CN112266650A - Porous high-sunlight-reflection particles made of silicon dioxide - Google Patents
Porous high-sunlight-reflection particles made of silicon dioxide Download PDFInfo
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- 239000002245 particle Substances 0.000 title claims abstract description 82
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 30
- 235000012239 silicon dioxide Nutrition 0.000 title abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001354 calcination Methods 0.000 claims abstract description 10
- 239000006184 cosolvent Substances 0.000 claims abstract description 6
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 3
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 3
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 17
- 239000010426 asphalt Substances 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000004381 surface treatment Methods 0.000 claims description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000005871 repellent Substances 0.000 claims description 4
- 230000002940 repellent Effects 0.000 claims description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 3
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 3
- 239000010433 feldspar Substances 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 2
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 229910021488 crystalline silicon dioxide Inorganic materials 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000002310 reflectometry Methods 0.000 description 13
- 239000010453 quartz Substances 0.000 description 9
- 239000008187 granular material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 239000005995 Aluminium silicate Substances 0.000 description 3
- 235000012211 aluminium silicate Nutrition 0.000 description 3
- 239000007771 core particle Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052900 illite Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 241001085205 Prenanthella exigua Species 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 241000221096 Simmondsia chinensis Species 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 1
- 229910052912 lithium silicate Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention relates to porous high solar light reflecting particles made of silicon dioxide, which are prepared by SiO2The powder is formed by adding a cosolvent and calcining, and the particles have the following characteristics: 15-35% of water absorption and 90-100% of UV Opacity. The invention also relates to a preparation method of the porous high-sunlight-reflection particles made of silicon dioxide and application of the porous high-sunlight-reflection particles in reflection and energy conservation of building surfaces.
Description
Technical Field
The invention relates to the field of building surface energy-saving materials, in particular to porous high-sunlight-reflection particles made of silicon dioxide.
Background
To reduce energy consumption, the U.S. California mandates that low grade roofing also achieve 70% reflectivity. The method is a very effective heat-shielding technology by adhering high-reflectivity sand on the surface of asphalt roofing material.
Compared with reflective materials such as plastics, metals, organic coatings and the like, the high-reflection sand has the characteristics of low cost and aging resistance. However, most white granules on the market, such as quartz, calcite, calcined kaolin and synthetic granules, have high reflectivity measured by stacking granules, but have low reflectivity after being laid on a black material, and are often accompanied by obvious oil absorption phenomenon, so that the sand is discolored, and the reflectivity is further reduced. In addition, since the ultraviolet light blocking ratio (UV visibility) of the pellets is low, the asphalt base material to which the pellets are attached is easily aged, thereby causing the pellets to fall off.
US9714512B discloses a cool roofing system comprising highly reflective calcined kaolin particles having a reflectance of 80-92% coated with a polymeric organic coating applied to a roofing substrate to form a roofing system having a reflectance of not less than 70%, the bright white calcined kaolin particles employed in this patent being limited in their application to the market by the source location.
US9944562B discloses a high reflectivity particle and a method for its preparation, wherein the particle comprises a sand core particle and at least one coating layer, wherein the sand core particle comprises calcined ammonium illite obtained by calcining ammonium illite ore at 700-1200 ℃, the sand core particle is coated with an inorganic coating and then calcined at 800-1200 ℃ to obtain a particle having a particle size of 0.1-3.5 mm, having a solar reflectance SR of not less than 80% and a pollution index DL of less than 6%.
US20150192698 discloses highly reflective ultra-white roofing granules prepared from a homogeneous mixture comprising clay, sintered material and optionally quartz particles, having a solar reflectance SR above 80%.
The market needs a high UV visibility, high solar reflectance particle that can be supplied in large quantities, on the other hand, the manufactured particle is expected to have the characteristics of porosity, high whiteness, high reflectance, small amount of usage, and the like, and the manufactured final roofing product is expected to have high reflectance, long service time, and easy maintenance.
Disclosure of Invention
The inventors have found that porous particles made of silica can provide high UV blocking, high solar reflectance particles that are highly reflective when tiled onto a black substrate.
According to one or more embodiments of the present invention, the particles are synthesized from clean silica powder by molding and calcining with the addition of cosolvents, including glass frit, feldspar, and alkali metal silicates and carbonates.
The inventors have found that the particles so synthetically produced have high UV blocking and suitable strength; the inventors have also found that such particles can be used on bitumen to obtain very high solar reflectance. According to one or more aspects of the present invention, the particles are made to have excellent indexes by controlling, for example, whiteness indexes, particle sizes, molding, and calcining processes of raw materials.
In one aspect of the invention, the particles are made from silica, which is widely available and has a quality that is easily controlled. Silica is widely used in ceramic industry, refractory industry, filler industry and other industries, but porous particles made of silica are used for reflective particles, and reports are not found yet.
In one aspect of the invention, there is provided the use of said particles for reflective energy saving of building surfaces.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a porous high solar light reflective silica particle is prepared by adding a cosolvent into silica powder and calcining the silica powder, wherein the particle has the following characteristics:
SiO2the content is more than or equal to 95 percent;
82-90% SR;
90-100% UV Opacity.
The silicon dioxide powder comprises crystalline silicon dioxide powder and amorphous silicon dioxide powder.
The cosolvent comprises feldspar, glass powder, alkali metal silicate and alkali metal carbonate, calcium carbonate, magnesium carbonate and the like.
The crushing index is between 15% and 35%, preferably 20% to 30%.
The particles may be surface treated on the surface.
The surface treatment comprises an inorganic coating surface treatment, an organic coating surface treatment, a water repellent surface treatment or a combination of one or more of the foregoing.
The particles are useful for reflective energy-saving applications on building surfaces.
The building surface is an asphalt coiled material or plate roof, a polyurethane foam plate roof or a metal roof.
Drawings
FIG. 1 is a flow chart of the present invention for preparing porous high solar reflective particles made of silica;
FIG. 2 is an X-ray diffraction pattern of porous highly solar reflective silica particles of the present invention.
Detailed Description
In order to explain the advantages of the porous high solar reflective particles made of silica in detail and perfectly, the following description will be given with reference to specific examples. The examples described below are merely representative and do not include all aspects of the present invention.
According to the technical scheme provided by the invention, the UV blocking rate is used for representing the impermeability of an object to light in an ultraviolet range.
According to the technical scheme provided by the invention, the Sunlight Reflectivity (SR) is used for representing the capability of the material for reflecting the sunlight incident to the surface of the material, and the sunlight reflectivity SR of the particles is 80-90%.
According to the technical scheme provided by the invention, the crushing index represents the capability of the particles for resisting crushing so as to indirectly estimate the corresponding strength of the particles, and the crushing index of the particles is between 15 and 35 percent, preferably between 20 and 30 percent.
According to the technical scheme provided by the invention, the water absorption rate of the mineral material is mainly determined by the porosity of the mineral material.
According to the technical scheme provided by the invention, the porosity of the particles is reflected by the water absorption rate.
According to the technical scheme provided by the invention, the silicon dioxide comprises crystal and amorphous, the silicon dioxide is commercially available, and suppliers such as Hebei Chi Tao Gao GmbH in China.
According to the technical scheme provided by the invention, in order to enable the particles to be suitable for roofing materials, the particles are crushed into particles with the particle size of 0.1-3.5 mm, and preferably 0.3-2.3 mm.
According to the technical scheme provided by the invention, the particles can further obtain the characteristics of water resistance, pollution resistance, algae resistance and the like through surface treatment, and the surface treatment generally comprises the following steps: one or more of inorganic coating surface treatment, organic coating surface treatment and waterproof agent surface treatment.
According to the technical scheme provided by the invention, the inorganic coating is a liquid inorganic coating of at least one selected from silicate, aluminum phosphate, silica sol and aluminum sol; the silicate is selected from sodium silicate, potassium silicate, aluminum silicate, lithium silicate or a mixture of one or more of them.
According to the technical scheme provided by the invention, the organic coating is selected from acrylic coatings or silicone-acrylic coatings; the water repellent may be selected from silane, silicone, fluorine-containing water repellent.
According to the technical scheme provided by the invention, the inorganic coating, the organic coating or the waterproof agent can further comprise one or more selected from the following components: pigment, algae inhibitor, pesticide, self-cleaning agent, viscosity regulator, fluxing agent, flame retardant, surface tension modifier and anti-aging agent.
According to the technical scheme provided by the invention, the particles can be used for the surface layer of a roof material taking cement, asphalt, polyurethane foam laminate and metal plate as base materials to improve the sunlight reflectivity of the roof, and after the particles are applied to an asphalt coiled material or a plate material with the coverage rate of more than 90 percent, the particles have the sunlight reflectivity of 70-85 percent; after the particles are applied to the surface layer of a foam board such as polyurethane and the like at a coverage rate of more than 90%, the solar reflectance is 80-90%.
According to the technical scheme provided by the invention, the particles can also be used for sand-wall-shaped building coatings to generate high-reflectivity coatings, and the coatings have the effect of white particles.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following examples are provided to describe the invention in more detail. These examples, which illustrate specific embodiments and preferred modes presently contemplated for carrying out the invention, are intended to be illustrative and not limiting of the invention.
General description of assay methods
Whiteness: the color value is measured by using a color difference meter, a certain amount of measured sample is taken and put into a sample presser to be pressed into a tablet, the relatively flat surface of the sample is measured by using the color difference meter, the values of L, a and b are read, the measurement is repeated for three times, and the average value is taken.
Water absorption: selecting about 50g of particles to be measured, immersing the particles in a beaker containing water, stirring the particles for 10 seconds by using a glass rod, immersing cotton cloth in the water, twisting the cotton cloth until no liquid drips, spreading the cotton cloth, taking out sand immersed in the water, and putting the sand into the cotton clothWiping the granules with cotton cloth till no water stain is on the surface of the granules, and weighing about 5-10 g (m) of the wiped granules with a ten-thousandth balance1) Putting into a beaker, drying with a 105 deg.C oven to constant weight, and measuring the weight m of the dried granules2。
The water absorption was calculated using the following formula:
water absorption rate of (m)1-m2)/m2*100％。
UV Opacity
The instrument comprises the following steps: the method is carried out by adopting a floodlight box, a standard gray scale, a filter, a camera and a pore plate.
The method comprises the following steps: turning on a floodlight for 10 minutes, preheating a light box, taking 5g of particle samples obtained by sieving through Tyler 10-mesh and 12-mesh sieves, respectively placing the particle samples on 100 holes of a hole plate, ensuring that each particle covers one hole by using tweezers, then covering a cover plate on the plate, checking whether light leaks or not, and if light leaks, adjusting until no light penetrates through the holes;
longitudinally cutting the standard gray scale into two same color plates from the middle of the standard gray scale, overlapping the two color plates, enabling the 14 th step of the lower gray scale to coincide with the 1 st step of the upper gray scale, placing the combined gray scale on 10 holes of a cover plate of a pore plate, enabling the 14 th step of the lower gray scale to coincide with the 1 st step of the upper gray scale and to be placed on the 5 th hole of the left side, fixing the color plates by using an adhesive tape, and checking to ensure that all the holes are completely covered by the gray scale and the adhesive tape cannot cover the holes;
fixing a camera right above the square opening through a bracket, turning off indoor light and ensuring a dark state, and taking a picture by using the camera;
inputting the picture into a computer, opening the picture by using Photoshop software, and adjusting the contrast of the picture to ensure that the brightness of the 5 th hole on the left side of the gray-scale card nearly disappears, and counting the number of bright points (the number n of the holes) on the picture.
UV opacity was calculated according to the following formula:
UV opportunity-number of put particles-number of bright spots ═ 100-n)/100 ×.100%.
Solar reflectance (particle itself)
The reflectivity of the sample is detected by a sunlight spectrum reflectometer, the reflectometer is adjusted to b891 standard for measurement, 50g of particle sample is put into a flat sample disc, the surface is compacted and scraped by a ruler, and 3 points are randomly selected on the surface for measurement.
Solar reflectance (after applying to asphalt board)
Detecting the reflectivity of a sample by using a sunlight spectrum reflectometer, adjusting the reflectometer to b891 standard for measurement, uniformly scattering enough particles on a low-melting-point viscous asphalt plate, flattening, removing particles which are not adhered on the surface, and randomly selecting 3 points on the surface of the asphalt plate for measurement.
Example 1
Quartz powder obtained from Industrial products, Inc. of Chiari, Hebei, China was used in accordance with the following criteria.
Table 1: the nature of the powder used
| Numbering | Mineral substance | Particle size of powder | Whiteness L | Degree of whiteness a | Whiteness b |
| 1 | Quartz powder | 2000 mesh | 96 | 0 | 1 |
| 2 | Quartz powder | 1250 mesh | 95 | 0 | 1 |
| 3 | Quartz powder | 600 mesh | 95 | 0 | 1 |
| 4 | Quartz powder | 200 mesh | 94 | 1 | 1 |
The process of preparing particles from quartz powder is carried out as follows:
weighing 10kg of powder, adding 1.5kg of water glass solution with the modulus of 2.5:1 and the solid content of 30%, uniformly mixing in a wheel mill, pressing into a green body of 240x115x53mm by adopting a 100-ton press machine, heating in a high-temperature furnace at 1250 ℃ for 10h, cooling, crushing into particles of 0.5-2 mm by using a crusher, and detecting UV Opacity, particle SR and SR on an asphalt board.
Table 2: properties of the particles
| Experiment number | Powder used | UV Opacity％ | The particles are SR% | SR% on asphalt sheet |
| 1 | 1 | 100 | 90 | 81 |
| 2 | 2 | 90 | 89 | 79 |
| 3 | 3 | 80 | 88 | 74 |
| 4 | 4 | 75 | 88 | 68 |
From the above table, it can be seen that although the pellets have similar SR values in different UV options, the pellets with high UV options result in significantly higher SR values after application to the asphalt sheet.
Example 2
The preparation process of the particles is as follows:
weighing 10kg of quartz powder numbered 1, adding 1.5kg of water glass solution with the modulus of 2.5:1 and the solid content of 30%, uniformly mixing in a wheel mill, pressing into 240x115x53mm green bodies by adopting a 100-ton press machine, respectively putting the green bodies into high-temperature furnaces with the temperatures of 750 ℃, 900 ℃, 1050 ℃ and 1300 ℃ for heating for 10 hours, crushing the green bodies into particles with the diameters of 0.5-2 mm by using a crusher after cooling, and detecting the influence of the calcination temperature on UV options, the SR of the particles, the SR on an asphalt board and the crushing index.
Table 3: properties of the particles
| Calcination temperature | Water absorption% | UV Opacity％ | The particles are SR% | SR% on asphalt sheet | Crushing index% |
| 750 | 50 | 100 | 90 | 82 | 40 |
| 900 | 30 | 100 | 90 | 82 | 30 |
| 1050 | 15 | 90 | 89 | 70 | 20 |
| 1300 | 10 | 80 | 88 | 65 | 15 |
As can be seen from the above table, the calcination temperature is low, the particle strength is low, and the calcination temperature is high, and the UV Opacity is low.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A porous high solar light reflective silica particle is prepared by adding a cosolvent into silica powder and calcining the silica powder, wherein the particle has the following characteristics:
SiO2the content is more than or equal to 95 percent;
82-90% SR;
90-100% UV Opacity.
2. The silica porous solar reflective particle according to claim 1, wherein: the silicon dioxide powder comprises crystalline silicon dioxide powder and amorphous silicon dioxide powder.
3. The silica porous solar reflective particle according to claim 1, wherein: the cosolvent comprises feldspar, glass powder, alkali metal silicate and alkali metal carbonate, calcium carbonate, magnesium carbonate and the like.
4. The silica porous solar reflective particle according to claim 1, wherein: the crushing index is between 15% and 35%, preferably 20% to 30%.
5. The silica porous solar reflective particle according to claim 1, wherein: the particles may be surface treated on the surface.
6. The silica porous solar reflective particle according to claim 5, wherein: the surface treatment comprises an inorganic coating surface treatment, an organic coating surface treatment, a water repellent surface treatment or a combination of one or more of the foregoing.
7. The silica porous solar reflective particle according to claim 1, wherein: the particles are useful for reflective energy-saving applications on building surfaces.
8. The silica porous solar reflective particle according to claim 7, wherein: the building surface is an asphalt coiled material or plate roof, a polyurethane foam plate roof or a metal roof.
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| CN110877973A (en) * | 2018-09-06 | 2020-03-13 | 石家庄日加精细矿物制品有限公司 | Ceramic particle with high UV blocking rate and high sunlight reflectivity |
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| CN102850593A (en) * | 2012-09-18 | 2013-01-02 | 蚌埠鑫源石英材料有限公司 | Preparation method of black silicon dioxide powder material |
| CN110582349A (en) * | 2017-01-06 | 2019-12-17 | Ep矿产有限公司 | Ultra-high performance and high purity biosilica filter media |
| CN110877973A (en) * | 2018-09-06 | 2020-03-13 | 石家庄日加精细矿物制品有限公司 | Ceramic particle with high UV blocking rate and high sunlight reflectivity |
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