Modified black talcum powder filled plastic as well as preparation method and application thereof

Abstract

The invention provides modified black talcum powder filled plastic as well as a preparation method and application thereof, and belongs to the technical field of plastic material modification. The modified black talcum powder filled plastic is obtained by modifying the black talcum powder and filling the modified black talcum powder into the PP resin, and the problem that the performance of the modified plastic needs to be improved in the prior art is solved. The modified black talcum powder filled plastic provided by the invention has the advantages of excellent impact strength, tensile strength, bending strength and the like, low cost and wide application prospect. The method has important significance in improving the additional value of the black talc, developing a new application direction and guiding the development of the black talc industry.

Description

Technical Field

[0001] The invention relates to the technical field of plastic material modification, in particular to a modified black talcum powder filled plastic and a preparation method and application thereof. Background Art

[0002] Plastic modification technology refers to the improvement or functional enhancement of general-purpose resins through physical, chemical or mechanical means to improve their electrical, magnetic, optical, thermal, aging resistance, flame retardancy and mechanical properties to meet application requirements under specific environmental conditions. This technology runs through the production process of raw resins to the development of diversified specifications and varieties of modified plastic masterbatches, aiming to reduce the cost of plastic products and enhance their functionality.

[0003] Inorganic powder materials have a long history of use as fillers in the field of rubber and plastic processing. Due to its wide range of sources, low cost, diverse varieties and specifications, large filling amount and free coloring, inorganic powder fillers have become the second most important material in plastic processing after matrix materials. However, inorganic fillers also have some inherent defects. For example, their inertness and hydrophilicity lead to poor compatibility with hydrophobic matrix resins and weak bonding, which will have an adverse effect on the physical and mechanical properties of composite materials. In addition, some inorganic powders also show shortcomings such as lack of sufficient reinforcement, easy agglomeration, poor dispersibility, low cross-linking and relatively high prices.

[0004] Chinese patent CN104725701A discloses a far-infrared negative ion powder filled modified plastic, which is made of the following raw materials in parts by weight: polystyrene resin 30-40, polyethylene 55-65, nano antimony tin oxide 3.8-6.1, nano titanium dioxide 0.8-1.2, ethylenediamine 0.4-0.6, sodium bisulfite 0.1-0.3, far-infrared negative ion powder 1-3, epoxy soybean oil 2-4, antioxidant 168 0.6-0.8, aniline methyl trimethoxy silane 0.5-0.7, dimethylthiotoluenediamine 0.6-0.9, and an appropriate amount of anhydrous ethanol. The invention first adds the nano material to the coupling agent for stirring activation, and then mixes it evenly with the polystyrene resin, polyethylene, antioxidant 168, far-infrared negative ion powder, etc., and then melt-extrudes and granulates it through a twin-screw extruder. The obtained plastic is antioxidant and corrosion-resistant, and can release negative oxygen ions and emit far-infrared rays.

[0005] However, the materials in the above-mentioned prior art are complex, costly, and have limited mechanical properties. Summary of the invention

[0006] The object of the present invention is to provide a modified black talcum powder filled plastic and a preparation method and application thereof, which has better mechanical properties.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a method for preparing a modified black talcum powder filled plastic, comprising the following steps:

[0009] The black talc powder is mixed with stearic acid and subjected to modification treatment to obtain modified black talc powder;

[0010] The modified black talcum powder is mixed with plastic, and then the modified black talcum powder filled plastic is obtained through banburying and granulation.

[0011] Preferably, the plastic is selected from one or more of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, polyamide, polycarbonate, polyoxymethylene, polyethylene terephthalate, polybutylene terephthalate, polytetrafluoroethylene, polyphenylene sulfide, polyimide, polysulfone, polyurethane, polyvinyl alcohol and acrylic resin.

[0012] Preferably, the fineness of the black talcum powder is 1000-1500 mesh.

[0013] Preferably, the weight ratio of the black talc powder to stearic acid is 100:0.5-3.

[0014] Preferably, the temperature of the modification treatment is 70 to 130°C;

[0015] The modification treatment time is 0.5 to 2 hours.

[0016] Preferably, the weight ratio of the modified black talcum powder to the plastic is 10-20:100.

[0017] Preferably, the temperature of the banburying is 130-180°C;

[0018] The mixing time is 20 to 40 minutes.

[0019] Preferably, the diameter of the granulation is 1 to 3 mm.

[0020] The invention also provides modified black talcum powder filled plastic prepared by the preparation method.

[0021] The present invention also provides the application of the modified black talcum powder filled plastic in automobile manufacturing, building materials, electronic products, medical equipment and packaging industries.

[0022] Beneficial effects of the present invention:

[0023] The invention obtains a modified black talc powder-filled plastic by modifying black talc powder and filling it into PP resin; the modified black talc powder-filled plastic provided by the invention has excellent performances such as impact strength, tensile strength, bending strength, etc., and has low cost and wide application prospects. The invention is of great significance for increasing the added value of black talc, opening up new application directions, and guiding the development of the black talc industry. DETAILED DESCRIPTION

[0024] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0025] Experimental materials used in the embodiments of the present invention:

[0026] The black talc powder sample is the main oolitic black talc powder in Guangfeng, Jiangxi Province, with a fineness of 1250 mesh (D90 of double R mode is 8.9), and the chemical composition is shown in Table 1;

[0027] Table 1 Chemical composition of black talcum powder

[0028]

[0029] General-grade PP was purchased from Maoming Petrochemical;

[0030] Stearic acid and vinyltrimethoxysilane were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0031] Sample testing was carried out at Yuyao Kezhisu Nano New Materials Technology Co., Ltd.

[0032] Example 1

[0033] 100 parts by weight of black talc powder and 1 part by weight of stearic acid were subjected to continuous shearing treatment at 100° C. for 1 hour to obtain modified black talc powder with surface hydrophobic treatment.

[0034] The modified black talcum powder was added to PP at a ratio of 15%, and put into an internal mixer. After high-temperature plasticization at 150°C for 30 minutes, it was subjected to high temperature and strong mechanical action in the internal mixer cavity, resulting in severe oxidation, and the ideal plasticity could be obtained in a relatively short time. Then it entered the granulator, melt-extruded plastic lines with a diameter of about 2mm, and pelletized after water cooling to form cylindrical plastic masterbatches with a length of about 3mm, thereby obtaining modified black talcum powder-filled PP composite plastic masterbatches.

[0035] Example 2

[0036] 100 parts by weight of black talc powder and 1 part by weight of stearic acid were subjected to continuous shearing treatment at 100° C. for 1 hour to obtain modified black talc powder with surface hydrophobic treatment.

[0037] The modified black talcum powder was added to PP at a ratio of 10%, and put into an internal mixer. After high-temperature plasticization at 150°C for 30 minutes, it was subjected to high temperature and strong mechanical action in the internal mixer cavity, resulting in severe oxidation, and the ideal plasticity could be obtained in a relatively short time. Then it entered the granulator, melt-extruded plastic lines with a diameter of about 2mm, and pelletized after water cooling to form cylindrical plastic masterbatches with a length of about 3mm, thereby obtaining modified black talcum powder-filled PP composite plastic masterbatches.

[0038] Example 3

[0039] 100 parts by weight of black talc powder and 1 part by weight of stearic acid were subjected to continuous shearing treatment at 100° C. for 1 hour to obtain modified black talc powder with surface hydrophobic treatment.

[0040] The modified black talcum powder was added to PP at a ratio of 20%, and put into an internal mixer. After high-temperature plasticization at 150°C for 30 minutes, it was subjected to high temperature and strong mechanical action in the internal mixer cavity, resulting in severe oxidation, and the ideal plasticity could be obtained in a relatively short time. Then it entered the granulator, melt-extruded plastic lines with a diameter of about 2mm, and pelletized after water cooling to form cylindrical plastic masterbatches with a length of about 3mm, thereby obtaining modified black talcum powder-filled PP composite plastic masterbatches.

[0041] Comparative Example 1

[0042] 100 parts by weight of black talc powder and 1 part by weight of silane were subjected to continuous shearing treatment at 100° C. for 1 hour to obtain modified black talc powder with surface hydrophobic treatment.

[0043] The modified black talcum powder was added to PP at a ratio of 15%, and put into an internal mixer. After high-temperature plasticization at 150°C for 30 minutes, it was subjected to high temperature and strong mechanical action in the internal mixer cavity, resulting in severe oxidation, and the ideal plasticity could be obtained in a relatively short time. Then it entered the granulator, melt-extruded plastic lines with a diameter of about 2mm, and pelletized after water cooling to form cylindrical plastic masterbatches with a length of about 3mm, thereby obtaining modified black talcum powder-filled PP composite plastic masterbatches.

[0044] Experimental example

[0045] The modified black talcum powder of Example 1 and Comparative Example 1 was added to PP in a different proportion to obtain different experimental materials, as follows:

[0046] Two modified black talc powders are added to PP in different proportions respectively, and after being fully mixed in an internal mixer, they enter a granulator to produce modified black talc powder-filled PP composite plastic masterbatch. This step obtains 10 plastic masterbatches with different proportions, namely: 10% stearic acid modified black talc powder added to PP plastic masterbatch, 15% stearic acid modified black talc powder added to PP plastic masterbatch, 20% stearic acid modified black talc powder added to PP plastic masterbatch, 10% silane modified black talc powder added to PP plastic masterbatch, 15% silane modified black talc powder added to PP plastic masterbatch, 20% silane modified black talc powder added to PP plastic masterbatch, 10% unmodified black talc powder added to PP plastic masterbatch, 15% unmodified black talc powder added to PP plastic masterbatch, 20% unmodified black talc powder added to PP plastic masterbatch, and pure PP plastic masterbatch.

[0047] The cooled plastic masterbatch is poured into the hopper of the injection molding machine. The plastic masterbatch is heated to a molten state in the injection molding machine. The molten plastic quickly fills the mold cavity under high pressure to ensure that the shape and size of the sample are consistent with the mold. The plastic in the mold is cooled to form the required long strip sample. A total of 10 groups of experimental samples were obtained.

[0048] After the plastic spline is completely cooled, remove the burrs and flash on the surface of the spline to make it look neat, and then conduct a quality inspection on the spline, including appearance observation, size measurement, physical property testing, etc. For unqualified products, rework is required. After the inspection, the cantilever impact tester, electronic universal testing machine, heat deformation temperature tester, etc. are used to conduct performance tests on the formed long strip splines, including impact strength, tensile strength, bending strength, etc. Five groups of tests are conducted on each spline to ensure the accuracy of the data.

[0049] The performance test data of plastic splines are sorted out and summarized as shown in Table 2:

[0050] Table 2 Plastic spline performance test data results

[0051]

[0052]

[0053] It can be seen from the data in Table 2 that: 1. The performance of the modified black talc plastic strips in the present invention is better than that of the corresponding unmodified black talc plastic strips; 2. The impact strength of the pure PP plastic strips is better than that of other plastic strips, but the bending strength and tensile strength are significantly worse than those of the plastic strips with added black talc; 3. The performance of the stearic acid modified black talc plastic strips is better than that of the corresponding silane modified black talc plastic strips; 4. In general, the performance of the stearic acid modified black talc (15%) plastic strips provided in Example 1 of the present invention is better than that of other plastic strips, and this product formula is recommended. As the amount of modified black talc added increases, its performance gradually decreases.

[0054] From the above examples, it can be seen that the performance index of the modified black talcum powder filled plastic provided by the present invention can meet the requirements of plastic products polypropylene (PP) extruded board (simple beam notched impact strength ≥ 6kJ / m 2 , tensile yield stress ≥ 20MPa, tensile modulus ≥ 700MPa); the modified black talcum powder in the present invention has better performance in all aspects as a filler than calcium carbonate, and its price is also better than other non-metallic fillers. It can develop the functional application of black talcum powder in plastics and promote the high-quality development of the black talcum industry.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing modified black talcum powder filled plastic, characterized in that: The following steps are involved: The black talc powder is mixed with stearic acid and subjected to modification treatment to obtain modified black talc powder; The modified black talcum powder is mixed with plastic, and the modified black talcum powder filled plastic is obtained through mixing and granulation.

2. The preparation method according to claim 1, characterized in that: The plastic is selected from one or more of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, polyamide, polycarbonate, polyoxymethylene, polyethylene terephthalate, polybutylene terephthalate, polytetrafluoroethylene, polyphenylene sulfide, polyimide, polysulfone, polyurethane, polyvinyl alcohol and acrylic resin.

3. The preparation method according to claim 1, characterized in that: The fineness of the black talcum powder is 1000-1500 meshes.

4. The preparation method according to claim 1, characterized in that: The weight ratio of the black talc powder to stearic acid is 100:0.5-3.

5. The preparation method according to claim 1, characterized in that: The temperature of the modification treatment is 70 to 130°C; The modification treatment time is 0.5 to 2 hours.

6. The preparation method according to claim 1, characterized in that: The weight ratio of the modified black talcum powder to the plastic is 10-20:

100.

7. The preparation method according to claim 1, characterized in that: The temperature of the banburying is 130-180°C; The mixing time is 20 to 40 minutes.

8. The preparation method according to claim 1, characterized in that: The diameter of the granulation is 1 to 3 mm.

9. Modified black talc filled plastic prepared by the preparation method according to any one of claims 1 to 8.

10. Application of the modified black talc-filled plastic according to claim 9 in automobile manufacturing, building materials, electronic products, medical equipment and packaging industries.

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