Rare Earth in Light Industry and Textile Industry

- Nov 14, 2017 -

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First, the rare earth in the textile and leather industry applications

 

Rare earth for the textile and leather industry is China's scientific and technological workers pioneered a unique field of rare earth applications, the prospects are very broad. After years of research and promotion, process technology is also improving, and achieved significant economic and social benefits. Rare earth in the textile and leather industry is mainly used for leather tanning, fur dyeing, cotton spinning, wool and synthetic fiber printing and dyeing. As the rare earth dyeing is a new process which is formed on the basis of the original dyeing process and equipment and is properly improved, which lays the foundation for the promotion of the rare earth dyeing process.

 

Rare earth help dye

 

Rare earth (mainly with rare earth chloride) added in the acid dyes (including strong acid, weak acid and acid medium dye), play a role in helping dye, dye uptake rate can be adjusted to adjust the dye and fiber affinity and improve color fastness, Improve fiber color, appearance quality and softness, save dye and reduce environmental pollution, reduce labor intensity and reduce power consumption.

 

Rare earth dyeing applications have been more than 10 years of history. Rare earth has been used in wool, acrylic, cotton, nylon, silk, viscose, rayon, linen, ramie and other natural fibers, chemical fiber and its blends to help dye. He has successively promoted Rare Earth Assist Technology in hundreds of textile enterprises in more than 20 provinces, cities and autonomous regions and achieved remarkable economic and social benefits. Rare earth help with dye, dyeing rate increased, reducing the amount of additives, the amount of water is also reduced, reducing and reducing the sewage discharge and treatment costs.

 

Rare earth help tanning

 

Rare earth tanning aid can not only improve the leather grade, but also reduce costs. Tanning leather with rare earth mixed tanning agent, can replace part of the red vanadium, a large reduction in the amount of chromium, reducing the tannery wastewater pollution on the environment. Tanning with rare earth mixed tanning products, meticulous leather surface, skin soft, shiny fur luster fluffy, feel good, wash, reduce odor, tensile strength and resistance to cracking and chemical properties have reached the level of pure chrome tanning, there are More significant economic and social benefits.

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Second, the application of rare earth in the plastics industry

 

Since the "Seventh Five-Year Plan", the application of rare earth in this field has made long-term development, China has developed a rare earth plastic stabilizer, rare earth added MC nylon.

 

Plastic industry is an important basic raw material industry. Rare earth compounds are mainly used as plastic additives in the plastics industry. Plastic additives can not only significantly improve the processing performance of plastics and the use of performance, but also reduce its production costs, reduce energy consumption and improve production efficiency. Therefore, additives for the development of the plastics industry can not be ignored with an important role. Rare earth can be used as a thermal stabilizer of PVC plastic, eliminating lead, cadmium and other heavy metal pollution, improve product performance. As a modifier of rare earth can make China's important MC nylon engineering plastics physical and chemical properties significantly improved.

 

Rare earth stabilizer for PVC processing is a rare earth application developed recently in recent years and has shown very good application prospects. The product to 30% lanthanum oxide as the main raw material, there are now goods for sale, but not many manufacturers, the scale of production is also small. Some technical problems have not yet been completely solved. Some products called rare earth stabilizer, in fact, just add a small amount of rare earth in their products. China's PVC plastic materials are mainly used for civil construction materials, steel doors and windows is its main product. According to the national building energy-saving plan, the state will encourage the development of plastic-steel windows and doors, restrictions on the use of aluminum windows and doors, from 2000 onwards, aluminum doors and windows will be replaced by plastic doors and windows. With the development of China's plastic processing industry, rare earth in the field will have a big development. According to the calculation of 100 domestic plastic building materials enterprises, 10,000 tons of rare earth stabilizers are required each year, which consumes 3,000 tons of rare earth.

 

The red pigment used in the plastics industry is inorganic, organic two categories. Inorganic salts are cadmium, lead and iron salts. Cadmium salt bright red, but cadmium poisoning, and increasingly subject to environmental protection restrictions; lead salt is orange red, but also due to toxic should not be used; iron salt is reddish brown, not bright. Organic red although colorful, but its covering ability, dispersion ability, anti-leakage and thermal stability are not as good as inorganic pigments. Inorganic pigments are also not easily faded and deformed. France Rhodia company developed a rare earth sulfide Ce2S3 inorganic red pigment, this pigment non-toxic, no environmental problems. In the polypropylene plastic trial. It is reported that cadmium pigments are used in 87% and 80% of the plastics in the United States and Europe, respectively. In these two markets, more than 2,100 tons of pigments are required each year, and the plastic consumption in the world exceeds 43 million tons per year. Rare earth sulfide pigments will provide a substantial new market for rare earths.

 

In addition, we should also actively carry out the research of plastic functional additives, such as the use of fluorescent properties of rare earth compounds, made of light-emitting plastic; the use of rare earth magnetic materials, made of magnetic plastic; the use of rare earth compound light conversion properties, made with light conversion Nature of plastic, these products not only the market is vast, but also the social and people's lives urgently needed.

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Third, the application of rare earth in the paint industry

 

Rare earth paint driers. Paint is a very versatile paint that is used from bridges and buildings to a variety of vehicles and machinery, from home windows and doors, to furniture to colorful toys for children.

 

Paint driers are indispensable additives in the paint industry. If you do not add driers, the paint film is difficult to dry naturally, often take days or even months, and add the drier can be shortened to a few hours, you can dry the film. The main disadvantages of paint manufacturing industry are the cobalt / lead driers. The main disadvantage is that lead is poisonous and precipitates easily, while cobalt is expensive, with less resources and mainly imported. In particular, lead, as a result of its toxicity, can harm human health and pollute the environment. Internationally, the amount of lead in paint is severely restricted, especially in children's toys and furniture.

 

Since the 1980s, our country's scientists and technologists have been researching and developing a series of rare earth paint driers, which have been successfully used in the paint production of dozens of varieties in five major categories. At present, the annual amount of rare earth driers in our country is more than 3,000 Ton, the application of various types of paint 15 to 200,000 tons. Rare earth driers commonly used rare earth fatty acids and rare earth naphthenic acid complex as raw material. They can partly or even completely replace the components of the traditional driers such as lead, manganese, zinc and calcium, can obviously reduce the amount of cobalt, can produce low-lead or lead-free paint, and can simplify the production process. The produced paint has the advantages of light color, strong adhesion, fresh and dry paint film and markedly improved paint quality, which has created a new road for paint manufacturing in China and has good economic and environmental benefits.

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Fourth, the application of rare earth in building materials

 

Construction industry is one of the pillar industries in our country. Rare earth also has a broad application prospect in the construction industry. Demand for materials in construction is diversified and high-performance. High-strength low-alloy steel with rare earth, stainless steel in the building is widely used in high-rise buildings, stadiums, railway engineering, bridge engineering, construction of the harbor and offshore oil derrick and large hydropower station. Shanghai has 10,000 tons of rare earth steel for Yangpu Bridge, Oriental Pearl TV Tower, viaducts and large stadium projects. In addition, now there are rare earth elements as additives to burn the cement, which added 0.02% ~ 0.05% of rare earth oxides can be all or part of the replacement of iron in cement raw materials, can significantly improve the strength and yield of cement, reduce Energy consumption and production costs. In the construction industry, rare earth insulation materials, rare earth waterproof insulation coatings and high-performance buildings wall materials with good thermal insulation and waterproofing effect.

 

Rare earth in light industry and textile industry is very broad prospects for the application, the market also has obvious Chinese characteristics. Since the Seventh Five-Year Plan, the application of rare earth in this field has made great progress. China has developed dozens of rare earth driers, rare earth insulation materials, rare earth plastic stabilizers, various rare earth organic-inorganic catalysts and rare earth additives. At present, China's rare earth driers production technology is very mature, it is used by the paint industry, it instead of cobalt and other traditional organometallic siccatives, with lead-free low toxicity and other advantages, the current annual needs of rare earth driers 7,000 tons, Have greater market potential. Table 1 lists the 1990-2003 China's rare earth in light industrial and textile consumption.


Table 1 1990-2003 China's rare earth consumption in light industry and textiles (REO, ton)

Year

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

Consumption

70

100

100

130

170

190

190

190

190

190

190

190

190

200

As can be seen from Table 1, the application of rare earth in light industry and textile industry has obviously increased since 1990, mainly due to the expansion of rare earth paint driers and plastic heat stabilizers. From 1996 to 2003, the consumption of rare earth in the textile industry basically unchanged, indicating that the application of rare earth in this area has entered a stable period.


Article from NdFeB Industry Network

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