Nye teknologier og anvendelser av polyuretanmaterialer og polyuretanprodukter

Polyuretanmaterials [that is, high molecular polymers containing urethane groups and -NHCOO in the main chain of macromolecules] have developed rapidly since the industrial production was not released on the market in the 1950s. Compared with polymer rubber materials, it has its own unique characteristics. It can use different numbers of functional groups and different types of functional groups according to different performance requirements, and use different production processes to produce polyuretan products with different properties and properties.

Among rubber rubber types, there are polyuretan rubber varieties that can be cross-linked. There are also those that are not in the category of rubber, such as foam plastics, rigid plastic products, coatings, high resilience synthetic fibers, artificial leather, adhesives, and so on.

Polyuretanmaterialer er for tiden mye brukt på forskjellige felt. For eksempel i luftfartsindustrien er hardprodukter, myke produkter og skumprodukter lettere enn metallmaterialer, [veldig viktig for fly], og har høy motstandskraft og ikke-brennbarhet. , Høystyrke, ultra-lav temperaturisolasjon, etc., som brukes til flyhetter, hastighetsbremser, radomer, flydrivstofftankfyllere, drivstofforbrukskontroll fordamper bøyer, etc., samt forskjellige støtterammer og seteputer for innredning . Det brukes til varmebehandling i transportindustrien.PolyuretanMaterialene er uatskillelige fra materialer og seteputer, produksjon av hjemmemøbler og til og med avanserte voksne kondomer og dekk. Og den siste utviklingen og bruken av produkter innen bilstøtdemping og dempingstilbehør har tiltrukket seg mer oppmerksomhet.

Although there are many types of polyuretan products, the classification of its products is nothing more than:

Flexible foam products, rigid products, and elastomers [thermoplastic elastomers, vulcanizable elastomers EU, AU]. The product molding equipment, such as mixing polyuretan rubber, is generally solid and can be vulcanized with sulfur, peroxide, and polyisocyanate. It can be designed according to the conventional rubber product production process and formula. If it is a thermoplastic elastomer, it can be injection or compression molding. If it is a plastic polyuretan, det kan produseres ved en støpemetode. tar fleksibelpolyuretan foam products as an example, the composition of the formula, the main reactants of which are polyether, polyester, or other polyols; and polyisocyanates. Others include water [chain extender], crosslinking agent, catalyst, foam stabilizer, external blowing agent, flame retardant, mold release agent, coloring agent, etc. The production process is generally two-component liquid reaction molding. That is to say, one group is that the polyol polymer and the isocyanate are mixed and reacted first, and then the above reactants are mixed with another group including water, blowing agent, stabilizer, catalyst, and various auxiliary agents to produce organic carbamate. At the same time, the reactants such as urea group use the reaction to generate carbon dioxide, release a large amount of heat, vaporize the added blowing agent, and then use the catalyst to adjust the foaming speed, and finally complete the product with uniform foam structure. At present, the automobile manufacturing industry has continuously improved safety, comfort, and durability, and has high requirements for durability in high-strength working conditions of shock-absorbing and damping elastomer parts. A new type of shock absorber made of polyuretan flexible foam has appeared in foreign markets. Its physical and mechanical properties and damping effect are slightly better than rubber damping accessories. The product requires a density of 0.08g 丿cm3, a material compression of 5%, a compressive strength of more than 7Kpa, the product works normally at -20-40 "degrees", the product's compression set is not more than 10%, and it has oil resistance. Under pressure impact, no fracture occurs. The production process is not special. The key lies in its main reaction material. Currently, BASF is monopolizing the production and supply. BASF also learns from DuPont's market supply principle of perfluoroether rubber, which is to sell only finished products, not raw materials. , In order to achieve the reduction of market competitors.

Denne nye typenpolyuretanfleksibel skumbil støtdempende deler vedtar en avansert "ett-trinns" støpeprosess, det vil si alle komponenter i råvarene i formuleringen, for eksempel isocyanat, polyolpolymer, kjedeforlenger, katalysator, skumstabilisator og andre Hjelpemiddel måles i henhold til formelen, med isocyanat som en separat komponent, og forskjellige hjelpemidler som polyolpolymer, vann, tilleggsblåsemiddel, kjedeforlenger, overflateaktivt middel, katalysator, etc. forberedes til en komponent, og deretter en gang tilsettes den til reaksjonstanken og tilsett skummidlet etterpå. Etter omrøring og blanding med høy hastighet utføres skummingsreaksjonsprosessen. Denne ett-trinns produksjonsprosessen er spesielt egnet for behandling av tilbehør med komplekse former og små spesifikasjoner. I støpemetoden injiseres den blandede væsken direkte i en form med en komplisert form, og deretter skummes det i formhulen for forming. Produkter laget av denne metoden. Spesifikasjonene og dimensjonene er nøyaktige, og det kan også brukes som metallinnlagte produkter etter behov.

Polyuretanproducts are currently widely used and the market demand is also large. Although my country started late, it has developed rapidly. Its global market share has reached more than a quarter. It has become the world's largest manufacturing and consumer market for polyuretan products. However, there is still a gap between the key main reaction materials and the advanced foreign level, and the industry needs to work hard to innovate and develop.It is reported that retreading tires with polyuretan material as tread rubber has better wear resistance and environmental protection than natural rubber. This innovative research and development has opened up a new way for retreading. During the "13th Five-Year Plan" period, the polyuretan industry will have more room for development.