Part 1 definition description
Noun interpretation
Polyvinyl alcohol (Pva) is an organic compound, white flake, flocculent or powdery solid, tasteless.
Production process
The production process of PVA mainly includes acetylene method and ethylene method:
Acetylene method is that acetylene and acetic acid vapor react in a reactor under atmospheric pressure and 170 ~ 230 ℃ through zinc acetate catalyst with activated carbon as carrier. VAC product is obtained after condensation, separation and refining of reaction product mixture;
Ethylene method is that ethylene, oxygen and acetic acid vapor react in a fixed bed reactor under the action of precious metal Pd Au (PT) catalyst and potassium acetate cocatalyst at 100 ~ 200 ℃ and 0.6 ~ 0.8MPa. The reaction products are separated and rectified to obtain VAC products;
Part 2 industry analysis
market size
The scale of China's PVA market grew steadily, reaching 730000 tons in 2018.
Upstream raw materials
The upstream raw materials of PVA are mainly vinyl acetate, calcium carbide and glacial acetic acid;
The supply of vinyl acetate in China mainly comes from domestic production capacity, especially in the northwest region with energy advantages;
Calcium carbide in China is mainly used to produce PVC, and only 4.3% is used to produce vinyl acetate. There is a correlation between the price of vinyl acetate and the price of calcium carbide, but the trend is not completely consistent;
Acetic acid ester is mainly used in the production of acetic acid ester in the lower reaches of ice and North China, and PTA is mainly used in the production of acetic acid ester in China;
In 2018, China's PVA production capacity was 1.206 million tons and its output was 746000 tons. It is the world's largest PVA producer.
Downstream application
Globally, the downstream consumption structure of PVA is mainly in polymerization additives, fabric size, adhesives, pulp and coatings, and the downstream demand structure is relatively dispersed;
More than 70% of PVA in China from the 1970s to 1980s was used in the production of vinylon limit. With the continuous development of application fields, it has also been diversified:
Part 3 future trends
China's PVA production capacity has been able to meet the downstream demand, and the development of conventional demand is relatively stable, while the PVB Resin and PVA optical film in the downstream high-end products will develop rapidly.
PVB resin
PVB is a resin formed by polycondensation of high molecular polyvinyl alcohol and butyraldehyde;
The application market of PVB is mainly divided into: high-end - automotive glass, solar panel, high-rise building safety glass, medium and low-end - ordinary building safety glass;
At present, the global PVB high-end market is mainly monopolized by DuPont, shounuo, Shuishui and cola Li, with a market share of more than 80%;
In 2016, the global demand for PVB resin was about 420000 tons, while China's demand was about 104000 tons, while the domestic output was only 30000 tons, which was heavily dependent on imports;
In the next five years, the global demand for PVB resin will increase by more than 6%, and that in China will increase by more than 10%;
In the next five years, the global demand for PVB film will increase by more than 7%, and that in China will increase by more than 15%;
In 2020, the global demand for PVB film will exceed 734000 tons, and China's demand will account for 35% of the world;
PVA optical film
PVA optical film is a thin and uniform dielectric film with PVA as the main material and attached to the surface of optical devices;
PVA optical film is mainly used in liquid crystal panel, including antireflection film, polarizer, wide vision cornea, prism film, diffusion film, reflection film, etc;
At present, PVA optical film is monopolized by two enterprises in Japan, kelaoli and synthetic chemistry. Kelaoli accounts for about 70-80% of the global production capacity;
As the first enterprise in China to independently develop, produce and sell PVA optical film products, wanwei hi tech has been increasing R & D and production, and will make greater contributions to the localization of PVA optical film in the future.
