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                                                                                                      您現在的位置:網站首頁 > 新聞中心>環氧改性陶瓷涂料的固化程度取決于哪些因素?
                                                                                                      環氧改性陶瓷涂料的固化程度取決于哪些因素?
                                                                                                      點擊次數:1882 發布時間:【2019-06-13
                                                                                                         環氧改性陶瓷涂料的固化程度取決于哪些因素?
                                                                                                        環氧改性陶瓷涂料與溶劑型涂料相比,水性涂料的優勢顯而易見。如VOC低,氣味小,使用安全,可以水洗等等。水性環氧的形態樹脂通過不同的水性化途徑可形成三種水分散形態:①水溶性;②膠束分散型;③乳液。
                                                                                                        環氧樹脂自身為熱塑性的線型結構,受熱后固態變為液態,高粘度變為低粘度,只有與固化劑配合使用才具有實用價值 (純正的單組分水性環氧體系也需加入潛伏型固化劑)。因此水性環氧體系應包含水性環氧樹脂和水性環氧固化劑,同樣,它們分別通過不同的水性化途徑可形成三種水分散形態。
                                                                                                        環氧改性陶瓷涂料的固化程度取決于以下四個因素:
                                                                                                        1)相容性:水性環氧樹脂與水性環氧固化劑的相容性越好,越有利于固化劑微粒與環氧樹脂微粒相互內部擴散,有利于固化反應的進行;
                                                                                                        2)粒徑:環氧改性陶瓷涂料粒徑較小時,水性環氧樹脂與水性環氧固化劑分散相粒子能夠較充分地相互滲透到內核從而達到較*的固化程度;
                                                                                                        3)親水親油平衡值:水性環氧樹脂與水性環氧固化劑的親水親油平衡值接近,在水相中達到一致的共存 穩定狀態,如果差異較大,親水性較強的組分會逐漸聚集于水相中,從而導致樹脂相和固化劑相分離;
                                                                                                        4)分散均勻程度:在多相分離的狀態下,只有通過一定的機械攪拌作用, 才能將樹脂相和固化劑相均勻分布于水相中; (環氧在應用中攪拌混合均勻非常重要)(有些朋友在使用油性環氧過程中認為只要簡單攪拌甚至不攪拌也能 成膜,其實這存在很大的誤區,因為所使用的油性環氧是由固體環氧溶解而成如75%的E-20,即使不加固化劑,溶劑揮發后可形成很硬的干膜狀態,環氧改性陶瓷涂料但這種干膜是未經固化劑交聯固化的,受熱后變成液態,干膜毫無性能可言)
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