JPS628450B2 - - Google Patents
Info
- Publication number
- JPS628450B2 JPS628450B2 JP56025813A JP2581381A JPS628450B2 JP S628450 B2 JPS628450 B2 JP S628450B2 JP 56025813 A JP56025813 A JP 56025813A JP 2581381 A JP2581381 A JP 2581381A JP S628450 B2 JPS628450 B2 JP S628450B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber latex
- resin
- zinc oxide
- weight
- rubber
- 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.)
- Expired
Links
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 31
- 229920000126 latex Polymers 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 16
- 239000011787 zinc oxide Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 238000004073 vulcanization Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229920006173 natural rubber latex Polymers 0.000 claims description 5
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 claims description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 2
- 229920006270 hydrocarbon resin Polymers 0.000 claims description 2
- 239000003209 petroleum derivative Substances 0.000 claims description 2
- 229920006174 synthetic rubber latex Polymers 0.000 claims description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 2
- 235000014692 zinc oxide Nutrition 0.000 description 15
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 6
- 239000005060 rubber Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 244000043261 Hevea brasiliensis Species 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920003052 natural elastomer Polymers 0.000 description 3
- 229920001194 natural rubber Polymers 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 for example Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 150000003097 polyterpenes Chemical class 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
本発明は天然ゴムラテツクスを必須基材ゴム成
分とするゴムラテツクス組成物に関する。
天然ゴムを基材ゴムとするゴムラテツクス組成
物に加硫促進助剤として酸化亜鉛を配合する場
合、酸化亜鉛の一部が天然ゴム中のアンモニアと
反応して錯塩Zn（NH3）２＋ ｏを形成し、この錯塩が
ラテツクス粒子表面の石ケンあるいは保護コロイ
ドである蛋白質と不溶性の亜鉛塩を形成するため
に配合系は不安定化し粘度が増加する。
このような問題の解決策として水酸化カリウム
を添加する方法が提案されている。しかしなが
ら、水酸化カリウムはラテツクスを安定化しすぎ
る傾向が強く、成形時不都合を生ずるためその配
合量の調整は非常に困難である。
本発明は上記問題を改良するためになされたも
のあつてその要旨は、天然ゴムラテツクスまたは
天然ゴムラテツクスと合成ゴムラテツクスとの混
合ゴムラテツクス100重量部に対して、加硫温度
よりも低い融点または軟化点を有する樹脂で被覆
された酸化亜鉛最大量10重量部含有するゴム組成
物に存する。
本発明に使用する基材ゴムは天然ゴムが一般的
であるが、用途に応じて合成ゴム、例えばイソプ
レンゴム、ポリブタジエンゴム、エチレンプロピ
レンゴム、スチレン−ブタジエンゴム等を適宜配
合してもよい。
酸化亜鉛を被覆する樹脂は加硫温度以下の融点
または軟化点を有する樹脂であればよく、特に限
定的ではないが、通常は融点または軟化点が約
120℃以下のクマロン樹脂、フエノール−テルペ
ン樹脂、石油系炭化水素樹脂、ロジン誘導体等が
用いられる。
上記樹脂を用いて酸化亜鉛を被覆するには、例
えば、所定の粒径に粉砕した酸化亜鉛を上記樹脂
と充分混合し〔混合割合は通常、酸化亜鉛：樹脂
＝100：１〜100：1000（重量比）〕、該混合物を樹
脂の融点または軟化点以上に加熱して充分撹拌し
た後冷却し、所定の粒径にそろえればよい。
このようにして得られる被覆酸化亜鉛は通常、
固形分20〜50重量％の水分散体としてゴムラテツ
クス組成物に配合する。
被覆された酸化亜鉛の配合量は前記ゴム成分
100重量部に対して通常0.1〜５重量部（酸化亜鉛
換算）とする。この配合量が0.05重量部以下では
加硫促進能力が劣り、また10重量部以上では徒に
配合物の加硫物の比重を高めるのみで実際の加硫
促進の効果はあまり関係なくなるので好ましくな
い。
本発明によるゴムラテツクス組成物には上記の
基材ゴムおよび加硫促進助剤としての酸化亜鉛、
並びに加硫剤としての硫黄の他に常套の添加剤、
例えば補強剤、老化防止剤、等を適宜配合すれば
よい。
本発明によつて得られるゴムラテツクス組成物
は極めて良好な貯蔵安定性を示し、これを加硫成
型して得られる製品も良好な特性を具備する。
以下、本発明を実施例によつて説明する。
実施例１〜３および比較例１〜３
被覆酸化亜鉛の調製
合成ポリテルペン樹脂（日本ゼオン株式会社市
販品クイントンＵ−185；軟化点85℃）100ｇおよ
び亜鉛華１号（240メツシユ）100ｇを充分混合
し、140℃に加熱して充分撹拌した後冷却し、240
メツシユの粒径に粉砕した。この被覆酸化亜鉛は
ボールミルを用いて固形分50重量％（酸化亜鉛換
算25重量％）の水性分散体として次の配合処方に
供する。
ゴムラテツクス組成物の調製
表−１の配合処方によつてゴムラテツクス組成
物１〜６を常法により調製した。
The present invention relates to a rubber latex composition containing natural rubber latex as an essential base rubber component. When zinc oxide is added as a vulcanization accelerator to a rubber latex composition that uses natural rubber as a base rubber, a portion of the zinc oxide reacts with ammonia in the natural rubber to form a complex salt Zn(NH 3 ) 2+ o . However, since this complex salt forms an insoluble zinc salt with the soap or protective colloid protein on the surface of the latex particles, the blending system becomes unstable and the viscosity increases. As a solution to this problem, a method of adding potassium hydroxide has been proposed. However, potassium hydroxide has a strong tendency to over-stabilize latex, causing inconvenience during molding, and therefore it is very difficult to adjust its blending amount. The present invention has been made to improve the above problem, and its gist is that the rubber latex has a melting point or softening point lower than the vulcanization temperature, based on 100 parts by weight of natural rubber latex or a mixed rubber latex of natural rubber latex and synthetic rubber latex. A rubber composition containing a maximum amount of 10 parts by weight of resin-coated zinc oxide. The base rubber used in the present invention is generally natural rubber, but synthetic rubber such as isoprene rubber, polybutadiene rubber, ethylene propylene rubber, styrene-butadiene rubber, etc. may be blended as appropriate depending on the purpose. The resin that coats zinc oxide may be any resin that has a melting point or softening point below the vulcanization temperature, and is not particularly limited, but usually has a melting point or softening point of about
Coumarone resins, phenol-terpene resins, petroleum hydrocarbon resins, rosin derivatives, etc., which are heated to 120°C or lower, are used. In order to coat zinc oxide using the above resin, for example, zinc oxide ground to a predetermined particle size is sufficiently mixed with the above resin [the mixing ratio is usually zinc oxide:resin=100:1 to 100:1000 ( weight ratio)], the mixture is heated above the melting point or softening point of the resin, sufficiently stirred, and then cooled to adjust the particle size to a predetermined size. The coated zinc oxide obtained in this way is usually
It is blended into a rubber latex composition as an aqueous dispersion with a solid content of 20 to 50% by weight. The amount of coated zinc oxide is the same as the rubber component.
The amount is usually 0.1 to 5 parts by weight (calculated as zinc oxide) per 100 parts by weight. If this amount is less than 0.05 parts by weight, the ability to accelerate vulcanization will be poor, and if it is more than 10 parts by weight, it will only increase the specific gravity of the vulcanizate of the compound and will have little effect on the actual vulcanization acceleration effect, which is undesirable. . The rubber latex composition according to the present invention includes the above-mentioned base rubber, zinc oxide as a vulcanization accelerator,
In addition to sulfur as a vulcanizing agent, conventional additives,
For example, reinforcing agents, anti-aging agents, etc. may be appropriately added. The rubber latex composition obtained by the present invention exhibits extremely good storage stability, and the products obtained by vulcanization molding thereof also have good properties. Hereinafter, the present invention will be explained with reference to Examples. Examples 1 to 3 and Comparative Examples 1 to 3 Preparation of coated zinc oxide 100 g of synthetic polyterpene resin (Quinton U-185, commercially available from Nippon Zeon Co., Ltd.; softening point: 85°C) and 100 g of zinc white No. 1 (240 mesh) were thoroughly mixed. After heating to 140℃ and stirring thoroughly, cool to 240℃.
It was ground to mesh particle size. This coated zinc oxide was prepared as an aqueous dispersion with a solid content of 50% by weight (25% by weight in terms of zinc oxide) using a ball mill and used in the following formulation. Preparation of Rubber Latex Compositions Rubber latex compositions 1 to 6 were prepared in a conventional manner according to the formulations shown in Table 1.
【表】
ゴムラテツクス組成物粘度の経時変化
上記のようにして調製したゴムラテツクス組成
物の粘度を、回転粘度計（ロータ ２）を用いて
経時測定した（回転数：60rpm、温度：20℃）。
測定結果を表−２に示す（単位：センチポイ
ズ）。[Table] Change in viscosity of rubber latex composition over time The viscosity of the rubber latex composition prepared as described above was measured over time using a rotational viscometer (rotor 2) (rotation speed: 60 rpm, temperature: 20°C). The measurement results are shown in Table 2 (unit: centipoise).
【表】
加硫成形体の物性
上記ゴムラテツクス組成物１〜６を140℃で15
分間加硫し、加硫成型体1′〜6′（25cm×７cm×0.5
cm）をそれぞれ調製し、それらの物性を表−３に
示す。[Table] Physical properties of vulcanized products The above rubber latex compositions 1 to 6 were heated at 140℃ for 15 minutes.
Vulcanize for 1 minute to 6' (25 cm x 7 cm x 0.5 cm)
cm) were prepared, and their physical properties are shown in Table 3.
Claims (1)
スと合成ゴムラテツクスとの混合ゴムラテツクス
100重量部に対して、加硫温度よりも低い融点ま
たは軟化点を有する樹脂で被覆された酸化亜鉛最
大量10重量部含有するゴムラテツクス組成物。 ２ 樹脂が120℃以下の融点または軟化点を有す
るクマロン樹脂、フエノール−テルペン樹脂、石
油系炭化水素樹脂またはロジン誘導体である第１
項記載のゴムラテツクス組成物。[Claims] 1. Natural rubber latex or mixed rubber latex of natural rubber latex and synthetic rubber latex.
A rubber latex composition containing, per 100 parts by weight, a maximum amount of 10 parts by weight of zinc oxide coated with a resin having a melting point or softening point lower than the vulcanization temperature. 2 The first resin is a coumaron resin, phenol-terpene resin, petroleum hydrocarbon resin or rosin derivative having a melting point or softening point of 120°C or less
The rubber latex composition described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2581381A JPS57139133A (en) | 1981-02-23 | 1981-02-23 | Rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2581381A JPS57139133A (en) | 1981-02-23 | 1981-02-23 | Rubber composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57139133A JPS57139133A (en) | 1982-08-27 |
| JPS628450B2 true JPS628450B2 (en) | 1987-02-23 |
Family
ID=12176300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2581381A Granted JPS57139133A (en) | 1981-02-23 | 1981-02-23 | Rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57139133A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6046260A (en) * | 1998-01-13 | 2000-04-04 | Flow Polymers, Inc. | Zinc oxide dispersion |
| US6534571B1 (en) | 2001-04-25 | 2003-03-18 | Flow Polymers, Inc. | Desiccant dispersion for rubber compounds |
| KR101306675B1 (en) * | 2011-09-30 | 2013-09-10 | 평화오일씰공업주식회사 | Rubber composite of pad of a brake booster |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4843375A (en) * | 1971-09-30 | 1973-06-22 | ||
| JPS5269455A (en) * | 1975-12-08 | 1977-06-09 | Bridgestone Corp | Vulcanizable rubber compositions with improved bloom |
-
1981
- 1981-02-23 JP JP2581381A patent/JPS57139133A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4843375A (en) * | 1971-09-30 | 1973-06-22 | ||
| JPS5269455A (en) * | 1975-12-08 | 1977-06-09 | Bridgestone Corp | Vulcanizable rubber compositions with improved bloom |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57139133A (en) | 1982-08-27 |
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