Modified black mica powder filled plastic and its preparation method and application

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of plastic material modification technology, and in particular to a modified black talc-filled plastic, its preparation method, and its application. Background Technology

[0002] Plastic modification technology refers to the modification 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, thereby meeting the application requirements under specific environmental conditions. This technology runs through the entire process from raw material resin production to the development of diverse 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 rubber and plastics processing. Due to their wide availability, low cost, diverse varieties and specifications, large filler volumes, and customizable colorability, inorganic powder fillers have become the second most important material in plastics processing, second only to matrix materials. However, inorganic fillers also have some inherent drawbacks. For example, their inertness and hydrophilicity lead to poor compatibility with hydrophobic matrix resins and weak bonding forces, which can adversely affect the physical and mechanical properties of composite materials. Furthermore, some inorganic powders also exhibit disadvantages such as insufficient reinforcing properties, easy agglomeration, poor dispersibility, low crosslinking properties, and relatively high prices.

[0004] Chinese patent CN104725701A discloses a far-infrared negative ion powder-filled modified plastic, which is made from the following raw materials in parts by weight: 30-40 parts polystyrene resin, 55-65 parts polyethylene, 3.8-6.1 parts nano-tin antimony oxide, 0.8-1.2 parts nano-titanium dioxide, 0.4-0.6 parts ethylenediethylenetriamine, 0.1-0.3 parts sodium bisulfite, 1-3 parts far-infrared negative ion powder, 2-4 parts epoxidized soybean oil, 0.6-0.8 parts antioxidant 168, 0.5-0.7 parts aniline methyltrimethoxysilane, 0.6-0.9 parts dimethylthiotoluene diamine, and an appropriate amount of anhydrous ethanol. In this invention, the nanomaterials are first added to a coupling agent and stirred to activate them, and then mixed evenly with polystyrene resin, polyethylene, antioxidant 168, far-infrared negative ion powder, etc. Then, the mixture is melt-extruded and granulated by a twin-screw extruder. The resulting plastic is antioxidant and corrosion resistant, and can release negative oxygen ions and emit far-infrared rays.

[0005] However, the materials used in the aforementioned existing technologies are complex, costly, and have limited mechanical properties. Summary of the Invention

[0006] The purpose of this invention is to provide a modified black talc-filled plastic, its preparation method, and its application, which has superior mechanical properties.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0008] This invention provides a method for preparing modified black talc-filled plastics, comprising the following steps:

[0009] Black talc powder is mixed with stearic acid and modified to obtain modified black talc powder.

[0010] Modified black talc powder is mixed with plastic, and then mixed and granulated to obtain modified black talc powder filled plastic.

[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 talc powder is 1000-1500 mesh.

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

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

[0015] The modification treatment takes 0.5 to 2 hours.

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

[0017] Preferably, the mixing temperature 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 present invention also provides a modified black talc powder filled plastic prepared by the above preparation method.

[0021] The present invention also provides applications of the above-mentioned modified black talc-filled plastics in the automotive manufacturing, building materials, electronics, medical devices and packaging industries.

[0022] The beneficial effects of this invention are:

[0023] This invention modifies black talc powder and fills it into PP resin to obtain a modified black talc-filled plastic. The modified black talc-filled plastic provided by this invention exhibits excellent impact strength, tensile strength, and flexural strength, and is relatively low in cost, showing broad application prospects. This invention is of great significance for increasing the added value of black talc, exploring new application directions, and guiding the development of the black talc industry. Detailed Implementation

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

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

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

[0027] Table 1 Chemical Composition of Black Talc Powder

[0028]

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

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

[0031] Sample testing was conducted at Yuyao Kezhisu Nanomaterials 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 hydrophobic surface treatment.

[0034] Modified black talc powder was added to PP at a ratio of 15%, fed into an internal mixer, and plasticized at 150°C for 30 minutes. Under the high temperature and strong mechanical action in the internal mixer chamber, it underwent intense oxidation, which enabled it to obtain ideal plasticity in a short time. Then it was fed into a granulator and melt-extruded into plastic lines with a diameter of about 2 mm. After water cooling, it was granulated to form cylindrical plastic masterbatch with a length of about 3 mm, thus obtaining modified black talc powder filled PP composite plastic masterbatch.

[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 hydrophobic surface treatment.

[0037] Modified black talc powder is added to PP at a ratio of 10%, fed into an internal mixer, and plasticized at 150°C for 30 minutes. Under the high temperature and strong mechanical action in the internal mixer chamber, it undergoes intense oxidation, which can achieve ideal plasticity in a short time. Then it enters a granulator and melt-extrudes plastic lines with a diameter of about 2mm. After water cooling, it is granulated to form cylindrical plastic masterbatch with a length of about 3mm, thus obtaining modified black talc powder filled PP composite plastic masterbatch.

[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 hydrophobic surface treatment.

[0040] Modified black talc powder was added to PP at a ratio of 20%, and fed into an internal mixer. After being plasticized at 150°C for 30 minutes, the mixture underwent intense oxidation due to high temperature and strong mechanical action within the mixer chamber, achieving ideal plasticity in a short time. The mixture was then fed into a granulator, where it was melt-extruded into plastic lines with a diameter of about 2 mm. After water cooling, the plastic was granulated to form cylindrical plastic masterbatches with a length of about 3 mm, thus obtaining modified black talc powder-filled PP composite plastic masterbatch.

[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 hydrophobic surface treatment.

[0043] Modified black talc powder was added to PP at a ratio of 15%, fed into an internal mixer, and plasticized at 150°C for 30 minutes. Under the high temperature and strong mechanical action in the internal mixer chamber, it underwent intense oxidation, which enabled it to obtain ideal plasticity in a short time. Then it was fed into a granulator and melt-extruded into plastic lines with a diameter of about 2 mm. After water cooling, it was granulated to form cylindrical plastic masterbatch with a length of about 3 mm, thus obtaining modified black talc powder filled PP composite plastic masterbatch.

[0044] Experimental Example

[0045] Based on the modified black talc powder of Example 1 and Comparative Example 1, the addition ratio when mixed with PP was changed to obtain different experimental materials, as detailed below:

[0046] Two types of modified black talc powder were added to PP in different proportions. After thorough mixing in an internal mixer, the mixture was fed into a granulator to produce modified black talc powder-filled PP composite plastic masterbatch. This step yielded 10 different plastic masterbatches with varying proportions: 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 was poured into the hopper of the injection molding machine. Inside the machine, the masterbatch was heated to a molten state. The molten plastic rapidly filled the mold cavity under high pressure, ensuring that the shape and size of the sample were consistent with the mold. After cooling, the plastic in the mold formed the desired elongated sample. A total of 10 sets of experimental samples were obtained.

[0048] After the plastic strips have completely cooled, remove the burrs and flash from the surface of the strips to make them look neat. Then, perform quality inspections on the strips, including visual observation, dimensional measurement, and physical property testing. For defective products, rework is required. After inspection, use a cantilever impact testing machine, electronic universal testing machine, and heat distortion temperature tester to perform performance tests on the formed long strips, including impact strength, tensile strength, and flexural strength. Five sets of tests are performed on each type of strip to ensure the accuracy of the data.

[0049] The performance test data of the plastic samples are compiled and summarized in Table 2:

[0050] Table 2 Results of Performance Tests on Plastic Strips

[0051]

[0052]

[0053] The data in Table 2 show that: 1. The performance of the modified black talc plastic sample in this invention is better than that of the corresponding unmodified black talc plastic sample; 2. The impact strength of the pure PP plastic sample is better than that of other plastic samples, but its flexural strength and tensile strength are significantly worse than those of the plastic sample with added black talc; 3. The performance of the stearic acid modified black talc plastic sample is better than that of the corresponding silane modified black talc plastic sample; 4. Overall, the stearic acid modified black talc (15%) plastic sample provided in Example 1 of this invention has better performance than other plastic samples, and this product formulation is recommended. As the amount of modified black talc added increases, its performance gradually decreases.

[0054] As can be seen from the above embodiments, the performance indicators of the modified black talc-filled plastic provided by the present invention can meet the requirements of polypropylene (PP) extruded sheets (notched impact strength of simply supported beam ≥6kJ / m). 2 The modified black talc powder in this invention has superior performance in all aspects compared to calcium carbonate, and its price is also better than other non-metallic fillers. It can expand the functional application of black talc powder in plastics and promote the high-quality development of the black talc industry.

[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a modified black talc-filled plastic, characterized in that, Includes the following steps: Black talc powder is mixed with stearic acid and modified to obtain modified black talc powder. Modified black talc powder is mixed with plastic, and then mixed and granulated to obtain modified black talc powder filled plastic. The modified black talc powder is mixed with plastic at a weight ratio of 15:

100. The fineness of the black talc powder is 1000~1500 mesh; The weight ratio of the black talc powder to stearic acid is 100:0.5~3; The temperature for the modification treatment is 70~130℃; The modification treatment takes 0.5 to 2 hours; The mixing temperature is 130~180℃; The mixing time is 20-40 minutes; The plastic is polypropylene.

2. The preparation method according to claim 1, characterized in that, The diameter of the granules is 1~3mm.

3. Modified black talc-filled plastic prepared by the preparation method according to any one of claims 1 to 2.

4. The application of the modified black talc-filled plastic according to claim 3 in the automotive manufacturing, building materials, electronics, medical devices and packaging industries.

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