一种新型含水的有机硅烷改性水性环氧树脂胶黏剂的合成制备OA

Using epoxy resin as the matrix,a condensation reaction was carried out between a small-molecule silane and the hydroxyl groups in the epoxy resin by chemical grafting method,introducing Si—O—C bonds and C—O—C bonds into the epoxy resin,resulting in the production of silane-modified epoxy resin(SE).Fourier-transform infrared spectroscopy tests confirmed the successful synthesis.Epoxy value test indicated that the epoxy value decreased by 0.12 mol/100 g compared with that before modification.Gel permeation chromatography analysis showed that SE had a number-average molecular weight of 311 g/mol,a weight-average molecular weight of 530 g/mol,a molecular weight distribution coefficient of 1.70,and a relatively uniform molecular weight distribution.Nonionic emulsifiers containing hydroxyl groups and water were added to SE.The mixture was transformed from an oil-in-water to a water-in-oil state via the phase inversion method,forming a uniform emulsion with a single-phase stable structure,namely,the silane-modified epoxy resin aqueous emulsion(WSE).The optimal formulation of the silane-modified epoxy resin aqueous emulsion adhesive was determined by adding different hydroquinone hydroxyl donors.Water retention analysis showed that hydroquinone had the highest water retention rate(11.2%)due to intermolecular hydrogen bonding.Thermogravimetric test and nuclear magnetic resonance hydrogen spectra confirmed that water existed in the form of structural water.High-speed stirring could reduce the emulsion droplet size to below 100 μm.The droplet size distribution was more uniform under the condition of 1 400 r/min and conformed to a normal distribution.