Easy-to-remove adhesive strip, method of making and use in die cut parts

Abstract

The application discloses an easy-to-disassemble adhesive tape, a preparation method and application of the adhesive tape in die-cutting parts, and relates to the design of the adhesive into a strip, the strip-shaped pattern being formed by a doctor blade coating method, the gap between a bottom roller and a glue groove being blocked by an adhesive film, the non-glued part being uniformly coated on the surface layer of the material by the adhesive film, and the adhesive tape being used for wrapping a battery; when the battery needs to be taken out, alcohol is added at the passage, the alcohol is dissolved with the adhesive, the adhesive strength of the back adhesive is weakened, and thus the battery is easily taken out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesives, in particular to an easy-to-disassemble adhesive tape, a preparation method thereof and application thereof in die-cut parts. BACKGROUND

[0002] In the processing of digital products such as mobile phones, notebook computers and tablet computers, double-sided adhesive die-cut parts are often used to fix internal parts of mobile phones, notebook computers and tablet computers. For example, the adhesion of batteries and machine bodies / mainboards, the fixation of camera modules, and the adhesion of wire harnesses. The thin feature can provide reliable adhesion without increasing the thickness of the mobile phone, and can adapt to the complex structure and narrow space inside the mobile phone / notebook computer / tablet computer.

[0003] CN112300718A discloses a tape and its application, and a processing method of a tape bonding assembly. The tape of the application comprises a substrate, and the substrate has adhesive layers on both sides. The substrate itself is a layerable material, or comprises a separable material layer that can be separated by a solvent. When used for battery bonding, it is convenient to disassemble. When disassembling the battery, the solvent is immersed into the substrate to separate the separable material layer, thereby reducing the strength of the substrate, and the battery can be easily disassembled without stretching. The shape of the die-cut part of the tape is variable, and the tape does not need to be heated, which will not affect the battery and avoid the risk of battery explosion due to heating. However, its design is complex, and the processing cost is high. SUMMARY

[0004] In view of the above-mentioned defects of the prior art, the present application provides an easy-to-disassemble adhesive tape and a preparation method thereof, which can provide reliable adhesion performance in die-cut parts, and can be directly dissolved by alcohol to lose adhesion, so that the battery can be easily disassembled.

[0005] The specific technical solutions are as follows:

[0006] A preparation method of an easy-to-disassemble adhesive tape: 80-90 parts by weight of methacrylamide, 8-12 parts by weight of viscosity regulator, 10-15 parts by weight of isopropyl alcohol, and 2-5 parts by weight of photoinitiator are stirred and mixed uniformly to obtain a glue solution, which is coated into a strip by a doctor blade coating method, and is cured and formed under ultraviolet light to obtain the easy-to-disassemble adhesive tape.

[0007] A preparation method of an easy-to-disassemble adhesive tape: 1-5 parts by weight of straight-chain starch, 75-85 parts by weight of methacrylamide, 8-12 parts by weight of viscosity regulator, 10-15 parts by weight of isopropyl alcohol, and 2-5 parts by weight of photoinitiator are stirred and mixed uniformly to obtain a glue solution, which is coated into a strip by a doctor blade coating method, and is cured and formed under ultraviolet light to obtain the easy-to-disassemble adhesive tape.

[0008] A preparation method of the easy-to-disassemble adhesive tape: taking 1-5 parts of modified straight-chain starch, 75-85 parts of methacrylamide, 8-12 parts of viscosity regulator, 10-15 parts of isopropyl alcohol, 2-5 parts of photoinitiator, stirring and mixing uniformly to obtain glue solution; coating into a strip by doctor blade coating method, curing and forming under ultraviolet, to obtain the easy-to-disassemble adhesive tape.

[0009] A preparation method of the easy-to-disassemble adhesive tape: taking 1-5 parts of modified straight-chain starch, 75-85 parts of methacrylamide, 8-12 parts of viscosity regulator, 10-15 parts of isopropyl alcohol, 2-5 parts of photoinitiator, stirring and mixing uniformly to obtain glue solution; coating into a strip by doctor blade coating method, curing and forming under ultraviolet, to obtain the easy-to-disassemble adhesive tape.

[0010] Methacrylamide, as a polymer monomer, is cured and formed under the action of photoinitiator and ultraviolet light, which can provide good bonding performance for the adhesive tape. The molecular structure of the adhesive tape based on methacrylamide has a certain polarity and is sensitive to alcohol.

[0011] Alcohol: ethanol molecules can reduce the intermolecular interaction force of the adhesive tape, causing the adhesive to dissolve, and realizing the disassembly operation between the subsequent adhesive tape and the die-cut part.

[0012] The branched starch has excellent adhesion ability and can be used as the basic component of the adhesive tape; the methacrylamide can undergo polymerization reaction, and after the addition of the photoinitiator, it can gradually change the adhesive tape from the original sticky state to a certain hardness of the cured state, and the curing effect is improved.

[0013] Straight-chain starch: in the present application, as an additive component, the straight-chain starch interacts with methacrylamide, hydroxyethyl cellulose and other components to increase the overall viscosity of the glue solution, thereby improving the peel strength of the adhesive tape. In the ultraviolet curing process, the straight-chain starch may interact with the photoinitiator to improve the curing effect and make the performance of the adhesive tape more stable.

[0014] Modified straight-chain starch: in the present application, the straight-chain starch is modified by using 4-chlorophenyl isocyanate, 3-trifluoromethyl phenyl isocyanate and other reagents. It has a stronger interaction with methacrylamide. The functional groups may change the electron cloud distribution of the straight-chain starch molecules, can chemically react with methacrylamide molecules to form chemical bonds, thereby enhancing the intermolecular bonding force; the functional groups may also change the spatial structure and polarity of the molecules, increase the physical interaction between the methacrylamide molecules, form a more stable network structure in the adhesive tape, limit the movement of the molecules, and improve the mechanical properties and stability of the adhesive tape.

[0015] Preferably, the viscosity regulator is any one of hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose and polyvinyl acetate. Most preferably, the viscosity regulator is hydroxyethyl cellulose.

[0016] Preferably, the photoinitiator is any one of 2-hydroxy-2-methylpropiophenone, benzophenone, trimethylbenzoylphenyl phosphine oxide, 1-hydroxycyclohexyl phenyl ketone. Most preferably, the photoinitiator is 2-hydroxy-2-methylpropiophenone.

[0017] Preferably, the UV curing is performed under a UV lamp at 365 nm for 3-8 min. Most preferably, the curing time is 5 min.

[0018] Further, the modified amylose is modified by 4-chlorophenyl isocyanate and / or 3-(trifluoromethyl)phenyl isocyanate.

[0019] Further, the modified amylose is 4-chlorophenyl isocyanate modified amylose and / or 3-(trifluoromethyl)phenyl isocyanate modified amylose. Most preferably, the modified amylose is 4-chlorophenyl isocyanate modified amylose and 3-(trifluoromethyl)phenyl isocyanate modified amylose in a mass ratio of 1:0.8-1.2.

[0020] Preferably, the preparation method of the 4-chlorophenyl isocyanate modified amylose is: vacuum drying 8-12 g of amylose at 110-130 °C for 3-5 h, cooling to 102-108 °C, stirring and refluxing in 25-75 mL of N,N-dimethylacetamide for 10-15 h, cooling to 20-30 °C, adding 0.2-0.5 g of lithium chloride, heating to 70-90 °C after 2-6 h, adding 20-80 mL of pyridine, adding 30-80 g of 4-chlorophenyl isocyanate after 3-5 h, cooling to room temperature after 10-20 h, and then settling, centrifuging, washing, and drying.

[0021] Preferably, the preparation method of the 3-(trifluoromethyl)phenyl isocyanate modified amylose is: vacuum drying 8-12 g of amylose at 110-130 °C for 3-5 h, cooling to 102-108 °C, stirring and refluxing in 25-75 mL of N,N-dimethylacetamide for 10-15 h, cooling to 20-30 °C, adding 0.2-0.5 g of lithium chloride, heating to 70-90 °C after 2-6 h, adding 20-80 mL of pyridine, and mixing with 30-80 g of 3-(trifluoromethyl)phenyl isocyanate, cooling to room temperature after 10-20 h, and then settling, centrifuging, washing, and drying.

[0022] N,N-dimethylacetamide as a reaction solvent, can be straight starch and other reagents to provide a suitable reaction environment. Lithium chloride as a catalyst, affect the molecular structure of amylose change, help to promote the subsequent reaction. Pyridine as a reaction solvent, and N,N-dimethylacetamide together for the reaction to provide a suitable environment. The 4-chlorophenyl isocyanate and 3-(trifluoromethyl) phenyl isocyanate as a modification reagent, and the hydroxyl (-OH) on the amylose chemical reaction, on the amylose molecule to introduce the corresponding isocyanate group (-N=C=O), thereby changing the chemical structure and properties of amylose.

[0023] The application also discloses the application of the easy-to-disassemble adhesive tape in the die-cutting piece, and specifically as follows.

[0024] Through the doctor blade coating method, the adhesive film is used to block the strip-shaped pattern at the gap between the bottom roller and the adhesive groove, the non-adhesive part is uniformly coated on the material surface layer by using the adhesive film to shield, and then the material is cut into the required shape through six 150 DEG C ovens. The non-adhesive area can make alcohol penetrate quickly, and the adhesive is dissolved by alcohol, so that the adhesive loses adhesion, and the battery can be easily disassembled.

[0025] The application has the following beneficial effects.

[0026] 1. Compared with the prior art, the easy-to-disassemble adhesive tape can provide reliable bonding performance, and can be used in the die-cutting piece to paste components such as batteries. When the battery needs to be taken out, only alcohol needs to be added at the passage, the alcohol is dissolved with the adhesive, so that the adhesive tape loses adhesion, and the battery can be easily disassembled, thereby solving the problem that some adhesive tapes are difficult to disassemble in the prior art.

[0027] 2. In the application, methyl acrylamide and hydroxyethyl cellulose are selected to be cured and formed under the action of a photoinitiator and ultraviolet light, so that the adhesive tape can provide good bonding performance; the adhesion is not obviously affected during the aging process, the adhesive tape is sensitive to alcohol, and subsequent disassembly work is facilitated.

[0028] 3. In the application, branched amylose, straight amylose or modified straight amylose is selected to be added to improve the formula of the adhesive tape, so that the stability of the adhesive tape is improved, the bonding performance between the adhesive tape and the bonded material is affected, bonding defects are reduced, and the peel strength is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The figure is a diagram of the application of the easy-to-disassemble adhesive tape in the die-cutting piece. The yellow color is a battery, the blue color is the easy-to-disassemble adhesive tape (die-cutting piece), and the gap is a passage for injecting alcohol. DETAILED DESCRIPTION

[0030] The parameters and sources of specific chemical substances are as follows.

[0031] Hydroxyethyl cellulose: viscosity (mPa·s) 2% aqueous solution at 20℃ 60000, from Shandong Gomeisi Chemical Co., Ltd.

[0032] 3-(trifluoromethyl) isocyanate phenyl: CAS No.: 329-01-1.

[0033] 4-chlorophenyl isocyanate, CAS No.: 104-12-1.

[0034] Example 1

[0035] A preparation method of an easy-to-disassemble adhesive tape is as follows: 85 g of methacrylamide, 10 g of hydroxyethyl cellulose, 12 mL of isopropyl alcohol, and 0.3 g of 2-hydroxy-2-methylpropiophenone are stirred at room temperature 25℃ at 100 r / min for 1 min to obtain a glue solution, which is coated into a strip by means of a doctor blade coating method, and the coating amount is 0.1 g / m 2 Cured under a 365 nm ultraviolet lamp for 5 min to obtain the easy-to-disassemble adhesive tape.

[0036] Example 2

[0037] A preparation method of an easy-to-disassemble adhesive tape is as follows: 5 g of branched amylose and 80 g of methacrylamide are stirred at 100 r / min for 10 min under nitrogen; then 10 g of hydroxyethyl cellulose, 12 mL of isopropyl alcohol, and 0.3 g of 2-hydroxy-2-methylpropiophenone are stirred at room temperature 25℃ at 100 r / min for 1 min to obtain a glue solution, which is coated into a strip by means of a doctor blade coating method, and the coating amount is 0.1 g / m 2 Cured under a 365 nm ultraviolet lamp for 5 min to obtain the easy-to-disassemble adhesive tape.

[0038] Example 3

[0039] A preparation method of an easy-to-disassemble adhesive tape is as follows: 5 g of modified branched amylose and 80 g of methacrylamide are stirred at 100 r / min for 10 min under nitrogen; then 10 g of hydroxyethyl cellulose, 12 mL of isopropyl alcohol, and 0.3 g of 2-hydroxy-2-methylpropiophenone are stirred at room temperature 25℃ at 100 r / min for 1 min to obtain a glue solution, which is coated into a strip by means of a doctor blade coating method, and the coating amount is 0.1 g / m 2 Cured under a 365 nm ultraviolet lamp for 5 min to obtain the easy-to-disassemble adhesive tape.

[0040] The synthesis method of the modified branched amylose is: 10 g of branched amylose is vacuum dried at 120℃ for 4h, cooled to 105℃, stirred at 100r / min in 50mL of N,N-dimethylacetamide under reflux for 12h, cooled to 25℃, 0.3g of lithium chloride is added, after 4h, heated to 80℃, 50mL of pyridine, 60g of 3-(trifluoromethyl) phenyl isocyanate is mixed, after 16h, cooled to room temperature, 100mL of methanol is added to settle and centrifuge, 100mL of methanol is washed for 3 times, and vacuum dried at 60℃ for 8h.

[0041] Example 4

[0042] A preparation method of an easy-to-disassemble adhesive tape is: 5g of linear amylose, 80g of methacrylamide are stirred at 100r / min under nitrogen for 10min; then 10g of hydroxyethyl cellulose, 12mL of isopropyl alcohol, and 0.3g of 2-hydroxy-2-methylpropiophenone are stirred at 100r / min at room temperature of 25℃ for 1min to obtain a glue solution, which is coated into a strip by means of a doctor blade coating method, and the coating amount is 0.1g / m 2 , and cured under a 365nm ultraviolet lamp for 5min to obtain the easy-to-disassemble adhesive tape.

[0043] Example 5

[0044] A preparation method of an easy-to-disassemble adhesive tape is: 5g of modified linear amylose A, 80g of methacrylamide are stirred at 100r / min under nitrogen for 10min; then 10g of hydroxyethyl cellulose, 12mL of isopropyl alcohol, and 0.3g of 2-hydroxy-2-methylpropiophenone are stirred at 100r / min at room temperature of 25℃ for 1min to obtain a glue solution, which is coated into a strip by means of a doctor blade coating method, and the coating amount is 0.1g / m 2 , and cured under a 365nm ultraviolet lamp for 5min to obtain the easy-to-disassemble adhesive tape.

[0045] The synthesis method of the modified linear amylose A is: 10g of linear amylose is vacuum dried at 120℃ for 4h, cooled to 105℃, stirred at 100r / min in 50mL of N,N-dimethylacetamide under reflux for 12h, cooled to 25℃, 0.3g of lithium chloride is added, after 4h, heated to 80℃, 50mL of pyridine is added, after 4h, 50g of 4-chlorophenyl isocyanate is added, after 16h, cooled to room temperature, 100mL of methanol is added to settle and centrifuge, 50mL of methanol is washed for 3 times, and vacuum dried at 60℃ for 8h.

[0046] Example 6

[0047] A preparation method of the easy-to-rip adhesive tape is as follows: 5 g of modified straight starch B, 80 g of methacrylamide are stirred at 100 r / min under nitrogen for 10 min; then 10 g of hydroxyethyl cellulose, 12 mL of isopropyl alcohol, and 0.3 g of 2-hydroxy-2-methylpropiophenone are stirred at 100 r / min at room temperature of 25 DEG C for 1 min to obtain a glue solution, which is coated into a strip by means of a doctor blade coating method, and the coating amount is 0.1 g / m 2 The easy-to-rip adhesive tape is obtained by curing under a 365 nm ultraviolet lamp for 5 min.

[0048] The synthesis method of the modified straight starch B is as follows: 10 g of straight starch is vacuum dried at 120 DEG C for 4 h, and then stirred at 100 r / min in 50 mL of N,N-dimethylacetamide under reflux at 105 DEG C for 12 h; after being cooled to 25 DEG C, 0.3 g of lithium chloride is added, and after 4 h, the temperature is raised to 80 DEG C, 50 mL of pyridine and 50 g of 3-(trifluoromethyl) isocyanate phenyl ester are added, and after 16 h, the temperature is cooled to room temperature; 100 mL of methanol is added for sedimentation and centrifugation, and 50 mL of methanol is used for washing three times, and then vacuum drying is carried out at 60 DEG C for 8 h.

[0049] Example 7

[0050] A preparation method of the easy-to-rip adhesive tape is as follows: 5 g of modified straight starch B, 80 g of methacrylamide are stirred at 100 r / min under nitrogen for 10 min; then 10 g of hydroxyethyl cellulose, 12 mL of isopropyl alcohol, and 0.3 g of 2-hydroxy-2-methylpropiophenone are stirred at 100 r / min at room temperature of 25 DEG C for 1 min to obtain a glue solution, which is coated into a strip by means of a doctor blade coating method, and the coating amount is 0.1 g / m 2 The easy-to-rip adhesive tape is obtained by curing under a 365 nm ultraviolet lamp for 5 min.

[0051] The preparation method of the modified straight starch A is consistent with that of Example 5, which is not described herein again.

[0052] The preparation method of the modified straight starch B is consistent with that of Example 6, which is not described herein again.

[0053] Application example

[0054] The application of the easy-to-rip adhesive tapes of Examples 1-7 in die cutting parts is as follows:

[0055] The coating amount is 0.1 g / m 2 The gap between the bottom roller and the glue groove is blocked into a strip pattern by means of a doctor blade coating method, and the part without glue is uniformly coated on the material surface layer by means of a glue film; after passing through 6 ovens at 150 DEG C, the required shape is die cut, the area without glue can make alcohol penetrate quickly, the alcohol dissolves the back glue, so that the adhesive loses adhesion, and the battery can be easily removed.

[0056] Test Example 1

[0057] Peeling test

[0058] The sample preparation and test were carried out according to GB / T 2792-2014 Test method for adhesive tape peel strength, as follows:

[0059] The adhesive strips prepared in Examples 1-7 were poured on a 25mm x 200mm sample, and the release film was torn off and attached to a standard steel plate specially used for adhesive tape test, which was cleaned with alcohol. The position of the adhesive tape was ensured to have an effective peeling length of about 100mm. Then, the adhesive tape was placed on a non-woven fabric and rolled back and forth for 3 times with a 2kg roller, and then placed in a test room for a specified time before testing.

[0060] During the test, a computer tensile testing machine of HB-B01-D model produced by Master Industrial System (China) Co., Ltd. was used to test the 180° peeling strength of the glass and adhesive film interface of the adhesive strips prepared in Examples 1-5 at a stretching rate of 100mm / min, and the average value of 3 tests was taken. The results are shown in Table 1.

[0061] Accelerated aging test: the adhesive tapes prepared in Examples 1-5 above were placed in an environment of 66℃ and 80% relative humidity for 96h, and then left in a standard laboratory condition for a certain period of time. After the adhesive tapes were restored to the standard environmental conditions, the predetermined test was carried out according to the above method.

[0062] Table 1 Aging resistance test results

[0063]

[0064]

[0065] The adhesive tapes of Examples 1-7 were smooth on the surface after aging, without cracks, bubbles, discoloration and other phenomena, and had no obvious difference with those before aging, indicating that the adhesion was not significantly affected during the aging process, and further indicating that the easy-to-remove adhesive tape of the present application has good stability.

[0066] As can be seen from the above table, the adhesion and heat aging resistance of the easy-to-remove adhesive tapes of Examples 2-7 are significantly better than those of the easy-to-remove adhesive tape of Example 1. Compared with the easy-to-remove adhesive tape of Example 4, the easy-to-remove adhesive tape of Example 2 added branched amylose. The linear macromolecules of the glucose units of the straight-chain amylose are connected by α-1,4-glycosidic bonds, while the presence of branched chains makes the distance between the molecular chains relatively large, and the hydrogen bond interaction between the molecular chains is relatively weak. The corresponding connection points are relatively few and unevenly distributed, and when subjected to a peeling force, the connection points are easily destroyed one by one, resulting in that the peeling strength of Example 2 before and after aging is not as good as that of Example 4.

[0067] The branched amylose added in Example 2 compared to the 3-(trifluoromethyl) phenyl isocyanate modified branched amylose added in Example 3, the branched amylose has many hydroxyl groups on the molecule, which undergoes nucleophilic addition reaction with isocyanate groups, increasing the interaction between the adherend, thereby affecting the adhesive strength of the adhesive tape. The branched amylose has a large number of short branches in the molecule, and the molecular chains are not tightly entangled and highly crosslinked like linear polymers, and an excess of 3-(trifluoromethyl) phenyl isocyanate is required for modification, and the residual modified reagent can interfere with the performance of the modified branched amylose, and cause environmental pollution or harm. When applied to a detachable adhesive tape for battery bonding, the force between it and the adherend surface is relatively weak, and after ultraviolet curing, the adhesive tape of Example 3 can cause the adhesive tape to be relatively hard, losing certain detachable properties.

[0068] Further, the modified straight-chain amylose is added in the easy-to-detach adhesive of Examples 5-7. The straight-chain amylose or modified straight-chain amylose can interact with other ingredients such as methacrylamide, hydroxyethyl cellulose, etc., increasing the overall viscosity of the adhesive solution, thereby improving the peel strength. Moreover, during the ultraviolet curing process, the straight-chain amylose or modified straight-chain amylose can interact with the photoinitiator, improving the curing effect and making the performance of the adhesive tape more stable.

[0069] In comparison, the addition of modified straight-chain amylose is better than the addition of straight-chain amylose. The reasons are as follows: first, the isocyanate groups in the molecular structure of 4-chlorophenyl isocyanate and 3-(trifluoromethyl) phenyl isocyanate of the modified straight-chain amylose have higher reactivity than the straight-chain amylose, and chemically react with the hydroxyl groups in the straight-chain amylose molecule; second, the modified straight-chain amylose has a stronger interaction with methacrylamide, forming a more stable network structure in the adhesive tape, which can prevent the breaking and crosslinking of the molecular chain, thereby improving the bonding performance and heat aging resistance of the adhesive tape.

[0070] The 4-chlorophenyl isocyanate added in the modified straight-chain amylose of Example 5 compared to the 3-(trifluoromethyl) phenyl isocyanate in the modified straight-chain amylose of Example 6, the former has smaller steric hindrance and is easier to interact with methacrylamide, thereby better transmitting stress when the adhesive tape is subjected to external force, and thereby improving the bonding performance and aging resistance of the adhesive tape.

[0071] The present application enhances the internal synergistic effect of the adhesive strip by introducing modified starch containing isocyanate groups. The isocyanate groups react with the hydroxyl groups in the amylose molecules to form a stable cross-linked network structure, and under the hydrogen bonding of the hydroxyl groups of the hydroxyethyl cellulose, the bonding strength and heat aging resistance are improved. At the same time, the unique molecular characteristics of 4-chlorophenyl isocyanate and 3-(trifluoromethyl) phenyl isocyanate play a complementary role: the former has small steric hindrance and moderate polarity, which is conducive to the formation of a tight cross-linked network and improves the bonding strength; the strong electron-attracting effect of the latter enhances the aging resistance and chemical stability. The combination of the two significantly improves the mechanical properties and stability of the adhesive strip.

Claims

1. A method of preparing a readily removable adhesive tape, characterized by It comprises the following steps: taking 1-5 parts of starch, 75-85 parts of methacrylamide, 8-12 parts of viscosity modifier, 10-15 parts of isopropyl alcohol, 2-5 parts of photoinitiator, stirring and mixing uniformly to obtain glue solution; coating into a strip by doctor blade coating method, and curing and forming under ultraviolet; the starch is 4-chlorophenyl isocyanate modified straight chain starch and 3-trifluoromethyl phenyl isocyanate modified straight chain starch with a mass ratio of 1:0.8-1.2; The preparation method of the 4-chlorophenyl isocyanate modified straight chain starch is: taking 8-12g straight chain starch, vacuum drying at 110-130℃ for 3-5h, cooling to 102-108℃, stirring and refluxing in 25-75mL N,N-dimethylacetamide for 10-15h, cooling to 20-30℃, adding 0.2-0.5g lithium chloride, heating to 70-90℃ after 2-6h, adding 20-80mL pyridine, adding 30-80g 4-chlorophenyl isocyanate after 3-5h, cooling to room temperature after 10-20h, and then settling, centrifuging, washing and drying; The preparation method of the 3-trifluoromethyl phenyl isocyanate modified straight chain starch is: taking 8-12g straight chain starch, vacuum drying at 110-130℃ for 3-5h, cooling to 102-108℃, stirring and refluxing in 25-75mL N,N-dimethylacetamide for 10-15h, cooling to 20-30℃, adding 0.2-0.5g lithium chloride, heating to 70-90℃ after 2-6h, adding 20-80mL pyridine, adding 30-80g 3-trifluoromethyl phenyl isocyanate after 3-5h, mixing, cooling to room temperature after 10-20h, and then settling, centrifuging, washing and drying.

2. The method of claim 1, wherein: The viscosity modifier is any one of hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose and polyvinyl acetate.

3. The method of claim 1, wherein: The photoinitiator is any one of 2-hydroxy-2-methylpropiophenone, benzophenone, trimethylbenzoyl phenyl phosphine oxide and 1-hydroxycyclohexyl benzophenone.

4. The method of claim 1, wherein: The ultraviolet curing and forming is under a 365nm ultraviolet lamp for 3-8min.

5. A strip of easy-to- remove adhesive, characterized in that Prepared by the method of any one of claims 1-4.

6. The use of the easy-to-disassemble adhesive tape in die cutting pieces according to claim 5.

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