Development, Popularization and Application of New Type Carton Moistureproof Varnish

Carton is a packing and transportation box made of corrugated paper. It is an indispensable packaging container in production and life. It has the characteristics of light and strong protection of goods, recyclable use, and convenient loading and unloading. It is widely used in household appliances, The transportation and packaging of textiles, foods and other products. As a kind of green packaging material, cardboard boxes are deeply favored by environmental protection modern society. With the increase of the commodity market and people’s consumption level, in addition to the use of high-quality water-based ink printing, medium and high-grade cartons need to be coated with a new type of carton moisture-proof varnishes to make them look high-grade, high-quality, and multi-colored. The development of strong visual effects not only expands the product's promotional functions, but also increases the functions of the carton in terms of moisture resistance, heat resistance, and water resistance, making the carton durable in retail and transportation.

The new carton moisture-proof varnish completely overcomes the shortcomings of traditional products such as slow drying speed, easy adhesion, dry color, impact on the carton ink, pollution to the environment, poor moisture-proof effect, etc. It is an organic solvent-free solution. , Non-toxic, non-irritating odor, non-corrosive, non-flammable, non-explosive liquid coating agent. It can be widely applied to the moisture proofing and polishing of corrugated cartons of any product. Both the hand brush and the machine brush are brushed once. The surface of the corrugated box after the coating of the product is enhanced in abrasion resistance, and the light resistance of the ink is also increased. The heat and moisture resistance and the strength of the carton make the carton resistant to scratches, high strength, and good resistance to water and moisture, and it can beautify and protect the carton for a long time.

The following is a description of the development of a new type of carton moisture-proof coating.

First, the development process.

The traditional carton moisture-proof oil is prepared with tung oil as the main raw material and appropriate amount of organic solvent. Its characteristics are good moisture-proof performance and good gloss, but the operation cost is high and the drying speed is slow. In recent years, carton moisture-proof oils made of polyurethanes and alkyd-based polymer resins as main raw materials have been superior to traditional products in terms of brushing properties and drying speed, but they have poor gloss, poor stability, and are relatively brittle. Curing speed is slow. In addition, the above-mentioned moisture-proof oil is also troublesome in operation, and needs to use bone glue and starch to make a bottom, which not only occupies the site, but also has low efficiency, and some of them also have an impact on the environment. The moisture-proofing agent made from useful waste polystyrene foam and waste polystyrene foam opens up new and cheap raw material resources for the carton. However, when the carton box is cut, the water-repellent adhesive tape is not sticky and the carton is handled. Easy slippery problem.

Selection of paraffin wax, rosin, oxidized polyethylene and other polymer raw materials as the main raw materials, refined by chemical reaction processing a new type of carton moisture-proof coating oil, after trials in brushing, drying speed, luster, etc. have excellent performance The characteristics, and the raw materials are cheap and easy to obtain, the production process is scientific and reasonable, the product quality is stable, has certain promotion practical value.

1. Equipped with methods. Take 6% to 12% of paraffin, 5% to 8% of oxidized polyethylene, 10% to 16% of rosin, other emulsifiers, brighteners, regulators, etc., in appropriate amounts, and put it into four ports equipped with electric agitators and reflux condensers. In the flask, it is emulsified under certain conditions, and then stirred to raise the temperature. When the temperature reaches about 200°C, the thermostat makes the reaction cool down when the reaction is complete, and the temperature can be decreased when the adjusting agent is added to adjust the pH to 8.5-9.5. material.

2. Product main performance indicators Appearance: light yellow viscous liquid, non-toxic, non-irritating odor Solid content: 20% to 32% viscosity (coating 3-4 cups/sec, 25°C), drying time: 7-10 minutes, PH Value: 8.5-9.550 ± 30 seconds. When the emulsifier emulsifies water-insoluble paraffin wax, oxidized polyethylene and other resins, the emulsion is applied to the corrugated box and penetrates into the carton, forming a transparent film on the surface. The film is bright and flexible, so it has good The glazing effect, and coating film is insoluble in water, so that it has excellent moisture resistance effect.

Second, promotion and application.

The new carton moisture-proof varnish is compared with traditional moisture-proof oils. The results are summarized as follows: The new carton moisture-proof oil is characterized by low cost of waterproof, heat-proof, moisture-proof, firm coating, no pollution during production and use, and no “three wastes”. "It can completely replace the traditional moisture-proof oil. It is particularly convenient for the gravure printing process currently used in the packaging industry, and has a very good value for development and utilization."