Thermosensitive paper eraser and method for preparing the same

Abstract

The present application relates to a kind of thermal paper trace elimination liquid and its preparation method, the thermal paper trace elimination liquid by ketone solvent and propylene carbonate and diethylene glycol monomethyl ether are reasonably matched, and by controlling the proportion of each component makes the trace elimination speed on thermal paper fast, trace elimination is complete and can be quickly dried, and the irritability to human skin, respiratory tract is lower, and it is friendly to environment.

Description

Technical Field

[0001] This invention relates to the field of chemical technology, and in particular to a thermal paper ink erasing liquid and its preparation method. Background Technology

[0002] With the rapid development of modern information science and technology, the popularization of the Internet, and the continuous improvement of information digitization, a new business operation model that uses the Internet as a medium for the production, distribution, sale, or payment of goods and services has emerged, namely e-commerce. Among them, online shopping has flourished due to its convenience and speed.

[0003] As a crucial part of online shopping, express delivery relies heavily on information transmission. Typically, a shipping label is affixed to the product, containing the sender's and recipient's names, phone numbers, addresses, and a barcode for data entry during transit. The courier then delivers the goods to the consumer based on the information on the label. However, most people discard the outer packaging after receiving the goods, unaware of the sensitive information on the label, such as names, phone numbers, and addresses. This significantly increases the risk of personal information leaks, leading to unwanted calls from unknown numbers, including harassing, sales, and even scam calls.

[0004] The material commonly used in the market for express delivery slips is mainly thermal paper. There are generally two methods to remove the writing on thermal paper: one is a physical method, which includes tearing it by hand, scratching it with a knife or sharp object, or repeatedly applying it with a marker. This method has the problems of being easy to get injured, the torn or scratched pieces being easy to piece back together, and being time-consuming and laborious. The other is a chemical method, which includes burning the thermal paper with a lighter to carbonize and turn it black, and applying chemical reagents to dissolve the dye on the thermal paper and make the writing on the express delivery slip disappear. Commonly used reagents include essential oils, toilet water, and writing removal liquids. This method has the problems of being inconvenient to use, easy to get burned, poor writing removal effect, and long drying time.

[0005] In addition, most thermal paper ink erasers on the market are difficult to evaporate and are highly irritating to human skin and respiratory tract. Summary of the Invention

[0006] Therefore, it is necessary to provide a thermal paper ink removal liquid that uses a low proportion of ether solvents and environmentally friendly solvents with low irritation to the human body, which can quickly remove ink on thermal paper and dry it quickly.

[0007] In a first aspect, the present invention provides a thermal paper ink erasing liquid, the raw materials of which include a ketone solvent, propylene carbonate and diethylene glycol monomethyl ether in a mass ratio of (10~25):(15~35):(15~35).

[0008] In some embodiments, the ketone solvent is selected from one or more of acetone, methyl ketone, ethyl ketone, butanone, hexanone, and benzophenone.

[0009] In some embodiments, the thermal paper ink erasing liquid is formulated as an aerosol.

[0010] In some embodiments, the thermal paper ink erasing liquid further includes an alcohol solvent and a propellant.

[0011] In some embodiments, the raw materials of the thermal paper ink erasing liquid include the following components by weight percentage:

[0012] Ketone solvents 10%-25%;

[0013] Propylene carbonate 15%-35%;

[0014] Diethylene glycol monomethyl ether 15%-35%;

[0015] Alcohol solvents: 10%-20%;

[0016] Propellant content: 15%-30%.

[0017] In some embodiments, the alcohol solvent is selected from one or more of methanol, ethanol, isopropanol, and isobutanol.

[0018] In some embodiments, the propellant is selected from one or more of propane, butane, trichlorofluoromethane, difluoromethane, and trichlorotetrafluoroethane.

[0019] In some embodiments, the raw materials of the thermal paper ink erasing liquid include the following components by weight percentage:

[0020] Acetone 10%-25%;

[0021] Propylene carbonate 15%-35%;

[0022] Diethylene glycol monomethyl ether 15%-35%;

[0023] 10%-20% ethanol;

[0024] Propellant content: 15%-30%.

[0025] A second aspect of the present invention provides a method for preparing a thermal paper ink erasing liquid, comprising the following steps:

[0026] The ketone solvent, propylene carbonate, diethylene glycol monomethyl ether, and alcohol solvent are mixed and stirred to prepare a mixture.

[0027] The mixture is combined with the propellant to prepare a thermal paper ink erasing solution.

[0028] In some embodiments, the stirring rate is 300 r / min-700 r / min.

[0029] In some of these embodiments, the stirring time is 3 min to 5 min.

[0030] In some of these embodiments, the stirring temperature is room temperature.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The thermal paper ink removal solution provided by this invention rationally combines ketone solvents with propylene carbonate and diethylene glycol monomethyl ether, and by adjusting the proportion of each component, the ink removal speed on thermal paper is fast, the ink removal is thorough, and it can dry quickly. It also has low irritation to human skin and respiratory tract and is environmentally friendly. Detailed Implementation

[0033] The following detailed description, in conjunction with specific embodiments, further illustrates the thermal paper ink erasing liquid and its preparation method of the present invention. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0034] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described in detail below. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0036] the term

[0037] Unless otherwise stated or in case of contradiction, the terms or phrases used herein shall have the following meanings:

[0038] In this article, "one or more" refers to any one, two or more of the listed items.

[0039] In this document, the optional range of "and / or", "or / and", and "and / or" includes any one of two or more of the related listed items, as well as any and all combinations of the related listed items, including any two related listed items, any more related listed items, or a combination of all the related listed items.

[0040] In this document, terms such as "further," "even more," and "particularly" are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of this invention.

[0041] In this document, terms such as "first aspect," "second aspect," "third aspect," and "fourth aspect" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly specifying the importance or quantity of the indicated technical features. Furthermore, "first," "second," "third," and "fourth" serve only as a non-exhaustive enumeration and should be understood as not constituting a closed limitation on quantity. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. In the description of the present invention, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0042] In this invention, numerical ranges are involved. Unless otherwise specified, the numerical ranges are considered continuous 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 features or characteristics, 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 included.

[0043] Unless otherwise specified, the percentage content involved in this invention refers to mass percentage for solid-liquid mixtures and solid-phase-solid mixtures, and volume percentage for liquid-phase-liquid mixtures.

[0044] Unless otherwise specified, all percentage concentrations mentioned in this invention refer to the final concentration. The final concentration refers to the proportion of the added component in the system after the addition of that component.

[0045] Unless otherwise specified, the temperature parameters in this invention allow for both isothermal processing and processing within a certain temperature range. The isothermal processing allows temperature fluctuations within the precision range controlled by the instrument. Fluctuations are permitted within ranges such as ±5 °C, ±2 °C, ±1 °C, ±0.5 °C, ±0.4 °C, ±0.3 °C, ±0.2 °C, and ±0.1 °C. In this invention, "room temperature" refers to the absence of temperature control operations, generally 4 °C to 35 °C, preferably 20 ± 5 °C.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specification. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] In this invention, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0048] The most common material used for express delivery slips is thermal paper. The color development of thermal paper relies on a chemical reaction between colorless dyes and a developer to produce color, which is then received by the printer to display text or images. Thermal paper typically consists of three layers: a paper base, a thermal coating, and a protective layer. The thermal coating or protective layer is the main factor affecting the quality of thermal paper. Commonly used colorless dyes in thermal paper include: crystal violet lactone (CVL) of the triphenylmethane phthalide system, fluorane systems, colorless benzoylmethylene blue (BLMB), or spiropyran systems. Commonly used developer agents in thermal paper include: p-hydroxybenzoic acid and its esters (PHBB, PHB, etc.), salicylic acid, 2,4-dihydroxybenzoic acid, or aromatic sulfones. Generally, the principle behind thermal paper ink removal liquid is to damage the protective layer of the thermal paper, and then use the solvent to dissolve the dye on the thermal paper, causing the ink to disappear.

[0049] When designing a thermal paper ink erasing solution, the properties of the solvent must first be evaluated to select a suitable solvent. The ratio of the solvent to other components must be adjusted and rationally formulated. Finally, the thermal paper ink erasing solution is prepared using a simple method. Currently, commonly used dye solvents on the market mainly fall into several categories: alcohols, ethers, esters, ketones, hydrocarbons and chlorinated hydrocarbons, benzenes, as well as oils, fats, and waxes. This application, based on propylene carbonate and diethylene glycol monobutyl ether, incorporates ketone solvents. Ketone solvents possess extremely strong solubility, which facilitates the rapid and thorough removal of ink. Simultaneously, they can adjust the overall volatility of the thermal paper ink erasing solution, increasing its fast drying speed and minimizing residue.

[0050] In a first aspect, the present invention provides a thermal paper ink erasing liquid, the raw materials of which include a ketone solvent, propylene carbonate and diethylene glycol monomethyl ether in a mass ratio of (10-25):(15-35):(15-35).

[0051] In one specific example, the raw materials of the thermal paper ink erasing liquid include ketone solvents, propylene carbonate, and diethylene glycol monomethyl ether in a mass ratio of (10-25):(15-25):(20-35).

[0052] In one specific example, the ketone solvent is selected from one or more of acetone, methyl ketone, ethyl ketone, butanone, hexanone, and benzophenone.

[0053] Furthermore, currently available thermal paper ink erasing liquids include spray-on and smear-on products. From a convenience standpoint, most commercially available thermal paper ink erasing liquids emphasize tightening the cap or locking the nozzle after use to prevent liquid evaporation and leakage, which is not very user-friendly. Therefore, this application further specifies the formulation of the thermal paper ink erasing liquid as an aerosol. Without limitation, the formulation of the thermal paper ink erasing liquid can also be other forms, such as traditional solvent-based products.

[0054] In one specific example, the thermal paper ink erasing liquid is formulated as an aerosol. More specifically, the thermal paper ink erasing liquid, when packaged as an aerosol, has atomizing properties, which not only allows for even spraying on the waybill without requiring multiple coats and wasting liquid, making it more economical and efficient, but also solves the problems of easy volatilization and leakage associated with traditional packaging, making it more convenient to use.

[0055] Furthermore, due to the compatibility issues between other solvents and the propellant in aerosol-type thermal paper ink erasing solutions, alcohol solvents need to be added as co-solvents to adjust the solubility of the propellant in the system. In one specific example, the components of the thermal paper ink erasing solution also include alcohol solvents and propellants.

[0056] In one specific example, the raw materials of the thermal paper ink erasing liquid include the following components by mass percentage:

[0057] Ketone solvents 10%-25%;

[0058] Propylene carbonate 15%-35%;

[0059] Diethylene glycol monomethyl ether 15%-35%;

[0060] Alcohol solvents: 10%-20%;

[0061] Propellant content: 15%-30%.

[0062] Understandably, the mass percentage of the ketone solvents includes, but is not limited to: 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%; the mass percentage of propylene carbonate includes, but is not limited to: 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%; and the mass percentage of diethylene glycol monomethyl ether includes, but is not limited to: 15%, 16%, 1 ... 7%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%; the mass percentage of the alcohol solvent includes, but is not limited to: 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%; the mass percentage of the propellant includes, but is not limited to: 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%.

[0063] In one specific example, the alcohol solvent is selected from one or more of methanol, ethanol, isopropanol, and isobutanol.

[0064] In one specific example, the propellant is selected from one or more of propane, butane, trichlorofluoromethane, difluoromethane, and trichlorotetrafluoroethane.

[0065] In one specific example, the raw materials of the thermal paper ink erasing liquid include the following components by mass percentage:

[0066] Acetone 10%-25%;

[0067] Propylene carbonate 15%-35%;

[0068] Diethylene glycol monomethyl ether 15%-35%;

[0069] 10%-20% ethanol;

[0070] Propellant content: 15%-30%.

[0071] A second aspect of the present invention provides a method for preparing a thermal paper ink erasing liquid, comprising the following steps:

[0072] The ketone solvent, propylene carbonate, diethylene glycol monomethyl ether, and alcohol solvent are mixed and stirred to prepare a mixture.

[0073] The mixture is combined with the propellant to prepare a thermal paper ink erasing solution.

[0074] In one specific example, the stirring rate was 300 r / min-700 r / min. Understandably, the stirring rates include, but are not limited to: 300 r / min, 310 r / min, 320 r / min, 330 r / min, 340 r / min, 350 r / min, 360 r / min, 370 r / min, 380 r / min, 390 r / min, 400 r / min, 410 r / min, 420 r / min, 430 r / min, 440 r / min, 450 r / min, 460 r / min, 470 r / min, 480 r / min, 490 r / min, 500 r / min, 510 r / min, 520 r / min, 530 r / min, 540 r / min, 550 r / min, 560 r / min, 570 r / min, 580 r / min, 590 r / min, 600 r / min, 610 r / min, 620 r / min, 630 r / min. r / min, 640 r / min, 650 r / min, 660 r / min, 670 r / min, 680 r / min, 690 r / min, 700 r / min.

[0075] In one specific example, the stirring time is 3 min-5 min. It will be understood that the stirring time includes, but is not limited to: 3 min, 3.1 min, 3.2 min, 3.3 min, 3.4 min, 3.5 min, 3.6 min, 3.7 min, 3.8 min, 3.9 min, 4 min, 4.1 min, 4.2 min, 4.3 min, 4.4 min, 4.5 min, 4.6 min, 4.7 min, 4.8 min, 4.9 min, and 5 min.

[0076] In one specific example, the stirring temperature is room temperature. It will be understood that the stirring temperature includes, but is not limited to, 4 °C, 5 °C, 6 °C, 7 °C, 8 °C, 9 °C, 10 °C, 11 °C, 12 °C, 13 °C, 14 °C, 15 °C, 16 °C, 17 °C, 18 °C, 19 °C, 20 °C, 21 °C, 22 °C, 23 °C, 24 °C, 25 °C, 26 °C, 27 °C, 28 °C, 29 °C, 30 °C, 31 °C, 32 °C, 33 °C, 34 °C, and 35 °C.

[0077] A third aspect of the present invention provides a liquid for erasing express delivery slip information, comprising the thermal paper ink erasing liquid described above. Without limitation, the thermal paper may include, for example, express delivery slips.

[0078] The following detailed description is provided in conjunction with specific embodiments. Unless otherwise specified, all raw materials used in the following embodiments are commercially available; all instruments used are commercially available; and all processes involved are conventionally selected by those skilled in the art unless otherwise specified.

[0079] Example 1

[0080] A mixed solution was prepared by adding 25% propylene carbonate, 20% diethylene glycol monobutyl ether, and 15% anhydrous ethanol to 20% acetone and stirring at 500 r / min for 3 min at room temperature.

[0081] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, butane with a mass percentage of 20% was added, and a spray cap was installed to prepare an aerosol-type thermal paper ink erasing liquid.

[0082] Example 2

[0083] A mixed solution was prepared by adding 20% ​​propylene carbonate, 20% diethylene glycol monobutyl ether, and 15% anhydrous ethanol to 15% acetone and stirring at 500 r / min for 3 min at room temperature.

[0084] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, butane with a mass percentage of 30% was added, and a spray cap was installed to prepare a thermal paper ink erasing liquid.

[0085] Example 3

[0086] A mixed solution was prepared by adding 35% propylene carbonate, 20% diethylene glycol monobutyl ether, and 10% anhydrous ethanol to 15% acetone and stirring at 500 r / min for 3 min at room temperature.

[0087] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, and a mixture of propane and butane with a mass percentage of 20% (propane:butane = 3:7) was filled in. The spray cap was then installed to prepare the thermal paper ink removal liquid.

[0088] Example 4

[0089] A mixed solution was prepared by adding 15% propylene carbonate, 35% diethylene glycol monobutyl ether, and 10% anhydrous ethanol to 20% acetone and stirring at 500 r / min for 3 min at room temperature.

[0090] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, butane with a mass percentage of 20% was added, and a spray cap was installed to prepare a thermal paper ink erasing liquid.

[0091] Comparative Example 1

[0092] The preparation method of Comparative Example 1 is basically the same as that of Example 1, except that the mass percentage of propylene carbonate is increased.

[0093] A mixed solution was prepared by adding 45% propylene carbonate, 10% diethylene glycol monobutyl ether, and 10% anhydrous ethanol to 15% acetone and stirring at 500 r / min for 3 min at room temperature.

[0094] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, butane with a mass percentage of 20% was added, and a spray cap was installed to prepare a thermal paper ink erasing liquid.

[0095] Comparative Example 2

[0096] The preparation method of Comparative Example 1 is basically the same as that of Example 1, except that the mass percentage of acetone is increased.

[0097] A mixed solution was prepared by adding 15% propylene carbonate, 10% diethylene glycol monobutyl ether, and 10% anhydrous ethanol to 45% acetone and stirring at 500 r / min for 3 min at room temperature.

[0098] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, butane with a mass percentage of 20% was added, and a spray cap was installed to prepare a thermal paper ink erasing liquid.

[0099] Comparative Example 3

[0100] The preparation method of Comparative Example 3 is basically the same as that of Example 1, except that the alcohol solvent and ketone solvent are omitted.

[0101] The specific synthesis steps are as follows: 50% propylene carbonate and 30% diethylene glycol monobutyl ether are mixed and stirred at 500 r / min for 3 min at room temperature to prepare a mixed solution; the above mixed solution is put into a tin can, a valve is inserted and the can is sealed, and a mixture of 20% propane and butane (propane:butane = 3:7) is filled in, and a spray cap is installed to prepare a thermal paper ink erasing liquid.

[0102] Comparative Example 4

[0103] The preparation method of Comparative Example 4 is basically the same as that of Example 1, except that dimethyl ether is used in place of propane or butane at a mass percentage.

[0104] The specific synthesis steps are as follows: 50% by mass of propylene carbonate and 30% by mass of diethylene glycol monobutyl ether are mixed and stirred at a stirring rate of 500 r / min for 3 min at room temperature to prepare a mixed solution.

[0105] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, and 20% dimethyl ether was added. The spray cap was then installed to prepare the thermal paper ink removal liquid.

[0106] Comparative Example 5

[0107] The preparation method of Comparative Example 5 is basically the same as that of Example 1, except that the ketone solvent is omitted.

[0108] The specific synthesis steps are as follows: 25% propylene carbonate, 25% diethylene glycol monobutyl ether, and 20% anhydrous ethanol are mixed and stirred at 500 r / min for 3 min at room temperature to prepare a mixed solution.

[0109] The above mixed solution was placed into a tin can, a valve was inserted and the can was sealed, butane with a mass percentage of 30% was added, and a spray cap was installed to prepare a thermal paper ink erasing liquid.

[0110] The process parameters (in mass percentage) of each component in the preparation methods of Examples 1-4 and Comparative Examples 1-5 are listed in Table 1:

[0111] Table 1

[0112]

[0113] The thermal paper ink removal liquid prepared in Examples 1-4 and Comparative Examples 1-5 was used as follows: the thermal paper ink removal liquid was aimed at the surface of the thermal paper, the nozzle was pressed at a distance of about 10 cm-15 cm from the surface, the express delivery slip was sprayed evenly, and after a period of time, the ink was removed.

[0114] Technical Specifications Testing:

[0115] The technical indicators of the thermal paper ink erasing liquid prepared in Example 1 were tested, and the test results are shown in Table 2 below.

[0116] Table 2

[0117]

[0118] Performance testing:

[0119] The thermal paper ink erasing liquids prepared in Examples 1-6 and Comparative Examples 1-3 were tested for their effectiveness. The test results are shown in Table 3 below.

[0120] (1) Propellant compatibility test

[0121] The specific experimental steps are as follows: Take a special transparent glass bottle for aerosol testing, prepare thermal paper ink removal liquid according to the formulas of Examples 1-6 and Comparative Examples 1-3 respectively, let it stand for 24 hours to observe the propellant compatibility, check whether there is a layering and immiscibility phenomenon between the liquid and the gas, and test the spray state of the thermal paper ink removal liquid.

[0122] (2) Handwriting removal effect test

[0123] The specific experimental steps are as follows: Take several SF Express waybills, aim the thermal paper ink removal liquid at the surface of the waybill, spray it evenly at a distance of 10 cm-15 cm from the surface, press the stopwatch to start the time, repeat three times, and take the average of the three test times as the ink removal time.

[0124] (3) Stimulation test

[0125] The specific experimental steps are as follows: spray the thermal paper ink removal liquid evenly at a distance of 10 cm-15 cm from the thermal paper, and then at a distance of 30 cm from the human body, use your right hand to continuously fan the ink into your nose and evaluate the irritation of each sample.

[0126] (4) Drying time test

[0127] The specific experimental steps are as follows: Spray 2 g-2.5 g of thermal paper ink removal liquid evenly onto the smooth surface of the express delivery slip, start the stopwatch, and record the time after the thermal paper ink removal liquid has completely evaporated. Repeat three times and take the average of the three test times as the drying time of the thermal paper ink removal liquid.

[0128] Table 3

[0129]

[0130] In summary, the composition of each component in thermal paper ink removal solution should be properly controlled to ensure fast and thorough ink removal on thermal paper, rapid drying, and significant ink removal effect, while minimizing irritation to human skin and respiratory tract.

[0131] 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.

[0132] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A thermal paper ink erasing liquid, characterized in that, Its raw materials include ketone solvents, propylene carbonate and diethylene glycol monomethyl ether in a mass ratio of (10-25):(15-25):(20-35); The thermal paper ink removal liquid is in the form of an aerosol. The raw materials of the thermal paper ink erasing liquid, by weight percentage, consist of the following components: Ketone solvents 20%; Propylene carbonate 15%-35%; Diethylene glycol monomethyl ether 15%-35%; Alcohol solvents: 10%-20%; Propellant 20%; The alcohol solvent is selected from one or more of methanol, ethanol, isopropanol, and isobutanol; The propellant is butane.

2. The thermal paper ink erasing liquid according to claim 1, characterized in that, The ketone solvent is selected from one or more of acetone, methyl ketone, ethyl ketone, butanone, hexanone, and benzophenone.

3. The thermal paper ink erasing liquid according to claim 1, characterized in that, Its raw materials, by mass percentage, consist of the following components: Ketone solvents 20%; Propylene carbonate 15%-35%; Diethylene glycol monomethyl ether 15%-35%; Alcohol solvents: 10%-20%; Propellant 20%; The ketone solvent is acetone; The alcohol solvent is ethanol.

4. The method for preparing the thermal paper ink erasing liquid according to claim 1 or 3, characterized in that, Includes the following steps: The ketone solvent, propylene carbonate, diethylene glycol monomethyl ether, and alcohol solvent are mixed and stirred to prepare a mixture. The mixture is combined with the propellant to prepare a thermal paper ink erasing solution.

5. The method for preparing the thermal paper ink erasing liquid according to claim 4, characterized in that, The stirring rate is 300 r / min-700 r / min; the stirring time is 3 min-5 min; and the stirring temperature is room temperature.

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