Preparation process of super-retarding water reducing agent for underwater secant pile

Abstract

The invention discloses a preparation process of a super-retarding water reducing agent for underwater secant piles, and relates to the field of water reducing agent preparation, and the preparation process comprises the following steps: preparation of a polyester polycarboxylic acid water reducing agent, preparation of a polyether polycarboxylic acid water reducing agent, proportioning of polysaccharides, polymeric amino acids and organic acids in a retarder, and preparation of the super-retarding water reducing agent. According to the preparation process of the super-retarding water reducing agent for the underwater secant pile, the polyester polycarboxylic acid water reducing agent and the polyether polycarboxylic acid water reducing agent are adopted as mother liquor for compounding, and low-cost raw materials are adopted for manufacturing, so that the production cost of the water reducing agent can be effectively reduced, and meanwhile, the simplification of the production of the water reducing agent is ensured; the water reducer is convenient to widely popularize and use, the initial setting time of concrete can be changed, secant piles can be conveniently cut when the concrete is subjected to initial setting, so that the pouring time of the next secant pile is conveniently grasped, the construction time of the secant piles is shortened, and the convenience of the water reducer in use is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of water reducing agent preparation, in particular to a preparation process of a super slow-setting water reducing agent for underwater bite piles. Background Art

[0002] In the process of pouring concrete underwater interlocking piles, it is necessary to cut and pour the concrete before the initial setting to form a continuous pile wall. Therefore, it is necessary to slow down the setting time of the concrete. However, if the setting time of the concrete is slowed down and the setting time is too long, the concrete will bleed, which will easily lead to the concrete being hardened and difficult to cut. In order to prolong the setting time of concrete and avoid bleeding, water reducing agent is added to the concrete during the mixing process. After being added to the concrete mixture, the water reducing agent can disperse the cement particles and reduce the water consumption of the same unit of concrete. In addition, the water reducing agent is generally used together with suspending agent, foam stabilizer, etc. during use, so as to improve the use effect of the water reducing agent. However, the existing water reducer still has certain use defects during use. It is difficult to evenly mix a large amount of coagulant into the water reducer, and a long period of stirring is required, which seriously affects the compounding production efficiency of the water reducer. If the polycarboxylate water reducer mixed with a large amount of retarder is left to stand for a long time, the retarder component content in the upper and lower water reducers will be different, which often causes some problems of short or long setting time in actual use, which is inconvenient to use. Patent application publication number CN103848944B discloses a method for preparing a super-slow-setting polycarboxylate water-reducing agent. The invention introduces a phosphonate structure with a slow-setting effect into the molecular structure of the water-reducing agent. The super-slow-setting polycarboxylate water-reducing agent prepared by the invention is directly used in concrete with a long setting time requirement, thereby eliminating the process of compounding the retarder, improving production efficiency, and making the product more uniform and stable, thereby avoiding abnormal setting time of the concrete. The various raw materials used are low in price, have good reaction activity, react thoroughly, and do not form precipitation that affects the performance of the water-reducing agent. The preparation method of the super-slow-setting polycarboxylate water-reducing agent does not use organic solvents, is non-toxic, and does not pollute the environment. Patent application announcement number CN104059199B discloses a polycarboxylic acid super-retarding water-reducing agent, its preparation method and use. It utilizes the principle of polymer structure design and adopts high-tech means to synthesize a super-retarding water-reducing agent with both water-reducing and retarding functions. The super-retarding agent is an organic polymer compound copolymerized by several functional monomers. Its molecular structure contains a large number of hydroxyl functional groups, which can form a stable complex with calcium ions in the cement paste and cover the surface of the cement hydration product to prevent cement hydration. The hydroxyl groups in the super-retarding agent structure can also be directly adsorbed on the surface of cement particles through hydrogen bonds, preventing direct contact between cement particles and water and preventing hydration. As the hydration process proceeds, this adsorption layer will gradually be consumed, and hydration will continue normally, so it will not affect the later hydration of cement. The obtained super-retarding water-reducing agent has good adaptability to the polycarboxylic acid water-reducing agent and can also be used in combination with it; In the above-mentioned public patent, the water reducer in the patent solves the above-mentioned problems, but the following problems still exist during the use of the water reducer: it is difficult to control the setting time of concrete during the use of the water reducer. When the interlocking pile is cast, the concrete needs to be cut when it is initially set, and the time required for the cutting process is difficult to control. At the same time, it is easy for the concrete to initially set too early or too late, which delays the time required for construction, easily affects the progress of construction, and easily makes the use effect of the water reducer difficult to control.

[0003] In view of the above problems, it is urgently necessary to carry out innovative design based on the original preparation process. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of a super slow setting water reducing agent for underwater interlocking piles, so as to solve the problem that it is difficult to control the setting time of concrete proposed in the above-mentioned background technology. When the concrete of the interlocking piles is initially set, it needs to be cut, and the time required for the cutting process is difficult to control. At the same time, the initial setting of the concrete is likely to be too early or too late, which delays the time required for construction, easily affects the progress of the construction, and easily leads to the problem that the use effect of the water reducing agent is difficult to control.

[0005] To achieve the above object, the present invention provides the following technical solution: a preparation process of a super slow-setting water-reducing agent for underwater bite piles, comprising the following steps; (1) Preparation of polyester polycarboxylic acid water reducer Pour polyethylene glycol and methacrylic acid into a reaction vessel and perform an esterification reaction, wherein the ratio of polyethylene glycol to methacrylic acid is 1:2.1, and the constant temperature reaction time is 5-6 hours. At the same time, the reaction temperature needs to be ensured to be 115-120 degrees Celsius and the gas pressure needs to be 1.5 Pascals; (2) Preparation of polyether polycarboxylic acid water reducer Pour isopentanol polyoxyethylene ether into a reaction container and dissolve it in water. The ratio of isopentanol polyoxyethylene ether to water in the reaction container is 1:5. The constant temperature reaction time is 4-5 hours. At the same time, the reaction temperature needs to be maintained at 60-80 degrees Celsius. (3) Proportion of polysaccharides, amino acids and organic acids in retarders The polysaccharide, the polymerized amino acid and the organic acid are mixed in a ratio of 5:4:1, poured into a container according to the design, and heated to react at a heating temperature of 45-50 degrees Celsius and a reaction time of about 2 hours.

[0006] (4) Preparation of super slow setting water reducing agent Pour the polyester polycarboxylate water-reducing agent and the polyether polycarboxylate water-reducing agent into a container in a ratio of 1:1 and mix and stir. After mixing for 8 minutes, pour in the retarder made of polysaccharide, polymerized amino acid and organic acid, and the retarder occupies 15%-5% of the liquid in the container. It takes 5 minutes. It can change the initial setting time of concrete, making it easier to cut the interlocking piles when the concrete is initially setting, thereby facilitating the control of the next interlocking pile pouring time and shortening the construction time of the interlocking piles. Preferably, the common raw material used in the preparation of the polyether polycarboxylic acid water-reducing agent is one of allyl polyoxyethylene ether, maleic anhydride and sodium vinyl sulfonate.

[0007] Preferably, an inhibitor and a catalyst need to be added in the preparation of the polyester polycarboxylic acid water-reducing agent, and the inhibitor is methacrylic acid, and the catalyst is toluenesulfonic acid, the amount of toluenesulfonic acid is 2% of the total mass of the alkyd, and the amount of methacrylic acid is 0.2% of the mass of methacrylic acid, and the reaction time of the catalyst and the inhibitor is 5 hours.

[0008] Preferably, an initiator can be added to the preparation of the polyether polycarboxylic acid water-reducing agent, and the initiator is one of tetraethylenetriamine (TEPA), ethylene oxide and propylene oxide, and the initiator occupies 1.5%-2% of the liquid in the internal container of the preparation of the polyether polycarboxylic acid water-reducing agent, and the reaction time of the initiator is 4 hours.

[0009] Preferably, the pH value of the solution in the preparation of the polyester polycarboxylic acid water-reducing agent is between 6 and 8, and the pH of the solution is adjusted by sodium hydroxide solution, and is added when the solution is at room temperature. At the same time, the sodium hydroxide solution needs to be stirred up and down after being added, and it needs to be checked at all times after stirring. The detection interval is 30-60 seconds. By stirring during the reaction process, different materials can be fully mixed, so that the materials can react evenly, while ensuring the quality of the reaction.

[0010] Preferably, the pH value of the solution in the preparation of the polyether polycarboxylic acid water-reducing agent is between 6 and 7.5, and the pH of the solution is adjusted by using a sulfuric acid solution, and the solution is added when it is at room temperature. At the same time, the sulfuric acid solution needs to be stirred up and down after being added, and it needs to be checked at all times after stirring, and the detection interval time is 30-60 seconds.

[0011] Preferably, a catalyst needs to be added during the mixing process of the polysaccharides, polymerized amino acids and organic acids in the retarder, and the catalyst is lime water, and the lime water accounts for 0.5% of the polysaccharides, polymerized amino acids and organic acids. Adding a catalyst during the preparation of the super retarder water reducer can accelerate the reaction within the solution and shorten the reaction time. By controlling the temperature and pressure of the reaction, the reaction speed can be further increased, thereby shortening the time required for the preparation process of the preparation process.

[0012] Preferably, in the preparation process of the polyester polycarboxylate water-reducing agent and the polyether polycarboxylate water-reducing agent, the inside of the reaction container needs to be stirred, and the stirring needs to make the materials inside the reaction container turn upside down to ensure the uniformity of heating of the materials inside the reaction container and the reaction rate. During the solidification process of the concrete added with the water-reducing agent, the state of the concrete structure is disturbed without obvious changes, which can ensure the stability of concrete coagulation, not easy to produce cracks, and ensure the firmness and safety of the concrete cast building.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By controlling the dosage of the water reducer, the initial setting time of the concrete can be changed, which makes it easier to cut the interlocking piles when the concrete is initially setting, thereby facilitating the control of the pouring time of the next interlocking pile, thereby shortening the construction time of the interlocking piles and effectively improving the convenience of using the water reducer; 2. By using polyester polycarboxylic acid water-reducing agent and polyether polycarboxylic acid water-reducing agent as mother liquor for compounding, and adding polysaccharide, polymeric amino acid and organic acid solution at the same time, and using low-cost raw materials for production, the production cost of the water-reducing agent can be effectively reduced, and the simplicity of the production of the water-reducing agent is ensured, so that the water-reducing agent can be widely promoted and used; 3. Furthermore, during the solidification process of the concrete with the water reducing agent added, the state of the concrete structure is not significantly changed by the disturbance, which can ensure the stability of the concrete solidification, and is not easy to produce cracks, thus ensuring the firmness and safety of the concrete pouring building; 4. Furthermore, by adding a catalyst during the preparation of the super slow setting water reducing agent, the reaction within the solution can be accelerated, the reaction time can be shortened, and by controlling the temperature and pressure of the reaction, the reaction speed can be further increased, thereby shortening the time required for the preparation process; 5. Furthermore, by stirring during the reaction, different materials can be fully mixed, so that the materials can react evenly while ensuring the quality of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the preparation process structure of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Embodiment 1: This embodiment Figure 1 As shown, in order to solve the problem that the existing water-reducing agent is difficult to control the setting time of concrete, the preparation process of the super-retarding water-reducing agent is disclosed, and the effect that the preparation of the super-retarding water-reducing agent can effectively control the setting time of concrete is achieved. The specific contents are as follows: When using the preparation process of the super slow setting water reducing agent for underwater bite piles, firstly, the raw materials and equipment required for the preparation process are fully prepared; (1) Preparation of polyester polycarboxylic acid water reducer Pour polyethylene glycol and methacrylic acid into a reaction vessel and perform an esterification reaction, wherein the ratio of polyethylene glycol to methacrylic acid is 1:2.1, and the constant temperature reaction time is 5 hours. At the same time, the reaction temperature needs to be ensured to be 115 degrees Celsius and the gas pressure needs to be 1.5 Pascals; (2) Preparation of polyether polycarboxylic acid water reducer Pour isopentanol polyoxyethylene ether into a reaction container and dissolve it in water. The ratio of isopentanol polyoxyethylene ether to water in the reaction container is 1:5. The constant temperature reaction time is 4 hours. At the same time, the reaction temperature needs to be maintained at 60 degrees Celsius. (3) Proportion of polysaccharides, amino acids and organic acids in retarders The polysaccharide, the polymerized amino acid and the organic acid are mixed in a ratio of 5:4:1, poured into a container according to the design, and heated to react at a heating temperature of 45 degrees Celsius and a reaction time of about 1 hour.

[0017] (4) Preparation of super slow setting water reducing agent Pour the polyester polycarboxylate water-reducing agent and the polyether polycarboxylate water-reducing agent into a container in a ratio of 1:1 and mix and stir. After mixing for 8 minutes, pour in the retarder made of polysaccharide, polymerized amino acid and organic acid. The retarder occupies 15%-5% of the liquid in the container. It needs to be left for 5 minutes. The commonly used raw materials in the preparation of polyether polycarboxylic acid water reducer are one of allyl polyoxyethylene ether, maleic anhydride and sodium vinyl sulfonate.

[0018] In the preparation of polyester polycarboxylic acid water-reducing agent, an inhibitor and a catalyst need to be added, and the inhibitor is methacrylic acid, and the catalyst is toluenesulfonic acid. The amount of toluenesulfonic acid is 2% of the total mass of alkyd, and the amount of methacrylic acid is 0.2% of the mass of methacrylic acid. The reaction time of the catalyst and the inhibitor is 5 hours.

[0019] An initiator can be added to the preparation of the polyether polycarboxylic acid water reducer, and the initiator is one of tetraethylenetriamine (TEPA), ethylene oxide and propylene oxide, and the initiator occupies 1.5%-2% of the liquid in the internal container of the preparation of the polyether polycarboxylic acid water reducer, and the reaction time of the initiator is 4 hours.

[0020] In the preparation of polyester polycarboxylic acid water-reducing agent, the pH value of the solution is between 6 and 8, and the pH of the solution is adjusted by sodium hydroxide solution, which is added when the solution is at room temperature. At the same time, after the sodium hydroxide solution is added, it needs to be stirred up and down, and it needs to be checked at all times after stirring, and the detection interval is 30-60 seconds.

[0021] In the preparation of polyether polycarboxylic acid water-reducing agent, the pH value of the solution is between 6-7.5, and the pH of the solution is adjusted by sulfuric acid solution, and it is added when the solution is at room temperature. At the same time, after the sulfuric acid solution is added, it needs to be stirred up and down, and it needs to be checked at all times after stirring, and the detection interval is 30-60 seconds.

[0022] A catalyst needs to be added during the mixing process of the polysaccharides, polymerized amino acids and organic acids in the retarder, and the catalyst is lime water, and the lime water accounts for 0.5% of the polysaccharides, polymerized amino acids and organic acids.

[0023] In the preparation process of polyester polycarboxylic acid water reducer and polyether polycarboxylic acid water reducer, the inside of the reaction vessel needs to be stirred, and the stirring needs to make the materials inside the reaction vessel turn upside down to ensure the uniformity of heating and reaction rate of the materials inside the reaction vessel. In the process of preparing the super slow setting water reducing agent, the preparation process is effectively simplified, creating conditions for the rapid preparation of the super slow setting water reducing agent, and at the same time accelerating the speed of the preparation and production of the super slow setting water reducing agent; The water reducer can change the initial setting time of concrete, making it easier to carry out other construction when the concrete is initially setting, creating conditions for other construction, and at the same time ensuring the controllability of the initial setting of the concrete, thereby shortening the construction time of the interlocking piles and improving the convenience of using the water reducer; At the same time, during the preparation process, the amount of the catalyst should be appropriately adjusted according to the amount of the solution ratio, so as to ensure the catalytic effect of the catalyst and increase the overall practicality.

[0024] Embodiment 2: This embodiment is as follows Figure 1 As shown, the entire preparation process of the super slow setting water reducing agent is disclosed, and the specific contents are as follows: Pour polyethylene glycol and methacrylic acid into a reaction vessel and perform an esterification reaction, wherein the ratio of polyethylene glycol to methacrylic acid is 1:2.1, and the constant temperature reaction time is 1 hour. At the same time, the reaction temperature needs to be ensured to be 120 degrees Celsius and the gas pressure needs to be 1.5 Pascals; Pour isopentanol polyoxyethylene ether into a reaction container and dissolve it in water. The ratio of isopentanol polyoxyethylene ether to water in the reaction container is 1:5. The constant temperature reaction time is 1 hour. At the same time, the reaction temperature needs to be maintained at 80 degrees Celsius. The polysaccharide, the polymerized amino acid and the organic acid are mixed in a ratio of 5:4:1, poured into a container according to the design, and heated to react at a heating temperature of 50 degrees Celsius and a reaction time of about 2 hours.

[0025] Pour the polyester polycarboxylate water-reducing agent and the polyether polycarboxylate water-reducing agent into a container in a ratio of 1:1 and mix and stir. After mixing for 8 minutes, pour in the retarder made of polysaccharide, polymerized amino acid and organic acid, and the retarder occupies 15%-5% of the liquid in the container. It takes 5 minutes. The commonly used raw materials in the preparation of polyether polycarboxylic acid water reducer are one of allyl polyoxyethylene ether, maleic anhydride and sodium vinyl sulfonate.

[0026] In the preparation of polyester polycarboxylic acid water-reducing agent, an inhibitor and a catalyst need to be added, and the inhibitor is methacrylic acid, and the catalyst is toluenesulfonic acid. The amount of toluenesulfonic acid is 2% of the total mass of alkyd, and the amount of methacrylic acid is 0.2% of the mass of methacrylic acid. The reaction time of the catalyst and the inhibitor is 5 hours.

[0027] An initiator can be added to the preparation of the polyether polycarboxylic acid water reducer, and the initiator is one of tetraethylenetriamine (TEPA), ethylene oxide and propylene oxide, and the initiator occupies 1.5%-2% of the liquid in the internal container of the preparation of the polyether polycarboxylic acid water reducer, and the reaction time of the initiator is 4 hours.

[0028] In the preparation of polyester polycarboxylic acid water-reducing agent, the pH value of the solution is between 6 and 8, and the pH of the solution is adjusted by sodium hydroxide solution, which is added when the solution is at room temperature. At the same time, after the sodium hydroxide solution is added, it needs to be stirred up and down, and it needs to be checked at all times after stirring, and the detection interval is 30-60 seconds.

[0029] In the preparation of polyether polycarboxylic acid water-reducing agent, the pH value of the solution is between 6-7.5, and the pH of the solution is adjusted by sulfuric acid solution, and it is added when the solution is at room temperature. At the same time, after the sulfuric acid solution is added, it needs to be stirred up and down, and it needs to be checked at all times after stirring, and the detection interval is 30-60 seconds.

[0030] A catalyst needs to be added during the mixing process of the polysaccharides, polymerized amino acids and organic acids in the retarder, and the catalyst is lime water, and the lime water accounts for 0.5% of the polysaccharides, polymerized amino acids and organic acids; By using polyester polycarboxylic acid water reducer and polyether polycarboxylic acid water reducer as mother liquor for compounding, and adding polysaccharide, polymeric amino acid and organic acid solution, low-cost raw materials can be used for production, which can effectively reduce the production cost of the water reducer, and at the same time ensure the simplicity of production of the water reducer, so as to facilitate the wide promotion and use of the water reducer.

[0031] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation process of a super slow setting water reducing agent for underwater bite piles, characterized in that: The method comprises the following steps: (1) Preparation of polyester polycarboxylic acid water reducer Pour polyethylene glycol and methacrylic acid into a reaction vessel and perform an esterification reaction, wherein the ratio of polyethylene glycol to methacrylic acid is 1:2.1, and the reaction vessel needs to be kept sealed, the constant temperature reaction time is 5-6 hours, and the reaction temperature needs to be ensured to be 115-120 degrees Celsius and the gas pressure is 1.5 Pascals; (2) Preparation of polyether polycarboxylic acid water reducer Pour isopentanol polyoxyethylene ether into a reaction container and dissolve it in water. The ratio of isopentanol polyoxyethylene ether to water in the reaction container is 1:

5. The constant temperature reaction time is 4-5 hours. At the same time, the reaction temperature needs to be maintained at 60-80 degrees Celsius. (3) Proportion of polysaccharides, amino acids and organic acids in retarders The polysaccharide, the polymerized amino acid and the organic acid are mixed in a ratio of 5:4:1, and the polysaccharide, the polymerized amino acid and the organic acid are poured into a container according to the design, and heated to react at a heating temperature of 45-50 degrees Celsius and a reaction time of about 2 hours; (4) Preparation of super slow setting water reducing agent Pour the polyester polycarboxylate water-reducing agent and the polyether polycarboxylate water-reducing agent into a container in a ratio of 1:1 and mix and stir. After mixing for 8 minutes, pour in the retarder made of polysaccharide, polymerized amino acid and organic acid, and the retarder occupies 15%-5% of the liquid inside the container. It needs to be left for 5 minutes.

2. The preparation process of a super slow setting water reducing agent for underwater occlusal piles according to claim 1, characterized in that: The commonly used raw material in the preparation of the polyether polycarboxylic acid water-reducing agent is one of allyl polyoxyethylene ether, maleic anhydride and sodium vinyl sulfonate.

3. The preparation process of a super slow setting water reducing agent for underwater occlusal piles according to claim 1, characterized in that: In the preparation of the polyester polycarboxylic acid water-reducing agent, an inhibitor and a catalyst need to be added, and the inhibitor is methacrylic acid, and the catalyst is toluenesulfonic acid, the amount of toluenesulfonic acid is 2% of the total mass of the alkyd, and the amount of methacrylic acid is 0.2% of the mass of methacrylic acid, and the reaction time of the catalyst and the inhibitor is 5 hours.

4. The preparation process of a super slow setting water reducing agent for underwater occlusal piles according to claim 1, characterized in that: The preparation of the polyether polycarboxylic acid water-reducing agent may include an initiator, and the initiator is one of tetraethylenetriamine (TEPA), ethylene oxide and propylene oxide, and the initiator occupies 1.5%-2% of the liquid in the internal container of the preparation of the polyether polycarboxylic acid water-reducing agent, and the reaction time of the initiator is 4 hours.

5. The preparation process of a super slow setting water reducing agent for underwater occlusal piles according to claim 1, characterized in that: The pH value of the solution in the preparation of the polyester polycarboxylic acid water-reducing agent is between 6 and 8, and the pH of the solution is adjusted by using a sodium hydroxide solution, which is added when the solution is at room temperature. At the same time, the sodium hydroxide solution needs to be stirred up and down after being added, and it needs to be checked at all times after stirring, and the detection interval time is 30-60 seconds.

6. The preparation process of a super slow setting water reducing agent for underwater occlusal piles according to claim 1, characterized in that: In the preparation of the polyether polycarboxylic acid water-reducing agent, the pH value of the solution is between 6 and 7.5, and the solution pH is adjusted by using a sulfuric acid solution, which is added when the solution is at room temperature. At the same time, the sulfuric acid solution needs to be stirred up and down after being added, and it needs to be checked at all times after stirring, and the detection interval time is 30-60 seconds.

7. The preparation process of a super slow setting water reducing agent for underwater occlusal piles according to claim 1, characterized in that: A catalyst needs to be added during the mixing process of the polysaccharides, polymerized amino acids and organic acids in the retarder, and the catalyst is lime water, and the lime water accounts for 0.5% of the polysaccharides, polymerized amino acids and organic acids.

8. The preparation process of a super slow setting water reducing agent for underwater occlusal piles according to claim 1, characterized in that: In the preparation process of the polyester polycarboxylate water-reducing agent and the polyether polycarboxylate water-reducing agent, the inside of the reaction container needs to be stirred, and the stirring needs to make the materials inside the reaction container turn upside down to ensure the uniformity of heating of the materials inside the reaction container and the reaction rate.

Images