Preparation and properties of TPEE/P（AA⁃co⁃AM） water absorbent elastomer

doi:10.19491/j.issn.1001-9278.2022.03.002

Abstract

Abstract:

To address the problems of low expansion rate in saline solution， poor saltwater absorption performance， and heat resistance of water absorbent elastomer （WSE）， a new type of polyacrylic acid acrylamide ［P（AA?co?AM）］ salt?resistant water absorption resin was prepared through reverse suspension polymerization using acrylic acid （AA） and acrylamide （AM） as monomers. A water?absorbent expansive elastomer based on the thermoplastic polyether ester elastomer （TPEE） and P（AA?co?AM） blend. The effects of monomer ratio of AA to AM and crosslinking agent （N，N’?methylene bisacrylamide， NMBA） content on the water absorption properties of P（AA?co?AM） were studied. Moreover， the water absorption properties and mechanical properties of WES prepared by self?made P（AA?co?AM） salt?resistant water absorption resin were investigated comparatively with a commercial water absorption resin， CPNaAA. The results indicated that P（AA?co?AM） exhibited optimal water absorption and water absorption performance at a mass ratio of AA to AM of 2.5∶1， a NMBA content of 0.05 wt%， a KPS content of 0.70 wt%， and a mass ratio of oil phase solution to water phase solution of 2.5∶1. The water absorption rate of P（AA?co?AM） to distilled water and brine was higher than that of the commercial water absorption resin. The increase of water absorption rate to brine was more significant. The TPEE/P（AA?co?AM） water?absorption expansive elastomer presented a fast water absorption rate at the initial stage， and its water absorption rate reached 80 wt% within 20 h. Then， the water absorption rate decreased gradually. The water?absorption expansive elastomer exhibited higher simultaneous water absorption rate， saturated water absorption rate， saturated water absorption time， the expansibility， extensibility， and flexibility after water absorption than those before water absorption. In summary， the TPEE/P（AA?co?AM） blend can act as a water?absorption expansive elastomer with excellent comprehensive performance.

Key words: water absorption resin, acrylic acid, acrylamide, thermoplastic polyether ester elastomer, water absorbent elastomer

CLC Number:

TQ325.7

HU Huanbo, WU Wei, LI Ning, ZHAO Tianyu, ZOU Zhiqiang. Preparation and properties of TPEE/P（AA⁃co⁃AM） water absorbent elastomer[J]. China Plastics, 2022, 36(3): 9-14.

Figures/Tables 8

Fig.1. Effect of AA∶AM monomer ratio on water absorption of P（AA?co?AM） copolymer

Fig.2. Effect of the content of NMBA crosslinking agent on water absorption of P（AA?co?AM） copolymer

Fig.3. Infrared spectrogram of P（AA?CO?AM） water absorption resin

Fig.4. SEM of PAA?co?AM water absorption resin

Fig.5. TGA analysis of PAA?co?AM water absorption resin

吸水树脂名称	溶液类型
吸水树脂名称	蒸馏水/g·g^-1	0.9 %NaCl溶液/g·g^-1
CPNaAA	422	61
P（AA⁃co⁃AM）	437	74

Tab.1. Comparison of water absorption rate of various absorbent resins

Fig.6. Absorption rate of the two absorbent expansive elastomers to salt water over time

吸水树脂名称	拉伸强度/MPa		断裂伸长率/%
吸水树脂名称	吸水前	吸水后	吸水前	吸水后
CPNaAA	8.12	6.72	212	466
P（AA⁃co⁃AM）	8.45	6.41	177	512

Tab. 2. Comparison of mechanical properties of two absorbent expansive elastomers before and after water absorption

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