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CN118930758A - A kind of air-entraining pulping agent mother solution and its preparation method and application - Google Patents

A kind of air-entraining pulping agent mother solution and its preparation method and application Download PDF

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CN118930758A
CN118930758A CN202411026904.1A CN202411026904A CN118930758A CN 118930758 A CN118930758 A CN 118930758A CN 202411026904 A CN202411026904 A CN 202411026904A CN 118930758 A CN118930758 A CN 118930758A
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unsaturated
agent
concrete
mother liquor
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全志龙
陈宏伟
王士斌
钟丽娜
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Huaqiao University
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Huaqiao University
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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
    • 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
    • C04B24/24—Macromolecular compounds
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
    • 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
    • C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
    • 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
    • C04B2103/304—Air-entrainers

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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)
  • Macromonomer-Based Addition Polymer (AREA)

Abstract

本发明公开了一种引气型提浆剂母液及其制备方法和应用，引气型提浆剂母液的固含量为35‑45wt％，且由包括如下质量份的组分在内的原料制得：5‑50份聚氧乙烯基大单体、3‑30份不饱和羧酸或/和不饱和酸酐、0.3‑6份α‑烯基磺酸钠、0.003‑7份单环氧基封端不饱和化合物、0.001‑2.5份交联剂、0.3‑1.5份氧化还原引发组合物和水。上述各原料通过聚合反应形成互穿网络结构，掺用于混凝土后能明显提升混凝土拌合物浆体的包裹性、减小气珠的尺寸、抑制微小气珠在集料间隙上浮、逸散和聚并的过程，提高并能保持小气珠在混凝土中的匀质分散，改善混凝土和易性和工作性，并在保障混凝土强度设计等级的同时明显降低混凝土拌合料的容重、增加混凝土的流动性。The invention discloses an air-entraining slurry agent mother liquor and a preparation method and application thereof. The air-entraining slurry agent mother liquor has a solid content of 35-45wt%, and is prepared from raw materials including the following components in parts by mass: 5-50 parts of polyoxyethylene macromonomer, 3-30 parts of unsaturated carboxylic acid or/and unsaturated anhydride, 0.3-6 parts of sodium α-olefin sulfonate, 0.003-7 parts of monoepoxy-terminated unsaturated compound, 0.001-2.5 parts of cross-linking agent, 0.3-1.5 parts of redox initiation composition and water. The above raw materials form an interpenetrating network structure through polymerization reaction, which can significantly improve the encapsulation of concrete mixture slurry, reduce the size of gas droplets, inhibit the floating, escaping and aggregation process of tiny gas droplets in aggregate gaps after being added to concrete, improve and maintain the uniform dispersion of small gas droplets in concrete, improve the workability and workability of concrete, and significantly reduce the bulk density of concrete mixture and increase the fluidity of concrete while ensuring the design grade of concrete strength.

Description

Air-entraining type slurry extraction agent mother liquor and preparation method and application thereof
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to an air-entraining type slurry-extracting agent mother solution, a preparation method and application thereof.
Background
Cement concrete technology has been continuously accumulating, developing and perfecting for nearly 200 years. The engineering application of ultra-long, ultra-high and ultra-large volume concrete has become the mainstream of concrete materials due to the long development and social progress of the high-efficiency/high-performance water reducer technology in the late 70 s of the last century. The high-performance polycarboxylic acid water reducer is a new generation of concrete admixture because of high water reducing rate, green and environment-friendly production raw materials and process, but the phenomena of bleeding, segregation, bottom scraping and the like of a newly mixed concrete material are easily caused by the change of ground materials, fine aggregates and mineral powder admixture in the concrete mixture. The technical personnel generally improve the plumpness of concrete mixture slurry and the coating property of coarse aggregate by improving the water-cement ratio, changing the mixing amount of a water reducer, using auxiliary agents (such as a thickening agent and an air entraining agent) and the like, improve the working performance of concrete, and endow the freshly mixed concrete with the excellent performances of larger fluidity, segregation resistance stability, good filling property and the like.
The hydroxypropyl methylcellulose, the polyacrylic acid polymer and the vegetable gum are often used as thickening or water-retaining agents in engineering, and the proper amount of thickening or water-retaining agents are introduced, so that the coating property of slurry in concrete mixture on stones can be obviously improved, the segregation and bleeding phenomena of concrete are relieved or improved, the workability and fluidity of fresh concrete are improved, and the stability of materials is improved. However, the action relationship between the thickener and the cement particles can compete with the action between the polycarboxylate water reducer and the cement particles, and the entanglement effect interference among the molecular chains of the thickening component can reduce the use effect of the water reducer, so that the concrete mixture has larger fluidity loss in a short time, and is unfavorable for construction and pouring; on the other hand, the air entraining agent is doped to improve the fullness and fluidity of the concrete mixture slurry, but after the concrete mixture containing inferior air bubbles is placed, transported, loaded and unloaded or poured, most of small air bubbles contained in the material are often gathered, coalesced and form large air bubbles, which are manifested as air bubble overflow and floating slurry, seriously affect the engineering appearance and endanger the engineering quality and durability. In addition, studies have shown that an increase in the amount of concrete bleed air by 1% will result in a decrease in 28d compressive strength by about 5%, directly affecting the hardening strength of the concrete, and negatively affecting the concrete structure and durability.
Disclosure of Invention
The invention aims to provide an air-entraining type slurry stripping agent mother solution capable of reducing air bubble collection while carrying out air-entraining and slurry stripping in a concrete mixture, and a preparation method and application thereof.
The technical scheme of the invention is as follows:
The bleed air type slurry stripping agent mother liquor has the solid content of 35-45wt% and is prepared from the following raw materials in parts by mass:
5 to 50 parts of polyoxyethylene unsaturated macromer, 3 to 30 parts of unsaturated carboxylic acid or/and unsaturated anhydride, 0.3 to 6 parts of alpha-sodium alkenyl sulfonate, 0.003 to 7 parts of monoepoxy end-capped unsaturated compound, 0.001 to 2.5 parts of cross-linking agent, 0.3 to 1.5 parts of redox initiation composition, 0.3 to 1.5 parts of chain transfer agent and 0.5 to 91 parts of water;
Wherein the polyoxyethylene unsaturated macromer is at least one selected from allyl polyoxyethylene ether, methallyl polyoxyethylene ether, isopentenyl polyoxyethylene ether, polyoxyethylene acrylate, polyoxyethylene methacrylate and polyoxyethylene isopentenyl acrylate, and the polyoxyethylene unsaturated macromer has a number average molecular weight of 500-5000;
the monoepoxy-terminated unsaturated compound is at least one of allyl glycidyl ether, methallyl glycidyl ether, prenyl alcohol glycidyl ether, glycidyl acrylate, glycidyl methacrylate and prenyl acid glycidyl ester;
The cross-linking agent is And/or H 2N—X'—NH2, wherein R is H or CH 3, R 'is H or CH 3, X is a (CH 2)n1 segment, (CH 2CH2O)n2 segment or ester segment, X' has (CH 2)n3 segment, (CH 2CH2O)n4 segment or ester segment, n1, n2, n3, and n4 are integers;
In some possible implementations, the raw material further includes 0.01-1 parts by mass of chitosan, and the viscosity of the chitosan is 10-500mpa·s.
In some possible implementations, the cross-linking agent is selected from at least one of diethanol dimethacrylate, polyethylene glycol dimethacrylate, 1, 6-hexanediol dimethacrylate and 1, 6-hexanediol dimethacrylate, diallyl glycol ether, diallyl polyethylene glycol ether, ethylenediamine, ethylene glycol tri-diamine, decylenediamine, and butanediamine.
In some possible implementations, the redox initiation composition includes an oxidizing agent and a reducing agent, the oxidizing agent being ammonium persulfate and/or peroxide, the reducing agent being Fe 2+ and/or vitamin C, the mass ratio of the oxidizing agent to the reducing agent being 1.5-3.75:1.
In some possible implementations the chain transfer agent is thioglycolic acid and/or mercaptopropionic acid, the mass ratio of chain transfer agent to reducing agent being 1:1.2-4.
In some possible implementations, the unsaturated carboxylic acid is selected from at least one of acrylic acid, methacrylic acid, and maleic acid;
the unsaturated acid anhydride is at least one selected from the group consisting of acrylic anhydride, methacrylic anhydride and maleic anhydride.
The preparation method of the bleed air type slurry stripping agent mother liquor comprises the following steps:
(1) Dissolving 3-90% of polyoxyethylene unsaturated macromer, 5-75% of unsaturated carboxylic acid or/and unsaturated anhydride, 0-50% of monoepoxy end-capped unsaturated compound, 0-100% of alpha-sodium alkenyl sulfonate and partial cross-linking agent in proper water, adding 30-70% of redox initiation composition and 30-70% of chain transfer agent in batches at room temperature, controlling the temperature of a reaction system to be not more than 60 ℃, adding partial cross-linking agent after the temperature of the reaction system begins to drop, and obtaining a solution of a first intermediate after the temperature of the reaction system begins to drop obviously, wherein the total adding amount of the cross-linking agent in the step (1) is 25-85%;
(2) Adding the rest of polyoxyethylene unsaturated macromer, unsaturated carboxylic acid or/and unsaturated anhydride, monoepoxy end-capped unsaturated compound, alpha-sodium alkenyl sulfonate, partial cross-linking agent and proper amount of water into the first intermediate solution, adding the rest of redox initiation composition and chain transfer agent at 30 ℃, controlling the temperature of a reaction system to be not more than 60 ℃, adding the rest of cross-linking agent after the temperature of the reaction system begins to drop, and cooling the temperature of the reaction system to room temperature to obtain a solution of a second intermediate;
(3) Regulating the solid content of the solution of the second intermediate to 35-45wt% to obtain the air-entraining type pulp-extracting agent mother liquor with an interpenetrating network structure;
In some possible implementation modes, the raw materials further comprise 0.01-1 part by weight of chitosan, wherein the viscosity of the chitosan is 10-500 mPa.s;
chitosan is added in at least one of the steps (1), (2) and (3).
A concrete external mortar lifting composition comprises the air entraining type mortar lifting agent mother liquor.
The invention has at least the following beneficial effects:
1. The raw materials of the air-entraining type slurry stripping agent mother liquor form an interpenetrating network structure through polymerization reaction, so that the air-entraining type slurry stripping agent mother liquor can obviously improve the coating property of concrete mixture slurry, reduce the size of air beads, inhibit the processes of floating, dissipation and coalescence of the micro air beads through aggregate gaps, improve and maintain the uniform dispersion of the micro air beads in the concrete, improve the workability and working performance of the concrete, and obviously reduce the volume weight of the concrete mixture while guaranteeing the strength design grade of the concrete.
2. In some possible implementations, chitosan participates in forming or is modified on the interpenetrating network, which can further improve the water retention performance and strength of the concrete.
3. The concrete external mortar lifting composition obtained by compounding the air entraining type mortar lifting agent mother liquor and other components is mixed into concrete, so that the plumpness of the concrete mixture slurry is improved, and the hardening strength of the concrete is not reduced. In addition, compared with the concrete external mortar composition for concrete which is obtained by compounding after being replaced by the existing triterpenoid saponin air entraining agent, no additional thickening agent is needed.
Detailed Description
The technical scheme of the invention is further illustrated and described through the following specific embodiments.
In the following examples, the water used may be one or more of distilled water, purified water, drinking water, tap water; unless otherwise specified, the detection methods in the following embodiments are all conventional detection methods; the reagents in the examples described below were purchased commercially unless otherwise specified.
The chitosan used in the following examples had a degree of deacetylation of 85% and in other possible embodiments a degree of deacetylation of 85% -100%.
The high performance polycarboxylate water reducer mother liquor used in the following examples is ZS-M90M produced by Ministry of novel building materials technology, inc. of well-established (Fujian); the silicone defoamer used in the following examples was silicone defoamer 611-c; the triterpene saponin air entraining agent is also a commercial old product; the thickener is HPMC with 10-20 ten thousand viscosity (aq).
Example 1
(1) 120G of isopentenyl alcohol polyoxyethylene ether, 200g of methyl allyl polyoxyethylene ether, 55g of acrylic acid and 4.8g of ethylene glycol dimethacrylate are dispersed and dissolved in 400g of water, and after uniform stirring and dissolution, respectively dropwise adding redox initiation composition (0.85 g of hydrogen peroxide, 0.5g of vitamin C) and 1.1g of mercaptopropionic acid into a monomer mixed solution in batches to initiate aqueous phase polymerization reaction, controlling the temperature of a reaction system to be not more than 60 ℃, and obviously reducing the temperature of the reaction system to obtain a first intermediate solution.
(2) Adding mixed solution of 230g of isopentenyl alcohol polyoxyethylene ether, 100g of acrylic acid, 1.6g of 1, 6-hexanediol dimethacrylate, 1.8g of glycidyl acrylate, 48g of alpha-sodium alkenyl sulfonate and 220g of water into the first intermediate solution under stirring, after uniformly stirring and dissolving, respectively dropwise adding redox initiation composition (2.9 g of hydrogen peroxide, 1g of vitamin C) and 2.9g of chain transfer agent (mercaptopropionic acid) into the monomer mixed solution in batches to initiate polymerization reaction, controlling the temperature of a reaction system to be not more than 60 ℃, adjusting the pH value to be neutral after the temperature of the reaction system begins to drop, adding 0.8g of ethylenediamine, continuously stirring, and obtaining the second intermediate solution after the temperature of the reaction system begins to drop obviously.
(3) And adding a proper amount of water to adjust the solid content of the second intermediate solution to 40wt percent, so as to obtain the air-entraining type slurry agent mother liquor with the interpenetrating network structure.
Example 2
(1) 280G of isopentenyl alcohol polyoxyethylene ether, 60g of acrylic acid, 10g of maleic anhydride, 6g of polyethylene glycol dimethacrylate (M n =200 of polyethylene glycol) and 40g of alpha-alkenyl sodium sulfonate are dissolved in 450g of water, and after stirring and dissolving uniformly, redox initiation composition (1.7 g of hydrogen peroxide, 7g of vitamin C) and 2g of mercaptopropionic acid are respectively added into a mixed solution of monomers in batches to initiate polymerization reaction, the temperature of a reaction system is controlled to be not more than 60 ℃, and the temperature of the reaction system begins to drop obviously to obtain a first intermediate solution.
(2) Adding a mixed solution of 410g of isopentenyl alcohol polyoxyethylene ether, 60g of acrylic acid, 2.8g of glycidyl methacrylate and 127.2g of water into the first intermediate solution under stirring, dropwise adding a redox initiation composition (1.7 g of hydrogen peroxide, 0.7g of vitamin C) and 2g of mercaptopropionic acid into the monomer mixed solution in batches after stirring uniformly, controlling the temperature of a reaction system to be not more than 60 ℃, adjusting the pH value to be neutral after the temperature of the reaction system begins to drop, then adding 100g of aqueous solution containing 1.2g of ethylene glycol diamine trisulfide and 0.8g of chitosan, continuously stirring, and cooling the temperature of the reaction system to room temperature to obtain a second intermediate solution.
(3) Adding a proper amount of water to adjust the solid content of the second intermediate solution to 40wt% to obtain a crosslinked bleed air slurry agent mother solution; the viscosity of the chitosan used was 150 mPa.s.
Example 3
(1) 280G of isopentenyl alcohol polyoxyethylene ether, 70g of acrylic acid, 3g of 1, 6-hexanediol dimethacrylate and 40g of alpha-alkenyl sodium sulfonate are dissolved in 260g of water, and after the mixture is stirred and dissolved uniformly, redox initiation composition (1.5 g of hydrogen peroxide, 0.7g of vitamin C) and 1g of mercaptopropionic acid are respectively added into the aqueous solution of the mixed monomers in a batch mode to initiate polymerization reaction, the temperature of a reaction system is controlled to be not more than 60 ℃, and the temperature of the reaction system begins to be obviously reduced to obtain a first intermediate solution.
(2) Adding a mixed solution of 110g of isopentenyl polyoxyethylene ether, 200g of methyl allyl polyoxyethylene ester, 50g of acrylic acid, 10g of methacrylic acid, 3.2g of allyl glycidyl ether and 176.8g of water into a first intermediate solution under stirring, dropwise adding a redox initiation composition (1.5 g of hydrogen peroxide, 0.7g of vitamin C) and 1g of mercaptopropionic acid into the monomer mixed solution in batches after stirring uniformly, controlling the temperature of a reaction system to be not more than 60 ℃, adjusting the pH value to be neutral after the temperature of the reaction system begins to drop, adding 200g of chitosan aqueous solution containing 3.2g of chitosan with the viscosity of 150 mPa.s, continuously stirring, and cooling the temperature of the reaction system to room temperature to obtain a second intermediate solution.
(3) And adding a proper amount of water to adjust the solid content of the second intermediate solution to 40wt percent, so as to obtain the air-entraining type slurry agent mother liquor with the interpenetrating network structure.
Example 4
(1) 300G of isopentenyl polyoxyethylene ether, 55g of acrylic acid, 6g of allyl glycidyl ether and 15g of alpha-alkenyl sodium sulfonate are dissolved in 400g of water, after stirring and dissolving uniformly at room temperature, respectively dropwise adding redox initiation composition (2.5 g of hydrogen peroxide, 1.2g of vitamin C) and 2.8g of mercaptopropionic acid into a monomer mixed solution in batches to initiate polymerization reaction, controlling the temperature of a reaction system to be not more than 60 ℃, adjusting pH to be neutral after the temperature of the reaction system begins to drop, then adding 10g of decanediamine, and obtaining a first intermediate solution after the temperature of the reaction system begins to drop obviously.
(2) Adding a mixed solution of 300g of isopentenyl polyoxyethylene ether, 50g of acrylic acid, 15g of maleic acid, 5.8g of isopentenyl alcohol glycidyl ether and 25g of alpha-sodium alkenyl sulfonate and 54.2g of water into a first intermediate solution under stirring, dropwise adding a redox initiation composition (2.5 g of hydrogen peroxide, 1.2g of vitamin C) and 2.8g of mercaptopropionic acid into the monomer mixed solution in batches after stirring uniformly, initiating polymerization reaction, controlling the temperature of a reaction system to be not more than 60 ℃, adjusting the pH value to be neutral after the temperature of the reaction system begins to drop, then adding 2g of ethylenediamine and 4.5g of water-soluble chitosan (300 mPa.s), continuously stirring, and cooling the temperature of the reaction system to room temperature to obtain a second intermediate solution.
(3) And adding a proper amount of water to adjust the solid content of the second intermediate solution to 40wt percent, so as to obtain the air-entraining type slurry agent mother liquor with the interpenetrating network structure.
Example 5
(1) 50G of acrylic acid, 140g of isopentenyl polyoxyethylene ether, 2g of 1, 6-hexanediol dimethacrylate and 70g of alpha-alkenyl sodium sulfonate are dissolved in 260g of water, and after uniform stirring and dissolution, a redox initiation composition (2 g of hydrogen peroxide, 0.9g of vitamin C) and 1.5g of mercaptopropionic acid are used as chain transfer agents to initiate polymerization of monomers, and the reaction temperature is controlled to be not more than 60 ℃. And after the temperature of the reaction material starts to be obviously reduced, obtaining the first intermediate solution.
(2) Adding a mixed solution of 250g of isopentenyl alcohol polyoxyethylene ether, 200g of polyoxyethylene acrylate, 65g of acrylic acid, 3.2g of glycidyl methacrylate and 433g of water into a first intermediate solution under stirring, stirring uniformly, respectively dropwise adding a redox initiation composition (2.5 g of hydrogen peroxide, 1.5g of vitamin C) and 1.8g of mercaptopropionic acid into the monomer mixed solution in batches to initiate polymerization reaction, controlling the temperature of a reaction system to be not more than 60 ℃, adjusting the pH value to be neutral after the temperature of the reaction system begins to drop, and then adding 0.6g of butanediamine and 200g of chitosan aqueous solution, wherein the chitosan aqueous solution contains 2.5g of chitosan with the viscosity of 200 mPa.s, continuously stirring, and cooling the temperature of the reaction system to room temperature to obtain a second intermediate solution.
(3) And adding a proper amount of water to adjust the solid content of the second intermediate solution to 40wt percent, so as to obtain the air-entraining type slurry agent mother liquor with the interpenetrating network structure.
Performance test: concrete external mortar-extracting composition and performance test thereof
Examples 6 to 10: and synthesizing the air-entraining type slurry stripping agent mother liquor with the interpenetrating network structure prepared in the embodiment 1-5 for later use. The air-entraining type slurry stripping agent mother liquor, the high-performance water-reducing mother liquor, the sodium gluconate, the defoaming agent and water are compounded according to the mass ratio of 3-10:22:1:0.02:69-78 to be used as a concrete external slurry stripping composition; and meanwhile, air entraining agents and thickening and pulp-extracting components which are commonly used in the market are selected as contrast, so that the compound concrete external-added pulp-extracting composition is obtained.
Comparative examples 1 to 4: the slurry-extracting composition of the comparison group is prepared by compounding the mother solution of the high-performance carboxylic acid water reducer, the triterpenoid saponin air entraining agent, the thickening agent, the sodium gluconate, the organosilicon defoamer and the water according to the mass ratio of 22:0-0.8:0-1:1:0.02:75.2-76.7.
The specific compositions and proportions of examples 6-10 and comparative examples 1-4 are shown in Table 1:
TABLE 1 raw materials and mass ratio of examples 6 to 10 and examples 1 to 4
Examples 6 to 10 and comparative examples 1 to 4 were incorporated into C30 concrete, and concrete trial experiments were performed on C30 concrete incorporating concrete admixture compositions of different compositions, the test methods were referred to GB/T50080-2016, the volume weights and the concrete block strengths at the ages of 7d and 28d were tested, and the results are shown in Table 2:
Table 2 concrete bulk weights and strength comparisons of concrete mix with different compositions of concrete slip compositions
As can be seen from Table 2, the concrete external mortar lifting composition obtained by compounding the air entraining type mortar lifting agent mother liquor and other components is mixed into concrete, so that the concrete hardening strength is not reduced while the plumpness of concrete mixture slurry is improved, the concrete volume weight is reduced and the compressive capacity is improved.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, i.e., the invention is not to be limited to the details of the invention.

Claims (9)

1. The air-entraining type pulp-extracting agent mother liquor is characterized in that the air-entraining type pulp-extracting agent mother liquor has a solid content of 35-45wt% and is prepared from the following raw materials in parts by mass:
5 to 50 parts of polyoxyethylene unsaturated macromer, 3 to 30 parts of unsaturated carboxylic acid or/and unsaturated anhydride, 0.3 to 6 parts of alpha-sodium alkenyl sulfonate, 0.003 to 7 parts of monoepoxy end-capped unsaturated compound, 0.001 to 2.5 parts of cross-linking agent, 0.3 to 1.5 parts of redox initiation composition, 0.3 to 1.5 parts of chain transfer agent and 0.5 to 91 parts of water;
Wherein the polyoxyethylene unsaturated macromer is at least one selected from allyl polyoxyethylene ether, methallyl polyoxyethylene ether, isopentenyl polyoxyethylene ether, polyoxyethylene acrylate, polyoxyethylene methacrylate and polyoxyethylene isopentenyl acrylate, and the polyoxyethylene unsaturated macromer has a number average molecular weight of 500-5000;
the monoepoxy-terminated unsaturated compound is at least one of allyl glycidyl ether, methallyl glycidyl ether, prenyl alcohol glycidyl ether, glycidyl acrylate, glycidyl methacrylate and prenyl acid glycidyl ester;
The cross-linking agent is And/or H 2N—X'—NH2, wherein R is H or CH 3, R 'is H or CH 3, X is (CH 2)n1 segment, (CH 2CH2O)n2 segment or ester segment), X' has (CH 2)n3 segment, (CH 2CH2O)n4 segment or ester segment), and n1, n2, n3, and n4 are integers.
2. The bleed air type slurry mother liquor according to claim 1, wherein the raw materials further comprise 0.01-1 part by mass of chitosan, and the viscosity of the chitosan is 10-500 mpa.s.
3. The bleed air type slurry stock solution of claim 1, wherein the cross-linking agent is selected from at least one of diethanol dimethacrylate, polyethylene glycol dimethacrylate, 1, 6-hexanediol dimethacrylate and 1, 6-hexanediol dimethacrylate, diallyl glycol ether, diallyl polyethylene glycol ether, ethylenediamine trisulfide, decylenediamine, and butanediamine.
4. The bleed air type slurry mother liquor according to claim 1, wherein the redox initiation composition comprises an oxidant and a reducing agent, the oxidant is ammonium persulfate and/or peroxide, the reducing agent is Fe 2+ and/or vitamin C, and the mass ratio of the oxidant to the reducing agent is 1.5-3.75:1.
5. The bleed air type slurry mother liquor according to claim 4, wherein the chain transfer agent is thioglycollic acid and/or mercaptopropionic acid, and the mass ratio of the chain transfer agent to the reducing agent is 1:1.2-4.
6. The bleed air type slurry mother liquor of claim 1, wherein said unsaturated carboxylic acid is selected from at least one of acrylic acid, methacrylic acid and maleic acid;
the unsaturated acid anhydride is at least one selected from the group consisting of acrylic anhydride, methacrylic anhydride and maleic anhydride.
7. A method for preparing the bleed air type pulp lifter mother liquor according to any one of claims 1 to 6, comprising the steps of:
(1) Dissolving 3-90% of polyoxyethylene unsaturated macromer, 5-75% of unsaturated carboxylic acid or/and unsaturated anhydride, 0-50% of monoepoxy end-capped unsaturated compound, 0-100% of alpha-sodium alkenyl sulfonate and part of cross-linking agent in proper water, adding 30-70% of redox initiation composition and 30-70% of chain transfer agent in batches at room temperature, controlling the temperature of a reaction system to be not more than 60 ℃, adding part of the cross-linking agent after the temperature of the reaction system begins to drop, and obtaining a solution of a first intermediate after the temperature of the reaction system begins to drop obviously, wherein the total adding amount of the cross-linking agent in the step (1) is 25-85%;
(2) Adding the rest of the polyoxyethylene-based unsaturated macromer, the unsaturated carboxylic acid or the unsaturated anhydride, the monoepoxy-terminated unsaturated compound, the alpha-sodium alkenyl sulfonate, part of the cross-linking agent and a proper amount of water into the first intermediate solution, adding the rest of the redox initiation composition and the chain transfer agent at 30 ℃, controlling the temperature of a reaction system to be not more than 60 ℃, adding the rest of the cross-linking agent after the temperature of the reaction system begins to drop, and cooling the temperature of the reaction system to room temperature to obtain a solution of a second intermediate;
(3) And regulating the solid content of the solution of the second intermediate to 35-45wt% to obtain the air-entraining type slurry agent mother liquor of the interpenetrating network structure.
8. The preparation method according to claim 7, wherein the raw materials further comprise 0.01-1 part by mass of chitosan, and the viscosity of the chitosan is 10-500 mpa.s;
The chitosan is added in at least one of the steps (1), (2) and (3).
9. A concrete external mortar composition comprising the bleed air type mortar agent mother liquor of any one of claims 1 to 6.
CN202411026904.1A 2024-07-30 2024-07-30 A kind of air-entraining pulping agent mother solution and its preparation method and application Pending CN118930758A (en)

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