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Rubbery product or rubbery substance containing product

A technology of rubber-like products, which is applied in the field of rubber-like products or products containing rubber-like materials, can solve the problems of insufficient heat resistance and weather resistance, and achieve low temperature resistance and excellent mechanical properties, excellent low temperature impact resistance, The effect of excellent heat resistance and weather resistance

Inactive Publication Date: 2007-01-03
NITTA CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these latex products are typically deficient in heat resistance and weather resistance, and these properties are in great need of improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Dissolve 140g solid natural rubber in 6.86kg toluene [trade name "SMR-CV60", natural rubber originating in Malaysia, 130×10 4 The weight average molecular weight (Mw), and the molecular weight distribution (Mw / Mn) of 5.7]. The molecular sieve was put into the solution, the mixture was allowed to stand for a day to remove water, and then the molecular sieve was removed therefrom by filtration. Filtrate and 8g catalyst [RhCl(PPh 3 ) 3 ] into the autoclave. After replacing the inner atmosphere of the autoclave with hydrogen, hydrogen was injected into the autoclave (8 MPa), the temperature was raised to 70° C. to 75° C., and a hydrogenation reaction was performed with stirring for 96 hours. After the reaction, methanol was added in small portions to the solution until the solid rubber was completely precipitated. The solid was filtered and washed with methanol. After repeating the filtration and washing steps three times, the solid was dried under vacuum at 60 °C for ...

Embodiment 2

[0084] The hydrogenated product was obtained in the same manner as in Example 1, except that 9 g of the catalyst was used. The resulting hydrogenated product has a degree of hydrogenation of 90%, 114×10 4 The weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) of 3.2.

[0085] In a closed kneader, put 100 parts by weight of the hydrogenated product prepared above, 1 part by weight of stearic acid, 5 parts by weight of zinc oxide and 20 parts by weight of carbon black [product of Toyo Carbon Co., Ltd., trade name "N220"], and the mixture was kneaded at 50° C. at 40 rpm for 3 minutes. The kneaded product was mixed with 2.5 parts by weight of a vulcanization accelerator [N-cyclohexylbenzothiazolylsulfonamide (CBS), product of Ouchi Shinko Chemical Industrial Co., Ltd., trade name "Nocceler CZ"] and 1 part by weight of sulfur, Further kneading was performed at 50° C. in an open roll press, and the resulting kneaded product was preformed according t...

Embodiment 3

[0087] The hydrogenated product was obtained in the same manner as in Example 1, except that 18 g of the catalyst was used. The resulting hydrogenated product has a degree of hydrogenation of 100%, 83×10 4 The weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) of 2.7.

[0088] In a closed kneader, 100 parts by weight of the hydrogenated product prepared above, 1 part by weight of stearic acid, 5 parts by weight of zinc oxide and 20 parts by weight of carbon black were placed, and the mixture was kneaded at 150° C. for 3 minutes at 40 rpm. The kneaded product was further kneaded with 3 parts by weight of peroxide [product of NOF CORPORATION, trade name "PEROXYMON F40"] at 50° C. in an open roll press, and the resulting kneaded product was preformed according to the shape of the mold, It was subjected to press vulcanization (crosslinking) at 160° C. for about 60 minutes to obtain a 2 mm thick sheet.

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Abstract

Rubber-like articles or articles containing rubber-like substances, consisting of or made from hydrogenated natural polyisoprene products or modified products thereof. In the rubbery product or the rubbery substance-containing product, a rubbery elastic body made of a natural polyisoprene hydrogenated product or a modified product thereof is contained. As the natural polyisoprene hydrogenation product, for example, a polymer obtained by reacting natural polyisoprene with hydrogen in a solvent in the presence of a hydrogenation catalyst can be used. The hydrogenation ratio of the natural polyisoprene hydrogenated product is preferably 50% or higher. In addition, it is preferable that the natural polyisoprene hydrogenated product has a weight average molecular weight of 20×10 4 or higher and exhibits a molecular weight distribution of 2.0 or higher. The rubber-like article or article containing a rubber-like substance exhibits high thermal stability and weather resistance, and is also preferable from the viewpoint of resources and the environment since a plant-derived raw material is used.

Description

technical field [0001] The present invention typically relates to rubber-like articles or articles containing rubber-like materials. Specifically, it relates to rubber-like elastic articles and methods for their preparation, and more particularly, it relates to rubber-like elastic articles containing hydrogenated natural polyisoprenoids and methods for their preparation. The hydrogenated natural polyisoprene has a modified structure due to the hydrogenation of the natural polyisoprene resulting in a higher degree of saturation. Rubber-like elastic products are excellent in heat resistance, weather resistance, abrasion resistance, compression set (SET) properties, and cold resistance, and are useful as tires, tubes, medical rubber products, latex dipped products, rubber threads, belts and Rubber products for seismic base isolation, vibration isolation, packaging and other industrial uses. [0002] The present invention also relates to a resin modifier containing a rubbery pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/02C08L101/00C08K3/00C08K5/00
Inventor 井上真一西尾智博伊藤晴彦堀内健一笠崎敏明
Owner NITTA CORP
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