Low-temperature leadless porcelain enamel composition and preparation method thereof
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A technology of lead-free enamel and composition, which is applied in the field of enamel materials and preparation, and can solve problems such as plating corrosion, zinc unfavorable enamel adhesion, and low melting point
Inactive Publication Date: 2008-05-21
DONGHUA UNIV
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[0004] At present, the aluminum-zinc-coated steel plate with 55% Al and 45% Zn coating is the most used in production and application. First, combine the characteristics of aluminum-zinc-coated steel plate to design a suitable enamel formula, but must face the following problems: (1) The melting point of the galvanized layer of the aluminum-zinc-coated steel sheet is low. If the firing temperature of the enamel is too high, the coating will be severely eroded during the enamel firing process; (2) The coating of the aluminum-zinc-coated steel sheet contains A certain amount of zinc, found by research, the existence of zinc is not conducive to the adhesion of enamel; (3) In order to prevent lead pollution, it is necessary to develop a kind of enamel that does not contain lead and can be easily fired at low temperature
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Embodiment 1
[0025] Base glaze: SiO 2 31%, TiO 2 20%, Na 2 O 23%, K 2 O 14%, introducing Sb 2 o 3 0.2%, Li 2 O 1.6%, ZrO 2 0.2%, V 2 o 5 10%; the melting temperature is 1250°C, the melting time is 60 minutes, and the glass frit is directly poured into water to quench after melting. The aluminum-zinc-coated steel plate is soaked with 5% citric acid for 2 minutes, then rinsed with water, and dried; weigh 50g of glass frit, and weigh and add grinding materials: 4g of boric acid, 1g of potassium hydroxide, 1g of sodium silicate, 4g of titanium oxide, Pigment 1g; then add 25ml of water, and use a planetary ball mill to mill for 60 minutes; pass the slurry through a 200-mesh sieve, pour the sieved material into the spray gun, and spray evenly on the galvanized substrate, once coated, and dried Firing, the firing temperature is controlled at about 530°C, and the firing time is 2.5 minutes.
Embodiment 2
[0027] Base glaze: SiO 2 35%, TiO 2 22%, Na 2 O 20%, K 2 O 13%, introducing Sb 2 o 3 0.2%, Li 2 O 1.6%, ZrO 2 0.2%, V 2 o 5 8%; the melting temperature is 1250°C, and the melting time is 60 minutes. After melting, directly pour the glass frit into water to quench; the aluminum-zinc steel plate is burned at 600°C for 5 minutes; weigh 50g of glass frit, add it to the mill Additives: boric acid 5g, potassium hydroxide 1g, sodium silicate 1g, titanium oxide 4g, pigment 1g; then add 25ml of water, and use a planetary ball mill to mill for 60min; Pour into the spray gun, spray evenly on the galvanized steel plate, coat once, dry and then fire, the firing temperature is controlled at about 550°C, and the firing time is 2.5 minutes.
[0028] Table 1 shows the test results of the samples of Examples 1 and 2, wherein gloss: in accordance with the provisions of GB11420-89 "Enamel Gloss Test Method"; adhesion strength: in accordance with the provisions of the EU enamel test ...
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Abstract
The invention relates to a low temperature lead-free vitreous enamel component and the preparation. The component includes (a) basic glaze: 25-40 portions of SiO2, 17-30 portions of TiO2, 15-25 potions of Na2O, 5-20 portions of K2O. In addition, 0.1-0.5 portions Sb2O3, 0.1-3 portions of Li2O, 0.1-0.5 portions of ZrO2 and 5-15 portions of V2O5 are induced. The preparation includes: firstly, the components are weighted according to a glaze formula and melted in a high temperature furnace after being mixed. The melting temperature is 1250-1350 degree Celsius, and the melting time is 60 plus or minus 5min. materials coming out from the furnace when the melting is finished are directly poured in water for the quenching; secondly, the melted basic glaze materials are added with mill addition in proportion and water, and are milled in a planetary ball mill for 60-70min to be 200 orders; thirdly, slurry after ball milling is evenly distributed on a clean steel plate covered with aluminum and zinc and is burned for 2-3min at about 550-580 degree Celsius. The invention has the advantages of lead pollution-free, good adherence, uneasy abscission of enamel, gloss surface, simple preparation technology, low cost and easy expansion.
Description
technical field [0001] The invention belongs to the field of enamel materials and its preparation, in particular to a low-temperature lead-free enamel composition and its preparation. Background technique [0002] Zinc-aluminum alloys have higher stability than single aluminum or galvanized coatings in corrosive environments. For example, 55% Al and 45% Zn hot-dip coatings combine the advantages of single aluminum and single zinc coatings in preventing low-temperature liquid corrosion and high-temperature oxidation. respective advantages. As a new type of anti-corrosion material, zinc-aluminum alloy is mainly used for the coating of metal surfaces. It is mass-produced in industry and has a wide range of applications, such as solar water heaters, electromechanical, electrical appliances, building materials, automobiles and furniture. [0003] Due to the low firing temperature (less than 600°C), aluminum-zinc-coated steel plate enamel belongs to low-temperature enamel. Its pr...
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