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Detailed Explanation of the Preparation Method and Technical Key Points of Fish Scale Glue

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1. Process flow: fish scales → washing → alkali soaking → acid soaking → lime soaking → rinsing → glue boiling → filtration → coagulation → glue scraping → drying → finished product. 2. Process steps. After washing, the fish scales are soaked in a 5% caustic soda solution for about 5 minutes to remove grease and fatty skin and to make the scales swell. The alkali-soaked fish scales are immediately rinsed with water, then soaked in clean water to remove alkalinity until phenolphthalein no longer turns red. Next, the cleaned fish scales are soaked in hydrochloric acid, with the amount used starting at 12% (hydrochloric acid volume concentration 31%), then gradually decreasing, 8%, 3%,

1. Process flow: fish scales → washing → alkali soaking → acid soaking → lime soaking → rinsing → glue boiling → filtration → coagulation → glue scraping → drying → finished product.

2. Process steps. After washing, the fish scales are soaked in a 5% caustic soda solution for about 5 minutes to remove grease and fatty skin and to make the scales swell. The alkali-soaked fish scales are immediately rinsed with water, then soaked in clean water to remove alkalinity until phenolphthalein no longer turns red. Next, the cleaned fish scales are soaked in hydrochloric acid, with the amount used starting at 12% (hydrochloric acid volume concentration 31%), then gradually decreasing, with acid soaking carried out in 4 stages at 8%, 3%, and 1%, and the ratio of scales to water is 2:3. After the acid-soaked fish scales are rinsed, they are placed in limewater at 2 g to 4 g per liter and soaked for 7 days to 14 days to remove other impurities, then rinsed again with clean water. A small amount of hydrochloric acid is added to the washed fish scales to adjust the pH to 5-6. The fish scales treated as above are placed in a jacketed steam pot and heated at 60°C to 70°C for 2 hours to 3 hours until fully extracted. The boiled glue is filtered to remove impurities, and the transparent, clear glue liquid is placed in a fixed tray to coagulate naturally, then scraped with a scraper into sheets 5 cm thick; after the scraped sheets are dried, fish scale glue is obtained. Every 100 kg of wet scales can produce 10 kg to 12 kg of dry glue. Its uses fall into four major categories: photographic glue, biological glue, medicinal glue, and industrial glue, each with different quality standards.

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