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油墨的化學變化定做紙盒

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2021-04-20 | 896 Views | Share:
熱敏材料在一定壓力和溫度下,大都能發生分解反應而破壞原來的物理結構,使新的分解產物呈現不同的顏色達到變色目的,​反應過程有時會伴隨有氣體放出。

               油墨的化學變化定做紙盒


化學變化,改變了原來的物理化學性質,從而產生顏色變化,一般變化類型主要有升理
華、熔融、熱分解、氧化、固相反應等幾種情況:

升華反應:具有升華性質的某些變色顏料與填枓配合顯示一種顏色,當在一定壓力下加熱到一定溫度時,它會由固態分子變為氣態分子而逸出連結料,

脫離墨膜,此時墨膜只顯示填料的顏色,從而達到溫致變色目的。例如,選用靛藍做變色顏料,二氧化鈦做填料,以有機硅樹脂為連結料配成油墨。

240℃±10℃時加熱靛藍升華,墨膜由藍變白。升華是一種物理變化,因為當墨膜受熱時變色顏料逸出墨膜,而升華的顏料的化學
成分沒有改變。

熔融反應:熔融型溫致變色油墨是根據純結晶變色顏料在一定溫度下由有色的固態物質變為透明的液態物質而達到變色的目的,當然這種熔融要求變色明顯。

如使用硬脂酸鉛和乙基纖維素溶液研磨成白色色漿,噴塗或印刷在深色底材上形成白色塗層,當加熱到
100℃
時,白色硬脂酸鉛熔融而成透明的液體,

立即顯示出深色底材的顏色。熱分解反應:熱敏材料在一定壓力和溫度下,大都能發生分解反應而破壞原來的物理結構,使新的分解產物呈現不同的顏色達到變色目的,

反應過程有時會伴隨有氣體放出。如以碳酸鎘作為變色顏料,以改性環氧樹脂為連結料配製成油墨。墨膜在
300℃時碳酸鎘分解由白色變為黃色。

油墨的化學變化定做紙盒
油墨的化學變化定做紙盒


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