Effect of High Temperature Weather on Dry Composite
Release time:
2020-10-09
Dry composite is affected by many factors, one of which is high temperature.
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Dry composite is affected by many factors, one of which is high temperature.
Effect of 1. High Temperature and High Humidity Weather on Dry Composite
Then, in many cases, a two-part reaction-type polyester or polyurethane-based binder is used for dry compounding. However, its performance is generally different from the choice of isocyanate, the molecular structure of polyester polyol, the degree of polymerization, the functional group and the mixing ratio. The two-liquid reaction is a crosslinking reaction between the main agent containing hydroxyl components at the end of the polymer and the curing agent containing isocyanate components in the molecular structure to form a polyurethane with high compactness. The curing agent containing iso-amino ester group has strong activity and can react with substances containing hydroxyl and amine groups, and the reaction rate is more than 10 times faster than that of the polymer polyester and polyurethane main agent. Such as methanol, ethanol, water and other amines and other substances. This is also the reason why most polyurethane adhesive manufacturers restrict water and esters in the instructions. Then in the dry composite process, the impact of high humidity on the composite is multifaceted, such:
1. The adhesive is not hardened enough, and the adhesive is still maintained after the composite is cured, resulting in a decrease in peel strength;
2. The light speed slows down, the initial adhesion force decreases, and it is easy to cause the foaming of the composite film;
3. high temperature cooking film bag, in the process of high temperature cooking bag broken phenomenon increased;
4. Solvent volatilization is not complete, compound film bag odor phenomenon increased;
5. When compounding, the foam phenomenon of the rubber disc increases, and the composite film is prone to spots, white spots and crystal spots, etc;
6. Composite film feel hard hair brittle phenomenon increased.
Yi Hai Packaging strictly controls the workshop environment according to the influence of the external environment, adjusts the workshop temperature and humidity according to the characteristics of different seasons, and reduces the quality risk caused by objective factors. In addition, there is a quality inspection link in each production link to ensure that the qualified rate of products provided to customers reaches 100.
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