Antiscorching Agent Silica
Molecular Formula: SiO2·nH2O
CAS NO.: 7631-86-9
Package: 25kg/bag
Storage Life: 12months
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Product Details ofAntiscorching Agent Silica
Description:
| Chemical Name | Silica |
| Molecular Formula | SiO2·nH2O |
| CAS NO. | 7631-86-9 |
| Package | 20-25kg/bag |
| Storage Life | 12 months |
Specification:
| Appearance | White Powder/Granule | ||||
Silica(Dry Basis)≥% | 98 | ||||
Type | S115 | S125 | S155 | S175 | S195 |
BET Specific Surface Area m2/g | 100-130 | 115-135 | 140-160 | 165-185 | 185-205 |
CTAB | 90-120 | 105-125 | 130-150 | 155-175 | 175-195 |
Bulk Density g/l | 190-260 Powder | ||||
PH value（10% aqueous solution） | 6.0-7.5 | ||||
Loss on Ignition(dry basis)% ≤ | 7.0 | ||||
Loss on Drying % ≤ | 4.0-8.0 | ||||
DBP Adsorption, cm³/100g | 200-300 | ||||
Residue (45μm ) %≤ | 0.50 | ||||
Cu Content, mg/kg≤ | 30.0 | ||||
Mn Content, mg/kg≤ | 50.0 | ||||
Fe Content, mg/kg ≤ | 1000.0 | ||||
%(Na2SO4) Soluble Salts%（in forms of Na2SO4）≤ | 1.6 | ||||
Thanks to the Mooney viscometer and vulcanizer, it is possible to measure both the newly mixed and remixed rubber materials at any time, so as to prevent the burning of the rubber materials.In the mass production of mixed rubber factory, there is no need for a comprehensive determination, only for the specified attention to the rubber can be used by a method of determination.Here's how to prevent it from burning.
First of all, to reduce the amount of vulcanization accelerator, but this will lead to the physical properties of rubber products decline, it is very important to understand this, vulcanization accelerator used alone is rarely, mostly is the use of two, three accelerators and the way.Once there is a problem with the coordination, it is not possible to prevent the rubber from burning. In general, the main stimulant used for general rubber is the pill or sulfonylamine stimulant.The main promoter DM is a universal promoter.The promoter M has a high scorchability, although the secondary sulfonphthalein amine accelerator has the scorchability, but because of the slow starting speed of vulcanization, it should be selected according to the requirements of the use of rubber.Muscle and thiuram are auxiliary promoters.In the high temperature season in midsummer, auxiliary promoter to reduce the amount of use, and the main promoter is as far as possible not to reduce its dosage.
The recycled rubber of 10-20 mass is added into the general rubber, and the rubber material is made by blending, which has the function of preventing burning.In addition, the additive formulation should be considered in the blend material design, and some necessary modifications should be made on the basis of the research on the physical properties of coke and vulcanizates.
In coordination with silica gel material, to add diethylene glycol, polyethylene glycol, organic amine accelerator SL.However, the addition of too much of the above will also lead to coking, so it must be noted.The standard dosage should be (compared with white carbon black) diethylene glycol and polyethylene glycol (molecular weight 400) 60%, organic amine promoter SL 2.5%.
In the aspect of coordination, although as mentioned above, made a lot of discussion, but if still can not prevent coking, can add anti-coking agent (vulcanization delay agent).Vulcanization retarders are organic compounds of anhydrous phthalic acid and benzoic acid, nitroso compounds and phthalamines.Nitroso - diphenylamine can not be used in light - colored rubber products because of its pollution.
The coke inhibitor also slows down vulcanization while delaying vulcanization because it reduces crosslinking, so do not use it in large quantities.In the authors' experience, the dosage should not exceed 0.4%.If it must exceed 0.4%, the amount of vulcanization accelerator should be reduced first.Do not use high promoter, high anti - coking agent method.
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