When the two-component rubber is partially cured in the mixing process, the rubber produced by the rubber gun will be skinned or vulcanized. There are three main reasons for this phenomenon:
⑴ when the colloid color is black and the curing speed is fast, it may be due to the high proportion of component B and too much catalyst to accelerate the curing speed. At this time, it is necessary to properly reduce the proportion of component B and wash the crust or vulcanizate before construction;
(2) if the glue is slowly discharged during the gluing process, the mixing core may not be cleaned for a long time or not completely, and the colloidal crust blocks the pipeline. Therefore, it is necessary to clean the static mixer regularly.
(3) when there is no abnormality in the curing and rubber outlet speed, and the rubber is still crusted or vulcanized, the equipment may be shut down for a long time, the rubber gun is not cleaned or the gun is not cleaned thoroughly, so it is necessary to wash the crusted or vulcanized rubber before construction.
Generally speaking, the colloid itself has no bubbles, and the bubbles contained in the colloid are likely to be mixed with air during transportation or construction, such as: (1) the exhaust is not discharged completely when replacing the rubber barrel; (2) after the components are put on the machine, the pressure plate is not pressed down, resulting in incomplete bubble discharge. Therefore, the foam should be thoroughly before use. During use, the glue applicator should be operated correctly to ensure sealing, so as to prevent air from entering. If it is suspected that the product itself has bubbles, it can be judged by butterfly test. Headline Lai long