Cotton packaging film splicing adhesive tape as well as preparation method and application thereof

Abstract

The invention relates to a cotton packaging film splicing adhesive tape and a preparation method and application thereof. The cotton packaging film splicing adhesive tape comprises a base film layer, a silicone oil film layer and an adhesive film layer. Wherein the base film layer comprises an outer layer, a middle layer and an inner layer; the silicone oil film layer is formed on one surface of the inner layer of the base film layer; the adhesive film layer is formed on one side of the outer layer of the base film layer. The method has the advantages that the splicing adhesive tape and the cotton packaging film are made of polyethylene, the shrinkage rates are similar, the splicing adhesive tape is not prone to falling off due to different shrinkage rates, and the storage time of packaged cotton is prolonged; in addition, the splicing adhesive tape is provided with release, so that a layer of release film does not need to be compounded on the adhesive, the cost of one layer of release film is reduced, the production process is simplified, and the production efficiency is improved; in addition, the splicing adhesive tape has the advantages of being good in anti-aging performance, good in toughness, good in puncture resistance, good in high and low temperature resistance and the like.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tapes, and in particular to a cotton packaging film splicing adhesive tape, a preparation method thereof and an application thereof. Background Art

[0002] In the modern agricultural cotton picking and processing process, cotton pickers use cotton baling film to pack the picked cotton, which has become an indispensable part. Compared with the traditional manual picking method, mechanized picking not only significantly improves the picking efficiency, but also effectively protects the quality of cotton, greatly facilitating the transportation and long-term storage of cotton. However, with the widespread application of mechanized picking technology, the demand for cotton baling film has also surged.

[0003] Usually, cotton packaging film is made up of 24 pieces of packaging film, and each piece of unit film is composed of two parts: self-adhesive film and non-self-adhesive film. When splicing these film pieces, the traditional method is to use tape for bonding. The splicing tape widely used in the market is mainly PET tape with isolation film.

[0004] However, due to the difference in the materials of PET tape and PE cotton packaging film, the shrinkage rates of the two are inconsistent. In the case of long-term use or changes in environmental conditions, this material mismatch problem is particularly prominent, making the joints of the cotton packaging film prone to falling off. This not only affects the overall effect of cotton packaging, but may also cause the cotton to explode after packaging, thereby greatly reducing the storage time and use effect of the cotton packaging film.

[0005] Currently, no effective solution has been proposed for the problem that the splicing tape in the related art is prone to falling off at the splicing position under long-term use or changes in environmental conditions. Summary of the invention

[0006] The purpose of the present invention is to provide a cotton packing film splicing tape and a preparation method and application thereof in view of the deficiencies in the prior art, so as to solve the problems existing in the related art such as the splicing tape being prone to falling off at the splicing position under long-term use or changes in environmental conditions.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a cotton packaging film splicing tape, comprising:

[0009] The base film layer comprises an outer layer, a middle layer and an inner layer, and is prepared by a three-layer co-extrusion film blowing machine, and the raw material formula of the base film layer comprises metallocene low-density polyethylene, low-density polyethylene, an anti-aging agent, an anti-blocking agent, linear low-density polyethylene, and a yellow masterbatch;

[0010] A silicone oil film layer, wherein the silicone oil film layer is formed on one side of the inner layer of the base film layer, and the raw material formula of the silicone oil film layer includes light-peeling silicone acrylate, tight-peeling silicone acrylate, and a photosensitizer;

[0011] An adhesive film layer, wherein the adhesive film layer is formed on one side of the outer layer of the base film layer, and the raw material formula of the adhesive film layer includes 2-ethylhexyl acrylate, methyl acrylate, acrylic acid, an initiator, a cross-linking agent, and a tackifying resin rosin glycerol ester;

[0012] Wherein, for the outer layer, the mass fraction of the metallocene low-density polyethylene is 60-80%, the mass fraction of the low-density polyethylene is 20-40%, the mass fraction of the anti-aging agent is 1-6%, and the mass fraction of the opening agent is 1-4%;

[0013] Wherein, for the middle layer, the mass fraction of the metallocene low-density polyethylene is 60-80%, the mass fraction of the linear low-density polyethylene is 20-30%, the mass fraction of the yellow masterbatch is 4-8%, and the mass fraction of the opening agent is 1-4%;

[0014] Wherein, for the inner layer, the mass fraction of the metallocene low-density polyethylene is 60-80%, the mass fraction of the low-density polyethylene is 20-40%, the mass fraction of the anti-aging agent is 1-6%, and the mass fraction of the opening agent is 1-4%;

[0015] Wherein, for the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 60-75%, the mass fraction of the tight-peeling silicone acrylate is 20-35%, and the mass fraction of the photosensitizer is 1-2%;

[0016] Among them, for the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 70-80%, the mass fraction of methyl acrylate is 10-20%, the mass fraction of acrylic acid is 2-5%, the mass fraction of the initiator is 0.1-0.5%, the mass fraction of the cross-linking agent is 0.5-2%, and the mass fraction of the tackifying resin rosin glycerol ester is 5-10%.

[0017] In some embodiments, the anti-aging agent includes one or more of an amine anti-aging agent, a phenolic anti-aging agent, a heterocyclic anti-aging agent, and a phosphite anti-aging agent.

[0018] In some embodiments, the opening agent includes one or more of erucamide, ethylene bisstearamide, talc, diatomaceous earth, and silicon dioxide.

[0019] In some embodiments, the photosensitizer includes one or more of an organic photosensitizer, an inorganic photosensitizer, a polymer photosensitizer, a sol-gel photosensitizer, a biological photosensitizer, and an organosilicon photosensitizer.

[0020] In some embodiments, the initiator includes one or more of benzoyl peroxide, tert-butyl hydroperoxide, and di-tert-butyl peroxide.

[0021] In some embodiments, the crosslinking agent includes one or more of aziridine, polycarbodiimide crosslinking agent, epoxy resin crosslinking agent, metal ion crosslinking agent and melamine-formaldehyde crosslinking agent.

[0022] In some embodiments, the mass ratio of the outer layer, the middle layer, and the inner layer is 30:40:30.

[0023] In a second aspect, the present invention further provides a method for preparing a cotton packing film splicing tape, which is used to prepare the cotton packing film splicing tape as described in the first aspect, and is characterized by comprising:

[0024] Weigh the raw materials of the outer layer, the middle layer, and the inner layer according to the mass ratio of the outer layer, the middle layer, and the inner layer, respectively, and mix them in a mixer for 5 minutes to 10 minutes to obtain a first mixed raw material, a second mixed raw material, and a third mixed raw material;

[0025] The first mixed raw material, the second mixed raw material and the third mixed raw material are respectively loaded into the first hopper, the second hopper and the third hopper of the three-layer co-extrusion blow molding machine, and three-layer co-extrusion blow molding is performed to obtain a base film layer;

[0026] A silicone oil film layer is applied on one side of the base film layer by using a UV light curing coater, and the silicone oil film layer is rolled up on the base film layer by irradiation with a mercury lamp protected by nitrogen;

[0027] A heat curing coating machine is used to apply an adhesive film layer on the other side of the base film layer, and the splicing tape is rolled up;

[0028] Wherein, for the outer layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%;

[0029] Wherein, for the middle layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of linear low-density polyethylene is 20-30%, the mass fraction of yellow masterbatch is 4-8%, and the mass fraction of the opening agent is 1-4%;

[0030] Wherein, for the inner layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%;

[0031] Wherein, for the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 60-75%, the mass fraction of the tight-peeling silicone acrylate is 20-35%, and the mass fraction of the photosensitizer is 1-2%;

[0032] Among them, for the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 70-80%, the mass fraction of methyl acrylate is 10-20%, the mass fraction of acrylic acid is 2-5%, the mass fraction of initiator is 0.1-0.5%, the mass fraction of cross-linking agent is 0.5-2%, and the mass fraction of tackifying resin rosin glycerol ester is 5-10%.

[0033] In some embodiments, the melt extrusion temperature of the outer layer, the middle layer and the inner layer is 160°C to 170°C, and the film blowing temperature is 150°C to 170°C.

[0034] In some embodiments, the dry silicon content of the silicone oil film is 0.8-1.5 g / m 2 The oxygen content of the silicone oil film is less than 50 PPM, the machine speed of the UV light curing coater is 150-200 m / min, the UV wavelength of the mercury lamp is 200 nm-450 nm, and the power of the mercury lamp is 200-400 W / cm 2 .

[0035] In some embodiments, the weight of the adhesive film layer is 20-30 g / m 2 The machine speed of the thermal curing coating machine is 40-60 m / min.

[0036] In a third aspect, the present invention further provides an application of a cotton packing film splicing tape based on the first aspect in cotton packing film, wherein the non-self-adhesive film and the self-adhesive film are spliced ​​by the cotton packing film splicing tape.

[0037] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0038] The present invention discloses a cotton packing film splicing tape, a preparation method and an application thereof. The splicing tape and the cotton packing film are made of polyethylene and have similar shrinkage rates. The splicing tape is not easy to fall off due to different shrinkages, thereby extending the storage time of the packaged cotton. In addition, the splicing tape has its own release function and does not need to be compounded with an adhesive to form a layer of release film, thereby reducing the cost of a layer of release film, simplifying the production process and improving production efficiency. Furthermore, the splicing tape has good anti-aging performance, and the aging time can reach 1 year, thereby increasing the service life of the product. The splicing tape has good toughness and good puncture resistance, and the spliced ​​packing film is not easily damaged, thereby improving product reliability. The splicing tape has good high and low temperature resistance, and the high temperature can reach 70 degrees and the low temperature can reach -50 degrees, thereby being adaptable to a variety of packing environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the application of cotton packaging film splicing tape in cotton packaging film. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0041] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0043] Example 1

[0044] This embodiment relates to the cotton packing film splicing tape of the present invention.

[0045] An illustrative embodiment of the present invention is a cotton packing film splicing tape, comprising a base film layer, a silicone oil film layer and an adhesive film layer. The base film layer comprises an outer layer, a middle layer and an inner layer, and is prepared by a three-layer co-extrusion film blowing machine, and the raw material formula of the base film layer comprises metallocene low-density polyethylene, low-density polyethylene, an anti-aging agent, an anti-blocking agent, a linear low-density polyethylene, and a yellow masterbatch; the silicone oil film layer is formed on one side of the inner layer of the base film layer, and the raw material formula of the silicone oil film layer comprises light-peeling silicone acrylate, tight-peeling silicone acrylate, and a photosensitizer; the adhesive film layer is formed on one side of the outer layer of the base film layer, and the raw material formula of the adhesive film layer comprises 2-ethylhexyl acrylate, methyl acrylate, acrylic acid, an initiator, a cross-linking agent, and a tackifying resin rosin glycerol ester.

[0046] It should be noted that, for the outer layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%.

[0047] In some of the embodiments, for the outer layer, the mass fraction of the metallocene low-density polyethylene is 60%, the mass fraction of the low-density polyethylene is 36%, the mass fraction of the anti-aging agent is 2%, and the mass fraction of the anti-blocking agent is 2%.

[0048] It should be noted that, for the middle layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of linear low-density polyethylene is 20-30%, the mass fraction of yellow masterbatch is 4-8%, and the mass fraction of the opening agent is 1-4%.

[0049] In some of the embodiments, for the middle layer, the mass fraction of the metallocene low-density polyethylene is 60%, the mass fraction of the linear low-density polyethylene is 32%, the mass fraction of the yellow masterbatch is 6%, and the mass fraction of the opening agent is 2%.

[0050] It should be noted that, for the inner layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%.

[0051] In some of the embodiments, for the inner layer, the mass fraction of the metallocene low-density polyethylene is 60%, the mass fraction of the low-density polyethylene is 36%, the mass fraction of the anti-aging agent is 2%, and the mass fraction of the anti-blocking agent is 2%.

[0052] It should be noted that the mass ratio of the outer layer, the middle layer and the inner layer is 30:40:30.

[0053] It should be noted that, for the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 60-75%, the mass fraction of the tight-peeling silicone acrylate is 20-35%, and the mass fraction of the photosensitizer is 1-2%.

[0054] In some of the embodiments, for the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 65%, the mass fraction of the tight-peeling silicone acrylate is 35%, and the mass fraction of the photosensitizer is 2%.

[0055] It should be noted that, for the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 70-80%, the mass fraction of methyl acrylate is 10-20%, the mass fraction of acrylic acid is 2-5%, the mass fraction of the initiator is 0.1-0.5%, the mass fraction of the cross-linking agent is 0.5-2%, and the mass fraction of the tackifying resin rosin glycerol ester is 5-10%.

[0056] In some of the embodiments, for the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 71.5%, the mass fraction of methyl acrylate is 20%, the mass fraction of acrylic acid is 2%, the mass fraction of the initiator is 0.5%, the mass fraction of the cross-linking agent is 1%, and the mass fraction of the tackifying resin rosin glycerol ester is 5%.

[0057] It should be noted that the anti-aging agent includes one or more of amine anti-aging agents, phenolic anti-aging agents, heterocyclic anti-aging agents, and phosphite anti-aging agents. Preferably, the anti-aging agent is an amine anti-aging agent.

[0058] It should be noted that the opening agent includes one or more of erucic acid amide, ethylene bis stearamide, talcum powder, diatomaceous earth, and silicon dioxide. Preferably, the opening agent is silicon dioxide.

[0059] It should be noted that the photosensitizer includes one or more of an organic photosensitizer, an inorganic photosensitizer, a polymer photosensitizer, a sol-gel photosensitizer, a biological photosensitizer and an organosilicon photosensitizer. Preferably, the photosensitizer is an organosilicon photosensitizer.

[0060] It should be noted that the initiator includes one or more of benzoyl peroxide, tert-butyl hydroperoxide and di-tert-butyl peroxide. Preferably, the initiator is benzoyl peroxide.

[0061] It should be noted that the crosslinking agent includes one or more of aziridine, polycarbodiimide crosslinking agent, epoxy resin crosslinking agent, metal ion crosslinking agent and melamine-formaldehyde crosslinking agent. Preferably, the crosslinking agent is aziridine.

[0062] The advantages of this embodiment are that the splicing tape and the cotton packaging film are made of the same material, polyethylene, and have the same shrinkage rate. The splicing tape is not easy to fall off due to different shrinkage, thereby extending the storage time of the packaged cotton. In addition, the splicing tape has its own release film and does not need to be compounded with a layer of release film on the adhesive, thereby reducing the cost of a layer of release film and simplifying the production process, thereby improving production efficiency. Furthermore, the splicing tape has good anti-aging performance, and the aging time can reach 1 year, thereby increasing the service life of the product. The splicing tape has good toughness and good puncture resistance, and the packaging film after splicing is not easily damaged, thereby improving product reliability. The splicing tape has good resistance to high and low temperatures, and the high temperature can reach 70 degrees and the low temperature can reach -50 degrees, thereby being adaptable to a variety of packaging environments.

[0063] Example 2

[0064] This embodiment is a variation of Embodiment 1.

[0065] For the outer layer, the mass fraction of the metallocene low-density polyethylene is 74%, the mass fraction of the low-density polyethylene is 20%, the mass fraction of the anti-aging agent is 4%, and the mass fraction of the opening agent is 2%.

[0066] For the middle layer, the mass fraction of the metallocene low-density polyethylene is 72%, the mass fraction of the linear low-density polyethylene is 20%, the mass fraction of the yellow masterbatch is 6%, and the mass fraction of the opening agent is 2%.

[0067] For the inner layer, the mass fraction of the metallocene low-density polyethylene is 74%, the mass fraction of the low-density polyethylene is 20%, the mass fraction of the anti-aging agent is 4%, and the mass fraction of the opening agent is 2%.

[0068] For the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 70%, the mass fraction of the tight-peeling silicone acrylate is 28%, and the mass fraction of the photosensitizer is 2%.

[0069] For the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 73.5%, the mass fraction of methyl acrylate is 15%, the mass fraction of acrylic acid is 2%, the mass fraction of initiator is 0.5%, the mass fraction of cross-linking agent is 1%, and the mass fraction of tackifying resin rosin glycerol ester is 8%.

[0070] The advantages of this embodiment are the same as those of Embodiment 1, and will not be described in detail here.

[0071] Example 3

[0072] This embodiment is a variation of Embodiments 1 to 2.

[0073] For the outer layer, the mass fraction of the metallocene low-density polyethylene is 78%, the mass fraction of the low-density polyethylene is 14%, the mass fraction of the anti-aging agent is 6%, and the mass fraction of the opening agent is 2%.

[0074] For the middle layer, the mass fraction of the metallocene low-density polyethylene is 72%, the mass fraction of the linear low-density polyethylene is 20%, the mass fraction of the yellow masterbatch is 6%, and the mass fraction of the opening agent is 2%.

[0075] For the inner layer, the mass fraction of the metallocene low-density polyethylene is 78%, the mass fraction of the low-density polyethylene is 14%, the mass fraction of the anti-aging agent is 6%, and the mass fraction of the opening agent is 2%.

[0076] For the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 75%, the mass fraction of the tight-peeling silicone acrylate is 23%, and the mass fraction of the photosensitizer is 2%.

[0077] For the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 76.5%, the mass fraction of methyl acrylate is 10%, the mass fraction of acrylic acid is 2%, the mass fraction of initiator is 0.5%, the mass fraction of cross-linking agent is 1%, and the mass fraction of tackifying resin rosin glycerol ester is 10%.

[0078] The advantages of this embodiment are the same as those of Embodiment 1, and will not be described in detail here.

[0079] Example 4

[0080] This embodiment relates to a method for preparing the cotton packaging film splicing tape of the present invention.

[0081] like Figure 1 As shown, a method for preparing a cotton packaging film splicing tape comprises:

[0082] Weigh the raw materials of the outer layer, the middle layer, and the inner layer according to the mass ratio of the outer layer, the middle layer, and the inner layer, respectively, and mix them in a mixer for 5 minutes to 10 minutes to obtain a first mixed raw material, a second mixed raw material, and a third mixed raw material;

[0083] The first mixed raw material, the second mixed raw material and the third mixed raw material are respectively loaded into the first hopper, the second hopper and the third hopper of the three-layer co-extrusion blow molding machine, and three-layer co-extrusion blow molding is performed to obtain a base film layer;

[0084] A silicone oil film layer is applied on one side of the base film layer by using a UV light curing coater, and the silicone oil film layer is rolled up on the base film layer by irradiation with a mercury lamp protected by nitrogen;

[0085] A heat curing coating machine is used to apply an adhesive film layer on the other side of the base film layer, and the splicing tape is rolled up;

[0086] Wherein, for the outer layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%;

[0087] Among them, for the middle layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of linear low-density polyethylene is 20-30%, the mass fraction of yellow masterbatch is 4-8%, and the mass fraction of the opening agent is 1-4%;

[0088] Among them, for the inner layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%;

[0089] Wherein, for the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 60-75%, the mass fraction of the tight-peeling silicone acrylate is 20-35%, and the mass fraction of the photosensitizer is 1-2%;

[0090] Among them, for the film layer, the mass fraction of 2-ethylhexyl acrylate is 70-80%, the mass fraction of methyl acrylate is 10-20%, the mass fraction of acrylic acid is 2-5%, the mass fraction of initiator is 0.1-0.5%, the mass fraction of cross-linking agent is 0.5-2%, and the mass fraction of tackifying resin rosin glycerol ester is 5-10%.

[0091] It should be noted that the mass fractions of the raw materials in the outer layer, middle layer, inner layer, silicone oil film layer and adhesive film layer are as shown in Examples 1 to 3, and will not be described in detail here.

[0092] Furthermore, the melt extrusion temperature of the outer layer, the middle layer and the inner layer is 160°C to 170°C, and the film blowing temperature is 150°C to 170°C.

[0093] In some of the embodiments, the screw extruder is generally divided into multiple heating zones, namely extrusion zone 1, extrusion zone 2, extrusion zone 3, extrusion zone 4, extrusion zone 5, and extrusion zone 6. The temperature of each zone can be independently controlled to adapt to different stages of the material during the extrusion process.

[0094] Among them, the temperature of extrusion zone 1 is 150°C, the temperature of extrusion zone 2 is 160°C, the temperature of extrusion zone 3 is 160°C, the temperature of extrusion zone 4 is 165°C, the temperature of extrusion zone 5 is 170°C, and the temperature of extrusion zone 6 is 165°C.

[0095] It should be noted that Extrusion Zone 1 is the first area where the material enters the screw extruder. The temperature is relatively low, which helps the material gradually adapt to the heating environment and avoids sudden high temperatures that may cause the material to burn or degrade.

[0096] It should be noted that extrusion of zone 2 further heats the material in this area, slightly increasing the temperature, which helps the material to be better plasticized and melted.

[0097] It should be noted that the temperature of extrusion zone 3 is the same as that of extrusion zone 2. Maintaining a stable temperature can ensure that the material remains in a uniform molten state during the extrusion process.

[0098] It should be noted that the temperature of extrusion zone 4 is slightly increased, which helps to further improve the melting effect of the material and prepare for the subsequent extrusion process.

[0099] It should be noted that the temperature of extrusion zone 5 is increased again at the end of the extruder to ensure that the material reaches the best melting state before extrusion to facilitate subsequent molding.

[0100] It should be noted that the temperature in extrusion zone 6 drops slightly near the extruder outlet, but remains at a relatively high level to ensure that the material remains in a molten state when leaving the extruder, facilitating the subsequent film blowing process.

[0101] In some of the embodiments, the film blowing die head has three temperature zones, namely film blowing zone 1, film blowing zone 2, and film blowing zone 3. The temperature of each zone can be independently controlled to ensure the uniformity and quality of the film during the film blowing process.

[0102] Among them, the temperature of film blowing zone 1 is 170°C, the temperature of film blowing zone 2 is 165°C, and the temperature of film blowing zone 3 is 165°C.

[0103] It should be noted that the film blowing zone 1 is the inlet area of ​​the die head. The temperature of this area is relatively high, which helps the molten material to maintain fluidity and uniformity in the die head.

[0104] It should be noted that the film blowing zone 2 is the middle area of ​​the die head. The temperature in this area drops slightly, but still remains at a high level to ensure that the film can maintain a stable thickness and uniformity during the blowing process.

[0105] It should be noted that the film blowing zone 3 is the exit area of ​​the die head. The temperature of this zone is the same as that of the film blowing zone 2, which helps the film maintain a stable shape and quality when leaving the die head.

[0106] In some of the embodiments, the temperature of extrusion zone 1 of the screw extrusion of the outer layer, middle layer and inner layer is 160°C, the temperature of extrusion zone 2 is 165°C, the temperature of extrusion zone 3 is 165°C, the temperature of extrusion zone 4 is 175°C, the temperature of extrusion zone 5 is 175°C, and the temperature of extrusion zone 6 is 175°C; the temperature of film blowing zone 1 of the film blowing die is 180°C, the temperature of film blowing zone 2 is 170°C, and the temperature of film blowing zone 3 is 170°C.

[0107] Furthermore, the dry silicon content of the silicone oil film is 0.8 to 1.5 g / m 2 , the oxygen content of the silicone oil film is less than 50PPM, the machine speed of the UV light curing coater is 150-200m / min, the UV wavelength of the mercury lamp is 200nm-450nm, and the intensity of the mercury lamp is 200-400W / cm 2 .

[0108] In some embodiments, the dry silicon content of the silicone oil film is 1 g / m 2 The oxygen content of the silicone oil film is 40PPM, the machine speed of the UV light curing coater is 170m / min, the UV wavelength of the mercury lamp is 300nm, and the intensity of the mercury lamp is 300W / cm 2 .

[0109] Furthermore, the weight of the film layer is 20 to 30 g / m 2 , the machine speed of the thermal curing coating machine is 40-60m / min.

[0110] In some embodiments, the weight of the film layer is 25 g / m 2 , the machine speed of the thermal curing coater is 50m / min.

[0111] Example 5

[0112] The cotton packing film splicing tapes prepared in Examples 1 to 3 were tested for performance, including longitudinal tensile strength, transverse tensile strength, longitudinal elongation at break, transverse elongation at break, residual adhesion rate on the release surface, release surface peeling force, UV aging, tensile strength after aging (longitudinal), tensile strength after aging (transverse), elongation at break after aging (longitudinal), elongation at break after aging (transverse), and adhesive layer peeling force. The appearance of the cotton packing film splicing tapes was visually observed and tested using the national standard test method, and the test results are as follows:

[0113]

[0114]

[0115] It can be seen from the above table that in terms of longitudinal tensile strength, Example 1 does not meet the index requirements, while Examples 2 and 3 meet the index requirements. Moreover, by comparing Example 2 and Example 3, it can be seen that the longitudinal tensile strength of Example 3 is better than that of Example 2.

[0116] It can be seen from the above table that in terms of transverse tensile strength, Example 1 does not meet the index requirements, while Examples 2 and 3 meet the index requirements. Moreover, by comparing Example 2 and Example 3, it can be seen that the transverse tensile strength of Example 3 is better than that of Example 2.

[0117] It can be seen from the above table that in terms of longitudinal elongation at break, Examples 1 and 2 meet the index requirements, while Example 3 does not meet the index requirements. Moreover, by comparing Example 1 with Example 2, it can be seen that the longitudinal elongation at break of Example 1 is better than that of Example 2.

[0118] It can be seen from the above table that in terms of transverse elongation at break, Example 1 and Example 2 meet the index requirements, while Example 3 does not meet the index requirements. Moreover, by comparing Example 1 with Example 2, it can be seen that the transverse elongation at break of Example 1 is better than that of Example 2.

[0119] It can be seen from the above table that in terms of the residual adhesion rate of the release surface, Example 1 and Example 2 meet the index requirements, while Example 3 does not meet the index requirements. Moreover, by comparing Example 1 with Example 2, it can be seen that the residual adhesion rate of the release surface of Example 1 is better than that of Example 2.

[0120] It can be seen from the above table that in terms of release surface peeling force, Example 1 and Example 2 meet the index requirements, Example 3 does not meet the index requirements, and by comparing Example 1 and Example 2, it can be seen that the release surface peeling force of Example 1 is better than that of Example 2.

[0121] It can be seen from the above table that in terms of tensile strength after aging (longitudinal), Example 1 does not meet the index requirements, while Examples 2 and 3 meet the index requirements. Moreover, by comparing Example 2 and Example 3, it can be seen that the tensile strength after aging (longitudinal) of Example 3 is better than that of Example 2.

[0122] It can be seen from the above table that in terms of tensile strength after aging (transverse), Example 1 does not meet the index requirements, while Examples 2 and 3 meet the index requirements. Moreover, by comparing Example 2 and Example 3, it can be seen that the tensile strength after aging (transverse) of Example 3 is better than that of Example 2.

[0123] It can be seen from the above table that in terms of elongation at break (longitudinal direction) after aging, Example 1, Example 2, and Example 3 meet the index requirements, and by comparing Example 1, Example 2 and Example 3, it can be seen that the elongation at break (longitudinal direction) after aging of Example 1 is better than that of Example 2 and Example 3.

[0124] It can be seen from the above table that in terms of elongation at break after aging (transverse direction), Examples 1 and 2 meet the index requirements, while Example 3 does not meet the index requirements. Moreover, by comparing Example 1 with Example 2, it can be seen that the elongation at break after aging (transverse direction) of Example 1 is better than that of Example 2.

[0125] It can be seen from the above table that in terms of adhesive layer peeling force, Example 1 does not meet the index requirements, while Examples 2 and 3 meet the index requirements. Moreover, by comparing Example 2 with Example 3, it can be seen that the adhesive layer peeling force of Example 2 is better than that of Example 3.

[0126] In summary, the cotton packaging film splicing tape prepared in Example 2 meets all the test indicators.

[0127] Example 6

[0128] This embodiment relates to the application of a cotton packaging film splicing tape based on Embodiments 1 to 3 of the present invention in cotton packaging film.

[0129] like Figure 1 As shown, the non-self-adhesive film and the self-adhesive film are spliced ​​together by the cotton packing film splicing tape. Specifically, among the 24 packaging films of the cotton packing film, the 24 packaging films are connected end to end by the cotton packing film splicing tape.

[0130] in, Figure 1 Zone 1 is a non-self-adhesive film, zone 2 is a splicing tape, zone 3 is a self-adhesive film, and zone 4 is a sealing joint.

[0131] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0132] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A cotton packaging film splicing tape, characterized in that: include: The base film layer comprises an outer layer, a middle layer and an inner layer, and is prepared by a three-layer co-extrusion film blowing machine, and the raw material formula of the base film layer comprises metallocene low-density polyethylene, low-density polyethylene, an anti-aging agent, an anti-blocking agent, linear low-density polyethylene, and a yellow masterbatch; A silicone oil film layer, wherein the silicone oil film layer is formed on one side of the inner layer of the base film layer, and the raw material formula of the silicone oil film layer includes light-peeling silicone acrylate, tight-peeling silicone acrylate, and a photosensitizer; An adhesive film layer, wherein the adhesive film layer is formed on one side of the outer layer of the base film layer, and the raw material formula of the adhesive film layer includes 2-ethylhexyl acrylate, methyl acrylate, acrylic acid, an initiator, a cross-linking agent, and a tackifying resin rosin glycerol ester; Wherein, for the outer layer, the mass fraction of the metallocene low-density polyethylene is 60-80%, the mass fraction of the low-density polyethylene is 20-40%, the mass fraction of the anti-aging agent is 1-6%, and the mass fraction of the opening agent is 1-4%; Wherein, for the middle layer, the mass fraction of the metallocene low-density polyethylene is 60-80%, the mass fraction of the linear low-density polyethylene is 20-30%, the mass fraction of the yellow masterbatch is 4-8%, and the mass fraction of the opening agent is 1-4%; Wherein, for the inner layer, the mass fraction of the metallocene low-density polyethylene is 60-80%, the mass fraction of the low-density polyethylene is 20-40%, the mass fraction of the anti-aging agent is 1-6%, and the mass fraction of the opening agent is 1-4%; Wherein, for the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 60-75%, the mass fraction of the tight-peeling silicone acrylate is 20-35%, and the mass fraction of the photosensitizer is 1-2%; Among them, for the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 70-80%, the mass fraction of methyl acrylate is 10-20%, the mass fraction of acrylic acid is 2-5%, the mass fraction of the initiator is 0.1-0.5%, the mass fraction of the cross-linking agent is 0.5-2%, and the mass fraction of the tackifying resin rosin glycerol ester is 5-10%.

2. The cotton packaging film splicing tape according to claim 1, characterized in that: The anti-aging agent includes one or more of amine anti-aging agents, phenolic anti-aging agents, heterocyclic anti-aging agents, and phosphite anti-aging agents.

3. The cotton packaging film splicing tape according to claim 1, characterized in that: The opening agent includes one or more of erucic acid amide, ethylene bis stearamide, talcum powder, diatomaceous earth, and silicon dioxide.

4. The cotton packaging film splicing tape according to claim 1, characterized in that: The photosensitizer includes one or more of an organic photosensitizer, an inorganic photosensitizer, a polymer photosensitizer, a sol-gel photosensitizer, a biological photosensitizer and an organosilicon photosensitizer.

5. The cotton packaging film splicing tape according to claim 1, characterized in that: The initiator includes one or more of benzoyl peroxide, tert-butyl hydroperoxide and di-tert-butyl peroxide.

6. The cotton packaging film splicing tape according to claim 1, characterized in that: The crosslinking agent includes one or more of aziridine, polycarbodiimide crosslinking agent, epoxy resin crosslinking agent, metal ion crosslinking agent and melamine-formaldehyde crosslinking agent.

7. The cotton packaging film splicing tape according to any one of claims 1 to 6, characterized in that: The mass ratio of the outer layer, the middle layer and the inner layer is 30:40:

30.

8. A method for preparing a cotton packing film splicing tape, used for preparing the cotton packing film splicing tape as claimed in any one of claims 1 to 7, characterized in that: include: Weigh the raw materials of the outer layer, the middle layer, and the inner layer according to the mass ratio of the outer layer, the middle layer, and the inner layer, respectively, and mix them in a mixer for 5 minutes to 10 minutes to obtain a first mixed raw material, a second mixed raw material, and a third mixed raw material; The first mixed raw material, the second mixed raw material and the third mixed raw material are respectively loaded into the first hopper, the second hopper and the third hopper of the three-layer co-extrusion blow molding machine, and three-layer co-extrusion blow molding is performed to obtain a base film layer; A silicone oil film layer is applied on one side of the base film layer by using a UV light curing coater, and the silicone oil film layer is rolled up on the base film layer by irradiation with a mercury lamp protected by nitrogen; A heat curing coating machine is used to apply an adhesive film layer on the other side of the base film layer, and the splicing tape is rolled up; Wherein, for the outer layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%; Wherein, for the middle layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of linear low-density polyethylene is 20-30%, the mass fraction of yellow masterbatch is 4-8%, and the mass fraction of the opening agent is 1-4%; Wherein, for the inner layer, the mass fraction of metallocene low-density polyethylene is 60-80%, the mass fraction of low-density polyethylene is 20-40%, the mass fraction of anti-aging agent is 1-6%, and the mass fraction of opening agent is 1-4%; Wherein, for the silicone oil film layer, the mass fraction of the light-peeling silicone acrylate is 60-75%, the mass fraction of the tight-peeling silicone acrylate is 20-35%, and the mass fraction of the photosensitizer is 1-2%; Among them, for the adhesive film layer, the mass fraction of 2-ethylhexyl acrylate is 70-80%, the mass fraction of methyl acrylate is 10-20%, the mass fraction of acrylic acid is 2-5%, the mass fraction of initiator is 0.1-0.5%, the mass fraction of cross-linking agent is 0.5-2%, and the mass fraction of tackifying resin rosin glycerol ester is 5-10%.

9. The preparation method according to claim 8, characterized in that: The melt extrusion temperature of the outer layer, the middle layer and the inner layer is 160°C to 170°C, and the film blowing temperature is 150°C to 170°C; and / or The dry silicon content of the silicone oil film is 0.8-1.5 g / m 2 The oxygen content of the silicone oil film is less than 50 PPM, the machine speed of the UV light curing coater is 150-200 m / min, the UV wavelength of the mercury lamp is 200 nm-450 nm, and the intensity of the mercury lamp is 200-400 W / cm 2 ; and / or The weight of the adhesive film layer is 20 to 30 g / m 2 The machine speed of the thermal curing coating machine is 40-60 m / min.

10. Application of a cotton packaging film splicing tape according to any one of claims 1 to 7 in cotton packaging film, characterized in that: The non-self-adhesive film and the self-adhesive film are spliced ​​by cotton packing film splicing tape.

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