Silent box sealing BOPP adhesive tape and preparation method thereof

Abstract

The invention relates to the technical field of pressure-sensitive adhesives, in particular to a soundless box sealing BOPP adhesive tape and a preparation method thereof.The soundless box sealing BOPP adhesive tape comprises a base material layer, an acrylic acid pressure-sensitive adhesive layer and a silicone oil layer, and the upper surface and the lower surface of the base material layer are coated with the acrylic acid pressure-sensitive adhesive layer and the silicone oil layer respectively; the acrylic pressure-sensitive adhesive layer at least comprises the following raw materials in parts by weight: 40-52 parts of butyl acrylate, 4-12 parts of 2-ethylhexyl acrylate, 1-6 parts of acrylic acid, 1-5 parts of hydroxyethyl methylacrylate, 1-5 parts of a functional monomer, 40-62 parts of water and 0.4-2 parts of peroxide, corona treatment is performed on the BOPP base material, and then the silicone oil and the acrylic pressure-sensitive adhesive are respectively coated on two surfaces of the BOPP base material to prepare the adhesive tape. The high viscosity, easy unwinding and silent effects of the adhesive tape are effectively balanced, and the actual application requirements are better met.

Description

Technical Field

[0001] This invention relates to the field of pressure-sensitive adhesive technology, specifically to a silent BOPP sealing tape and its preparation method. Background Technology

[0002] Adhesive tape is increasingly widely used in people's daily lives and work, with its most common application being box sealing. Commercially available box sealing tapes typically use pressure-sensitive adhesive tapes with biaxially oriented polypropylene (BOPP) film as the base material. However, existing tapes often suffer from excessive unwinding force, leading to high labor intensity for users over extended periods. Furthermore, excessive unwinding force can cause tape deformation during the sealing process, especially during rapid automatic sealing, which produces a harsh, noisy sound. This not only negatively impacts the user's health but also contributes to noise pollution. Chinese patent application (publication number CN118755395A) discloses a noise-reducing BOPP sealing tape. It primarily improves the tape deformation and noise issues by applying a pressure-sensitive adhesive emulsion to the BOPP surface followed by corona treatment, forming micro-dimples and a stable adhesive layer. However, this method fails to effectively balance the tape's high adhesion, easy unwinding, and silent operation. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a silent BOPP sealing tape. The tape is prepared by coating both sides of a BOPP substrate with silicone oil and acrylic pressure-sensitive adhesive after corona treatment. This effectively balances the tape's high viscosity, easy unwinding, and silent operation, better meeting the needs of practical applications.

[0004] This invention provides a silent BOPP sealing tape, comprising a substrate layer, an acrylic pressure-sensitive adhesive layer, and a silicone oil layer, wherein the acrylic pressure-sensitive adhesive layer and the silicone oil layer are respectively coated on the upper and lower surfaces of the substrate layer; by weight, the acrylic pressure-sensitive adhesive layer comprises at least the following raw materials: 40-52 parts of butyl acrylate, 4-12 parts of isooctyl acrylate, 1-6 parts of acrylic acid, 1-5 parts of hydroxyethyl methacrylate, 1-5 parts of functional monomers, 40-62 parts of water, and 0.4-2 parts of peroxide.

[0005] In one embodiment, the substrate layer is a biaxially oriented polypropylene film.

[0006] In one embodiment, the acrylic pressure-sensitive adhesive layer comprises at least the following raw materials by weight: 42-50 parts butyl acrylate, 5-10 parts isooctyl acrylate, 2-5 parts acrylic acid, 2-4 parts hydroxyethyl methacrylate, 2-4 parts functional monomer, 50-60 parts water, and 0.5-0.9 parts peroxide.

[0007] In one embodiment, the raw materials for preparing the silicone oil layer, by weight, include at least 80-120 parts silicone oil, 1500-2000 parts organic solvent, 0.01-0.05 parts catalyst, and 0.01-0.1 parts curing agent.

[0008] In one embodiment, the functional monomer is selected from at least one of β-carboxyethyl acrylate, glycidyl methacrylate, isobornyl methacrylate, isobornyl acrylate, or trimethylolpropane trimethacrylate.

[0009] In one embodiment, the solvent is deionized water.

[0010] In one embodiment, the peroxide comprises at least persulfate.

[0011] In one embodiment, the persulfate is selected from at least one of sodium persulfate or ammonium persulfate.

[0012] This invention optimizes the acrylic monomers in the system, including 40-52 parts of butyl acrylate, 4-12 parts of isooctyl acrylate, 1-6 parts of acrylic acid, and 1-5 parts of hydroxyethyl methacrylate, so that the provided acrylic pressure-sensitive adhesive has high initial tack, high holding power, moderate unwinding, and silent and non-slip properties.

[0013] Furthermore, by introducing β-carboxyethyl acrylate and combining it with the acrylic monomers in the system, the provided tape exhibits high bonding strength and good sealing performance. In particular, controlling the amount of β-carboxyethyl acrylate and persulfate introduced into the system ensures that the provided tape has excellent bonding performance while avoiding excessively hard adhesive layers and excessive unwinding forces that could lead to noise.

[0014] In one embodiment, the curing agent is selected from at least one of methyl hydrogen silicone oil, amino silicone oil, and methyltrimethoxysilane.

[0015] In one embodiment, the catalyst is selected from platinum-based catalysts.

[0016] In one embodiment, the platinum catalyst is selected from at least one of chloroplatinic acid and its derivatives, platinum-olefin complexes, or platinum-alkynyl complexes.

[0017] In one embodiment, the platinum catalyst is a Karstedt catalyst (CAS No. 81032-58-8).

[0018] In one embodiment, the silicone oil is a solvent-free silicone oil, and the type of the solvent-free silicone oil is selected from at least one of 8650#, 8630#, 8616# or 8619#.

[0019] In one embodiment, the solvent-free silicone oil is designated as 8630# and is sourced from Guangdong Yongzhuo Technology Co., Ltd.

[0020] In one embodiment, the organic solvent is selected from at least one of aliphatic hydrocarbons, esters, alcohols, aromatic hydrocarbons, or solvent oils.

[0021] In one embodiment, the organic solvent is selected from at least one of n-heptane, n-hexane, ethyl acetate, isopropanol toluene, xylene, and No. 120 gasoline.

[0022] The silent BOPP sealing tape provided by this invention has a silicone oil layer on one side. The silicone oil layer has an unwinding force of 1-5N / 48mm, which is not too slippery and will not slip off automatically during use. It is easy to use, and the surface is non-slip. When the boxes are sealed, they will not slip or collapse when stacked, thus better meeting the needs of practical applications.

[0023] Another aspect of the present invention provides a method for preparing silent BOPP sealing tape, comprising at least the following steps: adding the raw materials of the acrylic pressure-sensitive adhesive layer into a container to prepare acrylic pressure-sensitive adhesive; mixing the raw materials of the silicone oil layer to prepare silicone oil; subjecting the substrate to corona treatment, coating the upper and lower surfaces with acrylic pressure-sensitive adhesive and silicone oil respectively, and curing to form acrylic pressure-sensitive adhesive layer and silicone oil layer on the upper and lower surfaces respectively.

[0024] In one embodiment, the thickness of the acrylic pressure-sensitive adhesive layer is 20-30 μm.

[0025] In one embodiment, the dry silicone oil basis weight of the silicone oil layer is 0.02-0.1 g / m³. 2 .

[0026] Beneficial effects

[0027] 1. This invention provides a silent BOPP sealing tape. The tape is prepared by coating both sides of the BOPP substrate with silicone oil and acrylic pressure-sensitive adhesive after corona treatment. This effectively balances the tape's high adhesion, easy unwinding, and silent effect, better meeting the needs of practical applications.

[0028] 2. This invention optimizes the acrylic monomers in the system, including 40-52 parts of butyl acrylate, 4-12 parts of isooctyl acrylate, 1-6 parts of acrylic acid, and 1-5 parts of hydroxyethyl methacrylate, so that the provided acrylic pressure-sensitive adhesive has high initial tack, high holding power, moderate unwinding, and silent and non-slip properties.

[0029] 3. By introducing β-carboxyethyl acrylate and combining it with acrylic monomers in the system, this invention enables the provided tape to have high bonding strength and good sealing performance.

[0030] 4. By controlling the amount of β-carboxyethyl acrylate and persulfate introduced into the system, this invention provides a tape with excellent bonding performance while avoiding excessively hard adhesive layer and excessive unwinding force that could lead to noise.

[0031] 5. The silent BOPP sealing tape provided by the present invention has a silicone oil layer on one side. The unwinding force of the silicone oil layer is 1-5N / 48mm, which is not too slippery and will not slip off automatically during use. It is easy to use, the surface is non-slip, and the sealed boxes will not slip or collapse when stacked, thus better meeting the needs of practical applications. Detailed Implementation

[0032] Examples 1-3, Comparative Examples 1-3

[0033] Examples 1-3 and Comparative Examples 1-3 of the present invention provide a silent BOPP sealing tape, comprising a substrate layer, an acrylic pressure-sensitive adhesive layer, and a silicone oil layer, wherein the acrylic pressure-sensitive adhesive layer and the silicone oil layer are respectively coated on the upper and lower surfaces of the substrate layer; the substrate layer is a biaxially oriented polypropylene film; the formulations of the acrylic pressure-sensitive adhesive layer and the silicone oil layer by weight are shown in Table 1.

[0034] Table 1

[0035]

[0036] In Table 1: the platinum-based catalyst is a Karstedt catalyst (CAS No. 81032-58-8), and the solvent-free silicone oil is model 8630#, sourced from Guangdong Yongzhuo Technology Co., Ltd. The methyl hydrogen-containing silicone oil is model RH202-20, sourced from Runhe Materials.

[0037] Examples 1-3 and Comparative Examples 1-3 of the present invention, in another aspect, provide a method for preparing silent BOPP sealing tape, comprising the following steps: adding the raw materials of the acrylic pressure-sensitive adhesive layer to a container to prepare acrylic pressure-sensitive adhesive; adding the raw materials of the silicone oil layer to a container to prepare silicone; subjecting the substrate to corona treatment, coating the upper and lower surfaces with acrylic pressure-sensitive adhesive and silicone respectively, and curing to form an acrylic pressure-sensitive adhesive layer and a silicone oil layer on the upper and lower surfaces of the substrate respectively. The thickness of the acrylic pressure-sensitive adhesive layer is 25 μm, and the dry silicone oil basis weight of the silicone oil layer is 0.05 g / m³. 2 .

[0038] Performance testing

[0039] 1. Peel strength: Referring to GB / T 2792-2014, the 180° peel strength of the tapes provided in the examples and comparative examples with stainless steel plates was tested, and the results are shown in Table 2.

[0040] 2. Initial tack: The initial tack of the tapes provided in the examples and comparative examples was tested according to GB / T 4852-2002-Method A. The results are shown in Table 2.

[0041] 3. Holding power: The holding power of the tapes provided in the examples and comparative examples was tested according to GB / T 4851-2014-Method A. The results are shown in Table 2.

[0042] 4. Tensile strength: Refer to GB / T 1040.3-2006, dumbbell-shaped specimen: Take the cured adhesive film and stretch it at a speed of 500 mm / min until it breaks. The tensile strength results of the tapes provided in the examples and comparative examples are shown in Table 2.

[0043] 5. Unwinding force: Referring to the national standard GB / T 4850-2002 "Determination of low-speed unwinding strength of pressure-sensitive adhesive tape", the sample was unwound at a rate of (300±30) mm / min using a universal testing machine and the maximum load was recorded. The unwinding force of the tapes provided in the test examples and comparative examples is shown in Table 2.

[0044] Table 2

[0045] Test Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Peel strength, N 7.2 7.6 6.9 5.2 4.8 5.5 Adhesion, h ≥24h ≥24h ≥24h 10 13 ≥24 Initial tack, ball size 22# ball 24 26 22 26 20 Tensile strength, N / cm 46 51 38 45 32 39 Unwinding force, N / 48mm 4.2 3.9 2.8 1.5 0.8 6.5 Unrolling effect Silent and smooth Silent and smooth Silent and smooth Silent is too slippery Silent is too slippery There is sound

[0046] Analysis of the data in Table 2 of the examples and comparative examples shows that the products provided by Examples 1-3, compared with those of Comparative Examples 1-3, have excellent peel strength, initial tack, holding power, and tensile strength, and the unwinding force is moderate (2–5 N / 48 mm) with no noise.

Claims

1. A silent BOPP sealing tape, characterized in that, It includes a substrate layer, an acrylic pressure-sensitive adhesive layer, and a silicone oil layer, with the acrylic pressure-sensitive adhesive layer and the silicone oil layer respectively coated on the upper and lower surfaces of the substrate layer; by weight, the acrylic pressure-sensitive adhesive layer includes at least the following raw materials: 40-52 parts of butyl acrylate, 4-12 parts of isooctyl acrylate, 1-6 parts of acrylic acid, 1-5 parts of hydroxyethyl methacrylate, 1-5 parts of functional monomer, 40-62 parts of water, and 0.4-2 parts of peroxide.

2. The silent BOPP sealing tape according to claim 1, characterized in that, The raw materials for preparing the silicone oil layer, by weight, include at least 80-120 parts silicone oil, 1500-2000 parts organic solvent, 0.01-0.05 parts catalyst, and 0.01-0.1 parts curing agent.

3. The silent BOPP sealing tape according to claim 1, characterized in that, The functional monomer is selected from at least one of β-carboxyethyl acrylate, glycidyl methacrylate, isobornyl methacrylate, isobornyl acrylate, or trimethylolpropane trimethacrylate.

4. The silent BOPP sealing tape according to claim 1, characterized in that, The peroxides include at least persulfates.

5. The silent BOPP sealing tape according to claim 4, characterized in that, The persulfate is selected from at least one of sodium persulfate or ammonium persulfate.

6. The silent BOPP sealing tape according to claim 2, characterized in that, The catalyst is selected from platinum-based catalysts.

7. The silent BOPP sealing tape according to claim 6, characterized in that, The platinum-based catalyst is selected from at least one of chloroplatinic acid and its derivatives, platinum-olefin complexes, or platinum-alkynyl complexes.

8. The silent BOPP sealing tape according to claim 2, characterized in that, The silicone oil is a solvent-free silicone oil.

9. The silent BOPP sealing tape according to claim 2, characterized in that, The organic solvent is selected from at least one of aliphatic hydrocarbons, esters, alcohols, aromatic hydrocarbons, or solvent oils.

10. A method for preparing silent BOPP sealing tape according to any one of claims 1-9, characterized in that, The process includes at least the following steps: adding the raw materials of the acrylic pressure-sensitive adhesive layer into a container to prepare the acrylic pressure-sensitive adhesive; mixing the raw materials of the silicone oil layer to prepare the silicone oil; subjecting the substrate to corona treatment, coating the upper and lower surfaces with the acrylic pressure-sensitive adhesive and the silicone oil respectively, and curing to form the acrylic pressure-sensitive adhesive layer and the silicone oil layer on the upper and lower surfaces of the substrate respectively.

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