CN112321235A - Aerated thermal-insulation mortar and preparation method thereof - Google Patents
Aerated thermal-insulation mortar and preparation method thereof Download PDFInfo
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- CN112321235A CN112321235A CN202011279382.8A CN202011279382A CN112321235A CN 112321235 A CN112321235 A CN 112321235A CN 202011279382 A CN202011279382 A CN 202011279382A CN 112321235 A CN112321235 A CN 112321235A
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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
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/34—Natural resins, e.g. rosin
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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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
- 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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- 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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses aerated thermal insulation mortar, which comprises the following raw materials: river sand, ordinary portland cement, polyurethane, an air entraining agent, a foam stabilizer, a water reducing agent, an early strength agent and water; the preparation method comprises the following steps: (1) weighing the raw materials; (2) mixing and stirring river sand and ordinary portland cement to obtain a material A; (3) adding a foam stabilizer and an early strength agent, and uniformly stirring to obtain a material B for later use; (4) adding polyurethane into water, and uniformly stirring; (5) adding an air entraining agent, and uniformly stirring to obtain a solution A; (6) adding a water reducing agent, and uniformly stirring to obtain a solution B; (7) and adding the solution B into the material B twice, and stirring to obtain the material B. According to the invention, the air entraining agent and the polyurethane are added, so that the dispersibility of the polyurethane in the mortar can be greatly improved, the anti-permeability and anti-freezing properties of the mortar are greatly improved, and the heat-insulation mortar which is good in heat insulation, anti-permeability and anti-freezing properties, non-flammable, non-hygroscopic and simple in construction process is prepared.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to air-entrapping heat-insulating mortar and a preparation method thereof.
Background
Building energy conservation is an important subject in the building industry of China, more than 97% of the existing built houses belong to high-energy-consumption buildings, the air tightness is low, the heat insulation performance is poor, the energy consumption in winter and summer temperature regulation of the buildings is directly caused to be excessive, and meanwhile, the emission of waste particulate matters such as carbon dioxide and the like is high, so that the haze is caused. The main problem of the existing building masonry and plastering mortar is that the mortar cannot ensure the heat preservation and heat insulation performance of the mortar when applied to a building wall with heat preservation requirements, and particularly cannot meet the anti-freezing requirement of plastering of the external wall of the building in northern China.
Polyurethane (PU), a full name of polyurethane, is a high molecular compound, which is classified into two major classes, polyester type and polyether type, and can be made into polyurethane plastics (mainly foamed plastics), polyurethane fibers (china called spandex), polyurethane rubber and elastomers. The polyurethane mainly has a thermoplastic linear structure, has better stability, chemical resistance, rebound resilience and mechanical property than a PVC foaming material, and has smaller compression deformability; the polyurethane elastomer has the performance between that of plastic and rubber, is oil-resistant, wear-resistant, low-temperature-resistant, ageing-resistant, high in hardness and elastic; good heat insulation, sound insulation, shock resistance and gas defense performance. More importantly, polyurethane has low thermal conductivity, good cohesiveness, waterproofness and durability, and is called as a novel thermal insulation material.
However, the direct incorporation of polyurethane into mortar causes problems of poor uniformity, too rapid setting and hardening of mortar, and the like, thereby affecting the application of polyurethane in mortar.
Therefore, how to provide a thermal insulation mortar by using polyurethane is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide an aerated thermal insulation mortar and a preparation method thereof, so as to solve the defects in the prior art. The invention prepares the thermal insulation mortar with good thermal insulation, impermeability and frost resistance, nonflammability, difficult water absorption and simple construction process by adding the air entraining agent and the polyurethane.
In order to achieve the purpose, the invention adopts the following technical scheme:
the aerated thermal insulation mortar comprises the following raw materials in parts by weight: 1300-1700 parts of river sand, 250-400 parts of ordinary portland cement, 10-30 parts of polyurethane, 2.5-4 parts of air entraining agent, 1.7-2.6 parts of foam stabilizer, 4.5-6 parts of water reducing agent, 7.5-15 parts of early strength agent and 200-450 parts of water.
The invention has the beneficial effects that the polyurethane has low heat conductivity coefficient, good bonding performance and good waterproof performance, the polyurethane is poured on site and has good long-term resistance, the air entraining agent is added into the mortar, the dispersibility of the polyurethane in the mortar can be greatly improved, the anti-permeability and anti-freezing performance of the mortar is greatly improved, and the excellent mixed mortar which is green, environment-friendly, heat-preserving and insulating, anti-permeability and anti-freezing is formed, thereby promoting the development of green building materials and making contribution to energy conservation and emission reduction.
Further, the grain size of the river sand is 0.15-2.5 mm.
The river sand has the beneficial effects that the river sand is produced by long-time repeated collision and friction of natural stones under the action of water in a natural state, and the surface of the river sand has certain smoothness. The river sand is added into the mortar to serve as an aggregate, so that the mortar plays a role of a bearing framework, and the cement mortar is wrapped outside the river sand to form a cement stone structure, which is a main source of the strength of the mortar. Meanwhile, river sand needs to be screened, and the river sand with the particle size of 0.15-2.5mm is selected, so that the continuous and good particle size distribution of the river sand can be ensured, the river sand is reasonably matched with particles with different sizes, gaps among the sand particles are reduced, and the strength is improved.
Further, the strength of the ordinary portland cement is PO 42.5 or PO 52.5.
The technical scheme has the beneficial effects that the common Portland cement is a hydraulic cementing material prepared by grinding Portland cement clinker, 5-20% of mixed material and a proper amount of gypsum, and has the characteristics of high strength, large hydration heat, good frost resistance, small dry shrinkage, good wear resistance, good carbonization resistance, poor corrosion resistance and no high temperature resistance. The invention adds ordinary Portland cement into the mortar as a hydraulic cementing material, combines with water in the cement mortar, wraps river sand, and provides strength together with materials such as the river sand and the like. Meanwhile, the strength grade of ordinary portland cement directly affects the strength of the final mortar.
Further, the polyurethane is at least one of cationic aqueous polyurethane, anionic aqueous polyurethane and nonionic aqueous polyurethane. Preferably, the cationic aqueous polyurethane is FS-0566M type or PU-700A type; the anionic water-based polyurethane is AH-1502 type, F0402 type or F0403 type; the nonionic aqueous polyurethane is AH-1704-1 or PU 7301.
The further technical scheme has the beneficial effects that the polyurethane is dispersed in the mortar, so that the heat insulation performance, the waterproof performance, the anti-permeability performance and the anti-freezing performance of the mortar can be improved. The selected cationic waterborne polyurethane, anionic waterborne polyurethane and nonionic waterborne polyurethane are waterborne materials, have good dispersibility in mortar, do not need to additionally add a dispersing agent or an emulsifying agent, are environment-friendly and nontoxic, have good adhesion to a substrate, and have good waterproof performance, low temperature resistance and heat insulation performance.
Further, the air-entraining agent is a rosin resin air-entraining agent and/or an alkylbenzene sulfonate air-entraining agent. The alkylbenzene sulfonate air entraining agent is preferably sodium alkylbenzene sulfonate. Preferably, the rosin resin type air entraining agent is DH-4013 type or DH-4013-1 type; the alkylbenzene sulfonate air entraining agent is sodium dodecyl sulfate K12 type or sodium dodecyl benzene sulfonate type.
The mortar is added with the air entraining agent, and a large amount of uniformly distributed, closed and stable micro bubbles can be generated in the mixture in the stirring process, so that the workability, the water retention property and the cohesiveness of the mortar are improved. Compared with other types of air-entraining agents, the rosin resin air-entraining agent and the alkylbenzene sulfonate air-entraining agent have higher water reducing rate and smaller adverse effect on the compressive strength of the mortar under the condition of equal air content.
Further, the foam stabilizer is a Silicone polyether emulsion (Modified fluorinated Silicone, MPS for short).
The mortar with the foam stabilizer has the beneficial effects that the foam stabilizer is added into the mortar, so that the stability of a bubble liquid film in a mortar mixture can be enhanced, surfactant molecules are orderly distributed in the bubble liquid film, and the foam has good elasticity and self-repairing capability. Compared with other foam stabilizers, the silicone polyether emulsion is more convenient to use and has a more obvious foam stabilizing effect.
Further, the water reducing agent is at least one of a lignosulfonate water reducing agent, a naphthalene high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent. Preferably, the lignosulfonate water reducing agent is sodium lignosulfonate MN-1 type, MN-3 type or MR type; the naphthalene high-efficiency water reducing agent is NNO type, SP-1 type or UNF-2 type; the polycarboxylate high-efficiency water reducing agent is ZY8020 type or HPWR-S type.
The mortar mixture has the beneficial effects that the water reducing agent is added into the mortar, so that cement particles are dispersed, the working performance can be improved, the unit water consumption is reduced, and the fluidity of the mortar mixture is improved. The water reducing agent selected by the invention has the advantages of low price, low mixing amount, high water reducing rate, obvious reinforcing effect and environmental protection.
Further, the early strength agent is at least one of calcium chloride, sodium sulfate and triethanolamine.
The mortar has the beneficial effects that the early strength agent is added into the mortar, so that the mortar has the effects of reducing water, improving the hydration speed of cement, enhancing the early strength and the like. The early strength agent selected by the invention has stable performance, strong adaptability, low cost and high early strength effect.
A preparation method of air-entrapping heat-insulating mortar specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the aerated thermal insulation mortar;
(2) mixing river sand and ordinary portland cement, and stirring at the speed of 30-60r/min for 2-3min to obtain a material A;
(3) adding a foam stabilizer and an early strength agent into the material A, and stirring at the speed of 40-60r/min for 1-2min to obtain a material B for later use;
(4) adding polyurethane into water, and stirring at the speed of 40-50r/min for 1-2min to obtain a polyurethane aqueous solution;
(5) adding an air entraining agent into the polyurethane aqueous solution, and stirring at the speed of 30-45r/min for 1-2min to obtain a solution A;
(6) adding a water reducing agent into the solution A, and stirring at the speed of 30-45r/min for 1-2min to obtain a solution B;
(7) dividing the solution B into two parts, firstly adding the first part of the solution B into the material B, and stirring at the speed of 30-45r/min for 1-2 min; and then adding the residual solution B, and continuously stirring for 1-2min at the speed of 30-45r/min to obtain the aerated thermal insulation mortar.
Further, in the step (7), the mass ratio of the first part of solution B to the solution B is 40-60%.
The beneficial effects of adopting above-mentioned further technical scheme lie in, divide into twice with solution B and add, material B and solution B mix more fully, and the gassing agent produces the bubble more evenly stable, and the effect performance of foam stabilizer is better simultaneously, is favorable to the formation of mortar later stage intensity and the maintenance of thermal insulation performance.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the air-entrapping heat-insulating mortar added with the air entraining agent has the advantages of improved internal porosity, reduced overall density, reduced heat conductivity coefficient, increased thermal resistance, easy bonding with other building base materials, nonflammability, difficult water absorption, simple construction process and light weight, and can be properly applied to various buildings, thereby greatly improving the heat-insulating property, permeability resistance and frost resistance of the buildings;
2. the air-entrapping heat-insulating mortar has the advantages of environmental protection, no pollution, safety and reliability, conforms to the strategic target of developing green building materials, and responds to the national call for energy conservation and emission reduction.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, the river sands are all mixtures with a particle size of 0.15-2.5 mm.
Example 1
The aerated thermal insulation mortar comprises the following raw materials by weight: 1300kg of river sand, 250kg of PO 42.5 common portland cement, 10kg of FS-0566M type cationic waterborne polyurethane, 2.5kg of DH-4013 type rosin resin air entraining agent, 1.7kg of silicone polyether emulsion, 4.5kg of sodium lignosulfonate MN-1 type water reducing agent, 7.5kg of calcium chloride and 200kg of water;
the preparation method of the aerated thermal insulation mortar specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the aerated thermal insulation mortar;
(2) mixing river sand and PO 42.5 ordinary portland cement, and stirring at the normal temperature at the speed of 30r/min for 2min to obtain a material A;
(3) adding the silicone polyether emulsion and calcium chloride into the material A, and stirring at the speed of 40r/min for 1min to obtain a material B for later use;
(4) adding FS-0566M type cationic waterborne polyurethane into water, and stirring at the speed of 40r/min for 1min to obtain a polyurethane aqueous solution;
(5) adding a DH-4013 type rosin resin air entraining agent into a polyurethane aqueous solution, and stirring at the speed of 30r/min for 1min to obtain a solution A;
(6) adding sodium lignosulfonate MN-1 type water reducing agent into the solution A, and stirring at the speed of 30r/min for 1min to obtain a solution B;
(7) adding the solution B into the material B according to the mass ratio of 40% for the first time, and stirring at the speed of 30r/min for 1 min; and then adding the residual solution B, and continuously stirring for 1min at the speed of 30r/min to obtain the air-entrapping heat-insulating mortar.
(8) And (5) maintenance: pouring the air-entrapping heat-insulating mortar into a corresponding mould, curing in wet air with the temperature of 18 ℃ and the relative humidity of more than 90 percent for 24h, demoulding, curing for 21d under the curing condition, and curing in air with the temperature of 18 ℃ and the relative humidity of 55 percent for 6d to obtain the air-entrapping heat-insulating mortar test piece.
Example 2
The aerated thermal insulation mortar comprises the following raw materials by weight: 1550kg of river sand, 315.8kg of PO 42.5 common portland cement, 10.9kg of PU-700A cationic waterborne polyurethane, 3.3kg of DH-4013 rosin resin air entraining agent, 1.8kg of silicone resin polyether emulsion, 4.5kg of sodium lignosulfonate MN-3 water reducing agent, 7.5kg of calcium chloride and 330kg of water;
the preparation method of the aerated thermal insulation mortar specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the aerated thermal insulation mortar;
(2) mixing river sand and PO 42.5 ordinary portland cement, and stirring at the normal temperature at the speed of 35r/min for 2min to obtain a material A;
(3) adding the silicone polyether emulsion and calcium chloride into the material A, and stirring at the speed of 45r/min for 1min to obtain a material B for later use;
(4) adding PU-700A type cationic waterborne polyurethane into water, and stirring at the speed of 42r/min for 1min to obtain a polyurethane aqueous solution;
(5) adding a DH-4013 type rosin resin air entraining agent into a polyurethane aqueous solution, and stirring at the speed of 35r/min for 1min to obtain a solution A;
(6) adding sodium lignosulfonate MN-3 type water reducing agent into the solution A, and stirring at the speed of 35r/min for 1min to obtain a solution B;
(7) adding the solution B into the material B according to the mass ratio of 45% for the first time, and stirring at the speed of 35r/min for 1 min; and then adding the residual solution B, and continuously stirring for 1min at the speed of 35r/min to obtain the air-entrapping heat-insulating mortar.
(8) And (5) maintenance: pouring the air-entrapping heat-insulating mortar into a corresponding mould, curing in wet air with the temperature of 19 ℃ and the relative humidity of more than 90 percent for 24h, demoulding, curing for 21d under the curing condition, and curing in air with the temperature of 19 ℃ and the relative humidity of 58 percent for 6d to obtain the air-entrapping heat-insulating mortar test piece.
Example 3
The aerated thermal insulation mortar comprises the following raw materials by weight: 1550kg of river sand, 313.5kg of PO 42.5 ordinary portland cement, 13.2kg of AH-1502 type anionic waterborne polyurethane, 3.3kg of DH-4013-1 type rosin resin air entraining agent, 1.8kg of silicone polyether emulsion, 4.5kg of NNO type naphthalene high-efficiency water reducing agent, 7.5kg of sodium sulfate and 330kg of water;
the preparation method of the aerated thermal insulation mortar specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the aerated thermal insulation mortar;
(2) mixing river sand and PO 42.5 ordinary portland cement, and stirring at the normal temperature at the speed of 40r/min for 2min to obtain a material A;
(3) adding the silicone polyether emulsion and sodium sulfate into the material A, and stirring at the speed of 50r/min for 1min to obtain a material B for later use;
(4) adding AH-1502 type anionic waterborne polyurethane into water, and stirring at the speed of 45r/min for 1min to obtain a polyurethane aqueous solution;
(5) adding DH-4013-1 type rosin resin air entraining agent into polyurethane aqueous solution, and stirring at the speed of 35r/min for 1min to obtain solution A;
(6) adding an NNO type naphthalene high-efficiency water reducing agent into the solution A, and stirring at the speed of 35r/min for 1min to obtain a solution B;
(7) adding the solution B into the material B according to the mass ratio of 50% for the first time, and stirring for 1min at the speed of 35 r/min; and then adding the residual solution B, and continuously stirring for 1min at the speed of 35r/min to obtain the air-entrapping heat-insulating mortar.
(8) And (5) maintenance: pouring the air-entrapping heat-insulating mortar into a corresponding mould, curing in wet air with the temperature of 20 ℃ and the relative humidity of more than 90 percent for 24h, demoulding, curing for 21d under the curing condition, and curing in air with the temperature of 20 ℃ and the relative humidity of 60 percent for 6d to obtain the air-entrapping heat-insulating mortar test piece.
Example 4
The aerated thermal insulation mortar comprises the following raw materials by weight: 1550kg of river sand, 310.2kg of PO 52.5 ordinary portland cement, 16.5kg of F0402 type anionic waterborne polyurethane, 3.3kg of sodium dodecyl sulfate K12 type air entraining agent, 1.8kg of silicone resin polyether emulsion, 4.5kg of SP-1 type naphthalene high-efficiency water reducing agent, 7.5kg of sodium sulfate and 330kg of water;
the preparation method of the aerated thermal insulation mortar specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the aerated thermal insulation mortar;
(2) mixing river sand and PO 52.5 ordinary portland cement, and stirring at the normal temperature at the speed of 50r/min for 3min to obtain a material A;
(3) adding the silicone polyether emulsion and sodium sulfate into the material A, and stirring at the speed of 50r/min for 2min to obtain a material B for later use;
(4) adding F0402 type anionic waterborne polyurethane into water, and stirring at the speed of 45r/min for 2min to obtain a polyurethane aqueous solution;
(5) adding a sodium dodecyl sulfate K12 type air entraining agent into the polyurethane aqueous solution, and stirring at the speed of 40r/min for 2min to obtain a solution A;
(6) adding the SP-1 type naphthalene series high-efficiency water reducing agent into the solution A, and stirring at the speed of 40/min for 2min to obtain a solution B;
(7) adding the solution B into the material B according to the mass ratio of 50% for the first time, and stirring at the speed of 40r/min for 2 min; and then adding the residual solution B, and continuously stirring for 2min at the speed of 40r/min to obtain the aerated heat-insulating mortar.
(8) And (5) maintenance: pouring the air-entrapping heat-insulating mortar into a corresponding mould, curing in wet air with the temperature of 20 ℃ and the relative humidity of more than 90 percent for 24h, demoulding, curing for 21d under the curing condition, and curing in air with the temperature of 20 ℃ and the relative humidity of 60 percent for 6d to obtain the air-entrapping heat-insulating mortar test piece.
Example 5
The aerated thermal insulation mortar comprises the following raw materials by weight: 1550kg of river sand, 306.9kg of PO 52.5 common portland cement, 19.8kg of AH-1704-1 type nonionic waterborne polyurethane, 3.3kg of sodium dodecyl sulfate K12 type air entraining agent, 1.8kg of silicone resin polyether emulsion, 4.5kg of ZY8020 type polycarboxylate superplasticizer, 7.5kg of triethanolamine and 330kg of water;
the preparation method of the aerated thermal insulation mortar specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the aerated thermal insulation mortar;
(2) mixing river sand and PO 52.5 ordinary portland cement, and stirring at the normal temperature at the speed of 60r/min for 2min to obtain a material A;
(3) adding the silicone polyether emulsion and triethanolamine into the material A, and stirring at the speed of 60r/min for 1min to obtain a material B for later use;
(4) adding AH-1704-1 type nonionic waterborne polyurethane into water, and stirring at the speed of 50r/min for 1min to obtain a polyurethane aqueous solution;
(5) adding a sodium dodecyl sulfate K12 type air entraining agent into the polyurethane aqueous solution, and stirring at the speed of 45r/min for 1min to obtain a solution A;
(6) adding ZY8020 type polycarboxylate superplasticizer into the solution A, and stirring at the speed of 45r/min for 1min to obtain solution B;
(7) adding the solution B into the material B according to the mass ratio of 55% for the first time, and stirring at the speed of 45r/min for 1 min; and then adding the residual solution B, and continuously stirring for 1min at the speed of 45r/min to obtain the aerated heat-insulating mortar.
(8) And (5) maintenance: pouring the air-entrapping heat-insulating mortar into a corresponding mould, curing in wet air with the temperature of 21 ℃ and the relative humidity of more than 90 percent for 24h, demoulding, curing for 21d under the curing condition, and curing in air with the temperature of 21 ℃ and the relative humidity of 62 percent for 6d to obtain the air-entrapping heat-insulating mortar test piece.
Example 6
The aerated thermal insulation mortar comprises the following raw materials by weight: 1700kg of river sand, 400kg of PO 52.5 ordinary portland cement, 30kg of PU7301 type nonionic waterborne polyurethane, 4kg of sodium dodecyl benzene sulfonate type air entraining agent, 2.6kg of silicone polyether emulsion, 6kg of HPWR-S type polycarboxylate superplasticizer, 15kg of triethanolamine and 450kg of water;
the preparation method of the aerated thermal insulation mortar specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the aerated thermal insulation mortar;
(2) mixing river sand and PO 52.5 ordinary portland cement, and stirring at the normal temperature at the speed of 60r/min for 3min to obtain a material A;
(3) adding the silicone polyether emulsion and triethanolamine into the material A, and stirring at the speed of 60r/min for 2min to obtain a material B for later use;
(4) adding PU7301 type nonionic waterborne polyurethane into water, and stirring at a speed of 50r/min for 2min to obtain a polyurethane aqueous solution;
(5) adding a sodium dodecyl benzene sulfonate type air entraining agent into a polyurethane aqueous solution, and stirring at the speed of 45r/min for 2min to obtain a solution A;
(6) adding an HPWR-S type polycarboxylate superplasticizer into the solution A, and stirring at the speed of 45r/min for 2min to obtain a solution B;
(7) adding the solution B into the material B according to the mass ratio of 60% for the first time, and stirring at the speed of 45r/min for 2 min; and then adding the residual solution B, and continuously stirring for 2min at the speed of 45r/min to obtain the aerated heat-insulating mortar.
(8) And (5) maintenance: pouring the air-entrapping heat-insulating mortar into a corresponding mould, curing in wet air with the temperature of 22 ℃ and the relative humidity of more than 90 percent for 24h, demoulding, curing for 21d under the curing condition, and curing in air with the temperature of 22 ℃ and the relative humidity of 65 percent for 6d to obtain the air-entrapping heat-insulating mortar test piece.
Comparative example
The common mortar comprises the following raw materials by weight: 1550kg of river sand, 330kg of PO 42.5 ordinary portland cement and 330kg of water;
the preparation method of the common mortar specifically comprises the following steps:
(1) weighing the raw materials according to the parts by weight of the common mortar;
(2) mixing river sand and PO 42.5 ordinary portland cement, and stirring at the speed of 60r/min for 3min to obtain a dry material mixture;
(3) adding water into the dry material mixture according to the mass ratio of 60% for the first time, and stirring for 3min at the speed of 45 r/min; adding the residual water into the mixture for the second time, and stirring at the speed of 45r/min for 4min to obtain common mortar;
(4) and (5) maintenance: pouring the common mortar into a corresponding mould, curing in wet air with the temperature of 22 ℃ and the relative humidity of more than 90 percent for 24h, then demoulding, curing for 21d under the curing condition, and curing in air with the temperature of 22 ℃ and the relative humidity of 65 percent for 6d to obtain the aerated thermal insulation mortar test piece.
Performance testing
The air-entrapping heat-insulating mortar prepared in examples 1 to 6 and the ordinary mortar prepared in the comparative example were each subjected to measurement of thermal conductivity, compressive strength, flexural strength, porosity and tensile bonding strength according to the detection index and method of the national standard GB/T26000-2010 (vitrified microbead thermal-insulating mortar for expansion).
The measurement results are shown in table 1.
Table 1 results of performance measurement of air-entrained thermal insulation mortar of examples 1 to 6 and comparative example general mortar
As can be seen from Table 1, the thermal conductivity of the mortar is higher than that of the conventional mortar in the comparative example, and the thermal conductivity of the mortar is reduced after the polyurethane and the air entraining agent are mixed in the examples 1 to 6.
In examples 1 to 6, as the addition amounts of the polyurethane and the air entraining agent are gradually increased, the thermal conductivity of the mortar is gradually reduced, and the thermal insulation performance is gradually enhanced; the compressive strength of the mortar has a tendency of reducing, but is not obvious, and all the requirements of the compressive strength are met; the flexural strength of the mortar is gradually reduced, but the requirements of the flexural strength are met; the tensile bonding strength of the mortar is gradually reduced, but the tensile bonding strength is met; the porosity of the interior of the mortar test piece is gradually increased, the increase trend is obvious, and the gradual reduction of the heat conductivity coefficient is reflected to a certain extent, so that the heat insulation performance is gradually enhanced.
The tests prove that the aerated thermal-insulation mortar prepared by the invention has good comprehensive performance, the tensile bonding strength of the mortar is improved to a certain extent, when the polyurethane mixing amount is increased, the thermal conductivity coefficient of the mortar is greatly reduced, and the thermal-insulation performance of the mortar is greatly improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The aerated thermal-insulation mortar is characterized by comprising the following raw materials in parts by weight: 1300-1700 parts of river sand, 250-400 parts of ordinary portland cement, 10-30 parts of polyurethane, 2.5-4 parts of air entraining agent, 1.7-2.6 parts of foam stabilizer, 4.5-6 parts of water reducing agent, 7.5-15 parts of early strength agent and 200-450 parts of water.
2. The air-entrapping heat-insulating mortar as claimed in claim 1, wherein the river sand has a particle size of 0.15 to 2.5 mm.
3. The air-entrained thermal insulation mortar of claim 1, wherein the strength of the ordinary portland cement is PO 42.5 or PO 52.5.
4. The air-entrapping heat-insulating mortar according to claim 1, wherein the polyurethane is at least one of cationic waterborne polyurethane, anionic waterborne polyurethane and nonionic waterborne polyurethane.
5. The air-entrapping heat-insulating mortar according to claim 1, wherein the air-entraining agent is a rosin resin air-entraining agent and/or an alkylbenzene sulfonate air-entraining agent.
6. The air-entrapping heat-insulating mortar as claimed in claim 1, wherein the foam stabilizer is a silicone polyether emulsion.
7. The air-entrapping heat-insulating mortar of claim 1, wherein the water reducing agent is at least one of lignosulfonate water reducing agents, naphthalene high-efficiency water reducing agents and polycarboxylate high-efficiency water reducing agents.
8. The aerated thermal insulation mortar of claim 1, wherein the early strength agent is at least one of calcium chloride, sodium sulfate and triethanolamine.
9. The preparation method of the air-entrapping heat-insulating mortar is characterized by comprising the following steps:
(1) weighing the raw materials according to the parts by weight of the air-entrapping heat-insulating mortar of any one of claims 1 to 8;
(2) mixing river sand and ordinary portland cement, and stirring at the speed of 30-60r/min for 2-3min to obtain a material A;
(3) adding a foam stabilizer and an early strength agent into the material A, and stirring at the speed of 40-60r/min for 1-2min to obtain a material B for later use;
(4) adding polyurethane into water, and stirring at the speed of 40-50r/min for 1-2min to obtain a polyurethane aqueous solution;
(5) adding an air entraining agent into the polyurethane aqueous solution, and stirring at the speed of 30-45r/min for 1-2min to obtain a solution A;
(6) adding a water reducing agent into the solution A, and stirring at the speed of 30-45r/min for 1-2min to obtain a solution B;
(7) dividing the solution B into two parts, firstly adding the first part of the solution B into the material B, and stirring at the speed of 30-45r/min for 1-2 min; and then adding the residual solution B, and continuously stirring for 1-2min at the speed of 30-45r/min to obtain the aerated thermal insulation mortar.
10. The preparation method of air-entrained thermal insulation mortar according to claim 9, wherein in the step (7), the mass ratio of the first part of solution B to the solution B is 40-60%.
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