A bio-based plasticizer and shell powder modified antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses

Abstract

The invention discloses an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based plasticizer and shell powder. The tape comprises 100 parts of PVC resin powder, 50-70 parts of a bio-based polyester plasticizer, 2-3.5 parts of a stabilizer, 2.5-5 parts of a bio-based auxiliary stabilizer, 5 parts of a bio-based liquid rubber tackifier, 1.5-3.5 parts of a bio-based resin tackifier, 5-10 parts of an antibacterial modifier, 0.5-1 part of a PVC antibacterial and antiviral agent, 10-25 parts of a filler, and 2-4 parts of other additives. The bio-based plasticizer is composed of at least one of poly(tetraethylene glycol adipate), dioctyl succinate, and castor oil-based diethyl phosphate; the bio-based auxiliary stabilizer is epoxidized soybean oil, and the bio-based liquid rubber tackifier is liquid polybutadiene; the bio-based tackifying resin is zinc resinate; the product of the present invention has good mechanical properties, high temperature resistance, and durability, and can achieve glue-free self-adhesion; no solvents are used and no volatile organic compounds are released during the production and use process, the product has antibacterial and antiviral functions, and complies with environmental protection regulations.

Description

Technical Field

[0001] The present invention relates to the technical field of PVC electrical adhesive tapes, in particular to an antibacterial and antiviral PVC self-adhesive tape for automobile wiring harnesses modified with a bio-based plasticizer and shell powder, and a preparation process thereof. Background Art

[0002] The base material of traditional PVC tape is made of petroleum-based phthalate derivatives such as DOP as plasticizer, and then coated with solvent-based pressure-sensitive adhesive.

[0003] Phthalate derivative plasticizers such as DOP are low molecular weight plasticizers that are volatile and have poor high-temperature stability. They are also easy to migrate to the surface of materials or be extracted by solvents such as oil and soapy water. They have poor durability and may interfere with the endocrine system. Contact with the human body can cause physiological toxicity problems.

[0004] Organic solvents such as toluene also pose environmental pollution and safety issues.

[0005] DOP, DINP, and toluene solvents are petroleum products that are non-renewable and face the problem of dwindling petroleum resources.

[0006] In addition, traditional PVC tapes are prone to absorbing dust and producing mold after long-term use. Summary of the Invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based plasticizer and shell powder to solve the problems raised in the above technical background.

[0008] To achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A formula and production process for an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based polyester plasticizer and shell powder. The formula and process can replace some traditional formulas and processes to produce PVC electrical tape.

[0010] In the first aspect, the present invention provides a formula for an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based polyester plasticizer and shell powder, the main raw materials of which are PVC resin powder, bio-based plasticizer, stabilizer, bio-based auxiliary stabilizer, bio-based liquid rubber tackifier, bio-based resin tackifier, antibacterial modifier, PVC antibacterial and antiviral agent, filler and other additives.

[0011] Preferably, the specific formula of an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based polyester plasticizer and shell powder mainly consists of: 100 parts of PVC resin powder, 50-70 parts of bio-based polyester plasticizer, 2-3.5 parts of stabilizer, 2.5-5 parts of bio-based auxiliary stabilizer, 5 parts of bio-based liquid rubber tackifier, 1.5-3.5 parts of bio-based resin tackifier, 5-10 parts of antibacterial modifier, 0.5-1 part of PVC antibacterial and antiviral agent, 10-25 parts of filler and 2-4 parts of other additives.

[0012] Preferably, the polymerization degree of the PVC resin powder is 1000-1300; the manufacturer is Tianjin Dagu Chemical Co., Ltd.

[0013] Preferably, the bio-based plasticizer is composed of at least one of poly(tetraethylene adipate), dioctyl succinate, and castor oil diethyl phosphate (PPC); both dioctyl succinate and castor oil diethyl phosphate (PPC) are supplied by DuPont (USA). Poly(tetraethylene adipate) is synthesized from adipic acid and tetraethylene glycol monomers through esterification and polycondensation. A specific preparation method is described in Zhou Feng, "Synthesis and Application of Poly(tetraethylene adipate) Plasticizer" (Master's Thesis, Wuhan Textile University), Engineering Technology, Vol. 1, No. 9, 2013.

[0014] Preferably, the stabilizer is one of an environmentally friendly liquid composite calcium-zinc stabilizer (Ca-Zn stabilizer) and an environmentally friendly liquid composite barium-zinc stabilizer (Ba-Zn stabilizer); the stabilizer manufacturer is Shandong Yueyang New Materials Energy Technology.

[0015] Preferably, the bio-based auxiliary stabilizer is epoxidized soybean oil, model: high-purity ESO, industrial grade, produced by Guangzhou Yuanda New Materials Co., Ltd.

[0016] Preferably, the bio-based liquid rubber tackifier is liquid polybutadiene, model: Polyvest 130; imported from the United States.

[0017] Preferably, the bio-based tackifying resin is zinc resinate, model RESIN, imported from the United States.

[0018] Preferably, the antibacterial modifier is shell powder with a specification of 1250 mesh, and the supplier is Tianjin Hongyan.

[0019] Preferably, the PVC antibacterial and antiviral agent is a cationic polymer system, model number SR-AVP-803; the supplier is SR Trading Co., Ltd. of Japan.

[0020] Preferably, the filler is light calcium carbonate with a specification of 1250 mesh, and the supplier is Yulang New Materials Co., Ltd.

[0021] Preferably, the other auxiliary agent is color flakes, and the supplier is Shandong Jincaiyang New Materials Technology.

[0022] Preferably, the ratio of the bio-based liquid rubber tackifier to the bio-based tackifying resin is 5:(1.5-3.5); further preferably, the ratio of the bio-based liquid rubber tackifier to the bio-based tackifying resin is 2:1.

[0023] The present invention uses renewable bio-based polyester plasticizers such as poly(tetraethylene glycol adipate), dioctyl succinate, and castor oil diethyl phosphate (PPC) to replace traditional petroleum-based phthalate derivatives such as DOP. These bio-based polyester plasticizers have good compatibility with polymer materials such as PVC and are not easily migrated to the material surface or extracted by solvents such as oil and soapy water, thereby extending the service life of the product. Bio-based polyester plasticizers have a large molecular weight and low volatility, stable performance at high temperatures, excellent cold resistance, and can still maintain the material's flexibility in low-temperature environments. Combined with the bio-based auxiliary stabilizer epoxidized soybean oil, they can further enhance the product's high-temperature resistance and durability. This solves the problem of the petroleum-based phthalate plasticizer DOP being easily migrated and causing physiological toxicity upon contact with the human body, thereby meeting environmental protection standards.

[0024] The present invention improves the polarity and wettability of the polymer film and enhances its self-adhesion by adding bio-based liquid rubber such as liquid polybutadiene, bio-based zinc resinate and other additives for blending and modification. It does not require the application of adhesives and can achieve glue-free self-adhesion, thus reducing the coating process, improving process efficiency, shortening the production cycle, and saving space, labor, equipment and energy consumption.

[0025] The product of the present invention does not use petroleum solvents such as toluene, thus reducing the consumption of petroleum resources and realizing the development of solvent-free technology. It does not release volatile organic compounds (VOCs) during production and use, thus avoiding the risks of fire and explosion, air pollution and photochemical reactions, and complies with global environmental regulations (such as EU RoHS and China GB 18581 standards).

[0026] In addition, the present invention modifies the PVC by adding shell powder and PVC antibacterial and antiviral agents. The modified product can adsorb and decompose harmful substances in the air, achieving multiple functions such as air purification, antibacterial and antiviral. It overcomes the disadvantages of traditional products that are easy to absorb dust and mold. The product has antibacterial and antiviral functions and solves the problem of tape becoming old, moldy and black.

[0027] In a second aspect, the present invention also provides a process for preparing an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based polyester plasticizer and shell powder, comprising the following steps:

[0028] Step 1: Pretreatment and mixing of raw materials: Pre-treat and mix the raw materials according to the above-mentioned PVC self-adhesive tape formula. The PVC resin powder needs to be sieved through a 30-mesh sieve to remove impurities, and the liquid additives (such as plasticizers) need to be filtered.

[0029] Step 2, high-speed mixing: Add PVC resin powder, bio-based polyester plasticizer, Ba-Zn stabilizer, bio-based auxiliary stabilizer, liquid polybutadiene, zinc resinate, shell powder, PVC antibacterial and antiviral agent, light calcium carbonate and other raw materials into a high-speed mixer. The mixing time is 200 seconds to 240 seconds, and the temperature is controlled at 80℃ to 120℃. Allow the resin powder to fully absorb the plasticizer and mix evenly with the added additives to form a dry mix with high apparent density, good fluidity and dry looseness.

[0030] Step 3, plasticizing and extruding: discharge the mixed material into a planetary twin-screw extruder, add color flakes, control the temperature at 140℃-150℃, and mix and plasticize evenly;

[0031] Step 4, rolling mill: discharge the material to the rolling mill, add mixing, and control the temperature of the rolling mill at 140℃-160℃;

[0032] Step 5, calendering: feeding the material to the tape machine, calendering into a film, then embossing, cooling, and winding into a semi-finished PVC film. The temperature of the calender is controlled at 160℃-175℃; the thickness of the PVC film is controlled at 0.10mm±0.005mm.

[0033] Step 6: Rewind the PVC film into small shafts of specified length and cut them into products of required specifications.

[0034] Step 7: Inspection, packaging and storage.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The renewable bio-based plasticizer used in the product of the present invention has good compatibility with polymer materials such as PVC and has a good plasticizing effect.

[0037] 2. The renewable bio-based polyester plasticizer used in the product of the present invention has a large molecular weight and low volatility. It is not easily migrated to the surface of the material or extracted by solvents such as oil and soapy water, which can extend the service life of the product. The combination of multiple bio-based polyester plasticizers and the bio-based auxiliary stabilizer epoxy soybean oil can further increase the thermal degradation temperature (Td) and migration resistance of PVC, reduce plasticizer precipitation, and improve the heat resistance, mechanical properties and stability of the plastic.

[0038] 3. The renewable bio-based plasticizer used in the product of the present invention has good biodegradability and is harmless to the environment and human body; it solves the problems of easy migration, volatility, poor heat resistance and durability, and physiological toxicity of DOP and DINP plasticizers, and meets environmental protection standards.

[0039] 4. The product of the present invention is modified with bio-based liquid rubber and bio-based zinc resin acid to improve the polarity and wettability of the polymer film, and can achieve glue-free self-adhesion without the need to apply adhesives, effectively reducing the consumption of petroleum resources and meeting national environmental protection and carbon reduction requirements; it solves the high VOC content of traditional PVC wiring harness tapes and the safety and environmental protection issues.

[0040] 5. The product of the present invention uses shell powder and PVC special antiviral agent for blending and modification. The modified product can adsorb and decompose harmful substances in the air, achieve multiple functions such as air purification, antibacterial and antiviral, and overcome the disadvantages of traditional products that are easy to absorb dust and mold.

[0041] 6. The products of this project comply with EU RoHS and REACH regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a product picture of the PVC self-adhesive tape obtained in Example 1 of the present invention;

[0043] Figure 2 This is a product picture of the PVC self-adhesive tape obtained in Example 2 of the present invention;

[0044] Figure 3 This is a product picture of the PVC self-adhesive tape obtained in Example 3 of the present invention;

[0045] Figure 4 This is a product picture of the PVC self-adhesive tape obtained in Example 4 of the present invention. DETAILED DESCRIPTION

[0046] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0047] The present invention provides a formula and process for producing a bio-based polyester plasticizer and shell powder-modified antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses. The main raw materials of the product of the present invention include PVC resin powder, a bio-based plasticizer, a stabilizer, a bio-based auxiliary stabilizer, a bio-based liquid rubber tackifier, a bio-based resin tackifier, an antibacterial modifier, a PVC antibacterial and antiviral agent, a filler, and other additives. The bio-based polyester plasticizer is composed of one to three of poly(tetraethylene glycol adipate), dioctyl succinate, and castor oil-based diethyl phosphate (PPC); the stabilizer is one of an environmentally friendly liquid composite calcium-zinc stabilizer and an environmentally friendly liquid composite barium-zinc stabilizer; the bio-based auxiliary stabilizer is epoxidized soybean oil; the bio-based liquid rubber tackifier is liquid polybutadiene; the bio-based tackifying resin is zinc resinate; the antibacterial modifier is shell powder; the PVC antiviral agent is a cationic polymer system; the filler is light calcium carbonate; and the other additives are color flakes. The specific formula mainly consists of: 100 parts of PVC resin powder, 50-70 parts of bio-based polyester plasticizer, 2-3.5 parts of stabilizer, 2.5-5 parts of bio-based auxiliary stabilizer, 5 parts of bio-based liquid rubber tackifier, 1.5-3.5 parts of bio-based resin tackifier, 5-10 parts of antibacterial modifier, 0.5-1 part of PVC antibacterial and antiviral agent, 10-25 parts of filler and 2-4 parts of other additives.

[0048] Preferably, the bio-based polyester plasticizer has good compatibility with polymer materials such as PVC and high plasticizing efficiency; it has a large molecular weight and low volatility, is not easily migrated to the surface of the material or extracted by solvents such as oil and soapy water, and can extend the service life of the product; further preferably, one to three of poly (tetraethylene glycol adipate), dioctyl succinate, and castor oil diethyl phosphate (PPC) are used in combination to increase the thermal degradation temperature (Td) and migration resistance of PVC, reduce plasticizer precipitation, improve the heat resistance of the plastic, and enhance low-temperature flexibility; further preferably, it is synergistic with the bio-based auxiliary stabilizer epoxidized soybean oil to further improve the product's high temperature resistance and durability.

[0049] Further preferably, the present invention improves the polarity and wettability of the polymer film and improves the self-adhesion by adding bio-based liquid rubber such as liquid polybutadiene, bio-based resin acid zinc and other additives for blending and modification, so as to achieve glue-free self-adhesion without applying adhesive, thereby reducing the coating process, improving process efficiency, shortening the production cycle, and saving space, labor, equipment and energy consumption; the product of the present invention does not use petroleum solvents such as toluene, reducing the consumption of petroleum resources, realizing the development of solvent-free technology, and does not release volatile organic compounds (VOCs) during production and use, avoiding the risk of fire and explosion, air pollution and photochemical reactions, and complying with global environmental regulations (such as EU RoHS and China GB 18581 standards).

[0050] Further preferably, the present invention is modified by adding shell powder and PVC antibacterial and antiviral agents. The modified product can adsorb and decompose harmful substances in the air, thereby achieving multiple functions such as air purification, antibacterial and antiviral. It overcomes the disadvantages of traditional products that are easy to adsorb dust and mold. The product has antibacterial and antiviral functions, and solves the problem of tape becoming moldy and black due to aging.

[0051] The present invention also provides a process for producing an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based polyester plasticizer and shell powder, comprising the following steps:

[0052] Step 1: Pretreatment and mixing of raw materials: Pre-treat and mix the raw materials according to the above-mentioned PVC self-adhesive tape formula. The PVC resin needs to be sieved through a 30-mesh sieve to remove impurities, and the liquid additives (such as plasticizers) need to be filtered.

[0053] Step 2, high-speed mixing: Add PVC resin powder, bio-based polyester plasticizer, Ba-Zn stabilizer, bio-based auxiliary stabilizer, liquid polybutadiene, zinc resinate, shell powder, PVC antibacterial and antiviral agent, light calcium carbonate and other raw materials into a high-speed mixer. The mixing time is 200 seconds to 240 seconds, and the temperature is controlled at 80℃ to 120℃. Allow the resin powder to fully absorb the plasticizer and mix evenly with the added additives to form a dry mix with high apparent density, good fluidity and dry looseness.

[0054] Step 3: Plasticizing and extruding: Discharge the mixed material into a planetary twin-screw extruder, add color flakes, control the temperature at 140-150°C, and mix and plasticize evenly.

[0055] Step 4, rolling mill: discharge the material to the rolling mill, add mixing, and control the temperature of the rolling mill at 140℃-160℃;

[0056] Step 5, calendering: feeding the material to the tape machine, calendering into a film, then embossing, cooling, and winding into a semi-finished PVC film. The temperature of the calender is controlled at 160℃-175℃; the thickness of the PVC film is controlled at 0.10mm±0.005mm.

[0057] Step 6: Rewind the PVC film into small shafts of specified length and cut them into products of required specifications.

[0058] Step 7: Inspection, packaging and storage.

[0059] The technical solution of the present invention will be further described below with reference to embodiments and comparative examples.

[0060] Example 1:

[0061] 1. Recipe

[0062] 100 parts of PVC resin powder, 70 parts of poly (tetraethylene glycol adipate), 2.5 parts of Ba-Zn stabilizer, 5 parts of liquid polybutadiene, 2.5 parts of zinc resinate, 8 parts of shell powder, 0.8 parts of PVC antibacterial and antiviral agent, 20 parts of light calcium carbonate, 3.5 parts of epoxidized soybean oil, and 2.5 parts of color chips.

[0063] 2. Production process

[0064] 1. Raw material pretreatment: PVC resin needs to be sieved through a 30-mesh sieve to remove impurities, and liquid additives (such as plasticizers) need to be filtered.

[0065] 2. High-speed mixing: Add PVC resin powder, bioplasticizer (poly(tetraethylene glycol adipate)), Ba-Zn stabilizer, bio-based auxiliary stabilizer (epoxidized soybean oil), liquid polybutadiene, zinc resinate, shell powder, PVC antibacterial and antiviral agent, light calcium carbonate and other raw materials into a high-speed mixer. The mixing time is 220 seconds ± 20 seconds and the temperature is controlled at 100℃ ± 20℃. Allow the resin powder to fully absorb the plasticizer and mix evenly with the added additives to form a dry mix with high apparent density, good fluidity and dry looseness.

[0066] 3. Plasticizing and extrusion: Discharge the mixed material into a planetary twin-screw extruder, then add the color flakes, control the temperature at 145℃±5℃, and mix and plasticize evenly.

[0067] 4. Turbine mill: discharge the material to the turbine mill and add mixing. The temperature of the turbine mill should be controlled at 150℃±10℃.

[0068] 5. Calendering: Feed the material to the tape machine, calender into film, then emboss, cool, and wind up into semi-finished PVC film. The calender temperature is controlled at 160℃±15℃; the thickness of the PVC film is controlled at 0.10mm±0.005mm

[0069] 6. Rewind the PVC film into small shafts of specified length and cut into products of required specifications.

[0070] 7. Inspection, packaging and storage. Figure 1 shown.

[0071] Example 2:

[0072] 1. Recipe

[0073] 100 parts of PVC resin powder, 60 parts of poly (tetraethylene glycol adipate), 10 parts of castor oil diethyl phosphate, 2.5 parts of Ba-Zn stabilizer, 5 parts of liquid polybutadiene, 2.5 parts of zinc resinate, 8 parts of shell powder, 0.8 parts of PVC antibacterial and antiviral agent, 20 parts of light calcium carbonate, 3.5 parts of epoxidized soybean oil, and 2.5 parts of color flakes.

[0074] 2. Production process

[0075] 1. Raw material pretreatment: PVC resin needs to be sieved through a 30-mesh sieve to remove impurities, and liquid additives (such as plasticizers) need to be filtered.

[0076] 2. High-speed mixing: Add PVC resin powder, bioplasticizer (poly (tetraethylene glycol adipate), castor oil-based diethyl phosphate), Ba-Zn stabilizer, bio-based auxiliary stabilizer (epoxidized soybean oil), liquid polybutadiene, zinc resinate, shell powder, PVC antibacterial and antiviral agent, light calcium carbonate and other raw materials into a high-speed mixer with a mixing time of 220 seconds ± 20 seconds and a temperature of 100°C ± 20°C. Allow the resin powder to fully absorb the plasticizer and mix evenly with the added additives to form a dry mix with high apparent density, good fluidity and dry looseness.

[0077] 3. Plasticizing and extrusion: discharge the mixed material into the planetary twin-screw extruder, then add the color flakes, control the temperature at 145℃±5℃, and mix and plasticize evenly.

[0078] 4. Turbine mill: discharge the material to the turbine mill and add mixing. The temperature of the turbine mill should be controlled at 150℃±10℃.

[0079] 5. Calendering: Feed the material to the tape machine, calender into film, then emboss, cool, and wind up into semi-finished PVC film. The temperature of the calender is controlled at 160℃±10℃; the thickness of the PVC film is controlled at 0.10mm±0.005mm.

[0080] 6. Rewind the PVC film into small shafts of specified length and cut them into products of required specifications.

[0081] 7. Inspection, packaging and storage. Figure 2 shown.

[0082] Example 3:

[0083] 1. Formula: 100 parts of PVC resin powder, 60 parts of poly (tetraethylene glycol adipate), 10 parts of dioctyl succinate, 2.5 parts of Ba-Zn stabilizer, 5 parts of liquid polybutadiene, 2.5 parts of zinc resinate, 8 parts of shell powder, 0.8 parts of PVC antibacterial and antiviral agent, 20 parts of light calcium carbonate, 3.5 parts of epoxidized soybean oil, and 2.5 parts of color chips.

[0084] 2. Production process

[0085] 1. Raw material pretreatment: PVC resin needs to be sieved through a 30-mesh sieve to remove impurities, and liquid additives (such as plasticizers) need to be filtered.

[0086] 2. High-speed mixing: Add PVC resin powder, bioplasticizer (poly(tetraethylene glycol adipate), dioctyl succinate), Ba-Zn stabilizer, bio-based auxiliary stabilizer (epoxidized soybean oil), liquid polybutadiene, zinc resinate, shell powder, PVC antibacterial and antiviral agent, light calcium carbonate and other raw materials into a high-speed mixer with a mixing time of 220 seconds ± 20 seconds and a temperature of 100°C ± 20°C. Allow the resin powder to fully absorb the plasticizer and mix evenly with the added additives to form a dry mix with high apparent density, good fluidity and dry looseness.

[0087] 3. Plasticizing and extrusion: Discharge the mixed material into a planetary twin-screw extruder, then add the color flakes, control the temperature at 145℃±5℃, and mix and plasticize evenly.

[0088] 4. Turbine mill: discharge the material to the turbine mill and add mixing. The temperature of the turbine mill should be controlled at 150℃±10℃.

[0089] 5. Calendering: Feed the material to the tape machine, calender into film, then emboss, cool, and wind up into semi-finished PVC film. The calender temperature is controlled at 160℃±10℃; the PVC film thickness is controlled at 0.10mm±0.005mm.

[0090] 6. Rewind the PVC film into small shafts of specified length and cut into products of required specifications.

[0091] 7. Inspection, packaging and storage. Figure 3 shown.

[0092] Example 4:

[0093] 1. Recipe

[0094] 100 parts of PVC resin powder, 60 parts of poly (tetraethylene glycol adipate), 5 parts of castor oil diethyl phosphate, 5 parts of dioctyl succinate, 2.5 parts of Ba-Zn stabilizer, 5 parts of liquid polybutadiene, 2.5 parts of zinc resinate, 8 parts of shell powder, 0.8 parts of PVC antibacterial and antiviral agent, 20 parts of light calcium carbonate, 3.5 parts of epoxidized soybean oil, and 2.5 parts of color flakes.

[0095] 2. Production process

[0096] 1. Raw material pretreatment: PVC resin needs to be sieved through a 30-mesh sieve to remove impurities, and liquid additives (such as plasticizers) need to be filtered.

[0097] 2. High-speed mixing: Add PVC resin powder, bioplasticizer (poly (tetraethylene glycol adipate), castor oil diethyl phosphate, dioctyl succinate), Ba-Zn stabilizer, bio-based auxiliary stabilizer (epoxidized soybean oil), liquid polybutadiene, zinc resinate, shell powder, PVC antibacterial and antiviral agent, light calcium carbonate and other raw materials into a high-speed mixer. The mixing time is 220 seconds ± 20 seconds and the temperature is controlled at 100℃ ± 20℃. Allow the resin powder to fully absorb the plasticizer and mix evenly with the added additives to form a dry mix with high apparent density, good fluidity and dry looseness.

[0098] 3. Plasticizing and extrusion: discharge the mixed material into the planetary twin-screw extruder, then add the color flakes, control the temperature at 145℃±5℃, and mix and plasticize evenly.

[0099] 4. Turbine mill: discharge the material to the turbine mill and add mixing. The temperature of the turbine mill should be controlled at 150℃±10℃.

[0100] 5. Calendering: Feed the material to the tape machine, calender into film, then emboss, cool, and wind up into semi-finished PVC film. The temperature of the calender is controlled at 160℃±10℃; the thickness of the PVC film is controlled at 0.10mm±0.005mm.

[0101] 6. Rewind the PVC film into small shafts of specified length and cut them into products of required specifications.

[0102] 7. Inspection, packaging and storage. Figure 4 shown.

[0103] The ingredients of the adhesives obtained in Examples 1-4 are shown in Table 1, and the ingredients of the adhesives obtained in Comparative Examples 1-3 are shown in Table 2

[0104] Table 1 Ingredients

[0105] Raw material name Example 1 Example 2 Example 3 Example 4 PVC resin powder 100 100 100 100 Poly(tetraethylene glycol adipate) 70 60 60 60 Castor oil diethyl phosphate － 10 － 5 Dioctyl succinate － － 10 5 Ba-Zn stabilizer 2.5 2.5 2.5 2.5 Epoxidized soybean oil 3.5 3.5 3.5 3.5 Liquid polybutadiene 5 5 5 5 Zinc resinate 2.5 2.5 2.5 2.5 Shell powder 8 8 8 8 PVC antibacterial and antiviral agent 0.8 0.8 0.8 0.8 Light calcium carbonate 20 20 20 20 Color chips 2.5 2.5 2.5 2.5

[0106] Based on Example 4, the ingredient list is set with different plasticizers, or no epoxy soybean oil is added. Except for the different ingredients, the other ingredients are the same as Example 4. The specific ingredient list is shown in Table 2.

[0107] Table 2 Ingredients

[0108] Raw material name Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 PVC resin powder 100 100 100 100 Poly(tetraethylene glycol adipate) 60 - 60 - Castor oil diethyl phosphate 5 35 5 - Dioctyl succinate 5 35 5 - Dioctyl phthalate (DOP) - - - 70 Ba-Zn stabilizer 2.5 2.5 2.5 2.5 Epoxidized soybean oil 3.5 3.5 - 3.5 Liquid polybutadiene 5 5 5 5 Zinc resinate 2.5 2.5 2.5 2.5 Shell powder 8 8 8 8 PVC antibacterial and antiviral agent 0.8 0.8 0.8 0.8 Light calcium carbonate 20 20 20 20 Color chips 2.5 2.5 2.5 2.5

[0109] Based on Example 4, the ingredient list sets different ratios of liquid polybutadiene and zinc resinate. Except for the different ratios, the rest are the same as Example 4. The specific ingredient list is shown in Table 3.

[0110] Table 3 Ingredients

[0111] Raw material name Example 4 Example 5 Example 6 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 PVC resin powder 100 100 100 100 100 100 100 Poly(tetraethylene glycol adipate) 60 60 60 60 60 60 60 Castor oil diethyl phosphate 5 5 5 5 5 5 5 Dioctyl succinate 5 5 5 5 5 5 5 Ba-Zn stabilizer 2.5 2.5 2.5 2.5 2.5 2.5 2.5 Epoxidized soybean oil 3.5 3.5 3.5 3.5 3.5 3.5 3.5 Liquid polybutadiene 5 5 5 5 5 - 5 Zinc resinate 2.5 1.5 3.5 1 4 2.5 - Shell powder 8 8 8 8 8 8 8 PVC antibacterial and antiviral agent 0.8 0.8 0.8 0.8 0.8 0.8 0.8 Light calcium carbonate 20 20 20 20 20 20 20 Color chips 2.5 2.5 2.5 2.5 2.5 2.5 2.5

[0112] The adhesive tapes produced by the adhesives prepared in Examples 1 to 6 and Comparative Examples 1 to 7 were tested, and the specific data are shown in Tables 4 and 5.

[0113] Tensile strength and elongation at break inspection method: according to GB / T20631.2-2006.

[0114] Test method for substrate peel strength (self-adhesion): according to GB / T20631.2-2006.

[0115] Aging performance (high temperature resistance, durability) test method: according to T / CPCIF 0061-2020 Appendix A 2.4.

[0116] Table 4 Physical properties test of adhesive tape 1

[0117] Inspection items Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tape thickness (mm) 0.103 0.106 0.104 0.106 0.106 0.104 0.104 Tensile strength (N / cm) 30.8 31.1 31.5 34.2 30.4 29 26 Elongation at break (%) 248 253 251 260 234 202 178 Self-adhesion: peel strength to substrate (N / cm) 2.51 2.57 2.59 2.67 2.47 2.39 2.43 Durability: Aging characteristics (130℃×240h) pass pass pass pass pass pass Failed embrittlement Tensile strength after aging (130℃×240h, N / cm) 25.9 26.3 26.7 27.9 21.2 18.8 embrittlement Elongation at break after aging (130℃×240h, %) 186 193 197 208 140 138 embrittlement

[0118] Table 5 Physical properties test of tape 2

[0119] Inspection items Example 4 Example 5 Example 6 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Tape thickness (mm) 0.106 0.106 0.104 0.102 0.103 0.104 0.106 Tensile strength (N / cm) 34.2 30.4 29 33.2 27 35 34.5 Elongation at break (%) 260 234 202 257 170 178 272 Self-adhesion: peel strength to substrate (N / cm) 2.67 2.47 2.39 1.42 1.02 0.91 1.03 Durability: Aging characteristics (130℃×240h) pass pass pass pass Failed pass pass

[0120] Tables 4 and 5 show that the tapes obtained in Examples 1-4 exhibit excellent performance. Compared to Example 1, Example 4 exhibits over 7% higher tensile strength and elongation than the PVC tape in Example 1. Furthermore, the combination of three plasticizers, castor oil-based diethyl phosphate and dioctyl succinate, creates a synergistic effect, resulting in improved plasticization of the PVC film. After aging (130°C for 240 hours), the strength remains above 80%. This demonstrates that poly(tetraethylene glycol adipate) as a plasticizer exhibits superior physical properties such as tensile strength, elongation, and durability, and that combining multiple plasticizers offers superior performance.

[0121] Table 4 shows that compared to Comparative Examples 1-2, the tensile strength and elongation of the tape produced in Example 4 are 18% and 28.7% higher than those in Comparative Example 2, respectively. The tape obtained in Example 4 also meets the requirements for aging (130°C x 240h), and its strength remains above 80% after aging (130°C x 240h). This demonstrates that poly(tetraethylene glycol adipate) and epoxidized soybean oil synergistically improve the high-temperature resistance and durability of the PVC self-adhesive tape. Comparing Example 3 with Example 4, the tensile strength and elongation of the PVC tape produced in Example 4 are also increased by 31.5% and 46%, respectively. Comparative Example 3 does not meet the durability requirements, and after aging (130°C x 240h), the material becomes brittle. This demonstrates that poly(tetraethylene glycol adipate) as a plasticizer significantly outperforms the conventional plasticizer DOP in durability.

[0122] As can be seen from Table 5, the self-adhesive properties of the tapes obtained in Examples 4-6 are good, proving that the ratio of polybutadiene to zinc resinate is in the range of 5:(1.5-3.5), preferably 5:2.5, which results in better self-adhesive properties. Comparing Example 4 with Comparative Examples 4-5, it can be seen that the peel strength of the tape obtained in Example 4 to the substrate is significantly better than that of Comparative Examples 4-5, indicating that the self-adhesive properties of the tape are poor when the ratio of polybutadiene to zinc resinate is outside the range of 5:(1.5-3.5). This is because if the amount of zinc resinate is too little, the wettability is poor, resulting in poor self-adhesive properties. If the amount of zinc resinate is too much, the glass transition temperature of the self-adhesive tape increases, the tape becomes brittle, and the self-adhesive properties also deteriorate.

[0123] Comparing Example 4 with Comparative Examples 6-7, it can be seen that the peel strength of the tape obtained in Example 4 to the substrate is significantly better than that of Comparative Examples 6-7, indicating that there is no self-adhesion when one of polybutadiene and zinc resinate is removed. This proves that the blending and modification of liquid polybutadiene, bio-based zinc resinate and other additives improves the polarity and wettability of the polymer film, enhances the self-adhesion, and does not require the application of adhesive, thereby achieving glue-free self-adhesion.

[0124] The present invention rationally selects a variety of bio-based plasticizers, adjusts their ratio with the bio-based liquid tackifier and the bio-based resin, and gives full play to the synergistic effect of the various components, thereby achieving a better balance between the physical properties and self-adhesion (peel strength to the backing) of the PVC self-adhesive tape, meeting the product performance requirements. At the same time, the present invention uses bio-based renewable raw materials, is processed and formed in one step, and does not use petroleum plasticizers and solvents, thus meeting low-carbon and environmental protection requirements.

[0125] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A bio-based polyester plasticizer and shell powder modified antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses, characterized in that: The composition comprises the following components by weight: 100 parts of PVC resin powder, 50-70 parts of bio-based polyester plasticizer, 2-3.5 parts of stabilizer, 2.5-5 parts of bio-based auxiliary stabilizer, 5 parts of bio-based liquid rubber tackifier, 1.5-3.5 parts of bio-based resin tackifier, 5-10 parts of antibacterial modifier, 0.5-1 part of PVC antibacterial and antiviral agent, 10-25 parts of filler and 2-4 parts of other additives; The bio-based polyester plasticizer contains poly(tetraethylene glycol adipate), the bio-based auxiliary stabilizer is epoxidized soybean oil, the bio-based liquid rubber tackifier is liquid polybutadiene, the bio-based resin tackifier is zinc resinate, and the antibacterial modifier is shell powder.

2. The antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based polyester plasticizer and shell powder according to claim 1, characterized in that: It contains the following components by weight: 100 parts of PVC resin powder, 70 parts of bio-based polyester plasticizer, 2.5 parts of stabilizer, 3.5 parts of bio-based auxiliary stabilizer, 5 parts of bio-based liquid rubber tackifier, 1.5-3.5 parts of bio-based resin tackifier, 8 parts of antibacterial modifier, 0.8 part of PVC antibacterial and antiviral agent, 20 parts of filler and 2.5 parts of other additives.

3. The antibacterial and antiviral PVC self-adhesive tape for automotive wiring harness modified with a bio-based polyester plasticizer and shell powder according to claim 1, characterized in that: The bio-based polyester plasticizer further comprises at least one of dioctyl succinate and castor oil-based diethyl phosphate.

4. The antibacterial and antiviral PVC self-adhesive tape for automotive wiring harness modified with a bio-based polyester plasticizer and shell powder according to claim 1, characterized in that: The stabilizer is one of an environmentally friendly liquid composite calcium-zinc stabilizer and an environmentally friendly liquid composite barium-zinc stabilizer.

5. The antibacterial and antiviral PVC self-adhesive tape for automotive wiring harness modified with a bio-based polyester plasticizer and shell powder according to claim 1, characterized in that: The PVC antibacterial and antiviral agent is a cationic polymer system with a model number of SR-AVP-803; the filler is light calcium carbonate.

6. A process for preparing an antibacterial and antiviral PVC self-adhesive tape for automotive wiring harnesses modified with a bio-based polyester plasticizer and shell powder according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, raw material pretreatment and batching: pretreat and batch the PVC self-adhesive tape raw material according to any one of claims 1 to 5, wherein the PVC resin powder needs to be sieved through a 30-mesh sieve to remove impurities, and the bio-based polyester plasticizer needs to be filtered; Step 2, high-speed mixing: add PVC resin powder, bio-based polyester plasticizer, stabilizer, bio-based auxiliary stabilizer, bio-based liquid rubber tackifier, bio-based resin tackifier, antibacterial modifier, PVC antibacterial and antiviral agent, and filler into a high-speed mixer. The mixing time is 200 seconds to 240 seconds. The temperature is controlled at 80°C to 120°C. Allow the resin powder to fully absorb the plasticizer and mix evenly with the added additives to form a dry mix with high apparent density, good fluidity, and dry looseness. Step 3, plasticizing and extruding: discharge the mixed material into a planetary twin-screw extruder, add other additives and color flakes, control the temperature at 140℃-150℃, and mix and plasticize evenly; Step 4, rolling mill: discharge the material to the rolling mill, add mixing, and control the temperature of the rolling mill at 140℃-160℃; Step 5, calendering: feeding the material to the tape machine, calendering into a film, then embossing, cooling, and winding into a semi-finished PVC film. The calendering machine temperature is controlled at 160℃-175℃; the PVC film thickness is controlled at 0.10mm±0.005mm; Step 6: Rewind the PVC film into a small shaft of a specified length and cut it into products of the required specifications; Step 7: Inspection, packaging and storage.

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