When using latex reclaimed rubber to produce rubber compound, the company will perform rapid inspection of each compounded compound in the production process, in addition to regular sampling, in order to determine the main physics of latex reclaimed rubber compounds. Mechanical properties, timely detection of problems and timely remedial measures to ensure that latex reclaimed rubber compounds in the subsequent process performance and final product quality. The quick inspection method is to measure the plasticity, specific gravity, and hardness of the first, second, and later samples of the N-th rubber stock, and then compare them with the specified values. Other types of reclaimed rubber (such as tire reclaimed rubber, EPDM reclaimed rubber, nitrile reclaimed rubber, butyl reclaimed rubber) quality testing method consistent with the quality of latex reclaimed rubber testing methods.
Many customers who use latex reclaimed rubber to produce rubber products do not want to process their own compound rubber and choose to directly purchase latex reclaimed rubber compound rubber for post-processing. At this time, accurately determine the quality of the compounded rubber and the performance of latex reclaimed rubber products. The service life is of great significance. In actual production, the rubber compounds used in different latex reclaimed rubber products have a certain weight, plasticity, hardness, and specific gravity values when they are molded according to a well-designed formula and operation. This is also the detection of latex reclaimed rubber blends. The standards for the qualification of rubber compounding can only be used in the next step in the production of latex reclaimed rubber compound within the allowable range; if there is any discrepancy between the specifications, the use of the product will be suspended, and the problems should be identified and taken accordingly. The processing method.
After a problem occurs in the quality inspection of latex reclaimed rubber, it can be remedied by some measures instead of discarding it directly:
1, plasticity is too large or too small: If the material weight, hardness, specific gravity are normal, can be used in a small amount of normal rubber compound, or the larger and smaller blending can be used.
2, mixing uneven: should be added to the mixing, if the refining, the material weight, plasticity, hardness, specific gravity and other indicators are allowed within the allowable range of normal rubber can be put in use.
3, missing or more raw materials (material weight is too large or too small): This situation is more complex and should be handled according to specific circumstances. Generally can be adjusted according to the test results of physical and mechanical properties, and changed to low-grade rubber (such as pad with rubber or apex, etc.).
4. Scouring of rubber compound: Scorch is also called early vulcanization, that is, the partial vulcanization phenomenon should not occur before the curing process or during the revised draft. The performance on the surface of rubber or semi-finished products is elastic and sloppy, and the plasticity is significantly reduced. The load on operating equipment (open mill, extruder, etc.) is significantly increased.
The reason for the scorching of the rubber compound is that the mixing temperature is too high or too early to add sulfur, the accelerator dispersion is not uniform, the cooling is insufficient when the film is dropped, and the stacking site temperature is too high or the parking time is too long.
Scorch rubber processing:
A. For slightly scorched compounds, the roll temperature can be rapidly reduced to below 45 degrees, the roll distance can be reduced to 1-1.5 mm, and the compound can be thinned several times to allow it to cool and recover plasticity;
B. For the slightly scorched rubber compound, it is necessary to add 1-2% of stearic acid when it is thin-passed, and then add 10-20% of normal stearic acid after treatment.
C. For the rubber material with severe scorch, add 2-3% of oil softener after adding thin stearic acid. This can have swelling effect, and the treated material should be degraded. .
Hebei Hongyun Company has professional rubber technicians who can provide technical support and formula guidance free of charge. They can also contact various mixing rubber processing manufacturers for free. Rubber product manufacturers can use Hung Lai LaTeX reclaimed rubber with no worries.
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