CN111592625A - Early strength type water reducing agent for machine-made sand concrete prestressed component and preparation method thereof - Google Patents
Early strength type water reducing agent for machine-made sand concrete prestressed component and preparation method thereof Download PDFInfo
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- CN111592625A CN111592625A CN201910856283.2A CN201910856283A CN111592625A CN 111592625 A CN111592625 A CN 111592625A CN 201910856283 A CN201910856283 A CN 201910856283A CN 111592625 A CN111592625 A CN 111592625A
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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
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses an early strength type water reducing agent for machine-made sand concrete prestressed components and a preparation method thereof, wherein the water reducing agent is composed of the following raw materials: the modified acrylic acid. The preparation method comprises the following steps: mixing acrylic acid, amide unsaturated monomers, sulfonate unsaturated monomers and deionized water to obtain a mixed solution A; mixing unsaturated alcohol ester with deionized water to obtain a mixed solution B; mixing a first initiator, a chain transfer agent and deionized water to obtain a mixed solution C; mixing and dissolving methyl allyl polyoxyethylene ether and deionized water, heating, adding a second initiator, dropwise adding the mixed solution A, B and C, and finally adding alkali for neutralization. The water reducing agent disclosed by the invention has higher water reducing rate and better early strength effect. The preparation method is simple, the raw materials are easy to obtain, the requirement on production equipment is low, and the safety is high.
Description
Technical Field
The invention relates to the technical field of building concrete admixtures, in particular to an early strength type water reducing agent for machine-made sand concrete prestressed components and a preparation method thereof.
Background
The polycarboxylate superplasticizer has the characteristics of high dispersibility, high water reducing rate and high slump retention, and is widely applied to concrete engineering. With the rapid development of economic technology in China, the scale of infrastructure in China is getting larger and larger. In many projects, especially in the actual production of prefabricated parts, the demands for accelerating the construction progress, accelerating the turnover of moulds and realizing the maximized benefit are increasing, and the demand for early-strength mother liquor is increasing. In addition, the early-strength polycarboxylate superplasticizer can obviously improve the problems that the early-strength of the concrete constructed in winter is low and is easy to be damaged by freezing and the like. With the national vigorous popularization of assembly type buildings and the increasing of large-scale high-quality engineering, the application of the early-strength polycarboxylic acid water reducing agent is more and more extensive. For a long time, the general means for improving the initial strength of concrete is usually solved by compounding. The research on synthesizing the early-strength polycarboxylate superplasticizer through molecular design is rare, and the research on the early-strength polycarboxylate superplasticizer for the machine-made sand concrete prestressed member is more rare, so that the application of the early-strength polycarboxylate superplasticizer in precast member concrete is greatly limited. Meanwhile, with the gradual depletion of river sand in China, the research on the early-strength polycarboxylate superplasticizer suitable for machine-made sand is more urgent.
CN109293267A discloses an early strength type polycarboxylate superplasticizer which comprises the following components in percentage by weight: 10-20% of tricalcium silicate, 20-30% of carboxylic acid ethylene copolymer and 50-70% of deionized water. Adding the mixture into a ball mill according to a certain proportion, and grinding to finally obtain the crystal nucleus early-strength type polycarboxylate superplasticizer. The crystal nucleus early strength agent is prepared and then the initial strength of concrete is improved by compounding, modification is not carried out on the basis of the molecular structure of the polycarboxylic acid water reducing agent, the preparation process is complex, and the product has the problems of poor adaptability and the like.
CN106928407A discloses that an ether early strength type polycarboxylate superplasticizer is prepared by taking an ultra-long side chain polyether monomer, a graft modified polyether chain monomer and acrylic acid thereof as main raw materials under the action of an initiator, a chain transfer agent and the like. Has good application effect in the aspects of early strength and concrete workability. But the preparation process of the product is complicated, the reaction temperature is high, the requirement on equipment is high, the safety requirement is high, and the product is not beneficial to popularization.
Therefore, the synthesis of the early strength type water reducing agent for machine-made sand concrete prestress, which has a better cost performance ratio, has great significance by researching the relationship between the molecular structure of the polycarboxylate water reducing agent and the performance of the product application material.
Disclosure of Invention
The invention mainly solves the technical problem of providing an early strength water reducing agent for machine-made sand concrete prestressed components and a preparation method thereof, solves the problem that most products in the prior art are compounded to improve the strength, and also solves the problem of poor adaptability with machine-made sand concrete.
In order to solve the technical problems, the invention adopts a technical scheme that: the early strength type water reducing agent for the machine-made sand concrete prestressed component is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 30-45 parts of acrylic acid, 5-10 parts of amide unsaturated monomer, 3-5 parts of sulfonate unsaturated monomer, 10-15 parts of unsaturated alcohol ester, 0.1-0.8 part of first initiator, 0.5-2.5 parts of chain transfer agent, 380 parts of methallyl polyoxyethylene ether, 1-5 parts of second initiator and 600 parts of deionized water, wherein the deionized water comprises a first part of deionized water, a second part of deionized water, a third part of deionized water and a fourth part of deionized water, and the mass ratio of the first part of deionized water, the second part of deionized water, the third part of deionized water to the fourth part of deionized water is 1:0.8: 1: (2-2.5).
In a preferred embodiment of the invention, the amide unsaturated monomer is acrylamide and sodium 2-acrylamido-methylpropanesulfonate.
In a preferred embodiment of the present invention, the sulfonate unsaturated monomer is one or two of sodium methallyl sulfonate and sodium styrene sulfonate.
In a preferred embodiment of the present invention, the unsaturated alcohol ester is polyethylene glycol diacrylate, wherein the polymerization degree of the polyethylene glycol is one or more of 200, 400 and 600.
In a preferred embodiment of the present invention, the first initiator is one or two of vitamin C and ferrous sulfate heptahydrate, and the chain transfer agent is one or two of mercaptoethanol and mercaptopropionic acid.
In a preferred embodiment of the invention, the molecular weight of the methallyl polyoxyethylene ether is 4000-6000, and the second initiator is one or two of ammonium persulfate and hydrogen peroxide.
In order to solve the technical problem, the invention adopts another technical scheme that: the preparation method of the early strength type water reducing agent for the machine-made sand concrete prestressed component comprises the following steps:
(1) mixing acrylic acid, amide unsaturated monomers, sulfonate unsaturated monomers and a first part of deionized water to obtain a mixed solution A for later use;
(2) mixing unsaturated alcohol ester with a second part of deionized water to obtain a mixed solution B for later use;
(3) mixing the first initiator, the chain transfer agent and the third part of deionized water to obtain a mixed solution C for later use;
(4) mixing and dissolving methyl allyl polyoxyethylene ether and the fourth part of deionized water, heating to 35 +/-5 ℃, adding a second initiator, dropwise adding the mixed solution A, the mixed solution B and the mixed solution C to perform aqueous polymerization reaction, and continuously stirring for 1 hour after dropwise adding;
(5) and finally adding alkali for neutralization to obtain the early strength water reducer for the machine-made sand concrete prestressed component.
In a preferred embodiment of the present invention, in step (4), the dropping time of mixture A is 2.5 hours, the dropping time of mixture B is 2.5 hours, and the dropping time of mixture C is 3 hours.
In a preferred embodiment of the invention, alkali is finally added in step (5) to neutralize the pH value to 5.5-7.
The invention has the beneficial effects that:
1. according to the invention, sulfonate ions are introduced into the molecular structure of the water reducer, so that the content of polycarboxylic acid retarding groups is reduced, amide groups are introduced to promote the hydration speed of cement, the introduction of the polyethylene glycol diacrylate can improve the adaptability of the water reducer and effectively improve the workability of concrete, and the hydration of cement can be accelerated by the low molecular weight polyethylene glycol hydrolyzed from the polyethylene glycol diacrylate, so that the early strength effect of polycarboxylic acid water reducer molecules is greatly improved, and the application prospect is wide.
2. The invention adopts the long side chain methyl allyl polyoxyethylene ether with the molecular weight of 4000-.
3. The preparation method is simple, the raw materials are easy to obtain, the requirement on production equipment is low, and the safety is high.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1
An early strength type water reducing agent for machine-made sand concrete prestressed components is composed of the following raw materials by weight: 41g of acrylic acid, 10g of acrylamide, 5g of sodium methallyl sulfonate, 15g of polyethylene glycol diacrylate, 0.7g of vitamin C, 2.0g of mercaptopropionic acid, 365g of methyl allyl polyoxyethylene ether monomer with the molecular weight of 4000, 4.0g of hydrogen peroxide with the concentration of 27.5wt% and 530g of deionized water, wherein the deionized water comprises 100g of a first part of deionized water, 80g of a second part of deionized water, 100g of a third part of deionized water and 250g of a fourth part of deionized water.
The preparation method comprises the following steps:
(1) adding 41g of acrylic acid, 10g of acrylamide, 5g of sodium methallyl sulfonate and 100g of deionized water in sequence, and mixing to obtain a mixed solution A for later use;
(2) mixing 15g of polyethylene glycol diacrylate with 80g of deionized water to obtain a mixed solution B for later use;
(3) mixing 0.7g of vitamin C, 2.0g of mercaptopropionic acid and 100g of deionized water to obtain a mixed solution C for later use;
(4) 365g of methyl allyl polyoxyethylene ether monomer with the molecular weight of 4000 is added into a 1L glass bottle, 250g of deionized water is added, stirring is started, heating and temperature rising are carried out, after the monomer is fully dissolved, when the temperature rises to 35 +/-5 ℃, 4.0g of hydrogen peroxide with the concentration of 27.5wt% is added, then mixed liquor A, mixed liquor B and mixed liquor C are dropwise added for carrying out aqueous polymerization reaction, stirring is continued for 1 hour after dropwise addition is finished, the dropwise addition time of the mixed liquor A is 2.5 hours, the dropwise addition time of the mixed liquor B is 2.5 hours, and the dropwise addition time of the mixed liquor C is 3 hours;
(5) and finally, adding liquid alkali with the mass percentage concentration of 32% to neutralize the pH value to 5.5-7, and then supplementing water until the solid content reaches 40we%, thus obtaining the early strength water reducer for the machine-made sand concrete prestressed component.
Example 2
An early strength type water reducing agent for machine-made sand concrete prestressed components is composed of the following raw materials by weight: 36g of acrylic acid, 8g of acrylamide, 3g of sodium methallyl sulfonate, 10g of polyethylene glycol diacrylate, 0.15g of heptahydrate and ferrous sulfate, 0.5g of mercaptoethanol, 365g of methyl allyl polyoxyethylene ether monomer with molecular weight of 5000, 1.8g of ammonium persulfate and 530g of deionized water, wherein the deionized water comprises 100g of a first part of deionized water, 80g of a second part of deionized water, 100g of a third part of deionized water and 250g of a fourth part of deionized water.
The preparation method comprises the following steps:
(1) adding 36g of acrylic acid, 8g of acrylamide, 3g of sodium methallyl sulfonate and 100g of deionized water in sequence, and mixing to obtain a mixed solution A for later use;
(2) mixing 10g of polyethylene glycol diacrylate and 80g of deionized water to obtain a mixed solution B for later use;
(3) mixing 0.15g of heptahydrate with ferrous sulfate, 0.5g of mercaptoethanol and 100g of deionized water to obtain a mixed solution C for later use;
(4) adding 365g of methyl allyl polyoxyethylene ether monomer with the molecular weight of 5000 into a 1L glass bottle, adding 250g of deionized water, starting stirring, heating to raise the temperature, adding 1.8g of ammonium persulfate when the temperature is raised to 35 +/-5 ℃ after the monomer is fully dissolved, then dropwise adding the mixed solution A, the mixed solution B and the mixed solution C to perform aqueous polymerization reaction, and continuing stirring for 1 hour after dropwise adding, wherein the dropwise adding time of the mixed solution A is 2.5 hours, the dropwise adding time of the mixed solution B is 2.5 hours, and the dropwise adding time of the mixed solution C is 3 hours;
(5) and finally, adding liquid alkali with the mass percentage concentration of 32% to neutralize the pH value to 5.5-7, and then supplementing water until the solid content reaches 40we%, thus obtaining the early strength water reducer for the machine-made sand concrete prestressed component.
Example 3
An early strength type water reducing agent for machine-made sand concrete prestressed components is composed of the following raw materials by weight: 34g of acrylic acid, 8g of acrylamide, 2g of sodium methallyl sulfonate, 15g of polyethylene glycol diacrylate, 0.7g of vitamin C, 2.4g of mercaptoethanol, 365g of methyl allyl polyoxyethylene ether monomer with molecular weight of 6000, 1.5g of ammonium persulfate and 500g of deionized water, wherein the deionized water comprises 100g of a first part of deionized water, 80g of a second part of deionized water, 100g of a third part of deionized water and 220g of a fourth part of deionized water.
The preparation method comprises the following steps:
(1) adding 34g of acrylic acid, 8g of acrylamide, 2g of sodium methallyl sulfonate and 100g of deionized water in sequence, and mixing to obtain a mixed solution A for later use;
(2) mixing 15g of polyethylene glycol diacrylate with 80g of deionized water to obtain a mixed solution B for later use;
(3) mixing 0.7g of vitamin C, 2.4g of mercaptoethanol and 100g of deionized water to obtain a mixed solution C for later use;
(4) adding 365g of methyl allyl polyoxyethylene ether monomer with molecular weight of 6000 into a 1L glass bottle, adding 220g of deionized water, starting stirring, heating to raise the temperature, adding 1.5g of ammonium persulfate when the temperature is raised to 35 +/-5 ℃ after the monomer is fully dissolved, then dropwise adding mixed liquor A, mixed liquor B and mixed liquor C to perform aqueous polymerization reaction, and continuing stirring for 1 hour after dropwise adding, wherein the dropwise adding time of the mixed liquor A is 2.5 hours, the dropwise adding time of the mixed liquor B is 2.5 hours, and the dropwise adding time of the mixed liquor C is 3 hours;
(5) and finally, adding liquid alkali with the mass percentage concentration of 32% to neutralize the pH value to 5.5-7, and then supplementing water until the solid content reaches 40wt%, thus obtaining the early strength water reducer for the machine-made sand concrete prestressed component.
The slump and various age strengths of concrete were measured according to GB8076-2008 "concrete admixture" by comparing the products obtained in examples 1-3 with a conventional polycarboxylic acid water reducing agent using standard cement. Wherein the mixing proportion of the concrete is as follows: carrying out 350kg/m cement tophan, 8.5kg/m mechanically-manufactured sand and 10.5kg/m stone tophan, controlling the slump constant at 180 +/-10 mm, and detecting results are shown in table 1.
TABLE 1 Strength chart of concrete in different ages
As can be seen from Table 1, the concrete prepared by using the product of the invention has higher early strength than a common water reducing agent, is very suitable for machine-made sand concrete prestressed members, and can obviously improve the early strength of the concrete without the phenomenon of retrogradation of later strength.
According to the invention, sulfonate ions are introduced into the molecular structure of the water reducer, so that the content of polycarboxylic acid retarding groups is reduced, amide groups are introduced to promote the hydration speed of cement, the introduction of the polyethylene glycol diacrylate can improve the adaptability of the water reducer and effectively improve the workability of concrete, and the hydration of cement can be accelerated by the low molecular weight polyethylene glycol hydrolyzed from the polyethylene glycol diacrylate, so that the early strength effect of polycarboxylic acid water reducer molecules is greatly improved, and the application prospect is wide. The invention adopts the long side chain methyl allyl polyoxyethylene ether with the molecular weight of 4000-. The preparation method is simple, the raw materials are easy to obtain, the requirement on production equipment is low, and the safety is high.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a machine-made sand concrete early strength type water-reducing agent for prestressing force component which characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 30-45 parts of acrylic acid, 5-10 parts of amide unsaturated monomer, 3-5 parts of sulfonate unsaturated monomer, 10-15 parts of unsaturated alcohol ester, 0.1-0.8 part of first initiator, 0.5-2.5 parts of chain transfer agent, 380 parts of methallyl polyoxyethylene ether, 1-5 parts of second initiator and 600 parts of deionized water, wherein the deionized water comprises a first part of deionized water, a second part of deionized water, a third part of deionized water and a fourth part of deionized water, and the mass ratio of the first part of deionized water, the second part of deionized water, the third part of deionized water to the fourth part of deionized water is 1:0.8: 1: (2-2.5).
2. The early strength water reducer for machine-made sand concrete prestressed members according to claim 1, characterized in that: the amide unsaturated monomer is acrylamide and 2-acrylamide-sodium methyl acrylate sulfonate.
3. The early strength water reducer for machine-made sand concrete prestressed members according to claim 1, characterized in that: the sulfonate unsaturated monomer is one or two of sodium methyl propylene sulfonate and sodium styrene sulfonate.
4. The early strength water reducer for machine-made sand concrete prestressed members according to claim 1, characterized in that: the unsaturated alcohol ester is polyethylene glycol diacrylate, wherein the polymerization degree of the polyethylene glycol is one or more of 200, 400 and 600.
5. The early strength water reducer for machine-made sand concrete prestressed members according to claim 1, characterized in that: the first initiator is one or two of vitamin C and ferrous sulfate heptahydrate, and the chain transfer agent is one or two of mercaptoethanol and mercaptopropionic acid.
6. The early strength water reducer for machine-made sand concrete prestressed members according to claim 1, characterized in that: the molecular weight of the methyl allyl polyoxyethylene ether is 4000-6000.
7. The early strength water reducer for machine-made sand concrete prestressed members according to claim 1, characterized in that: the second initiator is one or two of ammonium persulfate and hydrogen peroxide.
8. The preparation method of the early strength water reducer for the machine-made sand concrete prestressed component according to claim 1, characterized in that: the method comprises the following steps:
(1) mixing acrylic acid, amide unsaturated monomers, sulfonate unsaturated monomers and a first part of deionized water to obtain a mixed solution A for later use;
(2) mixing unsaturated alcohol ester with a second part of deionized water to obtain a mixed solution B for later use;
(3) mixing the first initiator, the chain transfer agent and the third part of deionized water to obtain a mixed solution C for later use;
(4) mixing and dissolving methyl allyl polyoxyethylene ether and the fourth part of deionized water, heating to 35 +/-5 ℃, adding a second initiator, dropwise adding the mixed solution A, the mixed solution B and the mixed solution C to perform aqueous polymerization reaction, and continuously stirring for 1 hour after dropwise adding;
(5) and finally adding alkali for neutralization to obtain the early strength water reducer for the machine-made sand concrete prestressed component.
9. The process according to claim 8, wherein the addition time of the mixture A for the polymerization reaction in the step (4) is 2.5 hours, the addition time of the mixture B for the polymerization reaction is 2.5 hours, and the addition time of the mixture C for the polymerization reaction is 3 hours.
10. The method according to claim 9, wherein the pH is neutralized to 5.5 to 7 by adding a base at the end of the neutralization in the step (5).
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| CN103804609A (en) * | 2014-01-21 | 2014-05-21 | 北京奥润开元环保科技研究院有限公司 | Polycarboxylic acid water reducer with reticular structure and preparation method thereof |
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| CN103804609A (en) * | 2014-01-21 | 2014-05-21 | 北京奥润开元环保科技研究院有限公司 | Polycarboxylic acid water reducer with reticular structure and preparation method thereof |
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Application publication date: 20200828 |