Process Condition Control of Polyvinyl Alcohol Dry Composite Membrane

日期:2019/8/13 8:51:37 / 阅读: / 来源:本站

Process Condition Control of Polyvinyl Alcohol Dry Composite Membrane
(1) Surface treatment of the substrate The solution for measuring the surface tension was prepared in accordance with ASTMDA 578.
The main factors affecting the surface treatment of the film: 1 gap between the electrodes; 2 line speed; 3 electrode voltage.
(2) Adhesives Polyurethane adhesives are used, consisting of polyoxoesters and hydroxyl-containing polyesters, polyethers or polyols.
Polyurethane adhesives are available in single and two components.
The one-component polyammonia adhesive consists of a linear polyester or a poly-isocyanate to form a shaped elastomer with a hydroxyl group at the end. It is easy to use, can be cured at room temperature, has certain strength and initiality, and is also The molecule contains a base and is resistant to various chemicals. However, since the degree of crosslinking is too low, the low temperature is good, and the heat resistance and moisture resistance are poor. The two-component polyurethane adhesive has a high degree of crosslinking between the two components and a single component, and has a product which reacts with the -NCO isocyanate at the end, so that the temperature resistance is good.
E-270 and C-30 are two-component adhesives with fast cross-linking speed, good heat resistance, water resistance and chemical resistance. They can be used for high temperature (121 ° C) disinfection. Therefore, they can be used for cooking food. package.
A-160 is a two-component adhesive with strong initial tackiness. The prepared composite film can only be used in general fast food packaging, and the sterilization temperature is below 95 °C.
Adokdo 333E is a one-component adhesive that can only be used for low temperature sterilization.
(3) Composite molding
1) Line speed is 2-20m/min
2) The temperature of the composite roll does not exceed 70 ° C
3) Composite roll pressure, about 0.5MPa
(4) Examples of process parameters
1) Discharge treatment
1 voltage 9kV or more.
2 electrode between the original: 2-2.5mm
3-wire speed: 34m/muna
4 surface capacity of 38mN / m or more
2) Adhesive formula
Seikbaond E-270 100 servings
C-30 20 to 30 parts.
Diluent ethyl acetate 100-200 parts.
3) Coating and compounding
1 The coating amount is about 5 g/m 2 (dry).
2 coating roller gap, 1~2" roller, film storage +10m
2 to 3# rolls 30m.
3 drying temperature 40 ~ 60 ° C.
4 exhaust air volume: 2/3 ~ full open.
5 composite temperature: 50 ~ 70 ° C.
4) ripening
For LDPE/PVA/LDPE, the practical strength is 24h after compounding, and it takes 5-7 days to fully cure. For heat resistance, oil resistance, etc., it must be aged at 40 ° C for more than 48 h.

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