Page 51 - 《涂层与防护》2019年第7期
P. 51

涂层与防护
           第 40 卷第 7 期                                                                              Vol.40 No.7
                                                                                                       Jul.2019
           2019 年 7 月
                                                  COATING AND PROTECTION



            室温自交联水性丙烯酸树脂分散体的制备与性能

                                                        研究



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                                          袁东明 ，贾永高 ，杨天朝 ，张延强                   1
                    （1. 郑州中科新兴产业技术研究院，郑州，450000；2. 南阳星港涂料有限公司，河南南阳，474250）

                    摘要：水性丙烯酸树脂在耐光性、耐候性、色泽等方面显示了优良的性能，但是在成膜干燥速度、耐水
                性和储运稳定性等方面还存在明显不足。 针对上述问题，本研究以酮肼交联改性为基础，采用自由基共聚
                的方法，制备出了室温自交联水性丙烯酸分散体。 傅里叶转换红外光谱(FT-IR)分析证实了双丙酮丙烯酰
                胺（DAAM）和己二酸二酰肼（ADH）在室温下发生了酮肼交联反应，并对交联机理进行了研究； 差式扫描量
                热（DSC）分析表明，加入 DAAM/ADH 交联体系的树脂涂膜具有更高的玻璃化转变温度(T g )和热稳定性；在
                研究范围内，随着交联剂用量的增加，合成树脂的吸水率先降低后升高，交联度、硬度、断裂强度逐渐提高，
                伸长率降低。
                    关键词：水性丙烯酸树脂；酮肼交联；分散体；自由基共聚
                    中图分类号：TQ630.7          文献标识码：A         文章编号：1672-2418(2019)07-0035-06


                Preparation           and      Properties         of     Room        Temperature
                  Self-Crosslinking Waterborne Acrylic Resin Dispersion



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                            Yuan Dongming , Jia Yonggao , Yang Tianchao , Zhang Yanqiang    1
                (1.Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, China;2.Nanyang
                                  Xingang Coating Co. LTD, NanYang, Henan 474250, China)


                   Abstract: Waterborne acrylic resins have been widely used in the field of coatings for its
                excellent properties in terms of UV resistance, weatherability and color, etc. However, there still
                exists some obviously problems, such as the low drying speed of wet film, the low water resistance
                and storage stability, etc. In this article, the room-temperature self-crosslinking waterborne acrylic
                resin dispersions are prepared by the free-radical copolymerization method on the basis of ketone-
                hydrazine crosslinking. FT-IR analysis shows that the ketone-hydrazine crosslinking reaction occurrs
                between DAAM and ADH at room temperature. Besides, the mechanism of ketone -hydrazine
                crosslinking reaction is studied. The differential scanning calorimetry (DSC) indicates that the resin
                coating with DAAM/ADH has higher glass transition temperature  (T g) and thermal stability. In
                addition, with the increase of the amount of crosslinking agent, the water absorption of the synthetic
                resin decreases firstly and then increases. Meanwhile, the crosslinking density, the hardness and the
                breaking strength gradually increase while the elongation decreases.
                    Keywords： waterborne acrylic resin； ketone hydrazine crosslinking； dispersion； free radical
                copolymerization



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