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Solveless polyurethane coating adhesive can only be applied to low-end packaging products at the beginning, but with the continuous advancement of domestic and foreign scholars' research work, through the modification of polyols to improve its heat resistance, water resistance, oil resistance, etc., so that this situation has been improved. The introduction of multi-functional substances can increase the crosslinking density of polyurethane composite film, thus improving the heat resistance.
Guangdong Xinhui Chemical Company used poly1, 4-butanediol adipate, castor oil and isophorone diisocyanate as raw materials to synthesize the A component of solvent-free adhesive, and modified castor oil with silane coupling agent to prepare modified castor oil (which can improve water resistance, cooking resistance and thermal performance) and added it to the B component of solvent-free adhesive. A kind of two-component solvent-free aluminum foil cooking adhesive resistant to high temperature 135℃ was obtained.
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