CN115974451B - Efficient environment-friendly water reducer and preparation method thereof - Google Patents
Efficient environment-friendly water reducer and preparation method thereof Download PDFInfo
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- CN115974451B CN115974451B CN202310045234.7A CN202310045234A CN115974451B CN 115974451 B CN115974451 B CN 115974451B CN 202310045234 A CN202310045234 A CN 202310045234A CN 115974451 B CN115974451 B CN 115974451B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 42
- 229920002472 Starch Polymers 0.000 claims abstract description 28
- 235000019698 starch Nutrition 0.000 claims abstract description 28
- 239000008107 starch Substances 0.000 claims abstract description 28
- 239000003999 initiator Substances 0.000 claims abstract description 13
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims abstract description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 9
- 239000011575 calcium Substances 0.000 claims abstract description 9
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 9
- 125000005394 methallyl group Chemical group 0.000 claims abstract description 9
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 9
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 9
- DFQUBYCHLQAFOW-IHWYPQMZSA-N (z)-4-(methylamino)-4-oxobut-2-enoic acid Chemical compound CNC(=O)\C=C/C(O)=O DFQUBYCHLQAFOW-IHWYPQMZSA-N 0.000 claims abstract description 8
- ZAJAQTYSTDTMCU-UHFFFAOYSA-N 3-aminobenzenesulfonic acid Chemical compound NC1=CC=CC(S(O)(=O)=O)=C1 ZAJAQTYSTDTMCU-UHFFFAOYSA-N 0.000 claims abstract description 8
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 6
- 235000013399 edible fruits Nutrition 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims description 22
- 229910021389 graphene Inorganic materials 0.000 claims description 21
- 241000196324 Embryophyta Species 0.000 claims description 19
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- -1 graphene compound Chemical class 0.000 claims description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- 229920000742 Cotton Polymers 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- KEQGZUUPPQEDPF-UHFFFAOYSA-N 1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione Chemical compound CC1(C)N(Cl)C(=O)N(Cl)C1=O KEQGZUUPPQEDPF-UHFFFAOYSA-N 0.000 claims description 5
- 235000004443 Ricinus communis Nutrition 0.000 claims description 5
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- XTHPWXDJESJLNJ-UHFFFAOYSA-N chlorosulfonic acid Substances OS(Cl)(=O)=O XTHPWXDJESJLNJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000011487 hemp Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 229920002545 silicone oil Polymers 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- 244000025254 Cannabis sativa Species 0.000 claims description 4
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims description 4
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 4
- 235000009120 camo Nutrition 0.000 claims description 4
- 235000005607 chanvre indien Nutrition 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000001603 reducing effect Effects 0.000 abstract description 8
- 230000035699 permeability Effects 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 14
- 239000004568 cement Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000013530 defoamer Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 2
- 235000013539 calcium stearate Nutrition 0.000 description 2
- 239000008116 calcium stearate Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a high-efficiency environment-friendly water reducer and a preparation method thereof, belonging to the technical field of water reducers, wherein the water reducer comprises: modified plant fiber: 20-50 parts; modified sulfonated starch: 10-20 parts; sodium methallyl sulfonate: 1-20 parts; n-methyl maleic acid monoamide: 1-10 parts; aminobenzenesulfonic acid: 1-10 parts; 1-vinyl-2-pyrrolidone: 1-10 parts; methallyl polyoxyethylene ether: 30-50 parts; and (3) an initiator: 1-5 parts; defoaming agent: 1-5 parts; according to the invention, the cotton-flax fiber has certain hydrophilicity, air permeability and adsorptivity by preparing the modified plant fiber, and the calcium fruit acid is adhered and grafted on the surface of the cotton-flax fiber to form a calcium film layer, so that the oxidation resistance of the cotton-flax fiber is further improved, and meanwhile, the toughness and the mechanical property are improved; modified sulfonated starch is prepared, so that a molecular chain is shortened, the viscosity is lowered, and the water reducing effect is better in fluidity.
Description
Technical Field
The invention belongs to the technical field of water reducers, and particularly relates to a high-efficiency environment-friendly water reducer and a preparation method thereof.
Background
The water reducing agent is an additive of concrete, can improve the workability of the concrete, reduce construction energy consumption, improve construction efficiency, add the water reducing agent in the concrete mixture, have dispersing effect to the fine particle of cement, optimize the working property of cement, under the condition that the slump of the concrete is unchanged, can greatly reduce the unit water consumption of the concrete mixture by adding the water reducing agent, reduce the water-cement ratio of the concrete, strengthen the strength and stability of the concrete; or under the condition that the workability and strength of the concrete are unchanged, the dosage of unit cement can be reduced by adding the water reducer, and the cement is saved.
Along with the rapid development of high-performance concrete and pumping concrete, the usage amount of the high-efficiency water reducer is also larger and larger, so that the development of the high-efficiency environment-friendly water reducer and the preparation method thereof has important significance, and the existing water reducer and the preparation method thereof have the following defects:
the domestic water reducer is used later, and has a small gap compared with the European and American developed countries; the water reducer used at present has the problems of high energy consumption and high pollution, and has higher production cost, so that the preparation requirement of the water reducer is greatly limited; the water reducer prepared by the prior art can lower the fluidity retention rate of the concrete, thereby reducing the utilization rate of the concrete; the research on modifying the water reducer by using different biological bases has little domestic attention, and a research system needs to be perfected; the water reducer prepared at present has the problems of poor durability, poor impermeability and limited water reducing effect, and has the advantages of complex preparation method and low market value.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the high-efficiency environment-friendly water reducer and the preparation method thereof, and in order to solve the problems that the existing water reducer can lead the concrete fluidity retention rate to be low, the impermeability, the mechanical property and the durability to be poor, the invention adds graphene compounds into the cotton-flax fiber through preparing the modified plant fiber, so that the cotton-flax fiber has certain hydrophilicity, air permeability and adsorptivity, and calcium stearate is adhered and grafted on the surface of the cotton-flax fiber to form a calcium film layer, thereby further improving the antioxidation of the cotton-flax fiber, and simultaneously improving the toughness and the mechanical property; the modified sulfonated starch is prepared, the water reduction rate and the sulfonate substitution degree are in positive corresponding relation within a certain range, the cement is retarded, the space resistance of the sulfonated starch is mainly influenced, the molecular weight influences the performance, the starch is further modified to be degraded, so that the molecular chain is shortened, the viscosity is lowered, and the water reduction effect is better in fluidity; the addition of 1-vinyl-2-pyrrolidone can improve fluidity, and secondly, toughness and durability are improved, so that the use effect of the water reducer is promoted.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the invention provides a high-efficiency environment-friendly water reducer, which comprises the following raw materials in parts by weight:
modified plant fiber: 20-50 parts;
modified sulfonated starch: 10-20 parts;
sodium methallyl sulfonate: 1-20 parts;
n-methyl maleic acid monoamide: 1-10 parts;
aminobenzenesulfonic acid: 1-10 parts;
1-vinyl-2-pyrrolidone: 1-10 parts;
methallyl polyoxyethylene ether: 30-50 parts;
and (3) an initiator: 1-5 parts;
defoaming agent: 1-5 parts.
Preferably, the water reducer comprises the following raw materials in parts by weight:
modified plant fiber: 30-40 parts;
modified sulfonated starch: 12-16 parts;
sodium methallyl sulfonate: 5-15 parts;
n-methyl maleic acid monoamide: 3-7 parts;
aminobenzenesulfonic acid: 4-8 parts;
1-vinyl-2-pyrrolidone: 2-8 parts;
methallyl polyoxyethylene ether: 36-45 parts;
and (3) an initiator: 2-4 parts;
defoaming agent: 2-4 parts.
Further, the modified plant fiber is mainly prepared from the following raw materials in parts by weight:
a graphene compound: 2-5 parts;
cotton-flax fiber: 1-10 parts;
calcium fruit acid: 3-6 parts.
Further, the graphene compound is graphene oxide or graphene, and the cotton-hemp fiber comprises cotton and castor.
Further, the modified sulfonated starch is prepared by taking soluble starch as a raw material, dichloromethane as a solvent and chlorosulfonic acid as a sulfonating agent according to a mass ratio of 2:1:1, and then adding 2g of zinc oxide for grafting reaction, wherein the grafting reaction temperature is 50 ℃, and the grafting reaction time is 2 hours.
Further, the initiator is ammonium persulfate, and the defoamer is emulsified silicone oil.
The invention also provides a preparation method of the high-efficiency environment-friendly water reducer, which comprises the following steps:
step one: preparing modified plant fibers and modified sulfonated starch;
step two: uniformly stirring the product obtained in the step one with other raw materials, then placing the mixture into a reaction kettle for heating, wherein the heating temperature is 100 ℃, and reacting for 2 hours;
step three: and (3) adding alkali into the product of the step two for neutralization, and controlling the pH value to be 7-9 to obtain the high-efficiency environment-friendly water reducer.
The beneficial effects obtained by the method are as follows:
(1) According to the invention, the graphene compound is added into the cotton-flax fiber through the preparation of the modified plant fiber, so that the cotton-flax fiber has certain hydrophilicity, air permeability and adsorptivity, and calcium stearate is adhered and grafted on the surface of the cotton-flax fiber to form a calcium film layer, so that the oxidation resistance of the cotton-flax fiber is further improved, and meanwhile, the toughness is improved, and the mechanical property is improved;
(2) The modified sulfonated starch is prepared, the water reduction rate and the sulfonate substitution degree are in positive corresponding relation within a certain range, the cement is retarded, the space resistance of the sulfonated starch is mainly influenced, the molecular weight influences the performance, the starch is further modified to be degraded, so that the molecular chain is shortened, the viscosity is lowered, and the water reduction effect is better in fluidity;
(3) The addition of the 1-vinyl-2-pyrrolidone can improve the fluidity, and secondly, the toughness and the durability are improved, so that the use effect of the water reducer is promoted;
(4) In addition, the high-efficiency environment-friendly water reducer is simple in preparation method, low in cost and capable of being put into production in a large quantity.
Drawings
FIG. 1 is a scanning electron microscope image of a high-efficiency environment-friendly water reducer prepared in example 2 of the invention.
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the examples of the present invention, unless specifically indicated, the raw materials or treatment techniques are all conventional commercially available raw materials or conventional treatment techniques in the art.
Example 1
The invention provides a high-efficiency environment-friendly water reducing agent, which comprises the following raw materials in parts by weight:
modified plant fiber: 30 parts;
modified sulfonated starch: 12 parts;
sodium methallyl sulfonate: 5 parts;
n-methyl maleic acid monoamide: 3 parts;
aminobenzenesulfonic acid: 4 parts;
1-vinyl-2-pyrrolidone: 2 parts;
methallyl polyoxyethylene ether: 36 parts;
and (3) an initiator: 3 parts;
defoaming agent: 3 parts.
The modified plant fiber is mainly prepared from the following raw materials in parts by weight:
a graphene compound: 2 parts;
cotton-flax fiber: 4 parts;
calcium fruit acid: 5 parts.
Wherein the graphene compound is graphene oxide or graphene, and the cotton and hemp fiber comprises cotton and castor.
The modified sulfonated starch is prepared by taking soluble starch as a raw material, dichloromethane as a solvent and chlorosulfonic acid as a sulfonating agent according to a mass ratio of 2:1:1, and then adding 2g of zinc oxide for grafting reaction, wherein the grafting reaction temperature is 50 ℃, and the grafting reaction time is 2 hours.
Wherein the initiator is ammonium persulfate, and the defoamer is emulsified silicone oil.
The invention also provides a preparation method of the high-efficiency environment-friendly water reducer, which comprises the following steps:
step one: preparing modified plant fibers and modified sulfonated starch;
step two: uniformly stirring the product obtained in the step one with other raw materials, then placing the mixture into a reaction kettle for heating, wherein the heating temperature is 100 ℃, and reacting for 2 hours;
step three: and (3) adding alkali into the product of the step two for neutralization, and controlling the pH value to be 7-9 to obtain the high-efficiency environment-friendly water reducer.
Example 2
The invention provides a high-efficiency environment-friendly water reducing agent, which comprises the following raw materials in parts by weight:
modified plant fiber: 35 parts;
modified sulfonated starch: 14 parts;
sodium methallyl sulfonate: 10 parts;
n-methyl maleic acid monoamide: 5 parts;
aminobenzenesulfonic acid: 6 parts;
1-vinyl-2-pyrrolidone: 5 parts;
methallyl polyoxyethylene ether: 40 parts;
and (3) an initiator: 3 parts;
defoaming agent: 3 parts.
The modified plant fiber is mainly prepared from the following raw materials in parts by weight:
a graphene compound: 4 parts;
cotton-flax fiber: 7 parts;
calcium fruit acid: 5 parts.
Wherein the graphene compound is graphene oxide or graphene, and the cotton and hemp fiber comprises cotton and castor.
The modified sulfonated starch is prepared by taking soluble starch as a raw material, dichloromethane as a solvent and chlorosulfonic acid as a sulfonating agent according to a mass ratio of 2:1:1, and then adding 2g of zinc oxide for grafting reaction, wherein the grafting reaction temperature is 50 ℃, and the grafting reaction time is 2 hours.
Wherein the initiator is ammonium persulfate, and the defoamer is emulsified silicone oil.
Example 3
The invention provides a high-efficiency environment-friendly water reducing agent, which comprises the following raw materials in parts by weight:
modified plant fiber: 40 parts;
modified sulfonated starch: 16 parts;
sodium methallyl sulfonate: 15 parts;
n-methyl maleic acid monoamide: 7 parts;
aminobenzenesulfonic acid: 8 parts;
1-vinyl-2-pyrrolidone: 8 parts;
methallyl polyoxyethylene ether: 45 parts;
and (3) an initiator: 3 parts;
defoaming agent: 3 parts.
The modified plant fiber is mainly prepared from the following raw materials in parts by weight:
a graphene compound: 5 parts;
cotton-flax fiber: 10 parts;
calcium fruit acid: 6 parts.
Wherein the graphene compound is graphene oxide or graphene, and the cotton and hemp fiber comprises cotton and castor.
The modified sulfonated starch is prepared by taking soluble starch as a raw material, dichloromethane as a solvent and chlorosulfonic acid as a sulfonating agent according to a mass ratio of 2:1:1, and then adding 2g of zinc oxide for grafting reaction, wherein the grafting reaction temperature is 50 ℃, and the grafting reaction time is 2 hours.
Wherein the initiator is ammonium persulfate, and the defoamer is emulsified silicone oil.
Comparative example 1
This comparative example provides a high efficiency and environment-friendly water reducing agent and a preparation method thereof, which are different from example 1 only in that the modified plant fiber is not contained in the components, the reduced amount of the modified plant fiber is distributed in the methallyl polyoxyethylene ether, the rest components and the content of the components are the same as those in example 1, and the preparation method is referred to in example 1.
Performance testing
According to GB/T1040-92 standard, testing tensile property, placing in an air conditioning room with the temperature of 80 ℃ and the humidity of 95% for 200 hours, then testing the mechanical property, and testing the water reducing rate by referring to JGJ56-1984 concrete water reducing agent quality standard and concrete water reducing agent experimental method.
Table 1 performance of a high efficiency environmental protection water reducer:
as shown in FIG. 1 and Table 1, the tensile strength and the water reducing rate of the high-efficiency environment-friendly water reducing agent in the embodiment of the invention are obviously higher than those of the comparative example, which shows that the high-efficiency environment-friendly water reducing agent has better water reducing effect, solves the problems of lower fluidity, poor impermeability and mechanical property, and can realize low-cost mass production.
By adopting the preparation method of the high-efficiency environment-friendly water reducer, the tensile strength and the water reducing rate of the embodiment 2 are optimal, the tensile strength reaches 137Mpa, and the water reducing rate reaches 19.9%, so that the introduced materials are required to be added in a certain amount, and the performance is influenced by too much or too little, and the comprehensive influence of the high-efficiency environment-friendly water reducer is considered.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The invention and its embodiments have been described above with no limitation, and the invention is illustrated in the figures of the accompanying drawings as one of its embodiments, without limitation in practice. In summary, if one of ordinary skill in the art is informed by this disclosure, experimental methods and embodiments similar to the technical solution are not creatively designed without departing from the gist of the present invention, and all the experimental methods and embodiments are included in the protection scope of the present invention.
Claims (7)
1. The efficient environment-friendly water reducing agent is characterized by comprising the following raw materials in parts by weight:
modified plant fiber: 20-50 parts;
modified sulfonated starch: 10-20 parts;
sodium methallyl sulfonate: 1-20 parts;
n-methyl maleic acid monoamide: 1-10 parts;
aminobenzenesulfonic acid: 1-10 parts;
1-vinyl-2-pyrrolidone: 1-10 parts;
methallyl polyoxyethylene ether: 30-50 parts;
and (3) an initiator: 1-5 parts;
defoaming agent: 1-5 parts;
the modified plant fiber is mainly prepared from the following raw materials in parts by weight:
a graphene compound: 2-5 parts;
cotton-flax fiber: 1-10 parts;
calcium fruit acid: 3-6 parts;
the graphene compound is graphene oxide or graphene;
the modified sulfonated starch is prepared by taking soluble starch as a raw material, dichloromethane as a solvent and chlorosulfonic acid as a sulfonating agent according to a mass ratio of 2:1:1, and then adding 2g of zinc oxide for grafting reaction.
2. The efficient environment-friendly water reducing agent as defined in claim 1, wherein the water reducing agent comprises the following raw materials in parts by weight:
modified plant fiber: 30-40 parts;
modified sulfonated starch: 12-16 parts;
sodium methallyl sulfonate: 5-15 parts;
n-methyl maleic acid monoamide: 3-7 parts;
aminobenzenesulfonic acid: 4-8 parts;
1-vinyl-2-pyrrolidone: 2-8 parts;
methallyl polyoxyethylene ether: 36-45 parts;
and (3) an initiator: 2-4 parts;
defoaming agent: 2-4 parts.
3. The high-efficiency environment-friendly water reducing agent according to claim 2, which is characterized in that: the cotton and hemp fiber comprises cotton and castor.
4. The high-efficiency environment-friendly water reducing agent according to claim 3, wherein: the grafting reaction temperature is 50 ℃, and the grafting reaction time is 2h.
5. The high-efficiency environment-friendly water reducing agent according to claim 4, which is characterized in that: the initiator is ammonium persulfate.
6. The high-efficiency environment-friendly water reducing agent according to claim 5, which is characterized in that: the defoaming agent is emulsified silicone oil.
7. The method for preparing the high-efficiency environment-friendly water reducing agent according to any one of claims 1 to 6, which is characterized by comprising the following steps:
step one: preparing modified plant fibers and modified sulfonated starch;
step two: uniformly stirring the product obtained in the step one with other raw materials, then placing the mixture into a reaction kettle for heating, wherein the heating temperature is 100 ℃, and reacting for 2 hours;
step three: and (3) adding alkali into the product of the step two for neutralization, and controlling the pH value to be 7-9 to obtain the high-efficiency environment-friendly water reducer.
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