A weather-resistant modified PP-TPE composite material formula for vehicle storage

Abstract

The application discloses a weather-resistant modified PP-TPE composite material formula for vehicle storage, which comprises the following components in percentage by weight: 68-72% of polypropylene, 16-20% of thermoplastic elastomer, 2-3% of anti-aging agent, 3-4% of toughening agent, 1-2% of aldehyde inhibitor and 2-3% of inorganic hollow microbeads, and the sum of the components is 100%. The composite material has a formaldehyde release amount of less than 0.01 mg / m3 and a use temperature range of-40-85 DEG C. The application has the advantages of wide-temperature weather resistance, low-aldehyde health, impact resistance and light weight.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, and in particular to a formulation, preparation method and application of a weather-resistant modified PP-TPE composite material for vehicle storage with wide temperature resistance, low formaldehyde release and impact resistance. Background Technology

[0002] As in-vehicle storage solutions become more automotive-grade, the materials used for these storage boxes must simultaneously meet the requirements of both the extreme environment inside the vehicle and health and safety standards. Existing automotive storage box materials mainly suffer from the following problems: (1) Insufficient weather resistance: Ordinary polypropylene boxes are prone to aging, embrittlement, deformation and cracking under the cycle of high temperature in summer (up to 85 degrees Celsius) and low temperature in winter (up to -40 degrees Celsius) inside the vehicle; (2) Poor low-temperature toughness: The low-temperature impact resistance of single polypropylene material is poor, and it is easy to break under the bumps of driving and the drop during handling; (3) Formaldehyde release: Formaldehyde-containing additives or recycled materials continuously release formaldehyde in the closed vehicle, endangering the health of passengers; (4) Single function: The process routes such as braided reinforced polypropylene focus on specific strength and molding efficiency, and do not design formulations for formaldehyde inhibition and wide-temperature elastomer composites.

[0003] Therefore, there is a need for a weather-resistant modified PP-TPE composite material formulation for vehicle storage that is wide-temperature weather resistant, low formaldehyde release, and impact resistant. Summary of the Invention

[0004] The purpose of this invention is to provide a weather-resistant modified PP-TPE composite material formulation for vehicle storage, so as to solve the technical problems of insufficient weather resistance, poor low-temperature toughness, formaldehyde release, and single function in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A weather-resistant modified PP-TPE composite material for vehicle storage comprises, by weight percentage: 68% to 72% polypropylene, 16% to 20% thermoplastic elastomer, 2% to 3% anti-aging agent, 3% to 4% toughening agent, 1% to 2% formaldehyde inhibitor, and 2% to 3% inorganic hollow microspheres, with the sum of all components being 100%. The formaldehyde emission of the composite material is less than 0.01 mg / m³, and the operating temperature range is -40°C to 85°C.

[0006] The preferred embodiments of the present invention are as described in claims 2 to 8: the polypropylene grade and elastomer type are as described in claim 2; the anti-aging agent compounding ratio is as described in claim 3; the toughening agent type is as described in claim 4; the formaldehyde inhibitor type is as described in claim 5; the inorganic hollow microsphere type and particle size are as described in claim 6; the point value formulation is as described in claim 7; and the mechanical property design target is as described in claim 8. The uses are as described in claim 9; and the preparation methods are as described in claims 10 to 12. Examples 1 to 4 of the specific embodiments provide implementation methods for the above solutions.

[0007] Compared with the prior art, the beneficial effects of the present invention include: 1. Toughened with polypropylene-thermoplastic elastomer composite, it can be used in a wide temperature range of -40 degrees Celsius to 85 degrees Celsius, and is impact-resistant and does not crack at low temperatures; 2. The combination of hindered amine light stabilizer and antioxidant provides anti-aging protection and long-term resistance to aging in the high-temperature and ultraviolet environment inside the vehicle. 3. Acylhydrazine-based formaldehyde inhibitors capture free formaldehyde, with formaldehyde release less than 0.01 mg per cubic meter, ensuring health and safety inside the sealed vehicle. 4. Inorganic hollow microspheres reduce weight and improve dimensional stability; the formula does not contain weaving reinforcement process, resulting in high injection molding efficiency. 5. The above components form a synergistic effect: the elastomer provides a tough matrix, the anti-aging agent ensures weather resistance, the formaldehyde inhibitor ensures health, and the hollow microspheres balance stiffness and weight. The four constitute a closed-loop formula of "toughness → weather resistance → health → lightweight", rather than a simple superposition of components. Attached Figure Description

[0008] Figure 1 This is a schematic flowchart of the preparation method of the weather-resistant modified PP-TPE composite material for vehicle storage according to the present invention; Figure 2 This is a schematic diagram of the structure of the vehicle storage box formed by injection molding of composite material according to the present invention.

[0009] This invention pertains to material formulations and does not include any device-related figures or symbols. Detailed Implementation

[0010] Weigh the following components by weight percentage: 72% copolymer polypropylene (melt flow rate 20 g / 10 min), 18% polyolefin thermoplastic elastomer, 2.5% anti-aging agent (hindered amine light stabilizer and antioxidant compounded at a ratio of 1.5:1), 3.5% ethylene-octene copolymer toughening agent, 1.5% acylhydrazine formaldehyde scavenger, and 2.5% hollow glass microspheres (particle size 20 to 80 micrometers). The sum of all components is 100%. Mix all components in a high-speed mixer for 5 to 10 minutes to obtain a premix.

[0011] The premixed material is melt-extruded by a twin-screw extruder at an extrusion temperature of 180 to 220 degrees Celsius (zone temperature control) and a screw speed of 200 to 400 rpm. After water cooling and pelletizing, the composite material granules are obtained.

[0012] Composite material granules are injection molded using an injection molding machine at a barrel temperature of 190°C to 230°C and a mold temperature of 40°C to 60°C to produce vehicle storage boxes with a wall thickness of 1.5 mm to 2.5 mm. The nominal dimensions of the box are 450 mm × 360 mm × 220 mm, and the weight of a single unit is 2.2 kg.

[0013] The composite material prepared according to the above formula and process has the following characteristics: formaldehyde emission of less than 0.01 mg / m³, operating temperature range of -40°C to 85°C, flexural modulus of 1200 MPa to 1800 MPa, and notched impact strength of simply supported beam of 15 kJ to 30 kJ / m² (design target values, subject to actual measurement of samples); the material complies with REACH regulations and FDA food contact requirements (subject to third-party testing). Compared with the braided reinforced polypropylene process, this formula uses elastomer composite toughening instead of braiding reinforcement, eliminating the need for braiding layup in injection molding.

[0014] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A weather-resistant modified PP-TPE composite material for vehicle storage, characterized in that, The composite material comprises, by weight percentage: 68% to 72% polypropylene, 16% to 20% thermoplastic elastomer, 2% to 3% anti-aging agent, 3% to 4% toughening agent, 1% to 2% formaldehyde inhibitor, and 2% to 3% inorganic hollow microspheres, with the sum of the weight percentages of the above components being 100%; the formaldehyde emission of the composite material is less than 0.01 mg / m³, and the operating temperature range is -40°C to 85°C.

2. The weather-resistant modified PP-TPE composite material for vehicle storage as described in claim 1, characterized in that, The polypropylene is a copolymer polypropylene with a melt flow rate of 10 to 30 grams per 10 minutes; the thermoplastic elastomer is a polyolefin thermoplastic elastomer.

3. The weather-resistant modified PP-TPE composite material for vehicle storage as described in claim 1, characterized in that, The anti-aging agent is a compound of hindered amine light stabilizer and antioxidant, and the weight ratio of the hindered amine light stabilizer to the antioxidant is 1:1 to 2:

1.

4. The weather-resistant modified PP-TPE composite material for vehicle storage as described in claim 1, characterized in that, The toughening agent is an ethylene-octene copolymer.

5. The weather-resistant modified PP-TPE composite material for vehicle storage as described in claim 1, characterized in that, The formaldehyde inhibitor is an acylhydrazine-based formaldehyde scavenger.

6. The weather-resistant modified PP-TPE composite material for vehicle storage as described in claim 1, characterized in that, The inorganic hollow microspheres are hollow glass microspheres or hollow ceramic microspheres with a particle size of 20 micrometers to 80 micrometers.

7. The weather-resistant modified PP-TPE composite material for vehicle storage as described in claim 1, characterized in that, By weight percentage, it includes: 72% polypropylene, 18% thermoplastic elastomer, 2.5% anti-aging agent, 3.5% toughening agent, 1.5% formaldehyde inhibitor, and 2.5% inorganic hollow microspheres.

8. The weather-resistant modified PP-TPE composite material for vehicle storage as described in claim 1, characterized in that, The flexural modulus of the composite material is 1200 MPa to 1800 MPa, and the notched impact strength of the simply supported beam is 15 kJ to 30 kJ per square meter (design target value, subject to actual measurement of the sample).

9. The use of the weather-resistant modified PP-TPE composite material for vehicle storage as described in any one of claims 1 to 8 in the preparation of vehicle storage boxes, characterized in that, The vehicle-mounted storage box is injection molded from the composite material, with a wall thickness of 1.5 mm to 2.5 mm.

10. A method for preparing a weather-resistant modified PP-TPE composite material for vehicle storage as described in any one of claims 1 to 8, characterized in that, include: Weigh out the following components by weight percentage: polypropylene, thermoplastic elastomer, anti-aging agent, toughening agent, formaldehyde inhibitor, and inorganic hollow microspheres. The weighed components are mixed evenly in a high-speed mixer to obtain a premix. The premixed material is melt-extruded and granulated using a twin-screw extruder to obtain composite material granules; The composite material granules are injection molded using an injection molding machine.

11. The preparation method according to claim 10, characterized in that, The twin-screw extruder has a melt extrusion temperature of 180°C to 220°C and a screw speed of 200 rpm to 400 rpm.

12. The preparation method according to claim 10, characterized in that, The injection molding barrel temperature is 190°C to 230°C, and the mold temperature is 40°C to 60°C, resulting in a vehicle storage box with a wall thickness of 1.5 mm to 2.5 mm.

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