Antistatic masterbatch for low humidity environments and method for its preparation

Abstract

This invention discloses an antistatic masterbatch for low-humidity environments and its preparation method, belonging to the field of polymer materials technology. The antistatic masterbatch for low-humidity environments described in this invention comprises: polyether block amide elastomer (PEBA), stabilizer, conductive filler, and glycerol; wherein the mass ratio of polyether block amide elastomer, stabilizer, conductive filler, and glycerol is 40-90:1-3:4-15:3-6; the stabilizer is a mixture of calcium stearate and zinc stearate; and the conductive filler is a mixture of zinc oxide and titanium dioxide. The antistatic masterbatch prepared by this invention maintains essentially unchanged antistatic properties at temperatures ranging from -40℃ to 80℃, and exhibits excellent anti-aging and anti-sun exposure capabilities, showing broad market application prospects.

Description

Technical Field

[0001] This invention relates to an antistatic masterbatch for low-humidity environments and its preparation method, belonging to the field of polymer materials technology. Background Technology

[0002] Plastic products typically have advantages such as high cost-effectiveness, good mechanical properties, high thermal stability, excellent processing performance and electrical insulation properties, and are widely used in various fields such as food packaging, household appliances, electronic components, and new energy. However, static electricity often accumulates on the surface of plastic products due to friction, extrusion and other reasons, which can cause dust attraction, electric shock, or even explosions after sparks are generated.

[0003] To avoid the aforementioned problems and improve the safety of plastic products, antistatic treatment is essential. Currently, most plastics use traditional antistatic agents, which rely on chemical methods to achieve their antistatic effect. However, these antistatic agents often face problems such as migration and atomization during use, leading to limitations and challenges in their application. More importantly, the antistatic performance of these chemical antistatic agents is frequently affected by ambient humidity; changes in humidity directly impact their effectiveness. Therefore, in environments with significant humidity fluctuations, their long-term antistatic effect is not ideal.

[0004] Currently, some antistatic masterbatches have emerged, which are prepared by mixing and pelletizing conductive agents with resin carriers and other additives. Conductive agents include conductive polymers, surfactants, or ionic compounds. However, antistatic masterbatches prepared by these methods have difficulty maintaining their antistatic properties in low-humidity environments, limiting their application range. Furthermore, the addition of antistatic agents during masterbatch preparation may lead to uneven polymer dispersion and increased processing difficulty, resulting in a failure to achieve satisfactory antistatic effects.

[0005] Block polyether amide elastomers have unique structures and properties, bringing new inspiration to the field of antistatics; they are compatible with a variety of engineering polymers such as PET, PA, and PP, and have great application prospects in the masterbatch field; however, one problem is that their antistatic properties may fluctuate under different temperature and humidity conditions, which may affect the performance stability and use effect of the product, thus limiting its application range.

[0006] Therefore, how to prepare an antistatic masterbatch for low-humidity environments is an urgent problem to be solved. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides an antistatic masterbatch for low-humidity environments and its preparation method. The antistatic masterbatch prepared by this invention maintains essentially unchanged antistatic properties at temperatures ranging from -40℃ to 80℃, and exhibits excellent anti-aging and anti-sun exposure capabilities, thus possessing broad market application prospects.

[0008] The first objective of this invention is to provide an antistatic masterbatch for low-humidity environments, the components of which are: polyether block amide elastomer (PEBA), stabilizer, conductive filler, and glycerin;

[0009] The mass ratio of polyether block amide elastomer, stabilizer, conductive filler and glycerin is 40-90:1-3:4-15:3-6.

[0010] The stabilizer is a mixture of calcium stearate and zinc stearate;

[0011] The conductive filler is a mixture of zinc oxide and titanium dioxide.

[0012] In one embodiment of the present invention, the polyether block amide elastomer (PEBA) is Pebax (nylon elastomer) MH1657.

[0013] In one embodiment of the present invention, the mass ratio of calcium stearate to zinc stearate in the stabilizer is 2:1.

[0014] In one embodiment of the present invention, the mass ratio of zinc oxide to titanium dioxide in the conductive filler is 1:1.

[0015] In one embodiment of the present invention, the particle size of the antistatic masterbatch is 1.2-2 mm.

[0016] A second objective of this invention is to provide a method for preparing antistatic masterbatch for low-humidity environments, comprising the following steps:

[0017] Polyether block amide elastomer (PEBA), stabilizer, conductive filler, and glycerol are mixed in a mass ratio of 40-90:1-3:4-15:3-6 to obtain a mixture. The mixture is then irradiated with a carbon ion beam to obtain an irradiated mixture. The irradiated mixture is then extruded through a twin-screw extruder, pelletized, and dried to obtain an antistatic masterbatch for low-humidity environments.

[0018] In one embodiment of the present invention, the carbon ion beam irradiation dose is 100-200 Gy / min, the initial energy is 80 MeV / u, and the irradiation time is 3-5 min.

[0019] In one embodiment of the present invention, extrusion by a twin-screw extruder is a blending extrusion at 210-240°C and 150-250 rpm.

[0020] A third objective of this invention is to provide an antistatic fiber prepared using the antistatic masterbatch described in this invention.

[0021] The fourth objective of this invention is to provide an antistatic fabric prepared using the antistatic masterbatch or antistatic fiber described in this invention.

[0022] The fifth objective of this invention is to provide an antistatic film prepared using the antistatic masterbatch described in this invention.

[0023] The sixth objective of this invention is the application of the antistatic masterbatch, antistatic fiber, antistatic fabric or antistatic film described herein in the field of industrial textiles.

[0024] The beneficial effects of this invention are as follows:

[0025] (1) The antistatic masterbatch prepared by the present invention has excellent environmental adaptability. Its antistatic properties remain basically unchanged at temperatures ranging from -40℃ to 80℃, and it has excellent anti-aging and anti-sun exposure capabilities.

[0026] (2) The antistatic masterbatch prepared by the present invention has good impact resistance and its performance changes very little under different environments (high and low temperature, low humidity).

[0027] (3) The antistatic masterbatch prepared by the present invention has good chemical stability due to the use of polyether block amide elastomer (PEBA).

[0028] (4) When conductive fillers are added to block polyether amide elastomers in this invention, they form a conductive network inside the material. As the content of conductive fillers increases, the connectivity of the conductive network also increases, thereby significantly improving the overall conductivity of the material. This conductive network can effectively disperse and conduct charges, avoiding static electricity accumulation, and thus significantly improving the antistatic properties of the material. However, if the amount of conductive fillers is too large, it will affect the dispersion performance, resulting in a decrease in mechanical properties and antistatic properties.

[0029] (5) The raw materials used in this invention have relatively stable performance under high and low temperature and low humidity conditions, and can still exert their own performance after forming masterbatch. Detailed Implementation

[0030] The preferred embodiments of the present invention are described below. It should be understood that the embodiments are for better explanation of the present invention and are not intended to limit the present invention.

[0031] Test method:

[0032] 1. Mechanical property testing:

[0033] According to GB / T1040 and GB / T1842, injection molding tensile, bending and impact specimens were tested, and then tensile, bending and impact tests were performed.

[0034] Tensile and bending properties were determined using a universal testing machine. The tensile rate was 5 mm / min and the temperature was 25°C. The bending rate was 2 mm / min, the span was 64 mm, and the temperature was 25°C.

[0035] Impact tests were conducted using an HT50P impact testing machine, with the test mode being a cantilever beam.

[0036] 2. Antistatic performance test:

[0037] Using a WZS10 micro injection molding machine, under the processing conditions of barrel temperature 220°C, mold temperature 60°C, and injection pressure 0.7MPa, injection molded circular sample strips with a diameter of 58mm and a thickness of 3.5mm were produced.

[0038] Surface resistivity was determined in accordance with GB / T1410.

[0039] 3. Aging resistance test:

[0040] The masterbatch was prepared into strips of 100mm*30mm*30mm and placed at 150℃ for 300h. After cooling, the strips were observed to see if they exhibited embrittlement, pulverization, carbonization, cracking, or other phenomena.

[0041] Raw materials used in the examples:

[0042] Pebax (Nylon Elastomer) MH1657: Purchased from Cosmed Plastics;

[0043] Calcium stearate: CAS: 1592-23-0; density is 1.08 g / cm³ 3 The content is 99.8%; purchased from Maoshan Dyeing Auxiliaries Factory in Liyang City;

[0044] Zinc stearate: CAS: 557-05-1; density is 1.095 g / cm³ 3 The content is 99.8%; purchased from Maoshan Dyeing Auxiliaries Factory in Liyang City;

[0045] Zinc oxide: 1μm;

[0046] Titanium dioxide: 1μm;

[0047] Glycerin: Propylene glycol, purity 99.5%, purchased from Nanjing Rongji Chemical Co., Ltd.

[0048] Example 1

[0049] A method for preparing antistatic masterbatch for low-humidity environments includes the following steps:

[0050] Pebax (nylon elastomer) MH1657, (a mixture of calcium stearate and zinc stearate in a mass ratio of 2:1), (a mixture of zinc oxide and titanium dioxide in a mass ratio of 1:1), and glycerin were mixed in a mass ratio of 70:2:10:4 to obtain a mixture.

[0051] The mixture was then irradiated with a carbon ion beam for 4 minutes at an initial energy of 80 MeV / u and an irradiation dose of 150 Gy / min to obtain the irradiated mixture.

[0052] The irradiated mixture was melt-extruded through a twin-screw extruder at 220°C and 150 rpm, pelletized, and dried to obtain an antistatic masterbatch (particle size of 1.5 mm) for use in low-humidity environments.

[0053] Example 2

[0054] In Example 1, the mass ratios of Pebax (nylon elastomer) MH1657, (a mixture of calcium stearate and zinc stearate in a mass ratio of 2:1), (a mixture of zinc oxide and titanium dioxide in a mass ratio of 1:1), and glycerol were adjusted to 60:2:10:4, while other parameters remained the same as in Example 1, to obtain an antistatic masterbatch for use in low-humidity environments.

[0055] Example 3

[0056] In Example 1, the mass ratios of Pebax (nylon elastomer) MH1657, (a mixture of calcium stearate and zinc stearate in a mass ratio of 2:1), (a mixture of zinc oxide and titanium dioxide in a mass ratio of 1:1), and glycerol were adjusted to 70:2:15:4, while other parameters remained the same as in Example 1, to obtain an antistatic masterbatch for use in low-humidity environments.

[0057] Comparative Example 1

[0058] The carbon ion beam irradiation in Example 1 was omitted, while everything else remained the same as in Example 1, resulting in an antistatic masterbatch.

[0059] Comparative Example 2

[0060] The mixture of calcium stearate and zinc stearate in the mass ratio of 2:1 in Example 1 was changed to calcium stearate, while other aspects remained the same as in Example 1, to obtain an antistatic masterbatch.

[0061] Comparative Example 3

[0062] The mixture of calcium stearate and zinc stearate in Example 1 with a mass ratio of 2:1 was adjusted to a mixture of calcium stearate and zinc stearate with a mass ratio of 1:1, while other aspects remained the same as in Example 1, to obtain an antistatic masterbatch.

[0063] Comparative Example 4

[0064] The mixture of zinc oxide and titanium dioxide in the mass ratio of 1:1 in Example 1 was changed to zinc oxide, while other aspects remained the same as in Example 1, to obtain an antistatic masterbatch.

[0065] Comparative Example 5

[0066] The mixture of zinc oxide and titanium dioxide in the mass ratio of 1:1 in Example 1 was changed to titanium dioxide, while other aspects remained the same as in Example 1, to obtain an antistatic masterbatch.

[0067] Comparative Example 6

[0068] In Example 1, zinc oxide was replaced with graphene, while other aspects remained the same as in Example 1, resulting in an antistatic masterbatch.

[0069] Comparative Example 7

[0070] In Example 1, calcium stearate was replaced with barium stearate, while other aspects remained the same as in Example 1, resulting in an antistatic masterbatch.

[0071] The obtained antistatic masterbatch was subjected to performance testing, and the test results are as follows:

[0072] Table 1 (Temperature: 25℃, Humidity: 50%)

[0073]

[0074] The obtained antistatic masterbatch was placed at -20℃ and 10% concentration for 90 days (the comparative sample was not tested because it did not meet the anti-aging requirements, and no other performance tests were needed), and performance tests were conducted. The test results are as follows:

[0075] Table 2 (Temperature: -20℃, Humidity: 10%)

[0076]

[0077] The obtained antistatic masterbatch was placed at 80℃ and 10% for 90 days (the comparative sample was not tested because it did not meet the anti-aging requirements and no other performance tests were needed), and performance tests were conducted. The test results are as follows:

[0078] Table 3 (Temperature 80℃, humidity 10%)

[0079]

[0080] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. An antistatic masterbatch for use in low-humidity environments, characterized in that, Its components are: polyether block amide elastomer, stabilizer, conductive filler, and glycerin; The mass ratio of polyether block amide elastomer, stabilizer, conductive filler and glycerin is 40-90:1-3:4-15:3-6. The stabilizer is a mixture of calcium stearate and zinc stearate; the mass ratio of calcium stearate to zinc stearate is 2:

1. The conductive filler is a mixture of zinc oxide and titanium dioxide; the mass ratio of zinc oxide to titanium dioxide is 1:

1. The preparation method of antistatic masterbatch for low humidity environments includes the following steps: Polyether block amide elastomer, stabilizer, conductive filler, and glycerol are mixed in a mass ratio of 40-90:1-3:4-15:3-6 to obtain a mixture. The mixture is then irradiated with a carbon ion beam to obtain an irradiated mixture. The irradiated mixture is then extruded through a twin-screw extruder, pelletized, and dried to obtain an antistatic masterbatch for low-humidity environments.

2. The antistatic masterbatch for low-humidity environments according to claim 1, characterized in that, The particle size of the antistatic masterbatch is 1.2-2mm.

3. A method for preparing the antistatic masterbatch for low-humidity environments as described in claim 1 or 2, characterized in that, Includes the following steps: Polyether block amide elastomer, stabilizer, conductive filler, and glycerol are mixed in a mass ratio of 40-90:1-3:4-15:3-6 to obtain a mixture. The mixture is then irradiated with a carbon ion beam to obtain an irradiated mixture. The irradiated mixture is then extruded through a twin-screw extruder, pelletized, and dried to obtain an antistatic masterbatch for low-humidity environments.

4. The method according to claim 3, characterized in that, The carbon ion beam irradiation dose is 100-200 Gy / min, the initial energy is 80 MeV / u, and the irradiation time is 3-5 min.

5. An antistatic fiber, characterized in that, It is prepared using the antistatic masterbatch described in claim 1 or 2.

6. An antistatic fabric, characterized in that, It is prepared using the antistatic masterbatch described in claim 1 or 2 or the antistatic fiber described in claim 5.

7. An antistatic film, characterized in that, It is prepared using the antistatic masterbatch described in claim 1 or 2.

8. The application of the antistatic masterbatch of claim 1 or 2, the antistatic fiber of claim 5, the antistatic fabric of claim 6, or the antistatic film of claim 7 in the field of industrial textiles.

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