Polyurethane science and technology] Polyhexyl ester liquid reaction molding advantages

In the early 1970's Germany will custom polyurethane two-component liquid reaction molding technology, that is, RIM-PU technology commercialization to really promote the development of the custom polyurethane industry. Two-component rigid polyurethane liquid reaction molding process coup the traditional injection molding process, it does not need to be made of polymer materials into granular raw materials, and then by melt injection into the mold in the secondary molding (physical molding), but directly from the two-component liquid raw materials wash injection (injection) into the mold at room temperature at once to complete the gel, foaming reaction.

Today I would like to share with you: customized polyhexyl ester two-component liquid reaction molding technology why will become an epoch-making technology?

(1) Material properties

Customized polycellulose ester material itself has many of my traditional materials such as lemon glue, plastic, metal, wood, etc. can not be compared with the characteristics: light, high strength, aging resistance, wear resistance, biocompatibility, etc..

(2) Low mold cost

Today's society, the realization of industrialization of most products need molds, molds both to ensure product quality and improve production efficiency. Most of the traditional mold for the metal mold, its production cycle is long, the cost of expensive. Moreover, all kinds of products market requirements of its appearance and structure to change quickly. For the same product, and the need for sub-molds to adapt to market demand. The high cost, long lead time, and high amortization of mold costs in the product cost have hindered the development of many products.

Customized polyhexanes two-component liquid reaction molding technology better solves this problem. The two-component liquid reaction molding process uses a liquid feedstock with extremely low molding pressure, which reduces the construction requirements for the mold. Injection molds require a closing force of 2500 to 50001f (1tf = 9.8KN), while RIM-PU requires only 100tf to process most common products. Now, a fast, inexpensive resin mold making technology has been developed. Its cost is only a few to a few tenths of the metal mold. The compression strength of these resin molds can reach that of aluminum molds. The surface finish of polyurethane products made by resin molds is also very desirable. Recently, also developed 䒑 kind of polyurethane self-forming mold technology, that is, the first pouring of polyurethane elastomer material, the formation of polyurethane elastomer mold cavity, the second pouring of polyurethane hard foam material to the elastomer mold cavity, reaction molding, take out that is the polyurethane hard foam products. Therefore, resin mold technology and custom polyurethane elastomer mold technology have played an extremely important role in the history of custom polyhelium ester development. Compared with the traditional mold technology, resin mold technology and polyurethane mold technology can be said to be a revolutionary technology. Currently, it is used more successfully in the shoe industry, decorative building materials industry and other fields. Polyurethane even if the use of metal molds to do, the mold quality is much lighter than the general even plastic molds, the cost is only 1 / 3 ~ 1/2 of the general injection molds.

(3) High production efficiency and low investment cost of equipment

Customized poly helium ester two-component liquid reaction molding process, two-component liquid raw materials from the casting equipment according to a certain ratio, after mixing and homogeneous, wash injection into the mold cavity to chemical reaction molding. A combination of the old injection machine is equipped with a mold assembly line, which can realize continuous operation. For example, a 60-station rigid polyurethane sole production line can complete the continuous process of 120 molds in 3~5min. This continuous process includes: pouring liquid raw material into the mold, molding and demolding (taking out the product), spraying mold release agent, and pouring liquid raw material into the mold. Rigid polyurethane is cheaper to produce. Typically, the production of rubber tires is a complex process, often requiring the use of expensive equipment such as closed-cell mixers, calenders, extruders, and flatbed vulcanizers, and the vulcanization process can take up to 30-40 min. Custom polyurethanes do away with the above process altogether, requiring a simple rotational molding (or wash molding) operation, and can produce a new tire every 3 min. The customized polyurethane process eliminates this process altogether. In comparison with a traditional tire factory with the same production capacity, the investment can be reduced by 10% thanks to this high productivity, even though the cost of the two raw materials used in SITA is almost the same.