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Modified rubber and method for producing the same

A technology of modified rubber and manufacturing method, applied in the field of modified rubber, which can solve the problems of reduced air-tightness, unfavorable atomic economy, and limited use, and achieve the effect of excellent air-tightness

Inactive Publication Date: 2010-12-15
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, if there are too many hydroxyl groups, 50% or more, the gas-impermeability under high humidity will decrease, or it will become crystalline, so its use will be limited.
[0004] In addition, in today's time when the issue of depletion of fossil fuels is emphasized, it is also disadvantageous from the viewpoint of atom economy to forcibly use raw materials derived from fossil fuels and perform deacetylation by hydrolysis of ester sites.

Method used

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  • Modified rubber and method for producing the same
  • Modified rubber and method for producing the same
  • Modified rubber and method for producing the same

Examples

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Effect test

Embodiment 1

[0050] figure 1 The structure of the modified rubber according to an example of the present invention is shown. The modified rubber should be called hydroxyl-containing natural rubber, which is produced from natural rubber by epoxidizing natural rubber. The double bonds contained in each isoprene unit are all converted into hydroxyl, epoxy, and furan rings. . Hereinafter, instead of a detailed description of the configuration, a method for producing the modified rubber will be described.

[0051]

[0052] With respect to 100 mass parts of commercially available high ammonia natural rubber latex (30 mass % solid content), add 1.0 mass parts sodium lauryl sulfate and 0.1 mass parts urea, fully stir it and make it dissolve, then stand at room temperature for 1 Hour. It should be noted that urea was added to denature proteins.

[0053] Centrifugation was performed to remove the supernatant, and the resulting paste was mixed with a 1% by mass sodium lauryl sulfate aqueous sol...

Embodiment 2

[0061] 70 parts by mass of peracetic acid was added to 10 parts by mass of solid content of the deproteinized natural rubber latex formed in the same manner as in Example 1, and 5 parts by mass of isopropyl alcohol (IPA) was added simultaneously, stirred and mixed, and left to stand at room temperature for 16 hours . Thereafter, ammonia water was added for neutralization, and washing was repeated several times by centrifugation using distilled water. It was then dried under vacuum to formulate a modified rubber.

[0062] The NMR spectrum of the resulting modified rubber is shown in image 3 . Depend on image 3 It can be seen that the 5.2ppm signal from the double bond of the isoprene unit disappears, while the 2.7ppm signal from the epoxy group disappears, indicating that the entire double bond can be converted to hydroxyl or furan by adding isopropanol as a co-solvent ring.

Embodiment 3

[0064]

[0065] A deproteinized natural rubber latex was prepared in the same manner as in Example 1 using a commercially available high-ammonia natural rubber latex (30% by mass solid content).

[0066]

[0067] 14 g of peracetic acid was added to 20 g of the obtained deproteinized natural rubber latex, stirred and mixed, and left still at room temperature for 16 hours. Thereafter, ammonia water was added for neutralization, and washing was repeated several times by centrifugation using distilled water. It was then dried under vacuum to formulate a modified rubber.

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Abstract

A double bond contained in each isoprene unit of a natural rubber is converted into an epoxy group, and then the epoxy group is hydrolyzed, thereby being converted into a hydroxyl group. Since a hydroxyl group is surely introduced into every double bond and many hydroxyl groups are introduced as a whole, the thus-obtained modified rubber can be used for food packaging films having excellent gas impermeability.

Description

technical field [0001] The present invention relates to a modified rubber as a functional polymer material used for a film for food packaging, an inner liner of a tire, and the like, and a method for producing the same. Background technique [0002] In conventional industries, various functional organic materials produced from raw materials derived from fossil fuels such as petroleum have been used. For example, ethylene-vinyl alcohol copolymer, one of functional polymer materials, is used for food packaging such as mayonnaise bottles by taking advantage of its remarkably low gas permeability. The ethylene-vinyl alcohol copolymer is produced by free-radically copolymerizing ethylene from fossil fuels with vinyl acetate, followed by hydrolysis of the ester sites to introduce hydroxyl groups. [0003] In films for food packaging, oxygen impermeability is an important characteristic. When the oxygen transmission coefficient of an ethylene-vinyl alcohol copolymer is judged fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/00B65D65/02
CPCC08C19/40C08C19/06C08L19/006C08C1/04C08L15/00
Inventor 中岛毅彦松田雅敏山本祥正河原成元
Owner TOYOTA JIDOSHA KK
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