CN108751900B - High-performance reflective heat-insulation gypsum-based composite heat-insulation material and preparation method thereof - Google Patents
High-performance reflective heat-insulation gypsum-based composite heat-insulation material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a high-performance reflective heat-insulation gypsum-based composite heat-insulation material and a preparation method thereof, belongs to the technical field of building heat-insulation materials and preparation thereof, and aims to solve the problem that the building heat-insulation material in the prior art is poor in use durability. The key point of the technical scheme is that the heat insulation material comprises the following components in parts by weight: 600 parts of gypsum, 500 parts of quartz sand, 100 parts of heat-insulating light aggregate, 3-5 parts of modified methyl cellulose, 5-10 parts of a water reducing agent, 6-15 parts of latex powder and 1-15 parts of anti-cracking fiber. All the components are powder or granular materials and do not contain components which can react with gypsum to generate sodium sulfate, and the product has the advantages of good reflection and heat insulation performance, good use durability, convenient use and low manufacturing cost. The invention correspondingly discloses a preparation method of the heat-insulating material, the method is simple in process, and the prepared heat-insulating material has extremely low thermal conductivity, higher sunlight reflectivity and near-infrared reflectance, and good water resistance, weather resistance and use durability.
Description
Technical Field
The invention belongs to the technical field of building heat-insulating materials and preparation thereof, and particularly relates to a high-performance reflective heat-insulating gypsum-based composite heat-insulating material and a preparation method thereof.
Background
The building heat-insulating material can be used for reducing heat loss of indoor and outdoor environments of a building and effectively reducing air conditioning load of the building, is an important component for building and implementing energy-saving reconstruction, but has the defect of poor waterproofness, so that the further development and application of the building heat-insulating material are limited. In turn, a novel energy-saving building thermal insulation material with moisture-proof development places is urgently needed.
The application publication No. CN104556927A discloses a heat insulation material, which is an improvement aiming at the current situations of insufficient binding power and poor hydrophobic effect of the heat insulation material in the prior art, and discloses a hydrophobic heat insulation material. The patent enhances the hydrophobic property of the heat-insulating material by adding a water repellent into the heat-insulating material. Although the addition of the water repellent can achieve a certain water repellent effect, when the addition amount of the water repellent reaches the maximum effective value, the flexural strength of the heat-insulating material is further reduced, and the service performance of the heat-insulating material is affected.
In order to solve the problems and further improve the water resistance of the heat insulation material, the Chinese patent with application publication No. CN106316320A discloses a moisture-resistant gypsum-based composite heat insulation material and a preparation method thereof, wherein hydrophobic expanded perlite, a binder, organic montmorillonite and methyl triethoxysilane are added into raw materials to increase the hydrophobicity of the heat insulation material and improve the bonding strength. The used binder is water glass or palygorskite.
However, sodium sulfate is produced by the reaction of water glass and gypsum, the thermal insulation material is easy to rain or absorb moisture when being used for building outer walls, and a large amount of sodium ions can be ionized due to the existence of sodium sulfate after the thermal insulation material absorbs water. Sodium ions have high affinity to water, and easily permeate into gaps among expanded perlite, aggregate and condensed material in the presence of water, so that the service energy of the heat-insulating material is influenced. After the heat-insulating material is exposed to the sun, water is evaporated, sodium sulfate is separated out in the form of crystalline salt, the volume is increased, micro cracks or holes are generated on the expanded perlite or the aggregate, and even the expanded perlite or the aggregate is crushed, so that the service durability and the weather resistance of the heat-insulating material are poor.
Therefore, how to develop a building wall thermal insulation material with good water resistance and good use durability is a problem to be solved in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-performance reflective heat-insulation gypsum-based composite heat-insulation material which has the advantages of good water resistance, good use durability and good reflective heat-insulation performance.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-performance reflective heat-insulation gypsum-based composite heat-insulation material is a dry powder mixture and comprises the following components in parts by weight,
400 portions of gypsum
500 portions of quartz sand 250-
Thermal insulation light aggregate 100 plus 150 parts
3-5 parts of modified methyl cellulose
5-10 parts of water reducing agent
6-15 parts of latex powder
1-15 parts of anti-cracking fiber.
By adopting the technical scheme, the method at least has the following advantages: 1. the water glass is not added in the formula, the sodium sulfate can not be generated by reaction with gypsum, the water can not permeate into the micro-cracks of the quartz sand and the heat-preservation and heat-insulation light aggregate due to the existence of the sodium sulfate in the long-term use process, and a large number of micro-cracks and holes are not easy to generate due to repeated crystallization and swelling, so that the long-term use performance of the heat-preservation material is slightly influenced by the water. 2. The heat-insulating material with the specific material proportion is a powdery mixture, and the heat-insulating material can be prepared by adding water and stirring during construction, and has the advantages of convenience in storage, transportation and construction. 3. The heat-insulating material with the specific material ratio has extremely low heat conductivity coefficient and high reflectivity to sunlight, and the heat-insulating effect of the heat-insulating material is superior to that of the same type of products sold in the market. 4. The modified methyl cellulose has better salt resistance and more stable performance than methyl cellulose, and the mixed amount of the modified methyl cellulose can increase the water retention of the thermal insulation material and has the effect of improving the construction performance of the thermal insulation material. 5. The latex powder can form a polymer film in the hardening process of the heat-insulating material, and a spatial three-dimensional net structure formed by the long molecular chains can coat quartz sand and heat-insulating light aggregate, so that the bonding strength is improved, the shrinkage rate is reduced, and the latex powder also has the effects of adjusting the consistency and the water-retaining property of the heat-insulating material. 6. The anti-cracking fibers are uniformly dispersed and criss-cross in the heat insulation material, can block and limit the expansion of micro cracks, and play a role in cracking resistance and improving durability.
Further, the quartz sand is quartz sand with 80-180 mesh-grade particle size.
By adopting the technical scheme, the quartz sand has overlarge particle size, is easy to crush in the stirring process, and is easy to crack due to environmental factors such as insolation and low temperature after construction, so that the service performance of the heat-insulating material is influenced; the particle size is too small, and the strength of the heat-insulating material is poor, so that the particle size is optimally 80-180 meshes. The heat-insulating material prepared from the quartz sand with the grading mesh number has high strength and good durability, and the surface of the heat-insulating material layer after construction is smooth.
Further, the quartz sand is processed by the following process,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 85-100 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with 80-180 mesh size for later use.
By adopting the technical scheme, the quartz sand treated by the specific process has excellent hydrophobicity, is not easy to absorb water, is not easy to crack due to heating/freezing and the like caused by the existence of salt in the heat-insulating material or climate change, and has excellent use durability.
Furthermore, the heat-insulating light aggregate is one or more of hollow glass beads, vitrified micro-beads and expanded perlite, and the particle size of the heat-insulating light aggregate is 2-200 mu m.
By adopting the technical scheme, the hollow glass beads, the vitrified micro bubbles and the expanded perlite have microporous structures inside, the heat conductivity coefficient is extremely low, and the heat-insulating and sound-insulating effects are excellent. When the particle size of the heat-insulating material is larger than 200 mu m, the content of the heat-insulating material is easy to disperse and uneven, and the space between adjacent heat-insulating material particles is large, so that the heat-conducting property of each part of the heat-insulating material is uneven, and the heat-insulating effect is influenced; when the particle size of the heat-insulating material is less than 2 mu m, the specific surface area of the heat-insulating material is large, the phenomenon of moisture absorption and aggregation is easy to occur during mixing in construction, and the construction property of the heat-insulating material is reduced. The heat preservation and insulation performance of the heat preservation material and the dispersion uniformity of the heat preservation and insulation light aggregate during preparation are comprehensively considered, and the particle size of the heat preservation and insulation material is optimal to be 2-200 mu m.
Further, the true density of the heat-insulating light aggregate is 0.1-0.9g/cm3。
By adopting the technical scheme, the true density is more than 0.9g/cm3The heat insulation performance of the heat insulation light aggregate is not ideal; density lower than 0.1g/cm3The heat-insulating light aggregate is easy to float and delaminate when being mixed with water, is not easy to be mixed uniformly and has poor construction performance.
Further, the modified methylcellulose is hydroxyethyl methylcellulose ether or hydroxypropyl methylcellulose ether.
By adopting the technical scheme, the hydroxyethyl methyl cellulose ether obtained by introducing ethylene oxide modification into methyl cellulose molecules, and the hydroxypropyl methyl cellulose ether obtained by introducing propylene oxide modification have better salt resistance and more stable performance than methyl cellulose. And when the heat-insulating material is stirred by adding water, the hydroxyethyl methyl cellulose ether and the hydroxypropyl methyl cellulose ether have good water-retaining property, the hardening of the heat-insulating material is delayed, the operation time is enough, the construction property is good, and the heat-insulating material is not cracked due to too fast drying after being coated, so that the hardened strength is increased. In the hardening process of the heat-insulating material, the long molecular chains of the hydroxyethyl methyl cellulose membrane and the hydroxypropyl methyl cellulose ether can form a complex spatial three-dimensional reticular structure in a heat-insulating material system, and play a role in reducing the floating and layering of the heat-insulating light aggregate and reducing the precipitation and segregation of quartz sand. In addition, the modified methyl cellulose can also be used as a thickening agent and a binder, and has the synergistic effect with latex powder, so that the bonding strength of the material is improved, and the shrinkage rate is reduced.
Further, the viscosity of the modified methylcellulose is 30000-200000 mPas.
By adopting the technical scheme, the modified methyl cellulose with low viscosity has poor effects of water retention, inhibition of floating and layering of the heat-preservation and heat-insulation light aggregate and reduction of quartz sand precipitation and segregation, so that the viscosity of the modified methyl cellulose is preferably 30000-200000 mPa. The thermal insulation material prepared from the viscosity modified methyl cellulose has excellent and uniform thermal insulation performance and excellent application property.
Further, the water reducing agent is one or more of a powdery naphthalene sulfonate high-efficiency water reducing agent, a sulfamate high-efficiency water reducing agent or a polycarboxylic acid high-efficiency water reducing agent; the latex powder is polyvinyl acetate or polyacrylate; the anti-cracking fiber is a polyethylene fiber with the length of 3-6mm or a wood fiber with the length of 100-200 mu m.
By adopting the technical scheme, the naphthalene sulfonate high-efficiency water reducing agent, the sulfamate high-efficiency water reducing agent or the polycarboxylic acid high-efficiency water reducing agent can effectively reduce the mixing water consumption of the heat-insulating material, and the heat-insulating light aggregate floating seal layer and the quartz sand precipitation segregation which are caused by large mixing water consumption are not easy to occur. The polyvinyl acetate can be dispersed in water, the adhesive force between the heat-insulating material and the base layer of the construction wall body is improved, and the polyvinyl acetate has good flexibility; the polyacrylate emulsion powder can improve the caking property of the heat-insulating material, improve the flexibility of a heat-insulating material system, reduce cracking, reduce water absorption and improve the weather resistance and long-term stability of a heat-insulating system.
The invention also aims to provide a preparation method of the high-performance reflective heat-insulation gypsum-based composite heat-insulation material, which has the characteristic of simple process, and the prepared heat-insulation material has the advantages of convenience in use, good heat-insulation performance and good use durability.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps,
step one, weighing 400 parts by weight of gypsum, 500 parts by weight of quartz sand, 150 parts by weight of heat-insulating light aggregate, 3-5 parts by weight of modified methyl cellulose, 5-10 parts by weight of water reducing agent, 6-15 parts by weight of emulsion powder and 1-15 parts by weight of anti-cracking fiber;
firstly, adding gypsum, quartz sand and anti-cracking fibers into a mixer and stirring uniformly;
adding latex powder, a water reducing agent and modified methyl cellulose into the internal mixer, and continuing stirring;
and step four, finally adding the heat-preservation and heat-insulation light aggregate into the mixer, stirring for 30min at the rotating speed of 800 plus material 1000rpm, and discharging.
By adopting the technical scheme, the method at least has the following advantages: 1. the process is simple, and the heat-insulating material can be obtained by only adding the components according to the sequence of the steps and uniformly stirring and mixing. 2. The powdery raw materials are selected for preparation, the prepared finished product has stable performance and is easier to store and transport, and the finished product is prepared by adding water and mixing during construction. 3. And finally, adding the heat-insulating light aggregate, wherein the light aggregate can be uniformly dispersed by stirring at low speed for a short time due to good fluidity of the light aggregate, so that the light aggregate is not easy to be crushed by stirring to influence the heat-insulating property of the light aggregate.
Further, the quartz sand is processed by the following process,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 85-100 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with 80-180 mesh size for later use.
By adopting the technical scheme, the hydrophobicity of the quartz sand is greatly increased, the quartz sand is not easy to absorb water, the quartz sand is not easy to crack due to heating/freezing caused by the existence of salt in the heat-insulating material or climate change, and the service durability is excellent.
In conclusion, the invention has the following beneficial effects:
1. the water glass is not added in the formula, so that sodium sulfate can not be generated by reaction with gypsum, moisture can not permeate into the micro-cracks of the quartz sand and the heat-insulating light aggregate due to the existence of the sodium sulfate in the long-term use process, and a large number of micro-cracks and holes are not easy to generate due to repeated crystallization and swelling, so that the long-term use performance of the heat-insulating material is slightly influenced by the moisture;
2. the heat-insulating material with a specific material proportion is a powdery mixture, and the heat-insulating material can be prepared by adding water and stirring during construction, and has the advantages of convenience in storage, transportation and construction;
3. the heat-insulating material with specific material ratio has extremely low heat conductivity coefficient and high reflectivity to sunlight, and the heat-insulating effect of the heat-insulating material is superior to that of the same type of products sold in the market;
4. the salt resistance of the modified methyl cellulose is better than that of methyl cellulose, the performance is more stable, the specific mixing amount of the modified methyl cellulose can increase the water retention of the heat-insulating material, and the heat-insulating material has the effect of improving the construction performance of the heat-insulating material;
5. the latex powder can form a polymer film in the hardening process of the heat-insulating material, and a spatial three-dimensional net structure formed by long molecular chains of the latex powder can coat quartz sand and heat-insulating light aggregate, so that the bonding strength is improved, the shrinkage rate is reduced, and the latex powder also has the effects of adjusting the consistency and the water-retaining property of the heat-insulating material;
6. the anti-cracking fibers are uniformly dispersed and criss-cross in the heat insulation material, can block and limit the expansion of micro cracks, and play a role in cracking resistance and improving durability;
7. the high-performance reflective heat-insulation gypsum-based composite heat-insulation material has the characteristics of simple process and capability of reducing the damage to the heat-insulation light aggregate in the mixing process to the maximum extent, and the prepared finished product has stable performance and is easier to store and transport;
8. the organic silicon emulsion is sprayed on the surface of the quartz sand, and then the quartz sand is baked at the temperature of 85-100 ℃, so that the hydrophobicity of the quartz sand is greatly increased, the quartz sand is not easy to absorb water, is not easy to crack due to heating/freezing caused by the existence of salt in a heat-insulating material or climate change, and has excellent use durability.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples 1 to 9:
examples 1 to 9 all relate to a high-performance reflective heat-insulating gypsum-based composite heat-insulating material, and the contents of the components in parts by weight are shown in the following table:
the grading particle size of the quartz sand, the particle size of the heat-preservation and heat-insulation light aggregate, the true density of the heat-preservation and heat-insulation light aggregate, the viscosity of the modified methyl cellulose and the length parameters of the anti-cracking fiber in each example are shown in the following table:
example 10
A high performance reflective thermal insulation gypsum-based composite thermal insulation material based on example 1, with the difference that: the quartz sand is subjected to hydrophobic treatment, the specific treatment process is as follows,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 85 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with 80-mesh-grade grain size for later use.
Example 11
A high performance reflective thermal insulation gypsum-based composite thermal insulation material based on example 2, with the difference that: the quartz sand is subjected to hydrophobic treatment, the specific treatment process is as follows,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 95 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with the grain size of 120 meshes for later use.
Example 12
A high performance reflective thermal insulation gypsum-based composite thermal insulation material based on example 3, with the difference that: the quartz sand is subjected to hydrophobic treatment, the specific treatment process is as follows,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 100 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with the grain size of 180 meshes for later use.
Example 13
A high performance reflective thermal insulation gypsum-based composite thermal insulation material based on example 4, with the difference that: the quartz sand is subjected to hydrophobic treatment, the specific treatment process is as follows,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 85 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with 80-mesh-grade grain size for later use.
Example 14
A high performance reflective thermal insulation gypsum-based composite thermal insulation material based on example 5, with the difference that: the quartz sand is subjected to hydrophobic treatment, the specific treatment process is as follows,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 95 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with the grain size of 120 meshes for later use.
Example 15
A high performance reflective thermal insulation gypsum-based composite thermal insulation material based on example 6, with the difference that: the quartz sand is subjected to hydrophobic treatment, the specific treatment process is as follows,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand treated by the step P1 at the temperature of 100 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
and P3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with the grain size of 180 meshes for later use.
Example 16
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
weighing the components in the embodiment 1 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
thirdly, adding polyvinyl acetate latex powder, a naphthalene sulfonate high-efficiency water reducing agent and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads into the powder mixing stirrer, stirring for 30min at the rotating speed of 800rpm, and discharging.
Example 17
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 2 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the wood fiber into a powder mixing stirrer and stirring uniformly;
thirdly, adding polyvinyl acetate emulsion powder, sulfamate high-efficiency water reducing agent and hydroxypropyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the expanded perlite into the powder mixing stirrer, stirring at the rotating speed of 900rpm for 30min, and discharging.
Example 18
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 3 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
thirdly, adding polyvinyl acetate emulsion powder, a polycarboxylic acid high-efficiency water reducing agent, hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the vitrified micro bubbles into the powder mixing stirrer, stirring at the rotating speed of 1000rpm for 30min, and discharging.
Example 19
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 4 according to parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
adding polyacrylate emulsion powder, a naphthalene sulfonate high-efficiency water reducing agent and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads into the powder mixing stirrer, stirring for 30min at the rotating speed of 800rpm, and discharging.
Example 20
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 5 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the wood fiber into a powder mixing stirrer and stirring uniformly;
adding polyacrylate emulsion powder, sulfamate high-efficiency water reducing agent and hydroxypropyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the expanded perlite into the powder mixing stirrer, stirring at the rotating speed of 900rpm for 30min, and discharging.
Example 21
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 6 according to the parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
adding polyacrylate emulsion powder, a polycarboxylic acid high-efficiency water reducing agent, hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the vitrified micro bubbles into the powder mixing stirrer, stirring at the rotating speed of 1000rpm for 30min, and discharging.
Example 22
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 7 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
thirdly, adding polyvinyl acetate latex powder, a naphthalene sulfonate high-efficiency water reducing agent and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads into the powder mixing stirrer, stirring at the rotating speed of 850rpm for 30min, and discharging.
Example 23
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 8 according to the parts by weight, wherein the components are powder or granules;
step two, firstly, adding high-strength gypsum, quartz sand and polyethylene fibers into a powder mixing stirrer and stirring uniformly;
adding polyacrylate emulsion powder, sulfamate high-efficiency water reducing agent and hydroxypropyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads into the powder mixing stirrer, stirring for 30min at the rotating speed of 950rpm, and discharging.
Example 24
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 9 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the desulfurized gypsum, the quartz sand and the wood fiber into a powder mixing stirrer and stirring uniformly;
thirdly, adding polyvinyl acetate emulsion powder, polycarboxylic acid high-efficiency water reducing agent and hydroxypropyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the expanded perlite and the vitrified micro bubbles into the powder mixing stirrer, stirring at the rotating speed of 1000rpm for 30min, and discharging.
Example 25
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 10 according to the parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
thirdly, adding polyvinyl acetate latex powder, a naphthalene sulfonate high-efficiency water reducing agent and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads into the powder mixing stirrer, stirring for 30min at the rotating speed of 800rpm, and discharging.
Example 26
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 11 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the wood fiber into a powder mixing stirrer and stirring uniformly;
thirdly, adding polyvinyl acetate emulsion powder, sulfamate high-efficiency water reducing agent and hydroxypropyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the expanded perlite into the powder mixing stirrer, stirring at the rotating speed of 900rpm for 30min, and discharging.
Example 27
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 12 in parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
thirdly, adding polyvinyl acetate emulsion powder, a polycarboxylic acid high-efficiency water reducing agent, hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the vitrified micro bubbles into the powder mixing stirrer, stirring at the rotating speed of 1000rpm for 30min, and discharging.
Example 28
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 13 according to the parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
adding polyacrylate emulsion powder, a naphthalene sulfonate high-efficiency water reducing agent and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads into the powder mixing stirrer, stirring for 30min at the rotating speed of 800rpm, and discharging.
Example 29
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 14 according to the parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the wood fiber into a powder mixing stirrer and stirring uniformly;
adding polyacrylate emulsion powder, sulfamate high-efficiency water reducing agent and hydroxypropyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the expanded perlite into the powder mixing stirrer, stirring at the rotating speed of 900rpm for 30min, and discharging.
Example 30
A preparation method of a high-performance reflective heat-insulation gypsum-based composite heat-insulation material comprises the following steps:
step one, weighing the components in the embodiment 15 according to the parts by weight, wherein the components are powder or granules;
step two, firstly, adding the semi-hydrated gypsum, the quartz sand and the polyethylene fiber into a powder mixing stirrer to be stirred uniformly;
adding polyacrylate emulsion powder, a polycarboxylic acid high-efficiency water reducing agent, hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether into the powder mixing stirrer, and continuing stirring;
and step four, finally adding the hollow glass beads and the vitrified micro bubbles into the powder mixing stirrer, stirring at the rotating speed of 1000rpm for 30min, and discharging.
Performance testing
Examples 10 to 12 having application publication No. CN106316320A and entitled "a moisture-resistant gypsum-based composite thermal insulation material and a method for producing the same" were comparative examples 1 to 3.
The high-performance reflective heat-insulation gypsum-based composite heat-insulation materials prepared by the methods of the embodiments 16 to 30 of the invention are respectively used as samples 1 to 15.
The performance of samples 1-15 and comparative examples 1-3 were tested with reference to DB 31/T895-2015 application technical Specification for reflective thermal insulation coating and desulfurized gypsum lightweight aggregate mortar thermal insulation system, and the test results are shown in the following table:
comparing the data in tables 3, 4 and 5, it can be seen that the high performance reflective insulation gypsum-based composite thermal insulation material or the high performance reflective insulation gypsum-based composite thermal insulation coating material prepared by the method of the present invention has a thermal conductivity as low as 0.030W/(m.K), a solar reflectance of more than 65%, a near-infrared reflectance of more than 0.79, and good reflective insulation properties. And on the premise of not adding a binder, methyltriethoxysilane and organic montmorillonite, the dry strength, compressive alkali bonding strength, thermal conductivity coefficient, solar reflectance and near infrared reflectance all reach the same degree or better than that of the control example (CN 106316320A). The high-performance reflective heat-insulation gypsum-based composite heat-insulation material or the high-performance reflective heat-insulation gypsum-based composite bag heat-insulation material prepared by the method has excellent performance and lower production and manufacturing cost.
The water absorption by volume of the control examples 1 to 3, the samples 1 to 6 and the samples 10 to 15 was measured with reference to DG/TJ 08-2088-:
from the test data in table 6, it can be seen that the high performance reflective insulation gypsum-based composite thermal insulation material of the present invention or the high performance reflective insulation gypsum-based composite bag thermal insulation material prepared by the method of the present invention has a lower volume water absorption than the comparative example (CN 106316320A) and better water resistance. Meanwhile, the experimental data of the comparative samples 1-6 and 10-15 show that the volume water absorption of the heat-insulating material is obviously reduced after the quartz sand is subjected to the spraying-baking treatment of the organic silicon emulsion. In addition, because the formula is not doped with water glass capable of reacting with gypsum to generate sodium sulfate, the high-performance reflective heat-insulation gypsum-based composite heat-insulation material or the high-performance reflective heat-insulation gypsum-based composite bag heat-insulation material prepared by the method can endure washing and dipping of rainwater for a long time after construction. The water is not easy to enter into the microcracks on the surfaces of the quartz sand and the heat-insulating material or even the inside of the quartz sand and the heat-insulating material due to the existence of sodium ions (ionized after the hydrolysis of sodium sulfate), so that the expansion of the microcracks on the surfaces of the quartz sand and the heat-insulating material caused by the expansion of inorganic salt crystals after the water is evaporated is reduced, the quartz sand and the heat-insulating material are not easy to crack, and the use durability and the weather resistance of the heat-insulating material are positively influenced.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (5)
1. The high-performance reflective heat-insulation gypsum-based composite heat-insulation material is characterized in that: is a dry powder mixture and is prepared by the following components in parts by weight,
500 portions of semi-hydrated gypsum and 600 portions of
500 portions of quartz sand 380-
Thermal insulation light aggregate 130 and 150 parts
4-5 parts of modified methyl cellulose
8-10 parts of water reducing agent
10-15 parts of latex powder
8-15 parts of anti-cracking fiber;
the quartz sand is 120-180-mesh-grade quartz sand with a particle size, and is treated by the following process,
p1, uniformly spraying organic silicon emulsion with the mass percentage concentration of 3% on the surface of the quartz sand, wherein the mass ratio of the spraying amount of the organic silicon emulsion to the quartz sand is 1: 1;
p2, baking the quartz sand processed by the step P1 at the temperature of 95-100 ℃ until the sprayed organic silicon emulsion is completely dried and solidified;
p3, naturally cooling the quartz sand treated by the step P2 to room temperature, and sieving to obtain the quartz sand with the grain size of 120-180 meshes for later use;
the heat-insulating light aggregate is one or more of hollow glass beads, vitrified micro bubbles and expanded perlite, the particle size of the heat-insulating light aggregate is 100-200 mu m, and the true density of the heat-insulating light aggregate is 0.5-0.9g/cm3。
2. The high performance reflective insulating gypsum-based composite thermal insulation material of claim 1, wherein: the modified methyl cellulose is hydroxyethyl methyl cellulose ether or hydroxypropyl methyl cellulose ether.
3. The high performance reflective insulating gypsum-based composite thermal insulation material of claim 2, wherein: the viscosity of the modified methylcellulose is 30000-200000 mPas.
4. The high performance reflective insulating gypsum-based composite thermal insulation material of claim 1, wherein: the water reducing agent is one or more of a powdery naphthalene sulfonate high-efficiency water reducing agent, a powdery sulfamate high-efficiency water reducing agent or a powdery polycarboxylic acid high-efficiency water reducing agent; the latex powder is polyvinyl acetate or polyacrylate; the anti-cracking fiber is a polyethylene fiber with the length of 3-6mm or a wood fiber with the length of 100-200 mu m.
5. A method for preparing the high-performance reflective thermal insulation gypsum-based composite thermal insulation material according to claim 1, which is characterized in that: comprises the following steps of (a) carrying out,
step one, weighing 500 parts of semi-hydrated gypsum, 500 parts of 380 parts of quartz sand, 150 parts of 130 parts of heat-insulating light aggregate, 4-5 parts of modified methyl cellulose, 8-10 parts of a water reducing agent, 10-15 parts of latex powder and 8-15 parts of anti-cracking fiber according to parts by weight;
firstly, adding the semi-hydrated gypsum, the quartz sand and the anti-cracking fiber into a mixer and stirring the mixture uniformly;
adding the latex powder, the water reducing agent and the modified methyl cellulose into the mixer, and continuing stirring;
and step four, finally adding the heat-preservation and heat-insulation light aggregate into the mixer, stirring for 30min at the rotating speed of 800 plus material 1000rpm, and discharging.
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| CN109776061B (en) * | 2019-04-03 | 2021-05-04 | 重庆建大建筑材料有限公司 | Light high-strength type external wall internal thermal insulation gypsum and preparation method thereof |
| CN111606686A (en) * | 2020-05-22 | 2020-09-01 | 大厂金隅涂料有限责任公司 | Flame-retardant heat-preservation heat-insulation coating and preparation method thereof |
| CN111592316A (en) * | 2020-05-25 | 2020-08-28 | 贵州省昊越新型材料科技有限公司 | Gypsum heat-insulating mortar |
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