Brief introduction to performance of cooking resistant polyurethane adhesive

At present, the food packaging industry is booming and the demand for adhesives for composite films is increasing day by day. The composite film flexible packaging has the advantages of high strength, waterproof, shading, good airtightness, and heat resistance, and the packaged product can achieve the effect of preservation, color retention, and taste protection. Adhesives for composite films (dry method) include general-purpose adhesives (including anti-100°C boiled and sterilized adhesives), resistance to 121°C retort sterilization, and resistance to 135°C high temperature retort sterilization. In the domestic glue, the general-purpose glue basically meets the requirements of compound production, and the resistance to 135°C high-temperature cooking and sterilizing glue is less, and only special occasions are used. Domestic production of 121 °C cooking plastic is less. Some of them are imported from abroad. Most of them rely on foreign imports. Among them, Japanese AD 502/CAT 10 has the largest sales volume. Its stable quality, permanent fastness, and good resistance to content and properties. , Has become the main resistance to 121 °C retort sterilization, but its higher selling price. In view of the above, Guangdong Zhongtian Jintao Chemical Co., Ltd. developed a low-cost, 121°C-resistant boiled and sterilized laminating adhesive with a universal curing agent (TMP/TDI adduct). On the basis of a comprehensive analysis of domestic and foreign literature, through small-scale development, pilot scale-up, and composite application testing, the composite performance has reached a predetermined target. The company developed a retortable polyurethane adhesive to make PET/Al/CPP composite bags, and Loading hot and sour medium, the test shows that the composite performance is good, after cooking at 121 °C 40min peel strength to reach the level of imported plastic, basically to meet the market for this adhesive needs. After one and a half years of production, the performance was basically stable, and the sales price was reduced by nearly half from the import price, which was well received by users.


Author: Xu Meiqing