CN105713164B - A kind of aliphatic water reducing agent prepared using stalk and preparation method thereof - Google Patents
A kind of aliphatic water reducing agent prepared using stalk and preparation method thereof Download PDFInfo
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- CN105713164B CN105713164B CN201610054456.5A CN201610054456A CN105713164B CN 105713164 B CN105713164 B CN 105713164B CN 201610054456 A CN201610054456 A CN 201610054456A CN 105713164 B CN105713164 B CN 105713164B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G16/00—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00
- C08G16/06—Block or graft polymers prepared by polycondensation of aldehydes or ketones on to macromolecular compounds
-
- 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
- C04B24/166—Macromolecular compounds comprising sulfonate or sulfate groups obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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Abstract
The present invention relates to the water reducer preparing technical field of architectural engineering, and in particular to a kind of aliphatic water reducing agent prepared using stalk and preparation method thereof.The product is prepared by steps such as stalk pickling, stalk modified aliphatic water reducing agents.Present invention improves existing bio-based water reducer product water-reducing rate it is low the defects of, the shortcomings of also overcoming the concrete disintegration occurred during aliphatic water reducing agent application, bleeding, retarding effect difference, the performance preferably feature of environmental protection and economy, are with better promotion prospects.The technology of the present invention advantage has：Effective utilization has been carried out to straw refuse resource；The shortcomings that improving existing aliphatic water reducing agent retarding effect difference, improve the application of aliphatic water reducing agent；It is optimized for the reaction condition in aliphatic water reducing agent preparation process and the ratio of reactant, the stability of product quality can be better ensured that, while reduces production cost.
Description
Technical field
The present invention relates to the water reducer preparing technical field of architectural engineering, and in particular to a kind of fat prepared using stalk
Race's water reducer and preparation method thereof.
Background technology
Water reducer kind in the market is more, have polycarboxylic-acid, fatty family, naphthalene system, sulfamate system and
The water reducer type such as modified lignin resin, the water-reducing effect of wherein poly carboxylic acid series water reducer is most notable, but as it is mainly prepared
Reducing increasingly for raw material oil and riseing for price, its market price remains high；Naphthalene water reducer is in China's output
It is larger, its performance also comparative superiority, but byproduct big, while that pollution environment can be produced is consumed energy in production process, in addition such as
Improper measures can have a negative impact to environment and the mankind in fruit production；The preparation of sulfamate and modified lignin resin water reducer
Advantage of lower cost, but its water-reducing property all has much room for improvement.
Compared with other kinds of cement water reducing agent, aliphatic water reducing agent has water-reducing effect prominent, compatible with cement
Property the series of advantages such as good and cost performance height.The design feature of aliphatic water reducing agent, makes it possible its high performance.Cause
This, the research to aliphatic water reducing agent is an important directions in water reducer market.
There is the activity such as great amount of hydroxy group group in the macromolecular structure of biomass cellulose, easily send out under certain condition
Raw esterification or etherification reaction and be derivatized, some water-soluble cellulose derivatives show thickening, scattered, emulsification, it is solubilized into
The performances such as film, protecting colloid, this technique characteristic such as have raw material sources extensive, biodegradable, safe to use, therefore cellulose
Derivative is used widely in all trades and professions.
In building material field, also paid close attention to cellulose derivative as the research of water reducer, at present report
The raw material of preparation bio-based water reducer mainly have cellulose, hemicellulose and starch etc., method of modifying include carboxy methylation,
Carboxyethylation, alkyl sulfonic acid and Sulfation etc..
Agricultural crop straw is the chief component of biomass resource, and China is as large agricultural country, annual agricultural crop straw
Volume reach more than 700,000,000 tons, wherein 21% is wheat stalk.Change and intensive manufacture side with fuel in China's rural areas structure
The propulsion of formula, agricultural crop straw are used as traditional fuel, fertilizer and feed, only small part, and major part is
It is excluded outside the inner loop of agricultural production, causes a large amount of stalks to be placed in field as the discarded object of agricultural production and burn
Burn or heap abandoned, annual grain harvest season the whole nation there are about 200,000,000 tons of stalks and be incinerated.In the world using agricultural crop straw by the use of as
The strategic industry of 21 century Renewable Energy Development resource, the recycling of agricultural crop straw primarily focus on chemical industry and built
Build the exploitation of material.But aliphatic water reducing agent is directly prepared using agricultural crop straw, there is not yet preferably testing and having
There is the report of preferable application effect.
The content of the invention
Present invention aims at provide it is a kind of using discarded object agricultural crop straw prepared by aliphatic water reducing agent, so as to
To provide new possibility for the recycling of agricultural crop straw.
The technical solution used in the present invention is as described below.
A kind of aliphatic water reducing agent prepared using stalk, is prepared by following steps：
（1）Stalk is pre-processed, the stalk is maize straw and/or wheat stalk；
After stalk is crushed, diluted acid is added, after soaking 18 ~ 36h after being uniformly mixed（It is preferred that 24h）, filter and with clearly
It is standby after water flushing stalk to neutrality；
In terms of mass concentration, the diluted acid is 1 ~ 3% sulfuric acid or 3 ~ 5% hydrochloric acid；
Stalk：The g of the solid-to-liquid ratio of diluted acid=1：8~12 mL；
（2）Stalk modified aliphatic water reducing agent is prepared, detailed process is：
First, water is added in a kettle, then adds sodium sulfite, is dissolved, and stirring or auxiliary can be used during dissolving
Heating measures make it fully dissolve；
Second, acetone, 8 ~ 12min of sulfonation are added in the sodium sulfite solution after above-mentioned dissolving；Then step is added（1）
In pretreated stalk, 20 ~ 40min of stirring reaction；
3rd, state formaldehyde is slowly added in solution then up, control the adding speed of formaldehyde in 0.1 ~ 0.2mL/s, this
Sample do on the one hand it is fully reacted, on the other hand prevent its volatilization, it may be necessary in formaldehyde adding tube and its nearby plus
Condensation reflux unit reduces its volatilization, after addition, treats that temperature rises to 90 DEG C~95 DEG C and reacts 1 ~ 2h again；
Natural cooling after the completion of reaction, you can obtain pH value as neutral dark high-molecular copolymer solution, i.e. this reaction
Prepared aliphatic water reducing agent；
With molar ratio computing, water：Sodium sulfite：Acetone：Formaldehyde=10：0.3~0.5：0.8~1.0：3.5~4.5；
By quality ratio, water：Stalk=15 ~ 16 after pretreatment：1；
The preparation method of the aliphatic water reducing agent prepared using stalk, specifically includes following steps：
（1）Stalk is pre-processed, the stalk is maize straw and/or wheat stalk；
After stalk is crushed, diluted acid is added, after soaking 18 ~ 36h after being uniformly mixed（It is preferred that 24h）, filter and with clearly
It is standby after water flushing stalk to neutrality；
In terms of mass concentration, the diluted acid is 1 ~ 3% sulfuric acid or 3 ~ 5% hydrochloric acid；
Stalk：The g of the solid-to-liquid ratio of diluted acid=1：8~12 mL；
（2）Stalk modified aliphatic water reducing agent is prepared, detailed process is：
First, water is added in a kettle, then adds sodium sulfite, is dissolved, and stirring or auxiliary can be used during dissolving
Heating measures make it fully dissolve；
Second, acetone, 8 ~ 12min of sulfonation are added in the sodium sulfite solution after above-mentioned dissolving；Then step is added（1）
In pretreatment after stalk, 20 ~ 40min of stirring reaction；
3rd, state formaldehyde is slowly added in solution then up, control the adding speed of formaldehyde in 0.1 ~ 0.2mL/s, this
Sample do on the one hand it is fully reacted, on the other hand prevent its volatilization, it may be necessary in formaldehyde adding tube and its nearby plus
Condensation reflux unit reduces its volatilization, after addition, treats that temperature rises to 90 DEG C~95 DEG C and reacts 1 ~ 2h again；
Natural cooling after the completion of reaction, you can obtain pH value as neutral dark high-molecular copolymer solution, i.e. this reaction
Prepared aliphatic water reducing agent；
With molar ratio computing, water：Sodium sulfite：Acetone：Formaldehyde=10：0.3~0.5：0.8~1.0：3.5~4.5；
By quality ratio, water：Stalk=15 ~ 16 after pretreatment：1.
Measurement result shows, the paste flowing degree of the aliphatic water reducing agent prepared by the above method has in 240mm or so
Preferable application prospect.
In general, the present invention compared to other kinds of water reducer product in the prior art for, have it is following more
Obvious technical advantage：
（1）Effective utilization has been carried out to straw refuse resource, resource has been saved and has promoted the development of environmental protection cause；
（2）The shortcomings that improving existing aliphatic water reducing agent retarding effect difference, improve the application of aliphatic water reducing agent
Scope；
（3）It is optimized for the reaction condition in aliphatic water reducing agent preparation process and the ratio of reactant, can
The stability of product quality is better ensured that, while reduces production cost.
In general, the present invention not only improves existing biology using the aliphatic water reducing agent product prepared by stalk
The defects of base water reducer product water-reducing rate is low, also overcomes the concrete disintegration occurred during aliphatic water reducing agent application, bleeding, delay
The shortcomings of solidifying effect difference, the performance preferably feature of environmental protection and economy, it is with better promotion prospects.
Brief description of the drawings
Fig. 1 is the infrared spectrum detection figure of the aliphatic water reducing agent prepared by comparative example；
Fig. 2 is that the infrared spectrum of the aliphatic water reducing agent prepared using stalk prepared by embodiment 1 detects figure.
Embodiment
With reference to embodiment the present invention will be further explained explanation.Before specific embodiment is introduced, first to this
Involved partial material situation is briefly described as follows in invention.
Stalk used comes from the Suburb of Zhengzhou farmland maize straws harvested in 2015 and Wheat Straw in following embodiments
Stalk, after the stalk harvested is dried, by dry stalk（Root, stem, leaf including stalk）Crushed；Take stalk after crushing
Sample is measured, as a result as follows.
The elementary analysis of stalk and Contents of Main Components data：
In project analysis measure in upper table, constituent content mensure elemental analyser, its detector is Thermal Conductivity
（TCD）, ash content test provided according to GB/T 212-2008 in quick determination method of ash content, determination of moisture method uses indirect method,
The assay method of cellulose, hemicellulose and lignin is determined using Van Soest methods.
Embodiment 1
The aliphatic water reducing agent prepared using stalk that the present embodiment is provided, is prepared especially by following steps：
（1）Stalk is pre-processed, the stalk is wheat stalk；
By stalk after the crushing of 40 mesh sieves, 20g is taken to add the sulfuric acid that 200mL mass concentrations are 2% as test specimen, stir
Mix it is well mixed after soak 24h, filter and rinsed with clear water standby after stalk to neutrality；
（2）Preparative aliphatic water reducing agent, detailed process are：
First, 10 mol water is added in a kettle, then adds 0.4 mol sodium sulfite, fully dissolving, dissolving
Shi Caiyong strong agitation modes aid in accelerating the dissolving of sodium sulfite；
Second, 0.9mol acetone, sulfonation 10min are added in the sodium sulfite solution after above-mentioned dissolving；Then add
Step（1）Stalk 12g after middle pretreatment, stirring reaction 30min；
3rd, 4.5 mol formaldehyde is slowly added dropwise in above-mentioned reaction solution（Formalin, mass concentration 40%）, control
The adding speed of formaldehyde processed reduces the volatilization of formaldehyde, after addition, treats temperature liter in 0.1ml/s, unlatching condensation reflux unit
1.5h is reacted again to 90 DEG C~95 DEG C；
Natural cooling after the completion of reaction, you can obtain pH value as neutral dark high-molecular copolymer solution, i.e., it is of the invention
Prepared aliphatic water reducing agent.
Embodiment 2
The aliphatic water reducing agent prepared using stalk that the present embodiment is provided, its preparation method is with embodiment 1, only with regard to portion
Divide material type and dosage to do appropriate adjustment, be described as follows.
The present embodiment employs maize straw and prepares aliphatic water reducing agent, and mass concentration is used in stalk pretreatment as 4%
Hydrochloric acid carries out immersion treatment；In aliphatic water reducing agent preparation process, with molar ratio computing, water：Sodium sulfite：Acetone：Formaldehyde=
10：0.3：0.8：4；Stalk dosage is 11.25g after pretreatment；Other undeclared situations are the same as embodiment 1.
Comparative example
The specific performance using stalk as the aliphatic water reducing agent prepared by raw material provided to illustrate the invention, inventor
Based on embodiment 1, aliphatic water reducing agent is prepared for as a comparison case using same procedure, it is distinguished to essentially consist in and is not added with
Stalk is as raw material, other reaction condition all sames.
Infrared spectrum detection is carried out respectively to the aliphatic water reducing agent prepared by embodiment 1 and comparative example.Infrared spectrum is examined
Instrument is the FT-IR of Nicolet 380 during survey, during detection, first by aliphatic water reducing agent product after ethanol precipitating mistake
Pulvis is made in filter, drying, then does infrared spectrum analysis with pellet technique.
Testing result is respectively as shown in Fig. 2, Fig. 1, and the abscissa in figure is wave number, and different functional groups have respective characteristic wave
Number, ordinate are the absorption intensity of different functional groups.
In Fig. 1, assignments are：Wave number is in 3431cm-1Locate the stretching vibration peak for hydroxyl, 2926.90cm-1Locate be
The stretching vibration peak of C-H on aliphatic molecules chain, small peak 2227.34cm-1Locate the carbon carbon stretching vibration peak for unsaturated bond,
1607.44cm-1Locate as carbonyl absorption peak, 1414.07cm-1And 1384.29cm-1Locate the flexural vibrations peak for C-H,
1180.58cm-1And 1041.15cm-1Locate the stretching vibration peak for S-O, and 771.97cm at fingerprint region-1、605.07cm-1With
525.55cm-1The peak at place is that bending hydrocarbon on unsaturated carbon shakes peak.It can thus be seen that contain in the molecule of polycondensation product
The functional group such as sulfonic group, hydroxyl, carbonyl and unsaturated carbon, wherein hydroxyl and sulfonic group are strong hydrophilic groups.
In fig. 2,3442.33cm-1It is constant to locate the stretching vibration peak position of hydroxyl, but by the shadow of hydroxyl on stalk
Ring, peak area increase；2100.99cm-1For the carbon carbon stretching vibration peak of unsaturated bond, compare Fig. 1 and offset, while stalk
The influence peak area increase of upper unsaturated bond；1642.98cm-1The carboxyl peak change at place is little；1351.46cm-1Saturation C-H
Flexural vibrations peak weakened, while 1181.99cm-1And 1042.98cm-1S-O stretching vibration peak weakened, its
His peak unobvious.
Influence situation to aliphatic water reducing agent functional group after addition stalk can be substantially analyzed from above-mentioned contrast,
I.e.：The peak intensity of obtained water reducer functional group diminishes after addition stalk, and this is primarily due to the difficult degradation of stalk cellulose
Reactivity.Although not seeing the presence of stalk from reaction resulting solution surface, still there is the unreacted residual stalk in part
Adsorb on reaction product surface, diminish so as to ultimately result in peak intensity.
Further to detect the specific performance of the aliphatic water reducing agent provided by the present invention using prepared by stalk, invention
People has carried out specific detection, correlation examination to the performance of the aliphatic water reducing agent prepared by above-described embodiment 1, embodiment 2, comparative example
It is as follows to test briefing.
First, according to《GB 8076-2008 concrete admixtures》It is prepared for concrete；Prepared concrete, coagulation
The match ratio of soil is C (cement)：S (stone)：G (sand)：W (water)=1：2.11：3.5：0.48, its ratio of mud is 0.29, water reducer
Addition is 1.5%, and cement used is P.O42.5R（The production of joint Cement Group Co., Ltd of China）；
Aliphatic water reducing agent prepared in embodiment 1, embodiment 2, comparative example is respectively adopted in water reducer, employs simultaneously
Commercially available aliphatic high-efficiency water reducing agent product is as control（Water reducer manufacturer：Ruian Trade Co., Ltd. of Ningyang, product are
Liquid sepia viscous fluid, other performances see the table below）, while the concrete for being not added with water reducer is employed as blank control.
To the flowing degree of net paste of cement of concrete according to《Methods for testing uniformity of concrete admixture》（GB/T 8077-
2000）Tested；
Water reducer water-reducing rate assay method according to《Concrete admixture》（GB8076-2008）Standard is carried out, with following public affairs
Formula is calculated：
WR=[(W0- W1)/W0] × 100%, wherein, WRFor water-reducing rate（%）, W0On the basis of concrete unit consumption of water（kg/
m3）, W1To mix Fresh Concrete with Admixtures unit consumption of water（kg/m3）；
Water reducer solids content and slump determination test according to《Concrete admixture》（GB8076-2008）Standard is entered
OK, error not more than 0.3%；Wherein solids content is expressed as " XGu", calculated by following equation：
XGu=[(M2-M0)/(M1-M0)] × 100%, wherein, XGuFor solids content (%), M0For the quality (g) for bottle of weighing, M1
For measuring cup plus the quality (g) of style, M2For the quality (g) of sample after measuring cup plus drying；
In compression strength detection mix, shaping, measurement and data processing etc. of concrete according to《Normal concrete mechanics
Performance test method standard》（GB/T50081-2002）Carry out, test the concrete compression strength of 3 days, 7 days and 28 days respectively.
Shown in the measurement result table specific as follows of each group：
As can be seen from the above table, the present invention utilizes the aliphatic water reducing agent prepared by stalk compared with comparative example, although
There is a certain distance in performance, but still suitable with the performance of existing commercially available aliphatic water reducing agent, and because stalk cost is low
It is honest and clean, thus aliphatic water reducing agent provided by the present invention still has preferably realistic meaning.
In addition, measurement result is also shown that the process in the aliphatic water reducing agent provided using embodiment 1 or embodiment 2
In, or so late half an hour more equal than the presetting period for adding other aliphatic water reducing agents in presetting period, thus in its compression strength
Utilizability is improved on the premise of meeting engine request, is more convenient for constructing.
Claims (4)
1. a kind of aliphatic water reducing agent prepared using stalk, it is characterised in that the product is prepared by following steps：
（1）Stalk is pre-processed, the stalk is maize straw and/or wheat stalk；
After stalk is crushed, diluted acid is added, 18 ~ 36h is soaked after being uniformly mixed, filters and rinses stalk to neutrality with clear water
It is standby afterwards；
In terms of mass concentration, the diluted acid is 1 ~ 3% sulfuric acid or 3 ~ 5% hydrochloric acid；
Stalk：The g of the solid-to-liquid ratio of diluted acid=1：8~12 mL；
（2）Stalk modified aliphatic water reducing agent is prepared, detailed process is：
First, water is added in a kettle, then adds sodium sulfite, is dissolved；
Second, acetone, 8 ~ 12min of sulfonation are added in the sodium sulfite solution after above-mentioned dissolving；Then step is added（1）In it is pre-
Stalk after processing, 20 ~ 40min of stirring reaction；
3rd, formaldehyde is added into above-mentioned solution, 90 DEG C~95 DEG C are reacted 1 ~ 2h again；
With molar ratio computing, water：Sodium sulfite：Acetone：Formaldehyde=10：0.3~0.5：0.8~1.0：3.5~4.5；
By quality ratio, water：Pretreated stalk=15 ~ 16：1.
2. the aliphatic water reducing agent prepared as claimed in claim 1 using stalk, it is characterised in that with molar ratio computing, water：Sulfurous
Sour sodium：Acetone：Formaldehyde=10：0.4：0.9：4.5.
3. the preparation method of the aliphatic water reducing agent prepared described in claim 1 using stalk, it is characterised in that this method is specific
Comprise the following steps：
（1）Stalk is pre-processed, the stalk is maize straw and/or wheat stalk；
After stalk is crushed, diluted acid is added, 18 ~ 36h is soaked after being uniformly mixed, filters and rinses stalk to neutrality with clear water
It is standby afterwards；
In terms of mass concentration, the diluted acid is 1 ~ 3% sulfuric acid or 3 ~ 5% hydrochloric acid；
Stalk：The g of the solid-to-liquid ratio of diluted acid=1：8~12 mL；
（2）Stalk modified aliphatic water reducing agent is prepared, detailed process is：
First, water is added in a kettle, then adds sodium sulfite, is dissolved；
Second, acetone, 8 ~ 12min of sulfonation are added in the sodium sulfite solution after above-mentioned dissolving；Then step is added（1）In it is pre-
Stalk after processing, 20 ~ 40min of stirring reaction；
3rd, formaldehyde is added into above-mentioned solution, 90 DEG C~95 DEG C are reacted 1 ~ 2h again；
With molar ratio computing, water：Sodium sulfite：Acetone：Formaldehyde=10：0.3~0.5：0.8~1.0：3.5~4.5；
By quality ratio, water：Pretreated stalk=15 ~ 16：1.
4. as claim 3 states the preparation method of the aliphatic water reducing agent prepared using stalk, it is characterised in that the addition of formaldehyde
Speed is in 0.1 ~ 0.2mL/s.
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| CN106279574A (en) * | 2016-08-08 | 2017-01-04 | 华北水利水电大学 | A kind of polycarboxylate water-reducer utilizing straw modification and preparation method thereof |
| CN109836542A (en) * | 2019-02-21 | 2019-06-04 | 天水师范学院 | A kind of stalk-starch conversion synthesizes the industrialization system and preparation method of inexpensive collapse protection type water-reducing agent |
| CN111592662B (en) * | 2019-02-21 | 2022-02-22 | 天水师范学院 | Preparation method and device of sulfonated-hydroxymethylated modified straw-based water reducing agent |
| CN109704613B (en) * | 2019-02-21 | 2021-08-27 | 天水师范学院 | Preparation method and application of straw-starch-based composite sulfonated water reducing agent |
| CN109678382B (en) * | 2019-02-21 | 2021-08-27 | 天水师范学院 | Preparation method and application of ester ether sulfonated composite water reducing agent based on straw modification |
| CN110606691A (en) * | 2019-10-17 | 2019-12-24 | 江苏兆佳建材科技有限公司 | Concrete high-efficiency water reducing agent and preparation method thereof |
| CN114524881A (en) * | 2022-03-28 | 2022-05-24 | 华北水利水电大学 | Method for preparing cellulose-based water reducer by using straws |
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| CN1115310C (en) * | 1998-06-20 | 2003-07-23 | 贵州工业大学 | High-efficient wet-process cement raw slurry thinning agent |
| CN101337789A (en) * | 2008-08-12 | 2009-01-07 | 姜庆梅 | Method for preparing water reducing agent by condensation and modification of ryegrass alkali lignin |
| CN101531479A (en) * | 2009-04-03 | 2009-09-16 | 南京瑞迪高新技术公司 | Method for preparing low cost aliphatic high efficiency water reducing agent |
| CN104119025B (en) * | 2014-08-11 | 2017-02-15 | 山东华森混凝土有限公司 | Water-retaining, thickening and reinforcing additive for cement mortar and cement mortar containing additive |
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