Pressure-resistant and fatigue-resistant polypropylene material and preparation method thereof

Abstract

The invention discloses a pressure-resistant and fatigue-resistant polypropylene material and a preparation method thereof, and belongs to the field of high polymer materials. The pressure-resistant and fatigue-resistant polypropylene material comprises the following raw materials in parts by weight: 20-60 parts of polypropylene, 0.1-0.3 part of a nucleating agent, 40-80 parts of modified mineral filled master batch, 0-2 parts of a lubricant and 0-2 parts of an antioxidant, the preparation method of the modified mineral filled master batch comprises the following steps: adding calcium carbonate and talcum powder into a high-speed mixer, and mixing to obtain premixed mineral powder; adding a silane coupling agent, ethylene bis stearamide, white oil, calcium stearate and epoxy resin, and mixing; and adding the obtained mixture and polypropylene resin into an extruder for side feeding, extruding, pelletizing and drying to obtain the modified mineral filled master batch.

Description

Technical Field

[0001] The invention relates to the field of polymer materials, and in particular to a pressure-resistant and fatigue-resistant polypropylene material and a preparation method thereof. Background Art

[0002] Polypropylene resin is a widely used general-purpose plastic because of its good comprehensive mechanical properties, low density and good chemical stability, especially because of its good chemical stability, excellent mechanical properties and easy processing. Its properties can be adjusted through modification, filling, alloying and other means, so that it can be used in many special occasions.

[0003] As a widely used household appliance, household water purifiers protect drinking water safety and add convenience to daily life. Especially with people's concern about health, it has almost become a standard feature of comfortable household appliances. At the same time, new product requirements such as intelligence and functionality require that materials not only consider performance, but also face challenges in terms of aging resistance and fatigue resistance. The filter element, as a key component in a water purifier, plays the role of filtering and purifying water quality and is generally installed in a filter element barrel. Therefore, the material for preparing the filter element barrel must not only take into account environmental protection and food grade requirements, but also the presence of water during use, which causes great pressure on the barrel during the filtration process, and the water hammer phenomenon caused by the water flow, which puts higher requirements on the stability of the material, water pressure resistance, and fatigue resistance, in order to ensure that the water purification product will not cause problems such as bursting and leakage during use, affecting the product's service life and threatening consumer safety. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a pressure-resistant and fatigue-resistant polypropylene material and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The first aspect of the present invention relates to a pressure-resistant and fatigue-resistant polypropylene material, comprising the following raw materials in parts by weight:

[0007] Polypropylene 20-60 parts, nucleating agent 0.1-0.3 parts, modified mineral filler masterbatch 40-80 parts, lubricant 0-2 parts and antioxidant 0-2 parts;

[0008] The preparation method of the modified mineral filler masterbatch comprises the following steps:

[0009] Add calcium carbonate and talcum powder into a high-speed mixer and mix to obtain premixed mineral powder;

[0010] Then add silane coupling agent, ethylene bisstearamide, white oil, calcium stearate and epoxy resin and mix;

[0011] The obtained mixture and polypropylene resin are added into the side feed of the extruder, and the modified mineral filling masterbatch is obtained after extrusion, pelletization and drying.

[0012] Optionally, the mesh sizes of calcium carbonate and talc are 5000 and 3000 respectively.

[0013] Optionally, the mass ratio of calcium carbonate and talcum powder is 1:2; the mass ratio of premixed mineral powder to silane coupling agent, ethylene bisstearamide, white oil, calcium stearate, and epoxy resin is 60:1:1:1:1:0.5; and the mass ratio of the mixture to polypropylene resin is 1:1.

[0014] Optionally, the antioxidant is at least one of a hindered amine antioxidant, a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant.

[0015] Optionally, the lubricant is at least one of EBS, EBH, TAF, and PETS.

[0016] Optionally, the nucleating agent is a phosphate nucleating agent.

[0017] Optionally, the polypropylene has a melt index of 2 to 30 g / 10 min at 230° C. and 2.16 kg.

[0018] Optionally, toner is also included.

[0019] A second aspect of the present invention relates to a method for preparing a pressure-resistant and fatigue-resistant polypropylene material, comprising the following steps:

[0020] Add calcium carbonate and talcum powder into a high-speed mixer and mix to obtain premixed mineral powder;

[0021] Then add silane coupling agent, ethylene bisstearamide, white oil, calcium stearate and epoxy resin and mix;

[0022] The obtained mixture and polypropylene resin are added to the side feed of the extruder, and the modified mineral filling masterbatch is obtained after extrusion, pelletization and drying;

[0023] 40-80 parts by weight of modified mineral filler masterbatch and 20-60 parts by weight of polypropylene are fully mixed, and then 0.1-0.3 parts by weight of nucleating agent, 0-2 parts by weight of lubricant and 0-2 parts by weight of antioxidant are added, and the mixture is fed into a screw extruder for melt extrusion and granulation to obtain the pressure-resistant and fatigue-resistant polypropylene material.

[0024] A third aspect of the present invention relates to a water purifier filter cartridge barrel, which is made of the above-mentioned pressure-resistant and fatigue-resistant polypropylene material.

[0025] The beneficial effects of the present invention are as follows:

[0026] (1) The present invention is based on the preferred high crystallinity, low melt index polypropylene material. A small amount of nucleating agent is added to improve the performance of the polypropylene material while ensuring the size and stability of the material. Mineral fillers of different contents, types, sizes, and treatment methods are matched to adjust the stability of the finished product without affecting the fatigue resistance and strength.

[0027] (2) The present invention preforms surface-treated mineral masterbatches, which, on the one hand, reduce product density fluctuations caused by uneven feeding during the production process, and on the other hand, modify the surface of the mineral filler to increase its compatibility with the polypropylene material without affecting the tensile strength of the raw materials to the greatest extent. The masterbatch is then evenly mixed with the remaining raw materials of the polypropylene and melt-extruded, which helps to further improve the fatigue resistance, mechanical properties and appearance quality of the material.

[0028] In summary, the polypropylene composite material of the present invention has the characteristics of stable quality, high pressure resistance, fatigue resistance, and good mechanical properties, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Figure 1 This is a graph showing the results of the explosion test of the pressure-resistant and fatigue-resistant polypropylene material and the general low melt index homopolymer PP filter element barrel (melt index range 3-5) material of Example 1 of the present application. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In an embodiment of the present invention, the preparation method of the modified mineral filler masterbatch comprises the following steps:

[0033] (1) Add calcium carbonate and talcum powder in a high-pressure mixer in a mass ratio of 1:2 and premix for 5 minutes;

[0034] (2) adding silane coupling agent KH-560, ethylene bis stearamide EBS, white oil, calcium stearate, and high-flowability epoxy resin to the premixed mineral powder in step (1), and mixing at high speed for 30 minutes; the mass ratio of the premixed mineral powder to the silane coupling agent, ethylene bis stearamide, white oil, calcium stearate, and epoxy resin is 60:1:1:1:1:0.5;

[0035] (3) adding the mineral powder premixed in step (2) to the side feed of the extruder, and adding the polypropylene resin to the main feed in a mass ratio of 1:1, and obtaining the modified mineral filler masterbatch after extrusion, pelletization and drying.

[0036] Example 1

[0037] A pressure-resistant and fatigue-resistant polypropylene material comprises the following raw materials in parts by weight: 40 parts of polypropylene powder, 0.1 parts of NA-11 nucleating agent, 60 parts of modified mineral filler masterbatch, 1 part of lubricant calcium stearate compounded with EBS, 1 part of antioxidant 168, 1010, DSTP compounded, and 2 parts of titanium white powder;

[0038] The preparation method of the pressure-resistant and fatigue-resistant polypropylene material of the present embodiment comprises the following steps:

[0039] Firstly, the modified mineral filler masterbatch is fully mixed with polypropylene, and then the remaining raw materials are added and mixed evenly, and then added into a screw extruder for melt extrusion and granulation to obtain the product.

[0040] Comparative Example 1

[0041] 70 parts of polypropylene powder, 10 parts of calcium carbonate, 20 parts of talc, 0.1 parts of NA-11 nucleating agent, 1 part of lubricant calcium stearate compound EBS, 1 part of antioxidant 168, 1010, DSTP compound, 2 parts of titanium white powder;

[0042] The preparation method of the polypropylene composite material is:

[0043] The raw materials are added into a high-speed mixer and mixed thoroughly, and then added into a screw extruder for melt extrusion and granulation at 180-220°C to obtain the product.

[0044] The performance of the polypropylene composite materials obtained in Example 1 and Comparative Example 1 was tested, and the results are shown in Table 1:

[0045] Table 1

[0046]

[0047] In the comparative experiment of filter cartridge materials on the market in Example 1 of the present application, Figure 1 As shown, the product produced using the material of Example 1 (first on the left) is intact as a whole after the water pressure test, while the top, spin-melted part and bottle body of the commercial filter cartridge material are cracked.

[0048] In the above embodiment, ethylene bisstearamide is used as a reactive surface treatment agent, which is different from the conventional lubricant. Similarly, epoxy resin is also used as a reactive component rather than a compatibilizer, thereby making the modified mineral filler masterbatch prepared in this embodiment more compatible and dispersible, and ultimately making the product prepared in this embodiment have better mechanical properties.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A pressure-resistant and fatigue-resistant polypropylene material, characterized in that: It includes the following raw materials in parts by weight: Polypropylene 20-60 parts, nucleating agent 0.1-0.3 parts, modified mineral filler masterbatch 40-80 parts, lubricant 0-2 parts and antioxidant 0-2 parts; The preparation method of the modified mineral filler masterbatch comprises the following steps: Add calcium carbonate and talcum powder into a high-speed mixer and mix to obtain premixed mineral powder; Then add silane coupling agent, ethylene bisstearamide, white oil, calcium stearate and epoxy resin and mix; The obtained mixture and polypropylene resin are added into the side feed of the extruder, and the modified mineral filling masterbatch is obtained after extrusion, pelletization and drying.

2. The pressure-resistant and fatigue-resistant polypropylene material according to claim 1, characterized in that: The mesh numbers of the calcium carbonate and talc are 5000 and 3000 respectively.

3. The pressure-resistant and fatigue-resistant polypropylene material according to claim 1, characterized in that: The mass ratio of the calcium carbonate and talcum powder is 1:2; the mass ratio of the premixed mineral powder to the silane coupling agent, ethylene bisstearamide, white oil, calcium stearate, and epoxy resin is 60:1:1:1:1:0.5; and the mass ratio of the mixture to the polypropylene resin is 1:

1.

4. The pressure-resistant and fatigue-resistant polypropylene material according to claim 1, characterized in that: The antioxidant is at least one of a hindered amine antioxidant, a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant.

5. The pressure-resistant and fatigue-resistant polypropylene material according to claim 1, characterized in that: The lubricant is at least one of EBS, EBH, TAF and PETS.

6. The pressure-resistant and fatigue-resistant polypropylene material according to claim 1, characterized in that: The nucleating agent is a phosphate nucleating agent.

7. The pressure-resistant and fatigue-resistant polypropylene material according to claim 1, characterized in that: The polypropylene has a melting index of 2 to 30 g / 10 min at 230° C. and 2.16 kg.

8. The pressure-resistant and fatigue-resistant polypropylene material according to claim 1, characterized in that: Also includes color powder.

9. A method for preparing a pressure-resistant and fatigue-resistant polypropylene material, characterized in that: The following steps are involved: Add calcium carbonate and talcum powder into a high-speed mixer and mix to obtain premixed mineral powder; Then add silane coupling agent, ethylene bisstearamide, white oil, calcium stearate and epoxy resin and mix; The obtained mixture and polypropylene resin are added to the side feed of the extruder, and the modified mineral filling masterbatch is obtained after extrusion, pelletization and drying; 40-80 parts by weight of modified mineral filler masterbatch and 20-60 parts by weight of polypropylene are fully mixed, and then 0.1-0.3 parts by weight of nucleating agent, 0-2 parts by weight of lubricant and 0-2 parts by weight of antioxidant are added, and the mixture is fed into a screw extruder for melt extrusion and granulation to obtain the pressure-resistant and fatigue-resistant polypropylene material.

10. A water purifier filter cartridge barrel, made of the pressure-resistant and fatigue-resistant polypropylene material according to any one of claims 1 to 8.

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