改性纳米CaCO3对涂布纸性能的影响

研究了纳米CaCO3、偶联剂改性纳米CaCO3及脂肪酸改性纳米CaCO3对涂布纸物理性能的影响。结果表明，含纳米CaCO3的纸张涂层具有较高的印刷光泽度和表面强度。表面改性对纳米CaCO3在涂布纸中的应用有重要影响。以偶联剂和脂肪酸改性纳米CaCO3替代普通CaCO3，涂布纸的平滑度、光泽度、及油墨吸收性都大大提高，尤其表面强度改善更为明显，表面抗水性增强，水滴接触角明显增大。随着改性纳米CaCO3用量在5％～20％范围内增加，涂布纸性能持续改善。

Influence of Modified Nanosized CaCO3 on the Properties of Pigment Coated Paper

A comparative study of the influence of nanosized CaCO3, modified nanosized CaCO3 and microsized CaCO3 on the properties of pigment coated paper was carried out. The results showed that unmodified nanosized CaCO3 replacing microsized CaCO3 in paper coatings contributes little to other physical properties of the coated paper except for improving the surface strength of the coated paper. It was inferred that surface modification process has profound effect on the application of nanosized CaCO3 in the coated paper. The properties of coated paper including roughness, glare, print gloss and ink absorption can be greatly improved when nanosized CaCO3 modified with coupling agent and fatty acid is added into paper coatings. Furthermore, it was found that there is great change of the interfacial wetability of the coated paper, the contact angle of water on the surface of the coated paper containing modified nanosized CaCO3 is higher than that on the surface of the coated paper containing unmodified nanosized CaCO3, which can be attributed to the great change of the great polarity of nanosized CaCO3. In addition, the pigment mixing experimental results proved that surface modification is the key factor to effectively apply the nanosized CaCO3 in the coated paper. With the increase of modified nanosized CaCO3 amount in the coated paper, the properties of the coated paper can be persistently ameliorated, which is not in accordance with the research result of other references.