Synthesis of lanthanum tris (mono-i-octyl phthalate) and its thermal stability for polyvinyl chloride

Abstract

A novel type of thermal stabilizer—lanthanum tris (mono-i-octyl phthalate) (LTMP) was synthesized by double-decomposition reaction of sodium mono-i-octyl phthalate with lanthanum chloride at 60 °C. Sodium mono-i-octyl phthalate was prepared by sodium hydrate and mono-i-octyl phthalate prepared by reaction of isooctyl alcohol and phthalic anhydride in the presence of sulfuric acid catalyst at 110 °C. The yield of lanthanum tris (mono-i-octyl phthalate) is about 84.5%. Its thermal stabilities were measured by heat-ageing oven test when incorporated into PVC. The experimental results show that the heat stability time is about 40min at 190 °C when adding 3phr (per hundred resin) to PVC. The thermal stability of this product is better than that of Ca-Zn complex and basic lead salt stabilizers, and equal to that of dibutyltin diaurate.

Keywords

thermal stabilizer / lanthanum salt / synthesis / polyvinyl chloride

References

[1] Takata Y, Kunibe K. Stabilization of vinyl chloride resins with rare earth salt of organic acids [P]. JP, 7140421, 1971.

[2] Takata Y, Kunibe K. Vinyl chloride resin compositions[P]. JP, 8240539, 1982.

[3] DucrosP. Organo-rare earths—the newcomers in the organometallic world[J]. Journal Less-common Metals, 1985, 111: 37-37

[4] NarkhedeS N, BhattH A, KulkarniG S. New additives for PVC compound[J]. Pop Plast, 1975, 20(17): 15-15

[5] SHEN Jinwei, LIU Yuejian, LIU Yunjie. The influence of carboxylic ester rare earth salt on the rhetorical behavior of PVC[J]. Plastics Industry (in Chinese), 1993, (4): 52.

[6] ZHANG Yongxiang, LIU Shengtai. The development and applications of nontoxic rare earth stabilizers[J]. Plastics (in Chinese), 1986, (3): 7.

[7] LiuYuejian, ShenJingwei, LiuYunjie. Study on effects of carboxylic ester rare earth salt heat stabilization of poly (vinyl chloride) in processing[J]. China Plastics, 1993, 7(4): 51-51(in Chinese)

[8] LiuFang. Liquid rare earth stabilizer RE-120[J]. Plastics, 1990, 19(1): 11-11(in Chinese)

[9] YangZhanhong, ShuWanyin. Study on new synthetic technology of rare earth salts of fatty acid[J]. Rare Earth, 1997, 18(3): 61-61(in Chinese)

[10] HanHuaifen, QianJie, ZhongMingqiang. Effect of rare earth inorganic compound on heat stability of PVC[J]. Rare Earth, 1997, 18(3): 23-23(in Chinese)