Stability of the GHD Latex Crosslinkable at Ambient Temperature

Abstract

Abstract: The GHD latex containing glycidyl methacrylate(GMA), hydroxyl methacrylate(HEMA) and dimethylaminoethyl methacrylate(DMAEMA), which is crosslinkable at ambient temperature, was synthesized. In the presence of the seed latex of methyl methacrylate(MMA)-butyl acrylate(BA)-GMA, the effects of the polymerization technology and the recipes on the process stability of the emulsion copolymerization(PSEC) of MMA-BA-HEMA-DMAEMA and the shelf life of the crosslinkable latex obtained were studied. PSEC and the shelf life are improved as more emulsifier is used. When the polymerization temperature is raised, PSEC becomes worse because the crosslinking coagulation is increased, but the shelf life of the latex becomes longer because of the smaller particles and the lower surface tension. Raising T_g of the seed polymer can depress the crosslinking coagulation during the copolymerization and improve PSEC. Increasing the content of HEMA and DMAEMA has little influence on PSEC but it reduces the shelf life of the latex. When the functional group is separated through the particle designing, the latex with acceptable shelf life is obtained. It was deduced that the crosslinking coagulation may be the key factor which determined the PSEC and the shelf life of the latex crosslinked at ambient temperature.

Key words: Self-crosslinkable latex, Emulsion Polymerization, Stability, Crosslinking coagulation

CLC Number:

O631

TrendMD:

YU Zhang-Qing, LI Bo-Geng, LI Bao-Fang, PAN Zu-Ren . Stability of the GHD Latex Crosslinkable at Ambient Temperature[J]. Chem. J. Chinese Universities, 1999, 20(6): 978.

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Stability of the GHD Latex Crosslinkable at Ambient Temperature

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