Rubber moulding prodn. from scrap tyre powder - by heating in mould under pressure under specified condition

摘要

Articles are produced from recovered rubber by placing rubber powder obtd. from scrap tyres into a mould and heating the powder to 160-210 pref. 160-190 deg.C under a pressure of up to 500 pref. up to 200 bars for a period of time ranging from one to several mins. pref. 4-10 mins., this decreasing when the value of the other parameters increase. Prior to being put into the mould the powder is pref. mixed with 0.5-20 wt.% vulcanising agent. An accelerator is pref. also added in amts. corresponding to half that of the vulcanising agent. To prepare a flexible article a mixt. of 190 pts. rubber powder and 2-7 pts. vulcanising agent is pref. used and heating is effected at 180 deg.C under a pressure of 120 bars for 6 mins.