WO2020032388A1 - Method for producing synthetic anorthite having infrared reflective properties, and fabric or clothing utilizing same - Google Patents

Abstract

The present invention discloses a method for producing white synthetic anorthite particles having an average particle size of 0.1-3 µm and a whiteness of at least 90, the method comprising: a step in which a calcium carbonate powder having a whiteness of at least 80, a purity of at least 99%, and an average particle size of 2-4 µm and selected from the group consisting of calcium carbonates, calcium hydroxides, calcium oxalates, calcium oxides, dolomites, and lead limes, an aluminum oxide powder having a whiteness of at least 90, a purity of at least 99%, and an average particle size of 4-6 µm and selected from the group consisting of aluminum hydroxides, aluminum oxides, aluminum nitrates, aluminum chlorides, aluminum sulfates, aluminum acetates, and commercially available aluminum, and a silica having a whiteness of at least 90, a purity of at least 99%, and an average particle size of 1-3 µm and selected from the group consisting of tetramethyl silicates, tetraethyl silicates, tetrapropyl silicates, tetraisopropyl silicates, ethyl silicate polymers, sodium silicates, potassium silicates, fumed silicas, and precipitated silicas are sequentially put into a dry attrition mill containing zirconia beads, in an amount constituting 70% or less of the attrition mill capacity, and are stirred to obtain a mixed raw material having a composition of CaO:Al₂O₃:SiO₂ = 1:1.1:1.1-1:2.1:2.1; a step for removing the mixed raw material and transferring same to a heat treatment sagger, and then charging the sagger into a heat treatment furnace to perform a heat treatment; and a step for cooling the mixed raw material to room temperature in the furnace after the heat treatment and removing a synthetic anorthite from the sagger. Accordingly, the synthetic anorthite (CaAl₂Si₂O₈) particles have infrared reflective properties, and can thus effectively reflect infrared rays among the energy rays emitted from sunlight and solve various problems such as the occurrence of the heat-island phenomena caused by infrared rays and infrared ray-induced ambient temperature increases.

Description

Method for preparing synthetic feldspar having infrared reflecting properties and fabric or clothing using the same

The present invention is a synthetic ileite having an infrared reflectivity and a fabric, a fabric material using the same. It relates to fibers, clothing, films and the like.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic anorthite having infrared reflectivity, and more particularly, to a fabric and clothing having an infrared reflecting property using a synthetic feldspar synthesis method and a synthetic ileite thus designed. .

Electromagnetic waves emitted from sunlight and reaching the earth's surface can be classified into ultraviolet rays, visible rays, and infrared rays. Among these, infrared is called 'heating wire'. In other words, due to the strong heat rays radiated from sunlight, the temperature rises especially in summer, affecting our lives a lot. In addition, energy consumption is increasing rapidly due to the rise of the surface temperature due to 'heating wire', the occurrence of urban heat-island and the full operation of the air conditioner. As a prior art to solve this problem can be largely divided into two techniques.

That is, as a method of shielding infrared rays (heat rays), firstly, a shielding technology using infrared reflecting properties and a second shielding technology using infrared absorbing properties.

The first example of shielding technology using infrared reflectance is 'Low-E-glass', which is made of silver (Ag), which is a noble metal, deposited on glass to have 'infrared reflectivity' through a thin Ag metal film. . However, in the case of low-E glass, it is difficult to manufacture, such as the use of a large-capacity deposition equipment, expensive Ag Target, etc. during manufacturing, and has a disadvantage of very high manufacturing cost.

The second example of 'shielding technology using infrared absorbing properties' is a transparent film by depositing and coating colored ultrafine metal oxides such as ITO (Indium Tin Oxide), ATO (Antimony Tin Oxide) and CTO (Cesium Tungsten Oxide). 'Heat-shielded transparent film' manufactured above.

However, in the case of 'heat-blocking transparent film' using colored ultra-fine metal oxides, the film itself has a disadvantage of color, and ITO, ATO, CTO, etc. do not use 'heat-ray' reflecting characteristics, but infrared absorbing properties. Because it uses a certain amount of heat, because the heat capacity is small, rather the 'infrared' part is getting hotter, there are a number of disadvantages. In addition, a rare metal such as indium or the like or an element harmful to humans such as antimony or tungsten is used. In addition, in terms of procurement of raw materials, there are many difficulties, such as having to import from overseas as a resource that does not exist in Korea.

On the other hand, as the shielding technology having infrared reflecting properties or infrared absorbing properties, since the material itself has a colored color, it is very difficult to apply it to fabrics or clothes due to the change of color to produce a thermal fabric or a thermal garment In order to develop a white material having infrared reflectivity, it is necessary.

An object of the present invention is to synthesize a synthetic feldspar having a color of white and infrared reflective properties other than conventional colored metal oxides such as ITO, ATO, CTO having infrared absorbing properties.

It is also an object of the present invention to provide a thermosensitive fabric or a thermosensitive clothing having infrared reflective properties by applying the synthetic feldspar to the fabric and clothing.

The manufacturing method of the white synthetic feldspar particle of this invention,

 Calcium carbonate powder having a whiteness of 80 or more selected from the group consisting of calcium carbonate, calcium hydroxide, calcium oxalate, calcium oxide, dolomite, and sintered lime, with a purity of 99% or more and an average particle diameter of 2 to 4 µm;

Aluminum oxide powder having a whiteness of at least 90, a purity of at least 99%, and an average particle diameter of 4 to 6 µm, selected from the group consisting of aluminum hydroxide, aluminum oxide, aluminum nitrate, aluminum chloride, aluminum sulfate, aluminum acetate, and aluminum acetate,

Tetramethylsilicate, tetraethylsilicate, tetrapropylsilicate, tetraisopropyl silicate, ethyl silicate polymer, sodium silicate, potassium silicate, fumed silica, and precipitated silica have a whiteness of 90 or more, purity of 99% or more In addition, each of the zirconia beads contained within 70% of the attrition mill capacity so that silica having an average particle diameter of 1 to 3 µm was composed of CaO: Al ₂ O ₃ : SiO ₂ = 1: 1.1: 1.1 to 1: 2.1: 2.1. Adding to the attrition mill in order to stir;

Removing the mixed raw material and transferring it to a heat treatment sagger, and then charging the sagger into a heat treatment furnace to heat treatment; and

And cooling down to room temperature after the heat treatment to obtain a synthesized feldspar from Sagger. The synthetic feldspar particles are characterized in that the average particle diameter of 0.1 ~ 3㎛, whiteness of 90 or more.

On the other hand, the synthetic feldspar particles of the present invention has CaO: Al ₂ O ₃ : SiO ₂ = 1: 1.1: 1.1 ~ 1: 2.1: 2.1, characterized in that the infrared reflectance is 50% or more within the wavelength 800nm ~ 3200nm. .

The particles are characterized by having an average particle diameter of 0.1 to 3 ㎛, specific surface area of 2 to 30 m 2 / g. And whiteness is characterized by more than 90.

On the other hand, the present invention is characterized in that for producing a fabric and clothing coating composition having an infrared reflecting properties containing 1 to 50% by weight of the synthetic feldspar particles.

In addition, the composition for the textile and clothing coating of the present invention is 1 to 50% by weight of synthetic feldspar particles, 20 to 30% by weight of polyurethane, 5 to 10% by weight of diethylene glycol, 0.1 to 1% by weight of polyethylene oxide, 0.1 emulsifier dispersant 3 wt%.

The composition is characterized in that the infrared reflectance of 50% or more within the wavelength 800nm to 3200nm. In addition, the fabric and clothing coating composition has an infrared reflecting property that lowers the temperature of the fabric and clothing at 1 ℃ or more when irradiated with infrared light.

In another aspect, the present invention is characterized by producing a fabric, clothing, or film having an infrared reflecting properties by coating the composition.

The fabric material is characterized in that the curtain, blinds, tents, sleeping bags, awning or nonwoven fabric. In addition, as long as the coating composition of the present invention can be coated as well as the fabric, fabric, clothing, as well as a film such as polyethylene terephthalate can be used as the substrate.

On the other hand, the present invention can produce a mixed compound of the 1 ~ 50% by weight of the synthetic feldspar particles and PE resin. It is possible to produce a sheet of the air cap structure from the compound compound of the synthetic feldspar particles and PE resin, the air cap insulation sheet has an insulating effect and infrared reflecting properties.

According to the manufacturing method of the present invention, it is possible to synthesize a synthetic feldspar having a color of white and infrared reflecting properties other than conventional colored metal oxides such as ITO, ATO, and CTO having infrared absorbing properties.

In addition, low-E glass using an existing expensive silver deposition film having an 'infrared reflecting property' or a colored metal oxide particle having an 'infrared absorbing property' is difficult to apply to fabrics, fabrics, textiles, clothing, and films. By coating a 'composition using synthetic feldspar' having an infrared reflecting property directly to the back, a thermosensitive fabric, a thermal garment or a film having infrared reflecting properties can be prepared.

1 is FE-SEM of the synthetic feldspar particles according to the present invention,

2 is an X-ray diffraction diagram of the synthetic feldspar particle according to the present invention,

3 is an infrared reflection characteristic diagram of synthetic feldspar particles according to the present invention,

Figure 4 is a result of the measurement of the temperature difference before and after treatment for the garment treated with synthetic feldspar particles according to the present invention.

In order to achieve the above object, the inventors of the present invention have focused on the fact that a crystalline metal oxide-based material composed of CaO, Al ₂ O ₃ , and SiO ₂ exhibit infrared reflecting properties, and as a result, have invented various methods.

A crystalline metal oxide-based material containing CaO, Al ₂ O ₃ , and SiO ₂ elements. Anorthite, which is a kind of mineral, generally belongs to the classification of feldspar, has a tetragonal crystal structure, and as a unit cell, a = 8.1768 ms, b = 12.8768 ms, and c = 14.169 ms. The structural formula was CaAl ₂ Si ₂ O ₈ .

However, in the case of feldspar, which is a natural mineral, many impurities such as Fe ₂ O ₃ , Na ₂ O, and K ₂ O are mixed in the crystal structure, and thus the possibility of industrial application is very low. Accordingly, the present inventors have recognized that industrial applicability is high by synthesizing a material having a feldspar composition, and thus, the inventors have conducted research on the synthesis method and the applicability of a synthetic feldspar having infrared reflecting properties. Synthesis of Synthetic Synthetic Stone having ₂ O ₃ : SiO ₂ = 1: 2: 2 (molar ratio) and Synthetic Synthetic Synthetic Synthetic 1 to 50 wt%, 20 to 30 wt% Polyurethane, 30 to Organic Solvent Disclosed is a textile and clothing coating composition having infrared reflecting properties consisting of 40% by weight, 1 to 3% by weight of diethylene glycol, 0.1 to 1% by weight of polyethylene oxide, 0.1 to 3% by weight of an emol dispersant.

EMBODIMENT OF THE INVENTION Below, this invention is demonstrated in detail.

Synthesis of ileite with infrared reflective properties

In synthesizing the feldspar having infrared reflectivity, calcium oxide (CaO) as a constituent may be used as a raw material such as calcium carbonate, calcium hydroxide, calcium oxalate, calcium oxide, dolomite, and lead lime. In consideration of handling in the synthesis step and the like, it is most preferable to use calcium carbonate.

As the aluminum oxide (Al ₂ O ₃ ) component, aluminum hydroxide, aluminum oxide, aluminum nitrate, aluminum chloride, aluminum sulfate, aluminum acetate, aluminum nitrate, and the like may be used. Most preferred.

As the silica (SiO ₂ ) component, tetramethyl silicate, tetraethyl silicate, tetrapropyl silicate, tetraisopropyl silicate, ethyl silicate polymer, sodium silicate, potassium silicate, fumed silica, precipitated silica and the like can be used. Preferably silica is used. However, it is not limited to the raw materials exemplified above.

Example 1 Grinding and Homogeneous Mixing of Raw Materials

CaO: Al ₂ O ₃ : SiO ₂ = 1: 2: 2 (molar ratio) A calcium carbonate powder 100g (1 mole), whiteness of 80 or more, purity of 99.5%, average particle size of 3.5 μm, whiteness of 90 203.8 g (2 mole) of aluminum oxide powder having a purity of 99.9% and an average particle diameter of 5.1 µm, and 120 g (2 mole) of silica having a purity of 99.95% and an average particle diameter of 90 µm or more, respectively, at 90% or more. Weigh and weigh the zirconia beads into a 3-liter dry attrition mill containing 70% of the capacity of the attrition mill, and stir for 30 minutes in the attrition mill to achieve good grinding and uniform mixing. At this time, it is preferable to operate the mill after connecting the cooling water so that the temperature inside the attrition mill does not rise.

1) Heat treatment process of mixed raw materials

Then, the mixed raw material is removed from the attrition mill and transferred to the heat treatment sagger. The sagger containing the mixed raw materials is charged into a heat treatment furnace and heat treated. Heat treatment of the mixed raw material is performed at 1300 ° C. for about 12 hours, and then cooled to room temperature to remove the synthesized feldspar from Sagger. Thus obtained synthetic feldspar particles had an average particle diameter of 2.5 µm and a whiteness of 90 or more white powder.

2) Analysis of synthesized ileite

The powder obtained from Sagger was identified by using a powder X-ray diffractometer, and it was found that it was ileite, and its XRD data is shown in FIG. 2. In addition, the reflectance in the infrared region was measured by analyzing the UV-VIS Spectrophotometer. The results are shown in FIG.

3) Preparation of a composition for manufacturing fabrics and clothes having infrared reflective properties using synthetic feldspar

30% by weight of polyurethane resin for clothes having moisture permeability and moisture proof function, 4% by weight of synthetic feldspar powder, 30% by weight of methyl ethyl ketone solvent, 0.1% by weight of nonionic surfactant to improve dispersibility of hapse feldspar powder After weighing each and mixing in order, it continued working for 30 minutes continuously under the pressure of 2.0-5.0 kg / cm <2> using a three roll mill. Preferably, the pressure of the three roll mill was advanced in the range of 2.5 to 3.0 kg / cm 2. When the pressure of the three roll mill is 2.0kg / ㎠ or less, the dispersion of the ileum stone powder is not properly achieved, and when it is 5.0 kg / ㎠ or more, the ileum stone powder is pulverized so small that the viscosity of the coating composition increases a lot, It was difficult to coat clothing.

4) Evaluation of the Infrared Reflective Properties of Sunlight after Coating on Fabrics or Clothing

After preparing the composition to cope with the feldspar having infrared reflecting properties, the composition was coated on a white fabric using an applicator, then placed in a convection dryer and dried for 1 hour, and then coated fabric The temperature of the coated fabric was checked by changing the temperature with sunlight, and the surface temperature of the coated fabric was about 2 ~ 4 ℃ lower than that of the untreated standard sample. A summary of these experiments is shown in FIG. 4.

5) Preparation of mixed compound of synthetic feldspar and PE resin

 A compound was prepared by mixing 30% by weight of polyethylene resin and 4% by weight of synthetic feldspar powder.

6) Manufacture air cap sheet from mixed compound of synthetic feldspar and PE resin

 An air cap structure sheet was prepared from the mixed compound of the synthetic feldspar and the PE resin. The air cap sheet prepared from the mixed compound has infrared reflecting properties, and exhibited thermal insulation with a thermal conductivity of less than 0.1 W / m · K.

Example 2 Grinding and Homogeneous Mixing of Raw Materials

CaO: Al ₂ O ₃ : SiO ₂ = 1: 2.2: 2.2 (molar ratio) The whiteness is 80 or more, the purity is 99.5%, the average particle size of the calcium carbonate powder 100g (1mole), the whiteness is 90 or more , 224.18 g (2.2 mole) of aluminum oxide powder having a purity of 99.9% and an average particle diameter of 5.1 μm, weighing 132 g (2.2 mole) of silica having a whiteness of more than 90%, a purity of 99.95%, and an average particle diameter of 2.5 μm, respectively, Zirconia beads are sequentially added to a 3-liter dry attrition mill containing 70% of the attrition mill capacity and stirred for 30 minutes in the attrition mill to facilitate grinding and uniform mixing. At this time, preferably, the mill is operated after connecting the cooling water so that the temperature inside the attrition mill does not rise.

1) Heat treatment process of mixed raw materials

After that, the mixed raw material is removed from the attrition mill and transferred to the heat treatment sagger. The sagger containing the mixed raw materials is charged into a heat treatment furnace and then heat treated. Heat treatment of the mixed raw material is performed at 1300 ° C. for about 12 hours, and then cooled to room temperature to remove the synthesized feldspar from Sagger. Thus obtained synthetic feldspar particles had an average particle diameter of 3.0 µm and a whiteness of 93 or more white powder. Since the process was carried out in the same manner as in Example 1.

Example 3 Grinding and Homogeneous Mixing of Raw Materials

CaO: Al ₂ O ₃ : SiO ₂ = 1: 1.98: 1.98 (molar ratio) Calcium carbonate powder 100g (1mole) with whiteness over 80, purity 99.5%, average particle size 3.5um, over white 90 Weighing 201.762 g (1.98 mole) of aluminum oxide powder with a purity of 99.9% and an average particle diameter of 5.1um, weighing 118.8g (1.98mole) of silica with a purity of 99.95% and an average particle diameter of more than 90%, respectively The zirconia beads are then sequentially added to a 3-liter dry attrition mill containing 70% of the attrition mill's capacity and stirred for 30 minutes in the attrition mill to achieve good grinding and uniform mixing. At this time, preferably, the mill is operated after connecting the cooling water so that the temperature inside the attrition mill does not rise.

1) Heat treatment process of mixed raw materials

After that, the mixed raw material is removed from the attrition mill and transferred to the heat treatment sagger. The sagger containing the mixed raw material is charged into a heat treatment furnace and then heat treated. Heat treatment of the mixed raw material is performed at 1300 ° C. for about 12 hours, and then cooled to room temperature to remove the synthesized feldspar from Sagger. Thus obtained synthetic feldspar particles had an average particle diameter of 1.5 µm and a whiteness of 95 or more white powder. Since the process was carried out in the same manner as in Example 1.

Comparative Example 1. Grinding of natural feldspar powder

The feldspar powder, a natural mineral having an average particle size of 10 µm and a whiteness of 70 or less, was pulverized in a ball mill to adjust the average particle size to 3 µm to obtain a natural feldspar powder. In the case of the natural feldspar powder obtained in this way, the whiteness is too low to cause stains when coating on white clothes and light fabrics, and to darken the overall color of the clothes and fabrics, and to apply them to clothes and fabrics. Was difficult.

Claims (12)

1. Calcium carbonate powder having a whiteness of 80 or more selected from the group consisting of calcium carbonate, calcium hydroxide, calcium oxalate, calcium oxide, dolomite, and sintered lime, with a purity of 99% or more and an average particle diameter of 2 to 4 µm;

   Aluminum oxide powder having a whiteness of at least 90, a purity of at least 99%, and an average particle diameter of 4 to 6 µm, selected from the group consisting of aluminum hydroxide, aluminum oxide, aluminum nitrate, aluminum chloride, aluminum sulfate, aluminum acetate, and aluminum acetate,

   Tetramethyl silicate, tetraethyl silicate, tetrapropyl silicate, tetraisopropyl silicate, ethyl silicate polymer, sodium silicate, potassium silicate, fumed silica, and precipitated silica are 90 or more, purity of 99% or more In addition, each of the zirconia beads contained within 70% of the Attrition Mill capacity so that silica having an average particle diameter of 1 to 3 µm was composed of CaO: Al ₂ O ₃ : SiO ₂ = 1: 1.1: 1.1 to 1: 2.1: 2.1. Adding to the attrition mill in order to stir;

   Removing the mixed raw material and transferring it to a heat treatment sagger, and then charging the sagger into a heat treatment furnace to heat treatment; and

   Method of producing a synthetic feldspar particles having a mean particle size of 0.1 ~ 3㎛, whiteness of 90 or more, including the step of obtaining by cooling the room temperature after the heat treatment to synthesized feldspar from Sagger.
2. Synthetic feldspar particles having CaO: Al ₂ O ₃ : SiO ₂ = 1: 1.1: 1.1 to 1: 2.1: 2.1, and having an infrared reflectance of 50% or more within a wavelength of 800 nm to 3200 nm.
3. The synthetic feldspar particle according to claim 2, which has an average particle diameter of 0.1 to 3 m and a specific surface area of 2 to 30 m 2 / g.
4. The white synthetic feldspar particle according to claim 2, wherein the whiteness is 90 or more.
5. The composition for coating fabrics and clothing having an infrared reflecting property comprising 1 to 50% by weight of the synthetic feldspar particles of any one of claims 2 to 4.
6. The method according to claim 5, wherein 1 to 50% by weight of synthetic feldspar particles, 20 to 30% by weight of polyurethane, 5 to 10% by weight of diethylene glycol, 0.1 to 1% by weight of polyethylene oxide, and 0.1 to 3% by weight of an emulsifier dispersant. Fabric and clothing coating composition having an infrared reflecting properties comprising.
7. The composition of claim 5, wherein the composition has an infrared reflectance of 50% or more within a wavelength of 800 nm to 3200 nm.
8. The method of claim 5,

   A composition for coating fabrics and clothes having infrared reflecting properties that reduce the temperature of the fabric and clothes by 1 ° C. or more upon irradiation with infrared light.
9. A fabric, textile material, clothing or film having infrared reflective properties coated with the composition of claim 5.
10. 10. The fabric, fabric, clothing or film having infrared reflecting properties of claim 9, wherein the fabric is a curtain, blind, tent, sleeping bag, awning or nonwoven fabric.
11. The mixed compound of 1-50 weight% of synthetic feldspar particles of any one of Claims 2-4, and PE resin.
12. An air cap insulation sheet having infrared reflective properties made from the compound of claim 11.

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