Resin composition for preparing pressure-sensitive adhesive tape

Abstract

The invention discloses a resin composition for preparing a pressure-sensitive adhesive tape and a preparation method of the resin composition. The resin composition comprises acrylate resin, epoxy resin or a mixture of the acrylate resin and the epoxy resin, and at least one plasticizer, such as a plant-based plasticizer, a soybean oil derivative or a low-volatility plasticizer; at least one cross-linking agent, such as an ultraviolet curing cross-linking agent, an olefin cross-linking agent; a functional additive with ultraviolet resistance, such as a light stabilizer and nano titanium dioxide; and other adjuvants, such as a nanofiller and a rare earth metal compound. The resin composition can be used for improving the ultraviolet resistance, weather resistance and mechanical properties of the pressure-sensitive adhesive tape, and adopts environment-friendly materials to reduce VOC emission. The preparation method of the pressure-sensitive adhesive tape comprises the steps of mixing, stirring, vacuum defoaming and curing, high quality and good performance of the adhesive tape are ensured, the service life of the pressure-sensitive adhesive tape can be remarkably prolonged, the environmental protection property of the pressure-sensitive adhesive tape can be remarkably improved, and the requirements of modern green production are met.

Description

Technical Field

[0001] The present invention relates to a resin composition for preparing a pressure-sensitive adhesive tape. Background Art

[0002] As an important adhesive material widely used in industries, daily life, packaging and other fields, the performance of the pressure-sensitive adhesive tape directly affects the use effect. Most traditional pressure-sensitive adhesive tapes use acrylate resins, epoxy resins, etc. as the main components. These resins have good adhesive properties, but there are still some technical defects in actual applications that need to be solved urgently.

[0003] First of all, the existing pressure-sensitive adhesive tapes are prone to aging under ultraviolet irradiation, manifested as problems such as yellowing of color, decline in adhesion performance, and shortening of service life. This defect mainly stems from the lack of effective anti-ultraviolet function in traditional resin compositions, resulting in easy photodegradation of the tape when outdoors or exposed to sunlight for a long time, affecting the long-term use effect of the product. Therefore, how to improve the anti-ultraviolet ability of the pressure-sensitive adhesive tape and extend its weather resistance has become an important technical problem in the preparation of pressure-sensitive adhesive tapes.

[0004] Secondly, the plasticizers in traditional pressure-sensitive adhesive tapes are usually petroleum-based chemicals with relatively high volatility, which may have a certain impact on the environment and human health. With the increasingly strict environmental protection regulations, how to select environmentally friendly and low-volatile plasticizers to improve the performance and environmental adaptability of pressure-sensitive adhesive tapes has become an urgent need for the development of the industry. At present, plant-based plasticizers, soybean oil derivatives, etc. as sustainable materials have gradually attracted attention, but the performance stability and processing adaptability of these materials in actual applications still need to be further optimized.

[0005] In addition, the use of crosslinking agents plays a crucial role in the performance of pressure-sensitive adhesive tapes. Traditional crosslinking agents often require a long time or a high temperature during the curing process, resulting in a long production cycle and low production efficiency. Although new crosslinking agents such as ultraviolet light-curing crosslinking agents can improve the curing efficiency, how to ensure the adhesion and temperature resistance of the pressure-sensitive adhesive tape while maintaining a short curing time is still a technical problem to be solved.

[0006] Finally, in the existing resin compositions, there is often a lack of appropriate auxiliaries to improve the mechanical properties of the tape, especially in terms of abrasion resistance, tear resistance and tensile strength, which are easily affected by the use environment. Adding an appropriate amount of auxiliary agents such as nano-fillers or rare earth metal compounds can effectively enhance the physical properties of the tape and improve its service life and durability, but the reasonable ratio of these components and their influence on the resin properties still need to be further studied.

[0007] Therefore, the main defects in the current technology include insufficient ultraviolet aging resistance, non-environmentally friendly selection of plasticizers, low curing efficiency of crosslinking agents, and unsatisfactory physical properties of the tape. These problems restrict the further development and application of pressure-sensitive tapes. To solve these problems, there is an urgent need to develop a new type of resin composition. By optimizing the resin formulation, adding environmentally friendly plasticizers, using highly efficient crosslinking agents, introducing ultraviolet-resistant functional additives, and appropriate auxiliary agents, the comprehensive performance of the pressure-sensitive tape can be improved to meet the needs of the modern market. Summary of the Invention

[0008] The object of the present invention is to provide a resin composition for preparing a pressure-sensitive tape. By carefully designing and rationally proportioning each component, multiple technical problems such as the weather resistance, environmental friendliness, processing performance, and physical properties of the pressure-sensitive tape are solved, thereby improving the comprehensive performance and market competitiveness of the pressure-sensitive tape.

[0009] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0010] A resin composition for preparing a pressure-sensitive tape, the resin composition comprising the following components:

[0011] The main component is acrylate resin, epoxy resin or a mixture thereof, and the mass ratio of the resin is 50-90%;

[0012] At least one plasticizer selected from plant-based plasticizers, soybean oil derivatives, low-volatility plasticizers or combinations thereof, and the mass ratio of the plasticizer is 5-30%;

[0013] At least one crosslinking agent, the crosslinking agent being an ultraviolet-curable crosslinking agent, an olefin-based crosslinking agent or a combination thereof, and the mass ratio of the crosslinking agent is 0.5-10%;

[0014] A functional additive with ultraviolet resistance, the functional additive with ultraviolet resistance being a light stabilizer, nano-titanium dioxide or a combination thereof, and the mass ratio of the functional additive with ultraviolet resistance is 0.1-5%;

[0015] Other auxiliary agents, including nano-fillers, rare earth metal compounds, etc., and the mass ratio of the auxiliary agents is 0.1-10%.

[0016] Preferably, the molecular weight of the styrene-butadiene copolymer is between 200,000 and 500,000.

[0017] Preferably, the crosslinking agent is triisocyanate, and the mass ratio of the triisocyanate is 0.5-5%.

[0018] Preferably, the plasticizer is a cycloolefin compound, and the cycloolefin compound is selected from epoxides and cycloolefin resins.

[0019] Preferably, the functional additive with anti-ultraviolet performance is molybdate, and the mass ratio of the molybdate is 0.5-2%.

[0020] Another technical problem to be solved by the present invention is to provide a method for preparing a pressure-sensitive tape using the resin composition as described above, comprising the following steps:

[0021] Mix an acrylate resin, an epoxy resin or a mixture thereof with a plasticizer to obtain a resin base material;

[0022] Add a crosslinking agent to the resin base material and stir evenly at room temperature or under heating conditions;

[0023] Add the functional additive with anti-ultraviolet performance and other auxiliary agents to the resin base material, and continue to stir evenly to obtain a uniform resin composition;

[0024] Perform vacuum degassing treatment on the resin composition to remove the bubbles therein;

[0025] Coat the obtained resin composition on a substrate and cure or dry it to obtain a pressure-sensitive tape.

[0026] Preferably, in step 1), the mass ratio of the mixture of the acrylate resin and the plasticizer is 50-80%:20-50%; in step 2), the crosslinking agent is an ultraviolet curable crosslinking agent or an olefin crosslinking agent, and the addition amount of the crosslinking agent is 0.5-10%.

[0027] Preferably, in step 3), the functional additive with anti-ultraviolet performance is a light stabilizer or nano-titanium dioxide, and the addition amount is 0.1-5%; in step 4), the vacuum degassing treatment is carried out under a vacuum condition of -0.1 to -0.8 MPa for 10-30 minutes.

[0028] Preferably, in step 5), the curing or drying temperature is 60-120 °C, and the curing or drying time is 1-5 hours

[0029] Another technical problem to be solved by the present invention is to provide a pressure-sensitive tape, and the adhesive layer of the pressure-sensitive tape uses the resin composition as described above.

[0030] The beneficial effects of the present invention are:

[0031] Traditional pressure-sensitive tapes are prone to aging, yellowing in color, and performance degradation when exposed to ultraviolet (UV) light during use. By adding functional additives with UV resistance properties (such as light stabilizers, nano-titanium dioxide, etc.), the weather resistance of the tape can be effectively improved, its service life extended, and photo-degradation caused by UV light prevented. By selecting environmentally friendly materials such as plant-based plasticizers, soybean oil derivatives, and low-volatility plasticizers as plasticizers, not only the flexibility and adhesiveness of the tape are improved, but also the emissions of volatile organic compounds in the tape are reduced, meeting environmental protection requirements and reducing the negative impact on the environment.

[0032] By using crosslinking agents such as UV-curable crosslinking agents or olefin crosslinking agents, the resin composition can be cured by UV light or olefin crosslinking in a short time, improving the curing efficiency, reducing the production cycle, and at the same time enhancing the adhesion and heat resistance of the pressure-sensitive tape. By adding auxiliary agents such as nano-fillers and rare earth metal compounds, the mechanical properties of the tape can be enhanced, such as tensile strength, tear resistance, and abrasion resistance, improving the overall quality and performance of the pressure-sensitive tape. By precisely controlling the mass ratios of acrylate resins, epoxy resins, plasticizers, crosslinking agents, UV-resistant additives, and other auxiliary agents, the comprehensive performance of the pressure-sensitive tape can be optimized as needed to achieve better adhesion, flexibility, UV resistance, and durability. Specific implementation methods

[0034] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] Example 1

[0037] A resin composition for preparing a pressure-sensitive tape, mainly composed of acrylate resin, using a UV-curable crosslinking agent and a low-volatility plasticizer;

[0038] Component ratio:

[0039] Acrylate resin: 70%, epoxy resin: 20%, plasticizer (plant-based plasticizer): 5%, crosslinking agent (UV-curable crosslinking agent): 2%, UV-resistant functional additive (light stabilizer): 1%, auxiliary agent (nano-titanium dioxide): 2%.

[0040] Preparation method:

[0041] Mix acrylate resin and epoxy resin in a mass ratio, and add a plant-based plasticizer (soybean oil derivative) to obtain a resin base material;

[0042] Add an ultraviolet curable crosslinking agent to the resin base material and stir evenly;

[0043] Add a light stabilizer (ultraviolet absorber in the light stabilizer formulation) and nano-titanium dioxide, and continue to stir evenly;

[0044] Perform vacuum degassing treatment on the resin composition for 15 minutes under a vacuum condition of -0.4 MPa to remove air bubbles;

[0045] Coat the resin on the substrate and cure it at 60 °C for 3 hours to obtain a pressure-sensitive tape.

[0046] This formulation can achieve good ultraviolet anti-aging performance, effectively extend the service life of the pressure-sensitive tape, and is particularly suitable for application scenarios exposed to sunlight for a long time; due to the use of plant-based plasticizers, the volatilization of petroleum-based plasticizers is reduced, meeting environmental protection requirements, while maintaining good adhesion performance; after ultraviolet curing, the adhesive force of the pressure-sensitive tape is stable, and it shows strong durability in high-temperature or high-humidity environments.

[0047] Example 2:

[0048] A resin composition for preparing a pressure-sensitive tape, mainly composed of epoxy resin, using an olefin crosslinking agent and a cycloolefin plasticizer;

[0049] Component ratio:

[0050] Acrylate resin: 50%, epoxy resin: 30%, plasticizer (cycloolefin compound): 10%, crosslinking agent (olefin crosslinking agent): 5.5%, anti-ultraviolet functional additive (molybdate): 1.5%, auxiliary agent (nano filler): 3%.

[0051] Preparation method:

[0052] Mix acrylate resin and epoxy resin in a mass ratio, and add a cycloolefin plasticizer (cycloolefin resin) to obtain a resin base material.

[0053] Add an olefin crosslinking agent (diene crosslinking agent), and stir evenly under the condition of heating to 60 °C.

[0054] Add an anti-ultraviolet functional additive (molybdate) and nano filler, and continue to stir until uniform.

[0055] Perform vacuum degassing treatment for 20 minutes under the condition of -0.6 MPa.

[0056] After being coated on the substrate, the curing temperature is 100 °C and the curing time is 4 hours to obtain the pressure-sensitive tape.

[0057] The cycloolefin plasticizer provides excellent low-temperature flexibility, and its cycloolefin structure can also improve the heat resistance of the pressure-sensitive tape; the olefin cross-linking agent can cross-link rapidly under low-temperature conditions, significantly improving the production efficiency; this formulation has good UV stability and the weather resistance of the tape is enhanced by the addition of molybdate, making it particularly suitable for outdoor use; the added nano-fillers effectively improve the physical strength of the tape, and the tensile strength and wear resistance are significantly improved.

[0058] Example 3:

[0059] A resin composition for preparing a pressure-sensitive tape, in which an acrylate resin is mixed with an epoxy resin, and a triisocyanate cross-linking agent and a low-volatility plasticizer are used

[0060] Ingredient ratio:

[0061] Acrylate resin: 60%, epoxy resin: 20%, plasticizer (low-volatility plasticizer): 15%, cross-linking agent (triisocyanate): 3%, anti-UV functional additive (light stabilizer): 1%, auxiliary agent (rare earth metal compound): 1%.

[0062] Preparation method:

[0063] Mix the acrylate resin and the epoxy resin in proportion, and add a low-volatility plasticizer to obtain a resin base material;

[0064] Add the triisocyanate cross-linking agent to the resin base material and stir evenly;

[0065] Add the light stabilizer and the rare earth metal compound, and continue to stir until evenly mixed;

[0066] Perform vacuum degassing treatment on the resin composition for 12 minutes under the condition of -0.3 MPa;

[0067] Coat it on the substrate and carry out curing or drying, with the temperature controlled at 120 °C and the drying time being 3 hours.

[0068] Using triisocyanate as the cross-linking agent enables the tape to cure rapidly at a lower temperature, greatly shortening the production cycle; the low-volatility plasticizer can effectively reduce volatiles, improving environmental protection and safety, while maintaining good flexibility and adhesion; this formulation performs excellently in terms of anti-UV ability, and the use of a light stabilizer significantly improves the durability of the tape, making it suitable for applications exposed to UV environments for a long time; the addition of rare earth metal compounds enhances the heat resistance and mechanical strength of the tape, ensuring that it can still maintain good performance in high-temperature environments.

[0069] Example 4:

[0070] A resin composition for preparing a pressure-sensitive tape, a pressure-sensitive tape using an ultraviolet light-curing crosslinking agent and a soybean oil derivative plasticizer;

[0071] Component ratio:

[0072] Acrylic resin: 80%, epoxy resin: 10%, plasticizer (soybean oil derivative): 6%, crosslinking agent (ultraviolet light-curing crosslinking agent): 2%, anti-ultraviolet functional additive (light stabilizer): 1%, auxiliary agent (nano filler): 1%.

[0073] Preparation method:

[0074] Mix the acrylic resin and the epoxy resin in proportion, add the soybean oil derivative as the plasticizer, and stir evenly to obtain a resin base material;

[0075] Add the ultraviolet light-curing crosslinking agent to the resin base material, stir evenly, and ensure that the crosslinking agent is completely dissolved;

[0076] Add the light stabilizer and the nano filler, continue to stir, and ensure that all components are evenly mixed;

[0077] Perform vacuum degassing on the mixture, use a vacuum condition of -0.5 MPa, and the degassing time is 20 minutes;

[0078] Coat the obtained resin composition on a substrate, and use ultraviolet light-curing technology for curing. The curing time is 10 minutes, and the curing temperature is 80 °C to obtain a pressure-sensitive tape.

[0079] Using the soybean oil derivative as the plasticizer effectively reduces the use of petroleum-based plasticizers and meets the green environmental protection standards; the combination of the ultraviolet light-curing crosslinking agent and the light stabilizer makes the tape have excellent anti-ultraviolet performance and is suitable for use in outdoor or sunlight-exposed environments; the added nano filler improves the tensile strength and wear resistance of the tape and increases its durability under high loads; using the ultraviolet light-curing crosslinking technology, the tape cures quickly, has high production efficiency, and the cured tape has good adhesiveness and stable use.

[0080] Example 5:

[0081] A resin composition for preparing a pressure-sensitive tape, a pressure-sensitive tape using a triisocyanate crosslinking agent and a cycloolefin compound plasticizer;

[0082] Component ratio:

[0083] Acrylic resin: 60%, epoxy resin: 20%, plasticizer (cycloolefin compound): 14%, crosslinking agent (triisocyanate): 4%, anti-ultraviolet functional additive (molybdate): 1%, auxiliary agent (rare earth metal compound): 1%.

[0084] Preparation method:

[0085] Mix the acrylic resin and epoxy resin according to the mass ratio, add the cycloolefin compound as a plasticizer, and stir evenly to obtain a resin base material;

[0086] Add the triisocyanate crosslinking agent to the resin base material and continue stirring to ensure uniform fusion of the crosslinking agent and the resin;

[0087] Add molybdate as an anti-ultraviolet functional additive and add rare earth metal compounds to improve the heat resistance of the material, and continue stirring evenly;

[0088] Perform vacuum degassing treatment on the resin composition for 15 minutes under a vacuum condition of -0.3 MPa to ensure the removal of bubbles;

[0089] Coat the resin on the substrate and cure it at 120 °C for 4 hours to obtain a pressure-sensitive tape.

[0090] The use of the cycloolefin compound plasticizer improves the high-temperature resistance of the tape and is suitable for bonding applications in high-temperature environments; the addition of the triisocyanate crosslinking agent enables the tape to crosslink quickly at a lower temperature, enhancing the production efficiency and the stability of the tape; molybdate as an anti-ultraviolet functional additive significantly improves the weather resistance of the tape under direct sunlight; the combination of the plasticizer and rare earth metal compounds improves the flexibility, adhesion performance and tensile strength of the tape, enhancing the overall durability of the tape.

[0091] Experimental examples

[0092] Verify the advantages of the pressure-sensitive tapes prepared in Examples 1-5 compared with traditional pressure-sensitive tapes in terms of improving performance, environmental friendliness, curing efficiency, physical properties, etc., especially the performance in anti-ultraviolet, environmental sustainability, processing performance and physical properties.

[0093] Test materials:

[0094] Existing common pressure-sensitive tapes as the control group

[0095] The pressure-sensitive tapes of Examples 1 to 5

[0096] Experimental steps:

[0097] UV Weather Resistance Test: Expose each tape sample to a UV lamp for UV aging test (irradiation for 24 hours), and record the color change (yellowing index) and adhesion performance change of the tape.

[0098] Environmental Friendliness Test: Determine the volatile organic compound (VOC) content of each tape and compare them. Analyze the tape samples using gas chromatography (GC).

[0099] Curing Efficiency Test: Measure the curing time and curing effect of each tape under UV curing or thermal curing. Record the bonding strength of the tape after curing.

[0100] Physical Property Test: Test the physical properties of each tape such as tensile strength, tear resistance, and abrasion resistance.

[0101] Analysis of Environmentally Friendly Materials: Analyze whether the plasticizers and crosslinking agents used in the tape meet environmental protection standards and compare them with traditional tapes.

[0102]

[0103] Result Analysis:

[0104] The tapes of Examples 1 - 5 have significantly lower yellowing indices compared to traditional tapes, indicating that they have stronger UV resistance under UV irradiation. These tapes can effectively reduce photo - degradation caused by UV rays, thereby extending the service life; the tapes in all examples have much lower VOC contents than existing tapes, especially Examples 1 and 4 with the lowest VOC contents, indicating that the plant - based plasticizers and low - volatility plasticizers used in them meet environmental protection requirements and reduce the emission of harmful substances.

[0105] The tapes in Examples 1 - 5 have significantly shorter curing times under UV curing or olefin cross - linking curing. Compared with the 8 - minute curing time of traditional tapes, the shortest is only 3 minutes. This indicates that they have higher curing efficiency, which helps to improve production efficiency; the tapes in all examples show significant improvements in tensile strength, tear resistance, and abrasion resistance compared to traditional tapes, especially Examples 4 and 2, which perform best in these aspects. These improvements enhance the mechanical properties of the tapes and make them more durable in practical applications.

[0106] All examples use environmentally friendly materials to varying degrees. The plant - based and low - volatility characteristics of the plasticizers not only improve the flexibility and adhesion performance of the tapes but also help to reduce the negative impact on the environment.

[0107] Examples 4 and 2 have the highest proportions of environmentally friendly materials used, indicating stronger sustainability.

[0108] The above embodiments of the present invention do not limit the protection scope of the present invention. The implementation manners of the present invention are not limited thereto. All such modifications, substitutions or changes in various other forms made to the above structure of the present invention according to the above content of the present invention, in accordance with the common general technical knowledge and customary means in the art, without departing from the above basic technical idea of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A resin composition for preparing a pressure-sensitive adhesive tape, characterized in that: The resin composition comprises the following components: The main components are acrylic resin, epoxy resin or a mixture thereof, and the mass ratio of the resin is 50-90%; At least one plasticizer, the plasticizer is selected from plant-based plasticizers, soybean oil derivatives, low volatility plasticizers or combinations thereof, and the mass ratio of the plasticizer is 5-30%; At least one cross-linking agent, wherein the cross-linking agent is a UV curing cross-linking agent, an olefin cross-linking agent or a combination thereof, and the mass ratio of the cross-linking agent is 0.5-10%; A functional additive with anti-ultraviolet performance, wherein the functional additive with anti-ultraviolet performance is a light stabilizer, nano titanium dioxide or a combination thereof, and the mass ratio of the functional additive with anti-ultraviolet performance is 0.1-5%; Other auxiliary agents include nano fillers, rare earth metal compounds, etc., and the mass ratio of the auxiliary agents is 0.1-10%.

2. The resin composition for preparing a pressure-sensitive adhesive tape according to claim 1, characterized in that: The molecular weight of the styrene-butadiene copolymer is between 200,000 and 500,000.

3. The resin composition for preparing a pressure-sensitive adhesive tape according to claim 1, characterized in that: The cross-linking agent is triisocyanate, and the mass ratio of the triisocyanate is 0.5-5%.

4. The resin composition for preparing a pressure-sensitive adhesive tape according to claim 1, characterized in that: The plasticizer is a cycloolefin compound, and the cycloolefin compound is selected from epoxides and cycloolefin resins.

5. The resin composition for preparing a pressure-sensitive adhesive tape according to claim 1, characterized in that: The functional additive with anti-ultraviolet performance is molybdate, and the mass proportion of the molybdate is 0.5-2%.

6. A method for preparing a pressure-sensitive adhesive tape using the resin composition according to any one of claims 1 to 5, characterized in that: The following steps are involved: Mixing an acrylic resin, an epoxy resin or a mixture thereof with a plasticizer to obtain a resin base material; Add a crosslinking agent to the resin base and stir evenly at room temperature or under heating conditions; Adding functional additives with UV resistance and other auxiliary agents to the resin base material, and continuing to stir evenly to obtain a uniform resin composition; Performing vacuum degassing on the resin composition to remove bubbles therein; The obtained resin composition is coated on a substrate, and then cured or dried to obtain a pressure-sensitive adhesive tape.

7. The method for preparing a pressure-sensitive adhesive tape according to claim 6, characterized in that: The mass ratio of the mixture of the acrylic resin and the plasticizer in step 1) is 50-80%:20-50%; the crosslinking agent in step 2) is a UV curing crosslinking agent or an olefin crosslinking agent, and the amount of the crosslinking agent added is 0.5-10%.

8. The method for preparing a pressure-sensitive adhesive tape according to claim 6, characterized in that: The functional additive with anti-ultraviolet performance in step 3) is a light stabilizer or nano titanium dioxide, and the addition amount is 0.1-5%; the vacuum degassing treatment in step 4) is carried out under a vacuum condition of -0.1 to -0.8MPa for 10-30 minutes.

9. The method for preparing a pressure-sensitive adhesive tape according to claim 6, characterized in that: The curing or drying temperature in step 5) is 60-120° C., and the curing or drying time is 1-5 hours.

10. A pressure-sensitive adhesive tape, characterized in that: The adhesive layer of the pressure-sensitive adhesive tape adopts the resin composition according to any one of claims 1 to 5.

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