CN110950571A - Machine-made sand regulator - Google Patents
Machine-made sand regulator Download PDFInfo
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- CN110950571A CN110950571A CN201911316748.1A CN201911316748A CN110950571A CN 110950571 A CN110950571 A CN 110950571A CN 201911316748 A CN201911316748 A CN 201911316748A CN 110950571 A CN110950571 A CN 110950571A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
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- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of buildings and discloses a machine-made sand regulator, which can be freely prepared by a user according to requirements by separately preparing and combining a plurality of regulators, thereby preparing the machine-made sand regulator adapting to the environment, has good adaptability and practicability, avoids the phenomena of the concrete binder from drying the whole concrete binder and reducing the binding power thereof after the cement is dried along with time due to the addition of the cement by adding materials such as coal tar, furfural, curing agent and the like into epoxy resin through the setting of the binder, thereby avoiding the phenomena of concrete slag falling and the like, simultaneously, the phenomena of the reduction of the binding power caused by over-drying of the binder and further the infirm binding when bonding new concrete and old concrete are avoided, and the water solubility is better and the thickening effect is good when the thickener is used for preparing self-compacting concrete through the setting of the thickener, can effectively improve the plastic viscosity of the self-compacting concrete and solve the problems of bleeding and segregation of the self-compacting concrete.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a machine-made sand regulator.
Background
The machine-made sand regulator is a medium-molecular medium-temperature composition, is specially used for machine-made sand concrete, improves the easiness in coating, slump retaining property, water retention property and cohesiveness of the machine-made sand concrete, and prevents the machine-made sand concrete from negative performances such as bleeding and slurry bleeding.
The existing manufacturing process of the machine-made sand regulator is mostly prepared by stirring and mixing various raw materials together, and the energy denaturation for changing functions under different use conditions is lacked. Therefore, there is a need for a machine-made sand conditioner to solve the above problems.
Disclosure of Invention
Technical problem to be solved
In view of the deficiencies of the prior art, the present invention provides a machine-made sand conditioner to solve the above problems.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a machine-made sand regulator comprises the following raw materials in parts by weight: 1-5 parts of a hardening agent, 5-10 parts of a polyester carboxylic acid water reducing agent, 2-10 parts of a binder, 2-10 parts of a thickening agent, 2-10 parts of an additive and 2-10 parts of a dry strength agent.
The invention aims to solve another technical problem of providing a preparation method of a machine-made sand regulator, which comprises the following steps:
(1) and (5) preparing a hardening agent.
(2) And (5) preparing a water reducing agent.
(3) Preparing the drought-strengthening agent.
(4) And (5) preparing a binder.
(5) And (5) preparing an additive.
(6) And (5) preparing a thickening agent.
(7) And (5) preparing an additive.
Preferably, the hardening agent is prepared by mixing one or more of calcium aluminate compounds, colloidal silica, Portland cement and calcium sulphoaluminate with a silica composition in proportion, uniformly stirring in a stirrer, sequentially adding hot water with the water-material ratio of 0.57-1 and the temperature of 65-75 ℃, and rapidly stirring for 2-5 min.
Preferably, the water reducing agent is prepared by feeding polyvinyl alcohol, monomethyl ether and methacrylic acid in proportion, dropwise adding an initiator in an environment of 65-90 ℃, reacting for 0.5-3 hours under heat preservation after dropwise adding, and then adjusting the pH value of the mixed solution by using a sodium hydroxide solution.
Preferably, the dry strength agent is prepared by uniformly mixing the water reducing agent, the early strength component and water in proportion to obtain the concrete early strength agent.
Preferably, the preparation of the binder is that epoxy resin, coal tar, acetone, furfural and curing agent are put into a reaction kettle at normal temperature, slowly heated to 80-90 ℃ for polycondensation reaction, cooled to 30-40 ℃ after the reaction is finished, and discharged.
Preferably, the additive is prepared by taking a calcium hydroxide crystallization inhibitor and an ettringite crystallization inhibitor which account for 0.25-3.35 percent of the mass of the concrete, preparing a solution with the concentration of 1-10 wt percent, and then adjusting the pH value to 7.0-7.5.
Preferably, the thickener is prepared by weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid according to a proportion to prepare an aqueous solution, adjusting the pH value to 6.5-7.0, adding a prepared monomer acrylamide solution with the concentration of 25% -35% while stirring, pouring into a flask after uniformly stirring, introducing nitrogen into a constant-temperature water bath for protection, adding an initiator dropwise when the reaction temperature rises to 30-40 ℃, keeping the temperature at 40 ℃, stirring for reaction for about 1.5-2 hours, stopping introducing nitrogen when the reactant is a viscous liquid, and curing at constant temperature for a period of time to obtain a white transparent colloid, namely the thickener.
Preferably, the additive is prepared by mixing the hardening agent, the water reducing agent, the drought strength agent, the binder, the additive and the thickening agent, heating at 80-90 ℃, and stirring for 3-5 hours.
(III) advantageous effects
Compared with the prior art, the invention provides a machine-made sand regulator, which has the following beneficial effects:
1. the machine-made sand regulator can be freely prepared by a user according to requirements by separately preparing and combining a plurality of regulators, so that the machine-made sand regulator adapting to the environment is prepared, and has good adaptability and performance modification.
2. This mechanism sand regulator, through the setting of binder, add materials such as coal tar, furfural and curing agent in epoxy, avoided making the concrete binder can lead to whole concrete binder to become dry and lead to the reduction of its caking property at cement time reason drying back because of adding cement to avoided phenomenon such as concrete to fall sediment, when bonding new concrete and old concrete simultaneously, also be so that lead to the caking property to reduce because of the binder overdry, and then made the bonding insecure.
3. This mechanism sand regulator, through the setting of thickener, when being used for preparing self-compaction concrete, its water-solubility is better, and thickening effect is good, can effectively improve the plastic viscosity of self-compaction concrete, solves the bleeding of self-compaction concrete and the problem of segregation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a machine-made sand regulator comprises the following raw materials in parts by weight: 1 part of hardening agent, 5 parts of polyester carboxylic acid water reducing agent, 2 parts of binder, 2 parts of thickening agent, 2 parts of additive and 2 parts of dry strength agent.
A preparation method of a machine-made sand regulator comprises the following steps:
(1) preparing a hardening agent: the hardening agent for the fast-hardening concrete which is delivered in a premixed concrete mode is prepared by mixing one or more of calcium aluminate compounds, colloidal silicon dioxide, Portland cement and calcium sulphoaluminate with silicon dioxide according to a proportion, uniformly stirring in a stirrer, sequentially adding hot water with the water-material ratio of 0.57 and the temperature of 65 ℃, and quickly stirring for 2 min.
(2) Preparing a water reducing agent: feeding polyvinyl alcohol, monomethyl ether and methacrylic acid in proportion, dropwise adding an initiator in an environment of 65 ℃, reacting for 0.5 hour under a heat preservation condition after dropwise adding, and then adjusting the pH value of the mixed solution by using a sodium hydroxide solution to obtain the water reducer.
(3) Manufacturing a drought strength agent: and uniformly mixing the water reducing agent, the early strength component and water in proportion to obtain the concrete early strength agent.
(4) Preparing a binder: the epoxy resin, the coal tar, the acetone, the furfural and the curing agent are put into a reaction kettle at normal temperature, the mixture is slowly heated to 80 ℃ and then subjected to polycondensation reaction, the mixture is cooled to 30 ℃ after the reaction is finished and then discharged, materials such as the coal tar, the furfural and the curing agent are added into the epoxy resin, the phenomenon that the whole concrete binder is dried and the binding power of the concrete binder is reduced due to the fact that cement is added to enable the concrete binder to be dried along with time is avoided, the phenomena of slag falling of concrete and the like are avoided, meanwhile, when new concrete and old concrete are bound, the binding power is not reduced due to the fact that the binder is too dry, and further the binding is not firm.
(5) Preparing an additive: the calcium hydroxide crystallization inhibitor and the ettringite crystallization inhibitor account for 0.25 percent of the mass of the concrete and are prepared into a solution with the concentration of 1 weight percent, and then the pH value is adjusted to 7.0, so that the additive can effectively improve the durability of the steam-cured concrete member.
(6) Preparing a thickening agent: weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid according to a proportion to prepare an aqueous solution, adjusting the pH value to 6.5, adding a prepared monomer acrylamide solution with the concentration of 25 percent while stirring, pouring the solution into a flask after uniformly stirring, introducing nitrogen for protection in a constant-temperature water bath, adding an initiator dropwise when the reaction temperature rises to 30 ℃, keeping the temperature at 40 ℃, stirring for about 1.5 hours, stopping introducing nitrogen when a reactant is viscous liquid, and curing at constant temperature for a period of time to obtain a white transparent colloid, namely a thickening agent.
(7) The hardener, the water reducing agent, the dry strength agent, the binder, the additive and the thickening agent are mixed and heated at the temperature of 80 ℃ and stirred for 3 hours to prepare the additive.
Example two: a machine-made sand regulator comprises the following raw materials in parts by weight: 5 parts of a hardening agent, 10 parts of a polyester carboxylic acid water reducing agent, 10 parts of a binder, 10 parts of a thickening agent, 10 parts of an additive and 10 parts of a dry strength agent.
A preparation method of a machine-made sand regulator comprises the following steps:
(1) preparing a hardening agent: the hardening agent for the fast-hardening concrete delivered in the premixed concrete mode is prepared by mixing one or more of calcium aluminate compounds, colloidal silicon dioxide, Portland cement and calcium sulphoaluminate with silicon dioxide in proportion, uniformly stirring in a stirrer, sequentially adding hot water with the water-material ratio of 1 and the temperature of 75 ℃, and quickly stirring for 5 min.
(2) Preparing a water reducing agent: feeding polyvinyl alcohol, monomethyl ether and methacrylic acid in proportion, dropwise adding an initiator in an environment of 90 ℃, keeping the temperature for reaction for 3 hours after dropwise adding, and then adjusting the pH value of the mixed solution by using a sodium hydroxide solution to obtain the water reducing agent.
(3) Manufacturing a drought strength agent: and uniformly mixing the water reducing agent, the early strength component and water in proportion to obtain the concrete early strength agent.
(4) Preparing a binder: the epoxy resin, the coal tar, the acetone, the furfural and the curing agent are put into a reaction kettle at normal temperature, the polycondensation reaction is carried out after the epoxy resin, the epoxy resin is slowly heated to 90 ℃, the epoxy resin is cooled to 40 ℃ after the reaction is finished, and the epoxy resin is added with the coal tar, the furfural, the curing agent and other materials, so that the phenomenon that the whole concrete binder is dried and the binding power of the concrete binder is reduced due to the fact that cement is added to enable the concrete binder to be dried along with time is avoided, the phenomena that the concrete is subjected to slag falling and the like are avoided, meanwhile, when new concrete and old concrete are bound, the binding power is not reduced due to the fact that the binder is too dry, and further the binding is not firm.
(5) Preparing an additive: the calcium hydroxide crystallization inhibitor and the ettringite crystallization inhibitor account for 3.35 percent of the mass of the concrete and are prepared into a solution with the concentration of 10 weight percent, and then the pH value is adjusted to 7.5, so that the additive can effectively improve the durability of the steam-cured concrete member.
(6) Preparing a thickening agent: weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid according to a proportion to prepare an aqueous solution, adjusting the pH value to 7.0, adding a prepared monomer acrylamide solution with the concentration of 28% while stirring, pouring the solution into a flask after uniformly stirring, introducing nitrogen for protection in a constant-temperature water bath, adding an initiator dropwise when the reaction temperature rises to 40 ℃, keeping the temperature at 40 ℃, stirring for reacting for about 2 hours, stopping introducing nitrogen when a reactant is viscous liquid, and curing at constant temperature for a period of time to obtain a white transparent colloid, namely a thickening agent, wherein the thickening agent is used for preparing self-compacting concrete.
(7) Preparing an additive: the hardener, the water reducing agent, the dry strength agent, the binder, the additive and the thickening agent are mixed and heated at the temperature of 90 ℃ and stirred for 5 hours to prepare the additive.
Example three: a machine-made sand regulator comprises the following raw materials in parts by weight: 3 parts of a hardening agent, 7 parts of a polyester carboxylic acid water reducing agent, 5 parts of a binder, 5 parts of a thickening agent, 5 parts of an additive and 5 parts of a dry strength agent.
A preparation method of a machine-made sand regulator comprises the following steps:
(1) preparing a hardening agent: the hardening agent for the fast-hardening concrete which is delivered in a premixed concrete mode is prepared by mixing one or more of calcium aluminate compounds, colloidal silicon dioxide, Portland cement and calcium sulphoaluminate with silicon dioxide according to a proportion, uniformly stirring in a stirrer, sequentially adding 70 ℃ hot water with a water-material ratio of 0.8, and quickly stirring for 3 min.
(2) Preparing a water reducing agent: feeding polyvinyl alcohol, monomethyl ether and methacrylic acid in proportion, dropwise adding an initiator in an environment of 80 ℃, reacting for 2 hours under a heat preservation condition after dropwise adding, and then adjusting the pH value of the mixed solution by using a sodium hydroxide solution to obtain the water reducing agent.
(3) Manufacturing a drought strength agent: and uniformly mixing the water reducing agent, the early strength component and water in proportion to obtain the concrete early strength agent.
(4) Preparing a binder: the epoxy resin, the coal tar, the acetone, the furfural and the curing agent are put into a reaction kettle at normal temperature, the polycondensation reaction is carried out after the epoxy resin, the epoxy resin is slowly heated to 85 ℃, the epoxy resin is cooled to 35 ℃ after the reaction is finished, and then the epoxy resin is discharged, materials such as the coal tar, the furfural, the curing agent and the like are added into the epoxy resin, so that the phenomenon that the whole concrete binder is dried and the binding power of the concrete binder is reduced after the cement is dried along with time is avoided, the phenomena such as concrete slag falling and the like are avoided, meanwhile, when new concrete and old concrete are bound, the binding power is not reduced due to the overdrying of the binder, and further the binding is not firm.
(5) Preparing an additive: the calcium hydroxide crystallization inhibitor and the ettringite crystallization inhibitor are taken to account for 0.3 percent of the mass of the concrete and prepared into a solution with the concentration of 5 weight percent, and then the pH value is adjusted to 7.2, so that the additive can effectively improve the durability of the steam-cured concrete member.
(6) Preparing a thickening agent: weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid according to a proportion to prepare an aqueous solution, adjusting the pH value to 6.7, adding a prepared monomer acrylamide solution with the concentration of 30% while stirring, pouring the solution into a flask after uniformly stirring, introducing nitrogen for protection in a constant-temperature water bath, adding an initiator dropwise when the reaction temperature rises to 35 ℃, keeping the temperature at 40 ℃, stirring for reaction for about 1.7 hours, stopping introducing nitrogen when a reactant is viscous liquid, and curing at constant temperature for a period of time to obtain a white transparent colloid, namely a thickening agent.
(7) The hardener, the water reducing agent, the dry strength agent, the binder, the additive and the thickening agent are mixed and heated at the temperature of 85 ℃ and stirred for 4 hours to prepare the additive.
Example four: a machine-made sand regulator comprises the following raw materials in parts by weight: 2 parts of a hardening agent, 6 parts of a polyester carboxylic acid water reducing agent, 3 parts of a binder, 5 parts of a thickening agent, 4 parts of an additive and 6 parts of a dry strength agent.
A preparation method of a machine-made sand regulator comprises the following steps:
(1) preparing a hardening agent: the hardening agent for the fast-hardening concrete which is delivered in a premixed concrete mode is prepared by mixing one or more of calcium aluminate compounds, colloidal silicon dioxide, Portland cement and calcium sulphoaluminate with silicon dioxide according to a proportion, uniformly stirring in a stirrer, sequentially adding hot water with the water-material ratio of 0.7 and the temperature of 69 ℃, and quickly stirring for 5 min.
(2) Preparing a water reducing agent: feeding polyvinyl alcohol, monomethyl ether and methacrylic acid in proportion, dropwise adding an initiator in an environment of 70 ℃, reacting for 2.5 hours under a heat preservation condition after dropwise adding, and then adjusting the pH value of the mixed solution by using a sodium hydroxide solution to obtain the water reducing agent.
(3) Manufacturing a drought strength agent: and uniformly mixing the water reducing agent, the early strength component and water in proportion to obtain the concrete early strength agent.
(4) Preparing a binder: the epoxy resin, the coal tar, the acetone, the furfural and the curing agent are put into a reaction kettle at normal temperature, the polycondensation reaction is carried out after the epoxy resin, the epoxy resin is slowly heated to 88 ℃, the reaction product is cooled to 32 ℃ and then discharged, materials such as the coal tar, the furfural and the curing agent are added into the epoxy resin, the phenomenon that the whole concrete binder is dried and the binding power of the concrete binder is reduced due to the fact that cement is added to enable the concrete binder to be dried along with time is avoided, the phenomena that the concrete is subjected to slag falling and the like are avoided, meanwhile, when new concrete and old concrete are bound, the binding power is not reduced due to the fact that the binder is too dry, and further the binding is not firm.
(5) Preparing an additive: the calcium hydroxide crystallization inhibitor and the ettringite crystallization inhibitor are taken to account for 3 percent of the mass of the concrete and prepared into a solution with the concentration of 3 weight percent, and then the pH value is adjusted to 7.1, so that the additive can effectively improve the durability of the steam-cured concrete member.
(6) Preparing a thickening agent: weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid according to a proportion to prepare an aqueous solution, adjusting the pH value to 6.6, adding a prepared monomer acrylamide solution with the concentration of 28% while stirring, pouring the solution into a flask after uniformly stirring, introducing nitrogen for protection in a constant-temperature water bath, adding an initiator dropwise when the reaction temperature rises to 33 ℃, keeping the temperature at 40 ℃, stirring for reaction for about 1.7 hours, stopping introducing nitrogen when a reactant is viscous liquid, and curing at constant temperature for a period of time to obtain a white transparent colloid, namely a thickening agent.
(7) The hardener, the water reducing agent, the dry strength agent, the binder, the additive and the thickening agent are mixed and heated at 88 ℃ and stirred for 4 hours to prepare the additive.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A machine-made sand regulator is characterized in that: the material comprises the following raw materials in parts by weight: 1-5 parts of a hardening agent, 5-10 parts of a polyester carboxylic acid water reducing agent, 2-10 parts of a binder, 2-10 parts of a thickening agent, 2-10 parts of an additive and 2-10 parts of a dry strength agent.
2. A machine-made sand conditioning agent is characterized by comprising the following steps:
(1) preparing a hardening agent;
(2) preparing a water reducing agent;
(3) preparing a drought strength agent;
(4) preparing a binder;
(5) preparing an additive;
(6) preparing a thickening agent;
(7) and (5) preparing an additive.
3. The machine-made sand conditioner of claim 2, wherein: the hardening agent is prepared by mixing one or more of calcium aluminate compounds, colloidal silica, Portland cement and calcium sulphoaluminate with silica in proportion, stirring uniformly in a stirrer, sequentially adding hot water with water-material ratio of 0.57-1 at 65-75 ℃, and rapidly stirring for 2-5 min.
4. The machine-made sand conditioner of claim 3, wherein: the water reducer is prepared by feeding polyvinyl alcohol, monomethyl ether and methacrylic acid in proportion, dropwise adding an initiator in an environment of 65-90 ℃, reacting for 0.5-3 hours at a constant temperature after dropwise adding, and then adjusting the pH value of a mixed solution by using a sodium hydroxide solution.
5. The machine-made sand conditioner of claim 4, wherein: the dry strength agent is prepared by uniformly mixing the water reducing agent, the early strength component and water in proportion to obtain the concrete early strength agent.
6. The machine-made sand conditioner of claim 5, wherein: the preparation of the adhesive is that epoxy resin, coal tar, acetone, furfural and curing agent are put into a reaction kettle at normal temperature, polycondensation reaction is carried out after the epoxy resin, the coal tar, the acetone, the furfural and the curing agent are slowly heated to 80-90 ℃, and the epoxy resin, the coal tar, the acetone, the furfural and the curing agent are cooled to 30-40 ℃ after the reaction is finished and then discharged.
7. The machine-made sand conditioner of claim 6, wherein: the additive is prepared by taking a calcium hydroxide crystallization inhibitor and an ettringite crystallization inhibitor which account for 0.25-3.35% of the mass of concrete, preparing a solution with the concentration of 1-10 wt%, and then adjusting the pH value to 7.0-7.5.
8. The machine-made sand conditioner of claim 7, wherein: the preparation method of the thickening agent comprises the steps of weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid according to a proportion to prepare an aqueous solution, adjusting the pH value to 6.5-7.0, adding a prepared monomer acrylamide solution with the concentration of 25% -35% while stirring, pouring the mixture into a flask after uniformly stirring, introducing nitrogen into a constant-temperature water bath for protection, adding an initiator dropwise when the reaction temperature rises to 30-40 ℃, keeping the temperature at 40 ℃, stirring for reaction for about 1.5-2 hours, stopping introducing nitrogen when a reactant is a viscous liquid, and curing at constant temperature for a period of time to obtain a white transparent colloid, namely the thickening agent.
9. The machine-made sand conditioner of claim 8, wherein: the additive is prepared by mixing and heating a hardening agent, a water reducing agent, a drought strength agent, a binder, an additive and a thickening agent at the temperature of 80-90 ℃ and stirring for 3-5 hours.
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| CN113683353A (en) * | 2021-09-11 | 2021-11-23 | 杭州三中新型建材科技有限公司 | Ultrahigh pumping concrete applying machine-made sand and preparation method thereof |
| CN115947560A (en) * | 2023-03-13 | 2023-04-11 | 石家庄市长安育才建材有限公司 | Additive for improving concrete workability and preparation method thereof |
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| CN112794675A (en) * | 2021-01-13 | 2021-05-14 | 杭州申华混凝土有限公司 | Machine-made sand regulator and using method thereof |
| CN113683353A (en) * | 2021-09-11 | 2021-11-23 | 杭州三中新型建材科技有限公司 | Ultrahigh pumping concrete applying machine-made sand and preparation method thereof |
| CN113683353B (en) * | 2021-09-11 | 2022-06-17 | 杭州三中新型建材科技有限公司 | Ultrahigh pumping concrete applying machine-made sand and preparation method thereof |
| CN115947560A (en) * | 2023-03-13 | 2023-04-11 | 石家庄市长安育才建材有限公司 | Additive for improving concrete workability and preparation method thereof |
| CN115947560B (en) * | 2023-03-13 | 2023-08-04 | 石家庄市长安育才建材有限公司 | Additive for improving workability of concrete and preparation method thereof |
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Application publication date: 20200403 |