CN113025128A - Reflective heat-insulating coating and preparation method thereof - Google Patents
Reflective heat-insulating coating and preparation method thereof Download PDFInfo
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- 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
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
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- 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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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08K2003/2241—Titanium dioxide
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Abstract
The application relates to a reflective heat-insulation coating and a preparation method thereof, wherein the coating is prepared from the following raw materials in parts by weight: 20-30 parts of styrene-acrylic emulsion, 2-8 parts of sericite powder, 10-30 parts of rutile titanium dioxide, 4-8 parts of anionic carboxyl silicone oil emulsion, 1-3 parts of PESO defoaming agent, 8-12 parts of floating beads, 6-10 parts of kaolin and 10-20 parts of water; the preparation method of the coating comprises the following steps: preparing materials, seasonings and preparing materials. The coating has the advantages of effectively guaranteeing the heat insulation performance of the coating, improving the stability of the coating after long-time use, and facilitating the effect of fast and efficient coating preparation of operators.
Description
Technical Field
The application relates to the field of reflective heat-insulating coatings, in particular to a reflective heat-insulating coating and a preparation method thereof.
Background
At present, the reflective heat insulation coating is a cooling coating with low heat conductivity coefficient and high heat resistance. After the reflective heat-insulating coating is brushed on the outer surface of the structure, the reflective heat-insulating coating can reflect the solar infrared rays and ultraviolet rays in the range of 400nm-2500nm, and further the phenomenon of accumulation and temperature rise of the solar heat on the outer surface of the structure is reduced. Meanwhile, the reflective heat-insulating coating can further dissipate heat and reduce temperature of the structure through radiating heat outwards.
Chinese patent No. CN103865344B discloses a reflective thermal insulation coating, which comprises a reflective coating and modified floating beads. The preparation method of the reflective coating comprises the following steps: adding water and an auxiliary agent into a container, stirring until the water and the auxiliary agent are dissolved uniformly, adding titanium dioxide, barium sulfate and mica powder, and dispersing at a high speed of 800-1200rpm for 8-10 min. Reducing the rotating speed to 300-500rpm, adding the emulsion, stirring for 20-40min, continuing to perform dispersion treatment at the rotating speed of 300-500rpm, and finally adding the modified floating beads and the cellulose ether to stir uniformly. The preparation method of the modified floating bead comprises the following steps: feeding the fly ash floating beads into a high-efficiency powder mixer with a spray head, quantitatively spraying the special slurry for the modified floating beads prepared in advance under normal temperature stirring, continuously stirring for 20-30min after the slurry is sprayed, discharging, baking and cooling at 95-105 ℃, and screening and grading to obtain the modified floating beads. The prepared reflective coating is uniformly distributed in the modified floating bead, and the reflective heat-insulating coating can be obtained.
In view of the above-mentioned related technologies, the inventors believe that there is a defect that the reflective thermal insulation coating is liable to have a phenomenon of reduced thermal insulation performance after long-term use, and further the use effect of the reflective thermal insulation coating is affected.
Disclosure of Invention
In order to solve the problem that the heat insulation performance of the reflective heat insulation coating is easily reduced after the reflective heat insulation coating is used for a long time, the application provides a reflective heat insulation coating.
The application provides a reflective heat insulation coating adopts following technical scheme:
the reflective heat-insulation coating is prepared from the following raw materials in parts by weight:
20-30 parts of styrene-acrylic emulsion, 2-8 parts of sericite powder, 10-30 parts of rutile titanium dioxide, 4-8 parts of anionic carboxyl silicone oil emulsion, 1-3 parts of PESO defoaming agent, 8-12 parts of floating beads, 6-10 parts of kaolin and 10-20 parts of water.
By adopting the technical scheme, the styrene-acrylic emulsion rapidly polymerizes other raw materials in the coating through the high adhesive force of the styrene-acrylic emulsion, and the anionic carboxyl silicone oil emulsion can further accelerate the combination speed of the raw materials after contacting with water, so that the forming time of the coating is shortened; meanwhile, the anionic carboxyl silicone oil emulsion is beneficial to improving the binding activity of the styrene-acrylic emulsion, accelerating the film forming speed of the outer surface of the coating and ensuring the heat insulation performance of the coating; the floating beads and the rutile type titanium dioxide effectively ensure the use stability of the formed coating through the high hardness and the thermal stability of the floating beads and the rutile type titanium dioxide, and meanwhile, the permeability of a coating film layer can be ensured through a large amount of rutile type titanium dioxide, so that the heat insulation performance of the film layer is improved; the kaolin guarantees the forming stability of the film layer through the fine texture of the kaolin, and the forming permeability of the film layer can be further improved; the sericite powder and the PESO defoaming agent improve the use stability and weather resistance of the coating after forming through self-stable chemical properties and permeability, thereby ensuring the stability and service life of the coating after long-time use while ensuring higher heat insulation protection performance of the coating.
Preferably, the coating also comprises 1-3 parts by weight of a film-forming aid, wherein the film-forming aid is dodecyl alcohol ester.
By adopting the technical scheme, the dodecyl alcohol ester is used for being matched with the anionic carboxyl silicone oil emulsion to stabilize the ion proportion of each component in the raw materials and promote the composition of the complexation reaction in the raw materials so as to further improve the stability of the formed coating; meanwhile, the dodecyl alcohol ester can reduce the film forming temperature of the outer surface of the coating, so that the film forming speed is increased, and the stability of the internal structure of the coating is guaranteed.
Preferably, the coating further comprises 2-6 parts by weight of a dispersant, and the dispersant is stearamide.
By adopting the technical scheme, after the stearamide is combined with the styrene-acrylic emulsion, the separation speed and the matching efficiency of emulsion molecules can be increased, and the use efficiency of the styrene-acrylic emulsion is improved; meanwhile, the stearamide further accelerates the interaction among the raw materials of the coating through extremely strong adhesive force, affinity and lubricity, so that the coating has longer stable running-in time in the coating forming period, and the quality of the coating after forming and the stability of the coating after long-time use are guaranteed.
Preferably, the coating further comprises 2-4 parts by weight of a thickening agent, and the thickening agent is sodium carboxymethyl cellulose.
By adopting the technical scheme, the sodium carboxymethyl cellulose is used for being matched with the styrene-acrylic emulsion to increase the firmness of the combined raw materials and ensure the use stability of the formed coating; meanwhile, the sodium carboxymethyl cellulose can promote the use activity of the dodecyl alcohol ester, and further ensure the film forming stability of the coating film layer while promoting the forming of the coating film layer, thereby further improving the heat insulation stability and the use stability of the coating after long-time use.
In a second aspect, in order to solve the problems of long time and low efficiency of preparing a coating with high use stability by operators, the application provides a preparation method of a reflective heat-insulation coating.
The preparation method of the reflective heat-insulation coating comprises the following preparation steps:
preparing materials: accurately weighing all the raw materials according to the formula ratio for later use;
seasoning: pouring all the sodium carboxymethylcellulose into a container filled with water, and uniformly stirring to obtain a first material for later use; pouring all the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion and the dodecyl alcohol ester into a container, raising the temperature of an inner cavity of the container to 80-120 ℃, and stirring at the speed of 600-800 r/min for 20-40min to prepare a second material for later use;
preparing materials: and putting the first material, sericite powder, rutile type titanium dioxide, a PESO defoaming agent, floating beads, kaolin and stearamide into the second material, and stirring at the stirring speed of 1200-3000 r/min for 30-60min to obtain the coating.
By adopting the technical scheme, operators can quickly, conveniently and efficiently prepare the reflective heat-insulating coating with high use stability.
Preferably, the following steps are added in the material preparation step: crushing the kaolin by using crushing equipment for 3-5min, and screening the crushed kaolin with 40-60 meshes.
By adopting the technical scheme, the kaolin which is crushed and sieved becomes finer, so that the contact area between the kaolin and other raw materials is larger, the reaction bonding rate is higher, and the bonding stability is stronger, the forming speed and the forming quality of the coating are effectively improved, and the stability of the coating after long-time use is ensured.
Preferably, the seasoning step comprises: the stirring speed of the stirring device of the container to the sodium carboxymethylcellulose and the water is 800-.
By adopting the technical scheme, the sodium carboxymethylcellulose and the water can be fully combined after being stirred for a certain time at a specific stirring speed, so that the reaction time when the sodium carboxymethylcellulose is combined with the styrene-acrylic emulsion and other raw materials is shortened, the time for full reaction of the raw materials is ensured, and the stability of the coating after being formed is further improved.
Preferably, the seasoning step comprises: the temperature rise rate of the second material is 5-8 ℃/min.
By adopting the technical scheme, the proper heating rate is beneficial to the precipitation of the low-temperature raw materials for sufficient time to carry out the reaction, and the phenomenon that part of the raw materials are not fully reacted and inactivated due to sudden heating is reduced; meanwhile, the proper heating rate is helpful for carrying out step-type full reaction among different raw materials, so that the reaction and shaping of the raw materials in the coating are also in step-type superposition, and a multi-stage stable structure is formed inside the coating, so that the stability of the coating after long-time use is further improved.
Preferably, the following steps are added in the material preparation step: the second material is cooled to 20-40 ℃ before being stirred.
Through adopting above-mentioned technical scheme, the cooling is fully helped ensuring the combination sufficiency of reacting the raw materials in advance, simultaneously, the raw materials of more follow-up addition reactions of being convenient for react in comparatively adapted temperature and combine, and this process has effectively reduced the phenomenon that partial raw materials do not react completely yet and stereotype, has ensured the overall stability after the coating shaping to can effectively reduce the coating phenomenon that the coating is sick after using for a long time.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the styrene-acrylic emulsion rapidly polymerizes other raw materials in the coating through the high adhesive force of the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion is beneficial to improving the binding activity of the styrene-acrylic emulsion, and the rutile titanium dioxide with a large dose can ensure the permeability of a coating film layer, so that the heat insulation performance of the film layer is improved, and the long-term use stability of the coating after being formed is effectively ensured;
2. the sodium carboxymethylcellulose and the water can be fully combined after being stirred for a certain time at a specific stirring speed, so that the reaction time when the sodium carboxymethylcellulose is combined with the styrene-acrylic emulsion and other raw materials is shortened, the time for full reaction of the raw materials is ensured, and the stability of the coating after being formed is further improved.
Detailed Description
Examples
All the starting materials used in this example are commercially available products. Wherein the water is pure drinking water for human and livestock.
Example 1
The preparation method of the reflective heat-insulating coating comprises the following preparation steps:
preparing materials: according to the formula ratio, 20kg of styrene-acrylic emulsion, 2kg of sericite powder, 10kg of rutile type titanium dioxide, 4kg of anionic carboxyl silicone oil emulsion, 1kg of PESO defoaming agent, 8kg of floating bead, 10kg of water, 1kg of dodecyl alcohol ester, 2kg of stearamide and 2kg of sodium carboxymethyl cellulose are accurately weighed by a weighing balance for later use. Wherein, the kaolin is weighed in the seasoning step.
Seasoning: and (3) pouring the kaolin into a crusher for crushing for 3 min. The crushed kaolin was sieved through a 40 mesh sieve, and 6kg of the sieved kaolin was accurately weighed on a weighing balance for use.
Pouring water into the first stirring kettle, uniformly and slowly scattering sodium carboxymethylcellulose into the first stirring kettle, and simultaneously starting the first stirring kettle for stirring. The stirring speed of the first stirring kettle is controlled at 800r/min, the stirring time is 5min, and a first material is prepared for later use.
And sequentially pouring the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion and the dodecyl alcohol ester into a second stirring kettle, and raising the temperature in the second stirring kettle to 80 ℃ at the heating rate of 5 ℃/min by using a heating rod. And starting a second stirring kettle for stirring, wherein the stirring speed of the second stirring kettle is 600r/min, and the stirring time is 20min, so as to prepare a second material for later use.
Preparing materials: and when the temperature of the material II is reduced to 20 ℃, sequentially putting the material I, the sericite powder, the rutile type titanium dioxide, the PESO defoaming agent, the floating beads, the kaolin and the stearamide into a second stirring kettle for stirring. The stirring speed of the second stirring kettle is 1200r/min, and the stirring time is 30min, so as to prepare the coating.
Example 2
The preparation method of the reflective heat-insulating coating comprises the following preparation steps:
preparing materials: according to the formula ratio, 30kg of styrene-acrylic emulsion, 8kg of sericite powder, 30kg of rutile type titanium dioxide, 8kg of anionic carboxyl silicone oil emulsion, 3kg of PESO defoaming agent, 12kg of floating bead, 20kg of water, 3kg of dodecyl alcohol ester, 6kg of stearamide and 4kg of sodium carboxymethyl cellulose are accurately weighed by a weighing balance for later use. Wherein, the kaolin is weighed in the seasoning step.
Seasoning: and (3) pouring the kaolin into a crusher for crushing for 5 min. The crushed kaolin is sieved through a sieve with 60 meshes, and 10kg of the sieved kaolin is accurately weighed by a weighing balance for later use.
Pouring water into the first stirring kettle, uniformly and slowly scattering sodium carboxymethylcellulose into the first stirring kettle, and simultaneously starting the first stirring kettle for stirring. The stirring speed of the first stirring kettle is controlled at 1200r/min, the stirring time is 10min, and a first material is prepared for standby.
And sequentially pouring the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion and the dodecyl alcohol ester into a second stirring kettle, and raising the temperature in the second stirring kettle to 120 ℃ at the heating rate of 8 ℃/min by using a heating rod. And starting a second stirring kettle for stirring, wherein the stirring speed of the second stirring kettle is 800r/min, and the stirring time is 40min, so as to prepare a second material for later use.
Preparing materials: and when the temperature of the material II is reduced to 40 ℃, sequentially putting the material I, the sericite powder, the rutile type titanium dioxide, the PESO defoaming agent, the floating beads, the kaolin and the stearamide into a second stirring kettle for stirring. The stirring speed of the second stirring kettle is 3000r/min, and the stirring time is 60min, so as to prepare the coating.
Example 3
The preparation method of the reflective heat-insulating coating comprises the following preparation steps:
preparing materials: according to the formula ratio, accurately weighing 25kg of styrene-acrylic emulsion, 5kg of sericite powder, 20kg of rutile type titanium dioxide, 6kg of anionic carboxyl silicone oil emulsion, 2kg of PESO defoaming agent, 10kg of floating bead, 15kg of water, 2kg of dodecyl alcohol ester, 4kg of stearamide and 3kg of sodium carboxymethyl cellulose by using a weighing balance for later use. Wherein, the kaolin is weighed in the seasoning step.
Seasoning: and (3) pouring the kaolin into a crusher for crushing for 4 min. The crushed kaolin is sieved by a sieve with the mesh number of 50 meshes, and 8kg of the sieved kaolin is accurately weighed by a weighing balance for later use.
Pouring water into the first stirring kettle, uniformly and slowly scattering sodium carboxymethylcellulose into the first stirring kettle, and simultaneously starting the first stirring kettle for stirring. The stirring speed of the first stirring kettle is controlled at 1000r/min, the stirring time is 8min, and a first material is prepared for later use.
And sequentially pouring the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion and the dodecyl alcohol ester into a second stirring kettle, and raising the temperature in the second stirring kettle to 100 ℃ at a heating rate of 7 ℃/min by using a heating rod. And starting a second stirring kettle for stirring, wherein the stirring speed of the second stirring kettle is 700r/min, and the stirring time is 30min, so as to prepare a second material for later use.
Preparing materials: and when the temperature of the material II is reduced to 30 ℃, sequentially putting the material I, the sericite powder, the rutile type titanium dioxide, the PESO defoaming agent, the floating beads, the kaolin and the stearamide into a second stirring kettle for stirring. The stirring speed of the second stirring kettle is 2100r/min, and the stirring time is 45min, so as to prepare the coating.
Example 4
The preparation method of the reflective heat-insulating coating comprises the following preparation steps:
preparing materials: according to the formula ratio, accurately weighing 25kg of styrene-acrylic emulsion, 5kg of sericite powder, 20kg of rutile type titanium dioxide, 6kg of anionic carboxyl silicone oil emulsion, 2kg of PESO defoaming agent, 10kg of floating bead, 15kg of water, 2kg of dodecyl alcohol ester, 4kg of stearamide and 3kg of sodium carboxymethyl cellulose by using a weighing balance for later use. Wherein, the kaolin is weighed in the seasoning step.
Seasoning: and (3) pouring the kaolin into a crusher for crushing for 3 min. The crushed kaolin is sieved by a sieve with 40 meshes, and 8kg of the sieved kaolin is accurately weighed by a weighing balance for later use.
Pouring water into the first stirring kettle, uniformly and slowly scattering sodium carboxymethylcellulose into the first stirring kettle, and simultaneously starting the first stirring kettle for stirring. The stirring speed of the first stirring kettle is controlled at 800r/min, the stirring time is 5min, and a first material is prepared for later use.
And sequentially pouring the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion and the dodecyl alcohol ester into a second stirring kettle, and raising the temperature in the second stirring kettle to 80 ℃ at the heating rate of 5 ℃/min by using a heating rod. And starting a second stirring kettle for stirring, wherein the stirring speed of the second stirring kettle is 600r/min, and the stirring time is 20min, so as to prepare a second material for later use.
Preparing materials: and when the temperature of the material II is reduced to 20 ℃, sequentially putting the material I, the sericite powder, the rutile type titanium dioxide, the PESO defoaming agent, the floating beads, the kaolin and the stearamide into a second stirring kettle for stirring. The stirring speed of the second stirring kettle is 1200r/min, and the stirring time is 30min, so as to prepare the coating.
Example 5
The preparation method of the reflective heat-insulating coating comprises the following preparation steps:
preparing materials: according to the formula ratio, accurately weighing 25kg of styrene-acrylic emulsion, 5kg of sericite powder, 20kg of rutile type titanium dioxide, 6kg of anionic carboxyl silicone oil emulsion, 2kg of PESO defoaming agent, 10kg of floating bead, 15kg of water, 2kg of dodecyl alcohol ester, 4kg of stearamide and 3kg of sodium carboxymethyl cellulose by using a weighing balance for later use. Wherein, the kaolin is weighed in the seasoning step.
Seasoning: and (3) pouring the kaolin into a crusher for crushing for 5 min. The crushed kaolin is sieved through a sieve with 60 meshes, and 8kg of the sieved kaolin is accurately weighed by a weighing balance for later use.
Pouring water into the first stirring kettle, uniformly and slowly scattering sodium carboxymethylcellulose into the first stirring kettle, and simultaneously starting the first stirring kettle for stirring. The stirring speed of the first stirring kettle is controlled at 1200r/min, the stirring time is 10min, and a first material is prepared for standby.
And sequentially pouring the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion and the dodecyl alcohol ester into a second stirring kettle, and raising the temperature in the second stirring kettle to 120 ℃ at the heating rate of 8 ℃/min by using a heating rod. And starting a second stirring kettle for stirring, wherein the stirring speed of the second stirring kettle is 800r/min, and the stirring time is 40min, so as to prepare a second material for later use.
Preparing materials: and when the temperature of the material II is reduced to 40 ℃, sequentially putting the material I, the sericite powder, the rutile type titanium dioxide, the PESO defoaming agent, the floating beads, the kaolin and the stearamide into a second stirring kettle for stirring. The stirring speed of the second stirring kettle is 3000r/min, and the stirring time is 60min, so as to prepare the coating.
Example 6
Example 6 differs from example 3 in that: in example 6, in the step of preparing materials, the time for crushing the kaolin by the crusher is 3min, the crushed kaolin is sieved by a sieve with 40 meshes, and the rest is the same as that in example 3.
Example 7
Example 7 differs from example 3 in that: in example 7, in the step of preparing materials, the time for crushing the kaolin by the crusher is 5min, the crushed kaolin is sieved by a sieve with 60 meshes, and the rest is the same as that in example 3.
Example 8
Example 8 differs from example 3 in that: in example 8, in the seasoning step, the stirring speed of the first stirring kettle for stirring the sodium carboxymethylcellulose and the water is controlled to be 800r/min, the stirring time is controlled to be 5min, and the rest is consistent with that of example 3.
Example 9
Example 9 differs from example 3 in that: in example 9, the stirring speed of the first stirring kettle for stirring the sodium carboxymethylcellulose and the water is controlled at 1200r/min and the stirring time is controlled at 10min in the seasoning step, and the rest is consistent with that in example 3.
Example 10
Example 10 differs from example 3 in that: in example 10, in the seasoning step, the temperature in the second stirring vessel was raised to 80 ℃ at a rate of 5 ℃/min, and the rest was the same as in example 3.
Example 11
Example 11 differs from example 3 in that: in example 11, in the seasoning step, the temperature in the second stirring vessel was raised to 120 ℃ at a temperature rise rate of 8 ℃/min, and the rest was the same as in example 3.
Example 12
Example 12 differs from example 3 in that: in example 12, the stirring speed of the second stirring vessel in the seasoning step was 600r/min, the stirring time was 20min, and the rest was the same as in example 3.
Example 13
Example 13 differs from example 3 in that: in example 13, the stirring speed of the second stirring vessel in the seasoning step was 800r/min, the stirring time was 40min, and the rest was the same as in example 3.
Example 14
Example 14 differs from example 3 in that: in example 14, in the step of preparing the material, the temperature of the material II is reduced to 20 ℃, and the rest is consistent with that of example 3.
Example 15
Example 15 differs from example 3 in that: in example 15, in the step of preparing the material, the temperature of the material II is reduced to 40 ℃, and the rest is consistent with that of example 3.
Example 16
Example 16 differs from example 3 in that: in example 16, the stirring speed of the second stirring vessel in the material preparation step was 1200r/min, the stirring time was 30min, and the rest was the same as in example 3.
Example 17
Example 17 differs from example 3 in that: in example 17, the stirring speed of the second stirring vessel in the material preparation step was 3000r/min, the stirring time was 60min, and the rest was the same as in example 3.
Comparative example
Comparative example 1
A reflective thermal insulating coating sample was prepared according to the procedure of example one of the related art entitled publication No. CN 103865344B.
Comparative example 2
Comparative example 2 differs from example 3 in that: in comparative example 2, in the seasoning step, the temperature of the inner cavity of the second stirring vessel was raised to 60 ℃ and stirred at a rate of 500r/min for 10min to obtain a second material, and the remainder was the same as in example 3.
Comparative example 3
Comparative example 3 differs from example 3 in that: in comparative example 3, in the seasoning step, the temperature of the inner cavity of the second stirring vessel was raised to 150 ℃ and stirred at a speed of 1000r/min for 60min to obtain a second material, and the remainder was the same as in example 3.
Comparative example 4
Comparative example 4 differs from example 3 in that: in comparative example 4, in the preparation step, the second stirring vessel was stirred at 1000r/min for 20min to prepare a coating, and the remainder was the same as in example 3.
Comparative example 5
Comparative example 5 differs from example 3 in that: in comparative example 5, in the preparation step, the second stirring vessel was stirred at 4000r/min for 80min to prepare a coating, the remainder being identical to example 3.
Comparative example 6
Comparative example 6 differs from example 3 in that: in comparative example 6, the parts by weight of the styrene-acrylic emulsion was 10 parts, and the remainder was the same as in example 3.
Comparative example 7
Comparative example 7 differs from example 3 in that: in comparative example 7, the parts by weight of the styrene-acrylic emulsion was 40 parts, and the remainder was the same as in example 3.
Performance test
The coatings prepared in examples 1 to 17 and comparative examples 1 to 7 were observed and examined according to the national standard GB/T25261-2018 reflective thermal insulating coating for buildings.
The coatings prepared in examples 1 to 17 and comparative examples 1 to 7 were applied to the outer surface of the workpiece, respectively, to a thickness of 1 mm. Firstly, respectively putting a workpiece coated with paint into water at the temperature of 23 +/-2 ℃ for soaking for 18 h; then, taking out the workpiece and putting the workpiece into a freezing chamber with the temperature of minus 20 +/-2) DEG for freezing for 3 h; and finally, putting the workpiece into an oven at 50 +/-2 ℃ for heating for 3 hours. The three steps are a flow, after circulation is carried out for three times, the workpiece is placed at room temperature, and whether the coating has the coating ill-conditioned phenomena such as pulverization, cracking, bubbling and peeling is observed by naked eyes. If not, the evaluation is no abnormality. The temperature change resistance results of the coating are shown in table one.
Temperature change resistant watch with first coating
As can be seen from the table I, the coating prepared by the preparation method disclosed by the application is superior to the coating prepared by the comparative example in the detection result of temperature deformation resistance. Therefore, the coating prepared by the preparation method disclosed by the application has the effects of stable film layer structure, good temperature difference resistance effect and capability of ensuring the use stability of the coating after long-time use.
The thermal conductivity of the coatings prepared in examples 1 to 17 and comparative examples 1 to 7 was measured by a rapid thermal conductivity measuring instrument by the following method: fitting the workpiece coated with the coating on a heat surface source of a rapid heat conductivity coefficient tester, and testing the real-time heat flow temperature of one side of the workpiece, which is far away from the heat surface source, through a test piece of the tester; the operator can read the thermal conductivity directly from the instrument and record it. The unit of the thermal conductivity is [ W/(m.K) ], when the thermal conductivity is less than or equal to 0.08[ W/(m.K) ], the heat preservation effect is defined as excellent; when the thermal conductivity coefficient is more than 0.08 and less than or equal to 0.15 (W/(m.K)), the heat preservation effect is defined as good; when the thermal conductivity is more than 0.15[ W/(mK) ], the heat-insulating effect is defined as general. The thermal conductivity test results of the coating are shown in table two.
Heat conductivity coefficient detecting meter for secondary coating
| Thermal conductivity [ W/(m. K)] | Heat preservation effect | |
| Example 1 | 0.07 | Is excellent in |
| Example 2 | 0.05 | Is excellent in |
| Example 3 | 0.04 | Is excellent in |
| Example 4 | 0.06 | Is excellent in |
| Example 5 | 0.07 | Is excellent in |
| Example 6 | 0.06 | Is excellent in |
| Example 7 | 0.08 | Is excellent in |
| Example 8 | 0.06 | Is excellent in |
| Example 9 | 0.05 | Is excellent in |
| Example 10 | 0.08 | Is excellent in |
| Example 11 | 0.06 | Is excellent in |
| Example 12 | 0.07 | Is excellent in |
| Example 13 | 0.07 | Is excellent in |
| Example 14 | 0.08 | Is excellent in |
| Example 15 | 0.06 | Is excellent in |
| Example 16 | 0.08 | Is excellent in |
| Example 17 | 0.07 | Is excellent in |
| Comparative example 1 | 0.23 | In general |
| Comparative example 2 | 0.11 | Good effect |
| Comparative example 3 | 0.09 | Good effect |
| Comparative example 4 | 0.09 | Good effect |
| Comparative example 5 | 0.10 | Good effect |
| Comparative example 6 | 0.19 | In general |
| Comparative example 7 | 0.17 | In general |
As can be seen from the second table, the paint prepared by the preparation method disclosed by the application is smaller than the paint prepared by the comparative example in the detection data of the thermal conductivity coefficient, and is better than the paint prepared by the comparative example in the heat preservation effect. Therefore, the coating prepared by the preparation method disclosed by the application has the advantages of lower thermal conductivity and better thermal insulation performance, and can play a good thermal insulation protection effect on the coated workpiece.
Meanwhile, by analyzing the data in the second table, the following results can be obtained: by taking the example 3 as a contrast, the low temperature and the slow temperature rise rate of the raw materials during the stirring process affect the forming quality of the coating, and cause the phenomenon that the thermal conductivity of the coating is relatively high. It can be seen again from comparative examples 2 and 3 and comparative example 3 that the lower the temperature at which the material is stirred, the higher the thermal conductivity of the formed coating material, which in turn leads to unstable quality of the formed coating material and the more likely to cause the coating film to be ill-conditioned.
Compared with the comparative examples 6 and 7 and the comparative example 3, the heat conductivity coefficient of the coating film is greatly improved when the addition amount of the styrene-acrylic emulsion is too much or too little, and the heat insulation performance of the coating film is poorer; and when the input amount of the styrene-acrylic emulsion is relatively low, the heat conductivity coefficient of the formed coating is higher, and the coating is more prone to pathological phenomena by combining the temperature difference deformation condition of the coating shown in the specification.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A reflective thermal insulation coating is characterized in that: the coating is prepared from the following raw materials in parts by weight:
20-30 parts of styrene-acrylic emulsion, 2-8 parts of sericite powder, 10-30 parts of rutile titanium dioxide, 4-8 parts of anionic carboxyl silicone oil emulsion, 1-3 parts of PESO defoaming agent, 8-12 parts of floating beads, 6-10 parts of kaolin and 10-20 parts of water.
2. The reflective thermal insulating coating according to claim 1, wherein: the paint also comprises 1-3 parts of film-forming additive by weight, wherein the film-forming additive is dodecyl alcohol ester.
3. The reflective thermal insulating coating according to claim 1, wherein: the coating also comprises 2-6 parts by weight of a dispersant, wherein the dispersant is stearamide.
4. The reflective thermal insulating coating according to claim 1, wherein: the coating also comprises 2-4 parts by weight of a thickening agent, wherein the thickening agent is sodium carboxymethyl cellulose.
5. The method for preparing a reflective insulation coating according to any one of claims 1 to 4, wherein: the preparation method comprises the following preparation steps: preparing materials: accurately weighing all the raw materials according to the formula ratio for later use; seasoning: pouring all the sodium carboxymethylcellulose into a container filled with water, and uniformly stirring to obtain a first material for later use; pouring all the styrene-acrylic emulsion, the anionic carboxyl silicone oil emulsion and the dodecyl alcohol ester into a container, raising the temperature of an inner cavity of the container to 80-120 ℃, and stirring at the speed of 600-800 r/min for 20-40min to prepare a second material for later use; preparing materials: and putting the first material, sericite powder, rutile type titanium dioxide, a PESO defoaming agent, floating beads, kaolin and stearamide into the second material, and stirring at the stirring speed of 1200-3000 r/min for 30-60min to obtain the coating.
6. The preparation method of the reflective insulation coating according to claim 5, wherein: the preparation steps are added with the following steps: crushing the kaolin by using crushing equipment for 3-5min, and screening the crushed kaolin with 40-60 meshes.
7. The preparation method of the reflective insulation coating according to claim 5, wherein: the seasoning step comprises: the stirring speed of the stirring device of the container to the sodium carboxymethylcellulose and the water is 800-.
8. The method for preparing the reflective insulation coating according to claim 7, wherein the method comprises the following steps: the seasoning step comprises: the temperature rise rate of the second material is 5-8 ℃/min.
9. The preparation method of the reflective insulation coating according to claim 5, wherein: the following steps are added in the material preparation step: the second material is cooled to 20-40 ℃ before being stirred.
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Application publication date: 20210625 |