CN111423145A - Green and environment-friendly mortar water reducing agent - Google Patents
Green and environment-friendly mortar water reducing agent Download PDFInfo
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- CN111423145A CN111423145A CN202010308414.6A CN202010308414A CN111423145A CN 111423145 A CN111423145 A CN 111423145A CN 202010308414 A CN202010308414 A CN 202010308414A CN 111423145 A CN111423145 A CN 111423145A
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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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)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a green and environment-friendly mortar water reducing agent which is mainly prepared from the following raw materials in parts by weight: monomer A component: 30-45 parts of a solvent; polyoxyethylene allyl ester: 40-60 parts; sodium lignin sulfate: 15-20 parts of a solvent; a retarding component: 0.5-2 parts; chain transfer agent: 2-5 parts; initiator: 0.5-1.2 parts; soluble alkali: 5-7 parts; sulfonating agent: 10-15 parts; solvent: 30-40 parts of a binder; the monomer A component comprises maleic anhydride and styrene, wherein the mass ratio of the maleic anhydride to the styrene is 1: 0.5-1: 1.2. The water reducing agent prepared from the raw materials improves the working performance of the water reducing agent in the application of high-strength concrete, and the adopted raw materials are environment-friendly and nontoxic, wherein the sodium lignin sulfate belongs to renewable energy sources, and the water reducing agent has the effects of environmental friendliness and resource saving.
Description
Technical Field
The invention relates to the field of water reducing agents, in particular to a green and environment-friendly mortar water reducing agent.
Background
The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump of concrete basically unchanged, has a dispersing effect on cement particles after being added with a concrete mortar mixture, disintegrates a flocculation structure of the cement particles wrapped with part of water, and allows released water to participate in flowing, so that the fluidity of the concrete mortar mixture can be effectively increased, and the unit water consumption is reduced. The water reducing agent mainly comprises a common water reducing agent, a naphthalene sulfonate water reducing agent, a polycarboxylic acid high-performance water reducing agent and the like in China, wherein the polycarboxylic acid water reducing agent is a concrete mortar water reducing agent with the optimal comprehensive performance at present, and compared with other types of water reducing agents, the polycarboxylic acid water reducing agent has the advantages of low mixing amount, high water reducing rate, obvious reinforcing effect and the like.
Currently, for example, chinese patent application publication No. CN109337026A discloses a method for preparing a polycarboxylic acid water reducing agent for mortar, comprising the following steps: s1, preparing raw materials, wherein the raw materials comprise polyethylene glycol monomethyl ether, acrylic acid, methyl benzene sulfonic acid, hydroquinone, phenothiazine, an initiator, 30% sodium hydroxide solution, lauryl mercaptan, mercaptopropionic acid and soft water; s2, preparing a macromonomer; s3, soft water addition and heating: s4, polymerization; s5, synthesis. The polycarboxylate water reducer for the mortar prepared by the invention increases the water reducing rate of the mortar, and greatly improves the fluidity of the mortar under the condition of the same water adding amount of the mortar; the prepared polycarboxylic acid water reducing agent for the mortar improves the early strength of the mortar; the powdery polycarboxylate superplasticizer is added into the thermal insulation bonding mortar, so that the tensile bonding performance of the thermal insulation bonding mortar and the polystyrene board can be improved.
When the polycarboxylate water reducing agent in the prior art is applied to the preparation of high-strength concrete mortar, the problems of poor concrete fluidity and the phenomena of bleeding and the like are easily caused due to the strong selectivity of the air entraining agent and the defoaming agent and the influence of more sediment content in concrete.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a green and environment-friendly mortar water reducing agent, which can expand the application range of the mortar water reducing agent, improve the fluidity of concrete and avoid the occurrence of bleeding when high-strength concrete mortar is prepared.
The second purpose of the invention is to provide a preparation method of the green and environment-friendly mortar water reducing agent, which can obtain the mortar water reducing agent with higher application performance in high-strength concrete.
In order to achieve the first object, the invention provides the following technical scheme:
a green environment-friendly mortar water reducing agent is mainly prepared from the following raw materials in parts by weight:
monomer A component: 30-45 parts of a solvent;
polyoxyethylene allyl ester: 40-60 parts;
sodium lignin sulfate: 15-20 parts of a solvent;
a retarding component: 0.5-2 parts;
chain transfer agent: 2-5 parts;
initiator: 0.5-1.2 parts;
soluble alkali: 5-7 parts;
sulfonating agent: 10-15 parts;
solvent: 30-40 parts of a binder;
the monomer A component comprises maleic anhydride and styrene, wherein the mass ratio of the maleic anhydride to the styrene is 1: 0.5-1: 1.2.
By adopting the technical scheme, the styrene-maleic anhydride copolymer is formed by mutually polymerizing the two monomers of styrene and maleic anhydride, so that a part of polycarboxylic acid main chain can be replaced, the performance of the water reducing agent can be improved due to the amphiphilic property of the copolymer, and in addition, compared with the synthesis of a conventional polycarboxylic acid macromonomer, the synthesis efficiency of the styrene-maleic anhydride copolymer is higher, so that the production cost can be reduced; because the carbon-carbon double bond of the sodium lignosulfate and the carbon-carbon double bond of the polyoxyethylene allyl ester are subjected to polymerization reaction, the formed composition and the styrene-maleic anhydride copolymer mutually form the compound water reducing agent, so that the water reducing agent has better fluidity and water reducing property, reduces the bleeding problem, and improves the working performance of the water reducing agent in the application of high-strength concrete. The water reducer adopts environment-friendly and nontoxic raw materials, wherein the lignosulfate belongs to renewable energy, can be used for recycling industrial wastewater of paper making industry or can be obtained from nature, can replace part of polycarboxylic acid macromonomer, and has the effects of environmental protection and resource saving.
Further, the mass ratio of maleic anhydride and styrene was 1: 0.6.
By adopting the technical scheme, the two monomers of maleic anhydride and styrene are subjected to polymerization reaction with each other to generate the styrene-maleic anhydride copolymer, so that a part of polycarboxylic acid main chain is replaced, and when the mass ratio of the maleic anhydride to the styrene is 1: when the water reducing agent content is 0.6, the content of free monomers in the system is the lowest, and the water reducing rate, the fluidity and the slump retaining property of the water reducing agent are all improved.
Further, the initiator is prepared by uniformly mixing tert-butyl hydroperoxide and sodium metabisulfite according to the mass ratio of 1: 1-1: 2.4.
By adopting the technical scheme, the initiator is prepared by utilizing tert-butyl hydroperoxide and sodium metabisulfite according to a certain mass ratio, and the system of the initiator can reduce the reaction temperature of monomer polymerization in the system, save energy, improve the conversion efficiency and reduce the occurrence of side reactions.
Further, the initiator is prepared by using tert-butyl hydroperoxide and sodium metabisulfite in a mass ratio of 1:2.
By adopting the technical scheme, the initiator prepared from the tert-butyl hydroperoxide and the sodium metabisulfite according to the quantity proportion of the substances has higher conversion rate for promoting the monomer in the water reducing agent system to carry out polymerization reaction, thereby improving the water reducing rate of the water reducing agent.
Further, the chain transfer agent is one or more of thioglycolic acid, trichloroethylene and isododecyl mercaptan.
By adopting the technical scheme, the polymerization degree of the polymer is controlled by using the chain transfer agent, in the polymerization reaction of the free monomer, the chain free radical takes the more active atom in the chain transfer to terminate, and generates a new free radical to continuously initiate the polymerization of the monomer, so that the length of the chain can be effectively controlled.
Further, the retarding component is sodium gluconate.
By adopting the technical scheme, the hydroxyl in the sodium gluconate molecules forms a solvated water film on the surfaces of cement particles, and contact points among the cement particles are reduced, so that water molecules wrapped in cement particle groups are dispersed in a system and participate in flowing, thereby effectively inhibiting the hydration speed of cement, prolonging the setting time, reducing slump loss and obviously improving the performance of the water reducer.
Further, the soluble base is sodium hydroxide.
By adopting the technical scheme, after the polycarboxylic acid polymerization reaction is finished, the water reducing agent is acidic due to the acidic components in the system, the pH value of the water reducing agent system is neutralized by using sodium hydroxide, the water reducing agent system is biased to be neutral as a whole, and the stability of each component in the system during storage and application can be improved.
Further, the sulfonating agent is oleum.
By adopting the technical scheme, fuming sulfuric acid and styrene are subjected to sulfonation reaction to generate styrene sulfonic acid, so that a sulfonic group is introduced, the water solubility and the biological activity of a product can be enhanced, and then styrene sulfonic acid and maleic anhydride are subjected to copolymerization reaction to generate a sulfonated styrene-maleic anhydride copolymer which can replace a part of a polycarboxylic acid main chain, so that the overall performance of the water reducing agent is improved.
Further, the solvent is xylene.
By adopting the technical scheme, the molecular groups of the dimethylbenzene can attract the molecular groups in the solvent raw material, so that the uniform dissolution of the mixture is promoted, and the polymerization reaction rate of the system is improved.
In order to achieve the second object, the invention provides the following technical scheme:
a green environment-friendly mortar water reducing agent comprises the following steps:
s1, adding a certain amount of styrene and a sulfonating agent into a reactor, controlling the temperature of the system to be 20-30 ℃, preserving the temperature for 2-4 h for reaction, and cooling to room temperature after the reaction is finished to obtain a first mixed solution;
s2, adding polyoxyethylene allyl ester, sodium lignin sulfate, a retarding component and a solvent into a reaction container, uniformly stirring with the first mixed solution, controlling the system temperature to be 30-50 ℃, dropwise adding maleic anhydride within 1.5h, dropwise adding an initiator and a chain transfer agent into the reaction container within 1h, preserving heat, stirring for reacting for 2-4 h, and discharging to obtain a second mixed solution;
and S3, dropwise adding soluble alkali into the second mixed solution, uniformly stirring, and adjusting the pH value to 6.5-7 to obtain a finished product of the mortar water reducer.
By adopting the technical scheme, the sulfonating agent and styrene are firstly sulfonated, and the produced product is then copolymerized with maleic anhydride at a specified temperature to generate a sulfonic acid styrene-maleic anhydride copolymer which has amphipathy and can replace part of a polycarboxylic acid main chain; meanwhile, the lignosulfonic acid and the polyoxyethylene allyl ester are copolymerized at a specified temperature, and the generated product and styrene-maleic anhydride are copolymerized to be compounded into the water reducing agent, so that the performance of the water reducing agent on high-strength concrete can be improved.
In conclusion, the invention has the following beneficial effects:
firstly, because two monomers of styrene and maleic anhydride are polymerized with each other to form a styrene-maleic anhydride copolymer, a part of polycarboxylic acid main chain can be replaced, and because the copolymer has the amphiphilic property, the performance of the water reducing agent can be improved, and in addition, compared with the synthesis of a conventional polycarboxylic acid macromonomer, the synthesis efficiency of the styrene-maleic anhydride copolymer is higher, and the production cost can be reduced; because the carbon-carbon double bond of the sodium lignosulfate and the carbon-carbon double bond of the polyoxyethylene allyl ester are subjected to polymerization reaction, the formed composition and the styrene-maleic anhydride copolymer form a compound water reducing agent, the working performance of the water reducing agent in the application of high-strength concrete is improved, the water reducing agent has better fluidity and water reducing performance, and the bleeding problem is reduced.
Secondly, the two monomers of maleic anhydride and styrene are mutually polymerized to generate a styrene-maleic anhydride copolymer so as to replace part of the polycarboxylic acid main chain, and when the mass ratio of the maleic anhydride to the styrene is 1: when the water reducing agent content is 0.6, the content of free monomers in the system is the lowest, and the water reducing rate, the fluidity and the slump retaining property of the water reducing agent are improved.
And thirdly, the initiator is prepared by using tert-butyl hydroperoxide and sodium metabisulfite according to a certain substance amount ratio, and the system of the initiator can reduce the polymerization reaction temperature of monomers in the system, save energy, improve the conversion efficiency and reduce the occurrence of side reactions.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples:
the maleic anhydride is prepared from 108-31-6 of Jiangsu Jiaren chemical Co.
The styrene is produced by Jinan Kai Jun chemical industry Co.
The sodium lignin sulfate was a sodium lignin sulfate having a product number of 28, which was manufactured by Stachy refractory Co., Ltd.
The fuming sulfuric acid is 50% of fuming sulfuric acid produced by Keyunlong chemical Co.
Examples
Example 1
The green and environment-friendly mortar water reducing agent is mainly prepared from the following raw materials in parts by weight:
monomer A component: 30 kg;
polyoxyethylene allyl ester: 40 kg;
sodium lignin sulfate: 16 kg;
sodium gluconate: 1 kg;
thioglycolic acid: 3 kg;
initiator: 0.5 kg;
sodium hydroxide: 5 kg;
fuming sulfuric acid: 15 kg;
xylene: 35 kg;
wherein the monomer A component comprises maleic anhydride and styrene with the mass ratio of 1:1, and the initiator is formed by uniformly mixing tert-butyl hydroperoxide and sodium metabisulfite according to the mass ratio of 1:1.
The green and environment-friendly mortar water reducing agent of the embodiment is prepared by the following method:
s1, adding styrene and fuming sulfuric acid into the reactor, controlling the temperature of the system to be 20 ℃, preserving the temperature for 2 hours for reaction, and cooling to room temperature after the reaction is finished to obtain a first mixed solution;
s2, adding polyoxyethylene allyl ester, sodium lignin sulfate, sodium gluconate and xylene into a reaction container, uniformly stirring with the first mixed solution, controlling the temperature of the system to be 50 ℃, dropwise adding maleic anhydride within 1.5h, preparing tert-butyl hydroperoxide and sodium metabisulfite into an initiator mixed solution, dropwise adding the initiator mixed solution and thioglycolic acid into the reaction container within 1h, preserving heat, stirring for reacting for 2h, and discharging to obtain a second mixed solution;
and S3, dropwise adding sodium hydroxide into the second mixed solution, uniformly stirring, and adjusting the pH value to 6.5 to obtain a finished product of the mortar water reducer.
Example 2
The green and environment-friendly mortar water reducing agent is mainly prepared from the following raw materials in parts by weight:
monomer A component: 35 kg;
polyoxyethylene allyl ester: 55 kg;
sodium lignin sulfate: 18 kg;
sodium gluconate: 0.5 kg;
thioglycolic acid: 3 kg;
initiator: 1 kg;
sodium hydroxide: 7 kg;
fuming sulfuric acid: 13 kg;
xylene: 30 kg;
wherein the monomer A component comprises maleic anhydride and styrene with the mass ratio of 1:1, and the initiator is formed by uniformly mixing tert-butyl hydroperoxide and sodium metabisulfite according to the mass ratio of 1:1.
The green and environment-friendly mortar water reducing agent of the embodiment is prepared by the following method:
s1, adding styrene and fuming sulfuric acid into the reactor, controlling the temperature of the system to be 25 ℃, preserving the temperature for 4 hours for reaction, and cooling to room temperature after the reaction is finished to obtain a first mixed solution;
s2, adding polyoxyethylene allyl ester, sodium lignin sulfate, sodium gluconate and xylene into a reaction container, uniformly stirring with the first mixed solution, controlling the temperature of the system to be 45 ℃, dropwise adding maleic anhydride within 1.5h, preparing tert-butyl hydroperoxide and sodium metabisulfite into an initiator mixed solution, dropwise adding the initiator mixed solution and thioglycolic acid into the reaction container within 1h, preserving heat, stirring for reacting for 3h, and discharging to obtain a second mixed solution;
and S3, dropwise adding sodium hydroxide into the second mixed solution, uniformly stirring, and adjusting the pH value to 7 to obtain a finished product of the mortar water reducer.
Example 3
The green and environment-friendly mortar water reducing agent is mainly prepared from the following raw materials in parts by weight:
monomer A component: 30 kg;
polyoxyethylene allyl ester: 60 kg;
sodium lignin sulfate: 20 kg;
sodium gluconate: 1.5 kg;
thioglycolic acid: 5 kg;
initiator: 0.8 kg;
sodium hydroxide: 6 kg;
fuming sulfuric acid: 15 kg;
xylene: 35 kg;
wherein the monomer A component comprises maleic anhydride and styrene with the mass ratio of 1:1, and the initiator is formed by uniformly mixing tert-butyl hydroperoxide and sodium metabisulfite according to the mass ratio of 1:1.
The green and environment-friendly mortar water reducing agent of the embodiment is prepared by the following method:
s1, adding styrene and fuming sulfuric acid into the reactor, controlling the temperature of the system to be 30 ℃, preserving the temperature for 3 hours for reaction, and cooling to room temperature after the reaction is finished to obtain a first mixed solution;
s2, adding polyoxyethylene allyl ester, sodium lignin sulfate, sodium gluconate and xylene into a reaction container, uniformly stirring with the first mixed solution, controlling the temperature of the system to be 30 ℃, dropwise adding maleic anhydride within 1.5h, preparing tert-butyl hydroperoxide and sodium metabisulfite into an initiator mixed solution, dropwise adding the initiator mixed solution and thioglycolic acid into the reaction container within 1h, preserving heat, stirring for reacting for 2.5h, and discharging to obtain a second mixed solution;
and S3, dropwise adding sodium hydroxide into the second mixed solution, uniformly stirring, and adjusting the pH value to 7 to obtain a finished product of the mortar water reducer.
Example 4
The green and environment-friendly mortar water reducing agent is mainly prepared from the following raw materials in parts by weight:
monomer A component: 45 kg;
polyoxyethylene allyl ester: 45 kg;
sodium lignin sulfate: 15 kg;
sodium gluconate: 2 kg;
thioglycolic acid: 2 kg;
initiator: 1.2 kg;
sodium hydroxide: 5 kg;
fuming sulfuric acid: 10 kg;
xylene: 40 kg;
wherein the monomer A component comprises maleic anhydride and styrene with the mass ratio of 1:1, and the initiator is formed by uniformly mixing tert-butyl hydroperoxide and sodium metabisulfite according to the mass ratio of 1:1.
The green and environment-friendly mortar water reducing agent of the embodiment is prepared by the following method:
s1, adding styrene and fuming sulfuric acid into the reactor, controlling the temperature of the system to be 25 ℃, preserving the temperature for 2 hours for reaction, and cooling to room temperature after the reaction is finished to obtain a first mixed solution;
s2, adding polyoxyethylene allyl ester, sodium lignin sulfate, sodium gluconate and xylene into a reaction container, uniformly stirring with the first mixed solution, controlling the temperature of the system to be 45 ℃, dropwise adding maleic anhydride within 1.5h, preparing tert-butyl hydroperoxide and sodium metabisulfite into an initiator mixed solution, dropwise adding the initiator mixed solution and thioglycolic acid into the reaction container within 1h, preserving heat, stirring for reacting for 4h, and discharging to obtain a second mixed solution;
and S3, dropwise adding sodium hydroxide into the second mixed solution, uniformly stirring, and adjusting the pH value to 6.5 to obtain a finished product of the mortar water reducer.
Example 5
The green and environment-friendly mortar water reducing agent is mainly prepared from the following raw materials in parts by weight:
monomer A component: 40 kg;
polyoxyethylene allyl ester: 55 kg;
sodium lignin sulfate: 18 kg;
sodium gluconate: 1 kg;
thioglycolic acid: 4 kg;
initiator: 0.6 kg;
sodium hydroxide: 7 kg;
fuming sulfuric acid: 12 kg;
xylene: 30 kg;
wherein the monomer A component comprises maleic anhydride and styrene with the mass ratio of 1:1, and the initiator is formed by uniformly mixing tert-butyl hydroperoxide and sodium metabisulfite according to the mass ratio of 1:1.
The green and environment-friendly mortar water reducing agent of the embodiment is prepared by the following method:
s1, adding styrene and fuming sulfuric acid into the reactor, controlling the temperature of the system to be 20 ℃, preserving the temperature for 3 hours for reaction, and cooling to room temperature after the reaction is finished to obtain a first mixed solution;
s2, adding polyoxyethylene allyl ester, sodium lignin sulfate, sodium gluconate and xylene into a reaction container, uniformly stirring with the first mixed solution, controlling the temperature of the system to be 40 ℃, dropwise adding maleic anhydride within 1.5h, preparing tert-butyl hydroperoxide and sodium metabisulfite into an initiator mixed solution, dropwise adding the initiator mixed solution and thioglycolic acid into the reaction container within 1h, preserving heat, stirring for reacting for 3h, and discharging to obtain a second mixed solution;
and S3, dropwise adding sodium hydroxide into the second mixed solution, uniformly stirring, and adjusting the pH value to 7 to obtain a finished product of the mortar water reducer.
Example 6
The difference from example 2 is that: the mass ratio of maleic anhydride to styrene was 1: 0.5.
Example 7
The difference from example 2 is that: the mass ratio of maleic anhydride to styrene was 1: 0.6.
Example 8
The difference from example 2 is that: the mass ratio of maleic anhydride to styrene was 1: 1.2.
Example 9
The difference from example 7 is that: the mass ratio of tert-butyl hydroperoxide to sodium metabisulfite was 1:2.
Example 10
The difference from example 7 is that: the mass ratio of tert-butyl hydroperoxide to sodium metabisulfite was 2.4.
Example 11
The difference from example 7 is that: the mass ratio of tert-butyl hydroperoxide to sodium metabisulfite was 1: 1.6.
Example 12
The difference from example 9 is that: the chain transfer agent is trichloroethylene.
Example 13
The difference from example 9 is that: the chain transfer agent is isododecyl mercaptan.
Comparative example
Comparative example 1
The difference from example 2 is that: the monomer component A and the sulfonating agent are not added in the formula.
Comparative example 2
The difference from example 2 is that: sodium lignin sulfate is not added in the formula.
Comparative example 3
The difference from example 2 is that: sodium lignin sulfate, single component A and sulfonating agent are not added in the formula.
Comparative example 4
The difference from example 2 is that: the initiator is dicumyl peroxide.
Comparative example 5
The difference from example 2 is that: the initiator is azobisisobutyronitrile.
Comparative example 6
The difference from example 2 is that: the initiator is benzoyl.
Performance test
Testing according to the related standard of cement mortar fluidity in GB/T8077-2012 concrete admixture homogeneity test method, and detecting initial mortar fluidity (mm) and 1h mortar fluidity (mm); detecting the water reducing rate and the bleeding rate of the water reducing agent in the mortar according to a determination method for determining the 6.5.2 water reducing rate in GB/T8076-2008 'concrete admixture' and a determination of 6.5.3 bleeding rate ratio; the initial slump (mm)/the slump (mm) and the 1h slump (mm)/the slump (mm) of the concrete are detected according to a slump and slump expansion method 3.1 in GB/T50080-2002 Standard of Performance test methods of common concrete mixtures.
The test takes C50 concrete mortar as an object, the cement adopts ordinary portland cement, the sand material adopts river sand with fineness modulus of 2.6, the stones are continuous graded broken stones with the thickness of 5-25mm, and the mixing amount of the water reducing agent is 0.6%. The water reducing agents prepared in the above examples and comparative examples were applied to C50 concrete mortar, and commercially available polycarboxylic acid water reducing agents were used as a blank group, and a polycarboxylic acid water reducing agent produced by cunan cheno new building materials ltd was used as a blank group.
TABLE 1-C50 concrete mortar compositions
| Cement | Fly ash | Sand | Stone (stone) | Water (W) |
| 250 kg/m3 | 70 kg/m3 | 800 kg/m3 | 1050 kg/m3 | 180 kg/m3 |
TABLE 2-C50 test results for concrete mortar Properties
From the test results of table 2, it can be seen that:
according to the comparison of the test data of the example 2 and the comparative examples 1 to 3, the addition of styrene and maleic anhydride into the water reducing agent system can improve the water reducing rate, the fluidity and the slump retention, the styrene is sulfonated to form styrene sulfonic acid, and then the styrene sulfonic acid and the maleic anhydride are polymerized to form a styrene-maleic anhydride copolymer which can be used as a main chain of the polycarboxylic acid to replace a part of polycarboxylic acid macromonomer, has certain hydrophilic and lipophilic properties, can present good dispersion and emulsification performance, and thus improve the water reducing rate and the slump retention of the water reducing agent. The sodium lignin sulfate can improve the water solubility and the surface activity of the water reducer, and the combined monomer polymer and the styrene-maleic anhydride form a compound water reducer by utilizing the copolymerization reaction of carbon-carbon double bonds in sodium lignin sulfate molecules and carbon-carbon double bonds of polyoxyethylene allyl ester, so that the effects of improving the water reducer and the fluidity can be achieved, and the working performance of the water reducer in the preparation of high-strength concrete can be improved.
According to the test data of the examples 7, 9-11 and the comparative examples 4-6, the water reducing agent obtained by using the initiator mixed by the tert-butyl hydroperoxide and the sodium metabisulfite has better performance, the initiator can reduce the temperature of the monomer polymerization reaction and improve the conversion efficiency, and the water reducing rate, the fluidity and the slump retaining property of the water reducing agent produced by the initiator system are obviously improved.
According to the comparison of the test data of the examples 2 and 5 to 8, the styrene and the maleic anhydride and the content ratio thereof have certain influence on the fluidity, the water reducing rate and the slump retaining property of the water reducing agent, and when the mass ratio of the maleic anhydride to the styrene is 1: when 0.6, the content of free monomers in the system is low, and the water reducing rate, the fluidity and the slump retaining property of the water reducing agent reach the best values; along with the reduction of the ratio, the content of the styrene is increased, and the content of free monomers in the system is gradually increased, so that the water reducing performance of the water reducing agent is reduced. Meanwhile, the initiator is utilized to promote the polymerization reaction of the system, the conversion rate is improved, and the free monomer in the system can be further reduced.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The green and environment-friendly mortar water reducing agent is characterized by being mainly prepared from the following raw materials in parts by weight:
monomer A component: 30-45 parts of a solvent;
polyoxyethylene allyl ester: 40-60 parts;
sodium lignin sulfate: 15-20 parts of a solvent;
a retarding component: 0.5-2 parts;
chain transfer agent: 2-5 parts;
initiator: 0.5-1.2 parts;
soluble alkali: 5-7 parts;
sulfonating agent: 10-15 parts;
solvent: 30-40 parts of a binder;
wherein the monomer A component comprises maleic anhydride and styrene in a mass ratio of (1: 0.5) to (1: 1.2).
2. The green and environment-friendly mortar water reducer according to claim 1, wherein the mass ratio of maleic anhydride to styrene is 1: 0.6.
3. The green and environment-friendly mortar water reducer according to claim 1, wherein the initiator is prepared by uniformly mixing tert-butyl hydroperoxide and sodium metabisulfite according to the mass ratio of (1: 1) - (1: 2.4).
4. The green and environment-friendly mortar water reducer according to claim 3, wherein the initiator is a mixture of tert-butyl hydroperoxide and sodium metabisulfite in a ratio of 1:2.
5. The green and environment-friendly mortar water reducer according to claim 1, wherein the chain transfer agent is one or a mixture of thioglycolic acid, trichloroethylene and isododecyl mercaptan.
6. The green and environment-friendly mortar water reducer according to claim 1, characterized in that the set retarding component is sodium gluconate.
7. The green and environment-friendly mortar water reducer according to claim 1, characterized in that the soluble alkali is sodium hydroxide.
8. The green and environment-friendly mortar water reducer according to claim 1, characterized in that the sulfonating agent is fuming sulfuric acid.
9. The green and environment-friendly mortar water reducer according to claim 1, characterized in that the solvent is xylene.
10. A preparation method of a green and environment-friendly mortar water reducer is based on any one of the claims, and is characterized by comprising the following steps:
s1, adding a certain amount of styrene and a sulfonating agent into a reactor, controlling the temperature of the system to be 20-30 ℃, preserving the temperature for 2-4 h for reaction, and cooling to room temperature after the reaction is finished to obtain a first mixed solution;
s2, adding polyoxyethylene allyl ester, sodium lignin sulfate, a retarding component and a solvent into a reaction container, uniformly stirring with the first mixed solution, controlling the system temperature to be 30-50 ℃, dropwise adding maleic anhydride within 1.5h, dropwise adding an initiator and a chain transfer agent into the reaction container within 1h, preserving heat, stirring for reacting for 2-4 h, and discharging to obtain a second mixed solution;
and S3, dropwise adding soluble alkali into the second mixed solution, uniformly stirring, and adjusting the pH value to 6.5-7 to obtain a finished product of the mortar water reducer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114133163A (en) * | 2021-11-23 | 2022-03-04 | 东莞市金胜混凝土有限公司 | Concrete additive and preparation method thereof |
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| CN1712381A (en) * | 2004-06-21 | 2005-12-28 | 中国科学院广州化学研究所 | Polyether graft poly-carboxylic acid concrete water reducer preparation |
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| CN1712381A (en) * | 2004-06-21 | 2005-12-28 | 中国科学院广州化学研究所 | Polyether graft poly-carboxylic acid concrete water reducer preparation |
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