Abstract: High impact high modulus polypropylene (PP) was developed. Two kinds of PP blends with the best comprehensive performance were selected from several PP combinations. The effects of different toughening agents and their dosages, talc powders with different particle sizes and their amounts on the properties of modified PP were studied. The results showed that two kinds of PP (brand CL 5384A, 191) were used as the matrix resin, and the (ethylene/propylene/diene) copolymer (EPDM, grade 8150) was used as a toughening agent with a particle size of 4 μm and treated with a coupling agent. Talc powder is a reinforcing agent. When the mass ratio of PP, EPDM and talc is 58:18:24, the notched impact strength of modified PP reaches 41.07 kJ /m2, and the flexural modulus is 1.42 GPa. Tensile strength. It is 18.54MPa, which achieves the performance index of special materials for automobile bumpers.
Key words: polypropylene (ethylene/propylene/diene) copolymer talc impact strength flexural modulus
Polypropylene (PP) is the largest and fastest growing variety of plastics for automobiles. It has the advantages of low density, low price, good performance and easy molding. However, its shortcomings of low temperature brittleness and shrinkage lead to easy product. Deformation and poor impact resistance limit its application in automotive materials such as bumpers. For this reason, since the mid-1970s, relevant personnel at home and abroad have carried out a lot of research work on PP by chemical or physical modification methods to improve the performance of PP.
At present, the toughening modification of PP is generally carried out by adding a rubber-based polymer or a thermoplastic elastomer such as (ethylene/propylene/diene) copolymer (EPDM), a block copolymer of butadiene and styrene such as (styrene). /butadiene / styrene) copolymer (SBS), polyolefin elastomer (POE), etc., can significantly improve the impact properties of PP. EPDM modified PP due to low cost, easy molding process, flexible configuration Excellent performance and widely used. For the enhanced modification of PP, CaCO3 and talc powder are mostly used. Because of the high density of CaCO3, more talcum powder is used. In recent years, China has done a lot of research work on modified PP automotive materials and achieved certain results. The author mainly chooses a suitable rubber polymer and talc powder to toughen and strengthen the two kinds of PP with the best comprehensive performance, and finally achieve the car's notched impact strength, flexural modulus and tensile strength. Performance indicators for bumper materials.
in conclusion:
In the PP co-stick system of CL5384A, 191, 8150 type EPDM and talc powder with a particle size of about 4um coupling agent (NTC-201) were added. When the mass ratio of PP, EPDM and talc was High impact high modulus PP can be produced at 58:8:4. The notched impact strength is 41.07 kJ / m2, the flexural modulus is 1.42 GPa, and the tensile strength is 18.54 MPa, which achieves the performance index of the special material for automobile bumpers.
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