CN105542072B - A kind of concrete inner curing agent and preparation method thereof suitable for strong alkali environment - Google Patents
A kind of concrete inner curing agent and preparation method thereof suitable for strong alkali environment Download PDFInfo
- Publication number
- CN105542072B CN105542072B CN201610056919.1A CN201610056919A CN105542072B CN 105542072 B CN105542072 B CN 105542072B CN 201610056919 A CN201610056919 A CN 201610056919A CN 105542072 B CN105542072 B CN 105542072B
- Authority
- CN
- China
- Prior art keywords
- parts
- curing agent
- concrete
- concrete inner
- strong alkali
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- 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
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The present invention provides a kind of concrete inner curing agents suitable for strong alkali environment, are mainly made by following raw material：In terms of mass fraction, 4 12 parts of acrylic compounds, 40 120 parts of acrylamides, 0.05 0.2 parts of crosslinking agent, 0.02 0.10 parts of reducing agent, 0.05 0.2 parts of initiator, 100 300 parts of deionized water.Preparation method includes：After all raw materials are added be mixed evenly successively according to the sequence of deionized water, reducing agent, crosslinking agent, acrylic compounds, acrylamides, initiator, by keeping the temperature, standing, to get concrete inner curing agent after shearing, dry step.The interior curing agent of the embodiment of the present invention is highly suitable for the concrete of strong basicity, strong basicity resisting can be good, water absorbent rate is sufficiently lowered, the size that interior curing agent leaves hole after inside concrete releases water is reduced, does not interfere with the compaction rate and intensity of concrete itself.
Description
Technical field
The present invention relates to conservation technology fields in concrete, in particular to a kind of coagulation suitable for strong alkali environment
Curing agent and preparation method thereof in soil.
Background technology
High-strength concrete (HSC) characterized by low water binder ratio, with its excellent mechanical property in skyscraper, large span
It is used widely in bridge and key project.The HSC of low water binder ratio is since cementitious material is in hydration process and drying process
Generate sizable chemical shrinkage and self-constriction.When the contraction distortion of concrete suffers restraints, will be produced in inside concrete
Raw stress, once and internal stress is more than the tensile strength of concrete, concrete bracing will be caused, then seriously reduced mixed
The durability of soil is coagulated, or even causes serious engineering accident.The problem of Cracking of HSC has become the research of engineering circles and academia
Hot spot.Since HSC aquations and early stage powerful development are very fast, structure denser is sprinkled water, is watered, covering the external waters such as wet straw bag
Maintenance process is difficult to obtain good maintenance effect for HSC soil, can not significantly improve the shrinkage cracking problem of HSC.
At present research think most viable effective method be exactly from inside concrete compensation aquation needed for moisture, to coagulation
Soil is conserved, i.e., interior maintenance or Self-curing.Conserving material is a kind of material with porous structure in concrete, it has big
The pore or three-dimensional space net structure of amount can be acted on by external condition and the capillary of itself or functional group, adjustment and
Conversion stores and releases water function, plays the role of internal cistern.It is interior to support when there is water deficient during concrete hydrating
Moisture in protective material just feeds moisture needed for aquation, and the hydration reaction in maintenance system carries out.
In numerous interior curing agents, because super absorbent polymer (Super Absorbent Polymer, SAP) is containing big
Measure sulfonic group (- SO3 -), carboxyl (- COOH) and its salt (- COO-), amide groups (- CONH2), the strongly hydrophilics base such as hydroxyl (- OH)
Group can form hydrogen bond with water and quickly absorb a large amount of Free water and be in gel, in addition, SAP also has three-dimensional cross-linked net
Free water can be fixed on inside polymer network by network structure by swelling action, therefore this super absorbent polymer type conserves
Agent is widely used general.
Existing SAP deionized waters multipair greatly have higher water absorbent rate, but apply it to the coagulation of strong basicity environment
When native, inhaling the ability of strong base solution significantly reduces.Reason is that hydrated cementitious is formed by solution in strong basicity and exists high
Concentration high valence ion makes major impetus-osmotic pressure of polymer absorption reduce, and sharp decline occurs and release water, leads to concrete
Water-cement ratio becomes larger and working performance is unstable or even fails.Therefore, the more importantly strong basicity resisting energy and in highly basic for SAP
Water release rate in aqueous solution.
Patent of invention (CN201110195132.0) discloses a kind of system of water conservation Salt-resistant alkali-resistant concrete inner curing agent
Preparation Method, patent of invention (CN201410057770.X) disclose a kind of preparation of conserving material in alkali capacitive high moisture retention concrete
Method, still, the SAP grain sizes of both the above method production are respectively 75-150 μm and 50-200 μm, water absorbent rate 200-500
Times, after swelling, grain size can at least become original 5 times, and it is bigger than normal to release water back aperture, and larger hole is left in inside concrete,
To bring potential adverse effect factor to mechanical performance of concrete.
In view of this, special propose the present invention.
Invention content
The first object of the present invention is to provide a kind of concrete inner curing agent suitable for strong alkali environment, and described is applicable in
It solves the technical issues of appearing above in the concrete inner curing agent of strong alkali environment, is highly suitable for the concrete of strong basicity,
Can be good with strong basicity resisting, water absorbent rate is small, releases the advantages that water rate is low, and grain size is tiny, will not significantly increase water-binder ratio
And curing agent leaves the size of hole after inside concrete releases water in reducing, and does not interfere with the mechanical property etc. of concrete itself
Advantage.
The second object of the present invention is to provide a kind of system of the concrete inner curing agent suitable for strong alkali environment
Preparation Method, this method are simple and convenient to operate with preparation method, and it is excellent can completely to retain active ingredient of each raw material etc.
Point.
In order to realize that the above-mentioned purpose of the present invention, spy use following technical scheme：
An embodiment of the present invention provides a kind of concrete inner curing agents suitable for strong alkali environment, mainly by following raw material system
：In terms of mass fraction, 4-12 parts of acrylic compounds, 40-120 parts of acrylamides, crosslinking agent 0.05-0.2
Part, 0.02-0.10 parts of reducing agent, 0.05-0.2 parts of initiator, 100-300 parts of deionized water.
Super absorbent polymer (SAP) is because having the effect of quick water absorbing properties, good water lock and adjustable water absorbent rate etc.
Advantage, care field is widely used general in concrete, but SAP in the prior art deionized waters multipair greatly have it is higher
Water absorbent rate, but when applying it to the concrete of strong basicity environment, interior maintenance effect is significantly reduced, and is traced it to its cause：SAP
(after concrete mixing a few minutes, concrete system pH value increases to 12 or so when under the conditions of strong alkali environment.), alkaline resistance properties is not
Good, the rapid dehydration of meeting causes water-binder ratio to become larger, and secondly grain size is inclined after the SAP water absorption and swellings of big grain size high water absorption multiplying power
Greatly, after leaving larger hole after inside concrete releases water, the application performances such as intensity and the compactness of concrete can be influenced.
The present invention in order to solve these technical problems that super absorbent polymer itself contains conscientiously, it is formulated carried out into
The improvement of one step makes the ratio of amide groups and carboxylic acid group in its molecular structure to achieve the purpose that redesign SAP molecular structures
Control is in 9-20:1, to enhance its strong basicity resisting performance, and its water absorbent rate can be down between 10-45, released water rate and (released water
The SAP of rate=(quality after the SAP mass-of water absorption and swelling is impregnated 48 hours in saturated calcium hydroxide aqueous solution) ÷ water absorption and swellings
Quality * 100%) be reduced to 44% hereinafter, and can absorb water and release repeatedly water, sharp decline and color change do not occur for SAP
The phenomenon that；It is crushed to granularity D97Less than 45 μm hereinafter, to release water back aperture bigger than normal and then can influence to mix to thoroughly solve
The problem of performance for coagulating soil, occurs, and concrete inner curing agent of the invention has fine strong basicity resisting energy, has in concrete
Good adaptability.Of course for the change for realizing internal curing agent molecular structure itself, with raw material kind when curing agent in preparation
The selection of class and raw material dosage is undivided, and the present invention is exactly based on the stringent raw material type that picks and is used with control raw material
Amount is to reach the interior curing agent for preparing super absorbent polymer type of good performance.
Wherein, acrylic compounds belong to ionic comonomer, and salt tolerant alkali ability is weak, but water absorbing capacity is good, it may include third
The derivative of olefin(e) acid and/or acrylic acid, preferably monoolefine unsaturated acids, more preferably acrylic acid, methacrylic acid, ethyl third
One of which in olefin(e) acid or several mixing.Acrylamides belong to nonionic monomers, and salt tolerant alkali ability is strong, inhale
Outlet capacity is weaker, but rate of water absorption is faster than acrylic compounds, by total according to a certain percentage with acrylic compounds
It is poly-, the gel strength and strong basicity resisting energy of synthetic resin are improved, the water absorbent rate of SAP, acrylamides are reduced
Derivative including acrylamide and/or acrylamide；Preferably acrylamide, Methacrylamide, N- methylol acryloyls
One of which among amine or several mixing, it is seen that acrylamides are as major ingredient with acrylic compounds must
Palpus raw material to be added, and the additive amount of each substance is also to have specifically to require, it is necessary to the ability in suitable range
Ensure being smoothed out for polymerisation, finally obtains the preferably interior curing agent of performance；The general additive amount of acrylic compounds
Control is at 4-12 parts, and more excellent is 4.5-10 parts, and more excellent is 5 parts, it is also an option that be 6 parts, 8 parts, 11 parts etc., acrylic amide
Close object general additive amount control at 40-120 part, it is more excellent be 50-100 parts, more excellent is 75 parts, it is also an option that be 45 parts, 55
Part or 90 parts etc..Both raw materials also have in specific choice than more preferably type, the production that these types are not only prepared
Product effect is good, and raw material itself is cheap and easy to get, therefore as preferred raw materials.
In the present invention, it also added other than addition acrylic compounds, acrylamides in raw material
Crosslinking agent, reducing agent and initiator, crosslinking agent has forms cross-linked structure between the molecule of line style, and it is soluble to reduce line style
Polymer forms the effect of stable three-dimensional space net structure, and crosslinking agent is preferably N, N '-methylene-bisacrylamides,
Not only effect is excellent but also cheap and easily-available for this crosslinking agent, and reducing agent is preferably N, N, N ', N '-tetramethylethylenediamines, initiator can
It is selected as the mixing of one or more of potassium peroxydisulfate, ammonium persulfate and sodium peroxydisulfate, in polymerisation generating process
The effects that playing the primary group of free radicals for generating and causing monomer polymerization, chain initiation, chain growth and chain termination then occur, crosslinking agent,
Reducing agent and initiator these three substances one can not lack, and may cause polymerisation cannot if lacking any type
It is normal to carry out.The additive amount of crosslinking agent is generally 0.05-0.2 parts, and preferably 0.1-0.18 parts, optimal is 0.14 part, may be used also
To be selected as 0.06 part, 0.07 part and 0.08 part etc.；The additive amount of reducing agent is generally 0.02-0.10 parts, preferably 0.03-
0.06 part, optimal is 0.05 part, it is also an option that being 0.025 part, 0.035 part and 0.045 part etc.；The additive amount one of initiator
As be 0.05-0.2 part, preferably 0.1-0.18 parts, optimal is 0.14 part, it is also an option that be 0.07 part, 0.11 part and
0.13 part etc., in addition further include 100-300 parts of deionized water in raw material, and preferably 150-200 parts, more excellent is 170 parts, can be with
It is selected as 120 parts, 130 parts or 160 parts etc..
Need to illustrate is, raw material proportioning of the invention is that inventor passes through a large amount of creative experiments optimization
More excellent dosage only just can guarantee for preparing is suitable for strong alkali environment under the premise of adding these raw materials and the raw material proportioning
Concrete inner curing agent possess excellent properties, interior curing agent in the prior art generally match it is unreasonable, to the property of concrete
Can also have an impact, the present invention combines technical problems all in the prior art, strictly controls the additive amount of each raw material, and
And in order to improve the performance for the concrete inner curing agent for being suitable for strong alkali environment, a large amount of reality is had also been made to the screening of raw material type
Test, the dosage of each raw material it is relatively more with it is few have centainly investigate, finally putting into practice out optimal additive amount makes its more adduction
Reason, the formula that can refer to and specific dosage are provided subsequently to make the packing material, have certain reference value.
The present invention provides not only the formula of the concrete inner curing agent suitable for strong alkali environment, additionally provides the concrete
The preparation method of interior curing agent, includes the following steps：
By all raw materials according to deionized water, reducing agent, crosslinking agent, acrylic compounds, acrylamides,
The sequence of initiator is added successively be mixed evenly after, to get concrete after the step of heat preservation, standing, shearing, drying
Interior curing agent.
The preparation method of concrete inner curing agent provided by the invention suitable for strong alkali environment is simple, easy to operate, energy
It is enough effectively maintained the active ingredient of each raw material, noticeable place is the addition sequence it is noted that raw material, needs tight
Lattice charging sequence according to the invention is added, and first successively adds deionized water, reducing agent, crosslinking agent, because if third
If acrylamide compound first adds, the dissolving of acrylamides can reduce the temperature of solution, and powder is added after reducing
The solution rate of material, to influence reaction result, therefore the preferably revealed charging sequence of scheme according to the invention is added
Add.It is also preferably stirred evenly after adding each raw material, is conducive to the whole uniformity coefficient of raw material in this way, and make system
More preferably for the properties of product gone out.
Wherein, the temperature being mixed evenly is preferably controlled in 60-80 DEG C, preferably 65-75 DEG C, is also mixed equal
The even time, the rate being mixed evenly was preferably controlled in 100-200rad/min preferably in 20-30min.It is mixed
Rate, time and temperature are preferably controlled in the suitable range of comparison, can be broken because if the too fast mixing time of rate is long
The active ingredient of itself in bad raw material influences properties of product, therefore parameters are preferably controlled in suitable range.
Preferably, at 60-80 DEG C, soaking time is controlled in 3-5h, and reaction is directly occurring for the temperature control of heat preservation
Carry out the heat preservation operation of a period of time, the integrated degree that polymerisation can be promoted to carry out again afterwards.
Preferably, the temperature of standing is controlled at 20-25 DEG C；It is preferred that the time control stood is in 20-24h, the purpose of standing
It is on the one hand to that interior curing agent is made fully to react, is on the other hand for the ease of subsequent operation, general stand reaches room temperature temperature
Degree.
During the step of shearing, the bulk that granularity is less than 5mm is preferably cut into, is conducive to subsequently be applied,
It is and then dried after shearing step, dry temperature is preferably controlled between 100-110 DEG C, and the dry time preferably controls
In 18-24h, dry temperature should not be too high, otherwise can destroy active ingredient.
Finally, further include the steps that being ground into granularity as 45 μm of powderies below after drying steps.Granularity control is existed
The interior curing agent that water absorption and swelling can be significantly reduced within the scope of this releases the size in the left a blank hole in concrete after water completely, because
This this parameter is particularly important.
The concrete inner curing agent suitable for strong alkali environment that the embodiment of the present invention is prepared has good resistance to highly basic
Property, product of the invention it is alternative tradition in conserving material, when without watering, spraying watering, spray-coated film, covering
Realize the interior maintenance of high performance concrete, self-compacting concrete and mass concrete, and the technological process entirely prepared
It more rationally and realizes standardization, is easy to manipulate, obtained properties of product are preferable.
Compared with prior art, beneficial effects of the present invention are：
(1) embodiment of the present invention makes amide groups and carboxylic acid group in its molecular structure by being designed to SAP molecular structures
Ratio be 9-20:1, the interior curing agent after water absorption and swelling of the present invention is placed in saturated calcium hydroxide aqueous solution and impregnates 48h, the phase
Between not there is a phenomenon where sharp decline and color change, release within 48 hours water rate and (release water rate=(the SAP mass-of water absorption and swelling is full
With impregnated 48 hours in calcium hydroxide aqueous solution after quality) ÷ water absorption and swellings SAP mass * 100%) be less than 44%, and can be with
Water is absorbed water and released repeatedly, shows that interior curing agent has good strong basicity resisting；
(2) interior curing agent water absorbent rate of the invention controls between 10-45, and granularity is controlled in D97Less than 45 μm hereinafter,
The SAP that water absorption and swelling can be significantly reduced releases the size in the left a blank hole in concrete after water completely, is supported in completely alternative tradition
Protective material realizes high performance concrete, self-compacting concrete when without watering, spraying watering, spray-coated film, covering
With the interior maintenance of mass concrete.
(3) preparation method of the concrete inner curing agent provided by the invention suitable for strong alkali environment is simple, easy to operate,
It can be good at the active ingredient for retaining each raw material, the interior curing agent is applied widely, right in addition to being suitable for normal concrete
Also there is maintenance action in well in the concrete of strong alkali environment, and do not interfere with the performance of concrete, this product is suitable
For wide popularization and application.
Specific implementation mode
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is
The conventional products that can be obtained by commercially available purchase.
Embodiment 1
The preparation method of concrete inner curing agent is as follows：
1) deionized water 100g, reducing agent N, N, N are weighed successively ', N '-tetramethylethylenediamine 0.02g are added in beaker,
It is sufficiently mixed uniformly, then weighs 0.05g crosslinking agents N, N '-methylene-bisacrylamide, be also added in beaker and be sufficiently stirred
It is even；
2) 4g acrylic acid is quickly weighed in draught cupboard and 40g acrylamides are added in beaker, and it is equal to be sufficiently mixed stirring
It is even, it finally weighs the addition of 0.05g initiators and stirs；
3) beaker is placed in 60-80 DEG C of water bath with thermostatic control, stirring to mixture occurs stopping stirring when " pole-climbing phenomenon ", waits for
After reactant dilation, with preservative film capped beaker, 3-5h is kept the temperature, and be placed at room temperature for 20-24h, it is small to be processed into grain size
In the bulk of 5 ㎜, dry 18-24h, granularity D is crushed to airslide disintegrating mill in 100-105 DEG C of thermostatic drying chamber97=4-45 μ
The powder of m is to get the concrete inner curing agent suitable for strong alkali environment.
Embodiment 2
The preparation method of concrete inner curing agent is as follows：
1) deionized water 300g, reducing agent N, N, N are weighed successively ', N '-tetramethylethylenediamine 0.1g are added in beaker, fill
Divide and be uniformly mixed, then weigh 0.2g crosslinking agents N, N '-methylene-bisacrylamide, be also added in beaker and stir；
2) 8g methacrylic acids are quickly weighed in draught cupboard and 120g Methacrylamides are added in beaker, it is fully mixed
Conjunction stirs evenly, and finally weighs the addition of 0.2g initiators and stirs；
3) beaker is placed in 65-75 DEG C of water bath with thermostatic control, stirring to mixture occurs stopping stirring when " pole-climbing phenomenon ", waits for
After reactant dilation, with preservative film capped beaker, 3-5h is kept the temperature, and 20-24h is placed under the conditions of 20-25 DEG C, handled
It is less than the bulk of 5 ㎜ at grain size, dry 18-24h, granularity is crushed to airslide disintegrating mill in 100-110 DEG C of thermostatic drying chamber
In 45 μm of powder below to get the concrete inner curing agent suitable for strong alkali environment.
Embodiment 3
The preparation method of concrete inner curing agent is as follows：
1) deionized water 150g, reducing agent N, N, N are weighed successively ', N '-tetramethylethylenediamine 0.03g are added in beaker,
It is sufficiently mixed uniformly, then weighs 0.1g crosslinking agents N, N '-methylene-bisacrylamide, be also added in beaker and be sufficiently stirred
It is even；
2) 10g methacrylic acids are quickly weighed in draught cupboard and 100gN- hydroxymethyl acrylamide is added in beaker,
It is sufficiently mixed and stirs evenly, finally weigh the addition of 0.1g initiator ammonium persulfates and stir；
3) beaker is placed in 65-75 DEG C of water bath with thermostatic control, stirring to mixture occurs stopping stirring when " pole-climbing phenomenon ", waits for
After reactant dilation, with preservative film capped beaker, 3-5h is kept the temperature, and be placed at room temperature for 20-24h, it is small to be processed into grain size
In the bulk of 5 ㎜, the dry 18-24h in 100-110 DEG C of thermostatic drying chamber, with airslide disintegrating mill be crushed to granularity 35 μm with
Under powder to get the concrete inner curing agent suitable for strong alkali environment.
Embodiment 4
The preparation method of concrete inner curing agent is as follows：
1) deionized water 200g, reducing agent N, N, N are weighed successively ', N '-tetramethylethylenediamine 0.06g are added in beaker,
It is sufficiently mixed uniformly, then weighs 0.18g crosslinking agents N, N '-methylene-bisacrylamide, be also added in beaker and be sufficiently stirred
It is even；
2) 4.5g ethylacrylic acids are quickly weighed in draught cupboard and 50g Methacrylamides are added in beaker, fully
It is mixed evenly, finally weighs the addition of 0.18g initiator potassium persulfates and stir；
3) beaker is placed in 65-75 DEG C of water bath with thermostatic control, stirring to mixture occurs stopping stirring when " pole-climbing phenomenon ", waits for
After reactant dilation, with preservative film capped beaker, 3-5h is kept the temperature, and 20-24h is placed under the conditions of 20-25 DEG C, handled
It is less than the bulk of 5 ㎜ at grain size, dry 18-24h, granularity is crushed to airslide disintegrating mill in 100-110 DEG C of thermostatic drying chamber
In 40 μm of powder below to get the concrete inner curing agent suitable for strong alkali environment.
Embodiment 5
The preparation method of concrete inner curing agent is as follows：
1) deionized water 170g, reducing agent N, N, N are weighed successively ', N '-tetramethylethylenediamine 0.05g are added in beaker,
It is sufficiently mixed uniformly, then weighs 0.14g crosslinking agents N, N '-methylene-bisacrylamide, be also added in beaker and be sufficiently stirred
It is even；
2) mixture and 75g methacryls of 5g methacrylic acids and ethylacrylic acid are quickly weighed in draught cupboard
The mixture of amine and acrylamide be added beaker in, be sufficiently mixed and stir evenly, finally weigh 0.14g initiator potassium persulfates,
The mixture addition of ammonium persulfate stirs；
3) beaker is placed in 65-75 DEG C of water bath with thermostatic control, stirring to mixture occurs stopping stirring when " pole-climbing phenomenon ", waits for
After reactant dilation, with preservative film capped beaker, 3-5h is kept the temperature, and 20-24h is placed under the conditions of 20-25 DEG C, handled
It is less than the bulk of 5 ㎜ at grain size, dry 18-24h, granularity is crushed to airslide disintegrating mill in 100-110 DEG C of thermostatic drying chamber
In 45 μm of powder below to get the concrete inner curing agent suitable for strong alkali environment.
Experimental example 1
Concrete inner curing agent that 1-5 of the embodiment of the present invention is prepared with application No. is in 201110195132.0 patents
Embodiment 1 prepare interior curing agent (comparative example 1), application No. is in 201410057770.X patents embodiment 1 preparation
The interior curing agent (comparative example 2) gone out the water experiment that absorb water-release measures relevant experimental data, is shown in Table 1；To concrete inner curing agent
It carries out Mechanics Performance Testing and obtains relevant experimental data, be shown in Table 2, specific experimental working technique is as follows：Test use/reference cement gel
The method (ISO methods) (GB/T17671-1999) of sand test carries out resistance to compression and bending test to the cement mortar test specimen mixed with SAP
Test, by the comparison with blank test, to judge influences of the SAP to the concrete strength performance of low water binder ratio.
Operating method is as follows：450g reference cements and suitable SAP are weighed successively, are added (next in dry agitated kettle
Group experiment only need to be with dry cloth by agitated kettle wiped clean),
Blender manual mode is opened, stirring at low speed 20s, high-speed stirred 10s are repeated primary (the total 60s of stirring)；It weighs
Water-reducing agent+tap water+interior curing water, it pours into agitated kettle, is tested, subsequent step is identical as grinding aid dropwise addition experiment.
The curing agent performance parameter table of comparisons in table 1
2 concrete performance parameter lookup table of table
Remarks：Water-reducing agent is the Cologne SPF- 300, and water-reducing rate 23% configures solid content 10%, and additive amount is 30 grams, water
Glue is than 0.31.
As can be seen from Table 1 and Table 2, the concrete inner curing agent suitable for strong alkali environment of the embodiment of the present invention is very
The maintenance of concrete suitable for strong basicity, in the case where reducing water absorption rate and grain size, Water-saving effect (releases water rate after swelling
It is low) it is good, the water-cement ratio of concrete will not be significantly improved during concrete mixing, SAP leaves empty small, coagulation in concrete
The native intensity of itself is guaranteed, and belongs in the field and is supported in a kind of very promising concrete suitable for strong alkali environment
Agent is protected, the maintenance of various concrete is widely used in, it is more preferable for the maintenance effect of medium-sized concrete, and will not be to mixed
Solidifying local products give birth to any side effect, influence its performance.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (9)
1. a kind of concrete inner curing agent suitable for strong alkali environment, which is characterized in that be made by following raw material：With mass fraction
Meter, 4-12 parts of acrylic compounds, 40-120 parts of acrylamides, 0.05-0.2 parts of crosslinking agent, reducing agent 0.02-
0.10 part, 0.05-0.2 parts of initiator, 100-300 parts of deionized water；
The acrylic compounds are the derivative of acrylic acid and/or acrylic acid, and the acrylamides are propylene
The derivative of amide and/or acrylamide；
The preparation method of the concrete inner curing agent includes：
By all raw materials according to deionized water, reducing agent, crosslinking agent, acrylic compounds, acrylamides, initiation
The sequence of agent add successively 60-80 DEG C be mixed evenly after, by 60-80 DEG C heat preservation 3-5h, 20-25 DEG C stand 20-24h,
After the step of cutting into bulk of the granularity less than 5mm, 100-110 DEG C of dry 18-24h, it is 45 μm or less to be ground into granularity
Powdery to get concrete inner curing agent.
2. the concrete inner curing agent according to claim 1 suitable for strong alkali environment, which is characterized in that with mass fraction
Meter, 4.5-10 parts of acrylic compounds, 50-100 parts of acrylamides, 0.1-0.18 parts of crosslinking agent, reducing agent
0.03-0.06 parts, 0.1-0.18 parts of initiator, 150-200 parts of deionized water.
3. the concrete inner curing agent according to claim 2 suitable for strong alkali environment, which is characterized in that with mass fraction
Meter, 5 parts of acrylic compounds, 75 parts of acrylamides, 0.14 part of crosslinking agent, 0.05 part of reducing agent, initiator
0.14 part, 170 parts of deionized water.
4. being suitable for the concrete inner curing agent of strong alkali environment according to claim 1-3 any one of them, which is characterized in that institute
State the mixing that initiator includes one or more of potassium peroxydisulfate, ammonium persulfate and sodium peroxydisulfate.
5. the concrete inner curing agent according to claim 4 suitable for strong alkali environment, which is characterized in that the reducing agent
For N, N, N ', N '-tetramethylethylenediamines.
6. the concrete inner curing agent according to claim 4 suitable for strong alkali environment, which is characterized in that the crosslinking agent
For N, N '-methylene-bisacrylamides.
7. the concrete inner curing agent according to claim 1 suitable for strong alkali environment, which is characterized in that the acrylic acid
Class compound is monoolefine unsaturated acids.
8. the concrete inner curing agent according to claim 1 suitable for strong alkali environment, which is characterized in that the acrylic acid
Class compound is acrylic acid, methacrylic acid, the one of which in ethylacrylic acid or several mixing.
9. the concrete inner curing agent according to claim 1 suitable for strong alkali environment, which is characterized in that the acryloyl
Aminated compounds is acrylamide, Methacrylamide, the one of which among N hydroxymethyl acrylamide or several mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610056919.1A CN105542072B (en) | 2016-01-28 | 2016-01-28 | A kind of concrete inner curing agent and preparation method thereof suitable for strong alkali environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610056919.1A CN105542072B (en) | 2016-01-28 | 2016-01-28 | A kind of concrete inner curing agent and preparation method thereof suitable for strong alkali environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105542072A CN105542072A (en) | 2016-05-04 |
| CN105542072B true CN105542072B (en) | 2018-08-17 |
Family
ID=55821660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610056919.1A Active CN105542072B (en) | 2016-01-28 | 2016-01-28 | A kind of concrete inner curing agent and preparation method thereof suitable for strong alkali environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105542072B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107216430B (en) * | 2017-07-21 | 2019-04-05 | 贵州铁建恒发新材料科技股份有限公司 | A kind of preparation method of temperature sensitive sequestering gel concrete inner curing agent |
| CN108911786B (en) * | 2018-08-21 | 2021-07-13 | 西安龙宾立强环保科技有限公司 | Concrete internal curing agent and preparation method thereof |
| CN109135377A (en) * | 2018-09-21 | 2019-01-04 | 佛山齐安建筑科技有限公司 | A kind of preparation method of curing compound |
| CN110746535A (en) * | 2019-11-05 | 2020-02-04 | 长安大学 | Concrete internal curing agent, preparation method and application thereof |
| CN112300322A (en) * | 2020-10-29 | 2021-02-02 | 甘肃恒石公路检测科技有限公司 | Super absorbent resin suitable for concrete alkaline environment and preparation method thereof |
| CN113248657B (en) * | 2021-02-24 | 2022-07-12 | 青岛理工大学 | Ternary polymerization saline-alkali-resistant slow-release water-absorbent resin with semi-interpenetrating network structure and application thereof |
| CN112961284A (en) * | 2021-02-24 | 2021-06-15 | 青岛理工大学 | Saline-alkali-resistant slow-release water-absorbent resin with semi-interpenetrating network structure and application thereof |
| CN113105578B (en) * | 2021-02-24 | 2022-08-23 | 青岛理工大学 | Saline-alkali resistant slow-release water-absorbent resin and application thereof |
| CN114671639B (en) * | 2022-04-19 | 2023-03-21 | 安徽省路港工程有限责任公司 | Blending agent for resisting concrete shrinkage cracks of bridge guardrail and preparation method thereof |
| CN114957559B (en) * | 2022-05-24 | 2023-09-15 | 佳化化学科技发展（上海）有限公司 | Amide water reducer and preparation method thereof |
| CN115925307B (en) * | 2022-12-23 | 2024-01-23 | 杭州构建新型材料有限公司 | Concrete curing agent and preparation method thereof |
| CN118479771B (en) * | 2024-07-16 | 2024-10-08 | 浙江农林大学 | Preparation method of internal curing composite gel and application of internal curing composite gel in high-performance concrete |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819614A (en) * | 2014-02-20 | 2014-05-28 | 桂林理工大学 | Preparation method for alkali capacitive and high water-holding concrete internal curing material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003183065A (en) * | 2001-10-09 | 2003-07-03 | Mitsubishi Rayon Co Ltd | Concrete for greening |
| CN104513341A (en) * | 2013-09-27 | 2015-04-15 | 中国石油天然气股份有限公司 | Slow-swelling water-absorbing and salt-resisting gel particles and preparation and application thereof |
| CN103641952B (en) * | 2013-12-17 | 2015-12-30 | 北京希涛技术开发有限公司 | A kind of production method of polyacrylamide modified water absorbent resin inside concrete maintaining agent |
-
2016
- 2016-01-28 CN CN201610056919.1A patent/CN105542072B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819614A (en) * | 2014-02-20 | 2014-05-28 | 桂林理工大学 | Preparation method for alkali capacitive and high water-holding concrete internal curing material |
Non-Patent Citations (2)
| Title |
|---|
| SAP在混凝土内养护中的性能及应用研究;刘姝麟等;《西安交通科技》;20150930(第9期);第5-7,54页 * |
| 高吸水树脂对水泥性能的影响;舒冬梅;《第六届中国功能材料及其应用学术会议论文集（9）》;20071130;第38卷;第3387-3390页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105542072A (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105542072B (en) | A kind of concrete inner curing agent and preparation method thereof suitable for strong alkali environment | |
| EP2167443B1 (en) | Polymer-tempered dry construction material mixtures | |
| EP2646389B1 (en) | Powdered accelerator | |
| EP2499104B1 (en) | Dry mortar mixture | |
| CN110256025A (en) | Its regeneration concrete of a kind of preparation process of Aggregate of recycled concrete and application | |
| CN108101403B (en) | A kind of preparation method of environment-friendly type alkali-free liquid accelerator | |
| WO2014151388A1 (en) | Hydraulic composition with prolonged open time | |
| DE10049127C2 (en) | Redispersible dispersion powder composition, process for its preparation and its use | |
| JP2007534608A (en) | Cement system using moisture retention agent made from raw cotton linter | |
| CN109942739A (en) | A kind of waterglass-acrylates plural gel water shutoff agent and preparation method thereof | |
| CN109516714A (en) | A kind of ceramsite carrier concrete inner curing agent and preparation method thereof | |
| CN106366257A (en) | Low-sensitivity anti-mud crossed branched chain type polycarboxylate superplasticizer and preparation method thereof | |
| CN102504827B (en) | Soil solidifying agent with compound function and use method thereof | |
| CN103113508B (en) | Super absorbent resin with lower liquid absorbing rate, and preparation method and application thereof | |
| CN107010903A (en) | Exempt from basal plane processing and the sprayable anti-hollowing motar of cracking resistance and its construction method | |
| CN109665745A (en) | A kind of multifunctionality polycarboxylate water-reducer and preparation method thereof | |
| CN108751784A (en) | A kind of special reinforcing agent of premixing pervious concrete and preparation method thereof | |
| CN108821711A (en) | A kind of slope protection plant-growing type eco-concrete and preparation method thereof | |
| JPH01203251A (en) | Cement admixture and composition | |
| EP3954667A1 (en) | Additive for cement, cement admixture, cement composition, molded article, and strength improvement method for molded article | |
| CN105646767B (en) | A kind of concrete super absorbent resin epoxy-type Self-curing material and preparation method | |
| CN105924565B (en) | Modified super absorbent polymer and preparation method thereof and the application in cement-based material | |
| CN106587708B (en) | A kind of pervious concrete polycarboxylate water-reducer and preparation method thereof | |
| CN107663036A (en) | A kind of preparation method of anti-freezing type economization agent for concrete | |
| CN106632742A (en) | Composite activator system and method for preparing concrete water-reducing admixture from same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |