Production of flexible polyurethane foam from scrap foam
การผลิตโฟมโพลิยูริเทนชนิดยืนหยุ่นจากเศษโฟมโพลิยูริเทนที่เหลือใช้
Adisai Rungvichaniwat, D. of Rubber Tech. and Polymer Sci., F. of Sci. and Tech., PSU.
Anuwat Saetung, D. of Rubber Tech. and Polymer Sci., F. of Sci. and Tech., PSU.
Corresponding e-mail : radisai@bunga.pn.psu.ac.th
Grant : Government budget
Published : The 1st Thailand Materials Science and Technology Conference, 19-20 July 2000,
Bangkok, Thailand
Key words : binder, scrap foam, rebonded foam, polyurethane foam, recycled foam
The process of making flexible polyurethane foam from scrap foam was studied. First, prepar-ing the polyurethane binder, by the reaction of toluene diisocyanate (TDI) and polyether polyol at 70-80oC for 3 hours. Second, scrap foams chopping into the size of 10 to 15 mm. were mixed with 10% w/w of polyurethane binder, compressed and then cured to set in steam. Various amount of free iso-cyanate (NCO) content in polyurethane binder (4, 8, 12, 16%), compression degree (50, 60, 70, 80%) of the original foam height, curing time in steam (15, 20, 25, 30, 35 minutes) were studied. It was
found that the higher free isocyanate content in polyurethane binder, the higher foam hardness was obtained. The higher compression degree, the resulting rebonded foam had better dimension stability and also the higher foam hardness. The sufficient curing time to obtain the best dimension stability of the rebonded foam was at least 20 minutes in steam and curing time did not affect the foam hardness significantly.
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