Kinetics and mechanism of thermal degradation of vegetable-tanned leather fiber

Liu, Jie; Luo, Lan; Hu, Yadi; Wang, Fang; Zheng, Xuejing; Tang, Keyong

doi:10.1186/s42825-019-0010-z

Cited by 36 publications

(20 citation statements)

References 44 publications

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“…The study in [1] considers conditions for the primary processing of semi-finished leather products. The studies in [2][3][4] refer to the improvement of the technology of liquid processing of semi-finished leather products.…”

Section: Introductionmentioning

confidence: 99%

Study of the Efficiency of Squeezing Moisture-Saturated Products

2021

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The leather industry includes many technological machines; a squeezing roller machine is used in many operations, for example, in squeezing, degreasing, and after drum dyeing of a semi-finished leather product. The paper presents the results of experimental studies obtained by determining the influence of multilayer wet leather semi-finished products with monshons under squeezing on the amount of the moisture extracted. Mathematical dependences of the amount of the moisture extracted, for each layer of a five-layer wet leather semi-finished product on the feed rate between the squeeze rollers and the roller pressure were obtained. Experimental research is of scientific and practical importance for the development of a technological process for extracting moisture from wet leather semi-finished products used in the tannery, since the quality of the extraction affects the quality of subsequent technological operations, such as leather shaping and splitting. An experimental study was performed using the method of mathematical statistics, namely, the method of mathematical planning of the experiment. Mathematical models were obtained for the amount of extracted moisture from five wet leather semi-finished products depending on the rate of their simultaneous feed and the pressure of the squeezing rollers. The results of the experiment showed that in squeezing a five-layer product, the productivity of the technological process of extracting moisture from wet leather semi-finished products increases by five times in comparison with existing squeezing roller machines. The use of the results of the experimental study will contribute to a significant reduction in the energy consumption of the squeezing roller machine by simultaneous multi-layer processing of wet leather semi-finished products

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Section: Introductionmentioning

confidence: 99%

Study of the Efficiency of Squeezing Moisture-Saturated Products

2021

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“…DTG can show slight changes in the slope of TG curves, and the temperature peak ( T max ) from DTG curves [Figure (b)] represented the maximum decomposition rate of the samples . Peaks of the membranes were given, GE film at ~321 °C, while SGE, SGE‐G, and SGE‐G‐C all at ~335 °C, and particularly SGE‐G‐N at ~344 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Action of silicic acid derived from sodium silicate precursor toward improving performances of porous gelatin membrane

Zhang

Liu

Gao

et al. 2020

J of Applied Polymer Sci

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To gain an insight into understanding how the silica network generated from hydrolysis and condensation of silicic acid, derived from sodium silicate, enhancing hydrothermal stability and mechanical properties of the leather, and particularly which active groups playing a main role for interaction of silica with collagen protein molecules, herein, effects of incorporated amino or carboxyl groups on the properties of silicic acid modified gelatin (GE) membrane were intensively studied. We found when lots of amino groups were introduced by adding a modified melamine, the thermal denaturation temperature, uniformity of pore diameter distribution and mechanical strength of GE membrane distinctly increased, while incorporating plenty of carboxyl groups by adding low polymerization degree acrylic acid polymer, no obvious change of performances of GE film was discovered. In addition, utilization of γ-glycidoxypropyltrimethoxysilane had a positive effect on the porosity and flexibility of GE membrane. Importantly, our results indicated that hydrogen bonding probably played the most important role toward improving performances of porous GE film when treated with silicic acid. These findings are greatly beneficial for developing a chrome-free tanning technology based on silicon containing materials, and are also suggestive for fabricating porous silica-GE hybrid materials using sodium silicate as a precursor.

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“…2. Except water evaporation (0~160°C), only one region of decomposition appeared in the temperature range of 160~800°C for all these samples [41,42]. The onset decomposition temperature (T onset ) and char yield at 800°C increased with the increase in CF dosage.…”

Section: Effect Of Cf Dosage On the Flammability Of Cf/nr Compositesmentioning

confidence: 99%

Effects of collagen fiber addition on the combustion and thermal stability of natural rubber

Wen

et al. 2020

J Leather Sci Eng

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Collagen fiber (CF) and silane coupling agent-modified collagen fiber (MCF) were used as flame retardant filler for natural rubber (NR) modification. The combustion phenomena and properties of composites blended with different dosages of CF or MCF were compared to elucidate the flame retardant mechanism of the composites. The flame retardancy of NR can be enhanced effectively by increasing nitrogen content (the nitrogen content of CF is about 18%), creating air pockets, and structuring the flame retardant network in the composites. MCF failed to structure a flame retardant network in the composite, indicating that its modification effects of MCF are weaker than those of CF. When CF dosage was 30 wt%, the composite can achieve the best flame retardancy, with limited oxygen index of 29.4% and without smoke and dripping during burning. This study demonstrated a new method for the flame retardant modification of NR. Graphical abstract

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Kinetics and mechanism of thermal degradation of vegetable-tanned leather fiber

Cited by 36 publications

References 44 publications

Study of the Efficiency of Squeezing Moisture-Saturated Products

Study of the Efficiency of Squeezing Moisture-Saturated Products

Action of silicic acid derived from sodium silicate precursor toward improving performances of porous gelatin membrane

Effects of collagen fiber addition on the combustion and thermal stability of natural rubber

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