CN105198268A - Retarding water reducer and preparation method thereof - Google Patents
Retarding water reducer and preparation method thereof Download PDFInfo
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- CN105198268A CN105198268A CN201410306625.0A CN201410306625A CN105198268A CN 105198268 A CN105198268 A CN 105198268A CN 201410306625 A CN201410306625 A CN 201410306625A CN 105198268 A CN105198268 A CN 105198268A
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Abstract
The invention relates to a concrete admixture technology, and provides a retarding water reducer and a preparation method thereof. The retarding water reducer is produced from the following raw materials in parts by weight: 100 parts of TPEG, 0.3-0.6 part of hydrogen peroxide, 0.2-0.6 part of mercaptoacetic acid, 10-15 parts of acrylic acid, 0.2-0.3 part of ascorbic acid and 190-300 parts of water. The preparation condition of the preparation method of the retarding water reducer can be met through only simply adjusting the temperature, the preparation technology is simple, and the preparation method is convenient to implement; the prepared retarding water reducer conforms to the construction requirement, the coagulation time of concrete can be prolonged to 2 hours or above, and sufficient opening time is provided for construction.
Description
Technical field
The present invention relates to water reducer technical field, specifically refer to a kind of retarding water reducer and preparation method thereof.
Background technology
Material very is widely used in the engineerings such as concrete is building, building, water conservancy, high-speed railway and motorway, newly-built concrete concentrated compactness station, the current each big city of China can provide the concrete of stable high-quality, and this can accelerate the progress of building operation undoubtedly and improve construction quality.The increase of concrete demand, facilitates the development of concrete admixture technology, and concrete admixture has become requisite a kind of important component in concrete, in concrete production technology, play central role, is the key determining concrete quality.
Water reducer refers under concrete workability and cement consumption permanence condition, can reduce mixing water amount, improve concrete strength; Or under concrete workability and intensity permanence condition, save the admixture of cement consumption.Water reducer can reduce the magnetism between cement granules greatly, it is by means of polar adsorption, to cement, there is strong dissemination, the water in solidifying flco can be discharged, effectively destroy and hinder intergranular flocculation reaction, greatly reduction mixing water amount, improve concrete intensity and workability, significantly reduce aperture and total porosity, change the capillary-size pore structure after concrete hardening, final anti-permeability performance and the degree of compactness improving concrete structure.Water reducer, except above-mentioned effect, also has following several respects effect: improve frost resistance, be conducive to winter construction; Increase weather resistance, avoid concrete building structures to leak; Reduce the shrinking percentage of concrete setting, increase resistance to chemical corrosion.According to the needs of engineering, water reducer is divided into a variety of, comprises early-strength type water reducer, shrinkage type water reducer, thickening type water reducer, incremental type water reducer etc.
In numerous high-performance water reducing agent, it is high that the poly carboxylic acid series water reducer with comb shaped molecular structure has water-reducing rate, advantages such as concrete slump gradual loss is little, and volume is low and become the focus of current concrete admixture research and development.Existing water reducer, production technique is very complicated, and reaction conditions especially temperature condition is harsh, wayward, and reaction is high to equipment requirements, is unfavorable for industrial production.
Summary of the invention
The present invention proposes a kind of retarding water reducer and preparation method thereof, for solving existing water reducer preparation technology complicated operation, requires harsh problem to processing environment.
Technical scheme of the present invention is achieved in that
A kind of retarding water reducer, produces by following parts by weight of raw materials and obtains: isopentenol polyoxyethylene ether 100 parts, 0.3 ~ 0.6 part, hydrogen peroxide, Thiovanic acid 0.2 ~ 0.6 part, 10 ~ 15 parts, vinylformic acid, 0.2 ~ 0.3 part, xitix, 190 ~ 300 parts, water.
A kind of retarding water reducer, produces by following parts by weight of raw materials and obtains: isopentenol polyoxyethylene ether 100 parts, 0.4 ~ 0.5 part, hydrogen peroxide, Thiovanic acid 0.3 ~ 0.4 part, 12 ~ 14 parts, vinylformic acid, 0.2 ~ 0.3 part, xitix, 172 ~ 223 parts, water.
A preparation method for above-mentioned retarding water reducer, comprises the steps:
The first step, control temperature are 30 DEG C ~ 50 DEG C;
Second step, water intaking 80 ~ 130 parts and isopentenol polyoxyethylene ether 100 parts, add reactor, stir 10 ~ 30 minutes;
3rd step, get 0.3 ~ 0.6 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 10 ~ 30 minutes;
4th step, water intaking 20-30 part and Thiovanic acid 0.2 ~ 0.6 part mixing, be then added drop-wise in aforesaid reaction vessel;
5th step, water intaking 20-30 part and the mixing of 10 ~ 15 parts, vinylformic acid, be then added drop-wise in aforesaid reaction vessel;
6th step, water intaking 20-30 part and the mixing of 0.2 ~ 0.3 part, xitix, be then added drop-wise in aforesaid reaction vessel;
7th step, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH3 ~ 8 part and the mixing of 50 ~ 80 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.2 ~ 7.0 in 15 ~ 30 minutes.
In preferred scheme, described 4th step also comprises: controlling time for adding is 30 ~ 180 minutes.
In preferred scheme, described 5th step also comprises: controlling time for adding is 30 ~ 180 minutes.
In preferred scheme, described 6th step also comprises: controlling time for adding is 30 ~ 180 minutes.
A preparation method for above-mentioned retarding water reducer, comprises the steps:
The first step, control temperature are 30 DEG C ~ 50 DEG C;
Second step, water intaking 90 ~ 100 parts and isopentenol polyoxyethylene ether 100 parts, add reactor, stir 10 ~ 30 minutes;
3rd step, get 0.4 ~ 0.5 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 10 ~ 30 minutes;
4th step, water intaking 4 ~ 6 parts and Thiovanic acid 0.3 ~ 0.4 part mixing, be then added drop-wise in aforesaid reaction vessel, controlling time for adding is 30 ~ 180 minutes;
5th step, water intaking 4 ~ 6 parts and the mixing of 12 ~ 14 parts, vinylformic acid, be then added drop-wise in aforesaid reaction vessel, controlling time for adding is 30 ~ 180 minutes;
6th step, water intaking 24 ~ 31 parts and the mixing of 0.2 ~ 0.3 part, xitix, be then added drop-wise in aforesaid reaction vessel, controlling time for adding is 30 ~ 180 minutes;
7th step, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH3 ~ 8 part and the mixing of 50 ~ 80 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.2 ~ 7.0 in 15 ~ 30 minutes.
A using method for above-mentioned retarding water reducer, for the production of concrete, the weight percentage ranges controlling retarding water reducer in concrete is 0.2% ~ 1.8%.
Beneficial effect of the present invention is as follows:
The preparation method of retarding water reducer provided by the invention only needs simple adjustment temperature to meet preparation condition, and preparation technology is simple, is convenient to implement; Prepared retarding water reducer complex building requirement, can make concrete setting time extend to more than 2 hours, for construction operation provides the sufficient open hour.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Be further explained explanation below in conjunction with specific embodiment to the present invention, the water used in embodiment is deionized water.
Embodiment 1
Utilize reactor, prepare the water reducer of the present embodiment in accordance with the following steps:
1, open reactor power supply, start reactor controller, control temperature is 30 DEG C ~ 50 DEG C;
2, water intaking 80 ~ 130 parts and isopentenol polyoxyethylene ether (TPEG) 100 parts, adds reactor, stirs 10 ~ 30 minutes;
3, get 0.3 ~ 0.6 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 10 ~ 30 minutes;
4, water intaking 20 ~ 30 parts and Thiovanic acid 0.2 ~ 0.6 part mixing, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 ~ 180 minutes;
5, water intaking 20 ~ 30 parts and the mixing of 10 ~ 15 parts, vinylformic acid, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 ~ 180 minutes;
6, water intaking 20 ~ 30 parts and the mixing of 0.2 ~ 0.3 part, xitix, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 ~ 180 minutes;
7, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH3 ~ 8 part and the mixing of 50 ~ 80 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.2 ~ 7.0 in 15 ~ 30 minutes, the water reducer of the present embodiment can be obtained.
Wherein, each raw material is weight part; The frostproofer of total 1 ~ 2 part, hardening accelerator, retardant, softening agent and/or air entrapment agent can also be added in reactor after step 7, so as when to prepare concrete the performance of Concrete Structure.
The water reducer that above step obtains produces by following parts by weight of raw materials to obtain: isopentenol polyoxyethylene ether 100 parts, 0.3 ~ 0.6 part, hydrogen peroxide, Thiovanic acid 0.2 ~ 0.6 part, 10 ~ 15 parts, vinylformic acid, 0.2 ~ 0.3 part, xitix, 190 ~ 300 parts, water.
Embodiment 2
Prepare the water reducer of the present embodiment in accordance with the following steps:
1, open reactor power supply, start reactor controller, control temperature is 30 DEG C ~ 50 DEG C;
2, water intaking 90 ~ 100 parts and isopentenol polyoxyethylene ether 100 parts, adds reactor, stirs 10 ~ 30 minutes;
3, get 0.4 ~ 0.5 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 10 ~ 30 minutes;
4, water intaking 4 ~ 6 parts and Thiovanic acid 0.3 ~ 0.4 part mixing, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 ~ 180 minutes;
5, water intaking 4 ~ 6 parts and the mixing of 12 ~ 14 parts, vinylformic acid, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 ~ 180 minutes;
6, water intaking 24 ~ 31 parts and the mixing of 0.2 ~ 0.3 part, xitix, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 ~ 180 minutes;
7, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH3 ~ 8 part and the mixing of 50 ~ 80 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.2 ~ 7.0 in 15 ~ 30 minutes, the water reducer of the present embodiment can be obtained.
Wherein, each raw material is weight part; The frostproofer of total 1 ~ 2 part, hardening accelerator, retardant, softening agent and/or air entrapment agent can also be added in reactor after step 7, so as when to prepare concrete the performance of Concrete Structure.
The water reducer that above step obtains produces by following parts by weight of raw materials to obtain: isopentenol polyoxyethylene ether 100 parts, 0.4 ~ 0.5 part, hydrogen peroxide, Thiovanic acid 0.3 ~ 0.4 part, 12 ~ 14 parts, vinylformic acid, 0.2 ~ 0.3 part, xitix, 172 ~ 223 parts, water.
Embodiment 3
Utilize reactor, prepare the water reducer of the present embodiment in accordance with the following steps:
1, open reactor power supply, start reactor controller, control temperature is 30 DEG C;
2, water intaking 80 parts and isopentenol polyoxyethylene ether 100 parts, adds reactor, stirs 10 minutes;
3, get 0.3 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 10 minutes;
4, water intaking 20 parts and Thiovanic acid 0.2 part mixing, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 minutes;
5, water intaking 20 parts and the mixing of 10 parts, vinylformic acid, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 minutes;
6, water intaking 20 parts and the mixing of 0.2 part, xitix, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 30 minutes;
7, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH3 part and the mixing of 50 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.2 in 15 minutes, the water reducer of the present embodiment can be obtained.
Wherein, each raw material is weight part; The frostproofer of total 1 part, hardening accelerator, retardant, softening agent and/or air entrapment agent can also be added in reactor after step 7, so as when to prepare concrete the performance of Concrete Structure.
The water reducer that above step obtains produces by following parts by weight of raw materials to obtain: isopentenol polyoxyethylene ether 100 parts, 0.3 part, hydrogen peroxide, Thiovanic acid 0.2 part, 10 parts, vinylformic acid, 0.2 part, xitix, 190 parts, water.
Embodiment 4
Utilize reactor, prepare the water reducer of the present embodiment in accordance with the following steps:
1, open reactor power supply, start reactor controller, control temperature is 50 DEG C;
2, water intaking 130 parts and isopentenol polyoxyethylene ether 100 parts, adds reactor, stirs 30 minutes;
3, get 0.6 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 30 minutes;
4, water intaking 30 parts and Thiovanic acid 0.6 part mixing, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 180 minutes;
5, water intaking 30 parts and the mixing of 15 parts, vinylformic acid, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 180 minutes;
6, water intaking 30 parts and the mixing of 0.3 part, xitix, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 180 minutes;
7, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH8 part and the mixing of 80 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 7 in 30 minutes, the water reducer of the present embodiment can be obtained.
Wherein, each raw material is weight part; The frostproofer of total 2 parts, hardening accelerator, retardant, softening agent and/or air entrapment agent can also be added in reactor after step 7, so as when to prepare concrete the performance of Concrete Structure.
The water reducer that above step obtains produces by following parts by weight of raw materials to obtain: isopentenol polyoxyethylene ether 100 parts, 0.6 part, hydrogen peroxide, Thiovanic acid 0.6 part, 15 parts, vinylformic acid, 0.3 part, xitix, 300 parts, water.
Embodiment 5
Prepare the water reducer of the present embodiment in accordance with the following steps:
1, open reactor power supply, start reactor controller, control temperature is 40 DEG C;
2, water intaking 90 parts and isopentenol polyoxyethylene ether 100 parts, adds reactor, stirs 20 minutes;
3, get 0.4 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 20 minutes;
4, water intaking 40 parts and Thiovanic acid 0.3 part mixing, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 45 minutes;
5, water intaking 4 parts and the mixing of 12 parts, vinylformic acid, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 60 minutes;
6, water intaking 24 parts and the mixing of 0.2 part, xitix, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 50 minutes;
7, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH3 part and the mixing of 50 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.4 in 20 minutes, the water reducer of the present embodiment can be obtained.
Wherein, each raw material is weight part; The frostproofer of total 1.5 parts, hardening accelerator, retardant, softening agent and/or air entrapment agent can also be added in reactor after step 7, so as when to prepare concrete the performance of Concrete Structure.
The water reducer that above step obtains produces by following parts by weight of raw materials to obtain: isopentenol polyoxyethylene ether 100 parts, 0.4 part, hydrogen peroxide, Thiovanic acid 0.3 part, 12 parts, vinylformic acid, 0.2 part, xitix, 208 parts, water.
Embodiment 6
Prepare the water reducer of the present embodiment in accordance with the following steps:
1, open reactor power supply, start reactor controller, control temperature is 45 DEG C;
2, water intaking 100 parts and isopentenol polyoxyethylene ether 100 parts, adds reactor, stirs 15 minutes;
3, get 0.5 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 15 minutes;
4, water intaking 6 parts and Thiovanic acid 0.4 part mixing, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 105 minutes;
5, water intaking 6 parts and the mixing of 14 parts, vinylformic acid, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 120 minutes;
6, water intaking 31 parts and the mixing of 0.3 part, xitix, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 110 minutes;
7, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH6.3 part and the mixing of 80 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.8 in 15 ~ 30 minutes, the water reducer of the present embodiment can be obtained.
Wherein, each raw material is weight part; The frostproofer of total 1.5 parts, hardening accelerator, retardant, softening agent and/or air entrapment agent can also be added in reactor after step 7, so as when to prepare concrete the performance of Concrete Structure.
The water reducer that above step obtains produces by following parts by weight of raw materials to obtain: isopentenol polyoxyethylene ether 100 parts, 0.5 part, hydrogen peroxide, Thiovanic acid 0.4 part, 14 parts, vinylformic acid, 0.3 part, xitix, 223 parts, water.
Embodiment 7
Prepare the water reducer of the present embodiment in accordance with the following steps:
1, open reactor power supply, start reactor controller, control temperature is 35 DEG C;
2, water intaking 95 parts and isopentenol polyoxyethylene ether 100 parts, adds reactor, stirs 25 minutes;
3, get 0.45 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 25 minutes;
4, water intaking 5 parts and Thiovanic acid 0.35 part mixing, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 140 minutes;
5, water intaking 5 parts and the mixing of 13 parts, vinylformic acid, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 40 minutes;
6, water intaking 28 parts and the mixing of 0.25 part, xitix, is then added drop-wise in aforesaid reaction vessel, and controlling time for adding is 50 minutes;
7, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH5 part and the mixing of 65 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.6 in 20 minutes, the water reducer of the present embodiment can be obtained.
Wherein, each raw material is weight part; The frostproofer of total 1.6 parts, hardening accelerator, retardant, softening agent and/or air entrapment agent can also be added in reactor after step 7, so as when to prepare concrete the performance of Concrete Structure.
The water reducer that above step obtains produces by following parts by weight of raw materials to obtain: isopentenol polyoxyethylene ether 100 parts, 0.45 part, hydrogen peroxide, Thiovanic acid 0.35 part, 13 parts, vinylformic acid, 0.25 part, xitix, 198 parts, water.
The using method of retarding water reducer that above-described embodiment obtains is identical with existing known water reducer producing the use step in Concrete, institute's difference is that the weight percentage ranges of retarding water reducer in concrete is 0.2% ~ 1.8%, preferably 0.26%.Use the water reducer of above-described embodiment concrete setting time can be made to extend to more than 2 hours, for construction operation provides the sufficient open hour.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a retarding water reducer, is characterized in that: produce by following parts by weight of raw materials and obtain: isopentenol polyoxyethylene ether 100 parts, 0.3 ~ 0.6 part, hydrogen peroxide, Thiovanic acid 0.2 ~ 0.6 part, 10 ~ 15 parts, vinylformic acid, 0.2 ~ 0.3 part, xitix, 190 ~ 300 parts, water.
2. a retarding water reducer, is characterized in that: produce by following parts by weight of raw materials and obtain: isopentenol polyoxyethylene ether 100 parts, 0.4 ~ 0.5 part, hydrogen peroxide, Thiovanic acid 0.3 ~ 0.4 part, 12 ~ 14 parts, vinylformic acid, 0.2 ~ 0.3 part, xitix, 172 ~ 223 parts, water.
3. a preparation method for retarding water reducer as claimed in claim 1, is characterized in that: comprise the steps:
The first step, control temperature are 30 DEG C ~ 50 DEG C;
Second step, water intaking 80 ~ 130 parts and isopentenol polyoxyethylene ether 100 parts, add reactor, stir 10 ~ 30 minutes;
3rd step, get 0.3 ~ 0.6 part, hydrogen peroxide, join in aforesaid reaction vessel, and stir 10 ~ 30 minutes;
4th step, water intaking 20-30 part and Thiovanic acid 0.2 ~ 0.6 part mixing, be then added drop-wise in aforesaid reaction vessel;
5th step, water intaking 20-30 part and the mixing of 10 ~ 15 parts, vinylformic acid, be then added drop-wise in aforesaid reaction vessel;
6th step, water intaking 20-30 part and the mixing of 0.2 ~ 0.3 part, xitix, be then added drop-wise in aforesaid reaction vessel;
7th step, after dropping Thiovanic acid, vinylformic acid and xitix, get NaOH3 ~ 8 part and the mixing of 50 ~ 80 parts, water, then join in aforesaid reaction vessel, stir and make pH value reach 6.2 ~ 7.0 in 15 ~ 30 minutes.
4. the preparation method of retarding water reducer according to claim 3, is characterized in that: described 4th step also comprises: controlling time for adding is 30 ~ 180 minutes.
5. the preparation method of retarding water reducer according to claim 3, is characterized in that: described 5th step also comprises: controlling time for adding is 30 ~ 180 minutes.
6. the preparation method of retarding water reducer according to claim 3, is characterized in that: described 6th step also comprises: controlling time for adding is 30 ~ 180 minutes.
7. a using method for retarding water reducer as claimed in claim 1 or 2, for the production of concrete, is characterized in that: in concrete, the weight percentage ranges of retarding water reducer is 0.2% ~ 1.8%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107629171A (en) * | 2017-10-18 | 2018-01-26 | 汕头市汇强外加剂有限公司 | A kind of production method of non-evaporating curing concrete pile tube new polycarboxylic acid water reducer |
| CN109721272A (en) * | 2019-01-03 | 2019-05-07 | 河海大学 | A kind of magnesia retarder based on multi-vitamins, combined oxidation magnesium and application |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030494A (en) * | 2010-11-12 | 2011-04-27 | 河北金舵建材科技开发有限公司 | High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof |
-
2014
- 2014-06-30 CN CN201410306625.0A patent/CN105198268A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030494A (en) * | 2010-11-12 | 2011-04-27 | 河北金舵建材科技开发有限公司 | High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107629171A (en) * | 2017-10-18 | 2018-01-26 | 汕头市汇强外加剂有限公司 | A kind of production method of non-evaporating curing concrete pile tube new polycarboxylic acid water reducer |
| CN109721272A (en) * | 2019-01-03 | 2019-05-07 | 河海大学 | A kind of magnesia retarder based on multi-vitamins, combined oxidation magnesium and application |
| CN109721272B (en) * | 2019-01-03 | 2020-02-18 | 河海大学 | Magnesium oxide retarder based on composite vitamins, composite magnesium oxide and application |
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