Polyurethane

Guichon manufactures valves specially adapted to Polyurethane production :

Tank Bottom Valve (602) (607), Piston Valve (606) (609), Gate Valve (702)

Tank bottom valve 607C
DN 3/4" to 14" PN 10 to 150
– Welded construction
– Stainless steel, duplex steel, nickel alloys and special alloys, Titanium, Zirconium
Piston sampling valve Type : 609C
DN 3/8" to 8" PN 10 to 400
– Welded construction
– Stainless steel, duplex steel, nickel alloys and special alloys, Titanium, Zirconium

Construction

  • Construction materials: Carbon steel, stainless steel, Duplex & Super Duplex, Titanium, Zirconium, Uranus® B6, Tantale, Hastelloy®
  • Construction methods: Fabricated (Welded), Cast, Solid

Uses

  • Service conditions: High pressure, High temperature, Low temperature, Abrasion, Corrosion, High viscosity, Vacuum, Reliability, Low acoustic signature, Dead space free
  • Types of fluids: Liquid, Slurry, Gas, Powder and powdery media, High viscosity fluids

FAQ - Polyurethane

Polyurethane – Uses of Polyurethane :

– Elastomers: Condoms, Surgical Glove
– Paintings for all types of surfaces
– Adhesives for outdoor use
– Fibers: Cushion, clothing, swim suit

Posted in: FAQ - Polyurethane

Polyurethane – Process de fabrication du Polyurethane :

Polyurethanes, also known as polycarbamates, are some of the most versatile polymers. First developed in late 1930s,they are used in building insulation, surface coatings, adhesives, and solid plastics. Polyurethanes can be produced in four different forms including elastomers, coatings, flexible foams, and cross-linked foams. Each one has specific uses based on theirs properties.

Polyurethanes are produced by reacting an isocyanate and apolyol of various types (most common isocyanates: TDI (toluenediisocyanate) and MDI (methylenebisdiphenyldiisocyanate); mostcommon polyols: PTMEG (polyetetramethylene ether glycol), PPG (polypropylene ether glycol)).

During this process, the raw materials are pumped from their own storage tank to a common mixing vessel kept under controlled pressure and temperature. Here, additives are incorporated in accordance with a specific recipe. The temperature control inside the reacting vessels is usually made by a recirculating system such as the one illustrated in figure 1.

Exemple de schéma de fabrication du Polyuréthane

Figure 1.Schematic of a high-pressure vessel with re-circulation system (a: feed tanks, b: metering pumps, c: mixhead, d: safety valve, e: recirculation throttle, f: low-pressure recirculation valve, g: filter, h: hydraulics for mixhead, M: drive motor)

Polyurethane foam is the most widely used flexible foam plastic. It is produced by adding a blowing agent such as carbon dioxide and methylene chloride. Hard polyurethane plastic can be formed if the polymerization reaction is carried out without blowing agent. In some applications, continuous systems are a good alternative to the batch polyurethane production process, as it can reduce the risk of failed batches.

Posted in: FAQ - Polyurethane

Polyurethane – Recommended valves :

Guichon Valves offers valves specially designed for viscous liquids and designed to minimize pressure drops and dead zones. Jacketed valves allow to maintain the fluid temperature to prevent solidification. Sealants (gaskets, seals, etc …) are selected to prevent pollution of the circulating fluid.

Posted in: FAQ - Polyurethane