CN1040570A - Preparation method of lead-free glass glaze - Google Patents

Abstract

The invention discloses a preparation method of a novel lead-free glass glaze. The lead-free glass glaze is formulated based on 50-80% broken glass and 10-50% prefabricated frit glaze. The preparation process is to use a ceramic mill to grind the lead-free glaze ingredients into dry powder. Add 30-50% water to make glaze slurry. The glaze slurry is applied on the blank, and after drying, it can be made into colorful colored glaze products such as peacock blue, yellow, green, purple, black and other glazes through firing process. By adopting the formula of the invention, not only there is no harm of lead poisoning to the human body in the production process, but also the production cost can be significantly reduced.

Description

The invention relates to the technical field of lead-free glazed glaze products, in particular, the invention relates to a method for preparing lead-free glazed glaze by using cullet and prefabricated frit glaze as main raw materials.

Glass products are a kind of traditional high-grade roof and wall building decoration materials in my country. They are mainly used in some classical buildings, gardens and modern antique buildings in my country, making them have high artistic appreciation value.

The history of producing glazed products in our country has been 700 years. There are two main methods of preparing glazed products. One is that the glazed products factories in northern my country mostly use the traditional high-lead glaze formula. The preparation method generally uses two firings. Technology, glaze firing temperature is low, generally 750 ~ 900 ℃. The existing problem is that the lead poisoning produced in the production process seriously endangers the health of workers. The other is that the glass products factories in the south of our country often use low-lead or lead-free glaze formulas. The preparation method is to prefabricate all raw materials into fritted glazes. Generally, one-time firing is used, and the firing temperature is 1100-1200°C. . This kind of firing temperature is relatively high, so it is not suitable for the firing conditions used by some Liuli factories in northern my country.

It is the purpose of the present invention to adopt cheap cullet as the main raw material, and the lead-free glass glaze prepared is suitable for the firing conditions adopted by the glass factories in the south and the north of my country at the same time.

The concrete method that realizes the present invention is:

First prepare the prefabricated frit glaze of the lead-free glass glaze of the present invention, the formula of the frit glaze is: 30-50% of quartz sand; 30-50% of soda ash, and 0-30% of borax. The melting process is as follows: use gas, natural gas or diesel as fuel in a glass tank kiln to melt into prefabricated frit glaze under the condition of 1300-1400 °C.

Preparation of lead-free glass glaze products

The formula of lead-free glass glaze is: broken glass 50-80%; prefabricated frit glaze 10-50%; kaolin 1-10%; quartz sand 0-10%; spodumene 0-10%; Copper, iron oxide, cobalt oxide, manganese oxide, chromium oxide) 1-15%, glaze modifier (such as water glass, magnesium chloride, dextrin) 0.1-1%.

The preparation process is as follows: use a ceramic mill to grind the lead-free glaze ingredients of the present invention into dry powder, so that the fineness reaches the standard of cement (0.08mm square hole sieve residue is less than 7%). Then add 30-50% tap water to the glaze powder to make a glaze slurry. The glaze slurry can be applied to the green body by pouring, dipping and spraying methods, and then dried.

The firing process of this lead-free glass glaze product can be fired in various types of ceramic kilns using diesel oil, firewood and coal as fuel. The firing temperature can be arbitrarily selected within the range of 850-1200°C by changing the glaze formula. Generally speaking, a higher firing temperature (1100-1200°C) is required when the one-time firing process of blank and glaze is used. When using the double-firing process of blank and glaze, a lower glaze firing temperature of 850-950°C can be used. For each selected glaze formulation, the firing temperature range is 50-60°C.

By adopting the lead-free glaze of the invention, the harm of lead poisoning to workers' health is completely avoided in the production process of glazed products. The raw material cost of this lead-free glaze is about 25% of that of high-lead glaze, and the source of raw materials is extensive, and the preparation process is simple. The lead-free glazed glaze of the invention can be used to make colorful colored glazed glazed products such as peacock orchid, yellow, green, purple and black.

Claims (3)

1, a preparation method of lead-free glazed glaze, is characterized in that the formula of this lead-free glazed glaze is: Broken glass 50-80%; Prefabricated frit glaze 10-50%; Kaolin 1～10%; Quartz sand 0～10%; Spodumene 0～10%; Colorants (such as copper oxide, iron oxide, cobalt oxide, manganese oxide, chromium oxide) 1 to 15%; Glaze modifier (such as water glass, magnesium chloride: dextrin) 0.1～1% 2. The prefabricated frit glaze according to claim 1, characterized in that the formula of the frit glaze is: 30-50% of quartz sand, 30-50% of soda ash, and 0-30% of borax. The melting temperature of the frit glaze is 1300-1400°C. 3. The preparation method of lead-free glazed glaze according to claim 1, characterized in that the lead-free glaze ingredients are ground into glaze powder by dry grinding method, and then 30-50% of tap water is added to prepare glaze slurry.