The rubber anti-corrosion lining has different working conditions and different rubber materials. Natural rubber has high mechanical strength and good comprehensive chemical properties. Among them, natural rubber soft rubber is resistant to most inorganic acids, alkalis and salts, organic alcohols, some organic acids and other oxygen-containing derivatives; the corrosion resistance of hard rubber is higher than that of soft rubber. Stronger, so natural rubber can be used to make rubber anti-corrosion linings. Appropriate use of reclaimed tread rubber in the formulation of natural rubber-based anti-corrosion linings can effectively reduce costs on the premise of ensuring product quality.
1. Tread reclaimed rubber/natural rubber combined to prepare rubber anti-corrosion lining formula
100 parts of natural rubber, 20 parts of reclaimed tread rubber, 5 parts of zinc oxide, 0.5 parts of antioxidant A, 0.5 parts of antioxidant D, 0.2 parts of paraffin wax, 7.5 parts of carbon black N330, 40 parts of barium sulfate, 10 parts of talcum powder, white 50 parts of mud powder, 20 parts of asphalt, 4 parts of calcium base ester, 2 parts of accelerator D, 1 part of accelerator DM, 25 parts of sulfur, 0.3 part of salicylic acid; total: 286 parts.
The rubber anti-corrosion lining prepared according to the above formula has good resistance to many media (except concentrated sulfuric acid and concentrated nitric acid).
2. Improve the corrosion resistance of tread reclaimed rubber/natural rubber anti-corrosion lining - formula design points
(1) Tread reclaimed rubber anti-corrosion lining vulcanization system: natural rubber/tread reclaimed rubber is vulcanized with sulfur, and the amount of sulfur should be increased as far as the hardness and other physical properties allow. Adhesive corrosion resistance. When the amount of sulfur is controlled at 25-30 parts, the corrosion resistance of the hard vulcanizate is good; when the amount of sulfur is increased to more than 50 parts, the chemical corrosion resistance of the natural rubber/reclaimed rubber anti-corrosion lining is obviously better than that of the soft rubber. In the formula of low-hardness anti-corrosion lining, the amount of sulfur should be controlled at 4-5 parts.
(2) Tread reclaimed rubber anti-corrosion lining filling system: When natural rubber/tread reclaimed rubber is combined to produce rubber anti-corrosion lining, it is recommended to use chemically inert fillers, which are not easy to react with chemical corrosive media, not easy to be corroded, and not water-soluble. Electrolyte impurities. Commonly used reinforcing fillers are carbon black, clay, barium sulfate, talc, etc., barium sulfate is the best acid resistance; calcium carbonate, magnesium carbonate and other fillers that are easy to chemically react with acidic substances should not appear in natural rubber / reclaimed rubber. Anticorrosive lining formula.
(3) Tread reclaimed rubber anticorrosive lining softening system: It is recommended to use softeners and plasticizers that are not drawn out by chemicals and are not easy to interact with chemicals
3. Specific methods to improve natural rubber/reclaimed rubber anti-corrosion lining
The corrosion resistance of rubber refers to its ability to resist the damage of corrosive media such as acids, alkalis, and salts. If the rubber is to be corrosion-resistant, it first needs to have good water resistance. When using natural rubber/tread reclaimed rubber 2ELYY311 and rubber to produce anti-corrosion linings, the following points can be considered: spraying with paraffin or coating the surface with PTFE to form an impermeable layer on the rubber surface to prevent or reduce chemical corrosion The diffusion of the chemical medium; the appropriate amount of additives that can react with the chemical medium are added to inhibit the chemical reaction rate; if necessary, the rubber can be chemically modified to improve the corrosion resistance of the rubber by changing the molecular structure of the rubber.
In actual production, when natural rubber/tread reclaimed rubber is used to produce rubber anti-corrosion linings, the amount of reclaimed rubber can be appropriately increased, and the editor will continue to discuss related issues with you later.
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