JPH0255372B2 - - Google Patents
Info
- Publication number
- JPH0255372B2 JPH0255372B2 JP13639085A JP13639085A JPH0255372B2 JP H0255372 B2 JPH0255372 B2 JP H0255372B2 JP 13639085 A JP13639085 A JP 13639085A JP 13639085 A JP13639085 A JP 13639085A JP H0255372 B2 JPH0255372 B2 JP H0255372B2
- Authority
- JP
- Japan
- Prior art keywords
- calcium carbonate
- reinforcing
- serum
- rubber
- content
- 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
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 91
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 45
- 229920001971 elastomer Polymers 0.000 claims description 30
- 210000002966 serum Anatomy 0.000 claims description 25
- 230000003014 reinforcing effect Effects 0.000 claims description 24
- 229920006173 natural rubber latex Polymers 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 239000000920 calcium hydroxide Substances 0.000 description 15
- 235000011116 calcium hydroxide Nutrition 0.000 description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000012744 reinforcing agent Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000004073 vulcanization Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 3
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 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 description 2
- 150000001413 amino acids Chemical class 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 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 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 102000006395 Globulins Human genes 0.000 description 1
- 108010044091 Globulins Proteins 0.000 description 1
- 101800002189 Hevein Proteins 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- WKMZPSWMEXVKKG-XITFREQTSA-N hevein Chemical compound OC(=O)CC[C@H](N)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CS)C(=O)NCC(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](C)C(=O)NCC(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CS)C(=O)N1CCC[C@H]1C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CS)C(=O)N[C@@H](CS)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@H](C(=O)NCC(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CS)C(=O)NCC(=O)OC(=O)CC[C@H](NC(=O)[C@H](CC(O)=O)NC(=O)[C@@H](NC(=O)[C@@H](N)CO)[C@@H](C)O)C(=O)N[C@@H](CC=1C=CC(O)=CC=1)C(=O)N[C@@H](CS)C(=O)N[C@@H](CO)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC1N=CN=C1)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CS)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CO)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CS)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(O)=O)CC1=CNC2=CC=CC=C12 WKMZPSWMEXVKKG-XITFREQTSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006303 immediate early viral mRNA transcription Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010058 rubber compounding Methods 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229940034610 toothpaste Drugs 0.000 description 1
- 239000000606 toothpaste Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
〈技術分野〉
本発明は、ゴム工業において充填剤として用い
られる表面処理した炭酸カルシウムに関し、特に
高物性ゴム原料として利用できる補強性炭酸カル
シウムに関する。
〈従来技術〉
従来、石灰乳に二酸化炭素を吹き込んで、でき
た沈澱を濾過、乾燥、粉砕してつくる炭酸カルシ
ウムは、沈澱炭酸カルシウム（軽質炭酸カルシウ
ム）と呼ばれ、顔料、塗料、製紙、ハミガキ粉等
に用いられ、特にゴム工業においては安価な充填
剤として非常に多く用いられている。
しかしながら一般にゴム配合剤としての軽質炭
酸カルシウムを増量していくと、ゴムの引張強
さ、引張応力が低下し、加硫速度が遅くなる等の
欠点があり、これらを改善する目的で軽質炭酸カ
ルシウム表面に脂肪酸やロジン酸等の樹脂酸など
をコーテイング（被覆）することが行われている
が、この改善効果はそれ程期待できず、より高物
性のゴムを製造するために、より補強性の高い高
品質の軽質炭酸カルシウムが望まれている。
一方天然ゴムラテツクスからRSS（リブドスモ
ークド シート）などの天然ゴムを製造する際に
排出される漿液は産業廃棄物として公害問題とな
り、有効利用できれば望ましい。
〈発明の目的〉
本発明のの目的は、前述した補強性軽質炭酸カ
ルシウムの欠点を改善し、補強性が従来より大き
く、高物性ゴムを製造することのできる補強性炭
酸カルシウムを提供することにある。
〈発明の構成〉
本発明では軽質炭酸カルシウム粒子に天然ゴム
ラテツクスからゴム分を実質的に除去した漿液中
の成分を表面被覆したことを特徴とする補強性炭
酸カルシウムである。
ここで、前記漿液中の成分の含有量が0.5〜
10wt％である補強性炭酸カルシウムであること
が良い。
また、前記漿液中の成分が、平均粒径10〜
100μの粉末である補強性炭酸カルシウムである
ことが好ましい。
以下に本発明を更に詳細に説明する。
軽質炭酸カルシウムは以下のように製造され
る。石灰岩を粗砕した後、焼成して生石灰とし、
これを水または水蒸気で水和して消石灰とし、水
中に消石灰の微粉を分散させた乳状の懸濁液（石
灰乳）をうる。石灰乳に炭酸ガスを吹き込んでで
きた沈澱を濾過、乾燥、粉砕して軽質炭酸カルシ
ウムとする。
H2O CO2
↓ ↓
CaCO3―→CaO―→Ca（OH）2―→CaCO3
（重質炭酸カルシウム）（軽質炭酸カルシウム）
従来の補強性炭酸カルシウムは、石灰乳に炭酸
ガスを吹き込む工程でロジン酸等の樹脂酸や脂肪
酸などを石灰乳中に入れ、表面処理をすることが
行われている。ロジン酸や脂肪酸は高価なばかり
でなく補強性効果も充分ではなかつた。
発明者は高価なロジン酸等にかえて、従来廃棄
されていた天然ゴムラテツクスからゴム分を実質
的に除除去した漿液中の成分を軽質炭酸カルシウ
ムに被覆すると、より補強性効果があることを見
出し本発明に至つたものである。
本発明は天然ゴムラテツクスから得られる漿液
または漿液から得られる物質を軽質炭酸カルシウ
ムに被覆して補強性炭酸カルシウムとする。
天然ゴムラテツクスの成分は１例をあげると表
１に示す組成である。
<Technical Field> The present invention relates to surface-treated calcium carbonate used as a filler in the rubber industry, and particularly to reinforcing calcium carbonate that can be used as a raw material for rubber with high physical properties. <Prior art> Calcium carbonate, which is traditionally produced by blowing carbon dioxide into milk of lime and filtering, drying, and pulverizing the resulting precipitate, is called precipitated calcium carbonate (light calcium carbonate), and is used in pigments, paints, paper manufacturing, and toothpaste. It is used in powders, etc., and is especially widely used as an inexpensive filler in the rubber industry. However, in general, when increasing the amount of light calcium carbonate as a rubber compounding agent, there are drawbacks such as a decrease in the tensile strength and stress of the rubber, and a slow vulcanization rate. Although the surface is coated with resin acids such as fatty acids and rosin acids, the improvement effect cannot be expected to be that great. High quality light calcium carbonate is desired. On the other hand, the serum discharged when manufacturing natural rubber such as RSS (ribbed smoked sheets) from natural rubber latex is an industrial waste and poses a pollution problem, so it would be desirable if it could be used effectively. <Object of the Invention> The object of the present invention is to improve the drawbacks of the above-mentioned reinforcing light calcium carbonate, and to provide a reinforcing calcium carbonate which has greater reinforcing properties than conventional ones and can produce rubber with high physical properties. be. <Structure of the Invention> The present invention provides a reinforcing calcium carbonate characterized in that light calcium carbonate particles are surface-coated with components in serum obtained by substantially removing the rubber content from natural rubber latex. Here, the content of the component in the serum is 0.5 to
Preferably, the reinforcing calcium carbonate is 10wt%. In addition, the components in the serum have an average particle size of 10 to
Preferably it is a reinforcing calcium carbonate which is a 100μ powder. The present invention will be explained in more detail below. Light calcium carbonate is produced as follows. After crushing the limestone, it is fired to make quicklime.
This is hydrated with water or steam to produce slaked lime, and a milky suspension (milk of lime) in which fine powder of slaked lime is dispersed in water is obtained. The precipitate formed by blowing carbon dioxide gas into milk of lime is filtered, dried, and crushed to produce light calcium carbonate. H 2 O CO 2 ↓ ↓ CaCO 3 ―→CaO―→Ca(OH) 2 ―→CaCO 3 (Heavy calcium carbonate) (Light calcium carbonate) Conventional reinforcing calcium carbonate is produced by blowing carbon dioxide gas into milk of lime. In this process, resin acids such as rosin acid, fatty acids, etc. are added to milk of lime for surface treatment. Rosin acids and fatty acids are not only expensive, but also do not have sufficient reinforcing effects. The inventor found that, instead of using expensive rosin acid, etc., coating light calcium carbonate with a component of serum obtained by substantially removing the rubber content from conventionally discarded natural rubber latex produced a more reinforcing effect. This led to the present invention. In the present invention, a reinforcing calcium carbonate is obtained by coating light calcium carbonate with serum obtained from natural rubber latex or a substance obtained from the serum. One example of the components of natural rubber latex is shown in Table 1.
【表】
この天然ゴムラテツクスからゴム炭化水素を除
いたものを漿液といい、一般に工業的には漿液中
には、ごく少量のゴム分が含まれているのが普通
である。
漿液の成分は天然ゴムラテツクスの成分によつ
て異なり、厳密に限定することができないが、α
−グロブリン、ヘベインなどの蛋白質、脂肪酸、
アミノ酸、糖分、水、Ｋ、Mg、Cu、Fe、Na、
Ca、Ｐ等の灰分（無機成分）その他の微量成分
である。漿液中には約0.5wt％のゴム分と非ゴム
分約2.0〜5.0wt％を含む。これを遠心分離等によ
りゴム分を除去して用いてもよい。
本発明は漿液中または濃縮漿液中に直接消石灰
を分散懸濁させ、漿液または濃縮漿液中の非ゴム
分を炭酸ガス吹き込みによつて析出する軽質炭酸
カルシウムに吸着させ、濾過、乾燥するが、スプ
レードライ等の方法を用いてコーテイングしても
よい。また、天然ゴムラテツクスから得られる漿
液を凍凍結乾燥、溶剤抽出等の方法で非ゴム分を
分離してこれを石灰乳中に添加してもよい。
特に漿液中の成分を、以下のようにしてえられ
る平均粒径10〜100μの粉末として石灰乳中に添
加する方が工程が容易となるため、より好まし
い。
天然ゴムラテツクスのゴム成分を蟻酸等で凝固
除去し、残りの漿液を濃縮して、ノズル型やデイ
スク型のスプレードライヤーを用いて150゜〜250
℃の高温雰囲気の密閉容器内で微小滴状にて供給
し、水分を蒸発させて、平均粒径10〜100μの粉
末状とする。10μ未満の粉末であると吸湿して再
凝固しやすくなり、得られる粉末がダンゴ状のも
のとなり微粒化しない。100μを超えると水や溶
剤に溶解しにくくなる。10〜100μの微粒子であ
ると石灰乳に容易に溶解するため、均質に混入
し、炭酸カルシウム粒子表面に均等に付着し、均
質な補強性炭酸カルシウムをうることができる。
石灰乳への添添加量は軽質炭酸カルシウム粒子
表面に0.5〜10wt％の含有量として得られるよう
に予め実験的に求めた量添加する。
このように軽質炭酸カルシウム粒子への天然ゴ
ムラテツクス漿液中の成分の表面避覆はいずれの
方法を用いてもよいが補強性炭酸カルシウム成品
につき含有量0.5〜10wt％とすることが好ましい。
0.5wt％未満であると補強性炭酸カルシウムをゴ
ム補強剤として用いた場合に本発明の効果が得ら
れない。10wt％を超えると製品としての炭酸カ
ルシウムが凝集しやすくなるし、また炭酸カルシ
ウムの補強性の効果が薄くなるからである。
〈実施例〉
実施例
天然ゴムラテツクスからゴム分を実質的に除去
した漿液（非ゴム成分濃度4.4％、見掛け粘度
4.2cp）を、28000r.p.mの回転数の大川原化工機
(株)製Ｌ−12型のデイスクドライヤーを用い、入口
温度170℃、出口温度60℃中で、乾燥微粉末化し
た。微粉末の平均粒径は、20〜30μ球状で、水分
率3.8％、粒子の色淡黄〜白であり、良好な粉末
状態であつた。なおこの微粉末中の蛋白質アミノ
酸の日本食品分析センターによる分析結果果を表
２に示す。
上記微粉末25ｇを濃度40wt％の石灰乳１中
にCO2ガスとともに入れ本発明の補強性炭酸カル
シウムを得た。炭酸カルシウムへの非ゴム成分の
含有量は2wt％であつた。べつに上記微粉末50ｇ
を濃度40wt％の石灰乳１中にCO2ガスととも
に入れ同様に炭酸カルシウムへの非ゴム成分の含
有量4wt％のものを得た。
同様にし、微粉末100ｇをを濃度40wt％の石灰
乳１中にCO2ガスとともに入れ、同様に炭酸カ
ルシウムへの非ゴム成分の含有量8wt％のものを
得た。
また、同様操作により非ゴム成分含有量1wt％
の炭酸カルシウムも得た。[Table] This natural rubber latex from which rubber hydrocarbons have been removed is called serum, and in general, industrially, serum usually contains a very small amount of rubber. The components of the serum vary depending on the components of the natural rubber latex and cannot be strictly limited, but α
- Proteins such as globulin and hevein, fatty acids,
Amino acids, sugar, water, K, Mg, Cu, Fe, Na,
Ash (inorganic components) such as Ca and P and other trace components. Serum contains approximately 0.5 wt% rubber and approximately 2.0 to 5.0 wt% non-rubber. This may be used after removing the rubber component by centrifugation or the like. In the present invention, slaked lime is directly dispersed and suspended in serum or concentrated serum, and the non-gum content in the serum or concentrated serum is adsorbed on precipitated light calcium carbonate by blowing carbon dioxide gas, filtered, and dried. Coating may be performed using a method such as drying. Alternatively, non-rubber components may be separated from the serum obtained from natural rubber latex by a method such as freeze-freeze drying or solvent extraction, and this may be added to the milk of lime. In particular, it is more preferable to add the components in the serum to the milk of lime in the form of a powder with an average particle size of 10 to 100 μ, which can be obtained as follows, because the process becomes easier. The rubber component of natural rubber latex is coagulated and removed with formic acid, etc., the remaining serum is concentrated, and then dried at 150° to 250° using a nozzle-type or disk-type spray dryer.
It is supplied in the form of microdroplets in a closed container in a high-temperature atmosphere at ℃, and water is evaporated to form a powder with an average particle size of 10 to 100μ. If the powder is less than 10μ, it absorbs moisture and is likely to re-solidify, resulting in a lump-like powder that is not atomized. If it exceeds 100μ, it becomes difficult to dissolve in water or solvent. Fine particles of 10 to 100 microns easily dissolve in milk of lime, so they are mixed homogeneously and evenly adhere to the surface of calcium carbonate particles, making it possible to obtain homogeneous reinforcing calcium carbonate. The amount to be added to the milk of lime is experimentally determined in advance so as to obtain a content of 0.5 to 10 wt% on the surface of the light calcium carbonate particles. As described above, any method may be used to cover the surface of the components in the natural rubber latex serum onto the light calcium carbonate particles, but the content is preferably 0.5 to 10 wt% for the reinforcing calcium carbonate product.
If the content is less than 0.5 wt%, the effects of the present invention cannot be obtained when reinforcing calcium carbonate is used as a rubber reinforcing agent. This is because if it exceeds 10 wt%, the calcium carbonate as a product tends to aggregate, and the reinforcing effect of calcium carbonate becomes weaker. <Example> Example Serum from which the rubber content was substantially removed from natural rubber latex (non-rubber component concentration 4.4%, apparent viscosity
4.2cp), Okawara Kakoki with a rotation speed of 28000r.pm
The mixture was dried and pulverized using an L-12 type disc dryer manufactured by Co., Ltd. at an inlet temperature of 170°C and an outlet temperature of 60°C. The fine powder had an average particle size of 20 to 30 microns spherical, a moisture content of 3.8%, and a particle color of pale yellow to white, and was in a good powder state. Table 2 shows the analysis results of the protein amino acids in this fine powder by the Japan Food Research Center. 25 g of the above fine powder was placed in milk of lime 1 having a concentration of 40 wt% together with CO 2 gas to obtain reinforcing calcium carbonate of the present invention. The content of non-rubber components in calcium carbonate was 2wt%. 50g of the above fine powder
was placed in milk of lime 1 with a concentration of 40 wt% together with CO 2 gas to obtain calcium carbonate with a non-rubber component content of 4 wt%. In the same manner, 100 g of fine powder was placed in milk of lime 1 having a concentration of 40 wt% together with CO 2 gas to obtain a calcium carbonate with a non-rubber component content of 8 wt%. In addition, by the same operation, the non-rubber component content was 1wt%.
of calcium carbonate was also obtained.
【表】【table】
【表】
補強剤として上記補強性炭酸カルシウムを用い
て表３に示す組成で通常の方法で配合し、混合、
混練してゴム組成物を作成した。
比較例
べつに比較として、表３に示すように軽質炭酸
カルシウム（比較例１）と市販のロジン酸コーテ
イング補強性炭酸カルシウム（比較例２）を補強
剤として用い、補強剤以外は実施例と同様の組成
で同様の方方法で配合し、混合、混練してゴム組
成物を作成した。
上記の実施例と比較例のゴム組成物について以
下の測定を行つた。結果を表４に示す。
未加硫ゴムの物性 １） スコーチタイム
２） 加硫速度
３） ムーニー粘度
次に148℃×30分で加硫処理した後のゴム組成
物について以下の測定を行つた。結果を表４に示
す。
加硫ゴム物性 １） 引張強さ（Kg/cm2）
２） 伸び（％）
３） 300％引張応力（Kg/cm2）
４） 硬さ（JIS）
表３、表４から、本発明の補強性炭酸カルシウ
ムを補強剤として用いたゴム組成物は、スコーチ
タイムを改良し（短かくなり）、加硫速度が向上
する。ムーニー粘度が低くなり加工性容易となる
ことがわかる。[Table] Using the above-mentioned reinforcing calcium carbonate as a reinforcing agent, the composition shown in Table 3 was blended in the usual manner, mixed,
A rubber composition was prepared by kneading. Comparative Example As a comparison, as shown in Table 3, light calcium carbonate (Comparative Example 1) and commercially available rosin acid coating reinforcing calcium carbonate (Comparative Example 2) were used as reinforcing agents, and the same method as in the example was used except for the reinforcing agent. A rubber composition was prepared by blending, mixing and kneading in the same manner as the composition. The following measurements were performed on the rubber compositions of the above examples and comparative examples. The results are shown in Table 4. Physical properties of unvulcanized rubber 1) Scorch time 2) Vulcanization rate 3) Mooney viscosity Next, the following measurements were performed on the rubber composition after vulcanization at 148°C for 30 minutes. The results are shown in Table 4. Vulcanized rubber physical properties 1) Tensile strength (Kg/cm 2 ) 2) Elongation (%) 3) 300% tensile stress (Kg/cm 2 ) 4) Hardness (JIS) From Tables 3 and 4, it can be seen that the Rubber compositions using reinforcing calcium carbonate as a reinforcing agent have improved (shorter) scorch times and increased vulcanization rates. It can be seen that the Mooney viscosity is lower and processability is easier.
【表】【table】
【表】
〈発明の効果〉
本発明の補強性炭酸カルシウムは、軽質炭酸カ
ルシウム粒子に、天然ゴムラテツクス漿液からゴ
ム分を実質的に除去した漿液中の成分を表面被覆
してあるので、ゴム組成物の補強剤として用いる
と、従来の樹脂酸等をコーテイングした補強性炭
酸カルシウムを補強剤として用いた場合に比較し
て以下の効果を有する。
引張強さ、300％引張応力等のゴム物性の改
善効果が著しく大きい。
スコーチタイムの遅延が押えられる。
加硫速度の遅延が押えられる。
ムーニー粘度が低くなり混合等の加工が容易
になる。
また、従来天然ゴムラテツクスからRSS（リブ
ド スモークド シート）などの天然ゴムを製造
する際に排出される漿液を有効利用することがで
き公害問題を解決する。[Table] <Effects of the Invention> In the reinforcing calcium carbonate of the present invention, light calcium carbonate particles are surface-coated with components in the serum from which the rubber content has been substantially removed from the natural rubber latex serum. When used as a reinforcing agent, it has the following effects compared to the case where reinforcing calcium carbonate coated with a conventional resin acid or the like is used as a reinforcing agent. The effect of improving rubber physical properties such as tensile strength and 300% tensile stress is significant. Scorch time delay is suppressed. The delay in vulcanization speed is suppressed. Mooney viscosity is lower, making processing such as mixing easier. In addition, the serous fluid discharged when manufacturing natural rubber such as RSS (ribbed smoked sheet) from conventional natural rubber latex can be effectively used, solving pollution problems.
Claims (1)
スからゴム分を実質的に除去した漿液中の成分を
表面被覆したことを特徴とする補強性炭酸カルシ
ウム。 ２ 前記漿液中の成分の含有量が0.5〜10wt％で
ある特許請求の範囲第１項に記載の補強性炭酸カ
ルシウム。 ３ 前記漿液中の成分が、平均粒径10〜100μの
粉末である特許請求の範囲第１項または第２項に
記載の補強性炭酸カルシウム。[Scope of Claims] 1. A reinforcing calcium carbonate characterized in that light calcium carbonate particles are surface-coated with a component of serum obtained by substantially removing the rubber content from natural rubber latex. 2. The reinforcing calcium carbonate according to claim 1, wherein the content of the component in the serum is 0.5 to 10 wt%. 3. The reinforcing calcium carbonate according to claim 1 or 2, wherein the component in the serum is a powder with an average particle size of 10 to 100 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13639085A JPS61295232A (en) | 1985-06-22 | 1985-06-22 | Reinforcing calcium carbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13639085A JPS61295232A (en) | 1985-06-22 | 1985-06-22 | Reinforcing calcium carbonate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61295232A JPS61295232A (en) | 1986-12-26 |
| JPH0255372B2 true JPH0255372B2 (en) | 1990-11-27 |
Family
ID=15174037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13639085A Granted JPS61295232A (en) | 1985-06-22 | 1985-06-22 | Reinforcing calcium carbonate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61295232A (en) |
-
1985
- 1985-06-22 JP JP13639085A patent/JPS61295232A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61295232A (en) | 1986-12-26 |
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