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摘要
The use of oily organic solvents in the production of water-resistant sandpaper causes the environmental problems. Meanwhile, phenolic resin adhesive will result in the shortcomings such as the brittleness of sandpaper. In order to solve these problems, the lignin modified phenolic resin was synthesized by adding toughening agents of polyethylene glycol (PEG) or polyvinyl alcohol (PVA). The lignin modified phenolic resin adhesive was prepared after ethanol dilution for water-resistant sandpaper. The water absorption, the mechanical properties and the grinding properties of modified resin roll-coated paper base were investigated. The results showed that the modified phenolic resin adhesive with solvent lignin and 1.0 wt% PEG 600 is good for low water absorption. The water absorption of the paper base was 0.035 g/(m2?s) with 130 min of the reaction time, 160 ℃ of the curing temperature and 10 min of the curing time. It was 20.45% lower than that of the paper base when the reaction time was 60 min. The wet tensile strength of paper base was 10.28 kN/m, and the z-direction tensile strength was 1 002.7 kPa when the reaction time was 150 min. They were 22.23% and 31.17% higher than those of 60 min, respectively. Paper base showed the lowest water absorption, the highest wet tensile strength and the moderate z-direction tensile strength, when 1.0 wt% PEG 600 was added and the solid content of modified resin was 25%. Water absorption, wet tensile strength and z-direction tensile strength were 0.036 g/(m2?s), 10.56 kN/m and 886.4 kPa, respectively. The phenolic resins were modified by adding 0.8 wt% and 1.0 wt% PEG 600 as toughening agents. The solid content of the modified resin after dilution was kept between 25% and 30%. The sandpaper was made from the paper base treated with the modified resin, and the standard aluminum bar was ground with the sandpaper. The sandpaper showed no tearing or peeling after grinding for 30 min which meets the qualification requirements.
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