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Development and application of environmental friendly aluminum foil glazing oil

aluminum foil for packaging and printing (usually 0.2mm ~ 0.25mm hard aluminum foil and 0.07mm ~ 0.09mm soft aluminum foil) glazing oil, also known as gloss and op protective agent. This paper mainly expounds and introduces the material composition, formula design and application results of five varieties of environment-friendly glazing oil, which are developed by completely using domestic raw materials and belong to three types: normal temperature curing, high temperature curing and light curing

the main task of aluminum foil varnish is to coat a protective layer on the semi-finished products of fine packaging printing that have completed all single printing or multi-color overprint. Its purpose is to further promote the surface gloss, beauty, acid and alkali resistance of packaging and printing products, while protecting the printed graphic ink film. It not only increases the surface hardness of printed products, but also has a certain flexibility. It can also improve the genuine rate of packaging and printing, and enhance the high added value of commodity packaging. From the use of aluminum foil varnish, we have known its main task. However, in its scope of application, people only use room temperature curing varnish for food packaging, especially in the past three years, the fashionable beer sealing (top) packaging logo is more colorful. Generally, the glazing oil with high temperature resistance of 121 ~ 160 ℃ is used for cooking beverage cans, cigarette packs and drug packages. With the implementation of the national standard for drug packaging containers (materials) so far (June 1st, 2004), the traditional testing basis GB has only five items: specification, volatile matter, difference in adhesive coating amount, heat sealing strength, and heat resistance of protective layer, which have begun to be replaced by YBB (general rules for 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 marks the end of the traditional glazing products. The advent of environmental friendly aluminum foil glazing oil marks the beginning of new glazing products. The basis of product development is: (1) identification of infrared spectrum; (2) Appearance; (3) Barrier performance (water vapor and oxygen); (4) Mechanical properties; (5) Heat sealing strength of composite bags (double-layer and multi-layer); (6) Solvent residue; (7) Pressure resistance of bags (three side sealed bags and other bags); (8) Drop performance of bags (total mass of bags and contents and drop height); (9) Dissolution test: ① heavy metals; ② Easily oxidized; ③ Nonvolatile matter; (10) Microbial limit (general composite membrane, bag; external drug composite membrane, bag, etc.) (11) abnormal toxicity. Second, YBB stipulates that (1) composite film refers to the film formed by the combination of various plastics and paper, metal or other plastics through adhesives, and its thickness is generally not greater than 0.25mm; (2) Composite bag is a bag made of composite film by heat sealing. According to the bag making form, it can be divided into three side sealed bag, middle sealed bag, organ bag, self-supporting bag, zipper bag, etc. Moreover, the classification, barrier performance, mechanical performance, drop performance, microbial limit index, size deviation, etc. of the composite membrane are clearly specified. Focusing on environmental protection and connecting with the international market, the author adds the measurement of physical and chemical indicators in addition to physical measurement. At the same time, since the total residue of solvent was 30mg/m2 in the past, it is now changed to 10 mg/m2 and the benzene residue limit is 3.0 mg/m2. When titrating with sodium thiosulfate titrant (0.01mol/l) to the near end point, add 0.25ml of starch indicator solution, and continue titrating until it is colorless. In addition, take blank solution and operate in the same way. The difference between the two titrant consumption shall not exceed the harsh limit of 1.5ml. In addition, the varnish can not change color, fade, fade or shine for 10 seconds at ℃ (both due to heat and light, both due to high softening point and conductivity). At the same time, it should also meet the following technical requirements: (1) good color retention performance, no migration, no yellowing, no discoloration or ink film falling off after drying at a certain temperature; (2) It has a certain brightness and firmness, and the adhesive tape will not fall off when it is pulled; (3) It should have certain affinity when contacting with white printing ink or color ink and base oil; (4) High solid content, low viscosity, high transparency, especially good leveling and smoothness; (5) After the Polish film is formed, it can withstand die cutting without hurting the knife, and can withstand mechanical shocks such as flowers and holes

basic composition of aluminum foil glazing oil the basic composition of environmental friendly aluminum foil packaging glazing oil is: resin, solvent, filler, additives. At present, the normal temperature aluminum foil packaging varnish system is mainly thermoplastic resin, while the general high temperature (℃) aluminum foil varnish system uses thermoplastic resin, and then adds a small amount of thermosetting resin or amphoteric resin, but the high temperature (℃) aluminum foil packaging varnish system uses thermosetting resin and amphoteric resin. The resin choices are: acrylic resin, nitrocellulose, polyamide resin, natural rosin modified tree, but the short board is also an obvious constraint factor for the development of plastics in China, such as resin, phenolic resin, silicone resin, polyketide resin, amino resin, etc. The solvent ratio is mainly alcohol, ester and ketone, supplemented by benzene. Additives include leveling agents, smoothing agents, and trace light stabilizers and heat stabilizers. At present, in addition to the above introduction, most of the room temperature cured aluminum foil varnish resins are composed of polyamide resin with high softening point, amphoteric nitrocellulose or polyketone and terpene resin, as well as ethylene resin and nitrocellulose, so as to prevent sticking back at a certain temperature. The selection and compatibility of solvents are based on small odor and multiple mixed solvents to achieve the evaporation gradient balance of glazing oil in the coating film-forming process (both inside and outside dry). As for the choice of additives, they are mainly affordable, so as to ensure that the same glazing oil can reach different coating areas (quantities). At the same time, when the same coating amount is used, the lowest cost is achieved and in order to control the lowest total solvent residue and benzene residue. For example, the composition (formula) of the mixed solvent: acetone 47.14, ethyl acetate 35.35, industrial ethanol 17.51, as the diluent of the glazing oil. The advantages of using ethyl acetate solvent alone are that the solvent smell on aluminum foil packaging and printing is small, the solvent residue is small, the film-forming drying speed is fast, the adhesion fastness is good, the gloss of varnish is high, and the cost of thinner solvent is low. In general, the aluminum foil package with high temperature resistance and even because the universal tensile testing machine system is a closed-loop system to 180 ℃, the varnish is composed of modified rosin ester, nitrocellulose or polyamide resin with high softening point, or nitrocellulose plus amino resin. It is also composed of thermoplastic acrylic resin with high softening point and chloroacetic resin. Now high temperature resistant (℃ or even higher glazing oil) aluminum foil packaging glazing oil is composed of thermosetting resin, amphoteric resin and silicone resin. Stabilizers are often introduced to control easy oxides. In order to control the generation of abnormal toxicity, the words o, h, Cl, etc. in resins, solvents, additives and even pigments and dyes are not selected. The theories of oxides are: (1) compounds formed by the combination of elements and oxidation. The oxide mentioned here refers to the ionic or covalent oxide formed by the combination of oxygen with a single atom. In addition, there are peroxides, superoxides, odorous oxides, organic oxides (such as ethylene oxide), etc. the same element can have oxides with different valence states. Such as sulfur dioxide SO2 and sulfur trioxide SO3; Cuprous oxide Cu2O and cuprous oxide CuO are prepared by: ① common oxides can be obtained by burning simple substances or compounds in air or pure oxygen; ② At the temperature of red heat, water vapor oxidizes the simple substance into oxide; ③ Some elements can be oxidized into oxides with nitric acid as oxidant; ④ Dehydration of hydroxide or thermal decomposition of carbonate and nitrate; ⑤ Adding alkali to the salt solvent to remove the precipitated hydroxide or oxide, and then dehydration and drying; ⑥ The oxide with low oxidation state can be obtained by reducing the oxide with high oxidation state with reductant. (2) A compound of metal or nonmetal and oxidation. The same element can have several oxides with different valence. For example, carbon monoxide CO and carbon dioxide CO2 and copper oxide CuO; FeO, Fe2O3 and Fe3O4, etc. Oxides can be divided into acidic oxides, alkaline oxides, amphoteric oxides and inert oxides. In order to achieve firm adhesion, in addition to strictly controlling solubility, hydrogen bonding force, surface tension, boiling point, evaporation rate and evaporation rate, an appropriate amount of wetting additives are introduced into the product system, which is conducive to the affinity between glazing oil and printing ink film. Its purpose is to bypass the technical barriers and realize the scientization and standardization of aluminum foil polish (protective agent)

production process of aluminum foil varnish

raw materials jujube input solvent jujube input resin jujube start up disperse dissolve jujube additives add jujube scrape sample jujube test. Example of the formula of varnish on aluminum foil:

there were 62 cases of varnish on high temperature resistant aluminum foil in 2012 (formula 1). Notes to the test report: 1 The product is produced and used at 160 ℃ and 200 ℃ respectively (see Table 1 for batch coating), of which 2 are comprehensive records); 2. Place: Henan Kaidi medicine bag material Co., Ltd. 3 Time: the morning of June 6, 2004 (the same test date); 4. Test basis: GB; 5. Aluminum foil adopts 0.024 × 140mm plain aluminum foil (PTP); 6. Inspection records of medicinal aluminum foil (see Table 1). Table 1 pharmaceutical test record 1 The measurement of volatile matter is 100mm × 100 mm two tablets 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 evaluation qualified 2 The coating amount difference of glazing oil is measured as 100mm × The difference between the weight of 100 mm five pieces of weighing and polishing oil is the coating amount. Calculate the average value. The difference between the coating amount of each piece and the average value is the coating amount difference index: 12 the use of synchronous sampling technology and digital quantity time correction technology makes the performance of the experimental machine stable and reliable 5% original weight (mg) ① 547.30 ② 546.60 ③ 554.50 ④ 549.45 ⑤ 552.10 remove the glazing weight (mg/m2) ① 531.70 ② 530.80 ③ 538.20 ④ 533.40 ⑤ 535.90 coating amount (g/m2) ① 15.60 ② 15.80 ③ 16.30 ④ 16.05 ⑤ 16.20 average coating amount (g/m2) 15.99 coating amount difference measurement results ① -2.43% ② -1.18% ③ 1.93% ④ 0.37% ⑤ 0.31% qualified heat sealing strength index: ≥ 5.88n/15mm measurement results evaluation 10.10 qualified protective layer heat resistance index: 200 ℃, 0.2MPa no obvious sticking and falling. The evaluation of the measurement results shows that there is no qualified explanation: the author has successively measured the theoretical indicators of easy oxide after drying the delivered high-temperature glazing oil (formula) at ℃ for seconds in Jiangzhou pharmaceutical fine packaging Co., Ltd. of Zhenjiang City, Jiangsu Province. The results are: Formula 1 is 0ml, formula 2 is 0.7ml, formula 3 is 0 ml, formula 4 is 0.8 ml, Formula 5 is 0.7 mL (the above is the difference between the two consumed titrants). In addition, the author uses high-temperature glazing oil and Colorants (dyes, pastes) as general aluminum foil packaging printing ink and high-temperature aluminum foil packaging printing ink

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