CN112724408B - Defoaming functional material, defoaming polycarboxylate superplasticizer and preparation method thereof - Google Patents
Defoaming functional material, defoaming polycarboxylate superplasticizer and preparation method thereof Download PDFInfo
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
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- 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
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- 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
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
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Abstract
The invention relates to the technical field of concrete admixtures, and particularly relates to a defoaming functional material, a defoaming polycarboxylic acid water reducing agent and a preparation method thereof. The defoaming functional material is prepared by carrying out hydrosilylation reaction on alkynol and hydrogen-containing silicone oil; the defoaming type polycarboxylate superplasticizer is prepared by copolymerizing unsaturated polyoxyethylene ether monomers, the defoaming type functional material and unsaturated carboxylic acid. The defoaming functional material provided by the invention has a defoaming function and has hydrophilicity in an aqueous system; the defoaming polycarboxylate superplasticizer provided by the invention has high water reducing effect, simultaneously has defoaming and foam inhibiting functions, has strong defoaming capability and good stability, and effectively solves the problems of poor compatibility and poor air content control effect caused by poor placement stability due to poor compounding of the polycarboxylate superplasticizer and the defoaming agent.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, and particularly relates to a defoaming functional material, a defoaming polycarboxylate superplasticizer and a preparation method thereof
Background
The polycarboxylate superplasticizer has the advantages of high water reducing rate, adjustable molecular structure, environmental friendliness and the like. With the development of the concrete industry, the polycarboxylic acid water reducing agent is widely and rapidly applied to the improvement of various performance requirements of concrete.
With the wide application of the polycarboxylate superplasticizer, the problem of gas content brought by the polycarboxylate superplasticizer in the application process also becomes a difficult point which troubles the industry. The air bubbles are not required to be introduced in the concrete configuration and construction, wherein the air bubbles with the diameter of less than 50nm can obviously improve the frost resistance, impermeability and durability of the concrete, and can also improve the fluidity and the constructability of the concrete, thereby improving the quality of the concrete. However, the polycarboxylic acid water reducing agent has strong air entraining capability due to the characteristics of the molecular structure, bubbles with different sizes are introduced in the concrete preparation process, the air content is too high, and the performances of the concrete such as strength, appearance, durability and the like are seriously influenced.
At present, in order to solve the problems of the polycarboxylate water reducer, a proper amount of defoaming agent is mainly added into the polycarboxylate water reducer for compounding so as to control the gas content. The role of the defoaming agent in concrete is mainly two aspects, namely inhibiting the generation of bubbles in the concrete and destroying the bubbles to overflow air in the bubbles. The addition of the defoaming agent can reduce the defects of air holes, honeycombs, pitted surfaces and the like on the surface of the concrete and effectively improve the apparent quality of the concrete; the air content in the concrete can be reduced, and the compactness of the concrete is improved, so that the strength of the concrete is improved. At present, the types of defoaming agents applied to concrete are various, and the defoaming agents mainly comprise polyether defoaming agents, organosilicone defoaming agents, mineral oil defoaming agents and acetylene glycol foam control agents. The defoamer is generally added into concrete after being compounded with the water reducing agent to achieve the purpose of controlling bubbles, but the defoamer has poor compatibility and stability with the polycarboxylic acid water reducing agent, and is easy to separate after being placed for a long time, so that the action effect of the defoamer is influenced, and therefore, the method has a poor effect on controlling the gas content.
The invention discloses a composite high-performance polycarboxylate superplasticizer and a preparation method and application thereof, wherein the composite high-performance polycarboxylate superplasticizer is disclosed in the invention patent application with the publication number of CN110372255A and the publication number of 20191025, and relates to the technical field of concrete. The composite high-performance polycarboxylate superplasticizer is prepared from the following raw materials in parts by weight: 15-20 parts of a water-reducing polycarboxylate superplasticizer mother liquor, 10-15 parts of a viscosity-reducing polycarboxylate superplasticizer mother liquor, 20-30 parts of a slow-release polycarboxylate superplasticizer mother liquor, 10-15 parts of a hydration heat inhibitor, 2-5 parts of a retarder, 0-0.1 part of a consistency regulator, 0-0.06 part of an air entraining agent and 0-0.05 part of a defoaming agent. The patent application of the invention also discloses a composite high-performance water-reducing polycarboxylic acid water reducer obtained by compounding a polycarboxylic acid water reducer and a defoaming agent.
Disclosure of Invention
The method aims to solve the problems of poor compatibility and poor placement stability caused by the complex formulation of the polycarboxylate superplasticizer and the defoamer in the background art, and poor effect of controlling gas content.
The invention provides a defoaming functional material which is prepared by carrying out hydrosilylation on alkynol and hydrogen-containing silicone oil.
On the basis of the scheme, further, the ratio of the alkynol to the hydrogen-containing silicone oil is 50-100: 250 to 350.
On the basis of the scheme, the alkynol is one or more of 10-undecenol, 3, 5-dimethyl-1-hexyn-3-ol, 3-methyl-1-pentyn-3-ol, 1-hexyn-3-ol, 2-propyn-1-ol, 2-dimethylacetylenemethanol, 6-heptynol and 7-octyn-1-ol.
On the basis of the scheme, further, the hydrogen-containing silicone oil is one or a mixture of methyl hydrogen-containing silicone oil and ethyl hydrogen-containing silicone oil.
On the basis of the scheme, the hydrosilylation reaction temperature is 90-120 ℃.
The invention also provides a preparation method of the defoaming functional material, which comprises the following preparation steps: mixing alkynol and hydrogen-containing silicone oil, and carrying out hydrosilylation reaction to obtain the defoaming functional material.
On the basis of the scheme, a Speier catalyst is further added; the ratio of the alkynol, the hydrogen-containing silicone oil and the Speier catalyst is 50-100: 250-350: 0.015 to 0.02.
On the basis of the scheme, a polymerization inhibitor is further added; the polymerization inhibitor is at least one of 4-tert-butyl catechol, hydroquinone, 2, 5-di-tert-butyl hydroquinone, methyl hydroquinone and p-benzoquinone.
The invention provides a defoaming polycarboxylate superplasticizer which is prepared by copolymerizing an unsaturated polyoxyethylene ether monomer, a defoaming functional material and unsaturated carboxylic acid; the defoaming functional material is prepared by the defoaming functional material or the preparation method of the defoaming functional material.
On the basis of the scheme, further, the proportions of the unsaturated polyoxyethylene ether monomer, the defoaming functional material and the unsaturated carboxylic acid are as follows in parts by weight: 300-400: 5-20: 30-60.
On the basis of the scheme, the unsaturated polyoxyethylene ether monomer is one or more of allyl polyoxyethylene ether, methyl allyl polyoxyethylene ether and prenol polyoxyethylene ether, and the molecular weight of the unsaturated polyoxyethylene ether monomer is 600-3000.
On the basis of the scheme, further, the unsaturated carboxylic acid is at least one of acrylic acid, methacrylic acid and crotonic acid.
On the basis of the scheme, the copolymerization reaction temperature is 40-65 ℃.
The invention also provides a preparation method of the defoaming type polycarboxylate superplasticizer, which comprises the following preparation steps:
s100, mixing the defoaming functional material, an unsaturated polyoxyethylene ether monomer and water to obtain a solution A;
s200, adding an unsaturated carboxylic acid aqueous solution into the solution A to perform copolymerization reaction to obtain the defoaming polycarboxylic acid water reducing agent.
On the basis of the above scheme, further, in S100, the defoaming functional material, the unsaturated polyoxyethylene ether monomer and water are mixed and heated to obtain a solution a.
On the basis of the scheme, in the step S100, an oxidizing agent is further added to the solution a, and the oxidizing agent is at least one of hydrogen peroxide, sodium persulfate or ammonium persulfate.
On the basis of the scheme, a reducing agent and a chain transfer agent are further added into the S200; the reducing agent is at least one of ascorbic acid, sodium hypophosphite, sodium formaldehyde sulfoxylate or sodium bisulfite; the chain transfer agent is at least one of thioglycolic acid, mercaptopropionic acid and mercaptoethanol.
According to the invention, alkynol is adopted to modify organic silicon to prepare the defoaming functional material, the defoaming functional material has a defoaming function, and alcoholic hydroxyl in the defoaming functional material can generate hydrogen bonds with water, so that the defoaming functional material has hydrophilicity in a water-based system. The defoaming type polycarboxylate water reducer provided by the invention is introduced with the defoaming type functional material by a chemical copolymerization method, so that the defoaming type polycarboxylate water reducer has the advantages of good water reducing effect, strong stability and good defoaming and foam inhibiting functions.
Compared with the prior art, the defoaming type polycarboxylate water reducer provided by the invention has high water reducing effect, simultaneously has defoaming and foam inhibiting functions, is strong in defoaming capability and good in stability, and effectively solves the problems of poor compatibility and poor gas content control effect caused by poor placement stability due to the fact that a polycarboxylate water reducer and a defoaming agent are compounded.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the embodiments of the present invention, and obviously, the described embodiments are a part of the embodiments of the present invention, but not all 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.
The invention provides a preparation method of a defoaming type polycarboxylate superplasticizer, which comprises the following steps:
1. preparing the defoaming functional material by hydrosilation reaction:
mixing 50-100 parts by weight of alkynol, 250-350 parts by weight of hydrogen-containing silicone oil and 1.0-3.0 parts by weight of polymerization inhibitor. Stirring and heating to 50-70 ℃ at the rotating speed of 200 revolutions per minute, dropwise adding 0.015-0.020 part by weight of Speier catalyst within 5-15 min, heating to 90-120 ℃, keeping the temperature for 3-8 h, vacuumizing for 0.5h under 0.01MPa, and removing low-boiling-point substances through reduced pressure distillation to obtain the defoaming functional material.
2. Preparing a defoaming polycarboxylic acid water reducing agent:
mixing 300-400 parts by weight of unsaturated polyoxyethylene ether monomer with the molecular weight of 600-3000, 5.0-20.0 parts by weight of defoaming functional material, 1.0-3.0 parts by weight of oxidant and 200-260 parts by weight of water, and heating to obtain a solution A;
preparing a solution B from 30.0-60.0 parts by weight of unsaturated carboxylic acid, 0.3-3.0 parts by weight of reducing agent and 150-220 parts by weight of water;
preparing 1.0-4.0 parts by weight of chain transfer agent and 20-30 parts by weight of water into a solution C;
placing the solution A into a 250ml four-neck flask, stirring and heating to 40-65 ℃, respectively dropwise adding the solution B and the solution C into the solution A for 1.5-3.0 h, preserving heat for 1.0-2.0 h after dropwise adding is finished, and carrying out copolymerization reaction; and then adjusting the pH value to 6.0-7.0 by using 30-32% liquid alkali in mass concentration, and adjusting the solid content to 50% to obtain the defoaming polycarboxylic acid water reducing agent.
Wherein the alkynol is one or more of 10-undecenol, 3, 5-dimethyl-1-hexyne-3-ol, 3-methyl-1-pentyne-3-ol, 1-hexyne-3-ol, 2-propyne-1-ol, 2-dimethylacetylene methanol, 6-heptynol and 7-octyne-1-ol; the hydrogen-containing silicone oil is one or a mixture of methyl hydrogen-containing silicone oil and ethyl hydrogen-containing silicone oil; the polymerization inhibitor is at least one of 4-tert-butyl catechol, hydroquinone, 2, 5-di-tert-butyl hydroquinone, methyl hydroquinone and p-benzoquinone; the unsaturated polyoxyethylene ether monomer is one or more of allyl polyoxyethylene ether, methyl allyl polyoxyethylene ether and prenol polyoxyethylene ether; the unsaturated carboxylic acid is at least one of acrylic acid, methacrylic acid and crotonic acid; the oxidant is at least one of hydrogen peroxide, sodium persulfate or ammonium persulfate; the reducing agent is at least one of ascorbic acid, sodium hypophosphite, sodium formaldehyde sulfoxylate or sodium bisulfite; the chain transfer agent is at least one of thioglycolic acid, mercaptopropionic acid and mercaptoethanol.
The invention also provides the following examples and comparative examples:
example 1
1. Preparing the defoaming functional material by hydrosilation reaction:
70 parts by weight of alkynol 2-propyn-1-ol, 250 parts by weight of ethyl hydrogen-containing silicone oil and 1.8 parts by weight of polymerization inhibitor 4-tert-butyl catechol were mixed. Stirring and heating at the rotating speed of 200 r/min for 65 ℃, dropwise adding 0.018 weight part of Speier catalyst within 12min, heating to 110 ℃, keeping the temperature for 6h, vacuumizing at 0.01MPa for 0.5h, and removing low-boiling-point substances by reduced pressure distillation to obtain the defoaming functional material.
2. Preparing a defoaming polycarboxylic acid water reducing agent:
mixing and heating 300 parts by weight of allyl polyoxyethylene ether with the molecular weight of 1500, 10 parts by weight of defoaming functional material, 1.5 parts by weight of oxidant sodium persulfate and 200 parts by weight of water to obtain solution A;
preparing solution B from 38 parts by weight of acrylic acid, 0.8 part by weight of reducing agent ascorbic acid and 180 parts by weight of water;
preparing 2.0 parts by weight of chain transfer agent thioglycolic acid and 20 parts by weight of water into a solution C;
placing the solution A in a 250ml four-neck flask, stirring and heating to 45 ℃, respectively dropwise adding the solution B and the solution C into the solution A for 1.5h, and preserving heat for 1.5h after dropwise addition to perform copolymerization reaction; and (3) adjusting the pH value to 6.5 by using liquid caustic soda with the mass concentration of 30-32%, and adjusting the solid content to 50% to obtain the defoaming polycarboxylic acid water reducing agent.
Example 2
1. Preparing the defoaming functional material by hydrosilation reaction:
50 parts by weight of 3, 5-dimethyl-1-hexyne-3-ol, 300 parts by weight of methyl hydrogen silicone oil and 2.0 parts by weight of polymerization inhibitor hydroquinone are mixed. Stirring and heating to 70 ℃ at the rotating speed of 200 r/min, dropwise adding 0.020 parts by weight of Speier catalyst within 15min, heating to 110 ℃, keeping the temperature for 8h, vacuumizing for 0.5h under 0.01MPa, and removing low-boiling-point substances by reduced pressure distillation to obtain the defoaming functional material.
2. Preparing a defoaming polycarboxylic acid water reducing agent:
mixing 350 parts by weight of methyl allyl polyoxyethylene ether with molecular weight of 2000, 15 parts by weight of defoaming functional material, 2.5 parts by weight of oxidant ammonium persulfate and 250 parts by weight of water, and heating to obtain solution A;
preparing 50.0 parts by weight of methacrylic acid, 2.5 parts by weight of reducing agent sodium bisulfite and 190 parts by weight of water into solution B;
preparing 3.0 parts by weight of chain transfer agent mercaptopropionic acid and 25 parts by weight of water into a solution C;
placing the solution A in a 250ml four-neck flask, stirring and heating to 60 ℃, respectively dropwise adding the solution B and the solution C into the solution A for 2.0 hours, and preserving heat for 2.0 hours after dropwise adding to perform copolymerization reaction; and (3) adjusting the pH value to 7.0 by using liquid caustic soda with the mass concentration of 30-32%, and adjusting the solid content to 50% to obtain the defoaming polycarboxylic acid water reducing agent.
Example 3
1. Preparing the defoaming functional material by hydrosilation reaction:
100 parts by weight of alkynol 7-octyn-1-ol, 350 parts by weight of ethyl hydrogen-containing silicone oil and 3.0 parts by weight of polymerization inhibitor p-benzoquinone are mixed. Stirring at the rotation speed of 200 r/min, heating to 50 ℃, dropwise adding 0.020 part by weight of Speier catalyst within 5min, heating to 110 ℃, keeping the temperature for 4h, vacuumizing under 0.01MPa for 0.5h, and removing low-boiling-point substances by reduced pressure distillation to obtain the defoaming functional material.
2. Preparing a defoaming polycarboxylic acid water reducing agent:
mixing and heating 400 parts by weight of prenyl polyoxyethylene ether with the molecular weight of 3000, 20 parts by weight of defoaming functional materials, 3.0 parts by weight of oxidant hydrogen peroxide and 260 parts by weight of water to obtain a solution A;
preparing a solution B from 40.0 parts by weight of acrylic acid, 20 parts by weight of crotonic acid, 3 parts by weight of reducing agent sodium bisulfite and 220 parts by weight of water;
preparing 4.0 parts by weight of chain transfer agent mercaptoethanol and 30 parts by weight of water into a solution C;
placing the solution A in a 250ml four-neck flask, stirring and heating to 65 ℃, respectively dropwise adding the solution B and the solution C into the solution A for 3.0 hours, and preserving heat for 2.0 hours after dropwise adding to perform copolymerization reaction; and (3) adjusting the pH value to 6.0 by using liquid caustic soda with the mass concentration of 30-32%, and adjusting the solid content to 50% to obtain the defoaming polycarboxylic acid water reducing agent.
Comparative example 1
Based on example 2, the hydrogen-containing silicone oil was not modified by the hydrosilylation reaction but introduced directly. Other preparation conditions are kept unchanged, and the specific implementation process is as follows:
mixing 350 parts by weight of methyl allyl polyoxyethylene ether with molecular weight of 2000, 15 parts by weight of hydrogen-containing silicone oil, 2.5 parts by weight of oxidant ammonium persulfate and 250 parts by weight of water, and heating to obtain solution A;
preparing 50.0 parts by weight of methacrylic acid, 2.5 parts by weight of reducing agent sodium bisulfite and 190 parts by weight of water into solution B;
preparing 3.0 parts by weight of chain transfer agent mercaptopropionic acid and 25 parts by weight of water into a solution C;
placing the solution A in a 250ml four-neck flask, stirring and heating to 60 ℃, respectively dropwise adding the solution B and the solution C into the solution A for 2.0 hours, and preserving heat for 2.0 hours after dropwise adding to perform copolymerization reaction; and (3) adjusting the pH value to 7.0 by using 30-32% of liquid alkali in mass concentration, and adjusting the solid content to 50% to obtain a prepared product.
Comparative example 2
The type of the polycarboxylic acid type water reducing agent sold in the market is JS-1.
Comparative example 3
The commercially available polycarboxylic acid type water reducing agent with the model of JS-1 and the commercially available defoaming agent with the model of EX-701 are compounded, the standing time is 12 hours, and the phenomenon of floating of upper-layer oily matter appears after the two are compounded and placed through appearance observation.
The surface tension values of the defoaming polycarboxylic acid water reducing agents prepared in examples 1 to 3, the product prepared in comparative example 1, the commercially available water reducing agent of comparative example 2, and the water reducing agent and defoamer in comparative example 3 were measured by an automatic interfacial tensiometer, and the results are shown in table 1.
Standard cement is adopted, and the concrete mixing proportion is as follows: 360kg/m3 cement, 805kg/m3 sand, 1045kg/m3 stone, slump controlled at 210 +/-10 mm, mixing 0.20% cement mass (converted into solid) of the defoaming polycarboxylic acid water reducing agent prepared in the additive examples 1-3, the product prepared in the comparative example 1, the commercial common water reducing agent prepared in the comparative example 2 and the water reducing agent and defoaming agent in the comparative example 3, respectively, and testing the water reducing rate, slump, air content and strength of the prepared concrete according to GB 8076 + 2008 concrete additive, wherein the obtained results are shown in Table 2. Wherein the time period from the preparation to the use of the products prepared in examples 1-3 and comparative example 1 was 12 hours.
TABLE 1 surface tension test
| Name (R) | Surface tension value |
| Example 1 | 35 |
| Example 2 | 31 |
| Example 3 | 29 |
| Comparative example 1 | 42 |
| Comparative example 2 | 48 |
| Comparative example 3 | 40 |
TABLE 2 comparison of Properties
As can be seen from tables 1-2, compared with comparative example 1, examples 1-3 of the invention can effectively reduce the surface tension of the solution, improve the compressive strength of concrete 7d and 28d, and have the technical effects of high water reducing rate and good defoaming effect; examples 1 to 3 of the present invention, which allow the gas content of concrete to be smaller, had a defoaming effect while maintaining high water-reducing ability, as compared with comparative example 2; compared with the comparative example 3, the examples 1 to 3 of the invention have the technical effects of strong stability and better defoaming effect; in conclusion, the defoaming type polycarboxylate superplasticizer provided by the invention has remarkable defoaming and foam inhibiting effects while maintaining high water reducing performance, and is strong in stability.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A defoaming type polycarboxylate superplasticizer is characterized in that: prepared by copolymerizing unsaturated polyoxyethylene ether monomer, defoaming functional material and unsaturated carboxylic acid;
the defoaming functional material is prepared by carrying out hydrosilylation reaction on alkynol and hydrogen-containing silicone oil; the ratio of the unsaturated polyoxyethylene ether monomer, the defoaming functional material and the unsaturated carboxylic acid is as follows in parts by weight: 300-400: 5-20: 30-60.
2. The defoaming type polycarboxylate water reducer according to claim 1, characterized in that the ratio of the alkynol to the hydrogen-containing silicone oil is 50-100: 250 to 350.
3. The defoaming polycarboxylic acid water reducing agent according to claim 1, characterized in that the alkynol is one or more of 10-undecenol, 3, 5-dimethyl-1-hexyn-3-ol, 3-methyl-1-pentyn-3-ol, 1-hexyn-3-ol, 2-propyn-1-ol, 2-dimethylacetylene methanol, 6-heptynol and 7-octyn-1-ol.
4. The defoaming type polycarboxylate water reducer according to claim 1, characterized in that the hydrogen-containing silicone oil is one or a mixture of methyl hydrogen-containing silicone oil and ethyl hydrogen-containing silicone oil.
5. The defoaming polycarboxylic acid water reducing agent according to claim 1, characterized in that the hydrosilylation reaction temperature is 90-120 ℃.
6. The defoaming type polycarboxylate water reducer according to claim 1, characterized in that the unsaturated polyoxyethylene ether monomer is one or more of allyl polyoxyethylene ether, methyl allyl polyoxyethylene ether and isoamyl alcohol polyoxyethylene ether, and the molecular weight of the unsaturated polyoxyethylene ether monomer is 600-3000.
7. The defoaming type polycarboxylate water reducer according to claim 1, characterized in that the unsaturated carboxylic acid is at least one of acrylic acid, methacrylic acid and crotonic acid.
8. The defoaming polycarboxylic acid water reducing agent according to claim 1, characterized in that the copolymerization reaction temperature is 40-65 ℃.
9. The preparation method of the defoaming polycarboxylic acid water reducer according to any one of claims 1 to 8, characterized by comprising the following preparation steps:
s100, mixing the defoaming functional material, the unsaturated polyoxyethylene ether monomer and water to obtain a solution A;
s200, adding an unsaturated carboxylic acid aqueous solution into the solution A to perform copolymerization reaction to obtain a defoaming polycarboxylic acid water reducing agent;
the preparation method of the defoaming functional material comprises the following steps: mixing alkynol and hydrogen-containing silicone oil, and carrying out hydrosilylation reaction to obtain the defoaming functional material.
10. The preparation method of the defoaming type polycarboxylate water reducer according to claim 9, characterized in that in S100, a defoaming type functional material, an unsaturated polyoxyethylene ether monomer and water are mixed and heated to obtain a solution A.
11. The preparation method of the defoaming polycarboxylic acid water reducing agent according to claim 9, characterized in that a reducing agent and a chain transfer agent are further added to S200;
the reducing agent is at least one of ascorbic acid, sodium hypophosphite, sodium formaldehyde sulfoxylate or sodium bisulfite; the chain transfer agent is at least one of thioglycolic acid, mercaptopropionic acid and mercaptoethanol.
12. The preparation method of the defoaming polycarboxylic acid water reducing agent according to claim 9, characterized in that a Speier catalyst is further added in the hydrosilation reaction; the ratio of the alkynol, the hydrogen-containing silicone oil and the Speier catalyst is 50-100: 250-350: 0.015 to 0.02.
13. The preparation method of the defoaming polycarboxylic acid water reducing agent according to claim 9, characterized in that a polymerization inhibitor is further added in the hydrosilation reaction; the polymerization inhibitor is at least one of 4-tert-butyl catechol, hydroquinone, 2, 5-di-tert-butyl hydroquinone, methyl hydroquinone and p-benzoquinone.
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