Starch adhesives have been used for more than ten years in the production of corrugated cartons. The main quality issue is that the adhesive strength is not high. The cartons have the phenomenon of opening glue; the high moisture content slows the drying speed of the cartons; the stability of the consistency is poor, and it is easy to produce condensation. Gel phenomenon. These problems are mainly caused by unreasonable factors in the traditional thermal process. The authors studied the catalyzed rapid cooling process. The LF high-strength fast-drying starch adhesives produced have greatly improved the bonding strength, drying speed, and storage stability. They can be used in the production of corrugated cartons and can also replace organic adhesives. For color box packaging production.
Production process conditions and process design
The reaction temperature is usually high and the reaction speed is fast. However, the oxidant H2O2 or NaClO is rapidly decomposed and fails due to heat, so the cold method is more reasonable than the thermal method. Cold production saves energy and reduces equipment investment. Therefore, as long as the drawbacks of the cold production cycle are solved, it has more advantages than thermal production.
One of the ways for the catalyst to solve the long production cycle of the cold process is to add an appropriate amount of inorganic iron salt as a catalyst, which can significantly increase the reaction rate between starch and oxidant at room temperature, and lower the reaction temperature by about 80°C of the thermal process. To normal temperature.
The practice of reaction pH shows that the rate of starch oxidation reaction is much faster than that of acidic solution, and the stronger the alkalinity, the faster the rate. When the oxidant type and amount are the same, the pH value is the decisive factor in the reaction rate, even in the presence of the catalyst. This is because starch molecules contain a large amount of hydroxyl groups (-OH), and hydrogen bonds are easily formed between hydroxyl groups, making it difficult to carry out oxidation reactions. After the addition of caustic soda, some of the hydrogen bonds were destroyed and the oxidation reaction proceeded smoothly. At the beginning of the reaction, the authors turned the reaction solution into strong alkaline instead of the traditional pH=9~11. The reaction only required 1h at room temperature, and the reaction rate of the specific heat increased by more than 2 times.
Replacement of organic adhesives for color box production Folding box industry generally uses organic adhesives such as polyvinyl alcohol or polyvinyl acetate (white latex), Shandong Huaguang Ceramics Group Packaging Co., Ltd. uses LF high-strength quick-drying starch adhesive instead of organic adhesives After the color box adhesion is very good, the product is not flat deformation, do not open the plastic, drying speed, pressing after 20min can be cut, automatic cutting production line normal operation, without a lot of manpower to open plastic box repair, labor productivity increased.
It can be seen that using LF starch glue instead of organic glue can save nearly one million yuan in one year. As the cost of adhesives is drastically reduced, the production cost of color boxes can be reduced, and the market competitiveness of enterprises can be improved.
The production of LF high-strength, fast-drying starch adhesives using the catalytic rapid cooling process has the following characteristics:
(1) LF starch adhesive has large adhesive force, fast drying speed and good storage stability; (2) production reaction speed is fast under normal temperature conditions, production cycle only uses 1h; (3) process is reasonable and simple, equipment investment is small, Energy conservation and convenient management; (4) No pollution of three wastes in the production process; (5) Low production costs.
At present, this technical achievement has passed the technical appraisal of the Shandong Provincial Science and Technology Commission, and it has reached the leading level of the same domestic technology, and won the third prize for scientific and technological progress in Shandong Province. It is believed that with the rapid development of the packaging industry, this technical achievement can play a positive role in the technological innovation of starch adhesives.
Production process conditions and process design
The reaction temperature is usually high and the reaction speed is fast. However, the oxidant H2O2 or NaClO is rapidly decomposed and fails due to heat, so the cold method is more reasonable than the thermal method. Cold production saves energy and reduces equipment investment. Therefore, as long as the drawbacks of the cold production cycle are solved, it has more advantages than thermal production.
One of the ways for the catalyst to solve the long production cycle of the cold process is to add an appropriate amount of inorganic iron salt as a catalyst, which can significantly increase the reaction rate between starch and oxidant at room temperature, and lower the reaction temperature by about 80°C of the thermal process. To normal temperature.
The practice of reaction pH shows that the rate of starch oxidation reaction is much faster than that of acidic solution, and the stronger the alkalinity, the faster the rate. When the oxidant type and amount are the same, the pH value is the decisive factor in the reaction rate, even in the presence of the catalyst. This is because starch molecules contain a large amount of hydroxyl groups (-OH), and hydrogen bonds are easily formed between hydroxyl groups, making it difficult to carry out oxidation reactions. After the addition of caustic soda, some of the hydrogen bonds were destroyed and the oxidation reaction proceeded smoothly. At the beginning of the reaction, the authors turned the reaction solution into strong alkaline instead of the traditional pH=9~11. The reaction only required 1h at room temperature, and the reaction rate of the specific heat increased by more than 2 times.
Replacement of organic adhesives for color box production Folding box industry generally uses organic adhesives such as polyvinyl alcohol or polyvinyl acetate (white latex), Shandong Huaguang Ceramics Group Packaging Co., Ltd. uses LF high-strength quick-drying starch adhesive instead of organic adhesives After the color box adhesion is very good, the product is not flat deformation, do not open the plastic, drying speed, pressing after 20min can be cut, automatic cutting production line normal operation, without a lot of manpower to open plastic box repair, labor productivity increased.
It can be seen that using LF starch glue instead of organic glue can save nearly one million yuan in one year. As the cost of adhesives is drastically reduced, the production cost of color boxes can be reduced, and the market competitiveness of enterprises can be improved.
The production of LF high-strength, fast-drying starch adhesives using the catalytic rapid cooling process has the following characteristics:
(1) LF starch adhesive has large adhesive force, fast drying speed and good storage stability; (2) production reaction speed is fast under normal temperature conditions, production cycle only uses 1h; (3) process is reasonable and simple, equipment investment is small, Energy conservation and convenient management; (4) No pollution of three wastes in the production process; (5) Low production costs.
At present, this technical achievement has passed the technical appraisal of the Shandong Provincial Science and Technology Commission, and it has reached the leading level of the same domestic technology, and won the third prize for scientific and technological progress in Shandong Province. It is believed that with the rapid development of the packaging industry, this technical achievement can play a positive role in the technological innovation of starch adhesives.
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