Permanent antistatic polypropylene material

Abstract

The invention relates to a permanent antistatic polypropylene material, and belongs to the technical field of high polymer materials. The invention provides a permanent antistatic polypropylene material. The permanent antistatic polypropylene material comprises the following components in parts by mass: 100 parts of polypropylene, 15-25 parts of a macromolecular antistatic agent, 20-30 parts of glass fibers and 0.5-2 parts of an antioxidant, the macromolecular antistatic agent is prepared by sequentially reacting maleic anhydride grafted polypropylene with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl) ethylenediamine triacetic acid sodium salt at the temperature of 200 to 220 DEG C. The permanent antistatic polypropylene material provided by the invention has good antistatic performance, tensile strength and elongation at break at the same time.

Description

Technical Field

[0001] The invention relates to a permanent antistatic polypropylene material, belonging to the technical field of polymer materials. Background Art

[0002] Polypropylene is a non-toxic, odorless, tasteless milky white highly crystalline polymer. It is one of the lightest brands of all plastics currently 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. Polypropylene has high crystallinity, a regular structure, and excellent mechanical properties. Polypropylene has good heat resistance, its melting point is 164-170°C, and it can be sterilized above 100°C. When not affected by external forces, it does not deform at 150°C and has good stress relaxation resistance at 90°C. Therefore, polypropylene is widely used as a structural component. However, polypropylene has a high surface resistivity (10 16 ~10 18 Ω), the surface of polypropylene material is easy to accumulate charge, thus carrying static electricity, which can absorb particles in the air and affect the appearance and practical performance of polypropylene material.

[0003] At present, the antistatic properties of polypropylene materials are mainly improved by adding small molecule antistatic agents or macromolecular antistatic agents. The antistatic effect of small molecule antistatic agents is poor, and macromolecular antistatic agents are called permanent antistatic agents. However, the compatibility deviation between macromolecular antistatic agents and polypropylene makes it impossible to take both the antistatic effect and mechanical properties of polypropylene into consideration. Summary of the invention

[0004] The purpose of the present invention is to provide a permanent antistatic polypropylene material to obtain a polypropylene material having both good antistatic effect and good mechanical properties.

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

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

[0007] Preferably, the molar ratio of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt to methoxypolyethylene 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 extrudate, and the extrudate and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt are melt-extruded to obtain the macromolecular antistatic agent.

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

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

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

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

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

[0014] Preferably, the permanent antistatic polypropylene material is prepared by melt extrusion of various components in a formulated amount.

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

[0016] (1) The present invention uses maleic anhydride grafted polypropylene to react with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt in sequence, and the methoxy polyethylene glycol segment and ethylenediaminetriacetic acid sodium salt are chemically bonded to the maleic anhydride grafted polypropylene. The obtained 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 segment and the triacetate sodium salt anion in the macromolecular antistatic agent give the antistatic agent good antistatic properties.

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

[0018] (3) The maleic anhydride grafted polypropylene main chain, methoxy polyethylene glycol grafted chain segment and ethylenediaminetriacetic acid sodium salt grafted chain segment in the macromolecular antistatic agent used in the present invention work together to play a synergistic role in improving the antistatic properties 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the tensile strength variation curve of the permanent antistatic polypropylene material of Examples 1-3 and Comparative Examples 1-5 of the present invention;

[0021] Figure 2 It is a schematic diagram of the elongation at break variation curve of the permanent antistatic polypropylene materials of Examples 1-3 of the present invention and Comparative Examples 1-5. DETAILED DESCRIPTION

[0022] The following examples are intended to further illustrate 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 mass: 100 parts of polypropylene, 15 parts of macromolecular antistatic agent, 20 parts of glass fiber, and 2 parts of antioxidant. The preparation method of the macromolecular antistatic agent is as follows: 20g of maleic anhydride grafted polypropylene (maleic anhydride content is 1%, and the melt index is 150g / 10min under the test conditions of temperature of 190°C and load of 2.16kg) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight is 1000) are added to a twin-screw extruder, melt-extruded at 200°C to obtain an extrusion material, and then the extrusion material and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt are stirred evenly, and then added to a twin-screw extruder, and melt-extruded at 220°C to obtain a macromolecular antistatic agent; the ratio of the molar amount of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar amount of maleic anhydride groups in maleic anhydride grafted polypropylene is 1.1:1, and the molar ratio of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt to methoxy polyethylene glycol glycidyl ether is 1:1. The antioxidant is diphenyl isooctyl phosphite.

[0025] The preparation method of the permanent antistatic polypropylene material of this embodiment is as follows: according to the formula, the components are stirred evenly, and a twin-screw extruder is used to melt extrude at 210° C. 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 of polypropylene, 25 parts of macromolecular antistatic agent, 30 parts of glass fiber, and 1 part of antioxidant. Wherein, the preparation method of the macromolecular antistatic agent is as follows: 20g of maleic anhydride grafted polypropylene (maleic anhydride content is 1.2%, and the melt index is 100g / 10min under the test conditions of temperature being 190°C and load being 2.16kg) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight is 3000) are added into a twin-screw extruder, melt-extruded at 205°C to obtain an extrusion material, and then the extrusion material and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt are stirred evenly, and then added into a twin-screw extruder, and melt-extruded at 215°C to obtain the macromolecular antistatic agent; the ratio of the molar amount of epoxy groups in the methoxy polyethylene glycol glycidyl ether to the molar amount of maleic anhydride groups in the maleic anhydride grafted polypropylene is 1:1, and the molar ratio of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid 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 of this embodiment is as follows: according to the formula, the components are stirred evenly, and a twin-screw extruder is used to melt extrude at 210° C. 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 mass: 100 parts of polypropylene, 20 parts of macromolecular antistatic agent, 25 parts of glass fiber, and 0.5 parts of antioxidant. Wherein, the preparation method of the macromolecular antistatic agent is as follows: 20g of maleic anhydride grafted polypropylene (maleic anhydride content is 0.9%, and the melt index is 120g / 10min under the test conditions of temperature being 190°C and load being 2.16kg) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight is 2000) are added into a twin-screw extruder, melt-extruded at 210°C to obtain an extrusion material, and then the extrusion material and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt are stirred evenly, then added into a twin-screw extruder, melt-extruded at 210°C to obtain the macromolecular antistatic agent; the ratio of the molar amount of epoxy groups in the methoxy polyethylene glycol glycidyl ether to the molar amount of maleic anhydride groups in the maleic anhydride grafted polypropylene is 1.05:1, and the molar ratio of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt to methoxy polyethylene glycol glycidyl ether is 1.05:1. The antioxidant is distearyl thiodipropionate.

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

[0032] Comparative Example 1

[0033] 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 the test conditions of temperature of 190°C and load of 2.16kg) and methoxy polyethylene glycol glycidyl ether (weight average molecular weight of 2000) are added into a twin-screw extruder at 2100C. The method comprises the following steps: melt-extruding at 0°C to obtain an extrudate, and then uniformly stirring the extrudate and trimethyl[3-(trimethoxysilyl)propyl]ammonium chloride, and then adding the extrudate into a twin-screw extruder, and melt-extruding at 210°C to obtain a macromolecular antistatic agent; the molar amount of the epoxy group in the methoxy polyethylene glycol glycidyl ether and the molar amount of the maleic anhydride group in the maleic anhydride grafted polypropylene is 1.05:1, and the molar ratio of trimethyl[3-(trimethoxysilyl)propyl]ammonium chloride and methoxy polyethylene glycol glycidyl ether is 1.05:1.

[0034] Comparative Example 2

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

[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 is 0.9%, and the melt index is 120g / 10min under the test conditions of temperature of 190°C and load of 2.16kg), methoxy polyethylene glycol glycidyl ether (weight average molecular weight is 2000) and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt are stirred evenly, then added into a twin-screw extruder, and melt-extruded at 210°C to obtain the macromolecular antistatic agent; the ratio of the molar amount of epoxy groups in methoxy polyethylene glycol glycidyl ether to the molar amount of maleic anhydride groups in maleic anhydride grafted polypropylene is 1.05:1, and the molar ratio of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid 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 of this comparative example and the permanent antistatic polypropylene material of Example 3 is that the maleic anhydride content of the maleic anhydride grafted polypropylene used in the preparation of the macromolecular antistatic agent in the permanent antistatic polypropylene material of this comparative example is 0.8%, and the melt index is 60g / 10min under the test conditions of temperature of 190°C and load of 2.16kg.

[0040] Comparative Example 5

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

[0042] Experimental example

[0043] In this experimental example, the permanent antistatic polypropylene materials of Examples 1-3 and Comparative Examples 1-5 were tested for antistatic performance and mechanical properties. The antistatic performance was characterized by surface resistivity. The surface resistivity was tested 12 hours after the permanent antistatic polypropylene materials were prepared and after 6 months of storage. The surface resistivity was tested according to the method specified in the standard GB / T1410 (the ambient temperature during the test was 20±5°C and the relative humidity was 60±5%). The mechanical properties were characterized by tensile strength and elongation at break. The tensile strength and elongation at break were tested according to the method specified in the standard GB / T1040.1. The test results of the surface resistivity, tensile strength and elongation at break of the permanent antistatic polypropylene materials of Examples 1-3 and Comparative Examples 1-5 are shown in Tables 1 and Figure 1-2 shown.

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

[0045]

[0046] From Table 1, Figure 1 and Figure 2It can be 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 triacetic acid sodium salt, and the macromolecular antistatic agent has good compatibility with the polypropylene matrix, the polyethylene glycol hydrophilic segment and the triacetate sodium salt anion in the macromolecular antistatic agent give the antistatic agent good lasting antistatic performance, and the triacetate sodium salt can increase the polarity of the polymer matrix and improve the material strength, while the flexible methoxy polyethylene glycol segment can improve the toughness of the material. The permanent antistatic polypropylene material prepared by the present invention has good antistatic performance, tensile strength and elongation at break.

Claims

1. A permanent antistatic polypropylene material, characterized in that: The invention comprises the following components in parts by weight: 100 parts of polypropylene, 15-25 parts of macromolecular antistatic agent, 20-30 parts of glass fiber and 0.5-2 parts of antioxidant; the macromolecular antistatic agent is prepared by reacting maleic anhydride grafted polypropylene with methoxy polyethylene glycol glycidyl ether and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt in sequence at 200-220 DEG C.

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

1.

3. The permanent antistatic polypropylene material according to claim 1, characterized in that: The molar ratio of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt and methoxypolyethylene glycol glycidyl ether is (1-1.1):

1.

4. The permanent antistatic polypropylene material according to any one of claims 1 to 3, characterized in that: 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 extrudate, and the extrudate and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt are melt-extruded to obtain the macromolecular antistatic agent.

5. The permanent antistatic polypropylene material according to claim 4, characterized in that: The temperature for melt extrusion of maleic anhydride grafted polypropylene and methoxy polyethylene glycol glycidyl ether is 200-210°C; the temperature for melt extrusion of the extrudate and N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt is 210-220°C.

6. The permanent antistatic polypropylene material according to any one of claims 1 to 3, characterized in that: The content of maleic anhydride in the maleic anhydride grafted polypropylene is 0.9-1.2%.

7. The permanent antistatic polypropylene material according to any one of claims 1 to 3, characterized in that: The melt index of the maleic anhydride grafted polypropylene is 100-150 g / 10 min under the test conditions of a temperature of 190° C. and a load of 2.16 kg.

8. The permanent antistatic polypropylene material according to any one of claims 1 to 3, characterized in that: The weight average molecular weight of methoxy polyethylene glycol glycidyl ether is 1,000 to 3,000.

9. The permanent antistatic polypropylene material according to any one of claims 1 to 3, characterized in that: The antioxidant is dioctadecyl thiodipropionate, 4'4-thiobis(6-tert-butyl-o-cresol) or diisooctyl phosphite.

10. The permanent antistatic polypropylene material according to any one of claims 1 to 3, characterized in that: The permanent antistatic polypropylene material is prepared by melt extrusion of various components in a prescribed amount.

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