CN111234726A - Pressure-sensitive adhesive tape capable of being repeatedly pasted and preparation method thereof - Google Patents
Pressure-sensitive adhesive tape capable of being repeatedly pasted and preparation method thereof Download PDFInfo
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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
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/20—Aqueous medium with the aid of macromolecular dispersing agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- 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
- C09J133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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- 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
- C09J7/26—Porous or cellular plastics
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- 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
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/046—Presence of homo or copolymers of ethene 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
- C09J2433/00—Presence of (meth)acrylic polymer
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Abstract
The invention discloses a pressure-sensitive adhesive tape capable of being repeatedly pasted, which comprises a base material and a microspheric pressure-sensitive adhesive coating arranged on the surface of the base material; the microspheric pressure-sensitive adhesive coating comprises the following raw materials in percentage by mass: 75-85% of isooctyl acrylate; 2-6% of methyl methacrylate; 1-3% of acrylic acid; 2-6% hydroxyethyl acrylate; 1-3% of acetoacetoxyethyl methacrylate; 1-1.5% of a nonionic surfactant; 2-7% of an anionic surfactant; 0.5-1% of a polymeric dispersant and 0.3-1% of an initiator. The invention also discloses a preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted. The pressure-sensitive adhesive tape which can be repeatedly pasted and peeled can still keep good bonding performance without obvious reduction of peeling strength after repeated pasting and peeling; through tests, the initial peel strength of the pressure-sensitive adhesive tape capable of being repeatedly pasted can reach 1.31N/25mm, and the minimum value of the peel strength after 100 pasting and peeling is 1.15N/25 mm.
Description
Technical Field
The invention belongs to the technical field of pressure-sensitive adhesives, and particularly relates to a pressure-sensitive adhesive tape capable of being repeatedly pasted and a preparation method thereof.
Background
Acrylate pressure sensitive adhesives are the most important class of resin-type pressure sensitive adhesives, which are acrylate copolymers obtained by copolymerizing various acrylate monomers. They have many advantages: the appearance is colorless and transparent and has good weather resistance; generally, good pressure-sensitive adhesive properties can be obtained without using additives such as tackifying resins, softeners and anti-aging agents.
The adhesive tape prepared by the acrylate pressure-sensitive adhesive is a pressure-sensitive adhesive tape. Chinese patent No. ZL201910640915.1 discloses a pressure-sensitive adhesive tape, a method for preparing the same, and a resin composition for preparing the pressure-sensitive adhesive tape. The resin composition comprises the following raw materials in parts by mass: 90-98% of polyacrylic resin; 0-6% of a photopolymerizable monomer; 0-2% of a photoinitiator; 0.01-2% of curing agent, forming a plurality of resin compositions with different properties by controlling the addition amount of different types of monomers in the resin compositions, and then forming the pressure-sensitive adhesive tape with high peeling force and low dielectric constant by combining the resin compositions with different properties. Such pressure-sensitive adhesive tapes lose their tackiness after being applied and peeled off several times.
Disclosure of Invention
The invention aims to provide a pressure-sensitive adhesive tape capable of being repeatedly pasted and a preparation method thereof, and aims to solve the technical problem that the pressure-sensitive adhesive tape in the prior art loses viscosity after being pasted and peeled for multiple times.
In order to achieve the purpose, the invention provides a pressure-sensitive adhesive tape capable of being repeatedly pasted, which comprises a base material and a microspheric pressure-sensitive adhesive coating arranged on the surface of the base material; the microspheric pressure-sensitive adhesive coating comprises the following raw materials in percentage by mass:
75-85% of isooctyl acrylate;
2-6% of methyl methacrylate;
1-3% of acrylic acid;
2-6% hydroxyethyl acrylate;
1-3% of acetoacetoxyethyl methacrylate;
1-1.5% of a nonionic surfactant;
2-7% of an anionic surfactant;
0.5-1% of a polymeric dispersant; and
0.3-1% of an initiator.
Preferably, the microspheric pressure-sensitive adhesive coating further comprises the following raw materials in percentage by mass: 1 to 3 percent of thickening agent, 0.3 to 0.8 percent of plasticizer, 0.1 to 0.5 percent of glycidyl methacrylate and 0.1 to 0.5 percent of mildew preventive.
Preferably, the initiator comprises the following raw materials: benzoyl peroxide and 2, 2-azobisisobutyronitrile, wherein the mass ratio of the two is 1: 0.8 to 1.2.
Preferably, the polymeric dispersant is PVA 1788; the nonionic surfactant is a nonionic surfactant A-980; the anionic surfactant is an anionic surfactant A-6820.
Preferably, the base material is a polyethylene foam base material, and the density of the base material is 60-110 kg/m3。
The invention also provides a preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted, which comprises the following steps:
1) preparation of dispersed phase: weighing isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, acetoacetoxyethyl methacrylate, glycidyl methacrylate and an initiator according to the proportion, and stirring and mixing uniformly to prepare the dispersed phase;
2) preparation of continuous phase: weighing the nonionic surfactant, the anionic surfactant and the polymer dispersant according to the proportion, adding deionized water, and controlling the oil-water ratio to be 1: 1.5-3, stirring and mixing uniformly to prepare a continuous phase;
3) preparing an emulsion: adding the dispersed phase into a storage tank of an SPG membrane emulsification device, and extruding the dispersed phase to the continuous phase through a through hole on the SPG membrane under the pressure action of nitrogen to form the emulsion, wherein the pressurization value is 0.02-0.08 Mpa; stirring to keep the emulsion stable; the stirring speed is 200-400 rpm;
4) polymerization: pouring the emulsion into a reaction container, heating to 38-48 ℃, starting stirring, introducing nitrogen for 30-90 minutes, and displacing dissolved oxygen at the stirring speed of 300-500 rpm; heating to 80-90 ℃, wherein the heating rate is 2-5 ℃/min, and reacting for 3-9 hours; after the reaction is finished, cooling to below 40 ℃, discharging, and filtering to obtain a pressure-sensitive adhesive microsphere suspension;
5) preparing glue: and washing and filtering the pressure-sensitive adhesive microsphere suspension, taking a paste enrichment phase, adding a thickening agent, a plasticizer and a mildew preventive in a proportioning amount into the paste enrichment phase, and uniformly stirring to obtain the microspheric pressure-sensitive adhesive.
6) Gluing: uniformly coating the microspheric pressure-sensitive adhesive on the surface of the substrate by using a wire bar coater with a gap of 20-100 microns; and then placing the obtained product in an environment with the temperature of 50-70 ℃ for pre-drying for 3-5 minutes, and then placing the obtained product in an environment with the temperature of 80-100 ℃ for drying for 2-8 minutes to form the microspheric pressure-sensitive adhesive coating and prepare the pressure-sensitive adhesive tape capable of being repeatedly pasted.
Preferably, the method for preparing the pressure-sensitive adhesive tape capable of being repeatedly pasted further comprises the following steps:
7) pretreatment of monomers: weighing isooctyl acrylate with a proportioning amount, and washing the isooctyl acrylate with 1.8-2.2 mol/L NaOH solution for 2-8 times; then repeatedly washing the mixture with distilled water to be neutral, and removing NaOH; and adding a drying agent, drying for 8-24 hours, and filtering to remove the drying agent.
Preferably, the method for preparing the pressure-sensitive adhesive tape capable of being repeatedly pasted further comprises the following steps:
8) heat treatment of the substrate: preparing a polyethylene foam plastic base material, putting the polyethylene foam plastic base material into a hot air oven, heating to 87-107 ℃, and carrying out heat treatment for 8-12 minutes; cooling to room temperature at a cooling rate of 1-3 deg.C/min.
Preferably, the aperture of the through hole of the SPG membrane is 5-13 microns.
Preferably, during the reaction of step 4), nitrogen is introduced into the emulsion.
The pressure-sensitive adhesive tape capable of being repeatedly pasted and the preparation method thereof provided by the embodiment of the invention have at least one of the following technical effects:
1. the pressure-sensitive adhesive tape which can be repeatedly pasted and peeled can still keep good bonding performance without obvious reduction of peeling strength after repeated pasting and peeling; through tests, the initial peel strength of the pressure-sensitive adhesive tape capable of being repeatedly pasted is 1.31N/25mm, and the peel strength after being repeatedly pasted for 100 times is 1.25N/25 mm;
2. the repeatedly-adhesive pressure-sensitive adhesive tape has no obvious increase in peel strength after long-time adhesion or heavy pressing, can be easily separated from an adherend and does not cause adhesive transfer; through tests, the peel strength of the pressure-sensitive adhesive tape which can be repeatedly pasted after being pressed for 7 days by 2kg is 1.42N/25 mm;
3. according to the preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted, the emulsion is prepared through the SPG film emulsifying device, the prepared emulsion is uniform in liquid drop and size, the microsphere pressure-sensitive adhesive coating formed by reaction is smooth in surface, and the adhesive performance is good.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a pressure-sensitive adhesive tape capable of being repeatedly stuck according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.
The pressure-sensitive adhesive tape capable of being repeatedly pasted provided by the embodiment of the invention comprises a base material 100 and a microspheric pressure-sensitive adhesive coating 200 arranged on the surface of the base material 100; the microspheric pressure-sensitive adhesive coating 200 comprises the following raw materials in percentage by mass: 75-85% of isooctyl acrylate; 2-6% of methyl methacrylate; 1-3% of acrylic acid; 2-6% hydroxyethyl acrylate; 1-3% of acetoacetoxyethyl methacrylate; 1-1.5% of a nonionic surfactant; 2-7% of an anionic surfactant; 0.5-1% of a polymeric dispersant and 0.3-1% of an initiator. The microsphere pressure-sensitive adhesive coating 200 prepared by using isooctyl acrylate (2-EHA) as a soft monomer, Methyl Methacrylate (MMA) as a hard monomer and Acrylic Acid (AA) and hydroxyethyl acrylate (2-HEA) as functional monomers has good adhesive property. The microsphere pressure-sensitive adhesive coating 200 obtained by adopting acetoacetoxyethyl methacrylate (AAEM) as a crosslinking monomer has low water absorption rate, low water loss rate, high crosslinking degree and good bonding property.
Preferably, the microsphere-type pressure-sensitive adhesive coating 200 further comprises the following raw materials in percentage by mass: 1 to 3 percent of thickening agent, 0.3 to 0.8 percent of plasticizer, 0.1 to 0.5 percent of glycidyl methacrylate and 0.1 to 0.5 percent of mildew preventive.
Preferably, the initiator comprises the following raw materials: benzoyl peroxide and 2, 2-azobisisobutyronitrile, wherein the mass ratio of the two is 1: 0.8 to 1.2, more preferably 1: 1. the mass ratio of the benzoyl peroxide to the 2, 2-azobisisobutyronitrile is 1: when the amount is 0.8 to 1.2, the conversion rate of the polymerization monomer is high and the polymerization coagulation rate is low.
Preferably, the polymeric dispersant is PVA 1788; the nonionic surfactant is a nonionic surfactant A-980; the anionic surfactant is an anionic surfactant A-6820.
Preferably, the base material 100 is a polyethylene foam base material 100, and the density thereof is 60 to 110kg/m3。
The embodiment of the invention also provides a preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted, which comprises the following steps:
1) preparation of dispersed phase: weighing isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, acetoacetoxyethyl methacrylate, glycidyl methacrylate and an initiator according to the proportion, and stirring and mixing uniformly to prepare the dispersed phase;
2) preparation of continuous phase: weighing the nonionic surfactant, the anionic surfactant and the polymer dispersant according to the proportion, adding deionized water, and controlling the oil-water ratio to be 1: 1.5-3, stirring and mixing uniformly to prepare a continuous phase;
3) preparing an emulsion: adding the dispersed phase into a storage tank of an SPG membrane emulsification device, and extruding the dispersed phase to the continuous phase through a through hole on the SPG membrane under the pressure action of nitrogen to form the emulsion, wherein the pressurization value is 0.02-0.08 Mpa; stirring to keep the emulsion stable; the stirring speed is 200-400 rpm;
the aperture of the through hole of the SPG film is 5-13 microns, the grain size range of colloidal particles extruded by the SPG film is 30-80 microns, and a glue layer prepared from the colloidal particles has good peeling strength and re-peeling property and does not have the phenomenon of colloidal particle transfer;
4) polymerization: pouring the emulsion into a reaction container, heating to 38-48 ℃, starting stirring, introducing nitrogen for 30-90 minutes, and displacing dissolved oxygen at the stirring speed of 300-500 rpm; heating to 80-90 ℃, wherein the heating rate is 2-5 ℃/min, reacting for 3-9 hours, and introducing nitrogen into the emulsion in the reaction process; after the reaction is finished, cooling to below 40 ℃, discharging, and filtering to obtain a pressure-sensitive adhesive microsphere suspension;
5) preparing glue: and washing and filtering the pressure-sensitive adhesive microsphere suspension, taking a paste enrichment phase, adding a thickening agent, a plasticizer and a mildew preventive in a proportioning amount into the paste enrichment phase, and uniformly stirring to obtain the microspheric pressure-sensitive adhesive.
6) Gluing: uniformly coating the microspheric pressure-sensitive adhesive on the surface of the substrate 100 by using a wire bar coater with a gap of 20-100 microns; and then placing the obtained product in an environment with the temperature of 50-70 ℃ for pre-drying for 3-5 minutes, and then placing the obtained product in an environment with the temperature of 80-100 ℃ for drying for 2-8 minutes to form the microspheric pressure-sensitive adhesive coating 200 and prepare the pressure-sensitive adhesive tape capable of being repeatedly pasted.
According to the preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted, the emulsion is prepared through the SPG film emulsifying device, the prepared emulsion is uniform in liquid drop and size, the microsphere pressure-sensitive adhesive coating 200 formed through reaction is smooth in surface and has good adhesive property.
Preferably, the method for preparing the pressure-sensitive adhesive tape capable of being repeatedly pasted further comprises the following steps:
7) pretreatment of monomers: weighing isooctyl acrylate with a proportioning amount, and washing the isooctyl acrylate with 1.8-2.2 mol/L NaOH solution for 2-8 times; then repeatedly washing the mixture with distilled water to be neutral, and removing NaOH; and adding a drying agent, drying for 8-24 hours, and filtering to remove the drying agent. Since isooctyl acrylate is easy to self-polymerize, a small amount of polymerization inhibitor is added into commercially available isooctyl acrylate during storage, and the polymerization inhibitor can affect the polymerization reaction. The purpose of step 7) is to remove the polymerization inhibitor from the acrylic acid.
Preferably, the method for preparing the pressure-sensitive adhesive tape capable of being repeatedly pasted further comprises the following steps:
8) heat treatment of the substrate 100: preparing a polyethylene foam plastic base material 100, putting the polyethylene foam plastic base material 100 into a hot air oven, heating to 87-107 ℃, and carrying out heat treatment for 8-12 minutes; cooling to room temperature at a cooling rate of 1-3 deg.C/min.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In the following examples, the starting materials used were commercially available products. Wherein the polymer dispersant is PVA 1788; the nonionic surfactant is a nonionic surfactant A-980; the anionic surfactant is an anionic surfactant A-6820; the thickener is thickener PTF; the drying agent is anhydrous calcium chloride.
Example 1
The pressure-sensitive adhesive tape capable of being repeatedly pasted provided by the embodiment comprises a base material 100 and a microspheric pressure-sensitive adhesive coating 200 arranged on the surface of the base material 100. The microspheric pressure-sensitive adhesive coating 200 comprises the following raw materials in percentage by mass: 75kg of isooctyl acrylate; 6kg of methyl methacrylate; 2kg of acrylic acid; 6kg of hydroxyethyl acrylate; 3kg of acetoacetoxyethyl methacrylate; 1.5kg of a non-ionic surfactant; 4.5kg of an anionic surfactant; 1kg of a polymeric dispersant; 1kg of initiator.
The initiator comprises the following raw materials: benzoyl peroxide and 2, 2-azobisisobutyronitrile, wherein the mass ratio of the two is 1: 0.8. the substrate 100 is a polyethylene foam substrate 100 having a density of 60kg/m3。
The embodiment of the invention also provides a preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted, which comprises the following steps:
1) pretreatment of monomers: weighing isooctyl acrylate with a proportioning amount, and washing for 5 times by using 20 liters of NaOH solution with the concentration of 1.8 mol/L; then repeatedly washing the mixture with distilled water to be neutral, and removing NaOH; drying for 8 hr, and filtering to remove the drying agent.
2) Heat treatment of the substrate 100: preparing a polyethylene foam plastic base material 100, putting the polyethylene foam plastic base material 100 into a hot air oven, heating to 87 ℃, and carrying out heat treatment for 12 minutes; cooling to room temperature at a cooling rate of 1 deg.C/min.
3) Preparation of dispersed phase: and weighing isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, acetoacetoxyethyl methacrylate, glycidyl methacrylate and an initiator according to the proportion, and stirring and mixing uniformly to obtain the dispersed phase.
4) Preparation of continuous phase: weighing the nonionic surfactant, the anionic surfactant and the polymer dispersant according to the proportion, adding deionized water, and controlling the oil-water ratio to be 1: 1.5, stirring and mixing uniformly to prepare a continuous phase.
5) Preparing an emulsion: adding the dispersed phase into a storage tank of an SPG membrane emulsification device, and extruding the dispersed phase to the continuous phase through a through hole on the SPG membrane under the pressure action of nitrogen to form the emulsion, wherein the aperture of the through hole of the SPG membrane is 5 microns, and the pressurization value is 0.08 Mpa; stirring to keep the emulsion stable; the stirring speed was 200 rpm.
6) Polymerization: pouring the emulsion into a reaction container, heating to 38 ℃, starting stirring, introducing nitrogen for 90 minutes, displacing dissolved oxygen, and stirring at the speed of 300 rpm; heating to 80 ℃, wherein the heating rate is 2 ℃/min, reacting for 9 hours, and introducing nitrogen into the emulsion in the reaction process; and after the reaction is finished, cooling to below 40 ℃, discharging, and filtering to obtain the pressure-sensitive adhesive microsphere suspension.
7) Preparing glue: and washing and filtering the pressure-sensitive adhesive microsphere suspension, and taking a paste enrichment phase to obtain the microsphere pressure-sensitive adhesive.
8) Gluing: uniformly coating the microsphere-based pressure sensitive adhesive on the surface of the substrate 100 by using a bar coater with a gap of 20 microns; and then placing the obtained product in an environment with the temperature of 50 ℃ for pre-drying for 5 minutes, and then placing the obtained product in an environment with the temperature of 80 ℃ for drying for 8 minutes to form the microspheric pressure-sensitive adhesive coating 200 and obtain the pressure-sensitive adhesive tape capable of being repeatedly pasted.
Example 2
The present embodiment is different from embodiment 1 in that: the microspheric pressure-sensitive adhesive coating 200 comprises the following raw materials in percentage by mass: 79kg of isooctyl acrylate; 4kg of methyl methacrylate; 2kg of acrylic acid; 4kg of hydroxyethyl acrylate; 2kg of acetoacetoxyethyl methacrylate; 1.2kg of a non-ionic surfactant; 2.2kg of an anionic surfactant; 0.5kg of a polymeric dispersant; 0.3kg of initiator; 3kg of thickening agent, 0.8kg of plasticizer, 0.5kg of glycidyl methacrylate and 0.5kg of mildew preventive.
In the method for manufacturing the pressure-sensitive adhesive tape capable of being repeatedly pasted provided in this embodiment:
3) preparation of dispersed phase: and weighing isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, acetoacetoxyethyl methacrylate, glycidyl methacrylate and an initiator according to the proportion, and stirring and mixing uniformly to obtain the dispersed phase.
7) Preparing glue: and washing and filtering the pressure-sensitive adhesive microsphere suspension, taking a paste enrichment phase, adding a thickening agent, a plasticizer and a mildew preventive in a proportioning amount into the paste enrichment phase, and uniformly stirring to obtain the microspheric pressure-sensitive adhesive.
Example 3
The present embodiment differs from the embodiment in that: the microspheric pressure-sensitive adhesive coating 200 comprises the following raw materials in percentage by mass: 85kg of isooctyl acrylate; 2kg of methyl methacrylate; 3kg of acrylic acid; 2kg of hydroxyethyl acrylate; 1kg of acetoacetoxyethyl methacrylate; 1kg of a nonionic surfactant; 2kg of an anionic surfactant; 0.7kg of a polymeric dispersant; 0.5kg of initiator; 2kg of thickener, 0.3kg of plasticizer, 0.3kg of glycidyl methacrylate and 0.2kg of mildewcide.
The initiator comprises the following raw materials: benzoyl peroxide and 2, 2-azobisisobutyronitrile, wherein the mass ratio of the two is 1: 1. the substrate 100 is a polyethylene foam substrate 100 having a density of 90kg/m3。
The embodiment of the invention also provides a preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted, which comprises the following steps:
1) pretreatment of monomers: weighing isooctyl acrylate with a proportioning amount, and washing for 8 times by using 25 liters of 2mol/L NaOH solution; then repeatedly washing the mixture with distilled water to be neutral, and removing NaOH; drying for 24 hr with desiccant, and filtering to remove desiccant.
2) Heat treatment of the substrate 100: preparing a polyethylene foam plastic base material 100, putting the polyethylene foam plastic base material 100 into a hot air oven, heating to 97 ℃, and carrying out heat treatment for 10 minutes; cooling to room temperature at a cooling rate of 2 deg.C/min.
3) Preparation of dispersed phase: and weighing isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, acetoacetoxyethyl methacrylate, glycidyl methacrylate and an initiator according to the proportion, and stirring and mixing uniformly to obtain the dispersed phase.
4) Preparation of continuous phase: weighing the nonionic surfactant, the anionic surfactant and the polymer dispersant according to the proportion, adding deionized water, and controlling the oil-water ratio to be 1: 2, stirring and mixing uniformly to prepare a continuous phase.
5) Preparing an emulsion: adding the dispersed phase into a storage tank of an SPG membrane emulsification device, and extruding the dispersed phase to the continuous phase through a through hole on the SPG membrane under the pressure action of nitrogen to form the emulsion, wherein the aperture of the through hole of the SPG membrane is 8 microns, and the pressurization value is 0.06 MPa; stirring to keep the emulsion stable; the stirring speed was 300 rpm.
6) Polymerization: pouring the emulsion into a reaction container, heating to 43 ℃, starting stirring, introducing nitrogen for 60 minutes, displacing dissolved oxygen, and stirring at the speed of 400 rpm; heating to 85 ℃, wherein the heating rate is 3 ℃/min, reacting for 6 hours, and introducing nitrogen into the emulsion in the reaction process; and after the reaction is finished, cooling to below 40 ℃, discharging, and filtering to obtain the pressure-sensitive adhesive microsphere suspension.
7) Preparing glue: and washing and filtering the pressure-sensitive adhesive microsphere suspension, taking a paste enrichment phase, adding a thickening agent, a plasticizer and a mildew preventive in a proportioning amount into the paste enrichment phase, and uniformly stirring to obtain the microspheric pressure-sensitive adhesive.
8) Gluing: uniformly coating the microsphere-based pressure sensitive adhesive on the surface of the substrate 100 by using a bar coater with a gap of 60 micrometers; and then placing the obtained product in an environment with the temperature of 60 ℃ for pre-drying for 4 minutes, and then placing the obtained product in an environment with the temperature of 90 ℃ for drying for 5 minutes to form the microspheric pressure-sensitive adhesive coating 200 and obtain the pressure-sensitive adhesive tape capable of being repeatedly pasted.
Example 4
The present embodiment is different from embodiment 1 in that: the microspheric pressure-sensitive adhesive coating 200 comprises the following raw materials in percentage by mass: 80kg of isooctyl acrylate; 3kg of methyl methacrylate; 1kg of acrylic acid; 3kg of hydroxyethyl acrylate; 1.5kg of acetoacetoxyethyl methacrylate; 1.4kg of a non-ionic surfactant; 7kg of an anionic surfactant; 0.8kg of a polymeric dispersant; 0.6kg of initiator; 1kg of thickening agent, 0.5kg of plasticizer, 0.1kg of glycidyl methacrylate and 0.1kg of mildew preventive.
The initiator comprises the following raw materials: benzoyl peroxide and 2, 2-azobisisobutyronitrile, wherein the mass ratio of the two is 1: 1.2. the substrate 100 is a polyethylene foam substrate 100 having a density of 110kg/m3。
The embodiment of the invention also provides a preparation method of the pressure-sensitive adhesive tape capable of being repeatedly pasted, which comprises the following steps:
1) pretreatment of monomers: weighing isooctyl acrylate with a proportioning amount, and washing for 2 times by using 25 liters of 2.2mol/L NaOH solution; then repeatedly washing the mixture with distilled water to be neutral, and removing NaOH; drying for 24 hr with desiccant, and filtering to remove desiccant.
2) Heat treatment of the substrate 100: preparing a polyethylene foam plastic base material 100, putting the polyethylene foam plastic base material 100 into a hot air oven, heating to 107 ℃, and carrying out heat treatment for 8 minutes; cooling to room temperature at a rate of 3 deg.C/min.
3) Preparation of dispersed phase: and weighing isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, acetoacetoxyethyl methacrylate, glycidyl methacrylate and an initiator according to the proportion, and stirring and mixing uniformly to obtain the dispersed phase.
4) Preparation of continuous phase: weighing the nonionic surfactant, the anionic surfactant and the polymer dispersant according to the proportion, adding deionized water, and controlling the oil-water ratio to be 1: 3, stirring and mixing uniformly to prepare a continuous phase.
5) Preparing an emulsion: adding the dispersed phase into a storage tank of an SPG membrane emulsification device, and extruding the dispersed phase to the continuous phase through a through hole on the SPG membrane under the pressure action of nitrogen to form the emulsion, wherein the aperture of the through hole of the SPG membrane is 13 microns, and the pressurization value is 0.02 Mpa; stirring to keep the emulsion stable; the stirring speed was 400 rpm.
6) Polymerization: pouring the emulsion into a reaction container, heating to 48 ℃, starting stirring, introducing nitrogen for 30 minutes, and displacing dissolved oxygen at a stirring speed of 500 pm; heating to 90 ℃, wherein the heating rate is 5 ℃/min, reacting for 3 hours, and introducing nitrogen into the emulsion in the reaction process; and after the reaction is finished, cooling to below 40 ℃, discharging, and filtering to obtain the pressure-sensitive adhesive microsphere suspension.
7) Preparing glue: and washing and filtering the pressure-sensitive adhesive microsphere suspension, taking a paste enrichment phase, adding a thickening agent, a plasticizer and a mildew preventive in a proportioning amount into the paste enrichment phase, and uniformly stirring to obtain the microspheric pressure-sensitive adhesive.
8) Gluing: uniformly coating the microsphere-based pressure sensitive adhesive on the surface of the substrate 100 by using a bar coater with a gap of 100 micrometers; and then placing the obtained product in an environment with the temperature of 70 ℃ for pre-drying for 3 minutes, and then placing the obtained product in an environment with the temperature of 100 ℃ for drying for 2 minutes to form the microspheric pressure-sensitive adhesive coating 200 and obtain the pressure-sensitive adhesive tape capable of being repeatedly pasted.
Example 5
In this example, the peel strength of the pressure-sensitive adhesive tapes obtained in examples 1 to 4, the peel strength after 100 times of repeated sticking, and the peel strength after 7 days of 2kg weight were measured, and the results are shown in Table 1. The 180 DEG peel strength is tested according to the regulations of the national standard GB/T2792.
TABLE 1
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A pressure-sensitive adhesive tape capable of being repeatedly pasted comprises a base material and a microspheric pressure-sensitive adhesive coating arranged on the surface of the base material; the microsphere pressure-sensitive adhesive coating is characterized by comprising the following raw materials in percentage by mass:
75-85% of isooctyl acrylate;
2-6% of methyl methacrylate;
1-3% of acrylic acid;
2-6% hydroxyethyl acrylate;
1-3% of acetoacetoxyethyl methacrylate;
1-1.5% of a nonionic surfactant;
2-7% of an anionic surfactant;
0.5-1% of a polymeric dispersant; and
0.3-1% of an initiator.
2. The repeatedly adherable pressure-sensitive adhesive tape according to claim 1, wherein the microsphere-based pressure-sensitive adhesive coating further comprises the following raw materials in mass percent: 1 to 3 percent of thickening agent, 0.3 to 0.8 percent of plasticizer, 0.1 to 0.5 percent of glycidyl methacrylate and 0.1 to 0.5 percent of mildew preventive.
3. The repositionable pressure sensitive tape of claim 2, wherein the initiator comprises the following raw materials: benzoyl peroxide and 2, 2-azobisisobutyronitrile, wherein the mass ratio of the two is 1: 0.8 to 1.2.
4. The repeatedly attachable pressure-sensitive adhesive tape according to claim 2 or 3, wherein the polymeric dispersant is PVA 1788; the nonionic surfactant is a nonionic surfactant A-980; the anionic surfactant is an anionic surfactant A-6820.
5. The repeatedly adherable pressure-sensitive adhesive tape according to claim 2 or 3, which isCharacterized in that the base material is a polyethylene foam base material, and the density of the base material is 60-110 kg/m3。
6. The method for producing a repeatedly attachable pressure-sensitive adhesive tape according to any one of claims 2 to 5, comprising the steps of:
1) preparation of dispersed phase: weighing isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, acetoacetoxyethyl methacrylate, glycidyl methacrylate and an initiator according to the proportion, and stirring and mixing uniformly to prepare the dispersed phase;
2) preparation of continuous phase: weighing the nonionic surfactant, the anionic surfactant and the polymer dispersant according to the proportion, adding deionized water, and controlling the oil-water ratio to be 1: 1.5-3, stirring and mixing uniformly to prepare a continuous phase;
3) preparing an emulsion: adding the dispersed phase into a storage tank of an SPG membrane emulsification device, and extruding the dispersed phase to the continuous phase through a through hole on the SPG membrane under the pressure action of nitrogen to form the emulsion, wherein the pressurization value is 0.02-0.08 Mpa; stirring to keep the emulsion stable; the stirring speed is 200-400 rpm;
4) polymerization: pouring the emulsion into a reaction container, heating to 38-48 ℃, starting stirring, introducing nitrogen for 30-90 minutes, and displacing dissolved oxygen at the stirring speed of 300-500 rpm; heating to 80-90 ℃, wherein the heating rate is 2-5 ℃/min, and reacting for 3-9 hours; after the reaction is finished, cooling to below 40 ℃, discharging, and filtering to obtain a pressure-sensitive adhesive microsphere suspension;
5) preparing glue: and washing and filtering the pressure-sensitive adhesive microsphere suspension, taking a paste enrichment phase, adding a thickening agent, a plasticizer and a mildew preventive in a proportioning amount into the paste enrichment phase, and uniformly stirring to obtain the microspheric pressure-sensitive adhesive.
6) Gluing: uniformly coating the microspheric pressure-sensitive adhesive on the surface of the substrate by using a wire bar coater with a gap of 20-100 microns; and then placing the obtained product in an environment with the temperature of 50-70 ℃ for pre-drying for 3-5 minutes, and then placing the obtained product in an environment with the temperature of 80-100 ℃ for drying for 2-8 minutes to form the microspheric pressure-sensitive adhesive coating and prepare the pressure-sensitive adhesive tape capable of being repeatedly pasted.
7. The method of manufacturing a repeatedly attachable pressure-sensitive adhesive tape according to claim 6, further comprising the steps of:
7) pretreatment of monomers: weighing isooctyl acrylate with a proportioning amount, and washing the isooctyl acrylate with 1.8-2.2 mol/L NaOH solution for 2-8 times; then repeatedly washing the mixture with distilled water to be neutral, and removing NaOH; and adding a drying agent, drying for 8-24 hours, and filtering to remove the drying agent.
8. The method of manufacturing a repeatedly attachable pressure-sensitive adhesive tape according to claim 6, further comprising the steps of:
8) heat treatment of the substrate: preparing a polyethylene foam plastic base material, putting the polyethylene foam plastic base material into a hot air oven, heating to 87-107 ℃, and carrying out heat treatment for 8-12 minutes; cooling to room temperature at a cooling rate of 1-3 deg.C/min.
9. The method of producing a repeatedly adherable pressure-sensitive adhesive tape according to any one of claims 6 to 8, wherein the pore diameter of the through-hole of the SPG film is 5 to 13 μm.
10. The method of manufacturing a pressure-sensitive adhesive tape capable of being repeatedly applied according to any one of claims 6 to 8, wherein nitrogen gas is introduced into the emulsion during the reaction in the step 4).
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