水滑石在氟橡胶中的应用研究

讨论了以水滑石替代氢氧化钙作为碱催化剂的硫化特性,研究了水滑石/氧化钙组合对消除氟橡胶硫化试样气泡的作用。研究了水滑石对双酚硫化氟橡胶的耐水性能的影响。     

对苯乙烯磺酸钠修饰水滑石/顺丁橡胶复合材料的制备与性能研究

利用共沉淀法合成了硝酸根型水滑石(NO3-HT),将其与对苯乙烯磺酸钠(SSS)进行离子交换,制备对苯乙烯磺酸钠修饰的水滑石(SSS-HT)。用红外光谱(IR)、X-射线衍射(XRD)、热重分析(TGA)对水滑石的结构和性能进行了表征。结果表明,经对苯乙烯磺酸钠修饰后的水滑石层间距由硝酸根型水滑石的0.8 nm扩大到了1.88 nm,对苯乙烯磺酸钠型水滑石的热稳定性有所提高。将其与顺丁橡胶(BR)混炼,制备水滑石/橡胶复合材料。用红外光谱、硫化仪、力学性能测试仪与热重分析仪对其结构与性能进行了研究。实验结果表明,随着水滑石含量的增加,BR/水滑石复合材料的焦烧时间和正硫化时间逐渐缩短且经过有机修饰的水滑石变化幅度更大,同时在保持复合材料的热稳定性的基础上,加入经过有机修饰后的水滑石对复合材料的力学性能有着显著的提高。     

对苯乙烯磺酸钠修饰水滑石/丁腈橡胶复合材料的制备与性能研究

利用共沉淀法合成了硝酸根型水滑石(NO3-HT),将其与对苯乙烯磺酸钠(SSS)进行离子交换,制备对苯乙烯磺酸钠修饰的水滑石(SSS-HT)。用红外光谱(IR)、X-射线衍射(XRD)、热重分析(TGA)对水滑石的结构和性能进行了表征。结果表明,经对苯乙烯磺酸钠修饰后的水滑石层间距由硝酸根型水滑石的0.8 nm扩大到了1.88 nm,对苯乙烯磺酸钠型水滑石的热稳定性有所提高。将其与丁腈橡胶(NBR)混炼,制备水滑石/橡胶复合材料。用红外光谱、硫化仪及热重分析对其结构与性能进行了研究。实验结果表明,随着水滑石含量的增加,NBR/水滑石复合材料的焦烧时间和正硫化时间逐渐缩短且经过有机修饰的水滑石变化幅度更大,同时水滑石的加入也提高了橡胶的热稳定性。     

对苯乙烯磺酸钠修饰水滑石／丁苯橡胶复合材料的制备与性能研究

利用共沉淀法合成了硝酸根型水滑石（NO3-HT）,将其与对苯乙烯磺酸钠（SSS）进行离子交换,制备对苯乙烯磺酸钠修饰的水滑石（SSS—HT）。用红外光谱（IR）、X-射线衍射（XRD）、热重分析（TGA）对水滑石的结构和性能进行了表征。结果表明,经对苯乙烯磺酸钠修饰后的水滑石层间距由硝酸根型水滑石的0．8nm扩大到了1．88nm．对苯乙烯磺酸钠型水滑石的热稳定性有所提高。将其与丁苯橡胶（SBR）混炼。制备水滑石／橡胶复合材料。用红外光谱、硫化仪、力学性能测试仪及热重分析对其结构与性能进行了研究。实验结果表明,随着水滑石含量的增加,SBR／水滑石复合材料的焦烧时间和正硫化时间逐渐缩短且经过有机修饰的水滑石变化幅度更大,同时水滑石的加入也提高了橡胶的热稳定性和力学性能。     

溴化锂含量影响X射线荧光光谱法测定滑石主、次元素的研究

采用波长色散型X射线荧光光谱法中熔融玻片法测定滑石中的主、次元素含量,在制备熔融玻片样品时,选择10 mg无污染、脱模效率高的溴化锂做脱模剂,在取得好的脱模效果的同时使测试的元素氧化物含量结果更准确。     

RM-1型脱模剂在外胎硫化中的应用

ＲＭ１型脱模剂在外胎硫化中的应用王振太刘震曹培江（青岛第二橡胶厂２６６０４１）在硫化罐硫化外胎过程中，为了方便外胎脱模，防止弯钢丝等质量缺陷，通常要在模型钢圈或胎坯胎圈上涂刷一层脱模剂。早期使用的脱模剂一般为肥皂液，由于肥皂液脱模效果不理想，逐渐被...     

水滑石的表面改性研究

采用阴离子表面活性剂硬脂酸钠对水滑石进行表面改性,研究了温度、时间和改性剂用量等各种因素对水滑石改性效果的影响。并用红外和X衍射等仪器对改性前后的水滑石进行了表征。用活化指数表征的水滑石的表面处理效果非常理想,为新型阻燃剂水滑石在工业方面的应用奠定了良好的基础。     

一种用于橡胶的插层水滑石抗紫外老化剂及其制备方法和使用方法

<正>授权公告号:CN 107022115B授权公告日:2019年8月13日专利权人:北京化工大学发明人:林彦军、吴勤、李凯涛本发明公开了一种用于橡胶的插层水滑石抗紫外老化剂及其制备方法和使用方法。插层水滑石利用层间客体分子可交换的特性,将交联剂引入水滑石层间,使其与橡胶分子链之间产生连锁反应生成交联键,增强硫化胶的耐紫外老化     

壳聚糖增强BR/EPDM共混物初探

制备了壳聚糖填充的BR/EPDM共混胶,研究了壳聚糖对胶料硫化特性、力学性能、脱模性能及相形态的影响。结果表明,壳聚糖能协同过氧化物促进橡胶的硫化,随着壳聚糖用量的增加,硫化速度指数增大,当壳聚糖用量为10份时,在175℃,3min出现返原现象,硫化速度指数较未添加时提高了53%。添加壳聚糖较大程度影响了硫化胶的力学性能;随着壳聚糖用量的增加,硫化胶的撕裂强度直线增大,用量为5份时,撕裂强度达到19.60kN/m,较未添加时提高了近1倍;随着壳聚糖用量的进一步增大,撕裂强度存在波动性回落,但最低值达到9.57kN/m,较未添加时提高了近5kN/m。壳聚糖对硫化胶热态下脱模性能有较大影响,用量为5份时,脱模效果最好。     

磁性类水滑石的制备和吸附水中磷的研究

采用共沉淀制备一系列磁性Mg-Al、Zn-Al、Mg-Fe和Zn-Fe类水滑石磷吸附剂,并研究了磁性类水滑石的组成、摩尔比、pH值、吸附剂用量等对含磷酸盐废水的吸附性能影响。结果表明,磁性类水滑石对磷酸根有良好的吸附效果,磁性类水滑石的金属组成对磷酸根吸附有显著影响,其中Mg/Al摩尔比为2∶1的磁性类水滑石在pH=5～7范围内吸附效果最好,吸附剂最佳投加量0.5 g,最高吸附量达47.1 mg/g。     

水滑石填充无卤阻燃三元乙丙橡胶

本实验研究了新型无卤阻燃剂水滑石以及复配阻燃剂微胶囊红磷填充在无卤阻燃三元乙丙橡胶中,对橡胶阻燃性能及力学性能的影响;并研究了运用不同硅烷偶联剂对水滑石进行表面处理对橡胶性能的影响。结果表明,水滑石的填充能有效提高橡胶阻燃性能,且微胶囊红磷对水滑石有很好的协助阻燃效应。经γ-（甲基丙烯酰氧）丙基三甲氧基硅烷表面处理,橡胶阻燃性及力学性能均有一定提高。     

New hydroxyapatite–hydrotalcite composites I. synthesis

The synthesis and characterization of original materials, composed by hydrotalcite and hydroxyapatite, is discussed. All the syntheses were carried out in presence of microwave irradiation during the crystallization step. The interactions between the two compounds depend on the synthesis procedure. If hydroxyapatite is incorporated to hydrotalcite, the first compound is encapsulated by hydrotalcite. Instead, if hydroxyapatite is first prepared, the resulting solid is essentially a hydrotalcite with interlayered hydroxyapatite. When the composite material is synthesized by a simultaneous coprecipitation, the small clusters of hydroxyapatite and hydrotalcite are homogeneously dispersed. Consequently, the specific surface area and the particle size vary.     

含钇钡铜的新型类水滑石的合成与性能研究

采用共沉淀法,合成含钇钡铜的新型的类水滑石,并利用XRD、FT—IR、TG及SEM对其结构与特性进行表征。研究结果表明,该类水滑石（YBa2Cu3-LDHs）具有水滑石的特征层状结构;热分析结果显示,该类水滑石比Mg6Al2-LDHs具有更高的热稳定性,有望作为一类新型的功能材料而获得应用。     

有转子硫化仪滞后现象的分析

分析了有转子硫化仪测试胶料硫化特性时出现的第1次试验时间滞后现象。实验分析和传热分析计算得出,硫化仪模胶充满空气时的转子表面温度比充满胶料时低,从而导致硫化仪第1次试验胶料的硫化速度慢,表面为胶料硫化特征时间(ts1,t10,t50和t90等）滞后。在试验前延长硫化仪模腔保温时间可缩短第1次试验的滞后时间。     

Fluoride Removal from Aqueous Solutions by Magnesium,Nickel, and Cobalt Calcined Hydrotalcite‐like Compounds

Abstract

Magnesium, nickel and cobalt hydrotalcite‐like compounds (MgHT, NiHT, and CoHT), with similar M²⁺:Al³⁺ ratios were synthesized and characterized by XRD. It was confirmed from XRD that the materials have hydrotalcite‐like structure. MgHT, NiHT, and CoHT were calcined and treated with fluoride solutions in a batch system. F^? ions were determined in the remaining solutions using a fluoride ion selective electrode. The kinetics of the fluoride ions sorption on calcined hydrotalcite‐like compounds (CHT) was best described by the pseudo‐second order model and the equilibrium was reached in less than 300 minutes in all cases (MgCHT, NiCHT, and CoCHT). The sorption isotherms of the fluoride by hydrotalcite like compounds can be explained by the Langmuir‐Freundlich model and, the highest fluoride sorption capacity was obtained for NiCHT (1.202 mgF/gCHT). The fluoride removal from aqueous solutions by calcined hydrotalcite‐like compounds depends on the adsorption properties of the thermal decomposition products and the regeneration reaction mechanism of the hydrotalcite‐like compounds.     

橡胶模具发展概观

首先概述了橡胶模具的分类和基本概况，分析了橡胶模具的独有特点。随后分析了橡胶模具的加工技术、选用材质、表面处理、模具污染及模具清洗等情况。着重介绍了橡胶模具的材质及清洗方式的选择和使用状况。最后总结了橡胶模具发展应注意的一些问题。     

New hydroxyapatite–hydrotalcite composites II. microwave irradiation effect on structure and texture

Acid-basic materials are often used to catalyse organic reactions. Hydroxyapatite is acidic and hydrotalcite presents basic properties. The association of both compounds in a single material should present a rather unique catalytic behavior. Three preparations of hydroxyapatite impregnated with hydrotalcite are presented. The effect of microwave irradiation, at different preparation levels, is discussed. A homogeneous distribution of hydrotalcite on hydroxyapatite surface is obtained when hydrotalcite is precipitated over a previously microwave irradiated hydroxyapatite. Instead, if the hydrotalcite mixture is incorporated to the hydroxyapatite precursor gel and the resulting mixture microwave irradiated, hydrotalcite is preferentially deposited in the hydroxyapatite interparticle spaces. When both hydroxyapatite and hydrotalcite solutions are irradiated, mixed and irradiated again, the composite behaves as the addition of the two components.     

橡胶硫化模具的化学清洗

介绍了橡胶硫化模具的各种化学清洗方法．其中胶料清洗法无需任何附加设备,劳动强度低,并且不损伤模具．     

Hot embossing of discrete microparts

The hot embossing process has so far been developed mainly for replication of surface structures on thermoplastic substrates. Because of the lack of a through‐thickness action, fabrication of discrete microparts such as microgears is considered difficult. In this study, embossing molds having multiple microcavities were used in a through‐thickness embossing process with a rubber‐assisted ejection mechanism. Microparts made of HDPE and ABS with each part weighing approximately 1 and 1.4 mg, respectively, were produced. When in the mold, embossed microparts were intermittently connected to each other through thin residual films of a thickness approximately 20 μm. The residual films were detached from the microparts during a rubber‐assisted ejection stage. Because no resin delivery paths, e.g., runners and gates, are needed for microcavities on the multicavity embossing mold, this micropart fabrication process could replace micro injection molding in many applications. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers     

短切碳纤维对天然橡胶/顺丁橡胶复合材料性能的影响

以天然橡胶(NR)和顺丁橡胶(BR)为基料,以短切碳纤维(SCF)为添加剂,制备了SCF/NR/BR复合材料,考察了SCF用量对NR/BR的摩擦性能及力学性能的影响。结果表明,SCF可增强NR/BR基体的强度,增大其硬度。在NR/BR混合胶中加入15份SCF可以降低混合胶的摩擦系数,减少混合胶的磨损量,提高混合胶的耐磨性能。SCF增强的NR/BR在摩擦过程中发生了磨粒磨损和黏着磨损,形成了卷曲磨屑。