Method for producing water-soluble poval air permeable thin film and products thereof
A technology of polyvinyl alcohol and its production method, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., and can solve problems such as white pollution and difficult decomposition
Active Publication Date: 2007-06-06
GRI MEDICAL & ELECTRONICS TECH CO LTD
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Problems solved by technology
[0006] What the present invention is to solve is that the existing microporous breathable film produced by materials such as polyethylene breathable film and polyurethane breathable film is not easy to decompose in the natural environment, but remains in nature in the form of waste for a long time, becoming "white pollution" "question
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[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0013] Add 30 to 45 kg of raw polyvinyl alcohol (PVA) powder, add 300 kg of water, put it into a reaction vessel with a stirrer with a jacketed water bath heating device, stir for half an hour, then raise the temperature to 90°C to 95°C while stirring, and keep warm Until the polyvinyl alcohol is completely dissolved. Add plasticizer 3 to 9kg, filler 25 to 80kg, leveling agent 1.5 to 5kg, defoamer 0.5 to 3kg. After stirring evenly, vacuum defoaming to obtain polyvinyl alcohol solution, and then send the obtained polyvinyl alcohol solution into the storage tank, and then pass through the steel strip coating device or the drum coating device to uniformly coat the polyvinyl alcohol solution in the storage tank Coat it on a plane transmission device, dry it to form a film under hot air below about 90°C to obtain an original film, and send the obtained orig...
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Abstract
The present invention discloses the production process and product of permeating water soluble PVA film. The production process includes the following steps: mixing PVA material powder in 30-45 kg and water in 200-400 kg in a reactor with water bath heater and stirrer, stirring for 20-40 min, heating to 90-95 deg.c while stirring, and maintaining to dissolve PVA completely; adding plasticizer in 3-9 kg, stuffing in 25-80 kg, leveling agent in 1.5-5 kg and defoaming agent in 0.5-3 kg through stirring homogeneously; vacuum defoaming, coating homogeneously onto planar transmission set, drying with hot air to form film; biaxial drawing, heat treatment, edge cutting and winding. The product has permeating micropores, is poromeric, may be degraded naturally into CO2 and water fast without any pollutant left, and is especially suitable for making disposable sanitary product.
Description
technical field [0001] The invention relates to the production field of a film, in particular to a production method of a water-soluble polyvinyl alcohol breathable film and a product thereof. Background technique [0002] In the long-term application of plastic film, it is produced according to the use under different conditions. Because the conventional application of film only pays attention to its barrier properties in packaging and other industries. With the improvement of the scientific level and the improvement of living standards, it is proposed that the fresh-keeping packaging of fruits and vegetables should not be packaged with strong barrier plastic film. Because of the experiment, it was found that although the fruits and vegetables leave the main branches or land that depend on them for survival, they are still To be energetic, to breathe oxygen, and to need water, so we try to make a film that can breathe and retain water. This kind of ...
Claims
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IPC IPC(8): B01D71/38B01D67/00B01D69/06
Inventor 唐岷
Owner GRI MEDICAL & ELECTRONICS TECH CO LTD