Release agent special for aluminum template for building and preparation method of release agent

Abstract

The invention relates to a special release agent for a building aluminum template and a preparation method of the special release agent, and the special release agent is prepared from the following raw materials in parts by mass: 90-120 parts of an oily substance, 7-15 parts of oleic soap, 1-2 parts of a silane coupling agent (Y-R-Si (OR) 3), 0.8-1.5 parts of polyethylene glycol (C2nH4n + 2On + 1), 3-10 parts of a preservative, 1-2 parts of sodium hydroxide and the balance of water, and the total mass part is 1000 parts. The special release agent for the building aluminum template is synthesized through chemical reaction kinetics design by using few chemical substances such as product diesel engine oil with strictly standardized quality, oleic soap, silane coupling agent (Y-R-Si (OR) 3) polyethylene glycol (C2nH4n + 2On + 1) and the like under the condition of not needing a reaction kettle and high temperature, and the release agent does not corrode a mold, is naturally demoulded, and has the advantages of simple process, low cost and the like. The film forming thickness reaches the micron level, uniformity and environment friendliness are achieved, the film forming time is short, the problems that an existing release agent easily pollutes the surface of an aluminum template and easily corrodes the template can be solved, and the problem that the cost is too high due to the fact that the usage amount of emulsion is too high is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concrete water-reducing agent, in particular to a cross-linking type viscosity-reducing polycarboxylic acid mother liquor and a preparation method thereof. BACKGROUND

[0002] The full aluminum alloy formwork technology originated in the United States in the 1950s, and has been implemented in developed countries such as the United States and Canada. It has gradually been used in the construction field of Asian countries such as Mexico, Brazil, Malaysia, South Korea, Japan and India, and has been widely applied in subsequent development, and is mostly used in high-rise residential building construction.

[0003] With the rapid development of high-rise buildings, the building structure form gradually changes from the brick-concrete structure to the cast-in-place concrete structure which has better integrity, stronger seismic performance, higher fire performance and lower cost. In the cast-in-place concrete engineering construction, the building formwork plays a crucial role: the formwork engineering quantity accounts for 30% to 40% of the main structure engineering quantity, the formwork construction period accounts for about 50% of the total construction period, and the formwork engineering cost accounts for 20% to 30% of the total cost of the concrete engineering. In addition, the selection of formwork materials directly affects the quality and appearance of the concrete structure. At present, the building formwork materials in China mainly include wood formwork (about 70%), steel formwork (about 25%), aluminum formwork (about 2%) and other formwork (such as plastic formwork and bamboo formwork, accounting for about 3%). It is generally believed that a high-quality building formwork should have the characteristics of high quality, low self-weight, high efficiency, low consumption, high turnover rate and low cost. Compared with traditional wood formwork and steel formwork, aluminum formwork has the advantages of high rigidity, size stability, less joint, high construction precision, light weight, high construction efficiency, multiple recycling and low comprehensive cost, and has become a new direction for the promotion of building formwork market. Since 2000, China has gradually introduced aluminum formwork construction technology and gradually applied it in the field of building construction, especially in coastal cities.

[0004] However, with the increasing application of aluminum formwork, its own problems have gradually emerged: the good airtightness of aluminum formwork makes it difficult for the gas in the concrete to be discharged, resulting in more pores on the surface of the concrete after the formwork is removed, which affects the appearance quality; the good heat conduction performance of aluminum formwork may cause the surface temperature to drop too fast during the hardening process of the concrete, causing the concrete surface to be uneven or the color to be uneven after demolding; and the "rotten root" phenomenon caused by the leakage of slurry at the bottom of the formwork during construction, etc. These problems limit the widespread application of aluminum formwork to some extent. Therefore, it is necessary to develop a release agent to solve the above problems so that better demolding effect can be obtained when the aluminum formwork is demolded. SUMMARY

[0005] The present application aims to solve the above problems and provides a special release agent for aluminum formwork for building and a preparation method thereof.

[0006] To solve the above problems, the application provides a special release agent for aluminum mold for building, characterized in that the preparation raw materials include the following components in mass fraction:

[0007] 90-120 parts of oily substance;

[0008] 7-15 parts of oleic acid soap;

[0009] 1-2 parts of silane coupling agent;

[0010] 0.8-1.5 parts of polyethylene glycol;

[0011] 3-10 parts of preservative;

[0012] 1-2 parts of sodium hydroxide;

[0013] the rest is water,

[0014] and the total mass fraction is 1000 parts.

[0015] Further, the oily substance is diesel oil, which is a mixture of one or more of 5W-20, 5W-30, 10W-20, 10W-30, 15W-40 and 20W-50 diesel oil.

[0016] Further, the oily substance is a mixture of 5W-20 and 20W-50 diesel oil in a mass ratio of 3:1.

[0017] Further, the oleic acid soap is sodium oleate, which has a chemical formula of CH3(CH2)7CH=CH(CH2)7COONa, arsenic content of less than 2 mg / kg, heavy metal content of less than 40 mg / kg, and free alkali content of less than 0.5% (mass fraction).

[0018] Further, the silane coupling agent (Y-R-Si(OR)3) is one or more of γ-chloropropyl trimethoxysilane, vinyl triethoxysilane, β-(3,4-epoxycyclohexyl) ethyl trimethoxysilane, N-β-(aminoethyl)-γ-aminopropyl trimethoxysilane and γ-(3,2-epoxypropoxy) methyl trimethoxysilane.

[0019] Further, the polyethylene glycol has a chemical formula of C 2n H 4n+2 O n+1 and a molecular weight of 400-10000.

[0020] Further, in the polyethylene glycol, the weight average molecular weight of the polyethylene glycol used for emulsification is not more than 600, the PH is 5-7, and the weight average molecular weight of the polyethylene glycol used for film formation is not more than 10000.

[0021] Further, the sodium hydroxide is a sodium hydroxide aqueous solution with a mass concentration of 30-40%.

[0022] Further, the preservative is one or several of MIT (methyl isothiazolinone) and CIR (methyl chloroisothiazolinone).

[0023] In addition, the application further provides a preparation method of the special release agent for building aluminum mold, characterized by comprising the following steps:

[0024] The oily substance and the oleic acid soap are added to water in the proportion, and are dissolved at a temperature of 5-30 DEG C, wherein the stirring speed is kept at 2000 r / min during the dissolving process, and the stirring is performed for 10-20 min to obtain solution A;

[0025] The silane coupling agent is stirred at 1500 r / min for 5-10 min, and then the polyethylene glycol is added to obtain solution B;

[0026] The solution A is slowly added to the solution B, and then the preservative is added in the proportion, and the stirring is continuously performed at 1000 r / min for 10-30 min;

[0027] The obtained solution is added with sodium hydroxide aqueous solution, and the PH is adjusted to 5-7 to obtain the special release agent for building aluminum mold.

[0028] The application has the beneficial contribution that the above problems are effectively solved. 2n H 4n+2 O n+1 The application uses a few chemical substances such as engine oil, oleic acid soap, silane coupling agent (Y-R-Si(OR)3) and polyethylene glycol (C 2n H 4n+2 O n+1 ) with strict standardization of mass, and synthesizes a special release agent for building aluminum mold through chemical reaction kinetics design without reaction kettle and high temperature. The release agent does not corrode the mold, and the natural release has a film thickness of micron level, is uniform and environment-friendly, has short film forming time, and solves the problems of existing release agents that are easy to contaminate the surface of the aluminum mold and easy to rust the mold. The use of the release agent of the application makes the surface of the formed component smooth without bubbles, the adhesion amount of the mold concrete is small, and better release quality can be obtained.

[0029] The release agent of the present application can prevent the direct contact and adhesion of concrete and aluminum formwork, reduce the frictional resistance between concrete and formwork, and facilitate the release. After use, a continuous, uniform and firm film can be formed on the surface of the aluminum formwork, which can protect the aluminum formwork from corrosion. In addition, the release agent formula of the present application is stable itself, does not stratify or deteriorate, the formed film is stable under construction conditions, resistant to water washing and cement alkaline erosion, and the release agent itself is environmentally friendly. The release agent of the present application has the characteristics of easy coating and short film forming time, and the use amount of high-cost components is reduced, which can greatly reduce the cost. DETAILED DESCRIPTION

[0030] The following examples are further explanations and supplements of the present application, which do not constitute any limitation to the present application.

[0031] A release agent special for aluminum formwork for building, the preparation raw materials thereof include the following components in mass fraction: oily substance 90-120 parts;

[0032] Oleic acid soap 7-15 parts;

[0033] Silane coupling agent (Y-R-Si(OR)3) 1-2 parts;

[0034] Polyethylene glycol 0.8-1.5 parts

[0035] Preservative 3-10 parts

[0036] Sodium hydroxide 1-2 parts.

[0037] The balance is water.

[0038] The total mass is 1000 parts.

[0039] The oily substance is used as a lubricating base oil, which is used to form an isolation film, reduce the adhesion of concrete and formwork, and significantly reduce the friction coefficient between concrete and aluminum formwork, which is the key physical basis for natural release. The oily substance as a continuous oil phase in the formula is the main substance for forming a physical isolation film, which blocks the direct contact of concrete and moisture with the aluminum formwork, and is the core physical barrier for forming an oil film to prevent concrete adhesion. In the present application, the amount of oily substance is only 9-12% of the total amount, which is significantly reduced, so it can directly bring the following advantages:

[0040] 1. Reduce cost; usually, the oily substance is one of the main costs of the release agent formula, and the amount of the oily substance in the present application is small, so the cost can be reduced.

[0041] 2. Reduce pollution to the formwork: excessive grease is easy to remain and adsorb dust, which can easily pollute the aluminum formwork and the surface of the concrete, therefore, the low amount of oily substance helps to keep the aluminum formwork clean.

[0042] 3. Promote thin film formation: high oil content tends to form thick film, the oil content of the present application is low, and micron-level uniform thin film is achieved by combining emulsification.

[0043] 4. Reduce the risk of potential corrosion: some high acid value or impurity-containing oily substances may be corrosive to metals, and the use of oily substances can reduce this risk.

[0044] In the present application, the oil substance is selected as diesel oil, which is a mixture of one or more of the following types: 5W-20, 5W-30, 10W-20, 10W-3, 15W-40, and 20W-50 diesel oil. The present application uses diesel oil as the main oily carrier, which has high lubricity and film-forming property, which can reduce the adhesion of the mold to the concrete. Moreover, the standardized quality of diesel oil ensures the stability of the release agent performance.

[0045] As a preferred embodiment, the oil substance is a mixture of 5W-20 and 20W-50 diesel oil with a mass ratio of 3:1, wherein the 5W-20 diesel oil is a low-viscosity diesel oil with good permeability, and the 20W-50 diesel oil is a high-viscosity diesel oil with strong film-forming property. The mixture of the two can form a continuous but not too thick oil film on the surface of the aluminum mold plate, which can enhance the strength and durability of the lubricating film while ensuring thinness, thus ensuring the release effect and avoiding the problem of too thick release agent film.

[0046] The oleic acid soap is used to play a dual role, on the one hand, as an anionic surfactant, it helps to emulsify the oil substance (such as diesel oil), its hydrophilic end and lipophilic end can emulsify and disperse the oil substance (diesel oil) into water to form a stable oil-in-water (O / W) emulsion. On the other hand, it can reduce the surface tension, and its carboxyl group can form chemical adsorption with the surface of the aluminum mold plate, improve the wetting and spreading ability of the emulsion on the surface of the aluminum mold plate, make the coating more uniform, and be conducive to the formation of a continuous film.

[0047] Further, the oleic acid soap is selected as sodium oleate, whose chemical formula is CH3(CH2)7CH=CH(CH2)7COONa, and its double bond (CH=CH) can provide certain reactivity and main emulsification effect.

[0048] Further, the quality requirements of the sodium oleate need to be: arsenic content of 2 mg / kg or less, heavy metals of 40 mg / kg or less, free alkali of 0.5% (mass fraction) or less. Among them, the arsenic content of 2 mg / kg or less can avoid the influence of heavy metal toxicity on the environmental protection of the release agent; the heavy metal of 40 mg / kg or less can prevent corrosion to the aluminum mold plate, and the free alkali of 0.5% or less can prevent the destruction of the aluminum mold plate surface oxide layer caused by too high free alkali. Because too high heavy metal and free alkali can accelerate the corrosion of aluminum, especially controlling the content of free alkali can greatly avoid the corrosion of the aluminum mold plate. In addition, the more impurities, the more it affects the emulsification stability.

[0049] The oleic acid soap is the core of realizing the water-based formula (environmental protection) and the uniform dispersion of the oil phase (uniform film formation, micron level), and the quality requirements guarantee "non-corrosion of the mold" and "environmental protection". Good wettability promotes "uniform" film formation.

[0050] The silane coupling agent is used as a reinforcing agent and a bonding promoter, and its functions are as follows:

[0051] Enhance the adhesion of the film layer: the formed oil film is anchored on the surface of the aluminum mold plate through chemical bonding, significantly improves the firmness and durability of the film, resists mechanical peeling and water washing during demolding, and makes the mold concrete adhesion amount less;

[0052] Improve the concrete interface: reduce the interfacial tension between the concrete and the film layer or form a weak boundary layer, further reduce the bonding force, achieve natural demolding, smooth surface and bubble-free demolding effect, and obtain good demolding quality;

[0053] Hydrophobicity: the formed siloxane structure itself has hydrophobicity, which enhances the waterproof isolation effect of the overall film.

[0054] Further, the silane coupling agent Y-R-Si(OR)3, after hydrolysis, generates silanol (Si-OH), which can form a firm Si-O-Al covalent bond with the hydroxyl group (Al-OH) or aluminum oxide on the surface of the aluminum mold plate to enhance the adhesion of the film layer.

[0055] As a priority, the silane coupling agent (Y-R-Si(OR)3) is one or several of γ-chloropropyltrimethoxysilane, vinyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, and γ-(3,2-epoxypropoxy)methyltrimethoxysilane. The most preferred is β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane.

[0056] In this application, the silane coupling agent is used as a functional additive, and its amount is small, but the effect is significant.

[0057] The polyethylene glycol (PEG) is used as an auxiliary emulsifier and a film forming regulator, which can help achieve uniform film formation, short film formation time, and synergistically enhance emulsion stability.

[0058] Further, the chemical formula of the polyethylene glycol is abbreviated as C 2n H 4n+2 O n+1 .

[0059] As preferred, the polyethylene glycol (C 2n H 4n+2 O n+1 ) has a molecular weight of 400-10000;

[0060] Among them, the polyethylene glycol for emulsification has a weight average molecular weight of not more than 600, a PH of 5-7, and preferably 400, which has good water solubility and certain surface activity, can effectively reduce the oil-water interfacial tension, assist the stability of the oleic acid soap emulsion, and especially improve the low-temperature solubility and dispersibility. In addition, the PH of 5-7 can reduce the corrosion risk of free alkali to the aluminum template and ensure the stability and function of the polyethylene glycol.

[0061] Further, the polyethylene glycol for film formation has a weight average molecular weight of not more than 10000, preferably 6000, which can increase the continuity and flexibility of the film, and its viscosity can effectively fill the micropores of the aluminum template, which is beneficial to the formation of a continuous and dense film layer, making the film more uniform and dense, and reducing the penetration and adhesion of concrete. In addition, it can also avoid the embrittlement of the film layer in low-temperature environment, adapt to construction environment of-10℃ to 50℃, and improve the application range. In addition, it can also synergize with the emulsifier to improve the wetting and spreading.

[0062] Further, the polyethylene glycol for emulsification and the polyethylene glycol for film formation are mixed in a certain mass ratio (such as 2:1), which can reduce the overall viscosity by using low molecular weight components, and at the same time, use high molecular weight components to enhance the mechanical strength of the film layer. Through the gradient design of molecular weight, the balance between emulsification efficiency and film formation can be achieved, which provides a basis for the high efficiency and low cost of the building aluminum mold release agent.

[0063] The preservative is used as a biological stabilizer, because water-based formulations are prone to breed bacteria, mold and other microorganisms, leading to product spoilage, deterioration, odor, and failure. The preservative can effectively kill or inhibit the growth of microorganisms, prolong the storage and service life of the product. Therefore, the addition of the preservative in the formula can ensure the stable performance of the release agent: no delamination, no deterioration, and no failure.

[0064] Further, the preservative is one or more of MIT (methyl isothiazolinone) and CIR (methyl chloroisothiazolinone). The preferred embodiment is MIT.

[0065] The sodium hydroxide is used to adjust the pH value to control the pH value between 5-7, because, over alkali will accelerate the corrosion of aluminum template, over acid will affect the activity of silane coupling agent. In addition, by adjusting the pH value between 5-7, the stability of the oleic acid soap can be ensured: the soap is more stable under alkaline conditions, and the pH value is too low, which may lead to hydrolysis of the oleic acid soap into free acid, destroying the emulsion system. In addition, the hydrolysis and condensation rate of silane is affected by pH, pH 5-7 can promote the necessary hydrolysis (Si-OH is formed and combined with aluminum), and avoid excessive condensation to produce gel. Therefore, sodium hydroxide can maintain the chemical stability of the whole formula system and the optimal activity state of the functional components (especially silane and oleic acid soap), which is the key control parameter to realize the comprehensive performance of the release agent, such as non-corrosion of the mold, stable film formation, natural demolding and the like.

[0066] Further, the sodium hydroxide is a sodium hydroxide aqueous solution with a mass concentration of 30-40%, and low concentration facilitates accurate addition and pH control.

[0067] The remaining water in the formula is the basis for realizing the water-based environmentally friendly formula, and is used as a dispersion medium, which has the highest amount, and is used to carry oil phase droplets and other water-soluble / dispersible components, which can significantly reduce material cost. In addition, replacing organic solvents with water can make the product have very low or no VOC content, achieving environmental protection. Moreover, the release agent can be easily sprayed, brushed or rolled, and after coating, the water evaporates, and the oil phase and functional components are enriched on the template surface to form a film layer.

[0068] In summary, in the formula of the present application, a small amount of oily material, oleic acid soap and a large amount of water constitute the core of the oil-in-water (O / W) emulsion system, providing basic lubrication and isolation function, while realizing environmental protection, cost control, easy construction and easy formation of thin (micron level) film. The silane coupling agent firmly anchors the oil film on the aluminum template through strong chemical bonding (Si-O-Al), solves the adhesion problem, protects the aluminum template from corrosion, and significantly reduces the adhesion of concrete, overcoming the existing problems of aluminum template demolding. Polyethylene glycol helps to optimize the stability of the emulsion and the structure of the film layer, and fine-tunes the film formation process, so that the film formation time is short. The preservative ensures the biological stability of the release agent during storage and use. The sodium hydroxide accurately controls the pH value, ensuring the chemical stability of the system and the optimal activity of the key components (soap and silane).

[0069] In addition, the present application also provides a preparation method of a special release agent for aluminum mold for building, which comprises the following steps:

[0070] The oily material and the oleic acid soap in the above-mentioned proportions are added to water, and dissolved at a temperature of 5-30°C, and the stirring speed is kept at 2000r / min during dissolution, and stirring for 10-20min to obtain solution A;

[0071] The proportion of silane coupling agent is stirred at 1500 r / min for 5-10 min, and then polyethylene glycol is added to obtain solution B;

[0072] The solution A is slowly added to the solution B, and then the preservative is added in the proportion, and stirring is continued at 1000 r / min for 10-30 min.

[0073] The obtained solution is added with sodium hydroxide aqueous solution to adjust the pH to 5-7, thereby obtaining the building aluminum mold special release agent.

[0074] Further, the method of the present application only comprises the above steps.

[0075] The method of the present application embodies the chemical reaction kinetics design. In the above steps, heating is not required, and low-temperature operation can simplify the process, reduce energy consumption and safety risk; and the step-by-step mixing (mixing of oily substance + oleic acid soap + water, then mixing of silane coupling agent + polyethylene glycol, and finally mixing and adjusting pH) can control the reaction order and rate, avoid premature hydrolysis and condensation of silane, and optimize the emulsification effect and function of silane, thereby realizing the preparation of high-performance products under simple conditions.

[0076] The present application can ensure the same release effect, and due to the use of less oily substance, the release agent does not corrode the mold, the natural release is achieved, the film thickness reaches the micron level, the film is uniform and environmentally friendly, the film forming time is short, the problems of easy pollution of the surface of the aluminum mold plate and easy rusting of the mold of the existing release agent are solved, the cost is reduced due to the overuse of the emulsion, the surface of the formed component is smooth and free of bubbles, and the adhesion amount of the mold concrete is small, so that the present application is a good quality concrete release agent. It can be widely used in aluminum formwork construction.

[0077] The following further provides several specific formulations of release agents:

[0078] Example 1

[0079] The building aluminum mold special release agent of the present embodiment is prepared from the following components in the following mass fractions:

[0080] 90 parts of oily substance;

[0081] 7 parts of oleic acid soap;

[0082] 1 part of silane coupling agent (Y-R-Si(OR)3);

[0083] 0.8 parts of polyethylene glycol;

[0084] 3 parts of preservative;

[0085] 1 part of sodium hydroxide;

[0086] Water makes up the balance to 1000 parts.

[0087] Example 2

[0088] The building aluminum mold special release agent of this example, its preparation raw material includes the following mass fraction components:

[0089] Oily substance 120 parts;

[0090] Oleic acid soap 15 parts;

[0091] Silane coupling agent (Y-R-Si (OR) 3) 2 parts;

[0092] Polyethylene glycol 1.5 parts

[0093] Preservative 10 parts

[0094] Sodium hydroxide 2 parts.

[0095] Water makes up the balance to 1000 parts.

[0096] Example 3

[0097] The building aluminum mold special release agent of this example, its preparation raw material includes the following mass fraction components:

[0098] Oily substance 100 parts;

[0099] Oleic acid soap 12 parts;

[0100] Silane coupling agent (Y-R-Si (OR) 3) 1.5 parts;

[0101] Polyethylene glycol 1.2 parts

[0102] Preservative 6 parts

[0103] Sodium hydroxide 1.5 parts.

[0104] Water makes up the balance to 1000 parts.

[0105] Example 4

[0106] The building aluminum mold special release agent of this example, its preparation raw material includes the following mass fraction components:

[0107] Oily substance 110 parts;

[0108] Oleic acid soap 8 parts;

[0109] Silane coupling agent (Y-R-Si (OR) 3) 2 parts;

[0110] Polyethylene glycol 0.82 parts

[0111] Preservative 5 parts

[0112] Sodium hydroxide 1 part.

[0113] The balance is water, the total amount being 1000 parts.

[0114] Although the present application has been described with reference to the above embodiments, the scope of the present application is not limited thereto, and the above components can be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the present application.

Claims

1. A special release agent for aluminum molds for construction, characterized in that: The raw materials for its preparation include the following components in parts by mass: 90-120 parts of oily substances; 7-15 parts of oleic acid soap; 1-2 parts of silane coupling agent; 0.8-1.5 parts of polyethylene glycol; 3-10 parts of preservatives; 1-2 parts of sodium hydroxide; The balance is water, The total mass parts is 1000 parts.

2. The release agent for aluminum molds for construction according to claim 1, characterized in that: The oily substance is diesel engine oil, which is a mixture of one or more of 5W-20, 5W-30, 10W-20, 10W-3, 15W-40, and 20W-50 diesel engine oils.

3. The release agent for aluminum molds for construction according to claim 1, characterized in that: The oily substance is a mixture of 5W-20 and 20W-50 diesel engine oils in a mass ratio of 3:

1.

4. The release agent for aluminum molds for construction according to claim 1, characterized in that: The oleic acid soap is sodium oleate, the chemical formula of which is CH3(CH2)7CH=CH(CH2)7COONa, and contains arsenic below 2 mg / kg, heavy metal below 40 mg / kg, and free alkali below 0.5% (mass fraction).

5. The release agent for aluminum molds for construction according to claim 1, wherein: The silane coupling agent (YR-Si(OR)3) is one or more of γ-chloropropyltrimethoxysilane, vinyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, and γ-(3,2-epoxypropyloxy)methyltrimethoxysilane.

6. The release agent for aluminum molds for construction according to claim 1, wherein: The chemical formula of the polyethylene glycol is C 2n H 4n+2 O n+1 , molecular weight is 400-10000.

7. The special release agent for aluminum mold for construction according to claim 1, characterized in that Among the polyethylene glycols, the weight average molecular weight of the polyethylene glycol used for emulsification does not exceed 600, the pH is 5-7, and the weight average molecular weight of the polyethylene glycol used for film formation does not exceed 10,000.

8. The release agent for aluminum mold for construction according to claim 1, wherein The sodium hydroxide is a sodium hydroxide aqueous solution with a mass concentration of 30-40%.

9. The release agent for aluminum mold for construction according to claim 1, wherein The preservative is one or more of MIT (methylisothiazolinone) and CIR (methylchloroisothiazolinone).

10. A method for preparing a release agent for building aluminum molds according to any one of claims 1 to 9, characterized in that: It includes the following steps: Add the oily substance and oleic acid soap in the above proportion to water, dissolve them at a temperature of 5°C-30°C, maintain a stirring speed of 2000 r / min during dissolution, and stir for 10-20 minutes to obtain solution A; Stir the silane coupling agent in the above proportion at 1500 r / min for 5 to 10 minutes, then add polyethylene glycol to obtain solution B; Slowly add the above solution A to solution B, then continue to add the preservatives in the above proportions, and continue stirring at 1000 r / min for 10 to 30 minutes; The obtained solution is added with a sodium hydroxide aqueous solution and the pH is adjusted to 5-7 to obtain the special release agent for aluminum molds for construction.