PVA's dry extrusion technology has been one of the technical problems that have not been solved by the plastics processing industry at home and abroad for many years. The demand for PVA films in China's market is large, and most of them rely on imported high prices from abroad. The granulation and blown film process of water-soluble high-barrier PVA is based on domestic equipment, and achieves PVA dry granulation and blown film, retaining PVA's excellent properties such as water solubility, barrier properties, and biodegradability. Compared with wet processing technology, it has the advantages of simple process, low energy consumption, high efficiency, and low investment. At the same time, PVA dry pellets can produce multi-layer co-extruded high barrier materials and containers, broadening the new application fields of PVA resins, and is a breakthrough in PVA processing technology. The technology is innovative, fills the domestic gap, is at home in the lead and reaches the international advanced level. The industrialization of this project can stimulate the development of industries such as raw materials and packaging in China, with obvious economic, social and environmental benefits.
This patented technology is based on the 500-ton/year demonstration production line, through the formula design of compound modifier system and the improvement and improvement of key equipments, overcoming the decomposition temperature and processing temperature of PVA, the melt viscosity is large, and the fluidity is poor. , Cooling and other shortcomings, technical feasibility, process controllability, product quality and stability. In addition, due to the use of dry blow molding, the technology has improved production efficiency and reduced production costs. The estimated cost is about 23 thousand yuan per ton, while the current US (wet) price is 13 thousand yuan/ton to 170,000 yuan. RMB/ton, Japanese (wet) products sell for 200,000 yuan/ton to 250,000 yuan/ton, domestic coating (wet) products have an average selling price of 60,000 yuan/ton, so it has a strong market Competitiveness.
Reproduced from: China Plastics Additives Network