Vulcanizing latex compounds without the use of metal oxide activators or a zinc based accelerator
A composite and oxide technology, applied in the field of latex composites, can solve difficult, time-consuming and other problems
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Embodiment 1-3
[0024] Synthetic polyisoprene latex compounds containing the components shown in Table 1 were formulated according to methods known in the art. All components shown in Table 1 are expressed in phr. Example 2 is a comparative example comprising zinc oxide. The liquid dithiocarbamate (WB-7) used in the complexes listed in Table 1 was a mixture of NaDTC and NaMBT. What used in embodiment 3 is the aqueous dispersion system of 2-mercaptomethbendazole. It should be noted that, in Examples 1-3 and other examples in this specification, zinc oxide and sulfur may come from various suppliers. Zinc oxide and sulfur are commonly available commercially, and the source of these materials is not relevant to the function of the examples described, however, typically zinc oxide is purchased from Zinc Corporation of America, Monaca, PA, USA, and sulfur is typically purchased from Zinc Corporation of America, Trenton, NJ, USA. R.E. Carroll Inc.
[0025] Table 1
[0026] Ta...
Embodiment 4-8
[0029] Natural latex rubber compounds containing the components shown in Table 3 were formulated according to methods known in the art. All components shown in Table 3 are expressed in phr. Example 4 is a comparative example comprising zinc oxide. The liquid dithiocarbamate used in the complexes listed in Table 3 was WB-7, a mixture of NaDTC and NaMBT.
[0030] Films having a thickness of about 25 mils to about 40 mils were made from the composites of Examples 4-8. The films were vulcanized at 100° C. for 20 minutes, and then each vulcanized film was tested for tensile strength, 300% modulus and elongation using ASTM Test Method D412-98a (2001) el. The results are shown in Table 4.
[0031] Physical properties of samples without a zinc source (Example 6) and without a dithiocarbamate derived from a liquid dithiocarbamate (Example 7) according to tests on the vulcanized film The improvement is slower. Examples 6 and 7 were therefore no longer tested and considered.
[003...
Embodiment 9-13
[0037] Polychloroprene latex compounds containing the components shown in Table 5 were formulated according to methods known in the art. All components shown in Table 5 are expressed in phr. Example 9 is a comparative example comprising zinc oxide. Polychloroprene Neoprene from DuPont Dow Elastomers was used in the compounds formulated in Examples 9-13. The liquid dithiocarbamate used in the complexes listed in Table 5 was WB-7, a mixture of NaDTC and NaMBT. The thickener was Paragum 231 from Para-Chem and was added in an amount optimal for each application (e.g. test gloves, household gloves, thread, balloons, condoms, etc.) as understood by those skilled in the art. The amount required for viscosity.
[0038] Membranes made from the compounds of Examples 9-13 were vulcanized under the different conditions shown in Table 6. The vulcanization conditions are 30 minutes at 120°C and 45 minutes at 120°C. The tensile strength, 300% modulus, and elongation of each vulcanized f...
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