CN104402292B - A kind of modified starch water reducer and preparation method thereof and using method - Google Patents
A kind of modified starch water reducer and preparation method thereof and using method Download PDFInfo
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- CN104402292B CN104402292B CN201410566540.6A CN201410566540A CN104402292B CN 104402292 B CN104402292 B CN 104402292B CN 201410566540 A CN201410566540 A CN 201410566540A CN 104402292 B CN104402292 B CN 104402292B
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Abstract
Open a kind of modified starch water reducer of the present invention and preparation method thereof and using method, with native starch as primary raw material, it is prepared for modified starch water reducer through peroxide degradation and with the graft copolymerization of mix monomer, there is water-reducing rate height, strong adaptability, the good feature good with other additive compatibility of retarding effect, water-reducing rate up to 26～28%, the slow setting time be 3～4 hours.Product prepared by the inventive method with poly carboxylic acid series water reducer with the use of time, the slow setting time that can increase poly carboxylic acid series water reducer reaches 4～5 hours, the phenomenons such as poly carboxylic acid series water reducer Mi Shui, isolation can be effectively prevented, improve poly carboxylic acid series water reducer to the adaptability containing argillaceous sand stone.
Description
[technical field]
The invention belongs to cement water reducing agent technical field, relate to a kind of a kind of modified starch water reducer for concrete construction and
Its preparation method and using method.
[background technology]
Cement water reducing agent is that modern concrete produces and has to use for a kind of additive in work progress, and its effect is to protect
Reduce water consumption during concrete mixing under conditions of card fresh concrete mobility, promote hydrated reaction of cement in concrete, carry
The intensity of high concrete and service life.The cement water reducing agent that China is currently mainly used is second filial generation water reducer naphthalene sulfonate first
Aldehyde condensate, sulfonated melamine compound condensation substance and sulfamate condensation substance, third generation water reducer poly carboxylic acid series water reducer is just
In popularization and application.The yield of second filial generation water reducer is generally about the 1% of cement weight, and water-reducing rate is generally less than 20%, slow
Solidifying time 1～2 hours, in it is prepared, employ formaldehyde as raw material so that exist with during the use of product aborning
Formaldehyde pollution, the advantage of second filial generation water reducer is that adaptability is stronger.The water-reducing rate of third generation water reducer may be up to more than 30%,
General volume is the 0.2% of cement weight, and preparation process does not use formaldehyde as raw material, does not has formaldehyde pollution, have volume few,
The feature of environmental protection, but have the drawback that and adaptability is existed for cement, more sensitive for the clay content in sandstone,
When sandstone clay content is more than 5%, its water-reducing rate and mobility be remarkably decreased, thus serious have impact on it and promote the use of.These
On the one hand the existence of problem promotes people constantly to improve poly carboxylic acid series water reducer and perfect, on the other hand also promotes people
The novel water reducer that constantly exploitation performance is more excellent.It should be noted that the second filial generation and the primary raw material of third generation water reducer simultaneously
Derive from petroleum resources, along with the minimizing day by day of petroleum resources, cause the Related product price based on petroleum resources continuous
Raise.Therefore, Renewable resource is utilized to prepare novel water-reducing rate height, strong adaptability, water reducer that the compatibility is good necessary.
[summary of the invention]
It is an object of the invention to provide a kind of modified starch water reducer and preparation method thereof and using method, to overcome existing diminishing
Problem existing for agent；This modified starch water reducer has that water-reducing rate height, strong adaptability, retarding effect be good and other additive
The feature that the compatibility is good.
To achieve these goals, the present invention adopts the following technical scheme that
The preparation method of a kind of modified starch water reducer, comprises the following steps:
(1) preparation of degradable starch: by mass parts, 20～25 parts of corn starchs are put into the reactor containing 80～90 parts of water,
Stirring is lower adds 1～2 part of sodium carbonate, heats to add 1～3 part of oxidant when 50～60 DEG C, continues to be warmed up to 90～95 DEG C,
Insulation reaction 3～obtain modified degradable starch solution for 3.5 hours；
(2) preparation of modified starch water reducer: modified degradable starch solution step (2) prepared cools to 80～85 DEG C,
In 30～40 points of kind, it is separately added into 10～14 parts of mix monomers and 2～4 parts of initiators, then proceedes to insulation reaction 3～4 hours,
Cooling to 30～40 DEG C, add 1～1.5 part of retarder, regulating pH value after stirring is 7.0～7.5 i.e. to obtain modified starch and subtract
Water preparation.
Preferably, described mix monomer by methacrylic acid, butyl acrylate, methylpropene sodium sulfonate and water according to weight ratio
10:1:0.5:5 forms.
Preferably, described initiator is ammonium ceric nitrate, hydrogen peroxide, Ammonium persulfate., potassium peroxydisulfate or sodium peroxydisulfate.
Preferably, step (1) point is separately added into 10～14 parts of mix monomers and 2～4 parts of initiators for 5 times in 30～40 points of kinds；
During interpolation, mix monomer and initiator are all divided into 5 parts, respectively add portion, add the above two and do not mix.
Preferably, using mass fraction in step (2) is 20% sodium hydroxide solution regulation pH value.
Preferably, described in step (1), oxidant is hydrogen peroxide, potassium permanganate or Ammonium persulfate..
Preferably, described in step (2), retarder is sodium citrate, sodium gluconate or sodium tripolyphosphate.
During use, the addition of this modified starch water reducer is the 0.5% of cement weight；Water-reducing rate be 26～28%, the slow setting time
It it it is 3～4 hours, it is adaptable to the sandstone clay content concrete less than 9%.
During use, add in cement and account for the modified starch water reducer of cement weight 0.1%～0.16% and account for cement weight
The poly carboxylic acid series water reducer of 0.15%～0.18%, water-reducing rate is 27%～29%, and the slow setting time is 4～5 hours, it is adaptable to sandstone contains
The mud amount concrete less than 7%.
Relative to prior art, the method have the advantages that the present invention carry out corn starch successively degrading and with mix
After monomer graft copolymerization be used as cement water reducing agent, when its solid volume is 0.5% according to cement weight water-reducing rate up to
25～27%, the slow setting time be 3～4 hours.Product prepared by the inventive method with poly carboxylic acid series water reducer with the use of time, can
Increase the slow setting time of poly carboxylic acid series water reducer along long 4～5 hours, it is possible to be effectively prevented poly carboxylic acid series water reducer Mi Shui, isolation
Etc. phenomenon, improve poly carboxylic acid series water reducer to the adaptability containing argillaceous sand stone.
[detailed description of the invention]
The preparation method of the present invention a kind of modified starch water reducer, comprises the following steps:
(1) preparation of degradable starch: 20～25 parts of corn starchs are put into the reactor containing 80～90 parts of water by mass parts,
Stirring is lower adds 1～2 part of sodium carbonate, heats to add 1～3 part of oxidant when 50～60 DEG C, continues to be warmed up to 90～95 DEG C,
Insulation reaction 3～obtain modified degradable starch solution for 3.5 hours.
(2) preparation of modified starch water reducer: the degradable starch solution of above-mentioned preparation is heated or cools to 80～85 DEG C, point
In 30～40 points of kinds, it is separately added into 10～14 parts of mix monomers and 2～4 parts of initiators for 5 times, then proceedes to insulation reaction 3～4 little
Time, cool to 30～40 DEG C, add 1～1.5 part of retarder, subtract and mix uniformly, be that 20% sodium hydroxide solution is adjusted with mass fraction
Joint pH value is 7.0～7.5 i.e. to obtain modified starch water reducer.
Mix monomer in step (2) by methacrylic acid, butyl acrylate, methylpropene sodium sulfonate and water according to weight ratio
10:1:0.5:5 forms；Initiator is ammonium ceric nitrate, hydrogen peroxide, Ammonium persulfate., potassium peroxydisulfate or sodium peroxydisulfate.Step (1)
Described in oxidant be hydrogen peroxide, potassium permanganate or Ammonium persulfate.；Described in step (2), retarder is sodium citrate, glucose
Acid sodium or sodium tripolyphosphate.
The present invention is first to using starch to carry out oxidative degradation, it is therefore an objective to reduces the relative molecular mass of native starch and changes structure,
Increase water solublity, then carry out radical graft copolymerization reaction with mix monomer, add retarder and obtain the water reducer of falling modified starch.
Starch is a kind of reproducible natural macromolecular material, is the chain polysaccharide connect with glycosidic bond by glucosyl group unit
Compound, containing three hydrophilic hydroxy group on its construction unit, containing ehter bond and branched structure on macromolecular chain, has work
For the architecture basics of water reducer, by degraded to improve water solublity, by being prepared for having branched with suitable mix monomer copolymerization
The modified starch water reducer of chain structure.
Embodiment 1
Plant the preparation method of modified starch water reducer, comprise the following steps:
(1) preparation of degradable starch: 20 parts of corn starchs are put into the reactor containing 80 parts of water, under stirring by mass parts
Adding 2 parts of sodium carbonate, heat to add 1 part of hydrogen peroxide when 50 DEG C, continue to be warmed up to 90 DEG C, insulation reaction obtains for 3 hours
To modified degradable starch solution.
(2) preparation of modified starch water reducer: heated by the degradable starch solution of above-mentioned preparation or cool to 80 DEG C, divides 5 times
In 30 points of kind, it is separately added into 10 parts of mix monomers and 4 parts of ammonium ceric nitrates, then proceedes to insulation reaction 3 hours, cool to 40 DEG C,
Add 1 part of sodium gluconate, subtract and mix uniformly, with mass fraction be 20% sodium hydroxide solution regulation pH value be 7.0 i.e. to be changed
Property starch water reducer.
Embodiment 2
The preparation method of a kind of modified starch water reducer, comprises the following steps:
(1) preparation of degradable starch: 25 parts of corn starchs are put into the reactor containing 90 parts of water, under stirring by mass parts
Adding 1 part of sodium carbonate, heat to add 2 parts of Ammonium persulfate .s when 60 DEG C, continue to be warmed up to 95 DEG C, insulation reaction 3.5 is little
Time obtain modified degradable starch solution.
(2) preparation of modified starch water reducer: heated by the degradable starch solution of above-mentioned preparation or cool to 85 DEG C, divides 5 times
In 30 points of kind, it is separately added into 12 parts of mix monomers and 2 parts of hydrogen peroxide, then proceedes to insulation reaction 3 hours, cool to 40 DEG C,
Add 1.5 parts of sodium tripolyphosphates, subtract and mix uniformly, with mass fraction be 20% sodium hydroxide solution regulation pH value be 7.5 i.e. to obtain
Modified starch water reducer.
Embodiment 3
The preparation method of a kind of modified starch water reducer, comprises the following steps:
(1) preparation of degradable starch: 22 parts of corn starchs are put into the reactor containing 85 parts of water, under stirring by mass parts
Adding 2 parts of sodium carbonate, heat to add 3 parts of potassium permanganate when 60 DEG C, continue to be warmed up to 95 DEG C, insulation reaction 3.5 is little
Time obtain modified degradable starch solution.
(2) preparation of modified starch water reducer: heated by the degradable starch solution of above-mentioned preparation or cool to 85 DEG C, divides 5 times
In 30 points of kind, it is separately added into 14 parts of mix monomers and 3 parts of Ammonium persulfate .s, then proceedes to insulation reaction 4 hours, cool to 30 DEG C,
Add 1.5 parts of sodium gluconates, subtract and mix uniformly, with mass fraction be 20% sodium hydroxide solution regulation pH value be 7.5 i.e. to obtain
Modified starch water reducer.
Embodiment 4
The preparation method of a kind of modified starch water reducer, comprises the following steps:
(1) preparation of degradable starch: 25 parts of corn starchs are put into the reactor containing 90 parts of water, under stirring by mass parts
Add 1 part of sodium carbonate, heat to add 2 parts of Ammonium persulfate .s when 60 DEG C, continue to be warmed up to 90 DEG C, insulation reaction 3 hours
Obtain modified degradable starch solution.
(2) preparation of modified starch water reducer: heated by the degradable starch solution of above-mentioned preparation or cool to 85 DEG C, divides 5 times
In 30 points of kind, it is separately added into 14 parts of mix monomers and 2 parts of potassium peroxydisulfates, then proceedes to insulation reaction 3 hours, cool to 30 DEG C,
Add 1 part of sodium citrate, subtract and mix uniformly, with mass fraction be 20% sodium hydroxide solution regulation pH value be 7 i.e. to obtain modification
Starch water reducer.
Embodiment 5
The preparation method of a kind of modified starch water reducer, comprises the following steps:
(1) preparation of degradable starch: 24 parts of corn starchs are put into the reactor containing 88 parts of water, under stirring by mass parts
Add 2 parts of sodium carbonate, heat to add 2 parts of potassium permanganate when 60 DEG C, continue to be warmed up to 90 DEG C, insulation reaction 3 hours
Obtain modified degradable starch solution.
(2) preparation of modified starch water reducer: heated by the degradable starch solution of above-mentioned preparation or cool to 85 DEG C, divides 5 times
In 30 points of kind, it is separately added into 14 parts of mix monomers and 4 parts of sodium peroxydisulfates, then proceedes to insulation reaction 3 hours, cool to 35 DEG C,
Add 1.5 parts of sodium tripolyphosphates, subtract and mix uniformly, with mass fraction be 20% sodium hydroxide solution regulation pH value be 7.5 i.e. to obtain
Modified starch water reducer.
Corn starch is carried out degrading and being used as cement water reducing agent after mix monomer graft copolymerization by the present invention successively,
When its solid volume is 0.5% according to cement weight, water-reducing rate up to 26～28%, the slow setting time be 3～4 hours, it is adaptable to sand
The stone clay content concrete less than 9%.Product prepared by the inventive method with poly carboxylic acid series water reducer with the use of time can improve
The easy bleeding that exists when being used alone polycarboxylate water-reducer, isolation and to the sensitivity containing argillaceous sand stone, when polycarboxylic-acid diminishing
The solid volume of agent is 0.15%～0.18% according to cement weight, and solid volume is 0.1%～0.16% cooperation according to cement weight simultaneously
Using this product, the slow setting time can be made to reach 4～5 hours, water-reducing rate is 27%～29%, it is possible to prevent the phenomenon such as Mi Shui, isolation
Generation, it is adaptable to sandstone clay content less than 7% concrete.
Claims (6)
1. the preparation method of a modified starch water reducer, it is characterised in that comprise the following steps:
(1) preparation of degradable starch: by mass parts, 20～25 parts of corn starchs are put into the reactor containing 80～90 parts of water,
Add 1～2 part of sodium carbonate, heat to add 1～3 part of oxidant when 50～60 DEG C, continue to be warmed up to 90～95 DEG C, insulation
React and within 3～3.5 hours, obtain modified degradable starch solution；
(2) preparation of modified starch water reducer: modified degradable starch solution step (2) prepared cools to 80～85 DEG C,
In 30～40 points of kind, it is separately added into 10～14 parts of mix monomers and 2～4 parts of initiators, then proceedes to insulation reaction 3～4 hours,
Cooling to 30～40 DEG C, add 1～1.5 part of retarder, regulating pH value after stirring is 7.0～7.5 i.e. to obtain modified starch and subtract
Water preparation；
Described mix monomer by methacrylic acid, butyl acrylate, methylpropene sodium sulfonate and water according to weight ratio 10:1:0.5:5
Composition；
Described initiator is ammonium ceric nitrate, hydrogen peroxide, Ammonium persulfate., potassium peroxydisulfate or sodium peroxydisulfate；
Described in step (1), oxidant is hydrogen peroxide, potassium permanganate or Ammonium persulfate.；
Described in step (2), retarder is sodium citrate, sodium gluconate or sodium tripolyphosphate.
The preparation method of a kind of modified starch water reducer the most according to claim 1, it is characterised in that in step (2)
Using mass fraction is 20% sodium hydroxide solution regulation pH value.
The preparation method of a kind of modified starch water reducer the most according to claim 1, it is characterised in that in step (1)
Divide in 30～40 points of kinds, be separately added into 10～14 parts of mix monomers and 2～4 parts of initiators for 5 times.
4. the modified starch prepared by preparation method of a kind of modified starch water reducer according to any one of claims 1 to 3 subtracts
Water preparation.
5. the using method of the modified starch water reducer described in claim 4, it is characterised in that be used in sandstone clay content and be less than
Time in the concrete of 9%, the addition of this modified starch water reducer is the 0.5% of cement weight；Water-reducing rate be 26～28%, slow setting
Time is 3～4 hours.
6. the using method of the modified starch water reducer described in claim 5, it is characterised in that be used in sandstone clay content and be less than
Time in the concrete of 7%, add in cement and account for the modified starch water reducer of cement weight 0.1%～0.16% and account for cement weight
The poly carboxylic acid series water reducer of 0.15%～0.18%, water-reducing rate is 27%～29%, and the slow setting time is 4～5 hours.
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| CN106517849B (en) * | 2015-09-10 | 2018-11-23 | 绵阳莫仕科技有限公司 | A kind of preparation method of oxidation-sulfonated starch water-reducing agent |
| CN105622161B (en) * | 2016-02-18 | 2018-04-20 | 陕西科技大学 | Cement base foamed light composite material and preparation method |
| CN109836540A (en) * | 2019-01-28 | 2019-06-04 | 济南大学 | One-step method prepares the high-efficiency water-reducing agent of poly-carboxylic acid of multi-arm branched structure |
| CN111592263B (en) * | 2019-02-21 | 2022-06-07 | 天水师范学院 | Synthesis process and device of retarding polycarboxylate superplasticizer |
| CN111574636B (en) * | 2019-06-12 | 2023-02-17 | 郑秀旗 | Starch maleate, preparation method and application thereof |
| CN110128081B (en) * | 2019-06-15 | 2021-06-15 | 广东腾基建设有限公司 | Concrete and preparation method thereof |
| CN111302695A (en) * | 2020-03-03 | 2020-06-19 | 深圳市三绿科技有限公司 | Composite early strength water reducing agent and preparation method and application thereof |
| CN113264710A (en) * | 2021-07-06 | 2021-08-17 | 浙江老虎山建材有限公司 | Starch-based high-efficiency water reducing agent and production process thereof |
| CN115368054B (en) * | 2021-10-22 | 2023-11-24 | 江苏兴砼弘业新材料有限公司 | Collapse-protecting water reducer and preparation method thereof |
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| JPS5575955A (en) * | 1978-11-28 | 1980-06-07 | Nisso Master Builders Kk | Fluidization of concrete |
| JP2002114550A (en) * | 2000-10-06 | 2002-04-16 | Terunaito:Kk | Admixing agent for soil cement fluid and method for controlling the fluid |
| CN1239540C (en) * | 2003-12-22 | 2006-02-01 | 中国农业科学院农业环境与可持续发展研究所 | Process for preparng simply dextrinized starch as powerful water absorbing and preserving agent |
| CN101173027A (en) * | 2007-11-30 | 2008-05-07 | 沈阳建筑大学 | Method for producing starch graft copolymer and uses thereof |
| CN101538351B (en) * | 2009-04-10 | 2010-12-29 | 陕西科技大学 | Method for preparing thickening and water holding agent for polycarboxylate type concrete water reducing agent |
| CN101704895B (en) * | 2009-11-16 | 2011-10-05 | 浙江大学 | Preparation method of highly viscous feeding pregelatinized starch |
| US20140005308A1 (en) * | 2011-03-18 | 2014-01-02 | Metabolic Explorer | Method for producing plasticized starch by using 1,3-propanediol and resulting composition |
| CN103387352B (en) * | 2013-07-25 | 2016-08-10 | 北京市建筑工程研究院有限责任公司 | A kind of screw extrusion method prepares biomass water reducer |
| CN103665274A (en) * | 2013-12-03 | 2014-03-26 | 沈阳化工大学 | Method for preparing sulfonated polycarboxylate water reducer grafted with glucose |
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