CN113563776B - Concrete plasticity stage curing agent with reinforcing function and preparation method thereof - Google Patents

Concrete plasticity stage curing agent with reinforcing function and preparation method thereof Download PDF

Info

Publication number
CN113563776B
CN113563776B CN202110849270.XA CN202110849270A CN113563776B CN 113563776 B CN113563776 B CN 113563776B CN 202110849270 A CN202110849270 A CN 202110849270A CN 113563776 B CN113563776 B CN 113563776B
Authority
CN
China
Prior art keywords
water
curing agent
percent
molecular polymer
high molecular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110849270.XA
Other languages
Chinese (zh)
Other versions
CN113563776A (en
Inventor
邹小平
何子杨
刘成舟
柴天红
习海平
易鹏
揭晓东
吴少华
彭诗杨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangxi Building Materials Research And Design Institute Co ltd
Original Assignee
Jiangxi Building Materials Research And Design Institute Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangxi Building Materials Research And Design Institute Co ltd filed Critical Jiangxi Building Materials Research And Design Institute Co ltd
Priority to CN202110849270.XA priority Critical patent/CN113563776B/en
Publication of CN113563776A publication Critical patent/CN113563776A/en
Application granted granted Critical
Publication of CN113563776B publication Critical patent/CN113563776B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D143/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
    • C09D143/02—Homopolymers or copolymers of monomers containing phosphorus
    • 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
    • C04B40/04—Preventing evaporation of the mixing water
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a concrete plasticity stage curing agent with a reinforcing function, which comprises 20 to 30 weight percent of high molecular polymer, 1~8 weight percent of lithium silicate, 0.02 to 0.5 weight percent of acetylenic diol, 1 to 2.5 weight percent of polycarboxylic acid water reducing agent, 0.5 to 4 weight percent of auxiliary agent, 1.5 to 10 weight percent of modified soybean lecithin, 1~6 weight percent of melissol, 0.5 to 5 weight percent of polyglycerol-10 polyricinoleate, 0.5 to 3 weight percent of mono-fatty acid glyceride and the balance of water; the high molecular polymer is further prepared from the following raw materials in percentage by weight: 5-25% of acrylic acid, 5-20% of vinyl-2-pyrrolidone, 1-5% of methacryloyloxyethyl phosphorylcholine, 0.5-1% of N, N-methylenebisacrylamide, 0.1-0.5% of an initiator and the balance of water. The curing agent can effectively reduce water evaporation, effectively inhibit cracking in a plastic stage, and can obtain the effect of improving strength besides better plastic stage curing.

Description

Concrete plasticity stage curing agent with reinforcing function and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a concrete plasticity stage curing agent with a reinforcing function and a preparation method thereof.
Background
The rapid evaporation of water in the concrete plasticity stage can enable the concrete to generate shrinkage stress, the concrete tensile strength in the plasticity stage is extremely low, the concrete is easy to crack, and then a channel is provided for external harmful substances to invade the interior of the concrete structure, so that the structural durability is influenced. Therefore, the curing of the concrete in the plastic stage plays a crucial role in the safety of the concrete.
Most scholars agree that the mechanism of concrete plastic stage cracking is that the concrete surface dries gradually so that the water and air interfaces between solid particles form a capillary meniscus, creating a capillary negative pressure, and the particles separated by the capillary water are attracted to each other by the surface tension, and in fresh concrete all solid particles are moving relative to each other, so that the surface tension reduces the average distance between the particles, thereby creating plastic shrinkage, and when the surface tension exceeds the tensile strength of fresh concrete, plastic shrinkage cracks are created.
Concrete curing methods are many, and the basic principle is to keep the concrete at a certain humidity. The traditional curing method mainly comprises the following steps: a cover film, a spray, etc. The types of curing agents currently mainly include four main types: water glass, emulsion, organic solvent and organic-inorganic composite.
(1) Water glass curing agent: the inorganic curing agent in the market has a large proportion, the main components of the inorganic curing agent are silicate and sulfate, the action mechanism of the inorganic curing agent is that the silicate and the sulfate react with calcium hydroxide to produce a cementing material and needle-rod-shaped ettringite, capillary pores are blocked, water evaporation is inhibited, but the water retention rate is low, and the effect is poor in a severe environment.
(2) Emulsion type curing agent: the emulsion curing agent mainly comprises paraffin emulsion, asphalt emulsion and high polymer emulsion (mainly acrylic acid series high polymer emulsion), and is prepared by emulsifying paraffin, asphalt and high polymer resin by adding an emulsifier and other auxiliaries. The main action mechanism is that after the water in the emulsion is evaporated, the emulsion particles gather to form a film with low moisture permeability, and the film can be effectively attached to the surface of the concrete, so that the water on the surface of the concrete is effectively prevented from being evaporated. Under the condition that free water exists on the surface of concrete, the paraffin emulsion is easily diluted into emulsion with low viscosity by the water on the surface of the concrete, and the diluted paraffin emulsion can be absorbed along with the coagulation of the concrete, so that the formation of a paraffin curing film is damaged, the coagulation and crystallization of a cement hydration product are influenced, and the abrasion resistance and the strength of the surface of the concrete are greatly reduced.
(3) Organic solvents: if perchloroethylene resin solution is adopted, materials such as resin are dissolved by organic solvent to form the concrete surface layer, the curing mechanism is similar to emulsion, resin particles in the solution are gathered into a film by drying after the solvent is volatilized, and the formed organic film can prevent the water of the concrete surface layer from evaporating. The advantages of high water retention rate and the disadvantages: the price is higher, and the organic solvent is contained, so the method is unsafe and harmful to human bodies. After the coating is sprayed on a concrete surface layer, some harmful substances enter the concrete surface layer to generate adverse effects, so that the strength of the concrete is damaged.
(4) Organic-inorganic composite curing agent: the organic-inorganic composite curing agent is prepared by effectively compounding an inorganic densification material and an organic film-forming material, such as compounding water glass with paraffin emulsion and compounding water glass with polymer emulsion, wherein the performance of the compounded curing agent is effectively improved. The main action mechanism of the organic-inorganic composite curing agent is as follows: the organic components form a continuous soft film through self-polymerization and air oxidation and adhere to the surface of the concrete, so that the water evaporation on the surface of the concrete is reduced, meanwhile, the inorganic components can permeate into capillary pores of the surface concrete and generate chemical reaction to form a colloid substance, and the colloid substance can effectively fill the capillary pores, so that the water evaporation is reduced. Compared with other curing agents, the organic-inorganic composite curing agent has good water retention performance due to the dual curing effect, and the water retention rate can be more than 80%, so that the performance of curing concrete can be effectively improved. Inorganic-organic composites are the development direction of future curing agents.
Generally, the curing agent has poor effect, high cost, poor stability, unfavorable strength and the like, and is combined with organic and inorganic composite curing agents as development trend and advantages, so that the curing agent with the reinforcing function is necessary to be developed, and not only can play a role in curing, but also can improve the strength of concrete.
Disclosure of Invention
The invention aims to provide a concrete plastic stage curing agent with a reinforcing function and a preparation method thereof.
The above object of the present invention is achieved by the following technical solutions:
the concrete plasticity stage curing agent with the reinforcing function comprises, by weight, 20 to 30% of a high polymer, 1~8% of lithium silicate, 0.02 to 0.5% of alkynediol, 1 to 2.5% of a polycarboxylic acid water reducing agent, 0.5 to 4% of an auxiliary agent, 1.5 to 10% of modified soybean phospholipid, 1~6% of myricyl alcohol, 0.5 to 5% of polyglycerol-10 polyricinoleate, 0.5 to 3% of mono-fatty acid glyceride and the balance of water.
The high molecular polymer is preferably prepared from the following raw materials in percentage by weight: 5-25% of acrylic acid, 5-20% of vinyl-2-pyrrolidone, 1-5% of methacryloyloxyethyl phosphorylcholine, 0.5-1% of N, N-methylenebisacrylamide, 0.1-0.5% of an initiator and the balance of water.
More preferably, the high molecular polymer is obtained by polymerizing:
(1) Dissolving acrylic acid, vinyl-2-pyrrolidone and methacryloyloxyethyl phosphorylcholine in water according to the proportion, stirring and heating to 50-80 ℃, then adding N, N-methylene bisacrylamide, and stirring at constant temperature for 5-15 minutes;
(2) Adding an initiator, keeping the temperature and stirring at a high speed for 2~6 hours, and then naturally cooling to room temperature;
(3) Then adjusting the pH value of the solution to 5~7 to obtain the high molecular polymer solution.
The molecular weight of a high molecular polymer in the curing agent is 50000-80000, and the main structure of the curing agent is shown as the following formula (I):
Figure 882061DEST_PATH_IMAGE001
（I）
wherein the values of m and L are 10 to 20, the values of X are 400 to 600, the values of Y are 100 to 200, and the values of Z are 5 to 10, and are integers.
The alkyne diol is any one or a mixture of more than two of ethoxylated alkyne diol, alkoxy alkyne diol or dimethyl hexyne diol, and is used for reducing dynamic surface tension in an aqueous system.
The polycarboxylate superplasticizer disclosed by the invention is a polyether polycarboxylate superplasticizer, the solid content is not lower than 20%, and the water reduction rate is not lower than 25%.
The auxiliary agent is at least one of nekal, tween 80 or isomeric alcohol, and can obviously reduce the interfacial tension of the system.
On the basis, the invention also provides a preparation method of the concrete plastic stage curing agent with the reinforcing function, which comprises the following steps:
(1) Preparing a polymer raw material composition according to the following weight percentage: 5-25% of acrylic acid, 5-20% of vinyl-2-pyrrolidone, 1-5% of methacryloyloxyethyl phosphorylcholine, 0.5-1% of N, N-methylenebisacrylamide, 0.1-0.5% of an initiator and the balance of water;
(2) Dissolving the acrylic acid, the vinyl-2-pyrrolidone and the methacryloyloxyethyl phosphorylcholine in the proportion in the step (1) in water, and stirring and heating to 50-80 ℃; then adding the N, N-methylene bisacrylamide in the proportion and stirring for 5 to 15 minutes at constant temperature; further adding the initiator in the proportion, keeping the temperature, stirring at a high speed for 2~6 hours, and naturally cooling to room temperature; neutralizing the solution to pH =5~7 to obtain a high molecular polymer solution;
(3) Preparing a raw material composition of the curing agent according to the following components in percentage by weight: (2) 20 to 30 percent of the obtained high polymer, 3238 percent of lithium silicate, 3238 percent of zxft, 0.02 to 0.5 percent of alkynediol, 1 to 2.5 percent of polycarboxylic acid water reducing agent, 0.5 to 4 percent of auxiliary agent, 1.5 to 10 percent of modified soybean phospholipid, 3262 percent of myricyl alcohol, 3262 percent of polyglycerol-10 polyricinoleate, 0.5 to 5 percent of mono-fatty acid glyceride and 0.5 to 3 percent of water in balance;
(4) Adding water, lithium silicate, alkynediol, a polycarboxylic acid water reducing agent and an auxiliary agent into the high molecular polymer solution obtained in the step (2) according to the proportion in the step (3), and stirring for 30 to 45min; and then adding modified soybean phospholipid, myricyl alcohol, polyglycerol-10 polyricinoleate and mono-fatty acid glyceride and di-fatty acid glyceride, and stirring uniformly at the stirring speed of 600 r/min-1200 r/min to obtain the concrete plasticity stage curing agent with the reinforcing function.
The beneficial effects of the invention are: the preparation process is simple and feasible, and the finished product is nontoxic and pollution-free; the high molecular polymer is prepared by adopting special functional monomers under certain process conditions, has the characteristics of excellent easy film forming property and high water retention property, can improve the adhesive property of a molecular film and the surface of concrete, and is combined with substances such as myricyl alcohol and the like to obtain better maintenance effect. On the other hand, by adding the auxiliary agent and the alkynediol, the interfacial tension of the concrete component materials in the plastic stage can be reduced, the lithium silicate can be quickly permeated into the concrete and can perform secondary reaction with a byproduct of cement hydration in the concrete, a large amount of hydration products are generated, and the strength of the concrete is improved. Therefore, the curing agent can effectively reduce water evaporation, effectively inhibit plastic stage cracking, and can obtain the effect of improving strength besides better plastic stage curing.
When the curing agent is used, the curing agent needs to be diluted by 10 times by water, the curing agent is sprayed as soon as possible under the conditions that the surface of concrete is free from clear water and the surface is smooth, and the spraying amount is 3-5m 2 /kg。
Detailed Description
The present invention will be described in more detail with reference to specific examples. Unless otherwise specified, the components in each of the following examples are in percentages of the same mass unit.
Example 1
The concrete plasticity stage curing agent with the reinforcing function comprises, by weight, 25% of a high-molecular polymer, 2.5% of lithium silicate, 0.1% of alkynediol, 1.5% of a polycarboxylic acid water reducing agent, 1.2% of an auxiliary agent, 4% of modified soybean phospholipid, 2.3% of melissol, 2% of polyglycerol-10 polyricinoleate, 0.8% of mono-fatty acid glyceride and the balance of water. The alkynediol is dimethylhexynediol. The polycarboxylate superplasticizer is a polyether polycarboxylate superplasticizer, and has a solid content of 23% and a water reduction rate of 28%. The auxiliary agent is nekal.
The high molecular polymer is prepared from the following raw materials in percentage by weight: 16 percent of acrylic acid, 10 percent of vinyl-2-pyrrolidone, 1.2 percent of methacryloyloxyethyl phosphorylcholine, 0.8 percent of N, N-methylene bisacrylamide, 0.3 percent of initiator and the balance of water. The preparation method of the high molecular polymer comprises the following steps:
(1) The acrylic acid, the vinyl-2-pyrrolidone and the methacryloyloxyethyl phosphorylcholine in the proportion are dissolved in water and stirred to be heated to 65 ℃.
(2) After the temperature reaches a set value, adding N, N-methylene-bisacrylamide, and stirring for 10 minutes at constant temperature.
(3) Adding an initiator, keeping the temperature and stirring at a high speed for 3 hours, and then naturally cooling to room temperature.
(4) Adding a proper amount of alkali, stirring and neutralizing the solution until the pH is =5~7 to obtain the high molecular polymer solution.
The preparation method of the concrete plastic stage curing agent with the reinforcing function in the embodiment comprises the following steps:
according to the component proportion of the curing agent in this embodiment, adding corresponding amounts of water, lithium silicate, alkynediol, polycarboxylic acid water reducer, and auxiliary agent to the high molecular polymer solution prepared by the above method, and stirring for 40min; and then adding corresponding amounts of modified soybean phospholipid, myricyl alcohol, polyglycerol-10 polyricinoleate and mono-fatty acid glyceride and di-fatty acid glyceride, and stirring at a stirring speed of 600 r/min-1200 r/min until the mixture is uniform, thus obtaining the concrete plasticity stage curing agent with the enhancement function.
Example 2
The concrete plasticity stage curing agent with the reinforcing function comprises, by weight, 23% of a high polymer, 3% of lithium silicate, 0.05% of alkynediol, 2% of a polycarboxylic acid water reducing agent, 2% of an auxiliary agent, 8% of modified soybean phospholipid, 2.5% of melissol, 3% of polyglycerol-10 polyricinoleate, 0.7% of mono-fatty acid glyceride and the balance of water. The alkyne diol is a mixture of ethoxylated alkyne diol and dimethylhexyne diol. The polycarboxylate water reducing agent is a polyether polycarboxylate water reducing agent, the solid content is 23%, and the water reducing rate is 28%. The auxiliary agent is Tween 80.
The high molecular polymer is prepared from the following raw materials in percentage by weight: 18 percent of acrylic acid, 8 percent of vinyl-2-pyrrolidone, 1.0 percent of methacryloyloxyethyl phosphorylcholine, 0.7 percent of N, N-methylene bisacrylamide, 0.4 percent of initiator and the balance of water. The preparation method of the high molecular polymer comprises the following steps:
(1) The acrylic acid, the vinyl-2-pyrrolidone and the methacryloyloxyethyl phosphorylcholine in the proportion are dissolved in water and stirred to be heated to 65 ℃.
(2) After the temperature reaches a set value, adding N, N-methylene bisacrylamide, and stirring for 10 minutes at constant temperature.
(3) Adding an initiator, keeping the temperature and stirring at a high speed for 3 hours, and then naturally cooling to room temperature.
(4) Adding a proper amount of alkali, stirring and neutralizing the solution until the pH is =5~7 to obtain the high molecular polymer solution.
The preparation method of the concrete plastic stage curing agent with the reinforcing function in the embodiment comprises the following steps:
according to the component proportion of the curing agent in the embodiment, water, lithium silicate, alkynediol, polycarboxylic acid water reducing agent and auxiliary agent with corresponding amount are sequentially added into the high molecular polymer solution prepared by the method, and the mixture is stirred for 40min; and then adding corresponding amounts of modified soybean phospholipid, myricyl alcohol, polyglycerol-10 polyricinoleate and mono-fatty acid glyceride and di-fatty acid glyceride, and stirring at a stirring speed of 600 r/min-1200 r/min until the mixture is uniform, thus obtaining the concrete plasticity stage curing agent with the enhancement function.
Example 3
The concrete plasticity stage curing agent with the enhancement function comprises, by weight, 22% of high-molecular polymer, 2% of lithium silicate, 0.08% of alkynediol, 1.8% of polycarboxylic acid water reducing agent, 1.5% of auxiliary agent, 6% of modified soybean phospholipid, 2% of melissyl alcohol, 2.5% of polyglycerol-10 polyricinoleate, 1% of mono-fatty acid glyceride and 1% of di-fatty acid glyceride, and the balance of water. The alkyne diol is alkoxy alkyne diol. The polycarboxylate water reducing agent is a polyether polycarboxylate water reducing agent, the solid content is 23%, and the water reducing rate is 28%. The auxiliary agent is a mixture of Tween 80 and isomeric alcohol.
The high molecular polymer is prepared from the following raw materials in percentage by weight: 18 percent of acrylic acid, 8 percent of vinyl-2-pyrrolidone, 1.0 percent of methacryloyloxyethyl phosphorylcholine, 0.7 percent of N, N-methylene bisacrylamide, 0.4 percent of initiator and the balance of water. The preparation method of the high molecular polymer comprises the following steps:
(1) The acrylic acid, the vinyl-2-pyrrolidone and the methacryloyloxyethyl phosphorylcholine with the proportion are dissolved in water and stirred to be heated to 65 ℃.
(2) After the temperature reaches a set value, adding N, N-methylene bisacrylamide, and stirring for 10 minutes at constant temperature.
(3) Adding an initiator, keeping the temperature, stirring at a high speed for 3 hours, and then naturally cooling to room temperature.
(4) And adding a proper amount of alkali, stirring and neutralizing the solution until the pH is =5~7 to obtain the high molecular polymer solution.
The preparation method of the concrete plastic stage curing agent with the reinforcing function in the embodiment comprises the following steps:
according to the component proportion of the curing agent in the embodiment, water, lithium silicate, alkynediol, polycarboxylic acid water reducing agent and auxiliary agent with corresponding amount are sequentially added into the high molecular polymer solution prepared by the method, and the mixture is stirred for 40min; and adding corresponding amounts of modified soybean phospholipid, myricyl alcohol, polyglycerol-10 polyricinoleate and mono-fatty acid glyceride and di-fatty acid glyceride, and stirring at a stirring speed of 600 r/min-1200 r/min until the mixture is uniform, thereby obtaining the concrete plasticity stage curing agent with the enhancement function.
Example 4
The concrete plasticity stage curing agent with the enhancement function comprises, by weight, 22% of high-molecular polymer, 2% of lithium silicate, 0.08% of alkynediol, 1.8% of polycarboxylic acid water reducing agent, 1.5% of auxiliary agent, 6% of modified soybean phospholipid, 2% of melissyl alcohol, 2.5% of polyglycerol-10 polyricinoleate, 1% of mono-fatty acid glyceride and 1% of di-fatty acid glyceride, and the balance of water. The alkyne diol is a mixture of ethoxylated alkyne diol and alkoxy alkyne diol. The polycarboxylate superplasticizer is a polyether polycarboxylate superplasticizer, and has a solid content of 23% and a water reduction rate of 28%. The auxiliary agent is isomeric alcohol.
The high molecular polymer is prepared from the following raw materials in percentage by weight: 16 percent of acrylic acid, 10 percent of vinyl-2-pyrrolidone, 1.2 percent of methacryloyloxyethyl phosphorylcholine, 0.8 percent of N, N-methylene bisacrylamide, 0.3 percent of initiator and the balance of water. The preparation method of the high molecular polymer comprises the following steps:
(1) The acrylic acid, the vinyl-2-pyrrolidone and the methacryloyloxyethyl phosphorylcholine in the proportion are dissolved in water and stirred to be heated to 65 ℃.
(2) After the temperature reaches a set value, adding N, N-methylene-bisacrylamide, and stirring for 10 minutes at constant temperature.
(3) Adding an initiator, keeping the temperature and stirring at a high speed for 3 hours, and then naturally cooling to room temperature.
(4) Adding a proper amount of alkali, stirring and neutralizing the solution until the pH is =5~7 to obtain the high molecular polymer solution.
The preparation method of the concrete plastic stage curing agent with the reinforcing function in the embodiment comprises the following steps:
according to the component proportion of the curing agent in the embodiment, water, lithium silicate, alkynediol, polycarboxylic acid water reducing agent and auxiliary agent with corresponding amount are sequentially added into the high molecular polymer solution prepared by the method, and the mixture is stirred for 40min; and then adding corresponding amounts of modified soybean phospholipid, myricyl alcohol, polyglycerol-10 polyricinoleate and mono-fatty acid glyceride and di-fatty acid glyceride, and stirring at a stirring speed of 600 r/min-1200 r/min until the mixture is uniform, thus obtaining the concrete plasticity stage curing agent with the enhancement function.
Comparative example 1
Emulsion-type plastic stage curing agents are commercially available.
Comparative example 2
Inorganic salt plastic stage curing agent is sold in market.
Comparative example 3
A commercial compound plastic stage curing agent.
Comparative example 4
The curing agent comprises, by weight, 22% of a polyvinyl alcohol solution (with a solid content of 2%), 2% of lithium silicate, 0.08% of alkynediol, 1.8% of a polycarboxylic acid water reducing agent, 1.5% of an auxiliary agent, 6% of modified soybean phospholipid, 2% of melissol, 2.5% of polyglycerol-10 polyricinoleate, 1% of mono-fatty acid glyceride and the balance of water. The alkyne diol is a mixture of ethoxylated alkyne diol and alkoxy alkyne diol. The polycarboxylate water reducing agent is a polyether polycarboxylate water reducing agent, the solid content is 23%, and the water reducing rate is 28%. The auxiliary agent is isomeric alcohol.
Application example 1
The concrete plastic stage curing agent with the reinforcing function and the conventional commercial curing agent are measured according to JG/T477-2015 'concrete plastic stage water evaporation inhibitor' on the water evaporation inhibition rate, the 28d compressive strength ratio and the total cracking area reduction rate. The cement paste for testing the water evaporation inhibition rate is formed by mixing reference cement and water, and the water-cement ratio is 0.4; the concrete mixing proportion of the indexes of the compressive strength ratio and the total cracking area reduction rate in the test of 28d is shown in table 1, and the detection result is shown in table 2. When all the curing agents are used, the curing agents need to be diluted by 10 times by water, and the spraying amount of the curing agents is 5m 2 /kg（0.2kg/m 2 ）。
TABLE 1 C30 concrete mixing ratio
Cement Sand Stone Water (W)
330 827 1053 190
TABLE 2 curing agent test results
Number of Water evaporation inhibition rate/%) 28 compressive strength ratio/%) Total area reduction of cracking/%)
Example 1 33.2 112 88.3
Example 2 31.5 109 87.5
Example 3 32.3 114 88.0
Practice ofExample 4 30.6 110 86.3
Comparative example 1 29.8 95 86.1
Comparative example 2 14.3 102 76.6
Comparative example 3 28.5 101 85.4
Comparative example 4 25.7 102 85.1
Application example 2
The concrete plastic stage curing agent with the reinforcing function and the conventional commercial curing agent are measured according to JG/T477-2015 concrete plastic stage water evaporation inhibitor on the water evaporation inhibition rate, 28d compressive strength ratio and total cracking area reduction rate. The cement paste for testing the water evaporation inhibition rate is formed by mixing ordinary portland cement and water, and the water-cement ratio is 0.4; the concrete mixing proportion of the indexes of the compressive strength ratio and the total cracking area reduction rate in the test of 28d is shown in table 3, and the detection result is shown in table 4. When all the curing agents are used, the curing agents need to be diluted by 10 times by water, and the spraying amount of the curing agents is 5m 2 /kg（2kg/m 2 ）。
TABLE 3 C40 concrete mixing ratio
Cement Fly ash Mineral powder Sand Stone (stone) Water reducing agent Water (I)
260 70 80 730 1060 5.7 175
TABLE 4 curing agent test results
Numbering Water evaporation inhibition rate/%) 28 compressive strength ratio/%) Total area reduction of cracking/%)
Example 1 32.1 108 87.1
Example 2 30.8 107 85.7
Example 3 31.4 110 86.5
Example 4 31.7 108 86.8
Comparative example 1 28.8 97 85.6
Comparative example 2 15.8 103 75.3
Comparative example 3 27.6 104 86.2
Comparative example 4 25.1 103 85.8
As can be seen from tables 2 and 4, the curing agent of examples 1 to 4 of the present invention has a good water evaporation inhibition rate, a high compressive strength, and a high reduction rate of the total cracking area, both by adopting the standard method of JG/T477-2015 Water evaporation inhibitor in concrete plasticity stage and by adopting the results of the ordinary concrete mixing ratio test. And the corresponding test results of various proportions representing the conventional curing agents are insufficient. The comparative example 1 used in the test is a commercial emulsion type plastic stage curing agent, the water evaporation inhibition rate and the total cracking area reduction rate are high and meet the standard requirements, but the 28d compressive strength is low and is lower than the standard requirements. The comparative example 2 used in the test is a commercially available inorganic plastic stage curing agent, which has good compressive strength, but has low water evaporation inhibition rate and low total cracking area reduction rate, and does not meet the standard requirements. The comparative example 3 used in the test is a commercial composite plastic stage curing agent, and although the water evaporation inhibition rate, the total cracking area reduction rate and the compressive strength are generally good and can meet the standard requirements, the comparative example is still not ideal. The comparative example 4 used in the test is a curing agent prepared from a conventional high molecular polymer polyvinyl alcohol solution, and the water evaporation inhibition rate, the total cracking area reduction rate and the compressive strength of the curing agent are generally good, and can meet the standard requirements, but the effect of the curing agent is lower than that of the curing agents of the embodiments 1 to 4 of the invention. In summary, the curing agents of examples 1 to 4 of the present invention are significantly improved in the moisture evaporation inhibition rate, compressive strength, total cracking area reduction rate, and the like, as compared with the conventional curing agents commercially available and those prepared from conventional high molecular polymers.
The foregoing is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the invention in any way
Any simple modifications to the above embodiments in accordance with the technical essence of the present invention may be made without departing from the technical scope of the present invention
All changes, equivalents and modifications that come within the spirit of the invention are desired to be protected.

Claims (9)

1. A concrete plasticity stage curing agent with a reinforcing function comprises, by weight, 20 to 30% of a high polymer, 1~8% of lithium silicate, 0.02 to 0.5% of alkynediol, 1 to 2.5% of a polycarboxylic acid water reducing agent, 0.5 to 4% of an auxiliary agent, 1.5 to 10% of modified soybean lecithin, 1~6% of myricyl alcohol, 0.5 to 5% of polyglycerol-10 polyricinoleate, 0.5 to 3% of mono-fatty acid glyceride and the balance of water;
the high molecular polymer is prepared from the following raw materials in percentage by weight: 5-25% of acrylic acid, 5-20% of vinyl-2-pyrrolidone, 1-5% of methacryloyloxyethyl phosphorylcholine, 0.5-1% of N, N-methylenebisacrylamide, 0.1-0.5% of an initiator and the balance of water;
the high molecular polymer is obtained by polymerizing the following steps:
according to the mass percentage of the raw materials of the high molecular polymer, dissolving acrylic acid, vinyl-2-pyrrolidone and methacryloyloxyethyl phosphorylcholine in water, stirring and heating to 50-80 ℃, then adding N, N-methylene bisacrylamide, and stirring at constant temperature for 5-15 minutes; adding an initiator, keeping the temperature and stirring at a high speed for 2~6 hours, and then naturally cooling to room temperature; then adjusting the pH value of the solution to 5~7 to obtain a high molecular polymer solution; the auxiliary agent is at least one of nekal, tween 80 or isomeric alcohol.
2. The curing agent according to claim 1, wherein: the alkyne diol is any one or a mixture of more than two of ethoxylated alkyne diol, alkoxy alkyne diol or dimethyl hexyne diol.
3. The curing agent according to claim 1, wherein: the polycarboxylate superplasticizer is a polyether polycarboxylate superplasticizer, the solid content is not lower than 20%, and the water reducing rate is not lower than 25%.
4. The curing agent according to claim 1, wherein: the components of the composition comprise, by weight, 25% of high molecular polymer, 2.5% of lithium silicate, 0.1% of alkynediol, 1.5% of polycarboxylic acid water reducing agent, 1.2% of auxiliary agent, 4% of modified soybean phospholipid, 2.3% of myricyl alcohol, 2% of polyglycerol-10 polyricinoleate, 0.8% of mono-fatty acid glyceride and the balance of water; the alkynediol is dimethylhexynediol; the polycarboxylate superplasticizer is a polyether polycarboxylate superplasticizer, the solid content is 23%, and the water reduction rate is 28%; the auxiliary agent is nekal.
5. The curing agent according to claim 1, wherein: the components of the high-molecular-weight modified soybean lecithin polymer comprise, by weight, 23% of high-molecular polymer, 3% of lithium silicate, 0.05% of alkynediol, 2% of polycarboxylic acid water reducing agent, 2% of auxiliary agent, 8% of modified soybean lecithin, 2.5% of myricyl alcohol, 3% of polyglycerol-10 polyricinoleate, 0.7% of mono-fatty acid glyceride and the balance of water; the alkynediol is a mixture of ethoxylated alkynediol and dimethylhexynediol; the polycarboxylate superplasticizer is a polyether polycarboxylate superplasticizer, the solid content is 23%, and the water reduction rate is 28%; the auxiliary agent is Tween 80.
6. The curing agent according to claim 1, wherein: the components of the high-molecular-weight polymer comprise, by weight, 22% of a high-molecular polymer, 2% of lithium silicate, 0.08% of alkynediol, 1.8% of a polycarboxylic acid water reducing agent, 1.5% of an auxiliary agent, 6% of modified soybean phospholipid, 2% of myricyl alcohol, 2.5% of polyglycerol-10 polyricinoleate, 1% of mono-fatty acid glyceride and the balance of water; the alkyne diol is any one or a mixture of more than two of alkoxy alkyne diol, ethoxylated alkyne diol or alkoxy alkyne diol; the polycarboxylate superplasticizer is a polyether polycarboxylate superplasticizer, the solid content is 23%, and the water reduction rate is 28%; the auxiliary agent is Tween 80 and/or isomeric alcohol.
7. The curing agent according to claim 1, wherein: the raw materials for preparing the high molecular polymer comprise the following components in percentage by mass: 16% of acrylic acid, 10% of vinyl-2-pyrrolidone, 1.2% of methacryloyloxyethyl phosphorylcholine, 0.8% of N, N-methylene bisacrylamide, 0.3% of initiator and the balance of water.
8. The curing agent according to claim 1, wherein: the raw materials for preparing the high molecular polymer comprise the following components in percentage by mass: 18 percent of acrylic acid, 8 percent of vinyl-2-pyrrolidone, 1.0 percent of methacryloyloxyethyl phosphorylcholine, 0.7 percent of N, N-methylene bisacrylamide, 0.4 percent of initiator and the balance of water.
9. A method for preparing concrete plastic stage curing agent with reinforcing function comprises the following steps:
(1) According to the mass percentage, 5-25% of acrylic acid, 5-20% of vinyl-2-pyrrolidone, 1-5% of methacryloyloxyethyl phosphorylcholine, 0.5-1% of N, N-methylenebisacrylamide, 0.1-0.5% of initiator and the balance of water are used as raw materials to prepare the high molecular polymer, and the preparation method specifically comprises the following steps: dissolving the acrylic acid, the vinyl-2-pyrrolidone and the methacryloyloxyethyl phosphorylcholine in the proportion into water, and stirring and heating to 50-80 ℃; then adding the N, N-methylene bisacrylamide in the proportion, stirring at constant temperature for 5-15 minutes, adding the initiator in the proportion, keeping the temperature, stirring at high speed for 2~6 hours, and naturally cooling to room temperature; finally, adjusting the pH of the solution to be 5~7 to obtain a high molecular polymer solution;
(2) According to the mass percentage, 20 to 30 percent of the high molecular polymer obtained in the step (1), 1~8 percent of lithium silicate, 0.02 to 0.5 percent of alkynediol, 1 to 2.5 percent of polycarboxylic acid water reducing agent, 0.5 to 4 percent of auxiliary agent, 1.5 to 10 percent of modified soybean phospholipid, 1~6 percent of myricyl alcohol, 0.5 to 5 percent of polyglycerol-10 polyricinoleate, 0.5 to 3 percent of mono-fatty acid glyceride and the balance of water are taken as raw materials to prepare the concrete plasticity stage curing agent, and the concrete plasticity stage curing agent is specifically: sequentially adding the water, the lithium silicate, the alkynediol, the polycarboxylic acid water reducing agent and the auxiliary agent in the proportion into the high molecular polymer solution obtained in the step (1), and stirring for 30 to 45min; then adding the modified soybean phospholipid, the melissyl alcohol, the polyglycerol-10 polyricinoleate and the mono-fatty acid glyceride and the di-fatty acid glyceride in the proportion, and stirring uniformly at a stirring speed of 600 r/min-1200 r/min to obtain the concrete plasticity stage curing agent with the enhancement function; the auxiliary agent is at least one of nekal, tween 80 or isomeric alcohol.
CN202110849270.XA 2021-07-27 2021-07-27 Concrete plasticity stage curing agent with reinforcing function and preparation method thereof Active CN113563776B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110849270.XA CN113563776B (en) 2021-07-27 2021-07-27 Concrete plasticity stage curing agent with reinforcing function and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110849270.XA CN113563776B (en) 2021-07-27 2021-07-27 Concrete plasticity stage curing agent with reinforcing function and preparation method thereof

Publications (2)

Publication Number Publication Date
CN113563776A CN113563776A (en) 2021-10-29
CN113563776B true CN113563776B (en) 2022-12-06

Family

ID=78167849

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110849270.XA Active CN113563776B (en) 2021-07-27 2021-07-27 Concrete plasticity stage curing agent with reinforcing function and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113563776B (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101708975B (en) * 2009-11-17 2012-05-23 福建科之杰新材料有限公司 Concrete waterproof compacting agent and preparation method thereof
EP4137546A1 (en) * 2017-07-18 2023-02-22 Alcon Inc. Poly(meth)acrylamide-based copolymers
CN108264325A (en) * 2018-03-12 2018-07-10 雅安市弘利展化工有限公司 A kind of concrete dense curing agent and preparation method thereof

Also Published As

Publication number Publication date
CN113563776A (en) 2021-10-29

Similar Documents

Publication Publication Date Title
CN110922137B (en) Construction process for large-area structure repair system
CN112624656A (en) Reinforced organic-inorganic composite concrete external curing agent and preparation method thereof
CN107129629A (en) A kind of redispersible latex powder and preparation method thereof
US20160244369A1 (en) Waterproof mortar composition and method for preparing same
CN114085585A (en) Basalt fiber modified polymer cement waterproof coating
CN115477724A (en) Elastic emulsion for external wall with excellent rain mark resistance and preparation method thereof
CN111138209A (en) Concrete external curing agent
US20070172658A1 (en) Method for enhancing the water repellency of inorganic binder compositions, the compositions capable of being obtained by this method and the uses of these compositions
CN107311693B (en) Protective cement concrete curing agent and preparation method and application thereof
CN110818361B (en) Machine-sprayed thick-layer polymer repair mortar
CN113563776B (en) Concrete plasticity stage curing agent with reinforcing function and preparation method thereof
JPH11513653A (en) Concrete additives based on sulfomethylolated lignin
CN110922138B (en) Machine-sprayed polymer anti-crack plastering mortar
JPS6355143A (en) Resilient mortar composition
CN111777920B (en) Self-migration type surface hydrophilic finishing agent and preparation method and application thereof
US7993448B2 (en) Cement-containing composition for use with alkali-resistant fiberglass and poles made therefrom
CN109694216B (en) Water seepage-proof bonding material for expanded perlite external wall insulation board and preparation method thereof
CN114075066A (en) Magnesium oxychloride reinforced composite material and preparation method thereof
KR101346039B1 (en) Manufacturing method of one component type epoxy emulsion
CN107986686B (en) Wet-mixed mortar interface agent and preparation method and application thereof
CN109694214B (en) Novel bonding material for expanded perlite insulation board and preparation method and application thereof
CN107502074B (en) Concrete curing agent containing modified pineapple fibrilia and preparation method and application thereof
CN109796171A (en) A kind of modified organic silicon waterproof foam concrete
CN116535180B (en) Fiber reinforced mortar and preparation method thereof
CN115974446B (en) Composite permeable crystallization type waterproof agent and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20221025

Address after: No. 355, Hefang West Road, Qingyunpu District, Nanchang City, Jiangxi Province 330000

Applicant after: Jiangxi building materials research and Design Institute Co.,Ltd.

Address before: 330001 No.355, Hefang West Road, Nanchang City, Jiangxi Province

Applicant before: JIANGXI BUILDING MATERIALS SCIENTIFIC RESEARCH & DESIGN INSTITUTE

GR01 Patent grant
GR01 Patent grant