CN114410014A

CN114410014A - Low-odor reinforced polypropylene composite material and preparation method thereof

Info

Publication number: CN114410014A
Application number: CN202210080245.4A
Authority: CN
Inventors: 陈智勤; 王灿耀
Original assignee: Guangdong Aldex New Material Co Ltd
Current assignee: Guangdong Aldex New Material Co Ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-04-29
Anticipated expiration: 2042-01-24
Also published as: CN114410014B

Abstract

The invention relates to a low-odor reinforced polypropylene composite material and a preparation method thereof. The low-odor reinforced polypropylene composite material is prepared from the following raw materials in parts by weight: 70-95 parts of polypropylene, 5-30 parts of porous carbon-coated tellurium nanowires, 0.5-3.5 parts of multi-wall carbon nanotubes, 0.1-0.5 part of antioxidant and 0.1-0.5 part of lubricant; wherein the total weight of the polypropylene and the porous carbon-coated tellurium nanowires is 100 parts. The low-odor reinforced polypropylene composite material has the advantages of high strength mechanical property and low odor, and can be applied to the fields of automobiles, aviation, electronics and electrical, household appliances and the like.

Description

Low-odor reinforced polypropylene composite material and preparation method thereof

Technical Field

The invention relates to the field of high polymer materials, in particular to a low-odor reinforced polypropylene composite material and a preparation method thereof.

Background

Polypropylene resin (i.e., PP) has excellent properties, low density, and low price, and has been developed as the second most common plastic except polyethylene. In order to realize light weight and low energy consumption of automobiles, the consumption of plastics on automobiles is more and more, wherein the consumption of polypropylene composite materials accounts for more than one third of the consumption of the plastics of the automobiles. In the automobile industry, PP composite materials are used for preparing internal and external ornaments such as instrument panels, stand columns, steering wheels, bumpers and the like, and are also used for preparing supports such as air conditioner supports, instrument panel supports and the like, so that higher requirements are put forward on the mechanical properties of the PP composite materials. The modification of the filling glass fiber is one of the common polypropylene reinforcing methods, but the compatibility of the glass fiber and polypropylene is poor, and effective interface bonding can be obtained only by adding a compatilizer, so that excellent performance is obtained.

The most commonly used compatibilizing agent at present is maleic anhydride grafted polypropylene, but the maleic anhydride remaining during synthesis, degraded during processing modification and in use, volatilizes into the air causing an intolerable taste. With the improvement of life concept, people have higher and higher requirements on automobiles. The glass fiber reinforced PP composite material is used as a main material of automotive upholstery, and the odor of the glass fiber reinforced PP composite material has great influence on the odor in a vehicle. If the smell in the car is large, the car using experience of consumers is seriously influenced, and the health of passengers in the car is also adversely influenced, but the mechanical property and the smell of the glass fiber reinforced PP composite material are difficult to meet the requirements at the same time. Therefore, the development of polypropylene composites having high strength and low odor is urgently required.

Disclosure of Invention

Based on the above, the invention provides a low-odor reinforced polypropylene composite material, which has excellent mechanical properties, does not have the unpleasant odor of a glass fiber reinforced polypropylene composite material, and can meet the requirements of the automobile industry.

The invention comprises the following technical scheme.

The low-odor reinforced polypropylene composite material is prepared from the following raw materials in parts by weight:

wherein the total weight of the polypropylene and the porous carbon-coated tellurium nanowires is 100 parts.

In some embodiments, the low-odor reinforced polypropylene composite material is prepared from the following raw materials in parts by weight:

In some embodiments, the mass ratio of the porous carbon-coated tellurium nanowires to the multi-wall carbon nanotubes is 8-12: 1.

In some of these embodiments, the mass ratio of porous carbon to tellurium nanowires in the porous carbon-wrapped tellurium nanowires is 28-32: 1.

in some of the embodiments, the porous carbon-wrapped tellurium nanowires have a diameter of 3 to 30 nanometers, a length of greater than 30 micrometers, and an aspect ratio of greater than 10000.

In some embodiments, the preparation method of the porous carbon-coated tellurium nanowire comprises the following steps:

(1) strongly stirring polyvinylpyrrolidone and sodium tellurite in water until the polyvinylpyrrolidone and the sodium tellurite are completely dissolved to obtain a sodium tellurite aqueous solution, adding hydrazine hydrate and an ammonia water solution into the sodium tellurite aqueous solution, then keeping the obtained mixed solution in a sealed reaction kettle at the temperature of 170-190 ℃ for 2-4 hours, cooling, filtering, washing with water, and drying to obtain a tellurium nanowire;

(2) and dispersing the tellurium nanowires and glucose in water, then keeping the mixture in a sealed reaction kettle at the temperature of between 150 and 170 ℃ for 2 to 4 hours, cooling, filtering, washing with water, and drying to obtain the porous carbon-coated tellurium nanowires.

(1) strongly stirring polyvinylpyrrolidone and sodium tellurite in water until the polyvinylpyrrolidone and the sodium tellurite are completely dissolved to obtain a sodium tellurite aqueous solution, adding hydrazine hydrate and an ammonia water solution into the sodium tellurite aqueous solution, then keeping the obtained mixed solution in a sealed reaction kettle at the temperature of 175-185 ℃ for 2.5-3.5 hours, cooling, filtering, washing with water, and drying to obtain tellurium nanowires;

(2) and dispersing the tellurium nanowires and glucose in water, then keeping the mixture in a sealed reaction kettle at the temperature of 155-165 ℃ for 2.5-3.5 hours, cooling, filtering, washing with water, and drying to obtain the porous carbon-coated tellurium nanowires.

In some embodiments, the concentration of sodium tellurite in the aqueous solution of sodium tellurite is 2mg to 3mg/mL, and the concentration of polyvinylpyrrolidone is 0.8g to 1.2 g/mL.

In some embodiments, the mass concentration of the hydrazine hydrate is 80-90%, and the mass concentration of the ammonia water solution is 25-28%; the volume ratio of the sodium tellurite aqueous solution to the hydrazine hydrate to the ammonia aqueous solution is 1:0.04-0.05: 0.08-0.12.

In some embodiments, the mass ratio of the tellurium nanowires to the glucose in step (2) is 1: 28-32.

In some embodiments, the ratio of the tellurium nanowires to the water in the step (2) is 1 g: 450 and 500 mL.

In some of these embodiments, the multi-wall carbon nanotubes have a diameter of 5 to 15 nanometers and a length of 0.5 to 2 micrometers.

In some of these embodiments, the polypropylene is one of a co-polypropylene, a homo-polypropylene, or a mixture thereof.

In some of these embodiments, the antioxidant is at least one of antioxidant 1010, antioxidant 168, and antioxidant DLTP.

In some embodiments, the antioxidant is a mixture of 1: 0.8-1.2 of antioxidant 1010 and antioxidant 168.

In some of these embodiments, the lubricant is one or a mixture of zinc stearate and calcium stearate.

The invention also provides a preparation method of the low-odor reinforced polypropylene composite material. The technical scheme is as follows.

The preparation method of the low-odor reinforced polypropylene composite material comprises the following steps:

(1) weighing the polypropylene, the porous carbon-coated tellurium nanowire, the multi-wall carbon nanotube, the antioxidant and the lubricant in parts by weight, and fully mixing to obtain a uniformly mixed mixture;

(2) and feeding the mixture into a double-screw extruder, and carrying out melting, extrusion and granulation to obtain the low-odor reinforced polypropylene composite material.

In some of these embodiments, the process parameters of the twin screw extruder include: the temperature is 180-220 ℃, the screw rotating speed is 450-650 rpm, and the vacuum degree is more than 0.06 MPa.

In some of these embodiments, the process parameters of the twin screw extruder include: the temperature is 180-190 ℃, the screw rotating speed is 500-550 rpm, and the vacuum degree is more than 0.06 MPa.

The principle of the low-odor reinforced polypropylene composite material is as follows:

the porous carbon-coated tellurium nanowires (particularly porous carbon-coated tellurium nanowires with the diameter of 3-30 nanometers, the length of more than 30 micrometers and the length-diameter ratio of more than 10000) added in the invention enable the nanowires to form a stable three-dimensional network structure in polypropylene resin, thereby effectively enhancing the mechanical property of the polypropylene resin; the porous carbon wrapped outside the tellurium nanowires can improve the interface compatibility of the three-dimensional network structure of the nanowires and polypropylene resin, so that the three-dimensional network structure is better dispersed in the polypropylene resin and is more firmly combined, and the reinforcing effect is stronger. Meanwhile, the porous carbon wrapped outside the tellurium nanowires can effectively adsorb odor generated in the modification process of the polypropylene composite material.

The added multi-wall carbon nano-tube (preferably the multi-wall carbon nano-tube with the diameter of 5-15 nanometers and the length of 0.5-2 micrometers) can be combined with the surface of the tellurium nano-wire wrapped by porous carbon at different angles to form small branches, so that the three-dimensional network structure of the nano-wire is combined with polypropylene resin more firmly, and the reinforcing effect of the three-dimensional network structure is further enhanced. Meanwhile, the multi-wall carbon nano tube can also effectively adsorb odor generated in the modification process of the polypropylene composite material. According to the invention, the mechanical property of the polypropylene resin is effectively enhanced and the odor of the polypropylene resin is reduced by virtue of the three-dimensional network structure formed by wrapping the tellurium nanowires and the multi-wall carbon nanotubes with the porous carbon, so that the high-strength low-odor polypropylene composite material is prepared.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the porous carbon-coated tellurium nanowire (especially the porous carbon-coated tellurium nanowire with the length-diameter ratio of more than 10000) and the multi-wall carbon nanotube are added, so that the mechanical property of the polypropylene composite material is effectively improved, and the industrial requirement is met. Meanwhile, the porous carbon and the multi-wall carbon nanotube can effectively adsorb odor molecules, so that the odor is further reduced, and the low-odor reinforced polypropylene composite material is obtained. The composite material has high mechanical property and strength and low smell, and can be applied to the fields of automobiles, aviation, electronics and electrics, household appliances and the like.

The preparation method of the low-odor reinforced polypropylene composite material provided by the invention has the advantages of simple process, easiness in control and low requirement on equipment, and the used equipment is general polymer processing equipment, so that the cost is low, and the industrial production is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a low-odor reinforced polypropylene composite material according to an embodiment of the present invention, in which a background represents polypropylene resin, a long curve represents porous carbon-coated tellurium nanowires, and a short curve represents multi-wall carbon nanotubes.

Fig. 2 is a full-scale SEM photograph of the porous carbon-coated tellurium nanowires.

Fig. 3 is a TEM photograph of porous carbon-coated tellurium nanowires.

Detailed Description

In order that the invention may be more readily understood, reference will now be made to the following more particular description of the invention, examples of which are set forth below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

Unless otherwise defined, all terms used in the specification of the present invention are used only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

The terms "comprises" and "comprising," and any variations thereof, of embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.

The "plurality" referred to in the present invention means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

The structure schematic diagram of the low-odor reinforced polypropylene composite material of one embodiment of the invention is shown in fig. 1, wherein the background represents polypropylene resin, the long curve represents porous carbon-coated tellurium nanowires, and the short curve represents multi-wall carbon nanotubes. As shown in a structural schematic diagram, the tellurium nanowires wrapped by the porous carbon with high length-diameter ratio form a three-dimensional network structure in the polypropylene resin, so that the mechanical property of the polypropylene resin is improved. The porous carbon wrapped outside the tellurium nanowires can improve the interface compatibility of the tellurium nanowires and polypropylene resin, so that the tellurium nanowires are better dispersed in the polypropylene resin and are more firmly combined, and the enhancement effect is stronger. The multi-wall carbon nano tube can be combined with the surface of the porous carbon-coated tellurium nano wire at different angles to form small branches, so that the three-dimensional net structure of the nano wire is combined with the polypropylene resin more firmly, and the reinforcing effect of the three-dimensional net structure is further enhanced. Meanwhile, the porous carbon and the multi-wall carbon nano tube can effectively adsorb odor generated in the modification process of the polypropylene composite material. According to the invention, the polypropylene composite material with high strength and low odor is prepared by means of the synergistic effect of the tellurium nanowire wrapped by the porous carbon and the multi-wall carbon nanotube.

The raw materials used in the examples and comparative examples of the present invention were as follows:

the polypropylene is copolymerized polypropylene PP-EP548R selected from China petrochemical industry marketing limited company.

The porous carbon-coated tellurium nanowire is prepared by the following steps:

(1) 1g of polyvinylpyrrolidone (PVP) and 0.089 g of sodium tellurite are intensively stirred in 35mL of ultrapure water at room temperature until the materials are completely dissolved, 1.65mL of hydrazine hydrate (with the mass concentration of 85%) and 3.55mL of ammonia water solution (with the mass concentration of 25-28%) are added, the mixture is transferred to a stainless steel reaction kettle with a polytetrafluoroethylene lining, the reaction kettle is sealed, kept at 180 ℃ for 3 hours, naturally cooled to room temperature, filtered, washed by the ultrapure water, and naturally dried to obtain 0.05g of tellurium nanowires.

(2) 0.05g of tellurium nanowires and 1.5g of glucose are dispersed in 24mL of ultrapure water, transferred into a stainless steel reaction kettle with a polytetrafluoroethylene lining, sealed, kept at 160 ℃ for 3 hours, naturally cooled to room temperature, filtered, washed by ultrapure water, naturally dried, and wrapped by porous carbon to obtain 1.5g of tellurium nanowires. The SEM photograph is shown in FIG. 2, the TEM photograph is shown in FIG. 3, and it can be known from FIG. 2 and FIG. 3 that the prepared porous carbon-coated tellurium nanowire has a diameter of 3-30 nm, a length of more than 30 μm, and an aspect ratio of more than 10000.

Obtaining the mass ratio of the tellurium nanowire to the porous carbon in the porous carbon-coated tellurium nanowire by a calcination method, wherein the mass ratio is 1: 30, of a nitrogen-containing gas; the specific method comprises the following steps: and (3) taking 1.5g of porous carbon to wrap the tellurium nanowires, putting the porous carbon wrapped tellurium nanowires into a 600 ℃ muffle furnace to calcine for 30min in an air environment, weighing the tellurium nanowires to obtain the mass of the tellurium nanowires, wherein the mass of the residues, which is reduced compared with the mass of the porous carbon wrapped tellurium nanowires, is the mass of the porous carbon, and the mass ratio of the residues to the porous carbon can be obtained.

Wherein the raw materials for synthesizing the porous carbon-coated tellurium nanowire are as follows: PVP, sodium tellurite, hydrazine hydrate, ammonia water and glucose are all selected from the group of national medicine.

The multi-wall carbon nano-tube has the diameter of 5-15 nanometers and the length of 0.5-2 micrometers, and is selected from Nanjing Xiancheng nanometer material science and technology Limited company.

Antioxidant 1010, antioxidant 168 selected from basf; in the following examples and comparative examples, the antioxidant used was prepared by mixing, by mass, 1: 1 antioxidant 1010 and antioxidant 168.

The lubricant is zinc stearate selected from the group consisting of Xinwei auxiliary agents of high-density.

The tellurium nanowires used in the comparative examples were prepared by the following steps:

1g of polyvinylpyrrolidone (PVP) and 0.089 g of sodium tellurite are intensively stirred in 35mL of ultrapure water at room temperature until the mixture is completely dissolved, 1.65mL of hydrazine hydrate (with the mass concentration of 85%) and 3.55mL of ammonia water solution are added, the mixture is transferred to a stainless steel reaction kettle with a polytetrafluoroethylene lining, the reaction kettle is sealed and kept at 180 ℃ for 3 hours, and the reaction kettle is naturally cooled to room temperature, filtered, washed by the ultrapure water and naturally dried to obtain the tellurium nanowires.

The porous carbon used in the comparative example has a specific surface area of more than 800m²/g-1200m²(ii)/g, selected from Cabot corporation, USA.

It is understood that the above raw material reagents are only examples of some specific embodiments of the present invention, so as to make the technical scheme of the present invention more clear, and do not represent that the present invention can only adopt the above reagents, particularly, the scope of the claims is subject to. In addition, "parts" described in examples and comparative examples mean parts by weight unless otherwise specified.

Example 1

The embodiment provides a low-odor reinforced polypropylene composite material, which is prepared from the following raw materials in parts by weight:

(2) feeding the mixture into a double-screw extruder, and carrying out melting, extrusion and granulation to obtain the low-odor reinforced polypropylene composite material;

wherein the technological parameters of the double-screw extruder comprise: the temperature is 180 ℃, the screw rotation speed is 550rpm, and the vacuum degree is more than 0.06 MPa.

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

wherein the technological parameters of the double-screw extruder comprise: the temperature is 220 ℃, the screw rotation speed is 550rpm, and the vacuum degree is more than 0.06 MPa.

Comparative example 1

The comparative example provides a polypropylene composite material, which is prepared from the following raw materials in parts by weight:

100 parts of polypropylene, namely 100 parts of polypropylene,

0.1 part of an antioxidant, namely,

0.1 part of lubricant.

The preparation method of the polypropylene composite material comprises the following steps:

(1) weighing the polypropylene, the antioxidant and the lubricant according to the weight parts, and fully mixing to obtain a uniformly mixed mixture;

(2) feeding the mixture into a double-screw extruder, and carrying out melting, extrusion and granulation to obtain the polypropylene composite material;

Comparative example 2

wherein the total weight of the polypropylene and the porous carbon is 100 parts.

(1) weighing the polypropylene, the porous carbon, the multi-wall carbon nano tube, the antioxidant and the lubricant according to the weight parts, and fully mixing to obtain a uniformly mixed mixture;

Comparative example 3

The embodiment provides a polypropylene composite material, which is prepared from the following raw materials in parts by weight:

wherein the total weight of the polypropylene and the tellurium nanowires is 100 parts.

(1) weighing the polypropylene, the tellurium nanowires, the multi-wall carbon nano tubes, the antioxidant and the lubricant according to the weight parts, and fully mixing to obtain a uniformly mixed mixture;

Comparative example 4

wherein the total weight of the polypropylene, tellurium nanowires and porous carbon is 100 parts.

(1) weighing the polypropylene, the tellurium nanowires, the porous carbon, the multi-wall carbon nano tube, the antioxidant and the lubricant according to the weight parts, and fully mixing to obtain a uniformly mixed mixture;

Comparative example 5

(1) weighing the polypropylene, the porous carbon-coated tellurium nanowire, the antioxidant and the lubricant in parts by weight, and fully mixing to obtain a uniformly mixed mixture;

The following is a list of raw material compositions of examples and comparative examples (table 1).

TABLE 1 summary of the composition parts by weight of the raw materials of the examples and comparative examples

Remarking: a, temperature change of the parallel twin-screw extruder.

The polypropylene composites prepared in the above examples and comparative examples were subjected to the following performance tests:

tensile property: testing according to GB/T1040-2006 standard, wherein the stretching speed is 50 mm/min;

bending strength: testing according to GB/T9341-;

and (3) odor test: the evaluation method is as follows according to Q/BYDQ-A1901.404 standard test: 20g of the particles were placed in a 1L scent bottle, sealed, the bottle was placed in an oven at 80 ℃ for 2h, and the professional tested for odor rating, the specific odor rating scale being shown in Table 2.

Density: the test is carried out according to the method A in GB/T1033.1, the test temperature is 23 ℃, the surface of the sample is smooth and has no recess, and the mass of the sample is more than 1 g.

The results of the performance tests are shown in table 3.

Table 2 odor rating tabulation

Grade	Description of odor classes
		1	Has no peculiar smell
2	Slight smell
		3	Has good taste but no irritation
4	Has little pungent smell
		5	Has strong pungent odor

TABLE 3 Properties of Polypropylene composite for the examples and comparative examples

Embodiments 1 to 7 are directed to adjusting the addition amounts of a porous carbon-coated tellurium nanowire and a multi-wall carbon nanotube, and it can be seen from the table that as the addition amounts of the porous carbon-coated tellurium nanowire and the multi-wall carbon nanotube increase, the tensile strength, the bending strength, and the bending modulus of the obtained polypropylene composite material show an increasing trend of change, and the odor grade shows a decreasing trend of change, mainly because the length-diameter ratio of the porous carbon-coated tellurium nanowire is greater than 10000, a stable three-dimensional network structure is formed in the polypropylene resin, thereby effectively enhancing the mechanical properties of the polypropylene resin, and as the addition amount of the porous carbon-coated tellurium nanowire and the multi-wall carbon nanotube increase, the three-dimensional network structure is more stable, and the mechanical strength of the polypropylene composite material is higher. And with the increase of the addition amount of the tellurium nanowire and the multi-wall carbon nanotube wrapped by the porous carbon, the mass content of the porous carbon and the multi-wall carbon nanotube is also improved, more odor molecules can be adsorbed, and the polypropylene composite material has smaller odor and lower odor grade. However, when the addition amount of the tellurium nanowire and the multi-wall carbon nanotube coated by the porous carbon is too high, the density of the obtained polypropylene composite material is too high, the product is heavier, and the preparation cost of the material is increased.

Example 7 compared with example 8, the temperature of the parallel twin-screw extruder of example 8 is 220 ℃, the temperature of the parallel twin-screw extruder of example 7 is 180 ℃, and by comparison, the mechanical strength of the polypropylene composite material prepared by adopting the temperature of the parallel twin-screw extruder described in example 7 is equivalent to that of example 8, and the smell is lower.

Compared with the comparative example 1, the polypropylene composite material prepared in the comparative example 1 has low mechanical strength and high odor grade because the porous carbon coated tellurium nanowires with the length-diameter ratio being more than 10000 are lacked to form a stable three-dimensional network structure in the polypropylene resin and the porous carbon coated tellurium nanowires and multi-wall carbon nanotubes coated tellurium nanowires are not used to adsorb odor molecules, because the porous carbon coated tellurium nanowires with the length-diameter ratio being more than 10000 are not added in the comparative example 1; example 2 compared with comparative example 2, the porous carbon used in comparative example 2 to replace the porous carbon coated tellurium nanowires in example 2 results in that the mechanical properties of the polypropylene composite material prepared in comparative example 2 are far lower than those of example 2, and the odor grade is equivalent to that of example 2, mainly because comparative example 2 lacks tellurium nanowires with the length-diameter ratio of more than 10000 to form a three-dimensional network structure, and the length-diameter ratio of multi-wall carbon nanotubes is small, a large-area and stable structure cannot be formed, but because the multi-wall carbon nanotubes and the porous carbon are added, odor molecules are effectively absorbed, and the odor grade is equivalent to that of example 2; compared with the comparative example 3, the comparative example 3 has the advantages that the tellurium nanowires replace the porous carbon-coated tellurium nanowires in the example 2, so that the mechanical strength of the polypropylene composite material in the comparative example 3 is lower than that in the example 2, and the odor grade is improved, mainly because the tellurium nanowires which are not coated by porous carbon have poor interface compatibility with polypropylene in polypropylene resin, the tellurium nanowires cannot be well dispersed in the polypropylene resin, the formed three-dimensional network structure cannot be well combined with the polypropylene resin, the reinforcing effect is weakened, and the porous carbon which is not coated by the tellurium nanowires adsorbs odor molecules, so that the odor grade is improved; compared with the comparative example 4, in the example 2, although the porous carbon, the tellurium nanowire and the carbon nanotube are added in the comparative example 4, the porous carbon is not wrapped outside the tellurium nanowire, the interface compatibility between the tellurium nanowire and the polypropylene cannot be improved, and only the function of the odor adsorbent is exerted, so that the mechanical property enhancement effect is weak, and the mechanical property of the polypropylene composite material prepared in the comparative example 4 is lower than that of the polypropylene composite material prepared in the example 2; compared with the comparative example 5, the comparative example 5 is added with the porous carbon-coated tellurium nanowire and is not added with the multi-wall carbon nanotube, so that the mechanical property and the smell property are weaker than those of the example 2, mainly because the multi-wall carbon nanotube has the diameter of 5-15 nanometers and the length of 0.5-2 micrometers, and can be combined with the surface of the porous carbon-coated tellurium nanowire at different angles to form small branches, so that the three-dimensional network structure of the nanowire is combined with the polypropylene resin more firmly, the reinforcing effect of the three-dimensional network structure is further enhanced, and meanwhile, the multi-wall carbon nanotube can also effectively absorb the smell generated in the modification process of the polypropylene composite material.

In conclusion, the tellurium nanowires with the length-diameter ratio of more than 10000 form a stable three-dimensional network structure in the polypropylene resin, so that the mechanical strength of the polypropylene composite material is improved; the porous carbon can effectively adsorb odor molecules, reduce odor grade, wrap the porous carbon outside the tellurium nanowires, and increase the interface compatibility of the tellurium nanowires and polypropylene resin, so that the tellurium nanowires are better dispersed and more stably combined, and the enhancement effect is improved; the combination of the carbon nano tube and the porous carbon wrapped on the tellurium nano wire has a synergistic enhancement effect, and the enhancement effect can be further enhanced, so that the obtained polypropylene composite material has better mechanical strength and lower odor grade.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The low-odor reinforced polypropylene composite material is characterized by being prepared from the following raw materials in parts by weight:

2. The low-odor reinforced polypropylene composite material according to claim 1, which is prepared from the following raw materials in parts by weight:

3. The low-odor reinforced polypropylene composite material according to claim 2, which is prepared from the following raw materials in parts by weight:

4. The low-odor reinforced polypropylene composite material as claimed in claim 1, wherein the mass ratio of the porous carbon-coated tellurium nanowires to the multi-wall carbon nanotubes is 8-12: 1.

5. The low-odor reinforced polypropylene composite material according to claim 1, wherein the mass ratio of porous carbon to tellurium nanowires in the porous carbon-coated tellurium nanowires is 28-32: 1; and/or the presence of a gas in the gas,

the diameter of the porous carbon-coated tellurium nanowire is 3-30 nanometers, the length of the porous carbon-coated tellurium nanowire is greater than 30 micrometers, and the length-diameter ratio of the porous carbon-coated tellurium nanowire is greater than 10000.

6. The low-odor reinforced polypropylene composite according to any one of claims 1 to 5, wherein the preparation method of the porous carbon-coated tellurium nanowires comprises the following steps:

7. The low-odor reinforced polypropylene composite material as claimed in claim 6, wherein the concentration of sodium tellurite in the sodium tellurite aqueous solution is 2mg-3mg/mL, and the concentration of polyvinylpyrrolidone is 0.8g-1.2 g/mL; and/or the presence of a gas in the gas,

the mass concentration of the hydrazine hydrate is 80-90%, the mass concentration of the ammonia water solution is 25-28%, and the volume ratio of the sodium tellurite aqueous solution to the hydrazine hydrate to the ammonia water solution is 1:0.04-0.05: 0.08-0.12; and/or the presence of a gas in the gas,

in the step (2), the mass ratio of the tellurium nanowires to the glucose is 1: 28-32; and/or the presence of a gas in the gas,

in the step (2), the ratio of the tellurium nanowires to the water is 1 g: 450 and 500 mL.

8. The low-odor reinforced polypropylene composite of any one of claims 1 to 5, wherein the multi-wall carbon nanotubes have a diameter of 5 to 15 nanometers and a length of 0.5 to 2 microns; and/or the presence of a gas in the gas,

the polypropylene is one or a mixture of copolymerized polypropylene and homopolymerized polypropylene; and/or the presence of a gas in the gas,

the antioxidant is at least one of antioxidant 1010, antioxidant 168 and antioxidant DLTP; and/or the presence of a gas in the gas,

the lubricant is one or a mixture of zinc stearate and calcium stearate.

9. A method for preparing the low odor reinforced polypropylene composite of any one of claims 1 to 8, comprising the steps of:

10. The method for preparing as claimed in claim 9, wherein the process parameters of the twin-screw extruder comprise: the temperature is 180-220 ℃, the screw rotating speed is 450-650 rpm, and the vacuum degree is more than 0.06 MPa.