Anti-static packing belt and preparation method thereof

Abstract

The invention relates to the technical field of compositions of high-molecular compounds, in particular to an anti-static packing belt and a preparation method thereof. The packaging belt comprises the following components in parts by weight: 60-80 parts of polypropylene, 5-10 parts of a flexibilizer, 0.5-2 parts of a lubricant, 1-5 parts of an antioxidant and 2-5 parts of a polymer type antistatic agent. The invention also provides a preparation method of the composition. Compared with the prior art, the prepared packing belt is lasting in antistatic effect, good in antistatic effect, good in mechanical property and not prone to damage during use.

Description

Technical Field

[0001] The invention relates to the technical field of polymer compound compositions, and in particular to an antistatic packing tape and a preparation method thereof. Background Art

[0002] Polypropylene strapping tape (PP strapping tape) is a plastic strapping material made of polypropylene drawing grade resin. It has many excellent properties, including good plasticity, strong breaking force, bending fatigue resistance, low density and excellent tensile impact performance, which makes it widely used in various fields. PP strapping tape is light in material, easy to carry and operate, and has good flexibility, which can easily wrap around items of different shapes. In addition, PP strapping tape has high tensile strength, which can ensure the firmness of the items, and it is also corrosion-resistant and suitable for use in a variety of environmental conditions. It is also very easy to operate and suitable for various strapping machines, including fully automatic, semi-automatic and manual strapping machines. PP strapping tape is also an environmentally friendly material that can be recycled and is environmentally friendly. The classification of PP strapping tape is very diverse, and it can be classified according to different standards such as production process, raw material source, usage scenario, printing, color, etc. The process of producing PP strapping tape includes steps such as melting, pressing, molding, cooling, winding, packaging and warehousing of plastic pellets. In the production process, controlling temperature and stretch ratio are key factors to ensure the quality of strapping tape. PP strapping tape is an ideal choice for the packaging industry because of its light weight, economy, ease of use and good strapping performance. However, polypropylene is a highly insulating material with a very high surface resistivity, so it is easy to generate and accumulate static electricity during production and use. The accumulation of static electricity may cause a variety of hazards, such as dust absorption, discharge, breakdown, and even safety accidents such as combustion or explosion. Especially in a dry environment, the problem of static electricity is more serious, which may damage the product or affect the production process.

[0003] In order to reduce the risks and losses caused by static electricity, polypropylene strapping tape needs to be treated with antistatic treatment. Antistatic treatment usually involves adding specific antistatic agents or conductive fillers to PP materials. These additives can improve the conductivity of the material and thus reduce the accumulation of static electricity. The action process of antistatic agents includes uniform distribution during extrusion, migration to the surface, forming a conductive layer, and absorbing moisture in the air to eliminate static electricity. As the ambient humidity increases, the antistatic performance of PP materials will be significantly improved.

[0004] CN108359207A provides a high-strength antistatic polypropylene plastic strapping tape and a preparation method thereof, wherein the plastic strapping tape comprises the following components in parts by weight: 80 parts of polypropylene, 5-15 parts of a toughening agent, 5-15 parts of a filler, 0.1-0.3 parts of a coupling agent and 1.7-4.1 parts of a composite antistatic agent; the preparation method comprises the following steps: (1) stirring and drying the polypropylene to obtain dried polypropylene; (2) mixing the toughening agent, the filler, the coupling agent and the composite antistatic agent to obtain a mixture; (3) processing the dried polypropylene and the mixture in a single screw extruder to obtain the above-mentioned plastic strapping tape. The composite antistatic agent is added to the raw materials of the invention, so that the plastic strapping tape prepared by the invention has the characteristics of excellent antistatic performance, high tensile strength and impact resistance, and can be used for preparation by extrusion and stretching process.

[0005] CN106633362A provides an antistatic, extrusion-resistant and anti-fracture strapping tape, which belongs to the technical field of packaging materials. It is prepared by the following components in parts by weight: 100 parts of polypropylene drawing resin, 12-18 parts of polyethylene octene copolymer elastomer, 10-20 parts of modified asphalt, 5-15 parts of antistatic agent, 5-8 parts of aromatic oil, 0.5-1.5 parts of dispersant, 4-6 parts of polyacetylene, 8-12 parts of carbon fiber, 1-5 parts of silane coupling agent, 0.8-1.4 parts of C5 resin, and 1-5 parts of antioxidant. The strapping tape prepared by the present invention has simple structure, energy saving and environmental protection, low cost, high strength, high fracture resistance, good antistatic effect, no harmful substances in the production process, no adhesion of the strapping tape, high softness, strength and toughness, and has a broad market space.

[0006] Although small antistatic agents and metal salt additives can exert antistatic effects by migrating to the surface of polypropylene materials and absorbing moisture, these antistatic agents are easily affected by environmental conditions, causing them to gradually fall off, thereby weakening or losing their antistatic function. On the other hand, although black conductive inorganic materials can provide long-lasting antistatic properties, they require a larger proportion of addition, which may adversely affect the mechanical properties and color selection of the material. Therefore, there is still an urgent need to develop a polypropylene material that is easy to produce and can provide long-term and stable antistatic properties in the market to meet the production and application needs of polypropylene strapping tapes. Summary of the invention

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an antistatic packing tape and a preparation method thereof.

[0008] Polymer antistatic agents can form conductive paths in polymer matrices to achieve antistatic effects. Compared with small molecule antistatic agents, they are not affected by environmental humidity and will not affect product color. Polymer antistatic agents overcome the shortcomings of traditional antistatic agents. Instead of relying on antistatic agents to migrate to the surface to absorb moisture, they form a conductive network structure inside the matrix, which is used as a path to leak charges and reduce resistance. Compared with traditional antistatic agents, their antistatic effects are more durable, not affected by air humidity, and less susceptible to factors such as wiping and washing. The present invention provides a hydrophilic polymer as an antistatic agent, and allylbenzene, N, N, N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and hydroxymethyl methacrylate are polymerized by free radicals to obtain a hydrophilic polymer antistatic agent, which is mixed with a polypropylene resin to form a network structure in the matrix, and the accumulated charges can be released through the conductive path, effectively reducing the volume resistance of the blend. This polymer type antistatic agent does not completely rely on surface water absorption, so it is less affected by humidity, and because the polymer has a larger relative molecular mass, it cannot easily migrate to the substrate surface, and is not affected by washing and wiping, and the effect is maintained longer. Wherein, N, N, N-trimethyl-2-[(2-methacryloyl) oxygen base] third-2-ammonium chloride is due to good hydrophilicity, so it can better absorb moisture in the air, and therefore has a direct antistatic effect, and allyl benzene and polypropylene can have better compatibility, and hydroxymethyl methacrylate is conducive to promoting the moisture absorption and cationic dissociation of quaternary ammonium salt, so the resulting antistatic agent not only has a good effect of reducing surface resistance, and the performance of the matrix resin itself is less affected. The antistatic effect of the strapping tape prepared by the present invention is lasting, and the antistatic effect is good, the mechanical property is good, and it is not easy to be damaged during use.

[0009] To achieve the above object, the present invention provides an antistatic packing tape, comprising the following components in parts by weight: 60 to 80 parts of polypropylene, 5 to 10 parts of a toughening agent, 0.5 to 2 parts of a lubricant, 1 to 5 parts of an antioxidant and 2 to 5 parts of a polymer antistatic agent.

[0010] Furthermore, the toughening agent is polyethylene octene copolymer elastomer.

[0011] Furthermore, the lubricant is magnesium stearate.

[0012] Furthermore, the antioxidant is antioxidant 1010.

[0013] The preparation method of the polymer antistatic agent comprises the following steps:

[0014] Allylbenzene, N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and hydroxymethyl methacrylate are added to anhydrous ethanol, stirred and mixed evenly, then an initiator is added, the temperature is raised, and the reaction is carried out for 4 to 8 hours, and then the volume is evaporated to 1 / 4 of the original volume, and then toluene is added until a precipitate appears, and the residue is filtered and dried to obtain a polymer antistatic agent.

[0015] Furthermore, the molar ratio of allylbenzene, N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and hydroxymethyl methacrylate is 10:5 to 10:1 to 5.

[0016] Furthermore, the initiator is azobisisobutyronitrile.

[0017] Furthermore, the amount of the initiator is 0.5-1 wt%.

[0018] Furthermore, the temperature range of the heating is 70-80°C.

[0019] A method for preparing an antistatic packing tape comprises the following steps:

[0020] S1. Mix polypropylene, toughening agent, lubricant, antioxidant and polymer antistatic agent and stir to obtain a mixture;

[0021] S2. After the mixed material is kneaded and plasticized, it is extruded, cooled and shaped, rolled and packaged to obtain the antistatic strapping tape.

[0022] Beneficial effects of the present invention:

[0023] 1. Compared with the prior art, the present invention provides a hydrophilic polymer as an antistatic agent. Allylbenzene, N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and hydroxymethyl methacrylate are polymerized by free radicals to obtain a hydrophilic polymer antistatic agent. After being mixed with polypropylene resin, a network structure is formed in the matrix. The accumulated charge can be released through the conductive path, effectively reducing the volume resistance of the blend. The polymer antistatic agent does not completely rely on surface water absorption, so it is less affected by humidity. Moreover, since the polymer has a large relative molecular mass, it cannot easily migrate to the surface of the matrix and is not affected by washing and wiping, so the effect is maintained for a longer time.

[0024] 2. The strapping tape prepared by the present invention has a long-lasting antistatic effect, good antistatic effect, good mechanical properties, and is not easily damaged during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The following are photos of samples of the produced strapping tapes. DETAILED DESCRIPTION

[0026] The present invention provides an antistatic strapping tape, comprising the following components: polypropylene, a toughening agent, a lubricant, an antioxidant and a polymer antistatic agent. The polypropylene, the toughening agent, the lubricant, the antioxidant and the polymer antistatic agent are mixed to obtain a mixture, and then the mixture is mixed and plasticized, extruded, cooled and shaped, rolled and packaged to obtain the strapping tape.

[0027] Polypropylene as the base material has good mechanical properties and chemical stability and is the main component of strapping tape. It provides the basic physical properties of strapping tape, such as strength and durability.

[0028] Tougheners are used to improve the impact resistance and toughness of polypropylene. They prevent brittle fracture of the material by absorbing and dissipating energy when the material is impacted.

[0029] The role of the lubricant is to reduce the friction between polypropylene and the processing equipment during processing, improve processing efficiency, and reduce friction during the use of strapping tape to facilitate packaging and unpacking.

[0030] Antioxidants are used to extend the service life of polypropylene and prevent it from degradation due to oxidation during processing and use. It protects polypropylene from aging caused by heat and light by capturing free radicals and inhibiting the oxidation chain reaction.

[0031] As a key component of antistatic strapping tape, polymer antistatic agent is prepared by free radical polymerization of allylbenzene, N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and hydroxymethyl methacrylate. After being mixed with polypropylene resin, a network structure is formed in the matrix. The accumulated charges can be released through the conductive path, effectively reducing the volume resistance of the blend to ensure that the strapping tape has stable antistatic properties.

[0032] N,N,N-trimethyl-2-[(2-methylacryloyl)oxy]propan-2-aminium chloride, CAS No.: 93842-91-2.

[0033] Hydroxymethyl Methacrylate, CAS No.: 21982-30-9.

[0034] Polypropylene, model: Formosa Plastics 1020, Taiwan, China, Dongguan Gansheng Plastic Technology.

[0035] Polyethylene octene copolymer elastomer, brand: DE2300, Foshan Ruisheng Plastic.

[0036] Example 1

[0037] A method for preparing an antistatic packing tape comprises the following steps, measured in parts by weight:

[0038] S1, mixing 80 parts of polypropylene, 10 parts of polyethylene octene copolymer elastomer, 2 parts of magnesium stearate, 1 part of antioxidant 1010, and 4 parts of polymer antistatic agent, and stirring to obtain a mixture;

[0039] S2. After the mixed material is kneaded and plasticized, it is extruded, cooled and shaped, rolled and packaged to obtain the antistatic strapping tape.

[0040] The preparation method of the polymer antistatic agent comprises the following steps:

[0041] Add 11.8 parts of allylbenzene, 19.89 parts of N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and 1.16 parts of hydroxymethyl methacrylate to 150 parts of anhydrous ethanol, stir and mix evenly, then add 0.2 parts of azobisisobutyronitrile, heat to 75°C, react for 6 hours, and then concentrate under reduced pressure to evaporate the volume to 1 / 4 of the original volume, then add 4 times the volume of toluene until a precipitate appears, filter, and dry the residue to obtain a polymer antistatic agent.

[0042] Example 2

[0043] A method for preparing an antistatic packing tape comprises the following steps, measured in parts by weight:

[0044] S1, mixing 80 parts of polypropylene, 10 parts of polyethylene octene copolymer elastomer, 2 parts of magnesium stearate, 1 part of antioxidant 1010, and 2 parts of polymer antistatic agent, and stirring to obtain a mixture;

[0045] S2. After the mixed material is kneaded and plasticized, it is extruded, cooled and shaped, rolled and packaged to obtain the antistatic strapping tape.

[0046] The preparation method of the polymer antistatic agent comprises the following steps:

[0047] Add 11.8 parts of allylbenzene, 19.89 parts of N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and 1.16 parts of hydroxymethyl methacrylate to 150 parts of anhydrous ethanol, stir and mix evenly, then add 0.2 parts of azobisisobutyronitrile, heat to 75°C, react for 6 hours, and then concentrate under reduced pressure to evaporate the volume to 1 / 4 of the original volume, then add 4 times the volume of toluene until a precipitate appears, filter, and dry the residue to obtain a polymer antistatic agent.

[0048] Example 3

[0049] A method for preparing an antistatic packing tape comprises the following steps, measured in parts by weight:

[0050] S1, mixing 80 parts of polypropylene, 10 parts of polyethylene octene copolymer elastomer, 2 parts of magnesium stearate, 1 part of antioxidant 1010, and 3 parts of polymer antistatic agent, and stirring to obtain a mixture;

[0051] S2. After the mixed material is kneaded and plasticized, it is extruded, cooled and shaped, rolled and packaged to obtain the antistatic strapping tape.

[0052] The preparation method of the polymer antistatic agent comprises the following steps:

[0053] Add 11.8 parts of allylbenzene, 19.89 parts of N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and 1.16 parts of hydroxymethyl methacrylate to 150 parts of anhydrous ethanol, stir and mix evenly, then add 0.2 parts of azobisisobutyronitrile, heat to 75°C, react for 6 hours, and then concentrate under reduced pressure to evaporate the volume to 1 / 4 of the original volume, then add 4 times the volume of toluene until a precipitate appears, filter, and dry the residue to obtain a polymer antistatic agent.

[0054] Example 4

[0055] A method for preparing an antistatic packing tape comprises the following steps, measured in parts by weight:

[0056] S1, mixing 80 parts of polypropylene, 10 parts of polyethylene octene copolymer elastomer, 2 parts of magnesium stearate, 1 part of antioxidant 1010, and 5 parts of polymer antistatic agent, and stirring to obtain a mixture;

[0057] S2. After the mixed material is kneaded and plasticized, it is extruded, cooled and shaped, rolled and packaged to obtain the antistatic strapping tape.

[0058] The preparation method of the polymer antistatic agent comprises the following steps:

[0059] Add 11.8 parts of allylbenzene, 19.89 parts of N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and 1.16 parts of hydroxymethyl methacrylate to 150 parts of anhydrous ethanol, stir and mix evenly, then add 0.2 parts of azobisisobutyronitrile, heat to 75°C, react for 6 hours, and then concentrate under reduced pressure to evaporate the volume to 1 / 4 of the original volume, then add 4 times the volume of toluene until a precipitate appears, filter, and dry the residue to obtain a polymer antistatic agent.

[0060] Comparative Example 1

[0061] A method for preparing an antistatic packing tape comprises the following steps, measured in parts by weight:

[0062] S1, mixing 80 parts of polypropylene, 10 parts of polyethylene octene copolymer elastomer, 2 parts of magnesium stearate, 1 part of antioxidant 1010, and 4 parts of ethoxylated octadecylamine, and stirring to obtain a mixture;

[0063] S2. After the mixed material is kneaded and plasticized, it is extruded, cooled and shaped, rolled and packaged to obtain the antistatic strapping tape.

[0064] Test Example 1

[0065] The resistivity of the surface of the strapping tape samples in the control example and the embodiment after cooling and forming for 2 hours was tested by a resistance meter, and then the samples were placed at a relative air humidity of 80% for 1, 2, and 4 weeks and the surface resistivity of the strapping tape samples was tested again. After 4 weeks, the samples were washed with water and the surface resistivity of the strapping tape samples was tested again. The specific results are shown in Table 1.

[0066] Table 1 Surface resistivity of antistatic strapping tape at different times

[0067]

[0068]

[0069] As can be seen from Table 1, the strapping tape in the embodiment is compared with the reference example, and the change in surface resistivity reaches stability after 4 weeks, while the strapping tape in the reference example has remained basically unchanged after 2 weeks. This is because the relative molecular mass of the traditional antistatic agent is low, and it is not completely compatible with the plastic matrix when added to polypropylene. During use, the antistatic agent constantly migrates from the inside, absorbs moisture in the air through the end hydrophilic group, dredges the electrostatic charge, and reduces the surface resistance of the plastic matrix. This precipitation speed is fast, so the surface resistance in Reference Example 1 is stable and fast. The polymer antistatic agent in the embodiment has a larger molecular weight and better compatibility with the matrix, so it is more difficult to precipitate, and the surface resistivity does not increase after washing, while the surface resistivity of the sample in Reference Example 1 is significantly increased after washing, which may be caused by the loss of the antistatic agent precipitated on the surface. Compared with Examples 2 to 4, the addition amount of the polymer antistatic agent in Example 1 is different. Since the molecular weight of the polymer antistatic agent is larger and a network structure is formed in the matrix during the compatibility process with the matrix, the accumulated charge is released through the conductive path, which effectively reduces the volume resistance of the blend. When the addition amount increases, it is beneficial for the polymer to form a continuous network throughout. However, when the addition amount is too large, it forms aggregation inside the polypropylene, which makes it difficult to migrate to the sample surface. Therefore, the decrease in surface resistivity gradually tends to be stable, and this aggregation may further affect the mechanical properties of the sample.

[0070] Test Example 2

[0071] The performance tests of the samples in the embodiments and control examples were carried out with reference to the test methods in QB / T3811-1999 "Plastic Strapping", and the specific results are shown in Table 2.

[0072] Table 2 Performance test results of anti-static strapping tape

[0073]

[0074] It can be seen from Table 2 that the antistatic strapping tape prepared by the present invention has good mechanical properties and is not prone to cracking or collapse during use. However, due to the different amounts of polymer antistatic agents added in the embodiments, the mechanical properties of the samples are slightly different. Overall, the amount added in Example 1 is relatively optimal.

[0075] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An antistatic packing tape, characterized in that: The invention comprises the following components in parts by weight: 60 to 80 parts of polypropylene, 5 to 10 parts of toughening agent, 0.5 to 2 parts of lubricant, 1 to 5 parts of antioxidant and 2 to 5 parts of polymer antistatic agent.

2. The antistatic packing tape according to claim 1, characterized in that: The preparation method of the polymer antistatic agent comprises the following steps: Allylbenzene, N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and hydroxymethyl methacrylate are added to anhydrous ethanol, stirred and mixed evenly, then an initiator is added, the temperature is raised, and the reaction is carried out for 4 to 8 hours, and then the volume is evaporated to 1 / 4 of the original volume, and then toluene is added until a precipitate appears, and the residue is filtered and dried to obtain a polymer antistatic agent.

3. The antistatic packing tape according to claim 1, characterized in that: The lubricant is magnesium stearate.

4. The antistatic packing tape according to claim 1, characterized in that: The antioxidant is antioxidant 1010.

5. The antistatic packing tape according to claim 1, characterized in that: The toughening agent is polyethylene octene copolymer elastomer.

6. The antistatic packing tape according to claim 5, characterized in that: The molar ratio of allylbenzene, N,N,N-trimethyl-2-[(2-methacryloyl)oxy]propane-2-ammonium chloride and hydroxymethyl methacrylate is 10:5 to 10:1 to 5.

7. The antistatic packing tape according to claim 5, characterized in that: The initiator is azobisisobutyronitrile.

8. The antistatic packing tape according to claim 5, characterized in that: The amount of the initiator used is 0.5-1 wt%.

9. The antistatic packing tape according to claim 5, characterized in that: The temperature range of the heating is 70-80°C.

10. A method for preparing the antistatic strapping tape according to any one of claims 1 to 9, characterized in that: The steps include: S1. Mix polypropylene, toughening agent, lubricant, antioxidant and polymer antistatic agent and stir to obtain a mixture; S2. After the mixed material is kneaded and plasticized, it is extruded, cooled and shaped, rolled and packaged to obtain the antistatic strapping tape.

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