JPH0976251A - Method for measuring vulcanization reaction and method and apparatus for preparing rubber product - Google Patents
Method for measuring vulcanization reaction and method and apparatus for preparing rubber productInfo
- Publication number
- JPH0976251A JPH0976251A JP26226595A JP26226595A JPH0976251A JP H0976251 A JPH0976251 A JP H0976251A JP 26226595 A JP26226595 A JP 26226595A JP 26226595 A JP26226595 A JP 26226595A JP H0976251 A JPH0976251 A JP H0976251A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- vulcanization
- mold
- measuring
- current value
- 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.)
- Granted
Links
- 238000004073 vulcanization Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims description 25
- 238000000465 moulding Methods 0.000 claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000013329 compounding Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010068 moulding (rubber) Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000013040 rubber vulcanization Methods 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、加硫反応の測定
方法およびゴム製品の製造方法および装置に係り、更に
詳しくはゴム配合物に交流電流を印加して誘電正接（ｔ
ａｎδ）または電流値を測定し、ゴムの加硫反応の進行
をリアルタイムで測定するようにしたものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a vulcanization reaction and a method and apparatus for producing a rubber product, and more specifically, a dielectric loss tangent (t
an δ) or an electric current value and measure the progress of the vulcanization reaction of the rubber in real time.
【０００２】[0002]
【従来の技術】例えばゴムの物理的性質を改善して弾
性、引っ張り強度、耐摩耗性等を付与するために加硫が
行なわれている。加硫程度において、未加硫や過加硫の
場合は、いずれも製品品質を低下させる。従って最適加
硫条件の設定は、製品の品質の安定性を確保するために
重要である。BACKGROUND OF THE INVENTION For example, vulcanization has been carried out in order to improve the physical properties of rubber to impart elasticity, tensile strength, wear resistance and the like. In terms of the degree of vulcanization, both unvulcanized and over-vulcanized products deteriorate the product quality. Therefore, setting the optimum vulcanization conditions is important for ensuring the stability of product quality.
【０００３】従来、最適加硫条件の設定は主として次の
二通りの方法によって行なわれていた。その一つはキュ
ラストメータ、レオメータ等の加硫試験機を使用する方
法で、ゴムに各種の材料（配合剤）を配合したゴム配合
物を上記試験機にかけ、種々の温度で加硫試験を行っ
て、加熱時間とゴムの粘性増加によるトルクー時間曲線
から最適加硫条件を設定する方法である。他の一つは、
製品製造用の金型を使用し、実際にゴム配合物を加硫し
てゴム製品を製造し、その性能テストを行って、最適加
硫条件を設定する方法である。Conventionally, the optimum vulcanization conditions have been set mainly by the following two methods. One of them is to use a vulcanization tester such as a curast meter or rheometer. Apply a rubber compound prepared by mixing various materials (compounding agents) to rubber in the above tester and perform a vulcanization test at various temperatures. In this method, the optimum vulcanization condition is set from the torque-time curve due to heating time and increase in rubber viscosity. The other one is
This is a method of actually vulcanizing a rubber compound to manufacture a rubber product using a mold for manufacturing a product, performing a performance test of the rubber product, and setting optimum vulcanization conditions.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記した従来
の方法、つまり試験機により最適加硫条件（加硫温度、
加硫時間）を決め、或いは製造金型でゴム配合物を加硫
してテストピースを製造したとしても、加硫試験機での
試験或いはテストピースの製造と、実際にゴム製品を製
造する場合とでは、同じ条件下で加硫することは困難で
ある。However, the optimum vulcanization conditions (vulcanization temperature,
Even if you decide the vulcanization time) or vulcanize the rubber compound with the production mold to produce the test piece, you can test with the vulcanization tester or produce the test piece and actually produce the rubber product. It is difficult to vulcanize under the same conditions.
【０００５】その主な原因の一つがゴム配合物中におけ
る配合剤の分散状態の不均一性にある。つまり、混練り
工程において粘度の高いゴム中に配合剤を均一に分散す
ることは困難であり、試験機やテストピースから導き出
した最適加硫条件と実際の製造条件とを同一にしても、
上記配合剤が分散バラツキ状態にあるゴム配合物でゴム
製品を製造した場合は、製品によって未加硫や過加硫の
状態が発生し製品品質のバラツキが生じる。One of the main causes is the non-uniformity of the dispersion state of the compounding agent in the rubber compound. That is, it is difficult to uniformly disperse the compounding agent in the rubber having a high viscosity in the kneading step, and even if the optimum vulcanizing conditions and the actual manufacturing conditions derived from the test machine or the test piece are the same,
When a rubber product is manufactured with a rubber compound in which the compounding agent is in a dispersion variation state, the product may be in an unvulcanized state or an overvulcanized state, which causes a variation in product quality.
【０００６】また、他の原因としては、金型の開閉に伴
う金型やその周辺の熱履歴の変化である。つまり、実際
に製品を製造する場合は、金型を開いて製品を取り出
し、その後閉じるという工程があり、金型が開いている
時間は必ずしも一定ではない。金型が開いている時間が
長ければそれだけ金型は冷却され、金型の温度が変化す
る。そうすると、加硫時間を同じにしても加硫温度は同
じにはならず、ゴムに加わる熱履歴が毎回異なる。従っ
て試験機やテストピースから導き出した最適加硫条件を
同一にしても、未加硫や過加硫の状態が発生し製品品質
のバラツキが生じる。Another cause is a change in heat history of the mold and its surroundings due to opening and closing of the mold. That is, when actually manufacturing a product, there is a step of opening the mold, taking out the product, and then closing the mold, and the time during which the mold is open is not always constant. The longer the mold is open, the cooler the mold is and the more the mold temperature changes. Then, even if the vulcanization time is the same, the vulcanization temperature is not the same, and the thermal history applied to the rubber is different every time. Therefore, even if the optimum vulcanization conditions derived from the tester or the test piece are the same, unvulcanized or over-vulcanized states occur and the product quality varies.
【０００７】製品品質のバラツキが発生するのを防止す
るためには、被加硫ゴム毎に最適加硫条件の下で製品を
製造すればよい。本発明者等は、実際に製品を製造する
金型中のゴムの加硫反応の進行を直接リアルタイムで測
定し、加硫完了時点で製品を取り出せば品質のバラツキ
は防止できることに着目した。In order to prevent the occurrence of variations in product quality, the product may be manufactured under optimum vulcanization conditions for each rubber to be vulcanized. The present inventors have paid attention to the fact that the progress of the vulcanization reaction of the rubber in the mold for actually producing the product is directly measured in real time and the product can be taken out at the time of completion of the vulcanization to prevent the quality variation.
【０００８】そこで問題となるのは、加硫中のゴムの加
硫進行程度がどのようにしたらわかるかということであ
る。本発明者等はこの点について更に研究を重ね、金型
に取り付けた電極に交流電流を印加して被加硫ゴムの誘
電正接（ｔａｎδ）または電流値を測定した曲線と、試
験機から得られた加熱時間とゴムの粘性増加によるトル
クー時間曲線は相関関係にあることを知見した、本発明
はこの知見に基づいて完成したものである。Then, the problem is how to know the progress of vulcanization of the rubber during vulcanization. The present inventors further conducted research on this point and obtained a curve obtained by measuring the dielectric loss tangent (tan δ) or the current value of the vulcanized rubber by applying an alternating current to the electrode attached to the mold and obtained from the tester. It was found that there is a correlation between the heating time and the torque-time curve due to the increase in rubber viscosity, and the present invention has been completed based on this finding.
【０００９】そこで本発明の目的は、被加硫ゴムに電圧
を印加して誘電正接（ｔａｎδ）または電流値を測定
し、これによってゴムの加硫反応の進行を測定する方法
を提供することにある。また本発明の他の目的は、上記
測定方法を利用したゴム製品の製造方法および装置を提
供することにある。Therefore, an object of the present invention is to provide a method for measuring the progress of the vulcanization reaction of rubber by applying a voltage to the rubber to be vulcanized and measuring the dielectric loss tangent (tan δ) or the current value. is there. Another object of the present invention is to provide a method and apparatus for manufacturing a rubber product using the above measuring method.
【００１０】[0010]
【課題を解決するための手段】上記課題を解決し目的を
達成するための手段は次のとおりである。第１の手段に
あっては、ゴムの加硫反応の進行を測定する方法であっ
て、交流電圧を印加して加硫反応進行中のゴム配合物の
誘電正接（ｔａｎδ）または電流値を測定することを特
徴とする、加硫反応の測定方法である。Means for solving the above problems and achieving the object are as follows. The first means is a method for measuring the progress of a rubber vulcanization reaction, in which an AC voltage is applied to measure a dielectric loss tangent (tan δ) or a current value of a rubber compound during the progress of the vulcanization reaction. Is a method for measuring a vulcanization reaction.
【００１１】第２の手段にあっては、金型に設けられた
電極に交流電圧が印加されることを特徴とする、第１の
手段に係る加硫反応の測定方法である。In the second means, the vulcanization reaction measuring method according to the first means is characterized in that an AC voltage is applied to the electrodes provided on the mold.
【００１２】第３の手段にあっては、ゴム製品の製造方
法であって、金型にゴム配合物を充填し、成形加硫しな
がらゴム配合物の誘電正接（ｔａｎδ）または電流値を
測定するステップ、予め設定した誘電正接（ｔａｎδ）
または電流値が測定されたときに成形加硫を停止するス
テップ、を含むことを特徴とする、ゴム製品の製造方法
である。The third means is a method for manufacturing a rubber product, in which a die is filled with the rubber compound and the dielectric loss tangent (tan δ) or current value of the rubber compound is measured while molding and vulcanizing. Step, preset dielectric loss tangent (tan δ)
Or a step of stopping molding vulcanization when a current value is measured, the method for producing a rubber product.
【００１３】第４の手段にあっては、金型でゴム配合物
を成形し加硫する装置であって、上記金型にゴム配合物
の誘電正接（ｔａｎδ）または電流値を測定する電極が
設けられていることを特徴とする、ゴム製品の製造装置
である。The fourth means is an apparatus for molding and vulcanizing a rubber compound in a mold, wherein an electrode for measuring the dielectric loss tangent (tan δ) or current value of the rubber compound is provided in the mold. An apparatus for manufacturing a rubber product, which is provided.
【００１４】上記ｔａｎδは、試料の複素誘電率（ε
* ）の実数部の誘電率ε' と虚数部のε" の比（ε" ／
ε' ）として求められる。その他ゴムの加硫反応の進行
を測定する手段としては、直流漏れ電流法、直流重畳
法、低周波重畳法、直流成分法を利用したものを使用す
ることもできる。The above tan δ is the complex permittivity (ε
* ) Ratio of permittivity ε'of real part and ε "of imaginary part (ε" /
ε '). In addition, as a means for measuring the progress of the vulcanization reaction of rubber, it is possible to use a means utilizing a direct current leakage method, a direct current superposition method, a low frequency superposition method, or a direct current component method.
【００１５】[0015]
【作用】予めゴム配合物の最適加硫条件を試験機で測定
しておき、それと共にゴム配合物の誘電正接（ｔａｎ
δ）または電流値を測定しておく。ゴム配合物を成形加
硫しながら当該ゴム配合物に交流電圧を印加し、ゴム配
合物の誘電正接（ｔａｎδ）または電流値を測定する。
測定値が予め設定された誘電正接（ｔａｎδ）または電
流値となったら加硫を停止し、これによって最適加硫が
行なわれたゴム製品を得ることができる。The optimum vulcanization condition of the rubber compound is measured in advance by a testing machine, and the dielectric loss tangent (tan) of the rubber compound is also measured.
δ) or measure the current value. While molding and vulcanizing the rubber compound, an AC voltage is applied to the rubber compound and the dielectric loss tangent (tan δ) or current value of the rubber compound is measured.
When the measured value reaches a preset dielectric loss tangent (tan δ) or current value, vulcanization is stopped, and thereby a rubber product that has been optimally vulcanized can be obtained.
【００１６】[0016]
【発明の実施の形態】本発明を図面に示した実施の形態
に基づき更に詳細に説明する。図１は電極を装備した金
型の説明図である。金型は上型１１と下型１２とから構
成されている。下型１２の上面中央には平板状のキャビ
ティ１３が形成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 is an illustration of a mold equipped with electrodes. The mold is composed of an upper mold 11 and a lower mold 12. A flat plate-shaped cavity 13 is formed in the center of the upper surface of the lower mold 12.
【００１７】上型１１の中央と下型１２の中央にはそれ
ぞれ電極１４，１５が表面を露出させた状態で埋設され
ている。電極１４，１５は絶縁体（テフロン）１６で周
囲とは絶縁されている。符号１７はゴム及び金型の温度
測定用の熱電対、Ｒはゴムである。Electrodes 14 and 15 are embedded in the center of the upper mold 11 and the center of the lower mold 12 with their surfaces exposed. The electrodes 14 and 15 are insulated from the surroundings by an insulator (Teflon) 16. Reference numeral 17 is a thermocouple for measuring the temperature of rubber and a mold, and R is rubber.
【００１８】図２は、下記の表１に示す配合のＮＢＲゴ
ムを加硫し、加硫反応の進行に伴うトルクの時間変化を
示した図である。加硫反応追跡の手段として確立された
方法である加硫試験機（モンサント社製ＭＤＲ２００
０）を用いて加硫温度１５０℃で測定した。加硫開始後
３分以降から急激なトルク上昇があり、その後の安定化
が見られる。加硫開始後５分を経過したところでトルク
変化が小さくなり加硫が十分進行したことがわかる。FIG. 2 is a diagram showing the change over time in torque with the progress of the vulcanization reaction after vulcanizing the NBR rubber having the composition shown in Table 1 below. A vulcanization tester (MDR200 manufactured by Monsanto Co., Ltd.), which is a method established as a means for tracing the vulcanization reaction.
0) was used and the vulcanization temperature was measured at 150 ° C. There is a sharp torque increase from 3 minutes after the start of vulcanization, and then stabilization is observed. After 5 minutes from the start of vulcanization, it was found that the torque change became small and the vulcanization proceeded sufficiently.
【００１９】[0019]
【表１】 [Table 1]
【００２０】図３は誘電正接（ｔａｎδ）−時間曲線を
示す図である。図１に示した金型内に表１に示した配合
のＮＢＲゴムを充填し、交流電圧を２００Ｖを印加し、
１５０℃で加硫した。加硫開始後２〜３分以降のｔａｎ
δの急上昇とその後の安定化は図２に示したトルクー時
間曲線と類似しており、誘電正接（ｔａｎδ）を測定す
ることによって加硫反応を追跡して最適加硫条件を得る
ことができることが分かる。FIG. 3 is a diagram showing a dielectric loss tangent (tan δ) -time curve. The mold shown in FIG. 1 was filled with NBR rubber having the composition shown in Table 1, and an AC voltage of 200 V was applied.
Vulcanized at 150 ° C. Tan after 2-3 minutes after the start of vulcanization
The rapid rise of δ and the subsequent stabilization are similar to the torque-time curve shown in FIG. 2, and it is possible to trace the vulcanization reaction by measuring the dielectric loss tangent (tan δ) to obtain the optimum vulcanization condition. I understand.
【００２１】図４は電流−加硫時間の変化を示す図であ
る。図１に示した金型内に表１に示す配合のＮＢＲゴム
を充填し、交流電圧１２０Ｖを印加し、１５０℃で加硫
した。電流は加硫開始後５分を過ぎると急激に上昇し１
１分を過ぎるとほぼ一定となりその形は図２に非常に類
似している。つまり、ゴム配合物中を流れる電流値を測
定することによって加硫反応を追跡して最適加硫条件を
得ることができることが分かる。FIG. 4 is a diagram showing changes in current-vulcanization time. The mold shown in FIG. 1 was filled with NBR rubber having the composition shown in Table 1, an AC voltage of 120 V was applied, and vulcanization was performed at 150 ° C. The current rises sharply 5 minutes after the start of vulcanization
After one minute, it becomes almost constant and its shape is very similar to that of FIG. That is, it can be seen that the vulcanization reaction can be traced and the optimum vulcanization conditions can be obtained by measuring the value of the current flowing through the rubber compound.
【００２２】図５は加硫反応の進行に伴う引っ張り強度
の時間変化を示した図である。加硫反応がほぼ完結した
加硫時間１０分間までは時間と共に引っ張り強度は増加
するがそれ以降は略一定か僅かに低下した。誘電正接
（ｔａｎδ）−時間曲線および電流−加硫時間の変化を
示す図と良く対応していることがわかる。FIG. 5 is a diagram showing the change over time in the tensile strength with the progress of the vulcanization reaction. The tensile strength increased with time until the vulcanization time was 10 minutes, at which the vulcanization reaction was almost completed, but thereafter, the tensile strength was substantially constant or slightly decreased. It can be seen that it corresponds well with the figure showing the changes in the dielectric loss tangent (tan δ) -time curve and the current-vulcanization time.
【００２３】[0023]
【比較例】図６は硫黄と加硫剤を含まないゴム配合物の
誘電正接（ｔａｎδ）−時間曲線を示す図である。誘電
正接（ｔａｎδ）は徐々に上昇するのみであり、加硫反
応が起こってないことがわかる。Comparative Example FIG. 6 is a diagram showing a dielectric loss tangent (tan δ) -time curve of a rubber compound containing no sulfur and a vulcanizing agent. It can be seen that the dielectric loss tangent (tan δ) only gradually rises and that the vulcanization reaction has not occurred.
【００２４】図７はｔ90（トルク）とｔａｎδ−時間曲
線から求めたｔ90（ｔａｎδ）の相関性を示す図であ
る。一般に最適加硫時間は図２のトルクー時間曲線から
求めた９０％加硫時間ｔ90（トルク）が採用されてい
る。ｔ90（トルク）とｔａｎδ−時間曲線から求めたｔ
90（ｔａｎδ）には相関性があり、非常に良い直線性が
見られる。FIG. 7 shows the correlation between t 90 (torque) and t 90 (tan δ) obtained from the tan δ-time curve. Generally, 90% vulcanization time t 90 (torque) obtained from the torque-time curve of FIG. 2 is adopted as the optimum vulcanization time. t calculated from t 90 (torque) and tan δ-time curve
90 (tan δ) has a correlation and very good linearity is seen.
【００２５】図８はｔ90（トルク）と電流−時間曲線か
ら求めたｔ90（電流）の相関性を示す図である。加硫温
度１４０〜１７０℃では直線関係が見られる。以上のよ
うに、トルクー時間曲線とｔａｎδ−時間曲線、電流−
時間曲線には極めて良い相関性がある。FIG. 8 is a diagram showing the correlation between t 90 (torque) and t 90 (current) obtained from the current-time curve. A linear relationship is seen at a vulcanization temperature of 140 to 170 ° C. As described above, the torque-time curve, tan δ-time curve, and current-
The time curves have a very good correlation.
【００２６】図９は本発明に係る成形装置の要部を示し
た一部断面図である。符号８０は射出成形装置（装置全
体の図は省略している）のスクリュウを示しており、そ
の先端部側には金型８１が配設されている。金型８１は
固定金型８２と可動金型８３から構成されている。FIG. 9 is a partial sectional view showing the main part of the molding apparatus according to the present invention. Reference numeral 80 denotes a screw of an injection molding device (the entire device is omitted in the drawing), and a die 81 is arranged on the tip end side thereof. The mold 81 is composed of a fixed mold 82 and a movable mold 83.
【００２７】金型８１（固定金型８２と可動金型８３）
には成形部８４の外に測定部８５が形成されている。成
形部８４と測定部８５は連通している。測定部８５に関
連した固定金型８２と可動金型８３には、それぞれ電極
８６，８７が設けてある。電極８６，８７は計測部８８
を介して制御部８９と電気的に接続されている。Mold 81 (fixed mold 82 and movable mold 83)
A measuring portion 85 is formed outside the molding portion 84. The molding unit 84 and the measuring unit 85 are in communication with each other. Electrodes 86 and 87 are provided on the fixed mold 82 and the movable mold 83, which are associated with the measuring unit 85, respectively. Electrodes 86 and 87 are measuring units 88
It is electrically connected to the control unit 89 via.
【００２８】[0028]
(1) 予めゴム配合物Ｒの誘電正接（ｔａｎδ）または電
流値の時間変化を測定しておき最適加硫条件を本装置で
設定する。制御部８９では最適加硫条件となる誘電正接
（ｔａｎδ）または電流値が測定されたら、加硫を停止
し金型８１を開くように制御条件を設定しておく。 (2) スクリュウ８０を作動させ、金型８１の成形部８４
にゴム配合物Ｒを充填する。成形部８４に充填されたゴ
ム配合物Ｒの一部は測定部８５に流れ込む。 (3) 金型８１中でゴム配合物Ｒを成形加硫しながら電極
８６，８７に交流電圧を印加し、測定部８５中のゴム配
合物の誘電正接（ｔａｎδ）または電流値を測定する。 (4) 測定値から予め設定された誘電正接（ｔａｎδ）ま
たは電流値が得られたら加硫を停止し金型８１を開か
れ、最適加硫が行なわれたゴム製品を得ることができ
る。 なお、本発明は上記発明の形態に限定されるものではな
く、特許請求の範囲の記載内において数々の変形が可能
である。(1) The dielectric tangent (tan δ) of the rubber compound R or the time change of the current value is measured in advance, and the optimum vulcanization condition is set by this apparatus. When the dielectric loss tangent (tan δ) or the current value which is the optimum vulcanization condition is measured, the control unit 89 sets the control condition such that the vulcanization is stopped and the mold 81 is opened. (2) The screw 80 is actuated, and the molding portion 84 of the die 81
Fill with rubber compound R. A part of the rubber compound R filled in the molding section 84 flows into the measuring section 85. (3) While molding and vulcanizing the rubber compound R in the mold 81, an AC voltage is applied to the electrodes 86 and 87 to measure the dielectric loss tangent (tan δ) or current value of the rubber compound in the measuring section 85. (4) When a preset dielectric loss tangent (tan δ) or current value is obtained from the measured value, the vulcanization is stopped and the mold 81 is opened to obtain the optimally vulcanized rubber product. It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.
【００２９】[0029]
【発明の効果】本発明は上記構成を有し、被加硫ゴムに
電圧を印加して誘電正接（ｔａｎδ）または電流値を測
定し、これによってゴムの加硫反応の進行をリアルタイ
ムで測定することができる。また、上記測定方法を利用
することによって加硫成形装置の自動制御が可能とな
り、ひいてはゴムの成型加工工程の自動化が可能とな
る。EFFECT OF THE INVENTION The present invention has the above-mentioned constitution, and a voltage is applied to a rubber to be vulcanized to measure a dielectric loss tangent (tan δ) or a current value, and thereby the progress of the vulcanization reaction of the rubber is measured in real time. be able to. Further, by utilizing the above-mentioned measuring method, the vulcanization molding apparatus can be automatically controlled, and the rubber molding process can be automated.
【図１】電極を装備した金型の説明図である。FIG. 1 is an explanatory view of a mold equipped with electrodes.
【図２】表１に示す配合のＮＢＲゴムを加硫し、加硫反
応の進行に伴うトルクの時間変化を示した図である。FIG. 2 is a diagram showing the change over time in torque with the progress of the vulcanization reaction after vulcanizing the NBR rubber having the composition shown in Table 1.
【図３】誘電正接（ｔａｎδ）−時間曲線を示す図であ
る。FIG. 3 is a diagram showing a dielectric loss tangent (tan δ) -time curve.
【図４】電流−加硫時間の変化を示す図である。FIG. 4 is a diagram showing changes in current-vulcanization time.
【図５】加硫反応の進行に伴う引っ張り強度の時間変化
を示した図である。FIG. 5 is a diagram showing a change over time in tensile strength with the progress of a vulcanization reaction.
【図６】硫黄と加硫剤を含まないゴム配合物の誘電正接
（ｔａｎδ）−時間曲線を示す図である。FIG. 6 is a graph showing a dielectric loss tangent (tan δ) -time curve of a rubber compound containing no sulfur and a vulcanizing agent.
【図７】９０％加硫時間ｔ90（トルク）と９０％加硫時
間ｔ90（ｔａｎδ）との相関性を示した図である。FIG. 7 is a diagram showing the correlation between 90% vulcanization time t 90 (torque) and 90% vulcanization time t 90 (tan δ).
【図８】９０％加硫時間ｔ90（トルク）と９０％加硫時
間ｔ90（電流）との相関性を示した図である。FIG. 8 is a diagram showing the correlation between 90% vulcanization time t 90 (torque) and 90% vulcanization time t 90 (current).
【図９】本発明に係る成形装置の要部を示した一部断面
図である。FIG. 9 is a partial cross-sectional view showing the main parts of the molding apparatus according to the present invention.
８１ 金型 ８２ 固定金型 ８３ 可動金型 ８５ 測定部 ８６，８７ 電極 81 mold 82 fixed mold 83 movable mold 85 measuring unit 86, 87 electrode
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｋ 21:00 105:24 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area // B29K 21:00 105: 24
Claims (4)
あって、 交流電圧を印加して加硫反応進行中のゴム配合物の誘電
正接（ｔａｎδ）または電流値を測定することを特徴と
する、 加硫反応の測定方法。1. A method for measuring the progress of a vulcanization reaction of rubber, which comprises applying an AC voltage to measure a dielectric loss tangent (tan δ) or a current value of a rubber compound during the progress of the vulcanization reaction. And the method of measuring the vulcanization reaction.
されることを特徴とする、請求項１記載の加硫反応の測
定方法。2. The method for measuring a vulcanization reaction according to claim 1, wherein an AC voltage is applied to the electrodes provided on the mold.
物の誘電正接（ｔａｎδ）または電流値を測定するステ
ップ、 予め設定した誘電正接（ｔａｎδ）または電流値が測定
されたときに成形加硫を停止するステップ、を含むこと
を特徴とする、 ゴム製品の製造方法。3. A method for manufacturing a rubber product, comprising the steps of filling a mold with a rubber compound and measuring the dielectric loss tangent (tan δ) or current value of the rubber compound while molding and vulcanizing. And a step of stopping the molding vulcanization when a tangent (tan δ) or an electric current value is measured.
であって、上記金型にゴム配合物の誘電正接（ｔａｎ
δ）または電流値を測定する電極が設けられていること
を特徴とする、 ゴム製品の製造装置。4. An apparatus for molding and vulcanizing a rubber compound with a mold, wherein the mold device has a dielectric loss tangent (tan) of the rubber compound.
An apparatus for manufacturing a rubber product, which is provided with an electrode for measuring δ) or an electric current value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7262265A JP2717641B2 (en) | 1995-09-13 | 1995-09-13 | Rubber product manufacturing method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7262265A JP2717641B2 (en) | 1995-09-13 | 1995-09-13 | Rubber product manufacturing method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0976251A true JPH0976251A (en) | 1997-03-25 |
| JP2717641B2 JP2717641B2 (en) | 1998-02-18 |
Family
ID=17373392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7262265A Expired - Lifetime JP2717641B2 (en) | 1995-09-13 | 1995-09-13 | Rubber product manufacturing method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2717641B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7433755B2 (en) | 2001-03-21 | 2008-10-07 | Signature Control Systems, Inc. | Controlling the curing of a rubber compound |
| WO2010074682A1 (en) * | 2008-12-22 | 2010-07-01 | Purdue Research Foundation | Polymeric structures and methods for producing and monitoring polymeric structures |
| JP2018044870A (en) * | 2016-09-15 | 2018-03-22 | Ｊｓｒトレーディング株式会社 | Electrical property measuring apparatus, rubber composition inspection method, and rubber product manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08285802A (en) * | 1995-04-13 | 1996-11-01 | Japan Atom Energy Res Inst | Measuring method of progress state of rubber cross-linking reaction by electric characteristic value |
-
1995
- 1995-09-13 JP JP7262265A patent/JP2717641B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08285802A (en) * | 1995-04-13 | 1996-11-01 | Japan Atom Energy Res Inst | Measuring method of progress state of rubber cross-linking reaction by electric characteristic value |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7433755B2 (en) | 2001-03-21 | 2008-10-07 | Signature Control Systems, Inc. | Controlling the curing of a rubber compound |
| US7977952B2 (en) | 2007-12-21 | 2011-07-12 | Gary Krutz | Polymeric structures and methods for producing and monitoring polymeric structures |
| WO2010074682A1 (en) * | 2008-12-22 | 2010-07-01 | Purdue Research Foundation | Polymeric structures and methods for producing and monitoring polymeric structures |
| JP2018044870A (en) * | 2016-09-15 | 2018-03-22 | Ｊｓｒトレーディング株式会社 | Electrical property measuring apparatus, rubber composition inspection method, and rubber product manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2717641B2 (en) | 1998-02-18 |
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