CN114133159A - Engineering early strength water reducing agent and processing method and device thereof - Google Patents
Engineering early strength water reducing agent and processing method and device thereof Download PDFInfo
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- CN114133159A CN114133159A CN202111450005.0A CN202111450005A CN114133159A CN 114133159 A CN114133159 A CN 114133159A CN 202111450005 A CN202111450005 A CN 202111450005A CN 114133159 A CN114133159 A CN 114133159A
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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses an engineering early strength water reducing agent and a processing method and a device thereof, and the engineering early strength water reducing agent comprises the following raw materials in parts by weight: a first component: 5-20 parts of methyl allyl polyoxyethylene ether and 5-6 parts of sodium methacrylate sulfonate; a second component: 10-20 parts of azodiisobutyronitrile, 0.5-1 part of initiator, 1, 2-benzisothiazol-3-one, 1-2 parts of nano gallium oxide, 1-2 parts of solvent and 50-70 parts of water, sequentially adding the second component into a stirring device, heating to 40 ℃ through water bath, preserving heat and continuously stirring for 1-1.5 hours to obtain a first mixture; the invention accelerates hydration to shorten the setting time, is beneficial to reducing water consumption when the water reducing agent is doped into concrete, reduces a water film layer, changes an aggregate-cement interface structure, and effectively improves the early strength of the concrete by matching with a stirring device with better mixing effect.
Description
Technical Field
The invention relates to the technical field of concrete processing, in particular to an engineering early strength water reducing agent and a processing method and device thereof.
Background
When concrete with higher strength grade is prepared, a high-performance water reducing agent with high water reducing rate is usually selected. The polycarboxylic acid water reducer has the excellent performances of high water reducing rate, obvious reinforcing effect, low slump loss of concrete mixtures and the like, and becomes a hotspot for research and development of water reducers at home and abroad, although the existing water reducer has a certain retarding effect, the setting time of concrete is prolonged, the early strength is not favorably improved, and in the processing process, because the existing stirring device has poor stirring effect, the final produced water reducer performance is not favorably improved, so the polycarboxylic acid water reducer, the processing method and the processing device thereof are provided aiming at the problems.
Disclosure of Invention
The invention aims to provide an engineering early strength water reducing agent and a processing method and device thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an engineering early strength water reducing agent comprises the following raw materials in parts by weight: a first component: 5-20 parts of methyl allyl polyoxyethylene ether and 5-6 parts of sodium methacrylate sulfonate;
a second component: 10-20 parts of azodiisobutyronitrile, 0.5-1 part of initiator, 1, 2-benzisothiazol-3-one, 1-2 parts of nano gallium oxide, 1-2 parts of solvent and 50-70 parts of water.
A processing method of an engineering early strength water reducing agent comprises the following steps:
step 1: sequentially adding the second component into a stirring device, heating to 40 ℃ through a water bath, preserving heat and continuously stirring for 1-1.5h to obtain a first mixture;
step 2: and adding the first component into the first mixture, heating to 80 ℃, keeping the temperature for reaction for 8 hours, stirring for 200min, and cooling to room temperature to obtain the water reducer.
The stirring device comprises a stirring box for charging, wherein a plurality of supporting legs are arranged at the bottom of the stirring box, a supporting seat for supporting is arranged at the lower end of each supporting leg, a discharge hole for discharging materials and a discharge valve arranged on the discharge hole are arranged at the right side of the stirring box, a fixed column is fixedly arranged at the middle position of the bottom of the stirring box, a driving motor is arranged above the fixed column, the outer side of the driving motor is fixedly connected with the stirring box through a supporting frame, a rotating disc rotationally connected with the upper end of the fixed column is arranged at the output end of the driving motor, a plurality of stirring rods are distributed at the lower end of the rotating disc in an array manner, the cross section of each stirring rod is oval, a horizontal side plate is slidably penetrated on each stirring rod, a guide block is arranged at one end of each horizontal side plate, and is slidably arranged in a rotary groove at the outer side of the fixed column, the stirring montant of a vertical setting is equipped with to horizontal curb plate outer end, stirring montant lower extreme symmetry is equipped with the stirring side lever that a plurality of is used for the stirring.
As a further scheme of the invention: the lower end of the poke rod is fixedly connected with the outer side of the fixed column through a reinforcing plate.
As a further scheme of the invention: the stirring montant lower extreme is equipped with the scraping bottom plate that a level set up, it is equipped with the material curb plate of scraping that is used for scraping the material to the agitator tank inner wall to scrape the material bottom plate outer end.
As a further scheme of the invention: the stirring box is characterized in that an auxiliary convection mechanism is further arranged inside the stirring box and comprises a rotating seat rotatably arranged at the lower end of the fixed column, a plurality of diversion channels are distributed in the rotating seat in an array mode, an outlet port used for discharging materials is arranged at the outer end of each diversion channel, a feed inlet is arranged at the inner end of each diversion channel, a diversion blade used for guiding materials to enter is arranged at the position of the feed inlet, and the outlet port is connected with a magnetic driving piece used for driving the outlet port to rotate.
As a further scheme of the invention: the magnetic driving part comprises a stirring inner shaft coaxially arranged in the fixed column, the upper end of the stirring inner shaft is connected with the output end of the driving motor, the lower end of the stirring inner shaft extends into a transmission box at the bottom of the stirring box, a first magnetic driving rod connected with the lower end of the stirring inner shaft is arranged in the transmission box, and a plurality of second magnetic rods corresponding to the first magnetic driving rod are distributed in the rotating seat in an array mode.
As a further scheme of the invention: the number of the first magnetic driving rods corresponds to that of the second magnetic driving rods.
As a still further scheme of the invention: a gap exists between the discharge port and the inner wall of the stirring box.
Compared with the prior art, the invention has the beneficial effects that: the invention accelerates hydration to shorten the setting time, is beneficial to reducing water consumption when the water reducing agent is doped into concrete, reduces a water film layer, changes an aggregate-cement interface structure, and effectively improves the early strength of the concrete by matching with a stirring device with better mixing effect.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a horizontal side and a fixing column in the present invention.
Fig. 3 is a schematic structural view of the rotary base of the present invention.
Wherein: the device comprises a stirring box 11, a fixed column 12, a driving motor 13, a rotating disc 14, a poking rod 15, a supporting frame 16, a vertical stirring rod 17, a stirring side rod 18, a scraping side plate 19, a scraping bottom plate 20, a discharge hole 21, a discharge valve 22, a rotating seat 23, a first magnetic driving rod 24, a transmission box 25, a supporting seat 26, a supporting leg 27, a stirring inner shaft 28, a second magnetic rod 29, a discharge port 30, a flow guide channel 31, a flow guide blade 32 and a horizontal side plate 33.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In the embodiment of the invention, the engineering early strength water reducing agent comprises the following raw materials in parts by weight: a first component: 5-20 parts of methyl allyl polyoxyethylene ether and 5-6 parts of sodium methacrylate sulfonate;
a second component: 10-20 parts of azodiisobutyronitrile, 0.5-1 part of initiator, 1, 2-benzisothiazol-3-one, 1-2 parts of nano gallium oxide, 1-2 parts of solvent and 50-70 parts of water;
the processing method of the early strength water reducing agent comprises the following steps:
step 1: sequentially adding the second component into a stirring device, heating to 40 ℃ through a water bath, preserving heat and continuously stirring for 1-1.5h to obtain a first mixture;
step 2: and adding the first component into the first mixture, heating to 80 ℃, keeping the temperature for reaction for 8 hours, stirring for 200min, and cooling to room temperature to obtain the water reducer.
Referring to fig. 1-3, the stirring apparatus includes a stirring tank 11 for loading materials, a plurality of supporting legs 27 are disposed at the bottom of the stirring tank 11, a supporting seat 26 for supporting is disposed at the lower end of each supporting leg 27, a discharge port 21 for discharging materials and a discharge valve 22 disposed on the discharge port 21 are disposed at the right side of the stirring tank 11, a fixed column 12 is fixedly disposed at the middle position of the bottom of the stirring tank 11, a driving motor 13 is disposed above the fixed column 12, the outer side of the driving motor 13 is fixedly connected to the stirring tank 11 through a supporting frame 16, a rotating disc 14 rotatably connected to the upper end of the fixed column 12 is disposed at the output end of the driving motor 13, a plurality of dial bars 15 are distributed at the lower end of the rotating disc 14 in an array manner, the cross section of the dial bar 15 is elliptical, a horizontal side plate 33 is slidably disposed on each dial bar 15, a guide block is disposed at one end of the horizontal side plate 33, the guide block is arranged in a rotary groove in the outer side of the fixed column 12 in a sliding manner, a vertical stirring rod 17 is arranged at the outer end of the horizontal side plate 33, a plurality of stirring side rods 18 for stirring are symmetrically arranged at the lower end of the vertical stirring rod 17, when stirring is carried out, the driving motor 13 drives the rotating disc 14 to rotate, the rotating disc 14 drives the poking rod 15 to rotate, the poking rod 15 drives the vertical stirring rod 17 to rotate around the fixed column 12 through the horizontal side plate 33, so that materials in the stirring box 11 are stirred, when the horizontal side plate 33 rotates around the fixed column 12, the horizontal side plate 33 drives the vertical stirring rod 17 to move up and down in a reciprocating manner under the guide of the rotary groove, so that longitudinal stirring is realized, compared with a traditional horizontal stirring manner, the vertical and horizontal combined stirring effect is better, and the quality of a finished water reducing agent is improved;
the lower end of the vertical stirring rod 17 is provided with a horizontally arranged scraping bottom plate 20, the outer end of the scraping bottom plate 20 is provided with a scraping side plate 19 for scraping the inner wall of the stirring box 11, and thus when the scraping side plate 19 rotates circumferentially, the scraping side plate 19 can rotate circumferentially and move longitudinally, so that the inner wall of the stirring box 11 can be better scraped, and the stirring dead angle is further eliminated;
an auxiliary convection mechanism is also arranged in the stirring box 11, the auxiliary convection mechanism comprises a rotating seat 23 which is rotatably arranged at the lower end of the fixed column 12, a plurality of flow guide channels 31 are distributed in the rotary seat 23 in an array manner, the outer end of each flow guide channel 31 is provided with an exhaust port 30 for discharging, the inner end of the flow guide channel 31 is provided with a feed inlet, the feed inlet is provided with a flow guide blade 32 for guiding the material to enter, the discharge port 30 is connected with a magnetic driving piece for driving the magnetic driving piece to rotate, under the driving of the magnetic driving member, the rotating base 23 rotates at the bottom of the stirring tank 11, the rotating base 23 will drive the guide vane 32 to rotate, under the guidance of the guide vanes 32, the material enters the guide channel 31 along the feed inlet, then gushes out from the discharge port 30 at the other end of the guide channel 31, thereby promoting the convection of the materials at the bottom and further improving the mixing effect by matching with the stirring side rods 18;
the magnetic driving part comprises a stirring inner shaft 28 coaxially arranged inside the fixed column 12, the upper end of the stirring inner shaft 28 is connected with the output end of the driving motor 13, the lower end of the stirring inner shaft 28 extends into a transmission box 25 at the bottom of the stirring box 11, a first magnetic driving rod 24 connected with the lower end of the stirring inner shaft 28 is arranged inside the transmission box 25, a plurality of second magnetic rods 29 corresponding to the first magnetic driving rods 24 are distributed inside the rotary base 23 in an array mode, the first magnetic driving rods 24 rotate rapidly under the driving of the driving motor 13, and the second magnetic rods 29 can drive the rotary base 23 to rotate under the action of magnetic force, so that rotary power is provided for the rotation of the rotary base 23.
The working principle of the invention is as follows: during actual stirring, materials are added into the stirring box 11, then the driving motor 13 drives the rotating disc 14 to rotate, the rotating disc 14 drives the poking rod 15 to rotate, the poking rod 15 drives the stirring vertical rod 17 to rotate around the fixed column 12 through the horizontal side plate 33, so that the materials inside the stirring box 11 are stirred, when the horizontal side plate 33 rotates around the fixed column 12, the horizontal side plate 33 drives the stirring vertical rod 17 to move up and down in a reciprocating manner under the guidance of the rotary groove, so as to realize longitudinal stirring, the first magnetic driving rod 24 rapidly rotates under the drive of the driving motor 13, the second magnetic rod 29 drives the rotating base 23 to rotate under the action of magnetic force, so as to provide rotary power for the rotating base 23 to rotate, the rotating base 23 rotates at the bottom of the stirring box 11, the rotating base 23 drives the guide vane 32 to rotate, and under the guidance of the guide vane 32, the materials enter the guide channel 31 along the feeding hole, then gushes out from the outlet port 30 at the other end of the flow guide channel 31, thereby promoting the convection of the materials at the bottom, and further improving the mixing effect by matching with the stirring side rod 18.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof.
Claims (9)
1. The engineering early strength water reducing agent is characterized by comprising the following raw materials in parts by weight: a first component: 5-20 parts of methyl allyl polyoxyethylene ether and 5-6 parts of sodium methacrylate sulfonate;
a second component: 10-20 parts of azodiisobutyronitrile, 0.5-1 part of initiator, 1, 2-benzisothiazol-3-one, 1-2 parts of nano gallium oxide, 1-2 parts of solvent and 50-70 parts of water.
2. The processing method of the engineering early strength water reducing agent according to claim 1, characterized by comprising the following steps:
step 1: sequentially adding the second component into a stirring device, heating to 40 ℃ through a water bath, preserving heat and continuously stirring for 1-1.5h to obtain a first mixture;
step 2: and adding the first component into the first mixture, heating to 80 ℃, keeping the temperature for reaction for 8 hours, stirring for 200min, and cooling to room temperature to obtain the water reducer.
3. The stirring device in the processing method of the engineering early strength water reducing agent is characterized in that the stirring device comprises a stirring tank (11) for charging, a plurality of supporting legs (27) are arranged at the bottom of the stirring tank (11), a supporting seat (26) for supporting is arranged at the lower end of each supporting leg (27), a discharge port (21) for discharging and a discharge valve (22) arranged on the discharge port (21) are arranged at the right side of the stirring tank (11), a fixed column (12) is fixedly arranged at the middle position of the bottom of the stirring tank (11), a driving motor (13) is arranged above the fixed column (12), the outer side of the driving motor (13) is fixedly connected with the stirring tank (11) through a supporting frame (16), a rotating disc (14) rotatably connected with the upper end of the fixed column (12) is arranged at the output end of the driving motor (13), the utility model discloses a stirring device, including rolling disc (14), transfer lever (15), horizontal curb plate (33), guide block, stirring side lever (17), stirring montant (17) lower extreme symmetry is equipped with a plurality of stirring side lever (18) that are used for the stirring, the cross-section of transfer lever (15) is oval, and it wears to be equipped with a horizontal curb plate (33) to slide on every transfer lever (15), horizontal curb plate (33) one end is equipped with the guide block, the guide block slides and sets up in the rotary tank in fixed column (12) outside, horizontal curb plate (33) outer end is equipped with stirring montant (17) of a vertical setting, stirring montant (17) lower extreme symmetry is equipped with a plurality of and is used for the stirring side lever (18).
4. The stirring device according to claim 3, characterized in that the lower end of the poke rod (15) is fixedly connected with the outer side of the fixed column (12) through a reinforcing plate.
5. The stirring device as claimed in claim 3, characterized in that the lower end of the vertical stirring rod (17) is provided with a horizontally arranged scraping bottom plate (20), and the outer end of the scraping bottom plate (20) is provided with a scraping side plate (19) for scraping the inner wall of the stirring tank (11).
6. The stirring device according to claim 3, characterized in that an auxiliary convection mechanism is further arranged inside the stirring tank (11), the auxiliary convection mechanism comprises a rotating base (23) rotatably arranged at the lower end of the fixed column (12), a plurality of flow guide channels (31) are distributed in an array manner inside the rotating base (23), an outlet port (30) for discharging is arranged at the outer end of each flow guide channel (31), a feed inlet is arranged at the inner end of each flow guide channel (31), a flow guide blade (32) for guiding the material to enter is arranged at the feed inlet, and the outlet port (30) is connected with a magnetic driving piece for driving the outlet port to rotate.
7. The stirring device according to claim 6, characterized in that the magnetic driving member comprises an inner stirring shaft (28) coaxially arranged inside the fixed column (12), the upper end of the inner stirring shaft (28) is connected with the output end of the driving motor (13), the lower end of the inner stirring shaft (28) extends into a transmission box (25) at the bottom of the stirring box (11), a first magnetic driving rod (24) connected with the lower end of the inner stirring shaft (28) is arranged inside the transmission box (25), and a plurality of second magnetic driving rods (29) corresponding to the first magnetic driving rod (24) are distributed in an array inside the rotating base (23).
8. Stirring device according to claim 6, wherein the number of said first magnetic driving rods (24) corresponds to the number of said second magnetic rods (29).
9. Stirring device according to claim 6, characterised in that a gap is present between the discharge port (30) and the inner wall of the stirring tank (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111450005.0A CN114133159B (en) | 2021-11-30 | 2021-11-30 | Engineering early strength water reducing agent and processing method and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111450005.0A CN114133159B (en) | 2021-11-30 | 2021-11-30 | Engineering early strength water reducing agent and processing method and device thereof |
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| CN114133159A true CN114133159A (en) | 2022-03-04 |
| CN114133159B CN114133159B (en) | 2022-09-02 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130172505A1 (en) * | 2010-07-27 | 2013-07-04 | Jian Fang | Synthesis method of polycarboxylic acid water-reducing agent |
| CN106543382A (en) * | 2016-12-07 | 2017-03-29 | 湖北工业大学 | A kind of solid lamellar polycarboxylate water-reducer and its polymerization process for preparing |
| CN111298751A (en) * | 2020-04-08 | 2020-06-19 | 哈尔滨强石新材料技术开发股份有限公司 | Polycarboxylate water reducing agent system of processing |
| CN112792995A (en) * | 2021-02-05 | 2021-05-14 | 王硕 | Concrete compounding device for building engineering |
| CN113105141A (en) * | 2021-03-26 | 2021-07-13 | 唐山冀东水泥外加剂有限责任公司 | Early-strength polycarboxylate superplasticizer and preparation method thereof |
| CN113634183A (en) * | 2021-09-09 | 2021-11-12 | 四川宇砼建材有限公司 | Preparation device and method of slow-release water reducing agent capable of being dried |
| CN214819654U (en) * | 2021-04-27 | 2021-11-23 | 河南建筑职业技术学院 | High-efficient concrete mixing device is used in engineering |
-
2021
- 2021-11-30 CN CN202111450005.0A patent/CN114133159B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130172505A1 (en) * | 2010-07-27 | 2013-07-04 | Jian Fang | Synthesis method of polycarboxylic acid water-reducing agent |
| CN106543382A (en) * | 2016-12-07 | 2017-03-29 | 湖北工业大学 | A kind of solid lamellar polycarboxylate water-reducer and its polymerization process for preparing |
| CN111298751A (en) * | 2020-04-08 | 2020-06-19 | 哈尔滨强石新材料技术开发股份有限公司 | Polycarboxylate water reducing agent system of processing |
| CN112792995A (en) * | 2021-02-05 | 2021-05-14 | 王硕 | Concrete compounding device for building engineering |
| CN113105141A (en) * | 2021-03-26 | 2021-07-13 | 唐山冀东水泥外加剂有限责任公司 | Early-strength polycarboxylate superplasticizer and preparation method thereof |
| CN214819654U (en) * | 2021-04-27 | 2021-11-23 | 河南建筑职业技术学院 | High-efficient concrete mixing device is used in engineering |
| CN113634183A (en) * | 2021-09-09 | 2021-11-12 | 四川宇砼建材有限公司 | Preparation device and method of slow-release water reducing agent capable of being dried |
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