CN111073750A - Fair-faced concrete release agent and preparation method thereof - Google Patents
Fair-faced concrete release agent and preparation method thereof Download PDFInfo
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- CN111073750A CN111073750A CN201911162906.2A CN201911162906A CN111073750A CN 111073750 A CN111073750 A CN 111073750A CN 201911162906 A CN201911162906 A CN 201911162906A CN 111073750 A CN111073750 A CN 111073750A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M173/00—Lubricating compositions containing more than 10% water
- C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/384—Treating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/388—Treating surfaces of moulds, cores, or mandrels to prevent sticking with liquid material, e.g. lubricating
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- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
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- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
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- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
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- C10M2207/28—Esters
- C10M2207/287—Partial esters
- C10M2207/289—Partial esters containing free hydroxy groups
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/082—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type monocarboxylic
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/086—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type polycarboxylic, e.g. maleic acid
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
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- C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
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- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/042—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds between the nitrogen-containing monomer and an aldehyde or ketone
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- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/042—Sulfate esters
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Abstract
The invention provides a bare concrete mold release agent, and belongs to the technical field of concrete additives. Comprises the following components in parts by weight: 3-5 parts of nano zinc oxide, 0.5-2 parts of a silane coupling agent, 70-90 parts of an acrylate monomer, 50-60 parts of allyl polyoxyethylene ether, 10-20 parts of an organic silicon monomer, 1-5 parts of an emulsifier, 1-2 parts of an initiator, 0.5-1 part of sodium bicarbonate, 0.5-1 part of a defoaming agent, 0.5-1.5 parts of a dispersing agent, 0.5-1.5 parts of a flatting agent, 0.5-1.5 parts of a film-forming assistant, 1-3 parts of a thickening agent and 150-250 parts of deionized water. The invention also provides a preparation method of the release agent. The release agent has good stability, good adhesion performance to various steel moulds and wood moulds and good scouring resistance; the demolding effect is good, the surface of the demolded concrete is flat, smooth, fine, smooth, few in bubbles and glossy, the mirror surface effect of the fair-faced concrete is presented, and the appearance quality of the concrete can be greatly improved; the paint can be used for many times by one-time coating, and has low cost, excellent antirust and waterproof performances.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to an as-cast finish concrete release agent and a preparation method thereof.
Background
In recent years, with the rise of green buildings and the improvement of environmental awareness, more and more buildings adopt the fair-faced concrete technology. The bare concrete has high requirements on the apparent quality of the concrete, and requires the surface of the concrete to be smooth, the color to be uniform and consistent and no obvious air bubbles.
The type, quality and construction process of the release agent are of great importance to the apparent quality of the concrete. The release agent on the market at present has a plurality of problems in the use process, and the effect can not meet the requirements of fair-faced concrete. The oily release agent easily pollutes the surface of concrete to form secondary pollution; the emulsion release agent has the defects of insufficient durability after film forming, easy freezing at low temperature, insufficient rain wash resistance and the like; the paint release agent has high requirements on brushing, heavy construction smell and large difficulty in cleaning the template.
Disclosure of Invention
The invention aims to provide a novel fair-faced concrete release agent and a preparation method thereof aiming at the defects of the existing release agent.
The purpose of the invention is realized by the following technical scheme:
the clear water concrete release agent comprises the following components in parts by weight: 3-5 parts of nano zinc oxide, 0.5-2 parts of a silane coupling agent, 70-90 parts of an acrylate monomer, 50-60 parts of allyl polyoxyethylene ether, 10-20 parts of an organic silicon monomer, 1-5 parts of an emulsifier, 1-2 parts of an initiator, 0.5-1 part of sodium bicarbonate, 0.5-1 part of a defoaming agent, 0.5-1.5 parts of a dispersing agent, 0.5-1.5 parts of a flatting agent, 0.5-1.5 parts of a film-forming assistant, 1-3 parts of a thickening agent and 150-250 parts of deionized water. The allyl polyoxyethylene ether can effectively reduce the adhesive force between the concrete and the template, so that the concrete cannot be adhered to the template when the concrete is demoulded; the organosilicon monomer can improve the stability of the concrete release agent so as to be suitable for different construction environments of concrete; the acrylic ester monomer can improve the flexibility of the concrete release agent, is not easy to damage and prolongs the service life of the concrete release agent; the delayed coagulation and rust inhibiting effect of nano zinc oxide can lower the apparent defect of concrete effectively.
Further, the acrylic ester monomer is selected from one or more of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate. The function of the coating is to increase the flexibility of the coating and ensure that the concrete release agent is not easy to damage.
Further, the organic silicon monomer is one or more of vinyl trimethyl silane, allyl trimethoxy silane, allyloxy trimethyl silane and allyl trimethyl silane. The organic silicon monomer can endow the concrete release agent with good high and low temperature resistance, air permeability, weather resistance and wear resistance.
Further, the emulsifier is two or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, Span-60, Tween-60, Span-80 and Tween-60. The emulsifier is used for dispersing the reaction substances to carry out emulsion polymerization, and the emulsion polymerized finished product is used as a main film forming substance of the release agent.
Further, the initiator is one of Ammonium Persulfate (APS), potassium persulfate (KPS) and Sodium Persulfate (SPS).
Further, the silane coupling agent is one of 3- (trimethoxysilyl) propyl methacrylate and (3-aminopropyl) triethoxysilane.
Further, the defoaming agent is compounded by one or more of tributyl phosphate, an organic silicon defoaming agent and a polyether defoaming agent; the dispersing agent is formed by compounding one or more of polycarboxylate, sodium polyacrylate and sodium hexametaphosphate; the flatting agent is one or more of acrylic resin, urea-formaldehyde resin and melamine-formaldehyde resin; the film-forming auxiliary agent is one or more of ethylene glycol ethyl ether, ethylene glycol butyl ether, propylene glycol butyl ether and propylene glycol methyl ether acetate; the thickening agent is one or more of methylcellulose, sodium carboxymethylcellulose and hydroxyethyl cellulose. The defoaming agent is mainly used for eliminating apparent large bubbles of concrete; the dispersing agent is mainly used for depolymerization and dispersion of film forming substances and nano zinc oxide; the leveling agent mainly enables the concrete release agent to be capable of flatly and smoothly coating on the template; the film-forming assistant mainly reduces the film-forming temperature of the concrete release agent; the thickener mainly improves the sagging performance of the concrete release agent.
A preparation method of an as-cast finish concrete release agent comprises the following steps:
1) modification of nano zinc oxide
Mixing isopropanol and deionized water, adding a silane coupling agent, fully stirring, adding nano zinc oxide, performing ultrasonic dispersion, drying and ball milling to obtain modified nano zinc oxide;
through the modification of the nano zinc oxide, the nano zinc oxide can show good dispersibility in the concrete release agent emulsion without aggregation and deposition.
2) Preparation of organosilicon modified polyether ester emulsion
A. Adding deionized water, emulsifier and NaHCO into a reaction vessel3After stirring and dissolving, adding allyl polyoxyethylene ether, acrylate monomer and organic silicon monomer, and stirring at high speed for pre-emulsification to prepare pre-emulsion;
B. taking a part of pre-emulsion, heating, then dropwise adding a part of initiator, reacting until blue light appears and no reflux occurs, and obtaining seed emulsion;
C. dropwise adding the rest initiator and the pre-emulsion into the seed emulsion, keeping the temperature for a period of time, adding the modified nano zinc oxide, cooling to room temperature after ultrasonic dispersion, adjusting the pH, sieving, and discharging to obtain the organic silicon modified polyether ester emulsion;
compared with direct in-situ polymerization, the seed emulsion polymerization has the advantages of more uniform emulsion particle distribution, higher dispersion degree of the nano zinc oxide, less required emulsifier and more stable performance of the concrete mold release agent.
3) Preparation of bare concrete release agent
And adding a dispersing agent, a flatting agent and a film forming agent into deionized water, dispersing and stirring at a high speed, adding a defoaming agent, a thickening agent and the organic silicon modified polyether ester emulsion, and stirring and uniformly mixing to obtain the bare concrete release agent.
The concrete release agent prepared by the method has the characteristics that the particle size of latex particles is in unimodal distribution, nano zinc oxide particles are uniformly and stably dispersed in the latex, and the release agent has strong adhesive force to a template, good release effect, scouring resistance, temperature resistance and the like.
Further, in the step 1), the ultrasonic dispersion time is 15-20 min; the drying is carried out by firstly drying to be semi-dry at the temperature of 70-90 ℃, then drying to be fully dry at the temperature of 110-130 ℃, and ball milling is carried out until the fineness is less than 20 mu m.
Further, in the step 2) B, the temperature rise is 70-90 ℃.
Further, in the step 2) C, the total dropping time of the initiator and the pre-emulsion is 2.5-3.0 h, and the heat preservation time is 1-1.5 h; the ultrasonic dispersion time is 25-35 min, and the pH value is adjusted to 8-9 by adopting ammonia water.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the modified nano zinc oxide is introduced into the release agent, so that the setting time of the slurry on the surface of the concrete is delayed, and the slurry can break or move the generated bubbles to the inside due to the action of gravity, thereby improving the apparent mass of the concrete; meanwhile, the modified nano zinc oxide can prevent the concrete from rusting and prevent the concrete template from polluting the surface of the concrete due to rusting.
2. According to the invention, allyl polyoxyethylene ether, acrylate monomer and organosilicon monomer are polymerized by emulsion to synthesize organosilicon modified polyether ester, and the organosilicon modified polyether ester is used as a main film forming substance of the release agent, so that the release agent has the characteristics of strong adhesive force, good release effect, scouring resistance, temperature resistance, repeated use and the like.
3. The bare concrete release agent has good stability, good adhesion performance to various steel moulds and wood moulds and good washability; the demolding effect is good, the surface of the demolded concrete is flat, smooth, fine, smooth, few in bubbles and glossy, the mirror surface effect of the fair-faced concrete is presented, and the appearance quality of the concrete can be greatly improved; the paint can be used for multiple times after being coated once, has low use cost and has excellent antirust and waterproof performances.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The concrete preparation process of the bare concrete mold release agent in the embodiment is as follows:
1. modification of nano zinc oxide
Uniformly mixing 12 parts of isopropanol and 2 parts of deionized water, adding 1.5 parts of silane coupling agent 3- (trimethoxysilyl) propyl methacrylate, fully stirring for 1h, then adding 5 parts of nano zinc oxide, dispersing for 20min by using ultrasonic waves, then drying in an oven at 80 ℃ to be semi-dry, then drying at 120 ℃ to be fully dry, and finally grinding in a ball mill until the fineness is less than 20 mu m. .
2. Preparation of organosilicon modified polyether ester emulsion
150 parts of deionized water, 2 parts of sodium dodecyl sulfate, 1 part of Span-60 and 0.5 part of NaHCO are added into a four-neck flask provided with a stirring device, a peristaltic pump, a reflux condenser and a thermometer3Stirring and dissolving at room temperature, mixing 50 parts of allyl polyoxyethylene ether, 30 parts of methyl methacrylate, 20 parts of ethyl acrylate, 20 parts of butyl methacrylate and 15 parts of vinyl trimethylsilane, and stirring at a high speed of 2500-3000 r/min for pre-emulsification to prepare a pre-emulsion;
heating 1/3 pre-emulsion to 80 ℃, dropwise adding 1/3 initiator solution, reacting until blue light appears and no reflux occurs, and obtaining seed emulsion;
and (2) dropwise adding the rest 2/3 initiator and 2/3 pre-emulsion into the seed emulsion, keeping the total dropwise adding time for 2.5h, keeping the temperature for 1.5h, adding the modified nano zinc oxide prepared in the step (1), ultrasonically dispersing for 30min, cooling to room temperature, adjusting the pH value to 8 by using ammonia water, filtering by using a 200-mesh sieve, and discharging to obtain the organic silicon modified polyether ester emulsion.
3. Preparation of bare concrete release agent
Weighing 50 parts of deionized water, adding 0.5 part of sodium polyacrylate, 1 part of acrylic resin and 1 part of ethylene glycol ethyl ether, dispersing and stirring at a high speed of 2500r/min for 10min, adding 1 part of tributyl phosphate, 3 parts of methylcellulose and the emulsion of the organic silicon modified polyether ester obtained in the step 2, and uniformly stirring at a low speed of 500r/min to obtain the clear water concrete release agent HT-1.
Example 2
The concrete preparation process of the bare concrete mold release agent in the embodiment is as follows:
1. modification of nano zinc oxide
The same as in example 1.
2. Preparation of organosilicon modified polyether ester emulsion
Adding 180 parts of deionized water, 1.5 parts of sodium dodecyl benzene sulfonate, 1 part of Span-60 and 0.8 part of NaHCO into a four-neck flask provided with a stirring device, a peristaltic pump, a reflux condenser and a thermometer3Stirring and dissolving at room temperature, mixing 60 parts of allyl polyoxyethylene ether, 30 parts of methyl methacrylate, 20 parts of methyl acrylate, 40 parts of butyl acrylate, 10 parts of allyl trimethylsilane and 10 parts of allyl trimethoxy silane, and stirring and pre-emulsifying at 3000r/min to prepare a pre-emulsion;
heating 1/3 pre-emulsion to 85 ℃, dropwise adding 1/3 initiator solution, reacting until blue light appears and no reflux occurs, and obtaining seed emulsion;
and then, dropwise adding the residual 2/3 initiator and 2/3 pre-emulsion for 3.0h, preserving heat for 1h, adding the modified nano zinc oxide prepared in the step 1, dispersing for 25min by ultrasonic waves, cooling to room temperature, adjusting the pH value to 9 by using ammonia water, sieving by using a 200-mesh sieve, and discharging to obtain the organic silicon modified polyether ester emulsion.
3. Preparation of bare concrete release agent
Weighing 50 parts of deionized water, adding 1 part of sodium hexametaphosphate, 1.5 parts of urea-formaldehyde resin and 1 part of ethylene glycol butyl ether, dispersing and stirring at a high speed of 2500r/min for 10min, adding 0.5 part of an organic silicon defoamer, 2 parts of sodium carboxymethylcellulose and the emulsion of the organic silicon modified polyether ester obtained in the step (2), and uniformly stirring at a low speed of 300r/min to obtain the clear water concrete release agent HT-2.
Testing of Release agent Performance
Comparative example 1: commercially available aqueous concrete release agents;
comparative example 2: based on the example 1, the modified nano zinc oxide is not doped, and other components and the preparation process are not changed.
Comparative example 3: based on the example 1, the nano zinc oxide is directly added without modifying the nano zinc oxide, and other components and the preparation process are not changed.
The release agents of example 1, example 2, comparative example 1, comparative example 2 and comparative example 3 were subjected to a release test for C30 general concrete in accordance with "release agent for concrete article" (JC/T949-:
TABLE 1 Release agent Performance test results
As can be seen from the comparison of Table 1, the fair-faced concrete mold release agent prepared in the embodiments 1 and 2 has good mold release performance, good stability and erosion resistance compared with the water-based mold release products in the market, can effectively improve the apparent quality of concrete, and can prevent the concrete template from polluting the surface of the concrete due to corrosion, so that the concrete has the mirror effect of the fair-faced concrete; compared with the comparative example 2, the air bubble content of the concrete surface layer can be reduced, and the concrete is more resistant to scouring and free of rust stain; compared with the comparative example 3, the nano particles are dispersed more uniformly and stably, are not layered after being placed for a long time, and have stronger anti-corrosion effect on the template.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The fair-faced concrete release agent is characterized by comprising the following components in parts by weight: 3-5 parts of nano zinc oxide, 0.5-2 parts of a silane coupling agent, 70-90 parts of an acrylate monomer, 50-60 parts of allyl polyoxyethylene ether, 10-20 parts of an organic silicon monomer, 1-5 parts of an emulsifier, 1-2 parts of an initiator, 0.5-1 part of sodium bicarbonate, 0.5-1 part of a defoaming agent, 0.5-1.5 parts of a dispersing agent, 0.5-1.5 parts of a flatting agent, 0.5-1.5 parts of a film-forming assistant, 1-3 parts of a thickening agent and 150-250 parts of deionized water.
2. The as-cast finish concrete mold release agent as defined in claim 1, wherein the acrylic ester monomer is one or more selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate.
3. The as-cast finish concrete mold release agent as defined in claim 1, wherein the silicone monomer is one or more of vinyltrimethylsilane, allyltrimethoxysilane, allyloxytrimethylsilane and allyltrimethylsilane.
4. The fair-faced concrete mold release agent as claimed in claim 1, wherein the emulsifier is two or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, Span-60, Tween-60, Span-80 and Tween-60; the initiator is one of Ammonium Persulfate (APS), potassium persulfate (KPS) and Sodium Persulfate (SPS); the silane coupling agent is one of 3- (trimethoxysilyl) propyl methacrylate and (3-aminopropyl) triethoxysilane.
5. The fair-faced concrete mold release agent as claimed in claim 1, wherein the defoamer is one or more of tributyl phosphate, an organic silicon defoamer and a polyether defoamer; the dispersing agent is formed by compounding one or more of polycarboxylate, sodium polyacrylate and sodium hexametaphosphate; the flatting agent is one or more of acrylic resin, urea-formaldehyde resin and melamine-formaldehyde resin; the film-forming auxiliary agent is one or more of ethylene glycol ethyl ether, ethylene glycol butyl ether, propylene glycol butyl ether and propylene glycol methyl ether acetate; the thickening agent is one or more of methylcellulose, sodium carboxymethylcellulose and hydroxyethyl cellulose.
6. A method of preparing as-cast finish concrete release agents as claimed in any one of claims 1 to 5, comprising the steps of:
1) modification of nano zinc oxide
Mixing isopropanol and deionized water, adding a silane coupling agent, fully stirring, adding nano zinc oxide, performing ultrasonic dispersion, drying and ball milling to obtain modified nano zinc oxide;
2) preparation of organosilicon modified polyether ester emulsion
A. Adding deionized water, emulsifier and NaHCO into a reaction vessel3After stirring and dissolving, adding allyl polyoxyethylene ether, acrylate monomer and organic silicon monomer, and stirring at high speed for pre-emulsification to prepare pre-emulsion;
B. taking a part of pre-emulsion, heating, then dropwise adding a part of initiator, reacting until blue light appears and no reflux occurs, and obtaining seed emulsion;
C. dropwise adding the rest initiator and the pre-emulsion into the seed emulsion, keeping the temperature for a period of time, adding the modified nano zinc oxide, cooling to room temperature after ultrasonic dispersion, adjusting the pH, sieving, and discharging to obtain the organic silicon modified polyether ester emulsion;
3) preparation of bare concrete release agent
And adding a dispersing agent, a flatting agent and a film forming agent into deionized water, dispersing and stirring at a high speed, adding a defoaming agent, a thickening agent and the organic silicon modified polyether ester emulsion, and stirring and uniformly mixing to obtain the bare concrete release agent.
7. The preparation method of the as-cast finish concrete release agent as claimed in claim 6, wherein in the step 1), the ultrasonic dispersion time is 15-20 min; the drying is carried out by firstly drying to be semi-dry at the temperature of 70-90 ℃ and then drying to be completely dry at the temperature of 110-130 ℃; the ball milling is carried out until the fineness is less than 20 mu m.
8. The method for preparing the as-cast finish concrete release agent as claimed in claim 6, wherein in the step 2) B, the temperature rise is 70-90 ℃.
9. The method for preparing the as-cast finish concrete release agent as claimed in claim 6, wherein in the step 2) C, the total dropping time of the initiator and the pre-emulsion is 2.5-3.0 h, and the heat preservation time is 1-1.5 h; the ultrasonic dispersion time is 25-35 min, and the pH value is adjusted to 8-9 by adopting ammonia water.
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| CN113172748A (en) * | 2021-04-27 | 2021-07-27 | 平凉市新世纪建筑工程有限责任公司 | Construction method of concrete cylindrical formwork |
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| CN113172748A (en) * | 2021-04-27 | 2021-07-27 | 平凉市新世纪建筑工程有限责任公司 | Construction method of concrete cylindrical formwork |
| CN113652122A (en) * | 2021-08-25 | 2021-11-16 | 佛山市创特包装材料有限公司 | Concrete long-acting demolding coating and preparation method thereof |
| CN114181763A (en) * | 2021-12-16 | 2022-03-15 | 武汉金安顺科技有限公司 | High-adhesion prefabricated part release agent and preparation method thereof |
| CN115287115A (en) * | 2022-08-05 | 2022-11-04 | 中冶武汉冶金建筑研究院有限公司 | Water-based concrete release agent and preparation method thereof |
| CN115386416A (en) * | 2022-08-11 | 2022-11-25 | 中冶武汉冶金建筑研究院有限公司 | Water-based concrete release agent and preparation method thereof |
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