New polypropylene products reported abroad include: m PP products with excellent overall performance and greatly improved optical properties; highly transparent products; high flow products that contribute to thinning and faster production cycles; and high-strength products. These new products will promote the development of the polypropylene market and become a new growth point for the market.
Metallocene catalysts provide new opportunities for polypropylene to replace other materials and open up new fields for the entry of metallocene catalysts into the polypropylene field. However, from the current market, the application of metallocene catalysts in the polypropylene field lags behind that of polyethylene, and the proportion of polypropylene produced with metallocene catalysts is still very small, and the application range is relatively narrow. In 1998, only 45,000 tons of polypropylene were produced from metallocene catalysts worldwide.
As development work continues, the application of metallocene polypropylene products will expand. The second-generation metallocene catalysts will produce new metallocene homopolymers, impact copolymers and random copolymer grades. These new products will Accelerate the development of the metallocene polypropylene market. It is estimated that by 2003, the world market for metallocene PP products will reach 500,000 tons.
Now m PP has begun to develop into the market of some general products. At the European Plastics Exhibition in 1998, some companies exhibited some novelty products made of metallocene polypropylene. Compared with polystyrene, the advantage of metallocene polypropylene in this field is that only one kind of material is used, which is favorable for recycling and reuse, and the lighter quality and lower production cost.
High transparency brand promotes the growth of polypropylene packaging market Various types of transparent polypropylene grades are a bright spot in the development of new polypropylene products in the world recently. Today, the optical properties of polypropylene resins are greatly improved compared with two years ago. Transparency grades will promote the replacement of polypropylene resins with other competing materials in the transparent packaging market, such as PS, ABS and PET. At present, the new high-transparency polypropylene resin obtains a transparent modifier mainly through 3 ways, and another kind of polypropylene product which has excellent transparency itself is a random copolymer.
Most of the transparent and glossy polypropylene products on the market today are produced using transparent modifiers such as sorbitol. The transparent modifier is also a nucleating agent. Adding 0.1% to 0.4% of transparent modification additive can not only improve the transparency of polypropylene, but also increase the rigidity and widen the melting range.
Another way to obtain a highly transparent polypropylene resin is a metallocene catalyst. If the transparency of PET is set at 100%, then 47% for highly crystalline polypropylene, 89% for polypropylene produced with nucleating agents, 93% for metallocene polypropylene, and the transparency of metallocene polypropylene random copolymers 96%.
High transparent grades will promote the replacement of other competitive materials with polypropylene resins in the transparent packaging market. Nowadays, transparently modified polypropylene products have already occupied a certain market in the field of blow-molded bottles for foods, cosmetics and pharmaceuticals, as well as in the fields of small parts, appliance parts and household appliances, as well as injection molding and thermoformed food containers. Injection, stretching and blow molding products are among the most promising markets for transparent polypropylene. Aqueous bottles made of transparent, modified polypropylene, processed by injection molding, stretching, and blow molding, have the same optical properties as PET water bottles. Transparent polypropylene has the potential to enter other fields after further improvement of barrier properties, such as soft drink bottles. In the hot-formed products market, newly developed high-transparency polypropylene homopolymers have higher impact resistance and better dimensional accuracy, and can be processed with existing thermoforming equipment, with the potential to penetrate the disposable cup market This market is currently mainly using PS/HIPS blends.
Demand for Polypropylene Continues to be Strong in the Automotive Industry Polypropylene continues to grow in the automotive market thanks to the fact that polypropylene is well compounded with a wide range of materials, capable of simulating high-priced engineering resin performance at a lower price, and being able to thin As well as reducing weight, etc., this makes polypropylene not only superior to alternative non-polymers, but also in competition with other polymers such as PVC, ABS, HDPE, and engineering plastics.
To reduce fuel consumption and vehicle weight, replacing more materials with other plastics is the future direction of the automotive industry. According to reports, each vehicle can now replace 200-300 kilograms of other materials with 100 kilograms of plastic. Accordingly, the average life span of 150,000 kilometer can reduce fuel consumption by 750 liters. Compared with the replaced material, the plastic has a lighter bumper of 10.4 kg, a lighter engine hood of 4.2 kg, and a lighter fuel tank of 5 kg. The chassis, drive system, and transmission system can also be designed due to the reduced support and driven components. Lighter.
Many car manufacturers are optimistic about polypropylene components. Automakers generally hope that automotive components can be manufactured from a single material to facilitate recycling, while also promising lower cost materials. In many cases, polypropylene is preferred because of its best overall performance. For example, DSM has developed a dashboard made from a single polypropylene material.
Reinforced/Filled Polypropylene Rapidly developed Polypropylene can be combined with various fillers such as short/long glass fiber, talc, mica, calcium carbonate, and the like. The reinforcement/filling polypropylene that can broaden the performance of polypropylene resin is developing very rapidly, and is mainly used in fields requiring high rigidity, especially high rigidity at high temperatures, such as automobiles, home appliances, office equipment, building materials, and the like. It is estimated that 25% of the polypropylene resin in the world is consumed by filling or strengthening.
The most important advancement in reinforcing/filling polypropylene is the use of new base resins in reinforcing/filling materials such as highly crystalline polypropylene, nucleating agent-produced polypropylene and metallocene polypropylene. The new base resin gives a higher level of performance in reinforcing/filling polypropylene. This type of brand has developed rapidly in Europe and is mainly used for car bumpers. The addition of fillers has some side effects. First, due to the higher density (generally mineral filler density is 2 times that of pure polypropylene), the meritorious deduction in the weight-reducing automotive market; second, some fillers (such as mica) Affects gloss, produces odor and reduces scratch resistance. New base resin can reduce the amount of filler. Thin-walled bumpers are a good example of new polypropylene products. The new polypropylene resin itself has higher hardness and toughness, so to achieve a certain hardness, the amount of mica added needs to be reduced. In other words, at the same amount of addition, components can be thinner, thus reducing costs and weight. When high-crystalline polypropylene is used to produce talc-filled automotive instrument panels and interior door panels, the talcum powder loadings are approximately 12% and 8% to 10%, respectively.
Polypropylene will grow in the market of thermoformed sheet and foamed products. With the development of new polypropylene products with high flow and high melt temperatures, polypropylene thermoforming packaging materials will grow rapidly. It is expected that the average annual growth rate of polypropylene thermoformed food packaging containers in the next 10 years will be 8% to 10%. Polypropylene currently accounts for 20% of the thermoformed food packaging market. Its advantages are: good barrier to oxygen, high softening point, more suitable for microwave ovens; lower density, with cost advantages. Compared with injection molding, the thermoformed products can be thinner, and the main markets are cooked food containers, milk cups, beverage cups, and the like.

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