Fecha de publicación: 28/06/2019 Fuente: Wipo Olive Table The invention discloses an environment-friendly nontoxic swelling agent for the rubber sponge layer of a table tennis racket. The swelling agent is prepared from the following components in parts by weight: 30.0-50.0 parts of natural rubber, 20.0-30.0 parts of grease and 2.0-6.0 parts of initiator, wherein the initiator is a photo-initiator; and the grease is at least one or mixture of more components of seabuckthorn seed oil, soybean oil, grapeseed oil, macadamia ternifolia seed oil, simmondsia chinensis seed oil, meadowfoam seed oil, butyrospermum parkii, olive fruit oil, prunus amygdalus dulcis oil, avocado oil, hemoseed oil, crambe abyssinica seed oil, camellia oleosa seed oil, hydrogenated coco-glycerides, hydrogenated sunflower seed oil and cacoa seed butter in an arbitrary proportion. The swelling agent has a long service life due to the characteristic of oil absorbing and swelling of natural rubber, and can avoid rubber set breakage due to frequent replacing; and natural rubberand grease can be crosslinked and cured through the photoinitiator along with quickness, energy conservation and environmental-friendliness.