Preparation and performance of epoxy resin modified with mercaptan polysiloxane

doi:10.19491/j.issn.1001-9278.2022.07.004

Abstract

Abstract:

In this article， a series of polysiloxane epoxy composites were prepared through physical mixing and chemical modification methods using epoxy resin （E51） as a base material， amino?terminated polyoxypropylene （D?230） as a curing agent， and mercaptan polysiloxane （PMMS） as a modifier. The chemical structure of the cured epoxy resins were characterized using attenuated total reflection infrared spectroscope and X?ray diffractometer， and their mechanical properties， thermal stability and anti?corrosion performance were investigated through tensile and impact tests， scanning electron microscopy， contact angle measurement， dynamic thermomechanical analysis， and neutral salt spray test. The results indicated that the cured epoxy resins exhibited better comprehensive properties that the conventional epoxy resin. The cured epoxy resins containing 1 wt% PMMS obtained tensile strength of 74.63 MPa， which was 13.5 % higher than that before modification. Compared to neat pure E51， the polysiloxane epoxy resins showed an increase in elongation at break by 40.2 % and in impact strength by 43.7 %. The contact angle of the cured epoxy resins increased from 72.8 ° to 100.3 °， their surface energy decreased from 39.4 J/m² to 17.4 J/m²， their water absorption rate decreased by 44 %， and their water resistance was enhanced greatly. In addition， their anti?corrosion performance and T_g were also improved.

Key words: mercapto, polysiloxane, epoxy resin, mechanical property, water resistance, corrosion resistance

CLC Number:

TQ323.5

TAN Liqin, LIU Weiqu, LIANG Liyan, WANG Shuo, FENG Zhiqiang, LIN Jiaming. Preparation and performance of epoxy resin modified with mercaptan polysiloxane[J]. China Plastics, 2022, 36(7): 21-29.

Figures/Tables 11

Fig.1. Preparation route of the cured polysiloxane epoxy resin

样品编号	E51 含量	D230 含量	PMMS 含量	SO 含量	DMAP 含量
E51	25	7.78	0	0	0
E51⁃D⁃PMMS⁃1 %	25	7.78	0.25	0	0.01
E51⁃D⁃PMMS⁃3 %	25	7.78	0.75	0	0.03
E51⁃D⁃PMMS⁃5 %	25	7.78	1.25	0	0.05
E51⁃D⁃PMMS⁃7 %	25	7.78	1.75	0	0.07
E51⁃SO⁃1 %	25	7.78	0	0.25	0
E51⁃PMMS⁃1 %	25	7.78	0.25	0	0

Tab.1. Feeding ratio of the cured polysiloxane epoxy resin

Fig.2. FTIR spectra of neat cured E51， PMMS and E51?D?PMMS?1 %

Fig.3. XRD patterns of neat cured E51 and E51?D?PMMS?1 %

Fig.4. Mechanical properties of the cured polysiloxane epoxy resin

Fig.5. SEM of fracture surface of the cured polysiloxane epoxy resin

Fig.6. Water contact angle and ethylene glycol contact angle of the cured polysiloxane epoxy resin

Fig.7. Surface energy and water absorption of the cured polysiloxane epoxy resin

Fig.8. 900 h salt spray test of the cured polysiloxane epoxy resin

Fig.9. tan δ of neat cured E51 and E51?D?PMMS?1 % composites

样品	T_g /℃	储能模量/MPa
样品	T_g /℃	-50 ℃	25 ℃
E51	75.0	3 326	2 702
E51⁃D⁃PMMS⁃1 %	74.6、94.3	3 922	2 924

Tab.2. DMA data of neat cured E51 and E51?D?PMMS?1 %

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