Compositions suitable for use in the vulcanization of rubber
A technology of composition and vulcanization accelerator, applied in the field of preparing these materials, can solve problems such as moisture absorption
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Embodiment 1
[0072] Example 1: Sodium-MBT in Fischer-Tropsch wax
[0073] One embodiment of the present invention is prepared by dissolving mercaptobenzothiazole as the accelerator of choice in a solvent mixture of ethanol and dichloromethane in a first vessel. Sodium hydroxide solution was prepared separately in pure ethanol as the source of selected cations. Dichloromethane was added to the solvent mixture of the dissolution accelerator to facilitate the dissolution of the mercaptobenzothiazole.
[0074] The two solutions were then mixed and heated at 39° C. to remove the dichloromethane-ethanol azeotrope (95:5 solvent mixture of dichloromethane by weight). Those skilled in the art will understand that the duration and temperature of the azeotrope removal process will depend on whether the process is carried out at atmospheric pressure or under vacuum conditions.
[0075] Silica is added as a solid particle base, and the reaction solution containing silica is mixed to wet the silica....
Embodiment 2
[0089] Example 2: Potassium-MBT in Fischer-Tropsch wax
[0090] The composition according to the invention can also be prepared by adding potassium or ethanolamine to MBT. For certain applications, it may be necessary to vary the actual amount of sodium-, potassium- or ethanolamine-MBT in the final wax composition of different activities.
[0091] Thus, one embodiment of the present invention is prepared by dissolving mercaptobenzothiazole as the accelerator of choice in a solvent mixture of ethanol and dichloromethane in a first vessel. Potassium hydroxide solution was prepared separately in pure ethanol as the source of selected cations. Dichloromethane was added to the solvent mixture of the dissolution accelerator to facilitate the dissolution of the mercaptobenzothiazole.
[0092] The two solutions were then mixed and heated at 39° C. to remove the dichloromethane-ethanol azeotrope (95:5 solvent mixture of dichloromethane by weight). The solutions were mixed in an op...
Embodiment 3
[0100] Example 3: Na-BEC, K-BEC and Ethanolamine-BEC in Fischer-Tropsch wax
[0101] One embodiment of the present invention is intended for use with zinc dibenzyldithiocarbamate (ZBEC) and tetrabenzylthiuram disulfide (TBzTD) type accelerator materials. In this case, some residual ZnO was formed in situ during the reaction of the zinc-containing feedstock.
[0102] Zinc dibenzyldithiocarbamate (ZBEC) was dissolved in the ethanol dichloromethane solvent mixture in the first vessel. Dichloromethane was added to the solvent mixture of the dissolution enhancer to help dissolve the ZBEC powder.
[0103] Ethanolamine is a liquid, while the other materials (Na, K) are supplied as solid hydroxides. It should be understood that the source of cations can be provided in any form, and its concentration can be adjusted appropriately.
[0104] The promoter fragment-containing solution and cation source solution were then mixed in an open beaker with magnetic stirring for 5 minutes and...
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Abstract
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Claims
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