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(I) Several factors that affect the quality of adhesives
1, viscosity
The viscosity is also the expression of the initial viscosity of the adhesive. The level of the initial viscosity directly affects the adhesive performance of the corrugated cardboard. Therefore, the quality control of the adhesive can be expressed by the “viscosityâ€.
(1) Viscosity and temperature
Temperature (°C) 55 60 65
Viscosity (initial) 50 65 140
The sufficient swelling of the starch granules requires a certain temperature, which is mainly provided by heating and caustic soda solution. Therefore, in order to make the viscosity of the adhesive suitable, it is necessary to pay attention to the control of the water temperature and the addition amount of caustic soda.
(2) Borax and Viscosity
Borax (kg) 1.8 2
Viscosity (seconds) 60 100
The amount of borax is also a factor affecting the viscosity, the actual application must be appropriate, the amount of small, so that the adhesive is too thin and easy to penetrate into the paper, causing corrugated cardboard run, collapse; a large amount of adhesive will become Rubbery loses adhesion.
Adjust the viscosity method:
When the viscosity is high, the starch content in the carrier can be appropriately reduced;
When the viscosity is low, the borax solution can be properly added.
2, aging temperature
The temperature at which the starch binder starts to thicken and shows adhesive properties due to the gradual ripening of raw starch in the binder raw material.
Due to the different quality of starch or starch, the maturation temperature is different. Therefore, in actual operation, the heating temperature needs to be adjusted, and the adjustment of the amount of caustic soda is mainly adopted.
3. Solid content in starch binder
Measuring the solid content in the adhesive is a method of judging the binding ability.
Common formula: g3-g1
Solid content = one hundred and eleven one hundred 100%
G2-g1
g1——Aluminum weigher kg
G2 - Wet adhesive plus weigh plate kg
g3——After drying, the adhesive adds weighing plate kg
4, PH value (acid, alkaline)
We know that starch granules contain certain fatty acids and react with caustic soda solution to neutralize weakly alkaline binders. Therefore, the pH of the binder can be determined to know whether the reaction is complete or not. The quality of the mixture.
PH value should generally be between 8-9.
5, equipment performance and other factors
In the process of adhesive preparation, the influence of equipment performance, instruments, and meters cannot be ignored.
(to be continued)
Formulation and Use of Carton Starch Adhesives II
Second, use