Rat-bite-proof UV (ultraviolet) hot-melt cloth-based harness adhesive tape as well as preparation method and application thereof

Abstract

The invention relates to the technical field of wire harness adhesive tapes, and discloses a rat-bite-proof UV hot melt cloth-based wire harness adhesive tape as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) modifying a base cloth with alkali liquor: putting a polyester fiber base cloth into a sodium hydroxide solution for pretreatment, neutralizing with an acetic acid solution, and sequentially carrying out water ultrasonic cleaning, optimized solvent washing and drying; (2) cloth-based grafting: uniformly mixing capsaicin, a silane coupling agent, an organic bismuth catalyst and an ethanol water solution, adding the mixture obtained in the step (1) into the mixture, soaking for several minutes, and then heating for addition reaction; (3) compounding an adhesive layer: heating and melting an acrylic acid type UV hot melt adhesive, adding a rat-bite-proof composite additive, uniformly mixing, and naturally cooling to room temperature; and (4) coating and curing. The addition amount of the rat-bite-proof additive for the adhesive layer is less than 0.4%, the stripping force of the adhesive tape is greater than or equal to 3.0 N / cm while the rat-bite-proof performance is ensured, the lasting adhesion at 80 DEG C is greater than 24 hours, cohesive failure is avoided, and the rat-bite-proof performance and the adhesive property are both considered.

Description

Technical Field

[0001] This invention relates to the field of wire harness tape technology, specifically to a rodent-proof UV hot melt fabric wire harness tape, its preparation method, and its application. Background Technology

[0002] As is well known, rodents gnawing on pipes, wiring, and other objects can easily cause leaks, short circuits, and other safety accidents, resulting in significant economic losses. Therefore, the research and development of rodent-proof materials has led to their widespread application across various industries.

[0003] There are existing literature reports that adding appropriate amounts of capsaicin and bittering agents to PVC can effectively repel rodents (Laongdaw Techawinyutham and Rapeephun Dangtungee, Anti-Rodent PolymerComposites Key Engineering Materials, Key Engineering Materials, 818 (2019) 1-6). However, the traditional approach of adding capsaicin to a single adhesive layer to improve the material to prevent rodent bites has some shortcomings: (1) There is an inherent contradiction between the amount of capsaicin added and the adhesive layer bonding strength. Excessive addition can easily damage the internal compatibility of the adhesive layer, resulting in a sharp reduction in bonding performance, making it difficult to meet the dual requirements of rodent protection and structural fixation; (2) Ethanol is often used as a washing solvent in the pretreatment stage of the fabric base. This solvent can easily cause swelling damage to the polyester fiber fabric, resulting in a decrease in its tensile strength of 15-20%, which seriously weakens the structural stability of the product.

[0004] According to reported patent findings, none of their technical solutions address the two-stage modification design of "cloth base + adhesive layer," nor do they conduct optimization research on the 130g polyester cloth base washing solvent, thus failing to simultaneously solve the aforementioned technical challenges. Therefore, developing a rodent-resistant cloth base tape with long-lasting repellency, excellent adhesive strength, and reliable structural stability has become a pressing technical bottleneck in this field. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a rodent-resistant UV hot-melt fabric base bundle adhesive tape, its preparation method, and its application. Through the design of fabric base alkali treatment modification, fabric base grafting pretreatment, and adhesive layer compounding, the hydroxyl content on the surface of the polyester fiber fabric base is increased to enhance grafting activity, thereby achieving comprehensive and uniform distribution and long-term release of rodent-resistant composite additives in the tape, simultaneously improving repellency stability, durability, and adhesion performance, and meeting the protection needs of multiple scenarios.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape, characterized in that: the preparation method includes the following steps: (1) Alkali-modified fabric: At 55~75℃, 130g of polyester fiber fabric is pretreated in 0.25mol / L sodium hydroxide solution for 20~35min, neutralized to pH=7.0 by 0.2~0.3mol / L acetic acid solution, and then ultrasonically cleaned with water, washed with optimized solvent, and dried. (2) Cloth grafting: After mixing capsaicin, silane coupling agent, organic bismuth catalyst and 70% volume concentration of ethanol aqueous solution evenly, add step (1) into it, and soak at 50~60℃ for 20~30min. Then, under ultrasonic conditions, heat to carry out addition reaction. After the reaction is completed, take it out and dry it for later use. (3) Adhesive layer compounding: After heating and melting the acrylic UV hot melt adhesive at 140~160℃, add 0.1%~0.4% rodent-proof composite additive, continue stirring for 40~60min, and cool to room temperature after uniform mixing; (4) Coating and curing: At 140~155℃, the composite adhesive from step (3) is coated through a slit and then coated on the surface of step (2). After curing by UV-C lamp irradiation, it is rolled up to obtain the final product.

[0007] Preferably, in step (1), the number of ultrasonic cleaning cycles is 3 to 5, the time is 5 to 10 minutes, the power is 200 to 400 W, the drying process parameters are 80 to 100°C, the time is 50 to 75 minutes, and the optimized solvent is isopropanol or ethyl acetate.

[0008] Preferably, the mass percentages of capsaicin, silane coupling agent, organobismuth catalyst, and ethanol aqueous solution in step (2) are 2.0~4.0%: 1.0~2.5%: 0.3~0.5%: 80~95%, respectively.

[0009] Preferably, the silane coupling agent in step (2) is γ-methacryloyloxypropyltrimethoxysilane.

[0010] Preferably, the organic bismuth catalyst in step (2) is BiCat8108 with a purity ≥98%.

[0011] Preferably, the reaction temperature of the addition reaction in step (2) is 90~120℃ and the time is 25~35min.

[0012] Preferably, the rodent-proof compound additive in step (3) is a mixture of capsaicin and capsaicin, with a mass ratio of capsaicin to capsaicin of 1:2.

[0013] Preferably, in step (4), the irradiance of the UV-C lamp source is 60~120mJ / cm², the coating line speed is 15~25m / min, and the adhesive layer thickness is 90~95μm.

[0014] The present invention also provides a rodent-proof UV hot melt fabric wire harness tape prepared by the above method, which can be applied to the rodent-proof protection of automotive wire harnesses, transportation cables, and household cables and pipes.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The two-stage modification design of the present invention allows the tape to withstand 50°C. It can still pass the rodent bite test after 30 days of aging, and its repellency durability is ≥30 days better than the single-layer adhesive modification solution; (2) The present invention uses isopropanol / ethyl acetate as a washing solvent, and the tensile strength of polyester fabric is reduced by less than 5%, which significantly improves the structural stability of the fabric compared with the single ethanol washing scheme (the reduction is greater than 20%). (3) The amount of rodent-proof additive added to the adhesive layer of the present invention is <0.4%. While ensuring the rodent-proof performance, the peel force of the tape is ≥3.0N / cm, the adhesion at 80℃ is >24h, and there is no cohesive failure, thus achieving a balance between rodent-proof performance and adhesion performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the rodent-proof UV hot melt fabric baseline bundle adhesive tape of the present invention; Figure 2 Diagram of the grafting mechanism of burkin grafting. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 (1) Alkali-modified fabric: At 60℃, 130g of polyester fiber fabric was placed in a 0.25mol / L sodium hydroxide solution (200mL) for 28min pretreatment. Then, 220mL of acetic acid solution (0.25mol / L) was added to neutralize the pH to neutral (7.0). Then, it was washed in water using ultrasonic method (power 230W, frequency 40kHz, the same below) to remove residues. Next, it was ultrasonically washed in isopropanol solvent for 13min. Finally, it was dried (40℃). 12h); (2) Grafting with Brønsted base: Weigh 7.3g capsaicin, 4.87g silane coupling agent KH570, 230g ethanol aqueous solution (volume concentration 70%) and 1.22g BiCat8108 and mix them evenly in a glass flask. Then add the mixture from step (1) and soak it at 60℃ for 25min. Then react it at 105℃ for 30min under ultrasonic conditions. After the reaction is completed, take it out and dry it (temperature 90℃, time 20min) for later use. (3) Adhesive layer compounding: Weigh 100g of acrylic UV hot melt adhesive and place it in a stainless steel bottle. Heat it at 140℃ for 50min. Then add 0.1g of capsaicin compound (0.033g capsaicin + 0.067g capsaicin extract) and continue stirring for 50min. Then take it out and let it cool naturally to room temperature. (4) Coating: At 150°C, the acrylic UV-curable hot melt adhesive obtained in step (3) is sprayed through a slit onto the 130g polyester fabric substrate (adhesive layer thickness 90~95μm), and then exposed to a UV-C lamp source (electrodeless mercury lamp, 254nm, energy 85mJ / cm). 2 After irradiation, the adhesive surface is cured, and then it is wound up to obtain the rodent-proof acrylic UV hot melt cloth baseline tape.

[0019] Performance tests: (1) Peel strength test refers to GB / T 2792-2014 (parallel tests were performed 3 times, and the average value was taken); (2) Holding power test refers to GB / T 4851-2014; (3) Fabric tensile strength test refers to DIN EN 14410 (the tensile strength test direction is longitudinal); (4) Wire wrapping test refers to LV-312; (5) Rodent bite resistance test refers to GB / T 34016-2017 (Note: the bite penetration judgment standard is "the tape substrate shows a damage of ≥1mm", and no damage is recorded as pass after 14 days of testing); (6) Aging performance test (50℃) Tested for rodent resistance at 10, 20, and 30 days. Example 2 This Example 2 is basically the same as Example 1, except that isopropanol in step (1) is replaced with ethyl acetate, and the rest is the same; Example 3 Example 3 is basically the same as Example 1, except that the amount of rodent-repellent additive in step (3) is increased from 0.1% to 0.4%, and the rest is the same.

[0020] Comparative Example 1 Comparative Example 1 is basically the same as Example 1, except that the rodent-repellent additive capsaicin compound in step (3) is replaced with a bittering agent, and the rest is the same. Comparative Example 2 Comparative Example 2 is basically the same as Example 1, except that the 130g polyester fabric in step (1) is replaced with grafted modified fabric that has not been treated with alkali solution. The rest is the same. Comparative Example 3 Comparative Example 3 is basically the same as Example 1, except that the rodent-proof additive in step (3) is removed, and the rest is the same; Comparative Example 4 Comparative Example 4 is basically the same as Example 1, except that steps (1) and (2) are changed to directly immersing the cloth base in the solution without alkali treatment and grafting modification, otherwise the same.

[0021] Comparative Example 5 Comparative Example 5 is basically the same as Example 1, except that isopropanol in step (1) is replaced with ethanol, and the rest is the same. The tape properties data presented in Example 1 and Comparative Examples 1-5 of this application are shown below: Table 1 shows the performance test results of the tape: Note: The tensile strength of the unwashed polyester fabric is 247 MPa; pass means passed, NA means not tested.

[0022] According to the test results, Comparative Examples 1-3 found that the cloth base and / or adhesive layer, after modification or the addition of rodent repellent, could meet the 14-day rodent-proof requirement without 50℃ treatment. However, after appropriate 50℃ aging treatment, different results were observed. For example, (1) when the adhesive layer additive in Comparative Example 1 was changed to bitterness, it was bitten through in 2 days, indicating that the bitterness agent could not prevent rodent bites; (2) after 20 days of 50℃ placement test, Comparative Examples 2 and 4 were bitten through in 3 days and 8 days respectively. It is speculated that a small amount of capsaicin compound in the adhesive layer volatilized, resulting in insufficient concentration and thus being bitten through; 3) Comparative Example 3, after a 30-day placement test at 50°C, showed that it was bitten through after 5 days. Examples 1-2, using a "cloth-based modification + adhesive layer compound" staged modification design, did not show any bite damage at 50°C for 30 days, and the tape surface showed no tooth marks, thus meeting the rodent-proof design requirements. In Example 3, the capsaicin content in the adhesive layer exceeding 0.4% showed a tendency for cohesive destructive effects. Comparative Example 5, after washing with ethanol, showed a significant decrease in tensile strength and elongation at break, indicating that ethanol easily causes swelling damage to the cloth base, while isopropanol effectively protects the stability of the cloth base structure. Furthermore, the 180° peel force at 50°C... After 30 days, the adhesiveness decreased slightly, but this is not a problem, and the thread wrapping is still fine.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape, characterized in that: The preparation method includes the following steps: (1) Alkali-modified fabric: At 55~75℃, 130g of polyester fiber fabric is pretreated in 0.25mol / L sodium hydroxide solution for 20~35min, neutralized to pH=7.0 by 0.2~0.3mol / L acetic acid solution, and then ultrasonically cleaned with water, washed with optimized solvent, and dried. (2) Cloth grafting: After mixing capsaicin, silane coupling agent, organic bismuth catalyst and 70% volume concentration of ethanol aqueous solution evenly, add step (1) into it, and soak at 50~60℃ for 20~30min. Then, under ultrasonic conditions, heat to carry out addition reaction. After the reaction is completed, take it out and dry it for later use. (3) Adhesive layer compounding: After heating and melting the acrylic UV hot melt adhesive at 140~160℃, add 0.1%~0.4% rodent-proof composite additive, continue stirring for 40~60min, and let it cool naturally to room temperature after uniformity; (4) Coating and curing: At 140~155℃, the composite adhesive from step (3) is coated through a slit and then coated on the surface of step (2). After curing by UV-C lamp irradiation, it is rolled up to obtain the final product.

2. The method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape according to claim 1, characterized in that: In step (1), the ultrasonic cleaning with water is performed 3 to 5 times, for 5 to 10 minutes, with a power of 200 to 400 W. The drying process parameters are 38 to 45°C and 10 to 15 hours. The optimized solvent is isopropanol or ethyl acetate.

3. The method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape according to claim 1, characterized in that: In step (2), the mass percentages of capsaicin, silane coupling agent, organobismuth catalyst, and ethanol aqueous solution are 2.0~4.0%: 1.0~2.5%: 0.3~0.5%: 80~95%, respectively.

4. The method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape according to claim 1, characterized in that: The silane coupling agent in step (2) is γ-methacryloxypropyltrimethoxysilane.

5. The method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape according to claim 1, characterized in that: The organic bismuth catalyst in step (2) is BiCat8108 with a purity ≥98%.

6. The method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape according to claim 1, characterized in that: The addition reaction in step (2) is carried out at a temperature of 90-120°C for 25-35 minutes.

7. The method for preparing a rodent-proof UV hot-melt fabric baseline bundle adhesive tape according to claim 1, characterized in that: The rodent-proof compound additive in step (3) is a mixture of capsaicin and capsaicin, with a mass ratio of capsaicin to capsaicin of 1:

2.

8. The method for preparing a rodent-proof UV hot-melt fabric baseline tape according to claim 1, characterized in that: In step (4), the irradiance of the UV-C lamp source is 60~120mJ / cm², the coating line speed is 15~25m / min, and the adhesive layer thickness is 90~95μm.

9. The rodent-proof UV hot melt fabric baseline tape prepared by the method of any one of claims 1-8.

10. The application of the tape according to claim 9, characterized in that, Applications include rodent-proof protection for automotive wiring harnesses, transportation cables, and household cables and conduits.

Images