The thin-walled automotive modified material has a new modified base. 'We have independently developed the ultra-high-flow blue phase high-crystalline polypropylene special material PPH-MN90B, which has passed the China, the United States, the European Union and other countries and regions. Environmental Health Certification. ' On August 2, Cao Yuxin, a chemical process expert at Sinopec Luoyang Petrochemical Company, said in an interview.
According to Cao Yuxin, the thin-walled design of polypropylene auto parts has become one of the main directions for the development of automotive modification technology. However, thin walling does not mean the reduction of product performance, but rather the modification of the automotive itself. Higher requirements, materials must have higher fluidity, rigidity and toughness, but also have lower shrinkage and warpage.
At present, domestic and foreign R&D institutions and enterprises have carried out a large number of technical research around this field, but they generally use copolymerized polypropylene as the base resin. At the beginning of 2017, Cao Yuxin's expert studio innovated the use of homopolypropylene as a research product by studying foreign similar products. Basic resin, and established a joint experimental mechanism with downstream enterprises such as home appliances, automobiles, high-speed rail, etc. They started from a small test and continuously improved the design of optimized products to achieve stable hydrogen quality of propylene, high catalyst activity, uniform molecular weight control and ball. The crystal size is the same.
Cao Yuxin said: 'The biggest difficulty in producing this polypropylene special material PPH-MN90B is processing and process control. Luoyang Petrochemical adopts advanced catalytic technology and hydrogen modulation production process, and with special resin structure control and additive formula, The resin has low VOCs, low odor, low shrinkage and low linear thermal expansion coefficient. Its melting index is up to 100g/10min, and the flexural modulus exceeds 2000MPa. It provides excellent modified base for thin-walled automotive modified materials. '
Subsequently, they carried out multi-extrusion and thermogravimetric studies, and conducted comprehensive evaluations of products with downstream companies. The evaluation results show that PPH-MN90B has excellent comprehensive performance, no plasticizer, organotin, etc., limited substances. , stable quality, no degradation and small molecular precipitation, total volatile organic compounds (TVOC) less than 70ppm, odor level of 3.0, product processing performance and environmental performance stability.
Since the introduction of PPH-MN90B to the market in April last year, the products have been widely used in domestic and foreign food packaging, automobiles, high-speed rail and other fields, and were first tested on the aircraft at the beginning of this year. Currently, PPH-MN90B and the company's PPH -MN60 products have become the only polypropylene special materials in the domestic market that do not contain plasticizers and organotin.
'At present, PPH-MN90B has achieved stable production and supply. This raw material can significantly reduce the processing temperature, improve production efficiency, and the raw materials are more environmentally friendly and safe. The appearance of the finished product is also more transparent, which can fully meet the requirements of downstream customers. 'Cao Yuxin said .
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Driven by environmental protection and energy conservation, lightweight has become the trend of the world's automotive industry.
The light weight of the car is to reduce the vehicle's overall vehicle quality as much as possible under the premise of ensuring the strength and safety performance of the car, thereby improving the power of the car, reducing fuel consumption and reducing exhaust pollution.
Polypropylene is the most widely used plastic material in automobiles. It is used in large parts such as instrument panels, door panels, columns, bumpers, and sills. In response to the demand for lightweight, the thin-walled design of polypropylene auto parts has also become a car modification. One of the main directions of the development of sexual technology can reduce the thickness of interior and exterior trims of automobile bumpers, car door frame, instrument panel skeleton, etc. to 2.5mm or even lower.