The invention is directed to use of polystyrene wastes, such as Styrofoam wastes, and carbon nanofibers to produce a highly hydrophobic composition or composite that can separate oil and water.

The invention is directed to use of polystyrene wastes, such as Styrofoam wastes, and carbon nanofibers to produce a highly hydrophobic composition or composite that can separate oil and water.

A composition comprising a Lewis base containing depolymerization liquid and methods of using the Lewis base depolymerization liquid to depolymerize the polymer component of fiber reinforced polymers to form free fibers.

A composition comprising a Lewis base containing depolymerization liquid and methods of using the Lewis base depolymerization liquid to depolymerize the polymer component of fiber reinforced polymers to form free fibers.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

Disclosed is a preparation method of a renewable epoxy asphalt material and a regeneration process. The preparation method comprises: I Vanillin and 4-aminophenol are reacted in water with stirring to obtain VAN-AP; II. VAN-AP is mixed with epichlorohydrin, to which tetrabutylammonium bromide is added and heated at 80 to 90 C. for reaction; sodium hydroxide solution is then added dropwise for reaction; the mixture is concentrated to obtain GE-VAN-AP; III. Preheated asphalt is mixed with a polyetheramine curing agent and a polyetheramine accelerator to form component A; GE-VAN-AP is melted as component B; the component A is evenly mixed with the component B to obtain a renewable epoxy asphalt material. During the regeneration, the resin phase structure in the epoxy asphalt is gradually depolymerized, whereby asphalt regenerant is used to restore the properties of the aged asphalt phase and reshape the resin phase structure to complete the regeneration.

Disclosed is a preparation method of a renewable epoxy asphalt material and a regeneration process. The preparation method comprises: I Vanillin and 4-aminophenol are reacted in water with stirring to obtain VAN-AP; II. VAN-AP is mixed with epichlorohydrin, to which tetrabutylammonium bromide is added and heated at 80 to 90 C. for reaction; sodium hydroxide solution is then added dropwise for reaction; the mixture is concentrated to obtain GE-VAN-AP; III. Preheated asphalt is mixed with a polyetheramine curing agent and a polyetheramine accelerator to form component A; GE-VAN-AP is melted as component B; the component A is evenly mixed with the component B to obtain a renewable epoxy asphalt material. During the regeneration, the resin phase structure in the epoxy asphalt is gradually depolymerized, whereby asphalt regenerant is used to restore the properties of the aged asphalt phase and reshape the resin phase structure to complete the regeneration.

Polyesters formed from epoxy and anhydride monomers, where both the epoxy and anhydride monomers include a single, e.g., cyclic backbone, so that upon depolymerization degradation, a singular monomer results, both from the epoxy and anhydride portions of the polymer. In an embodiment, such backbone may include a phthalic or other aromatic structure having dicarboxylate groups or a cycloaliphatic structure having dicarboxylate groups. The polyesters can be degraded under mild conditions with an alkali metal carbonate or alkaline earth metal catalyst. Upon such depolymerization (e.g., transesterification), the single resulting phthalic, other aromatic, or cycloaliphatic monomer can be repolymerized to produce a new polymer. Where degradation is carried out in an unsaturated alcohol, the resulting depolymerization product may be photopolymerizable.

Polyesters formed from epoxy and anhydride monomers, where both the epoxy and anhydride monomers include a single, e.g., cyclic backbone, so that upon depolymerization degradation, a singular monomer results, both from the epoxy and anhydride portions of the polymer. In an embodiment, such backbone may include a phthalic or other aromatic structure having dicarboxylate groups or a cycloaliphatic structure having dicarboxylate groups. The polyesters can be degraded under mild conditions with an alkali metal carbonate or alkaline earth metal catalyst. Upon such depolymerization (e.g., transesterification), the single resulting phthalic, other aromatic, or cycloaliphatic monomer can be repolymerized to produce a new polymer. Where degradation is carried out in an unsaturated alcohol, the resulting depolymerization product may be photopolymerizable.

The purpose of the present invention is to provide a method for producing recycled pulp fibers such that articles using the recycled pulp fibers can easily achieve a uniform whiteness and users are not prone to feel psychological resistance to articles using the recycled pulp fibers. This method is described below. The method is characterized by involving: a step for supplying, from a mixed solution supply port (32) to a treatment tank (31), a mixed solution (51) which contains superabsorbent polymers and pulp fibers derived from multiple types of used sanitary products; a step for supplying an ozone-containing gas (53) from an ozone-containing gas supply port (43) to a treatment solution (52) inside of the treatment tank (31): a step in which, by raising the ozone-containing gas (53) while lowering the superabsorbent polymers and pulp fibers in the treatment tank (31), the ozone-containing gas (53) is brought into contact with the superabsorbent polymers and the pulp fibers, and the pulp fibers are bleached to form recycled pulp fibers; and a step for discharging the treatment solution (52) from a treatment solution discharge port (33), wherein the recycled pulp fibers have a 0-10 YI with respect to a standard white plate.