双相填充配方的不同注油温度混炼技术研究

研究啮合型密炼机混炼双相填充配方不同注油温度的混炼技术。结果表明:采用高温注油混炼工艺混炼的双相填充基部胶对降低胶料生热及改善分散性能均有明显优势;使用新混炼技术混炼的基部胶物理性能改善明显,成品轮胎的耐久性能得到进一步优化,滚动阻力降低。     

啮合型和剪切型密炼机混炼效果的对比实验研究

本文对啮合型和剪切型密炼机混炼含有氯丁胶配方的效果进行了比较分析,重点分析了填充系数变化对2种密炼机混炼工艺和混炼胶性能的影响。结果表明,啮合型密炼机具有良好的散热性能,更适合于氯丁胶配方的混炼;同时填充系数对啮合型密炼机的混炼工艺影响较大,而对剪切型密炼机影响较小,特别是在对混炼胶质量的影响上啮合型密炼机尤为明显。     

啮合型和剪切型密炼机混炼效果的对比试验研究

本文对啮合型和剪切型密炼机混炼含有氯丁胶配方的效果进行了比较分析,重点分析了填充系数变化对2种密炼机混炼工艺和混炼胶性能的影响.结果表明,啮合型密炼机具有良好的散热性能,更适合于氯丁胶配方的混炼;同时填充系数对啮合型密炼机的混炼工艺影响较大,而对剪切型密炼机影响较小,特别是在对混炼胶质量的影响上啮合型密炼机尤为明显.     

用于混炼白炭黑填充胶料的啮合式密炼机的最新混炼技术

本文论述了混炼参数对白炭黑填充胶料性能的影响,并对那些能够改善硅烷化反应效率的因素和装备有现代化啮合式转子的密炼机的混炼性能进行了论述。对这种最新型的啮合式转子对白炭黑填充胶料混炼反应的功效进行了研究。     

橡胶混炼技术的新发展方向

作为橡胶混炼设备,混炼机在橡胶工业和轮胎工业占主导地位已经一个多世纪。切向式转子和啮合式转子是密炼机的两个基本设计。近十年来,为了解决地球环境问题,已经开发出白炭黑／硅烷补强轮胎胎面胶之类的新材料和新配方。为了提高胶料性能,必须优化各种填充剂在密炼机中密炼的分布和分散。特别是在混炼中的温度控制对控制配合剂的反应和减少在生产中的补充混炼步骤显得越来越重要。因此,为了获得所需的胶料性能。啮合式转子密炼机引人注目。本文对有关啮合式转子密炼机与切向式转子密炼机之间的对比所做的各种研究进行了介绍。啮合式转子密炼机的主要优点是它们较高的冷却和混炼效率。因此,为了提高混炼性能。已经研制出具有现代化转子的啮合式转子密炼机。     

密炼机填充因数对混炼胶性能的影响

研究在四棱异步转子密炼机压砣压力、转子转速和冷却水温度不变的条件下,密炼机填充因数对天然橡胶(NR)和丁苯橡胶(SBR)两种配方混炼胶性能的影响。结果表明:填充因数与最大功率消耗为正线性关系,与炭黑分散度和硫化胶物理性能为非线性关系,在混炼过程中填充因数存在一个可使混炼效果较好的最佳值,对于NR和SBR配方,填充因数取0.70～0.75较佳;利用试验数据求出的回归方程预测准确率比较高,可以用于预测和分析密炼机混炼过程中胶料质量。     

用混炼功率曲线控制混炼胶质量

介绍混炼功率曲线在控制和改善混炼胶质量方面的应用。混炼功率曲线可以用来查看密炼机功率消耗、了解橡胶混炼过程,除可显示混炼各阶段的进展情况外,还能在一定程度上表征混炼胶料各组分的分散效果。通过分析功率曲线,在改进加油点、密炼机填充因数和排胶时间后,使混炼周期缩短,能源消耗降低。     

低生热高导热轮胎橡胶复合材料的工程化研究

对低生热、高导热轮胎橡胶复合材料进行工程化研究。进行小型密炼机混炼试验,与开炼机混炼胶及企业提供的参比胶相比,材料性能达到了制备轮胎要求;采用低温一次法炼胶技术进行规模化生产,制备的碳纳米管/纳米氧化铝并用填充的导热胶在保证较低生热的情况下导热性能明显提高;将导热胶应用于工程机械子午线轮胎基部胶,轮胎的耐久性能优异。     

啮合式转子密炼机中转子的模拟和设计

对聚合物在啮合式转子密炼机中的流动进行了模拟分析,并分析了4种不同类型啮合式转子的混炼作用,还将模拟分析结果与分离式转子密炼机的实验结果进行了比较,结果表明,啮合式转子密炼机的填充因数比分离式转子密炼机大。     

使用串联密炼机一次法低温混炼工艺生产PCR胎面胶

白炭黑是实现绿色轮胎生产的关键材料,而传统炼胶方式对于高填充白炭黑的胶料混炼是非常困难的。为更好地解决白炭黑混炼的工艺难题,采用串联式密炼机一次法低温混炼工艺。研究得出,串联式密炼机与传统的密炼机混炼工艺相比具有更为优异的炼胶性能,胶料混炼能耗降低,生产效率提高,胶料质量更加稳定。     

白炭黑补强胶料的开炼机混炼工艺研究（Ⅱ）——溶聚丁苯橡胶

试验设计一种白炭黑补强溶聚丁苯橡胶的开炼机混炼工艺。相对于传统三段混炼工艺中的二段在高温开炼机上进行,将一段胶的热处理（硅烷化反应）放在老化箱中进行,重点考察热处理时间对胶料性能的影响。结果表明,该混炼工艺安全易行,二段热处理温度和时间控制精准,避免了高温混炼对胶料的剪切破坏,所得胶料的性能与密炼机混炼效果相当。     

白炭黑补强胶料的开炼机混炼工艺研究（Ⅰ）——天然橡胶

试验设计一种白炭黑补强天然橡胶的开炼机混炼工艺.相对于传统三段混炼工艺中的二段在高温开炼机上进行,将一段胶的热处理（硅烷化反应）放在老化箱中进行,重点考察热处理时间对胶料性能的影响.结果表明,该混炼工艺安全易行,二段热处理温度和时间控制精准,避免了高温混炼对胶料的剪切破坏,所得胶料的性能与密炼机混炼效果相当.     

聚丙烯汽车保险杠专用料的研制

采用配比合适的均聚和共聚ＰＰ为基础树脂,以ＥＰＤＭ为增韧剂,自制无机填充料Ａ为填料制得性能符合要求的保险杠料。研究了工艺路线、ＥＰＤＭ添加量和填料对物料性能的影响,结果表明,采用密炼机双螺杆工艺制得的物料性能比采用双螺杆二次法和单螺杆二次法的要好,ＥＰＤＭ能增加料的冲击强度,填料Ａ能提高模量,并对流动性影响较小。     

纳米氧化锌在BR胶料中分散性的研究

研究不同的加工温度、混炼设备、加工工艺对纳米氧化锌在BR胶料中分散性的影响。结果表明，提高混炼温度，采用密炼机混炼，对提高分散性有利；混炼前先将纳米氧化锌和硬脂酸混合的加料方法，可以有效地改善纳米氧化锌在胶料中的结团现象，大大提高其分散性。     

Processing window in impact-modified rigid PVC

A method is described for quickly evaluating the processing window of impact-modified rigid PVC formulations. This involves mixing the compound in a bowl mixer at various temperatures and to various levels of total work input. The impact properties are measured and plotted as a contour map versus melt temperature and work input. The melt temperature is the dominant factor in controlling the impact processing window. The total work input is a secondary effect, which mainly influences the system through shear heating effects on the melt temperature. This method was used to evaluate formulations with different impact modifiers and lubricant and filler levels. Impact modifier type, polyethylene wax, and filler concentrations are the dominant factors. The mechanisms involved are discussed.     

强化密炼机下辅机的剪切分散和混炼作用

通过比较强化下辅机与现有密炼机的混炼技术,论述现有密炼机生产线混炼技术的优缺点,提出在现有混炼技术基础上,采用新型开炼机来强化密炼机下辅机的剪切分散和混炼作用,使胶料混炼过程能够一次性完成,并起到提高胶料质量及节约能量和作业场地面积等作用。     

彩色填充PP油箱护罩料的研制

选用滑石粉、碳酸钙、硫酸钡、高岭土、硅灰石五种矿物填料,对比本色填充聚丙烯(PP)预混料经高速混合机混合前后的颜色变化,再经挤出造粒制得黄色填充PP材料,对比测试熔体流动速率(MFR)、力学性能、颜色、表面光泽度及热稳定性。结果表明,经高速混合机混合10 min后,填料为滑石粉、碳酸钙、硫酸钡时预混料颜色基本与混合前保持一致,填料为高岭土、硅灰石时预混料颜色明显变深、变黑;填料为硫酸钡时材料的熔体流动性能及综合力学性能更符合通用机械油箱护罩用填充PP材料的技术指标要求,MFR为37 g/10 min,拉伸强度为23.6 MPa,悬臂梁无缺口和缺口冲击强度分别为81.4 k J/m~2和9.7 k J/m~2,热变形温度为109℃;填料为碳酸钙、硫酸钡时材料颜色鲜艳,与标准色板颜色最为接近;填料为硫酸钡时具有最好的表面光泽度;滑石粉、碳酸钙、硫酸钡三者比较,当填料为硫酸钡时填充PP材料的热稳定性略好。研制的黄色填充PP材料已应用于通用机械油箱护罩。     

VIC型密炼机用于白炭黑胶料混炼工艺的探讨

温度控制法是目前密炼机排料控制中最常用的方法之一。排料温度不仅影响到混炼胶的性能,而且还影响到产品的使用寿命,特别是对热敏性橡胶和含有白炭黑等特殊材料要求的混炼就更为重要。VIC密炼机具有优良冷却效果和混炼温度可控的优点,本文应用VIC275密炼机对含有白炭黑的胶料进行了混炼实验,实验结果表明其混炼胶性能有了大幅度的提高。     

Effect of adding different silane coupling agents on metal friction and wear in mixing process

The function of silane coupling agent in rubber mixing field is to combine inorganic matrix with rubber organic matrix. Silica is commonly used in the rubber mixing field to strengthen rubber. The size and amount of silica aggregates in the mixing process are important factors affecting the wear of the mixing chamber. The wear of the mixing chamber would lead to a increasing gap between the mixer chamber and the rotor, which caused the mixing efficiency reducing. It also affected the dispersion effect, then affected the mechanical and physical properties of the vulcanized rubber. In this paper, the effects of rubber compound on metal friction and wear were studied by using four silane coupling agents commonly used in rubber mixing field. The experiment was carried out at 15°C, and the attention should be paid to drying during sample preparation to avoid the deviation of the experiment caused by hydrolysis of silane coupling agent. The results showed that silanization reaction occured between silica and silane coupling agent in the mixing process. The mixing temperature was usually maintained at 145 to 155°C for 1 min in the mixer, and the silanization reaction rate was the fastest during this time. We took this rubber compound as the research object and studied the friction and wear of the rubber compound on the mixing chamber in the mixing process. The products of the silylation reaction are alcohol and water. This paper studies the corrosion and abrasion of the mixing chamber by water at high temperatures. In the mixing process, abrasive wear was the main wear form, but the corrosion wear caused by high temperature steam still occupied a large proportion.     

A comparison of the effects of traditional and wet mixing processes of rubber on metal friction and wear

Prolonged operations of mixers cause wear of mixer rotors and chamber walls and affect the clearances between the rotors and chamber walls, which reduce the mixing effect, weaken the dispersion of the packing, and affect the quality of rubber products. In this study, the effects of traditional mixing and wet mixing on the friction and wear of the chamber, and the properties of rubber were compared by using 60 phr of a silica natural rubber formulation system. The results show that a silanization reaction occurs between silica and the silane coupling agent during the mixing process and that the reaction rate is fastest when the temperature of the mixing chamber is maintained between 145 and 155°C for 1 min during the mixing process. The products of silanization reaction are ethanol and water; the water vapor that forms at high temperatures corrodes the mixing chamber of the internal mixer and aggravates wear and tear. Due to the high dispersion of silica during wet mixing, the silanization reaction is more complete and water vapor is produced at a high temperature. Hence, the rubber compound obtained by wet mixing has more significant wear on the mixing chamber.