Preparation and application of cross-linked polyvinyl alcohol paper surface sizing agent
In order to improve the application performance of polyvinyl alcohol and starch as sizing agents on the surface of paper,Paper surface sizing agents(CPSn-PVA)with different degrees of crosslinking were prepared by using γ-glycidyl etheroxy propyltrimethoxy prop-ylsilane(KH560)and borax(STB)as crosslinking agents,and crosslinking modified starch(PS)and polyvinyl alcohol(PVA1799).The properties of the paper surface sizing agent were characterized by Fourier transform infrared spectroscopy(FT-IR),scanning electron micros-copy and stability testing,and the effects of the addition ratio of KH560 and borax on the performance of the paper surface sizing agent and the physical properties of the paper after sizing were discussed.The experimental results show that when the addition amount of borax is 0.1 g and the addition amount of KH560 is 3 g,the tensile strength of the adhesive film can reach 25.6 MPa,and the elongation at break is 326％.At the same time,the multi crosslinked PVA1799 paper surface sizing agent showed good application performance.Compared with the original paper,the paper's folding enderance,tearing index and contact angle increased by 6 700％,65.04％,and 89.7％respectively after sizing.
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