Preparation method of BOPP waste discharge adhesive tape

Abstract

The invention relates to a preparation method of a BOPP waste discharge adhesive tape, and belongs to the technical field of adhesive tapes. The method comprises the following steps: uniformly stirring and mixing a BOPP raw material, an anti-blocking agent and a color master batch, extruding in an extruder, chilling and forming, and carrying out longitudinal stretching, transverse stretching, traction, surface corona, rolling, aging treatment, slitting and packaging on the formed adhesive tape to obtain the BOPP waste discharge adhesive tape. The anti-blocking agent disclosed by the invention is prepared from methacrylate, a methallyl nickel chloride dimer, 4-vinyl benzocyclobutene, sulfydryl-beta-cyclodextrin and an initiator through a polymerization reaction, centrifugal separation and drying. The BOPP waste discharge adhesive tape prepared by the invention has excellent mechanical properties, low light transmittance and good shading performance.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tapes, in particular to a method for preparing a BOPP waste-discharging adhesive tape. Background Art

[0002] Adhesive tape substrate is one of the main uses of biaxially oriented polypropylene film. In the whole country, the application scope of adhesive tape is quite wide. Although the total production volume of adhesive tape is constantly expanding, the market potential is very large. It can be said that all products with carton packaging, office appliances of enterprises and institutions, and household daily necessities basically use adhesive tape.

[0003] Chinese patent CN107365450A: discloses a method for preparing BOPP film for adhesive tape, comprising the following steps: (1) placing polypropylene resin masterbatch into a soaking liquid and soaking for 2-3 hours; (2) adding the soaked polypropylene resin masterbatch and additives into a high-speed mixer, mixing and stirring evenly, adding them into an extruder, and casting a raw material cast sheet; (3) stretching the formed raw material cast sheet longitudinally and transversely to obtain a finished product, wherein the longitudinal stretching temperature is 140-150°C, the stretching ratio is 6 times, and the transverse stretching temperature is 160-170°C, the stretching ratio is 8 times.

[0004] Chinese patent CN108865015A: It is 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 of sodium succinate alkyl sulfonate, 75-85 parts of acrylic acid, 75-85 parts of hydroxyethyl ester, 5800-6200 parts of butyl acrylate, 1-2 parts of defoamer, 3-7 parts of mercaptan, 8-12 parts of sodium bicarbonate, 1400-1600 parts of isooctyl ester, 80-100 parts of methacrylic acid, 70-90 parts of dimethyl ester, 8-10 parts of sodium persulfate, 45-55 parts of potassium persulfate, 7-10 parts of metabisulfite, 5-9 parts of tert-butyl, 3-7 parts of wetting agent, 50-70 parts of sodium hydroxide, 4000-4500 parts of ionized water, 15-25 parts of alcohol and 50-70 parts of water-based glue.

[0005] Chinese patent CN115651555B: relates to a BOPP sealing tape and its preparation method, belonging to the technical field of polymer materials. The sealing tape includes, by weight: 100 parts of PP slurry, 8-12 parts of toughening agent, 5-10 parts of heat-expandable microspheres and 1-1.5 parts of antioxidant; wherein the toughening agent is a branched flexible silicon chain and a formamide-terminated structure, which has good compatibility with polypropylene, interpenetrates with the polypropylene polymer chain, weakens the force between the polypropylene polymer chains, and increases the toughness of polypropylene; it uses acrylonitrile, methyl methacrylate, etc. as film-forming materials, and isooctane as a thermal phase change material, and heat-expandable microspheres are made by liquid phase method, which are mixed into polypropylene by slurry method. When transporting high-temperature media, the heat-expandable microspheres expand due to heat, squeeze the tape into the assembly gap, and form a stronger interlocking effect, thereby having a stronger anti-seepage sealing ability.

[0006] The BOPP tapes prepared by the above patents and prior art have poor light-shielding properties and their mechanical properties need to be further improved. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a method for preparing a BOPP waste discharge tape, and the operating steps are as follows:

[0008] S1: According to weight, 50-60 parts of BOPP raw material F280, 0.1-1 parts of anti-blocking agent, and 1-5 parts of color masterbatch PP5012 are stirred and mixed evenly, and then fed into an extruder for extrusion and chilled to form:

[0009] S2: The formed tape is longitudinally stretched, transversely stretched, pulled, surface corona treated, rolled, aging treated, slit and packaged to obtain a BOPP waste discharge tape.

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

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

[0012] The temperature of the transverse stretching is 155-175° C., 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 20-30 μm.

[0015] The preparation method of the anti-adhesive agent comprises the following steps:

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

[0017] T2: Polymerization reaction: Place the prepared raw materials in a reaction vessel and perform polymerization reaction at a temperature of 60-90° C. for 4-8 hours;

[0018] T3: Post-treatment process: The product after the 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 the present invention, the initiator free radical reacts with the thiol (-SH) on the thiol-β-cyclodextrin to capture the hydrogen atom on the thiol, thereby generating a thiol free radical (RS·), and the methallyl nickel chloride dimer acts as a crosslinking agent to promote the reaction and the formation of the polymer structure.

[0022] Technical Effects

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

[0024] 1. Excellent anti-adhesion performance

[0025] β-cyclodextrin has a unique cavity structure that can encapsulate some small molecules, reduce the sticky substances on the surface of the tape, and thus reduce the adhesion between the tapes. At the same time, the polymer network structure formed by the thiol-olefin click chemistry polymerization reaction can form a uniform protective film on the surface of the tape, further isolating the direct contact between the tapes, and effectively preventing the tapes from sticking during storage and use.

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

[0027] 2. Good chemical stability

[0028] After the methallyl nickel chloride dimer participates in the reaction, it can give the anti-blocking agent a certain chemical stability. This allows the anti-blocking agent to maintain its performance under different environmental conditions and will not cause the anti-blocking effect to decrease due to the influence of external factors. This is crucial for the performance stability of BOPP waste discharge tape in different storage and use environments. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description in combination with embodiments and comparative examples:

[0030] 1. Tensile strength test: measured in accordance with GB / T1302;

[0031] 2. Light transmittance test: Measured in accordance with GB / T2410.

[0032] Example 1

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

[0034] S1: 50g BOPP raw material F280, 0.1g anti-blocking agent, and 1g color masterbatch PP5012 are stirred and mixed evenly, and then sent into the extruder for extrusion and chilled to form:

[0035] S2: The formed tape is longitudinally stretched, transversely stretched, pulled, surface corona treated, rolled, aging treated, slit and packaged to obtain a BOPP waste discharge tape.

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

[0037] The longitudinal stretching temperature is 130° C. and the stretching ratio is 5 times.

[0038] The temperature of the transverse stretching is 155° C., 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 20 μm.

[0041] The preparation method of the anti-adhesive agent comprises the following steps:

[0042] T1: Raw material preparation: 80g methacrylate, 2g methallyl 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: the raw materials prepared above are placed in a reaction vessel and subjected to polymerization reaction at a temperature of 60° C. for 4 hours;

[0044] T3: Post-treatment process: The product after the 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 a BOPP waste discharge tape, the operating steps of which are as follows:

[0048] S1: 53g BOPP raw material F280, 0.5g anti-blocking agent, and 2g color masterbatch PP5012 are stirred and mixed evenly, and then sent into the extruder for extrusion and chilled to form:

[0049] S2: The formed tape is longitudinally stretched, transversely stretched, pulled, surface corona treated, rolled, aging treated, slit and packaged to obtain a BOPP waste discharge tape.

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

[0051] The longitudinal stretching temperature is 135° C. and the stretching ratio is 5 times.

[0052] The temperature of the transverse stretching is 160° C., 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 25 μm.

[0055] The preparation method of the anti-adhesive agent comprises the following steps:

[0056] T1: Raw material preparation: 83g methacrylate, 3g methallyl 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: the raw materials prepared above are placed in a reaction vessel and subjected to polymerization reaction at 70°C for 5 hours;

[0058] T3: Post-treatment process: The product after the 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 a BOPP waste discharge tape, the operating steps of which are as follows:

[0062] S1: 58g BOPP raw material F280, 0.8g anti-blocking agent, and 4g color masterbatch PP5012 are stirred and mixed evenly, and then sent into the extruder for extrusion and chilled molding:

[0063] S2: The formed tape is longitudinally stretched, transversely stretched, pulled, surface corona treated, rolled, aging treated, slit and packaged to obtain a BOPP waste discharge tape.

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

[0065] The longitudinal stretching temperature is 135° C. and the stretching ratio is 6 times.

[0066] The temperature of the transverse stretching is 160° C., 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 25 μm.

[0069] The preparation method of the anti-adhesive agent comprises the following steps:

[0070] T1: Raw material preparation: 88g methacrylate, 5g methallyl 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: the raw materials prepared above are placed in a reaction vessel and subjected to polymerization reaction at 80°C for 7 hours;

[0072] T3: Post-treatment process: The product after the 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 a BOPP waste discharge tape, the operating steps of which are as follows:

[0076] S1: 60g BOPP raw material F280, 1g anti-blocking agent, 5g color masterbatch PP5012 are stirred and mixed evenly, and then sent into the extruder for extrusion and chilled molding:

[0077] S2: The formed tape is longitudinally stretched, transversely stretched, pulled, surface corona treated, rolled, aging treated, slit and packaged to obtain a BOPP waste discharge tape.

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

[0079] The longitudinal stretching temperature is 140° C. and the stretching ratio is 6 times.

[0080] The temperature of the transverse stretching is 175° C., 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 30 μm.

[0083] The preparation method of the anti-adhesive agent comprises the following steps:

[0084] T1: Raw material preparation: 90g methacrylate, 6g methallyl 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: the raw materials prepared above are placed in a reaction vessel and subjected to polymerization reaction at 90°C for 8 hours;

[0086] T3: Post-treatment process: The product after the 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, and the rest was the same as in Example 1.

[0090] Comparative Example 2

[0091] The methallyl nickel chloride dimer was not added, and the other steps were the same as in Example 1.

[0092] Comparative Example 3

[0093] Without adding mercapto-β-cyclodextrin, the other steps were the same as those in Example 1.

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

[0095] Table 1

[0096]

[0097]

[0098] Through 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-shielding performance.

[0099] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a BOPP waste discharge tape, the operating steps of which are: S1: According to weight, 50-60 parts of BOPP raw material, 0.1-1 parts of anti-blocking agent, and 1-5 parts of color masterbatch are stirred and mixed evenly, and then sent into the extruder for extrusion and chilled to form: S2: The formed tape is subjected to longitudinal stretching, transverse stretching, pulling, surface corona treatment, winding, aging treatment, slitting and packaging to obtain BOPP waste discharge tape; The anti-adhesive agent is prepared by reacting methacrylate, methallyl nickel chloride dimer, 4-vinylbenzocyclobutene and mercapto-β-cyclodextrin.

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°C.

3. The method for preparing a BOPP waste discharge tape according to claim 1, characterized in that: The temperature of the longitudinal stretching is 130-140° C., 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 temperature of the transverse stretching is 155-175° C., 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 preparation method of the anti-adhesion agent The following steps are involved: T1: Raw material preparation: by weight, 80-90 parts of methacrylate, 2-6 parts of methallyl nickel chloride dimer, 0.08-0.4 parts of 4-vinylbenzocyclobutene, 11-22 parts of mercapto-β-cyclodextrin, and 0.5-2 parts of initiator; T2: Polymerization reaction: Place the prepared raw materials in a reaction vessel and perform polymerization reaction at a temperature of 60-90° C. for 4-8 hours; T3: Post-treatment process: The product after the polymerization reaction is centrifuged and dried to obtain an anti-blocking agent.

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

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