A permanent antistatic polypropylene material

Abstract

This invention relates to a permanent antistatic polypropylene material, belonging to the field of polymer materials technology. The invention provides a permanent antistatic polypropylene material comprising the following components in parts by weight: 100 parts polypropylene, 15-25 parts macromolecular antistatic agent, 20-30 parts glass fiber, and 0.5-2 parts antioxidant; the macromolecular antistatic agent is prepared by reacting maleic anhydride-grafted polypropylene sequentially with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt at 200-220°C. The permanent antistatic polypropylene material of this invention simultaneously possesses good antistatic properties, tensile strength, and elongation at break.

Description

Technical Field

[0001] This invention relates to a permanent antistatic polypropylene material, belonging to the field of polymer materials technology. Background Technology

[0002] Polypropylene (PP) is a non-toxic, odorless, and tasteless milky-white highly crystalline polymer, and it is one of the lightest plastics available. It is very stable to water, with a 24-hour water absorption rate of only 0.01%, and a molecular weight of approximately 80,000-150,000. PP has high crystallinity, a regular structure, and excellent mechanical properties. PP has good heat resistance, with a melting point of 164-170℃, and can be sterilized above 100℃. When not subjected to external force, it does not deform at 150℃ and exhibits good stress relaxation resistance at 90℃. Therefore, PP is widely used as a structural component. However, PP has a relatively high surface resistivity (10⁻⁶ Ω·cm). 16 ~10 18 Polypropylene materials (Ω) tend to accumulate charges on their surface, thus becoming statically charged. This static charge can attract particles from the air, affecting the appearance and practical performance of the polypropylene material.

[0003] Currently, the antistatic properties of polypropylene materials are mainly improved by adding small-molecule or large-molecule antistatic agents. Small-molecule antistatic agents have poor antistatic durability, while large-molecule antistatic agents are called permanent antistatic agents. However, the compatibility between large-molecule antistatic agents and polypropylene is poor, which means that the antistatic effect and mechanical properties of polypropylene cannot be achieved simultaneously. Summary of the Invention

[0004] The purpose of this invention is to provide a permanently antistatic polypropylene material to obtain a polypropylene material that has both good antistatic effect and good mechanical properties.

[0005] This invention provides a permanent antistatic polypropylene material comprising the following components in parts by weight: 100 parts polypropylene, 15-25 parts macromolecular antistatic agent, 20-30 parts glass fiber, and 0.5-2 parts antioxidant; wherein the macromolecular antistatic agent is prepared by reacting maleic anhydride-grafted polypropylene with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt sequentially at 200-220°C.

[0006] Preferably, the molar ratio of the epoxy group in methoxy polyethylene glycol glycidyl ether to the molar ratio of the maleic anhydride group in maleic anhydride-grafted polypropylene is (1-1.1):1.

[0007] Preferably, the molar ratio of sodium N-(trimethoxysilylpropyl)ethylenediamine triacetate and methoxy polyethylene glycol glycidyl ether is (1-1.1):1.

[0008] Preferably, the preparation method of the macromolecular antistatic agent is as follows: maleic anhydride-grafted polypropylene and methoxy polyethylene glycol glycidyl ether are melt-extruded to obtain an extruded material, and then the extruded material and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt are melt-extruded to obtain a macromolecular antistatic agent.

[0009] Preferably, the melt extrusion temperature of maleic anhydride-grafted polypropylene and methoxy polyethylene glycol glycidyl ether is 200–210°C; the melt extrusion temperature of the extrudate and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt is 210–220°C.

[0010] Preferably, the maleic anhydride content in the maleic anhydride-grafted polypropylene is 0.9% to 1.2%.

[0011] Preferably, the melt index of maleic anhydride-grafted polypropylene is 100–150 g / 10 min under test conditions of 190 °C and 2.16 kg load.

[0012] Preferably, the weight-average molecular weight of methoxy polyethylene glycol glycidyl ether is 1000 to 3000.

[0013] Preferably, the antioxidant is di(octadecyl) thiodipropionate, 4',4-thiobis(6-tert-butyl-o-cresol) or diphenylisooctyl phosphite.

[0014] Preferably, the permanent antistatic polypropylene material is obtained by melt extrusion of the various components in the formula.

[0015] The beneficial effects of this invention are as follows:

[0016] (1) In this invention, maleic anhydride-grafted polypropylene is reacted sequentially with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt. The methoxy polyethylene glycol segments and ethylenediamine triacetate sodium salt are chemically bonded to the maleic anhydride-grafted polypropylene. The resulting macromolecular antistatic agent not only retains the good compatibility between the maleic anhydride-grafted polypropylene and the polypropylene matrix, but also the polyethylene glycol hydrophilic segments and triacetate sodium salt anions in the macromolecular antistatic agent endow the antistatic agent with good antistatic properties.

[0017] (2) The chemically bonded sodium triacetate in the macromolecular antistatic agent used in this invention can increase the polarity of the polymer matrix and improve the strength of the material, while the chemically bonded flexible methoxy polyethylene glycol segments can improve the toughness of the material.

[0018] (3) In the macromolecular antistatic agent used in this invention, the maleic anhydride-grafted polypropylene backbone, the methoxy polyethylene glycol grafted chain segment, and the sodium ethylenediamine triacetate grafted chain segment work together to enhance the antistatic and mechanical properties of the polypropylene matrix.

[0019] (4) The permanent antistatic polypropylene material prepared by the present invention has good antistatic properties, tensile strength and elongation at break. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the tensile strength variation curves of the permanently antistatic polypropylene materials in Examples 1-3 and Comparative Examples 1-5 of the present invention.

[0021] Figure 2 This is a schematic diagram of the elongation at break curves of the permanently antistatic polypropylene materials in Examples 1-3 and Comparative Examples 1-5 of the present invention. Detailed Implementation

[0022] The following examples are intended to further illustrate the content of the present invention, rather than to limit the scope of protection of the present invention.

[0023] Example 1

[0024] The permanent antistatic polypropylene material of this embodiment is composed of the following components in parts by weight: 100 parts polypropylene, 15 parts macromolecular antistatic agent, 20 parts glass fiber, and 2 parts antioxidant. The preparation method of the macromolecular antistatic agent is as follows: 20g of maleic anhydride-grafted polypropylene (maleic anhydride content of 1%, melt index of 150g / 10min under test conditions of 190℃ and 2.16kg load) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight of 1000) are added to a twin-screw extruder and melt-extruded at 200℃ to obtain the extrudate. The extrudate and sodium N-(trimethoxysilylpropyl)ethylenediamine triacetate are then stirred evenly and added to a twin-screw extruder, and melt-extruded at 220℃ to obtain the macromolecular antistatic agent. The molar ratio of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar ratio of maleic anhydride groups in maleic anhydride-grafted polypropylene is 1.1:1, and the molar ratio of sodium N-(trimethoxysilylpropyl)ethylenediamine triacetate to methoxy polyethylene glycol glycidyl ether is 1:1. The antioxidant is diphenylisooctyl phosphite.

[0025] The preparation method of the permanent antistatic polypropylene material in this embodiment is as follows: According to the formula, the components are stirred evenly, and the mixture is melt-extruded at 210°C using a twin-screw extruder to obtain the permanent antistatic polypropylene material.

[0026] Example 2

[0027] The permanent antistatic polypropylene material of this embodiment is composed of the following components in parts by weight: 100 parts polypropylene, 25 parts macromolecular antistatic agent, 30 parts glass fiber, and 1 part antioxidant. The preparation method of the macromolecular antistatic agent is as follows: 20g of maleic anhydride-grafted polypropylene (maleic anhydride content of 1.2%, melt index of 100g / 10min under test conditions of 190℃ and 2.16kg load) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight of 3000) are added to a twin-screw extruder and melt-extruded at 205℃ to obtain extrudate. The extrudate and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt are then stirred evenly and added to a twin-screw extruder and melt-extruded at 215℃ to obtain the macromolecular antistatic agent. The molar ratio of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar ratio of maleic anhydride groups in maleic anhydride-grafted polypropylene is 1:1, and the molar ratio of N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt to methoxy polyethylene glycol glycidyl ether is 1.1:1. The antioxidant is 4',4-thiobis(6-tert-butyl-o-cresol).

[0028] The preparation method of the permanent antistatic polypropylene material in this embodiment is as follows: According to the formula, the components are stirred evenly, and the mixture is melt-extruded at 210°C using a twin-screw extruder to obtain the permanent antistatic polypropylene material.

[0029] Example 3

[0030] The permanent antistatic polypropylene material of this embodiment is composed of the following components in parts by weight: 100 parts polypropylene, 20 parts macromolecular antistatic agent, 25 parts glass fiber, and 0.5 parts antioxidant. The preparation method of the macromolecular antistatic agent is as follows: 20g of maleic anhydride-grafted polypropylene (maleic anhydride content of 0.9%, melt index of 120g / 10min under test conditions of 190℃ and 2.16kg load) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight of 2000) are added to a twin-screw extruder and melt-extruded at 210℃ to obtain extrudate. The extrudate and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt are then stirred evenly and added to a twin-screw extruder and melt-extruded at 210℃ to obtain the macromolecular antistatic agent. The molar ratio of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar ratio of maleic anhydride groups in maleic anhydride-grafted polypropylene is 1.05:1, and the molar ratio of N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt to methoxy polyethylene glycol glycidyl ether is 1.05:1. The antioxidant is di(octadecyl) thiodipropionate.

[0031] The preparation method of the permanent antistatic polypropylene material in this embodiment is as follows: According to the formula, the components are stirred evenly, and the mixture is melt-extruded at 210°C using a twin-screw extruder to obtain the permanent antistatic polypropylene material.

[0032] Comparative Example 1

[0033] The difference between the permanently antistatic polypropylene material of this comparative example and the permanently antistatic polypropylene material of Example 3 is that the preparation method of the macromolecular antistatic agent used in the permanently antistatic polypropylene material of this comparative example is as follows: 20g of maleic anhydride-grafted polypropylene (maleic anhydride content of 0.9%, melt index of 120g / 10min under test conditions of 190℃ and 2.16kg load) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight of 2000) are added to a twin-screw extruder and heated to 21℃. The material is melt-extruded at 0°C to obtain an extrudate. The extrudate is then mixed with trimethyl[3-(trimethoxysilyl)propyl]ammonium chloride and added to a twin-screw extruder. The mixture is melt-extruded at 210°C to obtain a macromolecular antistatic agent. The molar ratio of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar ratio of maleic anhydride groups in maleic anhydride-grafted polypropylene is 1.05:1, and the molar ratio of trimethyl[3-(trimethoxysilyl)propyl]ammonium chloride to methoxy polyethylene glycol glycidyl ether is 1.05:1.

[0034] Comparative Example 2

[0035] The difference between the permanent antistatic polypropylene material in this comparative example and the permanent antistatic polypropylene material in Example 3 is that the macromolecular antistatic agent used in the preparation of the permanent antistatic polypropylene material in this comparative example has a weight-average molecular weight of 5000 for methoxy polyethylene glycol glycidyl ether.

[0036] Comparative Example 3

[0037] The difference between the permanent antistatic polypropylene material of this comparative example and the permanent antistatic polypropylene material of Example 3 is that the preparation method of the macromolecular antistatic agent used in the permanent antistatic polypropylene material of this comparative example is as follows: 20g of maleic anhydride-grafted polypropylene (maleic anhydride content of 0.9%, melt index of 120g / 10min under test conditions of 190℃ and 2.16kg load), methoxy polyethylene glycol glycidyl ether (weight average molecular weight of 2000) and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt are stirred evenly, and then added to a twin-screw extruder and melt-extruded at 210℃ to obtain the macromolecular antistatic agent; the molar ratio of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar ratio of maleic anhydride groups in maleic anhydride-grafted polypropylene is 1.05:1, and the molar ratio of N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt to methoxy polyethylene glycol glycidyl ether is 1.05:1.

[0038] Comparative Example 4

[0039] The difference between the permanent antistatic polypropylene material in this comparative example and the permanent antistatic polypropylene material in Example 3 is that the maleic anhydride content of the maleic anhydride-grafted polypropylene used in the preparation of the macromolecular antistatic agent in this comparative example is 0.8%, and the melt index is 60 g / 10 min under the test conditions of 190°C and 2.16 kg load.

[0040] Comparative Example 5

[0041] The difference between the permanent antistatic polypropylene material in this comparative example and the permanent antistatic polypropylene material in Example 3 is that the macromolecular antistatic agent in this comparative example is replaced by an equal mass of maleic anhydride-grafted polypropylene (maleic anhydride content of 0.9%, melt index of 120 g / 10 min under test conditions of 190°C and 2.16 kg load), methoxy polyethylene glycol glycidyl ether (weight average molecular weight of 2000), and sodium N-(trimethoxysilylpropyl)ethylenediamine triacetate. The molar ratio of the epoxy group in the methoxy polyethylene glycol glycidyl ether to the molar ratio of the maleic anhydride group in the maleic anhydride-grafted polypropylene is 1.05:1, and the molar ratio of sodium N-(trimethoxysilylpropyl)ethylenediamine triacetate to methoxy polyethylene glycol glycidyl ether is 1.05:1.

[0042] Experimental Example

[0043] In this experiment, the antistatic and mechanical properties of the permanently antistatic polypropylene materials from Examples 1-3 and Comparative Examples 1-5 were tested. Antistatic properties were characterized by surface resistivity, which was measured 12 hours after preparation and 6 months after storage. Surface resistivity was tested according to the method specified in standard GB / T1410 (ambient temperature 20±5℃, relative humidity 60±5%). Mechanical properties were characterized by tensile strength and elongation at break, which were tested according to the method specified in standard GB / T1040.1. The test results of surface resistivity, tensile strength, and elongation at break of the permanently antistatic polypropylene materials from Examples 1-3 and Comparative Examples 1-5 are shown in Table 1 and... Figure 1-2 As shown.

[0044] Table 1. Surface resistivity, tensile strength, and elongation at break of the permanently antistatic polypropylene materials of Examples 1-3 and Comparative Examples 1-5

[0045]

[0046] From Table 1, Figure 1 and Figure 2It is known that the permanent antistatic polypropylene material of the present invention is prepared by sequentially reacting maleic anhydride-grafted polypropylene with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl)ethylenediamine sodium triacetate. The macromolecular antistatic agent prepared has good compatibility with the polypropylene matrix. The hydrophilic polyethylene glycol segments and sodium triacetate anions in the macromolecular antistatic agent endow the antistatic agent with good and long-lasting antistatic properties. Furthermore, sodium triacetate can increase the polarity of the polymer matrix and improve the material strength, while the flexible methoxy polyethylene glycol segments can improve the toughness of the material. The permanent antistatic polypropylene material prepared by the present invention also has good antistatic properties, tensile strength, and elongation at break.

Claims

1. A permanent antistatic polypropylene material, characterized in that, The product comprises the following components in parts by weight: 100 parts polypropylene, 15-25 parts macromolecular antistatic agent, 20-30 parts glass fiber, and 0.5-2 parts antioxidant; the macromolecular antistatic agent is prepared by reacting maleic anhydride-grafted polypropylene sequentially with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt at 200-220°C; the weight-average molecular weight of the methoxy polyethylene glycol glycidyl ether is 1000-3000; the macromolecular antistatic agent... The preparation method is as follows: maleic anhydride-grafted polypropylene and methoxy polyethylene glycol glycidyl ether are melt-extruded to obtain extruded material, and then the extruded material and N-(trimethoxysilylpropyl)ethylenediamine triacetic acid sodium salt are melt-extruded to obtain a macromolecular antistatic agent; the melt index of maleic anhydride-grafted polypropylene is 100~150g / 10min under the test conditions of 190℃ and 2.16kg load, and the maleic anhydride content in maleic anhydride-grafted polypropylene is 0.9~1.2%.

2. The permanent antistatic polypropylene material as described in claim 1, characterized in that, The molar ratio of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar ratio of maleic anhydride groups in maleic anhydride-grafted polypropylene is (1~1.1):

1.

3. The permanent antistatic polypropylene material as described in claim 1, characterized in that, The molar ratio of sodium N-(trimethoxysilylpropyl)ethylenediamine triacetate to methoxy polyethylene glycol glycidyl ether is (1~1.1):

1.

4. The permanent antistatic polypropylene material as described in claim 1, characterized in that, The melt extrusion temperature for maleic anhydride-grafted polypropylene and methoxy polyethylene glycol glycidyl ether is 200~210℃; the melt extrusion temperature for extruded material and N-(trimethoxysilylpropyl)ethylenediamine triacetate sodium salt is 210~220℃.

5. The permanent antistatic polypropylene material according to any one of claims 1-3, characterized in that, The antioxidants are di(octadecyl) thiodipropionate, 4',4-thiobis(6-tert-butyl-o-cresol), or diphenylisooctyl phosphite.

6. The permanent antistatic polypropylene material according to any one of claims 1-3, characterized in that, The permanent antistatic polypropylene material is prepared by melt extrusion of the various components in the formula.

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