High-temperature-resistant rodent-bite-resistant cloth base thread bundle adhesive tape and preparation method thereof

Abstract

The present application relates to the technical field of wire harness tape, and discloses a high-temperature-resistant and rat-bite-resistant cloth-based wire harness tape and a preparation method thereof.The tape comprises a cloth-based substrate and an adhesive layer coated on the cloth-based substrate, and the adhesive layer is prepared from raw materials comprising a liquid main body resin, a thermal crosslinking agent and porous ring-based coated capsaicin;the capsaicin in the porous ring-based coated capsaicin contains phenolic hydroxyl groups, and in the curing process of the adhesive layer, the isocyanate groups in the thermal crosslinking agent and the phenolic hydroxyl groups of the capsaicin molecules undergo a chemical crosslinking reaction, and the capsaicin is anchored in the adhesive network in the form of a covalent bond.The prepared cloth-based wire harness tape has excellent high-temperature resistance, rat resistance and adhesion, and is suitable for wire harness protection in high-temperature environments such as automobile engine compartments, and can also be used in fields requiring rat protection such as power cables and communication optical cables.

Description

Technical Field

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

[0002] Fabric-lined wire harness tape is widely used in the automotive, aerospace, and rail transportation industries for bundling and protecting wire harnesses, providing functions such as wire bundling, insulation protection, and sound absorption and noise reduction. With the development of the automotive industry, different functional parts place higher demands on the temperature resistance of wire harness tapes. The highest application temperature in the automotive engine compartment can reach 140℃. According to the MBN LV312-1 standard, wire harness tapes must maintain stable performance after continuous aging at 125℃ for 3000 hours.

[0003] Currently, there are high-temperature resistant wire harness tapes on the market that can meet the long-term temperature resistance requirement of 125℃, but they generally lack effective rodent-proof functions. Rodent chewing on wire harnesses is a long-standing technical problem in the fields of cables, optical cables, and automotive wire harnesses, which can easily cause safety accidents such as short circuits, open circuits, and even fires.

[0004] Existing rodent control technologies are mainly divided into two categories: one is physical barrier methods, which achieve protection by adding anti-bite layers, pointed protrusions, or steel mesh layers. Although this has a certain effect, it increases the thickness and weight of the tape, reduces its flexibility, and cannot fundamentally solve the problem of rodent gnawing. The other category is adding rodent repellents, which directly add rodent repellent ingredients such as capsaicin and actinomycete ketone to the tape material. However, directly adding capsaicin has obvious drawbacks: capsaicin contains phenolic hydroxyl groups, which are easily oxidized and degraded during high-temperature aging, leading to a rapid decline in rodent repellency; uncoated capsaicin has a strong pungent odor, affecting production conditions and user experience.

[0005] Existing patents disclose methods for preparing capsaicin β-cyclodextrin inclusion complexes, primarily for transdermal drug delivery in the pharmaceutical field. There are also reports of its use in marine antifouling coatings, mainly utilizing its sustained-release properties to prolong the antifouling effect, rather than addressing the issue of high-temperature chemical stability. Encapsulating capsaicin with β-cyclodextrin alone still cannot meet the requirements for long-term temperature resistance at 125°C and long-term rodent repellency in automotive wiring harness tapes. Therefore, developing fabric wiring harness tapes that combine high-temperature resistance and long-term rodent repellency is a pressing technical problem to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention aims to provide a high-temperature resistant rodent-proof fabric-based adhesive tape and its preparation method. The present invention employs porous cyclic groups to coat capsaicin, and then combines this coating with hydroxyl resin and isocyanate curing agents. The isocyanate groups undergo a chemical cross-linking reaction with the phenolic hydroxyl groups in the capsaicin molecules, anchoring the capsaicin in the adhesive network through chemical bonding. Simultaneously, the β-cyclodextrin coating structure provides additional thermal protection, thereby significantly improving the stability of capsaicin at high temperatures, achieving a stability up to 150℃. The technology demonstrates that the rodent-repelling performance remains satisfactory even after 14 days of high-temperature aging (10 days).

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant rodent-proof cloth base bundle adhesive tape, comprising a cloth base material and an adhesive layer coated on the cloth base material, wherein the adhesive layer is prepared from raw materials containing the following components: liquid main resin, thermal crosslinking agent and porous cyclic group-coated capsaicin; The capsaicin in the porous cyclic coating contains phenolic hydroxyl groups. During the curing process of the adhesive layer, the isocyanate groups in the thermal crosslinking agent undergo a chemical crosslinking reaction with the phenolic hydroxyl groups of the capsaicin molecules, anchoring the capsaicin in the adhesive network in the form of covalent bonds. The tape still has a repellent effect on rodents after aging at 150°C for 10 days and 14 days.

[0008] Preferably, the raw materials of the adhesive layer include, by weight: 60-100 parts of hydroxyl resin, 0.2-1.2 parts of thermal crosslinking agent, and 5.0-30.0 parts of porous cyclic-coated capsaicin.

[0009] Preferably, the mass ratio of the porous cyclic group to capsaicin in the porous cyclic group-coated capsaicin is (2.0~40.0):1.

[0010] Preferably, the liquid host resin is one of acrylic hydroxyl resin, polyester hydroxyl resin, and polyurethane hydroxyl resin.

[0011] Preferably, the isocyanate curing agent is one of aromatic polyisocyanate and aliphatic polyisocyanate.

[0012] The present invention also provides a method for preparing the above-mentioned high-temperature resistant rodent-proof cloth-based adhesive tape, comprising the following steps: (1) Preparation of capsaicin coating: Mix the porous cyclic group with capsaicin, add solvent, place in an oven at 50-60℃ and heat for 30-60 min until dissolved, and allow the capsaicin solution to enter the cavity of the porous cyclic group under grinding conditions. After vacuum drying, the porous cyclic group coated capsaicin powder is obtained. (2) Preparation of adhesive: Mix hydroxyl resin, thermal crosslinking agent and the porous cyclic group-coated capsaicin powder obtained in step (1), stir evenly, let stand to defoam, and obtain adhesive; (3) Coating: The adhesive obtained in step (2) is coated on the surface of the cloth substrate and dried and cured to obtain the high temperature resistant rodent-proof cloth base bundle tape.

[0013] Preferably, the porous cyclic group in step (1) is selected from one of hydroxypropyl gamma cyclodextrin, sodium sulfobutyl beta-cyclodextrin, hydroxypropyl beta-cyclodextrin, methyl beta-cyclodextrin, alpha cyclodextrin, beta-cyclodextrin, and gamma cyclodextrin; the solvent is selected from ethyl acetate or anhydrous ethanol.

[0014] Preferably, the weight ratio of the hydroxyl resin, isocyanate curing agent and porous cyclic-coated capsaicin powder in step (2) is 100:(0.4-0.6):(6.0-30.0).

[0015] Preferably, the hydroxyl resin solid content in step (2) is 30-80%.

[0016] The high-temperature resistant rodent-proof fabric wire harness tape prepared by the method of this invention can be used for rodent protection of automotive engine compartment wiring harnesses, power cables, or communication optical cables.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) For the first time, porous cyclic coating of capsaicin and isocyanate crosslinking technology were combined and applied to the field of wire harness tape. Through the dual protection mechanism of chemical bonding and physical coating, the high-temperature stability of capsaicin at 150℃ was significantly improved. The tape was tested at 150℃. It retains its excellent rodent-repellent effect even after 10 days of high-temperature aging; (2) The isocyanate group chemically crosslinks with the capsaicin phenolic hydroxyl group, anchoring capsaicin in the adhesive network in the form of covalent bonds, overcoming the defects of easy migration and easy degradation of capsaicin in traditional rodent-proof tape; (3) The porous cyclic coating structure provides thermal protection for capsaicin, improves its dispersibility in adhesive systems, reduces irritating odor during processing and use, and optimizes production conditions; (4) The fabric wire harness tape has excellent high temperature resistance, rodent resistance and adhesion properties. It is suitable for wire harness protection in high temperature environments such as automobile engine compartments, and can also be used in fields such as power cables and communication optical cables that require rodent protection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the high-temperature resistant rodent-proof cloth base bundle adhesive tape of the present invention; Detailed Implementation 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.

[0019] Example 1: (1) Preparation of porous cyclic-coated capsaicin: Weigh 12g of β-cyclodextrin and 2g of capsaicin (purity ≥98%). Dissolve capsaicin in ethyl acetate to prepare a 50% (w / w) capsaicin solution. Heat the solution in a 55℃ oven for 40min until dissolved, resulting in a light brown color. Place the β-cyclodextrin mixture in a grinding pan. During grinding, slowly add the capsaicin solution while stirring. Control the grinding time to 35min to allow the capsaicin to fully enter the β-cyclodextrin cavities and form inclusion complexes. After grinding, vacuum dry the mixture at 40℃ for 6 hours, pulverize and sieve to obtain β-cyclodextrin-coated capsaicin powder.

[0020] (2) Preparation of adhesive: Coat 85g of acrylic hydroxyl resin, 0.42 parts of aromatic polyisocyanate, and 14.2 parts of β-cyclodextrin with capsaicin, add an appropriate amount of solvent, stir evenly, let stand for 30 minutes to defoam, and set aside for use; (3) Coating: Apply the adhesive evenly to the surface of the polyester fabric substrate by scraper coating, control the coating thickness to 200-220μm, dry and cure at 130℃ for 2 minutes, and mature at 50℃ for 2 days. Then roll up and cut to obtain high temperature resistant rodent-proof fabric base bundle adhesive tape.

[0021] Performance tests: (1) Peel strength test refers to GB / T 2792-2014 (parallel tests were conducted 3 times, and the average value was taken); (2) Holding power test refers to GB / T 4851-2014; (3) Wire wrapping test refers to LV-312; (4) Rodent bite test refers to GB / T 34016-2017 (Note: The criterion for bite penetration is "the tape substrate shows a breakage of ≥1mm", and no breakage is recorded as a pass after 14 days of testing); (5) Aging performance test (50℃) 10 days, 80℃ 10 days, 105℃ 10 days, 125℃ 10 days, 150℃ 10-day test for rodent resistance; Example 2: This Example 2 is basically the same as Example 1, except that the ethyl acetate in step (1) is replaced with anhydrous ethanol, and the rest is the same. Example 3: This embodiment 2 is basically the same as embodiment 1, except that the aromatic polyisocyanate in step (2) is replaced with aliphatic polyisocyanate and the acrylic hydroxy resin is replaced with polyester hydroxy resin. The rest are the same. Example 4: This Example 4 is basically the same as Example 1, except that the 14.2 parts of β-cyclodextrin-coated capsaicin in step (2) are changed to 13.5 parts, and the acrylic hydroxyl resin is changed to polyurethane hydroxyl resin. The rest are the same. Example 5: This Example 5 is basically the same as Example 1, except that the amount of β-cyclodextrin-coated capsaicin in step (2) is changed from 14.2 parts to 15.3 parts, and the rest is the same; Example 6: This Example 6 is basically the same as Example 1, except that the 12g of β-cyclodextrin and 2g of capsaicin in step (1) are replaced with 10.0g of β-cyclodextrin and 2g of capsaicin, and the rest are the same; Example 7: This embodiment 7 is basically the same as embodiment 1, except that the 12g of β-cyclodextrin and 2g of capsaicin in step (1) are replaced with 14.0g of β-cyclodextrin and 2g of capsaicin, and the rest are the same; Example 8: This Example 8 is basically the same as Example 1, except that the 12g of β-cyclodextrin in step (1) is replaced with 16.9g of hydroxypropyl gamma cyclodextrin, and the rest are the same; Example 9: This Example 9 is basically the same as Example 1, except that the 12g of β-cyclodextrin in step (1) is replaced with 18.1g of sodium sulfobutyl betacyclodextrin, and the rest is the same; Example 10: This Example 10 is basically the same as Example 1, except that the 12g of β-cyclodextrin in step (1) is replaced with 14.6g of hydroxypropyl betacyclodextrin, and the rest are the same; Example 11: This Example 11 is basically the same as Example 1, except that the 12g of β-cyclodextrin in step (1) is replaced with 13.8g of methylbetacyclodextrin, and the rest are the same; Example 12: This embodiment 12 is basically the same as embodiment 1, except that the 12g of β-cyclodextrin in step (1) is replaced with 10.4g of alpha-cyclodextrin, and the rest are the same; Example 13: This embodiment 13 is basically the same as embodiment 1, except that the 12g of β-cyclodextrin in step (1) is replaced with 13.8g of gamma-cyclodextrin, and the rest are the same; Comparative Example 1: Comparative Example 1 is basically the same as Example 1, except that the 12g of β-cyclodextrin and 2g of capsaicin in step (1) are replaced with 6.0g of β-cyclodextrin and 2g of capsaicin, and the rest are the same; Comparative Example 2: Comparative Example 2 is basically the same as Example 1, except that the 12g of β-cyclodextrin and 2g of capsaicin in step (1) are replaced with 18.0g of β-cyclodextrin and 2g of capsaicin, and the rest are the same; Comparative Example 3: Comparative Example 3 is basically the same as Example 1, except that the amount of β-cyclodextrin-coated capsaicin in step (2) is changed from 14.2 parts to 7.0 parts, and the rest is the same; Comparative Example 4: Comparative Example 4 is basically the same as Example 1, except that the 14.2 parts of β-cyclodextrin-coated capsaicin in step (2) are changed to 24 parts, and the rest are the same; Comparative Example 5: Comparative Example 5 is basically the same as Example 1, except that the β-cyclodextrin-coated capsaicin in step (1) is replaced with capsaicin, and the rest is the same. Comparative Example 6: Comparative Example 6 is basically the same as Example 1, except that L-75 in step (1) is removed, otherwise it is the same. Comparative Example 7: Comparative Example 7 is basically the same as Comparative Example 5, except that L-75 in step (1) is removed, otherwise they are the same. Comparative Example 8: Comparative Example 8 is basically the same as Example 1, except that the thickness of the adhesive layer in step (3) is changed from 200-220 μm to 120-130 μm, and the rest is the same; Examples 1-13 and Comparative Examples 1-7 of this application present the following tape characteristic data: Table 1 shows the performance tests of the tapes in Examples 1-13: Table 2 shows the performance tests of the tapes in Comparative Examples 1-7: Remark: 1 represents a 180° peeling force and a glass speed of 300 m / min; 2 represents room temperature testing (25℃); 3 represents short-term thermal aging at 200℃. 6 hours, overload thermal aging at 175℃ 240h; NG means failure; pass means the requirements are met and the test is passed.

[0022] Test results show that all performance indicators of Examples 1-13 meet the standards after being subjected to 150℃. Even after 10 days of high-temperature aging, it still maintains excellent rodent-repellent performance. In Comparative Examples 1-2, the mass ratio of β-cyclodextrin to capsaicin deviated from the optimal range, and rodent bite damage occurred after aging at 105℃, mainly due to insufficient or excessive coating affecting stability. In Comparative Examples 3-4, the amount of β-cyclodextrin-coated capsaicin was too low to achieve an effective rodent-repellent effect, while too high an amount easily led to aggregation, affecting the performance of the adhesive layer. Comparative Example 5 did not undergo β-cyclodextrin coating, and rodent bite damage occurred after aging at 50℃, indicating extremely poor high-temperature stability. Comparative Examples 6-7 lacked chemical cross-linking, and their rodent-repellent performance failed after aging at temperatures above 105℃, proving that chemical anchoring is the key to high-temperature stability. Comparative Example 8 had insufficient adhesive layer thickness, and its rodent-repellent performance failed after aging at 150℃, indicating that insufficient thickness could not provide long-term protection.

[0023] In summary, the tape can only achieve 150°C when the porous cyclic group coating and isocyanate crosslinking are combined, and the proportions, amounts, and thickness of each component are controlled within the preferred range. Excellent long-lasting rodent-proof performance after 10 days of high-temperature aging.

[0024] 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 high-temperature resistant rodent-proof fabric-based adhesive tape, comprising a fabric substrate and an adhesive layer coated on the fabric substrate, characterized in that: The adhesive layer is prepared from raw materials comprising the following components: liquid host resin, thermal crosslinking agent and porous cyclic group-coated capsaicin; The capsaicin in the porous cyclic coating contains phenolic hydroxyl groups. During the curing process of the adhesive layer, the isocyanate groups in the thermal crosslinking agent undergo a chemical crosslinking reaction with the phenolic hydroxyl groups of the capsaicin molecules, anchoring the capsaicin in the adhesive network in the form of covalent bonds. The tape still has a repellent effect on rodents after aging at 150°C for 10 days and 14 days.

2. The high-temperature resistant rodent-proof fabric base cable tape according to claim 1, characterized in that: The raw materials of the adhesive layer include, by weight: 60-100 parts of hydroxyl resin, 0.2-1.2 parts of thermal crosslinking agent, and 5.0-30.0 parts of porous cyclic-coated capsaicin.

3. The high-temperature resistant rodent-proof fabric base cable tape according to claim 1, characterized in that: The mass ratio of porous cyclic groups to capsaicin in the porous cyclic group-coated capsaicin is (2.0~40.0):

1.

4. The high-temperature resistant rodent-proof fabric baseline tape according to claim 1, characterized in that: The liquid host resin is one of acrylic hydroxyl resin, polyester hydroxyl resin, and polyurethane hydroxyl resin.

5. The high-temperature resistant rodent-proof fabric base cable tape according to claim 1, characterized in that: The isocyanate curing agent is one of aromatic polyisocyanate or aliphatic polyisocyanate.

6. A method for preparing a high-temperature resistant rodent-proof fabric-based adhesive tape as described in any one of claims 1 to 5, characterized in that: Includes the following steps: (1) Preparation of capsaicin coating: Mix the porous cyclic group with capsaicin, add solvent, place in an oven at 50-60℃ and heat for 30-60 min until dissolved, and allow the capsaicin solution to enter the cavity of the porous cyclic group under grinding conditions. After vacuum drying, the porous cyclic group coated capsaicin powder is obtained. (2) Preparation of adhesive: Mix hydroxyl resin, thermal crosslinking agent and the porous cyclic group-coated capsaicin powder obtained in step (1), stir evenly, let stand to defoam, and obtain adhesive; (3) Coating: The adhesive obtained in step (2) is coated on the surface of the cloth substrate and dried and cured to obtain the high temperature resistant rodent-proof cloth base bundle tape.

7. The preparation method according to claim 6, characterized in that, The porous cyclic group in step (1) is selected from one of hydroxypropyl gamma cyclodextrin, sodium sulfobutyl beta-cyclodextrin, hydroxypropyl beta-cyclodextrin, methyl beta-cyclodextrin, alpha cyclodextrin, beta-cyclodextrin, and gamma cyclodextrin; the solvent is selected from ethyl acetate or anhydrous ethanol.

8. The preparation method according to claim 6, characterized in that, The weight ratio of the hydroxyl resin, isocyanate curing agent and porous cyclic-coated capsaicin powder in step (2) is 100:(0.4-0.6):(6.0-30.0).

9. The preparation method according to claim 6, characterized in that, The hydroxyl resin solid content in step (2) is 30-80%.

10. The application of the high-temperature resistant rodent-proof fabric wire harness tape prepared by any one of claims 6 to 9 in rodent protection of automotive engine compartment wiring harnesses, power cables or communication optical cables.

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