A low-noise, low-viscosity and removable acrylic pressure-sensitive adhesive and its preparation method

Abstract

This application relates to the field of pressure-sensitive adhesives, and specifically discloses a low-noise, low-tack removable acrylic pressure-sensitive adhesive and a preparation method thereof. A low-noise, low-tack removable acrylic pressure-sensitive adhesive is made from the following raw materials in parts by mass: 50-150 parts of acrylic resin, 1-15 parts of isocyanate crosslinking agent, 1-20 parts of plasticizer, and 8-40 parts of solvent. The preparation method is as follows: S1. Prepare raw materials according to the ratio, dissolve the acrylic resin in the solvent to obtain mixture A; S2. Add the isocyanate crosslinking agent to mixture A, and obtain mixture B after full reaction; S3. Add the plasticizer to mixture B, and obtain a low-noise, low-tack removable acrylic pressure-sensitive adhesive after full reaction. This application has the effect of meeting the requirement of low noise during peeling while maintaining the properties of low tack and not being easily residual of the acrylic pressure-sensitive adhesive product.

Description

Technical Field

[0001] The present application relates to the field of pressure-sensitive adhesives, and particularly to a low-noise, low-tack, removable acrylic pressure-sensitive adhesive and a preparation method thereof. Background Art

[0002] Acrylic pressure-sensitive adhesives are a common type of adhesive that can tightly bond to an object under a small external force. Acrylic pressure-sensitive adhesives have strong coating adaptability and fast drying speed, and have a wide range of application fields.

[0003] When acrylic pressure-sensitive adhesives are applied to daily necessities such as labels or process protection films, the product needs to be peeled off from the adhered object after use. Therefore, it is required that both the initial tack and the holding tack of the pressure-sensitive adhesive are at a relatively low level. In addition, the adhered object needs to be used continuously after the pressure-sensitive adhesive product is peeled off, and the residual acrylic pressure-sensitive adhesive on the object will have a negative impact on its use performance and aesthetic degree. Therefore, certain requirements are also imposed on the removable performance of the adhesive.

[0004] During daily use, pressure-sensitive adhesive products are prone to generate a certain amount of noise during peeling, bringing a poor experience to users. Therefore, how to make acrylic pressure-sensitive adhesive products meet the requirement of low noise during peeling while maintaining properties such as low tack and low residue is an urgent problem to be solved at present. Summary of the Invention

[0005] In order to make acrylic pressure-sensitive adhesive products meet the requirement of low noise during peeling while maintaining properties such as low tack and low residue, the present application provides a low-noise, low-tack, removable acrylic pressure-sensitive adhesive and a preparation method thereof.

[0006] In a first aspect, the present application provides a low-noise, low-tack, removable acrylic pressure-sensitive adhesive, adopting the following technical solution:

[0007] A low-noise, low-tack, removable acrylic pressure-sensitive adhesive is made from the following raw materials in parts by mass:

[0008] Acrylic resin 50 - 150 parts

[0009] Isocyanate crosslinking agent 1 - 15 parts

[0010] Plasticizer 1 - 20 parts

[0011] Solvent 8 - 40 parts.

[0012] By adopting the above technical solution, an isocyanate crosslinking agent is added to the acrylic resin system. The carboxyl group on the acrylic resin molecular chain reacts with the isocyanate group of the isocyanate crosslinking agent, increasing the crosslinking density of the acrylic resin and improving the initial tack and holding tack of the system;

[0013] A plasticizer is added to the acrylic resin system. The plasticizer molecules weaken the intermolecular forces between the acrylic resin molecules, lower the glass transition temperature of the system, improve the plasticity and flexibility of the pressure-sensitive adhesive, and at the same time reduce the viscosity of the system. By using an isocyanate cross-linking agent and a plasticizer in combination, the initial tack and holding tack of the pressure-sensitive adhesive can be adjusted to a lower level required for acrylic pressure-sensitive adhesive products. The noise generated when the adhesive substance obtained by the reaction breaks after deformation is reduced, and the removability is significantly improved. While maintaining the low viscosity and non-residual properties of the acrylic pressure-sensitive adhesive products, the requirement of low noise during peeling is met.

[0014] Optionally, the glass transition temperature of the acrylic resin is (0 ± 13) °C.

[0015] By adopting the above technical solution, an acrylic resin with a glass transition temperature in the range of (0 ± 13) °C is selected. On the one hand, the possibility of the acrylic resin system undergoing a glass transition during the reaction is reduced, avoiding affecting the physical properties of the pressure-sensitive adhesive. After adding a plasticizer to the system, the glass transition temperature of the pressure-sensitive adhesive is further reduced, making the pressure-sensitive adhesive products less affected by changes in the use environment temperature. On the other hand, when selecting an acrylic resin with a glass transition temperature lower than -13 °C, although the influence of temperature on the properties of the pressure-sensitive adhesive can also be reduced, the initial tack and holding tack of the acrylic resin system increase, and the removability decreases.

[0016] Optionally, the weight-average molecular weight of the acrylic resin is 4×10 5 -7×10 5 . More preferably, the grade of the acrylic resin is selected from one of SG-708-6, WS-023, and SG-700AS, and is purchased from Nagase ChemteX Corporation.

[0017] By adopting the above technical solution, an acrylic resin with a weight-average molecular weight in the range of 4×10 5 -7×10 5 can be used to prepare a pressure-sensitive adhesive with low viscosity, non-residual, and low noise. Selecting an acrylic resin with a grade of SG-708-6, WS-023, or SG-700AS as the raw material can not only meet the requirement of low noise during peeling while maintaining the low viscosity and non-residual properties of the acrylic pressure-sensitive adhesive products, but also endow the pressure-sensitive adhesive with excellent high-temperature resistance. Among them, the pressure-sensitive adhesive prepared from the acrylic resin with the grade of WS-023 has the best performance.

[0018] Optionally, the plasticizer is a phthalate plasticizer.

[0019] By adopting the above technical solution, the phthalate plasticizer has low toxicity, is not easy to volatilize, has a small odor, can effectively weaken the interaction force between the molecular chains of the acrylic resin, and can significantly improve the removability and peeling noise of the pressure-sensitive adhesive product when used in combination with the isocyanate crosslinking agent, and plays an adjusting role in the initial adhesion and holding adhesion of the pressure-sensitive adhesive.

[0020] Optionally, the isocyanate crosslinking agent is selected from one or more of polymethylene polyphenyl polyisocyanate, hydrogenated xylylene diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

[0021] By adopting the above technical solution, polymethylene polyphenyl polyisocyanate is a mixture composed of diphenylmethane diisocyanate and polyisocyanate with a functionality greater than 2. Compared with diphenylmethane diisocyanate, it has lower activity, which is convenient for controlling the crosslinking degree of the acrylic resin, so that the viscosity of the pressure-sensitive adhesive is easy to adjust;

[0022] Hydrogenated xylylene diisocyanate and hexamethylene diisocyanate can endow the pressure-sensitive adhesive with excellent weather resistance and reduce the influence of the change of the use environment temperature on the performance of the pressure-sensitive adhesive product;

[0023] Isophorone diisocyanate has relatively low activity, and the activity of the isocyanate groups on its alicyclic chain is much lower than that on the straight chain, which is convenient for adjusting the initial adhesion and holding adhesion of the pressure-sensitive adhesive.

[0024] Optionally, the isocyanate crosslinking agent is a mixture of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate. More preferably, the mass ratio of polymethylene polyphenyl polyisocyanate to isophorone diisocyanate is 1:(1.5 - 2).

[0025] By adopting the above technical solution, when the isocyanate crosslinking agent is a mixture of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate, a pressure-sensitive adhesive with low viscosity, not easy to remain, low noise and high temperature resistance can be obtained. Through experiments, it is found that when the mass ratio of polymethylene polyphenyl polyisocyanate to isophorone diisocyanate is within the range of 1:(1.5 - 2), the performance of the pressure-sensitive adhesive is the best.

[0026] Optionally, the low-noise and low-viscosity removable acrylic pressure-sensitive adhesive is made from the following raw materials in parts by mass:

[0027] Acrylic resin 60 - 85 parts

[0028] Isocyanate crosslinking agent 4 - 10 parts

[0029] Plasticizer 2 - 10 parts

[0030] Solvent 12 - 23 parts.

[0031] By adopting the above technical solution, increasing the proportion of the isocyanate crosslinking agent in the pressure-sensitive adhesive system can improve the chemical resistance, weather resistance and mechanical properties of the pressure-sensitive adhesive. Through experiments, it is found that when the isocyanate crosslinking agent is a mixture of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate, although increasing the proportion of the isocyanate crosslinking agent increases the crosslinking density of the pressure-sensitive adhesive, the initial tack and holding tack of the pressure-sensitive adhesive do not increase significantly. This may be because the isocyanate groups on the alicyclic chain of part of the isophorone diisocyanate do not participate in the reaction, and the isocyanate groups have strong polarity and interact with the polar groups of the plasticizer, thereby reducing the viscosity of the system.

[0032] In a second aspect, the present application provides a method for preparing a low-noise, low-tack removable acrylic pressure-sensitive adhesive, adopting the following technical solution:

[0033] A method for preparing a low-noise, low-tack removable acrylic pressure-sensitive adhesive, comprising the following steps:

[0034] S1. Prepare raw materials according to the ratio, dissolve the acrylic resin in a solvent to obtain a mixture A;

[0035] S2. Add an isocyanate crosslinking agent to the mixture A, and obtain a mixture B after sufficient reaction;

[0036] S3. Add a plasticizer to the mixture B, and obtain a low-noise, low-tack removable acrylic pressure-sensitive adhesive after sufficient reaction.

[0037] By adopting the above technical solution, the isocyanate crosslinking agent is first fully reacted with the acrylic resin to increase the crosslinking density of the system, and then the plasticizer is added to adjust the overall viscosity of the pressure-sensitive adhesive to the required range. While maintaining the low-tack and non-residual properties of the acrylic pressure-sensitive adhesive product, it meets the requirement of low noise during peeling.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. The isocyanate crosslinking agent increases the crosslinking density of the acrylic resin, improving the initial tack and holding tack of the system; the plasticizer can reduce the glass transition temperature of the system, improving the plasticity and flexibility of the pressure-sensitive adhesive, and at the same time reducing the viscosity of the system; through the combined use of the isocyanate crosslinking agent and the plasticizer, the initial tack and holding tack of the pressure-sensitive adhesive can be adjusted to a lower level required for the acrylic pressure-sensitive adhesive product, the noise generated when the deformed and broken adhesive substance is reduced, and the removable performance is significantly improved;

[0040] 2. Select one of the acrylic resins with the grades of SG-708-6, WS-023, and SG-700AS as the raw material, which can not only meet the requirement of low noise during peeling while maintaining the properties of the acrylic pressure-sensitive adhesive product such as low tack and not easy to remain, but also endow the pressure-sensitive adhesive with excellent high-temperature resistance. Among them, the pressure-sensitive adhesive made of the acrylic resin with the grade of WS-023 has the best performance; 3. When the isocyanate cross-linking agent is a mixture of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate, although increasing the proportion of the isocyanate cross-linking agent improves the cross-linking density of the pressure-sensitive adhesive, the initial tack and holding tack of the pressure-sensitive adhesive do not increase significantly. This may be because the isocyanate groups on the alicyclic chain of part of the isophorone diisocyanate do not participate in the reaction, and the isocyanate groups have strong polarity and interact with the polar groups of the plasticizer, thus reducing the viscosity of the system. Detailed implementation mode

[0041] Source of raw materials

[0042] Unless otherwise specified, the specifications of the raw materials used in the examples and comparative examples of this application are as follows.

[0043] Acrylic resin, model: SG-790, glass transition temperature -32 °C, weight average molecular weight 5×10 5 ;

[0044] Model: SG-70L, glass transition temperature -13 °C, weight average molecular weight 9×10 5 ;

[0045] Model: SG-P3, glass transition temperature 12 °C, weight average molecular weight 8.5×10 5 ;

[0046] Model: SG-80H, glass transition temperature 11 °C, weight average molecular weight 3.5×10 5 ;

[0047] Model: SG-700AS, glass transition temperature 5 °C, weight average molecular weight 4×10 5 ;

[0048] Model: SG-708-6, glass transition temperature 4 °C, weight average molecular weight 7×10 5 ;

[0049] Model: WS-023, glass transition temperature -10 °C, weight average molecular weight 5×10 5 ;

[0050] The above-mentioned acrylic resins of various models were all purchased from Nagase ChemteX Corporation.

[0051] Plasticizer: dioctyl phthalate;

[0052] Diisooctyl phthalate;

[0053] Dimethyl phthalate.

[0054] Isocyanate crosslinking agent: polymethylene polyphenyl polyisocyanate, model: BASF M20s;

[0055] Hydrogenated benzodimethylenediisocyanate;

[0056] Hexamethylene diisocyanate;

[0057] Isophorone diisocyanate.

[0058] Solvent: ethyl acetate.

[0059] Performance detection test

[0060] Specimen preparation

[0061] Take the pressure-sensitive adhesives prepared in the examples and comparative examples and coat them on commercially available non-adhesive sticky notes respectively. The thickness of the pressure-sensitive adhesive is 0.5 mm. Cut the sticky notes made from each example or comparative example into specimens 1 with dimensions of 175 mm × 25 mm, specimens 2 with dimensions of 150 mm × 150 mm, and specimens 3 with dimensions of 25.4 mm × 203.2 mm.

[0062] Detection method

[0063] Test 1: Detection of initial adhesion performance

[0064] Test method: According to FTM9 in the FINAT test method, test the circular initial adhesion of each specimen 1.

[0065] Test 2: Detection of holding adhesion performance

[0066] Test method: According to FTM8 in the FINAT test method, test the holding adhesion of each specimen 1.

[0067] Test 3: Test method for peel strength detection: According to FTM1 in the FINAT test method, after placing specimen 1 under standard conditions of 23°C ± 2°C and 50% RH ± 5% RH for 4 h, stick it on a standard test plate made of clean glass. Use a test roller to press it 2 times in each direction at a speed of 10 mm / s. After placing it for 20 min and 24 h, perform 180° peeling at a peeling speed of 300 mm / min respectively, and test the short-term peel force (20 min) and permanent peel force (24 h) of each specimen 1.

[0068] Test 4: High-temperature resistance performance detection Test method: Take sample 2 and place it under the standard conditions of 23°C ± 2°C and 50% RH ± 5% RH for 4 hours. Then stick it on a standard test plate made of clean glass, bake it in an oven at 150°C for 30 minutes, take it out, measure the size of sample 2 after baking, and observe whether there is deformation or warping.

[0069] Test 5: Removability performance detection Test method: Take sample 3 and place it under the standard conditions of 23°C ± 2°C and 50% RH ± 5% RH for 4 hours. Then stick it on test plates made of clean glass, polyethylene substrate, and steel plate respectively. Use a test roller to press it 2 times in each direction at a speed of 10 mm / s, and conduct a 180° peel at a peel speed of 300 mm / min. Observe whether there is residual glue after the peel of sample 3, and calculate the ratio of the area of the residual pressure-sensitive adhesive on the test plate to the pasting area.

[0070] Test 6: Peel noise detection Test method: Take sample 3 and place it under the standard conditions of 23°C ± 2°C and 50% RH ± 5% RH for 4 hours. Then stick it on test plates made of clean glass, polyethylene substrate, and steel plate respectively. Use a test roller to press it 2 times in each direction at a speed of 10 mm / s, and conduct a 180° peel at a peel speed of 300 mm / min. Observe whether there is noise during the peel, and evaluate the noise level: 0 no obvious noise, 1 slight noise, 2 obvious noise, 3 large noise.

[0071] Examples

[0072] Example 1

[0073] A low-noise and low-adhesion removable acrylic pressure-sensitive adhesive is prepared through the following steps:

[0074] Q1. Weigh 500 g of acrylic resin (brand: SG-790), 10 g of hexamethylene diisocyanate, 100 g of dioctyl phthalate, 40 g of ethyl acetate for resin, and 40 g of ethyl acetate for plasticizer.

[0075] Q2. Dissolve the acrylic resin in the ethyl acetate for resin to obtain mixture A.

[0076] Q3. Add hexamethylene diisocyanate to mixture A, and fully react at 23°C to obtain mixture B.

[0077] Q4. Dilute dioctyl phthalate in the ethyl acetate for plasticizer, add the diluted plasticizer to mixture B, and fully react at 23°C to obtain a low-noise and low-adhesion removable acrylic pressure-sensitive adhesive.

[0078] Examples 2 - 3

[0079] Example 2-3 is different from Example 1 in that the dosages of each component are different, as shown in Table 1 below.

[0080] Table 1 Dosages of Each Component in Example 2-3

[0081] Example Example 2 Example 3 Acrylic resin (SG-790) 1200g 1500g Hexamethylene diisocyanate 150g 90g Dioctyl phthalate 200g 10g Ethyl acetate 300g 400g

[0082] Examples 4-6

[0083] Examples 4-6 are different from Example 2 in that the types of acrylic resins are different, as shown in Table 2 below.

[0084] Table 2 Types of Acrylic Resins in Examples 4-6

[0085]

[0086] The performance test results of Examples 1-6 are shown in Table 3 below.

[0087] Table 3 Performance Test Results of Examples 1-6

[0088]

[0089]

[0090] Combining Example 2 and Examples 4-6 and referring to Table 3, it can be seen that the glass transition temperature of the acrylic resin selected in Example 2 is -32 °C, and the glass transition temperature of the acrylic resins selected in Examples 4-6 is in the range of (0 ± 13) °C. Compared with the pressure-sensitive adhesive prepared in Example 2, the pressure-sensitive adhesive prepared in Examples 4-6 has lower viscosity, less residual adhesive after peeling, and less peeling noise. Therefore, by selecting an acrylic resin with a glass transition temperature in the range of (0 ± 13) °C, the prepared pressure-sensitive adhesive has better performance, and while maintaining the properties of low viscosity and non-residue of the acrylic pressure-sensitive adhesive product, it meets the requirement of low noise during peeling.

[0091] Examples 7-9

[0092] Examples 7-9 are different from Example 2 in that the types of acrylic resins are different, as shown in Table 4 below.

[0093] Table 4 Types of Acrylic Resins in Examples 7-9

[0094]

[0095]

[0096] The performance test results of Examples 7-9 are shown in Table 5 below.

[0097] Table 5 Performance Test Results of Examples 7-9

[0098]

[0099] Combined with Examples 4-9 and in combination with Tables 3 and 5, it can be seen that the weight-average molecular weight of the acrylic resin selected in Examples 4 and 5 is greater than 7×10 5 , the weight-average molecular weight of the acrylic resin selected in Example 6 is less than 4×10 5 , and the weight-average molecular weight of the acrylic resin selected in Examples 7-9 is in the range of 4×10 5 -7×10 5 . However, the pressure-sensitive adhesives prepared in Examples 7-9 have lower adhesiveness, less residue, less noise, and improved high-temperature resistance. Therefore, 4×10 5 -7×10 5 is the preferred range for the weight-average molecular weight of the acrylic resin.

[0100] Among Examples 7-9, the pressure-sensitive adhesive prepared in Example 9 has the best performance. Therefore, WS-023 selected in Example 9 is the optimal model of the acrylic resin.

[0101] Examples 10-11

[0102] The difference between Examples 10-11 and Example 9 lies in the type of plasticizer, as shown in Table 6 below.

[0103] Table 6 Types of plasticizers in Examples 10-11

[0104]

[0105] The performance test results of Examples 10-11 are shown in Table 7 below.

[0106] Table 7 Performance test results of Examples 10-11

[0107]

[0108] Examples 12-16

[0109] The difference between Examples 12-16 and Example 9 lies in the type and dosage of the isocyanate crosslinking agent, as shown in Table 8 below.

[0110] Table 8 Types and dosages of isocyanate crosslinking agents in Examples 12-16

[0111]

[0112] The performance test results of Examples 12-16 are shown in Table 9 below.

[0113] Table 9 Performance test results of Examples 12-16

[0114]

[0115]

[0116] Combining Example 9 and Examples 12 - 16 and referring to Table 5 and Table 9, it can be seen that the pressure - sensitive adhesive prepared in Example 14 has lower adhesiveness, less peel residue, and less peel noise. Therefore, when a mixture of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate is used as the cross - linker, the prepared pressure - sensitive adhesive is more suitable for daily necessities such as labels or process protection films.

[0117] Examples 17 - 19

[0118] The difference between Examples 17 - 19 and Example 14 lies in the different dosages of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate. See the following Table 10 for details.

[0119] Table 10 Dosages of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate in Examples 17 - 19

[0120]

[0121] The performance test results of Examples 17 - 19 are shown in the following Table 11.

[0122] Table 11 Performance test results of Examples 17 - 19

[0123]

[0124]

[0125] Combining Example 14 and Examples 17 - 19 and referring to Table 9 and Table 11, it can be seen that the performance of the pressure - sensitive adhesive prepared in Examples 17 - 19 is better than that prepared in Example 14. Therefore, 1:(1.5 - 2) is the preferred range of the mass ratio of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate.

[0126] Examples 20 - 22

[0127] The difference between Examples 20 - 22 and Example 17 lies in the different dosages of each component. See the following Table 12 for details.

[0128] Table 12 Dosages of each component in Examples 20 - 22

[0129]

[0130]

[0131] The performance test results of Examples 20 - 22 are shown in the following Table 13.

[0132] Performance test results of Examples 20 - 22 in Table 13

[0133]

[0134] Combining Example 17 and Examples 20 - 22 and combining Tables 11 and 13, it can be seen that in Examples 20 - 22, the proportion of the isocyanate crosslinking agent is increased. Although the crosslinking density of the system increases, the initial tack and holding tack of the pressure - sensitive adhesive are less affected. This may be because the isocyanate groups on the alicyclic chain of part of the isophorone diisocyanate do not participate in the reaction, and the isocyanate groups have strong polarity and interact with the polar groups of the plasticizer, thereby reducing the viscosity of the system.

[0135] Comparative example

[0136] Comparative Example 1

[0137] The difference between Comparative Example 1 and Example 2 is that the same mass of divinylbenzene is selected to replace hexamethylene diisocyanate as the crosslinking agent.

[0138] Comparative Example 2

[0139] Comparative Example 2 uses the pressure - sensitive adhesive prepared in Example 1 of a heat - de - tackifying adhesive, a heat - de - tackifying protective film and a preparation method with the application publication number of CN114989778A.

[0140] The performance test results of Comparative Examples 1 - 2 are shown in Table 14 below.

[0141] Table 14 Performance test results of Comparative Examples 1 - 2

[0142]

[0143]

[0144] Combining Example 2 and Comparative Examples 1 - 2 and combining Tables 3 and 14, it can be seen that through the modification of the isocyanate crosslinking agent and the plasticizer, the viscosity of the pressure - sensitive adhesive can be adjusted to a lower level required for acrylic pressure - sensitive adhesive products. The noise generated when the adhesive substance obtained by the reaction breaks after deformation is reduced, and the removability performance and high - temperature resistance performance are significantly improved.

[0145] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A low-noise, low-viscosity and removable acrylic pressure-sensitive adhesive, characterized in that, it is made from the following raw materials in parts by mass: 50 - 150 parts of acrylic resin; 1 - 15 parts of isocyanate cross-linking agent; 1 - 20 parts of plasticizer; 8 - 40 parts of solvent; the glass transition temperature of the acrylic resin is (0 ± 13) °C; The weight-average molecular weight of the acrylic resin is 4×10 5 -7×10 5 ; the isocyanate cross-linking agent is a mixture of polymethylene polyphenyl polyisocyanate and isophorone diisocyanate; the plasticizer is a phthalate plasticizer.

2. The low-noise, low-viscosity and removable acrylic pressure-sensitive adhesive according to claim 1, characterized in that, it is made from the following raw materials in parts by mass: 60 - 85 parts of acrylic resin 4 - 10 parts of isocyanate cross-linking agent 2 - 10 parts of plasticizer 12 - 23 parts of solvent.

3. The preparation method of the low-noise, low-viscosity and removable acrylic pressure-sensitive adhesive according to any one of claims 1 - 2, characterized in that, it includes the following steps: S1. Prepare raw materials according to the ratio, dissolve the acrylic resin in the solvent to obtain mixture A; S2. Add the isocyanate cross-linking agent to mixture A, and obtain mixture B after full reaction; S3. Add the plasticizer to mixture B, and obtain a low-noise, low-viscosity and removable acrylic pressure-sensitive adhesive after full reaction.

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