Low-emission regenerated polypropylene composite material for automotive trim and preparation method of low-emission regenerated polypropylene composite material

Abstract

The invention discloses a low-emission regenerated polypropylene composite material for automotive trim and a preparation method of the low-emission regenerated polypropylene composite material, and belongs to the technical field of polymer composite materials. The polypropylene composite material comprises the following raw materials in parts by mass: 10-88 parts of polypropylene, 5-40 parts of regenerated polypropylene, 0-20 parts of an inorganic filler, 2-10 parts of calcium carbonate, 2-15 parts of a flexibilizer, 1-3 parts of a deodorant and 0.5-3 parts of a processing aid. Regenerated polypropylene granules are ground into powder in a ball mill, and the powder is cleaned in an ethanol water solution, so that some small impurity components in regenerated polypropylene are removed. A diluted hydrochloric acid aqueous solution is injected into water injection equipment, hydrochloric acid reacts with calcium carbonate in the polypropylene composite material to release carbon dioxide gas to extract part of small molecules, and odor and volatile substances in the system are discharged in the processing process in cooperation with water vapor, so that the volatile substances and odor of the material are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a low-emission recycled polypropylene composite material for automobile interior decoration and a preparation method thereof. Background Art

[0002] Polypropylene (PP) is one of the five general-purpose plastics. It is widely used in many fields such as automobiles, home appliances, electronic appliances, power tools, and medical treatment due to its good physical, chemical, mechanical and processing properties. However, a large amount of waste plastics is also produced, so the use of these waste plastics will become a future development theme.

[0003] At present, recycled polypropylene has begun to be used in some fields, such as automotive exterior bumpers, grilles and other products. However, since automotive interiors have high environmental protection requirements for materials and pay attention to the health and olfactory perception of drivers and passengers, they have high requirements for the emission of automotive interior materials. Recycled materials are degraded after multiple processing, and because additives or recycled materials are added to plastic products, plastic products carry ethylene, hydrogen sulfide, sulfur dioxide, amines, ammonia odors or other odors. Some of the odors are released after the products are stored for a period of time; sometimes they lurk in plastic products, and these harmful gases are released during secondary processing, forming the odor of plastics. Therefore, the application of recycled polypropylene in the field of automotive interiors, such as door panels, dashboards, pillars and other products, is greatly limited. Summary of the invention

[0004] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a low-emission recycled polypropylene composite material for automobile interior and a preparation method thereof, thereby solving the problems in the prior art.

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

[0006] The low-emission recycled polypropylene composite material used for automobile interior includes the following raw materials in parts by weight: 10 to 88 parts of polypropylene, 5 to 40 parts of recycled polypropylene, 0 to 20 parts of inorganic filler, 2 to 10 parts of calcium carbonate, 2 to 15 parts of toughening agent, 1 to 3 parts of deodorant, and 0.5 to 3 parts of processing aid.

[0007] Furthermore, the polypropylene is at least one of homopolypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer and propylene-1-butene random block.

[0008] Furthermore, the recycled polypropylene is at least one of household appliance shell disintegration granulation material, battery shell crushing granulation material, and ton bag crushing granulation material.

[0009] Furthermore, the inorganic filler is at least one of talc, whiskers, mica and wollastonite.

[0010] Furthermore, the toughening agent is at least one of POE, LLDPE, HDPE and SEBS.

[0011] Furthermore, the deodorant is porous silicate.

[0012] Furthermore, the processing aid is at least one of an antioxidant, a weathering agent, a lubricant, and a toner.

[0013] The method for preparing the low-emission recycled polypropylene composite material for automobile interior decoration comprises the following steps:

[0014] S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in an ethanol aqueous solution to remove impurities and small molecules;

[0015] S2. Premix polypropylene, recycled polypropylene after impurity removal, inorganic filler, calcium carbonate, toughening agent, deodorant and processing aid in a high-speed mixer in proportion to obtain a premix, and place the premix in a twin-screw extruder. Inject dilute hydrochloric acid aqueous solution into the extruder melt, assisted by vacuum negative pressure, extrude granulation, cool and pelletize to obtain a low-emission recycled polypropylene composite material.

[0016] Furthermore, the temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 5 to 15 g / L; the vacuum negative pressure is -0.06 to -0.09 MPa.

[0017] The above-mentioned low-emission recycled polypropylene composite material for automobile interior is used in the preparation of automobile interior.

[0018] Beneficial effects of the present invention:

[0019] 1. The present invention utilizes liquid nitrogen atmosphere to grind the recycled polypropylene pellets into powder in a ball mill, and washes them in an ethanol aqueous solution to remove some small impurities in the recycled polypropylene.

[0020] 2. The present invention uses a dilute hydrochloric acid aqueous solution to be injected into a water injection device, and uses the hydrochloric acid to react with calcium carbonate in the polypropylene composite material to release carbon dioxide gas to extract some small molecules, and together with water vapor, odorous and volatile substances in the system are discharged during the processing, thereby reducing the volatile substances and odor of the material.

[0021] 3. The porous silicate odor adsorbent is added in the present invention. Due to its porous structure, it can lock the small molecules that are not completely extracted by carbon dioxide and the volatile substances that cannot be removed by water vapor in the porous structure, thereby playing a role in synergistically reducing the emission of the composite material.

[0022] 4. The low-emission recycled polypropylene composite material prepared by the present invention can be applied to automobile interior parts such as door panels, dashboards, pillars, etc., expanding the recycling field of recycled polypropylene materials. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Low-emission recycled polypropylene composite material for automotive interiors, including the following raw materials in parts by weight:

[0025] Polypropylene 10-88 parts, recycled polypropylene 5-40 parts, inorganic filler 0-20 parts, calcium carbonate 2-10 parts, toughening agent 2-15 parts, deodorant 1-3 parts, processing aid 0.5-3 parts;

[0026] The polypropylene is at least one of homopolypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer and propylene-1-butene random block.

[0027] The recycled polypropylene is at least one of the following materials: household appliance shell disintegration granulation material, battery shell crushing granulation material, and ton bag crushing granulation material.

[0028] The inorganic filler is at least one of talc, whisker, mica and wollastonite.

[0029] The particle size of calcium carbonate is 2000 mesh or more.

[0030] The toughening agent is at least one of POE, LLDPE, HDPE and SEBS.

[0031] The deodorant is porous silicate.

[0032] At least one of the processing aids antioxidant, weathering agent, lubricant, and color powder.

[0033] The following examples are used to specifically introduce the preparation process of the low-emission recycled polypropylene composite material for automobile interior decoration; and the parts mentioned in the examples and comparative examples are all parts by mass; the raw materials used in the examples are as follows:

[0034] Polypropylene, brand M60RHC, copolymer polypropylene, Zhenhai Refining and Chemical;

[0035] Recycled polypropylene, battery shell material, Jiangxi GreenMe;

[0036] Talc, 1250 mesh talc 90-20-A, Guangxi Longsheng Huamei Talc;

[0037] Calcium carbonate, activated calcium carbonate 053B, particle size 2500 mesh, Jiangsu Qunxin powder;

[0038] Toughener, POE, brand LC565, LG Chemical;

[0039] Porous silicate, brand JH-200A, average pore size 5nm, Ningbo Jiahe New Materials;

[0040] The processing aids are conventional commercially available aids:

[0041] Antioxidant 1010, BASF;

[0042] Antioxidant 168, BASF;

[0043] Lubricant calcium stearate, brand CV500, Dongguan Hanwei Technology Co., Ltd.;

[0044] Lubricant silicone masterbatch, brand BZPP301, Chongqing Baozhuan New Material Technology Co., Ltd.;

[0045] Light stabilizer, brand 3808PP5, cyanotera.

[0046] Example 1

[0047] The preparation process of low-emission recycled polypropylene composite materials for automotive interiors includes:

[0048] S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0049] S2. 88 parts of polypropylene, 5 parts of recycled polypropylene, 2 parts of calcium carbonate, 2 parts of toughening agent POE, 1 part of deodorant (porous silicate), 0.2 parts of antioxidant 1010 and 0.3 parts of antioxidant 168 are premixed uniformly in a high-speed mixer to obtain a premix, and the premix is ​​placed in a twin-screw extruder. A dilute hydrochloric acid aqueous solution is injected into the melt of the extruder using a water injection device, and the vacuum negative pressure value is turned on to -0.06 MPa. Extrusion granulation, cooling, and pelletizing are performed to obtain a low-emission recycled polypropylene composite material.

[0050] The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 5g / L.

[0051] Example 2

[0052] The preparation process of low-emission recycled polypropylene composite materials for automotive interiors includes:

[0053] S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0054] S2. Premix 72 parts of polypropylene, 10 parts of recycled polypropylene, 5 parts of talc, 4 parts of calcium carbonate, 5 parts of toughening agent POE, 2 parts of deodorant (porous silicate), 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder, and use a water injection device to inject dilute hydrochloric acid aqueous solution into the extruder melt, and turn on the vacuum negative pressure value of -0.07MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0055] The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 10g / L.

[0056] Example 3

[0057] The preparation process of low-emission recycled polypropylene composite materials for automotive interiors includes:

[0058] S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0059] S2. Premix 50 parts of polypropylene, 20 parts of recycled polypropylene, 10 parts of talc, 6 parts of calcium carbonate, 10 parts of toughening agent POE, 2 parts of deodorant (porous silicate), 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder, and use a water injection device to inject dilute hydrochloric acid aqueous solution into the extruder melt, and turn on the vacuum negative pressure value of -0.08MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0060] The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 15g / L.

[0061] Example 4

[0062] The preparation process of low-emission recycled polypropylene composite materials for automotive interiors includes:

[0063] S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0064] S2. Premix 22 parts of polypropylene, 30 parts of recycled polypropylene, 15 parts of talc, 8 parts of calcium carbonate, 15 parts of toughening agent POE, 3 parts of deodorant (porous silicate), 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 1 part of lubricant silicone masterbatch, 0.3 parts of light stabilizer and 1 part of black masterbatch in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder, and use a water injection device to inject dilute hydrochloric acid aqueous solution into the extruder melt, and turn on the vacuum negative pressure value to -0.09 MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0065] The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 15g / L.

[0066] Example 5

[0067] The preparation process of low-emission recycled polypropylene composite materials for automotive interiors includes:

[0068] S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0069] S2. Premix 10 parts of polypropylene, 40 parts of recycled polypropylene, 20 parts of talc, 10 parts of calcium carbonate, 10 parts of toughening agent POE, 3 parts of deodorant (porous silicate), 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 1 part of lubricant silicone masterbatch, 0.3 parts of light stabilizer and 1 part of black masterbatch in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder, and use a water injection device to inject dilute hydrochloric acid aqueous solution into the extruder melt, and turn on the vacuum negative pressure value to -0.09 MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0070] The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 15g / L.

[0071] The raw material formula in Examples 1-5 is shown in Table 1

[0072] Table 1 Raw material formula in Examples 1-5

[0073]

[0074]

[0075] Comparative Example 1

[0076] The preparation process of polypropylene composite materials includes:

[0077] 40 parts of polypropylene, 20 parts of recycled polypropylene, 10 parts of talc, 6 parts of calcium carbonate, 15 parts of toughening agent, 2 parts of deodorant, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch are premixed uniformly in a high-speed mixer in proportion to obtain a premix, which is placed in a twin-screw extruder, and a dilute hydrochloric acid aqueous solution is injected into the melt of the extruder by a water injection device, and the vacuum negative pressure value is turned on to -0.08 MPa, and extrusion granulation, cooling and pelletizing are performed to obtain a low-emission recycled polypropylene composite material.

[0078] The temperatures of zones 1 to 10 of the extruder are 160° C., 210° C., 210° C., 210° C., 200° C., 200° C., 200° C., 200° C., 200° C., 210° C. respectively. The dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 15 g / L.

[0079] Comparative Example 2

[0080] The preparation process of polypropylene composite materials includes:

[0081] S1. Wash the regenerated polypropylene in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0082] S2. Premix 40 parts of polypropylene, 20 parts of recycled polypropylene, 10 parts of talcum powder, 6 parts of calcium carbonate, 15 parts of toughening agent, 2 parts of deodorant, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch in proportion in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder, and use a water injection device to inject dilute hydrochloric acid aqueous solution into the extruder melt, and turn on the vacuum negative pressure value to -0.08MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0083] The temperatures of zones 1 to 10 of the extruder are 160° C., 210° C., 210° C., 210° C., 200° C., 200° C., 200° C., 200° C., 200° C., 210° C. respectively. The dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 15 g / L.

[0084] Comparative Example 3

[0085] The preparation process of polypropylene composite materials includes:

[0086] S1. Grind the regenerated polypropylene into powder under liquid nitrogen conditions, and wash it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0087] S2. Premix 40 parts of polypropylene, 20 parts of recycled polypropylene, 16 parts of talcum powder, 15 parts of toughening agent, 2 parts of deodorant, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch in proportion in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder, and use a water injection device to inject dilute hydrochloric acid aqueous solution into the melt of the extruder, and turn on the vacuum negative pressure value of -0.08MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0088] The temperatures of zones 1 to 10 of the extruder are 160° C., 210° C., 210° C., 210° C., 200° C., 200° C., 200° C., 200° C., 200° C., 210° C. respectively. The dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 15 g / L.

[0089] Comparative Example 4

[0090] The preparation process of polypropylene composite materials includes:

[0091] S1. Grind the regenerated polypropylene into powder under liquid nitrogen conditions, and wash it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0092] S2. Premix 40 parts of polypropylene, 20 parts of recycled polypropylene, 10 parts of talcum powder, 6 parts of calcium carbonate, 15 parts of toughening agent, 2 parts of deodorant, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch in proportion in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder. Use a water injection device to inject distilled water into the melt in the extruder, turn on the vacuum negative pressure value to -0.08 MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0093] The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; and distilled water is injected from zone 3 of the extruder.

[0094] Comparative Example 5

[0095] The preparation process of polypropylene composite materials includes:

[0096] S1. Grind the regenerated polypropylene into powder under liquid nitrogen conditions, and wash it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0097] S2. Premix 40 parts of polypropylene, 20 parts of recycled polypropylene, 10 parts of talcum powder, 6 parts of calcium carbonate, 15 parts of toughening agent, 2 parts of deodorant, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch in proportion in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder, open the vacuum negative pressure value to -0.08MPa, extrude granulation, cool and pelletize to obtain a low-emission recycled polypropylene composite material.

[0098] The temperatures of extruder zones 1 to 10 are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively.

[0099] Comparative Example 6

[0100] The preparation process of polypropylene composite materials includes:

[0101] S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in a 50% ethanol aqueous solution to remove impurities and small molecules;

[0102] S2. Premix 52 parts of polypropylene, 20 parts of recycled polypropylene, 10 parts of talc, 6 parts of calcium carbonate, 10 parts of toughening agent POE, 0.2 parts of antioxidant 1010, 0.3 parts of antioxidant 168, 0.2 parts of lubricant calcium stearate, 0.3 parts of lubricant silicone masterbatch and 1 part of black masterbatch in a high-speed mixer to obtain a premix, and place it in a twin-screw extruder. Use a water injection device to inject dilute hydrochloric acid aqueous solution into the extruder melt, turn on the vacuum negative pressure value of -0.08MPa, extrude granulation, cool, and pelletize to obtain a low-emission recycled polypropylene composite material.

[0103] The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 15g / L.

[0104] Experimental testing

[0105] The polypropylene composite materials obtained in Examples 1 to 5 and Comparative Examples 1 to 5 were tested for tensile strength, elongation at break, notched impact strength, odor level, atomization, etc. It is worth noting that these tests are familiar to those skilled in the art, and the specific test methods are not described here. The test results are shown in Table 2 below:

[0106] Table 2 Test results of polypropylene composite materials in Examples 1 to 5 and Comparative Examples 1 to 6

[0107]

[0108]

[0109] From the data in Table 2 above, it can be seen that the recycled polypropylene is ball-milled into powder under liquid nitrogen conditions and placed in an ethanol aqueous solution for cleaning to remove impurities and small molecules; and in the extrusion granulation process, a dilute hydrochloric acid aqueous solution is injected into the extruder, and dilute hydrochloric acid and calcium carbonate are reacted in a twin screw to generate carbon dioxide gas to extract some small molecules, and odorous and volatile substances are discharged in the process together with water vapor, and under the synergistic adsorption effect of porous silicate; the prepared recycled polypropylene composite material not only has good basic physical properties, but also exhibits excellent low emission, and its odor level and atomization value are both low.

[0110] According to Example 3 and Comparative Example 1 and Comparative Example 2, it can be seen that even if the regenerated polypropylene that has not been treated by the liquid nitrogen atmosphere ball milling process is removed by ethanol aqueous solution, the impurities and small molecules in the regenerated polypropylene cannot be removed, so that the prepared regenerated polypropylene composite material not only has poor odor, high atomization value, but also has a certain tendency to decrease in basic mechanical properties, which is due to the negative impact of small molecule impurities on system performance. The results of Example 3 and Comparative Example 3, Comparative Example 4, and Comparative Example 5 show that when calcium carbonate powder is not added to the composite material system, or dilute hydrochloric acid aqueous solution is not injected during the processing, carbon dioxide gas cannot be formed to extract small molecules, so that good low emission cannot be formed. Simply injecting distilled water cannot completely remove all volatile substances. The results of Example 3 and Comparative Example 6 show that when there is no porous silicate odor adsorbent, some low-molecular volatiles cannot be completely extracted or steam discharged, which will cause the final prepared composite material to have poor odor and high atomization value, and the addition of porous silicate odor adsorbent can synergistically adsorb the residual low-molecular volatiles. According to the above summary, compared with the comparative example, the present invention has a significant improvement effect on odor while ensuring excellent material properties. Therefore, the polypropylene composite material prepared by the present invention can be applied to automotive interior products according to customer needs to meet their different odor requirements.

[0111] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. Low-emission recycled polypropylene composite material for automotive interior, characterized in that: The invention comprises the following raw materials in parts by weight: 10 to 88 parts of polypropylene, 5 to 40 parts of recycled polypropylene, 0 to 20 parts of inorganic filler, 2 to 10 parts of calcium carbonate, 2 to 15 parts of toughening agent, 1 to 3 parts of deodorant and 0.5 to 3 parts of processing aid.

2. The low-emission recycled polypropylene composite material for automobile interior according to claim 1, characterized in that: The polypropylene is at least one of homopolypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer and propylene-1-butene random block.

3. The low-emission recycled polypropylene composite material for automobile interior according to claim 1, characterized in that: The recycled polypropylene is at least one of household appliance shell disintegration granulation material, battery shell crushing granulation material, and ton bag crushing granulation material.

4. The low-emission recycled polypropylene composite material for automobile interior according to claim 1, characterized in that: The inorganic filler is at least one of talc, whisker, mica and wollastonite.

5. The low-emission recycled polypropylene composite material for automobile interior according to claim 1, characterized in that: The toughening agent is at least one of POE, LLDPE, HDPE and SEBS.

6. The low-emission recycled polypropylene composite material for automobile interior according to claim 1, characterized in that: The deodorant is porous silicate.

7. The low-emission recycled polypropylene composite material for automobile interior according to claim 1, characterized in that: The processing aid is at least one of an antioxidant, a weathering agent, a lubricant, and a toner.

8. The method for preparing the low-emission recycled polypropylene composite material for automobile interior decoration according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Grinding the regenerated polypropylene into powder under liquid nitrogen conditions, and washing it in an ethanol aqueous solution to remove impurities and small molecules; S2. Premix polypropylene, recycled polypropylene after impurity removal, inorganic filler, calcium carbonate, toughening agent, deodorant and processing aid in a high-speed mixer in proportion to obtain a premix, and place the premix in a twin-screw extruder. Inject dilute hydrochloric acid aqueous solution into the extruder melt, assisted by vacuum negative pressure, extrude granulation, cool and pelletize to obtain a low-emission recycled polypropylene composite material.

9. The method for preparing the low-emission recycled polypropylene composite material for automobile interior according to claim 8, characterized in that: The temperatures of zones 1 to 10 of the extruder are 160°C, 210°C, 210°C, 210°C, 200°C, 200°C, 200°C, 200°C, 210°C respectively; the dilute hydrochloric acid aqueous solution is injected from zone 3 of the extruder, and the concentration of the hydrochloric acid aqueous solution is 5 to 15 g / L; the vacuum negative pressure is -0.06 to -0.09 MPa.

10. Use of the low-emission recycled polypropylene composite material for automobile interior according to any one of claims 1 to 7 in the preparation of automobile interior.

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