Environment-friendly water-soluble release agent as well as preparation method and application thereof

Abstract

The invention relates to the field of release agents, in particular to an environment-friendly water-soluble release agent and a preparation method and application thereof. The environment-friendly water-soluble release agent is characterized by being prepared from the following raw materials in parts by mass: 1 to 40 parts of water-soluble resin, 3 to 10 parts of a block copolymer, 1 to 25 parts of a thickening agent, 0.5 to 15 parts of a stabilizer, 0 to 50 parts of an anti-icing agent, 0.001 to 5 parts of an anti-corrosion and anti-rust agent, 0.001 to 0.1 part of a de-foaming agent and 40 to 95 parts of a de-foaming agent, wherein the block copolymer is prepared from the following raw materials: linseed oil, isocyanate acrylic acid amide and cardanol glycidyl ether. The environment-friendly water-soluble release agent provided by the invention has the advantages that the release resistance is obviously reduced, the smooth proceeding of the release process is ensured, the smoothness and flatness of the concrete surface are improved, and the generation of surface defects such as voids and pitted surfaces is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of release agents, in particular, to an environmentally friendly water-soluble release agent and its preparation method and application. BACKGROUND

[0002] Concrete release agent is a lubricating and isolating material coated on the inner wall of the formwork, aiming to achieve the smooth separation of concrete and formwork and maintain the integrity of the component surface. However, the traditional release agent has significant defects: environmental pollution problem: currently widely used oil, waste oil, emulsified oil and other oily substances as release agent, which is easy to cause pollution of the concrete surface, and causes resource waste and ecological harm; performance limitation: oily or emulsified oil release agent needs to clean the formwork and brush the release agent before each pouring, which is easy to leave oil film affecting the apparent quality of the concrete surface; emulsified oil type release agent is easy to penetrate into the concrete surface of the contact surface between concrete and mold, resulting in reduced strength of the concrete surface, and easy to produce pitted surface; cost and efficiency problem: the use cost of oil type release agent is high, in order to reduce the cost, people put forward the water-based emulsified oil release agent, although it can reduce the amount and reduce the use cost, but reduces the release efficiency; at the same time, the emulsified oil type release agent is a non-stable system, which puts forward strict requirements for water quality, and the water quality is easy to break emulsion and stratify, which seriously affects the performance.

[0003] Domestic researchers have done some fruitful work on water-soluble concrete release agents, such as the water-soluble release agent disclosed in patent CN117600396A, which is made of water-soluble silicone oil and surfactant, and has certain release effect, but does not involve biodegradation and environmental protection, and the surfactant can penetrate into the concrete surface, affecting the surface quality. The concrete release agent disclosed in patent CN115418260A is composed of animal and vegetable oil or silicone oil, emulsifier and other additives, and has certain release effect, but the emulsifier can penetrate into the surface and affect the surface quality of the concrete. The water-based concrete release agent disclosed in patent CN112500911A is also compounded by oil, film-forming material, emulsifier and other additives, but the process is relatively complex, the mold is inconvenient to handle later, and it also does not have environmental protection performance. The environmentally friendly water-soluble release agent disclosed in patent CN109593595A is also made of silicone oil and emulsifier. The water-soluble release agent disclosed in patent CN106827325A is made of rapeseed oil, which is relatively environmentally friendly, but the production process of the release agent is complex, and rapeseed oil is a food resource. The water-soluble release agent disclosed in patent CN106042231A is made of jatropha oil and emulsifier, and the production process of the release agent is more complex, the emulsifier has poor natural decomposition, and the jatropha oil has limited production capacity and cannot be widely applied. The release agent disclosed in patent CN104552686A is made of silicone oil, emulsifier and nano magnetic material, the magnetic material increases the adhesion of the release agent to the mold, improves the release effect, but also has environmental problems. The water-soluble release agent disclosed in patent CN1165060A is made of emulsifier and fat, which is also an emulsified oil-based release agent, and also has environmental problems.

[0004] To solve the above problems and deficiencies, we have invented an environmentally friendly organic water-soluble release agent, which does not use oily materials at all and produces a concrete release agent entirely using water-based materials, which can meet the needs of various types of concrete release. SUMMARY

[0005] Therefore, the present application is devoted to providing an environmentally friendly water-soluble release agent and a preparation method and application thereof to solve the problems in the prior art.

[0006] To solve the above technical problems, the present application is implemented as follows:

[0007] The present application provides an environmentally friendly water-soluble release agent, which comprises the following raw materials in mass fraction:

[0008]

[0009] The preparation raw materials of the block copolymer include linseed oil, isocyanate acrylamide and cardanol glycidyl ether.

[0010] In the aforementioned environmentally friendly water-soluble release agent, the water-soluble resin serves as the film-forming matrix, providing a continuous rigid framework to ensure uniform film coverage of the mold surface and prevent concrete penetration. The block copolymer, through hydrophobic segments (cashew phenol glycidyl ether) and a dynamic cross-linking network (linseed oil double bonds), fills the pores of the resin framework, forming a dense and flexible release film. The benzene ring structure of cashew phenol in the block copolymer interacts with the van der Waals forces on the mold surface, oriented to form a low surface energy layer. The benzene ring structure of cashew phenol interacts with the van der Waals forces on the mold surface to form a stable lubricating layer. The hydrophilic segments of the block copolymer (such as acrylic amide) form hydrogen bonds with the water-soluble resin, enhancing the interphase bonding force.

[0011] Preferably, in the above-mentioned environmentally friendly water-soluble release agent, the preparation of the block copolymer includes the following steps:

[0012] S10, linseed oil, isocyanate acrylamide, catalyst and solvent are mixed and reacted to obtain a prepolymer.

[0013] In the above steps, the hydroxyl groups (derived from the glycerol ester structure) in flaxseed oil react with the -NCO groups of the isocyanate acrylamide to generate a polyurethane prepolymer with -NCO end groups, while simultaneously introducing allyl (C=C) functional groups onto the flaxseed oil backbone. This retains the flexibility and hydrophobicity of the oily segments, facilitating the wetting and spreading of the mold release agent on the template, and also achieving functional modification of the flaxseed oil, endowing it with further reactivity.

[0014] S20. The prepolymer, cashew phenol glycidyl ether, catalyst and solvent are mixed and reacted to obtain the intermediate.

[0015] The hydroxyl groups in the intermediate further undergo a ring-opening reaction with the epoxy groups in the cashew phenol glycidyl ether (CGE) molecule, introducing a phenolic ether structure and a rigid benzene ring structure to form a three-dimensional cross-linked network, which improves the steric stability and mechanical strength of the molecule. On the other hand, the introduction of benzene ring and phenolic hydroxyl groups significantly enhances the polarity of the system, thereby improving its dispersibility and stability in the aqueous phase.

[0016] S30. Mix the intermediate, chain transfer agent and solvent, and react to obtain a block copolymer.

[0017] In this step, an intermediate containing double bonds serves as a macromolecular initiator, along with a chain transfer agent (such as DMPA) and polymerizable monomers, to undergo controlled free radical polymerization (RAFT). This process allows for the control of the hydrophilic / hydrophobic segment ratio and molecular chain length, thereby forming a block copolymer structure. The resulting block polymer can self-assemble in the aqueous phase to form nanoscale micelle structures. The hydrophobic segments preferentially adsorb onto the template surface, while the hydrophilic segments extend outwards, forming an isolation layer while simultaneously improving the system's aqueous dispersibility and storage stability.

[0018] Preferably, in the above-mentioned environmentally friendly water-soluble release agent, the molar ratio of the linseed oil to the isocyanate acrylate amide in step S10 is 1:1.05-1:1.2.

[0019] In step S10, the mass ratio of the linseed oil to the catalyst is 100:0.5-100:2.

[0020] In step S10, the mass-volume ratio of the linseed oil to the solvent is 1 g:5 mL-1 g:10 mL.

[0021] In step S10, the catalyst comprises dibutyltin dilaurate and / or stannous octoate.

[0022] In step S10, the solvent comprises at least one of acetone, tetrahydrofuran, and N,N-dimethylformamide.

[0023] Preferably, in the above-mentioned environmentally friendly water-soluble release agent, the temperature of the reaction in step S10 is 60-80°C, and the time of the reaction is 2-4 h.

[0024] Preferably, in the above-mentioned environmentally friendly water-soluble release agent, the molar ratio of the prepolymer to the cardanol glycidyl ether in step S20 is 1:0.8-1:1.5.

[0025] In step S20, the mass ratio of the prepolymer to the catalyst is 100:1-100:3.

[0026] In step S20, the mass-volume ratio of the prepolymer to the solvent is 1 g:5 mL-1 g:10 mL.

[0027] In step S20, the catalyst comprises triethylamine and / or tetrabutylammonium bromide.

[0028] In step S20, the solvent comprises at least one of toluene, xylene, and N,N-dimethylformamide.

[0029] In step S20, the temperature of the reaction is 40-60°C, and the time of the reaction is 4-6 h.

[0030] Preferably, in the above-mentioned environmentally friendly water-soluble release agent, the mass ratio of the intermediate to the chain transfer agent in step S30 is 1:0.05-1:0.1.

[0031] In step S30, the mass-volume ratio of the intermediate to the solvent is 1 g:5 mL-1 g:10 mL.

[0032] The chain transfer agent in step S30 includes cyanomethyl isopropyl dithiobenzoate and / or benzyl dithiobenzoate.

[0033] The solvent in step S30 includes at least one of tetrahydrofuran, ethyl acetate and toluene.

[0034] Preferably, in the above-mentioned environmentally friendly water-soluble release agent, the temperature of the reaction in step S30 is 70-90℃, and the reaction time is 6-8h.

[0035] Preferably, in the above-mentioned environmentally friendly water-soluble release agent, the water-soluble resin includes at least one of silicone-modified acrylic resin, water-soluble polyurethane resin, water-soluble epoxy resin, water-soluble phenolic resin, water-soluble polyester resin and water-soluble alkyd resin.

[0036] The thickening agent includes at least one of carrageenan, gellan gum, xanthan gum, agar, gelatin, sodium alginate, sesbania gum, guar gum, glucomannan, dextran gum and sodium carboxymethyl cellulose.

[0037] The stabilizer includes at least one of disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, sorbitol, maltitol, triethanolamine, diethanolamine and monoethanolamine.

[0038] The corrosion and rust inhibitor includes at least one of phosphate, sodium dehydroacetate, silane coupling agent, sodium benzoate and potassium sorbate.

[0039] The defoaming agent includes at least one of water-based silicone defoaming agent, acetylenic diol defoaming agent, polyether defoaming agent, modified siloxane defoaming agent and fluorine-containing modified defoaming agent.

[0040] The anti-freezing agent includes alcohol.

[0041] The present application also provides a preparation method of the environmentally friendly water-soluble release agent, including the following steps:

[0042] The water-soluble resin, block copolymer, thickening agent, stabilizer, anti-freezing agent, corrosion and rust inhibitor, defoaming agent and water are mixed to obtain the environmentally friendly water-soluble release agent.

[0043] The present application also provides application of the environmentally friendly water-soluble release agent in building concrete.

[0044] Through the above technical solution, the present application has the following beneficial technical effects:

[0045] (1) The block copolymer in the present release agent has good film-forming property and flexibility, can form a dense and uniform film on the surface of the mold, effectively prevent the adhesion between the concrete and the mold after pouring the concrete, thereby significantly reduce the release resistance, ensure the smooth release process, and improve the smoothness and flatness of the concrete surface, and reduce the generation of surface defects such as honeycomb and pitted surface. The selected water-soluble resin and various additives are all water-soluble or low-toxicity or non-toxic raw materials, do not contain mineral oil and organic solvent, avoid the release of VOCs, are friendly to construction personnel, and meet the requirements of green building and environmentally friendly construction.

[0046] (2) The block copolymer is prepared from three monomers of linseed oil, isocyanate acrylamide and cardanol glycidyl ether through pre-polymerization, epoxy ring-opening chain extension and RAFT polymerization, and has obvious structure and function characteristics. Among them, linseed oil provides hydrophobic flexible chain segment to improve the film-forming flexibility; isocyanate acrylamide provides cross-linkable structure and polar segment to enhance the compatibility with water-soluble system; cardanol glycidyl ether introduces phenolic ring structure, which helps to enhance the intermolecular force and improve the alkali resistance; RAFT polymerization realizes the control of molecular weight and structure regularity, and improves the film-forming stability and storage stability. Linseed oil and cardanol are derived from renewable resources, which are low in price and sustainable. The entire synthesis system uses conventional reaction process and mild reaction conditions, which is suitable for large-scale production and helps the green transformation and market promotion of the release agent product.

[0047] (3) The introduction of thickening agent makes the product have good adhesion and construction property; the stabilizer and defoaming agent cooperatively regulate the stability and foam control of the emulsion system, prolong the storage period and improve the spraying and leveling property; the selection of anticorrosive and antirust agent effectively prevents the rust of metal parts of the mold and inhibits the growth of microorganisms in the system; the anti-icing agent ensures that the product does not separate water and freeze at low temperature, and is suitable for construction in winter or cold regions. DETAILED DESCRIPTION

[0048] The present application is further illustrated in detail by the following examples. The raw materials used in the examples can be obtained by commercial channels.

[0049] Example 1

[0050] The environmentally friendly water-soluble release agent comprises the following raw materials in mass fraction:

[0051] The water-soluble resin is water-soluble polyurethane resin 15 parts, the block copolymer is 5 parts, the thickening agent is xanthan gum 8 parts, the stabilizer is disodium ethylenediaminetetraacetate 3 parts, the anti-icing agent is ethylene glycol 20 parts, the anticorrosive and antirust agent is silane coupling agent KH-550 0.5 parts, the defoaming agent is polyether defoaming agent 0.02 parts, and the water is 50 parts;

[0052] The preparation of the block copolymer comprises the following steps:

[0053] (1) Linseed oil, isocyanate acrylamide, catalyst dibutyltin dilaurate and solvent tetrahydrofuran are mixed, and a prepolymer is obtained by reacting at 70℃ for 3h; the molar ratio of linseed oil to isocyanate acrylamide is 1:1.1; the mass ratio of linseed oil to catalyst is 100:1; the mass-volume ratio of linseed oil to solvent is 1g:10mL;

[0054] (2) The prepolymer, cardanol glycidyl ether, catalyst triethylamine and solvent toluene are mixed, and an intermediate is obtained by reacting at 50℃ for 5h; the molar ratio of the prepolymer to cardanol glycidyl ether is 1:1.2; the mass ratio of the prepolymer to catalyst is 100:2; the mass-volume ratio of the prepolymer to solvent is 1g:10mL;

[0055] (3) The intermediate, chain transfer agent cyanisopropyl dithiobenzoate and solvent ethyl acetate are mixed, and a block copolymer is obtained by reacting at 80℃ for 7h; the mass ratio of the intermediate to chain transfer agent is 1:0.08; the mass-volume ratio of the intermediate to solvent is 1g:10mL.

[0056] The preparation method of the environmentally friendly water-soluble release agent comprises the following steps:

[0057] The water-soluble release agent is prepared by mixing the water-soluble resin, the block copolymer, the thickening agent, the stabilizer, the anti-icing agent, the anti-corrosion and anti-rust agent, the defoaming agent and water.

[0058] Example 2

[0059] The environmentally friendly water-soluble release agent comprises the following raw materials in mass fractions:

[0060] The water-soluble release agent is prepared by mixing the water-soluble resin, the block copolymer, the thickening agent, the stabilizer, the anti-icing agent, the anti-corrosion and anti-rust agent, the defoaming agent and water.

[0061] The preparation of the block copolymer comprises the following steps:

[0062] (1) Linseed oil, isocyanate acrylamide, catalyst dibutyltin dilaurate and solvent tetrahydrofuran are mixed, and a prepolymer is obtained by reacting at 70℃ for 3h; the molar ratio of linseed oil to isocyanate acrylamide is 1:1.1; the mass ratio of linseed oil to catalyst is 100:1; the mass-volume ratio of linseed oil to solvent is 1g:10mL;

[0063] (2) mixing the prepolymer, cardanol glycidyl ether, catalyst triethylamine and solvent toluene, and reacting at 45℃ for 5h to obtain an intermediate; the molar ratio of the prepolymer and cardanol glycidyl ether is 1:1; the mass ratio of the prepolymer and catalyst is 100:2.5; the mass-volume ratio of the prepolymer and solvent is 1g:10mL;

[0064] (3) mixing the intermediate, chain transfer agent cyanisopropyl dithiobenzoate and solvent ethyl acetate, and reacting at 85℃ for 7h; the mass ratio of the intermediate and chain transfer agent is 1:0.06; the mass-volume ratio of the intermediate and solvent is 1g:5mL-1g:10mL, to obtain a block copolymer.

[0065] The preparation method of the environmentally friendly water-soluble release agent comprises the following steps:

[0066] Mixing the water-soluble resin, block copolymer, thickening agent, stabilizer, anti-icing agent, anticorrosive and antirust agent, defoaming agent and water to obtain the environmentally friendly water-soluble release agent.

[0067] Example 3

[0068] The environmentally friendly water-soluble release agent differs from Example 1 in that:

[0069] The environmentally friendly water-soluble release agent comprises the following raw materials in mass fractions:

[0070] The water-soluble resin is water-soluble polyester resin 10 parts, the block copolymer is 3 parts, the thickening agent is sodium carboxymethyl cellulose 15 parts, the stabilizer is triethanolamine 5 parts, the anti-icing agent is ethylene glycol 40 parts, the anticorrosive and antirust agent is sodium tripolyphosphate 0.3 parts, the defoaming agent is polyether defoaming agent 0.01 parts, and the water is 75 parts.

[0071] The rest is the same as Example 1.

[0072] Example 4

[0073] The environmentally friendly water-soluble release agent differs from Example 1 in that:

[0074] The environmentally friendly water-soluble release agent comprises the following raw materials in mass fractions:

[0075] The water-soluble resin is water-soluble alkyd resin 25 parts, the block copolymer is 10 parts, the thickening agent is sodium carboxymethyl cellulose 20 parts, the stabilizer is triethanolamine 8 parts, the anti-icing agent is ethylene glycol 30 parts, the anticorrosive and antirust agent is sodium tripolyphosphate 1.5 parts, the defoaming agent is polyether defoaming agent 0.08 parts, and the water is 35 parts.

[0076] The rest is the same as Example 1.

[0077] Comparative Example 1

[0078] An environmentally friendly water-soluble release agent, which differs from Example 1 in that:

[0079] The block copolymer is not present in the environmentally friendly water-soluble release agent.

[0080] The rest are the same as Example 1.

[0081] Comparative Example 2

[0082] An environmentally friendly water-soluble release agent, which differs from Example 1 in that:

[0083] Preparation of the block copolymer, comprising the following steps:

[0084] (1) Linseed oil, isocyanate acrylamide, catalyst dibutyltin dilaurate and solvent tetrahydrofuran are mixed and reacted at 70°C for 3h to obtain a prepolymer; the molar ratio of linseed oil to isocyanate acrylamide is 1:1.1; the mass ratio of linseed oil to catalyst is 100:1; the mass-volume ratio of linseed oil to solvent is 1g:10mL;

[0085] (2) The prepolymer, cardanol glycidyl ether, catalyst triethylamine and solvent toluene are mixed and reacted at 50°C for 5h to obtain an intermediate; the molar ratio of the prepolymer to cardanol glycidyl ether is 1:1.2; the mass ratio of the prepolymer to the catalyst is 100:2; the mass-volume ratio of the prepolymer to the solvent is 1g:10mL.

[0086] The rest are the same as Example 1.

[0087] Comparative Example 3

[0088] An environmentally friendly water-soluble release agent, which differs from Example 1 in that:

[0089] Preparation of the block copolymer, comprising the following steps:

[0090] (1) Linseed oil, isocyanate acrylamide, catalyst dibutyltin dilaurate and solvent tetrahydrofuran are mixed and reacted at 70°C for 3h to obtain a prepolymer; the molar ratio of linseed oil to isocyanate acrylamide is 1:1.1; the mass ratio of linseed oil to catalyst is 100:1; the mass-volume ratio of linseed oil to solvent is 1g:10mL;

[0091] (3) The prepolymer, chain transfer agent cyanisopropyl dithiobenzoate and solvent ethyl acetate are mixed and reacted at 80°C for 7h; the mass ratio of the prepolymer to the chain transfer agent is 1:0.08; the mass-volume ratio of the prepolymer to the solvent is 1g:10mL, to obtain a block copolymer.

[0092] The rest are the same as Example 1.

[0093] Comparative Example 4

[0094] The environmentally friendly water-soluble release agent is different from that of Example 1 in that:

[0095] Preparation of the block copolymer, including the following steps:

[0096] (1) Mix linseed oil, cardanol glycidyl ether, catalyst triethylamine and solvent toluene, and react at 50°C for 5h to obtain an intermediate; the molar ratio of linseed oil to cardanol glycidyl ether is 1:1.2; the mass ratio of linseed oil to catalyst is 100:2; and the mass-volume ratio of linseed oil to solvent is 1g:10mL;

[0097] (2) Mix the intermediate, chain transfer agent cyanisopropyl dithiobenzoate and solvent ethyl acetate, and react at 80°C for 7h; the mass ratio of the intermediate to the chain transfer agent is 1:0.08; and the mass-volume ratio of the intermediate to the solvent is 1g:10mL, to obtain the block copolymer.

[0098] The rest are the same as those in Example 1.

[0099] Comparative Example 5

[0100] The environmentally friendly water-soluble release agent is different from that of Example 1 in that:

[0101] Preparation of the block copolymer, including the following steps:

[0102] (1) Mix isocyanate acrylamide, cardanol glycidyl ether, catalyst triethylamine and solvent toluene, and react at 50°C for 5h to obtain an intermediate; the molar ratio of isocyanate acrylamide to cardanol glycidyl ether is 1:1.2; the mass ratio of isocyanate acrylamide to catalyst is 100:2; and the mass-volume ratio of isocyanate acrylamide to solvent is 1g:10mL;

[0103] (2) Mix the intermediate, chain transfer agent cyanisopropyl dithiobenzoate and solvent ethyl acetate, and react at 80°C for 7h; the mass ratio of the intermediate to the chain transfer agent is 1:0.08; and the mass-volume ratio of the intermediate to the solvent is 1g:10mL, to obtain the block copolymer.

[0104] The rest are the same as those in Example 1.

[0105] Performance test

[0106] 1. Release performance: according to the 4.3 construction performance detection standard in the standard JC / T949-2005 “Release agent for concrete products”, after the concrete is successfully released, the adhesion amount of the concrete and the appearance of the concrete are detected.

[0107] 2. Stability: According to the standard of JC / T 949-2005 "Release agent for concrete products", the release agent was diluted to a concentration of 0.02 g / mL as the experimental sample, and the experimental sample was placed at 25°C for 24 h. The uniformity and stratification of the experimental sample under natural light were observed. The test results are shown in Table 1.

[0108] Table 1

[0109]

[0110] As shown in Table 1, the block copolymer synthesized by using linseed oil, cardanol glycidyl ether and isocyanate acrylamide significantly improves the overall performance of the release agent, especially in the smoothness of demolding, high-temperature storage stability and low-temperature frost resistance. The comparative example 1 does not add the block copolymer, and the demolding effect is significantly reduced. In the comparative examples 2-5, a key reaction step is omitted when preparing the block copolymer, resulting in incomplete copolymer structure and significantly reduced performance.

[0111] The above description is only preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. An environmentally friendly water-soluble release agent, characterized in that, The raw materials include the following parts by weight: The raw materials for preparing the block copolymer include: flaxseed oil, isocyanate acrylamide, and cashew phenol glycidyl ether.

2. The environmentally friendly water-soluble release agent according to claim 1, characterized in that, The preparation of the block copolymer includes the following steps: S10, linseed oil, isocyanate acrylamide, catalyst and solvent are mixed and reacted to obtain a prepolymer; S20. The prepolymer, cashew phenol glycidyl ether, catalyst and solvent are mixed and reacted to obtain an intermediate. S30. Mix the intermediate, chain transfer agent and solvent, and react to obtain a block copolymer.

3. The environmentally friendly water-soluble release agent according to claim 2, characterized in that, In step S10, the molar ratio of the flaxseed oil to the isocyanate acrylamide is 1:1.05 to 1:1.2; In step S10, the mass ratio of the flaxseed oil to the catalyst is 100:0.5 to 100:2; In step S10, the mass-to-volume ratio of the flaxseed oil and the solvent is 1g:5mL to 1g:10mL; In step S10, the catalyst comprises dibutyltin dilaurate and / or stannous octoate; In step S10, the solvent includes at least one of acetone, tetrahydrofuran, and N,N-dimethylformamide.

4. The environmentally friendly water-soluble release agent according to claim 2, characterized in that, In step S10, the reaction temperature is 60–80°C, and the reaction time is 2–4 hours.

5. The environmentally friendly water-soluble release agent according to claim 2, characterized in that, In step S20, the molar ratio of the prepolymer to the cashew phenol glycidyl ether is 1:0.8 to 1:1.5; In step S20, the mass ratio of the prepolymer to the catalyst is 100:1 to 100:3; In step S20, the mass-to-volume ratio of the prepolymer to the solvent is 1g:5mL to 1g:10mL; In step S20, the catalyst comprises triethylamine and / or tetrabutylammonium bromide; In step S20, the solvent includes at least one of toluene, xylene, and N,N-dimethylformamide; In step S20, the reaction temperature is 40–60°C, and the reaction time is 4–6 hours.

6. The environmentally friendly water-soluble release agent according to claim 2, characterized in that, In step S30, the mass ratio of the intermediate to the chain transfer agent is 1:0.05 to 1:0.1; In step S30, the mass-to-volume ratio of the intermediate to the solvent is 1g:5mL to 1g:10mL; In step S30, the chain transfer agent includes isopropyl dithiobenzoate and / or benzyl dithiobenzoate. In step S30, the solvent includes at least one of tetrahydrofuran, ethyl acetate, and toluene.

7. The environmentally friendly water-soluble release agent according to claim 2, characterized in that, In step S30, the reaction temperature is 70–90°C, and the reaction time is 6–8 hours.

8. The environmentally friendly water-soluble release agent according to claim 1, characterized in that, The water-soluble resin includes at least one of the following: silicone-modified acrylic resin, water-soluble polyurethane resin, water-soluble epoxy resin, water-soluble phenolic resin, water-soluble polyester resin, and water-soluble alkyd resin. The thickener includes at least one of carrageenan, gellan gum, xanthan gum, agar, gelatin, sodium alginate, guar gum, guar gum, glucomannan, curdran gum, and sodium carboxymethyl cellulose. The stabilizer includes at least one of disodium EDTA, tetrasodium EDTA, sorbitol, maltitol, triethanolamine, diethanolamine, and monoethanolamine; The corrosion and rust inhibitor includes at least one of phosphate, sodium dehydroacetate, silane coupling agent, sodium benzoate, and potassium sorbate; The defoamer includes at least one of water-based silicone defoamer, acetylsadiol defoamer, polyether defoamer, modified siloxane defoamer, and fluorine-modified defoamer; The anti-icing agent includes alcohol.

9. A method for preparing the environmentally friendly water-soluble release agent according to any one of claims 1 to 8, characterized in that, Includes the following steps: An environmentally friendly water-soluble release agent is obtained by mixing water-soluble resin, block copolymer, thickener, stabilizer, anti-icing agent, anti-corrosion and anti-rust agent, defoamer and water.

10. The application of the environmentally friendly water-soluble release agent according to any one of claims 1 to 8 in building concrete.

Images