Split-stream process for making nanocomposites

A technology of nanocomposite materials and cementing materials, applied in the field of low-permeability nanocomposite materials, can solve problems such as undesired gel formation, and achieve effective methods and low-cost effects

Inactive Publication Date: 2008-07-30
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the prior art typically processes a large portion of the polymers to be made into nanocomposites, since masterbatching often leads to undesired gel formation

Method used

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  • Split-stream process for making nanocomposites
  • Split-stream process for making nanocomposites
  • Split-stream process for making nanocomposites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0252] Polymer part 1: 4 grams of BIMS03-1 (10 wt% PMS, 0.8 mol% Br) were dissolved in 1000 ml hexane in a 2-liter reactor. The polymer cement was heated to 75°C for 2 hours. Separately prepare Cloisite Na + (2 g) and water as an aqueous slurry. An aqueous slurry of clay was added to the polymer cement under high shear mixing and 1 g of ethoxylated (5) cocoalkylamine (Ethmeen C / 15 obtained from Akzo Nobel) was added to obtain a stabilized lotion.

[0253] Polymer part 2: 46 grams of BIMS 03-1 (10 wt% of PMS, 0.8 mol% Br) were dissolved in 500 ml of hexane.

[0254] The cementitious material of polymer part 2 was mixed with the emulsion of part 1 in a high shear mixer for 15 minutes. The polymer / clay nanocomposites were precipitated by adding isopropanol and dried in a vacuum oven at 85°C for 16 hours.

Embodiment 2

[0256] Polymer part 1: 6 grams of BIMS03-1 (10 wt% of PMS, 0.8 mol% Br) were dissolved in 1000 ml of hexane in a 2-liter reactor. The polymer cement was heated to 75°C for 2 hours and 0.8 g of dimethylethanolamine (Aldrich) was added. The reaction was maintained at 75°C for 2 hours. Separately prepare Cloisite Na + (2 g) and water as an aqueous slurry. An aqueous slurry of clay was added to the polymer cement under high shear mixing and 1 g of ethoxylated (5) cocoalkylamine (Ethmeen C / 15 obtained from Akzo Nobel) was added to obtain a stabilized lotion.

[0257] Polymer part 2: 46 grams of BIMS 03-1 (10 wt% of PMS, 0.8 mol% Br) were dissolved in 500 ml of hexane.

[0258] The cementitious material of polymer part 2 was mixed with the emulsion of part 1 in a high shear mixer for 15 minutes. The polymer / clay nanocomposites were precipitated by adding isopropanol and dried in a vacuum oven at 85°C for 16 hours.

Embodiment 3

[0260] Polymer part 1: 6 grams of BIMS 03-1 (10 wt% of PMS, 0.8 mol% Br) were dissolved in 800 ml of toluene in a 2-liter reactor. Then, 0.8 g of dimethylethanolamine (Aldrich) was dissolved in 100 ml of isopropanol and added to the polymer cement. The reaction was heated to 80°C and held at 80°C for three hours. Separately prepare CloisiteNa + (2 g) and water as an aqueous slurry. The aqueous slurry of clay was added to the polymeric cementitious material under high shear mixing and 2 g of ethoxylated (5) cocoalkylamine (Ethmeen C / 15 obtained from AkzoNobel) was added to obtain a stable emulsion . The emulsion was mixed for 15 minutes.

[0261] Polymer part 2: 46 grams of BIMS 03-1 (10 wt% of PMS, 0.8 mol% Br) were dissolved in 500 ml of toluene.

[0262] The cementitious material of polymer part 2 was mixed with the emulsion of part 1 in a high shear mixer for 15 minutes. The polymer / clay nanocomposites were precipitated by adding isopropanol and dried in a vacuum oven...

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Abstract

The present invention is a process to produce a nanocomposite of a elastomer and organic clay, e.g. an exfoliated clay, suitable for use as an air barrier. The process can include the steps of: (a)contacting a solution (10) of butyl rubber in an organic solvent with a halogen (12) to form a halogenated butyl rubber solution (16); (b) neutralizing the halogenated butyl rubber solution; (c) functionalizing at least a portion (18). of the halogenated butyl rubber; (d) mixing a dispersion (22) of clay with the functionalized butyl rubber (18) to form a masterbatch (26) comprising a polymer-clay nanocomposite; (e) combining the masterbatch (26) with the rest of the halogenated butyl rubber solution (20) to form a second mixture (28); (f) recovering the nanocomposite from the second mixture (28). The nanocomposite so formed has improved air barrier properties and is suitable for use as a tire innerliner or innertube.

Description

field of invention [0001] The present invention relates to low permeability nanocomposites useful in air barrier layers, methods of making them, and their use in articles. Background of the invention [0002] Nanocomposites are polymer systems containing inorganic particles having at least one dimension in the nanometer range. Some examples of these are disclosed in US Pat. A common type of inorganic particle used in nanocomposites is phyllosilicate, which belongs to the general class of inorganic substances known as "nanoclays" or "clays". Ideally, intercalation occurs in nanocomposites where polymers are inserted into spaces or galleries between clay surfaces. Ultimately, exfoliation is desired, where the polymer is completely dispersed with the individual nano-sized clay platelets. Due to the general improvement in the air barrier qualities of various polymer blends when clay is present, nanocomposites with low gas permeability are desirable; especially dynamically vul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/34C08L21/00C08J3/22C08J5/10
CPCC08J5/005C08J2423/00C08J3/226C08J3/215C08K3/346C08J2323/28B82Y30/00C08K9/04C08L23/283
Inventor 翁卫青龚才国A·J·迪亚斯R·韦伯J·斯托克斯
Owner EXXONMOBIL CHEM PAT INC
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