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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

Inactive Publication Date: 2006-02-01
R T VANDERBILT CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, when preparing latex dispersion masterbatches containing accelerators, antioxidants and metal oxides such as zinc oxide, frequent remixing is required, which is difficult and time-consuming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The present invention provides a latex compound comprising a natural rubber or a synthetic rubber material and an antioxidant comprising a zinc based synergist. The zinc based synergist may be selected from the group consisting of zinc 2-mercaptotoluimidazole and zinc 2-mercaptobenzimidazole, as well as combinations of these materials. The latex compounds may be cured without metal oxide, such as zinc oxide, and / or without zinc based accelerators. The invention further pertains to cured natural rubber or synthetic rubber material comprising the latex compounds, and curing systems and methods for curing the latex compounds without metal oxide and / or zinc based accelerators.

Description

Background of the invention [0001] technical field [0002] The present invention relates to latex compounds that can be vulcanized without the use of metal oxides and / or zinc based accelerators. The latex compound may contain a zinc-based antioxidant material that provides zinc to the compound. The present invention also relates to a method of vulcanizing latex films without the use of metal oxide and / or zinc based accelerators. [0003] Background technique [0004] Metal oxides such as zinc oxide can be used to vulcanize latex compounds. Specifically, metal oxides act as activators for the vulcanization system and donors for metal-chlorine crosslinks in polychloroprene. For example, zinc oxide is used as a donor for zinc-chlorine crosslinking in polychloroprene. Other metal oxides that can be used in vulcanized latex compounds include magnesium oxide and lead oxide. [0005] Zinc oxide has a specific gravity of about 5.5 and precipitates rapidly in aqueous dispersi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00C08L7/00C08K5/56C08J3/26
Inventor 罗伯特・托马斯・齐孔维克
Owner R T VANDERBILT CO INC
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