Insoluble sulfur predispersed rubber masterbatch and preparation method thereof
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A pre-dispersion and sulfur technology, applied in the field of insoluble sulfur pre-dispersion rubber masterbatch and its preparation, can solve the problems of poor compatibility, energy loss, difficult-to-disperse rubber, etc., achieve simple production process, improve product quality, and improve the operating environment Effect
Active Publication Date: 2016-04-06
朝阳明宇化工有限公司
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[0002] Traditional rubber additives are mostly powdery chemicals. Although they can bring great benefits to rubber products and their processing, they also have many shortcomings: First, the compatibility of powdery additives with rubber is better than that of pre-dispersed The masterbatch of rubber additives is poor, and it is more difficult to disperse evenly in the rubber than the rubber masterbatch products. Therefore, the quality of rubber products using powdered additives will be lower than that of rubber products using rubber masterbatch products; second, it will cause more energy loss
This technology improves the existing crushing process, adjusts the feeding speed and the rotating speed of the classifying wheel, so that the dispersibility of the prepared IS powder is improved, but the IS pre-dispersion aid is still powder
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Embodiment 1
[0028] Embodiment 1 (making container batching with 270L capacity)
[0029] (1) Plasticize 35kg of EPDM with a Mooney viscosity of 67, and 13.2kg of styrene-butadiene rubber (SBR) with a Mooney viscosity of 67. In order to keep the masterbatch in a good shape during plastication, Add 9.6kg of ethylene-vinyl acetate copolymer (EVA) and 1.8kg of white oil dispersant, and masticate in a plastic mixer at a temperature of 95-105°C for 15-16 minutes;
[0030] (2) When the Mooney viscosity of the masticated rubber drops to about 25 and the surface temperature of the tested masticated rubber is 18-20°C, add 158kg of insoluble sulfur IS7020, 40kg of naphthenic oil, and control the temperature at 58-63°C to continue masticating 15~20min;
[0031] (3) On the plasticizer, the operation time is 6 times on the left and right sides, the operation time is 3 to 4 minutes, and the rolling time is 6 times. Total sulfur, in which insoluble sulfur content ≥ 60% (in CS 2 Medium insolubles) and ≤...
[0040] Processing condition and preparation method are with embodiment 1.
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Abstract
The invention discloses an insoluble sulfur pre-dispersed rubber masterbatch and a preparation method thereof. The preparation method comprises the following steps of: adding EVA (Ethylene-Vinyl Acetate) and a dispersing agent to a insoluble sulfur masterbatch composite formed by taking an ethylene-propylene diene copolymer and styrene butadiene rubber as colloids, and plasticating at 95-105 DEG C for 15-16 minutes; when the mooney viscosity reaches 23-26 and the surface temperature of plasticated rubber is 18-20 DEG C, adding insoluble sulfur IS7020 and naphthenic oil, and controlling the temperature at 59-63 DEG C; respectively knifing left and right for 4-6 times and 3-4 minutes every time, rolling for 4-6 times and the total time of 1-2 minutes, and tabletting and granulating to prepare the insoluble sulfur IS60-75 rubber masterbatch. Compared with the traditional product technology, the insoluble sulfur pre-dispersed rubber masterbatch disclosed by the invention has the advantage that raw materials of 38 micrometers are all sieved, is not adhered at room temperature without dust flying, can ensure the activity of IS by being pre-dispersed by using a rubber carrier, has very good compatibility with different rubbers, still has lower viscosity and low shearing rate at lower mixing temperature and is easy to disperse and automatically metered. According to the invention, the mixing speed is accelerated, and good dispersion and distribution can be realized within a short time.
Description
technical field [0001] The invention relates to an insoluble sulfur pre-dispersed rubber masterbatch and a preparation method thereof, in particular to a product and a method in which the insoluble sulfur pre-dispersed rubber additive masterbatch replaces the traditional insoluble sulfur powder rubber additive. Background technique [0002] Traditional rubber additives are mostly powdery chemicals. Although they can bring great benefits to rubber products and their processing, they also have many shortcomings: First, the compatibility of powdery additives with rubber is better than that of pre-dispersed The masterbatch of rubber additives is poor, and it is more difficult to disperse evenly in the rubber than the rubber masterbatch products. Therefore, the quality of rubber products using powdered additives will be lower than that of rubber products using rubber masterbatch products; second, it will cause More energy loss. When using powdered rubber additives, in order to d...
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