摘要
涂料行业是建筑、工业领域的配套行业,也是使用原材料最为广泛的工业之一[1,2]。自2003年以来,世界涂料业发展迅猛其产量约以5%逐年递增,中国做为涂料需求大国增幅最大其产量也约以6.4%逐年递增[3,4]。由于传统涂料的生产和使用会对环境造成一定的污染,粉末涂料凭其低VOC、高涂装效率及优异的工艺特性脱颖而出。目前中国已成为仅次于美国的第二大粉末涂料生产国。
粉末涂料是20世纪60年代开始发展起来的一项涂料新品种、新技术,具有节省能源和资源、减少环境污染、工艺简便、易实现自动化、涂层坚固耐用、无公害、劳动生产效率高、粉末可回收等特点[5]。粉末涂料是一种含有100%固体成分、以固态粉末状态存在并以粉末状态进行涂装,然后加热熔融流平,固化成膜的涂料[6]。粉末涂料与一般溶剂型涂料和水性涂料不同,不是使用溶剂或水作为分散介质,而是借助于空气作为分散介质。目前,粉末涂料的应用已涉及到家用电器、仪器仪表等二十多个行业,取得了巨大的经济和社会效益。
三(环氧丙基)异氰尿酸酯(TGIC)是应用于粉末涂料中的一种固化剂。由于其具有热稳定性好、耐候性好、耐黄变性优、力学性能卓越而被广泛使用[7]。近年来,由于资源的各种不合理利用,TGIC生产行业中的大量资源和能源变成“三废”排入环境,造成了严重的环境污染,防治生产污染刻不容缓。从我国经济和环境的总体情况及有效防治环境污染的发展趋势来看,实行清洁生产具有积极的意义[8]。
通过改进TGIC传统的生产工艺[9]:用干燥取代了传统的脱水方法,从根本上减少了脱水过程中产生的污水;选用高效的催化剂及阻聚剂,大大提高了产品的收率;采用减压分馏等方法分离产物,减少了产物分离过程中产物的损失及污染;并根据实际的工业生产情况,解决了TGIC生产过程中母液和含盐废水的排放问题,制成了新型的紫外光固化树脂和水溶性树脂两种副产品,不仅实现了清洁生产还增加了企业的收益。
Paint industry is not only a supporting industries of the construction and industrial areas, but also the one of the most widely used industrial raw materials. [1,2] Since 2003, the world paint industry has rapidly developed its yield and the yearly basis about 5%, As a country of big needs on paint ,China has also increased its output biggest about to 6.4 percent year on year. [3,4] Because the production and the use of the traditional coating make certain environmental pollution, Powder Coatings in its sole low VOC, high efficiency and excellent coating process characteristics come to the fore. At present, China has become the second largest powder coatings producer after the United States.
Powder coating is the coating of new varieties and new technology, with saving energy and resources, reducing environmental pollution, simple process, easy automation, coating sturdiness and durability, and pollution-free, high labor and production efficiency, recoverable powder characteristics since the 1960s[5]. Powder coating is a composition which containing 100% solid, solid powder to the state exists and the state to powder coating, and then melt flow-heating, curing the coating film[6]. Powder coating is different from the solvent-based paint and general waterborne coatings, instead of using water as a solvent or dispersion medium, but through the use of air as a dispersion medium. At present, the applications of the powder coating are related to household appliances, instruments, and so more than 20 industries, has made tremendous economic and social benefits.
TGIC is widely used as a curing agent in the powder coating because of its good thermal stability, weatherability, and resistant yellow degeneration excellent, excellent mechanical properties[7]. In recent years, because of all kinds of irrational uses of resources, a lot of resources and energy was made into the environment as "three wastes"in the production of TGIC industries, causing serious environmental pollution, pollution control production delay. China's economy and the environment from the overall situation of the effective prevention and treatment of environmental pollution and development, the implementation of cleaner production has positive significance[8].
The traditional production process is improved[9]:the traditional method of dehydration is replaced by torrefaction,in order to reduce the sewerage appeared during the dehydration radically;high efficient catalyzer and polymerization inhibitor are chosen to greatly improved the yield of product;methods like decompress fractionation are chosen to separate the product,in order to reduce the product’s loss and pollution during the process of separation;base on the actual industrial produce,the problem of the liquid which have to be vent during the process is solved,and the liquid is translate into a new UV-cured coating, the cost is reduce, the corporation’s income is increase,and the cleaner production is achieved.
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