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印刷包裝廠用的膠黏劑的分類

From:Buke printing factory of China步殼印刷包裝廠 | Author:China Bukeprinting factorybook0755 | Published time: 2020-07-23 | 550 Views | Share:
膠黏劑的品種繁多,用途各異,一般按照膠黏劑的基料性質來進行分類,分為有機膠黏劑和無機膠黏劑兩大類
印刷包裝廠用的膠黏劑的分類

膠黏劑的品種繁多,用途各異,一般按照膠黏劑的基料性質來進行分類,分為有機膠黏劑和無機膠黏劑兩大類

(一)有機膠黏劑汽

有機膠黏劑有天然膠黏劑和合成膠黏劑。
天然膠黏劑有骨膠、蟲膠、澱粉、糊精、松香等。合成膠黏劑品種很多,主要有樹脂型膠黏劑、橡膠型膠黏劑和混合型膠黏劑。天然膠黏劑常用於結紙張、木材和皮革等。天然膠黏劑的來源少,性能不夠完善,現在的使用量已大為減少。
合成膠黏劑發展很快,品種很多,性能也很優良。樹脂型膠黏劑的黏結強度高,硬度、耐熱、耐介質的性能都很好,但較脆,韌性和起黏性較差。橡膠型膠黏劑有很好的起黏性和柔韌性,抗震、抗彎曲性能比較好,但強度和耐熱性比較低。混合型膠黏劑是將樹脂與橡膠或多種樹脂、橡膠混合使用,相互摻混,既提高強度,又增加柔韌性。
合成樹脂型膠黏劑又可分熱固性樹脂膠黏劑和熱塑性樹脂膠黏劑兩大類。熱固性樹脂膠黏劑是通過加熱固化後成為堅硬的不熔的物質,再加熱不會變軟,如環氧樹脂、脲醛樹脂、不飽和聚酯樹脂、聚氨酯等。熱塑性樹脂膠黏劑加熱時會軟化,冷卻後變硬,有一定的強度,再受熱後又會軟化,如聚醋酸乙烯酯、聚氯乙烯、聚酰胺、聚乙烯醇等。

(二)無機膠黏劑

無機膠黏劑有磷酸鹽類膠黏劑、硼酸鹽類膠黏劑、硅酸鹽類膠黏劑。在包裝業中用得最多的是硅酸鹽類膠黏劑,例如硅酸鈉膠黏劑(也稱水玻璃)。

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