CN111018396A - Antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent and preparation method thereof - Google Patents
Antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent and preparation method thereof Download PDFInfo
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- CN111018396A CN111018396A CN201911211108.4A CN201911211108A CN111018396A CN 111018396 A CN111018396 A CN 111018396A CN 201911211108 A CN201911211108 A CN 201911211108A CN 111018396 A CN111018396 A CN 111018396A
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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
- 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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- Engineering & Computer Science (AREA)
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Abstract
400 parts of methallyl alcohol polyoxyethylene ether 380-containing sodium silicate, 3.5-4.5 parts of hydrogen peroxide, 2-2.5 parts of mercaptopropionic acid, 0.5-1.0 part of vitamin C, 35-40 parts of acrylic acid, 15-18 parts of caustic soda flakes, 10-20 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 5-8 parts of dimethylacetamide, 8-15 parts of β -glucan, 5-10 parts of a water-based antirust agent and 340 parts of water 300-containing sodium silicate.
Description
Technical Field
The invention relates to an antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent and a preparation method thereof, belonging to the technical field of water reducing agent processing.
Background
The water reducing agent is a concrete admixture capable of reducing the water consumption for mixing under the condition of maintaining the slump constant of concrete basically. Most of them are anionic surfactants, such as lignosulfonate and naphthalene sulfonate formaldehyde polymer. After the concrete mixture is added, the dispersion effect on cement particles is achieved, the workability of the concrete mixture can be improved, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved.
With the increasing requirements on the durability and strength of concrete buildings in engineering construction and application, the requirement is to develop a water reducing agent with higher performance, the existing high-efficiency water reducing agents comprise naphthalene high-efficiency water reducing agents, melamine high-efficiency water reducing agents, sulfamate water reducing agents, aliphatic water reducing agents and the like, and due to the factors of low water reducing rate, poor slump retention, easy obvious retardation, high alkali content and the like, the technology and the requirements of modern concrete are difficult to meet, and in addition, the modern buildings also provide extremely high requirements on the antirust performance of the concrete. The present invention aims to solve this technical problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
400 parts of methallyl alcohol polyoxyethylene ether 380-containing organic solvent, 3.5-4.5 parts of hydrogen peroxide, 2-2.5 parts of mercaptopropionic acid, 0.5-1.0 part of vitamin C, 35-40 parts of acrylic acid, 15-18 parts of caustic soda flakes, 10-20 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 5-8 parts of dimethylacetamide, 8-15 parts of β -glucan, 5-10 parts of a water-based antirust agent and 340 parts of water 300-containing organic solvent.
In the formula of the water reducing agent, a certain amount of the auxiliary agent is added, so that the dispersibility can be improved, the organic reaction can be promoted, the reaction efficiency can be accelerated, particularly, whether the 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and the dimethylacetamide are combined or not has great influence on the reaction efficiency and the water reducing effect, and the combined use amount of the two auxiliary agents is particularly sensitive and can not achieve the ideal effect if the two auxiliary agents are slightly more or less in practice.
In addition, in order to improve the antirust effect of the concrete after the water reducing agent is used, a certain amount of antirust agent is added into the reducing agent, the film forming property of the antirust agent and the contact surface of metal is considered, the antirust effect is improved, and the environmental protection performance is considered, the applicant experiments a plurality of possible film forming additives, finally β -glucan and β -glucan are selected as biological macromolecules, on one hand, the biological macromolecules can be used as carriers to load active ingredients of the antirust agent, and in addition, after the concrete is dried, the β -glucan is easy to form a film, a uniform film layer can be formed on the contact surface of the concrete and the metal, the antirust agent is dispersed, a stable antirust interface is formed, and the antirust effect is improved.
Preferably, the food is processed by the following raw materials in parts by weight:
390 parts of methallyl alcohol polyoxyethylene ether, 3.75 parts of hydrogen peroxide, 2.125 parts of mercaptopropionic acid, 0.875 part of vitamin C, 38.5 parts of acrylic acid, 16.5 parts of caustic soda flakes, 15 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 6 parts of dimethylacetamide, 10 parts of β -glucan, 8 parts of a water-based antirust agent and 325 parts of water.
A preparation method of an antirust high slump loss resistant polycarboxylic acid high-performance water reducer comprises the following steps:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
step S3: preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, preparing water-soluble glucan and a water-based antirust agent into a material D, respectively dripping A, B, C and the material D into the material system obtained in the step S2, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the formula amount of flake alkali.
Preferably, in step S1, the amount of water is not less than 70% of the total formula amount.
Preferably, in step S2, the reaction temperature is 40-45 ℃ and the reaction time is 0.5-1 h.
Preferably, in step S3, the material A and D are dropped for 2.5h, the material B is dropped for 2h, and the material C is dropped for 2 h.
The invention has the beneficial effects that: in the formula of the water reducing agent, a certain amount of the auxiliary agent is added, so that the dispersibility can be improved, the organic reaction can be promoted, the reaction efficiency can be accelerated, particularly, whether the 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and the dimethylacetamide are combined or not has great influence on the reaction efficiency and the water reducing effect, and the combined use amount of the two auxiliary agents is particularly sensitive and can not achieve the ideal effect if the two auxiliary agents are slightly more or less in practice.
In addition, in order to improve the antirust effect of the concrete after the water reducer is used, a certain amount of antirust agent is added into the water reducer, the film forming property and the antirust effect of the antirust agent and a metal contact surface are considered, and the environment-friendly performance is considered, the applicant experiments a plurality of possible film forming additives, finally β -glucan and β -glucan are selected as biological macromolecules, and can be used as a carrier to load active ingredients of the antirust agent, in addition, after the concrete is dried, β -glucan is extremely easy to form a film, a relatively uniform film layer can be formed on the contact surface of the concrete and the metal, the antirust agent is dispersed, a stable antirust interface is formed, and the antirust effect is improved.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples.
Example 1:
an antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
380 parts of methallyl alcohol polyoxyethylene ether, 3.5 parts of hydrogen peroxide, 2 parts of mercaptopropionic acid, 0.5 part of vitamin C, 35 parts of acrylic acid, 15 parts of caustic soda flakes, 10 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 5 parts of dimethylacetamide, 8 parts of β -glucan, 5 parts of water-based antirust agent and 300 parts of water
The method of preparation of example 1, the method steps are as follows:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
and S3, preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, preparing β -glucan and a water-based antirust agent into a material D, respectively dropwise adding the materials A, B, C and D into the material system of the step S2, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet base with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 40 ℃, the reaction time is 1h, in step S3, the materials A and D are dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
Example 2:
an antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
400 parts of methallyl alcohol polyoxyethylene ether, 4.5 parts of hydrogen peroxide, 2.5 parts of mercaptopropionic acid, 1.0 part of vitamin C, 40 parts of acrylic acid, 18 parts of caustic soda flakes, 20 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 8 parts of dimethylacetamide, 15 parts of β -glucan, 10 parts of a water-based antirust agent and 340 parts of water.
The method of preparation of example 2, the method steps are as follows:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
and S3, preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, preparing β -glucan and a water-based antirust agent into a material D, respectively dropwise adding the materials A, B, C and D into the material system of the step S2, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet base with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 45 ℃, the reaction time is 0.5h, in step S3, the materials A and D are dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
Example 3:
an antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
390 parts of methallyl alcohol polyoxyethylene ether, 3.75 parts of hydrogen peroxide, 2.125 parts of mercaptopropionic acid, 0.875 part of vitamin C, 38.5 parts of acrylic acid, 16.5 parts of caustic soda flakes, 15 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 6 parts of dimethylacetamide, 10 parts of β -glucan, 8 parts of a water-based antirust agent and 325 parts of water.
The method of preparation of example 3, the method steps are as follows:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
and S3, preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, preparing β -glucan and a water-based antirust agent into a material D, respectively dropwise adding the materials A, B, C and D into the material system of the step S2, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet base with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 42 ℃, the reaction time is 0.75h, in step S3, the materials A and D are dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
Comparative example 1:
a high slump retaining type polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
380 parts of methallyl alcohol polyoxyethylene ether, 3.5 parts of hydrogen peroxide, 2 parts of mercaptopropionic acid, 0.5 part of vitamin C, 35 parts of acrylic acid, 15 parts of caustic soda flakes, 10 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 5 parts of dimethylacetamide and 300 parts of water
The method of preparation of example 1, the method steps are as follows:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
step S3: preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, respectively dripping A, B, C materials into the material system obtained in the step S2 by using the balance of water, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet base with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 40 ℃, the reaction time is 1h, in step S3, the material A is dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
Comparative example 2:
a high slump retaining type polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
400 parts of methallyl alcohol polyoxyethylene ether, 4.5 parts of hydrogen peroxide, 2.5 parts of mercaptopropionic acid, 1.0 part of vitamin C, 40 parts of acrylic acid, 18 parts of caustic soda flakes, 20 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 8 parts of dimethylacetamide and 340 parts of water.
The method of preparation of example 2, the method steps are as follows:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
step S3: preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, respectively dripping A, B, C materials into the material system obtained in the step S2 by using the balance of water, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet base with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 45 ℃, the reaction time is 0.5h, in step S3, the material A is dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
Comparative example 3:
a high slump retaining type polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
390 parts of methallyl alcohol polyoxyethylene ether, 3.75 parts of hydrogen peroxide, 2.125 parts of mercaptopropionic acid, 0.875 part of vitamin C, 38.5 parts of acrylic acid, 16.5 parts of caustic soda flakes, 15 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 6 parts of dimethylacetamide and 325 parts of water.
The method of preparation of example 3, the method steps are as follows:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
step S3: preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, respectively dripping A, B, C materials into the material system obtained in the step S2 by using the balance of water, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet base with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 42 ℃, the reaction time is 0.75h, in step S3, the material A is dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
Comparative example 4:
a high slump retaining type polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
390 parts of methallyl alcohol polyoxyethylene ether, 3.75 parts of hydrogen peroxide, 2.125 parts of mercaptopropionic acid, 0.875 part of vitamin C, 38.5 parts of acrylic acid, 16.5 parts of caustic soda flakes and 325 parts of water.
The preparation method of comparative example 1, comprising the following steps:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
step S3: preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, respectively dripping A, B materials into the material system obtained in the step S2 by using the balance of water, carrying out heat preservation reaction for 1-2 hours, and neutralizing the solution by using the flake caustic soda with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 42 ℃, the reaction time is 0.75h, in step S3, the material A is dripped out within 2.5h, and the material B is dripped out within 2 h.
Comparative example 5:
a high slump retaining type polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
390 parts of methallyl alcohol polyoxyethylene ether, 3.75 parts of hydrogen peroxide, 2.125 parts of mercaptopropionic acid, 0.875 part of vitamin C, 38.5 parts of acrylic acid, 16.5 parts of caustic soda flakes, 15 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and 325 parts of water.
The preparation method of comparative example 2, which comprises the following steps:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
step S3: preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride into a material C, respectively dripping A, B, C materials into the material system obtained in the step S2 by using the balance of water, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the flake caustic soda with the formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 42 ℃, the reaction time is 0.75h, in step S3, the material A is dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
Comparative example 6:
an antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent is prepared by processing the following raw materials in parts by weight:
390 parts of methallyl alcohol polyoxyethylene ether, 3.75 parts of hydrogen peroxide, 2.125 parts of mercaptopropionic acid, 0.875 part of vitamin C, 38.5 parts of acrylic acid, 16.5 parts of caustic soda flakes, 6 parts of dimethylacetamide and 325 parts of water.
The preparation method of comparative example 3, comprising the following steps:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
step S3: preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing dimethylacetamide into a material C, respectively dropwise adding A, B, C into the material system obtained in the step S2 by using the balance of water, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet alkali in a formula amount.
Specifically, in step S1, the amount of water is not less than 70% of the total formula amount, in step S2, the reaction temperature is 42 ℃, the reaction time is 0.75h, in step S3, the material A is dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
The water reducing agents of examples 1 to 3 and comparative examples 1 to 6 were used in the formulation of concrete, with an addition of 0.5%, and the standard performance indexes of concrete doped with the water reducing agent were as follows:
subject: nine groups of 42.5 ordinary silica cement are taken as experimental objects, and the 42.5 ordinary silica cement in each group is 1m3Is matched with 3m3The sand and stone are divided into 10 square cement boards with the thickness of 10 cm.
The experimental method comprises the following steps: the performance of the water reducing agent of the examples and the water reducing agent of the comparative example (the addition amount is 0.5%) is tested according to a water reducing rate test, a gas content test, a setting time test, a compressive strength ratio and a shrinkage ratio; the test time was 30 days. The average values of comparative examples 1 to 3 are as follows:
the average value of the test data for the water reducing agents of comparative examples 4 to 6 for the experimental group is as follows:
the average of the test data for the experimental groups of reducers of examples 1-3 of the present application is as follows:
the water reducing agents of examples 1 to 3 and comparative examples 1 to 6 were used for the test of rust prevention by the following test methods: nine No. 45 steel sheets of 10cm by 1cm by 2mm were polished, immersed in the water reducing agents of examples 1 to 3 and comparative examples 1 to 6, respectively, and hung in a humidity chamber, and kept at a humidity of 95% and a temperature of 45 ℃ for 50 days, and the test pieces were compared in terms of the degree of rusting or the degree of remaining rustless, and the results were as follows:
| example 1 | Can keep rust-free and rust-free for 45 days |
| Example 2 | Can keep the rust-free and rust-free for 48 days |
| Example 3 | Can keep the rust-free and rust-free for 50 days |
| Comparative example 1 | Can keep the rust-free for 40 days and irregular rust spots starting to be sporadic after 41 days |
| Comparative example 2 | Can keep rust-free for 41 days and irregular rust spots starting to be sporadic after 42 days |
| Comparative example 3 | Can keep the rust-free for 40 days and irregular rust spots starting to be sporadic after 40 days |
| Comparative example 4 | Can keep rust-free for 30 days, and has more rust spots after 31 days |
| Comparative example 5 | Can keep rust-free for 32 days, and has more rust spots after 33 days |
| Comparative example 6 | Can keep rust-free for 33 days, and has more rust spots after 34 days |
The test results show that the cement board prepared from the water reducer is superior to the cement board prepared from the water reducer of the comparative example. The water reducer can embody the characteristics of high slump loss resistance, high water reducing rate and short setting time, and has a prominent antirust effect. .
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (6)
1. An antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent is characterized by being prepared from the following raw materials in parts by weight:
400 parts of methallyl alcohol polyoxyethylene ether 380-containing organic solvent, 3.5-4.5 parts of hydrogen peroxide, 2-2.5 parts of mercaptopropionic acid, 0.5-1.0 part of vitamin C, 35-40 parts of acrylic acid, 15-18 parts of caustic soda flakes, 10-20 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 5-8 parts of dimethylacetamide, 8-15 parts of β -glucan, 5-10 parts of a water-based antirust agent and 340 parts of water 300-containing organic solvent.
2. The antirust high slump retaining type polycarboxylic acid high-performance water reducing agent of claim 1, which is prepared by processing the following raw materials in parts by weight:
390 parts of methallyl alcohol polyoxyethylene ether, 3.75 parts of hydrogen peroxide, 2.125 parts of mercaptopropionic acid, 0.875 part of vitamin C, 38.5 parts of acrylic acid, 16.5 parts of caustic soda flakes, 15 parts of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride, 6 parts of dimethylacetamide, 10 parts of β -glucan, 8 parts of a water-based antirust agent and 325 parts of water.
3. A preparation method of the antirust high slump retaining type polycarboxylic acid high-performance water reducing agent disclosed by claim 1 or 2 is characterized by comprising the following steps:
step S1, adding methallyl alcohol polyoxyethylene ether and part of water with the formula amount into a reaction kettle, and heating to 40 +/-2 ℃ for later use;
step S2: adding hydrogen peroxide into the material obtained in the step S1, and reacting for a period of time;
and S3, preparing mercaptopropionic acid and vitamin C into a material A, preparing acrylic acid into a material B, preparing 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and dimethylacetamide into a material C, preparing β -glucan and a water-based antirust agent into a material D, respectively dropwise adding the materials A, B, C and D into the material system of the step S2, reacting for 1-2 hours under heat preservation, and neutralizing the solution by using the tablet base with the formula amount.
4. The preparation method of the antirust high slump loss resistant polycarboxylic acid high-performance water reducing agent according to claim 3, wherein in the step S1, the amount of water is not less than 70% of the total formula amount.
5. The preparation method of the antirust high slump loss resistant polycarboxylic acid high-performance water reducer as claimed in claim 3, wherein in step S2, the reaction temperature is 40-45 ℃ and the reaction time is 0.5-1 h.
6. The preparation method of the antirust high slump loss resistant polycarboxylic acid high performance water reducer as claimed in claim 3, wherein in step S3, the material A and the material D are dripped out within 2.5h, the material B is dripped out within 2h, and the material C is dripped out within 2 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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