A new biodegradable environmental protection material-PBS
Poly (Butylene-Succinate) PBS polyester is a kind of aliphatic polyester synthesized by polycondensation reaction using aliphatic diacid and diol as raw materials. Its representative PBS is synthesized from succinic acid and butanediol as raw materials. In the 1990s, Japan's Showa Polymer Company first used isocyanate as a chain extender and reacted with a low molecular weight polyester synthesized by polycondensation of diacid diol to prepare a high molecular weight polymer. New biodegradable plastics have attracted widespread attention.
PBS entered the field of materials research in the 1990s and has quickly become one of the popular research materials for biodegradable plastics that can be widely promoted. It has good heat resistance, heat distortion temperature and product use temperature can exceed 100 ℃. The source of its synthetic raw materials can be either petroleum resources or biological resources. PBS is a leader in biodegradable plastic materials.
PBS has become the most industrially promising fully biodegradable plastic because of its excellent properties. In fact, the fully biodegradable plastics that have been developed so far have expanded from pure polyhydroxy fatty acid esters (PHB) to polylactic acid (PLA), polycaprolactone (PCL), and aliphatic glycols. Polyester (PBS), etc.
Among the fully biodegradable polyester materials, PBS is the most comprehensive and can be analyzed from the following aspects:
First, PBS-based polyesters have very good overall properties. The mechanical properties of PBS-based polyesters can not only meet the requirements for the use of general-purpose plastics, but also the PBS-based polyesters only degrade under the conditions of compost and other microorganisms, and the performance is very stable during normal storage and use.
Second, the processing performance of PBS is very good. It can be used for various types of molding processing on general processing equipment. It is the best processing performance of general-purpose degradable plastics at this time. This is crucial for the application of degradable plastics.
Third, PBS series polyester has excellent heat resistance. PBS is the best heat-resistant variety among fully biodegradable polyesters. The heat distortion temperature is close to 100 ° C, and it can exceed 100 ° C after modification. It can meet the heat resistance needs of daily products. It can be used to prepare hot and cold drink packaging and lunch boxes. . This has advantages over polylactic acid. The processing stability of polylactic acid and the heat resistance of the product are not very satisfactory.
Fourth, PBS-based polyesters have price advantages. It uses aliphatic dibasic acids and diols as main raw materials. After large-scale production, the price can reach the level of PET polyester. Relevant raw materials can also be produced by biological fermentation through natural products such as whey by-products in cheese manufacturing, natural polysaccharides such as glucose, fructose, lactose, maltose, mannitol, mannose, sucrose, xylose and cellobiose Succinic acid and butanediol not only come from nature, but also return to nature in a green cycle of production. It is also expected to further significantly reduce the cost of raw materials.
Fifth, PBS-based polyester production equipment has been localized. PBS polyester can be produced through slight modification of PET and PBT polyester equipment. At present, the production capacity of polyester equipment in China is severely excessive. The transformation and production of PBS provides new opportunities for excess polyester equipment.
Sixth, PBS-based polyesters are extremely versatile. It can be used in the packaging field, such as packaging films, lunch boxes, cosmetic bottles and pharmaceutical bottles, electronic device packaging, etc . it can also be used in disposable appliances, such as disposable food and beverage appliances, disposable medical supplies, etc. In addition, it can also be used It is used in agricultural fields, such as agricultural films, pesticides and chemical fertilizer slow-release materials. Finally, it can also be used in medical fields, such as biomedical polymer materials.