摘要：

分析了四硼酸钠交联剂对废聚乙烯醇（ＰＶＡ）薄膜制得的外墙涂料性能的影响，探索了交联机理。 实验比较分析了涂料改性前后的耐水性、耐碱性、耐洗刷性和耐沾污性。 利用 ＦＴ－ＩＲ 分析手段，对交联机理进行了探索。 结果表明：改性后涂膜的耐水性、耐碱性和耐洗刷性均明显提高；当交联剂浓度为 10％，外喷量为 180 mL /m^２  时，改性涂料的耐水性、耐碱性和耐洗刷性分别为2 280 h、768ｈ和5 100次，较对比试样分别提高了3 166.7％、2 133.3％和1 020.0％。 通过 ＦＴ－ＩＲ 分析可知，交联剂四硼酸钠中的硼离子与 ＰＶＡ 中的—ＯＨ发生缩合反应生成网状交联产物。

关键词: 交联改性, 涂料, 废聚乙烯醇, 资源化, 再利用

Abstract: The effect of sodium tetraborate used as crosslinking agent on the properties of the water-based coating based on PVA wastes was analyzed. The water resistance alkali re-sistance, scrub resistance and antifouling of the coatings before and after modification were in-vestigated. The crosslinking mechanism was also discussed via FT-IR. The results show that the significant improvement of properties of coatings modified with the crosslinking agent was observed. When the content of the crosslinking agent was 1. 0% and the external spraying a-mount was 180 mL/m, the water resistance, alkali resistance scrub resistance of the modified coatings were 2 280 hours, 768 hours and 5 100 times respectively, which were in-creased by 3 166. 7%, 2 133. 3% and 1 020. 0% respectively as compared to that of the con-trol samples. The FT-IR indicated that a condensation between sodium tetraborate and PVA occurred to form a crosslinking structure.

Key words: crosslinking modification, coatings, PVA wastes, recycling, reuse