-07-19 | 2008-01-16 | 中国科学院长春应用化学研究所 | A fully biodegradable polylactic acid pressure-sensitive adhesive tape and its preparation method |
| CN103969718A (en) * | 2014-05-10 | 2014-08-06 | 宁波东旭成新材料科技有限公司 | Diffusion film preparing method |
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|---|---|---|---|---|
| DE202006001693U1 (en) * | 2006-02-01 | 2006-03-30 | Logo tape Gesellschaft für Selbstklebebänder GmbH Co. KG | Biodegradable adhesive tape based on renewable raw materials |
| CN101104779A (en) * | 2007-07-19 | 2008-01-16 | 中国科学院长春应用化学研究所 | A fully biodegradable polylactic acid pressure-sensitive adhesive tape and its preparation method |
| CN103969718A (en) * | 2014-05-10 | 2014-08-06 | 宁波东旭成新材料科技有限公司 | Diffusion film preparing method |
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Effective date of registration: 20211220 Address after: 510289 room 101A, first floor, building 10, No. 5 Industrial Zone, South China West Enterprise Group, No. 38 daganwei, Haizhu District, Guangzhou City, Guangdong Province Patentee after: GUANGZHOU BAOLI BANGDE HIGH POLYMER MATERIAL Co.,Ltd. Address before: Room 405, building 401, No.13, South China West No.5 Industrial Zone, 38 daganwei, Haizhu District, Guangzhou, Guangdong 510300 Patentee before: Guangzhou Mofu Material Technology Co.,Ltd. |