翻修轮胎适模加减法

利用好现有硫化内模，避免采用增加胎面胶来适应内模，是减少耗胶和提高胎合格率的重要一环。根据未硫化翻修胎与内模配合的超差，往往要在上模与下模之间，在轮胎的不同部位与内模之间，放置垫片，以期使未硫化轮胎与内膜之间达到理想配合。这种方法称之为“放垫加减法”。     

研发和掌控轮胎翻修的关键技术

轮胎翻修是轮胎资源循环利用的首选。欲推进轮胎循环利用,就要着重提高翻胎质量和翻新次数。这就要求要研发和掌控好轮胎翻新的关键技术：怎样提高新旧胶的粘接强度和胎面胶的耐磨性？如翻修胎所用新胶与旧胎体胶粘结牢实,不翘边、跨皮、脱落;胎面胶耐磨、使用寿命长,肯定受到用户青睐、社会好评,用户也乐于使用;注意爱胎、节胎、保护胎体、及时送翻,千方百计提高翻新率并争取多次翻新,以降低轮胎使用成本,这自然就更有利于促进轮胎的循环利用。     

轮胎翻修工艺及主要设备

一、轮胎翻修主要工艺 轮胎翻修有常用的两种工艺：模硫化法翻新工艺（俗称传统法或热翻）,预硫化胎面法翻新工艺（俗称冷翻）。     

浙江轮胎翻修厂子午线轮胎翻新的新突破

浙江轮胎翻修厂子午线轮胎翻新的新突破浙江轮胎翻修厂为提高翻胎的行驶里程，在胎面胶中掺用了一定比例的活化胶粉，这不仅较大幅度地提高了胎面的耐磨性能，而且可降低生产成本５％，全年可降低成本５万多元。该厂还选用了新工艺，用钢丝粘合胶浆及钢丝粘合胶加强钢丝与...     

提高大型轮胎翻修质量的方法

在翻修轮胎用的隔离胶和胶浆中加入改性剂，可以提高新、旧胎面之间的粘接强度，提高翻新轮胎的质量。     

我国航空轮胎翻修的发展过程与展望

我国于1985年开始翻修民航机的轮胎,但至今没有对军用飞机轮胎进行翻修,造成资源浪费。通过分析,认为我国翻胎技术成熟,可以进行军用飞机轮胎的翻修,不但可以节约军费开资,同时也与国防安全息息相关。     

高温硫化无后充气聚酯轿车子午线轮胎的研制

高温无后充气硫化需采用尺寸稳定型聚酯帘线作轮胎补强材料，硫化介质用饱和蒸汽代替过热水，当１８０℃×３０ｍｉｎ热收缩率为２％以内时，其成型施工机头宽度在人造丝基础上增加４—６ｍｍ。为防止胶料返原，合成橡胶用量由１５％—４０％增加到３０％—６０％。室内外试验结果表明，高温无后充气硫化轮胎外缘尺寸虽然膨胀率大于人造丝胎体，但完全可满足设计要求，且实际应用时断面膨大率仅为０６％—０７％。高温强制硫化工艺在不增加设备投资和生产费用的情况下，可提高生产效率２倍以上     

充气轮胎配方设计 第4讲 轮胎硫化体系设计

充气轮胎配方设计第４讲轮胎硫化体系设计李暖（北京橡胶工业研究设计院１０００３９）目前，我国轮胎硫化工艺条件随轮胎品种、规格的不同而异。通常大型工程机械轮胎采用低温长时间硫化，或采用阶梯升温硫化条件；轿车和轻型载重车轮胎硫化温度为１７０℃左右，如上海正...     

重庆超科实业公司轮胎翻修成绩显著

重庆超科实业公司轮胎翻修成绩显著     

化工装置不停产条件下技改工程的施工

化工生产装置,因其生产工艺复杂、自动化程度高、生产连续性强等特点,生产装置内的技改施工一般应在停工状态下,针对装置的具体特点,也可采用不停车状态下进行技改工程.本文以醋酸装置为例,重点介绍了化工技改工程在装置不停产条件下的施工部署和安全管理.     

化工生态工业园区设计理论及方法研究

基于生态化化工工业园区的规划和建设,提出了全面"绿化"的理念,即对化工生态工业园区工业系统构建生态产业链(内部绿化)及园区环境景观布局(外部绿化)的规划设计.工业系统方面,针对典型的4个化工门类,分别给出了子系统产业链的构建模型;景观布局方面,创新性地提出了区带式与组团式结合的分区模式.最后把生态学理论和相应的化工园区典型特征结合,总结出规划化工生态工业园区总体步骤流程.     

橡胶的物理与化学改性

该文综述了近十年来橡胶的物理改性与化学改性的状况。     

Physical and chemical stress relaxation of elastomers

In this paper we have developed a method whereby physical and chemical relaxation processes can be distinguished, using stress relaxation experiments as a function of temperature. We assumed that there exists some temperature range above the glass transition temperature over which the chemical effects can be neglected for the time scale of the experiments. The data in this low temperature range were then used to determine the WLF constants and other physical relaxation parameters. The physical component of the stress relaxation could then be subtracted from high temperature experiments in order to extract chemical kinetic information. Based on certain reasonable assumptions, an equation was developed for the relaxation modulus of a chemically reacting system. This equation could be used to determine the time dependence of the crosslink density, or conversely could be used to predict the long term relaxation modulus from an assumed kinetic mechanism. These calculations were demonstrated for ethylene propylene and butyl elastomers.     

田菁胶的理化性能

叙述了从不同渠道收集的 12个样品理化性能的测定结果。结果表明 :改性后的田菁胶各种性能指标均接近国外进口的瓜尔胶 ,是瓜尔胶理想的替代品     

Physical and chemical properties of soybean proteins

Recent physical and chemical studies are reviewed for Bowman-Birk and Kunitz trypsin inhibitors, agglutinin, and 7S and 11S globulins of soybeans. Differences between gelation properties of crude 7S and 11S globulin fractions are also discussed.     

高浓度有机化工废水的物化处理技术

本文详述了高浓度化工废水的基本特征,介绍了该类废水的各种物理化学处理方法和国内外应用现状。     

Physical principles of using polyelectrolyte hydrogels for purifying and enrichment technologies

The main physical regularities which allow one to use a strongly charged hydrogel in purifying and/or enrichment technologies are analyzed. The proposed cyclic method is based on the two known phenomena—the salt concentration redistribution in the presence of the polyelectrolyte hydrogel and the reversible gel contraction under electric current. It is shown that in order to obtain high degrees of purification and/or concentration the salt concentration must be lower than that of the polymer. Under these conditions, there is no dependence on the nature of the salt and the cycle may be repeated several times without regeneration of the gel. © 1995 John Wiley & Sons, Inc.     

Physical and chemical stress relaxation of a fluoroelastomer

Stress relaxation measurements were made at various temperatures on V-747-7, a commercial high-temperature rubber formulation from the Parker Seal Company. The data were analyzed by separating the chemical and physical relaxation processes by a method described in an earlier publication. The chemical relaxation process was found to be Arrhenius with an activation energy of 35.7 kcal/mole. The results allow us to predict the relative useful lifetimes of this material up to approximately 320°C.