JPH1160741A - Rubber pellet - Google Patents

Rubber pellet

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Publication number
JPH1160741A
JPH1160741A JP22835897A JP22835897A JPH1160741A JP H1160741 A JPH1160741 A JP H1160741A JP 22835897 A JP22835897 A JP 22835897A JP 22835897 A JP22835897 A JP 22835897A JP H1160741 A JPH1160741 A JP H1160741A
Authority
JP
Japan
Prior art keywords
rubber
coating
granulated
rubber particles
particles
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP22835897A
Other languages
Japanese (ja)
Inventor
Katsuhiko Takahashi
克彦 高橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Original Assignee
Fujikura 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
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP22835897A priority Critical patent/JPH1160741A/en
Publication of JPH1160741A publication Critical patent/JPH1160741A/en
Pending legal-status Critical Current

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  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain rubber pellets capable of preventing close adhesion among rubber particles, etc., each other and exhibiting excellent weighing property, working property and preservation property by coating a specific polymer on the surface of granulated rubber particles. SOLUTION: The rubber pellets are obtained by coating the surface of (A) granulated rubber particles (e.g.; made from an ethylene-propylene rubber, a styrene-butadiene rubber, a natural rubber, etc., as a raw material and having 2-10 mm mean particle diameter) with (B) a thermoplastic crystalline rubber [e.g.; a polymer constituting the component (A), having a stable shape keeping property at (-)20-50 deg.C in which temperature there is a possibility for handling the material, and not adhering each other as a single material], preferably using <=10 pt.wt. component (B) based on (A)=100 pts.wt.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、生ゴムなどのゴム
ペレットに関し、更に詳しくは、粘着性に富むゴム粒子
間の密着を防止することによって、計量性、作業性、保
管性等を向上させたゴムペレットに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rubber pellets, such as raw rubber, and more particularly, to improved weighing, workability, storage, and the like by preventing adhesion between rubber particles having high tackiness. Related to rubber pellets.

【0002】[0002]

【従来の技術】一般に、生ゴム材料は、通常ベールと呼
ばれる一度造粒されたゴム粒子同士が互いに密着した状
態で供給されている。しかしながら、ゴム粒子同士を元
の粒子に分離することは困難で、配合などで計量する場
合には、刃物で切断する方法が一般的にとられている。
また、互いに密着してしまうために、ポリエチレンなど
のプラスチック材料のようにコンテナなど大容量の容器
での運搬ができず、通常は、内袋付きの紙袋などに1袋
当たり25Kg程度の重さで梱包されている。
2. Description of the Related Art Generally, a raw rubber material is supplied in such a state that once-granulated rubber particles usually called veil are in close contact with each other. However, it is difficult to separate the rubber particles into the original particles, and when weighing by blending or the like, a method of cutting with a blade is generally adopted.
In addition, since they are in close contact with each other, they cannot be transported in a large-capacity container such as a container such as a plastic material such as polyethylene. Usually, a paper bag with an inner bag weighs about 25 kg per bag. Packed.

【0003】更に、一部、粉末化あるいはペレット化さ
れたゴムはあるが、限られたものであり、全ての生ゴム
について、ペレット化する技術はないのが現状である。
[0003] Further, there are rubbers that are partially powdered or pelletized, but are limited, and at present, there is no technology for pelletizing all raw rubbers.

【0004】ところで、従来の生ゴム材料では、ゴム粒
子同士が密着してしまうので、下記(a)〜(h)の数多くの
課題がある。 (a) 精度の高い計量が難しい。(特に少量計量の場合) (b) 計量の自動化が困難である。 (c) 保管に際しても、密着して大きな固まりとならない
ようセパレータを置くなど工夫が必要である。 (d) 粘着力が強く、ゴミなど表面に付着した場合に除去
が困難である。 また、大容量の容器での運搬ができず、紙袋などで供給
されるため、 (e) 計量の自動化が困難である。 (f) 紙袋など梱包材のゴミが出る。 (g) 梱包材に由来する異物が混入する可能性がある。 (h) 配合時に、こまめに梱包を解いて計量する必要があ
るなど、手間がかかる。
In the conventional raw rubber material, rubber particles adhere to each other, so that there are a number of problems (a) to (h) below. (a) It is difficult to measure with high accuracy. (Especially in case of small amount measurement) (b) It is difficult to automate measurement. (c) At the time of storage, it is necessary to devise a method such as placing a separator so that it does not form a large mass due to close contact. (d) Strong adhesion, making it difficult to remove dust and dirt on the surface. In addition, since it cannot be transported in a large-capacity container and is supplied in a paper bag, it is difficult to (e) automate weighing. (f) Garbage in packing materials such as paper bags is generated. (g) There is a possibility that foreign matter derived from the packing material will be mixed. (h) During compounding, it is necessary to unpack and weigh frequently.

【0005】[0005]

【発明が解決しようとする課題】本発明は、上記従来の
生ゴム材料における数多くの課題に鑑み、これを解消し
ようとするものであり、ゴム粒子間の密着等を防止する
ことによって、計量性、作業性、保管性等を向上させた
ゴムペレットを提供することを目的とする。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned many problems in the conventional raw rubber material, and is intended to solve the problem. An object of the present invention is to provide a rubber pellet having improved workability, storage property, and the like.

【0006】[0006]

【課題を解決するための手段】本発明者は、上記従来の
課題を解決するために、造粒されたゴム粒子表面に特定
物性の被膜を施すことにより目的のゴムペレットが得ら
れることを見い出し、本発明を完成するに至ったのであ
る。すなわち、本発明のゴムペレットは、下記(1)〜(3)
に存する。 (1) 造粒されたゴム粒子表面を熱可塑性結晶性ポリマー
で被覆してなることを特徴とするゴムペレット。 (2) 熱可塑性結晶性ポリマーの被覆量が、造粒されたゴ
ム粒子100重量部に対し、10重量部以下である上記
(1)記載のゴムペレット。 (3) 造粒されたゴム粒子の平均粒径が2〜10mmであ
る上記(1)又は(2)記載のゴムペレット。
Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present inventor has found that a desired rubber pellet can be obtained by applying a coating of specific physical properties to the surface of granulated rubber particles. Thus, the present invention has been completed. That is, the rubber pellets of the present invention include the following (1) to (3)
Exists. (1) Rubber pellets characterized by coating the surface of granulated rubber particles with a thermoplastic crystalline polymer. (2) The coating amount of the thermoplastic crystalline polymer is 10 parts by weight or less based on 100 parts by weight of the granulated rubber particles.
The rubber pellet according to (1). (3) The rubber pellet according to the above (1) or (2), wherein the averaged particle size of the granulated rubber particles is 2 to 10 mm.

【0007】[0007]

【発明の実施の形態】以下に、本発明の実施の形態を詳
しく説明する。本発明のゴムペレットは、造粒されたゴ
ム粒子表面を熱可塑性結晶性ポリマーで被覆してなるこ
とを特徴とするものである。造粒されたゴム粒子表面を
熱可塑性結晶性ポリマーで被覆することによって、造粒
ゴム粒子間の密着を防止することができることとなる。
Embodiments of the present invention will be described below in detail. The rubber pellet of the present invention is characterized in that the surface of the granulated rubber particles is coated with a thermoplastic crystalline polymer. By coating the surface of the granulated rubber particles with the thermoplastic crystalline polymer, adhesion between the granulated rubber particles can be prevented.

【0008】本発明によりゴムペレットにできるゴム材
料としては、特に制限されるものではないが、エチレン
プロピレンゴム(EPDM)、スチレンブタジエンゴム
(SBR)、天然ゴム(NR)、イソプレンゴム(I
R)、ニトリルブタジエンゴム(NBR)、クロロプレ
ンゴム(CR)、ブチルゴム(IIR)などが挙げられ
る。
The rubber material that can be formed into rubber pellets according to the present invention is not particularly limited, but ethylene propylene rubber (EPDM), styrene butadiene rubber (SBR), natural rubber (NR), isoprene rubber (I)
R), nitrile butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR) and the like.

【0009】これらのゴム原料の造粒方法としては、例
えば、押出機等を用いて原料ゴムを造粒した後、直ちに
被覆する熱可塑性結晶性ポリマーを適当量溶解した溶液
中に通したり、噴霧するなどした後、溶媒を揮発させて
表面をコーティィングする方法等により行うことができ
る。造粒されたゴム粒子の平均粒径は、2〜10mm、
好ましくは、3〜8mmであることが望ましい。この平
均粒径の範囲とすることにより、上述の従来の課題を解
決して計量性、作業性、保管性等を大幅に向上させるこ
とができる。
As a method of granulating these rubber raw materials, for example, after the raw rubber is granulated using an extruder or the like, the rubber is immediately passed through a solution in which an appropriate amount of the thermoplastic crystalline polymer to be coated is dissolved, or sprayed. After that, the solvent can be volatilized to coat the surface. The average particle size of the granulated rubber particles is 2 to 10 mm,
Preferably, it is desirably 3 to 8 mm. By setting the average particle diameter in the above range, the above-described conventional problems can be solved and the weighing property, workability, storage property, and the like can be significantly improved.

【0010】本発明に用いる被覆用の熱可塑性結晶性ポ
リマーは、特に制限されるものではないが、材料を取り
扱う可能性のある温度である−20〜50℃において定
形性を有し、単体で互いに密着しないものが望ましい。
具体的には、ポリエチレン、ポリプロピレン、ポリスチ
レンなどが挙げられる。更に、好ましくは、被覆される
ゴム材料を構成するモノマーからなるポリマーで被覆す
ることが望ましい。例えば、EPゴムの場合であれば、
エチレンをモノマーとしたポリエチレンやプロピレンな
どが挙げられる。また、ポリエチレンの中でも低密度ポ
リエチレンは、結晶化度が40%程度に抑えられてお
り、物性への影響が小さいので更に好ましい。
Although the thermoplastic crystalline polymer for coating used in the present invention is not particularly limited, it has a formability at -20 to 50 ° C., which is a temperature at which the material may be handled, and Those that do not adhere to each other are desirable.
Specific examples include polyethylene, polypropylene, and polystyrene. Further, it is preferable to coat with a polymer composed of a monomer constituting the rubber material to be coated. For example, in the case of EP rubber,
Examples thereof include polyethylene and propylene using ethylene as a monomer. Further, among the polyethylenes, low-density polyethylene is more preferable because the crystallinity is suppressed to about 40% and the influence on physical properties is small.

【0011】ゴムペレットにするためのゴム粒子表面へ
の被覆方法についても、特に制限されるものでなく、例
えば、被覆用ポリマーを溶融し、ゴム粒子表面にコーテ
ィングする方法、被覆用ポリマーを溶剤など適当な溶媒
に溶かした溶液を塗布し、溶媒を揮散させて被覆する方
法などが挙げられる。
The method for coating the surface of the rubber particles for forming the rubber pellets is not particularly limited. For example, a method of melting the coating polymer and coating the surface of the rubber particles, a method of coating the coating polymer with a solvent, etc. A method in which a solution dissolved in an appropriate solvent is applied, and the solvent is volatilized for coating is used.

【0012】また、造粒したゴム粒子への被覆量である
が、これも特に制限を受けるものではないが、被覆量が
多すぎると被覆ポリマーに物性の影響を受けてしまう。
好ましくは、熱可塑性結晶性ポリマーの被覆量は造粒さ
れたゴム粒子100重量部に対し、10重量部以下であ
る、好ましくは、5重量以下、更に好ましくは、1〜5
重量部である。
The coating amount on the granulated rubber particles is not particularly limited, but if the coating amount is too large, physical properties are affected by the coating polymer.
Preferably, the coating amount of the thermoplastic crystalline polymer is 10 parts by weight or less, preferably 5 parts by weight or less, more preferably 1 to 5 parts by weight, based on 100 parts by weight of the granulated rubber particles.
Parts by weight.

【0013】[0013]

【実施例】次に、実施例及び比較例により更に本発明の
内容を更に詳細に説明する。なお、本発明は下記実施例
により制限されるものではない。
Next, the contents of the present invention will be described in more detail with reference to Examples and Comparative Examples. The present invention is not limited by the following examples.

【0014】(実施例1)下記被覆用ポリマーを200
℃に加温溶融させて、造粒したゴム上に滴下してゴム粒
子表面にコーティングして、ゴムペレットを調製した。 ゴム材料:EPDM(平均粒径5mm)、100重量部 被覆用ポリマー:低密度ポリエチレン(結晶化度40
%)、2重量部
(Example 1) The following coating polymer was used for 200
The mixture was heated and melted at ℃, dropped onto granulated rubber, and coated on the surface of rubber particles to prepare rubber pellets. Rubber material: EPDM (average particle size 5 mm), 100 parts by weight Coating polymer: low density polyethylene (crystallinity 40
%), 2 parts by weight

【0015】(実施例2)下記被覆用ポリマーを溶剤
(ヘキサン)に溶かし、噴霧によりゴム粒子表面に塗布
して、溶媒を揮散させてゴムペレットを調製した。 ゴム材料:EPDM(平均粒径5mm)、100重量部 被覆用ポリマー:低密度ポリエチレン(結晶化度40
%)、2重量部
Example 2 The following polymer for coating was dissolved in a solvent (hexane), applied to the surface of rubber particles by spraying, and the solvent was volatilized to prepare rubber pellets. Rubber material: EPDM (average particle size 5 mm), 100 parts by weight Coating polymer: low density polyethylene (crystallinity 40
%), 2 parts by weight

【0016】(比較例1)表面をコーティングしていな
いゴム粒子(EPDM)からなるベール。
Comparative Example 1 A veil made of rubber particles (EPDM) whose surface is not coated.

【0017】(試験例1)上記実施例1、2及び比較例
1について、一定量のベースゴムを±1%の精度で計量
するのに要する時間を計測した。合計10回各回とも異
なる重量を計量するのに要した時間の平均値を測定し、
指数(実施例1の平均値を100として場合の相対値)
で評価した。これらの結果を下記表1に示す。
(Test Example 1) In Examples 1 and 2 and Comparative Example 1, the time required to measure a fixed amount of base rubber with an accuracy of ± 1% was measured. Measure the average value of the time required to weigh a different weight a total of 10 times,
Index (relative value when the average value in Example 1 is set to 100)
Was evaluated. The results are shown in Table 1 below.

【0018】[0018]

【表1】 [Table 1]

【0019】(表1等の考察)本発明範囲となる実施例
1、2によれば、従来のゴム粒子からなるベールに較
べ、計量時間を大幅に短縮でき、精度の高い計量ができ
ることが判明した。
(Consideration of Table 1 and the like) According to Examples 1 and 2, which fall within the scope of the present invention, it has been found that the measuring time can be greatly reduced as compared with the conventional veil made of rubber particles, and that highly accurate measurement can be performed. did.

【0020】[0020]

【発明の効果】本発明によれば、造粒されたゴム粒子表
面を熱可塑性結晶性ポリマーで被覆することによって、
ゴム粒子間の密着が防止されることとなるので、精度の
高い計量をより短時間で実施することができると共に、
作業性、保管性にも優れたゴムペレットが提供される。
According to the present invention, by coating the surface of the granulated rubber particles with a thermoplastic crystalline polymer,
Since the adhesion between the rubber particles is prevented, highly accurate measurement can be performed in a shorter time,
A rubber pellet excellent in workability and storage property is provided.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 造粒されたゴム粒子表面を熱可塑性結晶
性ポリマーで被覆してなることを特徴とするゴムペレッ
ト。
1. A rubber pellet comprising the surface of granulated rubber particles coated with a thermoplastic crystalline polymer.
【請求項2】 熱可塑性結晶性ポリマーの被覆量が、造
粒されたゴム粒子100重量部に対し、10重量部以下
である請求項1記載のゴムペレット。
2. The rubber pellet according to claim 1, wherein the coating amount of the thermoplastic crystalline polymer is 10 parts by weight or less based on 100 parts by weight of the granulated rubber particles.
【請求項3】 造粒されたゴム粒子の平均粒径が2〜1
0mmである請求項1又は2記載のゴムペレット。
3. The granulated rubber particles having an average particle size of 2-1.
The rubber pellet according to claim 1 or 2, which is 0 mm.
JP22835897A 1997-08-25 1997-08-25 Rubber pellet Pending JPH1160741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22835897A JPH1160741A (en) 1997-08-25 1997-08-25 Rubber pellet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22835897A JPH1160741A (en) 1997-08-25 1997-08-25 Rubber pellet

Publications (1)

Publication Number Publication Date
JPH1160741A true JPH1160741A (en) 1999-03-05

Family

ID=16875215

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22835897A Pending JPH1160741A (en) 1997-08-25 1997-08-25 Rubber pellet

Country Status (1)

Country Link
JP (1) JPH1160741A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006213913A (en) * 2005-01-04 2006-08-17 Sumitomo Chemical Co Ltd Method for producing vulcanized solid rubber article from nonsticking pellet and vulcanized solid rubber article obtained thereby
US7820086B2 (en) 2005-01-04 2010-10-26 Sumitomo Chemical Company, Limited Process for producing rubber composition, process for producing vulcanized molded article of rubber composition, and process for producing vulcanized and foamed molded article of rubber composition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006213913A (en) * 2005-01-04 2006-08-17 Sumitomo Chemical Co Ltd Method for producing vulcanized solid rubber article from nonsticking pellet and vulcanized solid rubber article obtained thereby
US7820086B2 (en) 2005-01-04 2010-10-26 Sumitomo Chemical Company, Limited Process for producing rubber composition, process for producing vulcanized molded article of rubber composition, and process for producing vulcanized and foamed molded article of rubber composition

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