A method for producing a bopp waste tape

Abstract

The application relates to a preparation method of BOPP waste discharge adhesive tape and belongs to the technical field of adhesive tape. BOPP raw materials, an anti-blocking agent and color master batch are uniformly stirred and mixed, then are sent into an extruder for extrusion and chilling forming; the formed adhesive tape is longitudinally stretched, transversely stretched, pulled, subjected to surface corona treatment, wound, subjected to aging treatment, cut and packaged to obtain the BOPP waste discharge adhesive tape; the anti-blocking agent is prepared through polymerization reaction, centrifugal separation and drying by using a methacrylate, a methallyl nickel chloride dimer, 4-vinylbenzocyclobutene, a mercapto-beta-cyclodextrin and an initiator; the prepared BOPP waste discharge adhesive tape has excellent mechanical properties, low light transmittance and good light shielding performance.

Description

Technical Field

[0001] This invention relates to the field of adhesive tape technology, and in particular to a method for preparing BOPP waste discharge tape. Background Technology

[0002] Adhesive tape substrate is one of the main applications of biaxially oriented polypropylene film. Nationwide, adhesive tape has a wide range of applications. Although the total production volume of adhesive tape is constantly increasing, the market potential is enormous. It can be said that adhesive tape is used in virtually all products packaged in cardboard boxes, office supplies for enterprises and institutions, and household daily necessities.

[0003] Chinese Patent CN107365450A discloses a method for preparing BOPP film for tape, including the following steps: (1) immersing polypropylene resin masterbatch in an immersion solution for 2-3 hours; (2) adding the immersed polypropylene resin masterbatch and additives to a high-speed mixer, mixing and stirring evenly, and then adding it to an extruder to cast the raw material into a sheet; (3) stretching the cast raw material sheet longitudinally and laterally to obtain the finished product, wherein the longitudinal stretching temperature is 140-150℃ and the stretching ratio is 6 times, and the lateral stretching temperature is 160-170℃ and the stretching ratio is 8 times.

[0004] Chinese Patent CN108865015A: This invention relates to a BOPP sealing tape and its preparation method. The pressure-sensitive adhesive used is made from the following raw materials in parts by weight according to a certain method: 20-33 parts sodium alkyl succinate sulfonate, 75-85 parts acrylic acid, 75-85 parts hydroxyethyl ester, 5800-6200 parts butyl acrylate, 1-2 parts defoamer, 3-7 parts thiol, 8-12 parts sodium bicarbonate, 1400-1600 parts isooctyl ester, 80-100 parts methacrylic acid, 70-90 parts dimethyl ester, 8-10 parts sodium persulfate, 45-55 parts potassium persulfate, 7-10 parts metasulfite, 5-9 parts tert-butyl, 3-7 parts wetting agent, 50-70 parts sodium hydroxide, 4000-4500 parts deionized water, 15-25 parts alcohol, and 50-70 parts water-based adhesive.

[0005] Chinese Patent CN115651555B relates to a BOPP sealing tape and its preparation method, belonging to the field of polymer materials technology. The sealing tape comprises, by weight, 100 parts PP slurry, 8-12 parts toughening agent, 5-10 parts thermally expandable microspheres, and 1-1.5 parts antioxidant. The toughening agent is a branched flexible silicon chain with formamide end-capping structure, exhibiting good compatibility with polypropylene. It interpenetrates with the polypropylene polymer chains, weakening the inter-chain forces and increasing the toughness of the polypropylene. The tape uses acrylonitrile and methyl methacrylate as film-forming materials and isooctane as a thermal phase change material. Thermally expandable microspheres are prepared using a liquid-phase method and mixed into the polypropylene using a slurry method. When transporting high-temperature media, the thermally expandable microspheres expand upon heating, squeezing the tape into the assembly gaps to form a stronger interlocking effect, thereby providing stronger anti-seepage sealing capabilities.

[0006] The BOPP tapes prepared using the above patents and existing technologies have poor light-shielding properties, and their mechanical properties need further improvement. Summary of the Invention

[0007] To address the above problems, this invention provides a method for preparing BOPP waste discharge tape, the operation steps of which are as follows:

[0008] S1: By weight, mix 50-60 parts of BOPP raw material F280, 0.1-1 parts of anti-blocking agent, and 1-5 parts of color masterbatch PP5012 evenly, then feed the mixture into an extruder for extrusion and chill molding.

[0009] S2: The formed tape is stretched longitudinally, stretched laterally, pulled, surface corona-treated, wound, aged, slit and packaged to obtain BOPP waste discharge tape.

[0010] The extrusion temperature of the extruder is 240-260℃.

[0011] The longitudinal stretching temperature is 130-140℃, and the stretching ratio is 5-6 times.

[0012] The temperature for the transverse stretching is 155-175℃, and the stretching ratio is 7-9 times.

[0013] The surface corona treatment is 38-41 dynes / cm.

[0014] The thickness of the BOPP waste discharge tape is 20-30μm.

[0015] The method for preparing the anti-adhesion agent includes the following steps:

[0016] T1: Raw material preparation: by weight, 80-90 parts methacrylate, 2-6 parts methyl allyl nickel chloride dimer (CAS: 12145-60-7), 0.08-0.4 parts 4-vinylbenzocyclobutene, 11-22 parts mercapto-β-cyclodextrin (CAS No. 81644-55-5), and 0.5-2 parts initiator;

[0017] T2: Polymerization reaction: Place the prepared raw materials into a reaction vessel and carry out the polymerization reaction at a temperature of 60-90℃ for 4-8 hours;

[0018] T3: Post-processing step: The product after polymerization reaction is centrifuged and dried to obtain an anti-blocking agent.

[0019] The initiator is azobisisobutyronitrile or benzoyl peroxide.

[0020] Reaction mechanism

[0021] In this invention, the initiator free radical reacts with the thiol group (-SH) on the thiol-β-cyclodextrin, abstracting a hydrogen atom from the thiol group to generate a thiol free radical (RS·). The methylallyl nickel chloride dimer acts as a crosslinking agent to promote the reaction and the formation of the polymer structure.

[0022] Technical effect

[0023] The present invention provides a method for preparing BOPP waste discharge tape. Compared with the prior art, the present invention has the following significant advantages:

[0024] 1. Excellent anti-adhesion properties

[0025] β-cyclodextrin possesses a unique cavity structure that can encapsulate small molecules, reducing the stickiness on the tape surface and thus lowering the adhesion between tapes. Simultaneously, the polymer network structure formed through the click polymerization of thiol-olefins can create a uniform protective film on the tape surface, further isolating direct contact between tapes and effectively preventing adhesion during storage and use.

[0026] The polymer formed by the polymerization of monomers such as methyl methacrylate and 4-vinylbenzocyclobutene has a certain degree of hardness and rigidity, which can increase the roughness of the tape surface, reduce the contact area, and thus reduce the possibility of adhesion.

[0027] 2. Good chemical stability

[0028] The participation of methylallyl nickel chloride dimer in the reaction imparts a certain degree of chemical stability to the anti-blocking agent. This allows the anti-blocking agent to maintain its performance under different environmental conditions, without its anti-blocking effect decreasing due to external factors. This is crucial for the performance stability of BOPP waste discharge tape in different storage and usage environments. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description is provided in conjunction with embodiments and comparative examples:

[0030] 1. Tensile strength test: The test shall be conducted in accordance with GB / T1302;

[0031] 2. Light transmittance test: The test shall be conducted in accordance with GB / T2410.

[0032] Example 1

[0033] A method for preparing BOPP waste discharge tape, the operation steps of which are as follows:

[0034] S1: Mix 50g of BOPP raw material F280, 0.1g of anti-blocking agent, and 1g of color masterbatch PP5012 evenly, then extrude the mixture in an extruder and chill it to form the final product.

[0035] S2: The formed tape is stretched longitudinally, stretched laterally, pulled, surface corona-treated, wound, aged, slit and packaged to obtain BOPP waste discharge tape.

[0036] The extrusion temperature of the extruder is 240°C.

[0037] The longitudinal stretching temperature is 130℃, and the stretching ratio is 5 times.

[0038] The transverse stretching temperature is 155℃, and the stretching ratio is 7 times.

[0039] The surface corona treatment is 38 dynes / cm.

[0040] The thickness of the BOPP waste discharge tape is 20μm.

[0041] The method for preparing the anti-adhesion agent includes the following steps:

[0042] T1: Raw material preparation: 80g methacrylate, 2g allyl nickel chloride dimer CAS: 12145-60-7, 0.08g 4-vinylbenzocyclobutene, 11g mercapto-β-cyclodextrin CAS No. 81644-55-5, 0.5g initiator;

[0043] T2: Polymerization reaction: Place the prepared raw materials into a reaction vessel and carry out the polymerization reaction at 60°C for 4 hours;

[0044] T3: Post-processing step: The product after polymerization reaction is centrifuged and dried to obtain an anti-blocking agent.

[0045] The initiator is azobisisobutyronitrile.

[0046] Example 2

[0047] A method for preparing BOPP waste discharge tape, the operation steps of which are as follows:

[0048] S1: Mix 53g of BOPP raw material F280, 0.5g of anti-blocking agent, and 2g of color masterbatch PP5012 evenly, then extrude the mixture in an extruder and chill it to form the final product.

[0049] S2: The formed tape is stretched longitudinally, stretched laterally, pulled, surface corona-treated, wound, aged, slit and packaged to obtain BOPP waste discharge tape.

[0050] The extrusion temperature of the extruder is 245°C.

[0051] The longitudinal stretching temperature is 135℃, and the stretching ratio is 5 times.

[0052] The transverse stretching temperature is 160℃, and the stretching ratio is 8 times.

[0053] The surface corona treatment is 39 dynes / cm.

[0054] The thickness of the BOPP waste discharge tape is 25μm.

[0055] The method for preparing the anti-adhesion agent includes the following steps:

[0056] T1: Raw material preparation: 83g methacrylate, 3g allyl nickel chloride dimer CAS: 12145-60-7, 0.1g 4-vinylbenzocyclobutene, 15g mercapto-β-cyclodextrin CAS No. 81644-55-5, 1g initiator;

[0057] T2: Polymerization reaction: Place the prepared raw materials into a reaction vessel and carry out the polymerization reaction at 70°C for 5 hours;

[0058] T3: Post-processing step: The product after polymerization reaction is centrifuged and dried to obtain an anti-blocking agent.

[0059] The initiator is azobisisobutyronitrile.

[0060] Example 3

[0061] A method for preparing BOPP waste discharge tape, the operation steps of which are as follows:

[0062] S1: Mix 58g of BOPP raw material F280, 0.8g of anti-blocking agent, and 4g of color masterbatch PP5012 evenly, then extrude the mixture in an extruder and chill it to form the final product.

[0063] S2: The formed tape is stretched longitudinally, stretched laterally, pulled, surface corona-treated, wound, aged, slit and packaged to obtain BOPP waste discharge tape.

[0064] The extrusion temperature of the extruder is 255°C.

[0065] The longitudinal stretching temperature is 135℃, and the stretching ratio is 6 times.

[0066] The transverse stretching temperature is 160℃, and the stretching ratio is 8 times.

[0067] The surface corona treatment is 40 dynes / cm.

[0068] The thickness of the BOPP waste discharge tape is 25μm.

[0069] The method for preparing the anti-adhesion agent includes the following steps:

[0070] T1: Raw material preparation: 88g methacrylate, 5g allyl nickel chloride dimer CAS: 12145-60-7, 0.3g 4-vinylbenzocyclobutene, 19g mercapto-β-cyclodextrin CAS No. 81644-55-5, 1.5g initiator;

[0071] T2: Polymerization reaction: Place the prepared raw materials into a reaction vessel and carry out the polymerization reaction at 80°C for 7 hours;

[0072] T3: Post-processing step: The product after polymerization reaction is centrifuged and dried to obtain an anti-blocking agent.

[0073] The initiator is benzoyl peroxide.

[0074] Example 4

[0075] A method for preparing BOPP waste discharge tape, the operation steps of which are as follows:

[0076] S1: Mix 60g of BOPP raw material F280, 1g of anti-blocking agent, and 5g of color masterbatch PP5012 evenly, then extrude the mixture into an extruder and chill it for molding.

[0077] S2: The formed tape is stretched longitudinally, stretched laterally, pulled, surface corona-treated, wound, aged, slit and packaged to obtain BOPP waste discharge tape.

[0078] The extrusion temperature of the extruder is 260°C.

[0079] The longitudinal stretching temperature is 140℃, and the stretching ratio is 6 times.

[0080] The transverse stretching temperature is 175℃, and the stretching ratio is 9 times.

[0081] The surface corona treatment is 41 dynes / cm.

[0082] The thickness of the BOPP waste discharge tape is 30μm.

[0083] The method for preparing the anti-adhesion agent includes the following steps:

[0084] T1: Raw material preparation: 90g methacrylate, 6g allyl nickel chloride dimer CAS: 12145-60-7, 0.4g 4-vinylbenzocyclobutene, 22g mercapto-β-cyclodextrin CAS No. 81644-55-5, 2g initiator;

[0085] T2: Polymerization reaction: Place the prepared raw materials into a reaction vessel and carry out the polymerization reaction at 90°C for 8 hours;

[0086] T3: Post-processing step: The product after polymerization reaction is centrifuged and dried to obtain an anti-blocking agent.

[0087] The initiator is benzoyl peroxide.

[0088] Comparative Example 1

[0089] No anti-blocking agent was added; otherwise, it was the same as in Example 1.

[0090] Comparative Example 2

[0091] Without adding allyl nickel chloride dimer, otherwise the same as in Example 1.

[0092] Comparative Example 3

[0093] Without adding thiol-β-cyclodextrin, otherwise the same as in Example 1.

[0094] The test results of the examples and comparative examples are shown in Table 1.

[0095] Table 1

[0096]

[0097]

[0098] Based on the data analysis of the above embodiments and comparative examples, the BOPP waste discharge tape prepared by the present invention has excellent mechanical properties, low light transmittance, and good light-blocking performance.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing BOPP waste discharge tape, comprising the following steps: S1: By weight, mix 50-60 parts of BOPP raw material, 0.1-1 parts of anti-blocking agent, and 1-5 parts of color masterbatch evenly, then extrude the mixture into an extruder and chill it for molding. S2: The formed tape is stretched longitudinally and laterally, pulled, surface corona-treated, wound, aged, slit and packaged to obtain BOPP waste discharge tape; The method for preparing the anti-adhesion agent Includes the following steps: T1: Raw material preparation: by weight, 80-90 parts methacrylate, 2-6 parts allyl nickel chloride dimer, 0.08-0.4 parts 4-vinylbenzocyclobutene, 11-22 parts mercapto-β-cyclodextrin, 0.5-2 parts initiator; T2: Polymerization reaction: Place the prepared raw materials into a reaction vessel and carry out the polymerization reaction at a temperature of 60-90℃ for 4-8 hours; T3: Post-processing step: The product after polymerization reaction is centrifuged and dried to obtain an anti-blocking agent.

2. The method for preparing a BOPP waste discharge tape according to claim 1, characterized in that: The extrusion temperature of the extruder is 240-260℃.

3. The method for preparing a BOPP waste discharge tape according to claim 1, characterized in that: The longitudinal stretching temperature is 130-140℃, and the stretching ratio is 5-6 times.

4. The method for preparing a BOPP waste discharge tape according to claim 1, characterized in that: The transverse stretching temperature is 155-175℃, and the stretching ratio is 7-9 times.

5. The method for preparing a BOPP waste discharge tape according to claim 1, characterized in that: The surface corona treatment is 38-41 dynes / cm.

6. The method for preparing a BOPP waste discharge tape according to claim 1, characterized in that: The thickness of the BOPP waste discharge tape is 20-30 μm.

7. The method for preparing a BOPP waste discharge tape according to claim 1, characterized in that: The initiator is azobisisobutyronitrile or benzoyl peroxide.

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