Low temperature resistant label and method for manufacturing the same

Abstract

The application relates to the field of labels, in particular to a low-temperature-resistant label and a preparation method thereof. The low-temperature-resistant label comprises a surface layer, a bonding layer, a silicone oil layer and a release layer arranged in sequence; the bonding layer is prepared from bonding glue, and the bonding glue comprises the following raw materials in mass fractions: 65-85 parts of SIS elastomer, 40-60 parts of petroleum resin, 20-35 parts of tackifying resin, 5-15 parts of plasticizer, 0.1-3 parts of antioxidant, 8-18 parts of calcium sulfate whisker, 1-5 parts of silica ash and 1-5 parts of alumina ceramic. The preparation method comprises the following steps: preparing the bonding glue; coating the bonding glue on the surface of the surface layer to form the bonding layer; coating silicone oil on the release layer to form the silicone oil layer; and pressing the bonding layer connected with the surface layer and the silicone oil layer connected with the release layer to obtain the product. The application has the advantages of improving the adhesion of the label in a low-temperature environment.

Description

Technical Field

[0001] This application relates to the field of labels, and more specifically, to a low-temperature resistant label and a method for preparing the same. Background Technology

[0002] Labels are widely used on the packaging of food, alcohol, and pharmaceutical products. To use them, simply peel them off the release layer and press lightly to adhere them to the surface of the object to be labeled.

[0003] With the promotion of food delivery and self-pickup services, after an order for milk tea or other beverages is placed, the type of drink and the customer's requirements are labeled on the surface of the empty plastic cup. Once the beverage is prepared, staff immediately pack it up, waiting for the delivery person or customer to pick it up. In order to shorten the waiting time, the time between each step is very limited.

[0004] Under these circumstances, when a consumer orders a cold or iced drink, many small water droplets quickly form on the surface of the plastic cup. The temperature of the plastic cup drops rapidly and continuously, causing the label to lose its adhesiveness or even fall off. If the label falls off, staff, delivery drivers, and consumers will not be able to know what kind of beverage is inside the plastic cup, which is very inconvenient.

[0005] Therefore, the impact of cold drinks and iced drinks on labeling needs to be improved. Summary of the Invention

[0006] To improve the adhesion of labels at low temperatures, this application provides a low-temperature resistant label and a method for preparing the same.

[0007] Firstly, this application provides a low-temperature resistant label, employing the following technical solution:

[0008] A low-temperature resistant label includes a surface layer, an adhesive layer, a silicone oil layer, and a release layer arranged sequentially.

[0009] The adhesive layer is made of an adhesive, which comprises the following raw materials in parts by weight: 65-85 parts SIS elastomer, 40-60 parts petroleum resin, 20-35 parts tackifying resin, 5-15 parts plasticizer, 0.1-3 parts antioxidant, and 8-18 parts...

[0010] Calcium sulfate whiskers, 1-5 parts silica fume, 1-5 parts alumina ceramics.

[0011] By adopting the above technical solution, the alumina ceramic, calcium sulfate whiskers, and silica fume work together to fill the gaps and pores in the adhesive system. Furthermore, the active surfaces of the three components work together with the polymer chains of the matrix to form a special connection structure, filling the gaps in the structure and reducing defects such as cracks and fractures. This results in a denser adhesive, a more stable structure, stronger cohesive strength, and a more secure bond to the surface of the milk tea cup.

[0012] Alumina ceramics contain numerous pores, allowing some silica fume to enter and enhance their strength. Simultaneously, calcium sulfate whiskers also penetrate these pores, creating a strong bond between the alumina ceramic, calcium sulfate whiskers, and silica fume, binding them together as a single unit. In short, the unique structure of alumina ceramics, calcium sulfate whiskers, and silica fume not only fills the gaps within the adhesive's internal structure but also strengthens the bond between the adhesive's components, resulting in a more powerful adhesive.

[0013] When the temperature of a milk tea cup drops suddenly, it triggers thermal expansion and contraction. The pores within the alumina ceramic provide space for this expansion and contraction, giving the label better adaptability to temperature changes and reducing the likelihood of significant performance alterations due to temperature fluctuations. Furthermore, the integrated alumina ceramic, calcium sulfate whiskers, and silica fume effectively accelerate the diffusion of temperature changes within the adhesive system, ensuring rapid and uniform temperature changes throughout. This mitigates the problem of concentrated temperature drops leading to damage at a single point and subsequent rapid structural failure.

[0014] Preferably, the calcium sulfate whiskers are 12-15 parts by mass, the silica fume is 1-3 parts by mass, and the alumina ceramic is 2.5-4.5 parts by mass.

[0015] By adopting the above technical solution, the specific dosage of calcium sulfate whiskers, silica fume, and alumina ceramics is further limited, so that the three have a more complete synergistic effect, thereby further improving the adhesive strength and low-temperature bonding stability of the adhesive.

[0016] Preferably, the particle size of the alumina ceramic is 5-10 mm.

[0017] Preferably, the plasticizer is one or a mixture of dioctyl phthalate, dibutyl phthalate, and butyl benzyl phthalate.

[0018] Preferably, the plasticizer is dioctyl phthalate.

[0019] By adopting the above technical solution and selecting dioctyl phthalate as a plasticizer, when dioctyl phthalate enters the polymer chains, it can effectively weaken the excessive force between the polymer chains, which is equivalent to opening up the polymer chains. This makes it easier and more abundant for calcium sulfate whiskers, silica fume, and alumina ceramics to enter the polymer chains and exert a special synergistic effect, which is beneficial to improving the bonding strength, adhesion and stability of the adhesive.

[0020] Preferably, the calcium sulfate whiskers have a length of 250-300 μm and a diameter of 5-10 μm.

[0021] By adopting the above technical solution, the length, diameter and other specifications of calcium sulfate whiskers are further limited. Under these specifications, calcium sulfate whiskers can better connect calcium sulfate whiskers and silica fume, making the generated structure more stable and less prone to falling off.

[0022] Preferably, the calcium sulfate whiskers are modified calcium sulfate whiskers, and the preparation method of modified calcium sulfate whiskers includes the following steps:

[0023] Mix alcohol solution, tetraethoxysilane, and water in a volume ratio of (1.2-1.5):1:(0.3-0.6), then adjust the pH to 5-6, and let stand to obtain a silica solution.

[0024] Calcium sulfate whiskers were mixed with silica solution at a volume ratio of 1:(20-30), soaked for 1-3 minutes, and the pH was adjusted to 8-9. Then, the mixture was soaked for another 15-25 minutes. The resulting modified calcium sulfate whiskers were then obtained.

[0025] Calcium sulfate whiskers have poor compatibility with raw materials such as SIS elastomers in their natural state. Directly mixing calcium sulfate whiskers with raw materials such as SIS elastomers can easily lead to instability in the system, thus affecting the special compatibility of calcium sulfate whiskers with silica fume and alumina ceramics.

[0026] By employing the above technical solution, a silica film is formed on the surface of calcium sulfate whiskers, thereby improving the compatibility between the calcium sulfate whiskers and the substrate. The structure formed by silica fume, calcium sulfate whiskers, and alumina ceramics can also be more firmly bonded in the system. Furthermore, because a film is formed on the surface of the calcium sulfate whiskers, the whiskers are less likely to agglomerate, further improving dispersibility and facilitating a tighter bond with the substrate.

[0027] Preferably, the method for preparing the modified calcium sulfate whiskers further includes the following steps:

[0028] Mix the silane coupling agent with the alcohol solution at a volume ratio of 1:(50-100) to obtain a silane coupling agent solution for later use;

[0029] After removing the calcium sulfate whiskers from the silica solution, the soaked calcium sulfate whiskers are mixed with a silane coupling agent solution, and then the mixture is removed to obtain modified calcium sulfate whiskers.

[0030] The mass ratio of calcium sulfate whiskers to silane coupling agent is 1:(0.05-0.1).

[0031] By adopting the above technical solution, after coating the surface of calcium sulfate whiskers with silicon dioxide, and then treating them with a silane coupling agent, the compatibility between the obtained modified calcium sulfate whiskers and the matrix can be further improved.

[0032] Furthermore, the calcium sulfate whiskers coated with silica can more easily react and coordinate with silane coupling agents, reducing the difficulty of modification.

[0033] Secondly, this application provides a method for preparing a low-temperature resistant label, which adopts the following technical solution:

[0034] A method for preparing a low-temperature resistant label includes the following steps:

[0035] Preparation of adhesive:

[0036] Place the SIS elastomer at a temperature of 100-120℃, then add the antioxidant and stir until homogeneous;

[0037] Add tackifying resin, petroleum resin, and plasticizer, and stir until homogeneous;

[0038] Then add calcium sulfate whiskers, silica fume, and alumina ceramic, and stir until homogeneous;

[0039] Extrusion and discharge yield adhesive;

[0040] Apply adhesive to the surface layer to form an adhesive layer;

[0041] Silicone oil is coated onto the release layer to form a silicone oil layer;

[0042] The adhesive layer that connects to the surface layer and the silicone oil layer that connects to the release layer are pressed together to obtain the product.

[0043] By employing the above technical solution and using a specially prepared adhesive to bond with the surface layer, the label can be firmly adhered to the milk tea cup after being applied. Furthermore, even when the milk tea cup is filled with a large amount of cold or iced beverage, causing the temperature to drop, the label is not easily affected by temperature differences or water droplets, and maintains a good adhesive effect.

[0044] In summary, this application has the following beneficial effects:

[0045] 1. With the combined action of alumina ceramics, calcium sulfate whiskers, and silica fume, the three components fill the gaps and pores in the adhesive system. Furthermore, the active surfaces of the three components work together with the polymer chains of the matrix to form a special connection structure, filling the gaps in the structure and reducing defects such as cracks and fractures. This results in a denser adhesive, a more stable structure, stronger cohesive strength, and a more secure bond to the surface of the milk tea cup.

[0046] 2. Alumina ceramics, calcium sulfate whiskers, and silica fume are integrated to form a special structure. This special structure can not only fill the gaps in the internal structure of the adhesive, but also improve the bonding strength of the various raw materials in the adhesive, giving the adhesive greater bonding ability.

[0047] 3. The adhesive of this application can rapidly diffuse temperature changes and has reserved deformation space for thermal expansion and contraction, so that large temperature changes have little impact on the performance of the adhesive. Detailed Implementation

[0048] The present application will be further described in detail below with reference to the embodiments.

[0049] The raw materials used in the following examples and comparative examples are all commercially available products.

[0050] Example

[0051] Example 1

[0052] A low-temperature resistant label includes a surface layer, an adhesive layer, a silicone oil layer, and a release layer arranged sequentially.

[0053] The adhesive layer is made of adhesive, which includes the following raw materials: SIS elastomer, petroleum resin, tackifying resin, plasticizer, antioxidant, calcium sulfate whiskers, silica fume, and alumina ceramic.

[0054] The specific usage of each raw material is detailed in Table 1.

[0055] The SIS elastomer was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., with product number YH-1209-1.

[0056] The petroleum resin is C5 petroleum resin, purchased from Shandong Kepler Biotechnology Co., Ltd., model number kpl-66652.

[0057] The tackifying resin is from Jinan Mingrun Chemical Co., Ltd.

[0058] The plasticizer is dioctyl phthalate.

[0059] The antioxidant is DLTP.

[0060] The calcium sulfate whiskers are 250 μm long and 5 μm in diameter.

[0061] The silica fume is 1500 mesh.

[0062] The alumina ceramics were purchased from Jiangxi Naike Chemical Equipment Packing Co., Ltd., with a particle size of 5mm and an alumina content of 95%.

[0063] This application also provides a method for preparing a low-temperature resistant label, comprising the following steps:

[0064] Step 1): Prepare the adhesive:

[0065] Step 1a): Put the SIS elastomer into a mixer, adjust the temperature to 120°C, then add the antioxidant and stir for 10 minutes until homogeneous.

[0066] Step 1b): Continue adding tackifying resin, petroleum resin, and plasticizer to the internal mixer and stir until homogeneous.

[0067] Step 1c): Continue to add calcium sulfate whiskers, silica fume, and alumina ceramics to the internal mixer and stir until uniform.

[0068] Step 1d): Mix all raw materials together for 20 minutes, then extrude and granulate them to obtain adhesive.

[0069] Step 2): Apply the adhesive evenly to one side of the surface layer using a curtain coating method. The total coating amount is 15 g / cm². 2 The coating speed is 300m / min.

[0070] Step 3): Dry the surface layer coated with adhesive in Step 2) at a temperature of 120°C for 15 minutes to form an adhesive layer.

[0071] Step 4): Calender the material from step 3).

[0072] Step 5): Apply silicone oil to the side of the release layer to form a silicone oil layer on the side of the release layer.

[0073] Step 6): Press the material obtained from the calendering process in step 4) together with the material obtained in step 5), so that the adhesive layer and the silicone oil layer are connected to each other; and the product is obtained.

[0074] Example 2

[0075] A low-temperature resistant label, which differs from Example 1 in that,

[0076] The plasticizer is dibutyl phthalate.

[0077] The calcium sulfate whiskers are 300 μm long and 10 μm in diameter.

[0078] The alumina ceramic particle size is 10 mm.

[0079] The amount of each raw material used varies; please refer to Table 1 for details.

[0080] A method for preparing a low-temperature resistant label, which differs from Example 1 in that, in step 1a), the temperature in the internal mixer is 100°C.

[0081] Example 3

[0082] A low-temperature resistant label, which differs from Example 1 in that,

[0083] The plasticizer is butyl benzyl phthalate.

[0084] The amount of each raw material used varies; please refer to Table 1 for details.

[0085] Example 4

[0086] A low-temperature resistant label, which differs from Example 1 in that the plasticizer is butyl benzyl phthalate.

[0087] Example 5

[0088] A low-temperature resistant label, which differs from Example 1 in that,

[0089] The calcium sulfate whiskers are modified calcium sulfate whiskers. The preparation method of the modified calcium sulfate whiskers includes the following steps:

[0090] Step 01): Mix the alcohol solution, tetraethoxysilane, and water in a volume ratio of 1.3:1:0.5 and stir in a water bath at 60°C.

[0091] Then, the pH was adjusted to 5 using hydrochloric acid, and stirring was continued for 4 hours to obtain a silica solution.

[0092] The alcohol solution is anhydrous ethanol.

[0093] Step 02): Mix calcium sulfate whiskers with silica solution at a volume ratio of 1:25, and completely immerse the calcium sulfate whiskers in the silica solution. Immersion time is 2 minutes.

[0094] Then adjust the pH to 8 using sodium hydroxide solution, and soak for another 20 minutes.

[0095] Step 03): After removing the calcium sulfate whiskers obtained in step 02) from the silica solution, the solid and liquid are separated, and the solid is dried in hot air at 80°C for 3 hours.

[0096] Step 04): Mix the silane coupling agent with the alcohol solution at a volume ratio of 1:50 to obtain a silane coupling agent solution for later use.

[0097] The silane coupling agent is specifically KH-560, which is commercially available.

[0098] The alcohol solution is anhydrous ethanol.

[0099] The mass ratio of calcium sulfate whiskers to silane coupling agent is 1:0.05.

[0100] Step 05): Add the dried material from step 03) to the prepared silane coupling agent solution from step 04), mix, and stir for 30 minutes.

[0101] Step 06): The material from step 05) is subjected to solid-liquid separation. The solid is dried in hot air at 100°C for 3 hours to obtain modified calcium sulfate whiskers.

[0102] Example 6

[0103] A low-temperature resistant label, which differs from Example 5 in that...

[0104] The amount of calcium sulfate whiskers is 15 kg, silica fume is 3 kg, and alumina ceramics is 4.5 kg.

[0105] The specific dosage is summarized in Table 1.

[0106] The calcium sulfate whiskers are modified calcium sulfate whiskers. The preparation method of the modified calcium sulfate whiskers includes the following steps:

[0107] Step 01): Mix the alcohol solution, tetraethoxysilane, and water in a volume ratio of 1.5:1:0.6 and stir in a water bath at 60°C.

[0108] Then, the pH was adjusted to 6 using hydrochloric acid, and stirring was continued for 4 hours to obtain a silica solution.

[0109] The alcohol solution is anhydrous ethanol.

[0110] Step 02): Mix calcium sulfate whiskers with silica solution at a volume ratio of 1:30, and completely immerse the calcium sulfate whiskers in the silica solution. Immersion time is 1 minute.

[0111] Then adjust the pH to 9 using sodium hydroxide solution, and soak for another 15 minutes.

[0112] Step 03): After removing the calcium sulfate whiskers obtained in step 02) from the silica solution, the solid and liquid are separated, and the solid is dried in hot air at 80°C for 3 hours.

[0113] Step 04): Mix the silane coupling agent and the alcohol solution at a volume ratio of 1:100 to obtain a silane coupling agent solution for later use.

[0114] The silane coupling agent is specifically KH-560, which is commercially available.

[0115] The alcohol solution is anhydrous ethanol.

[0116] The mass ratio of calcium sulfate whiskers to silane coupling agent is 1:0.1.

[0117] Step 05): Add the dried material from step 03) to the prepared silane coupling agent solution from step 04), mix, and stir for 30 minutes.

[0118] Step 06): The material from step 05) is subjected to solid-liquid separation. The solid is dried in hot air at 100°C for 3 hours to obtain modified calcium sulfate whiskers.

[0119] Example 7

[0120] A low-temperature resistant label, which differs from Example 5 in that...

[0121] The amount of calcium sulfate whiskers is 13 kg, silica fume is 1 kg, and alumina ceramics is 2.5 kg.

[0122] The specific dosage is summarized in Table 1.

[0123] The calcium sulfate whiskers are modified calcium sulfate whiskers. The preparation method of the modified calcium sulfate whiskers includes the following steps:

[0124] Step 01): Mix the alcohol solution, tetraethoxysilane, and water in a volume ratio of 1.2:1:0.3 and stir in a water bath at 60°C.

[0125] Then, the pH was adjusted to 5 using hydrochloric acid, and stirring was continued for 4 hours to obtain a silica solution.

[0126] The alcohol solution is anhydrous ethanol.

[0127] Step 02): Mix calcium sulfate whiskers with silica solution at a volume ratio of 1:20, and completely immerse the calcium sulfate whiskers in the silica solution. Immersion time is 3 minutes.

[0128] Then adjust the pH to 8 using sodium hydroxide solution, and soak for another 25 minutes.

[0129] Step 03): After removing the calcium sulfate whiskers obtained in step 02) from the silica solution, the solid and liquid are separated, and the solid is dried in hot air at 80°C for 3 hours.

[0130] Step 04): Mix the silane coupling agent with the alcohol solution at a volume ratio of 1:50 to obtain a silane coupling agent solution for later use.

[0131] The silane coupling agent is specifically KH-560, which is commercially available.

[0132] The alcohol solution is anhydrous ethanol.

[0133] The mass ratio of calcium sulfate whiskers to silane coupling agent is 1:0.05.

[0134] Step 05): Add the dried material from step 03) to the prepared silane coupling agent solution from step 04), mix, and stir for 30 minutes.

[0135] Step 06): The material from step 05) is subjected to solid-liquid separation. The solid is dried in hot air at 100°C for 3 hours to obtain modified calcium sulfate whiskers.

[0136] Table 1

[0137] Category Example 1 Example 2 Example 3 Example 5 Example 6 Example 7 SIS elastomer (kg) 70 65 85 70 70 70 Petroleum resin (kg) 50 40 60 50 50 50 Tackifying resin (kg) 25 20 35 25 25 25 Plasticizer (kg) 10 5 15 10 10 10 Antioxidants (kg) 1 0.1 3 1 1 1 Calcium sulfate whiskers (kg) 12 8 18 12 15 13 Silica fume (kg) 2 1 5 2 3 1 Alumina ceramics (kg) 3 1 5 3 4.5 2.5

[0138] Example 8

[0139] A low-temperature resistant label, which differs from Example 5 in that calcium sulfate whiskers are mixed with a silica solution at a volume ratio of 1:50.

[0140] Example 9

[0141] A low-temperature resistant label, differing from Example 5 in that step 02) is:

[0142] Calcium sulfate whiskers and silica solution were mixed at a volume ratio of 1:25. The calcium sulfate whiskers were then completely immersed in the silica solution for 22 minutes.

[0143] Example 10

[0144] A low-temperature resistant label, which differs from Example 5 in that steps 04), 05), and 06 are omitted.

[0145] Comparative Example

[0146] Comparative Example 1

[0147] A low-temperature resistant label, which differs from Example 1 in that calcium sulfate whiskers are replaced with silicon carbide whiskers, i.e., 0 kg of calcium sulfate whiskers and 12 kg of silicon carbide whiskers.

[0148] Comparative Example 2

[0149] A low-temperature resistant label, which differs from Example 1 in that silica fume is replaced with limestone powder, i.e., 0 kg of silica fume and 2 kg of limestone powder.

[0150] Comparative Example 3

[0151] A low-temperature resistant label, which differs from Example 1 in that alumina ceramic is replaced with zirconia ceramic, i.e., alumina ceramic weighs 0 kg and zirconia ceramic weighs 3 kg.

[0152] Comparative Example 4

[0153] A low-temperature resistant label, which differs from Example 1 in that it contains 5 kg of calcium sulfate whiskers, 6 kg of silica fume, and 6 kg of alumina ceramic.

[0154] Performance testing

[0155] 1. Physicochemical testing: The adhesives of Examples 1-10 and Comparative Examples 1-4 were tested according to GB / T 2792-2014 "Test method for peel strength of adhesive tape".

[0156] Test 1 was conducted at room temperature (23°C) in accordance with Method 1.

[0157] Test 2 was conducted according to Appendix A, with a low temperature of 4°C and a storage period of 24 hours.

[0158] The peel strength measured by the above tests is recorded in Table 2.

[0159] 2. Simulated test: The labels of Examples 1-10 and Comparative Examples 1-4 were affixed to the outer wall of the milk tea plastic cup, and then placed in an environment with 95% humidity and 10℃ for 72 hours. After taking them out, we observed whether the labels were wrinkled, curled at the edges, or fell off.

[0160] The above test results are recorded in Table 2.

[0161] Table 2

[0162]

[0163] A comparison of the test data from Example 1 and Comparative Examples 1-3 in Table 2 shows that the adhesive prepared in Example 1 exhibits higher peel strength than the adhesives in Comparative Examples 1-3, regardless of whether the environment is at room temperature or low temperature. Furthermore, a comparison of the simulated test results also shows that the adhesive in Example 1 maintains good adhesion to the plastic milk tea cup even in low-temperature and humid environments; while the adhesives in Comparative Examples 1-3 all exhibit varying degrees of wrinkling and edge lifting in multiple locations. This indicates that the adhesive provided in this application has high adhesive performance and maintains good adhesion even under humid and low-temperature conditions; the adhesive also maintains good performance when applied to labels.

[0164] Furthermore, comparing the test data with Comparative Example 4, it can be seen that although the peel strength of Comparative Example 4 at room temperature and low temperature is higher than that of Comparative Examples 1-3, it is still significantly inferior to the effect of Example 1. This indicates that the technical solution provided in this application is a special organic whole, which not only requires the combination of raw materials such as alumina ceramics, calcium sulfate whiskers, and silica fume, but also requires the combination of alumina ceramics, calcium sulfate whiskers, and silica fume in specific amounts to achieve a special synergistic effect.

[0165] According to the comparison of the test data of Example 1 and Example 4 in Table 2, it can be seen that when a specific dioctyl phthalate is selected as the plasticizer, it is beneficial to provide a better system for the combination of alumina ceramics, calcium sulfate whiskers and silica fume, so that the low temperature environment has less impact on the bonding performance.

[0166] According to the comparison of the test data of Example 1 and Examples 5-7 in Table 2, it can be seen that after special modification of calcium sulfate whiskers, the peel strength of the prepared adhesive is further improved in room temperature and low temperature tests.

[0167] A comparison of the test data from Examples 5 and 8 and 9 in Table 2 shows that arbitrarily disrupting the specific volume ratio between calcium sulfate whiskers and silica solution, or changing the immersion conditions between calcium sulfate whiskers and silica solution, significantly affects the modification of calcium sulfate whiskers. In Example 9, the reaction was carried out at approximately pH 7 without adjusting the pH using sodium hydroxide. Therefore, the inventors speculate that these changes prevent silica from forming a continuous and dense film on the surface of calcium sulfate whiskers, thus affecting the compatibility of the modified calcium sulfate whiskers with the other raw materials, resulting in a less significant increase in peel strength in Examples 8 and 9 compared to Example 5.

[0168] According to the comparison of the test data of Example 5 and Example 10 in Table 2, it can be seen that after coating the surface of calcium sulfate whiskers with a layer of silica film, the modification of them with silane coupling agent is beneficial to further improve the compatibility of calcium sulfate whiskers with other raw materials, and has better compatibility and stability in the adhesive system, which is beneficial to further improve the bonding effect of the adhesive in low temperature and humid environment.

[0169] 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 low-temperature resistant label, characterized in that, It includes a top layer, an adhesive layer, a silicone oil layer, and a release layer, arranged sequentially. The adhesive layer is made of adhesive, which includes the following raw materials in parts by weight: 65-85 parts SIS elastomer, 40-60 parts petroleum resin, 20-35 parts tackifying resin, 5-15 parts plasticizer, 0.1-3 parts antioxidant, 12-15 parts modified calcium sulfate whiskers, 1-3 parts silica fume, and 2.5-4.5 parts alumina ceramic. The method for preparing the modified calcium sulfate whiskers includes the following steps: Step 01: Mix alcohol solution, tetraethoxysilane, and water in a volume ratio of (1.2-1.5):1:(0.3-0.6), then adjust the pH to 5-6, let stand, and obtain a silica solution; Step 02: Mix calcium sulfate whiskers with silica solution at a volume ratio of 1:(20-30), soak for 1-3 minutes, adjust the pH to 8-9, and then soak for 15-25 minutes to obtain preliminarily modified calcium sulfate whiskers. Step 03: After removing the preliminarily modified calcium sulfate whiskers obtained in step 02 from the silica solution, the solid and liquid are separated, and the solid is dried in hot air at 80°C for 3 hours. Step 04: Mix the silane coupling agent and the alcohol solution at a volume ratio of 1:(50-100) to obtain a silane coupling agent solution for later use; Step 05: Add the dried material from Step 03 to the silane coupling agent solution prepared in Step 04, mix, and stir for 30 minutes. The mass ratio of the calcium sulfate whiskers to the silane coupling agent is 1:(0.05-0.1). Step 06: Perform solid-liquid separation on the material from Step 05, and then dry the solid in hot air at 100°C for 3 hours to obtain the modified calcium sulfate whiskers.

2. The low-temperature resistant label according to claim 1, characterized in that: The plasticizer is one or a mixture of dioctyl phthalate, dibutyl phthalate, and butyl benzyl phthalate.

3. The low-temperature resistant label according to claim 2, characterized in that: The plasticizer is dioctyl phthalate.

4. The low-temperature resistant label according to claim 1, characterized in that: The calcium sulfate whiskers are 250-300 μm in length and 5-10 μm in diameter.

5. A method for preparing a low-temperature resistant label according to any one of claims 1-4, characterized in that, Includes the following steps: Preparation of adhesive: Place the SIS elastomer at a temperature of 100-120℃, then add the antioxidant and stir until homogeneous; Add tackifying resin, petroleum resin, and plasticizer, and stir until homogeneous; Then add calcium sulfate whiskers, silica fume, and alumina ceramic, and stir until homogeneous; Extrusion and discharge yield adhesive; Apply adhesive to the surface layer to form an adhesive layer; Silicone oil is coated onto the release layer to form a silicone oil layer; The adhesive layer that connects to the surface layer and the silicone oil layer that connects to the release layer are pressed together to obtain the product.

Images