PU-Reuse

Conventional PU-reuse methods


There are three basic ways to recycle polyurethane foam where only a chemical process can produce a product that can be recycled to the original application without quality losses having to accept. Below we present the most important recycling methods:

Mechanical recycling

The production of composite foam is a process in which ground polyurethane foam is mixed with a high performance binder to form blocks and sheets for new products.


Soft foam composite foam is the most popular way to recycle flexible PU foam and use it in a different and lower-quality application than the original one. The "composite foam" is made from polyurethane foam pieces and a binder to create a new flexible foam block, and is mainly used for under carpet upholstery, hidden upholstery and soundproofing applications. Composite foam has been used for decades and represents nearly 90 percent of the carpet underpadding market in the United States.


The production of rigid foam composite panels is a recycling process that utilizes polyurethane from various applications, such as automotive parts, refrigerators, and industrial trim, to produce panels and moldings that often contain a very high proportion of recycled material. Used polyurethane parts are granulated and mixed either with a binder or with fresh polyurethane and then molded under heat and pressure into sheets or moldings. The resulting products, similar to particleboard from wood waste, are used in furniture, flooring and sound insulation applications.


Pulverizing is a similar type of recycling and uses industrial polyurethane trim or post-consumer parts and grinds them in various ways to produce a fine powder. The resulting powder is incorporated into the system polyol at lower percentages to produce new polyurethane foam parts. The use of the powder increases the viscosity of the raw materials and significantly affects the properties of the final product, making it difficult to return higher percentages to the original application.

Chemical recycling

Acidolysis is a process in which carboxylic acids are used at high temperatures to chemically "break" the polyurethane chain and convert it back into reactive raw material that can be used for the same application. The process is particularly suitable for the reuse of flexible foams since the resulting recycled polyol has a very low OH number, which is a requirement for use in flexible foams.


Glycolysis is a similar process to recycle polyurethanes, causing a chemical reaction at high temperature using diols and producing recycled polyols containing portions of the original polyurethane chain. These polyols can retain the properties and functionality of the original polyols used for foam production and can be recycled to the same application.


The hydrolysis produces a reaction between used polyurethanes and water, resulting in polyols and various chemical intermediates. The polyols can be used as fuel and the intermediates as starting materials for various types of polyurethane. They have chosen a great option to integrate images and text into their website. Move the image in this container as you like, the text adapts automatically. You can view events / events, team members, new products and more easily and creatively. First, insert a picture from the picture selection and edit it just like other pictures in the system. For example, link the image to existing pages on your website, to the URL of a website, a popup, or a bookmark. After adding the image, add the text. The text can be an image description, but the image can only be used as a decoration. \ nYou have chosen an excellent option to integrate images and text into your website. Move the image in this container as you like, the text adapts automatically. You can view events / events, team members, new products and more easily and creatively. First, insert a picture from the picture selection and edit it just like other pictures in the system. For example, link the image to existing pages on your website, to the URL of a website, a popup, or a bookmark. After adding the image, add the text. The text can be an image description, but the image can only be used as a decoration.


Thermal recycling

This process would recover a large portion of the energy content within the polymer for the production of heat or electricity by incineration. Generally recommended for polymer waste that does not meet the criteria for other recycling processes.

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