Effects of Zinc Stearate Replacement and Zinc Oxide/Zinc Stearate Ratio on Rheological Properties and Curing Characteristics of Carbon Black-Filled Rubbers

Document Type : Original Article

Author
Iran University of Science and Technology
Abstract
This work aims to study the substitution of zinc stearate (ZS) as an activator and coactivator with stearic acid (SA), its mechanism of action and also the influence of ZnO/ZS on the rheological and curing characteristics of styrene-butadiene (SBR), butadiene (BR) and nitrile-butadiene (NBR) rubbers-filled carbon black. Despite accelerating the curing reaction rate of SBR, BR and NBR by ~119, 145 and 22%, the ZS chemical increased the maximum torque in the oscillating disc rheometer (ODR) by 13 and 17% for BR and NBR, respectively, with a slight change for SBR. The minimum torque in the ODR test also increased by ~25 and 11% for BR and NBR in the presence of ZS, while SBR experienced a ~8% reduction. The decrease in the ZnO/ZS ratio changed the rheological behavior of SBR to an insignificant overcuring reversion in the maturing zone. The curing time of SBR was decreased from 15.09 to 11.31 min by reducing the ZnO/ZS amount from 2/1 to 1/1, while the scorch time was almost similar in the BR and NBR-based compounds. Reducing the ZnO/ZS amount raised the maximum vulcanization rate of SBR by ~50% (0.687 to 1.03 1/min), while its trend was descending in the BR and NBR compounds by ~53% and 20%. Moreover, the decrease of ZnO in the recipe containing the ZS chemical decreased the crosslinking by ∼16% (from 8.065 to 6.768×105 mol/g) and 4% (from 0.278 to 0.268×105 mol/g) for the BR and NBR compounds, while it did not vary the SBR crosslink density.
Keywords

Article Title Persian

اثرات جایگزینی استئارات روی و نسبت اکسید روی/استئارات روی بر خواص رئولوژیکی و پخت لاستیک های پر شده با دوده

Abstract Persian

این پژوهش به بررسی جایگزینی استئارات روی (ZS) به عنوان فعال‌کننده و هم‌فعال‌کننده با اسید استئاریک (SA)، و تأثیر ZnO/ZS بر ویژگی‌های رئولوژیکی و پخت لاستیک‌های استایرن-بوتادین (SBR)، بوتادین (BR) و نیتریل-بوتادین (NBR) پرشده با دوده می‌پردازد. با وجود اینکه ZS سرعت واکنش پخت SBR، BR و NBR را به ترتیب به میزان ~119، 145 و 22 درصد افزایش داد، افزایش ZS حداکثر گشتاور را در رئومتر نوسانی (ODR) به ترتیب 13 و 17 درصد برای BR و NBR افزایش داد، در حالی که تغییر کمی برای SBR مشاهده شد. حداقل گشتاور در آزمون ODR نیز به ترتیب ~25 و 11 درصد برای BR و NBR در حضور ZS افزایش یافت، در حالی که SBR کاهش 8 درصدی را تجربه کرد. کاهش نسبت ZnO/ZS رفتار رئولوژیکی SBR را به یک بازگشت بعد از پخت تغییر داد. زمان پخت SBR از 15.09 به 11.31 دقیقه با کاهش مقدار ZnO/ZS از 2/1 به 1/1 کاهش یافت، در حالی که زمان اسکورچ تقریباً مشابهی در ترکیبات مبتنی بر BR و NBR مشاهده شد. کاهش مقدار ZnO/ZS حداکثر نرخ ولکانیزاسیون SBR را به میزان ~50 درصد (از 0.687 به 1.03 1/min) افزایش داد، در حالی که روند آن در ترکیبات BR و NBR به ترتیب ~53 و 20 درصد کاهش یافت. علاوه بر این، کاهش ZnO در فرمولاسیون حاوی ZS شیمیایی، پیوندزنی را به میزان ∼16 درصد (از 8.065 به 6.768×105 مول/گرم) و 4 درصد (از 0.278 به 0.268×105 مول/گرم) برای BR و NBR کاهش داد، در حالی که چگالی پیوندزنی SBR تغییر نکرد.

Keywords Persian

کامپاند لاستیک
پخت
اکسید رویف استئارات روی
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