CN111057339A - Low-odor low-VOC polypropylene composite material and preparation method thereof - Google Patents

Low-odor low-VOC polypropylene composite material and preparation method thereof Download PDF

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CN111057339A
CN111057339A CN201911400780.8A CN201911400780A CN111057339A CN 111057339 A CN111057339 A CN 111057339A CN 201911400780 A CN201911400780 A CN 201911400780A CN 111057339 A CN111057339 A CN 111057339A
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low
odor
accurel
water
polypropylene composite
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CN111057339B (en
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范木良
杨杰
安峰
申应军
李凡
王辉
赵海波
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Jinyoung Xiamen Advanced Materials Technology Co Ltd
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K2201/005Additives being defined by their particle size in general
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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Abstract

The invention discloses a low-odor low-VOC polypropylene composite material and a preparation method thereof. The composition comprises the following components: 69.7-73 wt% of polypropylene, 25 wt% of talcum powder, 1-4 wt% of Accurel XP100-60 water-absorbing master batch, 0.4 wt% of antioxidant, 0.3 wt% of lubricant, 0.2 wt% of light stabilizer and 0.1-0.4 wt% of metal deactivator; the Accurel XP100-60 water-absorbing master batch is formed by performing water absorption treatment on an Accurel XP100-60 plastic foaming carrier. The prepared low-odor low-VOC polypropylene composite material has excellent odor grade (the odor grade is less than 3) and low total carbon emission (the total carbon emission is less than or equal to 30 ug/g). Meanwhile, the method has the characteristics of no need of modification of production and processing equipment and simple preparation process.

Description

Low-odor low-VOC polypropylene composite material and preparation method thereof
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a low-odor low-VOC polypropylene composite material and a preparation method thereof.
Background
The polypropylene thermoplastic resin raw material has the characteristics of excellent comprehensive mechanical property, convenient processing, low price and the like, and is widely applied to the aspects of automobiles, electronic and electric appliances, mechanical parts, clothing and the like. In practical applications, as people's health consciousness is continuously increased, consumers begin to pay attention to the quality of air in the automobile, and therefore automobile part manufacturers have more and more strict requirements on product odor. Polypropylene composites, to varying degrees, release certain unpleasant odors, primarily as a result of the following aspects. First, the catalyst system used in the synthesis of the polypropylene resin matrix contains some lipid or alkane compounds with irritating off-flavors. Secondly, during the modification process of the polypropylene resin matrix, the polypropylene resin is melted under the processing condition of 230 ℃, and more or less thermal cracking small molecular compounds, such as ketone compounds and aldehyde compounds, are generated. Finally, certain additives, including various stabilizers and grafts, added to the modified polypropylene material can also have a certain irritating odor.
Regarding the reduction of odor and VOC of polypropylene composite material, some solutions are proposed in the related patents, and chinese patent CN201711432572 injects water into the polypropylene composite material melt during the extrusion process, and utilizes the principle of atomized extraction to remove the thermal cracking small molecules from the material, thereby improving the odor and VOC of the material. The method has good effect on improving the odor and VOC of the material, but needs to modify equipment, and has higher cost;
the Chinese patent application CN201010258937 utilizes aluminosilicate odor adsorption master batch to adsorb small molecules, thereby reducing organic matter emission. But there may be desorption of small molecule compounds affecting the final effect. Chinese patent application CN201610832020.4 uses diatomaceous earth, activated carbon, zinc ricinoleate capable of undergoing chelation reaction with small molecules of gas, and 3, 5-di-tert-butyl-4-hydroxycinnamic acid to remove the odor. There may also be desorption of small molecule compounds affecting the final effect.
Disclosure of Invention
The invention aims to provide a low-odor low-VOC polypropylene composite material which has the characteristics of no need of modifying production and processing equipment, simple preparation process, excellent odor and low content of organic volatile matters.
In order to achieve the purpose, the invention provides a low-odor low-VOC polypropylene composite material which is characterized by comprising the following components: 69.7-73 wt% of polypropylene, 25 wt% of talcum powder, 1-4 wt% of Accurel XP100-60 water-absorbing master batch, 0.4 wt% of antioxidant, 0.3 wt% of lubricant, 0.2 wt% of light stabilizer and 0.1-0.4 wt% of metal deactivator;
the Accurel XP100-60 water-absorbing master batch is formed by performing water absorption treatment on an Accurel XP100-60 plastic foaming carrier.
Further, the polypropylene is block copolymerization polypropylene produced by a gas phase hydrogen regulation method, the melt flow rate of the polypropylene at 230 ℃ and 2.16kg is 10-60g/10min, and the impact strength is more than or equal to 8KJ/m 2; polypropylene of the petrochemical PPK7726H is preferred.
Furthermore, the talcum powder is superfine talcum powder with the average grain size of less than 5 microns.
Further, the antioxidant is one or a mixture of at least two of hindered phenol antioxidant, thioester antioxidant and sulfite antioxidant.
Further, the lubricant is at least one of ethylene bis stearamide, polydimethylsiloxane, an organic silicon lubricant, an ethylene acrylic acid copolymer, polyethylene wax, pentaerythritol stearate, zinc stearate and calcium stearate;
further, the metal passivator is a hydrazine compound N, N' -disalicylidene-1, 2-propyldiamine.
Further, the Accurel XP100-60 water-absorbing master batch is prepared by putting a plastic foaming carrier Accurel XP100-60 into a low-speed stirrer with stirring blades subjected to passivation treatment, and then stirring the plastic foaming carrier Accurel XP 100-60: water ═ 5-7: (3-5), preferably 6:4, adding water into the stirrer, and then mixing at a low speed until the surfaces of the plastic foaming carrier particles are dried and free-flowing water does not exist, namely cooling to room temperature to obtain the Accurel XP100-60 water-absorbing master batch; preferably, the low speed is no more than 100 rpm.
Further, the plastic foaming carrier Accurel XP100-60 is a porous polymer formed by foaming polypropylene, the aperture is 60 microns, the adsorption rate is 40%, and the wall thickness is 500 microns.
Further, the plastic foam carrier Accurel XP100-60 was purchased from Mebothri, Germany.
Further, the preparation method comprises the following steps of,
preparation of premix: adding the needed polypropylene, talcum powder, Accurel XP100-60 water-absorbing master batch, antioxidant, lubricant, light stabilizer and metal deactivator into a high-speed stirrer, and uniformly stirring and mixing at high speed to obtain premix;
melt blending and extrusion: adding the obtained premix into a parallel double-screw extruder from a main feeding hopper, shearing, melting, blending and extruding all component materials in the parallel double-screw extruder, wherein the processing temperature of the double-screw extruder is 180-;
obtaining the low-odor low-VOC polypropylene composite material: and cooling, drying and granulating the material strips discharged from the neck mould of the parallel double-screw extruder to obtain the low-odor low-VOC polypropylene composite material.
The Accurel XP100-60 water-absorbing master batch is prepared by putting a plastic foaming carrier Accurel XP100-60 into a low-speed stirrer, and then mixing the plastic foaming carrier Accurel XP 100-60: water ═ 5-7: (3-5), preferably 6:4, adding water into the stirrer, and then mixing at a low speed until the surfaces of the plastic foaming carrier particles are dried and free flowing water does not exist, namely cooling to room temperature to obtain the Accurel XP100-60 water-absorbing master batch. The more water is used for assisting in removing odor in the subsequent twin-screw granulation, but if the water is too much, if the mass ratio of water is more than 3% when all materials enter the parallel twin-screw extruder, the water vapor pressure is too strong, the air pressure in the barrel of the twin-screw extruder is also too strong, the melt of the polypropylene composite material is sprayed back, and the production cannot be carried out smoothly. During the process of preparing the Accurel XP100-60 water-absorbing master batch, the following should be noted: different from the common mixing operation, the preparation process of the water-absorbing master batch requires a mixing process and equipment with low rotating speed and low shearing, and the mixing aims and effects are to ensure that water can be uniformly distributed so as to ensure that the adsorption capacity of each plastic foaming carrier can be as uniform as possible. The high speed and high shear mixing process does not have any positive effect on the increase of the adsorption rate, and may partially destroy the cell structure of the plastic foam carrier to reduce the actual adsorption rate, and may cause the adsorbed liquid to be desorbed, as in the centrifugal drier.
The invention provides a low-odor low-VOC polypropylene composite material, which is prepared by selecting a hydrogen regulation method low-odor polypropylene resin raw material, mixing and granulating the raw material with formula components after water absorption by utilizing self-made water-absorbing master batches, wherein water is vaporized at a high temperature in a shearing and plasticizing section of a screw rod of a cylinder body at a second section and a third section of an extruder, and small molecular substances in the composite material are attached in the process that high-temperature water vapor is gradually diffused to an outer layer in a melt of the composite material; the talcum powder which is an inorganic mineral filling material is added in the formula of the composite material, and because a small amount of impurities such as various metal ions, metal fine scraps, metal oxides and the like inevitably exist in natural inorganic mineral filling, even if the content is very small, a certain active center is still formed, so that the polypropylene is subjected to catalytic accelerated aging decomposition in a high-temperature environment; meanwhile, the production and processing temperature is reduced as much as possible, and the small molecular substances produced by aging and degradation of polypropylene due to high temperature are reduced, so that the low-odor and low-VOC polypropylene composite material can be prepared.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative of the invention and is not to be construed as limiting the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
The low-odor low-VOC polypropylene composite material is characterized by comprising the following components: 69.7-73 wt% of polypropylene, 25 wt% of talcum powder, 1-4 wt% of Accurel XP100-60 water-absorbing master batch, 0.4 wt% of antioxidant, 0.3 wt% of lubricant, 0.2 wt% of light stabilizer and 0.1-0.4 wt% of metal deactivator;
the Accurel XP100-60 water-absorbing master batch is formed by performing water absorption treatment on an Accurel XP100-60 plastic foaming carrier.
Further, the polypropylene is block copolymerization polypropylene produced by a gas phase hydrogen regulation method, the melt flow rate of the polypropylene at 230 ℃ and 2.16kg is 10-60g/10min, and the impact strength is more than or equal to 8KJ/m 2; polypropylene of the petrochemical PPK7726H is preferred.
Furthermore, the talcum powder is superfine talcum powder with the average grain size of less than 5 microns.
Further, the antioxidant is one or a mixture of at least two of hindered phenol antioxidant, thioester antioxidant and sulfite antioxidant.
Further, the lubricant is at least one of ethylene bis stearamide, polydimethylsiloxane, an organic silicon lubricant, an ethylene acrylic acid copolymer, polyethylene wax, pentaerythritol stearate, zinc stearate and calcium stearate;
further, the metal passivator is a hydrazine compound N, N' -disalicylidene-1, 2-propyldiamine.
Further, the Accurel XP100-60 water-absorbing master batch is prepared by putting a plastic foaming carrier Accurel XP100-60 into a low-speed stirrer with stirring blades subjected to passivation treatment, and then stirring the plastic foaming carrier Accurel XP 100-60: water ═ 5-7: (3-5), preferably 6:4, adding water into the stirrer, and then mixing at a low speed until the surfaces of the plastic foaming carrier particles are dry and free-flowing water does not exist, namely cooling to room temperature to obtain the Accurel XP100-60 water-absorbing master batch; preferably, the low speed is no more than 100 rpm.
Further, the plastic foaming carrier Accurel XP100-60 is a porous polymer formed by foaming polypropylene, the aperture is 60 microns, the adsorption rate is 40%, and the wall thickness is 500 microns.
Further, the plastic foam carrier Accurel XP100-60 was purchased from Mebothri, Germany.
Further, the preparation method comprises the following steps of,
preparation of premix: adding the needed polypropylene, talcum powder, Accurel XP100-60 water-absorbing master batch, antioxidant, lubricant, light stabilizer and metal deactivator into a high-speed stirrer, and uniformly stirring and mixing at high speed to obtain premix;
melt blending and extrusion: adding the obtained premix into a parallel double-screw extruder from a main feeding hopper, shearing, melting, blending and extruding all component materials in the parallel double-screw extruder, wherein the processing temperature of the double-screw extruder is 180-;
obtaining the low-odor low-VOC polypropylene composite material: and cooling, drying and granulating the material strips discharged from the neck mould of the parallel double-screw extruder to obtain the low-odor low-VOC polypropylene composite material.
The polypropylene is available from the metallocene petrochemical PPK 7726H.
Example 1: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1.
Preparing Accurel XP100-60 water-absorbing master batch: placing the plastic foaming carrier Accurel XP100-60 into a low-speed stirrer, and then pressing the foaming carrier Accurel XP 100-60: water was added to the mixer at a mass ratio of 6:4 and then mixed for 10-30 minutes. Stopping the machine to check the particles, if the surfaces of the foamed carrier particles are dry and free of free flowing water, cooling to room temperature, discharging and packaging to obtain the Accurel XP100-60 water-absorbing master batch.
Uniformly mixing polypropylene, talcum powder, Accurel XP100-60 water-absorbing master batch, antioxidant, lubricant, light stabilizer and metal deactivator weighed according to a certain proportion, adding the mixture into a parallel double-screw extruder from a main feeding port, and carrying out shearing, melting, blending and extruding on all component materials in the parallel double-screw extruder, wherein the processing temperature of the double-screw extruder is 180 ℃ in a first region, 190 ℃ in a second region, 190 ℃ in a third region, 190 ℃ in a fourth region, 190 ℃ in a fifth region, 180 ℃ in a sixth region, 180 ℃ in a seventh region, 180 ℃ in an eighth region, 180 ℃ in a ninth region, 190 ℃ in a tenth region and 200 ℃ in a head, and the seventh region and the ninth region are;
and finally, cooling, drying and granulating the material strips discharged from the neck mould of the parallel double-screw extruder to obtain the low-odor low-VOC polypropylene composite material.
TABLE 1 raw material usage amount of examples 1 to 4 and comparative examples 1 to 4 (wt%)
Figure BDA0002347404200000051
Example 2: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1;
the preparation method is the same as example 1, and the effects are shown in Table 2.
Example 3: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1;
the preparation method is the same as example 1, and the effects are shown in Table 2.
Example 4: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1;
the preparation method is the same as example 1, and the effects are shown in Table 2.
Comparative example 1: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1;
the preparation method is the same as example 1, and the effects are shown in Table 2.
The Capature PPC-HDPE water-absorbing master batch is a master batch formed by performing water absorption treatment on a plastic foaming carrier Capature PPC-HDPE, the plastic foaming carrier Capature PPC-HDPE is a porous polymer formed by foaming polyethylene, the pore diameter is 20 micrometers, the adsorption rate is 20 percent, the wall thickness is 1000 micrometers, and Nanjing Neede New Material company.
The manufacturing method of the Capature PPC-HDPE water-absorbing master batch is substantially the same as that of the Accurel XP100-60 water-absorbing master batch, and the difference is that the Capature PPC-HDPE has small pore diameter and small adsorption rate, and the mass ratio of materials is changed into a foaming carrier Capature PPC-HDPE when mixed: and 8:2 of water.
Comparative example 2: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1;
the preparation method is the same as example 1, and the effects are shown in Table 2.
The Accurel XP100-84 water-absorbing master batch is a master batch formed by performing water absorption treatment on an Accurel XP100-84 plastic foaming carrier, the Accurel XP100-84 plastic foaming carrier is a porous polymer formed by foaming polypropylene, the pore diameter is 84 micrometers, the adsorption rate is 80 percent, the wall thickness is 200 micrometers, and Nanjing Nennetedder new material company.
The manufacturing method of the Accurel XP100-84 water-absorbing master batch is almost the same as that of the Accurel XP100-60 water-absorbing master batch, and the difference is that the mass ratio of materials is changed into the mass ratio of a foaming carrier Accurel XP 100-84: and (4) water is 2: 8.
Comparative example 3: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1;
the preparation method is the same as example 1, and the effects are shown in Table 2.
Comparative example 4: preparation of low-odor low-VOC polypropylene composite material
The used raw materials are as follows: see table 1;
the preparation method is the same as example 1, and the effects are shown in Table 2.
The results of the above experimental groups and comparative examples were examined as follows: melt index, density, tensile strength, izod notched impact strength, odor rating, total carbon emissions.
The odor grade is carried out according to the public PV3900 standard, and the specific detection method comprises the following steps: the samples were stored in a closed container at 80 ℃ for 2 hours, cooled to 60 ℃ and then rated according to the rating score rating of the PV3900 standard with more than 5 people participating in the evaluation to arrive at a statistical overall judgment. 1 is odorless, 2 is odorous, but has no irritation; 3, the composition has obvious smell but no irritation; 4, pungent smell is generated; 5, strong pungent smell is obtained; a score of 6 indicates an intolerable odor.
The total carbon emission is carried out according to the popular PV3341 standard, and the specific detection method comprises the following steps: the sample is prepared at a predetermined position over the entire cross-section of the structural part by measuring with a headspace gas chromatograph, and is cut into pieces having a weight of 10mg to 25mg, without heating the sample during this process. The weight of the sample was 1 g. + -. 0.001g per 10ml of the bottle volume in terms of the bottle volume.
Other specific detection methods refer to standard detection, and are not described herein. The results are shown in table 2 below:
TABLE 2 TABLE of examination results of examples 1 to 8 and comparative examples 1 to 3
Figure BDA0002347404200000071
Figure BDA0002347404200000081
As can be seen from Table 2, in comparative example 1 and example 2, as the proportion of the water-absorbing master batches is increased, the water vapor in the composite material melt in the screw is abundant, enough water vapor channels are formed, and more small molecular substances can be taken away, so that the odor and TVOC of the final composite material are reduced; compared with the embodiment 2 and the embodiment 3, with the increase of the proportion of the metal passivator, a small amount of impurities such as metal ions, metal fine scraps, metal oxides and the like in the natural inorganic filling materials such as talcum powder and the like are chelated and shielded to lose the action of active centers, inhibit the catalytic oxidation action of the metal ions on polypropylene, inhibit the aging of the polypropylene and reduce the generation of small molecular substances, so that the odor and TVOC of the final composite material are reduced; compared with the comparative example 1 and the example 2, the water-absorbing master batch carrier with too small pore diameter is used, because the water absorption rate is too small and the water vapor is insufficient, a sufficient water vapor passage cannot be formed, the small molecular substances are carried away limitedly, and finally the effect of low odor and low VOC is not as good as that of the scheme of the example 2; comparative example 2 and example 4, with the absorbent master batch carrier with too large pore diameter, because the pore wall is too thin, the pore wall is easy to be blocked by extrusion deformation in the stirring and mixing process of making the absorbent master batch, so that the actual water absorption is affected, and because the pore wall is too thin, the pore is easy to be softened and melted by high temperature at the feed opening of the first section of the barrel body of the extruder, so that the pore is broken, so that part of water is vaporized and escaped from the feed opening at high temperature, the water actually entering the melt at the rear section is insufficient, a sufficient water vapor passage cannot be formed, the small molecular substances are carried away, and the effect of low odor and low VOC is not as that; comparative example 3 and example 3, the water-absorbing master batch is not added, a water vapor channel cannot be formed in the composite material melt in the screw, small molecular substances are difficult to discharge, and the odor and TVOC of the composite material cannot be reduced; comparative example 4 and example 4, no metal passivator is added, and impurities such as small amount of metal ions, metal fine powder, metal oxides and the like in the natural inorganic mineral filling stone powder are not chelated and shielded, so that the formed active center is easy to catalyze and accelerate the aging of polypropylene under a high-temperature environment, more small molecular substances are generated, and the odor and TVOC are increased.
In conclusion, by adopting the technical scheme of the invention, the prepared low-odor low-VOC polypropylene composite material has excellent odor grade (the odor grade is less than 3) and low total carbon emission (the total carbon emission is less than or equal to 30 ug/g).
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims (10)

1. The low-odor low-VOC polypropylene composite material is characterized by comprising the following components: 69.7-73 wt% of polypropylene, 25 wt% of talcum powder, 1-4 wt% of Accurel XP100-60 water-absorbing master batch, 0.4 wt% of antioxidant, 0.3 wt% of lubricant, 0.2 wt% of light stabilizer and 0.1-0.4 wt% of metal deactivator;
the Accurel XP100-60 water-absorbing master batch is formed by performing water absorption treatment on an Accurel XP100-60 plastic foaming carrier.
2. The low-odor and low-VOC polypropylene composite of claim 1, wherein said polypropylene is a block copolymer polypropylene produced by gas phase hydrogen blending, said polypropylene having a melt flow rate of 2.16kg at 230 ℃ of 10-60g/10min and an impact strength of 8KJ/m2 or more; polypropylene of the petrochemical PPK7726H is preferred.
3. The low odor, low VOC polypropylene composite of claim 1, wherein the talc is ultra fine talc having an average particle size of less than 5 microns.
4. The low odor and low VOC polypropylene composite of claim 1 wherein said antioxidant is one or a combination of at least two of hindered phenolic antioxidants, thioester antioxidants, and thioester antioxidants.
5. The low odor, low VOC polypropylene composite of claim 1, wherein the lubricant is at least one of ethylene bis stearamide, polydimethylsiloxane, silicone lubricant, ethylene acrylic acid copolymer, polyethylene wax, pentaerythritol stearate, zinc stearate, and calcium stearate.
6. The low odor, low VOC polypropylene composite of claim 1, wherein the metal deactivator is a hydrazine-based compound, N' -disalicylidene-1, 2-propyldiamine.
7. The low-odor and low-VOC polypropylene composite material as claimed in claim 1, wherein the Accurel XP100-60 water-absorbing master batch is prepared by putting a plastic foaming carrier Accurel XP100-60 into a low-speed stirrer of a stirring blade subjected to passivation treatment, and then mixing the plastic foaming carrier Accurel XP 100-60: water ═ 5-7: (3-5), preferably 6:4, adding water into the stirrer, and then mixing at a low speed until the surfaces of the plastic foaming carrier particles are dried and free-flowing water does not exist, namely cooling to room temperature to obtain the Accurel XP100-60 water-absorbing master batch; preferably, the low speed is no more than 100 rpm.
8. The low-odor and low-VOC polypropylene composite material as claimed in claim 7, wherein said plastic foam carrier Accurel XP100-60 is a porous polymer formed by foaming polypropylene, and has a pore size of 60 microns, an adsorption rate of 40% and a wall thickness of 500 microns.
9. The low odor, low VOC polypropylene composite of claim 1 wherein the plastic foam carrier Accurel XP100-60 is available from mebor corp, germany.
10. The low-odor low-VOC polypropylene composite of any of claims 1-9, wherein said method of making is,
preparation of premix: adding the needed polypropylene, talcum powder, Accurel XP100-60 water-absorbing master batch, antioxidant, lubricant, light stabilizer and metal deactivator into a high-speed stirrer, and uniformly stirring and mixing at high speed to obtain premix;
melt blending and extrusion: adding the obtained premix into a parallel double-screw extruder from a main feeding hopper, shearing, melting, blending and extruding all component materials in the parallel double-screw extruder, wherein the processing temperature of the double-screw extruder is 180-;
obtaining the low-odor low-VOC polypropylene composite material: and cooling, drying and granulating the material strips discharged from the neck mould of the parallel double-screw extruder to obtain the low-odor low-VOC polypropylene composite material.
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