Recycled plastic and natural rubber used in conjunction with the production of rubber products is a lot of rubber products companies to reduce costs, including many plastic sheet manufacturers. However, the use of natural rubber and tire reclaimed rubber used in conjunction with the production of plastic plate, reclaimed rubber mixed with too much, lack of natural plastic scorch, scorch time too fast, vulcanization pressure will cause the rubber surface uneven. Therefore, the design of the formula should be very careful to ensure that the rubber compounding, scorching time is reasonable.
Such as the recent visit of a rubber sheet customers have such a problem, his formula is as follows: natural rubber, 40 parts; reclaimed rubber, 60 parts; zinc oxide, 5 parts; stearic acid, 2 parts; sulfur, 2 parts ; Accelerator NOBS, 1; accelerator M, 1; antioxidant D, 1; carbon black: 15; pine tar, 25 parts.
He said that in the calender roll temperature of 70 degrees, the film thickness of 6mm, out of the film is not smooth; in the drum vulcanizing machine temperature of 150 degrees, the pressure of 17MPa, out of the plastic sheeting is not flat, and with the There are dry scars appear.
Our engineers give a few solutions to this:
1, when using the reclaimed rubber and producing the rubber sheet with natural rubber, the natural rubber should be masticated separately for two or three sections to ensure that it is fully masticated and kneaded evenly, and then added in the reclaimed rubber;
2, the recipe of carbon black N220 replaced by N550 try, compared with the N220, N550 easy to disperse, can give a higher stiffness of the rubber to ensure that the pressure out of rubber surface smooth, suitable for natural rubber and a variety of synthetic rubber;
3, Appropriate to join some tire rubber powder or inorganic spices, such as calcium carbonate, talcum powder;
4, adjust the curing pressure, appropriate to extend the scorch time, because these factors can also cause the rubber surface uneven.
If the above measures can not solve the film after the implementation of the problem of uneven, it should consider replacing the reclaimed rubber tires, tire reclaimed rubber quality too much, despite the "fairy" do our best, but also can not change the quality of reclaimed rubber caused Various problems.
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