WO2008142926A1 - Procédé de fabrication de caoutchouc naturel - Google Patents

Procédé de fabrication de caoutchouc naturel Download PDF

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Publication number
WO2008142926A1
WO2008142926A1 PCT/JP2008/057228 JP2008057228W WO2008142926A1 WO 2008142926 A1 WO2008142926 A1 WO 2008142926A1 JP 2008057228 W JP2008057228 W JP 2008057228W WO 2008142926 A1 WO2008142926 A1 WO 2008142926A1
Authority
WO
WIPO (PCT)
Prior art keywords
natural rubber
latex
compound
producing
quaternary ammonium
Prior art date
Application number
PCT/JP2008/057228
Other languages
English (en)
Japanese (ja)
Inventor
Tetsuji Kawazura
Takashi Kakubo
Original Assignee
The Yokohama Rubber Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2008098494A external-priority patent/JP4330653B2/ja
Application filed by The Yokohama Rubber Co., Ltd. filed Critical The Yokohama Rubber Co., Ltd.
Priority to US12/451,307 priority Critical patent/US20100120956A1/en
Priority to DE112008001360T priority patent/DE112008001360T5/de
Publication of WO2008142926A1 publication Critical patent/WO2008142926A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
    • C08C1/00—Treatment of rubber latex
    • C08C1/14—Coagulation

Definitions

  • the present invention relates to a method for producing natural rubber, and more specifically, by adding a compound having a quaternary ammonium ion and a carboxyl ion in the molecule and drying the natural rubber latex, an increase in the viscosity of the raw rubber during storage is suppressed.
  • the present invention relates to a natural rubber production method for producing solid natural rubber. Background art
  • Natural rubber is an important resource because it is a resource that does not depend on petroleum and has excellent mechanical properties.
  • the natural rubber currently distributed for the manufacture of rubber products mainly consists of rubber trees (scientific name: Hevea brasiliensis) in Southeast Asian countries, China, and some African countries.
  • Latex collected by tapping is solidified with acid, then water is squeezed away and cut into fine pieces, dried with hot air, and technical grade rubber (Technical Specialized Rubber: TSR), General grade TSR produced by collecting the collected latex with acid or natural coagulation as raw materials, cutting it into fine pieces, washing it with water, and removing the contaminated waste.
  • the collected latex is coagulated with acid, etc., sheeted with a roll with ribs and dried in the sun, smoke-dried, and further, the waste is cut visually.
  • Ribudosumoku de sheet to produce I (R S S).
  • Patent Document 1 It is proposed to instantly dry natural rubber latex instantly at low temperature without coagulation using waves, and Patent Document 2 not only allows natural rubber latex to be dried as it is, but also latex state. Proposing to produce a natural rubber that can be reduced in viscosity and processed to a very low viscosity by performing a certain chemical treatment, and in Patent Document 3, a quaternary ammonium salt structure is added to the natural rubber latex.
  • Patent Document 3 a method for producing natural rubber that can add a compound in the molecule to remove moisture and dry it to obtain a vulcanized rubber with low hysteresis loss.
  • Patent Document 1 Japanese Patent Laid-Open No. 2 0 0 5-1 9 4 5 0 3
  • Patent Document 2 Japanese Patent Application No. 2 0 0 6-2 2 8 1 4 9
  • Patent Document 3 Patent Application 2 0 0 7-0 1 6 5 4 1 Application Description Disclosure of Invention
  • An object of the present invention is to provide a method for producing natural rubber, which can solve the problem that the viscosity of natural rubber (raw rubber) increases during storage.
  • a method for producing solid natural rubber which comprises adding a compound having a quaternary ammonium ion and a carboxyl ion in the molecule to natural rubber latex and removing moisture to dry.
  • a compound having a quaternary ammonium ion and a carboxyl ion in a molecule is added to a natural rubber in a latex state, stirred and dissolved, and then dried without solidifying the natural rubber, thereby storing it. It is possible to obtain a solid natural rubber in which an increase in the viscosity of the rubber is suppressed, and the rubber kneading cost can be reduced.
  • Examples of the compound having a quaternary ammonium ion and a carboxyl ion used in the present invention include compounds represented by the following formula (I).
  • R 1, R 2 and R 3 are each independently, a carbon number 1-2 0, preferably 1-1 0 alkyl group, carbon number 6-2 0, better good Or an aryl group having 6 to 16 carbon atoms, an organic group selected from aralkyl groups having 7 to 20 carbon atoms, preferably 7 to 17 carbon atoms, and may contain an ester bond or an amide bond, and R 4 is carbon.
  • the addition amount of the compound having quaternary ammonium ions and carboxyl ions is preferably from 0.001 to 0.1 mol%, more preferably from 1.0 kg of solid content in the natural rubber latex. Is 0.0 0.08 to 0.08 mol%. If the amount added is small, the increase in viscosity during storage may not be suppressed. On the other hand, if the amount is large, the effect corresponding to the amount added may not be obtained and the cost may increase.
  • the natural rubber latex containing the compound having the quaternary ammonium ion and the carboxyl ion in the molecule can be prepared by any method.
  • the natural rubber latex is dried after removing moisture.
  • a method for removing moisture and drying a generally known method can be used.
  • the method of spraying and drying the natural rubber latex in a pulse atmosphere is drying at a relatively low temperature in a short time.
  • pulse drying rubber can be produced by drying the above natural rubber latex using, for example, a pulse combustor that generates a pulse shock wave described in Japanese Patent Application Laid-Open No. 7-71875.
  • such a pulse combustor is used, preferably a latex having a solid content concentration of 70% by weight or less, preferably a frequency of 2 5 0 1 2 0 0 Hz, more preferably 3 0 0 1 0 0 0 Hz, preferably below 1 4 0, more preferably ⁇ is 4 0 1 0 0, 1 0 0 2 0
  • viscosity stabilizers can be blended in natural rubber latex that is spray-dried in an atmosphere of shock waves by pulse combustion as required.
  • any generally used viscosity stabilizer that is not likely to be decomposed under the pulse drying conditions can be used.
  • hydroxylamine sulfate (NH 2 OH) 2 ⁇ H 2 S0 4 )
  • Semicarbaside (NH 2 CONHNH 2 )
  • dimedone (1,1-dimethylcyclohexane-1,3-dione) and the like can be used.
  • the natural rubber produced in the present invention includes, for example, general-purpose gen-based rubbers, reinforcing agents (filers) such as carbon black and silica, vulcanization or crosslinking agents, vulcanization or crosslinking accelerators, various oils, anti-aging
  • Various additives that are generally blended for tires such as additives and plasticizers, and other rubber compositions can be blended into rubber compositions, and these additives are kneaded by a general method. And can be used for vulcanization or crosslinking.
  • the blending amounts of these additives can be conventional conventional blending amounts as long as the object of the present invention is not violated.
  • Lupke rebound resilience Rebound resilience at a temperature of 20 was measured according to JI S K 6 2 5 5.
  • Abrasion resistance Measured according to JISK 6 2 6 4 with a load of 4.0 kg and a slip rate of 30% using a Lambourn abrasion tester. The results were displayed as an index with the wear amount of Reference Example 2 as 100. The higher this index, the better the wear resistance.
  • natural rubber with suppressed increase in viscosity during storage can be produced from natural rubber latex, which is useful for various rubber products such as tires, conveyor bells, rubber bearings and the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un caoutchouc naturel solide dont l'augmentation de viscosité pendant le stockage peut être empêchée. Le procédé selon l'invention comprend les étapes consistant à ajouter un composé comportant un ion ammonium quaternaire et un ion carboxyle par molécule à un latex de caoutchouc naturel, éliminer l'humidité du mélange et sécher le produit résultant.
PCT/JP2008/057228 2007-05-22 2008-04-08 Procédé de fabrication de caoutchouc naturel WO2008142926A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/451,307 US20100120956A1 (en) 2007-05-22 2008-04-08 Method for Production of Natural Rubber
DE112008001360T DE112008001360T5 (de) 2007-05-22 2008-04-08 Verfahren zur Herstellung eines natürlichen Kautschuks

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2007135255 2007-05-22
JP2007-135255 2007-05-22
JP2008098494A JP4330653B2 (ja) 2007-05-22 2008-04-04 天然ゴムの製造方法
JP2008-098494 2008-04-04

Publications (1)

Publication Number Publication Date
WO2008142926A1 true WO2008142926A1 (fr) 2008-11-27

Family

ID=40031642

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/057228 WO2008142926A1 (fr) 2007-05-22 2008-04-08 Procédé de fabrication de caoutchouc naturel

Country Status (1)

Country Link
WO (1) WO2008142926A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010055919A1 (fr) * 2008-11-13 2010-05-20 株式会社ブリヂストン Compositions de caoutchouc et pneus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1366823A (en) * 1972-04-07 1974-09-11 Uemura Kogyo Kk Metal plating process
JPH06322005A (ja) * 1993-05-13 1994-11-22 Kao Corp 脱蛋白天然ゴムラテックスの凝固補助剤およびこれを用いる生ゴムの製造方法
WO2005056611A1 (fr) * 2003-12-12 2005-06-23 The Yokohama Rubber Co., Ltd. Methode de production de caoutchouc a partir de latex de caoutchouc
CN1709956A (zh) * 2004-12-10 2005-12-21 海南省国营立才农场 纳米改性天然橡胶

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1366823A (en) * 1972-04-07 1974-09-11 Uemura Kogyo Kk Metal plating process
JPH06322005A (ja) * 1993-05-13 1994-11-22 Kao Corp 脱蛋白天然ゴムラテックスの凝固補助剤およびこれを用いる生ゴムの製造方法
WO2005056611A1 (fr) * 2003-12-12 2005-06-23 The Yokohama Rubber Co., Ltd. Methode de production de caoutchouc a partir de latex de caoutchouc
CN1709956A (zh) * 2004-12-10 2005-12-21 海南省国营立才农场 纳米改性天然橡胶

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010055919A1 (fr) * 2008-11-13 2010-05-20 株式会社ブリヂストン Compositions de caoutchouc et pneus

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