The Study Of Foam Finishing Liquid And Foam Performance And Application In Production

Foam finishing is a low liquid rate,less pollution and high energy-saving dyeing and finishing technology.In the 1970s,with the outbreak of Middle East oil crisis,it developed rapidly in the industrialized countries in Europe and the United States.It is to pass the gas into the working fluid containing surfactants solution,after being cuted and mixed by the bubble generator, generate many small and uniform bubbles,and form a large bubble.And then,the bubbles are to be imposed onto fabrics.So that the up-take percentage from the traditional rate of 60%-80% downs to 15%-30%,thus saves drying energy more than 50%.In the 1980s,China ever appeared a wave of high tide on the research of foam finishing. Some of research achievements had ever been applied by many printing and dyeing enterprises. According to incomplete statistics,yield a variety of fabrics nearly 10 millions meters.The products were put into domestic and foreign markets after pass the quality inspection.However,at that time,as to low level of automation equipment and technical restrictions,the technology could not be continued to further promotion in the development and application.In recent years,with the energy crisis and environmental problems intensified,it has greatly enhanced people's awareness of environmental protection.Simultaneously,all of the printing and dyeing enterprises have the double pressure in production costs,energy consumption and waste emissions.More importantly,promoted by the national "11th Five-Year Plan",proposed energy-saving,lower consumption,emission reduction policies,foam finishing regains people's attention and favor.It is reported that,some domestic and foreign research institutes and enterprises are actively exploring new foam finishing technology and equipments,and so far,has made gratifying achievements. The composition of foam finishing solution and properties of foams is the key part of the foam finishing technology.According to the new situation of ecological environmental protection requirements,the composition of foam finishing solution and properties of foams were studied Systematically in this thesis.Using Ross-Miles foaming method and stiring foaming trial,two foaming agents suitable for foam finishing were selected.One was NaLS(anions),the other was detergent JU(non-ionic).HEC was elected as foam stabilizer and discussed the stability mechanism on the NaLS foaming Solution.Primary factors influencing foaming performance and stability of the system were analyzed,including the molecular structure and concentration of foaming agents,the complex of anionic/noninonic surfactant,finishing agents,inorganic salt, ambient temperature,pH value and so on.In addition,it also explored the decay of the bubble and stability mechanism in this paper.Through a microscope analysis of the bubble size distribution, discussed the impact of bubble size distribution and uniformity on the foam stability.The components and systematic compatibility and foam stability of foam finishing sulution in following technology:softening,resin finishing,fire-proofing,anti-UV finish,sizing and whitening finish,were researched.Foam was coated onto the fabrics by manual in the laboratory, by comparing the treated fabrics between foam finishing process and conventional padding process concerning the relevant physical performances and finishing results,it was proved that the foam finishing sulutions above were in line with the requirements of foam processing,and also provided a basis for the production in the future.By the production applications trial in a printing and dyeing mill in Zhejiang province,it was confirmed that foam finishing products have the same quality as conventional finishing products,as well as reflected the superiority of foam finishing process with low up-take,high-efficiency,great energy saving and excellent effects.