新型解联剂及再生助剂用量对废胎面胶胶粉再生效果的影响

采用自主研发的双螺杆挤出机对废胎面胶胶粉进行再生,研究了新型解联剂以及活化剂580、石蜡油和柠檬烯等再生助剂的用量对再生胶力学性能的影响。结果表明,适量的新型解联剂、活化剂580、石蜡油和柠檬烯能够提高再生胶的力学性能,当再生胶基础配方中新型解联剂、活化剂580、石蜡油、柠檬烯用量分别为3,2,3,1份时,废胶粉的再生效果最佳,综合力学性能最好。

丁基胶囊再生新工艺的影响因素

将废旧丁基橡胶(IIR)胶囊和解联剂、石腊油通过自制的同步转子实验密炼机混炼制备了IIR再生胶,考察了填充系数(β)、转子转速、混炼时间、解联剂及石蜡油用量对IIR再生胶硫化胶物理机械性能的影响。结果表明:当在β值为1、转子转速为100 r/min、混炼时间为15 min、解联剂为3.5份、石蜡油为5份的工艺条件下,IIR再生胶硫化胶的物理机械性能达到最佳。

不同力化学法制得胎面再生胶的试验研究

分别采用密炼机、串联式密炼机和密炼挤出一体机对废胎面胶胶粉进行再生,对比研究自制再生胶和市售再生胶与不同比例天然橡胶共混试验。结果表明,添加自主研发的再生解联剂,三种力化学法均能实现废橡胶低温再生,且采用密炼挤出一体机制得再生胶综合性能最好,共混性能优于市售再生胶。

Study on Enhancement of PCBs Desorption in Soil by Surfactants

[Objective]The aim of this paper was to provide theoretical basis for study on enhancement of surfactants to desorption of PCBs from soil. [Method]The desorption effects of surfactants SDBs,Tween 80,HTAB on PCBs were studied as well as their distribution in water and soil. Effects of rationing on desorption of PCBs were also analyzed. [Result]The potential of single surfactant to enhance the desorption of PCBs from soil in order was Tween 80 SDBS HTAB. Three surfactants were largely adsorbed on soil and the sorption followed HTABTween 80SDBS. The desorption of PCBs increased significantly and linearly with the increase of aqueous micelle concentration of surfactants. [Conclusion]Enhancing effect of three surfactants on PCBs desorption were obtained,which will provide theoretical basis for further analyzing.

Measurement and Correlation of Solubilities of Adipic Acid in Different Solvents

Using a simple and reliable apparatus, the solubilities of adipic acid in water, ethanol, chloroform, n-butanol and acetone are determined by the analytic method. The results are correlated with λh equation, Apelblat equation, and UNIFAC equation. The solubilities calculated by these models are in good agreement with experi-mental data, so that the models can meet the requirements of engineering design.

Measurement and Correlation of Solubility of Ethyl Nitrite in Mixed Solvent

An experimental apparatus was used to measure the solubility of ethyl nitrite in mixed solvents under the lower pressure and higher temperature. The solubilities of ethyl nitrite in mixed solvents of ethanol-water at 15℃-40℃ and ethanol-diethyl oxalate at 20℃--40℃ were determined. A Henry constant model has been improved, and the interaction parameters have been fitted from experimental data. The calculation results have been compared with experimental data； the results obtained are satisfactory.

Measurement and Correlation for Solubility of 2-Chloro-5-chloromethylpyridine in Different Solvents

2-Chloro-5-chloromethylpyridine is a crucial intermediate of pesticides.Its solid-liquid equilibrium data will provide essential support for industrial design and further theoretical studies.The solubilities of 2-chloro-5-chloromethylpyridine in water,methanol,ethanol,ethyl acetate,acetone,trichloromethane and toluene at different temperatures were measured using the synthetic method by a laser monitoring observation technique. The solubility data were correlated with the modified Apelblat equation and Wilson equation.The calculated values were in good agreement with the experimental values.

Study on Biological Properties of HA-TMP Cross-linked Products

Objective:In the medium of ethanol(non-polar),STMP and ADH as crosslinkers to HA,to prepare drug delivery microspheres by getting stable cross-linked products without a gel phase,and to study biocompatibility and biodegradability of cross-linked products.Methods:ISO10993.1-Safety Evaluation of Biomedical materials as a reference,to make hemolysis test,percutaneous stimulation test,acute toxicity test,and analyze in vitro degradation test,and degradation products.Results:HA-STMP cross-linked product had no hemolysis,no irritation,no acute systemic toxicity,but HA-ADH had a mild skin irritation and adverse acute systemic toxicity.HA-STMP cross-linked product had lower sensitivity on HAse and the curve is flatting.With the increase of degradation time HA-STMP results were changed by the structure analysis,degradation products of these cells were no toxicity.Conclusion:HA-STMP cross-linked products with better biocompatibility and better resistance to hydrolysis could delay the degradation time,which is suitable for the preparation of biodegradable drug carriers.

Measurement and Correlation for Solubility of Diosgenin in Some Mixed Solvents

The solubility data of diosgenin in mixed systems of ethanol ＋ 1-propanol （1 ： 1）, ethanol ＋ 1-butanol （1 ： 1）, ethanol ＋ isobutyl alcohol （1 ： 1）, methanol ＋ isobutyl alcohol （1 ： 1）, methanol ＋ isobutyl alcohol （1 ： 4）, ethanol ＋ 1-pentanol （1 ： 1） and carbon tetrachloride were measured over the temperature range from 289.15 K to 334.15 K by a laser monitoring observation technique at atmospheric pressure, with all mixtures mixed by volume ratio. The Apelblat equation, the ideal solution model, and the 2h equation are used to correlate the solubility data. The results show that the three models agree well with the experimental data, providing essential support for industrial design and further theoretical study.

废胎面胶再生工艺方法及性能研究

利用自主研制混炼成型一体机以及智能开炼机,采用低温再生方法,通过设计3×4正交实验表,研究废胎面胶再生利用过程中解联再生温度、芳烃油、石蜡油、解联剂添加量的变化对再生橡胶物理机械性能的影响。实验表明,当解联再生温度为90℃,芳烃油用量为3份,石蜡油用量为2份,解联剂添加量为2份时,再生橡胶的物理机械性能达到最佳。