CN112159246A - Preparation method of cement-based building exterior wall thermal insulation material - Google Patents

Preparation method of cement-based building exterior wall thermal insulation material Download PDF

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CN112159246A
CN112159246A CN202011088773.1A CN202011088773A CN112159246A CN 112159246 A CN112159246 A CN 112159246A CN 202011088773 A CN202011088773 A CN 202011088773A CN 112159246 A CN112159246 A CN 112159246A
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cement
parts
nano
silica
exterior wall
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刘俊
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Hangzhou Mitu Smart Home Technology Co ltd
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Hangzhou Mitu Smart Home Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40—Porous or lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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

Abstract

The invention belongs to the technical field of building materials, and discloses a preparation method of a cement-based building exterior wall thermal insulation material. The preparation method comprises the following steps: (1) uniformly stirring the nano-silica and the diatomite in a stirrer to obtain pretreated nano-silica; (2) mixing portland cement, fly ash, EVA (ethylene-vinyl acetate copolymer) redispersible latex powder and pretreated nano-silica to obtain a modified cement base; (3) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding modified cement base, and stirring to obtain cement base slurry; (4) adding the aqueous solution of hydrogen peroxide into the cement-based slurry, stirring, curing and forming. The inventionThe preparation method comprises adding diatomite to weaken agglomeration of nano-silica, and adding polyethylene ester type epoxy resin and methyl acrylate modified nano-CaCO3And on the premise of ensuring that the heat insulation performance of the material is not reduced, the compressive strength and the tensile strength are further improved.

Description

Preparation method of cement-based building exterior wall thermal insulation material
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of a cement-based building exterior wall thermal insulation material.
Background
Heat insulation and preservation of buildings are important aspects of energy conservation, improvement of living environment and use functions. At present, the heat preservation and insulation material is developing towards the integration direction of high efficiency, energy conservation, thin layer, heat insulation, water prevention and external protection, and the specific use of the heat preservation and insulation material is emphasized to improve the heat preservation efficiency and reduce the cost while developing the novel heat preservation and insulation material and conforming to the structure heat preservation and energy conservation technology. The external wall heat insulation material is specially used for building walls and can be divided into the following components according to the internal components: inorganic thermal insulation materials and organic thermal insulation materials. The traditional building heat insulation materials such as EPS boards, XPS boards, PU rigid foams and the like are organic heat insulation materials, and although the organic heat insulation materials have the advantages of excellent heat conductivity coefficient and good heat insulation performance, the organic heat insulation materials have poor fireproof performance and are easy to cause serious fire accidents. Inorganic heat-insulating materials such as rock wool, mineral wool, glass wool, foam concrete, portland cement, vitrified micro bubbles and the like are widely applied to buildings, although the combustion performance reaches A level, the inorganic heat-insulating material has a good fireproof effect, and the heat-insulating layer has higher strength and durability than organic heat-insulating materials and good ecological environmental protection property. However, the inorganic thermal insulation material has poor thermal conductivity and poor thermal insulation performance, so that it is difficult to achieve both strength and thermal insulation and energy saving effects.
The Chinese invention patent CN110526650A discloses a preparation method of a high-strength heat-insulating material, which improves the tensile strength and the compressive strength of the heat-insulating material on the basis of ensuring the heat conductivity coefficient of the heat-insulating material, can meet the construction requirements of various environments, and the prepared cement-based heat-insulating material can be used as materials for building energy conservation, external wall heat insulation and the like. However, the method needs to use a combination of coupling agents with specific proportions and specific types to improve the pretreatment effect of the nano-silica, effectively avoids the agglomeration of the nano-silica, finally improves the compressive strength and the tensile strength of the thermal insulation material, and has requirements on the particle size combination of the nano-silica. More importantly, the strength of the high-strength heat-insulating material obtained by the method is not high.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a preparation method of a cement-based building exterior wall thermal insulation material. The preparation method of the invention adds diatomite to weaken the agglomeration of nano silicon dioxide, and adds the modified polyvinyl ester type epoxy resin and methyl acrylateNano CaCO3Replaces the high molecular prepolymer with complex preparation method and components in the prior art, and further improves the compressive strength and the tensile strength of the heat-insulating material on the premise of ensuring that the heat-insulating property is not reduced.
In order to achieve the aim of the invention, the preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) preparing pretreated nano silicon dioxide: uniformly stirring the nano-silica and the diatomite in a stirrer to obtain pretreated nano-silica;
(2) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and pretreated nano-silica to obtain a modified cement base;
(3) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding the modified cement base, and uniformly stirring to obtain cement-based slurry;
(4) adding aqueous hydrogen peroxide into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall heat-insulating material;
wherein the cement-based building exterior wall thermal insulation material comprises, by weight, 90-100 parts of ordinary portland cement, 10-20 parts of fly ash, 7-15 parts of EVA (ethylene-vinyl acetate copolymer) redispersible latex powder, 10-15 parts of pretreated nano silicon dioxide, 2-4 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO32-4 parts of polycarboxylic acid water reducing agent, 1-2 parts of basalt fiber, 0.5-1 part of basalt fiber, 10-15 parts of aqueous hydrogen peroxide solution and 60-70 parts of water.
Further, the epoxy value of the polyvinyl ester type epoxy resin is 0.45 to 0.55mmol/g, and the acid value is 0.65 to 0.85 mg/g.
On the other hand, the invention also provides a cement-based building exterior wall heat-insulating material, which comprises 90-100 parts by weight of ordinary portland cement, 10-20 parts by weight of fly ash, 7-15 parts by weight of EVA (ethylene vinyl acetate) redispersible latex powder, 10-15 parts by weight of pretreated nano silicon dioxide, 2-4 parts by weight of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO32-4 parts of,1-2 parts of polycarboxylic acid water reducing agent, 0.5-1 part of basalt fiber, 10-15 parts of aqueous hydrogen peroxide solution and 60-70 parts of water.
Further, the average particle size of the nano silicon dioxide is 70-90 nm.
Further, the pretreated nano-silica is obtained by uniformly stirring the nano-silica and diatomite, wherein the mass ratio of the nano-silica to the diatomite is 1: 3-5.
Further, the methyl acrylate modified nano CaCO in the invention3The preparation method comprises the following steps: preparation of CaCO312-15% of water suspension in parts by mass, adjusting the pH value of the uniformly dispersed suspension to 6-7 by using hydrochloric acid, heating, stirring and heating to 70-80 ℃, adding potassium persulfate and methyl acrylate to react under the inert gas environment, cooling, performing vacuum filtration, drying and crushing a filter cake to obtain methyl acrylate modified nano CaCO3。
Compared with the prior art, the invention has the following advantages:
(1) the main component of the diatomite is silicon dioxide, the natural amorphous silicon dioxide formed by stacking diatom biological remains is also one of materials for preparing the nano silicon dioxide, but the diatomite has stronger adsorption performance;
(2) the invention adds EVA re-dispersible latex powder to obtain modified cement base, and adds polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO in the preparation process of cement base slurry3Not only improves the strength of the cement-based heat-insulating material, but also ensures that the heat conductivity coefficient of the heat-insulating material is not higher than 0.06W/(m.K).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is only illustrative of the present invention and is not to be construed as limiting the present invention.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
Unless otherwise specified, the epoxy value of the polyvinyl ester type epoxy resin in the embodiments of the present application is 0.45 to 0.55mmol/g, and the acid value is 0.65 to 0.85 mg/g; the average particle size of the nano silicon dioxide is 70-90 nm; the methyl acrylate modified nano CaCO3The preparation method comprises the following steps: preparation of CaCO312-15% of water suspension in parts by mass, adjusting the pH value of the uniformly dispersed suspension to 6-7 by using hydrochloric acid, heating, stirring and heating to 70-80 ℃, adding potassium persulfate and methyl acrylate to react under the inert gas environment, cooling, performing vacuum filtration, drying and crushing a filter cake to obtain methyl acrylate modified nano CaCO3。
Example 1
The cement-based building exterior wall thermal insulation material comprises, by weight, 95 parts of ordinary portland cement, 15 parts of fly ash, 10 parts of EVA (ethylene vinyl acetate) redispersible latex powder, 13 parts of pretreated nano silicon dioxide, 3 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO33 parts of polycarboxylic acid water reducing agent, 1.5 parts of basalt fiber, 13 parts of aqueous hydrogen peroxide and 65 parts of water.
The preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) preparing pretreated nano silicon dioxide: uniformly stirring nano silicon dioxide and diatomite in a stirrer to obtain pretreated nano silicon dioxide, wherein the mass ratio of the nano silicon dioxide to the diatomite in the pretreated nano silicon dioxide is 1: 4;
(2) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and pretreated nano-silica to obtain a modified cement base;
(3) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding the modified cement base, and uniformly stirring to obtain cement-based slurry;
(4) and adding the aqueous hydrogen peroxide solution into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall thermal insulation material.
Example 2
The cement-based building exterior wall thermal insulation material comprises, by weight, 100 parts of ordinary portland cement, 20 parts of fly ash, 15 parts of EVA (ethylene vinyl acetate) redispersible latex powder, 15 parts of pretreated nano silicon dioxide, 4 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO34 parts of polycarboxylic acid water reducing agent 2 parts, basalt fiber 1 part, aqueous hydrogen peroxide solution 15 parts and water 70 parts.
The preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) preparing pretreated nano silicon dioxide: uniformly stirring nano silicon dioxide and diatomite in a stirrer to obtain pretreated nano silicon dioxide, wherein the mass ratio of the nano silicon dioxide to the diatomite in the pretreated nano silicon dioxide is 1: 3;
(2) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and pretreated nano-silica to obtain a modified cement base;
(3) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding the modified cement base, and uniformly stirring to obtain cement-based slurry;
(4) and adding the aqueous hydrogen peroxide solution into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall thermal insulation material.
Example 3
The cement-based building exterior wall thermal insulation material comprises, by weight, 90 parts of ordinary portland cement, 10 parts of fly ash, 7 parts of EVA (ethylene vinyl acetate) redispersible latex powder, 10 parts of pretreated nano silicon dioxide, 2 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO32 parts of polycarboxylic acid water reducing agent, 1 part of basalt fiber, 0.5 part of basalt fiber, 10 parts of aqueous hydrogen peroxide solution and 60 parts of water.
The preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) preparing pretreated nano silicon dioxide: uniformly stirring nano silicon dioxide and diatomite in a stirrer to obtain pretreated nano silicon dioxide, wherein the mass ratio of the nano silicon dioxide to the diatomite in the pretreated nano silicon dioxide is 1: 5;
(2) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and pretreated nano-silica to obtain a modified cement base;
(3) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding the modified cement base, and uniformly stirring to obtain cement-based slurry;
(4) and adding the aqueous hydrogen peroxide solution into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall thermal insulation material.
Comparative example 1
The cement-based building exterior wall thermal insulation material comprises, by weight, 95 parts of ordinary portland cement, 15 parts of fly ash, 13 parts of pretreated nano-silica, 3 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano-CaCO33 parts of polycarboxylic acid water reducing agent, 1.5 parts of basalt fiber, 13 parts of aqueous hydrogen peroxide and 65 parts of water.
The preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) preparing pretreated nano silicon dioxide: uniformly stirring nano silicon dioxide and diatomite in a stirrer to obtain pretreated nano silicon dioxide, wherein the mass ratio of the nano silicon dioxide to the diatomite in the pretreated nano silicon dioxide is 1: 4;
(2) mixing portland cement, fly ash and pretreated nano-silica to obtain a modified cement base;
(3) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding the modified cement base, and uniformly stirring to obtain cement-based slurry;
(4) and adding the aqueous hydrogen peroxide solution into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall thermal insulation material.
Comparative example 2
The cement-based building exterior wall thermal insulation material comprises, by weight, 95 parts of ordinary portland cement, 15 parts of fly ash, 10 parts of EVA (ethylene vinyl acetate) redispersible latex powder, 13 parts of nano silicon dioxide, 3 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO33 parts of polycarboxylic acid water reducing agent, 1.5 parts of basalt fiber, 13 parts of aqueous hydrogen peroxide and 65 parts of water.
The preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and nano-silica to obtain a modified cement base;
(2) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding the modified cement base, and uniformly stirring to obtain cement-based slurry;
(3) and adding the aqueous hydrogen peroxide solution into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall thermal insulation material.
Comparative example 3
The cement-based building exterior wall thermal insulation material comprises, by weight, 95 parts of ordinary portland cement, 15 parts of fly ash, 10 parts of EVA (ethylene vinyl acetate) redispersible latex powder, 13 parts of pretreated nano-silica, 4 parts of high polymer prepolymer, 1.5 parts of polycarboxylic acid water reducing agent, 0.8 part of basalt fiber, 13 parts of aqueous hydrogen peroxide solution and 65 parts of water.
The preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) preparing pretreated nano silicon dioxide: uniformly stirring nano silicon dioxide and diatomite in a stirrer to obtain pretreated nano silicon dioxide, wherein the mass ratio of the nano silicon dioxide to the diatomite in the pretreated nano silicon dioxide is 1: 4;
(2) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and pretreated nano-silica to obtain a modified cement base;
(3) mixing epoxy resin and acrylic acid, adding tertiary amine, menthane diamine and vinyl trimethoxy silane, mixing, heating to 80 ℃, and uniformly stirring to obtain a high-molecular prepolymer, wherein the mass ratio of the epoxy resin to the acrylic acid to the tertiary amine to the menthane diamine to the vinyl trimethoxy silane is 50: 40: 3: 40: 2;
(4) mixing a polycarboxylic acid water reducing agent, basalt fibers and a high-molecular prepolymer with water, adding a modified cement base, and uniformly stirring to obtain cement-based slurry;
(5) and adding the aqueous hydrogen peroxide solution into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall thermal insulation material.
Comparative example 4
The cement-based building exterior wall thermal insulation material comprises, by weight, 95 parts of ordinary portland cement, 15 parts of fly ash, 10 parts of EVA (ethylene vinyl acetate) redispersible latex powder, 13 parts of pretreated nano-silica, 1.5 parts of a polycarboxylate superplasticizer, 0.8 part of basalt fiber, 13 parts of a hydrogen peroxide aqueous solution and 65 parts of water.
The preparation method of the cement-based building exterior wall thermal insulation material comprises the following steps:
(1) preparing pretreated nano silicon dioxide: uniformly stirring nano silicon dioxide and diatomite in a stirrer to obtain pretreated nano silicon dioxide, wherein the mass ratio of the nano silicon dioxide to the diatomite in the pretreated nano silicon dioxide is 1: 4;
(2) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and pretreated nano-silica to obtain a modified cement base;
(3) mixing a polycarboxylic acid water reducing agent, basalt fibers and water, adding a modified cement base, and uniformly stirring to obtain cement-based slurry;
(4) and adding the aqueous hydrogen peroxide solution into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall thermal insulation material.
The cement-based building exterior wall thermal insulation materials obtained in the above examples 1 to 3 and comparative examples 1 to 4 were tested for compression strength (reference DB21/T2156-2013), tensile strength (reference DB21/T2156-2013), flame retardancy and thermal insulation effect (reference DB21/T2156-2013), and the results are shown in Table 1.
TABLE 1 results of testing the properties of the insulating materials of examples 1-3 and comparative examples 1-4
Test item Flame retardant rating Thermal conductivity W/(m.K) Compressive strength Mpa Tensile strength Mpa
Example 1 A 0.055 0.89 0.38
Example 2 A 0.053 0.88 0.38
Example 3 A 0.055 0.90 0.39
Comparative example 1 A 0.068 0.76 0.29
Comparative example 2 A 0.058 0.81 0.30
Comparative example 3 A 0.073 0.91 0.40
Comparative example 4 A 0.061 0.67 0.25
It will be understood by those skilled in the art that the foregoing is only exemplary of the present invention, and is not intended to limit the invention, which is intended to cover any variations, equivalents, or improvements therein, which fall within the spirit and scope of the invention.

Claims (8)

1. The preparation method of the cement-based building exterior wall thermal insulation material is characterized by comprising the following steps of:
(1) preparing pretreated nano silicon dioxide: uniformly stirring the nano-silica and the diatomite in a stirrer to obtain pretreated nano-silica;
(2) mixing portland cement, fly ash, EVA (ethylene vinyl acetate) redispersible latex powder and pretreated nano-silica to obtain a modified cement base;
(3) modifying polycarboxylate superplasticizer, basalt fiber, polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO3Mixing with water, adding the modified cement base, and uniformly stirring to obtain cement-based slurry;
(4) adding aqueous hydrogen peroxide into the cement-based slurry, stirring to obtain cement-based foaming slurry, and curing and forming to obtain the cement-based building exterior wall heat-insulating material;
wherein the cement-based building exterior wall thermal insulation material comprises, by weight, 90-100 parts of ordinary portland cement, 10-20 parts of fly ash, 7-15 parts of EVA (ethylene-vinyl acetate copolymer) redispersible latex powder, 10-15 parts of pretreated nano silicon dioxide, 2-4 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO32-4 parts of polycarboxylic acid water reducing agent, 1-2 parts of basalt fiber, 0.5-1 part of basalt fiber, 10-15 parts of aqueous hydrogen peroxide solution and 60-70 parts of water.
2. The method for preparing the cement-based building exterior wall thermal insulation material as claimed in claim 1, wherein the epoxy value of the polyvinyl ester type epoxy resin is 0.45-0.55mmol/g, and the acid value is 0.65-0.85 mg/g.
3. The method for preparing the cement-based building exterior wall thermal insulation material as claimed in claim 1, wherein the average particle size of the nano silica is 70-90 nm.
4. The preparation method of the cement-based building exterior wall thermal insulation material according to claim 1, wherein the mass ratio of the nano-silica to the diatomite in the pretreated nano-silica is 1: 3-5.
5. The preparation method of the cement-based building exterior wall thermal insulation material is characterized in that the material comprises, by weight, 90-100 parts of ordinary portland cement, 10-20 parts of fly ash, 7-15 parts of EVA (ethylene vinyl acetate) redispersible latex powder, 10-15 parts of pretreated nano silicon dioxide, 2-4 parts of polyethylene ester type epoxy resin and methyl acrylate modified nano CaCO32-4 parts of polycarboxylic acid water reducing agent, 1-2 parts of basalt fiber, 0.5-1 part of basalt fiber, 10-15 parts of aqueous hydrogen peroxide solution and 60-70 parts of water.
6. The cement-based building exterior wall thermal insulation material as claimed in claim 5, wherein the nano silica has an average particle size of 70-90 nm.
7. The cement-based building exterior wall thermal insulation material as claimed in claim 5, wherein the pretreated nano-silica is obtained by uniformly stirring nano-silica and diatomite, wherein the mass ratio of the nano-silica to the diatomite is 1: 3-5.
8. The cement-based building exterior wall thermal insulation material as claimed in claim 5, wherein the nano CaCO modified by methyl acrylate3The preparation method comprises the following steps: preparation of CaCO312 to 15 mass percent of water suspension, and the water suspension is uniformly dispersedRegulating the pH value of the suspension to 6-7 by using hydrochloric acid, heating, stirring and heating to 70-80 ℃, adding potassium persulfate and methyl acrylate to react in an inert gas environment, cooling, performing vacuum filtration, drying and crushing a filter cake to obtain methyl acrylate modified nano CaCO3。
CN202011088773.1A 2020-10-13 2020-10-13 Preparation method of cement-based building exterior wall thermal insulation material Withdrawn CN112159246A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114507063A (en) * 2022-03-31 2022-05-17 萍乡华创电气有限公司 Porcelain insulator slip casting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114507063A (en) * 2022-03-31 2022-05-17 萍乡华创电气有限公司 Porcelain insulator slip casting method
CN114507063B (en) * 2022-03-31 2023-01-03 萍乡华创电气有限公司 Porcelain insulator slip casting method

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Application publication date: 20210101