Method for rapidly cold-sealing corrugated cartons with corn starch adhesive 2

NiSO4 is particularly effective in accelerating the decomposition of NaCLO, and it can increase the solubility of starch in water, improve the permeability and film forming ability, and improve the bonding ability, but the amount needs special attention, otherwise it will not be catalytic.

4.3 Effect of Adhesive

The amount of gelatinizer NaOH has a great influence on the adhesive fluidity and depth of gelatinization. The amount is too little, the gelatinization is not complete, the glue is turbid, the fluidity is poor, and it is difficult to store; when the amount is too large, the hydrogen bonds of a large number of starch molecules are destroyed, the adhesive force and the moisture resistance are reduced, and the glue is not easy to apply, or the glue appears. Paper products are highly corrosive. The appropriate amount to control in 10-13% is appropriate.

4.4 Influence of Complexing Agents

The complexing agent borax has the effect of increasing the cylinder, increasing the initial tack, and shortening the drying time, but the amount of borax has to be strictly controlled. More, it will produce a larger network structure with starch, enveloping the water molecules into a gel, making the adhesive's fluidity worse, making it difficult to sizing, making the adhesive layer brittle, etc.; less, gluing Not enough, poor adhesive power, easy to cause corrugated cardboard degumming after the machine.

4.5 Effect of terminators

The terminating agent can stop the continuous reaction of the oxidizing agent with the adhesive so that the adhesive can be stored for a longer period of time. The amount of terminator should be appropriate, too much, the cost will increase accordingly; too little, the adhesive will freeze and the storage period will be too short. Through experimental exploration, we have chosen sodium sulfate, the amount of 0.3-0.4%.

(5) Handling of product quality problems

Adhesive common quality problems are dealt with as follows:

Adhesive quality solution is too thin or run to add borax thickening; reduce the amount of water; reduce the amount of oxidizer over-thickened caused by runners to increase the amount of oxidants; prolong the reaction time; reduce the amount of borax; add thinner urea summer too crisp to add plastic The agent thickens in storage to increase the amount of NaOH solution; Increase the amount of oxidant; Add formaldehyde, NaCl or Na2SO4
Drying speed is slow to increase solid content, reduce water volume; add filler or water-soluble polymer foam to reduce the amount of alkali; add defoamer

(6) Conclusion

The corn starch adhesive produced by the method described above has not only good performance, simple process, low equipment investment, no “three wastes”, but also the paperboard, carton, and carton bonded with the product have a smooth surface and no yellowing. Moisture absorption, firm bonding, no degumming, no running, etc., and has high compressive strength, puncture strength, peel strength, and its main technical quality indicators meet or exceed the requirements of export packaging cartons. (Finish)