Solvent-free compound glue does not dry, what's going on?
Solvent-free compound glue is not dry, mostly caused by the wrong ratio of glue mixing, uneven mixing of glue, and deterioration of isocyanate components in glue. How to solve it? This article analyzes separately. 1. The proportion of glue mixed is not correct Customers who are equipped with a glue machine pay special attention: the glue machine should be maintained and cleaned frequently and in a timely manner, especially the sealability of the glue machine is better, otherwise the isocyanate component will easily react with water vapor and deteriorate. If the ratio of the two components produced by the glue machine is wrong, it will cause the glue to not solidify and become sticky. The core of the glue machine is the glue pump. Whether it is a plunger pump or a gear pump, there will generally be an automatic alarm system for the disproportionate glue. Generally speaking, the new rubber pump will have no problem when it is used in the initial stage, but with the extension of the years, if the related maintenance and maintenance measures cannot keep up. Once there is a problem with the glue pump, the adhesive ratio is unbalanced without alarming, and there will be batch quality accidents. Generally speaking, as long as the ratio is determined, the refractive index of the glue immediately after mixing is fixed at a certain temperature. Although in actual operation, there will be some changes in the refractive index due to the influence of temperature and test time, but all are regular . The detection of the refractive index can be carried out at any time without affecting online production, and the operation is very convenient. Enterprises can judge the accuracy of the mixing ratio by detecting the refractive index. 2. Uneven mixing of glue The glue should be stirred well. Stirring until the glue is clear indicates that it is even, especially when it is manually stirred. 3. The isocyanate component in the glue deteriorates The isocyanate component in the glue easily reacts with the moisture in the air to make the glue ineffective, so this requires special attention during storage and use. Sometimes the aluminized material composite is sticky, but the transparent material composite has no similar problems. This is mainly due to the fact that aluminized materials have better hydrophilicity than transparent materials, and the moisture on the aluminized film reacts with the glue. It can be solved by increasing the amount of isocyanate components, or applying glue to the aluminized material will also be improved to a certain extent, and special attention should be paid to the storage and protection of the aluminized material, before opening the packaging.
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