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Improved natural rubber compositions

a technology of natural rubber and composition, applied in the field of natural rubber composition, can solve the problems of not being able to fully explore and exploit the potential of nanocarbon, and achieve the effects of long cure time, low heat build-up, and longer blow-out tim

Inactive Publication Date: 2015-07-23
AMRIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new rubber composition that uses both nanocarbon and carbon black as reinforcing agents in tires. The rubber and carbon black are mixed together in a specific ratio to improve processing and performance advantages such as longer cure time, longer blow out time, and reduced heat build-up. The rubber composition also shows desirable physical properties such as tensile strength and hardness. By using this particular mixture of nanocarbon and carbon black, the rubber composition has improved thermal and heat resistance properties, as well as reduced rolling resistance and increased resilience. The levels of carbon black used in the composition can be significantly reduced compared to standard rubber compositions, while still achieving improved processing and performance attributes. The rubber composition can also include certain vulcanization activating agents to accelerate the vulcanization process.

Problems solved by technology

Until recently it has not yet been possible to fully explore and exploit the potential of nanocarbon as a rubber reinforcing agent due to dispersion associated difficulties in processing.

Method used

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Examples

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process example

[0059]As described hereinbefore, nanocarbon may be pre-dispersed into the natural rubber according to the process described in Malaysian Patent Application ______ filing date YY / July 2012. Masterbatches suitable for use in the compositions according to the invention have levels of pre-dispersed nanocarbon contained within the rubber component produced according to this process of from about 1 to 10, about 1 to 8, about 1 to 6 or about 2 to 5 pphr nanocarbon. Process Example 1 illustrates the production of a 2 pphr masterbatch. Masterbatches containing other nanocarbon levels can be made via appropriate adjustment of the components.

Part 1—Preparation of Nanocarbon Slurry and Nanocarbon Dispersion

[0060]A 1% nanocarbon dispersion was prepared as follows: 3 g of nanocarbon was put into a glassbeaker (500 ml) containing 15 g of a surfactant and 282 g of distilled water. The mixture was stirred by means of mechanical stirrer at 80 rpm for about 10 minutes to obtain a nanocarbon slurry. Th...

example formulations 1 to 5

[0066]Formulations 1 to 5 are suitable for use in heavy duty vehicular applications such as truck and bus tire treads.

[0067]Formulations 3 to 5 are representative of the compositions of the invention and formulations 1 and 2 are comparative examples based upon a commercially available Standard Malaysian Rubber (SMR10). All components are expressed as pphr rubber, for example CNT MB 103 means that there are a pphr of CNT in 100 parts of rubber masterbatch MB (dried NR latex) and stearic acid “2” means that there are 2 parts of stearic acid per 100 parts of rubber.

Ingredients12345Rubber, SMR10100100———Rubber-CNT MB——*103——Rubber-CNT MB———*105**105Activator, Zinc oxide33333Activator, Stearic acid22222Antioxidant, 6PPD11111Carbon Black, N2205240353030Oil, Shellflex 250MB44444Accelerator, TBBS1.41.41.41.41.4Curing agent, Sulfur1.51.51.51.51.5Reinforcer, Silica (VN3)—12———Silica coupling agent, Si69—1.0———Polyethylene glycol, PEG—0.5———*Carbon nanotubes having a length of 85% and non-dete...

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Abstract

There is herein described improved natural rubber compositions having nanocarbon and carbon black as reinforcing agents wherein the nanocarbon is uniformly pre-dispersed within the rubber component. In particular there is described rubber compositions comprising a mixture of natural rubber, nanocarbon and carbon black wherein the relative amount in parts per hundred rubber (pphr) of nanocarbon to carbon black is in the range of about 1:40 to about 1:2 and the relative amount in parts per hundred rubber (pphr) of nanocarbon to natural rubber is in the range of about 1:100 to about 10:100 and wherein the nanocarbon component is pre-dispersed within the natural rubber component.

Description

FIELD OF THE INVENTION[0001]The present invention relates to improved natural rubber compositions. More particularly, the present invention relates to improved natural rubber compositions having nanocarbon and carbon black as reinforcing agents wherein the nanocarbon is uniformly pre-dispersed within the rubber component.BACKGROUND OF THE INVENTION[0002]The rubber industry is the second largest industry in the world after iron and steel, with 92% of global supplies of natural rubber from Asia, and its major use in commercial terms relating to the manufacture of tires with a recent projection of global demand to reach 3.3 billion units creating a market of $220 billion by 2012. As such, the drive to provide products for all sectors within this market, high-performance, heavy duty, automobile, truck, bus and such like is extremely high.[0003]Following the discovery of nanosized carbon structures, also referred to as nanocarbon / nanotubes, and their unique combination of extraordinary s...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K5/47C08K5/18C08K5/09C08K3/04C08K3/22
CPCC08K5/47C08K3/04C08K3/22C08K2003/2296C08K5/18C08K2003/045C08K5/09C08K7/00C08K2201/011C08K3/041C08K3/046C08L7/02C08L7/00
Inventor ISMAIL, SURINASAMSURI, AZEMI BIN
Owner AMRIL
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