A self-adhesive repair label and its preparation method

Abstract

This application relates to the field of self-adhesive label technology, specifically disclosing a self-adhesive repair label and its preparation method. A self-adhesive repair label includes a face material layer, an adhesive layer, and a release paper backing layer arranged sequentially. The adhesive layer is made from raw materials comprising the following parts by weight: 40-60 parts acrylic resin emulsion; 8-10 parts liquid rosin resin; 5-8 parts modified starch; 4-7 parts functional powder; 30-40 parts ethyl acetate diluent; 15-25 parts adhesive; and 5-10 parts processing aids. The preparation method is as follows: the acrylic resin emulsion, liquid rosin resin, modified starch, functional powder, ethyl acetate diluent, adhesive, and processing aids are mixed evenly to obtain the adhesive; the adhesive is coated onto the bonding surface of the face material, baked in an oven, and after cooling, the release paper is pressed onto the bonding surface of the face material. After die-cutting, the self-adhesive repair label is obtained. The self-adhesive repair label of this application exhibits excellent stability when used in environments with severe temperature changes.

Description

Technical Field

[0001] This application relates to the field of self-adhesive label technology, and more specifically, to a self-adhesive repair label and its preparation method. Background Technology

[0002] Self-adhesive labels have advantages over traditional labels, such as no need for glue, paste, or water, no pollution, and saving labeling time. They are composite materials with paper, film or other special materials as the face stock, adhesive on the back, and silicone-coated release paper as the backing paper. They are widely used in daily chemical, pharmaceutical, electronics, supermarket and logistics industries.

[0003] With the continuous upgrading of application environments, some high-altitude areas experience high daytime temperatures and low nighttime temperatures, resulting in a large temperature variation range and rapid temperature change rate within 24 hours. This necessitates that self-adhesive labels possess strong temperature resistance to ensure stable application performance. Currently, a common approach involves adding functional powders such as sodium silicate, aluminum nitride, aluminum hydronitride, asbestos, magnesium oxide, and zinc oxide to resin, along with various processing aids, to create an adhesive with good temperature resistance. This adhesive is then used in the preparation of self-adhesive labels, resulting in labels with excellent temperature resistance.

[0004] Regarding the aforementioned technologies, the inventors believe that the stability of self-adhesive labels in environments with severe temperature changes is closely related to the bonding between the resin and functional powder. Temperature changes inevitably weaken the interfacial bonding strength between the resin and functional powder, leading to stress fatigue damage and affecting the stable performance of temperature change resistance. Therefore, although the above-mentioned technical solutions show improved temperature change resistance on a macroscopic level, there are still defects in the microscopic bonding of the materials, which need further improvement. Currently, there is an urgent need to propose a solution to solve the above-mentioned technical problems. Summary of the Invention

[0005] In order to improve the stability of the interfacial bonding strength between resin and functional powder in a drastic temperature change environment and ensure the stable performance of temperature change resistance, this application provides a self-adhesive repair label and its preparation method.

[0006] Firstly, this application provides a self-adhesive repair label, employing the following technical solution:

[0007] A self-adhesive repair label includes a face layer, an adhesive layer, and a release paper backing layer arranged sequentially, wherein the adhesive layer is made of raw materials comprising the following parts by weight:

[0008] 40-60 parts of acrylic resin emulsion;

[0009] 8-10 parts of liquid rosin resin;

[0010] 5-8 parts of modified starch;

[0011] 4-7 parts of functional powder;

[0012] 30-40 parts of ethyl acetate diluent;

[0013] 15-25 parts adhesive;

[0014] 5-10 parts of processing aids.

[0015] By adopting the above technical solution, a relatively stable resin mixture system can be formed between the acrylic resin emulsion and the liquid rosin resin, which is beneficial for other component raw materials to play a full role in the mixture system. Among them, this application uses modified starch to improve the interfacial bonding strength between the functional powder and the resin mixture system. Because starch molecules contain a large number of alcohol hydroxyl groups, after modification, the alcohol hydroxyl groups become highly polar aldehyde groups, hydroxyl groups, acyl groups, etc., which can be well adsorbed on the surface of the functional powder, thereby playing a good modifying role for the functional powder. At the same time, the modified starch can be dispersed and penetrated in the resin mixture system formed by the acrylic resin emulsion and the liquid rosin resin. In this way, the functional powder can be stably bonded with the special resin mixture system formed by the acrylic resin emulsion and the liquid rosin resin with the assistance of modified starch. The interfacial bonding strength is greatly improved and the stability is more excellent. It is not easily damaged even in the environment of severe temperature change, thereby greatly improving the temperature change resistance of the self-adhesive repair label and making the overall applicability stronger.

[0016] Preferably, the modified starch is composed of hydroxyalkyl starch and phosphate starch, and the weight ratio of hydroxyalkyl starch to phosphate starch is 1:(1.6-2.8).

[0017] By adopting the above technical solutions, hydroxyalkyl starch exhibits excellent low-temperature stability and good film-forming properties, enabling modified starch to achieve a superior modification effect on the surface of functional powders. Phosphate starch has a good reinforcing effect and possesses certain heat resistance and stability, allowing modified starch to function stably during application. Furthermore, when hydroxyalkyl starch and phosphate starch are combined in a specific weight ratio to form modified starch, they exhibit excellent synergistic effects, especially in resin mixtures formed by acrylic resin emulsions and liquid rosin resins, where dispersion and penetration are particularly prominent. This significantly improves the interfacial bonding stability between functional powders and resins, resulting in superior temperature resistance for the obtained self-adhesive repair labels.

[0018] Preferably, the weight ratio of the hydroxyalkyl starch to the phosphate starch is 1:2.

[0019] By adopting the above technical solution, the hydroxyalkyl starch and phosphate starch in the above weight ratio exhibit excellent synergistic effects when applied, resulting in superior stability of the interfacial bonding performance between the resin and functional powder in environments with severe temperature changes.

[0020] Preferably, the functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder, and the weight ratio of aluminum nitride ceramic powder to silicon oxide ceramic powder is (3-8):1.

[0021] By employing the above technical solutions, both aluminum nitride ceramic powder and silica ceramic powder can enable the adhesive layer to exhibit excellent temperature resistance. Ceramic powder is chosen because its unique microporous structure facilitates the deep action of modified starch on its surface, thereby forming a strong and stable interfacial bond between the resin and the functional powder. Simultaneously, the aforementioned weight ratio of aluminum nitride ceramic powder and silica ceramic powder, when applied, can form a relatively three-dimensional mixed system within the adhesive layer, exhibiting superior overall temperature resistance. Therefore, the selection of these functional powders results in self-adhesive repair labels with excellent temperature resistance.

[0022] Preferably, the weight ratio of the aluminum nitride ceramic powder to the silicon oxide ceramic powder is 5:1.

[0023] By adopting the above technical solution, the aluminum nitride ceramic powder and silicon oxide ceramic powder in the above weight ratio have a better and more stable effect in combination, so that the obtained self-adhesive repair label can maintain excellent stability in a drastic temperature change environment.

[0024] Preferably, the adhesive layer also contains 2.5-4.5 parts by weight of a stabilizing agent, which is composed of water-soluble polyimide and silane coupling agent, and the weight ratio of water-soluble polyimide to silane coupling agent is (6-15):1.

[0025] By adopting the above technical solution, water-soluble polyimide exhibits excellent high-temperature resistance and superior mechanical properties. It can enhance the temperature change resistance of acrylic resin emulsion and liquid rosin resin mixtures. Meanwhile, the silane coupling agent can perform one-step modification on the surface of the functional powder, not only improving the interfacial bonding strength between the functional powder and the resin mixture but also enabling the water-soluble polyimide to promote and reinforce the interfacial bonding between the powder and resin mixture. This results in a synergistic effect between the silane coupling agent and the water-soluble polyimide. Thus, by using a stabilizing agent composed of water-soluble polyimide and silane coupling agent in a specific ratio, the temperature change resistance of the adhesive layer can be further improved, resulting in superior stability of the subsequently obtained self-adhesive repair labels when used in environments with severe temperature changes.

[0026] Preferably, the weight ratio of the water-soluble polyimide to the silane coupling agent is 9:1.

[0027] By adopting the above technical solution, the water-soluble polyimide and silane coupling agent in the above weight ratio can play a relatively stable and excellent combination effect during application, and significantly improve the temperature change resistance of self-adhesive repair labels in environments with severe temperature changes.

[0028] Preferably, the adhesive is a combination of one or more of polyvinyl alcohol, hydroxyethyl cellulose and sodium silicate.

[0029] By adopting the above technical solutions, the above-mentioned adhesives have good compatibility with other component raw materials and can all play a stable role, and assist the resin to make the adhesive layer exhibit excellent bonding performance during application.

[0030] Preferably, the processing aid is one or a combination of several of the following: flame retardant, antioxidant, leveling agent and thickener.

[0031] By adopting the above technical solutions, the above-mentioned processing aids can be evenly dispersed among the component raw materials during application and play an excellent role, thereby improving the overall performance of the adhesive layer and making the final self-adhesive repair labels more widely applicable.

[0032] Secondly, this application provides a method for preparing a self-adhesive repair label, which adopts the following technical solution:

[0033] A method for preparing a self-adhesive repair label includes the following steps:

[0034] (1) Prepare raw materials containing acrylic resin emulsion, liquid rosin resin, modified starch, functional powder, ethyl acetate diluent, adhesive and processing aid according to the formula;

[0035] (2) Put the acrylic resin emulsion, liquid rosin resin, modified starch, functional powder, ethyl acetate diluent, adhesive and processing aid from step (1) into a container, stir and mix evenly to obtain an adhesive.

[0036] (3) Apply the adhesive from step (2) to the bonding surface of the face material, bake it in an oven, and after cooling, press the release paper onto the bonding surface of the face material. After die-cutting, you can obtain a self-adhesive repair label with a structure consisting of a face material layer, an adhesive layer and a release paper base layer.

[0037] By adopting the above technical solution, the preparation steps of the self-adhesive repair label of this application are fewer, the process is simpler, and it is easy to carry out large-scale production. At the same time, the raw materials of each component in step (1) are mixed at one time in the above preparation, and the resulting adhesive can form an adhesive layer with excellent and stable performance in subsequent processing, indicating that the functional components are stably combined and effectively exerted in the preparation, and the overall application effect is outstanding.

[0038] In summary, this application has the following beneficial effects:

[0039] 1. This application uses acrylic resin emulsion and liquid rosin resin to form a special resin mixture system. Then, by using modified starch, the functional powder is effectively assisted in bonding with the resin mixture system, greatly improving the interfacial bonding strength and stability. As a result, the self-adhesive repair label has outstanding temperature resistance in environments with severe temperature changes.

[0040] 2. In this application, modified starch composed of hydroxyalkyl starch and phosphate starch in a specific ratio range is preferred, and functional powder composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a specific ratio range is preferred, so that the interfacial bonding between the resin mixture system and the functional powder can maintain better stability in the environment of drastic temperature change, thereby obtaining self-adhesive repair labels with better temperature change resistance.

[0041] 3. This application adds a stabilizing agent composed of water-soluble polyimide and silane coupling agent in a specific ratio range. The combination of silane coupling agent and water-soluble polyimide promotes and reinforces the interfacial bonding between the powder and resin mixture, greatly improving the resistance to temperature changes. This makes the self-adhesive repair labels exhibit better stability when used in environments with severe temperature changes. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the embodiments.

[0043] Unless otherwise specified, all raw materials used in the preparation examples and embodiments of this application are commercially available.

[0044] The acrylic resin emulsion was purchased from BASF's Joncryl HPD296 low-viscosity, high-performance acrylic resin emulsion solution.

[0045] The liquid rosin resin was purchased from Shandong Haoyao New Material Co., Ltd., model number HY-Y12;

[0046] Hydroxyalkyl starch and phosphate starch were both purchased from Shandong Zhenghong Biotechnology Co., Ltd.

[0047] Ethyl acetate diluent was purchased from Shandong Hengshuo Chemical Co., Ltd., CAS No. 141-78-6;

[0048] Aluminum nitride ceramic powder was purchased from Yumu (Ningbo) New Materials Co., Ltd., item number YM-ALN-4;

[0049] The silica ceramic powder was purchased from Shanghai Xiangtian Nanomaterials Co., Ltd. as XT-SiO2-10μm spherical silica ultrafine silica ceramic powder.

[0050] Water-soluble polyimide was purchased from Shanghai Jiadeer Chemical Technology Co., Ltd., with a purity of 50%.

[0051] The silane coupling agent is type KH550.

[0052] Example

[0053] Example 1

[0054] A self-adhesive repair label includes a face material layer, an adhesive layer, and a release paper backing layer arranged sequentially. The raw materials and their corresponding weights of the adhesive layer are shown in Table 1, and the label is prepared by the following steps:

[0055] (1) Prepare raw materials containing acrylic resin emulsion, liquid rosin resin, modified starch, functional powder, ethyl acetate diluent, adhesive and processing aid according to the formula;

[0056] (2) Put the acrylic resin emulsion, liquid rosin resin, modified starch, functional powder, ethyl acetate diluent, adhesive and processing aid from step (1) into a container, stir and mix evenly to obtain an adhesive.

[0057] (3) Apply the adhesive from step (2) at a concentration of 20 g / m 2 Apply the coating to the adhesive surface of the face material, bake it in an oven at 50°C for 30 minutes, and after cooling, press the release paper onto the adhesive surface of the face material. After die-cutting, you can obtain a self-adhesive repair label with a structure consisting of a face material layer, an adhesive layer, and a release paper base layer.

[0058] Note: In the above steps, the modified starch is composed of hydroxyalkyl starch and phosphate starch in a weight ratio of 1:2; the functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a weight ratio of 5:1; the binder is polyvinyl alcohol, purchased from Guangzhou Ars New Materials Co., Ltd. as BP-17 / 1788; the processing aid is leveling agent, purchased from Chemours Capstone FS-3100; the face layer is made of 10-mil 48P soft halogen-free environmentally friendly semi-transparent frosted PVC, purchased from Dongguan Huade Plastics Co., Ltd., item number HD-A3; the release paper layer is made by coating release paper base paper with solvent-free PE film and silicone molding, purchased from Wuxi Ruxu Composite Materials Co., Ltd. as release base paper silicone oil paper, item number RX-LMZ-002.

[0059] Example 2-3

[0060] A self-adhesive repair label differs from Example 1 in that the raw materials of the adhesive layer and their corresponding weights are shown in Table 1.

[0061] Table 1. Raw materials and their weight parts (kg / part) of each component of each adhesive layer in Examples 1-3

[0062]

[0063]

[0064] Example 4

[0065] A self-adhesive repair label, which differs from Example 1 in that the modified starch is composed of hydroxyalkyl starch and phosphate starch in a weight ratio of 1:1.6.

[0066] Example 5

[0067] A self-adhesive repair label, which differs from Example 1 in that the modified starch is composed of hydroxyalkyl starch and phosphate starch in a weight ratio of 1:2.8.

[0068] Example 6

[0069] A type of self-adhesive repair label, which differs from Example 1 in that the modified starch is composed of hydroxyalkyl starch and phosphate starch in a weight ratio of 1:2.2.

[0070] Example 7

[0071] A self-adhesive repair label, which differs from Example 1 in that the modified starch is composed of hydroxyalkyl starch and phosphate starch in a weight ratio of 1:1.5.

[0072] Example 8

[0073] A self-adhesive repair label, which differs from Example 1 in that the modified starch is composed of hydroxyalkyl starch and phosphate starch in a weight ratio of 1:3.

[0074] Example 9

[0075] A self-adhesive repair label, which differs from Example 1 in that the modified starch does not contain hydroxyalkyl starch.

[0076] Example 10

[0077] A self-adhesive repair label, which differs from Example 1 in that the modified starch does not contain phosphate starch.

[0078] Example 11

[0079] A self-adhesive leak repair label, which differs from Example 1 in that the functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a weight ratio of 3:1.

[0080] Example 12

[0081] A self-adhesive repair label, which differs from Example 1 in that the functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a weight ratio of 8:1.

[0082] Example 13

[0083] A self-adhesive repair label differs from Example 1 in that the functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a weight ratio of 5.5:1.

[0084] Example 14

[0085] A self-adhesive repair label, which differs from Example 1 in that the functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a weight ratio of 2:1.

[0086] Example 15

[0087] A self-adhesive leak repair label, which differs from Example 1 in that the functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a weight ratio of 9:1.

[0088] Example 16

[0089] A self-adhesive repair label, which differs from Example 1 in that the functional powder does not contain aluminum nitride ceramic powder.

[0090] Example 17

[0091] A self-adhesive repair label, which differs from Example 1 in that the functional powder does not contain silica ceramic powder.

[0092] Example 18

[0093] A self-adhesive repair label differs from Example 1 in that the adhesive layer contains 3.5 parts by weight of a stabilizing agent, which is composed of water-soluble polyimide and silane coupling agent in a weight ratio of 9:1.

[0094] Example 19

[0095] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent is composed of water-soluble polyimide and silane coupling agent in a weight ratio of 6:1.

[0096] Example 20

[0097] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent is composed of water-soluble polyimide and silane coupling agent in a weight ratio of 15:1.

[0098] Example 21

[0099] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent is composed of water-soluble polyimide and silane coupling agent in a weight ratio of 10.5:1.

[0100] Example 22

[0101] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent is composed of water-soluble polyimide and silane coupling agent in a weight ratio of 5:1.

[0102] Example 23

[0103] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent is composed of water-soluble polyimide and silane coupling agent in a weight ratio of 16:1.

[0104] Example 24

[0105] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent does not contain water-soluble polyimide.

[0106] Example 25

[0107] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent does not contain a silane coupling agent.

[0108] Example 26

[0109] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent is present in 2.5 parts by weight.

[0110] Example 27

[0111] A self-adhesive repair label, which differs from Example 1 in that the stabilizing agent is present in 4.5 parts by weight.

[0112] Comparative Example

[0113] Comparative Example 1

[0114] A self-adhesive repair label, which differs from Example 1 in that the adhesive layer does not contain modified starch in its raw material.

[0115] Comparative Example 2

[0116] A self-adhesive repair label differs from Example 1 in that the liquid rosin resin is replaced by an acrylic resin emulsion.

[0117] Comparative Example 3

[0118] A self-adhesive repair label differs from Example 1 in that the acrylic resin emulsion is replaced by liquid rosin resin.

[0119] Performance testing test samples: The self-adhesive repair labels obtained in Examples 1-27 were used as test samples 1-27, and the self-adhesive repair labels obtained in Comparative Examples 1-3 were used as control samples 1-3.

[0120] Experimental Method: A 175×25mm self-adhesive repair label was cut as a standard sample and placed in a standard environment of 25℃ and 50% relative humidity for 4 hours. Then, it was affixed to a clean standard test board. The test board material was 1Cr18Ni9Ti as specified in GB / T3280-1992, with a thickness of 2mm, a width of 40mm, and a length of 200mm. A standard pressure roller was used to press the label twice in each direction at a speed of 10mm / s without applying pressure, and the label was left to rest for 20 minutes. The pressure roller was a steel wheel with a diameter of 84mm and a width of 45mm, coated with rubber. The rubber coating had a hardness (Shore A) of 80° and a thickness of 6mm. The weight of the roller was 2000g. The test was then conducted using a CZY-6S tack tester, which conforms to the national standard GB / T... Designed and manufactured in accordance with the specifications of 4851-2014, this product is applicable to the holding power test of pressure-sensitive adhesive tapes, medical patches, self-adhesive labels, protective films, and other products. The initial value is denoted as A1.

[0121] Repeat the above operation. After the standard sample is adhered, heat to 50℃ at 3℃ / min and hold for 10min. Then cool to -5℃ at 2℃ / min and hold for 5min. Then restore to 25℃ at 2℃ / min to complete one cycle. Continue for 3 cycles. Then test with CZY-6S tack tester. The value after the cycle test is recorded as A2.

[0122] After completing the experiments on test samples 1-27 and control samples 1-3 in sequence, calculate the corresponding holding loss rate for each sample. The holding loss rate (%) = (A1-A2) / A1, accurate to 0.01, and is recorded in Table 2 below.

[0123] Table 2 Test results of test samples 1-27 and control samples 1-3

[0124]

[0125]

[0126] As can be seen from Examples 1-3 and Comparative Example 1, and Table 2, the use of modified starch can improve the temperature resistance of self-adhesive repair labels, and the experimentally obtained tack loss rate is low. Furthermore, as can be seen from Examples 4-8 and Table 2, modified starch composed of hydroxyalkyl starch and phosphate starch in a weight ratio of 1:(1.6-2.8) can all exhibit relatively stable application effects, maintaining excellent and stable temperature resistance of the self-adhesive repair labels. The best overall effect is achieved when the weight ratio of hydroxyalkyl starch to phosphate starch is 1:2. However, when the ratio of hydroxyalkyl starch to phosphate starch exceeds the above range, the temperature resistance is significantly reduced. Furthermore, as can be seen from Examples 9-10 and Table 2, while using either hydroxyalkyl starch or phosphate starch alone can improve temperature resistance to some extent, the improvement is far less significant than the effect of using both in combination. Therefore, it can be seen that only when hydroxyalkyl starch and phosphate starch are used in a specific ratio range to form modified starch can the temperature resistance of the self-adhesive repair label be significantly improved in this application.

[0127] Combining Examples 1 and 11-15 with Table 2, it can be seen that functional powders composed of aluminum nitride ceramic powder and silicon oxide ceramic powder in a weight ratio of (3-8):1 can all exert a stable effect during application, maintaining excellent and stable temperature resistance of the self-adhesive repair labels. The overall effect is optimal when the weight ratio of aluminum nitride ceramic powder to silicon oxide ceramic powder is 5:1. However, when the combination of aluminum nitride ceramic powder and silicon oxide ceramic powder exceeds the above ratio range, the experimentally measured tack loss rate increases, indicating a significant loss in the temperature resistance of the self-adhesive repair labels. Furthermore, combining Examples 16-17 with Table 2, it can be seen that when either aluminum nitride ceramic powder or silicon oxide ceramic powder is used as the functional powder, the temperature resistance of the resulting self-adhesive repair labels is significantly poor, indicating a strong synergistic effect between the two.

[0128] Combining Examples 1 and 18-21 with Table 2, it can be seen that adding a stabilizing agent composed of water-soluble polyimide and silane coupling agent in a weight ratio of (6-15):1 helps to further improve the temperature resistance of self-adhesive repair labels. The improvement effect is particularly excellent when the weight ratio of water-soluble polyimide to silane coupling agent is 9:1. Furthermore, combining Examples 22-23 with Table 2, it can be seen that when water-soluble polyimide and silane coupling agent are used in combination outside the above ratio range, the improvement effect is far less, precisely illustrating the necessity of the above weight ratio range. Combining Examples 24-25 with Table 2, it can be seen that adding water-soluble polyimide or silane coupling agent alone can reduce the holding power loss rate, but the reduction is small and far less effective than the improvement brought by the combination of the two. The stabilizing agent, through the synergistic effect of the combination of the two raw materials, significantly improves the temperature resistance of self-adhesive repair labels.

[0129] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A self-adhesive repair label, comprising a face material layer, an adhesive layer, and a release paper backing layer arranged sequentially, characterized in that, The adhesive layer is made from raw materials comprising the following parts by weight: 40-60 parts of acrylic resin emulsion; 8-10 parts of liquid rosin resin; 5-8 parts of modified starch; 4-7 parts of functional powder; 30-40 parts of ethyl acetate diluent; 15-25 parts adhesive; 5-10 parts of processing aids; The modified starch is composed of hydroxyalkyl starch and phosphate starch, and the weight ratio of hydroxyalkyl starch to phosphate starch is 1:(1.6-2.8). The functional powder is composed of aluminum nitride ceramic powder and silicon oxide ceramic powder, and the weight ratio of aluminum nitride ceramic powder to silicon oxide ceramic powder is (3-8):1; It also contains 2.5-4.5 parts by weight of a stabilizing agent, which is composed of water-soluble polyimide and silane coupling agent, and the weight ratio of water-soluble polyimide to silane coupling agent is (6-15):

1. The adhesive is a combination of one or more of polyvinyl alcohol, hydroxyethyl cellulose and sodium silicate.

2. The self-adhesive repair label according to claim 1, characterized in that: The weight ratio of the hydroxyalkyl starch to the phosphate starch is 1:

2.

3. The self-adhesive repair label according to claim 1, characterized in that: The weight ratio of the aluminum nitride ceramic powder to the silicon oxide ceramic powder is 5:

1.

4. The self-adhesive repair label according to claim 1, characterized in that: The weight ratio of the water-soluble polyimide to the silane coupling agent is 9:

1.

5. The self-adhesive repair label according to claim 1, characterized in that: The processing aid is one or a combination of several of the following: flame retardants, antioxidants, leveling agents, and thickeners.

6. The method for preparing the self-adhesive repair label according to claim 1, characterized in that: Includes the following steps: (1) Prepare raw materials containing acrylic resin emulsion, liquid rosin resin, modified starch, functional powder, ethyl acetate diluent, adhesive and processing aid according to the formula; (2) Put the acrylic resin emulsion, liquid rosin resin, modified starch, functional powder, ethyl ester diluent, adhesive and processing aid from step (1) into a container, stir and mix evenly to obtain an adhesive. (3) Apply the adhesive from step (2) to the bonding surface of the face material, bake it in an oven, and after cooling, press the release paper onto the bonding surface of the face material. After die-cutting, you can obtain a self-adhesive repair label with a structure consisting of a face material layer, an adhesive layer and a release paper base layer.

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