Phase change energy-saving synergist for autoclaved aerated concrete and application thereof

Abstract

The present application belongs to the technical field of autoclaved aerated concrete, and particularly relates to an autoclaved aerated concrete phase change energy-saving synergist and application thereof. The synergist and a foaming agent aluminum powder or aluminum paste in raw materials of the autoclaved aerated concrete perform double hydrolysis reaction, directly generated gas phase is carbon dioxide phase, and generated solid phase is mainly calcium carbonate phase and silicon dioxide phase, and the proportion in total solid phase is > 50%; dry density: < 650 kg / m 3 , and the proportion of holes with a pore size of < 1 mm is > 50%. The autoclaved aerated concrete phase change energy-saving synergist provided by the present application is used in autoclaved aerated concrete products, improves the heat preservation and insulation performance of the products, and further improves the compression resistance, frost resistance, carbonization resistance, size stability, fire resistance and fire extinguishing performance of the products; improves the construction efficiency of the products, saves energy and reduces consumption, and is friendly to the environment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of autoclaved aerated concrete, and particularly relates to an autoclaved aerated concrete phase change energy-saving synergist and application thereof. BACKGROUND

[0002] At present, autoclaved aerated concrete blocks and wallboard products cannot meet the building energy-saving standards due to the large thermal conductivity coefficient of single material, and need to be compounded with organic thermal insulation materials to meet the energy-saving requirements. With the improvement of building energy-saving requirements, the composite organic thermal insulation materials of wall bodies are getting thicker and thicker, causing the complexity of building construction technology, the continuous rise of building cost, and the increase of carbon footprint. In addition, the large use of flammable organic thermal insulation materials also brings safety hazards to building fire prevention. The process technology of autoclaved aerated concrete products is relatively mature, and the performance of the products is good, so the products have been widely used. However, with the improvement of energy-saving standards, the application prospect of the products in external walls has been greatly challenged.

[0003] Autoclaved aerated concrete material is a lightweight concrete material formed by adding foaming agent material to solid phase material and autoclaving curing, wherein the solid phase material mainly includes hydrated calcium silicate, tobermorite and other materials, and the gas phase material is mainly hydrogen. The heat transfer in the autoclaved aerated concrete product is mainly the heat transfer of solid phase and the convection and heat radiation of gas phase. The foaming agent of traditional autoclaved aerated concrete product is aluminum powder or aluminum paste, and the gas produced by aluminum powder or aluminum paste in an alkaline environment is hydrogen. The thermal conductivity coefficient of hydrogen at 0℃ is 0.176 W / m 2 ·K, which makes the thermal conductivity coefficient of traditional autoclaved aerated concrete product larger than that of concrete product filled with air, nitrogen, oxygen and carbon dioxide. The continuous heat conduction and heat radiation of solid phase of autoclaved aerated concrete product are also strong, which also causes poor thermal insulation performance of the product.

[0004] At the same time, the mixing, pouring and pre-curing stages of the production process of autoclaved aerated concrete product need a temperature of 45-65℃, which inevitably exists certain energy consumption, increases the cost of the product, consumes energy and increases carbon dioxide emission, which is not conducive to environmental protection.

[0005] CN116283352A discloses a method for preparing aerated concrete by carbon dioxide gas production and a concrete product, water and a modifier (gypsum, a surfactant, nanoparticles and bicarbonate) are added to the aerated concrete raw material and stirred to form a slurry; the slurry is introduced into carbon dioxide as a gas production gas, the carbon dioxide is mixed with the slurry, and the pre-curing aerated concrete blank is obtained; the aerated concrete blank is subjected to autoclave curing to obtain autoclaved aerated concrete. The introduction of carbon dioxide as a gas production gas, the low thermal conductivity of carbon dioxide, the negative pressure or vacuum degree and the thermal stability of carbonation products improve the heat preservation and insulation, high temperature resistance and other properties of the concrete product, but the use of carbon dioxide gas filling into the concrete to prepare aerated concrete, the foam will be broken and foamed during the stirring process, the foam will be affected by the gravity of the slurry during the initial setting and final setting stage, and the pore structure uniformity of the prepared aerated concrete product is poor, there are many large pores, and the gas will form thermal convection inside. Because the pore structure is an important property of aerated concrete, it will directly affect the thermal conductivity of aerated concrete, which is an important reason for the large thermal conductivity coefficient of the product. According to the standard requirements of building energy saving design with a heat preservation coefficient of 1.1, the product single material wall body with a thickness of 340mm can meet the standard requirements of building energy saving of 83%, which reduces the use area and does not meet the usual design requirements of public and civil building outer wall body of 300mm. Moreover, the supercritical carbon dioxide is used to prepare the aerated concrete tank, and the pressure is greater than 7MPa, which has a safety hazard.

[0006] Therefore, without affecting other properties of the autoclaved aerated concrete product, the heat preservation and insulation performance of the autoclaved aerated concrete product is improved, the single material can meet the standard requirements of building energy saving, the building fireproof performance is improved, the building cost is reduced, and the construction efficiency is improved, which has great significance for the field of autoclaved aerated concrete. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the above-mentioned defects existing in the prior art, provide an autoclaved aerated concrete phase change energy-saving synergist, which is used in autoclaved aerated concrete products to improve the heat preservation and insulation performance of the products, and can further improve the compression resistance, frost resistance, carbonization resistance, size stability, flame retardation and fire extinguishing performance of the products; improve the construction efficiency of the products, save energy and reduce consumption, and be friendly to the environment.

[0008] The synergist described in the present application and the foaming agent aluminum powder or aluminum paste in the autoclaved aerated concrete raw material undergo double hydrolysis reaction, directly producing gas phase of carbon dioxide phase, and solid phase mainly of calcium carbonate phase and silicon dioxide phase, and the proportion in the total solid phase is > 50%; dry density: < 650kg / m 3 , the proportion of holes with a pore size of < 1mm is > 50%.

[0009] The autoclaved aerated concrete raw material comprises calcium material: lime, cement (or ore powder or steel slag powder), silicon material: quartz sand (or fly ash or tailings powder), retarder: gypsum, foaming agent: aluminum powder or aluminum paste and surfactant. The weight percentage of each raw material component of the autoclaved aerated concrete is: lime: cement (or ore powder or steel slag powder): gypsum: quartz sand (or fly ash or tailings powder) = (5-25): (5-25): (1-7): (50-75), the aluminum powder or aluminum paste is 0.05-0.3% of the total weight of the above raw materials, the water is 50-60% of the total weight of the above raw materials, and the surfactant is 0.01-0.1% of the total weight of the above raw materials.

[0010] The synergist is a basic type phase change energy-saving synergist, an improved type phase change energy-saving synergist or a reinforced type phase change energy-saving synergist.

[0011] The coating inorganic salt material in the basic type phase change energy-saving synergist is added in an amount of 0.8-10% of the total weight of the raw materials, and the adjusting material is 0.05-1% of the total weight of the raw materials; the barrier material of solid phase change is added in an amount of 2.5-15% of the total weight of the raw materials on the basis of the amount of the basic type phase change energy-saving synergist; the reflective material of solid phase change is added in an amount of 1-5% of the total weight of the raw materials on the basis of the amount of the improved type phase change energy-saving synergist. The total weight of the autoclaved aerated concrete raw material refers to the total weight of the calcium material, the silicon material and the retarder gypsum.

[0012] The main material of the basic type phase change energy-saving synergist is an inorganic salt material, and the auxiliary material includes an adjusting material, a foam stabilizing material and a bonding material, wherein the weight percentage of the inorganic salt material, the bonding material and the foam stabilizing material is (75-85):(14.5-24.5):(0.3-0.5), and the adding amount is 0.8-10% of the total weight of the autoclaved aerated concrete raw material, and the adding amount of the adjusting material is 0.05-1% of the total weight of the autoclaved aerated concrete raw material.

[0013] The improved type phase change energy-saving synergist is composed of the basic type phase change energy-saving synergist and the barrier material of solid phase change. The adding amount of the barrier material of solid phase change is 2.5-15% of the total weight of the autoclaved aerated concrete raw material.

[0014] The reinforced type phase change energy-saving synergist is composed of the improved type phase change energy-saving synergist and the reflective material of solid phase change. The adding amount of the reflective material of solid phase change is 1-5% of the total weight of the autoclaved aerated concrete raw material.

[0015] The inorganic salt material is bicarbonate, carbonate or a mixture thereof, and preferably sodium bicarbonate or sodium carbonate or a mixture thereof.

[0016] The adjusting material includes one or more of phosphate, metaphosphate, hydroxyl carboxylate, boride, and the adjusting material is preferably sodium hexametaphosphate in metaphosphate, sodium pyrophosphate, sodium tripolyphosphate, hydroxyl carboxylate, boric acid and its salt, which aims to control the dissolution rate of calcium ions in the hydration reaction and ensure the realization of double hydrolysis.

[0017] The foam stabilizing material includes one or more of acrylic emulsion, sodium polyacrylate, polyacrylamide, hydroxypropyl methyl cellulose and its salt, carboxymethyl cellulose and its salt, emulsified silicone oil, polyvinyl alcohol, xanthan gum, stearic acid and its salt, and paraffin.

[0018] The main material of the bonding material includes starch, white latex, and the auxiliary material includes one or more of resin, alcohol, acrylate and its copolymer emulsion, and the weight percentage of the main material and the auxiliary material is: (50-100): (0-50).

[0019] The solid phase change barrier material includes one or more of sericite powder, amorphous silicon dioxide, vermiculite powder, diatomite powder, and rubber powder; the particle size of the amorphous silicon dioxide is <1 μm, preferably <0.5 μm.

[0020] The solid phase change reflective material includes one or more of titanium dioxide powder, ceramic powder, and modified potassium titanate whisker powder.

[0021] The modified potassium titanate whisker powder is composed of potassium titanate whisker powder and a modifier polyether siloxane, and the weight percentage of the solid phase change reflective material potassium titanate whisker powder and the modifier is (87-95):(5-13).

[0022] The application method of the autoclaved aerated concrete phase change energy-saving synergist is to add it into autoclaved aerated concrete to prepare low-thermal-conductivity autoclaved aerated concrete products.

[0023] The thermal conductivity of the autoclaved aerated concrete product is: B03 ≤0.055 W / m 2 ·K, B04 ≤0.067 W / m 2 ·K, B05 ≤0.087 W / m 2 ·K, B06 ≤0.10 W / m 2 ·K.

[0024] The preparation method of the basic type phase change energy-saving synergist is:

[0025] Put water into the blender, add the binding material while stirring, stirring rate 700-900r / min, stirring time 10-20min, make it into sticky colloid, add the foam stabilizing material, stir evenly, stirring rate 700-900r / min, stirring 7-10min, get the dilute sticky liquid, put the inorganic salt material into the boiling coating machine, add the dilute sticky liquid through the spraying machine, coat in the boiling coating machine, coating temperature is 50-60℃, according to the total weight of autoclaved aerated concrete raw materials 0.8-10%, weigh it, and add the adjusting material according to the total weight of autoclaved aerated concrete raw materials 0.05-1%, get the basic type phase change energy-saving synergist.

[0026] The preparation method of the improved type phase change energy-saving synergist is that: on the basis of the basic type phase change energy-saving synergist, 2.5-15% of the solid phase change barrier material of the total weight of autoclaved aerated concrete raw materials is added, to obtain the improved type phase change energy-saving synergist.

[0027] The preparation method of the improved type phase change energy-saving synergist is that: on the basis of the basic type phase change energy-saving synergist, 2.5-15% of the solid phase change barrier material of the total weight of autoclaved aerated concrete raw materials is added, to obtain the improved type phase change energy-saving synergist.

[0028] The main material of the autoclaved aerated concrete phase change energy-saving synergist in the application is inorganic salt material, the auxiliary material includes binding material, foam stabilizing material and adjusting material, the main material in the basic type phase change energy-saving synergist is preferably sodium bicarbonate, sodium carbonate or mixture thereof, the prepared synergist is added into the slurry of autoclaved aerated concrete products, the aluminum powder or aluminum paste is hydrolyzed to produce H ﹢ in the alkaline environment, the sodium bicarbonate or sodium carbonate in the synergist is hydrolyzed to produce HCO3 – or CO3 2– , H ﹢ and HCO3 – or CO3 2– combine to generate H2CO3, H2CO3 is unstable and is decomposed into CO2 and water, the gaseous hydrogen is replaced by carbon dioxide gas, which has the advantages that: first, the thermal conductivity of carbon dioxide gas is lower than that of hydrogen gas, the thermal conductivity of carbon dioxide is 0.0143W / m 2The third is that the carbon dioxide can carry out carbonation reaction with the hydrated calcium silicate, calcium aluminate, unreacted calcium hydroxide and other substances in the product, and the main products are calcium carbonate and silicon dioxide, etc., so that the gas holes in the product form partial vacuum, improve the heat preservation and thermal insulation performance of the product, and increase the compactness of the product, and improve the compression resistance, frost resistance, carbonization resistance, dimensional stability, fire resistance and fire extinguishing performance of the product.

[0029] The main material of the cementing material in the autoclaved aerated concrete phase change energy-saving synergist in the application is preferably dextrin and white latex, the foam stabilizing material is preferably sodium carboxymethyl cellulose, sodium hydroxypropyl methyl cellulose, emulsified silicone oil, sodium polyacrylate, polyacrylamide, xanthan gum, polyvinyl alcohol, acrylic latex, stearic acid and its salts, etc., and sodium bicarbonate or sodium carbonate is coated with the above materials, which can improve the moisture resistance and anti-variation ability of sodium bicarbonate or sodium carbonate, facilitate mechanized production, and dextrin and white latex are easily dissolved in water, and can be used with auxiliary materials to slowly release sodium bicarbonate or sodium carbonate in the slurry, reduce the double hydrolysis speed, facilitate production operation, and the addition of sodium carboxymethyl cellulose and other foam stabilizers increases the viscosity of the slurry, improves the bubble stability, and helps sodium hexametaphosphate, sodium pyrophosphate, sodium tripolyphosphate, hydroxyl carboxylate, boric acid and its salts to complex calcium and magnesium ions, and reduce the pH value of the slurry. The pH value of the autoclaved aerated concrete slurry is > 11.36, and the bicarbonate or carbonate ions therein are difficult to exist, and the preferred sodium hexametaphosphate and other materials are used as adjusting materials to reduce the alkalinity of the slurry to form double hydrolysis and produce carbon dioxide, at the same time, the expansion speed of the slurry is controlled to prevent bubble and bubble stringing phenomenon, form uniform pore structure, ensure that the beneficial holes with an internal diameter < 1mm are close to 100%, improve the heat preservation and thermal insulation performance of the product, and improve the flowability of the slurry.

[0030] The promotion type and the strengthening type synergist components of the autoclaved aerated concrete phase change energy-saving synergist in the application include solid phase change barrier materials and solid phase change reflective materials, the application uses amorphous silicon dioxide as the solid phase change barrier material, because the amorphous silicon dioxide particles are fine, most of the particle sizes are less than 0.1 μm, the specific surface area is large, a large number of interface regions are introduced into the slurry, a large number of interface regions absorb phonons generated by thermal vibration, slow down the transfer of heat flow, and thus reduce the thermal conductivity of the product to a certain extent. Diatomite powder is used as the barrier material, and the internal water of the diatomite is released during the maintenance of the product, which has a good maintenance and strengthening effect on the product. After the internal water is released, a vacuum is formed in the diatomite, which delays the conduction of heat energy and heat radiation, and reduces the thermal conductivity of the product. The application uses sericite powder as the solid phase change barrier material, mainly uses the sandwiched structure of sericite, which has the characteristics of low iron content, good heat resistance and low thermal conductivity, and is easy to prevent heat transfer. The barrier has strong barrier ability to ultraviolet and infrared rays, when heat is transferred to these layers, it is blocked, reflected and scattered to change direction, the path of heat transfer is lengthened, the thermal conductivity is reduced, and the heat preservation performance is improved.

[0031] The application uses modified potassium titanate whisker powder, titanium dioxide powder and the like as raw materials as solid phase change reflective materials for producing autoclaved aerated concrete products, which aims to solve the problem of large solid phase thermal conductivity. The potassium titanate whisker powder and the titanium dioxide powder have a reflection function to white and infrared light, and the reflectivity is more than 90%. The use thereof can reduce the heat energy entering the product, reduce the heat conduction rate, and improve the heat preservation and insulation performance of the product. The polyether siloxane material is used as a modifier, the potassium titanate whisker has a fine particle size and is easy to form agglomeration during stirring. After modification, the suspension performance is good, the hydrophobicity is enhanced, the water absorption of the product is reduced, and the frost resistance of the product is improved. By increasing the barrier and reflective material components of the solid phase, the solid phase thermal conductivity is reduced, and the heat preservation performance of the product is improved. Furthermore, the double hydrolysis of aluminum powder or aluminum paste and sodium bicarbonate (or sodium carbonate) in the slurry does not need external heat energy, which overcomes the disadvantages of traditional autoclaved aerated concrete products, i.e. a large amount of heat energy is needed for aluminum powder or aluminum paste to generate gas during stirring, pouring and pre-maintenance. Moreover, the demolding time is shortened by 30-50 minutes compared with the traditional process, energy is saved, cost is reduced, and carbon dioxide emission is reduced.

[0032] Compared with the prior art, the application has the beneficial effects that:

[0033] (1) The autoclaved aerated concrete phase change energy-saving synergist prepared by the method of the present application, by adopting the technical measures of upgrading and synergizing of the coated bicarbonate or carbonate material of gas phase change, the barrier material of solid phase change and the reflective material of solid phase change, compared with the traditional autoclaved aerated concrete product, the thermal conductivity is reduced, the product thermal insulation performance is improved, the traditional autoclaved aerated concrete product single material can meet the building energy-saving standard requirements, without the need for secondary composite organic insulation material, so that the building construction is more simple and convenient, the building cost is reduced, the building efficiency is improved, and the building fire safety is enhanced.

[0034] (2) The autoclaved aerated concrete phase change energy-saving synergist prepared by the method of the present application is applied to autoclaved aerated concrete blocks and wallboards, so that the aluminum powder or aluminum paste in the slurry and sodium bicarbonate or sodium carbonate undergo double hydrolysis reaction to generate a large amount of heat energy, compared with the traditional process, without the need for external large amount of heat energy, the self-heat can meet the temperature requirement of the reaction in the stirring and pouring stage, the pre-curing time is shortened by 30-50 min, the energy is saved, the cost is reduced, and the carbon dioxide emission is reduced.

[0035] (3) The synergist of the present application saves a large amount of technical research and development and equipment modification funds for national autoclaved aerated concrete product production enterprises in product upgrading. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The internal pore structure diagram of the section of the autoclaved aerated concrete product prepared for Comparative Example 7 (a).

[0037] Figure 2 The internal pore structure diagram of the section of the autoclaved aerated concrete product prepared for Comparative Example 7 (b).

[0038] Figure 3 The internal pore structure diagram of the section of the autoclaved aerated concrete product prepared for Comparative Example 7 (c).

[0039] Figure 4 The internal pore structure diagram of the section of the autoclaved aerated concrete product prepared for Comparative Example 7 (d).

[0040] Figure 5 The internal pore structure diagram of the section of the autoclaved aerated concrete product prepared for Example 1.

[0041] Figure 6 The internal pore structure diagram of the section of the autoclaved aerated concrete product prepared for Example 2.

[0042] Figure 7 The internal pore structure diagram of the section of the autoclaved aerated concrete product prepared for Example 4.

[0043] Figure 8 Cross-section internal pore structure of autoclaved aerated concrete product prepared for Example 6.

[0044] Figure 9 XRD pattern of autoclaved aerated concrete product prepared for Comparative Example 7 (a).

[0045] Figure 10 XRD pattern of autoclaved aerated concrete product prepared for Example 4. DETAILED DESCRIPTION

[0046] The application will be further described in conjunction with specific examples.

[0047] The raw materials or chemical additives used in the following examples and comparative examples are all commercially available.

[0048] Example 1

[0049] Take 24.5 g of dextrin, 75 g of sodium bicarbonate and 0.5 g of emulsified silicone oil by weight percentage, put the water weighed 3 times the dextrin into a blender, add the dextrin while stirring, the stirring rate is 800 r / min, stir for 15 min, make it into a sticky colloid, then put the weighed emulsified silicone oil into the dextrin colloid and stir evenly, the stirring rate is 800 r / min, stir for 9 min, then put the weighed sodium bicarbonate into a boiling coater, pass the stirred thin sticky liquid through a spray machine to coat in the boiling coater, the coating temperature is 55℃; weigh 10% of the total weight of autoclaved aerated concrete raw materials, mix with sodium hexametaphosphate weighed 1% of the total weight of autoclaved aerated concrete raw materials to obtain a basic type phase change energy-saving synergist.

[0050] The application of the basic type phase change energy-saving synergist carries out double hydrolysis reaction with the foaming agent aluminum powder in the autoclaved aerated concrete raw materials, the directly generated gas phase is carbon dioxide phase, the generated solid phase is mainly calcium carbonate phase and silicon dioxide phase, and the proportion in the total solid phase is > 50%; dry density: < 650 kg / m 3, the proportion of holes with a diameter of <1mm is >50%. The specific steps are as follows: according to the percentage of each raw material component of autoclaved aerated concrete, 94g of lime, 70.5g of cement, 23.5g of gypsum, 282g of fine quartz sand, 282g of water, 1.41g of aluminum powder, and 0.24g of surfactant are weighed, 47g of sodium bicarbonate coated with the basic energy-saving enhancer prepared above is weighed according to 10% of the total weight of the above raw materials, and 4.7g of sodium hexametaphosphate is weighed according to 1% of the total weight of the raw materials in the autoclaved aerated concrete, the weighed lime, cement, gypsum, and fine quartz sand are mixed into a uniform powder in a blender, most of the measured water is mixed with the surfactant and sodium hexametaphosphate in the above basic energy-saving enhancer to form a uniform water body, and then the uniform water body is added to the uniform powder to form a uniform slurry, then the remaining measured water is mixed with the aluminum powder to form a uniform aluminum slurry, then the uniform slurry is sequentially added to the uniform aluminum slurry, and the measured coated sodium bicarbonate is quickly stirred for 30s, then it is placed in a mold box, and the gas is allowed to stand and generate, and then it is shaped, demolded, cut, and autoclaved at high temperature in an autoclave, and then it is taken out of the autoclave to obtain an autoclaved aerated concrete product.

[0051] Example 2

[0052] According to the weight percentage, 15g of dextrin, 7.5g of epoxy resin, 77g of sodium bicarbonate, and 0.5g of sodium polyacrylate are weighed, the water containing 3 times the weighed dextrin and epoxy resin is placed in a blender, the dextrin and epoxy resin are added while stirring, the stirring rate is 700r / min, and the stirring time is 20min, so that the dextrin and epoxy resin become a viscous colloid, then the weighed sodium polyacrylate is placed in the dextrin and epoxy resin colloid and stirred uniformly, the stirring rate is 700r / min, and the stirring time is 10min, then the weighed sodium bicarbonate is placed in a boiling coater, the stirred viscous liquid is coated in the boiling coater by a spraying machine, the coating temperature is 50℃, and the basic phase change energy-saving enhancer is obtained by weighing 8% of the total weight of the autoclaved aerated concrete raw materials and mixing it with 0.5% of sodium hexametaphosphate according to the total weight of the raw materials in the autoclaved aerated concrete.

[0053] The basic phase change energy-saving enhancer is used for double hydrolysis reaction with the foaming agent aluminum powder or aluminum paste in the autoclaved aerated concrete raw materials, directly generates a gas phase of carbon dioxide, and generates a solid phase mainly composed of calcium carbonate and silicon dioxide, and the proportion of the total solid phase is >50%, and the dry density is <650kg / m 3, the proportion of holes with a diameter of <1mm is >50%. The specific steps are as follows: 54g of lime, 108g of cement, 27g of gypsum, 261g of fine quartz sand, 225g of water, 1.35g of aluminum paste, and 0.45g of surfactant are weighed according to the percentage of each raw material component of autoclaved aerated concrete, 36g of sodium bicarbonate coated with the basic energy-saving enhancer prepared above is weighed according to 8% of the total weight of the above raw materials, and 2.25g of sodium hexametaphosphate is weighed according to 0.5% of the total weight of the above raw materials, the weighed lime, cement, gypsum, and fine quartz sand are mixed into a uniform powder in a blender, most of the measured water is mixed with the surfactant and sodium hexametaphosphate in the above basic energy-saving enhancer to form a uniform water body, the uniform water body is then added to the uniform powder, and the mixture is stirred into a uniform slurry, then the remaining measured water is stirred with the aluminum paste to form a uniform aluminum paste slurry, the uniform aluminum paste slurry and the measured coated sodium bicarbonate are then sequentially added to the uniform slurry, stirred quickly for 30s, placed in a mold box, allowed to stand and generate gas, and then shaped, demolded, cut, and autoclaved at high temperature to obtain an autoclaved aerated concrete product.

[0054] Example 3

[0055] White latex 20.5g, sodium bicarbonate 79.1g, sodium carboxymethyl cellulose 0.2g, and paraffin 0.2g are weighed according to the weight percentage, the water 3 times the weight of the white latex is placed in a blender, the white latex is added while stirring, the stirring rate is 900r / min, and the stirring time is 10min, so that it becomes a sticky colloid, then the weighed sodium carboxymethyl cellulose and paraffin are placed in the white latex colloid and stirred uniformly, the stirring rate is 900r / min, and the stirring time is 7min, then the weighed sodium bicarbonate is placed in a boiling coater, the stirred thin sticky liquid is coated in the boiling coater by a spraying machine, the coating temperature is 60℃, and a basic phase change energy-saving enhancer is obtained by weighing 5% of the total weight of the autoclaved aerated concrete raw materials and mixing it with 0.05% of sodium hexametaphosphate according to the total weight of the raw materials in the autoclaved aerated concrete.

[0056] The basic phase change energy-saving enhancer is used for double hydrolysis reaction with the foaming agent aluminum paste in the autoclaved aerated concrete raw materials, directly generating a gas phase of carbon dioxide phase and a solid phase mainly composed of calcium carbonate phase and silicon dioxide phase, and the proportion of the total solid phase is >50%; the dry density is <650kg / m 3, the proportion of holes with a diameter of <1mm is >50%. The specific steps are as follows: according to the percentage of each raw material component of autoclaved aerated concrete, 94g of lime, 70.5g of cement, 23.5g of gypsum, 282g of fine quartz sand, 282g of water, 1.27g of aluminum paste, and 0.24g of surfactant are weighed, 23.5g of the basic type energy-saving synergist coated sodium bicarbonate prepared above is weighed according to 5% of the total weight of the above raw materials, and 0.235g of sodium hexametaphosphate is weighed according to 0.05% of the total weight of the above raw materials. The weighed lime, cement, gypsum, and fine quartz sand are mixed into a uniform powder in a blender. The majority of the measured water is mixed with the surfactant and sodium hexametaphosphate in the above basic type energy-saving synergist to form a uniform water body. Then, the uniform water body is added to the uniform powder, and the mixture is stirred into a uniform slurry. Then, the remaining measured water and aluminum paste are stirred into a uniform aluminum paste slurry. Then, the uniform aluminum paste slurry and the measured coated sodium bicarbonate are sequentially added to the uniform slurry, stirred rapidly for 40s, placed in a mold box, and allowed to stand for gas evolution. After standing, shaping, demolding, cutting, and entering the autoclave for high-temperature autoclaving, the autoclaved aerated concrete product is obtained.

[0057] Example 4

[0058] According to the weight percentage, 17g of dextrin, 4.7g of ethylene glycol, 78g of sodium bicarbonate, 0.15g of polyacrylamide, and 0.15g of xanthan gum are weighed. The 3 times dextrin and ethylene glycol water are placed in a blender, and the dextrin and ethylene glycol are added while stirring at a stirring rate of 800r / min for 15min to form a sticky colloid. Then, the polyacrylamide and xanthan gum are placed in the dextrin and ethylene glycol colloid and stirred uniformly at 800r / min for 8min. Then, the weighed sodium bicarbonate is placed in a boiling coater, and the stirred thin sticky liquid is coated in the boiling coater through a spray machine at a coating temperature of 55℃. According to the total weight of the autoclaved aerated concrete raw materials, 5% of its weight is weighed, and borax is weighed according to 1% of the total weight of the autoclaved aerated concrete raw materials. According to the total weight of the autoclaved aerated concrete raw materials, 12% of amorphous silicon dioxide and 3% of rubber powder are weighed to obtain a promotion type phase change energy-saving synergist.

[0059] The application of the promotion type phase change energy-saving synergist carries out double hydrolysis reaction with the foaming agent aluminum paste in the autoclaved aerated concrete raw materials, directly generates gas phase carbon dioxide phase, and generates solid phase mainly calcium carbonate phase and silicon dioxide phase, and the proportion in the total solid phase is >50%. The dry density is <650kg / m 3, the proportion of holes with a pore size of <1 mm is >50%. The specific steps are as follows: according to the percentage of each raw material component of autoclaved aerated concrete, 72g of lime, 96g of cement, 24g of gypsum, 288g of fine quartz sand, 276g of water, 1.2g of aluminum powder paste, and 0.48g of surfactant are weighed, 24g of coated sodium bicarbonate prepared above is weighed according to 5% of the total weight of raw materials, 4.8g of borax is weighed according to 1% of the total weight of raw materials, 57.6g of amorphous silicon dioxide is weighed according to 12% of the total weight of raw materials, and 14.4g of rubber powder is weighed according to 3% of the total weight of raw materials, the amorphous silicon dioxide and the gypsum in the promotion type phase change energy saving and efficiency improving agent are uniformly mixed in a blender, then the fine quartz sand is uniformly stirred, then the cement is uniformly stirred, then the lime is uniformly stirred, the majority of the measured water, the surfactant, and the borax are uniformly mixed, and then they are added to the above-mentioned mixed powder for stirring into a uniform slurry, the aluminum powder paste is added to the remaining measured water, which is uniformly stirred in another blender, and then it is added to the above-mentioned uniform slurry, the measured coated sodium bicarbonate is sequentially added, and then it is quickly stirred for 40s, and then it is placed into a mold box for static standing, gas evolution, static curing, demolding, cutting, autoclave high temperature autoclaving, autoclave discharge, and finally autoclaved aerated concrete products are obtained.

[0060] Example 5

[0061] According to the weight percentage, 15g of dextrin, 4.5g of styrene-acrylic emulsion, 80g of sodium bicarbonate, and 0.5g of sodium hydroxypropyl methyl cellulose are weighed, the measured 3 times dextrin and styrene-acrylic emulsion water are put into a blender, the dextrin and styrene-acrylic emulsion are added while stirring at a stirring rate of 900r / min for 10min, so as to become a viscous colloid, then the measured sodium hydroxypropyl methyl cellulose is put into the dextrin and styrene-acrylic emulsion colloid and stirred uniformly at 900r / min for 7min, then the measured sodium bicarbonate is put into a boiling coating machine, the stirred thin viscous liquid is coated in the boiling coating machine through a spraying machine at a coating temperature of 60℃, and then a promotion type phase change energy saving and efficiency improving agent is obtained by weighing its weight according to 5% of the total weight of autoclaved aerated concrete raw materials, weighing sodium pyrophosphate according to 0.4% of the total weight of autoclaved aerated concrete raw materials, and weighing amorphous silicon dioxide according to 2.5% of the total weight of autoclaved aerated concrete raw materials.

[0062] The application of the promotion type phase change energy saving and efficiency improving agent causes double hydrolysis reaction with the foaming agent aluminum powder paste in the autoclaved aerated concrete raw materials, directly generates gas phase of carbon dioxide phase, and generates solid phase mainly of calcium carbonate phase and silicon dioxide phase, and the proportion of the total solid phase is >50%; the dry density is <650kg / m 3Holes with diameter <1mm account for >50%. The specific steps are as follows: according to the percentage of each raw material component of autoclaved aerated concrete, 72g of lime, 96g of cement, 24g of gypsum, 288g of fine quartz sand, 276g of water, 1.15g of aluminum paste, and 0.48g of surfactant are weighed; 24g of coated sodium bicarbonate prepared above is weighed according to 5% of the total weight of raw materials; 1.92g of sodium pyrophosphate is weighed according to 0.4% of the total weight of raw materials; and 12g of amorphous silicon dioxide is weighed according to 2.5% of the total weight of raw materials; the amorphous silicon dioxide in the promotion type phase change energy-saving synergist is mixed with the gypsum in a blender, then the fine quartz sand is added and stirred uniformly, then the cement is added and stirred uniformly, then the lime is added and stirred uniformly, most of the measured water, the surfactant, and the sodium pyrophosphate are mixed uniformly, and then added to the above-mentioned mixed powder for stirring into a uniform slurry; the aluminum paste is added to the remaining measured water, stirred uniformly in another blender, and then added to the above-mentioned uniform slurry; the measured coated sodium bicarbonate is sequentially added, stirred rapidly for 40s, placed in a mold box, and then allowed to stand for gas evolution, static curing, demolding, cutting, and autoclaving at high temperature to obtain an autoclaved aerated concrete product.

[0063] Example 6

[0064] According to the weight percentage, 12.6g of dextrin, 2g of pure propylene emulsion, and 85g of sodium carbonate are weighed, and 0.4g of polyvinyl alcohol is weighed; the 3 times dextrin and pure propylene emulsion water are placed in a blender, and the dextrin and pure propylene emulsion are added while stirring at a stirring rate of 800r / min for 8min to make a viscous colloid; the weighed polyvinyl alcohol is placed in the dextrin and pure propylene emulsion colloid and stirred uniformly at a stirring rate of 800r / min for 8min; the weighed sodium carbonate is placed in a boiling coating machine, and the stirred viscous liquid is coated in the boiling coating machine by a spraying machine at a coating temperature of 50℃; the weight percentage of the promotion type phase change energy-saving synergist is 0.8% of the total weight of autoclaved aerated concrete raw materials, the weight percentage of sodium tripolyphosphate is 0.25% of the total weight of autoclaved aerated concrete raw materials, the weight percentage of diatomite powder is 5% of the total weight of autoclaved aerated concrete raw materials, and the weight percentage of vermiculite powder is 1%; the weight percentage of potassium titanate whisker powder is 95g, and the weight percentage of methyl silicone oil is 5g; the potassium titanate whisker powder is placed in a drying oven at 120℃ for 1.5h to remove adsorbed water; the dried potassium titanate whisker powder and the weighed methyl silicone oil are mixed in deionized water, heated at 100℃, stirred at a stirring speed of 600r / min for 8min, filtered, dried in a drying oven at 100℃ for 2h, 60℃ for 15h, and 30℃ for 30h, ground and crushed, and then mixed with the above-mentioned promotion type phase change energy-saving synergist to obtain a reinforced phase change energy-saving synergist.

[0065] The application of the reinforced phase change energy-saving synergist carries out double hydrolysis reaction with the foaming agent aluminum paste in the autoclaved aerated concrete raw material, directly generates gas phase of carbon dioxide phase, and generates solid phase mainly of calcium carbonate phase and silicon dioxide phase, and the proportion in the total solid phase is > 50%; dry density: < 650 kg / m 3 , pore size: < 1 mm, > 50%. The specific steps are: according to the percentage of each raw material component of autoclaved aerated concrete, take lime 65g, cement 110g, gypsum 35g, fine quartz sand 290g, water 275g, aluminum paste 0.5g, surfactant 0.05g, take 4g of 0.8% of the prepared reinforced phase change energy-saving synergist coated sodium carbonate, take 1.25g of 0.25% of sodium tripolyphosphate, take 25g of 5% of diatomite powder, take 5g of 1% of vermiculite powder, take 15g of 3% of modified potassium titanate whisker powder, take 5g of 1% of titanium dioxide powder, and take 5g of 1% of ceramic powder. The measured diatomite powder, vermiculite powder and gypsum are stirred uniformly, the fine quartz sand is added and stirred uniformly, then the cement is added and stirred uniformly, then the lime is added and stirred uniformly, and finally the modified potassium titanate whisker powder, titanium dioxide powder and ceramic powder are added and stirred uniformly. Mix the most of the measured water, surfactant and sodium tripolyphosphate uniformly and add them to the mixed uniform powder to stir into a uniform slurry. Add the aluminum paste to the remaining measured water, stir uniformly into an aluminum paste slurry in another stirrer, add it to the aforementioned uniform slurry, add the measured coated sodium carbonate in turn, stir quickly for 30s, put it into a mold box, stop and rest for gasification, static curing, demolding, cutting, enter autoclave high temperature autoclaving, out of the autoclave, get autoclaved aerated concrete product.

[0066] Example 7

[0067] According to the weight percentage, 14.6g of dextrin, 85g of sodium carbonate, 0.2g of calcium stearate and 0.2g of acrylic latex are weighed, the weighed 3 times dextrin water is put into a blender, the dextrin is added while stirring, the stirring rate is 700r / min, and the stirring time is 10min, so that it becomes a sticky colloid, the weighed calcium stearate and acrylic latex are put into the dextrin colloid and stirred uniformly, the stirring rate is 700r / min, and the stirring time is 10min, the weighed sodium carbonate is put into a boiling coater, the stirred thin sticky liquid is coated in the boiling coater through a spraying machine, the coating temperature is 60℃, 1% of the total weight of autoclaved aerated concrete raw materials is weighed, 0.25% of the total weight of autoclaved aerated concrete raw materials is added according to the total weight of autoclaved aerated concrete raw materials, 5% of diatomite powder and 2% of sericite powder are added according to the total weight of autoclaved aerated concrete raw materials, and a promotion type phase change energy-saving synergist is obtained; according to the weight percentage, 87g of potassium titanate whisker powder and 13g of methyl silicone oil are weighed, the potassium titanate whisker powder is placed in a drying oven at 120℃ for 1.5h to dry and remove adsorbed water; the dried potassium titanate whisker powder and the weighed methyl silicone oil are mixed in deionized water, heated at 100℃, stirred at a speed of 600r / min for 10min, filtered, dried in a drying oven at 100℃ for 2h, 60℃ for 15h and 30℃ for 30h, ground and crushed, and then mixed with the promotion type phase change energy-saving synergist prepared above to obtain a reinforced phase change energy-saving synergist.

[0068] The reinforced phase change energy-saving synergist is used for double hydrolysis reaction with the foaming agent aluminum paste in the autoclaved aerated concrete raw materials, the directly generated gas phase is carbon dioxide phase, the generated solid phase is mainly calcium carbonate phase and silicon dioxide phase, and the proportion in the total solid phase is >50%; the dry density is <650kg / m 3, the proportion of holes with a pore size of <1 mm is >50%. The specific steps are as follows: 65 g of lime, 110 g of cement, 35 g of gypsum, 290 g of fine quartz sand, 275 g of water, 0.5 g of aluminum paste, and 0.35 g of surfactant are weighed according to the percentage of each raw material component of autoclaved aerated concrete; 5 g of the prepared reinforced phase change energy-saving synergist coated sodium carbonate is weighed at 1% of the total weight of the raw materials; 1.25 g of sodium tripolyphosphate is weighed at 0.25%; 25 g of diatomite powder is weighed at 5%; 10 g of sericite powder is weighed at 2%; and 5 g of modified potassium titanate whisker powder is weighed at 1%. The diatomite powder, sericite powder, and gypsum are stirred uniformly, the fine quartz sand is added and stirred uniformly, then the cement is added and stirred uniformly, the lime is added and stirred uniformly, and finally the modified potassium titanate whisker powder is added and stirred uniformly. The remaining water, surfactant, and sodium tripolyphosphate are mixed uniformly and added to the mixed uniform powder to form a uniform slurry. The aluminum paste is added to the remaining water, which is stirred uniformly in another stirrer to form an aluminum paste slurry. The aluminum paste slurry is added to the aforementioned uniform slurry, and the coated sodium carbonate is added in sequence. The mixture is stirred rapidly for 30 s, placed in a mold box, allowed to stand and aerate, and then shaped, demolded, cut, and autoclaved at high temperature to obtain an autoclaved aerated concrete product.

[0069] Comparative Example 1

[0070] Compared with Example 1, only the sodium bicarbonate coated with dextrin and emulsified silicone oil is not added, and the remaining raw materials, the weight percentage of each raw material, and the production process of autoclaved aerated concrete are the same. The prepared autoclaved aerated concrete product has a hydrogen gas phase and a large thermal conductivity. The technical performance is shown in Table 1.

[0071] Comparative Example 2

[0072] Compared with Example 1, only the sodium bicarbonate coated with dextrin and emulsified silicone oil is not added, and the remaining raw materials, the weight percentage of each raw material, and the production process of autoclaved aerated concrete are the same. The prepared autoclaved aerated concrete product has a hydrogen gas phase and a large thermal conductivity. The technical performance is shown in Table 1.

[0073] Comparative Example 3

[0074] Compared with Example 1, the sodium bicarbonate is not coated with a binding material and a foam stabilizing material, but is directly added according to the weight percentage of the raw materials. The remaining raw materials, the weight percentage of each raw material, and the production process of autoclaved aerated concrete are the same. The slurry is thickened quickly during stirring, which makes it difficult to pour and form the product.

[0075] Comparative Example 4

[0076] Compared with Example 4, the basic phase change energy-saving synergist and the modified potassium titanate whisker micro powder are not added, only the amorphous silicon dioxide is added according to the weight percentage of raw materials, the remaining raw materials, the weight percentage of each raw material and the autoclaved aerated concrete production process are the same, the autoclaved aerated concrete product is prepared, the gas phase is hydrogen, the thermal conductivity is large, and the technical performance is as shown in Table 1.

[0077] Comparative Example 5

[0078] Compared with Example 6, the basic phase change energy-saving synergist is not added, only the diatomite micro powder and the modified potassium titanate whisker micro powder are added according to the weight percentage of raw materials, the remaining raw materials, the weight percentage of each raw material and the autoclaved aerated concrete production process are the same, the autoclaved aerated concrete product is prepared, the gas phase is hydrogen, the thermal conductivity is large, and the technical performance is as shown in Table 1.

[0079] Comparative Example 6

[0080] Compared with Example 6, the basic phase change energy-saving synergist and the diatomite micro powder are not added, only the modified potassium titanate whisker micro powder is added according to the weight percentage of raw materials, the remaining raw materials, the weight percentage of each raw material and the autoclaved aerated concrete production process are the same, the autoclaved aerated concrete product is prepared, the gas phase is hydrogen, the thermal conductivity is large, and the technical performance is as shown in Table 1.

[0081] Comparative Example 7

[0082] The autoclaved aerated concrete product is prepared without adding the phase change energy-saving synergist.

[0083] Comparative Example 7(a)

[0084] 93g of lime, 46.5g of cement, 311.55g of fine quartz sand, 13.95g of gypsum, 0.651g of aluminum powder paste, 0.465g of surfactant, 279g of water at 50°C are weighed, the quartz sand, the gypsum and the part of water are stirred into a slurry, the cement is added into the slurry and stirred, then the lime is continuously added and stirred into a uniform slurry, the remaining water and the aluminum powder paste are stirred into a uniform paste slurry, the paste slurry is added into the slurry, and the mixture is quickly stirred for 30s, then poured into a mold box, and the mold box is left to stand for gas evolution, pre-cured at a temperature of 55°C, demolded and cut, and then put into a autoclave for high-temperature autoclaving, and finally taken out of the autoclave to obtain a traditional autoclaved aerated concrete product, and the technical performance is as shown in Table 1.

[0085] Comparative Example 7(b)

[0086] Take lime 93g, cement 46.5g, fine quartz sand 311.55g, gypsum 13.95g, aluminum paste 0.512g, surfactant 0.465g, 50℃ water 279g, first mix the quartz sand, gypsum and the measured part of the water into a slurry, add the cement into the slurry and stir, then add the lime and continue to stir into a uniform slurry, mix the remaining water and aluminum paste into a uniform paste slurry, add the paste slurry into the slurry, stir quickly for 30s, pour into the mold box, stop and gasify, pre-nurture and solidify at 55℃, demold and cut, enter the kettle for high-temperature autoclaving, and get out of the kettle to get traditional autoclaved aerated concrete products, the technical performance is as shown in Table 1.

[0087] Comparative Example 7 (c)

[0088] Take lime 93g, cement 46.5g, fine quartz sand 311.55g, gypsum 13.95g, aluminum paste 0.512g, surfactant 0.465g, 50℃ water 279g, first mix the quartz sand, gypsum and the measured part of the water into a slurry, add the cement into the slurry and stir, then add the lime and continue to stir into a uniform slurry, mix the remaining water and aluminum paste into a uniform paste slurry, add the paste slurry into the slurry, stir quickly for 30s, pour into the mold box, stop and gasify, pre-nurture and solidify at 55℃, demold and cut, enter the kettle for high-temperature autoclaving, and get out of the kettle to get traditional autoclaved aerated concrete products, the technical performance is as shown in Table 1.

[0089] Comparative Example 7 (d)

[0090] Take lime 93g, cement 46.5g, fine quartz sand 311.55g, gypsum 13.95g, aluminum paste 0.512g, surfactant 0.465g, 50℃ water 279g, first mix the quartz sand, gypsum and the measured part of the water into a slurry, add the cement into the slurry and stir, then add the lime and continue to stir into a uniform slurry, mix the remaining water and aluminum paste into a uniform paste slurry, add the paste slurry into the slurry, stir quickly for 30s, pour into the mold box, stop and gasify, pre-nurture and solidify at 55℃, demold and cut, enter the kettle for high-temperature autoclaving, and get out of the kettle to get traditional autoclaved aerated concrete products, the technical performance is as shown in Table 1.

[0091] The autoclaved aerated concrete prepared in the examples and comparative examples is produced according to GB / T11968-2020, the mechanical property test method is according to GB / T11969-2008, and the thermal conductivity test method is according to GB / T10294-2008, and the performance test results are as shown in Table 1.

[0092] Table 1 Performance Index

[0093]

[0094] Comparative Example 7 is the autoclaved aerated concrete product prepared without adding phase change energy-saving synergist, the pore size is large,

[0095] The aperture is mostly elliptical, and has more connected holes, as shown in Figures 1-4 Table 2. Aperture structure distribution

[0096] Table 2. Aperture structure distribution

[0097]

[0098] The autoclaved aerated concrete product prepared by adding the basic type phase change energy-saving synergist Example 1, Example 2, the promotion type phase change energy-saving synergist Example 4, and the strengthening type phase change energy-saving synergist Example 6 has small aperture and mostly circular hole shape, and basically no connected hole (as shown in Figures 5-8 Table 3. Aperture distribution

[0099] Table 3. Aperture distribution

[0100]

[0101] The hydration product of the autoclaved aerated concrete product of Comparative Example 7 (a) prepared without adding the phase change energy-saving synergist is SiO2: ~ 37.6%, tobermorite: ~ 8.6%, mullite: ~ 6.8%, 3Al2O3·4SO3·xH2O: ~ 27.5%, calcium aluminate: ~ 6.0%, illite: ~ 5.1%, CaCO3: ~ 8.4% (as shown in Figure 9 ).

[0102] The hydration product of the autoclaved aerated concrete product of Example 4 prepared by adding the phase change energy-saving synergist is SiO2: ~ 39.7%, tobermorite: ~ 3.9%, mullite: ~ 2.3%, CaCO3: ~ 32.6%, 3Al2O3·4SO3·xH2O: ~ 17.0%, calcium aluminate: ~ 4.5% (as shown in Figure 10 ).

[0103] The mixing and pouring temperature of the autoclaved aerated concrete without adding the phase change energy-saving synergist is 45-55°C, and the pre-curing temperature is 50-65°C.

[0104] The mixing and pouring temperature of the autoclaved aerated concrete with adding the phase change energy-saving synergist is 20-25°C, and the pre-curing temperature is 30-40°C, and the self-reaction generated temperature is 37-42°C.

[0105] Table 4. Energy-saving effect influence

[0106]

[0107] From the above, from Table 1, it can be seen that the heat conductivity coefficient, compressive strength and other performance indicators of the autoclaved aerated concrete product doped with the phase change energy-saving synergist are all superior to the national standard. From Table 1, it can be seen that the heat conductivity coefficient is greatly superior to the national standard, proving that the autoclaved aerated concrete doped with the phase change energy-saving synergist has excellent heat preservation and insulation performance. The strength of the autoclaved aerated concrete product prepared in Example 4 meets the requirements of the national standard, the design 1.1 insulation coefficient, the thickness of 290 mm, and the wall heat transfer coefficient is less than 0.3 (W / m 2 ·K), and a single material can meet the standard requirements of building energy saving 83%, increase the use area, meet the design and user requirements. From Table 4, it can be seen that compared with the traditional process, the phase change energy-saving synergist of the present application saves energy, reduces cost, improves production efficiency, and reduces carbon dioxide emissions.

[0108] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements easily thought of by those skilled in the art within the technical range disclosed by the present application should be covered within the protection scope of the present application.

Claims

1. A phase change energy saving enhancer for autoclaved aerated concrete, characterized by: The synergist and the foaming agent aluminum powder or aluminum paste in the autoclaved aerated concrete raw material carry out double hydrolysis reaction, the directly generated gas phase is carbon dioxide phase, the generated solid phase is mainly calcium carbonate phase and silicon dioxide phase, and the proportion in the total solid phase is > 50%; dry density: < 650 kg / m 3 , the proportion of holes with a pore size of < 1 mm is > 50%. The synergist is a basic type phase change energy-saving synergist; the main material of the basic type phase change energy-saving synergist is an inorganic salt material, the auxiliary material includes a regulating material, a foam stabilizing material, a bonding material, the inorganic salt material is bicarbonate, carbonate or a mixture thereof, the regulating material includes one or more of phosphate, metaphosphate, hydroxyl carboxylate, boride, the foam stabilizing material includes one or more of acrylic latex, sodium polyacrylate, polyacrylamide, hydroxypropyl methylcellulose and its salt, carboxymethyl cellulose and its salt, emulsified silicone oil, polyvinyl alcohol, xanthan gum, stearic acid and its salt, paraffin, and the main material of the bonding material includes dextrin, white latex; the coating inorganic salt material in the basic type phase change energy-saving synergist is added in an amount of 0.8-10% of the total weight of autoclaved aerated concrete raw materials, the regulating material is 0.05-1% of the total weight of autoclaved aerated concrete raw materials, wherein the preparation method of the coating inorganic salt material is: water is added to a stirrer, the bonding material is added while stirring, the stirring rate is 700-900 r / min, the stirring time is 10-20 min, and it becomes a sticky colloid, the foam stabilizing material is added and stirred uniformly, the stirring rate is 700-900 r / min, and the stirring time is 7-10 min to obtain a dilute sticky liquid, the inorganic salt material is placed in a boiling coater, and the dilute sticky liquid is added through a spray machine and coated in the boiling coater, and the coating temperature is 50-60℃. The aluminum powder or aluminum paste is 0.05-0.3% of the total weight of autoclaved aerated concrete raw materials. The weight percentage of the inorganic salt material, the bonding material and the foam stabilizing material is (75-85):(14.5-24.5):(0.3-0.5).

2. The autoclaved aerated concrete phase change energy efficiency enhancer according to claim 1, characterized in that: The promotion type phase change energy-saving synergist is composed of the basic type phase change energy-saving synergist and a solid phase change barrier material.

3. The autoclaved aerated concrete phase change energy efficiency enhancer according to claim 1, characterized in that: The strengthening type phase change energy-saving synergist is composed of the promotion type phase change energy-saving synergist and a solid phase change reflective material.

4. The autoclaved aerated concrete phase change energy efficiency enhancer according to claim 1, characterized in that: The auxiliary material further includes one or more of resin, alcohol, acrylate and copolymer emulsion thereof.

5. The autoclaved aerated concrete phase change energy efficiency enhancer according to claim 2, characterized in that: The solid phase change barrier material includes one or more of sericite powder, amorphous silicon dioxide, vermiculite powder, diatomite powder and rubber powder.

6. The autoclaved aerated concrete phase change energy efficiency enhancer according to claim 2, wherein: The solid phase change reflective material includes one or more of titanium dioxide powder, ceramic powder and modified potassium titanate whisker powder.

7. Use of the phase change energy saving enhancer for autoclaved aerated concrete according to any one of claims 1 to 6, characterized in that: It is added to autoclaved aerated concrete for preparing low thermal conductivity autoclaved aerated concrete products.

8. Use of autoclaved aerated concrete phase change energy efficiency enhancer according to claim 7, characterized in that: Thermal conductivity of autoclaved aerated concrete products: B03 class < 0.055 W / m 2 • K, B04 class < 0.067 W / m 2 • K, B05 class < 0.087 W / m 2 • K, B06 class < 0.10 W / m 2 • K.

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