Introduction to polyurethane subway gate baffle
Basic information
Polyurethane products are chemical names, commonly known as PU products, PU sponge products, etc. in the industry or on the market. It is made by mixing and foaming domestic or foreign polyether (commonly known as white material) and MDI (commonly known as black material).

Product use
In subway gates, polyurethane materials are used to make baffles. In addition, PU products are widely used in car and bicycle seat cushions, various memory foam pillows, mattresses, waist pads, various personalized key chains, brand image LOGO dolls, simulated fruits, plants, bread, etc. in major sample rooms and exhibition halls. In terms of accessories, it can also be used for armrests of various types of seats and sofas, electrical insulation and heat insulation fillers for hardware accessories, ceilings and thermal insulation materials for decoration, etc.

Processing steps
Bulk wholesale or development
First determine the product picture, size, color, etc., make a prototype, develop a set of sample molds, create a satisfactory sample, and develop the number of molds according to the number of orders, produce products, and complete delivery.

Small batch orders
These are products cast in the company's existing molds. There is no choice for such products, and they can only be confirmed by looking at the company's molds.

Product characteristics and advantages
Basic characteristics
Polyurethane is mainly made of polyisocyanates (of which diisocyanates are more commonly used) and polyols through addition polymerization. No by-products are produced during the reaction, so the volume shrinkage is small, and the internal stress generated after the adhesive layer is cured is also small. The molecular chain of polyurethane adhesive contains a considerable number of urethane groups, and can also contain polar groups such as ester bonds, ether bonds, urea bonds, and allophanate bonds8.

Advantages
Excellent low-temperature bonding strength: It can be used for bonding components working below -253?. Among various structural adhesives working at low temperatures, it has the highest peel strength and shear strength.

Good wear resistance of the adhesive layer: Suitable for wear-resistant adhesives. There is a kind of wear-resistant adhesive for turbine blades that will add polyurethane.
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