Method for recycling elastomers, recycled elastomers, and use of the recycled elastomers
AssigneesLuis Felipe Rodomonte de Souza, Leonardo Campos Rodomonte de Souza
InventorBernardo Barreto Alvarez
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Abstract
The present invention relates to a process for recycling solid waste from vulcanized elastomers based on sulphur or crosslinked with peroxides. In this context, the present invention proposes the recycling of said waste by means of radical de-crosslinking in the presence of ozone and de-crosslinking agents, without the use of high temperatures. The present invention also relates to recycled elastomers and the use of said recycled elastomers obtained by means of said process.
Claims21
A process for recycling elastomer waste, said process comprising:
- a) dissolving a de-crosslinking agent in a solvent and adding the solution formed to elastomer wastes, where the de-crosslinking agent is selected from peroxides, persulphates or mixtures thereof;
- b) stirring the combination of step a) followed by allowing said combination to rest;
- c) adding water;
- and
- d) adding ozone,
- where the solvent is at least one of toluene or xylene,
- the peroxides comprise at least one of benzoyl peroxide, dicumyl peroxide, oxybisperoxides, or mixtures thereof,
- the persulphates comprise at least one of ammonium persulphate, potassium persulphate, sodium persulphate, or mixtures thereof, and
- where, in step d), said ozone is bubbled for a period of time between 4 hours and 6 hours at a flow rate of 30 mg/L to 50 mg/L.
A process for recycling elastomer wastes, said process comprising:
- a) preparing a solution comprising water, a surfactant and a de-crosslinking agent and adding the solution formed to elastomer residues, where the de-crosslinking agent is a “reactive solvent”;
- b) stirring the combination of step a) followed by allowing said combination to rest;
- and
- c) adding ozone,
- wherein the surfactant comprises at least one of sodium lauryl ether sulfate, ethoxylated nonylphenols or mixtures thereof,
- the “reactive solvent” comprises at least one of acrylates or methacrylates represented by the formula (I), styrene, divinylbenzene, or mixtures thereof
- where R is hydrogen or CH3 and R′ is an alkyl group of 1 to 4 carbons, and
- where, in step c), said ozone is bubbled for a period of time between 4 hours and 6 hours at a flow rate of 30 mg/L to 50 mg/L.
Dependencies are inferred from the claim text.