Development and Application of Environment-friendly Aluminum Foil Varnish

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Aluminum foil for packaging and printing (hard aluminum foil of 0.2mm to 0.25mm and soft aluminum foil of 0.07mm to 0.09mm) is used for coating and printing. It is also known as varnish and OP protector. This article focuses on the description and introduction of the material composition, formulation design, and application results of the five types of ambient-curing, high-temperature-curing, and light-curable three types that have been developed entirely using domestically produced raw materials.

The main task of aluminum foil coating

The main task of aluminum foil varnish is to coat semi-finished products that have been printed in all single-print or multi-color overprinting and then apply a protective layer. Its purpose is to further promote the surface gloss of packaging and printing products, aesthetics, acid, alkali, etc., while protecting the printed ink film. Not only increase the surface hardness of printed products, but also has a certain degree of flexibility, but also can improve the packaging printing product quality rate, improve the high value of the packaging of goods.

From the use of aluminum foil varnish, we already know its main task. However, people use only room-temperature curing varnishes for food packaging in their scope of application. In particular, in the past three years, the fashionable beer packaging (top) packaging labels have become colorful. The general high temperature 121 to 160°C coating oil is used for cooking beverage cans, cigarette packs and pharmaceutical packaging.

With the implementation of the National Drug Packaging Container (Materials) Standard (currently June 1, 2004), the traditional test is based on GB12255-90 only with specifications, volatiles, adhesive coating amount difference, heat seal strength, protective layer Five items, such as heat resistance, were replaced by YBB00132002 (composite film for pharmaceutical packaging, general rule for bags). This not only marks the convergence of China's packaging products, especially pharmaceutical packaging products, with international standards, but also marks the end of traditional coating products. The advent of eco-friendly aluminum foil varnish marks the beginning of new varnish products. The basis for the development of its products:

The first is: (1) identification of infrared spectroscopy; (2) appearance; (3) barrier properties (water vapor and oxygen); (4) mechanical properties; (5) heat sealing strength of composite bags (double and multiple layers); 6) Solvent residue volume; (7) pressure resistance of the bag (three sided seals and other bags); (8) drop performance of the bag (bag and contents total mass and drop height); (9) dissolution test: 1 Heavy metal; 2 Easily oxidized; 3 Non-volatile; (10) Microbial limits (general composite membranes, bags, external composite membranes, bags, etc.) (11) Abnormal toxicity.

The second is: YBB00132002 stipulates that (1) composite film means a film formed by combining various plastics with paper, metal or other plastics through a combination of adhesives, and the thickness thereof is generally not more than 0.25 mm; (2) the composite bag system passes the composite film through The bags made by the heat-sealing method can be divided into three-side sealing bags, middle sealing bags, organ bags, self-standing bags, zipper bags and the like in the form of bags. In addition, the classification, barrier properties, mechanical properties, drop performance, microbiological limit indices, and dimensional deviations of the composite film are expressly specified. The author revolves around environmental protection and integration with the international market. In addition to physical measurements, the author also increased the measurement of physical and chemical indicators. At the same time, since the total residual amount of solvent in the past was 30 mg/m2, it was changed to 10 mg/m2 and the benzene residual limit was 3.0 mg/m2. Combined with the first titration with sodium thiosulfate (0.01mol/L) titration to near the end, the added starch indicator solution 0.25ml, continue to titrate to colorless, and the other blank solution to take the same method of operation, the difference between the two consumption titrants shall not Over 1.5ml of harsh restrictions. Adding Varnish to 180-250°C, 10 seconds without discoloration, no discoloration, no discoloration, no sidelighting (both due to heat and light, both due to high softening point and due to electrical conductivity) . At the same time should also comply with the following technical requirements: (1) good color retention performance, do not migrate after a certain temperature drying graphics, no yellowing, no discoloration or ink ink film can not block; (2) have a certain degree of brightness, fastness Adhesive tape does not peel off; (3) It should have certain affinity with white printing ink or color ink and base oil; (4) High solid content, low viscosity, high transparency, especially smooth and smooth Good; (5) After coating, it can resist die-cutting, does not hurt the knife, and can withstand mechanical impact such as embossing and punching.

Basic composition of aluminum foil varnish

The basic composition of the environmental-friendly aluminum foil packaging varnish is: resin, solvent, filler and auxiliary agent. At present, aluminum foils are mainly coated with thermoplastic resin in the coating system of the varnish, while the general high-temperature (120-160°C) aluminum foil varnish system is made of thermoplastic resin, and a small amount of thermosetting resin or amphiphilic resin is added. In the high temperature (180-250°C) aluminum foil packaging varnish system, thermosetting resins and amphoteric resins are used. The choices of its resins include: acrylic resins, nitrocellulose, polyamide resins, natural rosin modified resins, phenolic resins, organic silicone resins, polyketone resins, amino resins, and the like. Its solvent ratio is mainly alcohol, ester, ketone, benzene supplemented. Auxiliaries include leveling agents, slip agents, trace amounts of light stabilizers, and thermal stabilizers.

Aluminium foil coating recipe examples:

High Temperature Aluminum Foil Varnish (Formula One) Test Report

Remarks: 1. Production of the product at 160°C and 200°C, respectively (batch coating, see Table 1), of which 2 are comprehensive records;

2. Venue: Henan Kaidi Drug Packing Material Co., Ltd.

3. Time: morning of June 6, 2004 (the same test date);

4. Test basis: GB12255-90;

5. The aluminum foil adopts 0.024×140mm prime aluminum foil (PTP);

6. Pharmaceutical aluminum foil inspection records (see Table 1).

Table 1 Medical Test Record

1. Determination of volatiles

Take 100mm×100mm two pieces

Index: ≤4mg/0.02m2

Weight before drying (mg) 1109.30

Weight after drying (mg) 1109.30

Volatile matter (mg/0.02m2) measurement result 0.20 qualified

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