TWI458693B - A method for producing a high strength porous substrate using liquid crystal glass powder - Google Patents

Description

Method for producing high-strength porous substrate by using liquid crystal glass powder

The invention relates to a method for preparing a high-strength porous substrate by using liquid crystal containing glass powder, in particular to adding liquid crystal glass powder into the clay, and forming a liquid crystal in the sintering process to form a liquid crystal in the substrate. High strength porous substrate manufacturing method for pores.

Liquid crystal displays are widely used by the public at present, but with the gradual popularization of liquid crystal displays, they also face the disposal of discarded liquid crystal displays, and the discarded liquid crystal displays are the most difficult to handle in addition to electronic components.

The Republic of China Invention Patent Publication No. I226315 proposes a "recovery method for a liquid crystal display panel glass". The steps of the method are as follows: (a) First, the face glass on the discarded liquid crystal display is removed and ground. (b) using high temperature to evaporate the liquid crystal adhered to the glass frit to vapor, and to remove the liquid crystal in a vapor state by hot air, wherein the hot air is opposite to the path of the glass frit, and then the vapor is burned at a higher temperature. The liquid crystal in the state is carbon dioxide and water, and the liquid crystal is separated from the glass frit to obtain a glass raw material; (C) Finally, the obtained glass raw material is collected and recovered.

However, there are usually many process attachments or other additives on the liquid crystal glass, such as indium tin oxide (ITO). Therefore, it is impossible to obtain a glass powder with high purity by this method, and the subsequent use is limited, and the glass powder is further processed. Need to spend a lot Manufacturing costs.

In addition, it is to be noted that ceramic porous products have many different kinds of products on the market, and the inventors have proposed that the use of adding waste liquid crystal glass powder to ceramics for ceramic production can save the amount of clay used and reduce the sintering temperature. And the liquid crystal glass leaves pores after sintering, so that the porosity of the ceramic product is increased and the permeability is better, so a new way of recycling the waste liquid crystal glass is given.

In order to apply liquid crystal glass to a wider range of ceramic porous products, the inventors of the present invention have proposed to study when adding liquid crystal glass powders of different amounts and different powder average particle sizes to clay, after sintering. What is the effect of the porous substrate, and it is found that the addition of a specific proportion and a specific average particle diameter of the liquid crystal glass powder to the clay can improve the bending strength of the porous substrate after sintering (BENDING STRENGTH), making the porous Substrate applications are more extensive.

Accordingly, the main object of the present invention is to provide a liquid crystal glass added to a clay, which is vaporized in a sintering process to form a high-strength porous structure of the sintered substrate, thereby being used as a recycled waste liquid crystal glass. A method of treating the same, and providing a novel method of making a porous ceramic substrate.

Based on the above objects, the inventors have developed a method for producing a high-strength porous substrate using liquid crystal containing glass powder in accordance with the spirit of continuous innovation and research, and the steps include: A. After the liquid crystal glass of 10% to 50% by weight is ground into a powder, it is added to the clay to form a mixture; B. After pretreating the mixture, forming into a green embryo, and then drying the green embryo Processing; C. sintering the dried green embryo into a base The liquid crystal and the low melting point component of the liquid crystal glass in the liquid crystal glass are volatilized during sintering, and a plurality of pores are formed in the substrate.

Further, in the step A, the liquid crystal glass is ground into powders of different particle diameters, and the weight percentage is 10%, 20%, 30% or 40%, and the average particle diameter is 40 micrometers, 105 micrometers, 297 micrometers or 597 micron liquid crystal glass powder is added to the white clay.

Further, the pretreatment of step B includes stirring and mixing, and the green forming method includes any one of molding, casting or extrusion.

Further, the sintering temperature of the step C is between 1000 ° C and 1200 ° C, and the holding temperature of the sintering process is between 10 minutes and 120 minutes.

The main effects of the present invention are:

1. Recyclable glass containing liquid crystal, such as liquid crystal glass scrap or LCD screen, can reduce the raw material cost of the product.

2. The liquid crystal glass powder is added to the clay, and the liquid crystal is completely vaporized and decomposed by high-temperature sintering, and pores are generated. The disposal of the waste liquid crystal glass business waste is safe and reliable, and there is no environmental dispute.

3. Adding liquid crystal glass to clay can not only reduce the sintering temperature, but also obtain better strength. At the same time, it can improve the gas permeability and heat insulation effect of the porous structure. After proper condition control, it can absorb or penetrate by capillary adsorption. The effect is very suitable as a kind of adjustable wet green building material.

The first figure is a flow chart of the present invention.

The second figure is an electron micrograph of the substrate after sintering of the present invention.

The third graph is a graph showing the sintering time and substrate strength of a liquid crystal glass having a weight percentage of 10% added in the process of the present invention.

The fourth graph is a graph showing the sintering time and substrate strength of a liquid crystal glass having a weight percentage of 20% added in the process of the present invention.

The fifth figure is a graph showing the sintering time and substrate strength of a liquid crystal glass having a weight percentage of 30% added in the process of the present invention.

The sixth figure is a graph showing the sintering time and substrate strength of a liquid crystal glass having a weight percentage of 40% added in the process of the present invention.

Combining the above technical features, the main effects of the present invention will be clearly shown in the following embodiments.

Please refer to the first figure, which is a method for fabricating a high-strength porous substrate using liquid crystal containing glass powder, and the steps include:

A. The liquid crystal glass having a weight percentage of 10% to 50% is ground into powders of different particle diameters, and then added to the clay to form a mixture. In the present embodiment, the weight percentage is 10%, 20%, 30% and 40% of the liquid crystal glass is ground into powders having an average particle diameter of 40 μm, 105 μm, 297 μm and 597 μm and added to the clay, wherein the source of the liquid crystal glass is preferably a waste liquid crystal display, which can reduce the raw material cost of the product.

B. After the mixture is pretreated, it is formed into a single embryo, and the raw embryo is subjected to dry drying or drying, wherein the pretreatment includes stirring and mixing, and the green forming method includes molding, casting or Extrusion of any one, while stirring and mixing, to And the subsequent molding method is like the general ceramic product process, so it will not be described.

C. The sintering temperature is between 1000 ° C and 1200 ° C, and the holding temperature of the sintering process is within 10 minutes to 120 minutes, and the dried green embryo is sintered into a substrate, the liquid crystal in the liquid crystal glass and The low melting point component of the liquid crystal glass [such as B2O3 (boron oxide), etc.] and volatilizes during the sintering process, and a plurality of pores are formed in the substrate to make the substrate into a porous structure, and the liquid crystal is completely vaporized and decomposed by high temperature sintering. The disposal of waste LCD glass business waste is safe and reliable, and there is no environmental dispute.

Referring to the second figure, the electron micrograph of the substrate after sintering is further explained, the melting point of the liquid crystal glass is between 1000 ° C and 1200 ° C, so the liquid crystal glass is added during the sintering process. The sintering temperature can be lowered, and the liquid crystal glass will partially melt. The molten liquid crystal glass will help the sintering to improve the strength, so that the sintered substrate becomes a high-strength porous structure, and since the liquid crystal glass is not completely melted, it will not Excessive expansion and even filling of the required porous structure to affect its required functionality (breathable, permeable, humidity-regulating), so the sintered substrate can be used as a filter material, a smart basin or adjustable The use of wet green building materials.

Referring again to the third to sixth figures, for different weight percentages of liquid crystal glass, the sintering time of the body is the substrate and the strength of the substrate under different average particle diameter conditions, wherein When a liquid crystal glass powder having a weight percentage of 10% and an average particle diameter of 40 μm is added to the clay, and sintered at 1200 ° C, the substrate of the maximum strength can be obtained, and the strength value can reach 50 MPa, which is about no more than no addition. The base material (intensity of about 21.5 MPa) sintered by white clay of liquid crystal glass powder is increased by 150%; when 30% by weight is added, and the average particle diameter is 297 micrometers or 105 micrometers In the liquid crystal glass powder to the white clay, after the sintering, the substrate can still retain the strength value similar to that of the substrate sintered without the addition of the liquid crystal glass powder; when the weight percentage is 10%, and the average particle diameter is 40 μm In the liquid crystal glass powder to the white clay, the sintering temperature can be lowered to 1100 ° C, and the strength value similar to that of the substrate sintered without the addition of the liquid crystal glass powder can be maintained.

Claims (8)

A method for producing a high-strength porous substrate by using a liquid crystal containing glass powder, the steps comprising: A. grinding a liquid crystal glass having a weight percentage of 10% to 50% into a powder of different particle diameters, wherein the average particle diameter is 40 μm, 105 One of micron, 297 micron or 597 micron, and then added to the clay to form a mixture; B. pre-treating the mixture to form a green embryo, and then applying the green embryo to a drying process; C. drying the mixture The subsequent green embryo is sintered into a substrate, and the low melting point components of the liquid crystal and the liquid crystal glass in the liquid crystal glass are volatilized during sintering, and a plurality of pores are formed in the substrate. The method for producing a high-strength porous substrate using liquid crystal containing glass powder as described in claim 1, in the step A, the weight percentage is 10%, and the average particle diameter is 40 μm, 105 μm, 297 A liquid crystal glass powder of one of micrometers or 597 micrometers is added to the white clay. The method for producing a high-strength porous substrate by using liquid crystal containing glass powder as described in claim 1, in the step A, the weight percentage is 20%, and the average particle diameter is 40 μm, 105 μm, 297 A liquid crystal glass powder of one of micrometers or 597 micrometers is added to the white clay. The method for producing a high-strength porous substrate using liquid crystal containing glass powder as described in claim 1, in the step A, the weight percentage is 30%, and the average particle diameter is 40 μm, 105 μm, 297 Liquid crystal glass of one of micron or 597 micron The glass powder is added to the white clay. The method for producing a high-strength porous substrate using liquid crystal containing glass powder as described in claim 1, in the step A, the weight percentage is 40%, and the average particle diameter is 40 μm, 105 μm, 297 A liquid crystal glass powder of one of micrometers or 597 micrometers is added to the white clay. A method for producing a high-strength porous substrate using liquid crystal-containing glass powder as described in claim 1, wherein the pretreatment of step B comprises stirring and mixing. A method for producing a high-strength porous substrate by using a liquid crystal containing glass powder according to the sixth aspect of the invention, wherein the raw preform forming method of the step B comprises any one of molding, casting or extrusion. The method for producing a high-strength porous substrate by using liquid crystal containing glass powder according to claim 1, wherein the sintering temperature of the step C is between 1000 ° C and 1200 ° C, and the holding temperature of the sintering process is 10 minutes. Between 120 minutes.