Preparing melt re-processable polymer from polyurethane material for making value added products, involves converting polyurethane material into powder form, adding depolymerization catalyst to powdered polyurethane material and heating powdered polyurethane material with stirring
	MARATHE D S; GADGIL J M; JOSHI P S
	2023-09-15
专利权人	JOSHIPSV CONSULTING SERVICES LLP (JOSH-Non-standard)
申请日期	2023-09-15
专利号	IN202321062281-A
成果简介	NOVELTY - Preparing melt re-processable polymer from polyurethane material involves converting the polyurethane material into powder form; adding 0.5- 5 wt.% depolymerization catalyst to powdered polyurethane material and heating powdered polyurethane material at 140-200 ℃ for 20-90 minutes (min) with stirring, where the depolymerization catalyst is acid, acidic oxide, basic oxide, and/or amphoteric oxide; adding 1-50 wt.% depolymerisation cum capping agent to the depolymerized material with continuous stirring and continuing heating for 30-90 min till the reaction mass starts softening; heating the softened reaction mass at 160-200 ℃ for 15-40 min; neutralizing the softened mass; and removing the softened mass mass from the reactor and cooling to room temperature to get the melt re-processable polymer, where the molecular weight of the resulting melt reprocesable polymer is varied by varying the amount of depolymerization catalyst, depolymerization cum capping agent and temperature conditions. USE - The process for preparing melt re-processable polymer from polyurethane material is used for making value added products and brings back waste flexible foam, rigid foam and polyurethane elastomer into the value chain. ADVANTAGE - The prepared melt reprocessable polymers provides single comprehensive process to produce final end polymer material grade with compounding stage included. The process requires low-cost equipment and hence less capital investment. The process requires low energy consumption and hence low conversion cost. The process utilizes internal friction heat generated thereby facilitating efficient heat transfer leading to lower energy consumption. The process has lower labor cost due to automation and fewer equipment required for the complete process. The process facilitates making of multiple polymer types broadly falling within polyurethane group and grades for various applications with the same equipment and process. DETAILED DESCRIPTION - Preparing melt re-processable polymer from polyurethane material involves converting the polyurethane material into powder form; adding 0.5- 5 wt.% depolymerization catalyst to the powdered polyurethane material and heating the powdered polyurethane material at 140-200 ℃ for 20-90 minutes (min) with continuous stirring, where the depolymerization catalyst is acid, acidic oxide, basic oxide, and/or amphoteric oxide; adding 1-50 wt.% depolymerisation cum capping agent to the depolymerized material with continuous stirring and continuing heating for 30-90 min till the reaction mass starts softening, where the depolymerization cum capping agent is fatty acid, and/or polyether-based polyol; heating the softened reaction mass at 160-200 ℃ for 15-40 min; neutralizing the softened mass; and removing the softened mass mass from the reactor and cooling to room temperature to get the melt re-processable polymer, where the molecular weight of the resulting melt reprocesable polymer is varied by varying the amount of depolymerization catalyst, depolymerization cum capping agent and temperature conditions.
IPC 分类号	B29B-017/00 ; C08J-011/02 ; C08L-075/04
国家	印度
专业领域	化学化工
语种	英语
成果类型	专利
文献类型	科技成果
条目标识符	http://119.78.100.226:8889/handle/3KE4DYBR/20380
专题	中国科学院新疆生态与地理研究所
作者单位	JOSHIPSV CONSULTING SERVICES LLP (JOSH-Non-standard)
推荐引用方式 GB/T 7714	MARATHE D S,GADGIL J M,JOSHI P S. Preparing melt re-processable polymer from polyurethane material for making value added products, involves converting polyurethane material into powder form, adding depolymerization catalyst to powdered polyurethane material and heating powdered polyurethane material with stirring. IN202321062281-A[P]. 2023.

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