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Natural rubber produced from latex and composition comprising same

A technology of natural rubber latex and natural rubber, which is applied in the field of natural rubber and can solve problems such as time-consuming, difficulty in preparing masterbatch, and decreased durability

Inactive Publication Date: 2003-04-16
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the natural rubber obtained by the method as described above, the coagulation and drying steps are time-consuming, and there are also problems in the above-mentioned steps that the change in the quality of non-rubber components and the hydrolysis of phospholipids to fatty acids due to bacteria are accelerated , which degrades the physical properties of natural rubber
[0009] In addition, the methods of producing natural rubber by the above-mentioned methods also include the following problems: that is, a large amount of impurities are mixed in the coagulation-drying step, gelation is accelerated under the drying conditions for RSS production, and this process increases polymer density. The amount of gel makes the processing performance worse, and at the same time there is a problem that the molecular weight will decrease under the dry conditions of TSR production, which will have a negative impact on the properties of the rubber
[0010] In addition, when natural rubber is blended with aluminum hydroxide as an inorganic filler, especially when aluminum hydroxide is used together with silica, the degree of dispersion of the inorganic filler in the rubber decreases, making the resulting vulcanized rubber composition Abrasion resistance decreases when a large amount of silica + aluminum hydroxide filler is blended
This is due to the fact that aluminum hydroxide is prone to react with acids and bases and it is difficult to prepare a stable masterbatch
[0011] Also, in the case of using other inorganic fillers such as hydrated alumina, calcium carbonate, kaolin, clay, mica, and feldspar, there will be a problem that the durability decreases with the increase of the blending amount, which will reduce the vulcanization. Resistance to wear, cracking and crack growth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 5-8

[0187] In Example 5, the natural rubber latex collected after tapping was used and dried by a belt dryer at 130° C. for 1 minute to obtain natural rubber (DD-NR *2 ).

[0188] In Examples 6-8, add respective viscosity stabilizers to the natural rubber latex collected after tapping, the addition amount is shown in the following table 1, and the latex is passed through a belt dryer under the same conditions as in Example 5 above Dry to obtain natural rubber.

Embodiment 9-12

[0190] In Example 9, natural rubber latex collected after tapping was used and dried by a drum dryer at 120° C. for 30 seconds while forming it into a sheet shape, and then the flakes were dried by a drum at 120° C. Dry for another 1 minute to obtain natural rubber (DD-NR *3 ).

[0191] In Examples 9-12, each viscosity stabilizer was added to the natural rubber latex collected after tapping, and the addition amount is shown in Table 1 below, and the latex was dried under the same conditions as in Example 9 above to obtain natural rubber .

[0192] Measure the molecular weight of the various natural rubbers obtained above by the above method, impurity content, fracture resistance (T B ), modulus and viscosity stabilization effects.

[0193] The results are shown in Table 1 below.

[0194] comparative example

[0195] Example

[0196] Example

[0197] From the results of the above Table 1, it can be clearly found that compared with the nat...

Embodiment 13-15 and comparative example 3

[0202] Tread rubber compositions for truck tires were prepared according to blending formulations containing natural rubber and the like shown in Table 3 below. Blending units are in parts by weight.

[0203] General-purpose RSS#3 was used as natural rubber for Comparative Example 3.

[0204] The natural rubber used in Example 13 is obtained by mixing natural rubber latex (a product with the following solid content: DRC (dry rubber content) of 30%) without coagulation treatment with 15% carbon black (SAF) of the same weight in water The rubber clear was mixed by a mixer (mixing temperature: 25°C, mixing time: 1 minute), and then dried by a drum dryer (drying condition: 130°C, drying time: 20 seconds).

[0205] In Example 14, the natural rubber prepared by the following method was used in combination with the natural rubber prepared in Comparative Example 3, and the amount thereof was as described in Table 3 below. The method was to use natural rubber latex (containing 30 %DR...

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PUM

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Abstract

The present invention provides a natural rubber obtained by drying collected natural rubber latex without coagulation, wherein the drying is performed using a drum dryer and / or a belt dryer. In addition, there is provided a method of forming a natural rubber-filler mixture by adding at least one of carbon black and an inorganic filler to natural rubber latex, and adding a compound containing acyl to these natural rubber and natural rubber-filler mixture. A natural rubber of a viscosity stabilizer of a hydrazine compound or an ester of an aromatic or aliphatic polycarboxylic acid derivative, and a rubber composition prepared using the above natural rubber and having excellent productivity, abrasion resistance and fracture resistance.

Description

technical field [0001] The present invention relates to a natural rubber to which natural rubber skim has been added containing a variety of useful non-rubber components not normally The rubber has a high molecular weight and its polymer gel is reduced; the present invention also relates to compositions containing the above-mentioned natural rubber and by adding carbon black and / or an inorganic filler such as silica, alumina and Process for preparing natural rubber-filler mixtures from calcium carbonate. Background technique [0002] Typically, natural rubber is produced in tropical countries such as Thailand, Malaysia and Indonesia. Due to its excellent physical properties, natural rubber is widely used in large quantities in the rubber industry and the tire industry. [0003] Natural rubber is produced through the following steps: tapping—coagulation—cleaning (washing)—dehydration—drying—packaging and classification according to product type and grade. [0004] The foll...

Claims

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Application Information

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IPC IPC(8): C08K3/00B29B13/06C08C1/075C08C1/12C08K3/22C08K5/10C08K5/12C08K5/25C08L7/00C08L7/02
CPCC08K3/22B29K2007/00C08K5/10C08K5/25B29B13/06B29K2105/0064C08C1/12C08L7/02B29K2105/16C08L7/00
Inventor 虎谷博岁岩船盛一郎贵岛研前田弘实桥本隆次柳泽和宏
Owner BRIDGESTONE CORP
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