Pore rubber
As the pore rubber , porous , i.e. H. understood numerous small gas bubbles containing rubber articles . They are usually produced with the addition of blowing agents .
Classification
According to their pore structure, they are divided into:
- Cellular rubber (completely closed pores)
- Foam rubber (largely closed pores)
- Sponge rubber (completely open pores)
Manufacturing
Cellular rubber
Cellular rubber is produced either by vulcanization in a nitrogen atmosphere, which is under high pressure, and relaxation shortly before vulcanization ( Pfleumer process ) or by using blowing agents from solid rubber .
Foam rubber and sponge rubber
Foam rubber and sponge rubber are produced from solid natural or synthetic rubber with propellants (propellant process) . The cross-linking of the molecular chains takes place chemically and (thermally) irreversibly. Materials based on thermoplastic elastomers (TPE) are not “rubber” in the true sense of the word, but have very similar properties and are therefore also called . Here, there is physical cross-linking of the molecular chains, which can be broken down again by the action of heat. This has great advantages in terms of processability and recyclability .
Foam rubber
Foam rubber is produced by whipping aqueous polymer dispersions (e.g. from polyurethanes ) into a foam and then vulcanizing it.
Individual evidence
- ↑ Entry on pore rubber. In: Römpp Online . Georg Thieme Verlag, accessed on January 7, 2016.