An adhesive tape exhibiting debonding upon electrification, method for manufacturing the same, and applications thereof

Abstract

This invention discloses a non-adhesive tape that loses its tack upon energization, its preparation method, and its application, relating to adhesive materials. An octahedral ligand-modified CNC composite is prepared. Acrylic copolymer main resin, dipole-responsive acrylate monomer, solvent, and dispersant are weighed and mixed according to the specified ratio. A photoinitiator is added, and UV prepolymerization is carried out under nitrogen protection. An ion transport medium, tackifying resin, and anti-exudation agent are added. The mixture is heated, subjected to high-speed shear emulsification, cooled, and the octahedral ligand-modified CNC composite is added, reacting to obtain an adhesive. The adhesive is coated onto a plasma-treated PET release film, dried with hot air, and the plasma-treated PET release film is adhered to the other side of the adhesive layer. A second UV curing is performed to obtain the non-adhesive tape that loses its tack upon energization. The non-adhesive tape prepared by this invention has advantages such as strong adhesion, sensitive response, significant difference in peel force before and after energization, no peel residue, cycle stability, and low energization loss.

Claims

1. A type of adhesive tape that loses its stickiness upon being energized, comprising an adhesive layer and upper and lower release layers, wherein the adhesive layer is composed of an adhesive, wherein, The adhesive, by weight, comprises the following raw material components: 60-70 parts of isoborneol acrylate-hydroxypropyl acrylate copolymer; 12-18 parts of 1-ethyl-3-methylimidazolium bis(trifluoromethane)sulfonylimine salt; 8-12 parts of tetrahydrofuran acrylate monomer or ethoxylated tetrahydrofuran acrylate monomer; 6.5-10 parts of [Fe(bpy)3]3+ type octahedral coordination complex; 20-30 parts of solvent; 6-10 parts of hydrogenated C9 petroleum resin; 1-2 parts of polydimethylsiloxane-polyethylene oxide block copolymer; and 0.9-1.5 parts of polyoxyethylene lauryl ether or fluoroalkyl epoxy or its adducts.

2. The adhesive tape that loses its adhesion after being energized, as described in claim 1, wherein, The isobornyl acrylate-hydroxypropyl acrylate copolymer contains 8-12 wt% hydroxypropyl acrylate, and its specific preparation steps are as follows: A1. Under a nitrogen atmosphere, toluene, isobornyl acrylate, hydroxypropyl acrylate, and a chain transfer agent are sequentially added to a four-necked flask, heated to 65°C, and stirred at 300 r / min; In step A1, the chain transfer agent is n-dodecyl mercaptan; A2. The initiator is dissolved in toluene to obtain an initiator solution, which is slowly added dropwise to the four-necked flask of step A1 over 1 hour through a constant pressure dropping funnel. The reaction is carried out at 65°C with stirring for 4 hours, then heated to 75°C for 2 hours, and then heated to 85°C for 1 hour to obtain a mixed solution; In step A2, the ratio of initiator to toluene is 1 g: 10 mL, and the initiator is azobisisobutyronitrile; the amount of initiator is 0.5% of the total mass of isobornyl acrylate and hydroxypropyl acrylate; A3. The mixed solution is cooled to 40℃, and the adsorbent is added and stirred for 30 minutes to obtain a crude solution. The crude solution is poured into n-hexane to precipitate, and the precipitate is filtered repeatedly three times. The precipitate is then vacuum dried at 50℃ for 24 hours to obtain a transparent, elastic granular acrylate copolymer main resin. In step A3, the adsorbent is 97% diatomaceous earth and 3% activated carbon; the amount of adsorbent used is 2-3% of the total mass of the mixed solution. The volume ratio of the crude product solution to n-hexane is 1:(9-11).

3. A type of adhesive tape that loses its adhesiveness after being energized, as described in claim 2, wherein, In step A1, the ratio of toluene, isobornyl acrylate, hydroxypropyl acrylate, and chain transfer agent is (160-180) mL:70 g:30 g:0.1 g.

4. A method for preparing an adhesive tape that loses its adhesion upon energization as described in any one of claims 1-3, wherein, The process includes the following steps: S1. Dispersing carboxylated cellulose nanocrystals in tetrahydrofuran and homogenizing by ultrasonication for 30 min, adding 2,2-bipyridine-4,4-diol and p-toluenesulfonic acid, reacting at 60℃ and 500 r / min for 5-8 h, centrifuging, precipitating, and washing to obtain bipyridine-modified CNCs, dispersing the bipyridine-modified CNCs in propylene glycol methyl ether acetate, adding acetone iron, and reacting at room temperature and 800 r / min for 12 h to obtain [Fe(bpy)3]3+ type octahedral coordination complex; In step S1, the mass ratio of the carboxylated cellulose nanocrystals, 2,2-bipyridine-4,4-diol, and acetoacetone iron is (4-6):(1.92-2.88):(0.6-1); the dosage ratio of the carboxylated cellulose nanocrystals, tetrahydrofuran, and propylene glycol methyl ether acetate is 1g:40mL:10mL; the dosage of p-toluenesulfonic acid is 0.1% of the total mass of the carboxylated cellulose nanocrystals, tetrahydrofuran, and 2,2-bipyridine-4,4-diol; S2, according to the formula, weigh out the isoborneol acrylate-hydroxypropyl acrylate copolymer, tetrahydrofuran acrylate monomer or ethoxylated tetrahydrofuran acrylate monomer, solvent, and polyoxyethylene lauryl ether or fluoroalkyl epoxy or its adduct and mix them, add a photoinitiator, perform UV prepolymerization under nitrogen protection, add 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and hydrogenated C9 Petroleum resin and polydimethylsiloxane-polyethylene oxide block copolymer are heated to 50-55℃ and reacted using a high-speed shear emulsifier at 15000 r / min for 20-30 min. The temperature is then lowered to 40-45℃, and the [Fe(bpy)3]3+ octahedral coordination complex obtained in step S1 is added. The reaction is carried out at 300 r / min for 2-3 h to obtain an adhesive. In step S2, the photoinitiator is photoinitiator 819. The amount of photoinitiator used is 0.05-0.09% of the total mass of isoborneol acrylate-hydroxypropyl acrylate copolymer, tetrahydrofuran acrylate monomer or ethoxylated tetrahydrofuran acrylate monomer, solvent, and polyoxyethylene lauryl ether or fluoroalkyl epoxy or its adduct. S3. Apply the adhesive to the plasma-treated PET release film I, dry it with hot air at 80°C for 3 minutes, then attach the plasma-treated PET release film II to the other side of the adhesive layer and perform a second UV curing to obtain a tape that loses its adhesion after being powered on.

5. The application of any one of the power-on non-adhesive tapes described in any of claims 1-3 in the fields of reusable tapes for electronic components, smart packaging, metal applications, and medical electrode patches.