CN108675665A - A kind of preparation method of slow-release concrete water-reducing agent - Google Patents

A kind of preparation method of slow-release concrete water-reducing agent Download PDF

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CN108675665A
CN108675665A CN201810618861.4A CN201810618861A CN108675665A CN 108675665 A CN108675665 A CN 108675665A CN 201810618861 A CN201810618861 A CN 201810618861A CN 108675665 A CN108675665 A CN 108675665A
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slow
parts
reducing agent
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CN108675665B (en
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任祥生
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SHANGHAI HONGYUN NEW BUILDING MATERIAL Co.,Ltd.
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Shandong Iba Intellectual Property Operation Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/16Sulfur-containing compounds
    • C04B24/161Macromolecular compounds comprising sulfonate or sulfate groups
    • C04B24/163Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F289/00Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/302Water reducers

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention belongs to building material technical fields, and in particular to a kind of preparation method of slow-release concrete water-reducing agent.The preparation method of the slow-release concrete water-reducing agent is:Temperature of reaction kettle is controlled at 80 DEG C, 100 parts of water are added into reaction kettle, weigh certain mass than Poplar Powder, maleic anhydride, sodium sulfanilate and BPO be added in reaction kettle, after reacting 3h, the concentrated sulfuric acid is added, after insulation reaction 2h, add some foaming agents and foaming control agent, after reacting 1h, solution PH is adjusted, solvent is spin-dried for and takes in right amount, a certain proportion of nano silicon dioxide, modified calcium carbonate, silane coupling agent is added, antioxidant grinds 30 minutes, obtains a kind of slow-release concrete water-reducing agent at room temperature;The present invention adds the nano silicon dioxide, modified calcium carbonate, silane coupling agent centainly matched by the modification sulphonation to Poplar Powder so that water-reducing agent has certain slow release effect, and simple production process, cost is relatively low.

Description

A kind of preparation method of slow-release concrete water-reducing agent
Technical field
The invention belongs to building material technical fields, and in particular to a kind of preparation side of slow-release concrete water-reducing agent Method.
Background technology
104119027 B of Chinese patent application CN disclose a kind of retardation water reducing agent, are mixed by the raw material of following parts by weight It closes:β-naphthalenesulfonate formaldehyde condensation compound 35-45, sulfonated acetone-formaldehyde condensation products 20-30, hydroxypropyl methyl fiber Plain 10-15, casein 6-12, saltcake 3-6, sulfonated coal tar 4-8, borax 2-4, calcium hydroxide 5-10, activated sludge 8- 14, prodan 5-10, oil foot 2.5-4.5, tartaric acid 2-3, zinc molybdate 3-5, triethyl phosphate 4-6, maltodextrin 2- 4, methylpropene sodium sulfonate 4-8, auxiliary agent 3-6.The retarding effect of the invention water-reducing agent is good, and setting time can extend 2-4 Hour, water-reducing rate 15%-20% can substantially improve the workability of concrete, improve every mechanical property of concrete, It is good to various cement adaptabilities, reinforcing bar non-corroding is acted on, can be used for various reinforced concrete works, but the technique is more multiple Miscellaneous, raw material mostly undoubtedly increases cost.
104119021 A of Chinese patent application CN have disclosed a kind of high efficiency water reducing agent, by following heavy
The raw material of amount part mixes:β-naphthalenesulfonate formaldehyde condensation compound 50-60, polyethylene glycol monomethyl ethermethacrylic acid esters 20-30, calcium lignosulfonate 15-25, ethylene oxide-propylene oxide copolymer 10-15, trehalose 2-4, silicone powder 1.5- 2.5, shale ashes 4-8, sodium hydrogensulfite 2.5-4.5, polyethylene glycol oxide 5-10, aluminium triphosphate 8-14, cocounut oil acyl diethyl Hydramine 2-3, dinonyl naphthalene sulfonate barium 1-2, methenamine 2-3, auxiliary agent 3-5.Water-reducing agent water-reducing rate of the present invention is high, mobility It is good, concrete flowability and workability are can obviously improve, early strong effect is notable after final set, can increase substantially concrete each age Intensity, be suitable for all kinds of concrete.
It can be seen that sustained-release water reducing agent development is slower, therefore a kind of research and development of sustained-release water reducing agent seem particularly heavy It wants.
Invention content
Of the existing technology to overcome the problems, such as, the present invention provides a kind of preparation side of slow-release concrete water-reducing agent Method, water-reducing agent, which is made, has certain slow release effect, and simple production process, cost is relatively low.
The present invention solve its technical problem the technical solution adopted is that:Invent a kind of system of slow-release concrete water-reducing agent Preparation Method, which is characterized in that the preparation method of the slow-release concrete water-reducing agent is:
(1)Temperature of reaction kettle is controlled at 80 DEG C, 100 parts of water are added into reaction kettle, it is 100-120 to weigh mass ratio:20-25: 25-30:Poplar Powder, maleic anhydride, sodium sulfanilate and the BPO of 1-1.5 is added in reaction kettle, after reacting 3h, in high speed Under stirring, reaction temperature reduces by 10 DEG C, is added dropwise the concentrated sulfuric acid in 1h, after insulation reaction 2h, adds 0.5-0.8 parts of foaming Agent and 0.2-0.3 parts of foaming control agents after reacting 1h, adjust solution PH, after being spin-dried for solvent with sodium carbonate/bicarbonate buffer solution It stands;
(2)Take 60-80 parts of steps(1)5-8 parts of nano silicon dioxides, 8-10 parts of modified calcium carbonates, 0.2- are added in obtained particle 0.5 part of silane coupling agent, 1-2 parts of antioxidants grind 30 minutes, obtain a kind of slow-release concrete diminishing at room temperature Agent.
Further, the preparation method of the modified calcium carbonate is that at room temperature, the polyvinyl chloride resin of butanone and hydroxyl is pressed Mass ratio 80-100:10-15 is placed in a kettle, is stirred 1h, is added 500-600 parts of ordinary calcium carbonate, stir speed (S.S.) control System after ten minutes, is added IPDI8-12 parts, stirs 15 minutes, obtain modified calcium carbonate, modified mobility in 300rpm, stirring It obviously increases, is convenient for following process.
Further, the preparation method of foaming control agent is that control temperature of reaction kettle is 70 DEG C, and rotating speed 200rpm weighs matter Amount is than being 80-100:10-15:The higher acrylic ester monomer of glass transition temperature, butyl acrylate, the acrylic acid of 2-4, It takes in 1/8 addition reaction kettle, adds 100 parts of ethyl acetate and 0.3-0.8 parts of initiators, after reacting half an hour, be gradually added dropwise Residual monomer heats up 5 DEG C, is taken out after insulation reaction 6h, obtains foaming control agent.
Further, the Poplar Powder grain size is in 80-100 mesh.
Further, the concentrated sulfuric acid rate of addition must be slow enough, and has to be added dropwise in high-speed stirred, avoids heat Amount aggregation.
Further, the effect of the PH conditioning agents is the PH of control system 7 ± 0.3.
Further, the antioxidant is, by mass fraction be 1-2 part glycerine, after the mixing of 2-3 parts of vitamin C The substance obtained.
Advantageous effect
1, nano silicon dioxide, modified calcium carbonate and silane coupled is added in the slow-release concrete water-reducing agent for preparing of the present invention After being ground, certain polymerisation has occurred on surface for agent so that water-reducing agent have slow release effect, when in use, with The increase used balances and is moved to the direction of release water-reducing agent particle, plays slow release effect, and the Water usage of the water-reducing agent It reduces, and concrete extended shelf-life, it is prevented from caking;
2, the present invention is by being added modified calcium carbonate, by adjusting the polyvinyl chloride resin ratio of butanone and hydroxyl, is carried out to calcium carbonate Modification so that modified calcium carbonate mobility obviously increases, and is convenient for following process.
Specific implementation mode
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, below in conjunction with experimental data, to this The preferred embodiment of invention is described in detail, to facilitate the technical staff to understand.
Embodiment 1
A kind of preparation method of slow-release concrete water-reducing agent includes the following steps:
(1)At room temperature, by the polyvinyl chloride resin of butanone and hydroxyl in mass ratio 100:12 place in a kettle, stir 1h, then add Entering 550 parts of ordinary calcium carbonate, stir speed (S.S.) control after ten minutes, is added IPDI10 parts, stirs 15 minutes in 300rpm, stirring, Obtain modified calcium carbonate;
(2)It is 70 DEG C, rotating speed 200rpm to control temperature of reaction kettle, and it is 90 to weigh mass ratio:11:3 glass transition temperature compared with High acrylic ester monomer, butyl acrylate, acrylic acid, take in 1/8 addition reaction kettle, be added 100 parts of ethyl acetate and 0.4 part of initiator after reacting half an hour, is gradually added dropwise residual monomer, heats up 5 DEG C, taken out after insulation reaction 6h, obtains foaming and adjusts Save agent;
(3)Temperature of reaction kettle is controlled at 80 DEG C, 100 parts of water are added into reaction kettle, it is 110 to weigh mass ratio:22:28:1.2 Poplar Powder, maleic anhydride, sodium sulfanilate and BPO are added in reaction kettle, after reacting 3h, under high velocity agitation, reaction temperature Degree reduces by 10 DEG C, is added dropwise the concentrated sulfuric acid in 1h, after insulation reaction 2h, adds 0.6 part of foaming agent and 0.25 part of foaming is adjusted Agent is saved, after reacting 1h, solution PH is adjusted with sodium carbonate/bicarbonate buffer solution, is spin-dried for solvent, takes 75 parts of obtained particles, add Enter 6 parts of nano silicon dioxides, 9 parts of modified calcium carbonates, 0.3 part of silane coupling agent, 1.5 parts of antioxidants grind 30 at room temperature Minute, obtain a kind of slow-release concrete water-reducing agent.
Embodiment 2
A kind of preparation method of slow-release concrete water-reducing agent includes the following steps:
(1)At room temperature, by the polyvinyl chloride resin of butanone and hydroxyl in mass ratio 90:11 place in a kettle, stir 1h, then add Enter 550 parts of ordinary calcium carbonate, stir speed (S.S.) control after ten minutes, is added IPDI8 parts, stirs 15 minutes, obtain in 300rpm, stirring To modified calcium carbonate;
(2)It is 70 DEG C, rotating speed 200rpm to control temperature of reaction kettle, and it is 100 to weigh mass ratio:13:3 glass transition temperature compared with High acrylic ester monomer, butyl acrylate, acrylic acid, take in 1/8 addition reaction kettle, be added 100 parts of ethyl acetate and 0.5 part of initiator after reacting half an hour, is gradually added dropwise residual monomer, heats up 5 DEG C, taken out after insulation reaction 6h, obtains foaming and adjusts Save agent;
(3)Temperature of reaction kettle is controlled at 80 DEG C, 100 parts of water are added into reaction kettle, it is 100 to weigh mass ratio:23:28:1.2 Poplar Powder, maleic anhydride, sodium sulfanilate and BPO are added in reaction kettle, after reacting 3h, under high velocity agitation, reaction temperature Degree reduces by 10 DEG C, is added dropwise the concentrated sulfuric acid in 1h, after insulation reaction 2h, adds 0.5 part of foaming agent and 0.25 part of foaming is adjusted Agent is saved, after reacting 1h, solution PH is adjusted with sodium carbonate/bicarbonate buffer solution, is spin-dried for solvent, takes 70 parts of obtained particles, add Enter 8 parts of nano silicon dioxides, 8 parts of modified calcium carbonates, 0.4 part of silane coupling agent, 1 part of antioxidant grinds 30 points at room temperature Clock obtains a kind of slow-release concrete water-reducing agent.
Embodiment 3
A kind of preparation method of slow-release concrete water-reducing agent includes the following steps:
(1)At room temperature, by the polyvinyl chloride resin of butanone and hydroxyl in mass ratio 85:10 place in a kettle, stir 1h, then add Enter 500 parts of ordinary calcium carbonate, stir speed (S.S.) control after ten minutes, is added IPDI8 parts, stirs 15 minutes, obtain in 300rpm, stirring To modified calcium carbonate;
(2)It is 70 DEG C, rotating speed 200rpm to control temperature of reaction kettle, and it is 100 to weigh mass ratio:11:2 glass transition temperature compared with High acrylic ester monomer, butyl acrylate, acrylic acid, take in 1/8 addition reaction kettle, be added 100 parts of ethyl acetate and 0.4 part of initiator after reacting half an hour, is gradually added dropwise residual monomer, heats up 5 DEG C, taken out after insulation reaction 6h, obtains foaming and adjusts Save agent;
(3)Temperature of reaction kettle is controlled at 80 DEG C, 100 parts of water are added into reaction kettle, it is 110 to weigh mass ratio:20:30:1 poplar Wood powder, maleic anhydride, sodium sulfanilate and BPO are added in reaction kettle, after reacting 3h, under high velocity agitation, reaction temperature 10 DEG C are reduced, is added dropwise the concentrated sulfuric acid in 1h, after insulation reaction 2h, 0.5 part of foaming agent is added and 0.2 part of foaming is adjusted Agent after reacting 1h, adjusts solution PH with sodium carbonate/bicarbonate buffer solution, is spin-dried for solvent, take 80 parts of obtained particles, be added 5 Part nano silicon dioxide, 10 parts of modified calcium carbonates, 0.25 part of silane coupling agent, 1 part of antioxidant grind 30 points at room temperature Clock obtains a kind of slow-release concrete water-reducing agent.
Embodiment 4
A kind of preparation method of slow-release concrete water-reducing agent includes the following steps:
(1)At room temperature, by the polyvinyl chloride resin of butanone and hydroxyl in mass ratio 100:15 place in a kettle, stir 1h, then add Entering 600 parts of ordinary calcium carbonate, stir speed (S.S.) control after ten minutes, is added IPDI12 parts, stirs 15 minutes in 300rpm, stirring, Obtain modified calcium carbonate;
(2)It is 70 DEG C, rotating speed 200rpm to control temperature of reaction kettle, and it is 100 to weigh mass ratio:15:2 glass transition temperature compared with High acrylic ester monomer, butyl acrylate, acrylic acid, take in 1/8 addition reaction kettle, be added 100 parts of ethyl acetate and 0.3 part of initiator after reacting half an hour, is gradually added dropwise residual monomer, heats up 5 DEG C, taken out after insulation reaction 6h, obtains foaming and adjusts Save agent;
(3)Temperature of reaction kettle is controlled at 80 DEG C, 100 parts of water are added into reaction kettle, it is 120 to weigh mass ratio:25:30:1.5 Poplar Powder, maleic anhydride, sodium sulfanilate and BPO are added in reaction kettle, after reacting 3h, under high velocity agitation, reaction temperature Degree reduces by 10 DEG C, is added dropwise the concentrated sulfuric acid in 1h, after insulation reaction 2h, adds 0.5 part of foaming agent and 0.3 part of foaming is adjusted Agent after reacting 1h, adjusts solution PH with sodium carbonate/bicarbonate buffer solution, is spin-dried for solvent, take 75 parts of obtained particles, be added 5 Part nano silicon dioxide, 10 parts of modified calcium carbonates, 0.25 part of silane coupling agent, 2 parts of antioxidants grind 30 points at room temperature Clock obtains a kind of slow-release concrete water-reducing agent.
Experimental analysis:
1, water-reducing agent performance test
Project Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Commercially available water-reducing agent
Water-reducing rate % 30 29 32 27 14
Compressive strength rate %(3d) 166 164 170 159 142
Compressive strength rate %(30d) 155 154 149 148 112
As can be seen from the table, the water-reducing agent that prepared by the present invention is substantially reduced the usage amount of water, and the product mechanical property prepared It is more excellent, routine use can be put into.
Finally illustrate, preferred embodiment above is only used to illustrate the technical scheme of the present invention and unrestricted, although logical It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be Various changes are made to it in form and in details, defined by claims of the present invention.

Claims (7)

1. a kind of preparation method of slow-release concrete water-reducing agent, which is characterized in that the slow-release concrete water-reducing agent Preparation method be:
(1)Temperature of reaction kettle is controlled at 80 DEG C, 100 parts of water are added into reaction kettle, it is 100-120 to weigh mass ratio:20-25: 25-30:Poplar Powder, maleic anhydride, sodium sulfanilate and the BPO of 1-1.5 is added in reaction kettle, after reacting 3h, in high speed Under stirring, reaction temperature reduces by 10 DEG C, is added dropwise the concentrated sulfuric acid in 1h, after insulation reaction 2h, adds 0.5-0.8 parts of foaming Agent and 0.2-0.3 parts of foaming control agents after reacting 1h, adjust solution PH, after being spin-dried for solvent with sodium carbonate/bicarbonate buffer solution It stands;
(2)Take 60-80 parts of steps(1)5-8 parts of nano silicon dioxides, 8-10 parts of modified calcium carbonates, 0.2- are added in obtained particle 0.5 part of silane coupling agent, 1-2 parts of antioxidants grind 30 minutes, obtain a kind of slow-release concrete diminishing at room temperature Agent.
2. a kind of preparation method of slow-release concrete water-reducing agent according to claim 1, which is characterized in that described The preparation method of modified calcium carbonate is, at room temperature, by the polyvinyl chloride resin of butanone and hydroxyl 80-100 in mass ratio:10-15 is placed In a kettle, 1h is stirred, 500-600 parts of ordinary calcium carbonate is added, stir speed (S.S.) control is stirred 10 minutes in 300rpm Afterwards, IPDI8-12 parts are added, stirs 15 minutes, obtains modified calcium carbonate, modified mobility obviously increases, and adds convenient for follow-up Work.
3. a kind of preparation method of slow-release concrete water-reducing agent according to claim 1, which is characterized in that foaming is adjusted The preparation method of section agent is that control temperature of reaction kettle is 70 DEG C, rotating speed 200rpm, and it is 80-100 to weigh mass ratio:10-15:2-4 The higher acrylic ester monomer of glass transition temperature, butyl acrylate, acrylic acid, take in 1/8 addition reaction kettle, then add Enter 100 parts of ethyl acetate and 0.3-0.8 parts of initiators, after reacting half an hour, residual monomer is gradually added dropwise, heats up 5 DEG C, heat preservation is anti- It is taken out after answering 6h, obtains foaming control agent.
4. a kind of preparation method of slow-release concrete water-reducing agent according to claim 1, which is characterized in that described Poplar Powder grain size is in 80-100 mesh.
5. a kind of preparation method of slow-release concrete water-reducing agent according to claim 1, which is characterized in that described Concentrated sulfuric acid rate of addition must be slow enough, and has to be added dropwise in high-speed stirred, and heat is avoided to assemble.
6. a kind of preparation method of slow-release concrete water-reducing agent according to claim 1, which is characterized in that the PH The effect of conditioning agent is the PH of control system 7 ± 0.3.
7. a kind of preparation method of slow-release concrete water-reducing agent according to claim 1, which is characterized in that described Antioxidant is the substance obtained after by mass fraction be 1-2 parts of glycerine, 2-3 parts of vitamin C mixes.
CN201810618861.4A 2018-06-15 2018-06-15 Preparation method of slow-release water reducer for concrete Active CN108675665B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110563373A (en) * 2019-08-29 2019-12-13 中国电力科学研究院有限公司 Dispersing agent for nano silicon dioxide and preparation method
CN112723901A (en) * 2021-01-28 2021-04-30 尹兵 Cement foamed concrete and preparation process thereof

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Publication number Priority date Publication date Assignee Title
CN101050081A (en) * 2006-04-07 2007-10-10 武汉市保立化学品有限责任公司 High performance water reducing agent in new type comb shaped molecular structure
FR2944023B1 (en) * 2009-04-01 2013-01-11 Chryso PROCESS FOR THE PREPARATION OF SUPERPLASTIFIERS
CN104177562A (en) * 2014-07-30 2014-12-03 广西红墙新材料有限公司 Slow-release high-adaptability polyester polycarboxylic acid water-reducing agent and preparation method and application thereof
CN106365494A (en) * 2016-08-30 2017-02-01 卓达新材料科技集团威海股份有限公司 Sodium sulfanilate-containing high-efficiency water reducing agent for 3D printing house slurry
CN107383289A (en) * 2017-07-31 2017-11-24 贵州凯襄新材料有限公司 A kind of polycarboxylate water-reducer and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101050081A (en) * 2006-04-07 2007-10-10 武汉市保立化学品有限责任公司 High performance water reducing agent in new type comb shaped molecular structure
FR2944023B1 (en) * 2009-04-01 2013-01-11 Chryso PROCESS FOR THE PREPARATION OF SUPERPLASTIFIERS
CN104177562A (en) * 2014-07-30 2014-12-03 广西红墙新材料有限公司 Slow-release high-adaptability polyester polycarboxylic acid water-reducing agent and preparation method and application thereof
CN106365494A (en) * 2016-08-30 2017-02-01 卓达新材料科技集团威海股份有限公司 Sodium sulfanilate-containing high-efficiency water reducing agent for 3D printing house slurry
CN107383289A (en) * 2017-07-31 2017-11-24 贵州凯襄新材料有限公司 A kind of polycarboxylate water-reducer and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110563373A (en) * 2019-08-29 2019-12-13 中国电力科学研究院有限公司 Dispersing agent for nano silicon dioxide and preparation method
CN112723901A (en) * 2021-01-28 2021-04-30 尹兵 Cement foamed concrete and preparation process thereof

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