Acrylic acid pressure-sensitive adhesive cleaning agent as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cleaning agents, in particular to an acrylic pressure-sensitive adhesive cleaning agent and a preparation method and application thereof.The acrylic pressure-sensitive adhesive cleaning agent is prepared from, by mass, 11%-15.5% of persulfate, 2.3%-2.8% of ascorbic acid and / or ascorbate, 13%-16.2% of glycol ether, 0.75%-0.9% of ferrous salt, 2%-2.4% of organic acid, 4.5%-5.8% of oxidizing agent and the balance water. The acrylic pressure-sensitive adhesive cleaning agent provided by the invention is excellent in cleaning effect and efficient.

Description

Technical Field

[0001] This application relates to the field of cleaning agent technology, and in particular to acrylic pressure-sensitive adhesive cleaning agents, their preparation methods, and applications. Background Technology

[0002] During the processing and transportation of 3C electronic product casings, a protective film coated with acrylic pressure-sensitive adhesive is usually applied to the surface of the casing to prevent scratches and dirt. Since acrylic pressure-sensitive adhesive is sensitive to temperature and humidity, the cohesion of areas with weaker cohesion becomes even weaker due to the influence of temperature and humidity. As a result, when the protective film is peeled off, the acrylic pressure-sensitive adhesive with weakened cohesion is transferred to the surface of the casing, and may even be partially anchored in the micro-cracks on the surface of the casing.

[0003] Traditionally, water-based cleaning agents are used to clean the acrylic pressure-sensitive adhesive on the shell surface. However, water-based cleaning agents are mainly alkaline for degreasing and oil removal. Generally, the product with the acrylic pressure-sensitive adhesive is first soaked in the water-based cleaning agent for a long time to allow the cleaning agent to penetrate / swell the adhesive film. Then, the shearing force generated by ultrasonic vibration is used to peel off the residual adhesive. However, the cleaning agent is difficult to completely penetrate the microcracks, and the ultrasonic shearing force is also difficult to effectively act on the dead areas in the microcracks. Therefore, the cleaning effect of traditional water-based cleaning agents is poor and the time is long. Summary of the Invention

[0004] Based on this, this application provides an acrylic pressure-sensitive adhesive cleaning agent, its preparation method and application, which has excellent and efficient cleaning effect.

[0005] The first aspect of this application provides an acrylic pressure-sensitive adhesive cleaning agent, comprising, by weight percentage, 11% to 15.5% persulfate, 2.3% to 2.8% ascorbic acid and / or ascorbate salt, 13% to 16.2% glycol ether, 0.75% to 0.9% ferrous salt, 2% to 2.4% organic acid, 4.5% to 5.8% oxidant, with the balance being water.

[0006] In some embodiments, the persulfate includes at least one of ammonium persulfate, sodium persulfate, and potassium persulfate.

[0007] In some embodiments, ascorbate salts include at least one of sodium ascorbate and potassium ascorbate.

[0008] In some embodiments, the glycol ether includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, and ethylene glycol methyl ether.

[0009] In some embodiments, the ferrous salt includes at least one of ferrous sulfate, ferrous chloride, ferrous acetate, and ferrous oxalate.

[0010] In some embodiments, the organic acid includes at least one of citric acid, malic acid, and lactic acid; and / or, the oxidizing agent includes at least one of hydrogen peroxide and sodium perborate.

[0011] In some implementations, the pH value of the acrylic pressure-sensitive adhesive cleaner is 2.7 to 3.3.

[0012] In some embodiments, the surface tension of the acrylic pressure-sensitive adhesive cleaner is 26.5 dyn / cm to 29.2 dyn / cm.

[0013] The second aspect of this application provides a method for preparing an acrylic pressure-sensitive adhesive cleaning agent, comprising the following steps:

[0014] An acrylic pressure-sensitive adhesive cleaning agent is prepared by mixing persulfate, ascorbic acid and / or ascorbate salt, glycol ether, ferrous salt, organic acid, oxidant and water.

[0015] The mass percentage of each raw material is as follows:

[0016] Persulfate: 11%~15.5%, ascorbic acid and / or ascorbate salt: 2.3%~2.8%, glycol ether: 13%~16.2%, ferrous salt: 0.75%~0.9%; organic acid: 2%~2.4%, oxidant: 4.5%~5.8%, balance: water.

[0017] In some embodiments, the acrylic pressure-sensitive adhesive cleaning agent provided in the first aspect of this application, or the acrylic pressure-sensitive adhesive cleaning agent prepared by the preparation method provided in the second aspect of this application, is used in the cleaning of electronic products. Compared with conventional technologies, this application has the following advantages:

[0018] This application constructs a reaction system of ferrous salt / persulfate / ascorbic acid and / or ascorbate / oxidant / organic acid to ensure the continuous generation of sulfate and hydroxyl radicals during the cleaning process of acrylic pressure-sensitive adhesive cleaner, thereby achieving efficient and thorough decomposition of acrylic pressure-sensitive adhesive. Specifically: Under acidic conditions, the Fe in the ferrous salt... 2+ It reacts with persulfate to generate sulfate radicals and Fe. 3+ Fe in ferrous salts 2+ It reacts with oxidants to generate hydroxyl radicals and Fe. 3+ Sulfate radicals and hydroxyl radicals attack the molecular chains of acrylic pressure-sensitive adhesives, achieving chemical decomposition; the Fe generated in the reaction 3+ It can be rapidly reduced to Fe by ascorbic acid and / or ascorbate. 2+It is reused to activate persulfate to generate sulfate radicals and to activate oxidants to generate hydroxyl radicals, thus realizing the catalytic cycle of iron ions and the continuous generation of sulfate radicals and hydroxyl radicals, thereby efficiently and continuously decomposing acrylic pressure-sensitive adhesive residues. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram illustrating the preparation method of acrylic pressure-sensitive adhesive cleaning agent in some embodiments of this application. Detailed Implementation

[0021] A detailed reference is now provided to embodiments of this application, one or more of which are described below. Each embodiment is provided for explanation and not for limitation. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to this application without departing from its scope or spirit. For example, features described or illustrated as part of one embodiment may be used in another embodiment to produce further embodiments.

[0022] Therefore, this application is intended to cover such modifications and variations falling within the scope of the appended claims and their equivalents. Other objects, features, and aspects of this application are disclosed in or will be apparent from the following detailed description. It will be understood by those skilled in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of this application.

[0023] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0024] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0025] In this article, when referring to units of data ranges, if a unit is only followed by the right endpoint, it means that the units of the left and right endpoints are the same.

[0026] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0027] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0028] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0029] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0030] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0031] The first aspect of this application provides an acrylic pressure-sensitive adhesive cleaning agent, comprising, by weight percentage, 11% to 15.5% persulfate, 2.3% to 2.8% ascorbic acid and / or ascorbate salt, 13% to 16.2% glycol ether, 0.75% to 0.9% ferrous salt, 2% to 2.4% organic acid, 4.5% to 5.8% oxidant, with the balance being water.

[0032] It is understood that the mass percentage of persulfate in acrylic pressure-sensitive adhesive cleaner is 11% to 15.5%, for example, 11%, 13.5%, 14%, 14.5%, 15%, 15.2%, 15.5%, and any value within the range of any two of the above values.

[0033] The mass percentage of ascorbic acid and / or ascorbate in the acrylic pressure-sensitive adhesive cleaner is 2.3% to 2.8%, for example, 2.3%, 2.4%, 2.45%, 2.5%, 2.55%, 2.6%, 2.8%, and any value within the range of any two of the above values.

[0034] The mass percentage of glycol ether in the acrylic pressure-sensitive adhesive cleaner is 13% to 16.2%, for example, 13%, 14.7%, 14.9%, 15%, 15.4%, 15.9%, 16.2%, and any value within the range of any two of the above values.

[0035] The mass percentage of ferrous salt in acrylic pressure-sensitive adhesive cleaner is 0.75% to 0.9%, for example, 0.75%, 0.81%, 0.82%, 0.83%, 0.84%, 0.85%, 0.86%, 0.87%, 0.9%, and any value within the range of any two of the above values.

[0036] The organic acid content in the acrylic pressure-sensitive adhesive cleaner is 2% to 2.4% by mass, for example, 2%, 2.1%, 2.12%, 2.14%, 2.16%, 2.18%, 2.2%, 2.4%, and any value within the range of any two of the above values.

[0037] The mass percentage of oxidant in the acrylic pressure-sensitive adhesive cleaner is 4.5% to 5.8%, for example, 4.5%, 4.7%, 4.8%, 4.9%, 5.0%, 5.1%, 5.2%, 5.3%, 5.8%, and any value within the range of any two of the above values.

[0038] This application constructs a reaction system of ferrous salt / persulfate / ascorbic acid and / or ascorbate / oxidant / organic acid to ensure the continuous generation of sulfate and hydroxyl radicals during the cleaning process of acrylic pressure-sensitive adhesive cleaner, thereby efficiently and thoroughly decomposing the acrylic pressure-sensitive adhesive; specifically: under acidic conditions, the Fe in the ferrous salt 2+ It reacts with persulfate to generate sulfate radicals and Fe. 3+ Fe in ferrous salts 2+ It reacts with oxidants to generate hydroxyl radicals and Fe. 3+ Sulfate radicals and hydroxyl radicals attack the molecular chains of acrylic pressure-sensitive adhesives, achieving chemical decomposition; the Fe generated in the reaction 3+ It can be rapidly reduced to Fe by ascorbic acid and / or ascorbate. 2+ It is reused to activate persulfate to generate sulfate radicals and to activate oxidants to generate hydroxyl radicals, thereby realizing the catalytic cycle of iron ions and the continuous generation of sulfate radicals and hydroxyl radicals, thus efficiently and continuously decomposing acrylic pressure-sensitive adhesive residues.

[0039] The specific reaction mechanism is as follows: (1) Under suitable acidic conditions provided by organic acids, the ferrous ions (Fe) in the ferrous salt react to react with the organic acid. 2+ It acts as a catalyst, activating persulfate and oxidant to generate sulfate radicals and hydroxyl radicals, respectively, as shown in the following reaction formula:

[0040] Fe 2+ + S2O8 2- → Fe 3+ + SO4 - ·+ SO4 2- ;

[0041] Fe 2+ + H2O2 → Fe 3+ + ·OH + OH - .

[0042] The sulfate radicals generated in the reaction work synergistically with the hydroxyl radicals to attack the polymer chains of the acrylic pressure-sensitive adhesive through different mechanisms, initiating the breakage and oxidation of the polymer backbone through reactions such as hydrogen extraction, electron transfer, and addition.

[0043] (2) The iron ions (Fe) produced during the above reaction process 3+ ), can be rapidly reduced to ferrous ions (Fe) by ascorbic acid (C6H8O6) or ascorbate present in the system. 2+ For example: ascorbic acid reduces ferric ions (Fe). 3+ The reaction formula is as follows:

[0044] C6H8O6 + 2Fe 3+ → C6H6O6 (dehydroascorbic acid) + 2Fe 2+ + 2H + .

[0045] Regenerated ferrous ions (Fe 2+ It can be reused to activate persulfate and oxidizing agents, thereby achieving the ionization of iron (Fe). 2+ / Fe 3+ ) catalytic cycle.

[0046] Furthermore, the acrylic pressure-sensitive adhesive cleaner, by weight percentage, comprises 13.5%~15.2% persulfate, 2.4%~2.6% ascorbic acid and / or ascorbate salt, 14.7%~15.9% glycol ether, 0.81%~0.87% ferrous salt, 2.1%~2.2% organic acid, 4.7%~5.3% oxidant, with the balance being water.

[0047] It is understood that the mass percentage of persulfate in acrylic pressure-sensitive adhesive cleaner is 13.5% to 15.2%, for example, 13.5%, 14%, 14.5%, 15%, 15.2%, and any value within the range of any two of the above values.

[0048] The mass percentage of ascorbic acid and / or ascorbate in the acrylic pressure-sensitive adhesive cleaner is 2.4% to 2.6%, for example, 2.4%, 2.45%, 2.5%, 2.55%, 2.6%, and any value within the range of any two of the above values.

[0049] The mass percentage of glycol ether in the acrylic pressure-sensitive adhesive cleaner is 14.7% to 15.9%, for example, 14.7%, 14.9%, 15%, 15.4%, 15.9%, and any value within the range of any two of the above values.

[0050] The mass percentage of ferrous salt in acrylic pressure-sensitive adhesive cleaner is 0.81% to 0.87%, for example, 0.81%, 0.82%, 0.83%, 0.84%, 0.85%, 0.86%, 0.87%, and any value within the range of any two of the above values.

[0051] The organic acid in the acrylic pressure-sensitive adhesive cleaner is 2.1% to 2.2% by mass, for example, 2.1%, 2.12%, 2.14%, 2.16%, 2.18%, 2.2%, and any value within the range of any two of the above values.

[0052] The mass percentage of oxidant in the acrylic pressure-sensitive adhesive cleaner is 4.7% to 5.3%, for example, 4.7%, 4.8%, 4.9%, 5.0%, 5.1%, 5.2%, 5.3%, and any value within the range of any two of the above values.

[0053] In some embodiments, the persulfate includes at least one selected from ammonium persulfate, sodium persulfate, and potassium persulfate. Further, the persulfate is ammonium persulfate.

[0054] In some embodiments, ascorbate salts include at least one of sodium ascorbate and potassium ascorbate.

[0055] In some embodiments, the glycol ether includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, and ethylene glycol methyl ether. Further, the glycol ether is dipropylene glycol methyl ether.

[0056] In some embodiments, the ferrous salt includes at least one selected from ferrous sulfate, ferrous chloride, ferrous acetate, and ferrous oxalate. Further, the ferrous salt is ferrous sulfate.

[0057] In some embodiments, the organic acid includes at least one selected from citric acid, malic acid, and lactic acid. Further, the organic acid is citric acid.

[0058] By adding organic acids to the reaction system, a stable acidic environment is provided and maintained for the entire system, ensuring the free radical generation reaction to proceed. At the same time, the organic acids complex iron ions, preventing them from forming hydroxide precipitates, widening the effective pH range, maintaining catalytic activity, and synergistically promoting the recycling and regeneration of iron ions with ascorbic acid.

[0059] In some embodiments, the oxidant includes at least one of hydrogen peroxide and sodium perborate. Further, the oxidant is hydrogen peroxide.

[0060] In some embodiments, the pH value of the acrylic pressure-sensitive adhesive cleaner is 2.7 to 3.3, for example, 2.7, 3.05, 3.1, 3.15, 3.2, 3.3, and any value within the range of any two of the above values. Further, the pH value of the acrylic pressure-sensitive adhesive cleaner is 3.0 to 3.2. By controlling the pH value of the acrylic pressure-sensitive adhesive cleaner within the range of 2.7 to 3.3, on the one hand, the acidity of the reaction system is controlled within the optimal range for the generation kinetics of sulfate and hydroxyl radicals, promoting the generation of free radicals; on the other hand, it ensures that Fe... 3+ It is efficiently reduced in the reaction system, preventing the precipitation of iron ions.

[0061] In some embodiments, the surface tension of the acrylic pressure-sensitive adhesive cleaner is 26.5 dyn / cm to 29.2 dyn / cm, for example, 26.5 dyn / cm, 26.7 dyn / cm, 26.9 dyn / cm, 27.1 dyn / cm, 27.4 dyn / cm, 27.6 dyn / cm, 27.8 dyn / cm, and 29.2 dyn / cm. More specifically, the surface tension of the acrylic pressure-sensitive adhesive cleaner is 26.7 dyn / cm to 27.8 dyn / cm. By controlling the surface tension of the acrylic pressure-sensitive adhesive cleaner within the range of 26.5 dyn / cm to 29.2 dyn / cm, the wettability of the cleaner is improved, allowing it to spread rapidly upon contact with the acrylic pressure-sensitive adhesive layer, thus increasing the effective contact area between the cleaner and the adhesive. Simultaneously, the lower surface tension facilitates the cleaner's penetration into the surface cracks of the material to be cleaned through capillary action, achieving comprehensive contact with the adhesive layer and ultimately realizing efficient and thorough chemical decomposition, while also facilitating the peeling and removal of decomposition products.

[0062] In one specific embodiment, the acrylic pressure-sensitive adhesive cleaning agent, by mass percentage, comprises 13.5%~15.2% ammonium persulfate, 2.4%~2.6% ascorbic acid, 14.7%~15.9% dipropylene glycol methyl ether, 0.81%~0.87% ferrous sulfate, 2.1%~2.2% citric acid, 4.7%~5.3% hydrogen peroxide, with the balance being water.

[0063] like Figure 1 As shown, a second aspect of this application provides a method for preparing an acrylic pressure-sensitive adhesive cleaner, comprising the following steps:

[0064] S1. Prepare an acrylic pressure-sensitive adhesive cleaning agent by mixing persulfate, ascorbic acid and / or ascorbate salt, glycol ether, ferrous salt, organic acid, oxidant and water.

[0065] The mass percentages of each raw material are as follows: persulfate: 11%~15.5%, ascorbic acid and / or ascorbate salt: 2.3%~2.8%, glycol ether: 13%~16.2%, ferrous salt: 0.75%~0.9%; organic acid: 2%~2.4%, oxidant: 4.5%~5.8%, and the balance is water.

[0066] In some embodiments, the preparation method of the acrylic pressure-sensitive adhesive cleaning agent includes the following steps:

[0067] S10. Dissolve persulfate in water to prepare the first solution.

[0068] S20. Mix ascorbic acid and / or ascorbate salt with the first solution to prepare the second solution.

[0069] S30. Mix the ferrous salt with the second solution to prepare the third solution.

[0070] S40. Mix the oxidant, organic acid and the third solution to prepare the fourth solution.

[0071] S50. Mix the glycol ether with the fourth solution to prepare an acrylic pressure-sensitive adhesive cleaning agent.

[0072] In some embodiments, the acrylic pressure-sensitive adhesive cleaner provided in the first aspect of this application or the acrylic pressure-sensitive adhesive cleaner prepared by the preparation method of the acrylic pressure-sensitive adhesive cleaner provided in the second aspect of this application is used in the cleaning of electronic products.

[0073] Furthermore, this application provides the following specific embodiments and comparative examples to further illustrate the specific implementation of this application and its advantages.

[0074] The reagents used in the examples are shown in Table 1 below:

[0075] Table 1

[0076]

[0077] pH testing instrument: Youke KN-P911 benchtop high-precision pH meter. Surface tension testing instrument: Delit A1200 automatic interfacial tension meter.

[0078] Example 1

[0079] Dissolve 12% ammonium persulfate in water and stir until homogeneous. Then add 2.8% ascorbic acid and stir until homogeneous. Next, add 0.9% ferrous sulfate and stir until homogeneous. Then add 5.5% hydrogen peroxide and 2.2% citric acid and stir until homogeneous. Finally, add 14% dipropylene glycol methyl ether and stir until homogeneous to obtain acrylic pressure-sensitive adhesive cleaning agent.

[0080] Example 2

[0081] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 13.5% ammonium persulfate, 2.6% ascorbic acid, 14.5% dipropylene glycol methyl ether, 0.85% ferrous sulfate, 5.2% hydrogen peroxide, 2.1% citric acid, and the balance is water.

[0082] Example 3

[0083] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 11% ammonium persulfate, 2.7% ascorbic acid, 13% dipropylene glycol methyl ether, 0.75% ferrous sulfate, 4.8% hydrogen peroxide, 2.3% citric acid, and the balance is water.

[0084] Example 4

[0085] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 14.2% ammonium persulfate, 2.7% ascorbic acid, 15% dipropylene glycol methyl ether, 0.82% ferrous sulfate, 5% hydrogen peroxide, 2.4% citric acid, and the balance is water.

[0086] Example 5

[0087] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 12.5% ​​ammonium persulfate, 2.5% ascorbic acid, 14.2% dipropylene glycol methyl ether, 0.78% ferrous sulfate, 5.8% hydrogen peroxide, 2.1% citric acid, and the balance is water.

[0088] Example 6

[0089] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 15% ammonium persulfate, 2.4% ascorbic acid, 15.5% dipropylene glycol methyl ether, 0.85% ferrous sulfate, 4.5% hydrogen peroxide, 2.2% citric acid, and the balance is water.

[0090] Example 7

[0091] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 13% ammonium persulfate, 2.6% ascorbic acid, 14.3% dipropylene glycol methyl ether, 0.8% ferrous sulfate, 5.5% hydrogen peroxide, 2.3% citric acid, and the balance is water.

[0092] Example 8

[0093] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 14.8% ammonium persulfate, 2.5% ascorbic acid, 16% dipropylene glycol methyl ether, 0.88% ferrous sulfate, 5% hydrogen peroxide, 2% citric acid, and the balance is water.

[0094] Example 9

[0095] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 11.8% ammonium persulfate, 2.7% ascorbic acid, 13.5% dipropylene glycol methyl ether, 0.77% ferrous sulfate, 4.5% hydrogen peroxide, 2.4% citric acid, and the balance is water.

[0096] Example 10

[0097] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 15.5% ammonium persulfate, 2.3% ascorbic acid, 16.2% dipropylene glycol methyl ether, 0.9% ferrous sulfate, 4.8% hydrogen peroxide, 2.1% citric acid, and the balance is water.

[0098] Example 11

[0099] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 12.8% ammonium persulfate, 2.6% ascorbic acid, 14.8% dipropylene glycol methyl ether, 0.83% ferrous sulfate, 5.2% hydrogen peroxide, 2.2% citric acid, and the balance is water.

[0100] Example 12

[0101] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 14% ammonium persulfate, 2.5% ascorbic acid, 15.3% dipropylene glycol methyl ether, 0.82% ferrous sulfate, 5.5% hydrogen peroxide, 2.1% citric acid, and the balance is water.

[0102] Example 13

[0103] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 13.2% ammonium persulfate, 2.7% ascorbic acid, 14.6% dipropylene glycol methyl ether, 0.79% ferrous sulfate, 5% hydrogen peroxide, 2.3% citric acid, and the balance is water.

[0104] Example 14

[0105] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 15.2% ammonium persulfate, 2.4% ascorbic acid, 15.8% dipropylene glycol methyl ether, 0.86% ferrous sulfate, 4.8% hydrogen peroxide, 2.1% citric acid, and the balance is water.

[0106] Example 15

[0107] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 14.5% ammonium persulfate, 2.5% ascorbic acid, 15.6% dipropylene glycol methyl ether, 0.84% ​​ferrous sulfate, 5.3% hydrogen peroxide, 2.2% citric acid, and the balance is water.

[0108] Example 16

[0109] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 13.5% ammonium persulfate, 2.6% ascorbic acid, 14.7% dipropylene glycol methyl ether, 0.81% ferrous sulfate, 5.1% hydrogen peroxide, 2.2% citric acid, and the balance is water.

[0110] Example 17

[0111] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 15.3% ammonium persulfate, 2.4% ascorbic acid, 15.9% dipropylene glycol methyl ether, 0.87% ferrous sulfate, 4.7% hydrogen peroxide, 2.1% citric acid, and the balance is water.

[0112] Example 18

[0113] The preparation method of the acrylic pressure-sensitive adhesive cleaning agent in this embodiment is basically the same as that in Example 1. The main difference is that the acrylic pressure-sensitive adhesive includes 14.2% ammonium persulfate, 2.5% ascorbic acid, 15.4% dipropylene glycol methyl ether, 0.83% ferrous sulfate, 5% hydrogen peroxide, 2.2% citric acid, and the balance is water.

[0114] The mass percentage details of each substance in Examples 1-18 are shown in Table 2 below.

[0115] Comparative Examples 1 to 18 were prepared by mixing potassium hydroxide, EDTA-2Na (disodium ethylenediaminetetraacetate), sodium metasilicate pentahydrate, sodium carbonate, sodium gluconate, and dodecylphenol polyoxyethylene OP-10 with water to create 18 sets of conventional alkaline cleaning agents. See Table 2 below for details.

[0116] Test case

[0117] The cleaning agents prepared in the examples and comparative examples were used to clean the casings of 3C electronic products with residual acrylic pressure-sensitive adhesive. 100 pieces were cleaned in each group, and the yield rate, pH value, and surface tension of the corresponding cleaning solution were recorded for each group. The same ultrasonic cleaning process parameters were used throughout the cleaning process: 50℃ / 5min, 40kHz ultrasonic frequency. The results are shown in Table 2 below.

[0118] Table 2

[0119]

[0120]

[0121]

[0122]

[0123] As shown in Table 2, compared with the use of traditional alkaline cleaning agents, the acrylic pressure-sensitive adhesive cleaning agent provided in this application significantly improves the cleaning yield of residual acrylic pressure-sensitive adhesive on the surface of 3C shells, with a cleaning yield of over 90%.

[0124] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An acrylic pressure-sensitive adhesive cleaning agent, characterized in that, It comprises, by mass percentage, 11%–15.5% persulfate, 2.3%–2.8% ascorbic acid and / or ascorbate salt, 13%–16.2% glycol ether, 0.75%–0.9% ferrous salt, 2%–2.4% organic acid, 4.5%–5.8% oxidizing agent, with the balance being water.

2. The acrylic pressure-sensitive adhesive cleaning agent according to claim 1, characterized in that, The persulfate includes at least one of ammonium persulfate, sodium persulfate, and potassium persulfate.

3. The acrylic pressure-sensitive adhesive cleaning agent according to claim 1, characterized in that, The ascorbate salt includes at least one of sodium ascorbate and potassium ascorbate.

4. The acrylic pressure-sensitive adhesive cleaning agent according to claim 1, characterized in that, The glycol ether includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, and ethylene glycol methyl ether.

5. The acrylic pressure-sensitive adhesive cleaning agent according to claim 1, characterized in that, The ferrous salt includes at least one of ferrous sulfate, ferrous chloride, ferrous acetate, and ferrous oxalate.

6. The acrylic pressure-sensitive adhesive cleaning agent according to claim 1, characterized in that, The organic acid includes at least one selected from citric acid, malic acid, and lactic acid; and / or, The oxidant includes at least one of hydrogen peroxide and sodium perborate.

7. The acrylic pressure-sensitive adhesive cleaning agent according to any one of claims 1-6, characterized in that, The pH value of the acrylic pressure-sensitive adhesive cleaning agent is 2.7~3.

3.

8. The acrylic pressure-sensitive adhesive cleaning agent according to any one of claims 1-6, characterized in that, The surface tension of the acrylic pressure-sensitive adhesive cleaning agent is 26.5 dyn / cm to 29.2 dyn / cm.

9. A method for preparing an acrylic pressure-sensitive adhesive cleaning agent, characterized in that, Includes the following steps: The acrylic pressure-sensitive adhesive cleaning agent is prepared by mixing persulfate, ascorbic acid and / or ascorbate salt, glycol ether, ferrous salt, organic acid, oxidant and water. The mass percentages of each raw material are as follows: persulfate: 11%~15.5%, ascorbic acid and / or ascorbate salt: 2.3%~2.8%, glycol ether: 13%~16.2%, ferrous salt: 0.75%~0.9%; Organic acids: 2%~2.4%, oxidizing agents: 4.5%~5.8%, balance is water.

10. The application of an acrylic pressure-sensitive adhesive cleaner according to any one of claims 1-8 or an acrylic pressure-sensitive adhesive cleaner prepared by the preparation method of claim 9 in the cleaning of electronic products.

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