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Elastomer composite blends and method for producing them

A technology of elastomers and blends, applied in chemical instruments and methods, mixers, fluid mixers, etc., can solve the problem of reducing the molecular weight of a composition of natural rubber masterbatch

Inactive Publication Date: 2001-01-17
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prolonged and more intensive mixing using known mixing techniques and equipment, such as Banbury mixers, reduces the molecular weight of the natural rubber masterbatch-one composition

Method used

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  • Elastomer composite blends and method for producing them
  • Elastomer composite blends and method for producing them
  • Elastomer composite blends and method for producing them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] Test Methods

[0075] In the following examples and comparative examples, the following test methods were used.

[0076] 1. Bonded Rubber: A sample weighing 0.5g ± 0.025g was weighed and placed in 100ml of toluene in a sealed flask at room temperature for about 24 hours. The original toluene was then replaced with 100 ml of fresh toluene, and the flask was left for 4 days. The samples were then removed from the solvent and air dried in a fume hood at room temperature for 24 hours. The samples were then further dried in a vacuum oven at room temperature for 24 hours. The samples were then weighed and the bound rubber calculated from the weight loss data.

[0077] 2. MW sol : MW used in this specification and claims sol It refers to the weight average molecular weight of the sol portion of natural rubber. Standard GPC procedures for molecular weight determinations were performed as follows:

[0078] 2.1 Two 10 μm 10 from Polymer Laboratories, UK 6 Angstrom colum...

Embodiment A

[0107] Elastomer masterbatches were prepared according to the invention. In particular, an elastomeric masterbatch was prepared containing standard natural rubber field latex from Malaysia, and a filler consisting of 52.5 phr of commercial grade N234 carbon black obtained from Cabot Corporation. Table 1 below shows the properties of the natural rubber field latex.

[0108] Additives

% dry

rubber

%total

solid

%

Ash

nitrogen ppm

volatility

fatty acid

ML(1+4)

@100℃

[0109] 0.15% HNS a 0.3% NH 3 ,

ZnO, TMTD b

28.4

34.2

0.38

0.366

0.052

68

[0110] a. HNS: neutral hydroxylamine sulfate, Mooney viscosity stabilizer.

[0111] b. ZnO / TMTD: for biological preservation, typically 0.025% in a 1:1 mixture.

[0112] The full furnish formulation given in Table 2 below is typical of commercial truck tire tread formulations which ar...

Embodiment B

[0130] A control masterbatch was prepared by dry smelting. The control used the same formulation as in Example A (see Table 2 above), except that the natural rubber was SMR10 instead of latex. It was prepared by pre-mastication of the rubber with 10 phr carbon black at 50 rpm in a 0OC Banbury mixer (approximately 3 kg). Pre-fine refining for about 3 minutes, to a total of 800MJ / m 3 .

[0131] The contrast of embodiment A and embodiment B

[0132] The masterbatch of Example A and the control masterbatch of Example B were compounded and compounded in a two-step mixing operation in an OOC Banbury mixer (approximately 3 kg). Table 3 below lists the mixing scheme for the first step. It can be seen that an improved mixing scheme results from the masterbatch of Example A.

[0133] time (minutes)

Example A

Embodiment B dry mix control substance

0.0

all components

Pre-Mulched Rubber

0.5

carbon black and oil

1.0

sweep...

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Abstract

Elastomer composite blends are produced by novel wet / dry mixing methods and apparatus. In the wet mixing step or stage, fluid streams of particulate filler and elastomer latex are fed to the mixing zone of a coagulum reactor to form a mixture in semi-confined flow continuously from the mixing zone through a coagulum zone to a discharge end of the reactor. The particulate filler fluid is fed under high pressure to the mixing zone, such as to form a jet stream to entrain elastomer latex fluid sufficiently energetically to substantially completely coagulate the elastomer with the particulate filler prior to the discharge end. Highly efficient and effective elastomer coagulation is achieved without the need for a coagulation step involving exposure to acid or salt solution or the like. Elastomer composites are produced. Such elastomer composites may be cured or uncured, and combine material properties, such as choice of filler, elastomer, level of filler loading, and macro-dispersion, nor previously achieved. The coagulum produced by such wet mixing step, with or without intermediate processing steps, is then mixed with additional elastomer in a dry mixing step or stage to form elastomer composite blends. The additional elastomer to the coagulum may be the same as or different from the elastomer(s) used in the wet mixing step.

Description

field of invention [0001] The present invention relates to a new method for the preparation of elastomeric compositions, and novel elastomeric compositions obtained by these methods. More particularly, the present invention relates to methods for preparing elastomeric composite blends in which particulate fillers are finely dispersed in elastomers, and to these elastomeric composite blends such as curative-free and curative-containing compositions, And vulcanized rubber materials and articles formed from these compositions. Background technique [0002] Many articles of commercial importance are formed from elastomeric compositions in which particulate filler is dispersed in any of various forms of synthetic elastomers, natural rubber or elastomer blends. For example, carbon black is widely used as a reinforcing agent in natural rubber and other elastomers. Usually a masterbatch is prepared, ie a premix of filler, elastomer and various optional additives such as extender o...

Claims

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Application Information

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IPC IPC(8): B01F5/02B29B7/76B29B15/04B60C1/00C08C1/14C08C1/15C08J3/215C08J3/22C08K3/04C08K3/36C08L21/00
CPCC08K3/36B01F5/0256C08J2421/00B60C1/0016C08J2321/00C08K3/04B29B7/76C08J3/215B29K2021/00C08C1/14C08C1/15B29K2105/16B29B15/04C08J3/226C08L21/00B29B7/7495B01F25/23C08L2666/08
Inventor 梅林达·A·马布里王婷伊凡·Z·波多布尼克詹姆斯·A·谢尔阿伦·C·摩根钟斌时田升
Owner CABOT CORP
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