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Textile raw material resource substitution is a protracted war

2014-11-27 Hits:682
As long as human beings exist one day, textile and clothing is essential to the people's livelihood industry. To maintain the sustainable development of this industry, resource issues must be resolved. Only from the point of view of the current structure of the textile raw materials, cotton and chemical fiber respectively occupy half of the country, wool, linen, silk and other resources occupy a small proportion. Cotton price fluctuations and the world cotton shrinking, determines the will gradually reduce the proportion of cotton in raw material pattern; chemical fiber in the past ten years strong momentum of development and proper meantime, but deadly, more than 90% of the chemical fiber products rely on oil resources.
In fact, in recent years, the textile and chemical fiber industry has made it clear that the sustainable development of the industry is a "bright road" - biomass fiber and bio chemical industry. But because the industry itself is in the primary stage, the real economic benefits and social benefits of the need for a short time, and therefore need to participate in a wider range of forces. The two session of the "biomass fiber and biochemical raw materials forum" held in China's Bio Industry Conference, the industry sounded the charge number. In particular, in the 30 years to achieve the initial raw material replacement and replacement process, the forum conducted in-depth and specific exploration.
Application of cellulose but also to get rid of obstacles
The ultimate goal of the development of biomass fiber and bio chemical raw materials is to realize the substitution of raw materials and process. At the same time, the use of traditional methods to achieve the development of textile and chemical fiber product differentiation has come to an end, biochemical technology will bring a new breakthrough in product differentiation. Therefore, recently in the forum to explore a wide range of "bio fiber and biochemical materials science and industry 30 years development roadmap (hereinafter referred to as the '30 years roadmap')" preliminary planning: by 2020 textile and chemical fiber industry to use biomass fiber raw materials to achieve the substitute 5%, 10% in 2030, 2040 will reach 20%, then the textile raw material pattern will be more diversified, bottleneck resources will be effectively alleviated.
Data is indeed tempting, but the support of what is a feasible way to achieve these goals? The industry believes that the development of straw, bamboo, hemp isokinetic raw wood, rich viscose fiber and regenerated cellulose fiber raw material pattern is the first thing to consider. The roadmap in 30 specific said: regenerated cellulose fiber industry 2020 raw materials (except outside the existing linter pulp, raw materials) instead of 10%, by 2030 to reach 20%, 2040 reach 40%;
Cellulose is the most abundant polymer material, which is endowed by nature. It is not only a source of extensive, but also a renewable resource. Scientists estimate that the nature by photosynthesis every year can produce hundreds of billions of tons of cellulose. However, only about 60 million tons of cellulose are used by people. The biggest obstacle to the application of cellulose in the development of natural cellulose has a high degree of crystallinity, and there are a large number of hydrogen bonds between the molecules and the molecules, so that it is not soluble in most organic solvents. To wheat straw, rice straw and crop straw fiber as an example, the short fiber, uneven prominent; less fiber content, complex cells; high ash content, silicon content.
From the current commonly used plant materials, cotton linter cellulose content of the highest, more than 95%, and wood cellulose content of only 40% ~ 50%, bamboo, straw cellulose content was lower. How to separate the textile fiber from the natural resources efficiently, clean and economically, the big problem has attracted the attention of many people. According to the Chinese Academy of Sciences, Institute of process engineering, Chen Hongzhang researcher, the research group in the field of straw pulp and chemical raw materials in the preparation of the stage results achieved. They broke through the single component use, to steam explosion as the core technology, the realization of the fractionation of straw, make full use of the components of multilevel conversion technology, to achieve the full utilization of the biomass straw resource, and develop test on multi product eco industrial chain.
Although some progress has been made, it is still to be developed for the utilization of natural resources. Therefore, the roadmap in 30 will straw with high efficiency and low energy consumption of pre treatment technology, biological French hemp processing technology, efficient low cost cellulose bacterium and enzyme production technology, ionic liquid medium application in cellulose producing high value products technology, lignin modified processing technology, wood element melting spinning technology, industrial enzymes and biological catalyst, comprehensive utilization of marine biomass, biomass fiber high performance technology, biomass biomass full use of technology integration and ecological industry chain, the establishment of the 10, as the industry common technology and the foundation of, in order to make a breakthrough.
Multi path method
Study on the new process, on the one hand is to use nature more extensive resources, on the other hand is to the production process more efficient, clean, reduce energy use and environmental hazards is mentioned in the roadmap in 30 with biochemical technology to realize process substitution ". 30 years of road map preliminary planning, the average level of the industry in 2020 to replace the process will reach 5% in 2030 to achieve 17%, 2040 growth to 24%.
From at the end of the 19th century invention viscose production of regenerated cellulose fiber till now. More than 100 years in the past, all production of biomass fibers of new technologies continue to emerge. However, from the point of view of fiber yield ratio, viscose method still occupy the unshakable dominance. Although the viscose fiber industry in cleaner production and a lot of effort, but also achieved remarkable results, but the pulping process in the production of black liquor can not completely eliminate the pollution of the environment. It is in order to solve this problem completely, the industry is more and more brave, for many years to explore environmentally friendly and efficient new
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