Aluminum foil for packaging and printing (hard aluminum foil of 0.2mm ～ 0.25mm and soft aluminum foil of 0.07mm ～ 0.09mm), also known as varnish and OP protective agent. This article focuses on elaborating and introducing the composition, formulation design and application results of five varieties of three types of environmentally friendly varnishes, which are developed using environmentally friendly varnishes: room temperature curing, high temperature curing and light curing.
The main task of aluminum foil varnish
The main task of aluminum foil varnish is to coat a semi-finished product of all single-print or multi-color overprinted precision packaging printing with a protective layer. Its purpose is to further promote the surface gloss, appearance, acid resistance, alkali resistance, etc. of packaging and printing products, and at the same time protect the printed graphic ink film. Not only does it increase the surface hardness of printed products, but also has a certain flexibility, it can also improve the quality of packaging and printing products, and enhance the high added value of commodity packaging.
From the use of aluminum foil varnish, we already know its main task. However, people only use room temperature solidified varnishes for food packaging in their application range, especially in the past three years, the fashionable beer seal (top) packaging logo is more colorful. Generally, high temperature 121 ~ 160 ℃ glazing oil is used for cooking beverage cans, cigarette packs and pharmaceutical packaging.
With the national drug packaging container (material) standard up to now (June 1, 2004), the traditional test is based on GB12255-90 only specifications, volatiles, adhesive coating amount difference, heat seal strength, protective layer Five items, such as heat resistance, have been replaced by YBB00132002 (Composite Films and Bags for Drug Packaging). This not only marks the integration of China's packaging products, especially pharmaceutical packaging products, with international standards, but also the end of traditional varnish products. The advent of environmentally friendly aluminum foil varnish marks the beginning of new varnish products. The basis for the development of its products:
One is: (1) Identification of infrared spectrum; (2) Appearance; (3) Barrier properties (steam and oxygen); (4) Mechanical properties; (5) Heat-sealing strength of composite bags (double and multi-layer); ( 6) Residual amount of solvent; (7) Pressure resistance of the bag (three-side sealed bag and other bags); (8) Drop performance of the bag (total mass of bag and contents and drop height); (9) Dissolution test: â‘ Heavy metals; â‘¡Easily oxidized; â‘¢Non-volatile matter; (10) Microbial limits (general composite film, bag; external drug composite film, bag, etc.) (11) Abnormal toxicity.
The second is: YBB00132002 stipulates (1) composite film refers to a film formed by combining various plastics with paper, metal or other plastics through an adhesive, and its thickness is generally not more than 0.25mm; (2) the composite bag passes the composite film According to the bag-making method, bags made by heat sealing can be divided into three-side sealed bags, middle sealed bags, organ bags, self-supporting bags, zipper bags, etc. Moreover, the classification, barrier performance, mechanical performance, drop performance, microbial limit index, dimensional deviation, etc. of the composite membrane are clearly specified. The author revolves around environmental protection and integration with the international market. In addition to physical measurement, measurement of physical and chemical indicators has been added. At the same time, since the total residual amount of solvent was 30 mg / m2 in the past, it is now changed to 10 mg / m2 and the benzene residual limit is 3.0 mg / m2. Combined with sodium thiosulfate titration solution (0.01mol / L) to titrate to the near end, add 0.25ml of starch indicator solution, continue to titrate to colorless, and take the water blank solution to operate in the same way, the difference between the two consumption titration solution shall not be Exceeding the harsh limit of 1.5ml. Plus glazing oil can not change color, fade, fade or side light at 180-250 ℃ for 10 seconds (both heat and light, softening point is too high, and it is caused by conduction) . At the same time, it should also meet the following technical requirements: (1) good color retention performance, graphics and text after migration at a certain temperature, no migration, no yellowing, no color change, or ink ink film does not drop; (2) has a certain brightness and firmness , Adhesive tape will not fall off after sticking and pulling; (3) It should have certain affinity when contacting with white printing ink or color ink and primer; (4) High solid content and low viscosity, high transparency, especially smooth and refreshing Good performance; (5) It can withstand die cutting without damaging the knife after varnish film formation, and can withstand mechanical impacts such as embossing and punching.
The basic composition of aluminum foil varnish
The basic composition of environmentally friendly aluminum foil packaging varnish is: resin, solvent, filler, additives. At present, most of the varnish systems for aluminum foil packaging at room temperature are mainly thermoplastic resins, while the general high temperature (120-160 ° C) aluminum varnish systems use thermoplastic resins, and then add a small amount of thermosetting resin or amphoteric resin, but they High-temperature (180-250 ℃) aluminum foil packaging varnish system uses thermosetting resin and amphoteric resin. The choice of resin is: acrylic resin, nitrocellulose, polyamide resin, natural rosin modified resin, phenolic resin, silicone resin, polyketone resin, amino resin and so on. The proportion of the solvent is mainly alcohol, ester, ketone, and benzene is the auxiliary. Additives include leveling agents, slip agents, trace light stabilizers and heat stabilizers.
At present, in addition to the above introduction, the aluminum varnish resin cured at room temperature is completely non-toxic, and most of them choose polyamide resins with higher softening points and amphoteric nitrocellulose or homopolyketone and terpene resins. It is also composed of vinyl resin and nitrocellulose to prevent back sticking at a certain temperature. The selection and compatibility of solvents are based on low odor and multiple mixed solvents to achieve the balance of volatile gradient of the varnish in the process of coating and film formation (drying both inside and outside). As for the selection of additives, it is mainly affordable and affordable, to ensure that the homogeneous varnish reaches different coating areas (amounts), and at the same time, at the same coating amount, the lowest cost and the lowest total solvent are controlled. Two residues and benzene residue. For example, the composition (formulation) of the mixed solvent: acetone 47.14, ethyl acetate 35.35, industrial ethanol 17.51, as a thinner for varnish. The advantages of using ethyl acetate solvent alone are: the solvent smell on aluminum foil packaging printing is small, the solvent residue is small, the film drying speed is fast, the adhesion fastness is good, the gloss of the varnish is high and the cost of the thinner solvent is low.
Varnishes in general high temperature resistant 121-160 ° C or even 180 ° C aluminum foil packaging are composed of modified rosin ester with nitrocellulose or high softening point polyamide resin or nitrocellulose added with amino resin. There is also a thermoplastic acrylic resin with a high softening point and a vinegar resin. Now high temperature resistant (180-250 ℃ or higher glazing oil) aluminum foil packaging glazing oil is composed of thermosetting resin and amphoteric resin and silicone resin grafting and mixing. In order to control easy oxides, stabilizers are often introduced. In order to control the generation of abnormal toxicity, any words such as O, H, Cl, etc. appearing in resins, solvents, additives and even pigments and dye molecules are not allowed to be selected. The theory of oxides is: (1) The compound formed by the combination of elements and oxidation. The oxide referred to here refers to an ionic or covalent oxide formed by oxygen joining with a single atom. In addition, there are peroxides, superoxides, ozonides, organic oxides (such as ethylene oxide), etc., the same element can have different valence oxides. Such as: sulfur dioxide SO2 and sulfur trioxide SO3; cuprous oxide Cu2O and copper oxide CuO, the preparation methods are: ①Elemental or compound burning in air or pure oxygen, can get common oxides; ② At red heat temperature, Use water vapor to oxidize element to oxide; ③Use nitric acid as oxidant to oxidize some elements into oxide; ④ Dehydration of hydroxide or thermal decomposition of carbonate and nitrate; ⑤ Add alkali to salt solvent to Remove the precipitated hydroxide or oxide, and then dehydrate and dry; ⑥ reduce the high oxidation state oxide with a reducing agent to obtain low oxidation state oxide. (2) Compounds composed of metal or nonmetal and oxidation. The same element can have several oxides with different valences. For example, carbon monoxide CO and carbon dioxide CO2 and copper oxide CuO; iron monoxide FeO, ferric oxide Fe2O3 and ferric oxide Fe3O4. Oxides can be divided into acidic oxides, basic oxides, amphoteric oxides and inert oxides.
In order to achieve strong adhesion, in this product system, in addition to strict solubility, hydrogen bonding force, surface tension, boiling point, volatilization rate and evaporation rate, the appropriate amount of wetting aid is introduced, which is beneficial to varnish and printing graphics The affinity of the ink film. The purpose is to bypass the technical barriers and realize the scientific and standardization of varnish (protective agent) on aluminum foil. The production process of aluminum foil varnish is to put solvent in raw material-input resin-disperse and dissolve at startup-add additive-scrape sample-test.
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