Characteristics of PVA 1788
Polyvinyl alcohol PVA 1788 sheet; odorless, soluble in water at 60-80°C. Its aqueous solution has good adhesion, film-forming and emulsifying properties; it is resistant to most organic solvents such as oils, lubricants and hydrocarbons; it has chemical properties such as esterification, etherification and acetalization of long-chain polyols. Film-forming property: PVA 1788 is easy to form […]
Main features of pharmaceutical grade PVA
The main characteristics of pharmaceutical grade PVA include film properties, gas barrier properties, adhesion, and hygroscopicity. Goshenol has good gas resistance to many gases, such as oxygen, nitrogen, carbon dioxide, and the tablets and pills made of it can maintain the efficacy for a long time. At the same time, as a polyvinyl alcohol for […]
Features of polyvinyl alcohol film
Polyvinyl alcohol film is colorless and transparent, with good mechanical strength, smooth surface without stickiness, low gas permeability of hydrogen, oxygen, carbon dioxide, good oil and solvent resistance, high moisture permeability, no static electricity, No vacuuming, good printing performance and so on. As a packaging material, PVA can prevent the intrusion of oxygen to prevent […]
Control of PVA Film Thickness
In cast film production, the uniformity of film thickness is an important indicator of product quality. As a requirement of quality control management, it should be tested and adjusted in real time so that it can be continuously produced within the range that meets the requirements. The uniformity of film thickness directly affects the quality […]
How to identify the quality of PVA water-soluble film products
1) Water solubility: Cold water soluble film requires that water can be dissolved in water above 4 ℃. The faster it dissolves the better. The less residue remaining after dissolution, the better. The clearer the dissolved water, the better. 2) Appearance quality: The smoother the winding, the better. There should be no obvious unevenness and […]
The production method of Vinyl Acetate
Acetylene method Using zinc acetate supported on activated carbon as a catalyst, acetylene and acetic acid are reacted under normal pressure and 170-230 ℃. The reaction product is subjected to powder separation, gas separation, aldehyde removal, crude distillation and rectification to obtain refined vinyl acetate. Ethylene gas phase method Ethylene, oxygen and acetic acid are […]
Introduce Joyfoce PVA 2488
With its excellent water-solubility, bonding strength, film forming properties and chemical stabilities, Polyvinyl alcohol(PVOH, PVA) has achieved a great reputation in both global and domestic markets as an industrial material or finishing agent for adhesives, paper, emulsion, suspension, fabric, and films. Product Feature: Partially Hydrolyzed. High viscosity. Adjust particle size according to actual demand. Equivalent Grades: […]
A series of chemical modification of PVA (polyvinyl alcohol) resin
Through a series of chemical modifications to PVA (polyvinyl alcohol) resin, the water resistance of PVA and the compactness of the arrangement of PVA molecules are improved, so that it is difficult for gas molecules to pass through the coating. At the same time, a high-barrier ore body is added to the coating solution to […]
Several grades of Polyvinyl Alcohol recommended
Construction adhesives and adhesives Construction adhesives made from polyvinyl alcohol include putty adhesives, paint adhesive base materials, etc., and their scale accounts for more than 40% of the total. At present, the most widely used are PVA 1799, PVA 2099, two medium-viscosity adhesives, and PVA 2499, PVA 2699, two high-viscosity adhesives. In addition to construction adhesives, polyvinyl alcohol can […]
消泡剤入りポリビニルアルコール
Polyvinyl alcohol is an organic compound, white flake, flocculent or powdery solid without taste. Polyvinyl alcohol is an important chemical raw material for the manufacture of gasoline-resistant pipes and vinylon fibers, fabric treatment agents, emulsifiers, adhesives and glues, etc., but when polyvinyl alcohol is added, polyvinyl alcohol has a certain surface Active, due to directional […]
