CN117143473A - Building reflective heat insulation coating with good low-temperature stability - Google Patents
Building reflective heat insulation coating with good low-temperature stability Download PDFInfo
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- CN117143473A CN117143473A CN202311104660.XA CN202311104660A CN117143473A CN 117143473 A CN117143473 A CN 117143473A CN 202311104660 A CN202311104660 A CN 202311104660A CN 117143473 A CN117143473 A CN 117143473A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 66
- 238000009413 insulation Methods 0.000 title claims description 50
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000004005 microsphere Substances 0.000 claims abstract description 51
- 239000002245 particle Substances 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 24
- 239000004964 aerogel Substances 0.000 claims abstract description 22
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 229920006327 polystyrene foam Polymers 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
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- YLGXILFCIXHCMC-JHGZEJCSSA-N methyl cellulose Chemical compound COC1C(OC)C(OC)C(COC)O[C@H]1O[C@H]1C(OC)C(OC)C(OC)OC1COC YLGXILFCIXHCMC-JHGZEJCSSA-N 0.000 claims abstract description 11
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- -1 polypropylene Polymers 0.000 claims abstract description 11
- 229920001155 polypropylene Polymers 0.000 claims abstract description 11
- 239000010883 coal ash Substances 0.000 claims description 11
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- 239000006185 dispersion Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 239000011362 coarse particle Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
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- 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
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- 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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
- C09D1/08—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement with organic additives
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- 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
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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
The invention relates to the technical field of building coatings, and discloses a building reflective heat-insulating coating with good low-temperature stability, which comprises rubber powder and heat-insulating aggregate, wherein the rubber powder is prepared from the following raw materials in parts by weight: 140-160 parts of PO 42.5 cement, 15-21 parts of fly ash hollow microspheres, 7.5-17.5 parts of condensed silica fume, 2.5-5 parts of excitant, 2.5-5 parts of aerogel, 0.5-1 part of methyl cellulose ether, 0.5-1 part of polypropylene fiber and 3-7 parts of redispersible polymer powder; the heat-insulating aggregate is prepared from the following raw materials in parts by weight: 5-10.5 parts of polystyrene foam particles and 55-80.5 parts of vitrified hollow microspheres; the inorganic heat-insulating aggregate with different particle sizes and the organic heat-insulating aggregate are used for compounding, so that the heat-insulating aggregate particles are stacked in a best compact mode, macropores in a material structure are reduced, and micropores are increased, so that the material has a low heat conductivity coefficient, A-level combustion performance, good bonding strength, tensile strength, flexibility and low water absorption rate.
Description
Technical Field
The invention relates to the technical field of building coatings, in particular to a building reflective heat-insulating coating with good low-temperature stability.
Background
The building paint has decoration function, protection function and residence improvement function. The specific gravity of each function is different according to the purpose of use. The decoration function is a function of improving the appearance value of a building through the beautification of the building. Mainly comprises a planar color, pattern and luster conception design and a three-dimensional pattern conception design. But can be fully developed by matching the modeling of the building and the size and shape of the base material. The protection function means a function of protecting a building from environmental influences and damages. The content of the protection function requirements of different kinds of protected objects is different. The index difference required to be achieved between indoor and outdoor painting is very large. Some buildings have special requirements for mildew resistance, fire resistance, heat preservation, heat insulation, corrosion resistance and the like. The residence property improving function is mainly used for indoor coating, and is a function which is helpful for improving residence environment, such as sound insulation, sound absorbing coating, classification and condensation resistance;
with the growing tension of energy sources and the deep promotion of countries in energy conservation, environmental protection and sustainable development, the reflective heat-insulating coating is widely applied. The reflective heat-insulating coating is a novel energy-saving material developed in recent years, and can obviously reduce the temperatures of the outer wall, the roof and the indoor of a building by effectively reflecting, blocking and radiating the energy of sunlight, thereby effectively reducing the energy consumption of refrigeration equipment such as an air conditioner under the high-temperature condition. Therefore, the reflective heat-insulating coating not only can improve the working environment, but also saves a large amount of energy sources;
however, although the reflective heat-insulating coating produced in the current market has a certain reflective heat-insulating effect, the reflective heat-insulating coating does not have fireproof and flame-retardant properties, and limits the application range of the reflective heat-insulating coating.
Disclosure of Invention
The invention aims to provide a building reflective heat-insulating coating with good low-temperature stability, and solves the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the building reflective heat-insulating coating with good low-temperature stability comprises rubber powder and heat-insulating aggregate, wherein the rubber powder is prepared from the following raw materials in parts by weight: 140-160 parts of PO 42.5 cement, 15-21 parts of fly ash hollow microspheres, 7.5-17.5 parts of condensed silica fume, 2.5-5 parts of excitant, 2.5-5 parts of aerogel, 0.5-1 part of methyl cellulose ether, 0.5-1 part of polypropylene fiber and 3-7 parts of redispersible polymer powder; the heat-insulating aggregate is prepared from the following raw materials in parts by weight: 5-10.5 parts of polystyrene foam particles and 55-80.5 parts of vitrified hollow microspheres.
Preferably, the 3d compressive strength of the PO 42.5 grade cement is 20.3MPa;28d is 50.7MPa; the 3d flexural strength is 4.3MPa;28d is 7.7MPa.
Preferably, the exciting agent is a material which is prepared by processing sulfate and calcium-containing compounds and used for exciting the cement performance.
Preferably, the bulk density of the coal ash hollow microsphere is 418.8-720kg/m 3 The particle size was 0.1mm.
A preparation method of a building reflective heat insulation coating with good low-temperature stability comprises the following steps:
s1: firstly, preparing glue powder, which comprises the following steps:
a1: weighing PO 42.5 cement, coal ash hollow microspheres, condensed silica fume, an excitant, aerogel, methyl cellulose ether, polypropylene fibers and redispersible polymer powder according to a formula, and putting the mixture into a stirrer to form rubber powder;
a2: then, the rubber powder is screened by a square hole sieve with 0.6mm for two times, so that the full dispersion of the fibers in the rubber powder and the uniform dispersion of various raw materials are ensured, and coarse particles and lumps are avoided;
s2: placing polystyrene foam particles and vitrified hollow microspheres into a stirrer, and uniformly mixing the polystyrene foam particles and the vitrified hollow microspheres;
s3: and (3) matching the mixture obtained in the step (S2) with the rubber powder obtained in the step (A2) according to the formula proportion, then adding water, and finally preparing the building reflective heat-insulating coating.
Preferably, the rotating speed of the stirrer in A1 is 260-800r/min, and the stirring time is 2-5h.
Preferably, the stirring time is 1-2h under the condition that the rotating speed of the stirrer in the step S2 is 500-1000 r/min.
Preferably, the water in S3 accounts for 100-120 parts by mass.
The invention provides a building reflective heat-insulating coating with good low-temperature stability. The building reflective heat insulation coating with good low-temperature stability has the following beneficial effects:
(1) The building reflective heat insulation coating with good low-temperature stability is prepared by compounding inorganic heat insulation aggregates (vitrified hollow microspheres, fly ash hollow microspheres and glass hollow microspheres) with different particle sizes and organic heat insulation aggregates (foam polyphenyl particles), so that the heat insulation aggregates are best densely piled among particles, macropores in a material structure are reduced, and pores (holes) are increased, thereby ensuring that the material has very low heat conductivity and A-level combustion performance;
(2) The building reflective heat insulation coating with good low-temperature stability can properly reduce the heat conductivity coefficient of the building reflective heat insulation coating under the condition that the physical and mechanical properties of the building reflective heat insulation coating are not obviously affected by adding a proper amount of aerogel;
(3) The building reflective heat insulation coating with good low-temperature stability has the characteristics that the particle size of heat insulation aggregate is small, and the surface flatness of a heat insulation layer is high, so that when the building reflective heat insulation coating material is applied to an outer wall heat insulation material, a protective anti-cracking layer of alkali-resistant grid cloth composite plastering mucilage commonly seen in the common outer wall heat insulation material can be canceled, and light anti-cracking waterproof heat insulation putty with good flexibility and strong anti-cracking performance is used for replacing the common flexible putty, and the glass fiber net is not arranged in the light anti-cracking waterproof heat insulation putty layer, but the thickness of the light anti-cracking waterproof heat insulation putty layer is more than 2mm, and the light anti-cracking waterproof heat insulation putty layer has elasticity, so that a good coating base layer can be provided for the building reflective heat insulation coating, and the anti-cracking protective effect can be played;
(4) The building reflective heat insulation coating with good low-temperature stability has good bonding strength, tensile strength, flexibility and lower water absorption.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following specific examples, which are intended to be illustrative only and not limiting, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the invention are intended to be within the scope of the present invention.
Referring to fig. 1, the present invention provides the following technical solutions:
example 1
The building reflective heat-insulating coating with good low-temperature stability comprises rubber powder and heat-insulating aggregate, wherein the rubber powder is prepared from the following raw materials in parts by weight: 140 parts of PO 42.5 grade cement, 15 parts of fly ash hollow microspheres, 7.5 parts of condensed silica fume, 2.5 parts of an exciting agent, 2.5 parts of aerogel, 0.5 part of methyl cellulose ether, 0.5 part of polypropylene fiber and 3 parts of redispersible polymer powder; the heat-insulating aggregate is prepared from the following raw materials in parts by weight: 5 parts of polystyrene foam particles and 55 parts of vitrified hollow microspheres;
the 3d compressive strength of the PO 42.5 grade cement is 20.3MPa;28d is 50.7MPa; the 3d flexural strength is 4.3MPa;28d is 7.7MPa; the exciting agent adopts sulfate and calcium-containing compound to prepare materials for exciting the cement performance; the stacking density of the coal ash hollow microsphere is 418.8kg/m 3 Particle size of 0.1mm。
A preparation method of a building reflective heat insulation coating with good low-temperature stability comprises the following steps:
s1: firstly, preparing glue powder, which comprises the following steps:
a1: weighing PO 42.5 cement, coal ash hollow microspheres, condensed silica fume, an excitant, aerogel, methyl cellulose ether, polypropylene fibers and redispersible polymer powder according to a formula, and putting the mixture into a stirrer to form rubber powder;
the rotating speed of the stirrer is 260r/min, and the stirring time is 2h;
a2: then, the rubber powder is screened by a square hole sieve with 0.6mm for two times, so that the full dispersion of the fibers in the rubber powder and the uniform dispersion of various raw materials are ensured, and coarse particles and lumps are avoided;
s2: placing polystyrene foam particles and vitrified hollow microspheres into a stirrer, and uniformly mixing the polystyrene foam particles and the vitrified hollow microspheres;
stirring for 1h at the rotating speed of the stirrer of 500 r/min;
s3: matching the mixture obtained in the step S2 with the rubber powder obtained in the step A2 according to the formula proportion, then adding water, and finally preparing the building reflective heat-insulating coating;
the water accounts for 100 parts by mass.
Example two
The building reflective heat-insulating coating with good low-temperature stability comprises rubber powder and heat-insulating aggregate, wherein the rubber powder is prepared from the following raw materials in parts by weight: 160 parts of PO 42.5 grade cement, 21 parts of fly ash hollow microspheres, 17.5 parts of condensed silica fume, 5 parts of an exciting agent, 5 parts of aerogel, 1 part of methyl cellulose ether, 1 part of polypropylene fiber and 7 parts of redispersible polymer powder; the heat-insulating aggregate is prepared from the following raw materials in parts by weight: 10.5 parts of polystyrene foam particles and 80.5 parts of vitrified hollow microspheres;
the 3d compressive strength of the PO 42.5 grade cement is 20.3MPa;28d is 50.7MPa; the 3d flexural strength is 4.3MPa;28d is 7.7MPa; the exciting agent adopts sulfate and calcium-containing compound to prepare materials for exciting the cement performance; the stacking density of the coal ash hollow microsphere is 720kg/m 3 The particle size was 0.1mm.
A preparation method of a building reflective heat insulation coating with good low-temperature stability comprises the following steps:
s1: firstly, preparing glue powder, which comprises the following steps:
a1: weighing PO 42.5 cement, coal ash hollow microspheres, condensed silica fume, an excitant, aerogel, methyl cellulose ether, polypropylene fibers and redispersible polymer powder according to a formula, and putting the mixture into a stirrer to form rubber powder;
the rotating speed of the stirrer is 800r/min, and the stirring time is 5h;
a2: then, the rubber powder is screened by a square hole sieve with 0.6mm for two times, so that the full dispersion of the fibers in the rubber powder and the uniform dispersion of various raw materials are ensured, and coarse particles and lumps are avoided;
s2: placing polystyrene foam particles and vitrified hollow microspheres into a stirrer, and uniformly mixing the polystyrene foam particles and the vitrified hollow microspheres;
stirring for 2h at the rotating speed of the stirrer of 1000 r/min;
s3: matching the mixture obtained in the step S2 with the rubber powder obtained in the step A2 according to the formula proportion, then adding water, and finally preparing the building reflective heat-insulating coating;
the water accounts for 120 parts by mass.
Example III
The building reflective heat-insulating coating with good low-temperature stability comprises rubber powder and heat-insulating aggregate, wherein the rubber powder is prepared from the following raw materials in parts by weight: 150 parts of PO 42.5 grade cement, 18 parts of fly ash hollow microspheres, 15 parts of condensed silica fume, 3.5 parts of exciting agent, 3.5 parts of aerogel, 0.7 part of methyl cellulose ether, 0.8 part of polypropylene fiber and 5 parts of redispersible polymer powder; the heat-insulating aggregate is prepared from the following raw materials in parts by weight: 8 parts of polystyrene foam particles and 70 parts of vitrified hollow microspheres;
the 3d compressive strength of the PO 42.5 grade cement is 20.3MPa;28d is 50.7MPa; the 3d flexural strength is 4.3MPa;28d is 7.7MPa; the exciting agent adopts sulfate and calcium-containing compound to prepare materials for exciting the cement performance; the stacking density of the coal ash hollow microsphere is 600kg/m 3 The particle size was 0.1mm.
A preparation method of a building reflective heat insulation coating with good low-temperature stability comprises the following steps:
s1: firstly, preparing glue powder, which comprises the following steps:
a1: weighing PO 42.5 cement, coal ash hollow microspheres, condensed silica fume, an excitant, aerogel, methyl cellulose ether, polypropylene fibers and redispersible polymer powder according to a formula, and putting the mixture into a stirrer to form rubber powder;
the rotating speed of the stirrer is 500r/min, and the stirring time is 3.5h;
a2: then, the rubber powder is screened by a square hole sieve with 0.6mm for two times, so that the full dispersion of the fibers in the rubber powder and the uniform dispersion of various raw materials are ensured, and coarse particles and lumps are avoided;
s2: placing polystyrene foam particles and vitrified hollow microspheres into a stirrer, and uniformly mixing the polystyrene foam particles and the vitrified hollow microspheres;
stirring for 1.5h at the rotating speed of 750 r/min;
s3: matching the mixture obtained in the step S2 with the rubber powder obtained in the step A2 according to the formula proportion, then adding water, and finally preparing the building reflective heat-insulating coating;
the water accounts for 110 parts by mass.
Test results and discussion:
1) Influence of polystyrene foam particle-vitrified hollow microsphere ratio on fire resistance and flame retardance of building reflective heat insulation coating:
the test firstly researches the influence of different polystyrene foam particle-vitrified hollow microsphere ratios on the fire resistance and flame retardance of the building reflective heat-insulating coating. The test is divided into two cases of adding and not adding fly ash hollow microspheres into heat-insulating slurry. When no fly ash cenosphere was added, the test results are shown in table 1.
TABLE 1 Effect of organic-inorganic insulating aggregate ratios on fire resistance and flame retardance without fly ash hollow microspheres
The test results in Table 1 show that under the condition of not using the fly ash hollow microspheres, the building reflective heat-insulating coating meets the A-class nonflammable fireproof requirement, and the quantity of polyphenyl particles which can be added into the building reflective heat-insulating coating is small, and the mass ratio of the polyphenyl particles to the building reflective heat-insulating coating is only 1:14. The volume ratio of the polyphenyl particles to the vitrified hollow microspheres is about 1:1.5 according to the density of 12.1kg/m3 and the density of 116kg/m 3.
When fly ash cenospheres are used in the reflective heat-insulating coating for the construction, the ratio of polyphenyl particles to vitrified cenospheres is obviously reduced, and the results are shown in Table 2.
TABLE 2 Effect of organic-inorganic insulating aggregate ratios on fire resistance and flame retardance Using fly ash cenospheres
Note that: (1) secondary experiments after readjustment of the formulation.
The test results in Table 2 show that the fly ash hollow microsphere has obvious fireproof heat insulation effect in the building reflective heat insulation coating, and the volume ratio of the polyphenyl particles to the vitrified hollow microsphere is reduced from 1:1.5 to below 1:1.0 due to the addition of the additive. This reduction is significant because the larger the amount of polyphenyl particles that can be used in the reflective insulation coating of a building, the better the insulation properties of the material, and the smaller the amount of broken glass hollow microspheres due to the small size of the slurry during construction.
The hollow flyash microballoon can raise fireproof performance of heat insulating paint, and has spherical hollow structure and vitrified thin wall casing, lowered cement component density and raised heat insulating performance;
2) Influence of fly ash hollow microspheres on physical and mechanical properties of building reflective heat-insulating paint:
the hollow flyash microsphere is one kind of material with volcanic ash activity in cement base material and its addition has certain effect on the physical and mechanical performance of the heat insulating coating. Table 3 shows our test results for these performance items.
TABLE 3 variation of physical and mechanical properties of reflective heat-insulating coating for buildings by adding fly ash hollow microspheres
The results in Table 3 demonstrate that the addition of the fly ash cenospheres has a slight, but not significant, effect on the dry density of the architectural reflective insulation coating. This means that the addition of the fly ash hollow microspheres increases the compactness of the reflective heat-insulating coating for buildings, that is, the density of the cementitious slurry itself may be reduced after hardening, but a part of the added slurry fills the gaps between the polyphenyl particles, so that the compactness of the reflective heat-insulating coating for buildings as a whole is increased. This variation improves the uniformity of the insulating slurry, thereby reducing the thermal conductivity of the material.
On the other hand, under a certain addition amount, the addition of the hollow coal ash microspheres improves the compressive strength and the compression-shear bonding strength of the building reflective heat insulation coating, but the maximum addition amount is possible, and the further test is still needed.
The compressive strength of each of the reflective insulating coatings for construction in table 3 was not high, and therefore, agglomerated silica powder capable of significantly exciting the activity of cement-based materials was used to improve the compressive strength. The results (see Table 4) show that the addition of the agglomerated silica powder not only can obviously improve the compressive strength of the reflective heat-insulating coating for the building, but also can improve the bonding strength of the reflective heat-insulating coating for the building. The test results are in accordance with the action principle of the agglomerated silica powder in the cement-based material.
TABLE 4 variation of physical and mechanical properties of reflective heat-insulating coating for buildings by adding agglomerated silica powder
3) Influence of aerogel on heat preservation and insulation properties of building reflective heat insulation coating:
the test results of the influence of aerogel added to the heat insulation material of the reflective heat insulation coating for building on the heat insulation performance are shown in table 5.
TABLE 5 test results of aerogel effects on thermal conductivity of reflective insulation coatings for buildings
| Sample numbering | Thermal conductivity coefficient (W/m.K) of inorganic material coated polyphenyl granule aerogel composite thermal insulation material (thermal cracking protection) |
| 1 | 0.0535 |
| 2 | 0.0498 |
| 3 | 0.0465 |
| 4 | 0.0421 |
| 5 | 0.0404 |
In table 5, the addition amount of aerogel increases in order from No. 1 to No. 5. It can be seen that the aerogel has a significant effect on the thermal conductivity of the reflective insulation coating material of the building. However, the addition of aerogel can have two adverse effects. Firstly, the aerogel is expensive, but the addition of the aerogel can obviously reduce the physical and mechanical properties of the building reflective heat insulation coating material. Thus, its addition should be kept within certain limits. In other words, aerogels can only be used as an additive for improving properties in building reflective insulation coating materials, but cannot be used as a main material. The main performance (heat preservation and insulation performance and A-level incombustibility) of the building reflective heat insulation coating material is realized by polystyrene foam particles, vitrified hollow microspheres, fly ash hollow microspheres, condensed silica fume and other materials.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Claims (8)
1. The building reflective heat insulation coating with good low-temperature stability comprises rubber powder and heat insulation aggregate, and is characterized in that: the adhesive powder is prepared from the following raw materials in parts by weight: 140-160 parts of PO 42.5 cement, 15-21 parts of fly ash hollow microspheres, 7.5-17.5 parts of condensed silica fume, 2.5-5 parts of excitant, 2.5-5 parts of aerogel, 0.5-1 part of methyl cellulose ether, 0.5-1 part of polypropylene fiber and 3-7 parts of redispersible polymer powder; the heat-insulating aggregate is prepared from the following raw materials in parts by weight: 5-10.5 parts of polystyrene foam particles and 55-80.5 parts of vitrified hollow microspheres.
2. The building reflective heat insulation coating with good low-temperature stability according to claim 1, which is characterized in that: the 3d compressive strength of the PO 42.5 grade cement is 20.3MPa;28d is 50.7MPa; the 3d flexural strength is 4.3MPa;28d is 7.7MPa.
3. The building reflective heat insulation coating with good low-temperature stability according to claim 1, which is characterized in that: the exciting agent is a material which is prepared by processing sulfate and calcium-containing compounds and used for exciting the cement performance.
4. The building reflective heat insulation coating with good low-temperature stability according to claim 1, which is characterized in that: the bulk density of the coal ash hollow microsphere is 418.8-720kg/m 3 The particle size was 0.1mm.
5. A preparation method of a building reflective heat insulation coating with good low-temperature stability is characterized by comprising the following steps: the method comprises the following steps:
s1: firstly, preparing glue powder, which comprises the following steps:
a1: weighing PO 42.5 cement, coal ash hollow microspheres, condensed silica fume, an excitant, aerogel, methyl cellulose ether, polypropylene fibers and redispersible polymer powder according to a formula, and putting the mixture into a stirrer to form rubber powder;
a2: then, the rubber powder is screened by a square hole sieve with 0.6mm for two times, so that the full dispersion of the fibers in the rubber powder and the uniform dispersion of various raw materials are ensured, and coarse particles and lumps are avoided;
s2: placing polystyrene foam particles and vitrified hollow microspheres into a stirrer, and uniformly mixing the polystyrene foam particles and the vitrified hollow microspheres;
s3: and (3) matching the mixture obtained in the step (S2) with the rubber powder obtained in the step (A2) according to the formula proportion, then adding water, and finally preparing the building reflective heat-insulating coating.
6. The building reflective heat insulation coating with good low-temperature stability according to claim 5, which is characterized in that: the rotating speed of the stirrer in A1 is 260-800r/min, and the stirring time is 2-5h.
7. The encoder cable entry structure of claim 5, wherein: and S2, stirring for 1-2 hours under the condition that the rotating speed of the stirrer is 500-1000 r/min.
8. The encoder cable entry structure of claim 5, wherein: and S3, the water accounts for 100-120 parts by mass.
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