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To solve the problems of poor wettability and improve pad dyeing performance, wool fabrics were pretreated with hydroxylamine to remove bound lipids on the surface of wool and then modified with L-cysteine through disulfide bond breaking and reforming reactions. The effect of the concentration, pH, temperature, and treatment time of hydroxylamine or L-cysteine solutions on hydrophilicity of wool fabrics was investigated by single factor experiments. The performance of pad dyeing of the modified wool fabrics is also assessed. The results show that under the optimum process conditions, the absorption time of water is about 2 s. The optimum process conditions are: hydroxylamine 7% (owf), sodium hydroxide 16.7 x 10-2 mol/ L, treatment at 70 °C for 40 min; L-cysteine 20 % (owf), ammonia water 4.7 x 10-2 mol/ L, treated at 60 °C for 30 min. After pad dyeing of reactive dyes, the K / S value of modified wool increase by 95. 5% when compared with unmodified wool fabrics. Besides, the dye distribution of fiber cross-section becomes uniform, and the rubbing fastness is also improved. [ABSTRACT FROM AUTHOR]

During the COVID-19 epidemic, our national guidelines have suggested that surgical patients should wear a mask to decrease the potential transmission of COVID-19 in the operating room, as long as the condition allows. However, so far, there is no study to discuss the influence of wearing a mask on the ventilation and blood oxygenation status in patients of spontaneous breathing with supplementary oxygen through an anesthetic facemask. This is a before-after study in the same patient, and 10 healthy volunteers were recruited, by testing the arterial blood gas parameters at key time points before and after oxygen inhalation to evaluate the effects of two different supplementary oxygen methods ('disposable medical mask + anesthetic facemask' and 'anesthetic facemask only') on the oxygenation of subjects. Our data demonstrated whether wearing a disposable medical mask or not could effectively increase the oxygen supply of the subjects compared with the basic value before oxygen inhalation; however, compared with the group without mask, the arterial oxygen partial (PaO 2 ) reduced significantly at each time points when subjects wearing a disposable medical mask. There was no significant difference in other parameters, and our data showed that age growth and smoking had no significant effects on the difference of PaO 2 between the groups with and without masks. This study demonstrates effective oxygen supplementation through anesthetic facemask in subjects with spontaneous breathing who is wearing a disposable medical mask, whose pulse oxygen saturation and arterial oxygen saturation can reach 100% rapidly, and this provides a theoretical basis for the management of patients with disseminated respiratory diseases to wear masks in the operating room; however, the rate and amount of PaO 2 increase are both decreased as compared to those who is not wearing a disposable medical mask during supplementary oxygenation. Whether this difference will affect the clinical outcome needs further study.